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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright 2004 Koninklijke Philips Electronics NV4 *5 * Conversion to platform driver and DT:6 * Copyright 2014 Linaro Ltd.7 *8 * 14/04/2005 Initial version, colin.king@philips.com9 */10#include <linux/kernel.h>11#include <linux/module.h>12#include <linux/of_address.h>13#include <linux/of_pci.h>14#include <linux/of_platform.h>15#include <linux/pci.h>16#include <linux/platform_device.h>17 18#include "../pci.h"19 20static void __iomem *versatile_pci_base;21static void __iomem *versatile_cfg_base[2];22 23#define PCI_IMAP(m) (versatile_pci_base + ((m) * 4))24#define PCI_SMAP(m) (versatile_pci_base + 0x14 + ((m) * 4))25#define PCI_SELFID (versatile_pci_base + 0xc)26 27#define VP_PCI_DEVICE_ID 0x030010ee28#define VP_PCI_CLASS_ID 0x0b40000029 30static u32 pci_slot_ignore;31 32static int __init versatile_pci_slot_ignore(char *str)33{34 int slot;35 36 while (get_option(&str, &slot)) {37 if ((slot < 0) || (slot > 31))38 pr_err("Illegal slot value: %d\n", slot);39 else40 pci_slot_ignore |= (1 << slot);41 }42 return 1;43}44__setup("pci_slot_ignore=", versatile_pci_slot_ignore);45 46 47static void __iomem *versatile_map_bus(struct pci_bus *bus,48 unsigned int devfn, int offset)49{50 unsigned int busnr = bus->number;51 52 if (pci_slot_ignore & (1 << PCI_SLOT(devfn)))53 return NULL;54 55 return versatile_cfg_base[1] + ((busnr << 16) | (devfn << 8) | offset);56}57 58static struct pci_ops pci_versatile_ops = {59 .map_bus = versatile_map_bus,60 .read = pci_generic_config_read32,61 .write = pci_generic_config_write,62};63 64static int versatile_pci_probe(struct platform_device *pdev)65{66 struct device *dev = &pdev->dev;67 struct resource *res;68 struct resource_entry *entry;69 int i, myslot = -1, mem = 1;70 u32 val;71 void __iomem *local_pci_cfg_base;72 struct pci_host_bridge *bridge;73 74 bridge = devm_pci_alloc_host_bridge(dev, 0);75 if (!bridge)76 return -ENOMEM;77 78 versatile_pci_base = devm_platform_ioremap_resource(pdev, 0);79 if (IS_ERR(versatile_pci_base))80 return PTR_ERR(versatile_pci_base);81 82 versatile_cfg_base[0] = devm_platform_ioremap_resource(pdev, 1);83 if (IS_ERR(versatile_cfg_base[0]))84 return PTR_ERR(versatile_cfg_base[0]);85 86 res = platform_get_resource(pdev, IORESOURCE_MEM, 2);87 versatile_cfg_base[1] = devm_pci_remap_cfg_resource(dev, res);88 if (IS_ERR(versatile_cfg_base[1]))89 return PTR_ERR(versatile_cfg_base[1]);90 91 resource_list_for_each_entry(entry, &bridge->windows) {92 if (resource_type(entry->res) == IORESOURCE_MEM) {93 writel(entry->res->start >> 28, PCI_IMAP(mem));94 writel(__pa(PAGE_OFFSET) >> 28, PCI_SMAP(mem));95 mem++;96 }97 }98 99 /*100 * We need to discover the PCI core first to configure itself101 * before the main PCI probing is performed102 */103 for (i = 0; i < 32; i++) {104 if ((readl(versatile_cfg_base[0] + (i << 11) + PCI_VENDOR_ID) == VP_PCI_DEVICE_ID) &&105 (readl(versatile_cfg_base[0] + (i << 11) + PCI_CLASS_REVISION) == VP_PCI_CLASS_ID)) {106 myslot = i;107 break;108 }109 }110 if (myslot == -1) {111 dev_err(dev, "Cannot find PCI core!\n");112 return -EIO;113 }114 /*115 * Do not to map Versatile FPGA PCI device into memory space116 */117 pci_slot_ignore |= (1 << myslot);118 119 dev_info(dev, "PCI core found (slot %d)\n", myslot);120 121 writel(myslot, PCI_SELFID);122 local_pci_cfg_base = versatile_cfg_base[1] + (myslot << 11);123 124 val = readl(local_pci_cfg_base + PCI_COMMAND);125 val |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;126 writel(val, local_pci_cfg_base + PCI_COMMAND);127 128 /*129 * Configure the PCI inbound memory windows to be 1:1 mapped to SDRAM130 */131 writel(__pa(PAGE_OFFSET), local_pci_cfg_base + PCI_BASE_ADDRESS_0);132 writel(__pa(PAGE_OFFSET), local_pci_cfg_base + PCI_BASE_ADDRESS_1);133 writel(__pa(PAGE_OFFSET), local_pci_cfg_base + PCI_BASE_ADDRESS_2);134 135 /*136 * For many years the kernel and QEMU were symbiotically buggy137 * in that they both assumed the same broken IRQ mapping.138 * QEMU therefore attempts to auto-detect old broken kernels139 * so that they still work on newer QEMU as they did on old140 * QEMU. Since we now use the correct (ie matching-hardware)141 * IRQ mapping we write a definitely different value to a142 * PCI_INTERRUPT_LINE register to tell QEMU that we expect143 * real hardware behaviour and it need not be backwards144 * compatible for us. This write is harmless on real hardware.145 */146 writel(0, versatile_cfg_base[0] + PCI_INTERRUPT_LINE);147 148 pci_add_flags(PCI_REASSIGN_ALL_BUS);149 150 bridge->ops = &pci_versatile_ops;151 152 return pci_host_probe(bridge);153}154 155static const struct of_device_id versatile_pci_of_match[] = {156 { .compatible = "arm,versatile-pci", },157 { },158};159MODULE_DEVICE_TABLE(of, versatile_pci_of_match);160 161static struct platform_driver versatile_pci_driver = {162 .driver = {163 .name = "versatile-pci",164 .of_match_table = versatile_pci_of_match,165 .suppress_bind_attrs = true,166 },167 .probe = versatile_pci_probe,168};169module_platform_driver(versatile_pci_driver);170 171MODULE_DESCRIPTION("Versatile PCI driver");172