/release/src-rt/linux/linux-2.6/drivers/mtd/chips/cfi_probe.c
C | 445 lines | 316 code | 86 blank | 43 comment | 37 complexity | 62b22373021535d88016060e8ad243ba MD5 | raw file
- /*
- Common Flash Interface probe code.
- (C) 2000 Red Hat. GPL'd.
- $Id: cfi_probe.c,v 1.86 2005/11/29 14:48:31 gleixner Exp $
- */
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <asm/io.h>
- #include <asm/byteorder.h>
- #include <linux/errno.h>
- #include <linux/slab.h>
- #include <linux/interrupt.h>
- #include <linux/mtd/xip.h>
- #include <linux/mtd/map.h>
- #include <linux/mtd/cfi.h>
- #include <linux/mtd/gen_probe.h>
- //#define DEBUG_CFI
- #ifdef DEBUG_CFI
- static void print_cfi_ident(struct cfi_ident *);
- #endif
- static int cfi_probe_chip(struct map_info *map, __u32 base,
- unsigned long *chip_map, struct cfi_private *cfi);
- static int cfi_chip_setup(struct map_info *map, struct cfi_private *cfi);
- struct mtd_info *cfi_probe(struct map_info *map);
- #ifdef CONFIG_MTD_XIP
- /* only needed for short periods, so this is rather simple */
- #define xip_disable() local_irq_disable()
- #define xip_allowed(base, map) \
- do { \
- (void) map_read(map, base); \
- asm volatile (".rep 8; nop; .endr"); \
- local_irq_enable(); \
- } while (0)
- #define xip_enable(base, map, cfi) \
- do { \
- cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); \
- cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL); \
- xip_allowed(base, map); \
- } while (0)
- #define xip_disable_qry(base, map, cfi) \
- do { \
- xip_disable(); \
- cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); \
- cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL); \
- cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL); \
- } while (0)
- #else
- #define xip_disable() do { } while (0)
- #define xip_allowed(base, map) do { } while (0)
- #define xip_enable(base, map, cfi) do { } while (0)
- #define xip_disable_qry(base, map, cfi) do { } while (0)
- #endif
- /* check for QRY.
- in: interleave,type,mode
- ret: table index, <0 for error
- */
- static int __xipram qry_present(struct map_info *map, __u32 base,
- struct cfi_private *cfi)
- {
- int osf = cfi->interleave * cfi->device_type; // scale factor
- map_word val[3];
- map_word qry[3];
- qry[0] = cfi_build_cmd('Q', map, cfi);
- qry[1] = cfi_build_cmd('R', map, cfi);
- qry[2] = cfi_build_cmd('Y', map, cfi);
- val[0] = map_read(map, base + osf*0x10);
- val[1] = map_read(map, base + osf*0x11);
- val[2] = map_read(map, base + osf*0x12);
- if (!map_word_equal(map, qry[0], val[0]))
- return 0;
- if (!map_word_equal(map, qry[1], val[1]))
- return 0;
- if (!map_word_equal(map, qry[2], val[2]))
- return 0;
- return 1; // "QRY" found
- }
- static int __xipram cfi_probe_chip(struct map_info *map, __u32 base,
- unsigned long *chip_map, struct cfi_private *cfi)
- {
- int i;
- if ((base + 0) >= map->size) {
- printk(KERN_NOTICE
- "Probe at base[0x00](0x%08lx) past the end of the map(0x%08lx)\n",
- (unsigned long)base, map->size -1);
- return 0;
- }
- if ((base + 0xff) >= map->size) {
- printk(KERN_NOTICE
- "Probe at base[0x55](0x%08lx) past the end of the map(0x%08lx)\n",
- (unsigned long)base + 0x55, map->size -1);
- return 0;
- }
- xip_disable();
- cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
- cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
- cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
- udelay(1);
- if (!qry_present(map,base,cfi)) {
- xip_enable(base, map, cfi);
- return 0;
- }
- if (!cfi->numchips) {
- /* This is the first time we're called. Set up the CFI
- stuff accordingly and return */
- return cfi_chip_setup(map, cfi);
- }
- /* Check each previous chip to see if it's an alias */
- for (i=0; i < (base >> cfi->chipshift); i++) {
- unsigned long start;
- if(!test_bit(i, chip_map)) {
- /* Skip location; no valid chip at this address */
- continue;
- }
- start = i << cfi->chipshift;
- /* This chip should be in read mode if it's one
- we've already touched. */
- if (qry_present(map, start, cfi)) {
- /* Eep. This chip also had the QRY marker.
- * Is it an alias for the new one? */
- cfi_send_gen_cmd(0xF0, 0, start, map, cfi, cfi->device_type, NULL);
- cfi_send_gen_cmd(0xFF, 0, start, map, cfi, cfi->device_type, NULL);
- /* If the QRY marker goes away, it's an alias */
- if (!qry_present(map, start, cfi)) {
- xip_allowed(base, map);
- printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
- map->name, base, start);
- return 0;
- }
- /* Yes, it's actually got QRY for data. Most
- * unfortunate. Stick the new chip in read mode
- * too and if it's the same, assume it's an alias. */
- /* FIXME: Use other modes to do a proper check */
- cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
- cfi_send_gen_cmd(0xFF, 0, start, map, cfi, cfi->device_type, NULL);
- if (qry_present(map, base, cfi)) {
- xip_allowed(base, map);
- printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
- map->name, base, start);
- return 0;
- }
- }
- }
- /* OK, if we got to here, then none of the previous chips appear to
- be aliases for the current one. */
- set_bit((base >> cfi->chipshift), chip_map); /* Update chip map */
- cfi->numchips++;
- /* Put it back into Read Mode */
- cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
- cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
- xip_allowed(base, map);
- printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
- map->name, cfi->interleave, cfi->device_type*8, base,
- map->bankwidth*8);
- return 1;
- }
- static int __xipram cfi_chip_setup(struct map_info *map,
- struct cfi_private *cfi)
- {
- int ofs_factor = cfi->interleave*cfi->device_type;
- __u32 base = 0;
- int num_erase_regions = cfi_read_query(map, base + (0x10 + 28)*ofs_factor);
- int i;
- xip_enable(base, map, cfi);
- #ifdef DEBUG_CFI
- printk("Number of erase regions: %d\n", num_erase_regions);
- #endif
- if (!num_erase_regions)
- return 0;
- cfi->cfiq = kmalloc(sizeof(struct cfi_ident) + num_erase_regions * 4, GFP_KERNEL);
- if (!cfi->cfiq) {
- printk(KERN_WARNING "%s: kmalloc failed for CFI ident structure\n", map->name);
- return 0;
- }
- memset(cfi->cfiq,0,sizeof(struct cfi_ident));
- cfi->cfi_mode = CFI_MODE_CFI;
- /* Read the CFI info structure */
- xip_disable_qry(base, map, cfi);
- for (i=0; i<(sizeof(struct cfi_ident) + num_erase_regions * 4); i++)
- ((unsigned char *)cfi->cfiq)[i] = cfi_read_query(map,base + (0x10 + i)*ofs_factor);
- /* Note we put the device back into Read Mode BEFORE going into Auto
- * Select Mode, as some devices support nesting of modes, others
- * don't. This way should always work.
- * On cmdset 0001 the writes of 0xaa and 0x55 are not needed, and
- * so should be treated as nops or illegal (and so put the device
- * back into Read Mode, which is a nop in this case).
- */
- cfi_send_gen_cmd(0xf0, 0, base, map, cfi, cfi->device_type, NULL);
- cfi_send_gen_cmd(0xaa, 0x555, base, map, cfi, cfi->device_type, NULL);
- cfi_send_gen_cmd(0x55, 0x2aa, base, map, cfi, cfi->device_type, NULL);
- cfi_send_gen_cmd(0x90, 0x555, base, map, cfi, cfi->device_type, NULL);
- cfi->mfr = cfi_read_query16(map, base);
- cfi->id = cfi_read_query16(map, base + ofs_factor);
- /* Put it back into Read Mode */
- cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
- /* ... even if it's an Intel chip */
- cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
- xip_allowed(base, map);
- /* Do any necessary byteswapping */
- cfi->cfiq->P_ID = le16_to_cpu(cfi->cfiq->P_ID);
- cfi->cfiq->P_ADR = le16_to_cpu(cfi->cfiq->P_ADR);
- cfi->cfiq->A_ID = le16_to_cpu(cfi->cfiq->A_ID);
- cfi->cfiq->A_ADR = le16_to_cpu(cfi->cfiq->A_ADR);
- cfi->cfiq->InterfaceDesc = le16_to_cpu(cfi->cfiq->InterfaceDesc);
- cfi->cfiq->MaxBufWriteSize = le16_to_cpu(cfi->cfiq->MaxBufWriteSize);
- #ifdef DEBUG_CFI
- /* Dump the information therein */
- print_cfi_ident(cfi->cfiq);
- #endif
- for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
- cfi->cfiq->EraseRegionInfo[i] = le32_to_cpu(cfi->cfiq->EraseRegionInfo[i]);
- #ifdef DEBUG_CFI
- printk(" Erase Region #%d: BlockSize 0x%4.4X bytes, %d blocks\n",
- i, (cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff,
- (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1);
- #endif
- }
- printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
- map->name, cfi->interleave, cfi->device_type*8, base,
- map->bankwidth*8);
- return 1;
- }
- #ifdef DEBUG_CFI
- static char *vendorname(__u16 vendor)
- {
- switch (vendor) {
- case P_ID_NONE:
- return "None";
- case P_ID_INTEL_EXT:
- return "Intel/Sharp Extended";
- case P_ID_AMD_STD:
- return "AMD/Fujitsu Standard";
- case P_ID_INTEL_STD:
- return "Intel/Sharp Standard";
- case P_ID_AMD_EXT:
- return "AMD/Fujitsu Extended";
- case P_ID_WINBOND:
- return "Winbond Standard";
- case P_ID_ST_ADV:
- return "ST Advanced";
- case P_ID_MITSUBISHI_STD:
- return "Mitsubishi Standard";
- case P_ID_MITSUBISHI_EXT:
- return "Mitsubishi Extended";
- case P_ID_SST_PAGE:
- return "SST Page Write";
- case P_ID_INTEL_PERFORMANCE:
- return "Intel Performance Code";
- case P_ID_INTEL_DATA:
- return "Intel Data";
- case P_ID_RESERVED:
- return "Not Allowed / Reserved for Future Use";
- default:
- return "Unknown";
- }
- }
- static void print_cfi_ident(struct cfi_ident *cfip)
- {
- #if 0
- if (cfip->qry[0] != 'Q' || cfip->qry[1] != 'R' || cfip->qry[2] != 'Y') {
- printk("Invalid CFI ident structure.\n");
- return;
- }
- #endif
- printk("Primary Vendor Command Set: %4.4X (%s)\n", cfip->P_ID, vendorname(cfip->P_ID));
- if (cfip->P_ADR)
- printk("Primary Algorithm Table at %4.4X\n", cfip->P_ADR);
- else
- printk("No Primary Algorithm Table\n");
- printk("Alternative Vendor Command Set: %4.4X (%s)\n", cfip->A_ID, vendorname(cfip->A_ID));
- if (cfip->A_ADR)
- printk("Alternate Algorithm Table at %4.4X\n", cfip->A_ADR);
- else
- printk("No Alternate Algorithm Table\n");
- printk("Vcc Minimum: %2d.%d V\n", cfip->VccMin >> 4, cfip->VccMin & 0xf);
- printk("Vcc Maximum: %2d.%d V\n", cfip->VccMax >> 4, cfip->VccMax & 0xf);
- if (cfip->VppMin) {
- printk("Vpp Minimum: %2d.%d V\n", cfip->VppMin >> 4, cfip->VppMin & 0xf);
- printk("Vpp Maximum: %2d.%d V\n", cfip->VppMax >> 4, cfip->VppMax & 0xf);
- }
- else
- printk("No Vpp line\n");
- printk("Typical byte/word write timeout: %d µs\n", 1<<cfip->WordWriteTimeoutTyp);
- printk("Maximum byte/word write timeout: %d µs\n", (1<<cfip->WordWriteTimeoutMax) * (1<<cfip->WordWriteTimeoutTyp));
- if (cfip->BufWriteTimeoutTyp || cfip->BufWriteTimeoutMax) {
- printk("Typical full buffer write timeout: %d µs\n", 1<<cfip->BufWriteTimeoutTyp);
- printk("Maximum full buffer write timeout: %d µs\n", (1<<cfip->BufWriteTimeoutMax) * (1<<cfip->BufWriteTimeoutTyp));
- }
- else
- printk("Full buffer write not supported\n");
- printk("Typical block erase timeout: %d ms\n", 1<<cfip->BlockEraseTimeoutTyp);
- printk("Maximum block erase timeout: %d ms\n", (1<<cfip->BlockEraseTimeoutMax) * (1<<cfip->BlockEraseTimeoutTyp));
- if (cfip->ChipEraseTimeoutTyp || cfip->ChipEraseTimeoutMax) {
- printk("Typical chip erase timeout: %d ms\n", 1<<cfip->ChipEraseTimeoutTyp);
- printk("Maximum chip erase timeout: %d ms\n", (1<<cfip->ChipEraseTimeoutMax) * (1<<cfip->ChipEraseTimeoutTyp));
- }
- else
- printk("Chip erase not supported\n");
- printk("Device size: 0x%X bytes (%d MiB)\n", 1 << cfip->DevSize, 1<< (cfip->DevSize - 20));
- printk("Flash Device Interface description: 0x%4.4X\n", cfip->InterfaceDesc);
- switch(cfip->InterfaceDesc) {
- case 0:
- printk(" - x8-only asynchronous interface\n");
- break;
- case 1:
- printk(" - x16-only asynchronous interface\n");
- break;
- case 2:
- printk(" - supports x8 and x16 via BYTE# with asynchronous interface\n");
- break;
- case 3:
- printk(" - x32-only asynchronous interface\n");
- break;
- case 4:
- printk(" - supports x16 and x32 via Word# with asynchronous interface\n");
- break;
- case 65535:
- printk(" - Not Allowed / Reserved\n");
- break;
- default:
- printk(" - Unknown\n");
- break;
- }
- printk("Max. bytes in buffer write: 0x%x\n", 1<< cfip->MaxBufWriteSize);
- printk("Number of Erase Block Regions: %d\n", cfip->NumEraseRegions);
- }
- #endif /* DEBUG_CFI */
- static struct chip_probe cfi_chip_probe = {
- .name = "CFI",
- .probe_chip = cfi_probe_chip
- };
- struct mtd_info *cfi_probe(struct map_info *map)
- {
- /*
- * Just use the generic probe stuff to call our CFI-specific
- * chip_probe routine in all the possible permutations, etc.
- */
- return mtd_do_chip_probe(map, &cfi_chip_probe);
- }
- static struct mtd_chip_driver cfi_chipdrv = {
- .probe = cfi_probe,
- .name = "cfi_probe",
- .module = THIS_MODULE
- };
- static int __init cfi_probe_init(void)
- {
- register_mtd_chip_driver(&cfi_chipdrv);
- return 0;
- }
- static void __exit cfi_probe_exit(void)
- {
- unregister_mtd_chip_driver(&cfi_chipdrv);
- }
- module_init(cfi_probe_init);
- module_exit(cfi_probe_exit);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
- MODULE_DESCRIPTION("Probe code for CFI-compliant flash chips");