]>
Commit | Line | Data |
---|---|---|
a32073bf AK |
1 | /* |
2 | * Shared support code for AMD K8 northbridges and derivates. | |
3 | * Copyright 2006 Andi Kleen, SUSE Labs. Subject to GPLv2. | |
4 | */ | |
a32073bf | 5 | #include <linux/types.h> |
5a0e3ad6 | 6 | #include <linux/slab.h> |
a32073bf AK |
7 | #include <linux/init.h> |
8 | #include <linux/errno.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/spinlock.h> | |
23ac4ae8 | 11 | #include <asm/amd_nb.h> |
a32073bf | 12 | |
a32073bf AK |
13 | static u32 *flush_words; |
14 | ||
9653a5c7 | 15 | struct pci_device_id amd_nb_misc_ids[] = { |
cf169702 JR |
16 | { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) }, |
17 | { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) }, | |
5c80cc78 | 18 | { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_MISC) }, |
a32073bf AK |
19 | {} |
20 | }; | |
9653a5c7 | 21 | EXPORT_SYMBOL(amd_nb_misc_ids); |
a32073bf | 22 | |
24d9b70b JB |
23 | const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = { |
24 | { 0x00, 0x18, 0x20 }, | |
25 | { 0xff, 0x00, 0x20 }, | |
26 | { 0xfe, 0x00, 0x20 }, | |
27 | { } | |
28 | }; | |
29 | ||
eec1d4fa HR |
30 | struct amd_northbridge_info amd_northbridges; |
31 | EXPORT_SYMBOL(amd_northbridges); | |
a32073bf | 32 | |
9653a5c7 HR |
33 | static struct pci_dev *next_northbridge(struct pci_dev *dev, |
34 | struct pci_device_id *ids) | |
a32073bf AK |
35 | { |
36 | do { | |
37 | dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); | |
38 | if (!dev) | |
39 | break; | |
9653a5c7 | 40 | } while (!pci_match_id(ids, dev)); |
a32073bf AK |
41 | return dev; |
42 | } | |
43 | ||
9653a5c7 | 44 | int amd_cache_northbridges(void) |
a32073bf | 45 | { |
9653a5c7 HR |
46 | int i = 0; |
47 | struct amd_northbridge *nb; | |
48 | struct pci_dev *misc; | |
3c6df2a9 | 49 | |
9653a5c7 | 50 | if (amd_nb_num()) |
a32073bf AK |
51 | return 0; |
52 | ||
9653a5c7 HR |
53 | misc = NULL; |
54 | while ((misc = next_northbridge(misc, amd_nb_misc_ids)) != NULL) | |
55 | i++; | |
900f9ac9 | 56 | |
9653a5c7 HR |
57 | if (i == 0) |
58 | return 0; | |
a32073bf | 59 | |
9653a5c7 HR |
60 | nb = kzalloc(i * sizeof(struct amd_northbridge), GFP_KERNEL); |
61 | if (!nb) | |
a32073bf AK |
62 | return -ENOMEM; |
63 | ||
9653a5c7 HR |
64 | amd_northbridges.nb = nb; |
65 | amd_northbridges.num = i; | |
3c6df2a9 | 66 | |
9653a5c7 HR |
67 | misc = NULL; |
68 | for (i = 0; i != amd_nb_num(); i++) { | |
69 | node_to_amd_nb(i)->misc = misc = | |
70 | next_northbridge(misc, amd_nb_misc_ids); | |
71 | } | |
72 | ||
73 | /* some CPU families (e.g. family 0x11) do not support GART */ | |
74 | if (boot_cpu_data.x86 == 0xf || boot_cpu_data.x86 == 0x10 || | |
75 | boot_cpu_data.x86 == 0x15) | |
76 | amd_northbridges.flags |= AMD_NB_GART; | |
a32073bf | 77 | |
f658bcfb HR |
78 | /* |
79 | * Some CPU families support L3 Cache Index Disable. There are some | |
80 | * limitations because of E382 and E388 on family 0x10. | |
81 | */ | |
82 | if (boot_cpu_data.x86 == 0x10 && | |
83 | boot_cpu_data.x86_model >= 0x8 && | |
84 | (boot_cpu_data.x86_model > 0x9 || | |
85 | boot_cpu_data.x86_mask >= 0x1)) | |
86 | amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE; | |
87 | ||
a32073bf AK |
88 | return 0; |
89 | } | |
9653a5c7 | 90 | EXPORT_SYMBOL_GPL(amd_cache_northbridges); |
a32073bf AK |
91 | |
92 | /* Ignores subdevice/subvendor but as far as I can figure out | |
93 | they're useless anyways */ | |
eec1d4fa | 94 | int __init early_is_amd_nb(u32 device) |
a32073bf AK |
95 | { |
96 | struct pci_device_id *id; | |
97 | u32 vendor = device & 0xffff; | |
98 | device >>= 16; | |
9653a5c7 | 99 | for (id = amd_nb_misc_ids; id->vendor; id++) |
a32073bf AK |
100 | if (vendor == id->vendor && device == id->device) |
101 | return 1; | |
102 | return 0; | |
103 | } | |
104 | ||
9653a5c7 HR |
105 | int amd_cache_gart(void) |
106 | { | |
107 | int i; | |
108 | ||
109 | if (!amd_nb_has_feature(AMD_NB_GART)) | |
110 | return 0; | |
111 | ||
112 | flush_words = kmalloc(amd_nb_num() * sizeof(u32), GFP_KERNEL); | |
113 | if (!flush_words) { | |
114 | amd_northbridges.flags &= ~AMD_NB_GART; | |
115 | return -ENOMEM; | |
116 | } | |
117 | ||
118 | for (i = 0; i != amd_nb_num(); i++) | |
119 | pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c, | |
120 | &flush_words[i]); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
eec1d4fa | 125 | void amd_flush_garts(void) |
a32073bf AK |
126 | { |
127 | int flushed, i; | |
128 | unsigned long flags; | |
129 | static DEFINE_SPINLOCK(gart_lock); | |
130 | ||
9653a5c7 | 131 | if (!amd_nb_has_feature(AMD_NB_GART)) |
900f9ac9 AH |
132 | return; |
133 | ||
a32073bf AK |
134 | /* Avoid races between AGP and IOMMU. In theory it's not needed |
135 | but I'm not sure if the hardware won't lose flush requests | |
136 | when another is pending. This whole thing is so expensive anyways | |
137 | that it doesn't matter to serialize more. -AK */ | |
138 | spin_lock_irqsave(&gart_lock, flags); | |
139 | flushed = 0; | |
9653a5c7 HR |
140 | for (i = 0; i < amd_nb_num(); i++) { |
141 | pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c, | |
142 | flush_words[i] | 1); | |
a32073bf AK |
143 | flushed++; |
144 | } | |
9653a5c7 | 145 | for (i = 0; i < amd_nb_num(); i++) { |
a32073bf AK |
146 | u32 w; |
147 | /* Make sure the hardware actually executed the flush*/ | |
148 | for (;;) { | |
9653a5c7 | 149 | pci_read_config_dword(node_to_amd_nb(i)->misc, |
a32073bf AK |
150 | 0x9c, &w); |
151 | if (!(w & 1)) | |
152 | break; | |
153 | cpu_relax(); | |
154 | } | |
155 | } | |
156 | spin_unlock_irqrestore(&gart_lock, flags); | |
157 | if (!flushed) | |
158 | printk("nothing to flush?\n"); | |
159 | } | |
eec1d4fa | 160 | EXPORT_SYMBOL_GPL(amd_flush_garts); |
a32073bf | 161 | |
eec1d4fa | 162 | static __init int init_amd_nbs(void) |
0e152cd7 BP |
163 | { |
164 | int err = 0; | |
165 | ||
9653a5c7 | 166 | err = amd_cache_northbridges(); |
0e152cd7 BP |
167 | |
168 | if (err < 0) | |
eec1d4fa | 169 | printk(KERN_NOTICE "AMD NB: Cannot enumerate AMD northbridges.\n"); |
0e152cd7 | 170 | |
9653a5c7 HR |
171 | if (amd_cache_gart() < 0) |
172 | printk(KERN_NOTICE "AMD NB: Cannot initialize GART flush words, " | |
173 | "GART support disabled.\n"); | |
174 | ||
0e152cd7 BP |
175 | return err; |
176 | } | |
177 | ||
178 | /* This has to go after the PCI subsystem */ | |
eec1d4fa | 179 | fs_initcall(init_amd_nbs); |