Re: [PATCH v5] NTB: Add IDT 89HPESxNTx PCIe-switches support

From: Jon Mason
Date: Wed Mar 08 2017 - 13:02:51 EST

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On Tue, Mar 07, 2017 at 05:02:38AM +0300, Serge Semin wrote:
> IDT 89HPESxNTx device series is PCIe-switches, which support
> Non-Transparent bridging between domains connected to the device ports.
> Since new NTB API exposes multi-port interface and messaging API, the
> IDT NT-functions can be now supported in the kernel. This driver adds
> the following functionality:
> 1) Multi-port NTB API to have information of possible NT-functions
> activated in compliance with available device ports.
> 2) Memory windows of direct and look up table based address translation
> with all possible combinations of BARs setup.
> 3) Traditional doorbell NTB API.
> 4) One-on-one messaging NTB API.
>
> There are some IDT PCIe-switch setups, which must be done before any of
> the NTB peers started. It can be performed either by system BIOS via
> IDT SMBus-slave interface or by pre-initialized IDT PCIe-switch EEPROM:
> 1) NT-functions of corresponding ports must be activated using
> SWPARTxCTL and SWPORTxCTL registers.
> 2) BAR0 must be configured to expose NT-function configuration
> registers map.
> 3) The rest of the BARs must have at least one memory window
> configured, otherwise the driver will just return an error.
> Temperature sensor of IDT PCIe-switches can be also optionally
> activated by BIOS or EEPROM.
> (See IDT documentations for details of how the pre-initialization can
> be done)
>
> Signed-off-by: Serge Semin <fancer.lancer@xxxxxxxxx>
> Acked-by: Allen Hubbe <Allen.Hubbe@xxxxxxxx>
>
> ---
>
> Changelog v2:
> - Fix minor checkpatch.pl issues
> - Get rid of obfuscating macros
>
> Changelog v3:
> - No write to registers if address is either out of bound or unaligned
> - Fix idt_reg_set_bits()/idt_reg_clear_bits() methods race condition
> - Fix invalid argument of write method called from
> idt_reg_set_bits()/idt_reg_clear_bits() functions
> - Add appropriate naming of function idt_get_mw_size()
> - Fix some documentation notes
> - Replace symbolic permission S_IRUSR with octal 0400
>
> Changelog v4:
> - Return ~0 on read from registers with invalid address
> - Don't check bits validity on registers bits clearing
> - Keep up driver loading (just print a warning) if there is no any peer
> NTBs found
> - Fix unnecessary branching logic
> - Fix some documentation notes
>
> Changelog v5:
> - Fix minor documentation issues
> - Replace writel/readl with iowrite32/ioread32 methods
> - Discard dev_*() wrappers with origins
> - Use pci_alloc_irq_vectors() for IRQ number and ISR initialization
> - Use Mananged Device Resource as much as possible:
> devm_request_threaded_irq(), pcim_iomap_regions_request_all()
>
> drivers/ntb/hw/Kconfig | 1 +
> drivers/ntb/hw/Makefile | 1 +
> drivers/ntb/hw/idt/Kconfig | 31 +
> drivers/ntb/hw/idt/Makefile | 1 +
> drivers/ntb/hw/idt/ntb_hw_idt.c | 2600 +++++++++++++++++++++++++++++++++++++++
> drivers/ntb/hw/idt/ntb_hw_idt.h | 1149 +++++++++++++++++
> 6 files changed, 3783 insertions(+)
> create mode 100644 drivers/ntb/hw/idt/Kconfig
> create mode 100644 drivers/ntb/hw/idt/Makefile
> create mode 100644 drivers/ntb/hw/idt/ntb_hw_idt.c
> create mode 100644 drivers/ntb/hw/idt/ntb_hw_idt.h
>
> diff --git a/drivers/ntb/hw/Kconfig b/drivers/ntb/hw/Kconfig
> index 7116472..a89243c 100644
> --- a/drivers/ntb/hw/Kconfig
> +++ b/drivers/ntb/hw/Kconfig
> @@ -1,2 +1,3 @@
> source "drivers/ntb/hw/amd/Kconfig"
> +source "drivers/ntb/hw/idt/Kconfig"
> source "drivers/ntb/hw/intel/Kconfig"
> diff --git a/drivers/ntb/hw/Makefile b/drivers/ntb/hw/Makefile
> index 532e085..87332c3 100644
> --- a/drivers/ntb/hw/Makefile
> +++ b/drivers/ntb/hw/Makefile
> @@ -1,2 +1,3 @@
> obj-$(CONFIG_NTB_AMD) += amd/
> +obj-$(CONFIG_NTB_IDT) += idt/
> obj-$(CONFIG_NTB_INTEL) += intel/
> diff --git a/drivers/ntb/hw/idt/Kconfig b/drivers/ntb/hw/idt/Kconfig
> new file mode 100644
> index 0000000..b360e56
> --- /dev/null
> +++ b/drivers/ntb/hw/idt/Kconfig
> @@ -0,0 +1,31 @@
> +config NTB_IDT
> + tristate "IDT PCIe-switch Non-Transparent Bridge support"
> + depends on PCI
> + help
> + This driver supports NTB of cappable IDT PCIe-switches.
> +
> + Some of the pre-initializations must be made before IDT PCIe-switch
> + exposes it NT-functions correctly. It should be done by either proper
> + initialisation of EEPROM connected to master smbus of the switch or
> + by BIOS using slave-SMBus interface changing corresponding registers
> + value. Evidently it must be done before PCI bus enumeration is
> + finished in Linux kernel.
> +
> + First of all partitions must be activated and properly assigned to all
> + the ports with NT-functions intended to be activated (see SWPARTxCTL
> + and SWPORTxCTL registers). Then all NT-function BARs must be enabled
> + with chosen valid aperture. For memory windows related BARs the
> + aperture settings shall determine the maximum size of memory windows
> + accepted by a BAR. Note that BAR0 must map PCI configuration space
> + registers.
> +
> + It's worth to note, that since a part of this driver relies on the
> + BAR settings of peer NT-functions, the BAR setups can't be done over
> + kernel PCI fixups. That's why the alternative pre-initialization
> + techniques like BIOS using SMBus interface or EEPROM should be
> + utilized. Additionally if one needs to have temperature sensor
> + information printed to system log, the corresponding registers must
> + be initialized within BIOS/EEPROM as well.
> +
> + If unsure, say N.
> +
> diff --git a/drivers/ntb/hw/idt/Makefile b/drivers/ntb/hw/idt/Makefile
> new file mode 100644
> index 0000000..a102cf1
> --- /dev/null
> +++ b/drivers/ntb/hw/idt/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_NTB_IDT) += ntb_hw_idt.o
> diff --git a/drivers/ntb/hw/idt/ntb_hw_idt.c b/drivers/ntb/hw/idt/ntb_hw_idt.c
> new file mode 100644
> index 0000000..c5d53ee
> --- /dev/null
> +++ b/drivers/ntb/hw/idt/ntb_hw_idt.c
> @@ -0,0 +1,2600 @@
> +/*
> + * This file is provided under a GPLv2 license. When using or
> + * redistributing this file, you may do so under that license.
> + *
> + * GPL LICENSE SUMMARY
> + *
> + * Copyright (C) 2016 T-Platforms All Rights Reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
> + * Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, one can be found http://www.gnu.org/licenses/.
> + *
> + * The full GNU General Public License is included in this distribution in
> + * the file called "COPYING".
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + *
> + * IDT PCIe-switch NTB Linux driver
> + *
> + * Contact Information:
> + * Serge Semin <fancer.lancer@xxxxxxxxx>, <Sergey.Semin@xxxxxxxxxxxxxx>
> + */
> +
> +#include <linux/stddef.h>
> +#include <linux/types.h>
> +#include <linux/kernel.h>
> +#include <linux/bitops.h>
> +#include <linux/sizes.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/spinlock.h>
> +#include <linux/pci.h>
> +#include <linux/aer.h>
> +#include <linux/slab.h>
> +#include <linux/list.h>
> +#include <linux/debugfs.h>
> +#include <linux/ntb.h>
> +
> +#include "ntb_hw_idt.h"
> +
> +#define NTB_NAME "ntb_hw_idt"
> +#define NTB_DESC "IDT PCI-E Non-Transparent Bridge Driver"
> +#define NTB_VER "2.0"
> +#define NTB_IRQNAME "ntb_irq_idt"
> +
> +MODULE_DESCRIPTION(NTB_DESC);
> +MODULE_VERSION(NTB_VER);
> +MODULE_LICENSE("GPL v2");
> +MODULE_AUTHOR("T-platforms");
> +
> +/*
> + * NT Endpoint registers table simplifying a loop access to the functionally
> + * related registers
> + */
> +static const struct idt_ntb_regs ntdata_tbl = {
> + { {IDT_NT_BARSETUP0, IDT_NT_BARLIMIT0,
> + IDT_NT_BARLTBASE0, IDT_NT_BARUTBASE0},
> + {IDT_NT_BARSETUP1, IDT_NT_BARLIMIT1,
> + IDT_NT_BARLTBASE1, IDT_NT_BARUTBASE1},
> + {IDT_NT_BARSETUP2, IDT_NT_BARLIMIT2,
> + IDT_NT_BARLTBASE2, IDT_NT_BARUTBASE2},
> + {IDT_NT_BARSETUP3, IDT_NT_BARLIMIT3,
> + IDT_NT_BARLTBASE3, IDT_NT_BARUTBASE3},
> + {IDT_NT_BARSETUP4, IDT_NT_BARLIMIT4,
> + IDT_NT_BARLTBASE4, IDT_NT_BARUTBASE4},
> + {IDT_NT_BARSETUP5, IDT_NT_BARLIMIT5,
> + IDT_NT_BARLTBASE5, IDT_NT_BARUTBASE5} },
> + { {IDT_NT_INMSG0, IDT_NT_OUTMSG0, IDT_NT_INMSGSRC0},
> + {IDT_NT_INMSG1, IDT_NT_OUTMSG1, IDT_NT_INMSGSRC1},
> + {IDT_NT_INMSG2, IDT_NT_OUTMSG2, IDT_NT_INMSGSRC2},
> + {IDT_NT_INMSG3, IDT_NT_OUTMSG3, IDT_NT_INMSGSRC3} }
> +};
> +
> +/*
> + * NT Endpoint ports data table with the corresponding pcie command, link
> + * status, control and BAR-related registers
> + */
> +static const struct idt_ntb_port portdata_tbl[IDT_MAX_NR_PORTS] = {
> +/*0*/ { IDT_SW_NTP0_PCIECMDSTS, IDT_SW_NTP0_PCIELCTLSTS,
> + IDT_SW_NTP0_NTCTL,
> + IDT_SW_SWPORT0CTL, IDT_SW_SWPORT0STS,
> + { {IDT_SW_NTP0_BARSETUP0, IDT_SW_NTP0_BARLIMIT0,
> + IDT_SW_NTP0_BARLTBASE0, IDT_SW_NTP0_BARUTBASE0},
> + {IDT_SW_NTP0_BARSETUP1, IDT_SW_NTP0_BARLIMIT1,
> + IDT_SW_NTP0_BARLTBASE1, IDT_SW_NTP0_BARUTBASE1},
> + {IDT_SW_NTP0_BARSETUP2, IDT_SW_NTP0_BARLIMIT2,
> + IDT_SW_NTP0_BARLTBASE2, IDT_SW_NTP0_BARUTBASE2},
> + {IDT_SW_NTP0_BARSETUP3, IDT_SW_NTP0_BARLIMIT3,
> + IDT_SW_NTP0_BARLTBASE3, IDT_SW_NTP0_BARUTBASE3},
> + {IDT_SW_NTP0_BARSETUP4, IDT_SW_NTP0_BARLIMIT4,
> + IDT_SW_NTP0_BARLTBASE4, IDT_SW_NTP0_BARUTBASE4},
> + {IDT_SW_NTP0_BARSETUP5, IDT_SW_NTP0_BARLIMIT5,
> + IDT_SW_NTP0_BARLTBASE5, IDT_SW_NTP0_BARUTBASE5} } },
> +/*1*/ {0},
> +/*2*/ { IDT_SW_NTP2_PCIECMDSTS, IDT_SW_NTP2_PCIELCTLSTS,
> + IDT_SW_NTP2_NTCTL,
> + IDT_SW_SWPORT2CTL, IDT_SW_SWPORT2STS,
> + { {IDT_SW_NTP2_BARSETUP0, IDT_SW_NTP2_BARLIMIT0,
> + IDT_SW_NTP2_BARLTBASE0, IDT_SW_NTP2_BARUTBASE0},
> + {IDT_SW_NTP2_BARSETUP1, IDT_SW_NTP2_BARLIMIT1,
> + IDT_SW_NTP2_BARLTBASE1, IDT_SW_NTP2_BARUTBASE1},
> + {IDT_SW_NTP2_BARSETUP2, IDT_SW_NTP2_BARLIMIT2,
> + IDT_SW_NTP2_BARLTBASE2, IDT_SW_NTP2_BARUTBASE2},
> + {IDT_SW_NTP2_BARSETUP3, IDT_SW_NTP2_BARLIMIT3,
> + IDT_SW_NTP2_BARLTBASE3, IDT_SW_NTP2_BARUTBASE3},
> + {IDT_SW_NTP2_BARSETUP4, IDT_SW_NTP2_BARLIMIT4,
> + IDT_SW_NTP2_BARLTBASE4, IDT_SW_NTP2_BARUTBASE4},
> + {IDT_SW_NTP2_BARSETUP5, IDT_SW_NTP2_BARLIMIT5,
> + IDT_SW_NTP2_BARLTBASE5, IDT_SW_NTP2_BARUTBASE5} } },
> +/*3*/ {0},
> +/*4*/ { IDT_SW_NTP4_PCIECMDSTS, IDT_SW_NTP4_PCIELCTLSTS,
> + IDT_SW_NTP4_NTCTL,
> + IDT_SW_SWPORT4CTL, IDT_SW_SWPORT4STS,
> + { {IDT_SW_NTP4_BARSETUP0, IDT_SW_NTP4_BARLIMIT0,
> + IDT_SW_NTP4_BARLTBASE0, IDT_SW_NTP4_BARUTBASE0},
> + {IDT_SW_NTP4_BARSETUP1, IDT_SW_NTP4_BARLIMIT1,
> + IDT_SW_NTP4_BARLTBASE1, IDT_SW_NTP4_BARUTBASE1},
> + {IDT_SW_NTP4_BARSETUP2, IDT_SW_NTP4_BARLIMIT2,
> + IDT_SW_NTP4_BARLTBASE2, IDT_SW_NTP4_BARUTBASE2},
> + {IDT_SW_NTP4_BARSETUP3, IDT_SW_NTP4_BARLIMIT3,
> + IDT_SW_NTP4_BARLTBASE3, IDT_SW_NTP4_BARUTBASE3},
> + {IDT_SW_NTP4_BARSETUP4, IDT_SW_NTP4_BARLIMIT4,
> + IDT_SW_NTP4_BARLTBASE4, IDT_SW_NTP4_BARUTBASE4},
> + {IDT_SW_NTP4_BARSETUP5, IDT_SW_NTP4_BARLIMIT5,
> + IDT_SW_NTP4_BARLTBASE5, IDT_SW_NTP4_BARUTBASE5} } },
> +/*5*/ {0},
> +/*6*/ { IDT_SW_NTP6_PCIECMDSTS, IDT_SW_NTP6_PCIELCTLSTS,
> + IDT_SW_NTP6_NTCTL,
> + IDT_SW_SWPORT6CTL, IDT_SW_SWPORT6STS,
> + { {IDT_SW_NTP6_BARSETUP0, IDT_SW_NTP6_BARLIMIT0,
> + IDT_SW_NTP6_BARLTBASE0, IDT_SW_NTP6_BARUTBASE0},
> + {IDT_SW_NTP6_BARSETUP1, IDT_SW_NTP6_BARLIMIT1,
> + IDT_SW_NTP6_BARLTBASE1, IDT_SW_NTP6_BARUTBASE1},
> + {IDT_SW_NTP6_BARSETUP2, IDT_SW_NTP6_BARLIMIT2,
> + IDT_SW_NTP6_BARLTBASE2, IDT_SW_NTP6_BARUTBASE2},
> + {IDT_SW_NTP6_BARSETUP3, IDT_SW_NTP6_BARLIMIT3,
> + IDT_SW_NTP6_BARLTBASE3, IDT_SW_NTP6_BARUTBASE3},
> + {IDT_SW_NTP6_BARSETUP4, IDT_SW_NTP6_BARLIMIT4,
> + IDT_SW_NTP6_BARLTBASE4, IDT_SW_NTP6_BARUTBASE4},
> + {IDT_SW_NTP6_BARSETUP5, IDT_SW_NTP6_BARLIMIT5,
> + IDT_SW_NTP6_BARLTBASE5, IDT_SW_NTP6_BARUTBASE5} } },
> +/*7*/ {0},
> +/*8*/ { IDT_SW_NTP8_PCIECMDSTS, IDT_SW_NTP8_PCIELCTLSTS,
> + IDT_SW_NTP8_NTCTL,
> + IDT_SW_SWPORT8CTL, IDT_SW_SWPORT8STS,
> + { {IDT_SW_NTP8_BARSETUP0, IDT_SW_NTP8_BARLIMIT0,
> + IDT_SW_NTP8_BARLTBASE0, IDT_SW_NTP8_BARUTBASE0},
> + {IDT_SW_NTP8_BARSETUP1, IDT_SW_NTP8_BARLIMIT1,
> + IDT_SW_NTP8_BARLTBASE1, IDT_SW_NTP8_BARUTBASE1},
> + {IDT_SW_NTP8_BARSETUP2, IDT_SW_NTP8_BARLIMIT2,
> + IDT_SW_NTP8_BARLTBASE2, IDT_SW_NTP8_BARUTBASE2},
> + {IDT_SW_NTP8_BARSETUP3, IDT_SW_NTP8_BARLIMIT3,
> + IDT_SW_NTP8_BARLTBASE3, IDT_SW_NTP8_BARUTBASE3},
> + {IDT_SW_NTP8_BARSETUP4, IDT_SW_NTP8_BARLIMIT4,
> + IDT_SW_NTP8_BARLTBASE4, IDT_SW_NTP8_BARUTBASE4},
> + {IDT_SW_NTP8_BARSETUP5, IDT_SW_NTP8_BARLIMIT5,
> + IDT_SW_NTP8_BARLTBASE5, IDT_SW_NTP8_BARUTBASE5} } },
> +/*9*/ {0},
> +/*10*/ {0},
> +/*11*/ {0},
> +/*12*/ { IDT_SW_NTP12_PCIECMDSTS, IDT_SW_NTP12_PCIELCTLSTS,
> + IDT_SW_NTP12_NTCTL,
> + IDT_SW_SWPORT12CTL, IDT_SW_SWPORT12STS,
> + { {IDT_SW_NTP12_BARSETUP0, IDT_SW_NTP12_BARLIMIT0,
> + IDT_SW_NTP12_BARLTBASE0, IDT_SW_NTP12_BARUTBASE0},
> + {IDT_SW_NTP12_BARSETUP1, IDT_SW_NTP12_BARLIMIT1,
> + IDT_SW_NTP12_BARLTBASE1, IDT_SW_NTP12_BARUTBASE1},
> + {IDT_SW_NTP12_BARSETUP2, IDT_SW_NTP12_BARLIMIT2,
> + IDT_SW_NTP12_BARLTBASE2, IDT_SW_NTP12_BARUTBASE2},
> + {IDT_SW_NTP12_BARSETUP3, IDT_SW_NTP12_BARLIMIT3,
> + IDT_SW_NTP12_BARLTBASE3, IDT_SW_NTP12_BARUTBASE3},
> + {IDT_SW_NTP12_BARSETUP4, IDT_SW_NTP12_BARLIMIT4,
> + IDT_SW_NTP12_BARLTBASE4, IDT_SW_NTP12_BARUTBASE4},
> + {IDT_SW_NTP12_BARSETUP5, IDT_SW_NTP12_BARLIMIT5,
> + IDT_SW_NTP12_BARLTBASE5, IDT_SW_NTP12_BARUTBASE5} } },
> +/*13*/ {0},
> +/*14*/ {0},
> +/*15*/ {0},
> +/*16*/ { IDT_SW_NTP16_PCIECMDSTS, IDT_SW_NTP16_PCIELCTLSTS,
> + IDT_SW_NTP16_NTCTL,
> + IDT_SW_SWPORT16CTL, IDT_SW_SWPORT16STS,
> + { {IDT_SW_NTP16_BARSETUP0, IDT_SW_NTP16_BARLIMIT0,
> + IDT_SW_NTP16_BARLTBASE0, IDT_SW_NTP16_BARUTBASE0},
> + {IDT_SW_NTP16_BARSETUP1, IDT_SW_NTP16_BARLIMIT1,
> + IDT_SW_NTP16_BARLTBASE1, IDT_SW_NTP16_BARUTBASE1},
> + {IDT_SW_NTP16_BARSETUP2, IDT_SW_NTP16_BARLIMIT2,
> + IDT_SW_NTP16_BARLTBASE2, IDT_SW_NTP16_BARUTBASE2},
> + {IDT_SW_NTP16_BARSETUP3, IDT_SW_NTP16_BARLIMIT3,
> + IDT_SW_NTP16_BARLTBASE3, IDT_SW_NTP16_BARUTBASE3},
> + {IDT_SW_NTP16_BARSETUP4, IDT_SW_NTP16_BARLIMIT4,
> + IDT_SW_NTP16_BARLTBASE4, IDT_SW_NTP16_BARUTBASE4},
> + {IDT_SW_NTP16_BARSETUP5, IDT_SW_NTP16_BARLIMIT5,
> + IDT_SW_NTP16_BARLTBASE5, IDT_SW_NTP16_BARUTBASE5} } },
> +/*17*/ {0},
> +/*18*/ {0},
> +/*19*/ {0},
> +/*20*/ { IDT_SW_NTP20_PCIECMDSTS, IDT_SW_NTP20_PCIELCTLSTS,
> + IDT_SW_NTP20_NTCTL,
> + IDT_SW_SWPORT20CTL, IDT_SW_SWPORT20STS,
> + { {IDT_SW_NTP20_BARSETUP0, IDT_SW_NTP20_BARLIMIT0,
> + IDT_SW_NTP20_BARLTBASE0, IDT_SW_NTP20_BARUTBASE0},
> + {IDT_SW_NTP20_BARSETUP1, IDT_SW_NTP20_BARLIMIT1,
> + IDT_SW_NTP20_BARLTBASE1, IDT_SW_NTP20_BARUTBASE1},
> + {IDT_SW_NTP20_BARSETUP2, IDT_SW_NTP20_BARLIMIT2,
> + IDT_SW_NTP20_BARLTBASE2, IDT_SW_NTP20_BARUTBASE2},
> + {IDT_SW_NTP20_BARSETUP3, IDT_SW_NTP20_BARLIMIT3,
> + IDT_SW_NTP20_BARLTBASE3, IDT_SW_NTP20_BARUTBASE3},
> + {IDT_SW_NTP20_BARSETUP4, IDT_SW_NTP20_BARLIMIT4,
> + IDT_SW_NTP20_BARLTBASE4, IDT_SW_NTP20_BARUTBASE4},
> + {IDT_SW_NTP20_BARSETUP5, IDT_SW_NTP20_BARLIMIT5,
> + IDT_SW_NTP20_BARLTBASE5, IDT_SW_NTP20_BARUTBASE5} } },
> +/*21*/ {0},
> +/*22*/ {0},
> +/*23*/ {0}
> +};
> +
> +/*
> + * IDT PCIe-switch partitions table with the corresponding control, status
> + * and messages control registers
> + */
> +static const struct idt_ntb_part partdata_tbl[IDT_MAX_NR_PARTS] = {
> +/*0*/ { IDT_SW_SWPART0CTL, IDT_SW_SWPART0STS,
> + {IDT_SW_SWP0MSGCTL0, IDT_SW_SWP0MSGCTL1,
> + IDT_SW_SWP0MSGCTL2, IDT_SW_SWP0MSGCTL3} },
> +/*1*/ { IDT_SW_SWPART1CTL, IDT_SW_SWPART1STS,
> + {IDT_SW_SWP1MSGCTL0, IDT_SW_SWP1MSGCTL1,
> + IDT_SW_SWP1MSGCTL2, IDT_SW_SWP1MSGCTL3} },
> +/*2*/ { IDT_SW_SWPART2CTL, IDT_SW_SWPART2STS,
> + {IDT_SW_SWP2MSGCTL0, IDT_SW_SWP2MSGCTL1,
> + IDT_SW_SWP2MSGCTL2, IDT_SW_SWP2MSGCTL3} },
> +/*3*/ { IDT_SW_SWPART3CTL, IDT_SW_SWPART3STS,
> + {IDT_SW_SWP3MSGCTL0, IDT_SW_SWP3MSGCTL1,
> + IDT_SW_SWP3MSGCTL2, IDT_SW_SWP3MSGCTL3} },
> +/*4*/ { IDT_SW_SWPART4CTL, IDT_SW_SWPART4STS,
> + {IDT_SW_SWP4MSGCTL0, IDT_SW_SWP4MSGCTL1,
> + IDT_SW_SWP4MSGCTL2, IDT_SW_SWP4MSGCTL3} },
> +/*5*/ { IDT_SW_SWPART5CTL, IDT_SW_SWPART5STS,
> + {IDT_SW_SWP5MSGCTL0, IDT_SW_SWP5MSGCTL1,
> + IDT_SW_SWP5MSGCTL2, IDT_SW_SWP5MSGCTL3} },
> +/*6*/ { IDT_SW_SWPART6CTL, IDT_SW_SWPART6STS,
> + {IDT_SW_SWP6MSGCTL0, IDT_SW_SWP6MSGCTL1,
> + IDT_SW_SWP6MSGCTL2, IDT_SW_SWP6MSGCTL3} },
> +/*7*/ { IDT_SW_SWPART7CTL, IDT_SW_SWPART7STS,
> + {IDT_SW_SWP7MSGCTL0, IDT_SW_SWP7MSGCTL1,
> + IDT_SW_SWP7MSGCTL2, IDT_SW_SWP7MSGCTL3} }
> +};
> +
> +/*
> + * DebugFS directory to place the driver debug file
> + */
> +static struct dentry *dbgfs_topdir;
> +
> +/*=============================================================================
> + * 1. IDT PCIe-switch registers IO-functions
> + *
> + * Beside ordinary configuration space registers IDT PCIe-switch expose
> + * global configuration registers, which are used to determine state of other
> + * device ports as well as being notified of some switch-related events.
> + * Additionally all the configuration space registers of all the IDT
> + * PCIe-switch functions are mapped to the Global Address space, so each
> + * function can determine a configuration of any other PCI-function.
> + * Functions declared in this chapter are created to encapsulate access
> + * to configuration and global registers, so the driver code just need to
> + * provide IDT NTB hardware descriptor and a register address.
> + *=============================================================================
> + */
> +
> +/*
> + * idt_nt_write() - PCI configuration space registers write method
> + * @ndev: IDT NTB hardware driver descriptor
> + * @reg: Register to write data to
> + * @data: Value to write to the register
> + *
> + * IDT PCIe-switch registers are all Little endian.
> + */
> +static void idt_nt_write(struct idt_ntb_dev *ndev,
> + const unsigned int reg, const u32 data)
> +{
> + /*
> + * It's obvious bug to request a register exceeding the maximum possible
> + * value as well as to have it unaligned.
> + */
> + if (WARN_ON(reg > IDT_REG_PCI_MAX || !IS_ALIGNED(reg, IDT_REG_ALIGN)))
> + return;
> +
> + /* Just write the value to the specified register */
> + iowrite32(data, ndev->cfgspc + (ptrdiff_t)reg);
> +}
> +
> +/*
> + * idt_nt_read() - PCI configuration space registers read method
> + * @ndev: IDT NTB hardware driver descriptor
> + * @reg: Register to write data to
> + *
> + * IDT PCIe-switch Global configuration registers are all Little endian.
> + *
> + * Return: register value
> + */
> +static u32 idt_nt_read(struct idt_ntb_dev *ndev, const unsigned int reg)
> +{
> + /*
> + * It's obvious bug to request a register exceeding the maximum possible
> + * value as well as to have it unaligned.
> + */
> + if (WARN_ON(reg > IDT_REG_PCI_MAX || !IS_ALIGNED(reg, IDT_REG_ALIGN)))
> + return ~0;
> +
> + /* Just read the value from the specified register */
> + return ioread32(ndev->cfgspc + (ptrdiff_t)reg);
> +}
> +
> +/*
> + * idt_sw_write() - Global registers write method
> + * @ndev: IDT NTB hardware driver descriptor
> + * @reg: Register to write data to
> + * @data: Value to write to the register
> + *
> + * IDT PCIe-switch Global configuration registers are all Little endian.
> + */
> +static void idt_sw_write(struct idt_ntb_dev *ndev,
> + const unsigned int reg, const u32 data)
> +{
> + unsigned long irqflags;
> +
> + /*
> + * It's obvious bug to request a register exceeding the maximum possible
> + * value as well as to have it unaligned.
> + */
> + if (WARN_ON(reg > IDT_REG_SW_MAX || !IS_ALIGNED(reg, IDT_REG_ALIGN)))
> + return;
> +
> + /* Lock GASA registers operations */
> + spin_lock_irqsave(&ndev->gasa_lock, irqflags);
> + /* Set the global register address */
> + iowrite32((u32)reg, ndev->cfgspc + (ptrdiff_t)IDT_NT_GASAADDR);
> + /* Put the new value of the register */
> + iowrite32(data, ndev->cfgspc + (ptrdiff_t)IDT_NT_GASADATA);
> + /* Unlock GASA registers operations */
> + spin_unlock_irqrestore(&ndev->gasa_lock, irqflags);
> +}
> +
> +/*
> + * idt_sw_read() - Global registers read method
> + * @ndev: IDT NTB hardware driver descriptor
> + * @reg: Register to write data to
> + *
> + * IDT PCIe-switch Global configuration registers are all Little endian.
> + *
> + * Return: register value
> + */
> +static u32 idt_sw_read(struct idt_ntb_dev *ndev, const unsigned int reg)
> +{
> + unsigned long irqflags;
> + u32 data;
> +
> + /*
> + * It's obvious bug to request a register exceeding the maximum possible
> + * value as well as to have it unaligned.
> + */
> + if (WARN_ON(reg > IDT_REG_SW_MAX || !IS_ALIGNED(reg, IDT_REG_ALIGN)))
> + return ~0;
> +
> + /* Lock GASA registers operations */
> + spin_lock_irqsave(&ndev->gasa_lock, irqflags);
> + /* Set the global register address */
> + iowrite32((u32)reg, ndev->cfgspc + (ptrdiff_t)IDT_NT_GASAADDR);
> + /* Get the data of the register */
> + data = ioread32(ndev->cfgspc + (ptrdiff_t)IDT_NT_GASADATA);
> + /* Unlock GASA registers operations */
> + spin_unlock_irqrestore(&ndev->gasa_lock, irqflags);
> +
> + return data;
> +}
> +
> +/*
> + * idt_reg_set_bits() - set bits of a passed register
> + * @ndev: IDT NTB hardware driver descriptor
> + * @reg: Register to change bits of
> + * @reg_lock: Register access spin lock
> + * @valid_mask: Mask of valid bits
> + * @set_bits: Bitmask to set
> + *
> + * Helper method to check whether a passed bitfield is valid and set
> + * corresponding bits of a register.
> + *
> + * WARNING! Make sure the passed register isn't accessed over plane
> + * idt_nt_write() method (read method is ok to be used concurrently).
> + *
> + * Return: zero on success, negative error on invalid bitmask.
> + */
> +static inline int idt_reg_set_bits(struct idt_ntb_dev *ndev, unsigned int reg,
> + spinlock_t *reg_lock,
> + u64 valid_mask, u64 set_bits)
> +{
> + unsigned long irqflags;
> + u32 data;
> +
> + if (set_bits & ~(u64)valid_mask)
> + return -EINVAL;
> +
> + /* Lock access to the register unless the change is written back */
> + spin_lock_irqsave(reg_lock, irqflags);
> + data = idt_nt_read(ndev, reg) | (u32)set_bits;
> + idt_nt_write(ndev, reg, data);
> + /* Unlock the register */
> + spin_unlock_irqrestore(reg_lock, irqflags);
> +
> + return 0;
> +}
> +
> +/*
> + * idt_reg_clear_bits() - clear bits of a passed register
> + * @ndev: IDT NTB hardware driver descriptor
> + * @reg: Register to change bits of
> + * @reg_lock: Register access spin lock
> + * @set_bits: Bitmask to clear
> + *
> + * Helper method to check whether a passed bitfield is valid and clear
> + * corresponding bits of a register.
> + *
> + * NOTE! Invalid bits are always considered cleared so it's not an error
> + * to clear them over.
> + *
> + * WARNING! Make sure the passed register isn't accessed over plane
> + * idt_nt_write() method (read method is ok to use concurrently).
> + */
> +static inline void idt_reg_clear_bits(struct idt_ntb_dev *ndev,
> + unsigned int reg, spinlock_t *reg_lock,
> + u64 clear_bits)
> +{
> + unsigned long irqflags;
> + u32 data;
> +
> + /* Lock access to the register unless the change is written back */
> + spin_lock_irqsave(reg_lock, irqflags);
> + data = idt_nt_read(ndev, reg) & ~(u32)clear_bits;
> + idt_nt_write(ndev, reg, data);
> + /* Unlock the register */
> + spin_unlock_irqrestore(reg_lock, irqflags);
> +}
> +
> +/*===========================================================================
> + * 2. Ports operations
> + *
> + * IDT PCIe-switches can have from 3 up to 8 ports with possible
> + * NT-functions enabled. So all the possible ports need to be scanned looking
> + * for NTB activated. NTB API will have enumerated only the ports with NTB.
> + *===========================================================================
> + */
> +
> +/*
> + * idt_scan_ports() - scan IDT PCIe-switch ports collecting info in the tables
> + * @ndev: Pointer to the PCI device descriptor
> + *
> + * Return: zero on success, otherwise a negative error number.
> + */
> +static int idt_scan_ports(struct idt_ntb_dev *ndev)
> +{
> + unsigned char pidx, port, part;
> + u32 data, portsts, partsts;
> +
> + /* Retrieve the local port number */
> + data = idt_nt_read(ndev, IDT_NT_PCIELCAP);
> + ndev->port = GET_FIELD(PCIELCAP_PORTNUM, data);
> +
> + /* Retrieve the local partition number */
> + portsts = idt_sw_read(ndev, portdata_tbl[ndev->port].sts);
> + ndev->part = GET_FIELD(SWPORTxSTS_SWPART, portsts);
> +
> + /* Initialize port/partition -> index tables with invalid values */
> + memset(ndev->port_idx_map, -EINVAL, sizeof(ndev->port_idx_map));
> + memset(ndev->part_idx_map, -EINVAL, sizeof(ndev->part_idx_map));
> +
> + /*
> + * Walk over all the possible ports checking whether any of them has
> + * NT-function activated
> + */
> + ndev->peer_cnt = 0;
> + for (pidx = 0; pidx < ndev->swcfg->port_cnt; pidx++) {
> + port = ndev->swcfg->ports[pidx];
> + /* Skip local port */
> + if (port == ndev->port)
> + continue;
> +
> + /* Read the port status register to get it partition */
> + portsts = idt_sw_read(ndev, portdata_tbl[port].sts);
> + part = GET_FIELD(SWPORTxSTS_SWPART, portsts);
> +
> + /* Retrieve the partition status */
> + partsts = idt_sw_read(ndev, partdata_tbl[part].sts);
> + /* Check if partition state is active and port has NTB */
> + if (IS_FLD_SET(SWPARTxSTS_STATE, partsts, ACT) &&
> + (IS_FLD_SET(SWPORTxSTS_MODE, portsts, NT) ||
> + IS_FLD_SET(SWPORTxSTS_MODE, portsts, USNT) ||
> + IS_FLD_SET(SWPORTxSTS_MODE, portsts, USNTDMA) ||
> + IS_FLD_SET(SWPORTxSTS_MODE, portsts, NTDMA))) {
> + /* Save the port and partition numbers */
> + ndev->peers[ndev->peer_cnt].port = port;
> + ndev->peers[ndev->peer_cnt].part = part;
> + /* Fill in the port/partition -> index tables */
> + ndev->port_idx_map[port] = ndev->peer_cnt;
> + ndev->part_idx_map[part] = ndev->peer_cnt;
> + ndev->peer_cnt++;
> + }
> + }
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "Local port: %hhu, num of peers: %hhu\n",
> + ndev->port, ndev->peer_cnt);
> +
> + /* It's useless to have this driver loaded if there is no any peer */
> + if (ndev->peer_cnt == 0) {
> + dev_warn(&ndev->ntb.pdev->dev, "No active peer found\n");
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_port_number() - get the local port number
> + * @ntb: NTB device context.
> + *
> + * Return: the local port number
> + */
> +static int idt_ntb_port_number(struct ntb_dev *ntb)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + return ndev->port;
> +}
> +
> +/*
> + * idt_ntb_peer_port_count() - get the number of peer ports
> + * @ntb: NTB device context.
> + *
> + * Return the count of detected peer NT-functions.
> + *
> + * Return: number of peer ports
> + */
> +static int idt_ntb_peer_port_count(struct ntb_dev *ntb)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + return ndev->peer_cnt;
> +}
> +
> +/*
> + * idt_ntb_peer_port_number() - get peer port by given index
> + * @ntb: NTB device context.
> + * @pidx: Peer port index.
> + *
> + * Return: peer port or negative error
> + */
> +static int idt_ntb_peer_port_number(struct ntb_dev *ntb, int pidx)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + if (pidx < 0 || ndev->peer_cnt <= pidx)
> + return -EINVAL;
> +
> + /* Return the detected NT-function port number */
> + return ndev->peers[pidx].port;
> +}
> +
> +/*
> + * idt_ntb_peer_port_idx() - get peer port index by given port number
> + * @ntb: NTB device context.
> + * @port: Peer port number.
> + *
> + * Internal port -> index table is pre-initialized with -EINVAL values,
> + * so we just need to return it value
> + *
> + * Return: peer NT-function port index or negative error
> + */
> +static int idt_ntb_peer_port_idx(struct ntb_dev *ntb, int port)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + if (port < 0 || IDT_MAX_NR_PORTS <= port)
> + return -EINVAL;
> +
> + return ndev->port_idx_map[port];
> +}
> +
> +/*===========================================================================
> + * 3. Link status operations
> + * There is no any ready-to-use method to have peer ports notified if NTB
> + * link is set up or got down. Instead global signal can be used instead.
> + * In case if any one of ports changes local NTB link state, it sends
> + * global signal and clears corresponding global state bit. Then all the ports
> + * receive a notification of that, so to make client driver being aware of
> + * possible NTB link change.
> + * Additionally each of active NT-functions is subscribed to PCIe-link
> + * state changes of peer ports.
> + *===========================================================================
> + */
> +
> +static void idt_ntb_local_link_disable(struct idt_ntb_dev *ndev);
> +
> +/*
> + * idt_init_link() - Initialize NTB link state notification subsystem
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * Function performs the basic initialization of some global registers
> + * needed to enable IRQ-based notifications of PCIe Link Up/Down and
> + * Global Signal events.
> + * NOTE Since it's not possible to determine when all the NTB peer drivers are
> + * unloaded as well as have those registers accessed concurrently, we must
> + * preinitialize them with the same value and leave it uncleared on local
> + * driver unload.
> + */
> +static void idt_init_link(struct idt_ntb_dev *ndev)
> +{
> + u32 part_mask, port_mask, se_mask;
> + unsigned char pidx;
> +
> + /* Initialize spin locker of Mapping Table access registers */
> + spin_lock_init(&ndev->mtbl_lock);
> +
> + /* Walk over all detected peers collecting port and partition masks */
> + port_mask = ~BIT(ndev->port);
> + part_mask = ~BIT(ndev->part);
> + for (pidx = 0; pidx < ndev->peer_cnt; pidx++) {
> + port_mask &= ~BIT(ndev->peers[pidx].port);
> + part_mask &= ~BIT(ndev->peers[pidx].part);
> + }
> +
> + /* Clean the Link Up/Down and GLobal Signal status registers */
> + idt_sw_write(ndev, IDT_SW_SELINKUPSTS, (u32)-1);
> + idt_sw_write(ndev, IDT_SW_SELINKDNSTS, (u32)-1);
> + idt_sw_write(ndev, IDT_SW_SEGSIGSTS, (u32)-1);
> +
> + /* Unmask NT-activated partitions to receive Global Switch events */
> + idt_sw_write(ndev, IDT_SW_SEPMSK, part_mask);
> +
> + /* Enable PCIe Link Up events of NT-activated ports */
> + idt_sw_write(ndev, IDT_SW_SELINKUPMSK, port_mask);
> +
> + /* Enable PCIe Link Down events of NT-activated ports */
> + idt_sw_write(ndev, IDT_SW_SELINKDNMSK, port_mask);
> +
> + /* Unmask NT-activated partitions to receive Global Signal events */
> + idt_sw_write(ndev, IDT_SW_SEGSIGMSK, part_mask);
> +
> + /* Unmask Link Up/Down and Global Switch Events */
> + se_mask = ~(IDT_SEMSK_LINKUP | IDT_SEMSK_LINKDN | IDT_SEMSK_GSIGNAL);
> + idt_sw_write(ndev, IDT_SW_SEMSK, se_mask);
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "NTB link status events initialized");
> +}
> +
> +/*
> + * idt_deinit_link() - deinitialize link subsystem
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * Just disable the link back.
> + */
> +static void idt_deinit_link(struct idt_ntb_dev *ndev)
> +{
> + /* Disable the link */
> + idt_ntb_local_link_disable(ndev);
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "NTB link status events deinitialized");
> +}
> +
> +/*
> + * idt_se_isr() - switch events ISR
> + * @ndev: IDT NTB hardware driver descriptor
> + * @ntint_sts: NT-function interrupt status
> + *
> + * This driver doesn't support IDT PCIe-switch dynamic reconfigurations,
> + * Failover capability, etc, so switch events are utilized to notify of
> + * PCIe and NTB link events.
> + * The method is called from PCIe ISR bottom-half routine.
> + */
> +static void idt_se_isr(struct idt_ntb_dev *ndev, u32 ntint_sts)
> +{
> + u32 sests;
> +
> + /* Read Switch Events status */
> + sests = idt_sw_read(ndev, IDT_SW_SESTS);
> +
> + /* Clean the Link Up/Down and Global Signal status registers */
> + idt_sw_write(ndev, IDT_SW_SELINKUPSTS, (u32)-1);
> + idt_sw_write(ndev, IDT_SW_SELINKDNSTS, (u32)-1);
> + idt_sw_write(ndev, IDT_SW_SEGSIGSTS, (u32)-1);
> +
> + /* Clean the corresponding interrupt bit */
> + idt_nt_write(ndev, IDT_NT_NTINTSTS, IDT_NTINTSTS_SEVENT);
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "SE IRQ detected %#08x (SESTS %#08x)",
> + ntint_sts, sests);
> +
> + /* Notify the client driver of possible link state change */
> + ntb_link_event(&ndev->ntb);
> +}
> +
> +/*
> + * idt_ntb_local_link_enable() - enable the local NTB link.
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * In order to enable the NTB link we need:
> + * - enable Completion TLPs translation
> + * - initialize mapping table to enable the Request ID translation
> + * - notify peers of NTB link state change
> + */
> +static void idt_ntb_local_link_enable(struct idt_ntb_dev *ndev)
> +{
> + u32 reqid, mtbldata = 0;
> + unsigned long irqflags;
> +
> + /* Enable the ID protection and Completion TLPs translation */
> + idt_nt_write(ndev, IDT_NT_NTCTL, IDT_NTCTL_CPEN);
> +
> + /* Retrieve the current Requester ID (Bus:Device:Function) */
> + reqid = idt_nt_read(ndev, IDT_NT_REQIDCAP);
> +
> + /*
> + * Set the corresponding NT Mapping table entry of port partition index
> + * with the data to perform the Request ID translation
> + */
> + mtbldata = SET_FIELD(NTMTBLDATA_REQID, 0, reqid) |
> + SET_FIELD(NTMTBLDATA_PART, 0, ndev->part) |
> + IDT_NTMTBLDATA_VALID;
> + spin_lock_irqsave(&ndev->mtbl_lock, irqflags);
> + idt_nt_write(ndev, IDT_NT_NTMTBLADDR, ndev->part);
> + idt_nt_write(ndev, IDT_NT_NTMTBLDATA, mtbldata);
> + spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags);
> +
> + /* Notify the peers by setting and clearing the global signal bit */
> + idt_nt_write(ndev, IDT_NT_NTGSIGNAL, IDT_NTGSIGNAL_SET);
> + idt_sw_write(ndev, IDT_SW_SEGSIGSTS, (u32)1 << ndev->part);
> +}
> +
> +/*
> + * idt_ntb_local_link_disable() - disable the local NTB link.
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * In order to enable the NTB link we need:
> + * - disable Completion TLPs translation
> + * - clear corresponding mapping table entry
> + * - notify peers of NTB link state change
> + */
> +static void idt_ntb_local_link_disable(struct idt_ntb_dev *ndev)
> +{
> + unsigned long irqflags;
> +
> + /* Disable Completion TLPs translation */
> + idt_nt_write(ndev, IDT_NT_NTCTL, 0);
> +
> + /* Clear the corresponding NT Mapping table entry */
> + spin_lock_irqsave(&ndev->mtbl_lock, irqflags);
> + idt_nt_write(ndev, IDT_NT_NTMTBLADDR, ndev->part);
> + idt_nt_write(ndev, IDT_NT_NTMTBLDATA, 0);
> + spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags);
> +
> + /* Notify the peers by setting and clearing the global signal bit */
> + idt_nt_write(ndev, IDT_NT_NTGSIGNAL, IDT_NTGSIGNAL_SET);
> + idt_sw_write(ndev, IDT_SW_SEGSIGSTS, (u32)1 << ndev->part);
> +}
> +
> +/*
> + * idt_ntb_local_link_is_up() - test wethter local NTB link is up
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * Local link is up under the following conditions:
> + * - Bus mastering is enabled
> + * - NTCTL has Completion TLPs translation enabled
> + * - Mapping table permits Request TLPs translation
> + * NOTE: We don't need to check PCIe link state since it's obviously
> + * up while we are able to communicate with IDT PCIe-switch
> + *
> + * Return: true if link is up, otherwise false
> + */
> +static bool idt_ntb_local_link_is_up(struct idt_ntb_dev *ndev)
> +{
> + unsigned long irqflags;
> + u32 data;
> +
> + /* Read the local Bus Master Enable status */
> + data = idt_nt_read(ndev, IDT_NT_PCICMDSTS);
> + if (!(data & IDT_PCICMDSTS_BME))
> + return false;
> +
> + /* Read the local Completion TLPs translation enable status */
> + data = idt_nt_read(ndev, IDT_NT_NTCTL);
> + if (!(data & IDT_NTCTL_CPEN))
> + return false;
> +
> + /* Read Mapping table entry corresponding to the local partition */
> + spin_lock_irqsave(&ndev->mtbl_lock, irqflags);
> + idt_nt_write(ndev, IDT_NT_NTMTBLADDR, ndev->part);
> + data = idt_nt_read(ndev, IDT_NT_NTMTBLDATA);
> + spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags);
> +
> + return !!(data & IDT_NTMTBLDATA_VALID);
> +}
> +
> +/*
> + * idt_ntb_peer_link_is_up() - test whether peer NTB link is up
> + * @ndev: IDT NTB hardware driver descriptor
> + * @pidx: Peer port index
> + *
> + * Peer link is up under the following conditions:
> + * - PCIe link is up
> + * - Bus mastering is enabled
> + * - NTCTL has Completion TLPs translation enabled
> + * - Mapping table permits Request TLPs translation
> + *
> + * Return: true if link is up, otherwise false
> + */
> +static bool idt_ntb_peer_link_is_up(struct idt_ntb_dev *ndev, int pidx)
> +{
> + unsigned long irqflags;
> + unsigned char port;
> + u32 data;
> +
> + /* Retrieve the device port number */
> + port = ndev->peers[pidx].port;
> +
> + /* Check whether PCIe link is up */
> + data = idt_sw_read(ndev, portdata_tbl[port].sts);
> + if (!(data & IDT_SWPORTxSTS_LINKUP))
> + return false;
> +
> + /* Check whether bus mastering is enabled on the peer port */
> + data = idt_sw_read(ndev, portdata_tbl[port].pcicmdsts);
> + if (!(data & IDT_PCICMDSTS_BME))
> + return false;
> +
> + /* Check if Completion TLPs translation is enabled on the peer port */
> + data = idt_sw_read(ndev, portdata_tbl[port].ntctl);
> + if (!(data & IDT_NTCTL_CPEN))
> + return false;
> +
> + /* Read Mapping table entry corresponding to the peer partition */
> + spin_lock_irqsave(&ndev->mtbl_lock, irqflags);
> + idt_nt_write(ndev, IDT_NT_NTMTBLADDR, ndev->peers[pidx].part);
> + data = idt_nt_read(ndev, IDT_NT_NTMTBLDATA);
> + spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags);
> +
> + return !!(data & IDT_NTMTBLDATA_VALID);
> +}
> +
> +/*
> + * idt_ntb_link_is_up() - get the current ntb link state (NTB API callback)
> + * @ntb: NTB device context.
> + * @speed: OUT - The link speed expressed as PCIe generation number.
> + * @width: OUT - The link width expressed as the number of PCIe lanes.
> + *
> + * Get the bitfield of NTB link states for all peer ports
> + *
> + * Return: bitfield of indexed ports link state: bit is set/cleared if the
> + * link is up/down respectively.
> + */
> +static u64 idt_ntb_link_is_up(struct ntb_dev *ntb,
> + enum ntb_speed *speed, enum ntb_width *width)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> + unsigned char pidx;
> + u64 status;
> + u32 data;
> +
> + /* Retrieve the local link speed and width */
> + if (speed != NULL || width != NULL) {
> + data = idt_nt_read(ndev, IDT_NT_PCIELCTLSTS);
> + if (speed != NULL)
> + *speed = GET_FIELD(PCIELCTLSTS_CLS, data);
> + if (width != NULL)
> + *width = GET_FIELD(PCIELCTLSTS_NLW, data);
> + }
> +
> + /* If local NTB link isn't up then all the links are considered down */
> + if (!idt_ntb_local_link_is_up(ndev))
> + return 0;
> +
> + /* Collect all the peer ports link states into the bitfield */
> + status = 0;
> + for (pidx = 0; pidx < ndev->peer_cnt; pidx++) {
> + if (idt_ntb_peer_link_is_up(ndev, pidx))
> + status |= ((u64)1 << pidx);
> + }
> +
> + return status;
> +}
> +
> +/*
> + * idt_ntb_link_enable() - enable local port ntb link (NTB API callback)
> + * @ntb: NTB device context.
> + * @max_speed: The maximum link speed expressed as PCIe generation number.
> + * @max_width: The maximum link width expressed as the number of PCIe lanes.
> + *
> + * Enable just local NTB link. PCIe link parameters are ignored.
> + *
> + * Return: always zero.
> + */
> +static int idt_ntb_link_enable(struct ntb_dev *ntb, enum ntb_speed speed,
> + enum ntb_width width)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + /* Just enable the local NTB link */
> + idt_ntb_local_link_enable(ndev);
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "Local NTB link enabled");
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_link_disable() - disable local port ntb link (NTB API callback)
> + * @ntb: NTB device context.
> + *
> + * Disable just local NTB link.
> + *
> + * Return: always zero.
> + */
> +static int idt_ntb_link_disable(struct ntb_dev *ntb)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + /* Just disable the local NTB link */
> + idt_ntb_local_link_disable(ndev);
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "Local NTB link disabled");
> +
> + return 0;
> +}
> +
> +/*=============================================================================
> + * 4. Memory Window operations
> + *
> + * IDT PCIe-switches have two types of memory windows: MWs with direct
> + * address translation and MWs with LUT based translation. The first type of
> + * MWs is simple map of corresponding BAR address space to a memory space
> + * of specified target port. So it implemets just ont-to-one mapping. Lookup
> + * table in its turn can map one BAR address space to up to 24 different
> + * memory spaces of different ports.
> + * NT-functions BARs can be turned on to implement either direct or lookup
> + * table based address translations, so:
> + * BAR0 - NT configuration registers space/direct address translation
> + * BAR1 - direct address translation/upper address of BAR0x64
> + * BAR2 - direct address translation/Lookup table with either 12 or 24 entries
> + * BAR3 - direct address translation/upper address of BAR2x64
> + * BAR4 - direct address translation/Lookup table with either 12 or 24 entries
> + * BAR5 - direct address translation/upper address of BAR4x64
> + * Additionally BAR2 and BAR4 can't have 24-entries LUT enabled at the same
> + * time. Since the BARs setup can be rather complicated this driver implements
> + * a scanning algorithm to have all the possible memory windows configuration
> + * covered.
> + *
> + * NOTE 1 BAR setup must be done before Linux kernel enumerated NT-function
> + * of any port, so this driver would have memory windows configurations fixed.
> + * In this way all initializations must be performed either by platform BIOS
> + * or using EEPROM connected to IDT PCIe-switch master SMBus.
> + *
> + * NOTE 2 This driver expects BAR0 mapping NT-function configuration space.
> + * Easy calculation can give us an upper boundary of 29 possible memory windows
> + * per each NT-function if all the BARs are of 32bit type.
> + *=============================================================================
> + */
> +
> +/*
> + * idt_get_mw_count() - get memory window count
> + * @mw_type: Memory window type
> + *
> + * Return: number of memory windows with respect to the BAR type
> + */
> +static inline unsigned char idt_get_mw_count(enum idt_mw_type mw_type)
> +{
> + switch (mw_type) {
> + case IDT_MW_DIR:
> + return 1;
> + case IDT_MW_LUT12:
> + return 12;
> + case IDT_MW_LUT24:
> + return 24;
> + default:
> + break;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * idt_scan_mws() - scan memory windows of the port
> + * @ndev: IDT NTB hardware driver descriptor
> + * @port: Port to get number of memory windows for
> + * @mw_cnt: Out - number of memory windows
> + *
> + * It walks over BAR setup registers of the specified port and determines
> + * the memory windows parameters if any activated.
> + *
> + * Return: array of memory windows
> + */
> +static struct idt_mw_cfg *idt_scan_mws(struct idt_ntb_dev *ndev, int port,
> + unsigned char *mw_cnt)
> +{
> + struct idt_mw_cfg mws[IDT_MAX_NR_MWS], *ret_mws;
> + const struct idt_ntb_bar *bars;
> + enum idt_mw_type mw_type;
> + unsigned char widx, bidx, en_cnt;
> + bool skip_bar;
> + int aprt_size;
> + u32 data;
> +
> + /* Retrieve the array of the BARs registers */
> + bars = portdata_tbl[port].bars;
> +
> + /* Scan all the BARs belonging to the port */
> + *mw_cnt = 0;
> + for (bidx = 0; bidx < IDT_BAR_CNT; bidx += 1 + skip_bar) {
> + /* Read BARSETUP register value */
> + data = idt_sw_read(ndev, bars[bidx].setup);
> +
> + /* Skip disabled BARs */
> + if (!(data & IDT_BARSETUP_EN))
> + continue;
> +
> + /* Skip next BARSETUP if current one has 64bit addressing */
> + skip_bar = IS_FLD_SET(BARSETUP_TYPE, data, 64);

drivers/ntb/hw/idt/ntb_hw_idt.c: In function âidt_scan_mwsâ:
drivers/ntb/hw/idt/ntb_hw_idt.c:1032:42: warning: âskip_barâ may be used uninitialized in this function [-Wmaybe-uninitialized]
for (bidx = 0; bidx < IDT_BAR_CNT; bidx += 1 + skip_bar) {

Also, the name sort of sucks. Perhaps, "64bit_bar" would make it more
obvious what you are doing here.

> +
> + /* Skip configuration space mapping BARs */
> + if (data & IDT_BARSETUP_MODE_CFG)
> + continue;
> +
> + /* Retrieve MW type/entries count and aperture size */
> + mw_type = GET_FIELD(BARSETUP_ATRAN, data);
> + en_cnt = idt_get_mw_count(mw_type);
> + aprt_size = (u64)1 << GET_FIELD(BARSETUP_SIZE, data);
> +
> + /* Save configurations of all available memory windows */
> + for (widx = 0; widx < en_cnt; widx++, (*mw_cnt)++) {
> + /*
> + * IDT can expose a limited number of MWs, so it's bug
> + * to have more than the driver expects
> + */
> + if (*mw_cnt >= IDT_MAX_NR_MWS)
> + return ERR_PTR(-EINVAL);
> +
> + /* Save basic MW info */
> + mws[*mw_cnt].type = mw_type;
> + mws[*mw_cnt].bar = bidx;
> + mws[*mw_cnt].idx = widx;
> + /* It's always DWORD aligned */
> + mws[*mw_cnt].addr_align = IDT_TRANS_ALIGN;
> + /* DIR and LUT approachs differently configure MWs */
> + if (mw_type == IDT_MW_DIR)
> + mws[*mw_cnt].size_max = aprt_size;
> + else if (mw_type == IDT_MW_LUT12)
> + mws[*mw_cnt].size_max = aprt_size / 16;
> + else
> + mws[*mw_cnt].size_max = aprt_size / 32;
> + mws[*mw_cnt].size_align = (mw_type == IDT_MW_DIR) ?
> + IDT_DIR_SIZE_ALIGN : mws[*mw_cnt].size_max;
> + }
> + }
> +
> + /* Allocate memory for memory window descriptors */
> + ret_mws = devm_kcalloc(&ndev->ntb.pdev->dev, *mw_cnt,
> + sizeof(*ret_mws), GFP_KERNEL);
> + if (IS_ERR_OR_NULL(ret_mws))
> + return ERR_PTR(-ENOMEM);
> +
> + /* Copy the info of detected memory windows */
> + memcpy(ret_mws, mws, (*mw_cnt)*sizeof(*ret_mws));
> +
> + return ret_mws;
> +}
> +
> +/*
> + * idt_init_mws() - initialize memory windows subsystem
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * Scan BAR setup registers of local and peer ports to determine the
> + * outbound and inbound memory windows parameters
> + *
> + * Return: zero on success, otherwise a negative error number
> + */
> +static int idt_init_mws(struct idt_ntb_dev *ndev)
> +{
> + struct idt_ntb_peer *peer;
> + unsigned char pidx;
> +
> + /* Scan memory windows of the local port */
> + ndev->mws = idt_scan_mws(ndev, ndev->port, &ndev->mw_cnt);
> + if (IS_ERR(ndev->mws)) {
> + dev_err(&ndev->ntb.pdev->dev,
> + "Failed to scan mws of local port %hhu", ndev->port);
> + return PTR_ERR(ndev->mws);
> + }
> +
> + /* Scan memory windows of the peer ports */
> + for (pidx = 0; pidx < ndev->peer_cnt; pidx++) {
> + peer = &ndev->peers[pidx];
> + peer->mws = idt_scan_mws(ndev, peer->port, &peer->mw_cnt);
> + if (IS_ERR(peer->mws)) {
> + dev_err(&ndev->ntb.pdev->dev,
> + "Failed to scan mws of port %hhu", peer->port);
> + return PTR_ERR(peer->mws);
> + }
> + }
> +
> + /* Initialize spin locker of the LUT registers */
> + spin_lock_init(&ndev->lut_lock);
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "Outbound and inbound MWs initialized");
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_mw_count() - number of inbound memory windows (NTB API callback)
> + * @ntb: NTB device context.
> + * @pidx: Port index of peer device.
> + *
> + * The value is returned for the specified peer, so generally speaking it can
> + * be different for different port depending on the IDT PCIe-switch
> + * initialization.
> + *
> + * Return: the number of memory windows.
> + */
> +static int idt_ntb_mw_count(struct ntb_dev *ntb, int pidx)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + if (pidx < 0 || ndev->peer_cnt <= pidx)
> + return -EINVAL;
> +
> + return ndev->peers[pidx].mw_cnt;
> +}
> +
> +/*
> + * idt_ntb_mw_get_align() - inbound memory window parameters (NTB API callback)
> + * @ntb: NTB device context.
> + * @pidx: Port index of peer device.
> + * @widx: Memory window index.
> + * @addr_align: OUT - the base alignment for translating the memory window
> + * @size_align: OUT - the size alignment for translating the memory window
> + * @size_max: OUT - the maximum size of the memory window
> + *
> + * The peer memory window parameters have already been determined, so just
> + * return the corresponding values, which mustn't change within session.
> + *
> + * Return: Zero on success, otherwise a negative error number.
> + */
> +static int idt_ntb_mw_get_align(struct ntb_dev *ntb, int pidx, int widx,
> + resource_size_t *addr_align,
> + resource_size_t *size_align,
> + resource_size_t *size_max)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> + struct idt_ntb_peer *peer;
> +
> + if (pidx < 0 || ndev->peer_cnt <= pidx)
> + return -EINVAL;
> +
> + peer = &ndev->peers[pidx];
> +
> + if (widx < 0 || peer->mw_cnt <= widx)
> + return -EINVAL;
> +
> + if (addr_align != NULL)
> + *addr_align = peer->mws[widx].addr_align;
> +
> + if (size_align != NULL)
> + *size_align = peer->mws[widx].size_align;
> +
> + if (size_max != NULL)
> + *size_max = peer->mws[widx].size_max;
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_peer_mw_count() - number of outbound memory windows
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + *
> + * Outbound memory windows parameters have been determined based on the
> + * BAR setup registers value, which are mostly constants within one session.
> + *
> + * Return: the number of memory windows.
> + */
> +static int idt_ntb_peer_mw_count(struct ntb_dev *ntb)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + return ndev->mw_cnt;
> +}
> +
> +/*
> + * idt_ntb_peer_mw_get_addr() - get map address of an outbound memory window
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @widx: Memory window index (within ntb_peer_mw_count() return value).
> + * @base: OUT - the base address of mapping region.
> + * @size: OUT - the size of mapping region.
> + *
> + * Return just parameters of BAR resources mapping. Size reflects just the size
> + * of the resource
> + *
> + * Return: Zero on success, otherwise a negative error number.
> + */
> +static int idt_ntb_peer_mw_get_addr(struct ntb_dev *ntb, int widx,
> + phys_addr_t *base, resource_size_t *size)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + if (widx < 0 || ndev->mw_cnt <= widx)
> + return -EINVAL;
> +
> + /* Mapping address is just properly shifted BAR resource start */
> + if (base != NULL)
> + *base = pci_resource_start(ntb->pdev, ndev->mws[widx].bar) +
> + ndev->mws[widx].idx * ndev->mws[widx].size_max;
> +
> + /* Mapping size has already been calculated at MWs scanning */
> + if (size != NULL)
> + *size = ndev->mws[widx].size_max;
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_peer_mw_set_trans() - set a translation address of a memory window
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @pidx: Port index of peer device the translation address received from.
> + * @widx: Memory window index.
> + * @addr: The dma address of the shared memory to access.
> + * @size: The size of the shared memory to access.
> + *
> + * The Direct address translation and LUT base translation is initialized a
> + * bit differenet. Although the parameters restriction are now determined by
> + * the same code.
> + *
> + * Return: Zero on success, otherwise an error number.
> + */
> +static int idt_ntb_peer_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx,
> + u64 addr, resource_size_t size)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> + struct idt_mw_cfg *mw_cfg;
> + u32 data = 0, lutoff = 0;
> +
> + if (pidx < 0 || ndev->peer_cnt <= pidx)
> + return -EINVAL;
> +
> + if (widx < 0 || ndev->mw_cnt <= widx)
> + return -EINVAL;
> +
> + /*
> + * Retrieve the memory window config to make sure the passed arguments
> + * fit it restrictions
> + */
> + mw_cfg = &ndev->mws[widx];
> + if (!IS_ALIGNED(addr, mw_cfg->addr_align))
> + return -EINVAL;
> + if (!IS_ALIGNED(size, mw_cfg->size_align) || size > mw_cfg->size_max)
> + return -EINVAL;
> +
> + /* DIR and LUT based translations are initialized differently */
> + if (mw_cfg->type == IDT_MW_DIR) {
> + const struct idt_ntb_bar *bar = &ntdata_tbl.bars[mw_cfg->bar];
> + u64 limit;
> + /* Set destination partition of translation */
> + data = idt_nt_read(ndev, bar->setup);
> + data = SET_FIELD(BARSETUP_TPART, data, ndev->peers[pidx].part);
> + idt_nt_write(ndev, bar->setup, data);
> + /* Set translation base address */
> + idt_nt_write(ndev, bar->ltbase, (u32)addr);
> + idt_nt_write(ndev, bar->utbase, (u32)(addr >> 32));
> + /* Set the custom BAR aperture limit */
> + limit = pci_resource_start(ntb->pdev, mw_cfg->bar) + size;
> + idt_nt_write(ndev, bar->limit, (u32)limit);
> + if (IS_FLD_SET(BARSETUP_TYPE, data, 64))
> + idt_nt_write(ndev, (bar + 1)->limit, (limit >> 32));
> + } else {
> + unsigned long irqflags;
> + /* Initialize corresponding LUT entry */
> + lutoff = SET_FIELD(LUTOFFSET_INDEX, 0, mw_cfg->idx) |
> + SET_FIELD(LUTOFFSET_BAR, 0, mw_cfg->bar);
> + data = SET_FIELD(LUTUDATA_PART, 0, ndev->peers[pidx].part) |
> + IDT_LUTUDATA_VALID;
> + spin_lock_irqsave(&ndev->lut_lock, irqflags);
> + idt_nt_write(ndev, IDT_NT_LUTOFFSET, lutoff);
> + idt_nt_write(ndev, IDT_NT_LUTLDATA, (u32)addr);
> + idt_nt_write(ndev, IDT_NT_LUTMDATA, (u32)(addr >> 32));
> + idt_nt_write(ndev, IDT_NT_LUTUDATA, data);
> + spin_unlock_irqrestore(&ndev->lut_lock, irqflags);
> + /* Limit address isn't specified since size is fixed for LUT */
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_peer_mw_clear_trans() - clear the outbound MW translation address
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @pidx: Port index of peer device.
> + * @widx: Memory window index.
> + *
> + * It effectively disables the translation over the specified outbound MW.
> + *
> + * Return: Zero on success, otherwise an error number.
> + */
> +static int idt_ntb_peer_mw_clear_trans(struct ntb_dev *ntb, int pidx,
> + int widx)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> + struct idt_mw_cfg *mw_cfg;
> +
> + if (pidx < 0 || ndev->peer_cnt <= pidx)
> + return -EINVAL;
> +
> + if (widx < 0 || ndev->mw_cnt <= widx)
> + return -EINVAL;
> +
> + mw_cfg = &ndev->mws[widx];
> +
> + /* DIR and LUT based translations are initialized differently */
> + if (mw_cfg->type == IDT_MW_DIR) {
> + const struct idt_ntb_bar *bar = &ntdata_tbl.bars[mw_cfg->bar];
> + u32 data;
> + /* Read BARSETUP to check BAR type */
> + data = idt_nt_read(ndev, bar->setup);
> + /* Disable translation by specifying zero BAR limit */
> + idt_nt_write(ndev, bar->limit, 0);
> + if (IS_FLD_SET(BARSETUP_TYPE, data, 64))
> + idt_nt_write(ndev, (bar + 1)->limit, 0);
> + } else {
> + unsigned long irqflags;
> + u32 lutoff;
> + /* Clear the corresponding LUT entry up */
> + lutoff = SET_FIELD(LUTOFFSET_INDEX, 0, mw_cfg->idx) |
> + SET_FIELD(LUTOFFSET_BAR, 0, mw_cfg->bar);
> + spin_lock_irqsave(&ndev->lut_lock, irqflags);
> + idt_nt_write(ndev, IDT_NT_LUTOFFSET, lutoff);
> + idt_nt_write(ndev, IDT_NT_LUTLDATA, 0);
> + idt_nt_write(ndev, IDT_NT_LUTMDATA, 0);
> + idt_nt_write(ndev, IDT_NT_LUTUDATA, 0);
> + spin_unlock_irqrestore(&ndev->lut_lock, irqflags);
> + }
> +
> + return 0;
> +}
> +
> +/*=============================================================================
> + * 5. Doorbell operations
> + *
> + * Doorbell functionality of IDT PCIe-switches is pretty unusual. First of
> + * all there is global doorbell register which state can by changed by any
> + * NT-function of the IDT device in accordance with global permissions. These
> + * permissions configs are not supported by NTB API, so it must be done by
> + * either BIOS or EEPROM settings. In the same way the state of the global
> + * doorbell is reflected to the NT-functions local inbound doorbell registers.
> + * It can lead to situations when client driver sets some peer doorbell bits
> + * and get them bounced back to local inbound doorbell if permissions are
> + * granted.
> + * Secondly there is just one IRQ vector for Doorbell, Message, Temperature
> + * and Switch events, so if client driver left any of Doorbell bits set and
> + * some other event occurred, the driver will be notified of Doorbell event
> + * again.
> + *=============================================================================
> + */
> +
> +/*
> + * idt_db_isr() - doorbell event ISR
> + * @ndev: IDT NTB hardware driver descriptor
> + * @ntint_sts: NT-function interrupt status
> + *
> + * Doorbell event happans when DBELL bit of NTINTSTS switches from 0 to 1.
> + * It happens only when unmasked doorbell bits are set to ones on completely
> + * zeroed doorbell register.
> + * The method is called from PCIe ISR bottom-half routine.
> + */
> +static void idt_db_isr(struct idt_ntb_dev *ndev, u32 ntint_sts)
> +{
> + /*
> + * Doorbell IRQ status will be cleaned only when client
> + * driver unsets all the doorbell bits.
> + */
> + dev_dbg(&ndev->ntb.pdev->dev, "DB IRQ detected %#08x", ntint_sts);
> +
> + /* Notify the client driver of possible doorbell state change */
> + ntb_db_event(&ndev->ntb, 0);
> +}
> +
> +/*
> + * idt_ntb_db_valid_mask() - get a mask of doorbell bits supported by the ntb
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + *
> + * IDT PCIe-switches expose just one Doorbell register of DWORD size.
> + *
> + * Return: A mask of doorbell bits supported by the ntb.
> + */
> +static u64 idt_ntb_db_valid_mask(struct ntb_dev *ntb)
> +{
> + return IDT_DBELL_MASK;
> +}
> +
> +/*
> + * idt_ntb_db_read() - read the local doorbell register (NTB API callback)
> + * @ntb: NTB device context.
> + *
> + * There is just on inbound doorbell register of each NT-function, so
> + * this method return it value.
> + *
> + * Return: The bits currently set in the local doorbell register.
> + */
> +static u64 idt_ntb_db_read(struct ntb_dev *ntb)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + return idt_nt_read(ndev, IDT_NT_INDBELLSTS);
> +}
> +
> +/*
> + * idt_ntb_db_clear() - clear bits in the local doorbell register
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @db_bits: Doorbell bits to clear.
> + *
> + * Clear bits of inbound doorbell register by writing ones to it.
> + *
> + * NOTE! Invalid bits are always considered cleared so it's not an error
> + * to clear them over.
> + *
> + * Return: always zero as success.
> + */
> +static int idt_ntb_db_clear(struct ntb_dev *ntb, u64 db_bits)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + idt_nt_write(ndev, IDT_NT_INDBELLSTS, (u32)db_bits);
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_db_read_mask() - read the local doorbell mask (NTB API callback)
> + * @ntb: NTB device context.
> + *
> + * Each inbound doorbell bit can be masked from generating IRQ by setting
> + * the corresponding bit in inbound doorbell mask. So this method returns
> + * the value of the register.
> + *
> + * Return: The bits currently set in the local doorbell mask register.
> + */
> +static u64 idt_ntb_db_read_mask(struct ntb_dev *ntb)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + return idt_nt_read(ndev, IDT_NT_INDBELLMSK);
> +}
> +
> +/*
> + * idt_ntb_db_set_mask() - set bits in the local doorbell mask
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @db_bits: Doorbell mask bits to set.
> + *
> + * The inbound doorbell register mask value must be read, then OR'ed with
> + * passed field and only then set back.
> + *
> + * Return: zero on success, negative error if invalid argument passed.
> + */
> +static int idt_ntb_db_set_mask(struct ntb_dev *ntb, u64 db_bits)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + return idt_reg_set_bits(ndev, IDT_NT_INDBELLMSK, &ndev->db_mask_lock,
> + IDT_DBELL_MASK, db_bits);
> +}
> +
> +/*
> + * idt_ntb_db_clear_mask() - clear bits in the local doorbell mask
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @db_bits: Doorbell bits to clear.
> + *
> + * The method just clears the set bits up in accordance with the passed
> + * bitfield. IDT PCIe-switch shall generate an interrupt if there hasn't
> + * been any unmasked bit set before current unmasking. Otherwise IRQ won't
> + * be generated since there is only one IRQ vector for all doorbells.
> + *
> + * Return: always zero as success
> + */
> +static int idt_ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + idt_reg_clear_bits(ndev, IDT_NT_INDBELLMSK, &ndev->db_mask_lock,
> + db_bits);
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_peer_db_set() - set bits in the peer doorbell register
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @db_bits: Doorbell bits to set.
> + *
> + * IDT PCIe-switches exposes local outbound doorbell register to change peer
> + * inbound doorbell register state.
> + *
> + * Return: zero on success, negative error if invalid argument passed.
> + */
> +static int idt_ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + if (db_bits & ~(u64)IDT_DBELL_MASK)
> + return -EINVAL;
> +
> + idt_nt_write(ndev, IDT_NT_OUTDBELLSET, (u32)db_bits);
> + return 0;
> +}
> +
> +/*=============================================================================
> + * 6. Messaging operations
> + *
> + * Each NT-function of IDT PCIe-switch has four inbound and four outbound
> + * message registers. Each outbound message register can be connected to one or
> + * even more than one peer inbound message registers by setting global
> + * configurations. Since NTB API permits one-on-one message registers mapping
> + * only, the driver acts in according with that restriction.
> + *=============================================================================
> + */
> +
> +/*
> + * idt_init_msg() - initialize messaging interface
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * Just initialize the message registers routing tables locker.
> + */
> +static void idt_init_msg(struct idt_ntb_dev *ndev)
> +{
> + unsigned char midx;
> +
> + /* Init the messages routing table lockers */
> + for (midx = 0; midx < IDT_MSG_CNT; midx++)
> + spin_lock_init(&ndev->msg_locks[midx]);
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "NTB Messaging initialized");
> +}
> +
> +/*
> + * idt_msg_isr() - message event ISR
> + * @ndev: IDT NTB hardware driver descriptor
> + * @ntint_sts: NT-function interrupt status
> + *
> + * Message event happens when MSG bit of NTINTSTS switches from 0 to 1.
> + * It happens only when unmasked message status bits are set to ones on
> + * completely zeroed message status register.
> + * The method is called from PCIe ISR bottom-half routine.
> + */
> +static void idt_msg_isr(struct idt_ntb_dev *ndev, u32 ntint_sts)
> +{
> + /*
> + * Message IRQ status will be cleaned only when client
> + * driver unsets all the message status bits.
> + */
> + dev_dbg(&ndev->ntb.pdev->dev, "Message IRQ detected %#08x", ntint_sts);
> +
> + /* Notify the client driver of possible message status change */
> + ntb_msg_event(&ndev->ntb);
> +}
> +
> +/*
> + * idt_ntb_msg_count() - get the number of message registers (NTB API callback)
> + * @ntb: NTB device context.
> + *
> + * IDT PCIe-switches support four message registers.
> + *
> + * Return: the number of message registers.
> + */
> +static int idt_ntb_msg_count(struct ntb_dev *ntb)
> +{
> + return IDT_MSG_CNT;
> +}
> +
> +/*
> + * idt_ntb_msg_inbits() - get a bitfield of inbound message registers status
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + *
> + * NT message status register is shared between inbound and outbound message
> + * registers status
> + *
> + * Return: bitfield of inbound message registers.
> + */
> +static u64 idt_ntb_msg_inbits(struct ntb_dev *ntb)
> +{
> + return (u64)IDT_INMSG_MASK;
> +}
> +
> +/*
> + * idt_ntb_msg_outbits() - get a bitfield of outbound message registers status
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + *
> + * NT message status register is shared between inbound and outbound message
> + * registers status
> + *
> + * Return: bitfield of outbound message registers.
> + */
> +static u64 idt_ntb_msg_outbits(struct ntb_dev *ntb)
> +{
> + return (u64)IDT_OUTMSG_MASK;
> +}
> +
> +/*
> + * idt_ntb_msg_read_sts() - read the message registers status (NTB API callback)
> + * @ntb: NTB device context.
> + *
> + * IDT PCIe-switches expose message status registers to notify drivers of
> + * incoming data and failures in case if peer message register isn't freed.
> + *
> + * Return: status bits of message registers
> + */
> +static u64 idt_ntb_msg_read_sts(struct ntb_dev *ntb)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + return idt_nt_read(ndev, IDT_NT_MSGSTS);
> +}
> +
> +/*
> + * idt_ntb_msg_clear_sts() - clear status bits of message registers
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @sts_bits: Status bits to clear.
> + *
> + * Clear bits in the status register by writing ones.
> + *
> + * NOTE! Invalid bits are always considered cleared so it's not an error
> + * to clear them over.
> + *
> + * Return: always zero as success.
> + */
> +static int idt_ntb_msg_clear_sts(struct ntb_dev *ntb, u64 sts_bits)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + idt_nt_write(ndev, IDT_NT_MSGSTS, sts_bits);
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_msg_set_mask() - set mask of message register status bits
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @mask_bits: Mask bits.
> + *
> + * Mask the message status bits from raising an IRQ.
> + *
> + * Return: zero on success, negative error if invalid argument passed.
> + */
> +static int idt_ntb_msg_set_mask(struct ntb_dev *ntb, u64 mask_bits)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + return idt_reg_set_bits(ndev, IDT_NT_MSGSTSMSK, &ndev->msg_mask_lock,
> + IDT_MSG_MASK, mask_bits);
> +}
> +
> +/*
> + * idt_ntb_msg_clear_mask() - clear message registers mask
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @mask_bits: Mask bits.
> + *
> + * Clear mask of message status bits IRQs.
> + *
> + * Return: always zero as success.
> + */
> +static int idt_ntb_msg_clear_mask(struct ntb_dev *ntb, u64 mask_bits)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + idt_reg_clear_bits(ndev, IDT_NT_MSGSTSMSK, &ndev->msg_mask_lock,
> + mask_bits);
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_msg_read() - read message register with specified index
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @midx: Message register index
> + * @pidx: OUT - Port index of peer device a message retrieved from
> + * @msg: OUT - Data
> + *
> + * Read data from the specified message register and source register.
> + *
> + * Return: zero on success, negative error if invalid argument passed.
> + */
> +static int idt_ntb_msg_read(struct ntb_dev *ntb, int midx, int *pidx, u32 *msg)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> +
> + if (midx < 0 || IDT_MSG_CNT <= midx)
> + return -EINVAL;
> +
> + /* Retrieve source port index of the message */
> + if (pidx != NULL) {
> + u32 srcpart;
> +
> + srcpart = idt_nt_read(ndev, ntdata_tbl.msgs[midx].src);
> + *pidx = ndev->part_idx_map[srcpart];
> + }
> +
> + /* Retrieve data of the corresponding message register */
> + if (msg != NULL)
> + *msg = idt_nt_read(ndev, ntdata_tbl.msgs[midx].in);
> +
> + return 0;
> +}
> +
> +/*
> + * idt_ntb_msg_write() - write data to the specified message register
> + * (NTB API callback)
> + * @ntb: NTB device context.
> + * @midx: Message register index
> + * @pidx: Port index of peer device a message being sent to
> + * @msg: Data to send
> + *
> + * Just try to send data to a peer. Message status register should be
> + * checked by client driver.
> + *
> + * Return: zero on success, negative error if invalid argument passed.
> + */
> +static int idt_ntb_msg_write(struct ntb_dev *ntb, int midx, int pidx, u32 msg)
> +{
> + struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
> + unsigned long irqflags;
> + u32 swpmsgctl = 0;
> +
> + if (midx < 0 || IDT_MSG_CNT <= midx)
> + return -EINVAL;
> +
> + if (pidx < 0 || ndev->peer_cnt <= pidx)
> + return -EINVAL;
> +
> + /* Collect the routing information */
> + swpmsgctl = SET_FIELD(SWPxMSGCTL_REG, 0, midx) |
> + SET_FIELD(SWPxMSGCTL_PART, 0, ndev->peers[pidx].part);
> +
> + /* Lock the messages routing table of the specified register */
> + spin_lock_irqsave(&ndev->msg_locks[midx], irqflags);
> + /* Set the route and send the data */
> + idt_sw_write(ndev, partdata_tbl[ndev->part].msgctl[midx], swpmsgctl);
> + idt_nt_write(ndev, ntdata_tbl.msgs[midx].out, msg);
> + /* Unlock the messages routing table */
> + spin_unlock_irqrestore(&ndev->msg_locks[midx], irqflags);
> +
> + /* Client driver shall check the status register */
> + return 0;
> +}
> +
> +/*=============================================================================
> + * 7. Temperature sensor operations
> + *
> + * IDT PCIe-switch has an embedded temperature sensor, which can be used to
> + * warn a user-space of possible chip overheating. Since workload temperature
> + * can be different on different platforms, temperature thresholds as well as
> + * general sensor settings must be setup in the framework of BIOS/EEPROM
> + * initializations. It includes the actual sensor enabling as well.
> + *=============================================================================
> + */
> +
> +/*
> + * idt_read_temp() - read temperature from chip sensor
> + * @ntb: NTB device context.
> + * @val: OUT - integer value of temperature
> + * @frac: OUT - fraction
> + */
> +static void idt_read_temp(struct idt_ntb_dev *ndev, unsigned char *val,
> + unsigned char *frac)
> +{
> + u32 data;
> +
> + /* Read the data from TEMP field of the TMPSTS register */
> + data = idt_sw_read(ndev, IDT_SW_TMPSTS);
> + data = GET_FIELD(TMPSTS_TEMP, data);
> + /* TEMP field has one fractional bit and seven integer bits */
> + *val = data >> 1;
> + *frac = ((data & 0x1) ? 5 : 0);
> +}
> +
> +/*
> + * idt_temp_isr() - temperature sensor alarm events ISR
> + * @ndev: IDT NTB hardware driver descriptor
> + * @ntint_sts: NT-function interrupt status
> + *
> + * It handles events of temperature crossing alarm thresholds. Since reading
> + * of TMPALARM register clears it up, the function doesn't analyze the
> + * read value, instead the current temperature value just warningly printed to
> + * log.
> + * The method is called from PCIe ISR bottom-half routine.
> + */
> +static void idt_temp_isr(struct idt_ntb_dev *ndev, u32 ntint_sts)
> +{
> + unsigned char val, frac;
> +
> + /* Read the current temperature value */
> + idt_read_temp(ndev, &val, &frac);
> +
> + /* Read the temperature alarm to clean the alarm status out */
> + /*(void)idt_sw_read(ndev, IDT_SW_TMPALARM);*/
> +
> + /* Clean the corresponding interrupt bit */
> + idt_nt_write(ndev, IDT_NT_NTINTSTS, IDT_NTINTSTS_TMPSENSOR);
> +
> + dev_dbg(&ndev->ntb.pdev->dev,
> + "Temp sensor IRQ detected %#08x", ntint_sts);
> +
> + /* Print temperature value to log */
> + dev_warn(&ndev->ntb.pdev->dev, "Temperature %hhu.%hhu", val, frac);
> +}
> +
> +/*=============================================================================
> + * 8. ISRs related operations
> + *
> + * IDT PCIe-switch has strangely developed IRQ system. There is just one
> + * interrupt vector for doorbell and message registers. So the hardware driver
> + * can't determine actual source of IRQ if, for example, message event happened
> + * while any of unmasked doorbell is still set. The similar situation may be if
> + * switch or temperature sensor events pop up. The difference is that SEVENT
> + * and TMPSENSOR bits of NT interrupt status register can be cleaned by
> + * IRQ handler so a next interrupt request won't have false handling of
> + * corresponding events.
> + * The hardware driver has only bottom-half handler of the IRQ, since if any
> + * of events happened the device won't raise it again before the last one is
> + * handled by clearing of corresponding NTINTSTS bit.
> + *=============================================================================
> + */
> +
> +static irqreturn_t idt_thread_isr(int irq, void *devid);
> +
> +/*
> + * idt_init_isr() - initialize PCIe interrupt handler
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * Return: zero on success, otherwise a negative error number.
> + */
> +static int idt_init_isr(struct idt_ntb_dev *ndev)
> +{
> + struct pci_dev *pdev = ndev->ntb.pdev;
> + u32 ntint_mask;
> + int ret;
> +
> + /* Allocate just one interrupt vector for the ISR */
> + ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI | PCI_IRQ_LEGACY);
> + if (ret != 1) {
> + dev_err(&pdev->dev, "Failed to allocate IRQ vector");
> + return ret;
> + }
> +
> + /* Retrieve the IRQ vector */
> + ret = pci_irq_vector(pdev, 0);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "Failed to get IRQ vector");
> + goto err_free_vectors;
> + }
> +
> + /* Set the IRQ handler */
> + ret = devm_request_threaded_irq(&pdev->dev, ret, NULL, idt_thread_isr,
> + IRQF_ONESHOT, NTB_IRQNAME, ndev);
> + if (ret != 0) {
> + dev_err(&pdev->dev, "Failed to set MSI IRQ handler, %d", ret);
> + goto err_free_vectors;
> + }
> +
> + /* Unmask Message/Doorbell/SE/Temperature interrupts */
> + ntint_mask = idt_nt_read(ndev, IDT_NT_NTINTMSK) & ~IDT_NTINTMSK_ALL;
> + idt_nt_write(ndev, IDT_NT_NTINTMSK, ntint_mask);
> +
> + /* From now on the interrupts are enabled */
> + dev_dbg(&pdev->dev, "NTB interrupts initialized");
> +
> + return 0;
> +
> +err_free_vectors:
> + pci_free_irq_vectors(pdev);
> +
> + return ret;
> +}
> +
> +
> +/*
> + * idt_deinit_ist() - deinitialize PCIe interrupt handler
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * Disable corresponding interrupts and free allocated IRQ vectors.
> + */
> +static void idt_deinit_isr(struct idt_ntb_dev *ndev)
> +{
> + struct pci_dev *pdev = ndev->ntb.pdev;
> + u32 ntint_mask;
> +
> + /* Mask interrupts back */
> + ntint_mask = idt_nt_read(ndev, IDT_NT_NTINTMSK) | IDT_NTINTMSK_ALL;
> + idt_nt_write(ndev, IDT_NT_NTINTMSK, ntint_mask);
> +
> + /* Free allocated IRQ vectors */
> + pci_free_irq_vectors(pdev);
> +
> + dev_dbg(&pdev->dev, "NTB interrupts deinitialized");
> +}
> +
> +/*
> + * idt_thread_isr() - NT function interrupts handler
> + * @irq: IRQ number
> + * @devid: Custom buffer
> + *
> + * It reads current NT interrupts state register and handles all the event
> + * it declares.
> + * The method is bottom-half routine of actual default PCIe IRQ handler.
> + */
> +static irqreturn_t idt_thread_isr(int irq, void *devid)
> +{
> + struct idt_ntb_dev *ndev = devid;
> + bool handled = false;
> + u32 ntint_sts;
> +
> + /* Read the NT interrupts status register */
> + ntint_sts = idt_nt_read(ndev, IDT_NT_NTINTSTS);
> +
> + /* Handle messaging interrupts */
> + if (ntint_sts & IDT_NTINTSTS_MSG) {
> + idt_msg_isr(ndev, ntint_sts);
> + handled = true;
> + }
> +
> + /* Handle doorbell interrupts */
> + if (ntint_sts & IDT_NTINTSTS_DBELL) {
> + idt_db_isr(ndev, ntint_sts);
> + handled = true;
> + }
> +
> + /* Handle switch event interrupts */
> + if (ntint_sts & IDT_NTINTSTS_SEVENT) {
> + idt_se_isr(ndev, ntint_sts);
> + handled = true;
> + }
> +
> + /* Handle temperature sensor interrupt */
> + if (ntint_sts & IDT_NTINTSTS_TMPSENSOR) {
> + idt_temp_isr(ndev, ntint_sts);
> + handled = true;
> + }
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "IDT IRQs 0x%08x handled", ntint_sts);
> +
> + return handled ? IRQ_HANDLED : IRQ_NONE;
> +}
> +
> +/*===========================================================================
> + * 9. NTB hardware driver initialization
> + *===========================================================================
> + */
> +
> +/*
> + * NTB API operations
> + */
> +static const struct ntb_dev_ops idt_ntb_ops = {
> + .port_number = idt_ntb_port_number,
> + .peer_port_count = idt_ntb_peer_port_count,
> + .peer_port_number = idt_ntb_peer_port_number,
> + .peer_port_idx = idt_ntb_peer_port_idx,
> + .link_is_up = idt_ntb_link_is_up,
> + .link_enable = idt_ntb_link_enable,
> + .link_disable = idt_ntb_link_disable,
> + .mw_count = idt_ntb_mw_count,
> + .mw_get_align = idt_ntb_mw_get_align,
> + .peer_mw_count = idt_ntb_peer_mw_count,
> + .peer_mw_get_addr = idt_ntb_peer_mw_get_addr,
> + .peer_mw_set_trans = idt_ntb_peer_mw_set_trans,
> + .peer_mw_clear_trans = idt_ntb_peer_mw_clear_trans,
> + .db_valid_mask = idt_ntb_db_valid_mask,
> + .db_read = idt_ntb_db_read,
> + .db_clear = idt_ntb_db_clear,
> + .db_read_mask = idt_ntb_db_read_mask,
> + .db_set_mask = idt_ntb_db_set_mask,
> + .db_clear_mask = idt_ntb_db_clear_mask,
> + .peer_db_set = idt_ntb_peer_db_set,
> + .msg_count = idt_ntb_msg_count,
> + .msg_inbits = idt_ntb_msg_inbits,
> + .msg_outbits = idt_ntb_msg_outbits,
> + .msg_read_sts = idt_ntb_msg_read_sts,
> + .msg_clear_sts = idt_ntb_msg_clear_sts,
> + .msg_set_mask = idt_ntb_msg_set_mask,
> + .msg_clear_mask = idt_ntb_msg_clear_mask,
> + .msg_read = idt_ntb_msg_read,
> + .msg_write = idt_ntb_msg_write
> +};
> +
> +/*
> + * idt_register_device() - register IDT NTB device
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * Return: zero on success, otherwise a negative error number.
> + */
> +static int idt_register_device(struct idt_ntb_dev *ndev)
> +{
> + int ret;
> +
> + /* Initialize the rest of NTB device structure and register it */
> + ndev->ntb.ops = &idt_ntb_ops;
> + ndev->ntb.topo = NTB_TOPO_PRI;
> +
> + ret = ntb_register_device(&ndev->ntb);
> + if (ret != 0) {
> + dev_err(&ndev->ntb.pdev->dev, "Failed to register NTB device");
> + return ret;
> + }
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "NTB device successfully registered");
> +
> + return 0;
> +}
> +
> +/*
> + * idt_unregister_device() - unregister IDT NTB device
> + * @ndev: IDT NTB hardware driver descriptor
> + */
> +static void idt_unregister_device(struct idt_ntb_dev *ndev)
> +{
> + /* Just unregister the NTB device */
> + ntb_unregister_device(&ndev->ntb);
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "NTB device unregistered");
> +}
> +
> +/*=============================================================================
> + * 10. DebugFS node initialization
> + *=============================================================================
> + */
> +
> +static ssize_t idt_dbgfs_info_read(struct file *filp, char __user *ubuf,
> + size_t count, loff_t *offp);
> +
> +/*
> + * Driver DebugFS info file operations
> + */
> +static const struct file_operations idt_dbgfs_info_ops = {
> + .owner = THIS_MODULE,
> + .open = simple_open,
> + .read = idt_dbgfs_info_read
> +};
> +
> +/*
> + * idt_dbgfs_info_read() - DebugFS read info node callback
> + * @file: File node descriptor.
> + * @ubuf: User-space buffer to put data to
> + * @count: Size of the buffer
> + * @offp: Offset within the buffer
> + */
> +static ssize_t idt_dbgfs_info_read(struct file *filp, char __user *ubuf,
> + size_t count, loff_t *offp)
> +{
> + struct idt_ntb_dev *ndev = filp->private_data;
> + enum ntb_speed speed;
> + enum ntb_width width;
> + char *strbuf;
> + size_t size;
> + ssize_t ret = 0, off = 0;
> + unsigned char temp, frac, idx;
> + u32 data;
> +
> + /* Lets limit the buffer size the way the Intel/AMD drivers do */
> + size = min_t(size_t, count, 0x500U);
> +
> + /* Allocate the memory for the buffer */
> + strbuf = kmalloc(size, GFP_KERNEL);
> + if (strbuf == NULL)
> + return -ENOMEM;
> +
> + /* Put the data into the string buffer */
> + off += scnprintf(strbuf + off, size - off,
> + "\n\t\tIDT NTB device Information:\n\n");
> +
> + /* General device configurations */
> + off += scnprintf(strbuf + off, size - off,
> + "Switch port\t\t\t- %hhu\n", ndev->port);
> + off += scnprintf(strbuf + off, size - off,
> + "Port partition\t\t\t- %hhu\n", ndev->part);
> + off += scnprintf(strbuf + off, size - off,
> + "Peers Port:Partition\t\t- ");
> + for (idx = 0; idx < ndev->peer_cnt; idx++) {
> + off += scnprintf(strbuf + off, size - off, "p%hhu:%hhu ",
> + ndev->peers[idx].port, ndev->peers[idx].part);
> + }
> + off += scnprintf(strbuf + off, size - off, "\n");
> +
> + /* Links status */
> + data = idt_ntb_link_is_up(&ndev->ntb, &speed, &width);
> + off += scnprintf(strbuf + off, size - off,
> + "NTB link status\t\t\t- 0x%08x, ", data);
> + off += scnprintf(strbuf + off, size - off, "PCIe Gen %d ",
> + speed);
> + off += scnprintf(strbuf + off, size - off, "x%d lanes\n",
> + width);
> +
> + /* Memory windows information */
> + off += scnprintf(strbuf + off, size - off,
> + "Outbound MWs count\t\t- %u\n", ndev->mw_cnt);
> + off += scnprintf(strbuf + off, size - off,
> + "Inbound MWs count\t\t- ");
> + for (idx = 0; idx < ndev->peer_cnt; idx++) {
> + off += scnprintf(strbuf + off, size - off, "p%hhu:%hhu ",
> + ndev->peers[idx].port, ndev->peers[idx].mw_cnt);
> + }
> + off += scnprintf(strbuf + off, size - off, "\n");
> +
> + /* Doorbell information */
> + data = idt_ntb_db_read(&ndev->ntb);
> + off += scnprintf(strbuf + off, size - off,
> + "Doorbell register state\t\t- 0x%08x\n", data);
> + data = idt_nt_read(ndev, IDT_NT_INDBELLMSK);
> + off += scnprintf(strbuf + off, size - off,
> + "Doorbell mask state\t\t- 0x%08x\n", data);
> +
> + /* Messaging information */
> + data = idt_ntb_msg_read_sts(&ndev->ntb);
> + off += scnprintf(strbuf + off, size - off,
> + "Message registers status\t- 0x%08x\n", data);
> + off += scnprintf(strbuf + off, size - off,
> + "Message data\t\t\t- ");
> + for (idx = 0; idx < IDT_MSG_CNT; idx++) {
> + int src;
> + (void)idt_ntb_msg_read(&ndev->ntb, idx, &src, &data);
> + off += scnprintf(strbuf + off, size - off,
> + "m%hhu:0x%08x<-%hhu ",
> + idx, data, ndev->peers[src].port);
> + }
> + off += scnprintf(strbuf + off, size - off, "\n");
> +
> + /* Current temperature */
> + idt_read_temp(ndev, &temp, &frac);
> + off += scnprintf(strbuf + off, size - off,
> + "Switch temperature\t\t- %hhu.%hhuC\n", temp, frac);
> +
> + /* Copy the buffer to the User Space */
> + ret = simple_read_from_buffer(ubuf, count, offp, strbuf, off);
> + kfree(strbuf);
> +
> + return ret;
> +}
> +
> +/*
> + * idt_init_dbgfs() - initialize DebugFS node
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * Return: zero on success, otherwise a negative error number.
> + */
> +static int idt_init_dbgfs(struct idt_ntb_dev *ndev)
> +{
> + char devname[64];
> +
> + /* If the top directory is not created then do nothing */
> + if (IS_ERR_OR_NULL(dbgfs_topdir)) {
> + dev_info(&ndev->ntb.pdev->dev, "Top DebugFS directory absent");
> + return PTR_ERR(dbgfs_topdir);
> + }
> +
> + /* Create the info file node */
> + snprintf(devname, 64, "info:%s", pci_name(ndev->ntb.pdev));
> + ndev->dbgfs_info = debugfs_create_file(devname, 0400, dbgfs_topdir,
> + ndev, &idt_dbgfs_info_ops);
> + if (IS_ERR(ndev->dbgfs_info)) {
> + dev_dbg(&ndev->ntb.pdev->dev, "Failed to create DebugFS node");
> + return PTR_ERR(ndev->dbgfs_info);
> + }
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "NTB device DebugFS node created");
> +
> + return 0;
> +}
> +
> +/*
> + * idt_deinit_dbgfs() - deinitialize DebugFS node
> + * @ndev: IDT NTB hardware driver descriptor
> + *
> + * Just discard the info node from DebugFS
> + */
> +static void idt_deinit_dbgfs(struct idt_ntb_dev *ndev)
> +{
> + debugfs_remove(ndev->dbgfs_info);
> +
> + dev_dbg(&ndev->ntb.pdev->dev, "NTB device DebugFS node discarded");
> +}
> +
> +/*=============================================================================
> + * 11. Basic PCIe device initialization
> + *=============================================================================
> + */
> +
> +/*
> + * idt_check_setup() - Check whether the IDT PCIe-swtich is properly
> + * pre-initialized
> + * @pdev: Pointer to the PCI device descriptor
> + *
> + * Return: zero on success, otherwise a negative error number.
> + */
> +static int idt_check_setup(struct pci_dev *pdev)
> +{
> + u32 data;
> + int ret;
> +
> + /* Read the BARSETUP0 */
> + ret = pci_read_config_dword(pdev, IDT_NT_BARSETUP0, &data);
> + if (ret != 0) {
> + dev_err(&pdev->dev,
> + "Failed to read BARSETUP0 config register");
> + return ret;
> + }
> +
> + /* Check whether the BAR0 register is enabled to be of config space */
> + if (!(data & IDT_BARSETUP_EN) || !(data & IDT_BARSETUP_MODE_CFG)) {
> + dev_err(&pdev->dev, "BAR0 doesn't map config space");
> + return -EINVAL;
> + }
> +
> + /* Configuration space BAR0 must have certain size */
> + if ((data & IDT_BARSETUP_SIZE_MASK) != IDT_BARSETUP_SIZE_CFG) {
> + dev_err(&pdev->dev, "Invalid size of config space");
> + return -EINVAL;
> + }
> +
> + dev_dbg(&pdev->dev, "NTB device pre-initialized correctly");
> +
> + return 0;
> +}
> +
> +/*
> + * Create the IDT PCIe-switch driver descriptor
> + * @pdev: Pointer to the PCI device descriptor
> + * @id: IDT PCIe-device configuration
> + *
> + * It just allocates a memory for IDT PCIe-switch device structure and
> + * initializes some commonly used fields.
> + *
> + * No need of release method, since managed device resource is used for
> + * memory allocation.
> + *
> + * Return: pointer to the descriptor, otherwise a negative error number.
> + */
> +static struct idt_ntb_dev *idt_create_dev(struct pci_dev *pdev,
> + const struct pci_device_id *id)
> +{
> + struct idt_ntb_dev *ndev;
> +
> + /* Allocate memory for the IDT PCIe-device descriptor */
> + ndev = devm_kzalloc(&pdev->dev, sizeof(*ndev), GFP_KERNEL);
> + if (IS_ERR_OR_NULL(ndev)) {
> + dev_err(&pdev->dev, "Memory allocation failed for descriptor");
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + /* Save the IDT PCIe-switch ports configuration */
> + ndev->swcfg = (struct idt_89hpes_cfg *)id->driver_data;
> + /* Save the PCI-device pointer inside the NTB device structure */
> + ndev->ntb.pdev = pdev;
> +
> + /* Initialize spin locker of Doorbell, Message and GASA registers */
> + spin_lock_init(&ndev->db_mask_lock);
> + spin_lock_init(&ndev->msg_mask_lock);
> + spin_lock_init(&ndev->gasa_lock);
> +
> + dev_info(&pdev->dev, "IDT %s discovered", ndev->swcfg->name);
> +
> + dev_dbg(&pdev->dev, "NTB device descriptor created");
> +
> + return ndev;
> +}
> +
> +/*
> + * idt_init_pci() - initialize the basic PCI-related subsystem
> + * @ndev: Pointer to the IDT PCIe-switch driver descriptor
> + *
> + * Managed device resources will be freed automatically in case of failure or
> + * driver detachment.
> + *
> + * Return: zero on success, otherwise negative error number.
> + */
> +static int idt_init_pci(struct idt_ntb_dev *ndev)
> +{
> + struct pci_dev *pdev = ndev->ntb.pdev;
> + int ret;
> +
> + /* Initialize the bit mask of DMA */
> + ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
> + if (ret != 0) {
> + ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
> + if (ret != 0) {
> + dev_err(&pdev->dev, "Failed to set DMA bit mask\n");
> + return ret;
> + }
> + dev_warn(&pdev->dev, "Cannot set DMA highmem bit mask\n");
> + }
> + ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
> + if (ret != 0) {
> + ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
> + if (ret != 0) {
> + dev_err(&pdev->dev,
> + "Failed to set consistent DMA bit mask\n");
> + return ret;
> + }
> + dev_warn(&pdev->dev,
> + "Cannot set consistent DMA highmem bit mask\n");
> + }
> +
> + /*
> + * Enable the device advanced error reporting. It's not critical to
> + * have AER disabled in the kernel.
> + */
> + ret = pci_enable_pcie_error_reporting(pdev);
> + if (ret != 0)
> + dev_warn(&pdev->dev, "PCIe AER capability disabled\n");
> + else /* Cleanup uncorrectable error status before getting to init */
> + pci_cleanup_aer_uncorrect_error_status(pdev);
> +
> + /* First enable the PCI device */
> + ret = pcim_enable_device(pdev);
> + if (ret != 0) {
> + dev_err(&pdev->dev, "Failed to enable PCIe device\n");
> + goto err_disable_aer;
> + }
> +
> + /*
> + * Enable the bus mastering, which effectively enables MSI IRQs and
> + * Request TLPs translation
> + */
> + pci_set_master(pdev);
> +
> + /* Request all BARs resources and map BAR0 only */
> + ret = pcim_iomap_regions_request_all(pdev, 1, NTB_NAME);
> + if (ret != 0) {
> + dev_err(&pdev->dev, "Failed to request resources\n");
> + goto err_clear_master;
> + }
> +
> + /* Retrieve virtual address of BAR0 - PCI configuration space */
> + ndev->cfgspc = pcim_iomap_table(pdev)[0];
> +
> + /* Put the IDT driver data pointer to the PCI-device private pointer */
> + pci_set_drvdata(pdev, ndev);
> +
> + dev_dbg(&pdev->dev, "NT-function PCIe interface initialized");
> +
> + return 0;
> +
> +err_clear_master:
> + pci_clear_master(pdev);
> +err_disable_aer:
> + (void)pci_disable_pcie_error_reporting(pdev);
> +
> + return ret;
> +}
> +
> +/*
> + * idt_deinit_pci() - deinitialize the basic PCI-related subsystem
> + * @ndev: Pointer to the IDT PCIe-switch driver descriptor
> + *
> + * Managed resources will be freed on the driver detachment
> + */
> +static void idt_deinit_pci(struct idt_ntb_dev *ndev)
> +{
> + struct pci_dev *pdev = ndev->ntb.pdev;
> +
> + /* Clean up the PCI-device private data pointer */
> + pci_set_drvdata(pdev, NULL);
> +
> + /* Clear the bus master disabling the Request TLPs translation */
> + pci_clear_master(pdev);
> +
> + /* Disable the AER capability */
> + (void)pci_disable_pcie_error_reporting(pdev);
> +
> + dev_dbg(&pdev->dev, "NT-function PCIe interface cleared");
> +}
> +
> +/*===========================================================================
> + * 12. PCI bus callback functions
> + *===========================================================================
> + */
> +
> +/*
> + * idt_pci_probe() - PCI device probe callback
> + * @pdev: Pointer to PCI device structure
> + * @id: PCIe device custom descriptor
> + *
> + * Return: zero on success, otherwise negative error number
> + */
> +static int idt_pci_probe(struct pci_dev *pdev,
> + const struct pci_device_id *id)
> +{
> + struct idt_ntb_dev *ndev;
> + int ret;
> +
> + /* Check whether IDT PCIe-switch is properly pre-initialized */
> + ret = idt_check_setup(pdev);
> + if (ret != 0)
> + return ret;
> +
> + /* Allocate the memory for IDT NTB device data */
> + ndev = idt_create_dev(pdev, id);
> + if (IS_ERR_OR_NULL(ndev))
> + return PTR_ERR(ndev);
> +
> + /* Initialize the basic PCI subsystem of the device */
> + ret = idt_init_pci(ndev);
> + if (ret != 0)
> + return ret;
> +
> + /* Scan ports of the IDT PCIe-switch */
> + (void)idt_scan_ports(ndev);
> +
> + /* Initialize NTB link events subsystem */
> + idt_init_link(ndev);
> +
> + /* Initialize MWs subsystem */
> + ret = idt_init_mws(ndev);
> + if (ret != 0)
> + goto err_deinit_link;
> +
> + /* Initialize Messaging subsystem */
> + idt_init_msg(ndev);
> +
> + /* Initialize IDT interrupts handler */
> + ret = idt_init_isr(ndev);
> + if (ret != 0)
> + goto err_deinit_link;
> +
> + /* Register IDT NTB devices on the NTB bus */
> + ret = idt_register_device(ndev);
> + if (ret != 0)
> + goto err_deinit_isr;
> +
> + /* Initialize DebugFS info node */
> + (void)idt_init_dbgfs(ndev);
> +
> + /* IDT PCIe-switch NTB driver is finally initialized */
> + dev_info(&pdev->dev, "IDT NTB device is ready");
> +
> + /* May the force be with us... */
> + return 0;
> +
> +err_deinit_isr:
> + idt_deinit_isr(ndev);
> +err_deinit_link:
> + idt_deinit_link(ndev);
> + idt_deinit_pci(ndev);
> +
> + return ret;
> +}
> +
> +/*
> + * idt_pci_probe() - PCI device remove callback
> + * @pdev: Pointer to PCI device structure
> + */
> +static void idt_pci_remove(struct pci_dev *pdev)
> +{
> + struct idt_ntb_dev *ndev = pci_get_drvdata(pdev);
> +
> + /* Deinit the DebugFS node */
> + idt_deinit_dbgfs(ndev);
> +
> + /* Unregister NTB device */
> + idt_unregister_device(ndev);
> +
> + /* Stop the interrupts handling */
> + idt_deinit_isr(ndev);
> +
> + /* Deinitialize link event subsystem */
> + idt_deinit_link(ndev);
> +
> + /* Deinit basic PCI subsystem */
> + idt_deinit_pci(ndev);
> +
> + /* IDT PCIe-switch NTB driver is finally initialized */
> + dev_info(&pdev->dev, "IDT NTB device is removed");
> +
> + /* Sayonara... */
> +}
> +
> +/*
> + * IDT PCIe-switch models ports configuration structures
> + */
> +static struct idt_89hpes_cfg idt_89hpes24nt6ag2_config = {
> + .name = "89HPES24NT6AG2",
> + .port_cnt = 6, .ports = {0, 2, 4, 6, 8, 12}
> +};
> +static struct idt_89hpes_cfg idt_89hpes32nt8ag2_config = {
> + .name = "89HPES32NT8AG2",
> + .port_cnt = 8, .ports = {0, 2, 4, 6, 8, 12, 16, 20}
> +};
> +static struct idt_89hpes_cfg idt_89hpes32nt8bg2_config = {
> + .name = "89HPES32NT8BG2",
> + .port_cnt = 8, .ports = {0, 2, 4, 6, 8, 12, 16, 20}
> +};
> +static struct idt_89hpes_cfg idt_89hpes12nt12g2_config = {
> + .name = "89HPES12NT12G2",
> + .port_cnt = 3, .ports = {0, 8, 16}
> +};
> +static struct idt_89hpes_cfg idt_89hpes16nt16g2_config = {
> + .name = "89HPES16NT16G2",
> + .port_cnt = 4, .ports = {0, 8, 12, 16}
> +};
> +static struct idt_89hpes_cfg idt_89hpes24nt24g2_config = {
> + .name = "89HPES24NT24G2",
> + .port_cnt = 8, .ports = {0, 2, 4, 6, 8, 12, 16, 20}
> +};
> +static struct idt_89hpes_cfg idt_89hpes32nt24ag2_config = {
> + .name = "89HPES32NT24AG2",
> + .port_cnt = 8, .ports = {0, 2, 4, 6, 8, 12, 16, 20}
> +};
> +static struct idt_89hpes_cfg idt_89hpes32nt24bg2_config = {
> + .name = "89HPES32NT24BG2",
> + .port_cnt = 8, .ports = {0, 2, 4, 6, 8, 12, 16, 20}
> +};
> +
> +/*
> + * PCI-ids table of the supported IDT PCIe-switch devices
> + */
> +static const struct pci_device_id idt_pci_tbl[] = {
> + {IDT_PCI_DEVICE_IDS(89HPES24NT6AG2, idt_89hpes24nt6ag2_config)},
> + {IDT_PCI_DEVICE_IDS(89HPES32NT8AG2, idt_89hpes32nt8ag2_config)},
> + {IDT_PCI_DEVICE_IDS(89HPES32NT8BG2, idt_89hpes32nt8bg2_config)},
> + {IDT_PCI_DEVICE_IDS(89HPES12NT12G2, idt_89hpes12nt12g2_config)},
> + {IDT_PCI_DEVICE_IDS(89HPES16NT16G2, idt_89hpes16nt16g2_config)},
> + {IDT_PCI_DEVICE_IDS(89HPES24NT24G2, idt_89hpes24nt24g2_config)},
> + {IDT_PCI_DEVICE_IDS(89HPES32NT24AG2, idt_89hpes32nt24ag2_config)},
> + {IDT_PCI_DEVICE_IDS(89HPES32NT24BG2, idt_89hpes32nt24bg2_config)},
> + {0}
> +};
> +MODULE_DEVICE_TABLE(pci, idt_pci_tbl);
> +
> +/*
> + * IDT PCIe-switch NT-function device driver structure definition
> + */
> +static struct pci_driver idt_pci_driver = {
> + .name = KBUILD_MODNAME,
> + .probe = idt_pci_probe,
> + .remove = idt_pci_remove,
> + .id_table = idt_pci_tbl,
> +};
> +
> +static int __init idt_pci_driver_init(void)
> +{
> + pr_info("%s %s\n", NTB_DESC, NTB_VER);
> +
> + /* Create the top DebugFS directory if the FS is initialized */
> + if (debugfs_initialized())
> + dbgfs_topdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
> +
> + /* Register the NTB hardware driver to handle the PCI device */
> + return pci_register_driver(&idt_pci_driver);
> +}
> +module_init(idt_pci_driver_init);
> +
> +static void __exit idt_pci_driver_exit(void)
> +{
> + /* Unregister the NTB hardware driver */
> + pci_unregister_driver(&idt_pci_driver);
> +
> + /* Discard the top DebugFS directory */
> + debugfs_remove_recursive(dbgfs_topdir);
> +}
> +module_exit(idt_pci_driver_exit);
> +
> diff --git a/drivers/ntb/hw/idt/ntb_hw_idt.h b/drivers/ntb/hw/idt/ntb_hw_idt.h
> new file mode 100644
> index 0000000..856fd18
> --- /dev/null
> +++ b/drivers/ntb/hw/idt/ntb_hw_idt.h
> @@ -0,0 +1,1149 @@
> +/*
> + * This file is provided under a GPLv2 license. When using or
> + * redistributing this file, you may do so under that license.
> + *
> + * GPL LICENSE SUMMARY
> + *
> + * Copyright (C) 2016 T-Platforms All Rights Reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
> + * Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, one can be found http://www.gnu.org/licenses/.
> + *
> + * The full GNU General Public License is included in this distribution in
> + * the file called "COPYING".
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + *
> + * IDT PCIe-switch NTB Linux driver
> + *
> + * Contact Information:
> + * Serge Semin <fancer.lancer@xxxxxxxxx>, <Sergey.Semin@xxxxxxxxxxxxxx>
> + */
> +
> +#ifndef NTB_HW_IDT_H
> +#define NTB_HW_IDT_H
> +
> +#include <linux/types.h>
> +#include <linux/pci.h>
> +#include <linux/pci_ids.h>
> +#include <linux/interrupt.h>
> +#include <linux/spinlock.h>
> +#include <linux/ntb.h>
> +
> +
> +/*
> + * Macro is used to create the struct pci_device_id that matches
> + * the supported IDT PCIe-switches
> + * @devname: Capitalized name of the particular device
> + * @data: Variable passed to the driver of the particular device
> + */
> +#define IDT_PCI_DEVICE_IDS(devname, data) \
> + .vendor = PCI_VENDOR_ID_IDT, .device = PCI_DEVICE_ID_IDT_##devname, \
> + .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, \
> + .class = (PCI_CLASS_BRIDGE_OTHER << 8), .class_mask = (0xFFFF00), \
> + .driver_data = (kernel_ulong_t)&data
> +
> +/*
> + * IDT PCIe-switches device IDs
> + */
> +#define PCI_DEVICE_ID_IDT_89HPES24NT6AG2 0x8091
> +#define PCI_DEVICE_ID_IDT_89HPES32NT8AG2 0x808F
> +#define PCI_DEVICE_ID_IDT_89HPES32NT8BG2 0x8088
> +#define PCI_DEVICE_ID_IDT_89HPES12NT12G2 0x8092
> +#define PCI_DEVICE_ID_IDT_89HPES16NT16G2 0x8090
> +#define PCI_DEVICE_ID_IDT_89HPES24NT24G2 0x808E
> +#define PCI_DEVICE_ID_IDT_89HPES32NT24AG2 0x808C
> +#define PCI_DEVICE_ID_IDT_89HPES32NT24BG2 0x808A
> +
> +/*
> + * NT-function Configuration Space registers
> + * NOTE 1) The IDT PCIe-switch internal data is little-endian
> + * so it must be taken into account in the driver
> + * internals.
> + * 2) Additionally the registers should be accessed either
> + * with byte-enables corresponding to their native size or
> + * the size of one DWORD
> + *
> + * So to simplify the driver code, there is only DWORD-sized read/write
> + * operations utilized.
> + */
> +/* PCI Express Configuration Space */
> +/* PCI Express command/status register (DWORD) */
> +#define IDT_NT_PCICMDSTS 0x00004U
> +/* PCI Express Device Capabilities (DWORD) */
> +#define IDT_NT_PCIEDCAP 0x00044U
> +/* PCI Express Device Control/Status (WORD+WORD) */
> +#define IDT_NT_PCIEDCTLSTS 0x00048U
> +/* PCI Express Link Capabilities (DWORD) */
> +#define IDT_NT_PCIELCAP 0x0004CU
> +/* PCI Express Link Control/Status (WORD+WORD) */
> +#define IDT_NT_PCIELCTLSTS 0x00050U
> +/* PCI Express Device Capabilities 2 (DWORD) */
> +#define IDT_NT_PCIEDCAP2 0x00064U
> +/* PCI Express Device Control 2 (WORD+WORD) */
> +#define IDT_NT_PCIEDCTL2 0x00068U
> +/* PCI Power Management Control and Status (DWORD) */
> +#define IDT_NT_PMCSR 0x000C4U
> +/*==========================================*/
> +/* IDT Proprietary NT-port-specific registers */
> +/* NT-function main control registers */
> +/* NT Endpoint Control (DWORD) */
> +#define IDT_NT_NTCTL 0x00400U
> +/* NT Endpoint Interrupt Status/Mask (DWORD) */
> +#define IDT_NT_NTINTSTS 0x00404U
> +#define IDT_NT_NTINTMSK 0x00408U
> +/* NT Endpoint Signal Data (DWORD) */
> +#define IDT_NT_NTSDATA 0x0040CU
> +/* NT Endpoint Global Signal (DWORD) */
> +#define IDT_NT_NTGSIGNAL 0x00410U
> +/* Internal Error Reporting Mask 0/1 (DWORD) */
> +#define IDT_NT_NTIERRORMSK0 0x00414U
> +#define IDT_NT_NTIERRORMSK1 0x00418U
> +/* Doorbel registers */
> +/* NT Outbound Doorbell Set (DWORD) */
> +#define IDT_NT_OUTDBELLSET 0x00420U
> +/* NT Inbound Doorbell Status/Mask (DWORD) */
> +#define IDT_NT_INDBELLSTS 0x00428U
> +#define IDT_NT_INDBELLMSK 0x0042CU
> +/* Message registers */
> +/* Outbound Message N (DWORD) */
> +#define IDT_NT_OUTMSG0 0x00430U
> +#define IDT_NT_OUTMSG1 0x00434U
> +#define IDT_NT_OUTMSG2 0x00438U
> +#define IDT_NT_OUTMSG3 0x0043CU
> +/* Inbound Message N (DWORD) */
> +#define IDT_NT_INMSG0 0x00440U
> +#define IDT_NT_INMSG1 0x00444U
> +#define IDT_NT_INMSG2 0x00448U
> +#define IDT_NT_INMSG3 0x0044CU
> +/* Inbound Message Source N (DWORD) */
> +#define IDT_NT_INMSGSRC0 0x00450U
> +#define IDT_NT_INMSGSRC1 0x00454U
> +#define IDT_NT_INMSGSRC2 0x00458U
> +#define IDT_NT_INMSGSRC3 0x0045CU
> +/* Message Status (DWORD) */
> +#define IDT_NT_MSGSTS 0x00460U
> +/* Message Status Mask (DWORD) */
> +#define IDT_NT_MSGSTSMSK 0x00464U
> +/* BAR-setup registers */
> +/* BAR N Setup/Limit Address/Lower and Upper Translated Base Address (DWORD) */
> +#define IDT_NT_BARSETUP0 0x00470U
> +#define IDT_NT_BARLIMIT0 0x00474U
> +#define IDT_NT_BARLTBASE0 0x00478U
> +#define IDT_NT_BARUTBASE0 0x0047CU
> +#define IDT_NT_BARSETUP1 0x00480U
> +#define IDT_NT_BARLIMIT1 0x00484U
> +#define IDT_NT_BARLTBASE1 0x00488U
> +#define IDT_NT_BARUTBASE1 0x0048CU
> +#define IDT_NT_BARSETUP2 0x00490U
> +#define IDT_NT_BARLIMIT2 0x00494U
> +#define IDT_NT_BARLTBASE2 0x00498U
> +#define IDT_NT_BARUTBASE2 0x0049CU
> +#define IDT_NT_BARSETUP3 0x004A0U
> +#define IDT_NT_BARLIMIT3 0x004A4U
> +#define IDT_NT_BARLTBASE3 0x004A8U
> +#define IDT_NT_BARUTBASE3 0x004ACU
> +#define IDT_NT_BARSETUP4 0x004B0U
> +#define IDT_NT_BARLIMIT4 0x004B4U
> +#define IDT_NT_BARLTBASE4 0x004B8U
> +#define IDT_NT_BARUTBASE4 0x004BCU
> +#define IDT_NT_BARSETUP5 0x004C0U
> +#define IDT_NT_BARLIMIT5 0x004C4U
> +#define IDT_NT_BARLTBASE5 0x004C8U
> +#define IDT_NT_BARUTBASE5 0x004CCU
> +/* NT mapping table registers */
> +/* NT Mapping Table Address/Status/Data (DWORD) */
> +#define IDT_NT_NTMTBLADDR 0x004D0U
> +#define IDT_NT_NTMTBLSTS 0x004D4U
> +#define IDT_NT_NTMTBLDATA 0x004D8U
> +/* Requester ID (Bus:Device:Function) Capture (DWORD) */
> +#define IDT_NT_REQIDCAP 0x004DCU
> +/* Memory Windows Lookup table registers */
> +/* Lookup Table Offset/Lower, Middle and Upper data (DWORD) */
> +#define IDT_NT_LUTOFFSET 0x004E0U
> +#define IDT_NT_LUTLDATA 0x004E4U
> +#define IDT_NT_LUTMDATA 0x004E8U
> +#define IDT_NT_LUTUDATA 0x004ECU
> +/* NT Endpoint Uncorrectable/Correctable Errors Emulation registers (DWORD) */
> +#define IDT_NT_NTUEEM 0x004F0U
> +#define IDT_NT_NTCEEM 0x004F4U
> +/* Global Address Space Access/Data registers (DWARD) */
> +#define IDT_NT_GASAADDR 0x00FF8U
> +#define IDT_NT_GASADATA 0x00FFCU
> +
> +/*
> + * IDT PCIe-switch Global Configuration and Status registers
> + */
> +/* Port N Configuration register in global space */
> +/* PCI Express command/status and link control/status registers (WORD+WORD) */
> +#define IDT_SW_NTP0_PCIECMDSTS 0x01004U
> +#define IDT_SW_NTP0_PCIELCTLSTS 0x01050U
> +/* NT-function control register (DWORD) */
> +#define IDT_SW_NTP0_NTCTL 0x01400U
> +/* BAR setup/limit/base address registers (DWORD) */
> +#define IDT_SW_NTP0_BARSETUP0 0x01470U
> +#define IDT_SW_NTP0_BARLIMIT0 0x01474U
> +#define IDT_SW_NTP0_BARLTBASE0 0x01478U
> +#define IDT_SW_NTP0_BARUTBASE0 0x0147CU
> +#define IDT_SW_NTP0_BARSETUP1 0x01480U
> +#define IDT_SW_NTP0_BARLIMIT1 0x01484U
> +#define IDT_SW_NTP0_BARLTBASE1 0x01488U
> +#define IDT_SW_NTP0_BARUTBASE1 0x0148CU
> +#define IDT_SW_NTP0_BARSETUP2 0x01490U
> +#define IDT_SW_NTP0_BARLIMIT2 0x01494U
> +#define IDT_SW_NTP0_BARLTBASE2 0x01498U
> +#define IDT_SW_NTP0_BARUTBASE2 0x0149CU
> +#define IDT_SW_NTP0_BARSETUP3 0x014A0U
> +#define IDT_SW_NTP0_BARLIMIT3 0x014A4U
> +#define IDT_SW_NTP0_BARLTBASE3 0x014A8U
> +#define IDT_SW_NTP0_BARUTBASE3 0x014ACU
> +#define IDT_SW_NTP0_BARSETUP4 0x014B0U
> +#define IDT_SW_NTP0_BARLIMIT4 0x014B4U
> +#define IDT_SW_NTP0_BARLTBASE4 0x014B8U
> +#define IDT_SW_NTP0_BARUTBASE4 0x014BCU
> +#define IDT_SW_NTP0_BARSETUP5 0x014C0U
> +#define IDT_SW_NTP0_BARLIMIT5 0x014C4U
> +#define IDT_SW_NTP0_BARLTBASE5 0x014C8U
> +#define IDT_SW_NTP0_BARUTBASE5 0x014CCU
> +/* PCI Express command/status and link control/status registers (WORD+WORD) */
> +#define IDT_SW_NTP2_PCIECMDSTS 0x05004U
> +#define IDT_SW_NTP2_PCIELCTLSTS 0x05050U
> +/* NT-function control register (DWORD) */
> +#define IDT_SW_NTP2_NTCTL 0x05400U
> +/* BAR setup/limit/base address registers (DWORD) */
> +#define IDT_SW_NTP2_BARSETUP0 0x05470U
> +#define IDT_SW_NTP2_BARLIMIT0 0x05474U
> +#define IDT_SW_NTP2_BARLTBASE0 0x05478U
> +#define IDT_SW_NTP2_BARUTBASE0 0x0547CU
> +#define IDT_SW_NTP2_BARSETUP1 0x05480U
> +#define IDT_SW_NTP2_BARLIMIT1 0x05484U
> +#define IDT_SW_NTP2_BARLTBASE1 0x05488U
> +#define IDT_SW_NTP2_BARUTBASE1 0x0548CU
> +#define IDT_SW_NTP2_BARSETUP2 0x05490U
> +#define IDT_SW_NTP2_BARLIMIT2 0x05494U
> +#define IDT_SW_NTP2_BARLTBASE2 0x05498U
> +#define IDT_SW_NTP2_BARUTBASE2 0x0549CU
> +#define IDT_SW_NTP2_BARSETUP3 0x054A0U
> +#define IDT_SW_NTP2_BARLIMIT3 0x054A4U
> +#define IDT_SW_NTP2_BARLTBASE3 0x054A8U
> +#define IDT_SW_NTP2_BARUTBASE3 0x054ACU
> +#define IDT_SW_NTP2_BARSETUP4 0x054B0U
> +#define IDT_SW_NTP2_BARLIMIT4 0x054B4U
> +#define IDT_SW_NTP2_BARLTBASE4 0x054B8U
> +#define IDT_SW_NTP2_BARUTBASE4 0x054BCU
> +#define IDT_SW_NTP2_BARSETUP5 0x054C0U
> +#define IDT_SW_NTP2_BARLIMIT5 0x054C4U
> +#define IDT_SW_NTP2_BARLTBASE5 0x054C8U
> +#define IDT_SW_NTP2_BARUTBASE5 0x054CCU
> +/* PCI Express command/status and link control/status registers (WORD+WORD) */
> +#define IDT_SW_NTP4_PCIECMDSTS 0x09004U
> +#define IDT_SW_NTP4_PCIELCTLSTS 0x09050U
> +/* NT-function control register (DWORD) */
> +#define IDT_SW_NTP4_NTCTL 0x09400U
> +/* BAR setup/limit/base address registers (DWORD) */
> +#define IDT_SW_NTP4_BARSETUP0 0x09470U
> +#define IDT_SW_NTP4_BARLIMIT0 0x09474U
> +#define IDT_SW_NTP4_BARLTBASE0 0x09478U
> +#define IDT_SW_NTP4_BARUTBASE0 0x0947CU
> +#define IDT_SW_NTP4_BARSETUP1 0x09480U
> +#define IDT_SW_NTP4_BARLIMIT1 0x09484U
> +#define IDT_SW_NTP4_BARLTBASE1 0x09488U
> +#define IDT_SW_NTP4_BARUTBASE1 0x0948CU
> +#define IDT_SW_NTP4_BARSETUP2 0x09490U
> +#define IDT_SW_NTP4_BARLIMIT2 0x09494U
> +#define IDT_SW_NTP4_BARLTBASE2 0x09498U
> +#define IDT_SW_NTP4_BARUTBASE2 0x0949CU
> +#define IDT_SW_NTP4_BARSETUP3 0x094A0U
> +#define IDT_SW_NTP4_BARLIMIT3 0x094A4U
> +#define IDT_SW_NTP4_BARLTBASE3 0x094A8U
> +#define IDT_SW_NTP4_BARUTBASE3 0x094ACU
> +#define IDT_SW_NTP4_BARSETUP4 0x094B0U
> +#define IDT_SW_NTP4_BARLIMIT4 0x094B4U
> +#define IDT_SW_NTP4_BARLTBASE4 0x094B8U
> +#define IDT_SW_NTP4_BARUTBASE4 0x094BCU
> +#define IDT_SW_NTP4_BARSETUP5 0x094C0U
> +#define IDT_SW_NTP4_BARLIMIT5 0x094C4U
> +#define IDT_SW_NTP4_BARLTBASE5 0x094C8U
> +#define IDT_SW_NTP4_BARUTBASE5 0x094CCU
> +/* PCI Express command/status and link control/status registers (WORD+WORD) */
> +#define IDT_SW_NTP6_PCIECMDSTS 0x0D004U
> +#define IDT_SW_NTP6_PCIELCTLSTS 0x0D050U
> +/* NT-function control register (DWORD) */
> +#define IDT_SW_NTP6_NTCTL 0x0D400U
> +/* BAR setup/limit/base address registers (DWORD) */
> +#define IDT_SW_NTP6_BARSETUP0 0x0D470U
> +#define IDT_SW_NTP6_BARLIMIT0 0x0D474U
> +#define IDT_SW_NTP6_BARLTBASE0 0x0D478U
> +#define IDT_SW_NTP6_BARUTBASE0 0x0D47CU
> +#define IDT_SW_NTP6_BARSETUP1 0x0D480U
> +#define IDT_SW_NTP6_BARLIMIT1 0x0D484U
> +#define IDT_SW_NTP6_BARLTBASE1 0x0D488U
> +#define IDT_SW_NTP6_BARUTBASE1 0x0D48CU
> +#define IDT_SW_NTP6_BARSETUP2 0x0D490U
> +#define IDT_SW_NTP6_BARLIMIT2 0x0D494U
> +#define IDT_SW_NTP6_BARLTBASE2 0x0D498U
> +#define IDT_SW_NTP6_BARUTBASE2 0x0D49CU
> +#define IDT_SW_NTP6_BARSETUP3 0x0D4A0U
> +#define IDT_SW_NTP6_BARLIMIT3 0x0D4A4U
> +#define IDT_SW_NTP6_BARLTBASE3 0x0D4A8U
> +#define IDT_SW_NTP6_BARUTBASE3 0x0D4ACU
> +#define IDT_SW_NTP6_BARSETUP4 0x0D4B0U
> +#define IDT_SW_NTP6_BARLIMIT4 0x0D4B4U
> +#define IDT_SW_NTP6_BARLTBASE4 0x0D4B8U
> +#define IDT_SW_NTP6_BARUTBASE4 0x0D4BCU
> +#define IDT_SW_NTP6_BARSETUP5 0x0D4C0U
> +#define IDT_SW_NTP6_BARLIMIT5 0x0D4C4U
> +#define IDT_SW_NTP6_BARLTBASE5 0x0D4C8U
> +#define IDT_SW_NTP6_BARUTBASE5 0x0D4CCU
> +/* PCI Express command/status and link control/status registers (WORD+WORD) */
> +#define IDT_SW_NTP8_PCIECMDSTS 0x11004U
> +#define IDT_SW_NTP8_PCIELCTLSTS 0x11050U
> +/* NT-function control register (DWORD) */
> +#define IDT_SW_NTP8_NTCTL 0x11400U
> +/* BAR setup/limit/base address registers (DWORD) */
> +#define IDT_SW_NTP8_BARSETUP0 0x11470U
> +#define IDT_SW_NTP8_BARLIMIT0 0x11474U
> +#define IDT_SW_NTP8_BARLTBASE0 0x11478U
> +#define IDT_SW_NTP8_BARUTBASE0 0x1147CU
> +#define IDT_SW_NTP8_BARSETUP1 0x11480U
> +#define IDT_SW_NTP8_BARLIMIT1 0x11484U
> +#define IDT_SW_NTP8_BARLTBASE1 0x11488U
> +#define IDT_SW_NTP8_BARUTBASE1 0x1148CU
> +#define IDT_SW_NTP8_BARSETUP2 0x11490U
> +#define IDT_SW_NTP8_BARLIMIT2 0x11494U
> +#define IDT_SW_NTP8_BARLTBASE2 0x11498U
> +#define IDT_SW_NTP8_BARUTBASE2 0x1149CU
> +#define IDT_SW_NTP8_BARSETUP3 0x114A0U
> +#define IDT_SW_NTP8_BARLIMIT3 0x114A4U
> +#define IDT_SW_NTP8_BARLTBASE3 0x114A8U
> +#define IDT_SW_NTP8_BARUTBASE3 0x114ACU
> +#define IDT_SW_NTP8_BARSETUP4 0x114B0U
> +#define IDT_SW_NTP8_BARLIMIT4 0x114B4U
> +#define IDT_SW_NTP8_BARLTBASE4 0x114B8U
> +#define IDT_SW_NTP8_BARUTBASE4 0x114BCU
> +#define IDT_SW_NTP8_BARSETUP5 0x114C0U
> +#define IDT_SW_NTP8_BARLIMIT5 0x114C4U
> +#define IDT_SW_NTP8_BARLTBASE5 0x114C8U
> +#define IDT_SW_NTP8_BARUTBASE5 0x114CCU
> +/* PCI Express command/status and link control/status registers (WORD+WORD) */
> +#define IDT_SW_NTP12_PCIECMDSTS 0x19004U
> +#define IDT_SW_NTP12_PCIELCTLSTS 0x19050U
> +/* NT-function control register (DWORD) */
> +#define IDT_SW_NTP12_NTCTL 0x19400U
> +/* BAR setup/limit/base address registers (DWORD) */
> +#define IDT_SW_NTP12_BARSETUP0 0x19470U
> +#define IDT_SW_NTP12_BARLIMIT0 0x19474U
> +#define IDT_SW_NTP12_BARLTBASE0 0x19478U
> +#define IDT_SW_NTP12_BARUTBASE0 0x1947CU
> +#define IDT_SW_NTP12_BARSETUP1 0x19480U
> +#define IDT_SW_NTP12_BARLIMIT1 0x19484U
> +#define IDT_SW_NTP12_BARLTBASE1 0x19488U
> +#define IDT_SW_NTP12_BARUTBASE1 0x1948CU
> +#define IDT_SW_NTP12_BARSETUP2 0x19490U
> +#define IDT_SW_NTP12_BARLIMIT2 0x19494U
> +#define IDT_SW_NTP12_BARLTBASE2 0x19498U
> +#define IDT_SW_NTP12_BARUTBASE2 0x1949CU
> +#define IDT_SW_NTP12_BARSETUP3 0x194A0U
> +#define IDT_SW_NTP12_BARLIMIT3 0x194A4U
> +#define IDT_SW_NTP12_BARLTBASE3 0x194A8U
> +#define IDT_SW_NTP12_BARUTBASE3 0x194ACU
> +#define IDT_SW_NTP12_BARSETUP4 0x194B0U
> +#define IDT_SW_NTP12_BARLIMIT4 0x194B4U
> +#define IDT_SW_NTP12_BARLTBASE4 0x194B8U
> +#define IDT_SW_NTP12_BARUTBASE4 0x194BCU
> +#define IDT_SW_NTP12_BARSETUP5 0x194C0U
> +#define IDT_SW_NTP12_BARLIMIT5 0x194C4U
> +#define IDT_SW_NTP12_BARLTBASE5 0x194C8U
> +#define IDT_SW_NTP12_BARUTBASE5 0x194CCU
> +/* PCI Express command/status and link control/status registers (WORD+WORD) */
> +#define IDT_SW_NTP16_PCIECMDSTS 0x21004U
> +#define IDT_SW_NTP16_PCIELCTLSTS 0x21050U
> +/* NT-function control register (DWORD) */
> +#define IDT_SW_NTP16_NTCTL 0x21400U
> +/* BAR setup/limit/base address registers (DWORD) */
> +#define IDT_SW_NTP16_BARSETUP0 0x21470U
> +#define IDT_SW_NTP16_BARLIMIT0 0x21474U
> +#define IDT_SW_NTP16_BARLTBASE0 0x21478U
> +#define IDT_SW_NTP16_BARUTBASE0 0x2147CU
> +#define IDT_SW_NTP16_BARSETUP1 0x21480U
> +#define IDT_SW_NTP16_BARLIMIT1 0x21484U
> +#define IDT_SW_NTP16_BARLTBASE1 0x21488U
> +#define IDT_SW_NTP16_BARUTBASE1 0x2148CU
> +#define IDT_SW_NTP16_BARSETUP2 0x21490U
> +#define IDT_SW_NTP16_BARLIMIT2 0x21494U
> +#define IDT_SW_NTP16_BARLTBASE2 0x21498U
> +#define IDT_SW_NTP16_BARUTBASE2 0x2149CU
> +#define IDT_SW_NTP16_BARSETUP3 0x214A0U
> +#define IDT_SW_NTP16_BARLIMIT3 0x214A4U
> +#define IDT_SW_NTP16_BARLTBASE3 0x214A8U
> +#define IDT_SW_NTP16_BARUTBASE3 0x214ACU
> +#define IDT_SW_NTP16_BARSETUP4 0x214B0U
> +#define IDT_SW_NTP16_BARLIMIT4 0x214B4U
> +#define IDT_SW_NTP16_BARLTBASE4 0x214B8U
> +#define IDT_SW_NTP16_BARUTBASE4 0x214BCU
> +#define IDT_SW_NTP16_BARSETUP5 0x214C0U
> +#define IDT_SW_NTP16_BARLIMIT5 0x214C4U
> +#define IDT_SW_NTP16_BARLTBASE5 0x214C8U
> +#define IDT_SW_NTP16_BARUTBASE5 0x214CCU
> +/* PCI Express command/status and link control/status registers (WORD+WORD) */
> +#define IDT_SW_NTP20_PCIECMDSTS 0x29004U
> +#define IDT_SW_NTP20_PCIELCTLSTS 0x29050U
> +/* NT-function control register (DWORD) */
> +#define IDT_SW_NTP20_NTCTL 0x29400U
> +/* BAR setup/limit/base address registers (DWORD) */
> +#define IDT_SW_NTP20_BARSETUP0 0x29470U
> +#define IDT_SW_NTP20_BARLIMIT0 0x29474U
> +#define IDT_SW_NTP20_BARLTBASE0 0x29478U
> +#define IDT_SW_NTP20_BARUTBASE0 0x2947CU
> +#define IDT_SW_NTP20_BARSETUP1 0x29480U
> +#define IDT_SW_NTP20_BARLIMIT1 0x29484U
> +#define IDT_SW_NTP20_BARLTBASE1 0x29488U
> +#define IDT_SW_NTP20_BARUTBASE1 0x2948CU
> +#define IDT_SW_NTP20_BARSETUP2 0x29490U
> +#define IDT_SW_NTP20_BARLIMIT2 0x29494U
> +#define IDT_SW_NTP20_BARLTBASE2 0x29498U
> +#define IDT_SW_NTP20_BARUTBASE2 0x2949CU
> +#define IDT_SW_NTP20_BARSETUP3 0x294A0U
> +#define IDT_SW_NTP20_BARLIMIT3 0x294A4U
> +#define IDT_SW_NTP20_BARLTBASE3 0x294A8U
> +#define IDT_SW_NTP20_BARUTBASE3 0x294ACU
> +#define IDT_SW_NTP20_BARSETUP4 0x294B0U
> +#define IDT_SW_NTP20_BARLIMIT4 0x294B4U
> +#define IDT_SW_NTP20_BARLTBASE4 0x294B8U
> +#define IDT_SW_NTP20_BARUTBASE4 0x294BCU
> +#define IDT_SW_NTP20_BARSETUP5 0x294C0U
> +#define IDT_SW_NTP20_BARLIMIT5 0x294C4U
> +#define IDT_SW_NTP20_BARLTBASE5 0x294C8U
> +#define IDT_SW_NTP20_BARUTBASE5 0x294CCU
> +/* IDT PCIe-switch control register (DWORD) */
> +#define IDT_SW_CTL 0x3E000U
> +/* Boot Configuration Vector Status (DWORD) */
> +#define IDT_SW_BCVSTS 0x3E004U
> +/* Port Clocking Mode (DWORD) */
> +#define IDT_SW_PCLKMODE 0x3E008U
> +/* Reset Drain Delay (DWORD) */
> +#define IDT_SW_RDRAINDELAY 0x3E080U
> +/* Port Operating Mode Change Drain Delay (DWORD) */
> +#define IDT_SW_POMCDELAY 0x3E084U
> +/* Side Effect Delay (DWORD) */
> +#define IDT_SW_SEDELAY 0x3E088U
> +/* Upstream Secondary Bus Reset Delay (DWORD) */
> +#define IDT_SW_SSBRDELAY 0x3E08CU
> +/* Switch partition N Control/Status/Failover registers */
> +#define IDT_SW_SWPART0CTL 0x3E100U
> +#define IDT_SW_SWPART0STS 0x3E104U
> +#define IDT_SW_SWPART0FCTL 0x3E108U
> +#define IDT_SW_SWPART1CTL 0x3E120U
> +#define IDT_SW_SWPART1STS 0x3E124U
> +#define IDT_SW_SWPART1FCTL 0x3E128U
> +#define IDT_SW_SWPART2CTL 0x3E140U
> +#define IDT_SW_SWPART2STS 0x3E144U
> +#define IDT_SW_SWPART2FCTL 0x3E148U
> +#define IDT_SW_SWPART3CTL 0x3E160U
> +#define IDT_SW_SWPART3STS 0x3E164U
> +#define IDT_SW_SWPART3FCTL 0x3E168U
> +#define IDT_SW_SWPART4CTL 0x3E180U
> +#define IDT_SW_SWPART4STS 0x3E184U
> +#define IDT_SW_SWPART4FCTL 0x3E188U
> +#define IDT_SW_SWPART5CTL 0x3E1A0U
> +#define IDT_SW_SWPART5STS 0x3E1A4U
> +#define IDT_SW_SWPART5FCTL 0x3E1A8U
> +#define IDT_SW_SWPART6CTL 0x3E1C0U
> +#define IDT_SW_SWPART6STS 0x3E1C4U
> +#define IDT_SW_SWPART6FCTL 0x3E1C8U
> +#define IDT_SW_SWPART7CTL 0x3E1E0U
> +#define IDT_SW_SWPART7STS 0x3E1E4U
> +#define IDT_SW_SWPART7FCTL 0x3E1E8U
> +/* Switch port N control and status registers */
> +#define IDT_SW_SWPORT0CTL 0x3E200U
> +#define IDT_SW_SWPORT0STS 0x3E204U
> +#define IDT_SW_SWPORT0FCTL 0x3E208U
> +#define IDT_SW_SWPORT2CTL 0x3E240U
> +#define IDT_SW_SWPORT2STS 0x3E244U
> +#define IDT_SW_SWPORT2FCTL 0x3E248U
> +#define IDT_SW_SWPORT4CTL 0x3E280U
> +#define IDT_SW_SWPORT4STS 0x3E284U
> +#define IDT_SW_SWPORT4FCTL 0x3E288U
> +#define IDT_SW_SWPORT6CTL 0x3E2C0U
> +#define IDT_SW_SWPORT6STS 0x3E2C4U
> +#define IDT_SW_SWPORT6FCTL 0x3E2C8U
> +#define IDT_SW_SWPORT8CTL 0x3E300U
> +#define IDT_SW_SWPORT8STS 0x3E304U
> +#define IDT_SW_SWPORT8FCTL 0x3E308U
> +#define IDT_SW_SWPORT12CTL 0x3E380U
> +#define IDT_SW_SWPORT12STS 0x3E384U
> +#define IDT_SW_SWPORT12FCTL 0x3E388U
> +#define IDT_SW_SWPORT16CTL 0x3E400U
> +#define IDT_SW_SWPORT16STS 0x3E404U
> +#define IDT_SW_SWPORT16FCTL 0x3E408U
> +#define IDT_SW_SWPORT20CTL 0x3E480U
> +#define IDT_SW_SWPORT20STS 0x3E484U
> +#define IDT_SW_SWPORT20FCTL 0x3E488U
> +/* Switch Event registers */
> +/* Switch Event Status/Mask/Partition mask (DWORD) */
> +#define IDT_SW_SESTS 0x3EC00U
> +#define IDT_SW_SEMSK 0x3EC04U
> +#define IDT_SW_SEPMSK 0x3EC08U
> +/* Switch Event Link Up/Down Status/Mask (DWORD) */
> +#define IDT_SW_SELINKUPSTS 0x3EC0CU
> +#define IDT_SW_SELINKUPMSK 0x3EC10U
> +#define IDT_SW_SELINKDNSTS 0x3EC14U
> +#define IDT_SW_SELINKDNMSK 0x3EC18U
> +/* Switch Event Fundamental Reset Status/Mask (DWORD) */
> +#define IDT_SW_SEFRSTSTS 0x3EC1CU
> +#define IDT_SW_SEFRSTMSK 0x3EC20U
> +/* Switch Event Hot Reset Status/Mask (DWORD) */
> +#define IDT_SW_SEHRSTSTS 0x3EC24U
> +#define IDT_SW_SEHRSTMSK 0x3EC28U
> +/* Switch Event Failover Mask (DWORD) */
> +#define IDT_SW_SEFOVRMSK 0x3EC2CU
> +/* Switch Event Global Signal Status/Mask (DWORD) */
> +#define IDT_SW_SEGSIGSTS 0x3EC30U
> +#define IDT_SW_SEGSIGMSK 0x3EC34U
> +/* NT Global Doorbell Status (DWORD) */
> +#define IDT_SW_GDBELLSTS 0x3EC3CU
> +/* Switch partition N message M control (msgs routing table) (DWORD) */
> +#define IDT_SW_SWP0MSGCTL0 0x3EE00U
> +#define IDT_SW_SWP1MSGCTL0 0x3EE04U
> +#define IDT_SW_SWP2MSGCTL0 0x3EE08U
> +#define IDT_SW_SWP3MSGCTL0 0x3EE0CU
> +#define IDT_SW_SWP4MSGCTL0 0x3EE10U
> +#define IDT_SW_SWP5MSGCTL0 0x3EE14U
> +#define IDT_SW_SWP6MSGCTL0 0x3EE18U
> +#define IDT_SW_SWP7MSGCTL0 0x3EE1CU
> +#define IDT_SW_SWP0MSGCTL1 0x3EE20U
> +#define IDT_SW_SWP1MSGCTL1 0x3EE24U
> +#define IDT_SW_SWP2MSGCTL1 0x3EE28U
> +#define IDT_SW_SWP3MSGCTL1 0x3EE2CU
> +#define IDT_SW_SWP4MSGCTL1 0x3EE30U
> +#define IDT_SW_SWP5MSGCTL1 0x3EE34U
> +#define IDT_SW_SWP6MSGCTL1 0x3EE38U
> +#define IDT_SW_SWP7MSGCTL1 0x3EE3CU
> +#define IDT_SW_SWP0MSGCTL2 0x3EE40U
> +#define IDT_SW_SWP1MSGCTL2 0x3EE44U
> +#define IDT_SW_SWP2MSGCTL2 0x3EE48U
> +#define IDT_SW_SWP3MSGCTL2 0x3EE4CU
> +#define IDT_SW_SWP4MSGCTL2 0x3EE50U
> +#define IDT_SW_SWP5MSGCTL2 0x3EE54U
> +#define IDT_SW_SWP6MSGCTL2 0x3EE58U
> +#define IDT_SW_SWP7MSGCTL2 0x3EE5CU
> +#define IDT_SW_SWP0MSGCTL3 0x3EE60U
> +#define IDT_SW_SWP1MSGCTL3 0x3EE64U
> +#define IDT_SW_SWP2MSGCTL3 0x3EE68U
> +#define IDT_SW_SWP3MSGCTL3 0x3EE6CU
> +#define IDT_SW_SWP4MSGCTL3 0x3EE70U
> +#define IDT_SW_SWP5MSGCTL3 0x3EE74U
> +#define IDT_SW_SWP6MSGCTL3 0x3EE78U
> +#define IDT_SW_SWP7MSGCTL3 0x3EE7CU
> +/* SMBus Status and Control registers (DWORD) */
> +#define IDT_SW_SMBUSSTS 0x3F188U
> +#define IDT_SW_SMBUSCTL 0x3F18CU
> +/* Serial EEPROM Interface (DWORD) */
> +#define IDT_SW_EEPROMINTF 0x3F190U
> +/* MBus I/O Expander Address N (DWORD) */
> +#define IDT_SW_IOEXPADDR0 0x3F198U
> +#define IDT_SW_IOEXPADDR1 0x3F19CU
> +#define IDT_SW_IOEXPADDR2 0x3F1A0U
> +#define IDT_SW_IOEXPADDR3 0x3F1A4U
> +#define IDT_SW_IOEXPADDR4 0x3F1A8U
> +#define IDT_SW_IOEXPADDR5 0x3F1ACU
> +/* General Purpose Events Control and Status registers (DWORD) */
> +#define IDT_SW_GPECTL 0x3F1B0U
> +#define IDT_SW_GPESTS 0x3F1B4U
> +/* Temperature sensor Control/Status/Alarm/Adjustment/Slope registers */
> +#define IDT_SW_TMPCTL 0x3F1D4U
> +#define IDT_SW_TMPSTS 0x3F1D8U
> +#define IDT_SW_TMPALARM 0x3F1DCU
> +#define IDT_SW_TMPADJ 0x3F1E0U
> +#define IDT_SW_TSSLOPE 0x3F1E4U
> +/* SMBus Configuration Block header log (DWORD) */
> +#define IDT_SW_SMBUSCBHL 0x3F1E8U
> +
> +/*
> + * Common registers related constants
> + * @IDT_REG_ALIGN: Registers alignment used in the driver
> + * @IDT_REG_PCI_MAX: Maximum PCI configuration space register value
> + * @IDT_REG_SW_MAX: Maximum global register value
> + */
> +#define IDT_REG_ALIGN 4
> +#define IDT_REG_PCI_MAX 0x00FFFU
> +#define IDT_REG_SW_MAX 0x3FFFFU
> +
> +/*
> + * PCICMDSTS register fields related constants
> + * @IDT_PCICMDSTS_IOAE: I/O access enable
> + * @IDT_PCICMDSTS_MAE: Memory access enable
> + * @IDT_PCICMDSTS_BME: Bus master enable
> + */
> +#define IDT_PCICMDSTS_IOAE 0x00000001U
> +#define IDT_PCICMDSTS_MAE 0x00000002U
> +#define IDT_PCICMDSTS_BME 0x00000004U
> +
> +/*
> + * PCIEDCAP register fields related constants
> + * @IDT_PCIEDCAP_MPAYLOAD_MASK: Maximum payload size mask
> + * @IDT_PCIEDCAP_MPAYLOAD_FLD: Maximum payload size field offset
> + * @IDT_PCIEDCAP_MPAYLOAD_S128: Max supported payload size of 128 bytes
> + * @IDT_PCIEDCAP_MPAYLOAD_S256: Max supported payload size of 256 bytes
> + * @IDT_PCIEDCAP_MPAYLOAD_S512: Max supported payload size of 512 bytes
> + * @IDT_PCIEDCAP_MPAYLOAD_S1024: Max supported payload size of 1024 bytes
> + * @IDT_PCIEDCAP_MPAYLOAD_S2048: Max supported payload size of 2048 bytes
> + */
> +#define IDT_PCIEDCAP_MPAYLOAD_MASK 0x00000007U
> +#define IDT_PCIEDCAP_MPAYLOAD_FLD 0
> +#define IDT_PCIEDCAP_MPAYLOAD_S128 0x00000000U
> +#define IDT_PCIEDCAP_MPAYLOAD_S256 0x00000001U
> +#define IDT_PCIEDCAP_MPAYLOAD_S512 0x00000002U
> +#define IDT_PCIEDCAP_MPAYLOAD_S1024 0x00000003U
> +#define IDT_PCIEDCAP_MPAYLOAD_S2048 0x00000004U
> +
> +/*
> + * PCIEDCTLSTS registers fields related constants
> + * @IDT_PCIEDCTL_MPS_MASK: Maximum payload size mask
> + * @IDT_PCIEDCTL_MPS_FLD: MPS field offset
> + * @IDT_PCIEDCTL_MPS_S128: Max payload size of 128 bytes
> + * @IDT_PCIEDCTL_MPS_S256: Max payload size of 256 bytes
> + * @IDT_PCIEDCTL_MPS_S512: Max payload size of 512 bytes
> + * @IDT_PCIEDCTL_MPS_S1024: Max payload size of 1024 bytes
> + * @IDT_PCIEDCTL_MPS_S2048: Max payload size of 2048 bytes
> + * @IDT_PCIEDCTL_MPS_S4096: Max payload size of 4096 bytes
> + */
> +#define IDT_PCIEDCTLSTS_MPS_MASK 0x000000E0U
> +#define IDT_PCIEDCTLSTS_MPS_FLD 5
> +#define IDT_PCIEDCTLSTS_MPS_S128 0x00000000U
> +#define IDT_PCIEDCTLSTS_MPS_S256 0x00000020U
> +#define IDT_PCIEDCTLSTS_MPS_S512 0x00000040U
> +#define IDT_PCIEDCTLSTS_MPS_S1024 0x00000060U
> +#define IDT_PCIEDCTLSTS_MPS_S2048 0x00000080U
> +#define IDT_PCIEDCTLSTS_MPS_S4096 0x000000A0U
> +
> +/*
> + * PCIELCAP register fields related constants
> + * @IDT_PCIELCAP_PORTNUM_MASK: Port number field mask
> + * @IDT_PCIELCAP_PORTNUM_FLD: Port number field offset
> + */
> +#define IDT_PCIELCAP_PORTNUM_MASK 0xFF000000U
> +#define IDT_PCIELCAP_PORTNUM_FLD 24
> +
> +/*
> + * PCIELCTLSTS registers fields related constants
> + * @IDT_PCIELSTS_CLS_MASK: Current link speed mask
> + * @IDT_PCIELSTS_CLS_FLD: Current link speed field offset
> + * @IDT_PCIELSTS_NLW_MASK: Negotiated link width mask
> + * @IDT_PCIELSTS_NLW_FLD: Negotiated link width field offset
> + * @IDT_PCIELSTS_SCLK_COM: Common slot clock configuration
> + */
> +#define IDT_PCIELCTLSTS_CLS_MASK 0x000F0000U
> +#define IDT_PCIELCTLSTS_CLS_FLD 16
> +#define IDT_PCIELCTLSTS_NLW_MASK 0x03F00000U
> +#define IDT_PCIELCTLSTS_NLW_FLD 20
> +#define IDT_PCIELCTLSTS_SCLK_COM 0x10000000U
> +
> +/*
> + * NTCTL register fields related constants
> + * @IDT_NTCTL_IDPROTDIS: ID Protection check disable (disable MTBL)
> + * @IDT_NTCTL_CPEN: Completion enable
> + * @IDT_NTCTL_RNS: Request no snoop processing (if MTBL disabled)
> + * @IDT_NTCTL_ATP: Address type processing (if MTBL disabled)
> + */
> +#define IDT_NTCTL_IDPROTDIS 0x00000001U
> +#define IDT_NTCTL_CPEN 0x00000002U
> +#define IDT_NTCTL_RNS 0x00000004U
> +#define IDT_NTCTL_ATP 0x00000008U
> +
> +/*
> + * NTINTSTS register fields related constants
> + * @IDT_NTINTSTS_MSG: Message interrupt bit
> + * @IDT_NTINTSTS_DBELL: Doorbell interrupt bit
> + * @IDT_NTINTSTS_SEVENT: Switch Event interrupt bit
> + * @IDT_NTINTSTS_TMPSENSOR: Temperature sensor interrupt bit
> + */
> +#define IDT_NTINTSTS_MSG 0x00000001U
> +#define IDT_NTINTSTS_DBELL 0x00000002U
> +#define IDT_NTINTSTS_SEVENT 0x00000008U
> +#define IDT_NTINTSTS_TMPSENSOR 0x00000080U
> +
> +/*
> + * NTINTMSK register fields related constants
> + * @IDT_NTINTMSK_MSG: Message interrupt mask bit
> + * @IDT_NTINTMSK_DBELL: Doorbell interrupt mask bit
> + * @IDT_NTINTMSK_SEVENT: Switch Event interrupt mask bit
> + * @IDT_NTINTMSK_TMPSENSOR: Temperature sensor interrupt mask bit
> + * @IDT_NTINTMSK_ALL: All the useful interrupts mask
> + */
> +#define IDT_NTINTMSK_MSG 0x00000001U
> +#define IDT_NTINTMSK_DBELL 0x00000002U
> +#define IDT_NTINTMSK_SEVENT 0x00000008U
> +#define IDT_NTINTMSK_TMPSENSOR 0x00000080U
> +#define IDT_NTINTMSK_ALL \
> + (IDT_NTINTMSK_MSG | IDT_NTINTMSK_DBELL | \
> + IDT_NTINTMSK_SEVENT | IDT_NTINTMSK_TMPSENSOR)
> +
> +/*
> + * NTGSIGNAL register fields related constants
> + * @IDT_NTGSIGNAL_SET: Set global signal of the local partition
> + */
> +#define IDT_NTGSIGNAL_SET 0x00000001U
> +
> +/*
> + * BARSETUP register fields related constants
> + * @IDT_BARSETUP_TYPE_MASK: Mask of the TYPE field
> + * @IDT_BARSETUP_TYPE_32: 32-bit addressing BAR
> + * @IDT_BARSETUP_TYPE_64: 64-bit addressing BAR
> + * @IDT_BARSETUP_PREF: Value of the BAR prefetchable field
> + * @IDT_BARSETUP_SIZE_MASK: Mask of the SIZE field
> + * @IDT_BARSETUP_SIZE_FLD: SIZE field offset
> + * @IDT_BARSETUP_SIZE_CFG: SIZE field value in case of config space MODE
> + * @IDT_BARSETUP_MODE_CFG: Configuration space BAR mode
> + * @IDT_BARSETUP_ATRAN_MASK: ATRAN field mask
> + * @IDT_BARSETUP_ATRAN_FLD: ATRAN field offset
> + * @IDT_BARSETUP_ATRAN_DIR: Direct address translation memory window
> + * @IDT_BARSETUP_ATRAN_LUT12: 12-entry lookup table
> + * @IDT_BARSETUP_ATRAN_LUT24: 24-entry lookup table
> + * @IDT_BARSETUP_TPART_MASK: TPART field mask
> + * @IDT_BARSETUP_TPART_FLD: TPART field offset
> + * @IDT_BARSETUP_EN: BAR enable bit
> + */
> +#define IDT_BARSETUP_TYPE_MASK 0x00000006U
> +#define IDT_BARSETUP_TYPE_FLD 0
> +#define IDT_BARSETUP_TYPE_32 0x00000000U
> +#define IDT_BARSETUP_TYPE_64 0x00000004U
> +#define IDT_BARSETUP_PREF 0x00000008U
> +#define IDT_BARSETUP_SIZE_MASK 0x000003F0U
> +#define IDT_BARSETUP_SIZE_FLD 4
> +#define IDT_BARSETUP_SIZE_CFG 0x000000C0U
> +#define IDT_BARSETUP_MODE_CFG 0x00000400U
> +#define IDT_BARSETUP_ATRAN_MASK 0x00001800U
> +#define IDT_BARSETUP_ATRAN_FLD 11
> +#define IDT_BARSETUP_ATRAN_DIR 0x00000000U
> +#define IDT_BARSETUP_ATRAN_LUT12 0x00000800U
> +#define IDT_BARSETUP_ATRAN_LUT24 0x00001000U
> +#define IDT_BARSETUP_TPART_MASK 0x0000E000U
> +#define IDT_BARSETUP_TPART_FLD 13
> +#define IDT_BARSETUP_EN 0x80000000U
> +
> +/*
> + * NTMTBLDATA register fields related constants
> + * @IDT_NTMTBLDATA_VALID: Set the MTBL entry being valid
> + * @IDT_NTMTBLDATA_REQID_MASK: Bus:Device:Function field mask
> + * @IDT_NTMTBLDATA_REQID_FLD: Bus:Device:Function field offset
> + * @IDT_NTMTBLDATA_PART_MASK: Partition field mask
> + * @IDT_NTMTBLDATA_PART_FLD: Partition field offset
> + * @IDT_NTMTBLDATA_ATP_TRANS: Enable AT field translation on request TLPs
> + * @IDT_NTMTBLDATA_CNS_INV: Enable No Snoop attribute inversion of
> + * Completion TLPs
> + * @IDT_NTMTBLDATA_RNS_INV: Enable No Snoop attribute inversion of
> + * Request TLPs
> + */
> +#define IDT_NTMTBLDATA_VALID 0x00000001U
> +#define IDT_NTMTBLDATA_REQID_MASK 0x0001FFFEU
> +#define IDT_NTMTBLDATA_REQID_FLD 1
> +#define IDT_NTMTBLDATA_PART_MASK 0x000E0000U
> +#define IDT_NTMTBLDATA_PART_FLD 17
> +#define IDT_NTMTBLDATA_ATP_TRANS 0x20000000U
> +#define IDT_NTMTBLDATA_CNS_INV 0x40000000U
> +#define IDT_NTMTBLDATA_RNS_INV 0x80000000U
> +
> +/*
> + * REQIDCAP register fields related constants
> + * @IDT_REQIDCAP_REQID_MASK: Request ID field mask
> + * @IDT_REQIDCAP_REQID_FLD: Request ID field offset
> + */
> +#define IDT_REQIDCAP_REQID_MASK 0x0000FFFFU
> +#define IDT_REQIDCAP_REQID_FLD 0
> +
> +/*
> + * LUTOFFSET register fields related constants
> + * @IDT_LUTOFFSET_INDEX_MASK: Lookup table index field mask
> + * @IDT_LUTOFFSET_INDEX_FLD: Lookup table index field offset
> + * @IDT_LUTOFFSET_BAR_MASK: Lookup table BAR select field mask
> + * @IDT_LUTOFFSET_BAR_FLD: Lookup table BAR select field offset
> + */
> +#define IDT_LUTOFFSET_INDEX_MASK 0x0000001FU
> +#define IDT_LUTOFFSET_INDEX_FLD 0
> +#define IDT_LUTOFFSET_BAR_MASK 0x00000700U
> +#define IDT_LUTOFFSET_BAR_FLD 8
> +
> +/*
> + * LUTUDATA register fields related constants
> + * @IDT_LUTUDATA_PART_MASK: Partition field mask
> + * @IDT_LUTUDATA_PART_FLD: Partition field offset
> + * @IDT_LUTUDATA_VALID: Lookup table entry valid bit
> + */
> +#define IDT_LUTUDATA_PART_MASK 0x0000000FU
> +#define IDT_LUTUDATA_PART_FLD 0
> +#define IDT_LUTUDATA_VALID 0x80000000U
> +
> +/*
> + * SWPARTxSTS register fields related constants
> + * @IDT_SWPARTxSTS_SCI: Switch partition state change initiated
> + * @IDT_SWPARTxSTS_SCC: Switch partition state change completed
> + * @IDT_SWPARTxSTS_STATE_MASK: Switch partition state mask
> + * @IDT_SWPARTxSTS_STATE_FLD: Switch partition state field offset
> + * @IDT_SWPARTxSTS_STATE_DIS: Switch partition disabled
> + * @IDT_SWPARTxSTS_STATE_ACT: Switch partition enabled
> + * @IDT_SWPARTxSTS_STATE_RES: Switch partition in reset
> + * @IDT_SWPARTxSTS_US: Switch partition has upstream port
> + * @IDT_SWPARTxSTS_USID_MASK: Switch partition upstream port ID mask
> + * @IDT_SWPARTxSTS_USID_FLD: Switch partition upstream port ID field offset
> + * @IDT_SWPARTxSTS_NT: Upstream port has NT function
> + * @IDT_SWPARTxSTS_DMA: Upstream port has DMA function
> + */
> +#define IDT_SWPARTxSTS_SCI 0x00000001U
> +#define IDT_SWPARTxSTS_SCC 0x00000002U
> +#define IDT_SWPARTxSTS_STATE_MASK 0x00000060U
> +#define IDT_SWPARTxSTS_STATE_FLD 5
> +#define IDT_SWPARTxSTS_STATE_DIS 0x00000000U
> +#define IDT_SWPARTxSTS_STATE_ACT 0x00000020U
> +#define IDT_SWPARTxSTS_STATE_RES 0x00000060U
> +#define IDT_SWPARTxSTS_US 0x00000100U
> +#define IDT_SWPARTxSTS_USID_MASK 0x00003E00U
> +#define IDT_SWPARTxSTS_USID_FLD 9
> +#define IDT_SWPARTxSTS_NT 0x00004000U
> +#define IDT_SWPARTxSTS_DMA 0x00008000U
> +
> +/*
> + * SWPORTxSTS register fields related constants
> + * @IDT_SWPORTxSTS_OMCI: Operation mode change initiated
> + * @IDT_SWPORTxSTS_OMCC: Operation mode change completed
> + * @IDT_SWPORTxSTS_LINKUP: Link up status
> + * @IDT_SWPORTxSTS_DS: Port lanes behave as downstream lanes
> + * @IDT_SWPORTxSTS_MODE_MASK: Port mode field mask
> + * @IDT_SWPORTxSTS_MODE_FLD: Port mode field offset
> + * @IDT_SWPORTxSTS_MODE_DIS: Port mode - disabled
> + * @IDT_SWPORTxSTS_MODE_DS: Port mode - downstream switch port
> + * @IDT_SWPORTxSTS_MODE_US: Port mode - upstream switch port
> + * @IDT_SWPORTxSTS_MODE_NT: Port mode - NT function
> + * @IDT_SWPORTxSTS_MODE_USNT: Port mode - upstream switch port with NTB
> + * @IDT_SWPORTxSTS_MODE_UNAT: Port mode - unattached
> + * @IDT_SWPORTxSTS_MODE_USDMA: Port mode - upstream switch port with DMA
> + * @IDT_SWPORTxSTS_MODE_USNTDMA:Port mode - upstream port with NTB and DMA
> + * @IDT_SWPORTxSTS_MODE_NTDMA: Port mode - NT function with DMA
> + * @IDT_SWPORTxSTS_SWPART_MASK: Port partition field mask
> + * @IDT_SWPORTxSTS_SWPART_FLD: Port partition field offset
> + * @IDT_SWPORTxSTS_DEVNUM_MASK: Port device number field mask
> + * @IDT_SWPORTxSTS_DEVNUM_FLD: Port device number field offset
> + */
> +#define IDT_SWPORTxSTS_OMCI 0x00000001U
> +#define IDT_SWPORTxSTS_OMCC 0x00000002U
> +#define IDT_SWPORTxSTS_LINKUP 0x00000010U
> +#define IDT_SWPORTxSTS_DS 0x00000020U
> +#define IDT_SWPORTxSTS_MODE_MASK 0x000003C0U
> +#define IDT_SWPORTxSTS_MODE_FLD 6
> +#define IDT_SWPORTxSTS_MODE_DIS 0x00000000U
> +#define IDT_SWPORTxSTS_MODE_DS 0x00000040U
> +#define IDT_SWPORTxSTS_MODE_US 0x00000080U
> +#define IDT_SWPORTxSTS_MODE_NT 0x000000C0U
> +#define IDT_SWPORTxSTS_MODE_USNT 0x00000100U
> +#define IDT_SWPORTxSTS_MODE_UNAT 0x00000140U
> +#define IDT_SWPORTxSTS_MODE_USDMA 0x00000180U
> +#define IDT_SWPORTxSTS_MODE_USNTDMA 0x000001C0U
> +#define IDT_SWPORTxSTS_MODE_NTDMA 0x00000200U
> +#define IDT_SWPORTxSTS_SWPART_MASK 0x00001C00U
> +#define IDT_SWPORTxSTS_SWPART_FLD 10
> +#define IDT_SWPORTxSTS_DEVNUM_MASK 0x001F0000U
> +#define IDT_SWPORTxSTS_DEVNUM_FLD 16
> +
> +/*
> + * SEMSK register fields related constants
> + * @IDT_SEMSK_LINKUP: Link Up event mask bit
> + * @IDT_SEMSK_LINKDN: Link Down event mask bit
> + * @IDT_SEMSK_GSIGNAL: Global Signal event mask bit
> + */
> +#define IDT_SEMSK_LINKUP 0x00000001U
> +#define IDT_SEMSK_LINKDN 0x00000002U
> +#define IDT_SEMSK_GSIGNAL 0x00000020U
> +
> +/*
> + * SWPxMSGCTL register fields related constants
> + * @IDT_SWPxMSGCTL_REG_MASK: Register select field mask
> + * @IDT_SWPxMSGCTL_REG_FLD: Register select field offset
> + * @IDT_SWPxMSGCTL_PART_MASK: Partition select field mask
> + * @IDT_SWPxMSGCTL_PART_FLD: Partition select field offset
> + */
> +#define IDT_SWPxMSGCTL_REG_MASK 0x00000003U
> +#define IDT_SWPxMSGCTL_REG_FLD 0
> +#define IDT_SWPxMSGCTL_PART_MASK 0x00000070U
> +#define IDT_SWPxMSGCTL_PART_FLD 4
> +
> +/*
> + * TMPSTS register fields related constants
> + * @IDT_TMPSTS_TEMP_MASK: Current temperature field mask
> + * @IDT_TMPSTS_TEMP_FLD: Current temperature field offset
> + */
> +#define IDT_TMPSTS_TEMP_MASK 0x000000FFU
> +#define IDT_TMPSTS_TEMP_FLD 0
> +
> +/*
> + * Helper macro to get/set the corresponding field value
> + * @GET_FIELD: Retrieve the value of the corresponding field
> + * @SET_FIELD: Set the specified field up
> + * @IS_FLD_SET: Check whether a field is set with value
> + */
> +#define GET_FIELD(field, data) \
> + (((u32)(data) & IDT_ ##field## _MASK) >> IDT_ ##field## _FLD)
> +#define SET_FIELD(field, data, value) \
> + (((u32)(data) & ~IDT_ ##field## _MASK) | \
> + ((u32)(value) << IDT_ ##field## _FLD))
> +#define IS_FLD_SET(field, data, value) \
> + (((u32)(data) & IDT_ ##field## _MASK) == IDT_ ##field## _ ##value)
> +
> +/*
> + * Useful registers masks:
> + * @IDT_DBELL_MASK: Doorbell bits mask
> + * @IDT_OUTMSG_MASK: Out messages status bits mask
> + * @IDT_INMSG_MASK: In messages status bits mask
> + * @IDT_MSG_MASK: Any message status bits mask
> + */
> +#define IDT_DBELL_MASK ((u32)0xFFFFFFFFU)
> +#define IDT_OUTMSG_MASK ((u32)0x0000000FU)
> +#define IDT_INMSG_MASK ((u32)0x000F0000U)
> +#define IDT_MSG_MASK (IDT_INMSG_MASK | IDT_OUTMSG_MASK)
> +
> +/*
> + * Number of IDT NTB resources:
> + * @IDT_MSG_CNT: Number of Message registers
> + * @IDT_BAR_CNT: Number of BARs of each port
> + * @IDT_MTBL_ENTRY_CNT: Number mapping table entries
> + */
> +#define IDT_MSG_CNT 4
> +#define IDT_BAR_CNT 6
> +#define IDT_MTBL_ENTRY_CNT 64
> +
> +/*
> + * General IDT PCIe-switch constant
> + * @IDT_MAX_NR_PORTS: Maximum number of ports per IDT PCIe-switch
> + * @IDT_MAX_NR_PARTS: Maximum number of partitions per IDT PCIe-switch
> + * @IDT_MAX_NR_PEERS: Maximum number of NT-peers per IDT PCIe-switch
> + * @IDT_MAX_NR_MWS: Maximum number of Memory Widows
> + * @IDT_PCIE_REGSIZE: Size of the registers in bytes
> + * @IDT_TRANS_ALIGN: Alignment of translated base address
> + * @IDT_DIR_SIZE_ALIGN: Alignment of size setting for direct translated MWs.
> + * Even though the lower 10 bits are reserved, they are
> + * treated by IDT as one's so basically there is no any
> + * alignment of size limit for DIR address translation.
> + */
> +#define IDT_MAX_NR_PORTS 24
> +#define IDT_MAX_NR_PARTS 8
> +#define IDT_MAX_NR_PEERS 8
> +#define IDT_MAX_NR_MWS 29
> +#define IDT_PCIE_REGSIZE 4
> +#define IDT_TRANS_ALIGN 4
> +#define IDT_DIR_SIZE_ALIGN 1
> +
> +/*
> + * IDT Memory Windows type. Depending on the device settings, IDT supports
> + * Direct Address Translation MW registers and Lookup Table registers
> + * @IDT_MW_DIR: Direct address translation
> + * @IDT_MW_LUT12: 12-entry lookup table entry
> + * @IDT_MW_LUT24: 24-entry lookup table entry
> + *
> + * NOTE These values are exactly the same as one of the BARSETUP ATRAN field
> + */
> +enum idt_mw_type {
> + IDT_MW_DIR = 0x0,
> + IDT_MW_LUT12 = 0x1,
> + IDT_MW_LUT24 = 0x2
> +};
> +
> +/*
> + * IDT PCIe-switch model private data
> + * @name: Device name
> + * @port_cnt: Total number of NT endpoint ports
> + * @ports: Port ids
> + */
> +struct idt_89hpes_cfg {
> + char *name;
> + unsigned char port_cnt;
> + unsigned char ports[];
> +};
> +
> +/*
> + * Memory window configuration structure
> + * @type: Type of the memory window (direct address translation or lookup
> + * table)
> + *
> + * @bar: PCIe BAR the memory window referenced to
> + * @idx: Index of the memory window within the BAR
> + *
> + * @addr_align: Alignment of translated address
> + * @size_align: Alignment of memory window size
> + * @size_max: Maximum size of memory window
> + */
> +struct idt_mw_cfg {
> + enum idt_mw_type type;
> +
> + unsigned char bar;
> + unsigned char idx;
> +
> + u64 addr_align;
> + u64 size_align;
> + u64 size_max;
> +};
> +
> +/*
> + * Description structure of peer IDT NT-functions:
> + * @port: NT-function port
> + * @part: NT-function partition
> + *
> + * @mw_cnt: Number of memory windows supported by NT-function
> + * @mws: Array of memory windows descriptors
> + */
> +struct idt_ntb_peer {
> + unsigned char port;
> + unsigned char part;
> +
> + unsigned char mw_cnt;
> + struct idt_mw_cfg *mws;
> +};
> +
> +/*
> + * Description structure of local IDT NT-function:
> + * @ntb: Linux NTB-device description structure
> + * @swcfg: Pointer to the structure of local IDT PCIe-switch
> + * specific cofnfigurations
> + *
> + * @port: Local NT-function port
> + * @part: Local NT-function partition
> + *
> + * @peer_cnt: Number of peers with activated NTB-function
> + * @peers: Array of peers descripting structures
> + * @port_idx_map: Map of port number -> peer index
> + * @part_idx_map: Map of partition number -> peer index
> + *
> + * @mtbl_lock: Mapping table access lock
> + *
> + * @mw_cnt: Number of memory windows supported by NT-function
> + * @mws: Array of memory windows descriptors
> + * @lut_lock: Lookup table access lock
> + *
> + * @msg_locks: Message registers mapping table lockers
> + *
> + * @cfgspc: Virtual address of the memory mapped configuration
> + * space of the NT-function
> + * @db_mask_lock: Doorbell mask register lock
> + * @msg_mask_lock: Message mask register lock
> + * @gasa_lock: GASA registers access lock
> + *
> + * @dbgfs_info: DebugFS info node
> + */
> +struct idt_ntb_dev {
> + struct ntb_dev ntb;
> + struct idt_89hpes_cfg *swcfg;
> +
> + unsigned char port;
> + unsigned char part;
> +
> + unsigned char peer_cnt;
> + struct idt_ntb_peer peers[IDT_MAX_NR_PEERS];
> + char port_idx_map[IDT_MAX_NR_PORTS];
> + char part_idx_map[IDT_MAX_NR_PARTS];
> +
> + spinlock_t mtbl_lock;
> +
> + unsigned char mw_cnt;
> + struct idt_mw_cfg *mws;
> + spinlock_t lut_lock;
> +
> + spinlock_t msg_locks[IDT_MSG_CNT];
> +
> + void __iomem *cfgspc;
> + spinlock_t db_mask_lock;
> + spinlock_t msg_mask_lock;
> + spinlock_t gasa_lock;
> +
> + struct dentry *dbgfs_info;
> +};
> +#define to_ndev_ntb(__ntb) container_of(__ntb, struct idt_ntb_dev, ntb)
> +
> +/*
> + * Descriptor of the IDT PCIe-switch BAR resources
> + * @setup: BAR setup register
> + * @limit: BAR limit register
> + * @ltbase: Lower translated base address
> + * @utbase: Upper translated base address
> + */
> +struct idt_ntb_bar {
> + unsigned int setup;
> + unsigned int limit;
> + unsigned int ltbase;
> + unsigned int utbase;
> +};
> +
> +/*
> + * Descriptor of the IDT PCIe-switch message resources
> + * @in: Inbound message register
> + * @out: Outbound message register
> + * @src: Source of inbound message register
> + */
> +struct idt_ntb_msg {
> + unsigned int in;
> + unsigned int out;
> + unsigned int src;
> +};
> +
> +/*
> + * Descriptor of the IDT PCIe-switch NT-function specific parameters in the
> + * PCI Configuration Space
> + * @bars: BARs related registers
> + * @msgs: Messaging related registers
> + */
> +struct idt_ntb_regs {
> + struct idt_ntb_bar bars[IDT_BAR_CNT];
> + struct idt_ntb_msg msgs[IDT_MSG_CNT];
> +};
> +
> +/*
> + * Descriptor of the IDT PCIe-switch port specific parameters in the
> + * Global Configuration Space
> + * @pcicmdsts: PCI command/status register
> + * @pcielctlsts: PCIe link control/status
> + *
> + * @ctl: Port control register
> + * @sts: Port status register
> + *
> + * @bars: BARs related registers
> + */
> +struct idt_ntb_port {
> + unsigned int pcicmdsts;
> + unsigned int pcielctlsts;
> + unsigned int ntctl;
> +
> + unsigned int ctl;
> + unsigned int sts;
> +
> + struct idt_ntb_bar bars[IDT_BAR_CNT];
> +};
> +
> +/*
> + * Descriptor of the IDT PCIe-switch partition specific parameters.
> + * @ctl: Partition control register in the Global Address Space
> + * @sts: Partition status register in the Global Address Space
> + * @msgctl: Messages control registers
> + */
> +struct idt_ntb_part {
> + unsigned int ctl;
> + unsigned int sts;
> + unsigned int msgctl[IDT_MSG_CNT];
> +};
> +
> +#endif /* NTB_HW_IDT_H */
> --
> 2.6.6
>

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