Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * mmconfig.c - Low-level direct PCI config space access via MMCONFIG |
Alexey Starikovskiy | 15a58ed | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * This is an 64bit optimized version that always keeps the full mmconfig |
| 5 | * space mapped. This allows lockless config space operation. |
| 6 | */ |
| 7 | |
| 8 | #include <linux/pci.h> |
| 9 | #include <linux/init.h> |
Greg Kroah-Hartman | 5454939 | 2005-06-23 17:35:56 -0700 | [diff] [blame] | 10 | #include <linux/acpi.h> |
Andi Kleen | d6ece54 | 2005-12-12 22:17:11 -0800 | [diff] [blame] | 11 | #include <linux/bitmap.h> |
Arjan van de Ven | 946f2ee | 2006-04-07 19:49:30 +0200 | [diff] [blame] | 12 | #include <asm/e820.h> |
Jaswinder Singh Rajput | 8248771 | 2008-12-27 18:32:28 +0530 | [diff] [blame] | 13 | #include <asm/pci_x86.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | |
Al Viro | 8b8a4e3 | 2005-12-15 09:17:44 +0000 | [diff] [blame] | 15 | static char __iomem *get_virt(unsigned int seg, unsigned bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | { |
Bjorn Helgaas | d215a9c | 2009-11-13 17:34:13 -0700 | [diff] [blame] | 17 | struct pci_mmcfg_region *cfg; |
Greg Kroah-Hartman | 1cde8a1 | 2005-06-23 17:35:56 -0700 | [diff] [blame] | 18 | |
Bjorn Helgaas | ff097dd | 2009-11-13 17:34:49 -0700 | [diff] [blame] | 19 | list_for_each_entry(cfg, &pci_mmcfg_list, list) |
Bjorn Helgaas | d7e6b66 | 2009-11-13 17:34:18 -0700 | [diff] [blame] | 20 | if (cfg->segment == seg && |
| 21 | (cfg->start_bus <= bus) && |
| 22 | (cfg->end_bus >= bus)) |
Bjorn Helgaas | 3f0f550 | 2009-11-13 17:34:39 -0700 | [diff] [blame] | 23 | return cfg->virt; |
Andi Kleen | 3103039 | 2006-01-27 02:03:50 +0100 | [diff] [blame] | 24 | |
Andi Kleen | 3103039 | 2006-01-27 02:03:50 +0100 | [diff] [blame] | 25 | /* Fall back to type 0 */ |
Al Viro | cc59853 | 2006-02-03 20:28:01 -0500 | [diff] [blame] | 26 | return NULL; |
Greg Kroah-Hartman | 1cde8a1 | 2005-06-23 17:35:56 -0700 | [diff] [blame] | 27 | } |
| 28 | |
Al Viro | 8b8a4e3 | 2005-12-15 09:17:44 +0000 | [diff] [blame] | 29 | static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn) |
Greg Kroah-Hartman | 1cde8a1 | 2005-06-23 17:35:56 -0700 | [diff] [blame] | 30 | { |
Al Viro | 8b8a4e3 | 2005-12-15 09:17:44 +0000 | [diff] [blame] | 31 | char __iomem *addr; |
Ivan Kokshaysky | a0ca990 | 2008-01-14 17:31:09 -0500 | [diff] [blame] | 32 | |
Andi Kleen | d6ece54 | 2005-12-12 22:17:11 -0800 | [diff] [blame] | 33 | addr = get_virt(seg, bus); |
Andi Kleen | 928cf8c | 2005-12-12 22:17:10 -0800 | [diff] [blame] | 34 | if (!addr) |
| 35 | return NULL; |
Bjorn Helgaas | df5eb1d | 2009-11-13 17:34:08 -0700 | [diff] [blame] | 36 | return addr + (PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | } |
| 38 | |
| 39 | static int pci_mmcfg_read(unsigned int seg, unsigned int bus, |
| 40 | unsigned int devfn, int reg, int len, u32 *value) |
| 41 | { |
Al Viro | 8b8a4e3 | 2005-12-15 09:17:44 +0000 | [diff] [blame] | 42 | char __iomem *addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Andi Kleen | 928cf8c | 2005-12-12 22:17:10 -0800 | [diff] [blame] | 44 | /* Why do we have this when nobody checks it. How about a BUG()!? -AK */ |
Andi Kleen | ecc16ba | 2006-04-11 12:54:48 +0200 | [diff] [blame] | 45 | if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) { |
Ivan Kokshaysky | a0ca990 | 2008-01-14 17:31:09 -0500 | [diff] [blame] | 46 | err: *value = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | return -EINVAL; |
Andi Kleen | 49c93e8 | 2006-04-07 19:50:15 +0200 | [diff] [blame] | 48 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Andi Kleen | 928cf8c | 2005-12-12 22:17:10 -0800 | [diff] [blame] | 50 | addr = pci_dev_base(seg, bus, devfn); |
| 51 | if (!addr) |
Ivan Kokshaysky | a0ca990 | 2008-01-14 17:31:09 -0500 | [diff] [blame] | 52 | goto err; |
Andi Kleen | 928cf8c | 2005-12-12 22:17:10 -0800 | [diff] [blame] | 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | switch (len) { |
| 55 | case 1: |
dean gaudet | 3320ad9 | 2007-08-10 22:30:59 +0200 | [diff] [blame] | 56 | *value = mmio_config_readb(addr + reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | break; |
| 58 | case 2: |
dean gaudet | 3320ad9 | 2007-08-10 22:30:59 +0200 | [diff] [blame] | 59 | *value = mmio_config_readw(addr + reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | break; |
| 61 | case 4: |
dean gaudet | 3320ad9 | 2007-08-10 22:30:59 +0200 | [diff] [blame] | 62 | *value = mmio_config_readl(addr + reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | break; |
| 64 | } |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | static int pci_mmcfg_write(unsigned int seg, unsigned int bus, |
| 70 | unsigned int devfn, int reg, int len, u32 value) |
| 71 | { |
Al Viro | 8b8a4e3 | 2005-12-15 09:17:44 +0000 | [diff] [blame] | 72 | char __iomem *addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Andi Kleen | 928cf8c | 2005-12-12 22:17:10 -0800 | [diff] [blame] | 74 | /* Why do we have this when nobody checks it. How about a BUG()!? -AK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) |
| 76 | return -EINVAL; |
| 77 | |
Andi Kleen | 928cf8c | 2005-12-12 22:17:10 -0800 | [diff] [blame] | 78 | addr = pci_dev_base(seg, bus, devfn); |
| 79 | if (!addr) |
Ivan Kokshaysky | a0ca990 | 2008-01-14 17:31:09 -0500 | [diff] [blame] | 80 | return -EINVAL; |
Andi Kleen | 928cf8c | 2005-12-12 22:17:10 -0800 | [diff] [blame] | 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | switch (len) { |
| 83 | case 1: |
dean gaudet | 3320ad9 | 2007-08-10 22:30:59 +0200 | [diff] [blame] | 84 | mmio_config_writeb(addr + reg, value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | break; |
| 86 | case 2: |
dean gaudet | 3320ad9 | 2007-08-10 22:30:59 +0200 | [diff] [blame] | 87 | mmio_config_writew(addr + reg, value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | break; |
| 89 | case 4: |
dean gaudet | 3320ad9 | 2007-08-10 22:30:59 +0200 | [diff] [blame] | 90 | mmio_config_writel(addr + reg, value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | break; |
| 92 | } |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static struct pci_raw_ops pci_mmcfg = { |
| 98 | .read = pci_mmcfg_read, |
| 99 | .write = pci_mmcfg_write, |
| 100 | }; |
| 101 | |
Bjorn Helgaas | d215a9c | 2009-11-13 17:34:13 -0700 | [diff] [blame] | 102 | static void __iomem * __init mcfg_ioremap(struct pci_mmcfg_region *cfg) |
OGAWA Hirofumi | 44de020 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 103 | { |
| 104 | void __iomem *addr; |
Yinghai Lu | 068258b | 2009-03-19 20:55:35 -0700 | [diff] [blame] | 105 | u64 start, size; |
Bjorn Helgaas | df5eb1d | 2009-11-13 17:34:08 -0700 | [diff] [blame] | 106 | int num_buses; |
OGAWA Hirofumi | 44de020 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 107 | |
Bjorn Helgaas | d7e6b66 | 2009-11-13 17:34:18 -0700 | [diff] [blame] | 108 | start = cfg->address + PCI_MMCFG_BUS_OFFSET(cfg->start_bus); |
| 109 | num_buses = cfg->end_bus - cfg->start_bus + 1; |
Bjorn Helgaas | df5eb1d | 2009-11-13 17:34:08 -0700 | [diff] [blame] | 110 | size = PCI_MMCFG_BUS_OFFSET(num_buses); |
Yinghai Lu | 068258b | 2009-03-19 20:55:35 -0700 | [diff] [blame] | 111 | addr = ioremap_nocache(start, size); |
OGAWA Hirofumi | 44de020 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 112 | if (addr) { |
| 113 | printk(KERN_INFO "PCI: Using MMCONFIG at %Lx - %Lx\n", |
Yinghai Lu | 068258b | 2009-03-19 20:55:35 -0700 | [diff] [blame] | 114 | start, start + size - 1); |
Bjorn Helgaas | d7e6b66 | 2009-11-13 17:34:18 -0700 | [diff] [blame] | 115 | addr -= PCI_MMCFG_BUS_OFFSET(cfg->start_bus); |
OGAWA Hirofumi | 44de020 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 116 | } |
| 117 | return addr; |
| 118 | } |
| 119 | |
Olivier Galibert | b786739 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 120 | int __init pci_mmcfg_arch_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
Bjorn Helgaas | 3f0f550 | 2009-11-13 17:34:39 -0700 | [diff] [blame] | 122 | struct pci_mmcfg_region *cfg; |
Olivier Galibert | b786739 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 123 | |
Bjorn Helgaas | ff097dd | 2009-11-13 17:34:49 -0700 | [diff] [blame] | 124 | list_for_each_entry(cfg, &pci_mmcfg_list, list) { |
Bjorn Helgaas | 3f0f550 | 2009-11-13 17:34:39 -0700 | [diff] [blame] | 125 | cfg->virt = mcfg_ioremap(cfg); |
| 126 | if (!cfg->virt) { |
Dave Jones | 3095fc0 | 2006-10-20 14:45:33 -0700 | [diff] [blame] | 127 | printk(KERN_ERR "PCI: Cannot map mmconfig aperture for " |
| 128 | "segment %d\n", |
Bjorn Helgaas | 3f0f550 | 2009-11-13 17:34:39 -0700 | [diff] [blame] | 129 | cfg->segment); |
Yinghai Lu | 0b64ad7 | 2008-02-15 01:28:41 -0800 | [diff] [blame] | 130 | pci_mmcfg_arch_free(); |
Olivier Galibert | b786739 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 131 | return 0; |
Greg Kroah-Hartman | 1cde8a1 | 2005-06-23 17:35:56 -0700 | [diff] [blame] | 132 | } |
Greg Kroah-Hartman | 1cde8a1 | 2005-06-23 17:35:56 -0700 | [diff] [blame] | 133 | } |
Matthew Wilcox | b6ce068 | 2008-02-10 09:45:28 -0500 | [diff] [blame] | 134 | raw_pci_ext_ops = &pci_mmcfg; |
Olivier Galibert | b786739 | 2007-02-13 13:26:20 +0100 | [diff] [blame] | 135 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
Yinghai Lu | 0b64ad7 | 2008-02-15 01:28:41 -0800 | [diff] [blame] | 137 | |
| 138 | void __init pci_mmcfg_arch_free(void) |
| 139 | { |
Bjorn Helgaas | 3f0f550 | 2009-11-13 17:34:39 -0700 | [diff] [blame] | 140 | struct pci_mmcfg_region *cfg; |
Yinghai Lu | 0b64ad7 | 2008-02-15 01:28:41 -0800 | [diff] [blame] | 141 | |
Bjorn Helgaas | ff097dd | 2009-11-13 17:34:49 -0700 | [diff] [blame] | 142 | list_for_each_entry(cfg, &pci_mmcfg_list, list) { |
Bjorn Helgaas | 3f0f550 | 2009-11-13 17:34:39 -0700 | [diff] [blame] | 143 | if (cfg->virt) { |
| 144 | iounmap(cfg->virt + PCI_MMCFG_BUS_OFFSET(cfg->start_bus)); |
| 145 | cfg->virt = NULL; |
Yinghai Lu | 0b64ad7 | 2008-02-15 01:28:41 -0800 | [diff] [blame] | 146 | } |
| 147 | } |
Yinghai Lu | 0b64ad7 | 2008-02-15 01:28:41 -0800 | [diff] [blame] | 148 | } |