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90afffc8 DO |
1 | /* |
2 | * ck804xrom.c | |
3 | * | |
4 | * Normal mappings of chips in physical memory | |
5 | * | |
6 | * Dave Olsen <dolsen@lnxi.com> | |
7 | * Ryan Jackson <rjackson@lnxi.com> | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/version.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <asm/io.h> | |
16 | #include <linux/mtd/mtd.h> | |
17 | #include <linux/mtd/map.h> | |
18 | #include <linux/mtd/cfi.h> | |
19 | #include <linux/mtd/flashchip.h> | |
20 | #include <linux/pci.h> | |
21 | #include <linux/pci_ids.h> | |
22 | #include <linux/list.h> | |
23 | ||
24 | ||
25 | #define MOD_NAME KBUILD_BASENAME | |
26 | ||
27 | #define ADDRESS_NAME_LEN 18 | |
28 | ||
c9ac5977 | 29 | #define ROM_PROBE_STEP_SIZE (64*1024) |
90afffc8 DO |
30 | |
31 | struct ck804xrom_window { | |
32 | void __iomem *virt; | |
33 | unsigned long phys; | |
34 | unsigned long size; | |
35 | struct list_head maps; | |
36 | struct resource rsrc; | |
37 | struct pci_dev *pdev; | |
38 | }; | |
39 | ||
40 | struct ck804xrom_map_info { | |
41 | struct list_head list; | |
42 | struct map_info map; | |
43 | struct mtd_info *mtd; | |
44 | struct resource rsrc; | |
45 | char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN]; | |
46 | }; | |
47 | ||
48 | ||
49 | /* The 2 bits controlling the window size are often set to allow reading | |
50 | * the BIOS, but too small to allow writing, since the lock registers are | |
51 | * 4MiB lower in the address space than the data. | |
52 | * | |
53 | * This is intended to prevent flashing the bios, perhaps accidentally. | |
54 | * | |
55 | * This parameter allows the normal driver to override the BIOS settings. | |
56 | * | |
57 | * The bits are 6 and 7. If both bits are set, it is a 5MiB window. | |
58 | * If only the 7 Bit is set, it is a 4MiB window. Otherwise, a | |
59 | * 64KiB window. | |
60 | * | |
61 | */ | |
62 | static uint win_size_bits = 0; | |
63 | module_param(win_size_bits, uint, 0); | |
64 | MODULE_PARM_DESC(win_size_bits, "ROM window size bits override for 0x88 byte, normally set by BIOS."); | |
65 | ||
66 | static struct ck804xrom_window ck804xrom_window = { | |
67 | .maps = LIST_HEAD_INIT(ck804xrom_window.maps), | |
68 | }; | |
69 | ||
70 | static void ck804xrom_cleanup(struct ck804xrom_window *window) | |
71 | { | |
72 | struct ck804xrom_map_info *map, *scratch; | |
73 | u8 byte; | |
74 | ||
75 | if (window->pdev) { | |
76 | /* Disable writes through the rom window */ | |
77 | pci_read_config_byte(window->pdev, 0x6d, &byte); | |
78 | pci_write_config_byte(window->pdev, 0x6d, byte & ~1); | |
79 | } | |
80 | ||
81 | /* Free all of the mtd devices */ | |
82 | list_for_each_entry_safe(map, scratch, &window->maps, list) { | |
83 | if (map->rsrc.parent) | |
84 | release_resource(&map->rsrc); | |
85 | ||
86 | del_mtd_device(map->mtd); | |
87 | map_destroy(map->mtd); | |
88 | list_del(&map->list); | |
89 | kfree(map); | |
90 | } | |
91 | if (window->rsrc.parent) | |
92 | release_resource(&window->rsrc); | |
93 | ||
94 | if (window->virt) { | |
95 | iounmap(window->virt); | |
96 | window->virt = NULL; | |
97 | window->phys = 0; | |
98 | window->size = 0; | |
99 | } | |
100 | pci_dev_put(window->pdev); | |
101 | } | |
102 | ||
103 | ||
104 | static int __devinit ck804xrom_init_one (struct pci_dev *pdev, | |
105 | const struct pci_device_id *ent) | |
106 | { | |
107 | static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL }; | |
108 | u8 byte; | |
109 | struct ck804xrom_window *window = &ck804xrom_window; | |
110 | struct ck804xrom_map_info *map = NULL; | |
111 | unsigned long map_top; | |
112 | ||
113 | /* Remember the pci dev I find the window in */ | |
114 | window->pdev = pci_dev_get(pdev); | |
115 | ||
116 | /* Enable the selected rom window. This is often incorrectly | |
117 | * set up by the BIOS, and the 4MiB offset for the lock registers | |
118 | * requires the full 5MiB of window space. | |
119 | * | |
120 | * This 'write, then read' approach leaves the bits for | |
121 | * other uses of the hardware info. | |
122 | */ | |
123 | pci_read_config_byte(pdev, 0x88, &byte); | |
124 | pci_write_config_byte(pdev, 0x88, byte | win_size_bits ); | |
125 | ||
126 | ||
127 | /* Assume the rom window is properly setup, and find it's size */ | |
128 | pci_read_config_byte(pdev, 0x88, &byte); | |
129 | ||
130 | if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) | |
131 | window->phys = 0xffb00000; /* 5MiB */ | |
132 | else if ((byte & (1<<7)) == (1<<7)) | |
133 | window->phys = 0xffc00000; /* 4MiB */ | |
134 | else | |
135 | window->phys = 0xffff0000; /* 64KiB */ | |
136 | ||
137 | window->size = 0xffffffffUL - window->phys + 1UL; | |
138 | ||
139 | /* | |
140 | * Try to reserve the window mem region. If this fails then | |
141 | * it is likely due to a fragment of the window being | |
142 | * "reserved" by the BIOS. In the case that the | |
143 | * request_mem_region() fails then once the rom size is | |
144 | * discovered we will try to reserve the unreserved fragment. | |
145 | */ | |
146 | window->rsrc.name = MOD_NAME; | |
147 | window->rsrc.start = window->phys; | |
148 | window->rsrc.end = window->phys + window->size - 1; | |
149 | window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
150 | if (request_resource(&iomem_resource, &window->rsrc)) { | |
151 | window->rsrc.parent = NULL; | |
152 | printk(KERN_ERR MOD_NAME | |
153 | " %s(): Unable to register resource" | |
154 | " 0x%.016llx-0x%.016llx - kernel bug?\n", | |
155 | __func__, | |
156 | (unsigned long long)window->rsrc.start, | |
157 | (unsigned long long)window->rsrc.end); | |
158 | } | |
159 | ||
160 | ||
161 | /* Enable writes through the rom window */ | |
162 | pci_read_config_byte(pdev, 0x6d, &byte); | |
163 | pci_write_config_byte(pdev, 0x6d, byte | 1); | |
164 | ||
165 | /* FIXME handle registers 0x80 - 0x8C the bios region locks */ | |
166 | ||
167 | /* For write accesses caches are useless */ | |
168 | window->virt = ioremap_nocache(window->phys, window->size); | |
169 | if (!window->virt) { | |
170 | printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n", | |
171 | window->phys, window->size); | |
172 | goto out; | |
173 | } | |
174 | ||
175 | /* Get the first address to look for a rom chip at */ | |
176 | map_top = window->phys; | |
177 | #if 1 | |
178 | /* The probe sequence run over the firmware hub lock | |
179 | * registers sets them to 0x7 (no access). | |
180 | * Probe at most the last 4MiB of the address space. | |
181 | */ | |
182 | if (map_top < 0xffc00000) | |
183 | map_top = 0xffc00000; | |
184 | #endif | |
185 | /* Loop through and look for rom chips. Since we don't know the | |
186 | * starting address for each chip, probe every ROM_PROBE_STEP_SIZE | |
187 | * bytes from the starting address of the window. | |
188 | */ | |
189 | while((map_top - 1) < 0xffffffffUL) { | |
190 | struct cfi_private *cfi; | |
191 | unsigned long offset; | |
192 | int i; | |
193 | ||
194 | if (!map) | |
195 | map = kmalloc(sizeof(*map), GFP_KERNEL); | |
196 | ||
197 | if (!map) { | |
198 | printk(KERN_ERR MOD_NAME ": kmalloc failed"); | |
199 | goto out; | |
200 | } | |
201 | memset(map, 0, sizeof(*map)); | |
202 | INIT_LIST_HEAD(&map->list); | |
203 | map->map.name = map->map_name; | |
204 | map->map.phys = map_top; | |
205 | offset = map_top - window->phys; | |
206 | map->map.virt = (void __iomem *) | |
207 | (((unsigned long)(window->virt)) + offset); | |
208 | map->map.size = 0xffffffffUL - map_top + 1UL; | |
209 | /* Set the name of the map to the address I am trying */ | |
65af0714 AM |
210 | sprintf(map->map_name, "%s @%08Lx", |
211 | MOD_NAME, (unsigned long long)map->map.phys); | |
90afffc8 DO |
212 | |
213 | /* There is no generic VPP support */ | |
214 | for(map->map.bankwidth = 32; map->map.bankwidth; | |
215 | map->map.bankwidth >>= 1) | |
216 | { | |
217 | char **probe_type; | |
218 | /* Skip bankwidths that are not supported */ | |
219 | if (!map_bankwidth_supported(map->map.bankwidth)) | |
220 | continue; | |
221 | ||
222 | /* Setup the map methods */ | |
223 | simple_map_init(&map->map); | |
224 | ||
225 | /* Try all of the probe methods */ | |
226 | probe_type = rom_probe_types; | |
227 | for(; *probe_type; probe_type++) { | |
228 | map->mtd = do_map_probe(*probe_type, &map->map); | |
229 | if (map->mtd) | |
230 | goto found; | |
231 | } | |
232 | } | |
233 | map_top += ROM_PROBE_STEP_SIZE; | |
234 | continue; | |
235 | found: | |
236 | /* Trim the size if we are larger than the map */ | |
237 | if (map->mtd->size > map->map.size) { | |
238 | printk(KERN_WARNING MOD_NAME | |
239 | " rom(%u) larger than window(%lu). fixing...\n", | |
240 | map->mtd->size, map->map.size); | |
241 | map->mtd->size = map->map.size; | |
242 | } | |
243 | if (window->rsrc.parent) { | |
244 | /* | |
245 | * Registering the MTD device in iomem may not be possible | |
246 | * if there is a BIOS "reserved" and BUSY range. If this | |
247 | * fails then continue anyway. | |
248 | */ | |
249 | map->rsrc.name = map->map_name; | |
250 | map->rsrc.start = map->map.phys; | |
251 | map->rsrc.end = map->map.phys + map->mtd->size - 1; | |
252 | map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
253 | if (request_resource(&window->rsrc, &map->rsrc)) { | |
254 | printk(KERN_ERR MOD_NAME | |
255 | ": cannot reserve MTD resource\n"); | |
256 | map->rsrc.parent = NULL; | |
257 | } | |
258 | } | |
259 | ||
260 | /* Make the whole region visible in the map */ | |
261 | map->map.virt = window->virt; | |
262 | map->map.phys = window->phys; | |
263 | cfi = map->map.fldrv_priv; | |
264 | for(i = 0; i < cfi->numchips; i++) | |
265 | cfi->chips[i].start += offset; | |
266 | ||
267 | /* Now that the mtd devices is complete claim and export it */ | |
268 | map->mtd->owner = THIS_MODULE; | |
269 | if (add_mtd_device(map->mtd)) { | |
270 | map_destroy(map->mtd); | |
271 | map->mtd = NULL; | |
272 | goto out; | |
273 | } | |
274 | ||
275 | ||
276 | /* Calculate the new value of map_top */ | |
277 | map_top += map->mtd->size; | |
278 | ||
279 | /* File away the map structure */ | |
280 | list_add(&map->list, &window->maps); | |
281 | map = NULL; | |
282 | } | |
283 | ||
284 | out: | |
285 | /* Free any left over map structures */ | |
286 | if (map) | |
287 | kfree(map); | |
288 | ||
289 | /* See if I have any map structures */ | |
290 | if (list_empty(&window->maps)) { | |
291 | ck804xrom_cleanup(window); | |
292 | return -ENODEV; | |
293 | } | |
294 | return 0; | |
295 | } | |
296 | ||
297 | ||
298 | static void __devexit ck804xrom_remove_one (struct pci_dev *pdev) | |
299 | { | |
300 | struct ck804xrom_window *window = &ck804xrom_window; | |
301 | ||
302 | ck804xrom_cleanup(window); | |
303 | } | |
304 | ||
305 | static struct pci_device_id ck804xrom_pci_tbl[] = { | |
306 | { PCI_VENDOR_ID_NVIDIA, 0x0051, | |
307 | PCI_ANY_ID, PCI_ANY_ID, }, /* nvidia ck804 */ | |
308 | { 0, } | |
309 | }; | |
310 | ||
311 | MODULE_DEVICE_TABLE(pci, ck804xrom_pci_tbl); | |
312 | ||
313 | #if 0 | |
314 | static struct pci_driver ck804xrom_driver = { | |
315 | .name = MOD_NAME, | |
316 | .id_table = ck804xrom_pci_tbl, | |
317 | .probe = ck804xrom_init_one, | |
318 | .remove = ck804xrom_remove_one, | |
319 | }; | |
320 | #endif | |
321 | ||
322 | static int __init init_ck804xrom(void) | |
323 | { | |
324 | struct pci_dev *pdev; | |
325 | struct pci_device_id *id; | |
326 | int retVal; | |
327 | pdev = NULL; | |
328 | ||
329 | for(id = ck804xrom_pci_tbl; id->vendor; id++) { | |
c033a7e3 | 330 | pdev = pci_get_device(id->vendor, id->device, NULL); |
90afffc8 DO |
331 | if (pdev) |
332 | break; | |
333 | } | |
334 | if (pdev) { | |
335 | retVal = ck804xrom_init_one(pdev, &ck804xrom_pci_tbl[0]); | |
336 | pci_dev_put(pdev); | |
337 | return retVal; | |
338 | } | |
339 | return -ENXIO; | |
340 | #if 0 | |
341 | return pci_module_init(&ck804xrom_driver); | |
342 | #endif | |
343 | } | |
344 | ||
345 | static void __exit cleanup_ck804xrom(void) | |
346 | { | |
347 | ck804xrom_remove_one(ck804xrom_window.pdev); | |
348 | } | |
349 | ||
350 | module_init(init_ck804xrom); | |
351 | module_exit(cleanup_ck804xrom); | |
352 | ||
353 | MODULE_LICENSE("GPL"); | |
354 | MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>, Dave Olsen <dolsen@lnxi.com>"); | |
355 | MODULE_DESCRIPTION("MTD map driver for BIOS chips on the Nvidia ck804 southbridge"); | |
356 |