Re: [PATCH v8 1/4] pci:host: APM X-Gene PCIe host controller driver

From: Liviu Dudau
Date: Tue Sep 16 2014 - 17:17:31 EST

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On Tue, Sep 16, 2014 at 09:02:11PM +0100, Tanmay Inamdar wrote:
> On Fri, Sep 12, 2014 at 2:18 AM, Liviu Dudau <Liviu.Dudau@xxxxxxx> wrote:
> > On Thu, Sep 11, 2014 at 11:57:43PM +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,
> >
> > It looks good to me now. You can add if you care:
> >
> > Reviewed-by: Liviu Dudau <Liviu.Dudau@xxxxxxx>
> >
>
> Thanks Liviu.
>
> I will have to send another version of patch as I forgot to add
> 'dma-coherent' in device tree entry.
>
> Secondly I see that setting 'dma-coherent' in device tree node sets
> coherent_dma_ops for the root bus but for the endpoint another 'dev'
> gets assigned. This causes endpoint to use non-coherent dma apis
> causing failure in dma operations.
>
> Somehow endpoint drivers should be able to detect that

Does that mean that you need something added to pcibios_add_device()
to do the dma_ops setting?

Best regards,
Liviu

> > Best regards,
> > Liviu
> >
> >> ---
> >> drivers/pci/host/Kconfig | 10 +
> >> drivers/pci/host/Makefile | 1 +
> >> drivers/pci/host/pci-xgene.c | 646 +++++++++++++++++++++++++++++++++++++++++++
> >> 3 files changed, 657 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..dae61a6
> >> --- /dev/null
> >> +++ b/drivers/pci/host/pci-xgene.c
> >> @@ -0,0 +1,646 @@
> >> +/**
> >> + * 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 cpu_addr, u64 pci_addr)
> >> +{
> >> + void __iomem *base = port->csr_base + offset;
> >> + resource_size_t size = resource_size(res);
> >> + u64 restype = resource_type(res);
> >> + u64 mask = 0;
> >> + u32 min_size;
> >> + u32 flag = EN_REG;
> >> +
> >> + if (restype == IORESOURCE_MEM) {
> >> + min_size = SZ_128M;
> >> + } else {
> >> + 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,
> >> + res->start - window->offset);
> >> + 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,
> >> + 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
> >
>

--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
Â\_(ã)_/Â

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