ia64/linux-2.6.18-xen.hg

view drivers/mtd/chips/cfi_probe.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
line source
1 /*
2 Common Flash Interface probe code.
3 (C) 2000 Red Hat. GPL'd.
4 $Id: cfi_probe.c,v 1.86 2005/11/29 14:48:31 gleixner Exp $
5 */
7 #include <linux/module.h>
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <asm/io.h>
12 #include <asm/byteorder.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/interrupt.h>
17 #include <linux/mtd/xip.h>
18 #include <linux/mtd/map.h>
19 #include <linux/mtd/cfi.h>
20 #include <linux/mtd/gen_probe.h>
22 //#define DEBUG_CFI
24 #ifdef DEBUG_CFI
25 static void print_cfi_ident(struct cfi_ident *);
26 #endif
28 static int cfi_probe_chip(struct map_info *map, __u32 base,
29 unsigned long *chip_map, struct cfi_private *cfi);
30 static int cfi_chip_setup(struct map_info *map, struct cfi_private *cfi);
32 struct mtd_info *cfi_probe(struct map_info *map);
34 #ifdef CONFIG_MTD_XIP
36 /* only needed for short periods, so this is rather simple */
37 #define xip_disable() local_irq_disable()
39 #define xip_allowed(base, map) \
40 do { \
41 (void) map_read(map, base); \
42 asm volatile (".rep 8; nop; .endr"); \
43 local_irq_enable(); \
44 } while (0)
46 #define xip_enable(base, map, cfi) \
47 do { \
48 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); \
49 cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL); \
50 xip_allowed(base, map); \
51 } while (0)
53 #define xip_disable_qry(base, map, cfi) \
54 do { \
55 xip_disable(); \
56 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); \
57 cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL); \
58 cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL); \
59 } while (0)
61 #else
63 #define xip_disable() do { } while (0)
64 #define xip_allowed(base, map) do { } while (0)
65 #define xip_enable(base, map, cfi) do { } while (0)
66 #define xip_disable_qry(base, map, cfi) do { } while (0)
68 #endif
70 /* check for QRY.
71 in: interleave,type,mode
72 ret: table index, <0 for error
73 */
74 static int __xipram qry_present(struct map_info *map, __u32 base,
75 struct cfi_private *cfi)
76 {
77 int osf = cfi->interleave * cfi->device_type; // scale factor
78 map_word val[3];
79 map_word qry[3];
81 qry[0] = cfi_build_cmd('Q', map, cfi);
82 qry[1] = cfi_build_cmd('R', map, cfi);
83 qry[2] = cfi_build_cmd('Y', map, cfi);
85 val[0] = map_read(map, base + osf*0x10);
86 val[1] = map_read(map, base + osf*0x11);
87 val[2] = map_read(map, base + osf*0x12);
89 if (!map_word_equal(map, qry[0], val[0]))
90 return 0;
92 if (!map_word_equal(map, qry[1], val[1]))
93 return 0;
95 if (!map_word_equal(map, qry[2], val[2]))
96 return 0;
98 return 1; // "QRY" found
99 }
101 static int __xipram cfi_probe_chip(struct map_info *map, __u32 base,
102 unsigned long *chip_map, struct cfi_private *cfi)
103 {
104 int i;
106 if ((base + 0) >= map->size) {
107 printk(KERN_NOTICE
108 "Probe at base[0x00](0x%08lx) past the end of the map(0x%08lx)\n",
109 (unsigned long)base, map->size -1);
110 return 0;
111 }
112 if ((base + 0xff) >= map->size) {
113 printk(KERN_NOTICE
114 "Probe at base[0x55](0x%08lx) past the end of the map(0x%08lx)\n",
115 (unsigned long)base + 0x55, map->size -1);
116 return 0;
117 }
119 xip_disable();
120 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
121 cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
122 cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
124 if (!qry_present(map,base,cfi)) {
125 xip_enable(base, map, cfi);
126 return 0;
127 }
129 if (!cfi->numchips) {
130 /* This is the first time we're called. Set up the CFI
131 stuff accordingly and return */
132 return cfi_chip_setup(map, cfi);
133 }
135 /* Check each previous chip to see if it's an alias */
136 for (i=0; i < (base >> cfi->chipshift); i++) {
137 unsigned long start;
138 if(!test_bit(i, chip_map)) {
139 /* Skip location; no valid chip at this address */
140 continue;
141 }
142 start = i << cfi->chipshift;
143 /* This chip should be in read mode if it's one
144 we've already touched. */
145 if (qry_present(map, start, cfi)) {
146 /* Eep. This chip also had the QRY marker.
147 * Is it an alias for the new one? */
148 cfi_send_gen_cmd(0xF0, 0, start, map, cfi, cfi->device_type, NULL);
149 cfi_send_gen_cmd(0xFF, 0, start, map, cfi, cfi->device_type, NULL);
151 /* If the QRY marker goes away, it's an alias */
152 if (!qry_present(map, start, cfi)) {
153 xip_allowed(base, map);
154 printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
155 map->name, base, start);
156 return 0;
157 }
158 /* Yes, it's actually got QRY for data. Most
159 * unfortunate. Stick the new chip in read mode
160 * too and if it's the same, assume it's an alias. */
161 /* FIXME: Use other modes to do a proper check */
162 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
163 cfi_send_gen_cmd(0xFF, 0, start, map, cfi, cfi->device_type, NULL);
165 if (qry_present(map, base, cfi)) {
166 xip_allowed(base, map);
167 printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
168 map->name, base, start);
169 return 0;
170 }
171 }
172 }
174 /* OK, if we got to here, then none of the previous chips appear to
175 be aliases for the current one. */
176 set_bit((base >> cfi->chipshift), chip_map); /* Update chip map */
177 cfi->numchips++;
179 /* Put it back into Read Mode */
180 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
181 cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
182 xip_allowed(base, map);
184 printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
185 map->name, cfi->interleave, cfi->device_type*8, base,
186 map->bankwidth*8);
188 return 1;
189 }
191 static int __xipram cfi_chip_setup(struct map_info *map,
192 struct cfi_private *cfi)
193 {
194 int ofs_factor = cfi->interleave*cfi->device_type;
195 __u32 base = 0;
196 int num_erase_regions = cfi_read_query(map, base + (0x10 + 28)*ofs_factor);
197 int i;
199 xip_enable(base, map, cfi);
200 #ifdef DEBUG_CFI
201 printk("Number of erase regions: %d\n", num_erase_regions);
202 #endif
203 if (!num_erase_regions)
204 return 0;
206 cfi->cfiq = kmalloc(sizeof(struct cfi_ident) + num_erase_regions * 4, GFP_KERNEL);
207 if (!cfi->cfiq) {
208 printk(KERN_WARNING "%s: kmalloc failed for CFI ident structure\n", map->name);
209 return 0;
210 }
212 memset(cfi->cfiq,0,sizeof(struct cfi_ident));
214 cfi->cfi_mode = CFI_MODE_CFI;
216 /* Read the CFI info structure */
217 xip_disable_qry(base, map, cfi);
218 for (i=0; i<(sizeof(struct cfi_ident) + num_erase_regions * 4); i++)
219 ((unsigned char *)cfi->cfiq)[i] = cfi_read_query(map,base + (0x10 + i)*ofs_factor);
221 /* Note we put the device back into Read Mode BEFORE going into Auto
222 * Select Mode, as some devices support nesting of modes, others
223 * don't. This way should always work.
224 * On cmdset 0001 the writes of 0xaa and 0x55 are not needed, and
225 * so should be treated as nops or illegal (and so put the device
226 * back into Read Mode, which is a nop in this case).
227 */
228 cfi_send_gen_cmd(0xf0, 0, base, map, cfi, cfi->device_type, NULL);
229 cfi_send_gen_cmd(0xaa, 0x555, base, map, cfi, cfi->device_type, NULL);
230 cfi_send_gen_cmd(0x55, 0x2aa, base, map, cfi, cfi->device_type, NULL);
231 cfi_send_gen_cmd(0x90, 0x555, base, map, cfi, cfi->device_type, NULL);
232 cfi->mfr = cfi_read_query16(map, base);
233 cfi->id = cfi_read_query16(map, base + ofs_factor);
235 /* Put it back into Read Mode */
236 cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
237 /* ... even if it's an Intel chip */
238 cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
239 xip_allowed(base, map);
241 /* Do any necessary byteswapping */
242 cfi->cfiq->P_ID = le16_to_cpu(cfi->cfiq->P_ID);
244 cfi->cfiq->P_ADR = le16_to_cpu(cfi->cfiq->P_ADR);
245 cfi->cfiq->A_ID = le16_to_cpu(cfi->cfiq->A_ID);
246 cfi->cfiq->A_ADR = le16_to_cpu(cfi->cfiq->A_ADR);
247 cfi->cfiq->InterfaceDesc = le16_to_cpu(cfi->cfiq->InterfaceDesc);
248 cfi->cfiq->MaxBufWriteSize = le16_to_cpu(cfi->cfiq->MaxBufWriteSize);
250 #ifdef DEBUG_CFI
251 /* Dump the information therein */
252 print_cfi_ident(cfi->cfiq);
253 #endif
255 for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
256 cfi->cfiq->EraseRegionInfo[i] = le32_to_cpu(cfi->cfiq->EraseRegionInfo[i]);
258 #ifdef DEBUG_CFI
259 printk(" Erase Region #%d: BlockSize 0x%4.4X bytes, %d blocks\n",
260 i, (cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff,
261 (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1);
262 #endif
263 }
265 printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
266 map->name, cfi->interleave, cfi->device_type*8, base,
267 map->bankwidth*8);
269 return 1;
270 }
272 #ifdef DEBUG_CFI
273 static char *vendorname(__u16 vendor)
274 {
275 switch (vendor) {
276 case P_ID_NONE:
277 return "None";
279 case P_ID_INTEL_EXT:
280 return "Intel/Sharp Extended";
282 case P_ID_AMD_STD:
283 return "AMD/Fujitsu Standard";
285 case P_ID_INTEL_STD:
286 return "Intel/Sharp Standard";
288 case P_ID_AMD_EXT:
289 return "AMD/Fujitsu Extended";
291 case P_ID_WINBOND:
292 return "Winbond Standard";
294 case P_ID_ST_ADV:
295 return "ST Advanced";
297 case P_ID_MITSUBISHI_STD:
298 return "Mitsubishi Standard";
300 case P_ID_MITSUBISHI_EXT:
301 return "Mitsubishi Extended";
303 case P_ID_SST_PAGE:
304 return "SST Page Write";
306 case P_ID_INTEL_PERFORMANCE:
307 return "Intel Performance Code";
309 case P_ID_INTEL_DATA:
310 return "Intel Data";
312 case P_ID_RESERVED:
313 return "Not Allowed / Reserved for Future Use";
315 default:
316 return "Unknown";
317 }
318 }
321 static void print_cfi_ident(struct cfi_ident *cfip)
322 {
323 #if 0
324 if (cfip->qry[0] != 'Q' || cfip->qry[1] != 'R' || cfip->qry[2] != 'Y') {
325 printk("Invalid CFI ident structure.\n");
326 return;
327 }
328 #endif
329 printk("Primary Vendor Command Set: %4.4X (%s)\n", cfip->P_ID, vendorname(cfip->P_ID));
330 if (cfip->P_ADR)
331 printk("Primary Algorithm Table at %4.4X\n", cfip->P_ADR);
332 else
333 printk("No Primary Algorithm Table\n");
335 printk("Alternative Vendor Command Set: %4.4X (%s)\n", cfip->A_ID, vendorname(cfip->A_ID));
336 if (cfip->A_ADR)
337 printk("Alternate Algorithm Table at %4.4X\n", cfip->A_ADR);
338 else
339 printk("No Alternate Algorithm Table\n");
342 printk("Vcc Minimum: %2d.%d V\n", cfip->VccMin >> 4, cfip->VccMin & 0xf);
343 printk("Vcc Maximum: %2d.%d V\n", cfip->VccMax >> 4, cfip->VccMax & 0xf);
344 if (cfip->VppMin) {
345 printk("Vpp Minimum: %2d.%d V\n", cfip->VppMin >> 4, cfip->VppMin & 0xf);
346 printk("Vpp Maximum: %2d.%d V\n", cfip->VppMax >> 4, cfip->VppMax & 0xf);
347 }
348 else
349 printk("No Vpp line\n");
351 printk("Typical byte/word write timeout: %d µs\n", 1<<cfip->WordWriteTimeoutTyp);
352 printk("Maximum byte/word write timeout: %d µs\n", (1<<cfip->WordWriteTimeoutMax) * (1<<cfip->WordWriteTimeoutTyp));
354 if (cfip->BufWriteTimeoutTyp || cfip->BufWriteTimeoutMax) {
355 printk("Typical full buffer write timeout: %d µs\n", 1<<cfip->BufWriteTimeoutTyp);
356 printk("Maximum full buffer write timeout: %d µs\n", (1<<cfip->BufWriteTimeoutMax) * (1<<cfip->BufWriteTimeoutTyp));
357 }
358 else
359 printk("Full buffer write not supported\n");
361 printk("Typical block erase timeout: %d ms\n", 1<<cfip->BlockEraseTimeoutTyp);
362 printk("Maximum block erase timeout: %d ms\n", (1<<cfip->BlockEraseTimeoutMax) * (1<<cfip->BlockEraseTimeoutTyp));
363 if (cfip->ChipEraseTimeoutTyp || cfip->ChipEraseTimeoutMax) {
364 printk("Typical chip erase timeout: %d ms\n", 1<<cfip->ChipEraseTimeoutTyp);
365 printk("Maximum chip erase timeout: %d ms\n", (1<<cfip->ChipEraseTimeoutMax) * (1<<cfip->ChipEraseTimeoutTyp));
366 }
367 else
368 printk("Chip erase not supported\n");
370 printk("Device size: 0x%X bytes (%d MiB)\n", 1 << cfip->DevSize, 1<< (cfip->DevSize - 20));
371 printk("Flash Device Interface description: 0x%4.4X\n", cfip->InterfaceDesc);
372 switch(cfip->InterfaceDesc) {
373 case 0:
374 printk(" - x8-only asynchronous interface\n");
375 break;
377 case 1:
378 printk(" - x16-only asynchronous interface\n");
379 break;
381 case 2:
382 printk(" - supports x8 and x16 via BYTE# with asynchronous interface\n");
383 break;
385 case 3:
386 printk(" - x32-only asynchronous interface\n");
387 break;
389 case 4:
390 printk(" - supports x16 and x32 via Word# with asynchronous interface\n");
391 break;
393 case 65535:
394 printk(" - Not Allowed / Reserved\n");
395 break;
397 default:
398 printk(" - Unknown\n");
399 break;
400 }
402 printk("Max. bytes in buffer write: 0x%x\n", 1<< cfip->MaxBufWriteSize);
403 printk("Number of Erase Block Regions: %d\n", cfip->NumEraseRegions);
405 }
406 #endif /* DEBUG_CFI */
408 static struct chip_probe cfi_chip_probe = {
409 .name = "CFI",
410 .probe_chip = cfi_probe_chip
411 };
413 struct mtd_info *cfi_probe(struct map_info *map)
414 {
415 /*
416 * Just use the generic probe stuff to call our CFI-specific
417 * chip_probe routine in all the possible permutations, etc.
418 */
419 return mtd_do_chip_probe(map, &cfi_chip_probe);
420 }
422 static struct mtd_chip_driver cfi_chipdrv = {
423 .probe = cfi_probe,
424 .name = "cfi_probe",
425 .module = THIS_MODULE
426 };
428 static int __init cfi_probe_init(void)
429 {
430 register_mtd_chip_driver(&cfi_chipdrv);
431 return 0;
432 }
434 static void __exit cfi_probe_exit(void)
435 {
436 unregister_mtd_chip_driver(&cfi_chipdrv);
437 }
439 module_init(cfi_probe_init);
440 module_exit(cfi_probe_exit);
442 MODULE_LICENSE("GPL");
443 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
444 MODULE_DESCRIPTION("Probe code for CFI-compliant flash chips");