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7#include <linux/module.h>
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <asm/io.h>
12#include <linux/mtd/mtd.h>
13#include <linux/mtd/map.h>
14#include <linux/mtd/cfi.h>
15#include <linux/mtd/flashchip.h>
16#include <linux/pci.h>
17#include <linux/pci_ids.h>
18#include <linux/list.h>
19
20
21#define xstr(s) str(s)
22#define str(s) #s
23#define MOD_NAME xstr(KBUILD_BASENAME)
24
25#define ADDRESS_NAME_LEN 18
26
27#define ROM_PROBE_STEP_SIZE (64*1024)
28
29struct amd76xrom_window {
30 void __iomem *virt;
31 unsigned long phys;
32 unsigned long size;
33 struct list_head maps;
34 struct resource rsrc;
35 struct pci_dev *pdev;
36};
37
38struct amd76xrom_map_info {
39 struct list_head list;
40 struct map_info map;
41 struct mtd_info *mtd;
42 struct resource rsrc;
43 char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
44};
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59static uint win_size_bits;
60module_param(win_size_bits, uint, 0);
61MODULE_PARM_DESC(win_size_bits, "ROM window size bits override for 0x43 byte, normally set by BIOS.");
62
63static struct amd76xrom_window amd76xrom_window = {
64 .maps = LIST_HEAD_INIT(amd76xrom_window.maps),
65};
66
67static void amd76xrom_cleanup(struct amd76xrom_window *window)
68{
69 struct amd76xrom_map_info *map, *scratch;
70 u8 byte;
71
72 if (window->pdev) {
73
74 pci_read_config_byte(window->pdev, 0x40, &byte);
75 pci_write_config_byte(window->pdev, 0x40, byte & ~1);
76 pci_dev_put(window->pdev);
77 }
78
79
80 list_for_each_entry_safe(map, scratch, &window->maps, list) {
81 if (map->rsrc.parent) {
82 release_resource(&map->rsrc);
83 }
84 del_mtd_device(map->mtd);
85 map_destroy(map->mtd);
86 list_del(&map->list);
87 kfree(map);
88 }
89 if (window->rsrc.parent)
90 release_resource(&window->rsrc);
91
92 if (window->virt) {
93 iounmap(window->virt);
94 window->virt = NULL;
95 window->phys = 0;
96 window->size = 0;
97 window->pdev = NULL;
98 }
99}
100
101
102static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
103 const struct pci_device_id *ent)
104{
105 static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
106 u8 byte;
107 struct amd76xrom_window *window = &amd76xrom_window;
108 struct amd76xrom_map_info *map = NULL;
109 unsigned long map_top;
110
111
112 window->pdev = pdev;
113
114
115
116
117
118
119
120
121 pci_read_config_byte(pdev, 0x43, &byte);
122 pci_write_config_byte(pdev, 0x43, byte | win_size_bits );
123
124
125 pci_read_config_byte(pdev, 0x43, &byte);
126 if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) {
127 window->phys = 0xffb00000;
128 }
129 else if ((byte & (1<<7)) == (1<<7)) {
130 window->phys = 0xffc00000;
131 }
132 else {
133 window->phys = 0xffff0000;
134 }
135 window->size = 0xffffffffUL - window->phys + 1UL;
136
137
138
139
140
141
142
143
144 window->rsrc.name = MOD_NAME;
145 window->rsrc.start = window->phys;
146 window->rsrc.end = window->phys + window->size - 1;
147 window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
148 if (request_resource(&iomem_resource, &window->rsrc)) {
149 window->rsrc.parent = NULL;
150 printk(KERN_ERR MOD_NAME
151 " %s(): Unable to register resource"
152 " 0x%.16llx-0x%.16llx - kernel bug?\n",
153 __func__,
154 (unsigned long long)window->rsrc.start,
155 (unsigned long long)window->rsrc.end);
156 }
157
158
159
160 pci_read_config_byte(pdev, 0x40, &byte);
161 pci_write_config_byte(pdev, 0x40, byte | 1);
162
163
164
165
166 window->virt = ioremap_nocache(window->phys, window->size);
167 if (!window->virt) {
168 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
169 window->phys, window->size);
170 goto out;
171 }
172
173
174 map_top = window->phys;
175#if 1
176
177
178
179
180 if (map_top < 0xffc00000) {
181 map_top = 0xffc00000;
182 }
183#endif
184
185 while((map_top - 1) < 0xffffffffUL) {
186 struct cfi_private *cfi;
187 unsigned long offset;
188 int i;
189
190 if (!map) {
191 map = kmalloc(sizeof(*map), GFP_KERNEL);
192 }
193 if (!map) {
194 printk(KERN_ERR MOD_NAME ": kmalloc failed");
195 goto out;
196 }
197 memset(map, 0, sizeof(*map));
198 INIT_LIST_HEAD(&map->list);
199 map->map.name = map->map_name;
200 map->map.phys = map_top;
201 offset = map_top - window->phys;
202 map->map.virt = (void __iomem *)
203 (((unsigned long)(window->virt)) + offset);
204 map->map.size = 0xffffffffUL - map_top + 1UL;
205
206 sprintf(map->map_name, "%s @%08Lx",
207 MOD_NAME, (unsigned long long)map->map.phys);
208
209
210 for(map->map.bankwidth = 32; map->map.bankwidth;
211 map->map.bankwidth >>= 1)
212 {
213 char **probe_type;
214
215 if (!map_bankwidth_supported(map->map.bankwidth))
216 continue;
217
218
219 simple_map_init(&map->map);
220
221
222 probe_type = rom_probe_types;
223 for(; *probe_type; probe_type++) {
224 map->mtd = do_map_probe(*probe_type, &map->map);
225 if (map->mtd)
226 goto found;
227 }
228 }
229 map_top += ROM_PROBE_STEP_SIZE;
230 continue;
231 found:
232
233 if (map->mtd->size > map->map.size) {
234 printk(KERN_WARNING MOD_NAME
235 " rom(%u) larger than window(%lu). fixing...\n",
236 map->mtd->size, map->map.size);
237 map->mtd->size = map->map.size;
238 }
239 if (window->rsrc.parent) {
240
241
242
243
244
245 map->rsrc.name = map->map_name;
246 map->rsrc.start = map->map.phys;
247 map->rsrc.end = map->map.phys + map->mtd->size - 1;
248 map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
249 if (request_resource(&window->rsrc, &map->rsrc)) {
250 printk(KERN_ERR MOD_NAME
251 ": cannot reserve MTD resource\n");
252 map->rsrc.parent = NULL;
253 }
254 }
255
256
257 map->map.virt = window->virt;
258 map->map.phys = window->phys;
259 cfi = map->map.fldrv_priv;
260 for(i = 0; i < cfi->numchips; i++) {
261 cfi->chips[i].start += offset;
262 }
263
264
265 map->mtd->owner = THIS_MODULE;
266 if (add_mtd_device(map->mtd)) {
267 map_destroy(map->mtd);
268 map->mtd = NULL;
269 goto out;
270 }
271
272
273
274 map_top += map->mtd->size;
275
276
277 list_add(&map->list, &window->maps);
278 map = NULL;
279 }
280
281 out:
282
283 kfree(map);
284
285 if (list_empty(&window->maps)) {
286 amd76xrom_cleanup(window);
287 return -ENODEV;
288 }
289 return 0;
290}
291
292
293static void __devexit amd76xrom_remove_one (struct pci_dev *pdev)
294{
295 struct amd76xrom_window *window = &amd76xrom_window;
296
297 amd76xrom_cleanup(window);
298}
299
300static struct pci_device_id amd76xrom_pci_tbl[] = {
301 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410,
302 PCI_ANY_ID, PCI_ANY_ID, },
303 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440,
304 PCI_ANY_ID, PCI_ANY_ID, },
305 { PCI_VENDOR_ID_AMD, 0x7468 },
306 { 0, }
307};
308
309MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl);
310
311
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314
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316
317
318
319
320static int __init init_amd76xrom(void)
321{
322 struct pci_dev *pdev;
323 struct pci_device_id *id;
324 pdev = NULL;
325 for(id = amd76xrom_pci_tbl; id->vendor; id++) {
326 pdev = pci_get_device(id->vendor, id->device, NULL);
327 if (pdev) {
328 break;
329 }
330 }
331 if (pdev) {
332 return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]);
333 }
334 return -ENXIO;
335
336
337
338}
339
340static void __exit cleanup_amd76xrom(void)
341{
342 amd76xrom_remove_one(amd76xrom_window.pdev);
343}
344
345module_init(init_amd76xrom);
346module_exit(cleanup_amd76xrom);
347
348MODULE_LICENSE("GPL");
349MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
350MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge");
351