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Commit | Line | Data |
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29175778 LG |
1 | /* |
2 | * esb2rom.c | |
3 | * | |
4 | * Normal mappings of flash chips in physical memory | |
5 | * through the Intel ESB2 Southbridge. | |
6 | * | |
7 | * This was derived from ichxrom.c in May 2006 by | |
8 | * Lew Glendenning <lglendenning@lnxi.com> | |
9 | * | |
10 | * Eric Biederman, of course, was a major help in this effort. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/types.h> | |
29175778 LG |
15 | #include <linux/kernel.h> |
16 | #include <linux/init.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
29175778 LG |
18 | #include <asm/io.h> |
19 | #include <linux/mtd/mtd.h> | |
20 | #include <linux/mtd/map.h> | |
21 | #include <linux/mtd/cfi.h> | |
22 | #include <linux/mtd/flashchip.h> | |
23 | #include <linux/pci.h> | |
24 | #include <linux/pci_ids.h> | |
25 | #include <linux/list.h> | |
26 | ||
27 | #define MOD_NAME KBUILD_BASENAME | |
28 | ||
29 | #define ADDRESS_NAME_LEN 18 | |
30 | ||
31 | #define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */ | |
32 | ||
dc164bbb | 33 | #define BIOS_CNTL 0xDC |
29175778 LG |
34 | #define BIOS_LOCK_ENABLE 0x02 |
35 | #define BIOS_WRITE_ENABLE 0x01 | |
36 | ||
37 | /* This became a 16-bit register, and EN2 has disappeared */ | |
38 | #define FWH_DEC_EN1 0xD8 | |
39 | #define FWH_F8_EN 0x8000 | |
40 | #define FWH_F0_EN 0x4000 | |
41 | #define FWH_E8_EN 0x2000 | |
42 | #define FWH_E0_EN 0x1000 | |
43 | #define FWH_D8_EN 0x0800 | |
44 | #define FWH_D0_EN 0x0400 | |
45 | #define FWH_C8_EN 0x0200 | |
46 | #define FWH_C0_EN 0x0100 | |
47 | #define FWH_LEGACY_F_EN 0x0080 | |
48 | #define FWH_LEGACY_E_EN 0x0040 | |
49 | /* reserved 0x0020 and 0x0010 */ | |
50 | #define FWH_70_EN 0x0008 | |
51 | #define FWH_60_EN 0x0004 | |
52 | #define FWH_50_EN 0x0002 | |
53 | #define FWH_40_EN 0x0001 | |
54 | ||
55 | /* these are 32-bit values */ | |
56 | #define FWH_SEL1 0xD0 | |
57 | #define FWH_SEL2 0xD4 | |
58 | ||
59 | #define FWH_8MiB (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \ | |
60 | FWH_D8_EN | FWH_D0_EN | FWH_C8_EN | FWH_C0_EN | \ | |
61 | FWH_70_EN | FWH_60_EN | FWH_50_EN | FWH_40_EN) | |
62 | ||
63 | #define FWH_7MiB (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \ | |
64 | FWH_D8_EN | FWH_D0_EN | FWH_C8_EN | FWH_C0_EN | \ | |
65 | FWH_70_EN | FWH_60_EN | FWH_50_EN) | |
66 | ||
67 | #define FWH_6MiB (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \ | |
68 | FWH_D8_EN | FWH_D0_EN | FWH_C8_EN | FWH_C0_EN | \ | |
69 | FWH_70_EN | FWH_60_EN) | |
70 | ||
71 | #define FWH_5MiB (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \ | |
72 | FWH_D8_EN | FWH_D0_EN | FWH_C8_EN | FWH_C0_EN | \ | |
73 | FWH_70_EN) | |
74 | ||
75 | #define FWH_4MiB (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \ | |
76 | FWH_D8_EN | FWH_D0_EN | FWH_C8_EN | FWH_C0_EN) | |
77 | ||
78 | #define FWH_3_5MiB (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \ | |
79 | FWH_D8_EN | FWH_D0_EN | FWH_C8_EN) | |
80 | ||
81 | #define FWH_3MiB (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \ | |
82 | FWH_D8_EN | FWH_D0_EN) | |
83 | ||
84 | #define FWH_2_5MiB (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \ | |
85 | FWH_D8_EN) | |
86 | ||
87 | #define FWH_2MiB (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN) | |
88 | ||
89 | #define FWH_1_5MiB (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN) | |
90 | ||
91 | #define FWH_1MiB (FWH_F8_EN | FWH_F0_EN) | |
92 | ||
93 | #define FWH_0_5MiB (FWH_F8_EN) | |
94 | ||
95 | ||
96 | struct esb2rom_window { | |
97 | void __iomem* virt; | |
98 | unsigned long phys; | |
99 | unsigned long size; | |
100 | struct list_head maps; | |
101 | struct resource rsrc; | |
102 | struct pci_dev *pdev; | |
103 | }; | |
104 | ||
105 | struct esb2rom_map_info { | |
106 | struct list_head list; | |
107 | struct map_info map; | |
108 | struct mtd_info *mtd; | |
109 | struct resource rsrc; | |
110 | char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN]; | |
111 | }; | |
112 | ||
113 | static struct esb2rom_window esb2rom_window = { | |
114 | .maps = LIST_HEAD_INIT(esb2rom_window.maps), | |
115 | }; | |
116 | ||
117 | static void esb2rom_cleanup(struct esb2rom_window *window) | |
118 | { | |
119 | struct esb2rom_map_info *map, *scratch; | |
120 | u8 byte; | |
121 | ||
122 | /* Disable writes through the rom window */ | |
123 | pci_read_config_byte(window->pdev, BIOS_CNTL, &byte); | |
124 | pci_write_config_byte(window->pdev, BIOS_CNTL, | |
125 | byte & ~BIOS_WRITE_ENABLE); | |
126 | ||
127 | /* Free all of the mtd devices */ | |
128 | list_for_each_entry_safe(map, scratch, &window->maps, list) { | |
129 | if (map->rsrc.parent) | |
130 | release_resource(&map->rsrc); | |
131 | del_mtd_device(map->mtd); | |
132 | map_destroy(map->mtd); | |
133 | list_del(&map->list); | |
134 | kfree(map); | |
135 | } | |
136 | if (window->rsrc.parent) | |
137 | release_resource(&window->rsrc); | |
138 | if (window->virt) { | |
139 | iounmap(window->virt); | |
140 | window->virt = NULL; | |
141 | window->phys = 0; | |
142 | window->size = 0; | |
29175778 | 143 | } |
c7438d02 | 144 | pci_dev_put(window->pdev); |
29175778 LG |
145 | } |
146 | ||
147 | static int __devinit esb2rom_init_one(struct pci_dev *pdev, | |
dc164bbb | 148 | const struct pci_device_id *ent) |
29175778 LG |
149 | { |
150 | static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL }; | |
151 | struct esb2rom_window *window = &esb2rom_window; | |
152 | struct esb2rom_map_info *map = NULL; | |
153 | unsigned long map_top; | |
154 | u8 byte; | |
155 | u16 word; | |
156 | ||
157 | /* For now I just handle the ecb2 and I assume there | |
158 | * are not a lot of resources up at the top of the address | |
159 | * space. It is possible to handle other devices in the | |
160 | * top 16MiB but it is very painful. Also since | |
161 | * you can only really attach a FWH to an ICHX there | |
162 | * a number of simplifications you can make. | |
163 | * | |
164 | * Also you can page firmware hubs if an 8MiB window isn't enough | |
165 | * but don't currently handle that case either. | |
166 | */ | |
c7438d02 | 167 | window->pdev = pci_dev_get(pdev); |
29175778 LG |
168 | |
169 | /* RLG: experiment 2. Force the window registers to the widest values */ | |
170 | ||
171 | /* | |
172 | pci_read_config_word(pdev, FWH_DEC_EN1, &word); | |
173 | printk(KERN_DEBUG "Original FWH_DEC_EN1 : %x\n", word); | |
174 | pci_write_config_byte(pdev, FWH_DEC_EN1, 0xff); | |
175 | pci_read_config_byte(pdev, FWH_DEC_EN1, &byte); | |
176 | printk(KERN_DEBUG "New FWH_DEC_EN1 : %x\n", byte); | |
177 | ||
178 | pci_read_config_byte(pdev, FWH_DEC_EN2, &byte); | |
179 | printk(KERN_DEBUG "Original FWH_DEC_EN2 : %x\n", byte); | |
180 | pci_write_config_byte(pdev, FWH_DEC_EN2, 0x0f); | |
181 | pci_read_config_byte(pdev, FWH_DEC_EN2, &byte); | |
182 | printk(KERN_DEBUG "New FWH_DEC_EN2 : %x\n", byte); | |
183 | */ | |
184 | ||
185 | /* Find a region continuous to the end of the ROM window */ | |
186 | window->phys = 0; | |
187 | pci_read_config_word(pdev, FWH_DEC_EN1, &word); | |
dc164bbb | 188 | printk(KERN_DEBUG "pci_read_config_word : %x\n", word); |
29175778 LG |
189 | |
190 | if ((word & FWH_8MiB) == FWH_8MiB) | |
191 | window->phys = 0xff400000; | |
192 | else if ((word & FWH_7MiB) == FWH_7MiB) | |
193 | window->phys = 0xff500000; | |
194 | else if ((word & FWH_6MiB) == FWH_6MiB) | |
195 | window->phys = 0xff600000; | |
196 | else if ((word & FWH_5MiB) == FWH_5MiB) | |
197 | window->phys = 0xFF700000; | |
198 | else if ((word & FWH_4MiB) == FWH_4MiB) | |
199 | window->phys = 0xffc00000; | |
200 | else if ((word & FWH_3_5MiB) == FWH_3_5MiB) | |
201 | window->phys = 0xffc80000; | |
202 | else if ((word & FWH_3MiB) == FWH_3MiB) | |
203 | window->phys = 0xffd00000; | |
204 | else if ((word & FWH_2_5MiB) == FWH_2_5MiB) | |
205 | window->phys = 0xffd80000; | |
206 | else if ((word & FWH_2MiB) == FWH_2MiB) | |
207 | window->phys = 0xffe00000; | |
208 | else if ((word & FWH_1_5MiB) == FWH_1_5MiB) | |
209 | window->phys = 0xffe80000; | |
210 | else if ((word & FWH_1MiB) == FWH_1MiB) | |
211 | window->phys = 0xfff00000; | |
212 | else if ((word & FWH_0_5MiB) == FWH_0_5MiB) | |
213 | window->phys = 0xfff80000; | |
214 | ||
dc164bbb CG |
215 | if (window->phys == 0) { |
216 | printk(KERN_ERR MOD_NAME ": Rom window is closed\n"); | |
217 | goto out; | |
218 | } | |
219 | ||
29175778 LG |
220 | /* reserved 0x0020 and 0x0010 */ |
221 | window->phys -= 0x400000UL; | |
222 | window->size = (0xffffffffUL - window->phys) + 1UL; | |
223 | ||
224 | /* Enable writes through the rom window */ | |
225 | pci_read_config_byte(pdev, BIOS_CNTL, &byte); | |
226 | if (!(byte & BIOS_WRITE_ENABLE) && (byte & (BIOS_LOCK_ENABLE))) { | |
227 | /* The BIOS will generate an error if I enable | |
228 | * this device, so don't even try. | |
229 | */ | |
230 | printk(KERN_ERR MOD_NAME ": firmware access control, I can't enable writes\n"); | |
231 | goto out; | |
232 | } | |
233 | pci_write_config_byte(pdev, BIOS_CNTL, byte | BIOS_WRITE_ENABLE); | |
234 | ||
235 | /* | |
236 | * Try to reserve the window mem region. If this fails then | |
237 | * it is likely due to the window being "reseved" by the BIOS. | |
238 | */ | |
239 | window->rsrc.name = MOD_NAME; | |
240 | window->rsrc.start = window->phys; | |
241 | window->rsrc.end = window->phys + window->size - 1; | |
242 | window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
243 | if (request_resource(&iomem_resource, &window->rsrc)) { | |
244 | window->rsrc.parent = NULL; | |
245 | printk(KERN_DEBUG MOD_NAME | |
246 | ": %s(): Unable to register resource" | |
247 | " 0x%.08llx-0x%.08llx - kernel bug?\n", | |
248 | __func__, | |
249 | (unsigned long long)window->rsrc.start, | |
250 | (unsigned long long)window->rsrc.end); | |
251 | } | |
252 | ||
253 | /* Map the firmware hub into my address space. */ | |
254 | window->virt = ioremap_nocache(window->phys, window->size); | |
255 | if (!window->virt) { | |
256 | printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n", | |
257 | window->phys, window->size); | |
258 | goto out; | |
259 | } | |
260 | ||
261 | /* Get the first address to look for an rom chip at */ | |
262 | map_top = window->phys; | |
263 | if ((window->phys & 0x3fffff) != 0) { | |
264 | /* if not aligned on 4MiB, look 4MiB lower in address space */ | |
265 | map_top = window->phys + 0x400000; | |
266 | } | |
267 | #if 1 | |
268 | /* The probe sequence run over the firmware hub lock | |
269 | * registers sets them to 0x7 (no access). | |
270 | * (Insane hardware design, but most copied Intel's.) | |
271 | * ==> Probe at most the last 4M of the address space. | |
272 | */ | |
273 | if (map_top < 0xffc00000) | |
274 | map_top = 0xffc00000; | |
275 | #endif | |
276 | /* Loop through and look for rom chips */ | |
277 | while ((map_top - 1) < 0xffffffffUL) { | |
278 | struct cfi_private *cfi; | |
279 | unsigned long offset; | |
280 | int i; | |
281 | ||
282 | if (!map) | |
283 | map = kmalloc(sizeof(*map), GFP_KERNEL); | |
284 | if (!map) { | |
285 | printk(KERN_ERR MOD_NAME ": kmalloc failed"); | |
286 | goto out; | |
287 | } | |
288 | memset(map, 0, sizeof(*map)); | |
289 | INIT_LIST_HEAD(&map->list); | |
290 | map->map.name = map->map_name; | |
291 | map->map.phys = map_top; | |
292 | offset = map_top - window->phys; | |
293 | map->map.virt = (void __iomem *) | |
294 | (((unsigned long)(window->virt)) + offset); | |
295 | map->map.size = 0xffffffffUL - map_top + 1UL; | |
296 | /* Set the name of the map to the address I am trying */ | |
5ad0fdc6 AM |
297 | sprintf(map->map_name, "%s @%08Lx", |
298 | MOD_NAME, (unsigned long long)map->map.phys); | |
29175778 LG |
299 | |
300 | /* Firmware hubs only use vpp when being programmed | |
301 | * in a factory setting. So in-place programming | |
302 | * needs to use a different method. | |
303 | */ | |
304 | for(map->map.bankwidth = 32; map->map.bankwidth; | |
305 | map->map.bankwidth >>= 1) { | |
306 | char **probe_type; | |
307 | /* Skip bankwidths that are not supported */ | |
308 | if (!map_bankwidth_supported(map->map.bankwidth)) | |
309 | continue; | |
310 | ||
311 | /* Setup the map methods */ | |
312 | simple_map_init(&map->map); | |
313 | ||
314 | /* Try all of the probe methods */ | |
315 | probe_type = rom_probe_types; | |
316 | for(; *probe_type; probe_type++) { | |
317 | map->mtd = do_map_probe(*probe_type, &map->map); | |
318 | if (map->mtd) | |
319 | goto found; | |
320 | } | |
321 | } | |
322 | map_top += ROM_PROBE_STEP_SIZE; | |
323 | continue; | |
324 | found: | |
325 | /* Trim the size if we are larger than the map */ | |
326 | if (map->mtd->size > map->map.size) { | |
327 | printk(KERN_WARNING MOD_NAME | |
69423d99 AH |
328 | " rom(%llu) larger than window(%lu). fixing...\n", |
329 | (unsigned long long)map->mtd->size, map->map.size); | |
29175778 LG |
330 | map->mtd->size = map->map.size; |
331 | } | |
332 | if (window->rsrc.parent) { | |
333 | /* | |
334 | * Registering the MTD device in iomem may not be possible | |
335 | * if there is a BIOS "reserved" and BUSY range. If this | |
336 | * fails then continue anyway. | |
337 | */ | |
338 | map->rsrc.name = map->map_name; | |
339 | map->rsrc.start = map->map.phys; | |
340 | map->rsrc.end = map->map.phys + map->mtd->size - 1; | |
341 | map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
342 | if (request_resource(&window->rsrc, &map->rsrc)) { | |
343 | printk(KERN_ERR MOD_NAME | |
344 | ": cannot reserve MTD resource\n"); | |
345 | map->rsrc.parent = NULL; | |
346 | } | |
347 | } | |
348 | ||
349 | /* Make the whole region visible in the map */ | |
350 | map->map.virt = window->virt; | |
351 | map->map.phys = window->phys; | |
352 | cfi = map->map.fldrv_priv; | |
353 | for(i = 0; i < cfi->numchips; i++) | |
354 | cfi->chips[i].start += offset; | |
355 | ||
356 | /* Now that the mtd devices is complete claim and export it */ | |
357 | map->mtd->owner = THIS_MODULE; | |
358 | if (add_mtd_device(map->mtd)) { | |
359 | map_destroy(map->mtd); | |
360 | map->mtd = NULL; | |
361 | goto out; | |
362 | } | |
363 | ||
364 | /* Calculate the new value of map_top */ | |
365 | map_top += map->mtd->size; | |
366 | ||
367 | /* File away the map structure */ | |
368 | list_add(&map->list, &window->maps); | |
369 | map = NULL; | |
370 | } | |
371 | ||
372 | out: | |
373 | /* Free any left over map structures */ | |
374 | kfree(map); | |
375 | ||
376 | /* See if I have any map structures */ | |
377 | if (list_empty(&window->maps)) { | |
378 | esb2rom_cleanup(window); | |
379 | return -ENODEV; | |
380 | } | |
381 | return 0; | |
382 | } | |
383 | ||
384 | static void __devexit esb2rom_remove_one (struct pci_dev *pdev) | |
385 | { | |
386 | struct esb2rom_window *window = &esb2rom_window; | |
387 | esb2rom_cleanup(window); | |
388 | } | |
389 | ||
390 | static struct pci_device_id esb2rom_pci_tbl[] __devinitdata = { | |
391 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0, | |
392 | PCI_ANY_ID, PCI_ANY_ID, }, | |
393 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0, | |
394 | PCI_ANY_ID, PCI_ANY_ID, }, | |
395 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0, | |
396 | PCI_ANY_ID, PCI_ANY_ID, }, | |
397 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, | |
398 | PCI_ANY_ID, PCI_ANY_ID, }, | |
399 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1, | |
400 | PCI_ANY_ID, PCI_ANY_ID, }, | |
401 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0, | |
402 | PCI_ANY_ID, PCI_ANY_ID, }, | |
403 | { 0, }, | |
404 | }; | |
405 | ||
406 | #if 0 | |
407 | MODULE_DEVICE_TABLE(pci, esb2rom_pci_tbl); | |
408 | ||
409 | static struct pci_driver esb2rom_driver = { | |
410 | .name = MOD_NAME, | |
411 | .id_table = esb2rom_pci_tbl, | |
412 | .probe = esb2rom_init_one, | |
413 | .remove = esb2rom_remove_one, | |
414 | }; | |
415 | #endif | |
416 | ||
417 | static int __init init_esb2rom(void) | |
418 | { | |
419 | struct pci_dev *pdev; | |
420 | struct pci_device_id *id; | |
421 | int retVal; | |
422 | ||
423 | pdev = NULL; | |
424 | for (id = esb2rom_pci_tbl; id->vendor; id++) { | |
425 | printk(KERN_DEBUG "device id = %x\n", id->device); | |
c7438d02 | 426 | pdev = pci_get_device(id->vendor, id->device, NULL); |
29175778 LG |
427 | if (pdev) { |
428 | printk(KERN_DEBUG "matched device = %x\n", id->device); | |
429 | break; | |
430 | } | |
431 | } | |
432 | if (pdev) { | |
433 | printk(KERN_DEBUG "matched device id %x\n", id->device); | |
434 | retVal = esb2rom_init_one(pdev, &esb2rom_pci_tbl[0]); | |
c7438d02 | 435 | pci_dev_put(pdev); |
29175778 LG |
436 | printk(KERN_DEBUG "retVal = %d\n", retVal); |
437 | return retVal; | |
438 | } | |
439 | return -ENXIO; | |
440 | #if 0 | |
441 | return pci_register_driver(&esb2rom_driver); | |
442 | #endif | |
443 | } | |
444 | ||
445 | static void __exit cleanup_esb2rom(void) | |
446 | { | |
447 | esb2rom_remove_one(esb2rom_window.pdev); | |
448 | } | |
449 | ||
450 | module_init(init_esb2rom); | |
451 | module_exit(cleanup_esb2rom); | |
452 | ||
453 | MODULE_LICENSE("GPL"); | |
454 | MODULE_AUTHOR("Lew Glendenning <lglendenning@lnxi.com>"); | |
455 | MODULE_DESCRIPTION("MTD map driver for BIOS chips on the ESB2 southbridge"); |