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
10 /****************************************************************************/
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/map.h>
18 #include <linux/mtd/partitions.h>
19 #include <linux/mtd/cfi.h>
20 #include <linux/reboot.h>
21 #include <linux/err.h>
22 #include <linux/kdev_t.h>
23 #include <linux/root_dev.h>
24 #include <asm/io.h>
25
26 /****************************************************************************/
27
28 #define INTEL_BUSWIDTH 1
29 #define AMD_WINDOW_MAXSIZE 0x00200000
30 #define AMD_BUSWIDTH 1
31
32 /*
33 * PAR masks and shifts, assuming 64K pages.
34 */
35 #define SC520_PAR_ADDR_MASK 0x00003fff
36 #define SC520_PAR_ADDR_SHIFT 16
37 #define SC520_PAR_TO_ADDR(par) \
38 (((par)&SC520_PAR_ADDR_MASK) << SC520_PAR_ADDR_SHIFT)
39
40 #define SC520_PAR_SIZE_MASK 0x01ffc000
41 #define SC520_PAR_SIZE_SHIFT 2
42 #define SC520_PAR_TO_SIZE(par) \
43 ((((par)&SC520_PAR_SIZE_MASK) << SC520_PAR_SIZE_SHIFT) + (64*1024))
44
45 #define SC520_PAR(cs, addr, size) \
46 ((cs) | \
47 ((((size)-(64*1024)) >> SC520_PAR_SIZE_SHIFT) & SC520_PAR_SIZE_MASK) | \
48 (((addr) >> SC520_PAR_ADDR_SHIFT) & SC520_PAR_ADDR_MASK))
49
50 #define SC520_PAR_BOOTCS 0x8a000000
51 #define SC520_PAR_ROMCS1 0xaa000000
52 #define SC520_PAR_ROMCS2 0xca000000 /* Cache disabled, 64K page */
53
54 static void *nettel_mmcrp = NULL;
55
56 #ifdef CONFIG_MTD_CFI_INTELEXT
57 static struct mtd_info *intel_mtd;
58 #endif
59 static struct mtd_info *amd_mtd;
60
61 /****************************************************************************/
62
63 /****************************************************************************/
64
65 #ifdef CONFIG_MTD_CFI_INTELEXT
66 static struct map_info nettel_intel_map = {
67 .name = "SnapGear Intel",
68 .size = 0,
69 .bankwidth = INTEL_BUSWIDTH,
70 };
71
72 static struct mtd_partition nettel_intel_partitions[] = {
73 {
74 .name = "SnapGear kernel",
75 .offset = 0,
76 .size = 0x000e0000
77 },
78 {
79 .name = "SnapGear filesystem",
80 .offset = 0x00100000,
81 },
82 {
83 .name = "SnapGear config",
84 .offset = 0x000e0000,
85 .size = 0x00020000
86 },
87 {
88 .name = "SnapGear Intel",
89 .offset = 0
90 },
91 {
92 .name = "SnapGear BIOS Config",
93 .offset = 0x007e0000,
94 .size = 0x00020000
95 },
96 {
97 .name = "SnapGear BIOS",
98 .offset = 0x007e0000,
99 .size = 0x00020000
100 },
101 };
102 #endif
103
104 static struct map_info nettel_amd_map = {
105 .name = "SnapGear AMD",
106 .size = AMD_WINDOW_MAXSIZE,
107 .bankwidth = AMD_BUSWIDTH,
108 };
109
110 static const struct mtd_partition nettel_amd_partitions[] = {
111 {
112 .name = "SnapGear BIOS config",
113 .offset = 0x000e0000,
114 .size = 0x00010000
115 },
116 {
117 .name = "SnapGear BIOS",
118 .offset = 0x000f0000,
119 .size = 0x00010000
120 },
121 {
122 .name = "SnapGear AMD",
123 .offset = 0
124 },
125 {
126 .name = "SnapGear high BIOS",
127 .offset = 0x001f0000,
128 .size = 0x00010000
129 }
130 };
131
132 #define NUM_AMD_PARTITIONS ARRAY_SIZE(nettel_amd_partitions)
133
134 /****************************************************************************/
135
136 #ifdef CONFIG_MTD_CFI_INTELEXT
137
138 /*
139 * Set the Intel flash back to read mode since some old boot
140 * loaders don't.
141 */
nettel_reboot_notifier(struct notifier_block * nb,unsigned long val,void * v)142 static int nettel_reboot_notifier(struct notifier_block *nb, unsigned long val, void *v)
143 {
144 struct cfi_private *cfi = nettel_intel_map.fldrv_priv;
145 unsigned long b;
146
147 /* Make sure all FLASH chips are put back into read mode */
148 for (b = 0; (b < nettel_intel_partitions[3].size); b += 0x100000) {
149 cfi_send_gen_cmd(0xff, 0x55, b, &nettel_intel_map, cfi,
150 cfi->device_type, NULL);
151 }
152 return(NOTIFY_OK);
153 }
154
155 static struct notifier_block nettel_notifier_block = {
156 nettel_reboot_notifier, NULL, 0
157 };
158
159 #endif
160
161 /****************************************************************************/
162
nettel_init(void)163 static int __init nettel_init(void)
164 {
165 volatile unsigned long *amdpar;
166 unsigned long amdaddr, maxsize;
167 int num_amd_partitions=0;
168 #ifdef CONFIG_MTD_CFI_INTELEXT
169 volatile unsigned long *intel0par, *intel1par;
170 unsigned long orig_bootcspar, orig_romcs1par;
171 unsigned long intel0addr, intel0size;
172 unsigned long intel1addr, intel1size;
173 int intelboot, intel0cs, intel1cs;
174 int num_intel_partitions;
175 #endif
176 int rc = 0;
177
178 nettel_mmcrp = (void *) ioremap_nocache(0xfffef000, 4096);
179 if (nettel_mmcrp == NULL) {
180 printk("SNAPGEAR: failed to disable MMCR cache??\n");
181 return(-EIO);
182 }
183
184 /* Set CPU clock to be 33.000MHz */
185 *((unsigned char *) (nettel_mmcrp + 0xc64)) = 0x01;
186
187 amdpar = (volatile unsigned long *) (nettel_mmcrp + 0xc4);
188
189 #ifdef CONFIG_MTD_CFI_INTELEXT
190 intelboot = 0;
191 intel0cs = SC520_PAR_ROMCS1;
192 intel0par = (volatile unsigned long *) (nettel_mmcrp + 0xc0);
193 intel1cs = SC520_PAR_ROMCS2;
194 intel1par = (volatile unsigned long *) (nettel_mmcrp + 0xbc);
195
196 /*
197 * Save the CS settings then ensure ROMCS1 and ROMCS2 are off,
198 * otherwise they might clash with where we try to map BOOTCS.
199 */
200 orig_bootcspar = *amdpar;
201 orig_romcs1par = *intel0par;
202 *intel0par = 0;
203 *intel1par = 0;
204 #endif
205
206 /*
207 * The first thing to do is determine if we have a separate
208 * boot FLASH device. Typically this is a small (1 to 2MB)
209 * AMD FLASH part. It seems that device size is about the
210 * only way to tell if this is the case...
211 */
212 amdaddr = 0x20000000;
213 maxsize = AMD_WINDOW_MAXSIZE;
214
215 *amdpar = SC520_PAR(SC520_PAR_BOOTCS, amdaddr, maxsize);
216 __asm__ ("wbinvd");
217
218 nettel_amd_map.phys = amdaddr;
219 nettel_amd_map.virt = ioremap_nocache(amdaddr, maxsize);
220 if (!nettel_amd_map.virt) {
221 printk("SNAPGEAR: failed to ioremap() BOOTCS\n");
222 iounmap(nettel_mmcrp);
223 return(-EIO);
224 }
225 simple_map_init(&nettel_amd_map);
226
227 if ((amd_mtd = do_map_probe("jedec_probe", &nettel_amd_map))) {
228 printk(KERN_NOTICE "SNAPGEAR: AMD flash device size = %dK\n",
229 (int)(amd_mtd->size>>10));
230
231 amd_mtd->owner = THIS_MODULE;
232
233 /* The high BIOS partition is only present for 2MB units */
234 num_amd_partitions = NUM_AMD_PARTITIONS;
235 if (amd_mtd->size < AMD_WINDOW_MAXSIZE)
236 num_amd_partitions--;
237 /* Don't add the partition until after the primary INTEL's */
238
239 #ifdef CONFIG_MTD_CFI_INTELEXT
240 /*
241 * Map the Intel flash into memory after the AMD
242 * It has to start on a multiple of maxsize.
243 */
244 maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);
245 if (maxsize < (32 * 1024 * 1024))
246 maxsize = (32 * 1024 * 1024);
247 intel0addr = amdaddr + maxsize;
248 #endif
249 } else {
250 #ifdef CONFIG_MTD_CFI_INTELEXT
251 /* INTEL boot FLASH */
252 intelboot++;
253
254 if (!orig_romcs1par) {
255 intel0cs = SC520_PAR_BOOTCS;
256 intel0par = (volatile unsigned long *)
257 (nettel_mmcrp + 0xc4);
258 intel1cs = SC520_PAR_ROMCS1;
259 intel1par = (volatile unsigned long *)
260 (nettel_mmcrp + 0xc0);
261
262 intel0addr = SC520_PAR_TO_ADDR(orig_bootcspar);
263 maxsize = SC520_PAR_TO_SIZE(orig_bootcspar);
264 } else {
265 /* Kernel base is on ROMCS1, not BOOTCS */
266 intel0cs = SC520_PAR_ROMCS1;
267 intel0par = (volatile unsigned long *)
268 (nettel_mmcrp + 0xc0);
269 intel1cs = SC520_PAR_BOOTCS;
270 intel1par = (volatile unsigned long *)
271 (nettel_mmcrp + 0xc4);
272
273 intel0addr = SC520_PAR_TO_ADDR(orig_romcs1par);
274 maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);
275 }
276
277 /* Destroy useless AMD MTD mapping */
278 amd_mtd = NULL;
279 iounmap(nettel_amd_map.virt);
280 nettel_amd_map.virt = NULL;
281 #else
282 /* Only AMD flash supported */
283 rc = -ENXIO;
284 goto out_unmap2;
285 #endif
286 }
287
288 #ifdef CONFIG_MTD_CFI_INTELEXT
289 /*
290 * We have determined the INTEL FLASH configuration, so lets
291 * go ahead and probe for them now.
292 */
293
294 /* Set PAR to the maximum size */
295 if (maxsize < (32 * 1024 * 1024))
296 maxsize = (32 * 1024 * 1024);
297 *intel0par = SC520_PAR(intel0cs, intel0addr, maxsize);
298
299 /* Turn other PAR off so the first probe doesn't find it */
300 *intel1par = 0;
301
302 /* Probe for the size of the first Intel flash */
303 nettel_intel_map.size = maxsize;
304 nettel_intel_map.phys = intel0addr;
305 nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
306 if (!nettel_intel_map.virt) {
307 printk("SNAPGEAR: failed to ioremap() ROMCS1\n");
308 rc = -EIO;
309 goto out_unmap2;
310 }
311 simple_map_init(&nettel_intel_map);
312
313 intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
314 if (!intel_mtd) {
315 rc = -ENXIO;
316 goto out_unmap1;
317 }
318
319 /* Set PAR to the detected size */
320 intel0size = intel_mtd->size;
321 *intel0par = SC520_PAR(intel0cs, intel0addr, intel0size);
322
323 /*
324 * Map second Intel FLASH right after first. Set its size to the
325 * same maxsize used for the first Intel FLASH.
326 */
327 intel1addr = intel0addr + intel0size;
328 *intel1par = SC520_PAR(intel1cs, intel1addr, maxsize);
329 __asm__ ("wbinvd");
330
331 maxsize += intel0size;
332
333 /* Delete the old map and probe again to do both chips */
334 map_destroy(intel_mtd);
335 intel_mtd = NULL;
336 iounmap(nettel_intel_map.virt);
337
338 nettel_intel_map.size = maxsize;
339 nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
340 if (!nettel_intel_map.virt) {
341 printk("SNAPGEAR: failed to ioremap() ROMCS1/2\n");
342 rc = -EIO;
343 goto out_unmap2;
344 }
345
346 intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
347 if (! intel_mtd) {
348 rc = -ENXIO;
349 goto out_unmap1;
350 }
351
352 intel1size = intel_mtd->size - intel0size;
353 if (intel1size > 0) {
354 *intel1par = SC520_PAR(intel1cs, intel1addr, intel1size);
355 __asm__ ("wbinvd");
356 } else {
357 *intel1par = 0;
358 }
359
360 printk(KERN_NOTICE "SNAPGEAR: Intel flash device size = %lldKiB\n",
361 (unsigned long long)(intel_mtd->size >> 10));
362
363 intel_mtd->owner = THIS_MODULE;
364
365 num_intel_partitions = ARRAY_SIZE(nettel_intel_partitions);
366
367 if (intelboot) {
368 /*
369 * Adjust offset and size of last boot partition.
370 * Must allow for BIOS region at end of FLASH.
371 */
372 nettel_intel_partitions[1].size = (intel0size + intel1size) -
373 (1024*1024 + intel_mtd->erasesize);
374 nettel_intel_partitions[3].size = intel0size + intel1size;
375 nettel_intel_partitions[4].offset =
376 (intel0size + intel1size) - intel_mtd->erasesize;
377 nettel_intel_partitions[4].size = intel_mtd->erasesize;
378 nettel_intel_partitions[5].offset =
379 nettel_intel_partitions[4].offset;
380 nettel_intel_partitions[5].size =
381 nettel_intel_partitions[4].size;
382 } else {
383 /* No BIOS regions when AMD boot */
384 num_intel_partitions -= 2;
385 }
386 rc = mtd_device_register(intel_mtd, nettel_intel_partitions,
387 num_intel_partitions);
388 if (rc)
389 goto out_map_destroy;
390 #endif
391
392 if (amd_mtd) {
393 rc = mtd_device_register(amd_mtd, nettel_amd_partitions,
394 num_amd_partitions);
395 if (rc)
396 goto out_mtd_unreg;
397 }
398
399 #ifdef CONFIG_MTD_CFI_INTELEXT
400 register_reboot_notifier(&nettel_notifier_block);
401 #endif
402
403 return rc;
404
405 out_mtd_unreg:
406 #ifdef CONFIG_MTD_CFI_INTELEXT
407 mtd_device_unregister(intel_mtd);
408 out_map_destroy:
409 map_destroy(intel_mtd);
410 out_unmap1:
411 iounmap(nettel_intel_map.virt);
412 #endif
413
414 out_unmap2:
415 iounmap(nettel_mmcrp);
416 iounmap(nettel_amd_map.virt);
417
418 return rc;
419 }
420
421 /****************************************************************************/
422
nettel_cleanup(void)423 static void __exit nettel_cleanup(void)
424 {
425 #ifdef CONFIG_MTD_CFI_INTELEXT
426 unregister_reboot_notifier(&nettel_notifier_block);
427 #endif
428 if (amd_mtd) {
429 mtd_device_unregister(amd_mtd);
430 map_destroy(amd_mtd);
431 }
432 if (nettel_mmcrp) {
433 iounmap(nettel_mmcrp);
434 nettel_mmcrp = NULL;
435 }
436 if (nettel_amd_map.virt) {
437 iounmap(nettel_amd_map.virt);
438 nettel_amd_map.virt = NULL;
439 }
440 #ifdef CONFIG_MTD_CFI_INTELEXT
441 if (intel_mtd) {
442 mtd_device_unregister(intel_mtd);
443 map_destroy(intel_mtd);
444 }
445 if (nettel_intel_map.virt) {
446 iounmap(nettel_intel_map.virt);
447 nettel_intel_map.virt = NULL;
448 }
449 #endif
450 }
451
452 /****************************************************************************/
453
454 module_init(nettel_init);
455 module_exit(nettel_cleanup);
456
457 MODULE_LICENSE("GPL");
458 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
459 MODULE_DESCRIPTION("SnapGear/SecureEdge FLASH support");
460
461 /****************************************************************************/
462
