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 retval; 35 int slot; 36 37 while ((retval = get_option(&str, &slot))) { 38 if ((slot < 0) || (slot > 31)) 39 pr_err("Illegal slot value: %d\n", slot); 40 else 41 pci_slot_ignore |= (1 << slot); 42 } 43 return 1; 44 } 45 __setup("pci_slot_ignore=", versatile_pci_slot_ignore); 46 47 48 static void __iomem *versatile_map_bus(struct pci_bus *bus, 49 unsigned int devfn, int offset) 50 { 51 unsigned int busnr = bus->number; 52 53 if (pci_slot_ignore & (1 << PCI_SLOT(devfn))) 54 return NULL; 55 56 return versatile_cfg_base[1] + ((busnr << 16) | (devfn << 8) | offset); 57 } 58 59 static struct pci_ops pci_versatile_ops = { 60 .map_bus = versatile_map_bus, 61 .read = pci_generic_config_read32, 62 .write = pci_generic_config_write, 63 }; 64 65 static int versatile_pci_probe(struct platform_device *pdev) 66 { 67 struct device *dev = &pdev->dev; 68 struct resource *res; 69 struct resource_entry *entry; 70 int i, myslot = -1, mem = 1; 71 u32 val; 72 void __iomem *local_pci_cfg_base; 73 struct pci_host_bridge *bridge; 74 75 bridge = devm_pci_alloc_host_bridge(dev, 0); 76 if (!bridge) 77 return -ENOMEM; 78 79 versatile_pci_base = devm_platform_ioremap_resource(pdev, 0); 80 if (IS_ERR(versatile_pci_base)) 81 return PTR_ERR(versatile_pci_base); 82 83 versatile_cfg_base[0] = devm_platform_ioremap_resource(pdev, 1); 84 if (IS_ERR(versatile_cfg_base[0])) 85 return PTR_ERR(versatile_cfg_base[0]); 86 87 res = platform_get_resource(pdev, IORESOURCE_MEM, 2); 88 versatile_cfg_base[1] = devm_pci_remap_cfg_resource(dev, res); 89 if (IS_ERR(versatile_cfg_base[1])) 90 return PTR_ERR(versatile_cfg_base[1]); 91 92 resource_list_for_each_entry(entry, &bridge->windows) { 93 if (resource_type(entry->res) == IORESOURCE_MEM) { 94 writel(entry->res->start >> 28, PCI_IMAP(mem)); 95 writel(__pa(PAGE_OFFSET) >> 28, PCI_SMAP(mem)); 96 mem++; 97 } 98 } 99 100 /* 101 * We need to discover the PCI core first to configure itself 102 * before the main PCI probing is performed 103 */ 104 for (i = 0; i < 32; i++) { 105 if ((readl(versatile_cfg_base[0] + (i << 11) + PCI_VENDOR_ID) == VP_PCI_DEVICE_ID) && 106 (readl(versatile_cfg_base[0] + (i << 11) + PCI_CLASS_REVISION) == VP_PCI_CLASS_ID)) { 107 myslot = i; 108 break; 109 } 110 } 111 if (myslot == -1) { 112 dev_err(dev, "Cannot find PCI core!\n"); 113 return -EIO; 114 } 115 /* 116 * Do not to map Versatile FPGA PCI device into memory space 117 */ 118 pci_slot_ignore |= (1 << myslot); 119 120 dev_info(dev, "PCI core found (slot %d)\n", myslot); 121 122 writel(myslot, PCI_SELFID); 123 local_pci_cfg_base = versatile_cfg_base[1] + (myslot << 11); 124 125 val = readl(local_pci_cfg_base + PCI_COMMAND); 126 val |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE; 127 writel(val, local_pci_cfg_base + PCI_COMMAND); 128 129 /* 130 * Configure the PCI inbound memory windows to be 1:1 mapped to SDRAM 131 */ 132 writel(__pa(PAGE_OFFSET), local_pci_cfg_base + PCI_BASE_ADDRESS_0); 133 writel(__pa(PAGE_OFFSET), local_pci_cfg_base + PCI_BASE_ADDRESS_1); 134 writel(__pa(PAGE_OFFSET), local_pci_cfg_base + PCI_BASE_ADDRESS_2); 135 136 /* 137 * For many years the kernel and QEMU were symbiotically buggy 138 * in that they both assumed the same broken IRQ mapping. 139 * QEMU therefore attempts to auto-detect old broken kernels 140 * so that they still work on newer QEMU as they did on old 141 * QEMU. Since we now use the correct (ie matching-hardware) 142 * IRQ mapping we write a definitely different value to a 143 * PCI_INTERRUPT_LINE register to tell QEMU that we expect 144 * real hardware behaviour and it need not be backwards 145 * compatible for us. This write is harmless on real hardware. 146 */ 147 writel(0, versatile_cfg_base[0] + PCI_INTERRUPT_LINE); 148 149 pci_add_flags(PCI_REASSIGN_ALL_BUS); 150 151 bridge->ops = &pci_versatile_ops; 152 153 return pci_host_probe(bridge); 154 } 155 156 static const struct of_device_id versatile_pci_of_match[] = { 157 { .compatible = "arm,versatile-pci", }, 158 { }, 159 }; 160 MODULE_DEVICE_TABLE(of, versatile_pci_of_match); 161 162 static struct platform_driver versatile_pci_driver = { 163 .driver = { 164 .name = "versatile-pci", 165 .of_match_table = versatile_pci_of_match, 166 .suppress_bind_attrs = true, 167 }, 168 .probe = versatile_pci_probe, 169 }; 170 module_platform_driver(versatile_pci_driver); 171 172 MODULE_DESCRIPTION("Versatile PCI driver"); 173 MODULE_LICENSE("GPL v2"); 174