1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2004 Koninklijke Philips Electronics NV 4 * 5 * Conversion to platform driver and DT: 6 * Copyright 2014 Linaro Ltd. 7 * 8 * 14/04/2005 Initial version, colin.king@philips.com 9 */ 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 20 static void __iomem *versatile_pci_base; 21 static 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 0x030010ee 28 #define VP_PCI_CLASS_ID 0x0b400000 29 30 static u32 pci_slot_ignore; 31 32 static 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 else 40 pci_slot_ignore |= (1 << slot); 41 } 42 return 1; 43 } 44 __setup("pci_slot_ignore=", versatile_pci_slot_ignore); 45 46 47 static 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 58 static 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 64 static 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 itself 101 * before the main PCI probing is performed 102 */ 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 space 116 */ 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 SDRAM 130 */ 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 buggy 137 * in that they both assumed the same broken IRQ mapping. 138 * QEMU therefore attempts to auto-detect old broken kernels 139 * so that they still work on newer QEMU as they did on old 140 * QEMU. Since we now use the correct (ie matching-hardware) 141 * IRQ mapping we write a definitely different value to a 142 * PCI_INTERRUPT_LINE register to tell QEMU that we expect 143 * real hardware behaviour and it need not be backwards 144 * 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 } 154 155 static const struct of_device_id versatile_pci_of_match[] = { 156 { .compatible = "arm,versatile-pci", }, 157 { }, 158 }; 159 MODULE_DEVICE_TABLE(of, versatile_pci_of_match); 160 161 static 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 }; 169 module_platform_driver(versatile_pci_driver); 170 171 MODULE_DESCRIPTION("Versatile PCI driver"); 172