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Linux/drivers/mtd/maps/ichxrom.c

  1 /*
  2  * ichxrom.c
  3  *
  4  * Normal mappings of chips in physical memory
  5  */
  6 
  7 #include <linux/module.h>
  8 #include <linux/types.h>
  9 #include <linux/kernel.h>
 10 #include <linux/init.h>
 11 #include <linux/slab.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/pci.h>
 18 #include <linux/pci_ids.h>
 19 #include <linux/list.h>
 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) /* 64KiB */
 28 
 29 #define BIOS_CNTL       0x4e
 30 #define FWH_DEC_EN1     0xE3
 31 #define FWH_DEC_EN2     0xF0
 32 #define FWH_SEL1        0xE8
 33 #define FWH_SEL2        0xEE
 34 
 35 struct ichxrom_window {
 36         void __iomem* virt;
 37         unsigned long phys;
 38         unsigned long size;
 39         struct list_head maps;
 40         struct resource rsrc;
 41         struct pci_dev *pdev;
 42 };
 43 
 44 struct ichxrom_map_info {
 45         struct list_head list;
 46         struct map_info map;
 47         struct mtd_info *mtd;
 48         struct resource rsrc;
 49         char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
 50 };
 51 
 52 static struct ichxrom_window ichxrom_window = {
 53         .maps = LIST_HEAD_INIT(ichxrom_window.maps),
 54 };
 55 
 56 static void ichxrom_cleanup(struct ichxrom_window *window)
 57 {
 58         struct ichxrom_map_info *map, *scratch;
 59         u16 word;
 60 
 61         /* Disable writes through the rom window */
 62         pci_read_config_word(window->pdev, BIOS_CNTL, &word);
 63         pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1);
 64         pci_dev_put(window->pdev);
 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                 mtd_device_unregister(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 
 87 static int 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 %pR - kernel bug?\n",
180                        __func__, &window->rsrc);
181         }
182 
183         /* Map the firmware hub into my address space. */
184         window->virt = ioremap_nocache(window->phys, window->size);
185         if (!window->virt) {
186                 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
187                         window->phys, window->size);
188                 goto out;
189         }
190 
191         /* Get the first address to look for an rom chip at */
192         map_top = window->phys;
193         if ((window->phys & 0x3fffff) != 0) {
194                 map_top = window->phys + 0x400000;
195         }
196 #if 1
197         /* The probe sequence run over the firmware hub lock
198          * registers sets them to 0x7 (no access).
199          * Probe at most the last 4M of the address space.
200          */
201         if (map_top < 0xffc00000) {
202                 map_top = 0xffc00000;
203         }
204 #endif
205         /* Loop through and look for rom chips */
206         while((map_top - 1) < 0xffffffffUL) {
207                 struct cfi_private *cfi;
208                 unsigned long offset;
209                 int i;
210 
211                 if (!map) {
212                         map = kmalloc(sizeof(*map), GFP_KERNEL);
213                 }
214                 if (!map) {
215                         printk(KERN_ERR MOD_NAME ": kmalloc failed");
216                         goto out;
217                 }
218                 memset(map, 0, sizeof(*map));
219                 INIT_LIST_HEAD(&map->list);
220                 map->map.name = map->map_name;
221                 map->map.phys = map_top;
222                 offset = map_top - window->phys;
223                 map->map.virt = (void __iomem *)
224                         (((unsigned long)(window->virt)) + offset);
225                 map->map.size = 0xffffffffUL - map_top + 1UL;
226                 /* Set the name of the map to the address I am trying */
227                 sprintf(map->map_name, "%s @%08Lx",
228                         MOD_NAME, (unsigned long long)map->map.phys);
229 
230                 /* Firmware hubs only use vpp when being programmed
231                  * in a factory setting.  So in-place programming
232                  * needs to use a different method.
233                  */
234                 for(map->map.bankwidth = 32; map->map.bankwidth;
235                         map->map.bankwidth >>= 1)
236                 {
237                         char **probe_type;
238                         /* Skip bankwidths that are not supported */
239                         if (!map_bankwidth_supported(map->map.bankwidth))
240                                 continue;
241 
242                         /* Setup the map methods */
243                         simple_map_init(&map->map);
244 
245                         /* Try all of the probe methods */
246                         probe_type = rom_probe_types;
247                         for(; *probe_type; probe_type++) {
248                                 map->mtd = do_map_probe(*probe_type, &map->map);
249                                 if (map->mtd)
250                                         goto found;
251                         }
252                 }
253                 map_top += ROM_PROBE_STEP_SIZE;
254                 continue;
255         found:
256                 /* Trim the size if we are larger than the map */
257                 if (map->mtd->size > map->map.size) {
258                         printk(KERN_WARNING MOD_NAME
259                                 " rom(%llu) larger than window(%lu). fixing...\n",
260                                 (unsigned long long)map->mtd->size, map->map.size);
261                         map->mtd->size = map->map.size;
262                 }
263                 if (window->rsrc.parent) {
264                         /*
265                          * Registering the MTD device in iomem may not be possible
266                          * if there is a BIOS "reserved" and BUSY range.  If this
267                          * fails then continue anyway.
268                          */
269                         map->rsrc.name  = map->map_name;
270                         map->rsrc.start = map->map.phys;
271                         map->rsrc.end   = map->map.phys + map->mtd->size - 1;
272                         map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
273                         if (request_resource(&window->rsrc, &map->rsrc)) {
274                                 printk(KERN_ERR MOD_NAME
275                                         ": cannot reserve MTD resource\n");
276                                 map->rsrc.parent = NULL;
277                         }
278                 }
279 
280                 /* Make the whole region visible in the map */
281                 map->map.virt = window->virt;
282                 map->map.phys = window->phys;
283                 cfi = map->map.fldrv_priv;
284                 for(i = 0; i < cfi->numchips; i++) {
285                         cfi->chips[i].start += offset;
286                 }
287 
288                 /* Now that the mtd devices is complete claim and export it */
289                 map->mtd->owner = THIS_MODULE;
290                 if (mtd_device_register(map->mtd, NULL, 0)) {
291                         map_destroy(map->mtd);
292                         map->mtd = NULL;
293                         goto out;
294                 }
295 
296 
297                 /* Calculate the new value of map_top */
298                 map_top += map->mtd->size;
299 
300                 /* File away the map structure */
301                 list_add(&map->list, &window->maps);
302                 map = NULL;
303         }
304 
305  out:
306         /* Free any left over map structures */
307         kfree(map);
308 
309         /* See if I have any map structures */
310         if (list_empty(&window->maps)) {
311                 ichxrom_cleanup(window);
312                 return -ENODEV;
313         }
314         return 0;
315 }
316 
317 
318 static void ichxrom_remove_one(struct pci_dev *pdev)
319 {
320         struct ichxrom_window *window = &ichxrom_window;
321         ichxrom_cleanup(window);
322 }
323 
324 static struct pci_device_id ichxrom_pci_tbl[] = {
325         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0,
326           PCI_ANY_ID, PCI_ANY_ID, },
327         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
328           PCI_ANY_ID, PCI_ANY_ID, },
329         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,
330           PCI_ANY_ID, PCI_ANY_ID, },
331         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
332           PCI_ANY_ID, PCI_ANY_ID, },
333         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1,
334           PCI_ANY_ID, PCI_ANY_ID, },
335         { 0, },
336 };
337 
338 #if 0
339 MODULE_DEVICE_TABLE(pci, ichxrom_pci_tbl);
340 
341 static struct pci_driver ichxrom_driver = {
342         .name =         MOD_NAME,
343         .id_table =     ichxrom_pci_tbl,
344         .probe =        ichxrom_init_one,
345         .remove =       ichxrom_remove_one,
346 };
347 #endif
348 
349 static int __init init_ichxrom(void)
350 {
351         struct pci_dev *pdev;
352         struct pci_device_id *id;
353 
354         pdev = NULL;
355         for (id = ichxrom_pci_tbl; id->vendor; id++) {
356                 pdev = pci_get_device(id->vendor, id->device, NULL);
357                 if (pdev) {
358                         break;
359                 }
360         }
361         if (pdev) {
362                 return ichxrom_init_one(pdev, &ichxrom_pci_tbl[0]);
363         }
364         return -ENXIO;
365 #if 0
366         return pci_register_driver(&ichxrom_driver);
367 #endif
368 }
369 
370 static void __exit cleanup_ichxrom(void)
371 {
372         ichxrom_remove_one(ichxrom_window.pdev);
373 }
374 
375 module_init(init_ichxrom);
376 module_exit(cleanup_ichxrom);
377 
378 MODULE_LICENSE("GPL");
379 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
380 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the ICHX southbridge");
381 

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