blob: c32bc28920b35fe3927f960a528a52fd2f6fa5c6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * ichxrom.c
3 *
4 * Normal mappings of chips in physical memory
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 */
6
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/pci.h>
17#include <linux/pci_ids.h>
18#include <linux/list.h>
19
20#define xstr(s) str(s)
21#define str(s) #s
22#define MOD_NAME xstr(KBUILD_BASENAME)
23
24#define ADDRESS_NAME_LEN 18
25
26#define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */
27
28#define BIOS_CNTL 0x4e
29#define FWH_DEC_EN1 0xE3
30#define FWH_DEC_EN2 0xF0
31#define FWH_SEL1 0xE8
32#define FWH_SEL2 0xEE
33
34struct ichxrom_window {
35 void __iomem* virt;
36 unsigned long phys;
37 unsigned long size;
38 struct list_head maps;
39 struct resource rsrc;
40 struct pci_dev *pdev;
41};
42
43struct ichxrom_map_info {
44 struct list_head list;
45 struct map_info map;
46 struct mtd_info *mtd;
47 struct resource rsrc;
48 char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
49};
50
51static struct ichxrom_window ichxrom_window = {
52 .maps = LIST_HEAD_INIT(ichxrom_window.maps),
53};
54
55static void ichxrom_cleanup(struct ichxrom_window *window)
56{
57 struct ichxrom_map_info *map, *scratch;
58 u16 word;
59
60 /* Disable writes through the rom window */
61 pci_read_config_word(window->pdev, BIOS_CNTL, &word);
62 pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1);
Alan Coxdd8e9ed2006-09-22 10:19:20 +010063 pci_dev_put(window->pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65 /* Free all of the mtd devices */
66 list_for_each_entry_safe(map, scratch, &window->maps, list) {
67 if (map->rsrc.parent)
68 release_resource(&map->rsrc);
69 del_mtd_device(map->mtd);
70 map_destroy(map->mtd);
71 list_del(&map->list);
72 kfree(map);
73 }
74 if (window->rsrc.parent)
75 release_resource(&window->rsrc);
76 if (window->virt) {
77 iounmap(window->virt);
78 window->virt = NULL;
79 window->phys = 0;
80 window->size = 0;
81 window->pdev = NULL;
82 }
83}
84
85
86static int __devinit ichxrom_init_one (struct pci_dev *pdev,
87 const struct pci_device_id *ent)
88{
89 static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
90 struct ichxrom_window *window = &ichxrom_window;
91 struct ichxrom_map_info *map = NULL;
92 unsigned long map_top;
93 u8 byte;
94 u16 word;
95
96 /* For now I just handle the ichx and I assume there
97 * are not a lot of resources up at the top of the address
98 * space. It is possible to handle other devices in the
99 * top 16MB but it is very painful. Also since
100 * you can only really attach a FWH to an ICHX there
101 * a number of simplifications you can make.
102 *
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000103 * Also you can page firmware hubs if an 8MB window isn't enough
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 * but don't currently handle that case either.
105 */
106 window->pdev = pdev;
107
108 /* Find a region continuous to the end of the ROM window */
109 window->phys = 0;
110 pci_read_config_byte(pdev, FWH_DEC_EN1, &byte);
111 if (byte == 0xff) {
112 window->phys = 0xffc00000;
113 pci_read_config_byte(pdev, FWH_DEC_EN2, &byte);
114 if ((byte & 0x0f) == 0x0f) {
115 window->phys = 0xff400000;
116 }
117 else if ((byte & 0x0e) == 0x0e) {
118 window->phys = 0xff500000;
119 }
120 else if ((byte & 0x0c) == 0x0c) {
121 window->phys = 0xff600000;
122 }
123 else if ((byte & 0x08) == 0x08) {
124 window->phys = 0xff700000;
125 }
126 }
127 else if ((byte & 0xfe) == 0xfe) {
128 window->phys = 0xffc80000;
129 }
130 else if ((byte & 0xfc) == 0xfc) {
131 window->phys = 0xffd00000;
132 }
133 else if ((byte & 0xf8) == 0xf8) {
134 window->phys = 0xffd80000;
135 }
136 else if ((byte & 0xf0) == 0xf0) {
137 window->phys = 0xffe00000;
138 }
139 else if ((byte & 0xe0) == 0xe0) {
140 window->phys = 0xffe80000;
141 }
142 else if ((byte & 0xc0) == 0xc0) {
143 window->phys = 0xfff00000;
144 }
145 else if ((byte & 0x80) == 0x80) {
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000146 window->phys = 0xfff80000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 }
148
149 if (window->phys == 0) {
150 printk(KERN_ERR MOD_NAME ": Rom window is closed\n");
151 goto out;
152 }
153 window->phys -= 0x400000UL;
154 window->size = (0xffffffffUL - window->phys) + 1UL;
155
156 /* Enable writes through the rom window */
157 pci_read_config_word(pdev, BIOS_CNTL, &word);
158 if (!(word & 1) && (word & (1<<1))) {
159 /* The BIOS will generate an error if I enable
160 * this device, so don't even try.
161 */
162 printk(KERN_ERR MOD_NAME ": firmware access control, I can't enable writes\n");
163 goto out;
164 }
165 pci_write_config_word(pdev, BIOS_CNTL, word | 1);
166
167 /*
168 * Try to reserve the window mem region. If this fails then
169 * it is likely due to the window being "reseved" by the BIOS.
170 */
171 window->rsrc.name = MOD_NAME;
172 window->rsrc.start = window->phys;
173 window->rsrc.end = window->phys + window->size - 1;
174 window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
175 if (request_resource(&iomem_resource, &window->rsrc)) {
176 window->rsrc.parent = NULL;
177 printk(KERN_DEBUG MOD_NAME
178 ": %s(): Unable to register resource"
Greg Kroah-Hartman176dfc62006-06-12 15:15:17 -0700179 " 0x%.16llx-0x%.16llx - kernel bug?\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 __func__,
Greg Kroah-Hartman176dfc62006-06-12 15:15:17 -0700181 (unsigned long long)window->rsrc.start,
182 (unsigned long long)window->rsrc.end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 }
184
185 /* Map the firmware hub into my address space. */
186 window->virt = ioremap_nocache(window->phys, window->size);
187 if (!window->virt) {
188 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
189 window->phys, window->size);
190 goto out;
191 }
192
193 /* Get the first address to look for an rom chip at */
194 map_top = window->phys;
195 if ((window->phys & 0x3fffff) != 0) {
196 map_top = window->phys + 0x400000;
197 }
198#if 1
199 /* The probe sequence run over the firmware hub lock
200 * registers sets them to 0x7 (no access).
201 * Probe at most the last 4M of the address space.
202 */
203 if (map_top < 0xffc00000) {
204 map_top = 0xffc00000;
205 }
206#endif
207 /* Loop through and look for rom chips */
208 while((map_top - 1) < 0xffffffffUL) {
209 struct cfi_private *cfi;
210 unsigned long offset;
211 int i;
212
213 if (!map) {
214 map = kmalloc(sizeof(*map), GFP_KERNEL);
215 }
216 if (!map) {
217 printk(KERN_ERR MOD_NAME ": kmalloc failed");
218 goto out;
219 }
220 memset(map, 0, sizeof(*map));
221 INIT_LIST_HEAD(&map->list);
222 map->map.name = map->map_name;
223 map->map.phys = map_top;
224 offset = map_top - window->phys;
225 map->map.virt = (void __iomem *)
226 (((unsigned long)(window->virt)) + offset);
227 map->map.size = 0xffffffffUL - map_top + 1UL;
228 /* Set the name of the map to the address I am trying */
Andrew Morton3a38d3a2007-02-17 16:02:09 -0800229 sprintf(map->map_name, "%s @%08Lx",
230 MOD_NAME, (unsigned long long)map->map.phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 /* Firmware hubs only use vpp when being programmed
233 * in a factory setting. So in-place programming
234 * needs to use a different method.
235 */
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000236 for(map->map.bankwidth = 32; map->map.bankwidth;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 map->map.bankwidth >>= 1)
238 {
239 char **probe_type;
240 /* Skip bankwidths that are not supported */
241 if (!map_bankwidth_supported(map->map.bankwidth))
242 continue;
243
244 /* Setup the map methods */
245 simple_map_init(&map->map);
246
247 /* Try all of the probe methods */
248 probe_type = rom_probe_types;
249 for(; *probe_type; probe_type++) {
250 map->mtd = do_map_probe(*probe_type, &map->map);
251 if (map->mtd)
252 goto found;
253 }
254 }
255 map_top += ROM_PROBE_STEP_SIZE;
256 continue;
257 found:
258 /* Trim the size if we are larger than the map */
259 if (map->mtd->size > map->map.size) {
260 printk(KERN_WARNING MOD_NAME
Adrian Hunter69423d92008-12-10 13:37:21 +0000261 " rom(%llu) larger than window(%lu). fixing...\n",
262 (unsigned long long)map->mtd->size, map->map.size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 map->mtd->size = map->map.size;
264 }
265 if (window->rsrc.parent) {
266 /*
267 * Registering the MTD device in iomem may not be possible
268 * if there is a BIOS "reserved" and BUSY range. If this
269 * fails then continue anyway.
270 */
271 map->rsrc.name = map->map_name;
272 map->rsrc.start = map->map.phys;
273 map->rsrc.end = map->map.phys + map->mtd->size - 1;
274 map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
275 if (request_resource(&window->rsrc, &map->rsrc)) {
276 printk(KERN_ERR MOD_NAME
277 ": cannot reserve MTD resource\n");
278 map->rsrc.parent = NULL;
279 }
280 }
281
282 /* Make the whole region visible in the map */
283 map->map.virt = window->virt;
284 map->map.phys = window->phys;
285 cfi = map->map.fldrv_priv;
286 for(i = 0; i < cfi->numchips; i++) {
287 cfi->chips[i].start += offset;
288 }
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 /* Now that the mtd devices is complete claim and export it */
291 map->mtd->owner = THIS_MODULE;
292 if (add_mtd_device(map->mtd)) {
293 map_destroy(map->mtd);
294 map->mtd = NULL;
295 goto out;
296 }
297
298
299 /* Calculate the new value of map_top */
300 map_top += map->mtd->size;
301
302 /* File away the map structure */
303 list_add(&map->list, &window->maps);
304 map = NULL;
305 }
306
307 out:
308 /* Free any left over map structures */
Jesper Juhlfa671642005-11-07 01:01:27 -0800309 kfree(map);
310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 /* See if I have any map structures */
312 if (list_empty(&window->maps)) {
313 ichxrom_cleanup(window);
314 return -ENODEV;
315 }
316 return 0;
317}
318
319
320static void __devexit ichxrom_remove_one (struct pci_dev *pdev)
321{
322 struct ichxrom_window *window = &ichxrom_window;
323 ichxrom_cleanup(window);
324}
325
326static struct pci_device_id ichxrom_pci_tbl[] __devinitdata = {
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000327 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 PCI_ANY_ID, PCI_ANY_ID, },
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000329 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 PCI_ANY_ID, PCI_ANY_ID, },
Thomas Gleixner69f34c92005-11-07 11:15:40 +0000331 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 PCI_ANY_ID, PCI_ANY_ID, },
333 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
334 PCI_ANY_ID, PCI_ANY_ID, },
335 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1,
336 PCI_ANY_ID, PCI_ANY_ID, },
337 { 0, },
338};
339
David Woodhouseb9c86d52005-07-07 11:26:24 +0100340#if 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341MODULE_DEVICE_TABLE(pci, ichxrom_pci_tbl);
342
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343static struct pci_driver ichxrom_driver = {
344 .name = MOD_NAME,
345 .id_table = ichxrom_pci_tbl,
346 .probe = ichxrom_init_one,
347 .remove = ichxrom_remove_one,
348};
349#endif
350
351static int __init init_ichxrom(void)
352{
353 struct pci_dev *pdev;
354 struct pci_device_id *id;
355
356 pdev = NULL;
357 for (id = ichxrom_pci_tbl; id->vendor; id++) {
Alan Coxdd8e9ed2006-09-22 10:19:20 +0100358 pdev = pci_get_device(id->vendor, id->device, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 if (pdev) {
360 break;
361 }
362 }
363 if (pdev) {
364 return ichxrom_init_one(pdev, &ichxrom_pci_tbl[0]);
365 }
366 return -ENXIO;
367#if 0
Domen Puncerff3bc4e2005-03-18 14:04:38 +0000368 return pci_register_driver(&ichxrom_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369#endif
370}
371
372static void __exit cleanup_ichxrom(void)
373{
374 ichxrom_remove_one(ichxrom_window.pdev);
375}
376
377module_init(init_ichxrom);
378module_exit(cleanup_ichxrom);
379
380MODULE_LICENSE("GPL");
381MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
382MODULE_DESCRIPTION("MTD map driver for BIOS chips on the ICHX southbridge");