Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild
[linux-2.6] / drivers / mtd / maps / nettel.c
1 /****************************************************************************/
2
3 /*
4  *      nettel.c -- mappings for NETtel/SecureEdge/SnapGear (x86) boards.
5  *
6  *      (C) Copyright 2000-2001, Greg Ungerer (gerg@snapgear.com)
7  *      (C) Copyright 2001-2002, SnapGear (www.snapgear.com)
8  *
9  *      $Id: nettel.c,v 1.12 2005/11/29 14:30:00 gleixner Exp $
10  */
11
12 /****************************************************************************/
13
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/map.h>
20 #include <linux/mtd/partitions.h>
21 #include <linux/mtd/cfi.h>
22 #include <linux/reboot.h>
23 #include <linux/err.h>
24 #include <linux/kdev_t.h>
25 #include <linux/root_dev.h>
26 #include <asm/io.h>
27
28 /****************************************************************************/
29
30 #define INTEL_BUSWIDTH          1
31 #define AMD_WINDOW_MAXSIZE      0x00200000
32 #define AMD_BUSWIDTH            1
33
34 /*
35  *      PAR masks and shifts, assuming 64K pages.
36  */
37 #define SC520_PAR_ADDR_MASK     0x00003fff
38 #define SC520_PAR_ADDR_SHIFT    16
39 #define SC520_PAR_TO_ADDR(par) \
40         (((par)&SC520_PAR_ADDR_MASK) << SC520_PAR_ADDR_SHIFT)
41
42 #define SC520_PAR_SIZE_MASK     0x01ffc000
43 #define SC520_PAR_SIZE_SHIFT    2
44 #define SC520_PAR_TO_SIZE(par) \
45         ((((par)&SC520_PAR_SIZE_MASK) << SC520_PAR_SIZE_SHIFT) + (64*1024))
46
47 #define SC520_PAR(cs, addr, size) \
48         ((cs) | \
49         ((((size)-(64*1024)) >> SC520_PAR_SIZE_SHIFT) & SC520_PAR_SIZE_MASK) | \
50         (((addr) >> SC520_PAR_ADDR_SHIFT) & SC520_PAR_ADDR_MASK))
51
52 #define SC520_PAR_BOOTCS        0x8a000000
53 #define SC520_PAR_ROMCS1        0xaa000000
54 #define SC520_PAR_ROMCS2        0xca000000      /* Cache disabled, 64K page */
55
56 static void *nettel_mmcrp = NULL;
57
58 #ifdef CONFIG_MTD_CFI_INTELEXT
59 static struct mtd_info *intel_mtd;
60 #endif
61 static struct mtd_info *amd_mtd;
62
63 /****************************************************************************/
64
65 /****************************************************************************/
66
67 #ifdef CONFIG_MTD_CFI_INTELEXT
68 static struct map_info nettel_intel_map = {
69         .name = "SnapGear Intel",
70         .size = 0,
71         .bankwidth = INTEL_BUSWIDTH,
72 };
73
74 static struct mtd_partition nettel_intel_partitions[] = {
75         {
76                 .name = "SnapGear kernel",
77                 .offset = 0,
78                 .size = 0x000e0000
79         },
80         {
81                 .name = "SnapGear filesystem",
82                 .offset = 0x00100000,
83         },
84         {
85                 .name = "SnapGear config",
86                 .offset = 0x000e0000,
87                 .size = 0x00020000
88         },
89         {
90                 .name = "SnapGear Intel",
91                 .offset = 0
92         },
93         {
94                 .name = "SnapGear BIOS Config",
95                 .offset = 0x007e0000,
96                 .size = 0x00020000
97         },
98         {
99                 .name = "SnapGear BIOS",
100                 .offset = 0x007e0000,
101                 .size = 0x00020000
102         },
103 };
104 #endif
105
106 static struct map_info nettel_amd_map = {
107         .name = "SnapGear AMD",
108         .size = AMD_WINDOW_MAXSIZE,
109         .bankwidth = AMD_BUSWIDTH,
110 };
111
112 static struct mtd_partition nettel_amd_partitions[] = {
113         {
114                 .name = "SnapGear BIOS config",
115                 .offset = 0x000e0000,
116                 .size = 0x00010000
117         },
118         {
119                 .name = "SnapGear BIOS",
120                 .offset = 0x000f0000,
121                 .size = 0x00010000
122         },
123         {
124                 .name = "SnapGear AMD",
125                 .offset = 0
126         },
127         {
128                 .name = "SnapGear high BIOS",
129                 .offset = 0x001f0000,
130                 .size = 0x00010000
131         }
132 };
133
134 #define NUM_AMD_PARTITIONS ARRAY_SIZE(nettel_amd_partitions)
135
136 /****************************************************************************/
137
138 #ifdef CONFIG_MTD_CFI_INTELEXT
139
140 /*
141  *      Set the Intel flash back to read mode since some old boot
142  *      loaders don't.
143  */
144 static int nettel_reboot_notifier(struct notifier_block *nb, unsigned long val, void *v)
145 {
146         struct cfi_private *cfi = nettel_intel_map.fldrv_priv;
147         unsigned long b;
148
149         /* Make sure all FLASH chips are put back into read mode */
150         for (b = 0; (b < nettel_intel_partitions[3].size); b += 0x100000) {
151                 cfi_send_gen_cmd(0xff, 0x55, b, &nettel_intel_map, cfi,
152                         cfi->device_type, NULL);
153         }
154         return(NOTIFY_OK);
155 }
156
157 static struct notifier_block nettel_notifier_block = {
158         nettel_reboot_notifier, NULL, 0
159 };
160
161 #endif
162
163 /****************************************************************************/
164
165 static int __init nettel_init(void)
166 {
167         volatile unsigned long *amdpar;
168         unsigned long amdaddr, maxsize;
169         int num_amd_partitions=0;
170 #ifdef CONFIG_MTD_CFI_INTELEXT
171         volatile unsigned long *intel0par, *intel1par;
172         unsigned long orig_bootcspar, orig_romcs1par;
173         unsigned long intel0addr, intel0size;
174         unsigned long intel1addr, intel1size;
175         int intelboot, intel0cs, intel1cs;
176         int num_intel_partitions;
177 #endif
178         int rc = 0;
179
180         nettel_mmcrp = (void *) ioremap_nocache(0xfffef000, 4096);
181         if (nettel_mmcrp == NULL) {
182                 printk("SNAPGEAR: failed to disable MMCR cache??\n");
183                 return(-EIO);
184         }
185
186         /* Set CPU clock to be 33.000MHz */
187         *((unsigned char *) (nettel_mmcrp + 0xc64)) = 0x01;
188
189         amdpar = (volatile unsigned long *) (nettel_mmcrp + 0xc4);
190
191 #ifdef CONFIG_MTD_CFI_INTELEXT
192         intelboot = 0;
193         intel0cs = SC520_PAR_ROMCS1;
194         intel0par = (volatile unsigned long *) (nettel_mmcrp + 0xc0);
195         intel1cs = SC520_PAR_ROMCS2;
196         intel1par = (volatile unsigned long *) (nettel_mmcrp + 0xbc);
197
198         /*
199          *      Save the CS settings then ensure ROMCS1 and ROMCS2 are off,
200          *      otherwise they might clash with where we try to map BOOTCS.
201          */
202         orig_bootcspar = *amdpar;
203         orig_romcs1par = *intel0par;
204         *intel0par = 0;
205         *intel1par = 0;
206 #endif
207
208         /*
209          *      The first thing to do is determine if we have a separate
210          *      boot FLASH device. Typically this is a small (1 to 2MB)
211          *      AMD FLASH part. It seems that device size is about the
212          *      only way to tell if this is the case...
213          */
214         amdaddr = 0x20000000;
215         maxsize = AMD_WINDOW_MAXSIZE;
216
217         *amdpar = SC520_PAR(SC520_PAR_BOOTCS, amdaddr, maxsize);
218         __asm__ ("wbinvd");
219
220         nettel_amd_map.phys = amdaddr;
221         nettel_amd_map.virt = ioremap_nocache(amdaddr, maxsize);
222         if (!nettel_amd_map.virt) {
223                 printk("SNAPGEAR: failed to ioremap() BOOTCS\n");
224                 iounmap(nettel_mmcrp);
225                 return(-EIO);
226         }
227         simple_map_init(&nettel_amd_map);
228
229         if ((amd_mtd = do_map_probe("jedec_probe", &nettel_amd_map))) {
230                 printk(KERN_NOTICE "SNAPGEAR: AMD flash device size = %dK\n",
231                         amd_mtd->size>>10);
232
233                 amd_mtd->owner = THIS_MODULE;
234
235                 /* The high BIOS partition is only present for 2MB units */
236                 num_amd_partitions = NUM_AMD_PARTITIONS;
237                 if (amd_mtd->size < AMD_WINDOW_MAXSIZE)
238                         num_amd_partitions--;
239                 /* Don't add the partition until after the primary INTEL's */
240
241 #ifdef CONFIG_MTD_CFI_INTELEXT
242                 /*
243                  *      Map the Intel flash into memory after the AMD
244                  *      It has to start on a multiple of maxsize.
245                  */
246                 maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);
247                 if (maxsize < (32 * 1024 * 1024))
248                         maxsize = (32 * 1024 * 1024);
249                 intel0addr = amdaddr + maxsize;
250 #endif
251         } else {
252 #ifdef CONFIG_MTD_CFI_INTELEXT
253                 /* INTEL boot FLASH */
254                 intelboot++;
255
256                 if (!orig_romcs1par) {
257                         intel0cs = SC520_PAR_BOOTCS;
258                         intel0par = (volatile unsigned long *)
259                                 (nettel_mmcrp + 0xc4);
260                         intel1cs = SC520_PAR_ROMCS1;
261                         intel1par = (volatile unsigned long *)
262                                 (nettel_mmcrp + 0xc0);
263
264                         intel0addr = SC520_PAR_TO_ADDR(orig_bootcspar);
265                         maxsize = SC520_PAR_TO_SIZE(orig_bootcspar);
266                 } else {
267                         /* Kernel base is on ROMCS1, not BOOTCS */
268                         intel0cs = SC520_PAR_ROMCS1;
269                         intel0par = (volatile unsigned long *)
270                                 (nettel_mmcrp + 0xc0);
271                         intel1cs = SC520_PAR_BOOTCS;
272                         intel1par = (volatile unsigned long *)
273                                 (nettel_mmcrp + 0xc4);
274
275                         intel0addr = SC520_PAR_TO_ADDR(orig_romcs1par);
276                         maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);
277                 }
278
279                 /* Destroy useless AMD MTD mapping */
280                 amd_mtd = NULL;
281                 iounmap(nettel_amd_map.virt);
282                 nettel_amd_map.virt = NULL;
283 #else
284                 /* Only AMD flash supported */
285                 rc = -ENXIO;
286                 goto out_unmap2;
287 #endif
288         }
289
290 #ifdef CONFIG_MTD_CFI_INTELEXT
291         /*
292          *      We have determined the INTEL FLASH configuration, so lets
293          *      go ahead and probe for them now.
294          */
295
296         /* Set PAR to the maximum size */
297         if (maxsize < (32 * 1024 * 1024))
298                 maxsize = (32 * 1024 * 1024);
299         *intel0par = SC520_PAR(intel0cs, intel0addr, maxsize);
300
301         /* Turn other PAR off so the first probe doesn't find it */
302         *intel1par = 0;
303
304         /* Probe for the size of the first Intel flash */
305         nettel_intel_map.size = maxsize;
306         nettel_intel_map.phys = intel0addr;
307         nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
308         if (!nettel_intel_map.virt) {
309                 printk("SNAPGEAR: failed to ioremap() ROMCS1\n");
310                 rc = -EIO;
311                 goto out_unmap2;
312         }
313         simple_map_init(&nettel_intel_map);
314
315         intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
316         if (!intel_mtd) {
317                 rc = -ENXIO;
318                 goto out_unmap1;
319         }
320
321         /* Set PAR to the detected size */
322         intel0size = intel_mtd->size;
323         *intel0par = SC520_PAR(intel0cs, intel0addr, intel0size);
324
325         /*
326          *      Map second Intel FLASH right after first. Set its size to the
327          *      same maxsize used for the first Intel FLASH.
328          */
329         intel1addr = intel0addr + intel0size;
330         *intel1par = SC520_PAR(intel1cs, intel1addr, maxsize);
331         __asm__ ("wbinvd");
332
333         maxsize += intel0size;
334
335         /* Delete the old map and probe again to do both chips */
336         map_destroy(intel_mtd);
337         intel_mtd = NULL;
338         iounmap(nettel_intel_map.virt);
339
340         nettel_intel_map.size = maxsize;
341         nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
342         if (!nettel_intel_map.virt) {
343                 printk("SNAPGEAR: failed to ioremap() ROMCS1/2\n");
344                 rc = -EIO;
345                 goto out_unmap2;
346         }
347
348         intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
349         if (! intel_mtd) {
350                 rc = -ENXIO;
351                 goto out_unmap1;
352         }
353
354         intel1size = intel_mtd->size - intel0size;
355         if (intel1size > 0) {
356                 *intel1par = SC520_PAR(intel1cs, intel1addr, intel1size);
357                 __asm__ ("wbinvd");
358         } else {
359                 *intel1par = 0;
360         }
361
362         printk(KERN_NOTICE "SNAPGEAR: Intel flash device size = %dK\n",
363                 (intel_mtd->size >> 10));
364
365         intel_mtd->owner = THIS_MODULE;
366
367         num_intel_partitions = sizeof(nettel_intel_partitions) /
368                 sizeof(nettel_intel_partitions[0]);
369
370         if (intelboot) {
371                 /*
372                  *      Adjust offset and size of last boot partition.
373                  *      Must allow for BIOS region at end of FLASH.
374                  */
375                 nettel_intel_partitions[1].size = (intel0size + intel1size) -
376                         (1024*1024 + intel_mtd->erasesize);
377                 nettel_intel_partitions[3].size = intel0size + intel1size;
378                 nettel_intel_partitions[4].offset =
379                         (intel0size + intel1size) - intel_mtd->erasesize;
380                 nettel_intel_partitions[4].size = intel_mtd->erasesize;
381                 nettel_intel_partitions[5].offset =
382                         nettel_intel_partitions[4].offset;
383                 nettel_intel_partitions[5].size =
384                         nettel_intel_partitions[4].size;
385         } else {
386                 /* No BIOS regions when AMD boot */
387                 num_intel_partitions -= 2;
388         }
389         rc = add_mtd_partitions(intel_mtd, nettel_intel_partitions,
390                 num_intel_partitions);
391 #endif
392
393         if (amd_mtd) {
394                 rc = add_mtd_partitions(amd_mtd, nettel_amd_partitions,
395                         num_amd_partitions);
396         }
397
398 #ifdef CONFIG_MTD_CFI_INTELEXT
399         register_reboot_notifier(&nettel_notifier_block);
400 #endif
401
402         return(rc);
403
404 #ifdef CONFIG_MTD_CFI_INTELEXT
405 out_unmap1:
406         iounmap(nettel_intel_map.virt);
407 #endif
408
409 out_unmap2:
410         iounmap(nettel_mmcrp);
411         iounmap(nettel_amd_map.virt);
412
413         return(rc);
414
415 }
416
417 /****************************************************************************/
418
419 static void __exit nettel_cleanup(void)
420 {
421 #ifdef CONFIG_MTD_CFI_INTELEXT
422         unregister_reboot_notifier(&nettel_notifier_block);
423 #endif
424         if (amd_mtd) {
425                 del_mtd_partitions(amd_mtd);
426                 map_destroy(amd_mtd);
427         }
428         if (nettel_mmcrp) {
429                 iounmap(nettel_mmcrp);
430                 nettel_mmcrp = NULL;
431         }
432         if (nettel_amd_map.virt) {
433                 iounmap(nettel_amd_map.virt);
434                 nettel_amd_map.virt = NULL;
435         }
436 #ifdef CONFIG_MTD_CFI_INTELEXT
437         if (intel_mtd) {
438                 del_mtd_partitions(intel_mtd);
439                 map_destroy(intel_mtd);
440         }
441         if (nettel_intel_map.virt) {
442                 iounmap(nettel_intel_map.virt);
443                 nettel_intel_map.virt = NULL;
444         }
445 #endif
446 }
447
448 /****************************************************************************/
449
450 module_init(nettel_init);
451 module_exit(nettel_cleanup);
452
453 MODULE_LICENSE("GPL");
454 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
455 MODULE_DESCRIPTION("SnapGear/SecureEdge FLASH support");
456
457 /****************************************************************************/