Re: [PATCH v7 1/4] pci:host: APM X-Gene PCIe host controller driver

From: Tanmay Inamdar
Date: Thu Sep 11 2014 - 12:04:37 EST

On Thu, Sep 11, 2014 at 4:12 AM, Liviu Dudau <Liviu.Dudau@xxxxxxx> wrote:
> On Thu, Sep 11, 2014 at 12:20:17AM +0100, Tanmay Inamdar wrote:
>> This patch adds the AppliedMicro X-Gene SOC PCIe host controller driver.
>> X-Gene PCIe controller supports maximum up to 8 lanes and GEN3 speed.
>> X-Gene SOC supports maximum 5 PCIe ports.
>>
>> Signed-off-by: Tanmay Inamdar <tinamdar@xxxxxxx>
>
> Hi Tanmay,
>
> Some comment below:
>
>> ---
>> drivers/pci/host/Kconfig | 10 +
>> drivers/pci/host/Makefile | 1 +
>> drivers/pci/host/pci-xgene.c | 647 +++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 658 insertions(+)
>> create mode 100644 drivers/pci/host/pci-xgene.c
>>
>> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
>> index 90f5cca..382fd3d 100644
>> --- a/drivers/pci/host/Kconfig
>> +++ b/drivers/pci/host/Kconfig
>> @@ -63,4 +63,14 @@ config PCIE_SPEAR13XX
>> help
>> Say Y here if you want PCIe support on SPEAr13XX SoCs.
>>
>> +config PCI_XGENE
>> + bool "X-Gene PCIe controller"
>> + depends on ARCH_XGENE
>> + depends on OF
>> + select PCIEPORTBUS
>> + help
>> + Say Y here if you want internal PCI support on APM X-Gene SoC.
>> + There are 5 internal PCIe ports available. Each port is GEN3 capable
>> + and have varied lanes from x1 to x8.
>> +
>> endmenu
>> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
>> index d0e88f1..845611f 100644
>> --- a/drivers/pci/host/Makefile
>> +++ b/drivers/pci/host/Makefile
>> @@ -8,3 +8,4 @@ obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
>> obj-$(CONFIG_PCI_RCAR_GEN2_PCIE) += pcie-rcar.o
>> obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
>> obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
>> +obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
>> diff --git a/drivers/pci/host/pci-xgene.c b/drivers/pci/host/pci-xgene.c
>> new file mode 100644
>> index 0000000..15e0a98
>> --- /dev/null
>> +++ b/drivers/pci/host/pci-xgene.c
>> @@ -0,0 +1,647 @@
>> +/**
>> + * APM X-Gene PCIe Driver
>> + *
>> + * Copyright (c) 2014 Applied Micro Circuits Corporation.
>> + *
>> + * Author: Tanmay Inamdar <tinamdar@xxxxxxx>.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License as published by the
>> + * Free Software Foundation; either version 2 of the License, or (at your
>> + * option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +#include <linux/clk-private.h>
>> +#include <linux/delay.h>
>> +#include <linux/io.h>
>> +#include <linux/jiffies.h>
>> +#include <linux/memblock.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/of_pci.h>
>> +#include <linux/pci.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/slab.h>
>> +
>> +#define PCIECORE_CTLANDSTATUS 0x50
>> +#define PIM1_1L 0x80
>> +#define IBAR2 0x98
>> +#define IR2MSK 0x9c
>> +#define PIM2_1L 0xa0
>> +#define IBAR3L 0xb4
>> +#define IR3MSKL 0xbc
>> +#define PIM3_1L 0xc4
>> +#define OMR1BARL 0x100
>> +#define OMR2BARL 0x118
>> +#define OMR3BARL 0x130
>> +#define CFGBARL 0x154
>> +#define CFGBARH 0x158
>> +#define CFGCTL 0x15c
>> +#define RTDID 0x160
>> +#define BRIDGE_CFG_4 0x2010
>> +#define BRIDGE_STATUS_0 0x2600
>> +
>> +#define LINK_UP_MASK 0x00000100
>> +#define AXI_EP_CFG_ACCESS 0x10000
>> +#define EN_COHERENCY 0xF0000000
>> +#define EN_REG 0x00000001
>> +#define OB_LO_IO 0x00000002
>> +#define XGENE_PCIE_VENDORID 0x10E8
>> +#define XGENE_PCIE_DEVICEID 0xE004
>> +#define SZ_1T (SZ_1G*1024ULL)
>> +#define PIPE_PHY_RATE_RD(src) ((0xc000 & (u32)(src)) >> 0xe)
>> +
>> +struct xgene_pcie_port {
>> + struct device_node *node;
>> + struct device *dev;
>> + struct clk *clk;
>> + void __iomem *csr_base;
>> + void __iomem *cfg_base;
>> + unsigned long cfg_addr;
>> + bool link_up;
>> +};
>> +
>> +static inline u32 pcie_bar_low_val(u32 addr, u32 flags)
>> +{
>> + return (addr & PCI_BASE_ADDRESS_MEM_MASK) | flags;
>> +}
>> +
>> +/* PCIE Configuration Out/In */
>> +static inline void xgene_pcie_cfg_out32(void __iomem *addr, int offset, u32 val)
>> +{
>> + writel(val, addr + offset);
>> +}
>> +
>> +static inline void xgene_pcie_cfg_out16(void __iomem *addr, int offset, u16 val)
>> +{
>> + u32 val32 = readl(addr + (offset & ~0x3));
>> +
>> + switch (offset & 0x3) {
>> + case 2:
>> + val32 &= ~0xFFFF0000;
>> + val32 |= (u32)val << 16;
>> + break;
>> + case 0:
>> + default:
>> + val32 &= ~0xFFFF;
>> + val32 |= val;
>> + break;
>> + }
>> + writel(val32, addr + (offset & ~0x3));
>> +}
>> +
>> +static inline void xgene_pcie_cfg_out8(void __iomem *addr, int offset, u8 val)
>> +{
>> + u32 val32 = readl(addr + (offset & ~0x3));
>> +
>> + switch (offset & 0x3) {
>> + case 0:
>> + val32 &= ~0xFF;
>> + val32 |= val;
>> + break;
>> + case 1:
>> + val32 &= ~0xFF00;
>> + val32 |= (u32)val << 8;
>> + break;
>> + case 2:
>> + val32 &= ~0xFF0000;
>> + val32 |= (u32)val << 16;
>> + break;
>> + case 3:
>> + default:
>> + val32 &= ~0xFF000000;
>> + val32 |= (u32)val << 24;
>> + break;
>> + }
>> + writel(val32, addr + (offset & ~0x3));
>> +}
>> +
>> +static inline void xgene_pcie_cfg_in32(void __iomem *addr, int offset, u32 *val)
>> +{
>> + *val = readl(addr + offset);
>> +}
>> +
>> +static inline void
>> +xgene_pcie_cfg_in16(void __iomem *addr, int offset, u32 *val)
>> +{
>> + *val = readl(addr + (offset & ~0x3));
>> +
>> + switch (offset & 0x3) {
>> + case 2:
>> + *val >>= 16;
>> + break;
>> + }
>> +
>> + *val &= 0xFFFF;
>> +}
>> +
>> +static inline void
>> +xgene_pcie_cfg_in8(void __iomem *addr, int offset, u32 *val)
>> +{
>> + *val = readl(addr + (offset & ~0x3));
>> +
>> + switch (offset & 0x3) {
>> + case 3:
>> + *val = *val >> 24;
>> + break;
>> + case 2:
>> + *val = *val >> 16;
>> + break;
>> + case 1:
>> + *val = *val >> 8;
>> + break;
>> + }
>> + *val &= 0xFF;
>> +}
>> +
>> +/* When the address bit [17:16] is 2'b01, the Configuration access will be
>> + * treated as Type 1 and it will be forwarded to external PCIe device.
>> + */
>> +static void __iomem *xgene_pcie_get_cfg_base(struct pci_bus *bus)
>> +{
>> + struct xgene_pcie_port *port = bus->sysdata;
>> +
>> + if (bus->number >= (bus->primary + 1))
>> + return port->cfg_base + AXI_EP_CFG_ACCESS;
>> +
>> + return port->cfg_base;
>> +}
>> +
>> +/* For Configuration request, RTDID register is used as Bus Number,
>> + * Device Number and Function number of the header fields.
>> + */
>> +static void xgene_pcie_set_rtdid_reg(struct pci_bus *bus, uint devfn)
>> +{
>> + struct xgene_pcie_port *port = bus->sysdata;
>> + unsigned int b, d, f;
>> + u32 rtdid_val = 0;
>> +
>> + b = bus->number;
>> + d = PCI_SLOT(devfn);
>> + f = PCI_FUNC(devfn);
>> +
>> + if (!pci_is_root_bus(bus))
>> + rtdid_val = (b << 8) | (d << 3) | f;
>> +
>> + writel(rtdid_val, port->csr_base + RTDID);
>> + /* read the register back to ensure flush */
>> + readl(port->csr_base + RTDID);
>> +}
>> +
>> +static int xgene_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
>> + int offset, int len, u32 *val)
>> +{
>> + struct xgene_pcie_port *port = bus->sysdata;
>> + void __iomem *addr;
>> +
>> + if ((pci_is_root_bus(bus) && devfn != 0) || !port->link_up)
>> + return PCIBIOS_DEVICE_NOT_FOUND;
>> +
>> + xgene_pcie_set_rtdid_reg(bus, devfn);
>> + addr = xgene_pcie_get_cfg_base(bus);
>> + switch (len) {
>> + case 1:
>> + xgene_pcie_cfg_in8(addr, offset, val);
>> + break;
>> + case 2:
>> + xgene_pcie_cfg_in16(addr, offset, val);
>> + break;
>> + default:
>> + xgene_pcie_cfg_in32(addr, offset, val);
>> + break;
>> + }
>> + return PCIBIOS_SUCCESSFUL;
>> +}
>> +
>> +static int xgene_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
>> + int offset, int len, u32 val)
>> +{
>> + struct xgene_pcie_port *port = bus->sysdata;
>> + void __iomem *addr;
>> +
>> + if ((pci_is_root_bus(bus) && devfn != 0) || !port->link_up)
>> + return PCIBIOS_DEVICE_NOT_FOUND;
>> +
>> + xgene_pcie_set_rtdid_reg(bus, devfn);
>> + addr = xgene_pcie_get_cfg_base(bus);
>> + switch (len) {
>> + case 1:
>> + xgene_pcie_cfg_out8(addr, offset, (u8)val);
>> + break;
>> + case 2:
>> + xgene_pcie_cfg_out16(addr, offset, (u16)val);
>> + break;
>> + default:
>> + xgene_pcie_cfg_out32(addr, offset, val);
>> + break;
>> + }
>> +
>> + return PCIBIOS_SUCCESSFUL;
>> +}
>> +
>> +static struct pci_ops xgene_pcie_ops = {
>> + .read = xgene_pcie_read_config,
>> + .write = xgene_pcie_write_config
>> +};
>> +
>> +static u64 xgene_pcie_set_ib_mask(void __iomem *csr_base, u32 addr,
>> + u32 flags, u64 size)
>> +{
>> + u64 mask = (~(size - 1) & PCI_BASE_ADDRESS_MEM_MASK) | flags;
>> + u32 val32 = 0;
>> + u32 val;
>> +
>> + val32 = readl(csr_base + addr);
>> + val = (val32 & 0x0000ffff) | (lower_32_bits(mask) << 16);
>> + writel(val, csr_base + addr);
>> +
>> + val32 = readl(csr_base + addr + 0x04);
>> + val = (val32 & 0xffff0000) | (lower_32_bits(mask) >> 16);
>> + writel(val, csr_base + addr + 0x04);
>> +
>> + val32 = readl(csr_base + addr + 0x04);
>> + val = (val32 & 0x0000ffff) | (upper_32_bits(mask) << 16);
>> + writel(val, csr_base + addr + 0x04);
>> +
>> + val32 = readl(csr_base + addr + 0x08);
>> + val = (val32 & 0xffff0000) | (upper_32_bits(mask) >> 16);
>> + writel(val, csr_base + addr + 0x08);
>> +
>> + return mask;
>> +}
>> +
>> +static void xgene_pcie_linkup(struct xgene_pcie_port *port,
>> + u32 *lanes, u32 *speed)
>> +{
>> + void __iomem *csr_base = port->csr_base;
>> + u32 val32;
>> +
>> + port->link_up = false;
>> + val32 = readl(csr_base + PCIECORE_CTLANDSTATUS);
>> + if (val32 & LINK_UP_MASK) {
>> + port->link_up = true;
>> + *speed = PIPE_PHY_RATE_RD(val32);
>> + val32 = readl(csr_base + BRIDGE_STATUS_0);
>> + *lanes = val32 >> 26;
>> + }
>> +}
>> +
>> +static int xgene_pcie_init_port(struct xgene_pcie_port *port)
>> +{
>> + int rc;
>> +
>> + port->clk = clk_get(port->dev, NULL);
>> + if (IS_ERR(port->clk)) {
>> + dev_err(port->dev, "clock not available\n");
>> + return -ENODEV;
>> + }
>> +
>> + rc = clk_prepare_enable(port->clk);
>> + if (rc) {
>> + dev_err(port->dev, "clock enable failed\n");
>> + return rc;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void xgene_pcie_fixup_bridge(struct pci_dev *dev)
>> +{
>> + int i;
>> +
>> + /* Hide the PCI host BARs from the kernel as their content doesn't
>> + * fit well in the resource management
>> + */
>> + for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
>> + dev->resource[i].start = dev->resource[i].end = 0;
>> + dev->resource[i].flags = 0;
>> + }
>> + dev_info(&dev->dev, "Hiding X-Gene pci host bridge resources %s\n",
>> + pci_name(dev));
>> +}
>> +DECLARE_PCI_FIXUP_HEADER(XGENE_PCIE_VENDORID, XGENE_PCIE_DEVICEID,
>> + xgene_pcie_fixup_bridge);
>> +
>> +static int xgene_pcie_map_reg(struct xgene_pcie_port *port,
>> + struct platform_device *pdev)
>> +{
>> + struct resource *res;
>> +
>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "csr");
>> + port->csr_base = devm_ioremap_resource(port->dev, res);
>> + if (IS_ERR(port->csr_base))
>> + return PTR_ERR(port->csr_base);
>> +
>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
>> + port->cfg_base = devm_ioremap_resource(port->dev, res);
>> + if (IS_ERR(port->cfg_base))
>> + return PTR_ERR(port->cfg_base);
>> + port->cfg_addr = res->start;
>> +
>> + return 0;
>> +}
>> +
>> +static void xgene_pcie_setup_ob_reg(struct xgene_pcie_port *port,
>> + struct resource *res, u32 offset, u64 addr)
>> +{
>> + void __iomem *base = port->csr_base + offset;
>> + resource_size_t size = resource_size(res);
>> + u64 restype = resource_type(res);
>> + u64 cpu_addr, pci_addr;
>> + u64 mask = 0;
>> + u32 min_size;
>> + u32 flag = EN_REG;
>> +
>> + if (restype == IORESOURCE_MEM) {
>> + cpu_addr = res->start;
>> + pci_addr = addr;
>> + min_size = SZ_128M;
>> + } else {
>> + cpu_addr = addr;
>> + pci_addr = res->start;
>
> Not sure this is entirely correct if you have a system with another host bridge
> (i.e. your IO ports are going to be offsetted). You still need to pass the
> window->offset here to be able to compute the addresses correctly.
>
> Lets say you have two instances of your IP. Second bridge will have IO mapped at
> cpu_address_B, but the logical port addresses (i.e. res->start) will be non-zero
> (lets say they will be offsetted by 0x1000 that has been allocated to the first
> bridge). After the parsing of ranges for an IO range like 0x0 .. 0x1000 -> cpu_address_B
> the results will be:
>
> res->start = 0x1000
> res->end = 0x1fff
> window->offset = 0x1000;
> io_base = cpu_address_B;
>
> so pcibios_resource_to_bus() for this resource will return the correct region:
>
> region->start = 0;
> region->end = 0x0fff;
>
> but your math will give:
>
> cpu_addr = cpu_address_B;
> pci_addr = 0x1000;
>
> so the outbound setup won't be able to translate correctly.
>

Thanks for the catch. I was always testing IO region for e1000 on
port-0, so always though IO regions are working. I will correct it in
v8.

> Best regards,
> Liviu
>
>> + min_size = 128;
>> + flag |= OB_LO_IO;
>> + }
>> + if (size >= min_size)
>> + mask = ~(size - 1) | flag;
>> + else
>> + dev_warn(port->dev, "res size 0x%llx less than minimum 0x%x\n",
>> + (u64)size, min_size);
>> + writel(lower_32_bits(cpu_addr), base);
>> + writel(upper_32_bits(cpu_addr), base + 0x04);
>> + writel(lower_32_bits(mask), base + 0x08);
>> + writel(upper_32_bits(mask), base + 0x0c);
>> + writel(lower_32_bits(pci_addr), base + 0x10);
>> + writel(upper_32_bits(pci_addr), base + 0x14);
>> +}
>> +
>> +static void xgene_pcie_setup_cfg_reg(void __iomem *csr_base, u64 addr)
>> +{
>> + writel(lower_32_bits(addr), csr_base + CFGBARL);
>> + writel(upper_32_bits(addr), csr_base + CFGBARH);
>> + writel(EN_REG, csr_base + CFGCTL);
>> +}
>> +
>> +static int xgene_pcie_map_ranges(struct xgene_pcie_port *port,
>> + struct list_head *res,
>> + resource_size_t io_base)
>> +{
>> + struct pci_host_bridge_window *window;
>> + struct device *dev = port->dev;
>> + int ret;
>> +
>> + list_for_each_entry(window, res, list) {
>> + struct resource *res = window->res;
>> + u64 restype = resource_type(res);
>> +
>> + dev_dbg(port->dev, "0x%08lx 0x%016llx...0x%016llx\n",
>> + res->flags, res->start, res->end);
>> +
>> + switch (restype) {
>> + case IORESOURCE_IO:
>> + xgene_pcie_setup_ob_reg(port, res, OMR3BARL, io_base);
>> + ret = pci_remap_iospace(res, io_base);
>> + if (ret < 0)
>> + return ret;
>> + break;
>> + case IORESOURCE_MEM:
>> + xgene_pcie_setup_ob_reg(port, res, OMR1BARL,
>> + res->start - window->offset);
>> + break;
>> + case IORESOURCE_BUS:
>> + break;
>> + default:
>> + dev_err(dev, "invalid io resource!");
>> + return -EINVAL;
>> + }
>> + }
>> + xgene_pcie_setup_cfg_reg(port->csr_base, port->cfg_addr);
>> +
>> + return 0;
>> +}
>> +
>> +static void xgene_pcie_setup_pims(void *addr, u64 pim, u64 size)
>> +{
>> + writel(lower_32_bits(pim), addr);
>> + writel(upper_32_bits(pim) | EN_COHERENCY, addr + 0x04);
>> + writel(lower_32_bits(size), addr + 0x10);
>> + writel(upper_32_bits(size), addr + 0x14);
>> +}
>> +
>> +/*
>> + * X-Gene PCIe support maximum 3 inbound memory regions
>> + * This function helps to select a region based on size of region
>> + */
>> +static int xgene_pcie_select_ib_reg(u8 *ib_reg_mask, u64 size)
>> +{
>> + if ((size > 4) && (size < SZ_16M) && !(*ib_reg_mask & (1 << 1))) {
>> + *ib_reg_mask |= (1 << 1);
>> + return 1;
>> + }
>> +
>> + if ((size > SZ_1K) && (size < SZ_1T) && !(*ib_reg_mask & (1 << 0))) {
>> + *ib_reg_mask |= (1 << 0);
>> + return 0;
>> + }
>> +
>> + if ((size > SZ_1M) && (size < SZ_1T) && !(*ib_reg_mask & (1 << 2))) {
>> + *ib_reg_mask |= (1 << 2);
>> + return 2;
>> + }
>> +
>> + return -EINVAL;
>> +}
>> +
>> +static void xgene_pcie_setup_ib_reg(struct xgene_pcie_port *port,
>> + struct of_pci_range *range, u8 *ib_reg_mask)
>> +{
>> + void __iomem *csr_base = port->csr_base;
>> + void __iomem *cfg_base = port->cfg_base;
>> + void *bar_addr;
>> + void *pim_addr;
>> + u64 cpu_addr = range->cpu_addr;
>> + u64 pci_addr = range->pci_addr;
>> + u64 size = range->size;
>> + u64 mask = ~(size - 1) | EN_REG;
>> + u32 flags = PCI_BASE_ADDRESS_MEM_TYPE_64;
>> + u32 bar_low;
>> + int region;
>> +
>> + region = xgene_pcie_select_ib_reg(ib_reg_mask, range->size);
>> + if (region < 0) {
>> + dev_warn(port->dev, "invalid pcie dma-range config\n");
>> + return;
>> + }
>> +
>> + if (range->flags & IORESOURCE_PREFETCH)
>> + flags |= PCI_BASE_ADDRESS_MEM_PREFETCH;
>> +
>> + bar_low = pcie_bar_low_val((u32)cpu_addr, flags);
>> + switch (region) {
>> + case 0:
>> + xgene_pcie_set_ib_mask(csr_base, BRIDGE_CFG_4, flags, size);
>> + bar_addr = cfg_base + PCI_BASE_ADDRESS_0;
>> + writel(bar_low, bar_addr);
>> + writel(upper_32_bits(cpu_addr), bar_addr + 0x4);
>> + pim_addr = csr_base + PIM1_1L;
>> + break;
>> + case 1:
>> + bar_addr = csr_base + IBAR2;
>> + writel(bar_low, bar_addr);
>> + writel(lower_32_bits(mask), csr_base + IR2MSK);
>> + pim_addr = csr_base + PIM2_1L;
>> + break;
>> + case 2:
>> + bar_addr = csr_base + IBAR3L;
>> + writel(bar_low, bar_addr);
>> + writel(upper_32_bits(cpu_addr), bar_addr + 0x4);
>> + writel(lower_32_bits(mask), csr_base + IR3MSKL);
>> + writel(upper_32_bits(mask), csr_base + IR3MSKL + 0x4);
>> + pim_addr = csr_base + PIM3_1L;
>> + break;
>> + }
>> +
>> + xgene_pcie_setup_pims(pim_addr, pci_addr, ~(size - 1));
>> +}
>> +
>> +static int pci_dma_range_parser_init(struct of_pci_range_parser *parser,
>> + struct device_node *node)
>> +{
>> + const int na = 3, ns = 2;
>> + int rlen;
>> +
>> + parser->node = node;
>> + parser->pna = of_n_addr_cells(node);
>> + parser->np = parser->pna + na + ns;
>> +
>> + parser->range = of_get_property(node, "dma-ranges", &rlen);
>> + if (!parser->range)
>> + return -ENOENT;
>> + parser->end = parser->range + rlen / sizeof(__be32);
>> +
>> + return 0;
>> +}
>> +
>> +static int xgene_pcie_parse_map_dma_ranges(struct xgene_pcie_port *port)
>> +{
>> + struct device_node *np = port->node;
>> + struct of_pci_range range;
>> + struct of_pci_range_parser parser;
>> + struct device *dev = port->dev;
>> + u8 ib_reg_mask = 0;
>> +
>> + if (pci_dma_range_parser_init(&parser, np)) {
>> + dev_err(dev, "missing dma-ranges property\n");
>> + return -EINVAL;
>> + }
>> +
>> + /* Get the dma-ranges from DT */
>> + for_each_of_pci_range(&parser, &range) {
>> + u64 end = range.cpu_addr + range.size - 1;
>> +
>> + dev_dbg(port->dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n",
>> + range.flags, range.cpu_addr, end, range.pci_addr);
>> + xgene_pcie_setup_ib_reg(port, &range, &ib_reg_mask);
>> + }
>> + return 0;
>> +}
>> +
>> +/* clear bar configuration which was done by firmware */
>> +static void xgene_pcie_clear_config(struct xgene_pcie_port *port)
>> +{
>> + int i;
>> +
>> + for (i = PIM1_1L; i <= CFGCTL; i += 4)
>> + writel(0x0, port->csr_base + i);
>> +}
>> +
>> +static int xgene_pcie_setup(struct xgene_pcie_port *port,
>> + struct list_head *res,
>> + resource_size_t io_base)
>> +{
>> + u32 lanes = 0, speed = 0;
>> + int ret;
>> +
>> + xgene_pcie_clear_config(port);
>> +
>> + ret = xgene_pcie_map_ranges(port, res, io_base);
>> + if (ret)
>> + return ret;
>> +
>> + ret = xgene_pcie_parse_map_dma_ranges(port);
>> + if (ret)
>> + return ret;
>> +
>> + xgene_pcie_linkup(port, &lanes, &speed);
>> + if (!port->link_up)
>> + dev_info(port->dev, "(rc) link down\n");
>> + else
>> + dev_info(port->dev, "(rc) x%d gen-%d link up\n",
>> + lanes, speed + 1);
>> + return 0;
>> +}
>> +
>> +static int xgene_pcie_probe_bridge(struct platform_device *pdev)
>> +{
>> + struct device_node *dn = pdev->dev.of_node;
>> + struct xgene_pcie_port *port;
>> + resource_size_t iobase = 0;
>> + struct pci_bus *bus;
>> + int ret;
>> + LIST_HEAD(res);
>> +
>> + port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
>> + if (!port)
>> + return -ENOMEM;
>> + port->node = of_node_get(pdev->dev.of_node);
>> + port->dev = &pdev->dev;
>> +
>> + ret = xgene_pcie_map_reg(port, pdev);
>> + if (ret)
>> + return ret;
>> +
>> + ret = xgene_pcie_init_port(port);
>> + if (ret)
>> + return ret;
>> +
>> + ret = of_pci_get_host_bridge_resources(dn, 0, 0xff, &res, &iobase);
>> + if (ret)
>> + return ret;
>> +
>> + ret = xgene_pcie_setup(port, &res, iobase);
>> + if (ret)
>> + return ret;
>> +
>> + bus = pci_scan_root_bus(&pdev->dev, 0, &xgene_pcie_ops, port, &res);
>> + if (!bus)
>> + return -ENOMEM;
>> +
>> + platform_set_drvdata(pdev, port);
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id xgene_pcie_match_table[] = {
>> + {.compatible = "apm,xgene-pcie",},
>> + {},
>> +};
>> +
>> +static struct platform_driver xgene_pcie_driver = {
>> + .driver = {
>> + .name = "xgene-pcie",
>> + .owner = THIS_MODULE,
>> + .of_match_table = of_match_ptr(xgene_pcie_match_table),
>> + },
>> + .probe = xgene_pcie_probe_bridge,
>> +};
>> +module_platform_driver(xgene_pcie_driver);
>> +
>> +MODULE_AUTHOR("Tanmay Inamdar <tinamdar@xxxxxxx>");
>> +MODULE_DESCRIPTION("APM X-Gene PCIe driver");
>> +MODULE_LICENSE("GPL v2");
>> --
>> 1.9.1
>>
>>
>
> --
> ====================
> | I would like to |
> | fix the world, |
> | but they're not |
> | giving me the |
> \ source code! /
> ---------------
> Â\_(ã)_/Â
>
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