[PATCH 3/4] PCI: ZYNQMP PS PCIe DMA driver: Adding support for DMA driver

From: Ravi Shankar Jonnalagadda
Date: Tue Aug 08 2017 - 07:13:52 EST

Next message: Lee Jones: "Re: [PATCH v4 03/17] mfd: madera: Add common support for Cirrus Logic Madera codecs"
Previous message: Marcel Holtmann: "Re: [PATCH 0/6] In-kernel QMI handling"
In reply to: Ravi Shankar Jonnalagadda: "[PATCH 1/4] PCI:xilinx-nwl: Enable Root DMA"
Next in thread: Ravi Shankar Jonnalagadda: "[PATCH 2/4] PCI:xilinx-nwl: Correcting Styling checks"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Adding support for ZynqmMP PS PCIe EP driver.
Adding support for ZynqmMP PS PCIe Root DMA driver.
Modifying Kconfig and Makefile to add the support.
Same platform driver handles transactions for PCIe EP DMA and Root DMA

Signed-off-by: Ravi Shankar Jonnalagadda <vjonnal@xxxxxxxxxx>
---
drivers/dma/Kconfig | 12 +
drivers/dma/xilinx/Makefile | 2 +
drivers/dma/xilinx/xilinx_ps_pcie.h | 43 +
drivers/dma/xilinx/xilinx_ps_pcie_main.c | 200 ++
drivers/dma/xilinx/xilinx_ps_pcie_platform.c | 3059 ++++++++++++++++++++++++++
include/linux/dma/xilinx_ps_pcie_dma.h | 69 +
6 files changed, 3385 insertions(+)
create mode 100644 drivers/dma/xilinx/xilinx_ps_pcie.h
create mode 100644 drivers/dma/xilinx/xilinx_ps_pcie_main.c
create mode 100644 drivers/dma/xilinx/xilinx_ps_pcie_platform.c
create mode 100644 include/linux/dma/xilinx_ps_pcie_dma.h

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index fa8f9c0..e2fe4e5 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -586,6 +586,18 @@ config XILINX_ZYNQMP_DMA
help
Enable support for Xilinx ZynqMP DMA controller.

+config XILINX_PS_PCIE_DMA
+ tristate "Xilinx PS PCIe DMA support"
+ depends on (PCI && X86_64 || ARM64)
+ select DMA_ENGINE
+ help
+ Enable support for the Xilinx PS PCIe DMA engine present
+ in recent Xilinx ZynqMP chipsets.
+
+ Say Y here if you have such a chipset.
+
+ If unsure, say N.
+
config ZX_DMA
tristate "ZTE ZX DMA support"
depends on ARCH_ZX || COMPILE_TEST
diff --git a/drivers/dma/xilinx/Makefile b/drivers/dma/xilinx/Makefile
index 9e91f8f..c78ffd7 100644
--- a/drivers/dma/xilinx/Makefile
+++ b/drivers/dma/xilinx/Makefile
@@ -1,2 +1,4 @@
obj-$(CONFIG_XILINX_DMA) += xilinx_dma.o
obj-$(CONFIG_XILINX_ZYNQMP_DMA) += zynqmp_dma.o
+xilinx_ps_pcie_dma-objs := xilinx_ps_pcie_main.o xilinx_ps_pcie_platform.o
+obj-$(CONFIG_XILINX_PS_PCIE_DMA) += xilinx_ps_pcie_dma.o
diff --git a/drivers/dma/xilinx/xilinx_ps_pcie.h b/drivers/dma/xilinx/xilinx_ps_pcie.h
new file mode 100644
index 0000000..8fbfd09
--- /dev/null
+++ b/drivers/dma/xilinx/xilinx_ps_pcie.h
@@ -0,0 +1,43 @@
+/*
+ * Xilinx PS PCIe DMA Engine platform header file
+ *
+ * Copyright (C) 2010-2017 Xilinx, Inc. All rights reserved.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation
+ */
+
+#ifndef __XILINX_PS_PCIE_H
+#define __XILINX_PS_PCIE_H
+
+#include <linux/delay.h>
+#include <linux/dma-direction.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/irqreturn.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mempool.h>
+#include <linux/pci.h>
+#include <linux/property.h>
+#include <linux/platform_device.h>
+#include <linux/timer.h>
+#include <linux/dma/xilinx_ps_pcie_dma.h>
+
+/**
+ * dma_platform_driver_register - This will be invoked by module init
+ *
+ * Return: returns status of platform_driver_register
+ */
+int dma_platform_driver_register(void);
+/**
+ * dma_platform_driver_unregister - This will be invoked by module exit
+ *
+ * Return: returns void after unregustering platform driver
+ */
+void dma_platform_driver_unregister(void);
+
+#endif
diff --git a/drivers/dma/xilinx/xilinx_ps_pcie_main.c b/drivers/dma/xilinx/xilinx_ps_pcie_main.c
new file mode 100644
index 0000000..cb31512
--- /dev/null
+++ b/drivers/dma/xilinx/xilinx_ps_pcie_main.c
@@ -0,0 +1,200 @@
+/*
+ * XILINX PS PCIe driver
+ *
+ * Copyright (C) 2017 Xilinx, Inc. All rights reserved.
+ *
+ * Description
+ * PS PCIe DMA is memory mapped DMA used to execute PS to PL transfers
+ * on ZynqMP UltraScale+ Devices.
+ * This PCIe driver creates a platform device with specific platform
+ * info enabling creation of DMA device corresponding to the channel
+ * information provided in the properties
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation
+ */
+
+#include "xilinx_ps_pcie.h"
+#include "../dmaengine.h"
+
+#define DRV_MODULE_NAME "ps_pcie_dma"
+
+static int ps_pcie_dma_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent);
+static void ps_pcie_dma_remove(struct pci_dev *pdev);
+
+static u32 channel_properties_pcie_axi[] = {
+ (u32)(PCIE_AXI_DIRECTION), (u32)(NUMBER_OF_BUFFER_DESCRIPTORS),
+ (u32)(DEFAULT_DMA_QUEUES), (u32)(CHANNEL_COAELSE_COUNT),
+ (u32)(CHANNEL_POLL_TIMER_FREQUENCY) };
+
+static u32 channel_properties_axi_pcie[] = {
+ (u32)(AXI_PCIE_DIRECTION), (u32)(NUMBER_OF_BUFFER_DESCRIPTORS),
+ (u32)(DEFAULT_DMA_QUEUES), (u32)(CHANNEL_COAELSE_COUNT),
+ (u32)(CHANNEL_POLL_TIMER_FREQUENCY) };
+
+static struct property_entry generic_pcie_ep_property[] = {
+ PROPERTY_ENTRY_U32("numchannels", (u32)MAX_NUMBER_OF_CHANNELS),
+ PROPERTY_ENTRY_U32_ARRAY("ps_pcie_channel0",
+ channel_properties_pcie_axi),
+ PROPERTY_ENTRY_U32_ARRAY("ps_pcie_channel1",
+ channel_properties_axi_pcie),
+ PROPERTY_ENTRY_U32_ARRAY("ps_pcie_channel2",
+ channel_properties_pcie_axi),
+ PROPERTY_ENTRY_U32_ARRAY("ps_pcie_channel3",
+ channel_properties_axi_pcie),
+ { },
+};
+
+static const struct platform_device_info xlnx_std_platform_dev_info = {
+ .name = XLNX_PLATFORM_DRIVER_NAME,
+ .properties = generic_pcie_ep_property,
+};
+
+/**
+ * ps_pcie_dma_probe - Driver probe function
+ * @pdev: Pointer to the pci_dev structure
+ * @ent: pci device id
+ *
+ * Return: '0' on success and failure value on error
+ */
+static int ps_pcie_dma_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ int err;
+ struct platform_device *platform_dev;
+ struct platform_device_info platform_dev_info;
+
+ dev_info(&pdev->dev, "PS PCIe DMA Driver probe\n");
+
+ err = pcim_enable_device(pdev);
+ if (err) {
+ dev_err(&pdev->dev, "Cannot enable PCI device, aborting\n");
+ return err;
+ }
+
+ err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+ if (err) {
+ dev_info(&pdev->dev, "Cannot set 64 bit DMA mask\n");
+ err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+ if (err) {
+ dev_err(&pdev->dev, "DMA mask set error\n");
+ return err;
+ }
+ }
+
+ err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
+ if (err) {
+ dev_info(&pdev->dev, "Cannot set 64 bit consistent DMA mask\n");
+ err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+ if (err) {
+ dev_err(&pdev->dev, "Cannot set consistent DMA mask\n");
+ return err;
+ }
+ }
+
+ pci_set_master(pdev);
+
+ /* For Root DMA platform device will be created through device tree */
+ if (pdev->vendor == PCI_VENDOR_ID_XILINX &&
+ pdev->device == ZYNQMP_RC_DMA_DEVID)
+ return 0;
+
+ memcpy(&platform_dev_info, &xlnx_std_platform_dev_info,
+ sizeof(xlnx_std_platform_dev_info));
+
+ /* Do device specific channel configuration changes to
+ * platform_dev_info.properties if required
+ * More information on channel properties can be found
+ * at Documentation/devicetree/bindings/dma/xilinx/ps-pcie-dma.txt
+ */
+
+ platform_dev_info.parent = &pdev->dev;
+ platform_dev_info.data = &pdev;
+ platform_dev_info.size_data = sizeof(struct pci_dev **);
+
+ platform_dev = platform_device_register_full(&platform_dev_info);
+ if (IS_ERR(platform_dev)) {
+ dev_err(&pdev->dev,
+ "Cannot create platform device, aborting\n");
+ return PTR_ERR(platform_dev);
+ }
+
+ pci_set_drvdata(pdev, platform_dev);
+
+ dev_info(&pdev->dev, "PS PCIe DMA driver successfully probed\n");
+
+ return 0;
+}
+
+static struct pci_device_id ps_pcie_dma_tbl[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_XILINX, ZYNQMP_DMA_DEVID) },
+ { PCI_DEVICE(PCI_VENDOR_ID_XILINX, ZYNQMP_RC_DMA_DEVID) },
+ { }
+};
+
+static struct pci_driver ps_pcie_dma_driver = {
+ .name = DRV_MODULE_NAME,
+ .id_table = ps_pcie_dma_tbl,
+ .probe = ps_pcie_dma_probe,
+ .remove = ps_pcie_dma_remove,
+};
+
+/**
+ * ps_pcie_init - Driver init function
+ *
+ * Return: 0 on success. Non zero on failure
+ */
+static int __init ps_pcie_init(void)
+{
+ int ret;
+
+ pr_info("%s init()\n", DRV_MODULE_NAME);
+
+ ret = pci_register_driver(&ps_pcie_dma_driver);
+ if (ret)
+ return ret;
+
+ ret = dma_platform_driver_register();
+ if (ret)
+ pci_unregister_driver(&ps_pcie_dma_driver);
+
+ return ret;
+}
+
+/**
+ * ps_pcie_dma_remove - Driver remove function
+ * @pdev: Pointer to the pci_dev structure
+ *
+ * Return: void
+ */
+static void ps_pcie_dma_remove(struct pci_dev *pdev)
+{
+ struct platform_device *platform_dev;
+
+ platform_dev = (struct platform_device *)pci_get_drvdata(pdev);
+
+ if (platform_dev)
+ platform_device_unregister(platform_dev);
+}
+
+/**
+ * ps_pcie_exit - Driver exit function
+ *
+ * Return: void
+ */
+static void __exit ps_pcie_exit(void)
+{
+ pr_info("%s exit()\n", DRV_MODULE_NAME);
+
+ dma_platform_driver_unregister();
+ pci_unregister_driver(&ps_pcie_dma_driver);
+}
+
+module_init(ps_pcie_init);
+module_exit(ps_pcie_exit);
+
+MODULE_AUTHOR("Xilinx Inc");
+MODULE_DESCRIPTION("Xilinx PS PCIe DMA Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/dma/xilinx/xilinx_ps_pcie_platform.c b/drivers/dma/xilinx/xilinx_ps_pcie_platform.c
new file mode 100644
index 0000000..8f04ecf
--- /dev/null
+++ b/drivers/dma/xilinx/xilinx_ps_pcie_platform.c
@@ -0,0 +1,3059 @@
+/*
+ * XILINX PS PCIe DMA driver
+ *
+ * Copyright (C) 2017 Xilinx, Inc. All rights reserved.
+ *
+ * Description
+ * PS PCIe DMA is memory mapped DMA used to execute PS to PL transfers
+ * on ZynqMP UltraScale+ Devices
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation
+ */
+
+#include "xilinx_ps_pcie.h"
+#include "../dmaengine.h"
+
+#define PLATFORM_DRIVER_NAME "ps_pcie_pform_dma"
+#define MAX_BARS 6
+
+#define DMA_BAR_NUMBER 0
+
+#define MIN_SW_INTR_TRANSACTIONS 2
+
+#define CHANNEL_PROPERTY_LENGTH 50
+#define WORKQ_NAME_SIZE 100
+#define INTR_HANDLR_NAME_SIZE 100
+
+#define PS_PCIE_DMA_IRQ_NOSHARE 0
+
+#define MAX_COALESCE_COUNT 255
+
+#define DMA_CHANNEL_REGS_SIZE 0x80
+
+#define DMA_SRCQPTRLO_REG_OFFSET (0x00) /* Source Q pointer Lo */
+#define DMA_SRCQPTRHI_REG_OFFSET (0x04) /* Source Q pointer Hi */
+#define DMA_SRCQSZ_REG_OFFSET (0x08) /* Source Q size */
+#define DMA_SRCQLMT_REG_OFFSET (0x0C) /* Source Q limit */
+#define DMA_DSTQPTRLO_REG_OFFSET (0x10) /* Destination Q pointer Lo */
+#define DMA_DSTQPTRHI_REG_OFFSET (0x14) /* Destination Q pointer Hi */
+#define DMA_DSTQSZ_REG_OFFSET (0x18) /* Destination Q size */
+#define DMA_DSTQLMT_REG_OFFSET (0x1C) /* Destination Q limit */
+#define DMA_SSTAQPTRLO_REG_OFFSET (0x20) /* Source Status Q pointer Lo */
+#define DMA_SSTAQPTRHI_REG_OFFSET (0x24) /* Source Status Q pointer Hi */
+#define DMA_SSTAQSZ_REG_OFFSET (0x28) /* Source Status Q size */
+#define DMA_SSTAQLMT_REG_OFFSET (0x2C) /* Source Status Q limit */
+#define DMA_DSTAQPTRLO_REG_OFFSET (0x30) /* Destination Status Q pointer Lo */
+#define DMA_DSTAQPTRHI_REG_OFFSET (0x34) /* Destination Status Q pointer Hi */
+#define DMA_DSTAQSZ_REG_OFFSET (0x38) /* Destination Status Q size */
+#define DMA_DSTAQLMT_REG_OFFSET (0x3C) /* Destination Status Q limit */
+#define DMA_SRCQNXT_REG_OFFSET (0x40) /* Source Q next */
+#define DMA_DSTQNXT_REG_OFFSET (0x44) /* Destination Q next */
+#define DMA_SSTAQNXT_REG_OFFSET (0x48) /* Source Status Q next */
+#define DMA_DSTAQNXT_REG_OFFSET (0x4C) /* Destination Status Q next */
+#define DMA_SCRATCH0_REG_OFFSET (0x50) /* Scratch pad register 0 */
+
+#define DMA_PCIE_INTR_CNTRL_REG_OFFSET (0x60) /* DMA PCIe intr control reg */
+#define DMA_PCIE_INTR_STATUS_REG_OFFSET (0x64) /* DMA PCIe intr status reg */
+#define DMA_AXI_INTR_CNTRL_REG_OFFSET (0x68) /* DMA AXI intr control reg */
+#define DMA_AXI_INTR_STATUS_REG_OFFSET (0x6C) /* DMA AXI intr status reg */
+#define DMA_PCIE_INTR_ASSRT_REG_OFFSET (0x70) /* PCIe intr assert reg */
+#define DMA_AXI_INTR_ASSRT_REG_OFFSET (0x74) /* AXI intr assert register */
+#define DMA_CNTRL_REG_OFFSET (0x78) /* DMA control register */
+#define DMA_STATUS_REG_OFFSET (0x7C) /* DMA status register */
+
+#define DMA_CNTRL_RST_BIT BIT(1)
+#define DMA_CNTRL_64BIT_STAQ_ELEMSZ_BIT BIT(2)
+#define DMA_CNTRL_ENABL_BIT BIT(0)
+#define DMA_STATUS_DMA_PRES_BIT BIT(15)
+#define DMA_STATUS_DMA_RUNNING_BIT BIT(0)
+#define DMA_QPTRLO_QLOCAXI_BIT BIT(0)
+#define DMA_QPTRLO_Q_ENABLE_BIT BIT(1)
+#define DMA_INTSTATUS_DMAERR_BIT BIT(1)
+#define DMA_INTSTATUS_SGLINTR_BIT BIT(2)
+#define DMA_INTSTATUS_SWINTR_BIT BIT(3)
+#define DMA_INTCNTRL_ENABLINTR_BIT BIT(0)
+#define DMA_INTCNTRL_DMAERRINTR_BIT BIT(1)
+#define DMA_INTCNTRL_DMASGINTR_BIT BIT(2)
+#define DMA_SW_INTR_ASSRT_BIT BIT(3)
+
+#define SOURCE_CONTROL_BD_BYTE_COUNT_MASK GENMASK(23, 0)
+#define SOURCE_CONTROL_BD_LOC_AXI BIT(24)
+#define SOURCE_CONTROL_BD_EOP_BIT BIT(25)
+#define SOURCE_CONTROL_BD_INTR_BIT BIT(26)
+#define SOURCE_CONTROL_BACK_TO_BACK_PACK_BIT BIT(25)
+#define SOURCE_CONTROL_ATTRIBUTES_MASK GENMASK(31, 28)
+#define SRC_CTL_ATTRIB_BIT_SHIFT (29)
+
+#define STA_BD_COMPLETED_BIT BIT(0)
+#define STA_BD_SOURCE_ERROR_BIT BIT(1)
+#define STA_BD_DESTINATION_ERROR_BIT BIT(2)
+#define STA_BD_INTERNAL_ERROR_BIT BIT(3)
+#define STA_BD_UPPER_STATUS_NONZERO_BIT BIT(31)
+#define STA_BD_BYTE_COUNT_MASK GENMASK(30, 4)
+
+#define STA_BD_BYTE_COUNT_SHIFT 4
+
+#define DMA_INTCNTRL_SGCOLSCCNT_BIT_SHIFT (16)
+
+#define DMA_SRC_Q_LOW_BIT_SHIFT GENMASK(5, 0)
+
+#define MAX_TRANSFER_LENGTH 0x1000000
+
+#define AXI_ATTRIBUTE 0x3
+#define PCI_ATTRIBUTE 0x2
+
+#define ROOTDMA_Q_READ_ATTRIBUTE 0x8
+
+/*
+ * User Id programmed into Source Q will be copied into Status Q of Destination
+ */
+#define DEFAULT_UID 1
+
+/*
+ * DMA channel registers
+ */
+struct DMA_ENGINE_REGISTERS {
+ u32 src_q_low; /* 0x00 */
+ u32 src_q_high; /* 0x04 */
+ u32 src_q_size; /* 0x08 */
+ u32 src_q_limit; /* 0x0C */
+ u32 dst_q_low; /* 0x10 */
+ u32 dst_q_high; /* 0x14 */
+ u32 dst_q_size; /* 0x18 */
+ u32 dst_q_limit; /* 0x1c */
+ u32 stas_q_low; /* 0x20 */
+ u32 stas_q_high; /* 0x24 */
+ u32 stas_q_size; /* 0x28 */
+ u32 stas_q_limit; /* 0x2C */
+ u32 stad_q_low; /* 0x30 */
+ u32 stad_q_high; /* 0x34 */
+ u32 stad_q_size; /* 0x38 */
+ u32 stad_q_limit; /* 0x3C */
+ u32 src_q_next; /* 0x40 */
+ u32 dst_q_next; /* 0x44 */
+ u32 stas_q_next; /* 0x48 */
+ u32 stad_q_next; /* 0x4C */
+ u32 scrathc0; /* 0x50 */
+ u32 scrathc1; /* 0x54 */
+ u32 scrathc2; /* 0x58 */
+ u32 scrathc3; /* 0x5C */
+ u32 pcie_intr_cntrl; /* 0x60 */
+ u32 pcie_intr_status; /* 0x64 */
+ u32 axi_intr_cntrl; /* 0x68 */
+ u32 axi_intr_status; /* 0x6C */
+ u32 pcie_intr_assert; /* 0x70 */
+ u32 axi_intr_assert; /* 0x74 */
+ u32 dma_channel_ctrl; /* 0x78 */
+ u32 dma_channel_status; /* 0x7C */
+} __attribute__((__packed__));
+
+/**
+ * struct SOURCE_DMA_DESCRIPTOR - Source Hardware Descriptor
+ * @system_address: 64 bit buffer physical address
+ * @control_byte_count: Byte count/buffer length and control flags
+ * @user_handle: User handle gets copied to status q on completion
+ * @user_id: User id gets copied to status q of destination
+ */
+struct SOURCE_DMA_DESCRIPTOR {
+ u64 system_address;
+ u32 control_byte_count;
+ u16 user_handle;
+ u16 user_id;
+} __attribute__((__packed__));
+
+/**
+ * struct DEST_DMA_DESCRIPTOR - Destination Hardware Descriptor
+ * @system_address: 64 bit buffer physical address
+ * @control_byte_count: Byte count/buffer length and control flags
+ * @user_handle: User handle gets copied to status q on completion
+ * @reserved: Reserved field
+ */
+struct DEST_DMA_DESCRIPTOR {
+ u64 system_address;
+ u32 control_byte_count;
+ u16 user_handle;
+ u16 reserved;
+} __attribute__((__packed__));
+
+/**
+ * struct STATUS_DMA_DESCRIPTOR - Status Hardware Descriptor
+ * @status_flag_byte_count: Byte count/buffer length and status flags
+ * @user_handle: User handle gets copied from src/dstq on completion
+ * @user_id: User id gets copied from srcq
+ */
+struct STATUS_DMA_DESCRIPTOR {
+ u32 status_flag_byte_count;
+ u16 user_handle;
+ u16 user_id;
+} __attribute__((__packed__));
+
+enum PACKET_CONTEXT_AVAILABILITY {
+ FREE = 0, /*Packet transfer Parameter context is free.*/
+ IN_USE /*Packet transfer Parameter context is in use.*/
+};
+
+struct ps_pcie_transfer_elements {
+ struct scatterlist *src_sgl;
+ unsigned int srcq_num_elemets;
+ struct scatterlist *dst_sgl;
+ unsigned int dstq_num_elemets;
+};
+
+struct ps_pcie_tx_segment {
+ struct list_head node;
+ struct dma_async_tx_descriptor async_tx;
+ struct ps_pcie_transfer_elements tx_elements;
+};
+
+struct ps_pcie_intr_segment {
+ struct list_head node;
+ struct dma_async_tx_descriptor async_intr_tx;
+};
+
+/*
+ * The context structure stored for each DMA transaction
+ * This structure is maintained separately for Src Q and Destination Q
+ * @availability_status: Indicates whether packet context is available
+ * @idx_sop: Indicates starting index of buffer descriptor for a transfer
+ * @idx_eop: Indicates ending index of buffer descriptor for a transfer
+ * @sgl: Indicates either src or dst sglist for the transaction
+ */
+struct PACKET_TRANSFER_PARAMS {
+ enum PACKET_CONTEXT_AVAILABILITY availability_status;
+ u16 idx_sop;
+ u16 idx_eop;
+ struct scatterlist *sgl;
+ struct ps_pcie_tx_segment *seg;
+ u32 requested_bytes;
+};
+
+enum CHANNEL_STATE {
+ CHANNEL_RESOURCE_UNALLOCATED = 0, /* Channel resources not allocated */
+ CHANNEL_UNAVIALBLE, /* Channel inactive */
+ CHANNEL_AVAILABLE, /* Channel available for transfers */
+ CHANNEL_ERROR /* Channel encountered errors */
+};
+
+enum BUFFER_LOCATION {
+ BUFFER_LOC_PCI = 0,
+ BUFFER_LOC_AXI,
+ BUFFER_LOC_INVALID
+};
+
+enum dev_channel_properties {
+ DMA_CHANNEL_DIRECTION = 0,
+ NUM_DESCRIPTORS,
+ NUM_QUEUES,
+ COALESE_COUNT,
+ POLL_TIMER_FREQUENCY
+};
+
+/*
+ * struct ps_pcie_dma_chan - Driver specific DMA channel structure
+ * @xdev: Driver specific device structure
+ * @dev: The dma device
+ * @common: DMA common channel
+ * @chan_base: Pointer to Channel registers
+ * @channel_number: DMA channel number in the device
+ * @num_queues: Number of queues per channel.
+ * It should be four for memory mapped case and
+ * two for Streaming case
+ * @direction: Transfer direction
+ * @state: Indicates channel state
+ * @channel_lock: Spin lock to be used before changing channel state
+ * @cookie_lock: Spin lock to be used before assigning cookie for a transaction
+ * @coalesceCount: Indicates number of packet transfers before interrupts
+ * @poll_timer_freq:Indicates frequency of polling for completed transactions
+ * @poll_timer: Timer to poll dma buffer descriptors if coalesce count is > 0
+ * @src_avail_descriptors: Available sgl source descriptors
+ * @src_desc_lock: Lock for synchronizing src_avail_descriptors
+ * @dst_avail_descriptors: Available sgl destination descriptors
+ * @dst_desc_lock: Lock for synchronizing
+ * dst_avail_descriptors
+ * @src_sgl_bd_pa: Physical address of Source SGL buffer Descriptors
+ * @psrc_sgl_bd: Virtual address of Source SGL buffer Descriptors
+ * @src_sgl_freeidx: Holds index of Source SGL buffer descriptor to be filled
+ * @sglDestinationQLock:Lock to serialize Destination Q updates
+ * @dst_sgl_bd_pa: Physical address of Dst SGL buffer Descriptors
+ * @pdst_sgl_bd: Virtual address of Dst SGL buffer Descriptors
+ * @dst_sgl_freeidx: Holds index of Destination SGL
+ * @src_sta_bd_pa: Physical address of StatusQ buffer Descriptors
+ * @psrc_sta_bd: Virtual address of Src StatusQ buffer Descriptors
+ * @src_staprobe_idx: Holds index of Status Q to be examined for SrcQ updates
+ * @src_sta_hw_probe_idx: Holds index of maximum limit of Status Q for hardware
+ * @dst_sta_bd_pa: Physical address of Dst StatusQ buffer Descriptor
+ * @pdst_sta_bd: Virtual address of Dst Status Q buffer Descriptors
+ * @dst_staprobe_idx: Holds index of Status Q to be examined for updates
+ * @dst_sta_hw_probe_idx: Holds index of max limit of Dst Status Q for hardware
+ * @@read_attribute: Describes the attributes of buffer in srcq
+ * @@write_attribute: Describes the attributes of buffer in dstq
+ * @@intr_status_offset: Register offset to be cheked on receiving interrupt
+ * @@intr_status_offset: Register offset to be used to control interrupts
+ * @ppkt_ctx_srcq: Virtual address of packet context to Src Q updates
+ * @idx_ctx_srcq_head: Holds index of packet context to be filled for Source Q
+ * @idx_ctx_srcq_tail: Holds index of packet context to be examined for Source Q
+ * @ppkt_ctx_dstq: Virtual address of packet context to Dst Q updates
+ * @idx_ctx_dstq_head: Holds index of packet context to be filled for Dst Q
+ * @idx_ctx_dstq_tail: Holds index of packet context to be examined for Dst Q
+ * @pending_list_lock: Lock to be taken before updating pending transfers list
+ * @pending_list: List of transactions submitted to channel
+ * @active_list_lock: Lock to be taken before transferring transactions from
+ * pending list to active list which will be subsequently
+ * submitted to hardware
+ * @active_list: List of transactions that will be submitted to hardware
+ * @pending_interrupts_lock: Lock to be taken before updating pending Intr list
+ * @pending_interrupts_list: List of interrupt transactions submitted to channel
+ * @active_interrupts_lock: Lock to be taken before transferring transactions
+ * from pending interrupt list to active interrupt list
+ * @active_interrupts_list: List of interrupt transactions that are active
+ * @transactions_pool: Mem pool to allocate dma transactions quickly
+ * @intr_transactions_pool: Mem pool to allocate interrupt transactions quickly
+ * @sw_intrs_wrkq: Work Q which performs handling of software intrs
+ * @handle_sw_intrs:Work function handling software interrupts
+ * @maintenance_workq: Work Q to perform maintenance tasks during stop or error
+ * @handle_chan_reset: Work that invokes channel reset function
+ * @handle_chan_shutdown: Work that invokes channel shutdown function
+ * @handle_chan_terminate: Work that invokes channel transactions termination
+ * @chan_shutdown_complt: Completion variable which says shutdown is done
+ * @chan_terminate_complete: Completion variable which says terminate is done
+ * @primary_desc_cleanup: Work Q which performs work related to sgl handling
+ * @handle_primary_desc_cleanup: Work that invokes src Q, dst Q cleanup
+ * and programming
+ * @chan_programming: Work Q which performs work related to channel programming
+ * @handle_chan_programming: Work that invokes channel programming function
+ * @srcq_desc_cleanup: Work Q which performs src Q descriptor cleanup
+ * @handle_srcq_desc_cleanup: Work function handling Src Q completions
+ * @dstq_desc_cleanup: Work Q which performs dst Q descriptor cleanup
+ * @handle_dstq_desc_cleanup: Work function handling Dst Q completions
+ * @srcq_work_complete: Src Q Work completion variable for primary work
+ * @dstq_work_complete: Dst Q Work completion variable for primary work
+ */
+struct ps_pcie_dma_chan {
+ struct xlnx_pcie_dma_device *xdev;
+ struct device *dev;
+
+ struct dma_chan common;
+
+ struct DMA_ENGINE_REGISTERS *chan_base;
+ u16 channel_number;
+
+ u32 num_queues;
+ enum dma_data_direction direction;
+ enum BUFFER_LOCATION srcq_buffer_location;
+ enum BUFFER_LOCATION dstq_buffer_location;
+
+ u32 total_descriptors;
+
+ enum CHANNEL_STATE state;
+ spinlock_t channel_lock; /* For changing channel state */
+
+ spinlock_t cookie_lock; /* For acquiring cookie from dma framework*/
+
+ u32 coalesce_count;
+ u32 poll_timer_freq;
+
+ struct timer_list poll_timer;
+
+ u32 src_avail_descriptors;
+ spinlock_t src_desc_lock; /* For handling srcq available descriptors */
+
+ u32 dst_avail_descriptors;
+ spinlock_t dst_desc_lock; /* For handling dstq available descriptors */
+
+ dma_addr_t src_sgl_bd_pa;
+ struct SOURCE_DMA_DESCRIPTOR *psrc_sgl_bd;
+ u32 src_sgl_freeidx;
+
+ dma_addr_t dst_sgl_bd_pa;
+ struct DEST_DMA_DESCRIPTOR *pdst_sgl_bd;
+ u32 dst_sgl_freeidx;
+
+ dma_addr_t src_sta_bd_pa;
+ struct STATUS_DMA_DESCRIPTOR *psrc_sta_bd;
+ u32 src_staprobe_idx;
+ u32 src_sta_hw_probe_idx;
+
+ dma_addr_t dst_sta_bd_pa;
+ struct STATUS_DMA_DESCRIPTOR *pdst_sta_bd;
+ u32 dst_staprobe_idx;
+ u32 dst_sta_hw_probe_idx;
+
+ u32 read_attribute;
+ u32 write_attribute;
+
+ u32 intr_status_offset;
+ u32 intr_control_offset;
+
+ struct PACKET_TRANSFER_PARAMS *ppkt_ctx_srcq;
+ u16 idx_ctx_srcq_head;
+ u16 idx_ctx_srcq_tail;
+
+ struct PACKET_TRANSFER_PARAMS *ppkt_ctx_dstq;
+ u16 idx_ctx_dstq_head;
+ u16 idx_ctx_dstq_tail;
+
+ spinlock_t pending_list_lock; /* For handling dma pending_list */
+ struct list_head pending_list;
+ spinlock_t active_list_lock; /* For handling dma active_list */
+ struct list_head active_list;
+
+ spinlock_t pending_interrupts_lock; /* For dma pending interrupts list*/
+ struct list_head pending_interrupts_list;
+ spinlock_t active_interrupts_lock; /* For dma active interrupts list*/
+ struct list_head active_interrupts_list;
+
+ mempool_t *transactions_pool;
+ mempool_t *intr_transactions_pool;
+
+ struct workqueue_struct *sw_intrs_wrkq;
+ struct work_struct handle_sw_intrs;
+
+ struct workqueue_struct *maintenance_workq;
+ struct work_struct handle_chan_reset;
+ struct work_struct handle_chan_shutdown;
+ struct work_struct handle_chan_terminate;
+
+ struct completion chan_shutdown_complt;
+ struct completion chan_terminate_complete;
+
+ struct workqueue_struct *primary_desc_cleanup;
+ struct work_struct handle_primary_desc_cleanup;
+
+ struct workqueue_struct *chan_programming;
+ struct work_struct handle_chan_programming;
+
+ struct workqueue_struct *srcq_desc_cleanup;
+ struct work_struct handle_srcq_desc_cleanup;
+ struct completion srcq_work_complete;
+
+ struct workqueue_struct *dstq_desc_cleanup;
+ struct work_struct handle_dstq_desc_cleanup;
+ struct completion dstq_work_complete;
+};
+
+/*
+ * struct xlnx_pcie_dma_device - Driver specific platform device structure
+ * @is_rootdma: Indicates whether the dma instance is root port dma
+ * @dma_buf_ext_addr: Indicates whether target system is 32 bit or 64 bit
+ * @bar_mask: Indicates available pcie bars
+ * @board_number: Count value of platform device
+ * @dev: Device structure pointer for pcie device
+ * @channels: Pointer to device DMA channels structure
+ * @common: DMA device structure
+ * @num_channels: Number of channels active for the device
+ * @reg_base: Base address of first DMA channel of the device
+ * @irq_vecs: Number of irq vectors allocated to pci device
+ * @pci_dev: Parent pci device which created this platform device
+ * @bar_info: PCIe bar related information
+ * @platform_irq_vec: Platform irq vector number for root dma
+ * @rootdma_vendor: PCI Vendor id for root dma
+ * @rootdma_device: PCI Device id for root dma
+ */
+struct xlnx_pcie_dma_device {
+ bool is_rootdma;
+ bool dma_buf_ext_addr;
+ u32 bar_mask;
+ u16 board_number;
+ struct device *dev;
+ struct ps_pcie_dma_chan *channels;
+ struct dma_device common;
+ int num_channels;
+ int irq_vecs;
+ void __iomem *reg_base;
+ struct pci_dev *pci_dev;
+ struct BAR_PARAMS bar_info[MAX_BARS];
+ int platform_irq_vec;
+ u16 rootdma_vendor;
+ u16 rootdma_device;
+};
+
+#define to_xilinx_chan(chan) \
+ container_of(chan, struct ps_pcie_dma_chan, common)
+#define to_ps_pcie_dma_tx_descriptor(tx) \
+ container_of(tx, struct ps_pcie_tx_segment, async_tx)
+#define to_ps_pcie_dma_tx_intr_descriptor(tx) \
+ container_of(tx, struct ps_pcie_intr_segment, async_intr_tx)
+
+/* Function Protypes */
+static u32 ps_pcie_dma_read(struct ps_pcie_dma_chan *chan, u32 reg);
+static void ps_pcie_dma_write(struct ps_pcie_dma_chan *chan, u32 reg,
+ u32 value);
+static void ps_pcie_dma_clr_mask(struct ps_pcie_dma_chan *chan, u32 reg,
+ u32 mask);
+static void ps_pcie_dma_set_mask(struct ps_pcie_dma_chan *chan, u32 reg,
+ u32 mask);
+static int irq_setup(struct xlnx_pcie_dma_device *xdev);
+static int platform_irq_setup(struct xlnx_pcie_dma_device *xdev);
+static int chan_intr_setup(struct xlnx_pcie_dma_device *xdev);
+static int device_intr_setup(struct xlnx_pcie_dma_device *xdev);
+static int irq_probe(struct xlnx_pcie_dma_device *xdev);
+static int ps_pcie_check_intr_status(struct ps_pcie_dma_chan *chan);
+static irqreturn_t ps_pcie_dma_dev_intr_handler(int irq, void *data);
+static irqreturn_t ps_pcie_dma_chan_intr_handler(int irq, void *data);
+static int init_hw_components(struct ps_pcie_dma_chan *chan);
+static int init_sw_components(struct ps_pcie_dma_chan *chan);
+static void update_channel_read_attribute(struct ps_pcie_dma_chan *chan);
+static void update_channel_write_attribute(struct ps_pcie_dma_chan *chan);
+static void ps_pcie_chan_reset(struct ps_pcie_dma_chan *chan);
+static void poll_completed_transactions(unsigned long arg);
+static bool check_descriptors_for_two_queues(struct ps_pcie_dma_chan *chan,
+ struct ps_pcie_tx_segment *seg);
+static bool check_descriptors_for_all_queues(struct ps_pcie_dma_chan *chan,
+ struct ps_pcie_tx_segment *seg);
+static bool check_descriptor_availability(struct ps_pcie_dma_chan *chan,
+ struct ps_pcie_tx_segment *seg);
+static void handle_error(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_update_srcq(struct ps_pcie_dma_chan *chan,
+ struct ps_pcie_tx_segment *seg);
+static void xlnx_ps_pcie_update_dstq(struct ps_pcie_dma_chan *chan,
+ struct ps_pcie_tx_segment *seg);
+static void ps_pcie_chan_program_work(struct work_struct *work);
+static void dst_cleanup_work(struct work_struct *work);
+static void src_cleanup_work(struct work_struct *work);
+static void ps_pcie_chan_primary_work(struct work_struct *work);
+static int probe_channel_properties(struct platform_device *platform_dev,
+ struct xlnx_pcie_dma_device *xdev,
+ u16 channel_number);
+static void xlnx_ps_pcie_destroy_mempool(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_free_worker_queues(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_free_pkt_ctxts(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_free_descriptors(struct ps_pcie_dma_chan *chan);
+static int xlnx_ps_pcie_channel_activate(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_channel_quiesce(struct ps_pcie_dma_chan *chan);
+static void ivk_cbk_for_pending(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_reset_channel(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_free_poll_timer(struct ps_pcie_dma_chan *chan);
+static int xlnx_ps_pcie_alloc_poll_timer(struct ps_pcie_dma_chan *chan);
+static void terminate_transactions_work(struct work_struct *work);
+static void chan_shutdown_work(struct work_struct *work);
+static void chan_reset_work(struct work_struct *work);
+static int xlnx_ps_pcie_alloc_worker_threads(struct ps_pcie_dma_chan *chan);
+static int xlnx_ps_pcie_alloc_mempool(struct ps_pcie_dma_chan *chan);
+static int xlnx_ps_pcie_alloc_pkt_contexts(struct ps_pcie_dma_chan *chan);
+static int dma_alloc_descriptors_two_queues(struct ps_pcie_dma_chan *chan);
+static int dma_alloc_decriptors_all_queues(struct ps_pcie_dma_chan *chan);
+static void xlnx_ps_pcie_dma_free_chan_resources(struct dma_chan *dchan);
+static int xlnx_ps_pcie_dma_alloc_chan_resources(struct dma_chan *dchan);
+static dma_cookie_t xilinx_dma_tx_submit(struct dma_async_tx_descriptor *tx);
+static dma_cookie_t xilinx_intr_tx_submit(struct dma_async_tx_descriptor *tx);
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_dma_sg(
+ struct dma_chan *channel, struct scatterlist *dst_sg,
+ unsigned int dst_nents, struct scatterlist *src_sg,
+ unsigned int src_nents, unsigned long flags);
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_slave_sg(
+ struct dma_chan *channel, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_transfer_direction direction,
+ unsigned long flags, void *context);
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_interrupt(
+ struct dma_chan *channel, unsigned long flags);
+static void xlnx_ps_pcie_dma_issue_pending(struct dma_chan *channel);
+static int xlnx_ps_pcie_dma_terminate_all(struct dma_chan *channel);
+static int read_rootdma_config(struct platform_device *platform_dev,
+ struct xlnx_pcie_dma_device *xdev);
+static int read_epdma_config(struct platform_device *platform_dev,
+ struct xlnx_pcie_dma_device *xdev);
+static int xlnx_pcie_dma_driver_probe(struct platform_device *platform_dev);
+static int xlnx_pcie_dma_driver_remove(struct platform_device *platform_dev);
+
+/* IO accessors */
+static inline u32 ps_pcie_dma_read(struct ps_pcie_dma_chan *chan, u32 reg)
+{
+ return ioread32((void __iomem *)((char *)(chan->chan_base) + reg));
+}
+
+static inline void ps_pcie_dma_write(struct ps_pcie_dma_chan *chan, u32 reg,
+ u32 value)
+{
+ iowrite32(value, (void __iomem *)((char *)(chan->chan_base) + reg));
+}
+
+static inline void ps_pcie_dma_clr_mask(struct ps_pcie_dma_chan *chan, u32 reg,
+ u32 mask)
+{
+ ps_pcie_dma_write(chan, reg, ps_pcie_dma_read(chan, reg) & ~mask);
+}
+
+static inline void ps_pcie_dma_set_mask(struct ps_pcie_dma_chan *chan, u32 reg,
+ u32 mask)
+{
+ ps_pcie_dma_write(chan, reg, ps_pcie_dma_read(chan, reg) | mask);
+}
+
+/**
+ * ps_pcie_dma_dev_intr_handler - This will be invoked for MSI/Legacy interrupts
+ *
+ * @irq: IRQ number
+ * @data: Pointer to the PS PCIe DMA channel structure
+ *
+ * Return: IRQ_HANDLED/IRQ_NONE
+ */
+static irqreturn_t ps_pcie_dma_dev_intr_handler(int irq, void *data)
+{
+ struct xlnx_pcie_dma_device *xdev =
+ (struct xlnx_pcie_dma_device *)data;
+ struct ps_pcie_dma_chan *chan = NULL;
+ int i;
+ int err = -1;
+ int ret = -1;
+
+ for (i = 0; i < xdev->num_channels; i++) {
+ chan = &xdev->channels[i];
+ err = ps_pcie_check_intr_status(chan);
+ if (err == 0)
+ ret = 0;
+ }
+
+ return (ret == 0) ? IRQ_HANDLED : IRQ_NONE;
+}
+
+/**
+ * ps_pcie_dma_chan_intr_handler - This will be invoked for MSI-X interrupts
+ *
+ * @irq: IRQ number
+ * @data: Pointer to the PS PCIe DMA channel structure
+ *
+ * Return: IRQ_HANDLED
+ */
+static irqreturn_t ps_pcie_dma_chan_intr_handler(int irq, void *data)
+{
+ struct ps_pcie_dma_chan *chan = (struct ps_pcie_dma_chan *)data;
+
+ ps_pcie_check_intr_status(chan);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * chan_intr_setup - Requests Interrupt handler for individual channels
+ *
+ * @xdev: Driver specific data for device
+ *
+ * Return: 0 on success and non zero value on failure.
+ */
+static int chan_intr_setup(struct xlnx_pcie_dma_device *xdev)
+{
+ struct ps_pcie_dma_chan *chan;
+ int i;
+ int err = 0;
+
+ for (i = 0; i < xdev->num_channels; i++) {
+ chan = &xdev->channels[i];
+ err = devm_request_irq(xdev->dev,
+ pci_irq_vector(xdev->pci_dev, i),
+ ps_pcie_dma_chan_intr_handler,
+ PS_PCIE_DMA_IRQ_NOSHARE,
+ "PS PCIe DMA Chan Intr handler", chan);
+ if (err) {
+ dev_err(xdev->dev,
+ "Irq %d for chan %d error %d\n",
+ pci_irq_vector(xdev->pci_dev, i),
+ chan->channel_number, err);
+ break;
+ }
+ }
+
+ if (err) {
+ while (--i >= 0) {
+ chan = &xdev->channels[i];
+ devm_free_irq(xdev->dev,
+ pci_irq_vector(xdev->pci_dev, i), chan);
+ }
+ }
+
+ return err;
+}
+
+/**
+ * device_intr_setup - Requests interrupt handler for DMA device
+ *
+ * @xdev: Driver specific data for device
+ *
+ * Return: 0 on success and non zero value on failure.
+ */
+static int device_intr_setup(struct xlnx_pcie_dma_device *xdev)
+{
+ int err;
+ unsigned long intr_flags = IRQF_SHARED;
+
+ if (xdev->pci_dev->msix_enabled || xdev->pci_dev->msi_enabled)
+ intr_flags = PS_PCIE_DMA_IRQ_NOSHARE;
+
+ err = devm_request_irq(xdev->dev,
+ pci_irq_vector(xdev->pci_dev, 0),
+ ps_pcie_dma_dev_intr_handler,
+ intr_flags,
+ "PS PCIe DMA Intr Handler", xdev);
+ if (err)
+ dev_err(xdev->dev, "Couldn't request irq %d\n",
+ pci_irq_vector(xdev->pci_dev, 0));
+
+ return err;
+}
+
+/**
+ * irq_setup - Requests interrupts based on the interrupt type detected
+ *
+ * @xdev: Driver specific data for device
+ *
+ * Return: 0 on success and non zero value on failure.
+ */
+static int irq_setup(struct xlnx_pcie_dma_device *xdev)
+{
+ int err;
+
+ if (xdev->irq_vecs == xdev->num_channels)
+ err = chan_intr_setup(xdev);
+ else
+ err = device_intr_setup(xdev);
+
+ return err;
+}
+
+static int platform_irq_setup(struct xlnx_pcie_dma_device *xdev)
+{
+ int err;
+
+ err = devm_request_irq(xdev->dev,
+ xdev->platform_irq_vec,
+ ps_pcie_dma_dev_intr_handler,
+ IRQF_SHARED,
+ "PS PCIe Root DMA Handler", xdev);
+ if (err)
+ dev_err(xdev->dev, "Couldn't request irq %d\n",
+ xdev->platform_irq_vec);
+
+ return err;
+}
+
+/**
+ * irq_probe - Checks which interrupt types can be serviced by hardware
+ *
+ * @xdev: Driver specific data for device
+ *
+ * Return: Number of interrupt vectors when successful or -ENOSPC on failure
+ */
+static int irq_probe(struct xlnx_pcie_dma_device *xdev)
+{
+ struct pci_dev *pdev;
+
+ pdev = xdev->pci_dev;
+
+ xdev->irq_vecs = pci_alloc_irq_vectors(pdev, 1, xdev->num_channels,
+ PCI_IRQ_ALL_TYPES);
+ return xdev->irq_vecs;
+}
+
+/**
+ * ps_pcie_check_intr_status - Checks channel interrupt status
+ *
+ * @chan: Pointer to the PS PCIe DMA channel structure
+ *
+ * Return: 0 if interrupt is pending on channel
+ * -1 if no interrupt is pending on channel
+ */
+static int ps_pcie_check_intr_status(struct ps_pcie_dma_chan *chan)
+{
+ int err = -1;
+ u32 status;
+
+ if (chan->state != CHANNEL_AVAILABLE)
+ return err;
+
+ status = ps_pcie_dma_read(chan, chan->intr_status_offset);
+
+ if (status & DMA_INTSTATUS_SGLINTR_BIT) {
+ if (chan->primary_desc_cleanup) {
+ queue_work(chan->primary_desc_cleanup,
+ &chan->handle_primary_desc_cleanup);
+ }
+ /* Clearing Persistent bit */
+ ps_pcie_dma_set_mask(chan, chan->intr_status_offset,
+ DMA_INTSTATUS_SGLINTR_BIT);
+ err = 0;
+ }
+
+ if (status & DMA_INTSTATUS_SWINTR_BIT) {
+ if (chan->sw_intrs_wrkq)
+ queue_work(chan->sw_intrs_wrkq, &chan->handle_sw_intrs);
+ /* Clearing Persistent bit */
+ ps_pcie_dma_set_mask(chan, chan->intr_status_offset,
+ DMA_INTSTATUS_SWINTR_BIT);
+ err = 0;
+ }
+
+ if (status & DMA_INTSTATUS_DMAERR_BIT) {
+ dev_err(chan->dev,
+ "DMA Channel %d ControlStatus Reg: 0x%x",
+ chan->channel_number, status);
+ dev_err(chan->dev,
+ "Chn %d SrcQLmt = %d SrcQSz = %d SrcQNxt = %d",
+ chan->channel_number,
+ chan->chan_base->src_q_limit,
+ chan->chan_base->src_q_size,
+ chan->chan_base->src_q_next);
+ dev_err(chan->dev,
+ "Chn %d SrcStaLmt = %d SrcStaSz = %d SrcStaNxt = %d",
+ chan->channel_number,
+ chan->chan_base->stas_q_limit,
+ chan->chan_base->stas_q_size,
+ chan->chan_base->stas_q_next);
+ dev_err(chan->dev,
+ "Chn %d DstQLmt = %d DstQSz = %d DstQNxt = %d",
+ chan->channel_number,
+ chan->chan_base->dst_q_limit,
+ chan->chan_base->dst_q_size,
+ chan->chan_base->dst_q_next);
+ dev_err(chan->dev,
+ "Chan %d DstStaLmt = %d DstStaSz = %d DstStaNxt = %d",
+ chan->channel_number,
+ chan->chan_base->stad_q_limit,
+ chan->chan_base->stad_q_size,
+ chan->chan_base->stad_q_next);
+ /* Clearing Persistent bit */
+ ps_pcie_dma_set_mask(chan, chan->intr_status_offset,
+ DMA_INTSTATUS_DMAERR_BIT);
+
+ handle_error(chan);
+
+ err = 0;
+ }
+
+ return err;
+}
+
+static int init_hw_components(struct ps_pcie_dma_chan *chan)
+{
+ if (chan->psrc_sgl_bd && chan->psrc_sta_bd) {
+ /* Programming SourceQ and StatusQ bd addresses */
+ chan->chan_base->src_q_next = 0;
+ chan->chan_base->src_q_high =
+ upper_32_bits(chan->src_sgl_bd_pa);
+ chan->chan_base->src_q_size = chan->total_descriptors;
+ chan->chan_base->src_q_limit = 0;
+ if (chan->xdev->is_rootdma) {
+ chan->chan_base->src_q_low = ROOTDMA_Q_READ_ATTRIBUTE
+ | DMA_QPTRLO_QLOCAXI_BIT;
+ } else {
+ chan->chan_base->src_q_low = 0;
+ }
+ chan->chan_base->src_q_low |=
+ (lower_32_bits((chan->src_sgl_bd_pa))
+ & ~(DMA_SRC_Q_LOW_BIT_SHIFT))
+ | DMA_QPTRLO_Q_ENABLE_BIT;
+
+ chan->chan_base->stas_q_next = 0;
+ chan->chan_base->stas_q_high =
+ upper_32_bits(chan->src_sta_bd_pa);
+ chan->chan_base->stas_q_size = chan->total_descriptors;
+ chan->chan_base->stas_q_limit = chan->total_descriptors - 1;
+ if (chan->xdev->is_rootdma) {
+ chan->chan_base->stas_q_low = ROOTDMA_Q_READ_ATTRIBUTE
+ | DMA_QPTRLO_QLOCAXI_BIT;
+ } else {
+ chan->chan_base->stas_q_low = 0;
+ }
+ chan->chan_base->stas_q_low |=
+ (lower_32_bits(chan->src_sta_bd_pa)
+ & ~(DMA_SRC_Q_LOW_BIT_SHIFT))
+ | DMA_QPTRLO_Q_ENABLE_BIT;
+ }
+
+ if (chan->pdst_sgl_bd && chan->pdst_sta_bd) {
+ /* Programming DestinationQ and StatusQ buffer descriptors */
+ chan->chan_base->dst_q_next = 0;
+ chan->chan_base->dst_q_high =
+ upper_32_bits(chan->dst_sgl_bd_pa);
+ chan->chan_base->dst_q_size = chan->total_descriptors;
+ chan->chan_base->dst_q_limit = 0;
+ if (chan->xdev->is_rootdma) {
+ chan->chan_base->dst_q_low = ROOTDMA_Q_READ_ATTRIBUTE
+ | DMA_QPTRLO_QLOCAXI_BIT;
+ } else {
+ chan->chan_base->dst_q_low = 0;
+ }
+ chan->chan_base->dst_q_low |=
+ (lower_32_bits(chan->dst_sgl_bd_pa)
+ & ~(DMA_SRC_Q_LOW_BIT_SHIFT))
+ | DMA_QPTRLO_Q_ENABLE_BIT;
+
+ chan->chan_base->stad_q_next = 0;
+ chan->chan_base->stad_q_high =
+ upper_32_bits(chan->dst_sta_bd_pa);
+ chan->chan_base->stad_q_size = chan->total_descriptors;
+ chan->chan_base->stad_q_limit = chan->total_descriptors - 1;
+ if (chan->xdev->is_rootdma) {
+ chan->chan_base->stad_q_low = ROOTDMA_Q_READ_ATTRIBUTE
+ | DMA_QPTRLO_QLOCAXI_BIT;
+ } else {
+ chan->chan_base->stad_q_low = 0;
+ }
+ chan->chan_base->stad_q_low |=
+ (lower_32_bits(chan->dst_sta_bd_pa)
+ & ~(DMA_SRC_Q_LOW_BIT_SHIFT))
+ | DMA_QPTRLO_Q_ENABLE_BIT;
+ }
+
+ return 0;
+}
+
+static void update_channel_read_attribute(struct ps_pcie_dma_chan *chan)
+{
+ if (chan->xdev->is_rootdma) {
+ /* For Root DMA, Host Memory and Buffer Descriptors
+ * will be on AXI side, as it will be on the other
+ * side of bridge.
+ */
+ if (chan->srcq_buffer_location == BUFFER_LOC_PCI) {
+ chan->read_attribute = (AXI_ATTRIBUTE <<
+ SRC_CTL_ATTRIB_BIT_SHIFT) |
+ SOURCE_CONTROL_BD_LOC_AXI;
+ } else if (chan->srcq_buffer_location == BUFFER_LOC_AXI) {
+ chan->read_attribute = AXI_ATTRIBUTE <<
+ SRC_CTL_ATTRIB_BIT_SHIFT;
+ }
+ } else {
+ if (chan->srcq_buffer_location == BUFFER_LOC_PCI) {
+ chan->read_attribute = PCI_ATTRIBUTE <<
+ SRC_CTL_ATTRIB_BIT_SHIFT;
+ } else if (chan->srcq_buffer_location == BUFFER_LOC_AXI) {
+ chan->read_attribute = (AXI_ATTRIBUTE <<
+ SRC_CTL_ATTRIB_BIT_SHIFT) |
+ SOURCE_CONTROL_BD_LOC_AXI;
+ }
+ }
+}
+
+static void update_channel_write_attribute(struct ps_pcie_dma_chan *chan)
+{
+ if (chan->xdev->is_rootdma) {
+ /* For Root DMA, Host Memory and Buffer Descriptors
+ * will be on AXI side, as it will be on the other
+ * side of bridge.
+ */
+ if (chan->dstq_buffer_location == BUFFER_LOC_PCI) {
+ chan->write_attribute = (AXI_ATTRIBUTE <<
+ SRC_CTL_ATTRIB_BIT_SHIFT) |
+ SOURCE_CONTROL_BD_LOC_AXI;
+ } else if (chan->srcq_buffer_location == BUFFER_LOC_AXI) {
+ chan->write_attribute = AXI_ATTRIBUTE <<
+ SRC_CTL_ATTRIB_BIT_SHIFT;
+ }
+ } else {
+ if (chan->dstq_buffer_location == BUFFER_LOC_PCI) {
+ chan->write_attribute = PCI_ATTRIBUTE <<
+ SRC_CTL_ATTRIB_BIT_SHIFT;
+ } else if (chan->dstq_buffer_location == BUFFER_LOC_AXI) {
+ chan->write_attribute = (AXI_ATTRIBUTE <<
+ SRC_CTL_ATTRIB_BIT_SHIFT) |
+ SOURCE_CONTROL_BD_LOC_AXI;
+ }
+ }
+ chan->write_attribute |= SOURCE_CONTROL_BACK_TO_BACK_PACK_BIT;
+}
+
+static int init_sw_components(struct ps_pcie_dma_chan *chan)
+{
+ if ((chan->ppkt_ctx_srcq) && (chan->psrc_sgl_bd) &&
+ (chan->psrc_sta_bd)) {
+ memset(chan->ppkt_ctx_srcq, 0,
+ sizeof(struct PACKET_TRANSFER_PARAMS)
+ * chan->total_descriptors);
+
+ memset(chan->psrc_sgl_bd, 0,
+ sizeof(struct SOURCE_DMA_DESCRIPTOR)
+ * chan->total_descriptors);
+
+ memset(chan->psrc_sta_bd, 0,
+ sizeof(struct STATUS_DMA_DESCRIPTOR)
+ * chan->total_descriptors);
+
+ chan->src_avail_descriptors = chan->total_descriptors;
+
+ chan->src_sgl_freeidx = 0;
+ chan->src_staprobe_idx = 0;
+ chan->src_sta_hw_probe_idx = chan->total_descriptors - 1;
+ chan->idx_ctx_srcq_head = 0;
+ chan->idx_ctx_srcq_tail = 0;
+ }
+
+ if ((chan->ppkt_ctx_dstq) && (chan->pdst_sgl_bd) &&
+ (chan->pdst_sta_bd)) {
+ memset(chan->ppkt_ctx_dstq, 0,
+ sizeof(struct PACKET_TRANSFER_PARAMS)
+ * chan->total_descriptors);
+
+ memset(chan->pdst_sgl_bd, 0,
+ sizeof(struct DEST_DMA_DESCRIPTOR)
+ * chan->total_descriptors);
+
+ memset(chan->pdst_sta_bd, 0,
+ sizeof(struct STATUS_DMA_DESCRIPTOR)
+ * chan->total_descriptors);
+
+ chan->dst_avail_descriptors = chan->total_descriptors;
+
+ chan->dst_sgl_freeidx = 0;
+ chan->dst_staprobe_idx = 0;
+ chan->dst_sta_hw_probe_idx = chan->total_descriptors - 1;
+ chan->idx_ctx_dstq_head = 0;
+ chan->idx_ctx_dstq_tail = 0;
+ }
+
+ return 0;
+}
+
+/**
+ * ps_pcie_chan_reset - Resets channel, by programming relevant registers
+ *
+ * @chan: PS PCIe DMA channel information holder
+ * Return: void
+ */
+static void ps_pcie_chan_reset(struct ps_pcie_dma_chan *chan)
+{
+ /* Enable channel reset */
+ ps_pcie_dma_set_mask(chan, DMA_CNTRL_REG_OFFSET, DMA_CNTRL_RST_BIT);
+
+ mdelay(10);
+
+ /* Disable channel reset */
+ ps_pcie_dma_clr_mask(chan, DMA_CNTRL_REG_OFFSET, DMA_CNTRL_RST_BIT);
+}
+
+/**
+ * poll_completed_transactions - Function invoked by poll timer
+ *
+ * @arg: Pointer to PS PCIe DMA channel information
+ * Return: void
+ */
+static void poll_completed_transactions(unsigned long arg)
+{
+ struct ps_pcie_dma_chan *chan = (struct ps_pcie_dma_chan *)arg;
+
+ if (chan->state == CHANNEL_AVAILABLE) {
+ queue_work(chan->primary_desc_cleanup,
+ &chan->handle_primary_desc_cleanup);
+ }
+
+ mod_timer(&chan->poll_timer, jiffies + chan->poll_timer_freq);
+}
+
+static bool check_descriptors_for_two_queues(struct ps_pcie_dma_chan *chan,
+ struct ps_pcie_tx_segment *seg)
+{
+ if (seg->tx_elements.src_sgl) {
+ if (chan->src_avail_descriptors >=
+ seg->tx_elements.srcq_num_elemets) {
+ return true;
+ }
+ } else if (seg->tx_elements.dst_sgl) {
+ if (chan->dst_avail_descriptors >=
+ seg->tx_elements.dstq_num_elemets) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool check_descriptors_for_all_queues(struct ps_pcie_dma_chan *chan,
+ struct ps_pcie_tx_segment *seg)
+{
+ if ((chan->src_avail_descriptors >=
+ seg->tx_elements.srcq_num_elemets) &&
+ (chan->dst_avail_descriptors >=
+ seg->tx_elements.dstq_num_elemets)) {
+ return true;
+ }
+
+ return false;
+}
+
+static bool check_descriptor_availability(struct ps_pcie_dma_chan *chan,
+ struct ps_pcie_tx_segment *seg)
+{
+ if (chan->num_queues == DEFAULT_DMA_QUEUES)
+ return check_descriptors_for_all_queues(chan, seg);
+ else
+ return check_descriptors_for_two_queues(chan, seg);
+}
+
+static void handle_error(struct ps_pcie_dma_chan *chan)
+{
+ if (chan->state != CHANNEL_AVAILABLE)
+ return;
+
+ spin_lock(&chan->channel_lock);
+ chan->state = CHANNEL_ERROR;
+ spin_unlock(&chan->channel_lock);
+
+ if (chan->maintenance_workq)
+ queue_work(chan->maintenance_workq, &chan->handle_chan_reset);
+}
+
+static void xlnx_ps_pcie_update_srcq(struct ps_pcie_dma_chan *chan,
+ struct ps_pcie_tx_segment *seg)
+{
+ struct SOURCE_DMA_DESCRIPTOR *pdesc;
+ struct PACKET_TRANSFER_PARAMS *pkt_ctx = NULL;
+ struct scatterlist *sgl_ptr;
+ unsigned int i;
+
+ pkt_ctx = chan->ppkt_ctx_srcq + chan->idx_ctx_srcq_head;
+ if (pkt_ctx->availability_status == IN_USE) {
+ dev_err(chan->dev,
+ "src pkt context not avail for channel %d\n",
+ chan->channel_number);
+ handle_error(chan);
+ return;
+ }
+
+ pkt_ctx->availability_status = IN_USE;
+ pkt_ctx->sgl = seg->tx_elements.src_sgl;
+
+ if (chan->srcq_buffer_location == BUFFER_LOC_PCI)
+ pkt_ctx->seg = seg;
+
+ /* Get the address of the next available DMA Descriptor */
+ pdesc = chan->psrc_sgl_bd + chan->src_sgl_freeidx;
+ pkt_ctx->idx_sop = chan->src_sgl_freeidx;
+
+ /* Build transactions using information in the scatter gather list */
+ for_each_sg(seg->tx_elements.src_sgl, sgl_ptr,
+ seg->tx_elements.srcq_num_elemets, i) {
+ if (chan->xdev->dma_buf_ext_addr) {
+ pdesc->system_address =
+ (u64)sg_dma_address(sgl_ptr);
+ } else {
+ pdesc->system_address =
+ (u32)sg_dma_address(sgl_ptr);
+ }
+
+ pdesc->control_byte_count = (sg_dma_len(sgl_ptr) &
+ SOURCE_CONTROL_BD_BYTE_COUNT_MASK) |
+ chan->read_attribute;
+ if (pkt_ctx->seg)
+ pkt_ctx->requested_bytes += sg_dma_len(sgl_ptr);
+
+ pdesc->user_handle = chan->idx_ctx_srcq_head;
+ pdesc->user_id = DEFAULT_UID;
+ /* Check if this is last descriptor */
+ if (i == (seg->tx_elements.srcq_num_elemets - 1)) {
+ pkt_ctx->idx_eop = chan->src_sgl_freeidx;
+ pdesc->control_byte_count = pdesc->control_byte_count |
+ SOURCE_CONTROL_BD_EOP_BIT |
+ SOURCE_CONTROL_BD_INTR_BIT;
+ }
+ chan->src_sgl_freeidx++;
+ if (chan->src_sgl_freeidx == chan->total_descriptors)
+ chan->src_sgl_freeidx = 0;
+ pdesc = chan->psrc_sgl_bd + chan->src_sgl_freeidx;
+ spin_lock(&chan->src_desc_lock);
+ chan->src_avail_descriptors--;
+ spin_unlock(&chan->src_desc_lock);
+ }
+
+ chan->chan_base->src_q_limit = chan->src_sgl_freeidx;
+ chan->idx_ctx_srcq_head++;
+ if (chan->idx_ctx_srcq_head == chan->total_descriptors)
+ chan->idx_ctx_srcq_head = 0;
+}
+
+static void xlnx_ps_pcie_update_dstq(struct ps_pcie_dma_chan *chan,
+ struct ps_pcie_tx_segment *seg)
+{
+ struct DEST_DMA_DESCRIPTOR *pdesc;
+ struct PACKET_TRANSFER_PARAMS *pkt_ctx = NULL;
+ struct scatterlist *sgl_ptr;
+ unsigned int i;
+
+ pkt_ctx = chan->ppkt_ctx_dstq + chan->idx_ctx_dstq_head;
+ if (pkt_ctx->availability_status == IN_USE) {
+ dev_err(chan->dev,
+ "dst pkt context not avail for channel %d\n",
+ chan->channel_number);
+ handle_error(chan);
+
+ return;
+ }
+
+ pkt_ctx->availability_status = IN_USE;
+ pkt_ctx->sgl = seg->tx_elements.dst_sgl;
+
+ if (chan->dstq_buffer_location == BUFFER_LOC_PCI)
+ pkt_ctx->seg = seg;
+
+ pdesc = chan->pdst_sgl_bd + chan->dst_sgl_freeidx;
+ pkt_ctx->idx_sop = chan->dst_sgl_freeidx;
+
+ /* Build transactions using information in the scatter gather list */
+ for_each_sg(seg->tx_elements.dst_sgl, sgl_ptr,
+ seg->tx_elements.dstq_num_elemets, i) {
+ if (chan->xdev->dma_buf_ext_addr) {
+ pdesc->system_address =
+ (u64)sg_dma_address(sgl_ptr);
+ } else {
+ pdesc->system_address =
+ (u32)sg_dma_address(sgl_ptr);
+ }
+
+ pdesc->control_byte_count = (sg_dma_len(sgl_ptr) &
+ SOURCE_CONTROL_BD_BYTE_COUNT_MASK) |
+ chan->write_attribute;
+
+ if (pkt_ctx->seg)
+ pkt_ctx->requested_bytes += sg_dma_len(sgl_ptr);
+
+ pdesc->user_handle = chan->idx_ctx_dstq_head;
+ /* Check if this is last descriptor */
+ if (i == (seg->tx_elements.dstq_num_elemets - 1))
+ pkt_ctx->idx_eop = chan->dst_sgl_freeidx;
+ chan->dst_sgl_freeidx++;
+ if (chan->dst_sgl_freeidx == chan->total_descriptors)
+ chan->dst_sgl_freeidx = 0;
+ pdesc = chan->pdst_sgl_bd + chan->dst_sgl_freeidx;
+ spin_lock(&chan->dst_desc_lock);
+ chan->dst_avail_descriptors--;
+ spin_unlock(&chan->dst_desc_lock);
+ }
+
+ chan->chan_base->dst_q_limit = chan->dst_sgl_freeidx;
+ chan->idx_ctx_dstq_head++;
+ if (chan->idx_ctx_dstq_head == chan->total_descriptors)
+ chan->idx_ctx_dstq_head = 0;
+}
+
+static void ps_pcie_chan_program_work(struct work_struct *work)
+{
+ struct ps_pcie_dma_chan *chan =
+ (struct ps_pcie_dma_chan *)container_of(work,
+ struct ps_pcie_dma_chan,
+ handle_chan_programming);
+ struct ps_pcie_tx_segment *seg = NULL;
+
+ while (chan->state == CHANNEL_AVAILABLE) {
+ spin_lock(&chan->active_list_lock);
+ seg = list_first_entry_or_null(&chan->active_list,
+ struct ps_pcie_tx_segment, node);
+ spin_unlock(&chan->active_list_lock);
+
+ if (!seg)
+ break;
+
+ if (check_descriptor_availability(chan, seg) == false)
+ break;
+
+ spin_lock(&chan->active_list_lock);
+ list_del(&seg->node);
+ spin_unlock(&chan->active_list_lock);
+
+ if (seg->tx_elements.src_sgl)
+ xlnx_ps_pcie_update_srcq(chan, seg);
+
+ if (seg->tx_elements.dst_sgl)
+ xlnx_ps_pcie_update_dstq(chan, seg);
+ }
+}
+
+/**
+ * dst_cleanup_work - Goes through all completed elements in status Q
+ * and invokes callbacks for the concerned DMA transaction.
+ *
+ * @work: Work associated with the task
+ *
+ * Return: void
+ */
+static void dst_cleanup_work(struct work_struct *work)
+{
+ struct ps_pcie_dma_chan *chan =
+ (struct ps_pcie_dma_chan *)container_of(work,
+ struct ps_pcie_dma_chan, handle_dstq_desc_cleanup);
+
+ struct STATUS_DMA_DESCRIPTOR *psta_bd;
+ struct DEST_DMA_DESCRIPTOR *pdst_bd;
+ struct PACKET_TRANSFER_PARAMS *ppkt_ctx;
+ struct dmaengine_result rslt;
+ u32 completed_bytes;
+ u32 dstq_desc_idx;
+
+ psta_bd = chan->pdst_sta_bd + chan->dst_staprobe_idx;
+
+ while (psta_bd->status_flag_byte_count & STA_BD_COMPLETED_BIT) {
+ if (psta_bd->status_flag_byte_count &
+ STA_BD_DESTINATION_ERROR_BIT) {
+ dev_err(chan->dev,
+ "Dst Sts Elmnt %d chan %d has Destination Err",
+ chan->dst_staprobe_idx + 1,
+ chan->channel_number);
+ handle_error(chan);
+ break;
+ }
+ if (psta_bd->status_flag_byte_count & STA_BD_SOURCE_ERROR_BIT) {
+ dev_err(chan->dev,
+ "Dst Sts Elmnt %d chan %d has Source Error",
+ chan->dst_staprobe_idx + 1,
+ chan->channel_number);
+ handle_error(chan);
+ break;
+ }
+ if (psta_bd->status_flag_byte_count &
+ STA_BD_INTERNAL_ERROR_BIT) {
+ dev_err(chan->dev,
+ "Dst Sts Elmnt %d chan %d has Internal Error",
+ chan->dst_staprobe_idx + 1,
+ chan->channel_number);
+ handle_error(chan);
+ break;
+ }
+ /* we are using 64 bit USER field. */
+ if ((psta_bd->status_flag_byte_count &
+ STA_BD_UPPER_STATUS_NONZERO_BIT) == 0) {
+ dev_err(chan->dev,
+ "Dst Sts Elmnt %d for chan %d has NON ZERO",
+ chan->dst_staprobe_idx + 1,
+ chan->channel_number);
+ handle_error(chan);
+ break;
+ }
+
+ chan->idx_ctx_dstq_tail = psta_bd->user_handle;
+ ppkt_ctx = chan->ppkt_ctx_dstq + chan->idx_ctx_dstq_tail;
+ completed_bytes = (psta_bd->status_flag_byte_count &
+ STA_BD_BYTE_COUNT_MASK) >>
+ STA_BD_BYTE_COUNT_SHIFT;
+
+ memset(psta_bd, 0, sizeof(struct STATUS_DMA_DESCRIPTOR));
+
+ chan->dst_staprobe_idx++;
+
+ if (chan->dst_staprobe_idx == chan->total_descriptors)
+ chan->dst_staprobe_idx = 0;
+
+ chan->dst_sta_hw_probe_idx++;
+
+ if (chan->dst_sta_hw_probe_idx == chan->total_descriptors)
+ chan->dst_sta_hw_probe_idx = 0;
+
+ chan->chan_base->stad_q_limit = chan->dst_sta_hw_probe_idx;
+
+ psta_bd = chan->pdst_sta_bd + chan->dst_staprobe_idx;
+
+ dstq_desc_idx = ppkt_ctx->idx_sop;
+
+ do {
+ pdst_bd = chan->pdst_sgl_bd + dstq_desc_idx;
+ memset(pdst_bd, 0,
+ sizeof(struct DEST_DMA_DESCRIPTOR));
+
+ spin_lock(&chan->dst_desc_lock);
+ chan->dst_avail_descriptors++;
+ spin_unlock(&chan->dst_desc_lock);
+
+ if (dstq_desc_idx == ppkt_ctx->idx_eop)
+ break;
+
+ dstq_desc_idx++;
+
+ if (dstq_desc_idx == chan->total_descriptors)
+ dstq_desc_idx = 0;
+
+ } while (1);
+
+ /* Invoking callback */
+ if (ppkt_ctx->seg) {
+ spin_lock(&chan->cookie_lock);
+ dma_cookie_complete(&ppkt_ctx->seg->async_tx);
+ spin_unlock(&chan->cookie_lock);
+ rslt.result = DMA_TRANS_NOERROR;
+ rslt.residue = ppkt_ctx->requested_bytes -
+ completed_bytes;
+ dmaengine_desc_get_callback_invoke(&ppkt_ctx->seg->async_tx,
+ &rslt);
+ mempool_free(ppkt_ctx->seg, chan->transactions_pool);
+ }
+ memset(ppkt_ctx, 0, sizeof(struct PACKET_TRANSFER_PARAMS));
+ }
+
+ complete(&chan->dstq_work_complete);
+}
+
+/**
+ * src_cleanup_work - Goes through all completed elements in status Q and
+ * invokes callbacks for the concerned DMA transaction.
+ *
+ * @work: Work associated with the task
+ *
+ * Return: void
+ */
+static void src_cleanup_work(struct work_struct *work)
+{
+ struct ps_pcie_dma_chan *chan =
+ (struct ps_pcie_dma_chan *)container_of(
+ work, struct ps_pcie_dma_chan, handle_srcq_desc_cleanup);
+
+ struct STATUS_DMA_DESCRIPTOR *psta_bd;
+ struct SOURCE_DMA_DESCRIPTOR *psrc_bd;
+ struct PACKET_TRANSFER_PARAMS *ppkt_ctx;
+ struct dmaengine_result rslt;
+ u32 completed_bytes;
+ u32 srcq_desc_idx;
+
+ psta_bd = chan->psrc_sta_bd + chan->src_staprobe_idx;
+
+ while (psta_bd->status_flag_byte_count & STA_BD_COMPLETED_BIT) {
+ if (psta_bd->status_flag_byte_count &
+ STA_BD_DESTINATION_ERROR_BIT) {
+ dev_err(chan->dev,
+ "Src Sts Elmnt %d chan %d has Dst Error",
+ chan->src_staprobe_idx + 1,
+ chan->channel_number);
+ handle_error(chan);
+ break;
+ }
+ if (psta_bd->status_flag_byte_count & STA_BD_SOURCE_ERROR_BIT) {
+ dev_err(chan->dev,
+ "Src Sts Elmnt %d chan %d has Source Error",
+ chan->src_staprobe_idx + 1,
+ chan->channel_number);
+ handle_error(chan);
+ break;
+ }
+ if (psta_bd->status_flag_byte_count &
+ STA_BD_INTERNAL_ERROR_BIT) {
+ dev_err(chan->dev,
+ "Src Sts Elmnt %d chan %d has Internal Error",
+ chan->src_staprobe_idx + 1,
+ chan->channel_number);
+ handle_error(chan);
+ break;
+ }
+ if ((psta_bd->status_flag_byte_count
+ & STA_BD_UPPER_STATUS_NONZERO_BIT) == 0) {
+ dev_err(chan->dev,
+ "Src Sts Elmnt %d chan %d has NonZero",
+ chan->src_staprobe_idx + 1,
+ chan->channel_number);
+ handle_error(chan);
+ break;
+ }
+ chan->idx_ctx_srcq_tail = psta_bd->user_handle;
+ ppkt_ctx = chan->ppkt_ctx_srcq + chan->idx_ctx_srcq_tail;
+ completed_bytes = (psta_bd->status_flag_byte_count
+ & STA_BD_BYTE_COUNT_MASK) >>
+ STA_BD_BYTE_COUNT_SHIFT;
+
+ memset(psta_bd, 0, sizeof(struct STATUS_DMA_DESCRIPTOR));
+
+ chan->src_staprobe_idx++;
+
+ if (chan->src_staprobe_idx == chan->total_descriptors)
+ chan->src_staprobe_idx = 0;
+
+ chan->src_sta_hw_probe_idx++;
+
+ if (chan->src_sta_hw_probe_idx == chan->total_descriptors)
+ chan->src_sta_hw_probe_idx = 0;
+
+ chan->chan_base->stas_q_limit = chan->src_sta_hw_probe_idx;
+
+ psta_bd = chan->psrc_sta_bd + chan->src_staprobe_idx;
+
+ srcq_desc_idx = ppkt_ctx->idx_sop;
+
+ do {
+ psrc_bd = chan->psrc_sgl_bd + srcq_desc_idx;
+ memset(psrc_bd, 0,
+ sizeof(struct SOURCE_DMA_DESCRIPTOR));
+
+ spin_lock(&chan->src_desc_lock);
+ chan->src_avail_descriptors++;
+ spin_unlock(&chan->src_desc_lock);
+
+ if (srcq_desc_idx == ppkt_ctx->idx_eop)
+ break;
+ srcq_desc_idx++;
+
+ if (srcq_desc_idx == chan->total_descriptors)
+ srcq_desc_idx = 0;
+
+ } while (1);
+
+ /* Invoking callback */
+ if (ppkt_ctx->seg) {
+ spin_lock(&chan->cookie_lock);
+ dma_cookie_complete(&ppkt_ctx->seg->async_tx);
+ spin_unlock(&chan->cookie_lock);
+ rslt.result = DMA_TRANS_NOERROR;
+ rslt.residue = ppkt_ctx->requested_bytes -
+ completed_bytes;
+ dmaengine_desc_get_callback_invoke(&ppkt_ctx->seg->async_tx,
+ &rslt);
+ mempool_free(ppkt_ctx->seg, chan->transactions_pool);
+ }
+ memset(ppkt_ctx, 0, sizeof(struct PACKET_TRANSFER_PARAMS));
+ }
+
+ complete(&chan->srcq_work_complete);
+}
+
+/**
+ * ps_pcie_chan_primary_work - Masks out interrupts, invokes source Q and
+ * destination Q processing. Waits for source Q and destination Q processing
+ * and re enables interrupts. Same work is invoked by timer if coalesce count
+ * is greater than zero and interrupts are not invoked before the timeout period
+ *
+ * @work: Work associated with the task
+ *
+ * Return: void
+ */
+static void ps_pcie_chan_primary_work(struct work_struct *work)
+{
+ struct ps_pcie_dma_chan *chan =
+ (struct ps_pcie_dma_chan *)container_of(
+ work, struct ps_pcie_dma_chan,
+ handle_primary_desc_cleanup);
+
+ /* Disable interrupts for Channel */
+ ps_pcie_dma_clr_mask(chan, chan->intr_control_offset,
+ DMA_INTCNTRL_ENABLINTR_BIT);
+
+ if (chan->psrc_sgl_bd) {
+ reinit_completion(&chan->srcq_work_complete);
+ if (chan->srcq_desc_cleanup)
+ queue_work(chan->srcq_desc_cleanup,
+ &chan->handle_srcq_desc_cleanup);
+ }
+ if (chan->pdst_sgl_bd) {
+ reinit_completion(&chan->dstq_work_complete);
+ if (chan->dstq_desc_cleanup)
+ queue_work(chan->dstq_desc_cleanup,
+ &chan->handle_dstq_desc_cleanup);
+ }
+
+ if (chan->psrc_sgl_bd)
+ wait_for_completion_interruptible(&chan->srcq_work_complete);
+ if (chan->pdst_sgl_bd)
+ wait_for_completion_interruptible(&chan->dstq_work_complete);
+
+ /* Enable interrupts for channel */
+ ps_pcie_dma_set_mask(chan, chan->intr_control_offset,
+ DMA_INTCNTRL_ENABLINTR_BIT);
+
+ if (chan->chan_programming) {
+ queue_work(chan->chan_programming,
+ &chan->handle_chan_programming);
+ }
+
+ if (chan->coalesce_count > 0 && chan->poll_timer.function)
+ mod_timer(&chan->poll_timer, jiffies + chan->poll_timer_freq);
+}
+
+static int probe_channel_properties(struct platform_device *platform_dev,
+ struct xlnx_pcie_dma_device *xdev,
+ u16 channel_number)
+{
+ int i;
+ char propertyname[CHANNEL_PROPERTY_LENGTH];
+ int numvals, ret;
+ u32 *val;
+ struct ps_pcie_dma_chan *channel;
+ struct ps_pcie_dma_channel_match *xlnx_match;
+
+ snprintf(propertyname, CHANNEL_PROPERTY_LENGTH,
+ "ps_pcie_channel%d", channel_number);
+
+ channel = &xdev->channels[channel_number];
+
+ spin_lock_init(&channel->channel_lock);
+ spin_lock_init(&channel->cookie_lock);
+
+ INIT_LIST_HEAD(&channel->pending_list);
+ spin_lock_init(&channel->pending_list_lock);
+
+ INIT_LIST_HEAD(&channel->active_list);
+ spin_lock_init(&channel->active_list_lock);
+
+ spin_lock_init(&channel->src_desc_lock);
+ spin_lock_init(&channel->dst_desc_lock);
+
+ INIT_LIST_HEAD(&channel->pending_interrupts_list);
+ spin_lock_init(&channel->pending_interrupts_lock);
+
+ INIT_LIST_HEAD(&channel->active_interrupts_list);
+ spin_lock_init(&channel->active_interrupts_lock);
+
+ init_completion(&channel->srcq_work_complete);
+ init_completion(&channel->dstq_work_complete);
+ init_completion(&channel->chan_shutdown_complt);
+ init_completion(&channel->chan_terminate_complete);
+
+ if (device_property_present(&platform_dev->dev, propertyname)) {
+ numvals = device_property_read_u32_array(&platform_dev->dev,
+ propertyname, NULL, 0);
+
+ if (numvals < 0)
+ return numvals;
+
+ val = devm_kzalloc(&platform_dev->dev, sizeof(u32) * numvals,
+ GFP_KERNEL);
+
+ if (!val)
+ return -ENOMEM;
+
+ ret = device_property_read_u32_array(&platform_dev->dev,
+ propertyname, val,
+ numvals);
+ if (ret < 0) {
+ dev_err(&platform_dev->dev,
+ "Unable to read property %s\n", propertyname);
+ return ret;
+ }
+
+ for (i = 0; i < numvals; i++) {
+ switch (i) {
+ case DMA_CHANNEL_DIRECTION:
+ channel->direction =
+ (val[DMA_CHANNEL_DIRECTION] ==
+ PCIE_AXI_DIRECTION) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE;
+ break;
+ case NUM_DESCRIPTORS:
+ channel->total_descriptors =
+ val[NUM_DESCRIPTORS];
+ if (channel->total_descriptors >
+ MAX_DESCRIPTORS) {
+ dev_info(&platform_dev->dev,
+ "Descriptors > alowd max\n");
+ channel->total_descriptors =
+ MAX_DESCRIPTORS;
+ }
+ break;
+ case NUM_QUEUES:
+ channel->num_queues = val[NUM_QUEUES];
+ switch (channel->num_queues) {
+ case DEFAULT_DMA_QUEUES:
+ break;
+ case TWO_DMA_QUEUES:
+ break;
+ default:
+ dev_info(&platform_dev->dev,
+ "Incorrect Q number for dma chan\n");
+ channel->num_queues = DEFAULT_DMA_QUEUES;
+ }
+ break;
+ case COALESE_COUNT:
+ channel->coalesce_count = val[COALESE_COUNT];
+
+ if (channel->coalesce_count >
+ MAX_COALESCE_COUNT) {
+ dev_info(&platform_dev->dev,
+ "Invalid coalesce Count\n");
+ channel->coalesce_count =
+ MAX_COALESCE_COUNT;
+ }
+ break;
+ case POLL_TIMER_FREQUENCY:
+ channel->poll_timer_freq =
+ val[POLL_TIMER_FREQUENCY];
+ break;
+ default:
+ dev_err(&platform_dev->dev,
+ "Check order of channel properties!\n");
+ }
+ }
+ } else {
+ dev_err(&platform_dev->dev,
+ "Property %s not present. Invalid configuration!\n",
+ propertyname);
+ return -ENOTSUPP;
+ }
+
+ if (channel->direction == DMA_TO_DEVICE) {
+ if (channel->num_queues == DEFAULT_DMA_QUEUES) {
+ channel->srcq_buffer_location = BUFFER_LOC_PCI;
+ channel->dstq_buffer_location = BUFFER_LOC_AXI;
+ } else {
+ channel->srcq_buffer_location = BUFFER_LOC_PCI;
+ channel->dstq_buffer_location = BUFFER_LOC_INVALID;
+ }
+ } else {
+ if (channel->num_queues == DEFAULT_DMA_QUEUES) {
+ channel->srcq_buffer_location = BUFFER_LOC_AXI;
+ channel->dstq_buffer_location = BUFFER_LOC_PCI;
+ } else {
+ channel->srcq_buffer_location = BUFFER_LOC_INVALID;
+ channel->dstq_buffer_location = BUFFER_LOC_PCI;
+ }
+ }
+
+ channel->xdev = xdev;
+ channel->channel_number = channel_number;
+
+ if (xdev->is_rootdma) {
+ channel->dev = xdev->dev;
+ channel->intr_status_offset = DMA_AXI_INTR_STATUS_REG_OFFSET;
+ channel->intr_control_offset = DMA_AXI_INTR_CNTRL_REG_OFFSET;
+ } else {
+ channel->dev = &xdev->pci_dev->dev;
+ channel->intr_status_offset = DMA_PCIE_INTR_STATUS_REG_OFFSET;
+ channel->intr_control_offset = DMA_PCIE_INTR_CNTRL_REG_OFFSET;
+ }
+
+ channel->chan_base =
+ (struct DMA_ENGINE_REGISTERS *)((__force char *)(xdev->reg_base) +
+ (channel_number * DMA_CHANNEL_REGS_SIZE));
+
+ if (((channel->chan_base->dma_channel_status) &
+ DMA_STATUS_DMA_PRES_BIT) == 0) {
+ dev_err(&platform_dev->dev,
+ "Hardware reports channel not present\n");
+ return -ENOTSUPP;
+ }
+
+ update_channel_read_attribute(channel);
+ update_channel_write_attribute(channel);
+
+ xlnx_match = devm_kzalloc(&platform_dev->dev,
+ sizeof(struct ps_pcie_dma_channel_match),
+ GFP_KERNEL);
+
+ if (!xlnx_match)
+ return -ENOMEM;
+
+ if (xdev->is_rootdma) {
+ xlnx_match->pci_vendorid = xdev->rootdma_vendor;
+ xlnx_match->pci_deviceid = xdev->rootdma_device;
+ } else {
+ xlnx_match->pci_vendorid = xdev->pci_dev->vendor;
+ xlnx_match->pci_deviceid = xdev->pci_dev->device;
+ xlnx_match->bar_params = xdev->bar_info;
+ }
+
+ xlnx_match->board_number = xdev->board_number;
+ xlnx_match->channel_number = channel_number;
+ xlnx_match->direction = xdev->channels[channel_number].direction;
+
+ channel->common.private = (void *)xlnx_match;
+
+ channel->common.device = &xdev->common;
+ list_add_tail(&channel->common.device_node, &xdev->common.channels);
+
+ return 0;
+}
+
+static void xlnx_ps_pcie_destroy_mempool(struct ps_pcie_dma_chan *chan)
+{
+ mempool_destroy(chan->transactions_pool);
+
+ mempool_destroy(chan->intr_transactions_pool);
+}
+
+static void xlnx_ps_pcie_free_worker_queues(struct ps_pcie_dma_chan *chan)
+{
+ if (chan->maintenance_workq)
+ destroy_workqueue(chan->maintenance_workq);
+
+ if (chan->sw_intrs_wrkq)
+ destroy_workqueue(chan->sw_intrs_wrkq);
+
+ if (chan->srcq_desc_cleanup)
+ destroy_workqueue(chan->srcq_desc_cleanup);
+
+ if (chan->dstq_desc_cleanup)
+ destroy_workqueue(chan->dstq_desc_cleanup);
+
+ if (chan->chan_programming)
+ destroy_workqueue(chan->chan_programming);
+
+ if (chan->primary_desc_cleanup)
+ destroy_workqueue(chan->primary_desc_cleanup);
+}
+
+static void xlnx_ps_pcie_free_pkt_ctxts(struct ps_pcie_dma_chan *chan)
+{
+ kfree(chan->ppkt_ctx_srcq);
+
+ kfree(chan->ppkt_ctx_dstq);
+}
+
+static void xlnx_ps_pcie_free_descriptors(struct ps_pcie_dma_chan *chan)
+{
+ ssize_t size;
+
+ if (chan->psrc_sgl_bd) {
+ size = chan->total_descriptors *
+ sizeof(struct SOURCE_DMA_DESCRIPTOR);
+ dma_free_coherent(chan->dev, size, chan->psrc_sgl_bd,
+ chan->src_sgl_bd_pa);
+ }
+
+ if (chan->pdst_sgl_bd) {
+ size = chan->total_descriptors *
+ sizeof(struct DEST_DMA_DESCRIPTOR);
+ dma_free_coherent(chan->dev, size, chan->pdst_sgl_bd,
+ chan->dst_sgl_bd_pa);
+ }
+
+ if (chan->psrc_sta_bd) {
+ size = chan->total_descriptors *
+ sizeof(struct STATUS_DMA_DESCRIPTOR);
+ dma_free_coherent(chan->dev, size, chan->psrc_sta_bd,
+ chan->src_sta_bd_pa);
+ }
+
+ if (chan->pdst_sta_bd) {
+ size = chan->total_descriptors *
+ sizeof(struct STATUS_DMA_DESCRIPTOR);
+ dma_free_coherent(chan->dev, size, chan->pdst_sta_bd,
+ chan->dst_sta_bd_pa);
+ }
+}
+
+static int xlnx_ps_pcie_channel_activate(struct ps_pcie_dma_chan *chan)
+{
+ u32 reg = chan->coalesce_count;
+
+ reg = reg << DMA_INTCNTRL_SGCOLSCCNT_BIT_SHIFT;
+
+ /* Enable Interrupts for channel */
+ ps_pcie_dma_set_mask(chan, chan->intr_control_offset,
+ reg | DMA_INTCNTRL_ENABLINTR_BIT |
+ DMA_INTCNTRL_DMAERRINTR_BIT |
+ DMA_INTCNTRL_DMASGINTR_BIT);
+
+ /* Enable DMA */
+ ps_pcie_dma_set_mask(chan, DMA_CNTRL_REG_OFFSET,
+ DMA_CNTRL_ENABL_BIT |
+ DMA_CNTRL_64BIT_STAQ_ELEMSZ_BIT);
+
+ spin_lock(&chan->channel_lock);
+ chan->state = CHANNEL_AVAILABLE;
+ spin_unlock(&chan->channel_lock);
+
+ /* Activate timer if required */
+ if ((chan->coalesce_count > 0) && !chan->poll_timer.function)
+ xlnx_ps_pcie_alloc_poll_timer(chan);
+
+ return 0;
+}
+
+static void xlnx_ps_pcie_channel_quiesce(struct ps_pcie_dma_chan *chan)
+{
+ /* Disable interrupts for Channel */
+ ps_pcie_dma_clr_mask(chan, chan->intr_control_offset,
+ DMA_INTCNTRL_ENABLINTR_BIT);
+
+ /* Delete timer if it is created */
+ if ((chan->coalesce_count > 0) && (!chan->poll_timer.function))
+ xlnx_ps_pcie_free_poll_timer(chan);
+
+ /* Flush descriptor cleaning work queues */
+ if (chan->primary_desc_cleanup)
+ flush_workqueue(chan->primary_desc_cleanup);
+
+ /* Flush channel programming work queue */
+ if (chan->chan_programming)
+ flush_workqueue(chan->chan_programming);
+
+ /* Clear the persistent bits */
+ ps_pcie_dma_set_mask(chan, chan->intr_status_offset,
+ DMA_INTSTATUS_DMAERR_BIT |
+ DMA_INTSTATUS_SGLINTR_BIT |
+ DMA_INTSTATUS_SWINTR_BIT);
+
+ /* Disable DMA channel */
+ ps_pcie_dma_clr_mask(chan, DMA_CNTRL_REG_OFFSET, DMA_CNTRL_ENABL_BIT);
+
+ spin_lock(&chan->channel_lock);
+ chan->state = CHANNEL_UNAVIALBLE;
+ spin_unlock(&chan->channel_lock);
+}
+
+static u32 total_bytes_in_sgl(struct scatterlist *sgl,
+ unsigned int num_entries)
+{
+ u32 total_bytes = 0;
+ struct scatterlist *sgl_ptr;
+ unsigned int i;
+
+ for_each_sg(sgl, sgl_ptr, num_entries, i)
+ total_bytes += sg_dma_len(sgl_ptr);
+
+ return total_bytes;
+}
+
+static void ivk_cbk_intr_seg(struct ps_pcie_intr_segment *intr_seg,
+ struct ps_pcie_dma_chan *chan,
+ enum dmaengine_tx_result result)
+{
+ struct dmaengine_result rslt;
+
+ rslt.result = result;
+ rslt.residue = 0;
+
+ spin_lock(&chan->cookie_lock);
+ dma_cookie_complete(&intr_seg->async_intr_tx);
+ spin_unlock(&chan->cookie_lock);
+
+ dmaengine_desc_get_callback_invoke(&intr_seg->async_intr_tx, &rslt);
+}
+
+static void ivk_cbk_seg(struct ps_pcie_tx_segment *seg,
+ struct ps_pcie_dma_chan *chan,
+ enum dmaengine_tx_result result)
+{
+ struct dmaengine_result rslt, *prslt;
+
+ spin_lock(&chan->cookie_lock);
+ dma_cookie_complete(&seg->async_tx);
+ spin_unlock(&chan->cookie_lock);
+
+ rslt.result = result;
+ if (seg->tx_elements.src_sgl &&
+ chan->srcq_buffer_location == BUFFER_LOC_PCI) {
+ rslt.residue =
+ total_bytes_in_sgl(seg->tx_elements.src_sgl,
+ seg->tx_elements.srcq_num_elemets);
+ prslt = &rslt;
+ } else if (seg->tx_elements.dst_sgl &&
+ chan->dstq_buffer_location == BUFFER_LOC_PCI) {
+ rslt.residue =
+ total_bytes_in_sgl(seg->tx_elements.dst_sgl,
+ seg->tx_elements.dstq_num_elemets);
+ prslt = &rslt;
+ } else {
+ prslt = NULL;
+ }
+
+ dmaengine_desc_get_callback_invoke(&seg->async_tx, prslt);
+}
+
+static void ivk_cbk_ctx(struct PACKET_TRANSFER_PARAMS *ppkt_ctxt,
+ struct ps_pcie_dma_chan *chan,
+ enum dmaengine_tx_result result)
+{
+ if (ppkt_ctxt->availability_status == IN_USE) {
+ if (ppkt_ctxt->seg) {
+ ivk_cbk_seg(ppkt_ctxt->seg, chan, result);
+ mempool_free(ppkt_ctxt->seg,
+ chan->transactions_pool);
+ }
+ }
+}
+
+static void ivk_cbk_for_pending(struct ps_pcie_dma_chan *chan)
+{
+ int i;
+ struct PACKET_TRANSFER_PARAMS *ppkt_ctxt;
+ struct ps_pcie_tx_segment *seg, *seg_nxt;
+ struct ps_pcie_intr_segment *intr_seg, *intr_seg_next;
+
+ if (chan->ppkt_ctx_srcq) {
+ if (chan->idx_ctx_srcq_tail != chan->idx_ctx_srcq_head) {
+ i = chan->idx_ctx_srcq_tail;
+ while (i != chan->idx_ctx_srcq_head) {
+ ppkt_ctxt = chan->ppkt_ctx_srcq + i;
+ ivk_cbk_ctx(ppkt_ctxt, chan,
+ DMA_TRANS_READ_FAILED);
+ memset(ppkt_ctxt, 0,
+ sizeof(struct PACKET_TRANSFER_PARAMS));
+ i++;
+ if (i == chan->total_descriptors)
+ i = 0;
+ }
+ }
+ }
+
+ if (chan->ppkt_ctx_dstq) {
+ if (chan->idx_ctx_dstq_tail != chan->idx_ctx_dstq_head) {
+ i = chan->idx_ctx_dstq_tail;
+ while (i != chan->idx_ctx_dstq_head) {
+ ppkt_ctxt = chan->ppkt_ctx_dstq + i;
+ ivk_cbk_ctx(ppkt_ctxt, chan,
+ DMA_TRANS_WRITE_FAILED);
+ memset(ppkt_ctxt, 0,
+ sizeof(struct PACKET_TRANSFER_PARAMS));
+ i++;
+ if (i == chan->total_descriptors)
+ i = 0;
+ }
+ }
+ }
+
+ list_for_each_entry_safe(seg, seg_nxt, &chan->active_list, node) {
+ ivk_cbk_seg(seg, chan, DMA_TRANS_ABORTED);
+ spin_lock(&chan->active_list_lock);
+ list_del(&seg->node);
+ spin_unlock(&chan->active_list_lock);
+ mempool_free(seg, chan->transactions_pool);
+ }
+
+ list_for_each_entry_safe(seg, seg_nxt, &chan->pending_list, node) {
+ ivk_cbk_seg(seg, chan, DMA_TRANS_ABORTED);
+ spin_lock(&chan->pending_list_lock);
+ list_del(&seg->node);
+ spin_unlock(&chan->pending_list_lock);
+ mempool_free(seg, chan->transactions_pool);
+ }
+
+ list_for_each_entry_safe(intr_seg, intr_seg_next,
+ &chan->active_interrupts_list, node) {
+ ivk_cbk_intr_seg(intr_seg, chan, DMA_TRANS_ABORTED);
+ spin_lock(&chan->active_interrupts_lock);
+ list_del(&intr_seg->node);
+ spin_unlock(&chan->active_interrupts_lock);
+ mempool_free(intr_seg, chan->intr_transactions_pool);
+ }
+
+ list_for_each_entry_safe(intr_seg, intr_seg_next,
+ &chan->pending_interrupts_list, node) {
+ ivk_cbk_intr_seg(intr_seg, chan, DMA_TRANS_ABORTED);
+ spin_lock(&chan->pending_interrupts_lock);
+ list_del(&intr_seg->node);
+ spin_unlock(&chan->pending_interrupts_lock);
+ mempool_free(intr_seg, chan->intr_transactions_pool);
+ }
+}
+
+static void xlnx_ps_pcie_reset_channel(struct ps_pcie_dma_chan *chan)
+{
+ xlnx_ps_pcie_channel_quiesce(chan);
+
+ ivk_cbk_for_pending(chan);
+
+ ps_pcie_chan_reset(chan);
+
+ init_sw_components(chan);
+ init_hw_components(chan);
+
+ xlnx_ps_pcie_channel_activate(chan);
+}
+
+static void xlnx_ps_pcie_free_poll_timer(struct ps_pcie_dma_chan *chan)
+{
+ if (chan->poll_timer.function) {
+ del_timer_sync(&chan->poll_timer);
+ chan->poll_timer.function = NULL;
+ }
+}
+
+static int xlnx_ps_pcie_alloc_poll_timer(struct ps_pcie_dma_chan *chan)
+{
+ init_timer(&chan->poll_timer);
+ chan->poll_timer.function = poll_completed_transactions;
+ chan->poll_timer.expires = jiffies + chan->poll_timer_freq;
+ chan->poll_timer.data = (unsigned long)chan;
+
+ add_timer(&chan->poll_timer);
+
+ return 0;
+}
+
+static void terminate_transactions_work(struct work_struct *work)
+{
+ struct ps_pcie_dma_chan *chan =
+ (struct ps_pcie_dma_chan *)container_of(work,
+ struct ps_pcie_dma_chan, handle_chan_terminate);
+
+ xlnx_ps_pcie_channel_quiesce(chan);
+ ivk_cbk_for_pending(chan);
+ xlnx_ps_pcie_channel_activate(chan);
+
+ complete(&chan->chan_terminate_complete);
+}
+
+static void chan_shutdown_work(struct work_struct *work)
+{
+ struct ps_pcie_dma_chan *chan =
+ (struct ps_pcie_dma_chan *)container_of(work,
+ struct ps_pcie_dma_chan, handle_chan_shutdown);
+
+ xlnx_ps_pcie_channel_quiesce(chan);
+
+ complete(&chan->chan_shutdown_complt);
+}
+
+static void chan_reset_work(struct work_struct *work)
+{
+ struct ps_pcie_dma_chan *chan =
+ (struct ps_pcie_dma_chan *)container_of(work,
+ struct ps_pcie_dma_chan, handle_chan_reset);
+
+ xlnx_ps_pcie_reset_channel(chan);
+}
+
+static void sw_intr_work(struct work_struct *work)
+{
+ struct ps_pcie_dma_chan *chan =
+ (struct ps_pcie_dma_chan *)container_of(work,
+ struct ps_pcie_dma_chan, handle_sw_intrs);
+ struct ps_pcie_intr_segment *intr_seg, *intr_seg_next;
+
+ list_for_each_entry_safe(intr_seg, intr_seg_next,
+ &chan->active_interrupts_list, node) {
+ spin_lock(&chan->cookie_lock);
+ dma_cookie_complete(&intr_seg->async_intr_tx);
+ spin_unlock(&chan->cookie_lock);
+ dmaengine_desc_get_callback_invoke(&intr_seg->async_intr_tx,
+ NULL);
+ spin_lock(&chan->active_interrupts_lock);
+ list_del(&intr_seg->node);
+ spin_unlock(&chan->active_interrupts_lock);
+ }
+}
+
+static int xlnx_ps_pcie_alloc_worker_threads(struct ps_pcie_dma_chan *chan)
+{
+ char wq_name[WORKQ_NAME_SIZE];
+
+ snprintf(wq_name, WORKQ_NAME_SIZE,
+ "PS PCIe channel %d descriptor programming wq",
+ chan->channel_number);
+ chan->chan_programming =
+ create_singlethread_workqueue((const char *)wq_name);
+ if (!chan->chan_programming) {
+ dev_err(chan->dev,
+ "Unable to create programming wq for chan %d",
+ chan->channel_number);
+ goto err_no_desc_program_wq;
+ } else {
+ INIT_WORK(&chan->handle_chan_programming,
+ ps_pcie_chan_program_work);
+ }
+ memset(wq_name, 0, WORKQ_NAME_SIZE);
+
+ snprintf(wq_name, WORKQ_NAME_SIZE,
+ "PS PCIe channel %d primary cleanup wq", chan->channel_number);
+ chan->primary_desc_cleanup =
+ create_singlethread_workqueue((const char *)wq_name);
+ if (!chan->primary_desc_cleanup) {
+ dev_err(chan->dev,
+ "Unable to create primary cleanup wq for channel %d",
+ chan->channel_number);
+ goto err_no_primary_clean_wq;
+ } else {
+ INIT_WORK(&chan->handle_primary_desc_cleanup,
+ ps_pcie_chan_primary_work);
+ }
+ memset(wq_name, 0, WORKQ_NAME_SIZE);
+
+ snprintf(wq_name, WORKQ_NAME_SIZE,
+ "PS PCIe channel %d maintenance works wq",
+ chan->channel_number);
+ chan->maintenance_workq =
+ create_singlethread_workqueue((const char *)wq_name);
+ if (!chan->maintenance_workq) {
+ dev_err(chan->dev,
+ "Unable to create maintenance wq for channel %d",
+ chan->channel_number);
+ goto err_no_maintenance_wq;
+ } else {
+ INIT_WORK(&chan->handle_chan_reset, chan_reset_work);
+ INIT_WORK(&chan->handle_chan_shutdown, chan_shutdown_work);
+ INIT_WORK(&chan->handle_chan_terminate,
+ terminate_transactions_work);
+ }
+ memset(wq_name, 0, WORKQ_NAME_SIZE);
+
+ snprintf(wq_name, WORKQ_NAME_SIZE,
+ "PS PCIe channel %d software Interrupts wq",
+ chan->channel_number);
+ chan->sw_intrs_wrkq =
+ create_singlethread_workqueue((const char *)wq_name);
+ if (!chan->sw_intrs_wrkq) {
+ dev_err(chan->dev,
+ "Unable to create sw interrupts wq for channel %d",
+ chan->channel_number);
+ goto err_no_sw_intrs_wq;
+ } else {
+ INIT_WORK(&chan->handle_sw_intrs, sw_intr_work);
+ }
+ memset(wq_name, 0, WORKQ_NAME_SIZE);
+
+ if (chan->psrc_sgl_bd) {
+ snprintf(wq_name, WORKQ_NAME_SIZE,
+ "PS PCIe channel %d srcq handling wq",
+ chan->channel_number);
+ chan->srcq_desc_cleanup =
+ create_singlethread_workqueue((const char *)wq_name);
+ if (!chan->srcq_desc_cleanup) {
+ dev_err(chan->dev,
+ "Unable to create src q completion wq chan %d",
+ chan->channel_number);
+ goto err_no_src_q_completion_wq;
+ } else {
+ INIT_WORK(&chan->handle_srcq_desc_cleanup,
+ src_cleanup_work);
+ }
+ memset(wq_name, 0, WORKQ_NAME_SIZE);
+ }
+
+ if (chan->pdst_sgl_bd) {
+ snprintf(wq_name, WORKQ_NAME_SIZE,
+ "PS PCIe channel %d dstq handling wq",
+ chan->channel_number);
+ chan->dstq_desc_cleanup =
+ create_singlethread_workqueue((const char *)wq_name);
+ if (!chan->dstq_desc_cleanup) {
+ dev_err(chan->dev,
+ "Unable to create dst q completion wq chan %d",
+ chan->channel_number);
+ goto err_no_dst_q_completion_wq;
+ } else {
+ INIT_WORK(&chan->handle_dstq_desc_cleanup,
+ dst_cleanup_work);
+ }
+ memset(wq_name, 0, WORKQ_NAME_SIZE);
+ }
+
+ return 0;
+err_no_dst_q_completion_wq:
+ if (chan->srcq_desc_cleanup)
+ destroy_workqueue(chan->srcq_desc_cleanup);
+err_no_src_q_completion_wq:
+ if (chan->sw_intrs_wrkq)
+ destroy_workqueue(chan->sw_intrs_wrkq);
+err_no_sw_intrs_wq:
+ if (chan->maintenance_workq)
+ destroy_workqueue(chan->maintenance_workq);
+err_no_maintenance_wq:
+ if (chan->primary_desc_cleanup)
+ destroy_workqueue(chan->primary_desc_cleanup);
+err_no_primary_clean_wq:
+ if (chan->chan_programming)
+ destroy_workqueue(chan->chan_programming);
+err_no_desc_program_wq:
+ return -ENOMEM;
+}
+
+static int xlnx_ps_pcie_alloc_mempool(struct ps_pcie_dma_chan *chan)
+{
+ chan->transactions_pool =
+ mempool_create_kmalloc_pool(chan->total_descriptors,
+ sizeof(struct ps_pcie_tx_segment));
+
+ if (!chan->transactions_pool)
+ goto no_transactions_pool;
+
+ chan->intr_transactions_pool =
+ mempool_create_kmalloc_pool(MIN_SW_INTR_TRANSACTIONS,
+ sizeof(struct ps_pcie_intr_segment));
+
+ if (!chan->intr_transactions_pool)
+ goto no_intr_transactions_pool;
+
+ return 0;
+
+no_intr_transactions_pool:
+ mempool_destroy(chan->transactions_pool);
+
+no_transactions_pool:
+ return -ENOMEM;
+}
+
+static int xlnx_ps_pcie_alloc_pkt_contexts(struct ps_pcie_dma_chan *chan)
+{
+ if (chan->psrc_sgl_bd) {
+ chan->ppkt_ctx_srcq =
+ kcalloc(chan->total_descriptors,
+ sizeof(struct PACKET_TRANSFER_PARAMS),
+ GFP_KERNEL);
+ if (!chan->ppkt_ctx_srcq) {
+ dev_err(chan->dev,
+ "Src pkt cxt allocation for chan %d failed\n",
+ chan->channel_number);
+ goto err_no_src_pkt_ctx;
+ }
+ }
+
+ if (chan->pdst_sgl_bd) {
+ chan->ppkt_ctx_dstq =
+ kcalloc(chan->total_descriptors,
+ sizeof(struct PACKET_TRANSFER_PARAMS),
+ GFP_KERNEL);
+ if (!chan->ppkt_ctx_dstq) {
+ dev_err(chan->dev,
+ "Dst pkt cxt for chan %d failed\n",
+ chan->channel_number);
+ goto err_no_dst_pkt_ctx;
+ }
+ }
+
+ return 0;
+
+err_no_dst_pkt_ctx:
+ kfree(chan->ppkt_ctx_srcq);
+
+err_no_src_pkt_ctx:
+ return -ENOMEM;
+}
+
+static int dma_alloc_descriptors_two_queues(struct ps_pcie_dma_chan *chan)
+{
+ size_t size;
+
+ void *sgl_base;
+ void *sta_base;
+ dma_addr_t phy_addr_sglbase;
+ dma_addr_t phy_addr_stabase;
+
+ size = chan->total_descriptors *
+ sizeof(struct SOURCE_DMA_DESCRIPTOR);
+
+ sgl_base = dma_zalloc_coherent(chan->dev, size, &phy_addr_sglbase,
+ GFP_KERNEL);
+
+ if (!sgl_base) {
+ dev_err(chan->dev,
+ "Sgl bds in two channel mode for chan %d failed\n",
+ chan->channel_number);
+ goto err_no_sgl_bds;
+ }
+
+ size = chan->total_descriptors * sizeof(struct STATUS_DMA_DESCRIPTOR);
+ sta_base = dma_zalloc_coherent(chan->dev, size, &phy_addr_stabase,
+ GFP_KERNEL);
+
+ if (!sta_base) {
+ dev_err(chan->dev,
+ "Sta bds in two channel mode for chan %d failed\n",
+ chan->channel_number);
+ goto err_no_sta_bds;
+ }
+
+ if (chan->direction == DMA_TO_DEVICE) {
+ chan->psrc_sgl_bd = sgl_base;
+ chan->src_sgl_bd_pa = phy_addr_sglbase;
+
+ chan->psrc_sta_bd = sta_base;
+ chan->src_sta_bd_pa = phy_addr_stabase;
+
+ chan->pdst_sgl_bd = NULL;
+ chan->dst_sgl_bd_pa = 0;
+
+ chan->pdst_sta_bd = NULL;
+ chan->dst_sta_bd_pa = 0;
+
+ } else if (chan->direction == DMA_FROM_DEVICE) {
+ chan->psrc_sgl_bd = NULL;
+ chan->src_sgl_bd_pa = 0;
+
+ chan->psrc_sta_bd = NULL;
+ chan->src_sta_bd_pa = 0;
+
+ chan->pdst_sgl_bd = sgl_base;
+ chan->dst_sgl_bd_pa = phy_addr_sglbase;
+
+ chan->pdst_sta_bd = sta_base;
+ chan->dst_sta_bd_pa = phy_addr_stabase;
+
+ } else {
+ dev_err(chan->dev,
+ "%d %s() Unsupported channel direction\n",
+ __LINE__, __func__);
+ goto unsupported_channel_direction;
+ }
+
+ return 0;
+
+unsupported_channel_direction:
+ size = chan->total_descriptors *
+ sizeof(struct STATUS_DMA_DESCRIPTOR);
+ dma_free_coherent(chan->dev, size, sta_base, phy_addr_stabase);
+err_no_sta_bds:
+ size = chan->total_descriptors *
+ sizeof(struct SOURCE_DMA_DESCRIPTOR);
+ dma_free_coherent(chan->dev, size, sgl_base, phy_addr_sglbase);
+err_no_sgl_bds:
+
+ return -ENOMEM;
+}
+
+static int dma_alloc_decriptors_all_queues(struct ps_pcie_dma_chan *chan)
+{
+ size_t size;
+
+ size = chan->total_descriptors *
+ sizeof(struct SOURCE_DMA_DESCRIPTOR);
+ chan->psrc_sgl_bd =
+ dma_zalloc_coherent(chan->dev, size, &chan->src_sgl_bd_pa,
+ GFP_KERNEL);
+
+ if (!chan->psrc_sgl_bd) {
+ dev_err(chan->dev,
+ "Alloc fail src q buffer descriptors for chan %d\n",
+ chan->channel_number);
+ goto err_no_src_sgl_descriptors;
+ }
+
+ size = chan->total_descriptors * sizeof(struct DEST_DMA_DESCRIPTOR);
+ chan->pdst_sgl_bd =
+ dma_zalloc_coherent(chan->dev, size, &chan->dst_sgl_bd_pa,
+ GFP_KERNEL);
+
+ if (!chan->pdst_sgl_bd) {
+ dev_err(chan->dev,
+ "Alloc fail dst q buffer descriptors for chan %d\n",
+ chan->channel_number);
+ goto err_no_dst_sgl_descriptors;
+ }
+
+ size = chan->total_descriptors * sizeof(struct STATUS_DMA_DESCRIPTOR);
+ chan->psrc_sta_bd =
+ dma_zalloc_coherent(chan->dev, size, &chan->src_sta_bd_pa,
+ GFP_KERNEL);
+
+ if (!chan->psrc_sta_bd) {
+ dev_err(chan->dev,
+ "Unable to allocate src q status bds for chan %d\n",
+ chan->channel_number);
+ goto err_no_src_sta_descriptors;
+ }
+
+ chan->pdst_sta_bd =
+ dma_zalloc_coherent(chan->dev, size, &chan->dst_sta_bd_pa,
+ GFP_KERNEL);
+
+ if (!chan->pdst_sta_bd) {
+ dev_err(chan->dev,
+ "Unable to allocate Dst q status bds for chan %d\n",
+ chan->channel_number);
+ goto err_no_dst_sta_descriptors;
+ }
+
+ return 0;
+
+err_no_dst_sta_descriptors:
+ size = chan->total_descriptors *
+ sizeof(struct STATUS_DMA_DESCRIPTOR);
+ dma_free_coherent(chan->dev, size, chan->psrc_sta_bd,
+ chan->src_sta_bd_pa);
+err_no_src_sta_descriptors:
+ size = chan->total_descriptors *
+ sizeof(struct DEST_DMA_DESCRIPTOR);
+ dma_free_coherent(chan->dev, size, chan->pdst_sgl_bd,
+ chan->dst_sgl_bd_pa);
+err_no_dst_sgl_descriptors:
+ size = chan->total_descriptors *
+ sizeof(struct SOURCE_DMA_DESCRIPTOR);
+ dma_free_coherent(chan->dev, size, chan->psrc_sgl_bd,
+ chan->src_sgl_bd_pa);
+
+err_no_src_sgl_descriptors:
+ return -ENOMEM;
+}
+
+static void xlnx_ps_pcie_dma_free_chan_resources(struct dma_chan *dchan)
+{
+ struct ps_pcie_dma_chan *chan;
+
+ if (!dchan)
+ return;
+
+ chan = to_xilinx_chan(dchan);
+
+ if (chan->state == CHANNEL_RESOURCE_UNALLOCATED)
+ return;
+
+ if (chan->maintenance_workq) {
+ if (completion_done(&chan->chan_shutdown_complt))
+ reinit_completion(&chan->chan_shutdown_complt);
+ queue_work(chan->maintenance_workq,
+ &chan->handle_chan_shutdown);
+ wait_for_completion_interruptible(&chan->chan_shutdown_complt);
+
+ xlnx_ps_pcie_free_worker_queues(chan);
+ xlnx_ps_pcie_free_pkt_ctxts(chan);
+ xlnx_ps_pcie_destroy_mempool(chan);
+ xlnx_ps_pcie_free_descriptors(chan);
+
+ spin_lock(&chan->channel_lock);
+ chan->state = CHANNEL_RESOURCE_UNALLOCATED;
+ spin_unlock(&chan->channel_lock);
+ }
+}
+
+static int xlnx_ps_pcie_dma_alloc_chan_resources(struct dma_chan *dchan)
+{
+ struct ps_pcie_dma_chan *chan;
+
+ if (!dchan)
+ return PTR_ERR(dchan);
+
+ chan = to_xilinx_chan(dchan);
+
+ if (chan->state != CHANNEL_RESOURCE_UNALLOCATED)
+ return 0;
+
+ if (chan->num_queues == DEFAULT_DMA_QUEUES) {
+ if (dma_alloc_decriptors_all_queues(chan) != 0) {
+ dev_err(chan->dev,
+ "Alloc fail bds for channel %d\n",
+ chan->channel_number);
+ goto err_no_descriptors;
+ }
+ } else if (chan->num_queues == TWO_DMA_QUEUES) {
+ if (dma_alloc_descriptors_two_queues(chan) != 0) {
+ dev_err(chan->dev,
+ "Alloc fail bds for two queues of channel %d\n",
+ chan->channel_number);
+ goto err_no_descriptors;
+ }
+ }
+
+ if (xlnx_ps_pcie_alloc_mempool(chan) != 0) {
+ dev_err(chan->dev,
+ "Unable to allocate memory pool for channel %d\n",
+ chan->channel_number);
+ goto err_no_mempools;
+ }
+
+ if (xlnx_ps_pcie_alloc_pkt_contexts(chan) != 0) {
+ dev_err(chan->dev,
+ "Unable to allocate packet contexts for channel %d\n",
+ chan->channel_number);
+ goto err_no_pkt_ctxts;
+ }
+
+ if (xlnx_ps_pcie_alloc_worker_threads(chan) != 0) {
+ dev_err(chan->dev,
+ "Unable to allocate worker queues for channel %d\n",
+ chan->channel_number);
+ goto err_no_worker_queues;
+ }
+
+ xlnx_ps_pcie_reset_channel(chan);
+
+ dma_cookie_init(dchan);
+
+ return 0;
+
+err_no_worker_queues:
+ xlnx_ps_pcie_free_pkt_ctxts(chan);
+err_no_pkt_ctxts:
+ xlnx_ps_pcie_destroy_mempool(chan);
+err_no_mempools:
+ xlnx_ps_pcie_free_descriptors(chan);
+err_no_descriptors:
+ return -ENOMEM;
+}
+
+static dma_cookie_t xilinx_intr_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+ struct ps_pcie_intr_segment *intr_seg =
+ to_ps_pcie_dma_tx_intr_descriptor(tx);
+ struct ps_pcie_dma_chan *chan = to_xilinx_chan(tx->chan);
+ dma_cookie_t cookie;
+
+ if (chan->state != CHANNEL_AVAILABLE)
+ return -EINVAL;
+
+ spin_lock(&chan->cookie_lock);
+ cookie = dma_cookie_assign(tx);
+ spin_unlock(&chan->cookie_lock);
+
+ spin_lock(&chan->pending_interrupts_lock);
+ list_add_tail(&intr_seg->node, &chan->pending_interrupts_list);
+ spin_unlock(&chan->pending_interrupts_lock);
+
+ return cookie;
+}
+
+static dma_cookie_t xilinx_dma_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+ struct ps_pcie_tx_segment *seg = to_ps_pcie_dma_tx_descriptor(tx);
+ struct ps_pcie_dma_chan *chan = to_xilinx_chan(tx->chan);
+ dma_cookie_t cookie;
+
+ if (chan->state != CHANNEL_AVAILABLE)
+ return -EINVAL;
+
+ spin_lock(&chan->cookie_lock);
+ cookie = dma_cookie_assign(tx);
+ spin_unlock(&chan->cookie_lock);
+
+ spin_lock(&chan->pending_list_lock);
+ list_add_tail(&seg->node, &chan->pending_list);
+ spin_unlock(&chan->pending_list_lock);
+
+ return cookie;
+}
+
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_dma_sg(
+ struct dma_chan *channel, struct scatterlist *dst_sg,
+ unsigned int dst_nents, struct scatterlist *src_sg,
+ unsigned int src_nents, unsigned long flags)
+{
+ struct ps_pcie_dma_chan *chan = to_xilinx_chan(channel);
+ struct ps_pcie_tx_segment *seg = NULL;
+
+ if (chan->state != CHANNEL_AVAILABLE)
+ return NULL;
+
+ if (dst_nents == 0 || src_nents == 0)
+ return NULL;
+
+ if (!dst_sg || !src_sg)
+ return NULL;
+
+ if (chan->num_queues != DEFAULT_DMA_QUEUES) {
+ dev_err(chan->dev, "Only prep_slave_sg for channel %d\n",
+ chan->channel_number);
+ return NULL;
+ }
+
+ seg = mempool_alloc(chan->transactions_pool, GFP_ATOMIC);
+ if (!seg) {
+ dev_err(chan->dev, "Tx segment alloc for channel %d\n",
+ chan->channel_number);
+ return NULL;
+ }
+
+ memset(seg, 0, sizeof(*seg));
+
+ seg->tx_elements.dst_sgl = dst_sg;
+ seg->tx_elements.dstq_num_elemets = dst_nents;
+ seg->tx_elements.src_sgl = src_sg;
+ seg->tx_elements.srcq_num_elemets = src_nents;
+
+ dma_async_tx_descriptor_init(&seg->async_tx, &chan->common);
+ seg->async_tx.flags = flags;
+ async_tx_ack(&seg->async_tx);
+ seg->async_tx.tx_submit = xilinx_dma_tx_submit;
+
+ return &seg->async_tx;
+}
+
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_slave_sg(
+ struct dma_chan *channel, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_transfer_direction direction,
+ unsigned long flags, void *context)
+{
+ struct ps_pcie_dma_chan *chan = to_xilinx_chan(channel);
+ struct ps_pcie_tx_segment *seg = NULL;
+
+ if (chan->state != CHANNEL_AVAILABLE)
+ return NULL;
+
+ if (!(is_slave_direction(direction)))
+ return NULL;
+
+ if (!sgl || sg_len == 0)
+ return NULL;
+
+ if (chan->num_queues != TWO_DMA_QUEUES) {
+ dev_err(chan->dev, "Only prep_dma_sg is supported channel %d\n",
+ chan->channel_number);
+ return NULL;
+ }
+
+ seg = mempool_alloc(chan->transactions_pool, GFP_ATOMIC);
+ if (!seg) {
+ dev_err(chan->dev, "Unable to allocate tx segment channel %d\n",
+ chan->channel_number);
+ return NULL;
+ }
+
+ memset(seg, 0, sizeof(*seg));
+
+ if (chan->direction == DMA_TO_DEVICE) {
+ seg->tx_elements.src_sgl = sgl;
+ seg->tx_elements.srcq_num_elemets = sg_len;
+ seg->tx_elements.dst_sgl = NULL;
+ seg->tx_elements.dstq_num_elemets = 0;
+ } else {
+ seg->tx_elements.src_sgl = NULL;
+ seg->tx_elements.srcq_num_elemets = 0;
+ seg->tx_elements.dst_sgl = sgl;
+ seg->tx_elements.dstq_num_elemets = sg_len;
+ }
+
+ dma_async_tx_descriptor_init(&seg->async_tx, &chan->common);
+ seg->async_tx.flags = flags;
+ async_tx_ack(&seg->async_tx);
+ seg->async_tx.tx_submit = xilinx_dma_tx_submit;
+
+ return &seg->async_tx;
+}
+
+static void xlnx_ps_pcie_dma_issue_pending(struct dma_chan *channel)
+{
+ struct ps_pcie_dma_chan *chan;
+
+ if (!channel)
+ return;
+
+ chan = to_xilinx_chan(channel);
+
+ if (!list_empty(&chan->pending_list)) {
+ spin_lock(&chan->pending_list_lock);
+ spin_lock(&chan->active_list_lock);
+ list_splice_tail_init(&chan->pending_list,
+ &chan->active_list);
+ spin_unlock(&chan->active_list_lock);
+ spin_unlock(&chan->pending_list_lock);
+ }
+
+ if (!list_empty(&chan->pending_interrupts_list)) {
+ spin_lock(&chan->pending_interrupts_lock);
+ spin_lock(&chan->active_interrupts_lock);
+ list_splice_tail_init(&chan->pending_interrupts_list,
+ &chan->active_interrupts_list);
+ spin_unlock(&chan->active_interrupts_lock);
+ spin_unlock(&chan->pending_interrupts_lock);
+ }
+
+ if (chan->chan_programming)
+ queue_work(chan->chan_programming,
+ &chan->handle_chan_programming);
+}
+
+static int xlnx_ps_pcie_dma_terminate_all(struct dma_chan *channel)
+{
+ struct ps_pcie_dma_chan *chan;
+
+ if (!channel)
+ return PTR_ERR(channel);
+
+ chan = to_xilinx_chan(channel);
+
+ if (chan->state != CHANNEL_AVAILABLE)
+ return 1;
+
+ if (chan->maintenance_workq) {
+ if (completion_done(&chan->chan_terminate_complete))
+ reinit_completion(&chan->chan_terminate_complete);
+ queue_work(chan->maintenance_workq,
+ &chan->handle_chan_terminate);
+ wait_for_completion_interruptible(
+ &chan->chan_terminate_complete);
+ }
+
+ return 0;
+}
+
+static struct dma_async_tx_descriptor *xlnx_ps_pcie_dma_prep_interrupt(
+ struct dma_chan *channel, unsigned long flags)
+{
+ struct ps_pcie_dma_chan *chan;
+ struct ps_pcie_intr_segment *intr_segment = NULL;
+
+ if (!channel)
+ return NULL;
+
+ chan = to_xilinx_chan(channel);
+
+ if (chan->state != CHANNEL_AVAILABLE)
+ return NULL;
+
+ intr_segment = mempool_alloc(chan->intr_transactions_pool, GFP_ATOMIC);
+
+ memset(intr_segment, 0, sizeof(*intr_segment));
+
+ dma_async_tx_descriptor_init(&intr_segment->async_intr_tx,
+ &chan->common);
+ intr_segment->async_intr_tx.flags = flags;
+ async_tx_ack(&intr_segment->async_intr_tx);
+ intr_segment->async_intr_tx.tx_submit = xilinx_intr_tx_submit;
+
+ return &intr_segment->async_intr_tx;
+}
+
+static int read_rootdma_config(struct platform_device *platform_dev,
+ struct xlnx_pcie_dma_device *xdev)
+{
+ int err;
+ struct resource *r;
+
+ err = dma_set_mask(&platform_dev->dev, DMA_BIT_MASK(64));
+ if (err) {
+ dev_info(&platform_dev->dev, "Cannot set 64 bit DMA mask\n");
+ err = dma_set_mask(&platform_dev->dev, DMA_BIT_MASK(32));
+ if (err) {
+ dev_err(&platform_dev->dev, "DMA mask set error\n");
+ return err;
+ }
+ }
+
+ err = dma_set_coherent_mask(&platform_dev->dev, DMA_BIT_MASK(64));
+ if (err) {
+ dev_info(&platform_dev->dev, "Cannot set 64 bit consistent DMA mask\n");
+ err = dma_set_coherent_mask(&platform_dev->dev,
+ DMA_BIT_MASK(32));
+ if (err) {
+ dev_err(&platform_dev->dev, "Cannot set consistent DMA mask\n");
+ return err;
+ }
+ }
+
+ r = platform_get_resource_byname(platform_dev, IORESOURCE_MEM,
+ "ps_pcie_regbase");
+ if (!r) {
+ dev_err(&platform_dev->dev,
+ "Unable to find memory resource for root dma\n");
+ return PTR_ERR(r);
+ }
+
+ xdev->reg_base = devm_ioremap_resource(&platform_dev->dev, r);
+ if (IS_ERR(xdev->reg_base)) {
+ dev_err(&platform_dev->dev, "ioresource error for root dma\n");
+ return PTR_ERR(xdev->reg_base);
+ }
+
+ xdev->platform_irq_vec =
+ platform_get_irq_byname(platform_dev,
+ "ps_pcie_rootdma_intr");
+ if (xdev->platform_irq_vec < 0) {
+ dev_err(&platform_dev->dev,
+ "Unable to get interrupt number for root dma\n");
+ return xdev->platform_irq_vec;
+ }
+
+ err = device_property_read_u16(&platform_dev->dev, "dma_vendorid",
+ &xdev->rootdma_vendor);
+ if (err) {
+ dev_err(&platform_dev->dev,
+ "Unable to find RootDMA PCI Vendor Id\n");
+ return err;
+ }
+
+ err = device_property_read_u16(&platform_dev->dev, "dma_deviceid",
+ &xdev->rootdma_device);
+ if (err) {
+ dev_err(&platform_dev->dev,
+ "Unable to find RootDMA PCI Device Id\n");
+ return err;
+ }
+
+ xdev->common.dev = xdev->dev;
+
+ return 0;
+}
+
+static int read_epdma_config(struct platform_device *platform_dev,
+ struct xlnx_pcie_dma_device *xdev)
+{
+ int err;
+ struct pci_dev *pdev;
+ u16 i;
+ void __iomem * const *pci_iomap;
+ unsigned long pci_bar_length;
+
+ pdev = *((struct pci_dev **)(platform_dev->dev.platform_data));
+ xdev->pci_dev = pdev;
+
+ for (i = 0; i < MAX_BARS; i++) {
+ if (pci_resource_len(pdev, i) == 0)
+ continue;
+ xdev->bar_mask = xdev->bar_mask | (1 << (i));
+ }
+
+ err = pcim_iomap_regions(pdev, xdev->bar_mask, PLATFORM_DRIVER_NAME);
+ if (err) {
+ dev_err(&pdev->dev, "Cannot request PCI regions, aborting\n");
+ return err;
+ }
+
+ pci_iomap = pcim_iomap_table(pdev);
+ if (!pci_iomap) {
+ err = -ENOMEM;
+ return err;
+ }
+
+ for (i = 0; i < MAX_BARS; i++) {
+ pci_bar_length = pci_resource_len(pdev, i);
+ if (pci_bar_length == 0) {
+ xdev->bar_info[i].BAR_LENGTH = 0;
+ xdev->bar_info[i].BAR_PHYS_ADDR = 0;
+ xdev->bar_info[i].BAR_VIRT_ADDR = NULL;
+ } else {
+ xdev->bar_info[i].BAR_LENGTH =
+ pci_bar_length;
+ xdev->bar_info[i].BAR_PHYS_ADDR =
+ pci_resource_start(pdev, i);
+ xdev->bar_info[i].BAR_VIRT_ADDR =
+ pci_iomap[i];
+ }
+ }
+
+ xdev->reg_base = pci_iomap[DMA_BAR_NUMBER];
+
+ err = irq_probe(xdev);
+ if (err < 0) {
+ dev_err(&pdev->dev, "Cannot probe irq lines for device %d\n",
+ platform_dev->id);
+ return err;
+ }
+
+ xdev->common.dev = &pdev->dev;
+
+ return 0;
+}
+
+static int xlnx_pcie_dma_driver_probe(struct platform_device *platform_dev)
+{
+ int err, i;
+ struct xlnx_pcie_dma_device *xdev;
+ static u16 board_number;
+
+ xdev = devm_kzalloc(&platform_dev->dev,
+ sizeof(struct xlnx_pcie_dma_device), GFP_KERNEL);
+
+ if (!xdev)
+ return -ENOMEM;
+
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ xdev->dma_buf_ext_addr = true;
+#else
+ xdev->dma_buf_ext_addr = false;
+#endif
+
+ xdev->is_rootdma = device_property_read_bool(&platform_dev->dev,
+ "rootdma");
+
+ xdev->dev = &platform_dev->dev;
+ xdev->board_number = board_number;
+
+ err = device_property_read_u32(&platform_dev->dev, "numchannels",
+ &xdev->num_channels);
+ if (err) {
+ dev_err(&platform_dev->dev,
+ "Unable to find numchannels property\n");
+ goto platform_driver_probe_return;
+ }
+
+ if (xdev->num_channels == 0 || xdev->num_channels >
+ MAX_ALLOWED_CHANNELS_IN_HW) {
+ dev_warn(&platform_dev->dev,
+ "Invalid xlnx-num_channels property value\n");
+ xdev->num_channels = MAX_ALLOWED_CHANNELS_IN_HW;
+ }
+
+ xdev->channels =
+ (struct ps_pcie_dma_chan *)devm_kzalloc(&platform_dev->dev,
+ sizeof(struct ps_pcie_dma_chan)
+ * xdev->num_channels,
+ GFP_KERNEL);
+ if (!xdev->channels) {
+ err = -ENOMEM;
+ goto platform_driver_probe_return;
+ }
+
+ if (xdev->is_rootdma)
+ err = read_rootdma_config(platform_dev, xdev);
+ else
+ err = read_epdma_config(platform_dev, xdev);
+
+ if (err) {
+ dev_err(&platform_dev->dev,
+ "Unable to initialize dma configuration\n");
+ goto platform_driver_probe_return;
+ }
+
+ /* Initialize the DMA engine */
+ INIT_LIST_HEAD(&xdev->common.channels);
+
+ dma_cap_set(DMA_SLAVE, xdev->common.cap_mask);
+ dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask);
+ dma_cap_set(DMA_SG, xdev->common.cap_mask);
+ dma_cap_set(DMA_INTERRUPT, xdev->common.cap_mask);
+
+ xdev->common.src_addr_widths = DMA_SLAVE_BUSWIDTH_UNDEFINED;
+ xdev->common.dst_addr_widths = DMA_SLAVE_BUSWIDTH_UNDEFINED;
+ xdev->common.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+ xdev->common.device_alloc_chan_resources =
+ xlnx_ps_pcie_dma_alloc_chan_resources;
+ xdev->common.device_free_chan_resources =
+ xlnx_ps_pcie_dma_free_chan_resources;
+ xdev->common.device_terminate_all = xlnx_ps_pcie_dma_terminate_all;
+ xdev->common.device_tx_status = dma_cookie_status;
+ xdev->common.device_issue_pending = xlnx_ps_pcie_dma_issue_pending;
+ xdev->common.device_prep_dma_interrupt =
+ xlnx_ps_pcie_dma_prep_interrupt;
+ xdev->common.device_prep_dma_sg = xlnx_ps_pcie_dma_prep_dma_sg;
+ xdev->common.device_prep_slave_sg = xlnx_ps_pcie_dma_prep_slave_sg;
+ xdev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
+
+ for (i = 0; i < xdev->num_channels; i++) {
+ err = probe_channel_properties(platform_dev, xdev, i);
+
+ if (err != 0) {
+ dev_err(xdev->dev,
+ "Unable to read channel properties\n");
+ goto platform_driver_probe_return;
+ }
+ }
+
+ if (xdev->is_rootdma)
+ err = platform_irq_setup(xdev);
+ else
+ err = irq_setup(xdev);
+ if (err) {
+ dev_err(xdev->dev, "Cannot request irq lines for device %d\n",
+ xdev->board_number);
+ goto platform_driver_probe_return;
+ }
+
+ err = dma_async_device_register(&xdev->common);
+ if (err) {
+ dev_err(xdev->dev,
+ "Unable to register board %d with dma framework\n",
+ xdev->board_number);
+ goto platform_driver_probe_return;
+ }
+
+ platform_set_drvdata(platform_dev, xdev);
+
+ board_number++;
+
+ dev_info(&platform_dev->dev, "PS PCIe Platform driver probed\n");
+ return 0;
+
+platform_driver_probe_return:
+ return err;
+}
+
+static int xlnx_pcie_dma_driver_remove(struct platform_device *platform_dev)
+{
+ struct xlnx_pcie_dma_device *xdev =
+ platform_get_drvdata(platform_dev);
+ int i;
+
+ for (i = 0; i < xdev->num_channels; i++)
+ xlnx_ps_pcie_dma_free_chan_resources(&xdev->channels[i].common);
+
+ dma_async_device_unregister(&xdev->common);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id xlnx_pcie_root_dma_of_ids[] = {
+ { .compatible = "xlnx,ps_pcie_dma-1.00.a", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, xlnx_pcie_root_dma_of_ids);
+#else
+#define xlnx_pcie_root_dma_of_ids
+#endif
+
+static struct platform_driver xlnx_pcie_dma_driver = {
+ .driver = {
+ .name = XLNX_PLATFORM_DRIVER_NAME,
+ .of_match_table = xlnx_pcie_root_dma_of_ids,
+ .owner = THIS_MODULE,
+ },
+ .probe = xlnx_pcie_dma_driver_probe,
+ .remove = xlnx_pcie_dma_driver_remove,
+};
+
+int dma_platform_driver_register(void)
+{
+ return platform_driver_register(&xlnx_pcie_dma_driver);
+}
+
+void dma_platform_driver_unregister(void)
+{
+ platform_driver_unregister(&xlnx_pcie_dma_driver);
+}
diff --git a/include/linux/dma/xilinx_ps_pcie_dma.h b/include/linux/dma/xilinx_ps_pcie_dma.h
new file mode 100644
index 0000000..d11323a
--- /dev/null
+++ b/include/linux/dma/xilinx_ps_pcie_dma.h
@@ -0,0 +1,69 @@
+/*
+ * Xilinx PS PCIe DMA Engine support header file
+ *
+ * Copyright (C) 2017 Xilinx, Inc. All rights reserved.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation
+ */
+
+#ifndef __DMA_XILINX_PS_PCIE_H
+#define __DMA_XILINX_PS_PCIE_H
+
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+
+#define XLNX_PLATFORM_DRIVER_NAME "xlnx-platform-dma-driver"
+
+#define ZYNQMP_DMA_DEVID (0xD024)
+#define ZYNQMP_RC_DMA_DEVID (0xD021)
+
+#define MAX_ALLOWED_CHANNELS_IN_HW 4
+
+#define MAX_NUMBER_OF_CHANNELS MAX_ALLOWED_CHANNELS_IN_HW
+
+#define DEFAULT_DMA_QUEUES 4
+#define TWO_DMA_QUEUES 2
+
+#define NUMBER_OF_BUFFER_DESCRIPTORS 1999
+#define MAX_DESCRIPTORS 65536
+
+#define CHANNEL_COAELSE_COUNT 0
+
+#define CHANNEL_POLL_TIMER_FREQUENCY 1000 /* in milli seconds */
+
+#define PCIE_AXI_DIRECTION DMA_TO_DEVICE
+#define AXI_PCIE_DIRECTION DMA_FROM_DEVICE
+
+/**
+ * struct BAR_PARAMS - PCIe Bar Parameters
+ * @BAR_PHYS_ADDR: PCIe BAR Physical address
+ * @BAR_LENGTH: Length of PCIe BAR
+ * @BAR_VIRT_ADDR: Virtual Address to access PCIe BAR
+ */
+struct BAR_PARAMS {
+ dma_addr_t BAR_PHYS_ADDR; /**< Base physical address of BAR memory */
+ unsigned long BAR_LENGTH; /**< Length of BAR memory window */
+ void *BAR_VIRT_ADDR; /**< Virtual Address of mapped BAR memory */
+};
+
+/**
+ * struct ps_pcie_dma_channel_match - Match structure for dma clients
+ * @pci_vendorid: PCIe Vendor id of PS PCIe DMA device
+ * @pci_deviceid: PCIe Device id of PS PCIe DMA device
+ * @board_number: Unique id to identify individual device in a system
+ * @channel_number: Unique channel number of the device
+ * @direction: DMA channel direction
+ * @bar_params: Pointer to BAR_PARAMS for accessing application specific data
+ */
+struct ps_pcie_dma_channel_match {
+ u16 pci_vendorid;
+ u16 pci_deviceid;
+ u16 board_number;
+ u16 channel_number;
+ enum dma_data_direction direction;
+ struct BAR_PARAMS *bar_params;
+};
+
+#endif
--
2.1.1

Next message: Lee Jones: "Re: [PATCH v4 03/17] mfd: madera: Add common support for Cirrus Logic Madera codecs"
Previous message: Marcel Holtmann: "Re: [PATCH 0/6] In-kernel QMI handling"
In reply to: Ravi Shankar Jonnalagadda: "[PATCH 1/4] PCI:xilinx-nwl: Enable Root DMA"
Next in thread: Ravi Shankar Jonnalagadda: "[PATCH 2/4] PCI:xilinx-nwl: Correcting Styling checks"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]