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-rw-r--r--drivers/mtd/maps/ichxrom.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/drivers/mtd/maps/ichxrom.c b/drivers/mtd/maps/ichxrom.c
new file mode 100644
index 000000000000..29d1cc1bb426
--- /dev/null
+++ b/drivers/mtd/maps/ichxrom.c
@@ -0,0 +1,383 @@
1/*
2 * ichxrom.c
3 *
4 * Normal mappings of chips in physical memory
5 * $Id: ichxrom.c,v 1.16 2004/11/28 09:40:39 dwmw2 Exp $
6 */
7
8#include <linux/module.h>
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <asm/io.h>
13#include <linux/mtd/mtd.h>
14#include <linux/mtd/map.h>
15#include <linux/mtd/cfi.h>
16#include <linux/mtd/flashchip.h>
17#include <linux/config.h>
18#include <linux/pci.h>
19#include <linux/pci_ids.h>
20#include <linux/list.h>
21
22#define xstr(s) str(s)
23#define str(s) #s
24#define MOD_NAME xstr(KBUILD_BASENAME)
25
26#define ADDRESS_NAME_LEN 18
27
28#define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */
29
30#define BIOS_CNTL 0x4e
31#define FWH_DEC_EN1 0xE3
32#define FWH_DEC_EN2 0xF0
33#define FWH_SEL1 0xE8
34#define FWH_SEL2 0xEE
35
36struct ichxrom_window {
37 void __iomem* virt;
38 unsigned long phys;
39 unsigned long size;
40 struct list_head maps;
41 struct resource rsrc;
42 struct pci_dev *pdev;
43};
44
45struct ichxrom_map_info {
46 struct list_head list;
47 struct map_info map;
48 struct mtd_info *mtd;
49 struct resource rsrc;
50 char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
51};
52
53static struct ichxrom_window ichxrom_window = {
54 .maps = LIST_HEAD_INIT(ichxrom_window.maps),
55};
56
57static void ichxrom_cleanup(struct ichxrom_window *window)
58{
59 struct ichxrom_map_info *map, *scratch;
60 u16 word;
61
62 /* Disable writes through the rom window */
63 pci_read_config_word(window->pdev, BIOS_CNTL, &word);
64 pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1);
65
66 /* Free all of the mtd devices */
67 list_for_each_entry_safe(map, scratch, &window->maps, list) {
68 if (map->rsrc.parent)
69 release_resource(&map->rsrc);
70 del_mtd_device(map->mtd);
71 map_destroy(map->mtd);
72 list_del(&map->list);
73 kfree(map);
74 }
75 if (window->rsrc.parent)
76 release_resource(&window->rsrc);
77 if (window->virt) {
78 iounmap(window->virt);
79 window->virt = NULL;
80 window->phys = 0;
81 window->size = 0;
82 window->pdev = NULL;
83 }
84}
85
86
87static int __devinit ichxrom_init_one (struct pci_dev *pdev,
88 const struct pci_device_id *ent)
89{
90 static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
91 struct ichxrom_window *window = &ichxrom_window;
92 struct ichxrom_map_info *map = NULL;
93 unsigned long map_top;
94 u8 byte;
95 u16 word;
96
97 /* For now I just handle the ichx and I assume there
98 * are not a lot of resources up at the top of the address
99 * space. It is possible to handle other devices in the
100 * top 16MB but it is very painful. Also since
101 * you can only really attach a FWH to an ICHX there
102 * a number of simplifications you can make.
103 *
104 * Also you can page firmware hubs if an 8MB window isn't enough
105 * but don't currently handle that case either.
106 */
107 window->pdev = pdev;
108
109 /* Find a region continuous to the end of the ROM window */
110 window->phys = 0;
111 pci_read_config_byte(pdev, FWH_DEC_EN1, &byte);
112 if (byte == 0xff) {
113 window->phys = 0xffc00000;
114 pci_read_config_byte(pdev, FWH_DEC_EN2, &byte);
115 if ((byte & 0x0f) == 0x0f) {
116 window->phys = 0xff400000;
117 }
118 else if ((byte & 0x0e) == 0x0e) {
119 window->phys = 0xff500000;
120 }
121 else if ((byte & 0x0c) == 0x0c) {
122 window->phys = 0xff600000;
123 }
124 else if ((byte & 0x08) == 0x08) {
125 window->phys = 0xff700000;
126 }
127 }
128 else if ((byte & 0xfe) == 0xfe) {
129 window->phys = 0xffc80000;
130 }
131 else if ((byte & 0xfc) == 0xfc) {
132 window->phys = 0xffd00000;
133 }
134 else if ((byte & 0xf8) == 0xf8) {
135 window->phys = 0xffd80000;
136 }
137 else if ((byte & 0xf0) == 0xf0) {
138 window->phys = 0xffe00000;
139 }
140 else if ((byte & 0xe0) == 0xe0) {
141 window->phys = 0xffe80000;
142 }
143 else if ((byte & 0xc0) == 0xc0) {
144 window->phys = 0xfff00000;
145 }
146 else if ((byte & 0x80) == 0x80) {
147 window->phys = 0xfff80000;
148 }
149
150 if (window->phys == 0) {
151 printk(KERN_ERR MOD_NAME ": Rom window is closed\n");
152 goto out;
153 }
154 window->phys -= 0x400000UL;
155 window->size = (0xffffffffUL - window->phys) + 1UL;
156
157 /* Enable writes through the rom window */
158 pci_read_config_word(pdev, BIOS_CNTL, &word);
159 if (!(word & 1) && (word & (1<<1))) {
160 /* The BIOS will generate an error if I enable
161 * this device, so don't even try.
162 */
163 printk(KERN_ERR MOD_NAME ": firmware access control, I can't enable writes\n");
164 goto out;
165 }
166 pci_write_config_word(pdev, BIOS_CNTL, word | 1);
167
168 /*
169 * Try to reserve the window mem region. If this fails then
170 * it is likely due to the window being "reseved" by the BIOS.
171 */
172 window->rsrc.name = MOD_NAME;
173 window->rsrc.start = window->phys;
174 window->rsrc.end = window->phys + window->size - 1;
175 window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
176 if (request_resource(&iomem_resource, &window->rsrc)) {
177 window->rsrc.parent = NULL;
178 printk(KERN_DEBUG MOD_NAME
179 ": %s(): Unable to register resource"
180 " 0x%.08lx-0x%.08lx - kernel bug?\n",
181 __func__,
182 window->rsrc.start, window->rsrc.end);
183 }
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 */
229 sprintf(map->map_name, "%s @%08lx",
230 MOD_NAME, map->map.phys);
231
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 */
236 for(map->map.bankwidth = 32; map->map.bankwidth;
237 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
261 " rom(%u) larger than window(%lu). fixing...\n",
262 map->mtd->size, map->map.size);
263 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 }
289
290 /* 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 */
309 if (map) {
310 kfree(map);
311 }
312 /* See if I have any map structures */
313 if (list_empty(&window->maps)) {
314 ichxrom_cleanup(window);
315 return -ENODEV;
316 }
317 return 0;
318}
319
320
321static void __devexit ichxrom_remove_one (struct pci_dev *pdev)
322{
323 struct ichxrom_window *window = &ichxrom_window;
324 ichxrom_cleanup(window);
325}
326
327static struct pci_device_id ichxrom_pci_tbl[] __devinitdata = {
328 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0,
329 PCI_ANY_ID, PCI_ANY_ID, },
330 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
331 PCI_ANY_ID, PCI_ANY_ID, },
332 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,
333 PCI_ANY_ID, PCI_ANY_ID, },
334 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
335 PCI_ANY_ID, PCI_ANY_ID, },
336 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1,
337 PCI_ANY_ID, PCI_ANY_ID, },
338 { 0, },
339};
340
341MODULE_DEVICE_TABLE(pci, ichxrom_pci_tbl);
342
343#if 0
344static struct pci_driver ichxrom_driver = {
345 .name = MOD_NAME,
346 .id_table = ichxrom_pci_tbl,
347 .probe = ichxrom_init_one,
348 .remove = ichxrom_remove_one,
349};
350#endif
351
352static int __init init_ichxrom(void)
353{
354 struct pci_dev *pdev;
355 struct pci_device_id *id;
356
357 pdev = NULL;
358 for (id = ichxrom_pci_tbl; id->vendor; id++) {
359 pdev = pci_find_device(id->vendor, id->device, NULL);
360 if (pdev) {
361 break;
362 }
363 }
364 if (pdev) {
365 return ichxrom_init_one(pdev, &ichxrom_pci_tbl[0]);
366 }
367 return -ENXIO;
368#if 0
369 return pci_module_init(&ichxrom_driver);
370#endif
371}
372
373static void __exit cleanup_ichxrom(void)
374{
375 ichxrom_remove_one(ichxrom_window.pdev);
376}
377
378module_init(init_ichxrom);
379module_exit(cleanup_ichxrom);
380
381MODULE_LICENSE("GPL");
382MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
383MODULE_DESCRIPTION("MTD map driver for BIOS chips on the ICHX southbridge");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-14 21:10:30 -0500