Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * mmconfig.c - Low-level direct PCI config space access via MMCONFIG | |
15a58ed1 | 3 | * |
1da177e4 LT |
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> | |
54549391 | 10 | #include <linux/acpi.h> |
d6ece549 | 11 | #include <linux/bitmap.h> |
946f2ee5 AV |
12 | #include <asm/e820.h> |
13 | ||
1da177e4 LT |
14 | #include "pci.h" |
15 | ||
1da177e4 | 16 | /* Static virtual mapping of the MMCONFIG aperture */ |
1cde8a16 | 17 | struct mmcfg_virt { |
15a58ed1 | 18 | struct acpi_mcfg_allocation *cfg; |
8b8a4e33 | 19 | char __iomem *virt; |
1cde8a16 GKH |
20 | }; |
21 | static struct mmcfg_virt *pci_mmcfg_virt; | |
1da177e4 | 22 | |
8b8a4e33 | 23 | static char __iomem *get_virt(unsigned int seg, unsigned bus) |
1da177e4 | 24 | { |
15a58ed1 | 25 | struct acpi_mcfg_allocation *cfg; |
429d512e | 26 | int cfg_num; |
1cde8a16 | 27 | |
429d512e | 28 | for (cfg_num = 0; cfg_num < pci_mmcfg_config_num; cfg_num++) { |
1cde8a16 | 29 | cfg = pci_mmcfg_virt[cfg_num].cfg; |
429d512e OH |
30 | if (cfg->pci_segment == seg && |
31 | (cfg->start_bus_number <= bus) && | |
1cde8a16 GKH |
32 | (cfg->end_bus_number >= bus)) |
33 | return pci_mmcfg_virt[cfg_num].virt; | |
34 | } | |
3103039c | 35 | |
3103039c | 36 | /* Fall back to type 0 */ |
cc59853b | 37 | return NULL; |
1cde8a16 GKH |
38 | } |
39 | ||
8b8a4e33 | 40 | static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn) |
1cde8a16 | 41 | { |
8b8a4e33 | 42 | char __iomem *addr; |
a0ca9909 | 43 | |
d6ece549 | 44 | addr = get_virt(seg, bus); |
928cf8c6 AK |
45 | if (!addr) |
46 | return NULL; | |
47 | return addr + ((bus << 20) | (devfn << 12)); | |
1da177e4 LT |
48 | } |
49 | ||
50 | static int pci_mmcfg_read(unsigned int seg, unsigned int bus, | |
51 | unsigned int devfn, int reg, int len, u32 *value) | |
52 | { | |
8b8a4e33 | 53 | char __iomem *addr; |
1da177e4 | 54 | |
928cf8c6 | 55 | /* Why do we have this when nobody checks it. How about a BUG()!? -AK */ |
ecc16ba9 | 56 | if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) { |
a0ca9909 | 57 | err: *value = -1; |
1da177e4 | 58 | return -EINVAL; |
49c93e84 | 59 | } |
1da177e4 | 60 | |
a0ca9909 IK |
61 | if (reg < 256) |
62 | return pci_conf1_read(seg,bus,devfn,reg,len,value); | |
63 | ||
928cf8c6 AK |
64 | addr = pci_dev_base(seg, bus, devfn); |
65 | if (!addr) | |
a0ca9909 | 66 | goto err; |
928cf8c6 | 67 | |
1da177e4 LT |
68 | switch (len) { |
69 | case 1: | |
3320ad99 | 70 | *value = mmio_config_readb(addr + reg); |
1da177e4 LT |
71 | break; |
72 | case 2: | |
3320ad99 | 73 | *value = mmio_config_readw(addr + reg); |
1da177e4 LT |
74 | break; |
75 | case 4: | |
3320ad99 | 76 | *value = mmio_config_readl(addr + reg); |
1da177e4 LT |
77 | break; |
78 | } | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static int pci_mmcfg_write(unsigned int seg, unsigned int bus, | |
84 | unsigned int devfn, int reg, int len, u32 value) | |
85 | { | |
8b8a4e33 | 86 | char __iomem *addr; |
1da177e4 | 87 | |
928cf8c6 | 88 | /* Why do we have this when nobody checks it. How about a BUG()!? -AK */ |
1da177e4 LT |
89 | if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) |
90 | return -EINVAL; | |
91 | ||
a0ca9909 IK |
92 | if (reg < 256) |
93 | return pci_conf1_write(seg,bus,devfn,reg,len,value); | |
94 | ||
928cf8c6 AK |
95 | addr = pci_dev_base(seg, bus, devfn); |
96 | if (!addr) | |
a0ca9909 | 97 | return -EINVAL; |
928cf8c6 | 98 | |
1da177e4 LT |
99 | switch (len) { |
100 | case 1: | |
3320ad99 | 101 | mmio_config_writeb(addr + reg, value); |
1da177e4 LT |
102 | break; |
103 | case 2: | |
3320ad99 | 104 | mmio_config_writew(addr + reg, value); |
1da177e4 LT |
105 | break; |
106 | case 4: | |
3320ad99 | 107 | mmio_config_writel(addr + reg, value); |
1da177e4 LT |
108 | break; |
109 | } | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | static struct pci_raw_ops pci_mmcfg = { | |
115 | .read = pci_mmcfg_read, | |
116 | .write = pci_mmcfg_write, | |
117 | }; | |
118 | ||
44de0203 OH |
119 | static void __iomem * __init mcfg_ioremap(struct acpi_mcfg_allocation *cfg) |
120 | { | |
121 | void __iomem *addr; | |
122 | u32 size; | |
123 | ||
124 | size = (cfg->end_bus_number + 1) << 20; | |
125 | addr = ioremap_nocache(cfg->address, size); | |
126 | if (addr) { | |
127 | printk(KERN_INFO "PCI: Using MMCONFIG at %Lx - %Lx\n", | |
128 | cfg->address, cfg->address + size - 1); | |
129 | } | |
130 | return addr; | |
131 | } | |
132 | ||
b7867394 | 133 | int __init pci_mmcfg_arch_init(void) |
1da177e4 | 134 | { |
1cde8a16 | 135 | int i; |
b7867394 OG |
136 | pci_mmcfg_virt = kmalloc(sizeof(*pci_mmcfg_virt) * |
137 | pci_mmcfg_config_num, GFP_KERNEL); | |
1cde8a16 | 138 | if (pci_mmcfg_virt == NULL) { |
3095fc0c | 139 | printk(KERN_ERR "PCI: Can not allocate memory for mmconfig structures\n"); |
b7867394 | 140 | return 0; |
1cde8a16 | 141 | } |
b7867394 | 142 | |
1cde8a16 GKH |
143 | for (i = 0; i < pci_mmcfg_config_num; ++i) { |
144 | pci_mmcfg_virt[i].cfg = &pci_mmcfg_config[i]; | |
faed197b | 145 | pci_mmcfg_virt[i].virt = mcfg_ioremap(&pci_mmcfg_config[i]); |
1cde8a16 | 146 | if (!pci_mmcfg_virt[i].virt) { |
3095fc0c DJ |
147 | printk(KERN_ERR "PCI: Cannot map mmconfig aperture for " |
148 | "segment %d\n", | |
15a58ed1 | 149 | pci_mmcfg_config[i].pci_segment); |
b7867394 | 150 | return 0; |
1cde8a16 | 151 | } |
1cde8a16 | 152 | } |
1da177e4 | 153 | raw_pci_ops = &pci_mmcfg; |
b7867394 | 154 | return 1; |
1da177e4 | 155 | } |