/* * Common Flash Interface support: * AMD & Fujitsu Standard Vendor Command Set (ID 0x0002) * * Copyright (C) 2000 Crossnet Co. * Copyright (C) 2004 Arcom Control Systems Ltd * Copyright (C) 2005 MontaVista Software Inc. * * 2_by_8 routines added by Simon Munton * * 4_by_16 work by Carolyn J. Smith * * XIP support hooks by Vitaly Wool (based on code for Intel flash * by Nicolas Pitre) * * 25/09/2008 Christopher Moore: TopBottom fixup for many Macronix with CFI V1.0 * * Occasionally maintained by Thayne Harbaugh tharbaugh at lnxi dot com * * This code is GPL */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define AMD_BOOTLOC_BUG #define FORCE_WORD_WRITE 0 #define MAX_WORD_RETRIES 3 #define SST49LF004B 0x0060 #define SST49LF040B 0x0050 #define SST49LF008A 0x005a #define AT49BV6416 0x00d6 static int cfi_amdstd_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *); static int cfi_amdstd_write_words(struct mtd_info *, loff_t, size_t, size_t *, const u_char *); static int cfi_amdstd_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *); static int cfi_amdstd_erase_chip(struct mtd_info *, struct erase_info *); static int cfi_amdstd_erase_varsize(struct mtd_info *, struct erase_info *); static void cfi_amdstd_sync (struct mtd_info *); static int cfi_amdstd_suspend (struct mtd_info *); static void cfi_amdstd_resume (struct mtd_info *); static int cfi_amdstd_reboot(struct notifier_block *, unsigned long, void *); static int cfi_amdstd_secsi_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *); static void cfi_amdstd_destroy(struct mtd_info *); struct mtd_info *cfi_cmdset_0002(struct map_info *, int); static struct mtd_info *cfi_amdstd_setup (struct mtd_info *); static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode); static void put_chip(struct map_info *map, struct flchip *chip, unsigned long adr); #include "fwh_lock.h" static int cfi_atmel_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len); static int cfi_atmel_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len); static struct mtd_chip_driver cfi_amdstd_chipdrv = { .probe = NULL, /* Not usable directly */ .destroy = cfi_amdstd_destroy, .name = "cfi_cmdset_0002", .module = THIS_MODULE }; /* #define DEBUG_CFI_FEATURES */ #ifdef DEBUG_CFI_FEATURES static void cfi_tell_features(struct cfi_pri_amdstd *extp) { const char* erase_suspend[3] = { "Not supported", "Read only", "Read/write" }; const char* top_bottom[6] = { "No WP", "8x8KiB sectors at top & bottom, no WP", "Bottom boot", "Top boot", "Uniform, Bottom WP", "Uniform, Top WP" }; printk(" Silicon revision: %d\n", extp->SiliconRevision >> 1); printk(" Address sensitive unlock: %s\n", (extp->SiliconRevision & 1) ? "Not required" : "Required"); if (extp->EraseSuspend < ARRAY_SIZE(erase_suspend)) printk(" Erase Suspend: %s\n", erase_suspend[extp->EraseSuspend]); else printk(" Erase Suspend: Unknown value %d\n", extp->EraseSuspend); if (extp->BlkProt == 0) printk(" Block protection: Not supported\n"); else printk(" Block protection: %d sectors per group\n", extp->BlkProt); printk(" Temporary block unprotect: %s\n", extp->TmpBlkUnprotect ? "Supported" : "Not supported"); printk(" Block protect/unprotect scheme: %d\n", extp->BlkProtUnprot); printk(" Number of simultaneous operations: %d\n", extp->SimultaneousOps); printk(" Burst mode: %s\n", extp->BurstMode ? "Supported" : "Not supported"); if (extp->PageMode == 0) printk(" Page mode: Not supported\n"); else printk(" Page mode: %d word page\n", extp->PageMode << 2); printk(" Vpp Supply Minimum Program/Erase Voltage: %d.%d V\n", extp->VppMin >> 4, extp->VppMin & 0xf); printk(" Vpp Supply Maximum Program/Erase Voltage: %d.%d V\n", extp->VppMax >> 4, extp->VppMax & 0xf); if (extp->TopBottom < ARRAY_SIZE(top_bottom)) printk(" Top/Bottom Boot Block: %s\n", top_bottom[extp->TopBottom]); else printk(" Top/Bottom Boot Block: Unknown value %d\n", extp->TopBottom); } #endif #ifdef AMD_BOOTLOC_BUG /* Wheee. Bring me the head of someone at AMD. */ static void fixup_amd_bootblock(struct mtd_info *mtd, void* param) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; struct cfi_pri_amdstd *extp = cfi->cmdset_priv; __u8 major = extp->MajorVersion; __u8 minor = extp->MinorVersion; if (((major << 8) | minor) < 0x3131) { /* CFI version 1.0 => don't trust bootloc */ DEBUG(MTD_DEBUG_LEVEL1, "%s: JEDEC Vendor ID is 0x%02X Device ID is 0x%02X\n", map->name, cfi->mfr, cfi->id); /* AFAICS all 29LV400 with a bottom boot block have a device ID * of 0x22BA in 16-bit mode and 0xBA in 8-bit mode. * These were badly detected as they have the 0x80 bit set * so treat them as a special case. */ if (((cfi->id == 0xBA) || (cfi->id == 0x22BA)) && /* Macronix added CFI to their 2nd generation * MX29LV400C B/T but AFAICS no other 29LV400 (AMD, * Fujitsu, Spansion, EON, ESI and older Macronix) * has CFI. * * Therefore also check the manufacturer. * This reduces the risk of false detection due to * the 8-bit device ID. */ (cfi->mfr == CFI_MFR_MACRONIX)) { DEBUG(MTD_DEBUG_LEVEL1, "%s: Macronix MX29LV400C with bottom boot block" " detected\n", map->name); extp->TopBottom = 2; /* bottom boot */ } else if (cfi->id & 0x80) { printk(KERN_WARNING "%s: JEDEC Device ID is 0x%02X. Assuming broken CFI table.\n", map->name, cfi->id); extp->TopBottom = 3; /* top boot */ } else { extp->TopBottom = 2; /* bottom boot */ } DEBUG(MTD_DEBUG_LEVEL1, "%s: AMD CFI PRI V%c.%c has no boot block field;" " deduced %s from Device ID\n", map->name, major, minor, extp->TopBottom == 2 ? "bottom" : "top"); } } #endif static void fixup_use_write_buffers(struct mtd_info *mtd, void *param) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; if (cfi->cfiq->BufWriteTimeoutTyp) { DEBUG(MTD_DEBUG_LEVEL1, "Using buffer write method\n" ); mtd->write = cfi_amdstd_write_buffers; } } /* Atmel chips don't use the same PRI format as AMD chips */ static void fixup_convert_atmel_pri(struct mtd_info *mtd, void *param) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; struct cfi_pri_amdstd *extp = cfi->cmdset_priv; struct cfi_pri_atmel atmel_pri; memcpy(&atmel_pri, extp, sizeof(atmel_pri)); memset((char *)extp + 5, 0, sizeof(*extp) - 5); if (atmel_pri.Features & 0x02) extp->EraseSuspend = 2; /* Some chips got it backwards... */ if (cfi->id == AT49BV6416) { if (atmel_pri.BottomBoot) extp->TopBottom = 3; else extp->TopBottom = 2; } else { if (atmel_pri.BottomBoot) extp->TopBottom = 2; else extp->TopBottom = 3; } /* burst write mode not supported */ cfi->cfiq->BufWriteTimeoutTyp = 0; cfi->cfiq->BufWriteTimeoutMax = 0; } static void fixup_use_secsi(struct mtd_info *mtd, void *param) { /* Setup for chips with a secsi area */ mtd->read_user_prot_reg = cfi_amdstd_secsi_read; mtd->read_fact_prot_reg = cfi_amdstd_secsi_read; } static void fixup_use_erase_chip(struct mtd_info *mtd, void *param) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; if ((cfi->cfiq->NumEraseRegions == 1) && ((cfi->cfiq->EraseRegionInfo[0] & 0xffff) == 0)) { mtd->erase = cfi_amdstd_erase_chip; } } /* * Some Atmel chips (e.g. the AT49BV6416) power-up with all sectors * locked by default. */ static void fixup_use_atmel_lock(struct mtd_info *mtd, void *param) { mtd->lock = cfi_atmel_lock; mtd->unlock = cfi_atmel_unlock; mtd->flags |= MTD_POWERUP_LOCK; } static void fixup_s29gl064n_sectors(struct mtd_info *mtd, void *param) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; if ((cfi->cfiq->EraseRegionInfo[0] & 0xffff) == 0x003f) { cfi->cfiq->EraseRegionInfo[0] |= 0x0040; pr_warning("%s: Bad S29GL064N CFI data, adjust from 64 to 128 sectors\n", mtd->name); } } static void fixup_s29gl032n_sectors(struct mtd_info *mtd, void *param) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; if ((cfi->cfiq->EraseRegionInfo[1] & 0xffff) == 0x007e) { cfi->cfiq->EraseRegionInfo[1] &= ~0x0040; pr_warning("%s: Bad S29GL032N CFI data, adjust from 127 to 63 sectors\n", mtd->name); } } static struct cfi_fixup cfi_fixup_table[] = { { CFI_MFR_ATMEL, CFI_ID_ANY, fixup_convert_atmel_pri, NULL }, #ifdef AMD_BOOTLOC_BUG { CFI_MFR_AMD, CFI_ID_ANY, fixup_amd_bootblock, NULL }, { CFI_MFR_MACRONIX, CFI_ID_ANY, fixup_amd_bootblock, NULL }, #endif { CFI_MFR_AMD, 0x0050, fixup_use_secsi, NULL, }, { CFI_MFR_AMD, 0x0053, fixup_use_secsi, NULL, }, { CFI_MFR_AMD, 0x0055, fixup_use_secsi, NULL, }, { CFI_MFR_AMD, 0x0056, fixup_use_secsi, NULL, }, { CFI_MFR_AMD, 0x005C, fixup_use_secsi, NULL, }, { CFI_MFR_AMD, 0x005F, fixup_use_secsi, NULL, }, { CFI_MFR_AMD, 0x0c01, fixup_s29gl064n_sectors, NULL, }, { CFI_MFR_AMD, 0x1301, fixup_s29gl064n_sectors, NULL, }, { CFI_MFR_AMD, 0x1a00, fixup_s29gl032n_sectors, NULL, }, { CFI_MFR_AMD, 0x1a01, fixup_s29gl032n_sectors, NULL, }, #if !FORCE_WORD_WRITE { CFI_MFR_ANY, CFI_ID_ANY, fixup_use_write_buffers, NULL, }, #endif { 0, 0, NULL, NULL } }; static struct cfi_fixup jedec_fixup_table[] = { { CFI_MFR_SST, SST49LF004B, fixup_use_fwh_lock, NULL, }, { CFI_MFR_SST, SST49LF040B, fixup_use_fwh_lock, NULL, }, { CFI_MFR_SST, SST49LF008A, fixup_use_fwh_lock, NULL, }, { 0, 0, NULL, NULL } }; static struct cfi_fixup fixup_table[] = { /* The CFI vendor ids and the JEDEC vendor IDs appear * to be common. It is like the devices id's are as * well. This table is to pick all cases where * we know that is the case. */ { CFI_MFR_ANY, CFI_ID_ANY, fixup_use_erase_chip, NULL }, { CFI_MFR_ATMEL, AT49BV6416, fixup_use_atmel_lock, NULL }, { 0, 0, NULL, NULL } }; static void cfi_fixup_major_minor(struct cfi_private *cfi, struct cfi_pri_amdstd *extp) { if (cfi->mfr == CFI_MFR_SAMSUNG && cfi->id == 0x257e && extp->MajorVersion == '0') extp->MajorVersion = '1'; } struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary) { struct cfi_private *cfi = map->fldrv_priv; struct mtd_info *mtd; int i; mtd = kzalloc(sizeof(*mtd), GFP_KERNEL); if (!mtd) { printk(KERN_WARNING "Failed to allocate memory for MTD device\n"); return NULL; } mtd->priv = map; mtd->type = MTD_NORFLASH; /* Fill in the default mtd operations */ mtd->erase = cfi_amdstd_erase_varsize; mtd->write = cfi_amdstd_write_words; mtd->read = cfi_amdstd_read; mtd->sync = cfi_amdstd_sync; mtd->suspend = cfi_amdstd_suspend; mtd->resume = cfi_amdstd_resume; mtd->flags = MTD_CAP_NORFLASH; mtd->name = map->name; mtd->writesize = 1; mtd->reboot_notifier.notifier_call = cfi_amdstd_reboot; if (cfi->cfi_mode==CFI_MODE_CFI){ unsigned char bootloc; /* * It's a real CFI chip, not one for which the probe * routine faked a CFI structure. So we read the feature * table from it. */ __u16 adr = primary?cfi->cfiq->P_ADR:cfi->cfiq->A_ADR; struct cfi_pri_amdstd *extp; extp = (struct cfi_pri_amdstd*)cfi_read_pri(map, adr, sizeof(*extp), "Amd/Fujitsu"); if (!extp) { kfree(mtd); return NULL; } cfi_fixup_major_minor(cfi, extp); if (extp->MajorVersion != '1' || (extp->MinorVersion < '0' || extp->MinorVersion > '4')) { printk(KERN_ERR " Unknown Amd/Fujitsu Extended Query " "version %c.%c.\n", extp->MajorVersion, extp->MinorVersion); kfree(extp); kfree(mtd); return NULL; } /* Install our own private info structure */ cfi->cmdset_priv = extp; /* Apply cfi device specific fixups */ cfi_fixup(mtd, cfi_fixup_table); #ifdef DEBUG_CFI_FEATURES /* Tell the user about it in lots of lovely detail */ cfi_tell_features(extp); #endif bootloc = extp->TopBottom; if ((bootloc != 2) && (bootloc != 3)) { printk(KERN_WARNING "%s: CFI does not contain boot " "bank location. Assuming top.\n", map->name); bootloc = 2; } if (bootloc == 3 && cfi->cfiq->NumEraseRegions > 1) { printk(KERN_WARNING "%s: Swapping erase regions for broken CFI table.\n", map->name); for (i=0; icfiq->NumEraseRegions / 2; i++) { int j = (cfi->cfiq->NumEraseRegions-1)-i; __u32 swap; swap = cfi->cfiq->EraseRegionInfo[i]; cfi->cfiq->EraseRegionInfo[i] = cfi->cfiq->EraseRegionInfo[j]; cfi->cfiq->EraseRegionInfo[j] = swap; } } /* Set the default CFI lock/unlock addresses */ cfi->addr_unlock1 = 0x555; cfi->addr_unlock2 = 0x2aa; } /* CFI mode */ else if (cfi->cfi_mode == CFI_MODE_JEDEC) { /* Apply jedec specific fixups */ cfi_fixup(mtd, jedec_fixup_table); } /* Apply generic fixups */ cfi_fixup(mtd, fixup_table); for (i=0; i< cfi->numchips; i++) { cfi->chips[i].word_write_time = 1<cfiq->WordWriteTimeoutTyp; cfi->chips[i].buffer_write_time = 1<cfiq->BufWriteTimeoutTyp; cfi->chips[i].erase_time = 1<cfiq->BlockEraseTimeoutTyp; cfi->chips[i].ref_point_counter = 0; init_waitqueue_head(&(cfi->chips[i].wq)); } map->fldrv = &cfi_amdstd_chipdrv; return cfi_amdstd_setup(mtd); } EXPORT_SYMBOL_GPL(cfi_cmdset_0002); static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; unsigned long devsize = (1<cfiq->DevSize) * cfi->interleave; unsigned long offset = 0; int i,j; printk(KERN_NOTICE "number of %s chips: %d\n", (cfi->cfi_mode == CFI_MODE_CFI)?"CFI":"JEDEC",cfi->numchips); /* Select the correct geometry setup */ mtd->size = devsize * cfi->numchips; mtd->numeraseregions = cfi->cfiq->NumEraseRegions * cfi->numchips; mtd->eraseregions = kmalloc(sizeof(struct mtd_erase_region_info) * mtd->numeraseregions, GFP_KERNEL); if (!mtd->eraseregions) { printk(KERN_WARNING "Failed to allocate memory for MTD erase region info\n"); goto setup_err; } for (i=0; icfiq->NumEraseRegions; i++) { unsigned long ernum, ersize; ersize = ((cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff) * cfi->interleave; ernum = (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1; if (mtd->erasesize < ersize) { mtd->erasesize = ersize; } for (j=0; jnumchips; j++) { mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].offset = (j*devsize)+offset; mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].erasesize = ersize; mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].numblocks = ernum; } offset += (ersize * ernum); } if (offset != devsize) { /* Argh */ printk(KERN_WARNING "Sum of regions (%lx) != total size of set of interleaved chips (%lx)\n", offset, devsize); goto setup_err; } #if 0 // debug for (i=0; inumeraseregions;i++){ printk("%d: offset=0x%x,size=0x%x,blocks=%d\n", i,mtd->eraseregions[i].offset, mtd->eraseregions[i].erasesize, mtd->eraseregions[i].numblocks); } #endif __module_get(THIS_MODULE); register_reboot_notifier(&mtd->reboot_notifier); return mtd; setup_err: kfree(mtd->eraseregions); kfree(mtd); kfree(cfi->cmdset_priv); kfree(cfi->cfiq); return NULL; } /* * Return true if the chip is ready. * * Ready is one of: read mode, query mode, erase-suspend-read mode (in any * non-suspended sector) and is indicated by no toggle bits toggling. * * Note that anything more complicated than checking if no bits are toggling * (including checking DQ5 for an error status) is tricky to get working * correctly and is therefore not done (particulary with interleaved chips * as each chip must be checked independantly of the others). */ static int __xipram chip_ready(struct map_info *map, unsigned long addr) { map_word d, t; d = map_read(map, addr); t = map_read(map, addr); return map_word_equal(map, d, t); } /* * Return true if the chip is ready and has the correct value. * * Ready is one of: read mode, query mode, erase-suspend-read mode (in any * non-suspended sector) and it is indicated by no bits toggling. * * Error are indicated by toggling bits or bits held with the wrong value, * or with bits toggling. * * Note that anything more complicated than checking if no bits are toggling * (including checking DQ5 for an error status) is tricky to get working * correctly and is therefore not done (particulary with interleaved chips * as each chip must be checked independantly of the others). * */ static int __xipram chip_good(struct map_info *map, unsigned long addr, map_word expected) { map_word oldd, curd; oldd = map_read(map, addr); curd = map_read(map, addr); return map_word_equal(map, oldd, curd) && map_word_equal(map, curd, expected); } static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode) { DECLARE_WAITQUEUE(wait, current); struct cfi_private *cfi = map->fldrv_priv; unsigned long timeo; struct cfi_pri_amdstd *cfip = (struct cfi_pri_amdstd *)cfi->cmdset_priv; resettime: timeo = jiffies + HZ; retry: switch (chip->state) { case FL_STATUS: for (;;) { if (chip_ready(map, adr)) break; if (time_after(jiffies, timeo)) { printk(KERN_ERR "Waiting for chip to be ready timed out.\n"); return -EIO; } mutex_unlock(&chip->mutex); cfi_udelay(1); mutex_lock(&chip->mutex); /* Someone else might have been playing with it. */ goto retry; } case FL_READY: case FL_CFI_QUERY: case FL_JEDEC_QUERY: return 0; case FL_ERASING: if (!cfip || !(cfip->EraseSuspend & (0x1|0x2)) || !(mode == FL_READY || mode == FL_POINT || (mode == FL_WRITING && (cfip->EraseSuspend & 0x2)))) goto sleep; /* We could check to see if we're trying to access the sector * that is currently being erased. However, no user will try * anything like that so we just wait for the timeout. */ /* Erase suspend */ /* It's harmless to issue the Erase-Suspend and Erase-Resume * commands when the erase algorithm isn't in progress. */ map_write(map, CMD(0xB0), chip->in_progress_block_addr); chip->oldstate = FL_ERASING; chip->state = FL_ERASE_SUSPENDING; chip->erase_suspended = 1; for (;;) { if (chip_ready(map, adr)) break; if (time_after(jiffies, timeo)) { /* Should have suspended the erase by now. * Send an Erase-Resume command as either * there was an error (so leave the erase * routine to recover from it) or we trying to * use the erase-in-progress sector. */ map_write(map, CMD(0x30), chip->in_progress_block_addr); chip->state = FL_ERASING; chip->oldstate = FL_READY; printk(KERN_ERR "MTD %s(): chip not ready after erase suspend\n", __func__); return -EIO; } mutex_unlock(&chip->mutex); cfi_udelay(1); mutex_lock(&chip->mutex); /* Nobody will touch it while it's in state FL_ERASE_SUSPENDING. So we can just loop here. */ } chip->state = FL_READY; return 0; case FL_XIP_WHILE_ERASING: if (mode != FL_READY && mode != FL_POINT && (!cfip || !(cfip->EraseSuspend&2))) goto sleep; chip->oldstate = chip->state; chip->state = FL_READY; return 0; case FL_SHUTDOWN: /* The machine is rebooting */ return -EIO; case FL_POINT: /* Only if there's no operation suspended... */ if (mode == FL_READY && chip->oldstate == FL_READY) return 0; default: sleep: set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&chip->wq, &wait); mutex_unlock(&chip->mutex); schedule(); remove_wait_queue(&chip->wq, &wait); mutex_lock(&chip->mutex); goto resettime; } } static void put_chip(struct map_info *map, struct flchip *chip, unsigned long adr) { struct cfi_private *cfi = map->fldrv_priv; switch(chip->oldstate) { case FL_ERASING: chip->state = chip->oldstate; map_write(map, CMD(0x30), chip->in_progress_block_addr); chip->oldstate = FL_READY; chip->state = FL_ERASING; break; case FL_XIP_WHILE_ERASING: chip->state = chip->oldstate; chip->oldstate = FL_READY; break; case FL_READY: case FL_STATUS: /* We should really make set_vpp() count, rather than doing this */ DISABLE_VPP(map); break; default: printk(KERN_ERR "MTD: put_chip() called with oldstate %d!!\n", chip->oldstate); } wake_up(&chip->wq); } #ifdef CONFIG_MTD_XIP /* * No interrupt what so ever can be serviced while the flash isn't in array * mode. This is ensured by the xip_disable() and xip_enable() functions * enclosing any code path where the flash is known not to be in array mode. * And within a XIP disabled code path, only functions marked with __xipram * may be called and nothing else (it's a good thing to inspect generated * assembly to make sure inline functions were actually inlined and that gcc * didn't emit calls to its own support functions). Also configuring MTD CFI * support to a single buswidth and a single interleave is also recommended. */ static void xip_disable(struct map_info *map, struct flchip *chip, unsigned long adr) { /* TODO: chips with no XIP use should ignore and return */ (void) map_read(map, adr); /* ensure mmu mapping is up to date */ local_irq_disable(); } static void __xipram xip_enable(struct map_info *map, struct flchip *chip, unsigned long adr) { struct cfi_private *cfi = map->fldrv_priv; if (chip->state != FL_POINT && chip->state != FL_READY) { map_write(map, CMD(0xf0), adr); chip->state = FL_READY; } (void) map_read(map, adr); xip_iprefetch(); local_irq_enable(); } /* * When a delay is required for the flash operation to complete, the * xip_udelay() function is polling for both the given timeout and pending * (but still masked) hardware interrupts. Whenever there is an interrupt * pending then the flash erase operation is suspended, array mode restored * and interrupts unmasked. Task scheduling might also happen at that * point. The CPU eventually returns from the interrupt or the call to * schedule() and the suspended flash operation is resumed for the remaining * of the delay period. * * Warning: this function _will_ fool interrupt latency tracing tools. */ static void __xipram xip_udelay(struct map_info *map, struct flchip *chip, unsigned long adr, int usec) { struct cfi_private *cfi = map->fldrv_priv; struct cfi_pri_amdstd *extp = cfi->cmdset_priv; map_word status, OK = CMD(0x80); unsigned long suspended, start = xip_currtime(); flstate_t oldstate; do { cpu_relax(); if (xip_irqpending() && extp && ((chip->state == FL_ERASING && (extp->EraseSuspend & 2))) && (cfi_interleave_is_1(cfi) || chip->oldstate == FL_READY)) { /* * Let's suspend the erase operation when supported. * Note that we currently don't try to suspend * interleaved chips if there is already another * operation suspended (imagine what happens * when one chip was already done with the current * operation while another chip suspended it, then * we resume the whole thing at once). Yes, it * can happen! */ map_write(map, CMD(0xb0), adr); usec -= xip_elapsed_since(start); suspended = xip_currtime(); do { if (xip_elapsed_since(suspended) > 100000) { /* * The chip doesn't want to suspend * after waiting for 100 msecs. * This is a critical error but there * is not much we can do here. */ return; } status = map_read(map, adr); } while (!map_word_andequal(map, status, OK, OK)); /* Suspend succeeded */ oldstate = chip->state; if (!map_word_bitsset(map, status, CMD(0x40))) break; chip->state = FL_XIP_WHILE_ERASING; chip->erase_suspended = 1; map_write(map, CMD(0xf0), adr); (void) map_read(map, adr); xip_iprefetch(); local_irq_enable(); mutex_unlock(&chip->mutex); xip_iprefetch(); cond_resched(); /* * We're back. However someone else might have * decided to go write to the chip if we are in * a suspended erase state. If so let's wait * until it's done. */ mutex_lock(&chip->mutex); while (chip->state != FL_XIP_WHILE_ERASING) { DECLARE_WAITQUEUE(wait, current); set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&chip->wq, &wait); mutex_unlock(&chip->mutex); schedule(); remove_wait_queue(&chip->wq, &wait); mutex_lock(&chip->mutex); } /* Disallow XIP again */ local_irq_disable(); /* Resume the write or erase operation */ map_write(map, CMD(0x30), adr); chip->state = oldstate; start = xip_currtime(); } else if (usec >= 1000000/HZ) { /* * Try to save on CPU power when waiting delay * is at least a system timer tick period. * No need to be extremely accurate here. */ xip_cpu_idle(); } status = map_read(map, adr); } while (!map_word_andequal(map, status, OK, OK) && xip_elapsed_since(start) < usec); } #define UDELAY(map, chip, adr, usec) xip_udelay(map, chip, adr, usec) /* * The INVALIDATE_CACHED_RANGE() macro is normally used in parallel while * the flash is actively programming or erasing since we have to poll for * the operation to complete anyway. We can't do that in a generic way with * a XIP setup so do it before the actual flash operation in this case * and stub it out from INVALIDATE_CACHE_UDELAY. */ #define XIP_INVAL_CACHED_RANGE(map, from, size) \ INVALIDATE_CACHED_RANGE(map, from, size) #define INVALIDATE_CACHE_UDELAY(map, chip, adr, len, usec) \ UDELAY(map, chip, adr, usec) /* * Extra notes: * * Activating this XIP support changes the way the code works a bit. For * example the code to suspend the current process when concurrent access * happens is never executed because xip_udelay() will always return with the * same chip state as it was entered with. This is why there is no care for * the presence of add_wait_queue() or schedule() calls from within a couple * xip_disable()'d areas of code, like in do_erase_oneblock for example. * The queueing and scheduling are always happening within xip_udelay(). * * Similarly, get_chip() and put_chip() just happen to always be executed * with chip->state set to FL_READY (or FL_XIP_WHILE_*) where flash state * is in array mode, therefore never executing many cases therein and not * causing any problem with XIP. */ #else #define xip_disable(map, chip, adr) #define xip_enable(map, chip, adr) #define XIP_INVAL_CACHED_RANGE(x...) #define UDELAY(map, chip, adr, usec) \ do { \ mutex_unlock(&chip->mutex); \ cfi_udelay(usec); \ mutex_lock(&chip->mutex); \ } while (0) #define INVALIDATE_CACHE_UDELAY(map, chip, adr, len, usec) \ do { \ mutex_unlock(&chip->mutex); \ INVALIDATE_CACHED_RANGE(map, adr, len); \ cfi_udelay(usec); \ mutex_lock(&chip->mutex); \ } while (0) #endif static inline int do_read_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf) { unsigned long cmd_addr; struct cfi_private *cfi = map->fldrv_priv; int ret; adr += chip->start; /* Ensure cmd read/writes are aligned. */ cmd_addr = adr & ~(map_bankwidth(map)-1); mutex_lock(&chip->mutex); ret = get_chip(map, chip, cmd_addr, FL_READY); if (ret) { mutex_unlock(&chip->mutex); return ret; } if (chip->state != FL_POINT && chip->state != FL_READY) { map_write(map, CMD(0xf0), cmd_addr); chip->state = FL_READY; } map_copy_from(map, buf, adr, len); put_chip(map, chip, cmd_addr); mutex_unlock(&chip->mutex); return 0; } static int cfi_amdstd_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; unsigned long ofs; int chipnum; int ret = 0; /* ofs: offset within the first chip that the first read should start */ chipnum = (from >> cfi->chipshift); ofs = from - (chipnum << cfi->chipshift); *retlen = 0; while (len) { unsigned long thislen; if (chipnum >= cfi->numchips) break; if ((len + ofs -1) >> cfi->chipshift) thislen = (1<chipshift) - ofs; else thislen = len; ret = do_read_onechip(map, &cfi->chips[chipnum], ofs, thislen, buf); if (ret) break; *retlen += thislen; len -= thislen; buf += thislen; ofs = 0; chipnum++; } return ret; } static inline int do_read_secsi_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf) { DECLARE_WAITQUEUE(wait, current); unsigned long timeo = jiffies + HZ; struct cfi_private *cfi = map->fldrv_priv; retry: mutex_lock(&chip->mutex); if (chip->state != FL_READY){ #if 0 printk(KERN_DEBUG "Waiting for chip to read, status = %d\n", chip->state); #endif set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&chip->wq, &wait); mutex_unlock(&chip->mutex); schedule(); remove_wait_queue(&chip->wq, &wait); #if 0 if(signal_pending(current)) return -EINTR; #endif timeo = jiffies + HZ; goto retry; } adr += chip->start; chip->state = FL_READY; cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x88, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); map_copy_from(map, buf, adr, len); cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x90, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x00, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); wake_up(&chip->wq); mutex_unlock(&chip->mutex); return 0; } static int cfi_amdstd_secsi_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; unsigned long ofs; int chipnum; int ret = 0; /* ofs: offset within the first chip that the first read should start */ /* 8 secsi bytes per chip */ chipnum=from>>3; ofs=from & 7; *retlen = 0; while (len) { unsigned long thislen; if (chipnum >= cfi->numchips) break; if ((len + ofs -1) >> 3) thislen = (1<<3) - ofs; else thislen = len; ret = do_read_secsi_onechip(map, &cfi->chips[chipnum], ofs, thislen, buf); if (ret) break; *retlen += thislen; len -= thislen; buf += thislen; ofs = 0; chipnum++; } return ret; } static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip, unsigned long adr, map_word datum) { struct cfi_private *cfi = map->fldrv_priv; unsigned long timeo = jiffies + HZ; /* * We use a 1ms + 1 jiffies generic timeout for writes (most devices * have a max write time of a few hundreds usec). However, we should * use the maximum timeout value given by the chip at probe time * instead. Unfortunately, struct flchip does have a field for * maximum timeout, only for typical which can be far too short * depending of the conditions. The ' + 1' is to avoid having a * timeout of 0 jiffies if HZ is smaller than 1000. */ unsigned long uWriteTimeout = ( HZ / 1000 ) + 1; int ret = 0; map_word oldd; int retry_cnt = 0; adr += chip->start; mutex_lock(&chip->mutex); ret = get_chip(map, chip, adr, FL_WRITING); if (ret) { mutex_unlock(&chip->mutex); return ret; } DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n", __func__, adr, datum.x[0] ); /* * Check for a NOP for the case when the datum to write is already * present - it saves time and works around buggy chips that corrupt * data at other locations when 0xff is written to a location that * already contains 0xff. */ oldd = map_read(map, adr); if (map_word_equal(map, oldd, datum)) { DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): NOP\n", __func__); goto op_done; } XIP_INVAL_CACHED_RANGE(map, adr, map_bankwidth(map)); ENABLE_VPP(map); xip_disable(map, chip, adr); retry: cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0xA0, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); map_write(map, datum, adr); chip->state = FL_WRITING; INVALIDATE_CACHE_UDELAY(map, chip, adr, map_bankwidth(map), chip->word_write_time); /* See comment above for timeout value. */ timeo = jiffies + uWriteTimeout; for (;;) { if (chip->state != FL_WRITING) { /* Someone's suspended the write. Sleep */ DECLARE_WAITQUEUE(wait, current); set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&chip->wq, &wait); mutex_unlock(&chip->mutex); schedule(); remove_wait_queue(&chip->wq, &wait); timeo = jiffies + (HZ / 2); /* FIXME */ mutex_lock(&chip->mutex); continue; } if (time_after(jiffies, timeo) && !chip_ready(map, adr)){ xip_enable(map, chip, adr); printk(KERN_WARNING "MTD %s(): software timeout\n", __func__); xip_disable(map, chip, adr); break; } if (chip_ready(map, adr)) break; /* Latency issues. Drop the lock, wait a while and retry */ UDELAY(map, chip, adr, 1); } /* Did we succeed? */ if (!chip_good(map, adr, datum)) { /* reset on all failures. */ map_write( map, CMD(0xF0), chip->start ); /* FIXME - should have reset delay before continuing */ if (++retry_cnt <= MAX_WORD_RETRIES) goto retry; ret = -EIO; } xip_enable(map, chip, adr); op_done: chip->state = FL_READY; put_chip(map, chip, adr); mutex_unlock(&chip->mutex); return ret; } static int cfi_amdstd_write_words(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; int ret = 0; int chipnum; unsigned long ofs, chipstart; DECLARE_WAITQUEUE(wait, current); *retlen = 0; if (!len) return 0; chipnum = to >> cfi->chipshift; ofs = to - (chipnum << cfi->chipshift); chipstart = cfi->chips[chipnum].start; /* If it's not bus-aligned, do the first byte write */ if (ofs & (map_bankwidth(map)-1)) { unsigned long bus_ofs = ofs & ~(map_bankwidth(map)-1); int i = ofs - bus_ofs; int n = 0; map_word tmp_buf; retry: mutex_lock(&cfi->chips[chipnum].mutex); if (cfi->chips[chipnum].state != FL_READY) { #if 0 printk(KERN_DEBUG "Waiting for chip to write, status = %d\n", cfi->chips[chipnum].state); #endif set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&cfi->chips[chipnum].wq, &wait); mutex_unlock(&cfi->chips[chipnum].mutex); schedule(); remove_wait_queue(&cfi->chips[chipnum].wq, &wait); #if 0 if(signal_pending(current)) return -EINTR; #endif goto retry; } /* Load 'tmp_buf' with old contents of flash */ tmp_buf = map_read(map, bus_ofs+chipstart); mutex_unlock(&cfi->chips[chipnum].mutex); /* Number of bytes to copy from buffer */ n = min_t(int, len, map_bankwidth(map)-i); tmp_buf = map_word_load_partial(map, tmp_buf, buf, i, n); ret = do_write_oneword(map, &cfi->chips[chipnum], bus_ofs, tmp_buf); if (ret) return ret; ofs += n; buf += n; (*retlen) += n; len -= n; if (ofs >> cfi->chipshift) { chipnum ++; ofs = 0; if (chipnum == cfi->numchips) return 0; } } /* We are now aligned, write as much as possible */ while(len >= map_bankwidth(map)) { map_word datum; datum = map_word_load(map, buf); ret = do_write_oneword(map, &cfi->chips[chipnum], ofs, datum); if (ret) return ret; ofs += map_bankwidth(map); buf += map_bankwidth(map); (*retlen) += map_bankwidth(map); len -= map_bankwidth(map); if (ofs >> cfi->chipshift) { chipnum ++; ofs = 0; if (chipnum == cfi->numchips) return 0; chipstart = cfi->chips[chipnum].start; } } /* Write the trailing bytes if any */ if (len & (map_bankwidth(map)-1)) { map_word tmp_buf; retry1: mutex_lock(&cfi->chips[chipnum].mutex); if (cfi->chips[chipnum].state != FL_READY) { #if 0 printk(KERN_DEBUG "Waiting for chip to write, status = %d\n", cfi->chips[chipnum].state); #endif set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&cfi->chips[chipnum].wq, &wait); mutex_unlock(&cfi->chips[chipnum].mutex); schedule(); remove_wait_queue(&cfi->chips[chipnum].wq, &wait); #if 0 if(signal_pending(current)) return -EINTR; #endif goto retry1; } tmp_buf = map_read(map, ofs + chipstart); mutex_unlock(&cfi->chips[chipnum].mutex); tmp_buf = map_word_load_partial(map, tmp_buf, buf, 0, len); ret = do_write_oneword(map, &cfi->chips[chipnum], ofs, tmp_buf); if (ret) return ret; (*retlen) += len; } return 0; } /* * FIXME: interleaved mode not tested, and probably not supported! */ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip, unsigned long adr, const u_char *buf, int len) { struct cfi_private *cfi = map->fldrv_priv; unsigned long timeo = jiffies + HZ; /* see comments in do_write_oneword() regarding uWriteTimeo. */ unsigned long uWriteTimeout = ( HZ / 1000 ) + 1; int ret = -EIO; unsigned long cmd_adr; int z, words; map_word datum; adr += chip->start; cmd_adr = adr; mutex_lock(&chip->mutex); ret = get_chip(map, chip, adr, FL_WRITING); if (ret) { mutex_unlock(&chip->mutex); return ret; } datum = map_word_load(map, buf); DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n", __func__, adr, datum.x[0] ); XIP_INVAL_CACHED_RANGE(map, adr, len); ENABLE_VPP(map); xip_disable(map, chip, cmd_adr); cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); //cfi_send_gen_cmd(0xA0, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); /* Write Buffer Load */ map_write(map, CMD(0x25), cmd_adr); chip->state = FL_WRITING_TO_BUFFER; /* Write length of data to come */ words = len / map_bankwidth(map); map_write(map, CMD(words - 1), cmd_adr); /* Write data */ z = 0; while(z < words * map_bankwidth(map)) { datum = map_word_load(map, buf); map_write(map, datum, adr + z); z += map_bankwidth(map); buf += map_bankwidth(map); } z -= map_bankwidth(map); adr += z; /* Write Buffer Program Confirm: GO GO GO */ map_write(map, CMD(0x29), cmd_adr); chip->state = FL_WRITING; INVALIDATE_CACHE_UDELAY(map, chip, adr, map_bankwidth(map), chip->word_write_time); timeo = jiffies + uWriteTimeout; for (;;) { if (chip->state != FL_WRITING) { /* Someone's suspended the write. Sleep */ DECLARE_WAITQUEUE(wait, current); set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&chip->wq, &wait); mutex_unlock(&chip->mutex); schedule(); remove_wait_queue(&chip->wq, &wait); timeo = jiffies + (HZ / 2); /* FIXME */ mutex_lock(&chip->mutex); continue; } if (time_after(jiffies, timeo) && !chip_ready(map, adr)) break; if (chip_ready(map, adr)) { xip_enable(map, chip, adr); goto op_done; } /* Latency issues. Drop the lock, wait a while and retry */ UDELAY(map, chip, adr, 1); } /* reset on all failures. */ map_write( map, CMD(0xF0), chip->start ); xip_enable(map, chip, adr); /* FIXME - should have reset delay before continuing */ printk(KERN_WARNING "MTD %s(): software timeout\n", __func__ ); ret = -EIO; op_done: chip->state = FL_READY; put_chip(map, chip, adr); mutex_unlock(&chip->mutex); return ret; } static int cfi_amdstd_write_buffers(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; int wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize; int ret = 0; int chipnum; unsigned long ofs; *retlen = 0; if (!len) return 0; chipnum = to >> cfi->chipshift; ofs = to - (chipnum << cfi->chipshift); /* If it's not bus-aligned, do the first word write */ if (ofs & (map_bankwidth(map)-1)) { size_t local_len = (-ofs)&(map_bankwidth(map)-1); if (local_len > len) local_len = len; ret = cfi_amdstd_write_words(mtd, ofs + (chipnum<chipshift), local_len, retlen, buf); if (ret) return ret; ofs += local_len; buf += local_len; len -= local_len; if (ofs >> cfi->chipshift) { chipnum ++; ofs = 0; if (chipnum == cfi->numchips) return 0; } } /* Write buffer is worth it only if more than one word to write... */ while (len >= map_bankwidth(map) * 2) { /* We must not cross write block boundaries */ int size = wbufsize - (ofs & (wbufsize-1)); if (size > len) size = len; if (size % map_bankwidth(map)) size -= size % map_bankwidth(map); ret = do_write_buffer(map, &cfi->chips[chipnum], ofs, buf, size); if (ret) return ret; ofs += size; buf += size; (*retlen) += size; len -= size; if (ofs >> cfi->chipshift) { chipnum ++; ofs = 0; if (chipnum == cfi->numchips) return 0; } } if (len) { size_t retlen_dregs = 0; ret = cfi_amdstd_write_words(mtd, ofs + (chipnum<chipshift), len, &retlen_dregs, buf); *retlen += retlen_dregs; return ret; } return 0; } /* * Handle devices with one erase region, that only implement * the chip erase command. */ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip) { struct cfi_private *cfi = map->fldrv_priv; unsigned long timeo = jiffies + HZ; unsigned long int adr; DECLARE_WAITQUEUE(wait, current); int ret = 0; adr = cfi->addr_unlock1; mutex_lock(&chip->mutex); ret = get_chip(map, chip, adr, FL_WRITING); if (ret) { mutex_unlock(&chip->mutex); return ret; } DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): ERASE 0x%.8lx\n", __func__, chip->start ); XIP_INVAL_CACHED_RANGE(map, adr, map->size); ENABLE_VPP(map); xip_disable(map, chip, adr); cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x10, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); chip->state = FL_ERASING; chip->erase_suspended = 0; chip->in_progress_block_addr = adr; INVALIDATE_CACHE_UDELAY(map, chip, adr, map->size, chip->erase_time*500); timeo = jiffies + (HZ*20); for (;;) { if (chip->state != FL_ERASING) { /* Someone's suspended the erase. Sleep */ set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&chip->wq, &wait); mutex_unlock(&chip->mutex); schedule(); remove_wait_queue(&chip->wq, &wait); mutex_lock(&chip->mutex); continue; } if (chip->erase_suspended) { /* This erase was suspended and resumed. Adjust the timeout */ timeo = jiffies + (HZ*20); /* FIXME */ chip->erase_suspended = 0; } if (chip_ready(map, adr)) break; if (time_after(jiffies, timeo)) { printk(KERN_WARNING "MTD %s(): software timeout\n", __func__ ); break; } /* Latency issues. Drop the lock, wait a while and retry */ UDELAY(map, chip, adr, 1000000/HZ); } /* Did we succeed? */ if (!chip_good(map, adr, map_word_ff(map))) { /* reset on all failures. */ map_write( map, CMD(0xF0), chip->start ); /* FIXME - should have reset delay before continuing */ ret = -EIO; } chip->state = FL_READY; xip_enable(map, chip, adr); put_chip(map, chip, adr); mutex_unlock(&chip->mutex); return ret; } static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr, int len, void *thunk) { struct cfi_private *cfi = map->fldrv_priv; unsigned long timeo = jiffies + HZ; DECLARE_WAITQUEUE(wait, current); int ret = 0; adr += chip->start; mutex_lock(&chip->mutex); ret = get_chip(map, chip, adr, FL_ERASING); if (ret) { mutex_unlock(&chip->mutex); return ret; } DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): ERASE 0x%.8lx\n", __func__, adr ); XIP_INVAL_CACHED_RANGE(map, adr, len); ENABLE_VPP(map); xip_disable(map, chip, adr); cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); map_write(map, CMD(0x30), adr); chip->state = FL_ERASING; chip->erase_suspended = 0; chip->in_progress_block_addr = adr; INVALIDATE_CACHE_UDELAY(map, chip, adr, len, chip->erase_time*500); timeo = jiffies + (HZ*20); for (;;) { if (chip->state != FL_ERASING) { /* Someone's suspended the erase. Sleep */ set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&chip->wq, &wait); mutex_unlock(&chip->mutex); schedule(); remove_wait_queue(&chip->wq, &wait); mutex_lock(&chip->mutex); continue; } if (chip->erase_suspended) { /* This erase was suspended and resumed. Adjust the timeout */ timeo = jiffies + (HZ*20); /* FIXME */ chip->erase_suspended = 0; } if (chip_ready(map, adr)) { xip_enable(map, chip, adr); break; } if (time_after(jiffies, timeo)) { xip_enable(map, chip, adr); printk(KERN_WARNING "MTD %s(): software timeout\n", __func__ ); break; } /* Latency issues. Drop the lock, wait a while and retry */ UDELAY(map, chip, adr, 1000000/HZ); } /* Did we succeed? */ if (!chip_good(map, adr, map_word_ff(map))) { /* reset on all failures. */ map_write( map, CMD(0xF0), chip->start ); /* FIXME - should have reset delay before continuing */ ret = -EIO; } chip->state = FL_READY; put_chip(map, chip, adr); mutex_unlock(&chip->mutex); return ret; } static int cfi_amdstd_erase_varsize(struct mtd_info *mtd, struct erase_info *instr) { unsigned long ofs, len; int ret; ofs = instr->addr; len = instr->len; ret = cfi_varsize_frob(mtd, do_erase_oneblock, ofs, len, NULL); if (ret) return ret; instr->state = MTD_ERASE_DONE; mtd_erase_callback(instr); return 0; } static int cfi_amdstd_erase_chip(struct mtd_info *mtd, struct erase_info *instr) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; int ret = 0; if (instr->addr != 0) return -EINVAL; if (instr->len != mtd->size) return -EINVAL; ret = do_erase_chip(map, &cfi->chips[0]); if (ret) return ret; instr->state = MTD_ERASE_DONE; mtd_erase_callback(instr); return 0; } static int do_atmel_lock(struct map_info *map, struct flchip *chip, unsigned long adr, int len, void *thunk) { struct cfi_private *cfi = map->fldrv_priv; int ret; mutex_lock(&chip->mutex); ret = get_chip(map, chip, adr + chip->start, FL_LOCKING); if (ret) goto out_unlock; chip->state = FL_LOCKING; DEBUG(MTD_DEBUG_LEVEL3, "MTD %s(): LOCK 0x%08lx len %d\n", __func__, adr, len); cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL); map_write(map, CMD(0x40), chip->start + adr); chip->state = FL_READY; put_chip(map, chip, adr + chip->start); ret = 0; out_unlock: mutex_unlock(&chip->mutex); return ret; } static int do_atmel_unlock(struct map_info *map, struct flchip *chip, unsigned long adr, int len, void *thunk) { struct cfi_private *cfi = map->fldrv_priv; int ret; mutex_lock(&chip->mutex); ret = get_chip(map, chip, adr + chip->start, FL_UNLOCKING); if (ret) goto out_unlock; chip->state = FL_UNLOCKING; DEBUG(MTD_DEBUG_LEVEL3, "MTD %s(): LOCK 0x%08lx len %d\n", __func__, adr, len); cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL); map_write(map, CMD(0x70), adr); chip->state = FL_READY; put_chip(map, chip, adr + chip->start); ret = 0; out_unlock: mutex_unlock(&chip->mutex); return ret; } static int cfi_atmel_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { return cfi_varsize_frob(mtd, do_atmel_lock, ofs, len, NULL); } static int cfi_atmel_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { return cfi_varsize_frob(mtd, do_atmel_unlock, ofs, len, NULL); } static void cfi_amdstd_sync (struct mtd_info *mtd) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; int i; struct flchip *chip; int ret = 0; DECLARE_WAITQUEUE(wait, current); for (i=0; !ret && inumchips; i++) { chip = &cfi->chips[i]; retry: mutex_lock(&chip->mutex); switch(chip->state) { case FL_READY: case FL_STATUS: case FL_CFI_QUERY: case FL_JEDEC_QUERY: chip->oldstate = chip->state; chip->state = FL_SYNCING; /* No need to wake_up() on this state change - * as the whole point is that nobody can do anything * with the chip now anyway. */ case FL_SYNCING: mutex_unlock(&chip->mutex); break; default: /* Not an idle state */ set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&chip->wq, &wait); mutex_unlock(&chip->mutex); schedule(); remove_wait_queue(&chip->wq, &wait); goto retry; } } /* Unlock the chips again */ for (i--; i >=0; i--) { chip = &cfi->chips[i]; mutex_lock(&chip->mutex); if (chip->state == FL_SYNCING) { chip->state = chip->oldstate; wake_up(&chip->wq); } mutex_unlock(&chip->mutex); } } static int cfi_amdstd_suspend(struct mtd_info *mtd) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; int i; struct flchip *chip; int ret = 0; for (i=0; !ret && inumchips; i++) { chip = &cfi->chips[i]; mutex_lock(&chip->mutex); switch(chip->state) { case FL_READY: case FL_STATUS: case FL_CFI_QUERY: case FL_JEDEC_QUERY: chip->oldstate = chip->state; chip->state = FL_PM_SUSPENDED; /* No need to wake_up() on this state change - * as the whole point is that nobody can do anything * with the chip now anyway. */ case FL_PM_SUSPENDED: break; default: ret = -EAGAIN; break; } mutex_unlock(&chip->mutex); } /* Unlock the chips again */ if (ret) { for (i--; i >=0; i--) { chip = &cfi->chips[i]; mutex_lock(&chip->mutex); if (chip->state == FL_PM_SUSPENDED) { chip->state = chip->oldstate; wake_up(&chip->wq); } mutex_unlock(&chip->mutex); } } return ret; } static void cfi_amdstd_resume(struct mtd_info *mtd) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; int i; struct flchip *chip; for (i=0; inumchips; i++) { chip = &cfi->chips[i]; mutex_lock(&chip->mutex); if (chip->state == FL_PM_SUSPENDED) { chip->state = FL_READY; map_write(map, CMD(0xF0), chip->start); wake_up(&chip->wq); } else printk(KERN_ERR "Argh. Chip not in PM_SUSPENDED state upon resume()\n"); mutex_unlock(&chip->mutex); } } /* * Ensure that the flash device is put back into read array mode before * unloading the driver or rebooting. On some systems, rebooting while * the flash is in query/program/erase mode will prevent the CPU from * fetching the bootloader code, requiring a hard reset or power cycle. */ static int cfi_amdstd_reset(struct mtd_info *mtd) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; int i, ret; struct flchip *chip; for (i = 0; i < cfi->numchips; i++) { chip = &cfi->chips[i]; mutex_lock(&chip->mutex); ret = get_chip(map, chip, chip->start, FL_SHUTDOWN); if (!ret) { map_write(map, CMD(0xF0), chip->start); chip->state = FL_SHUTDOWN; put_chip(map, chip, chip->start); } mutex_unlock(&chip->mutex); } return 0; } static int cfi_amdstd_reboot(struct notifier_block *nb, unsigned long val, void *v) { struct mtd_info *mtd; mtd = container_of(nb, struct mtd_info, reboot_notifier); cfi_amdstd_reset(mtd); return NOTIFY_DONE; } static void cfi_amdstd_destroy(struct mtd_info *mtd) { struct map_info *map = mtd->priv; struct cfi_private *cfi = map->fldrv_priv; cfi_amdstd_reset(mtd); unregister_reboot_notifier(&mtd->reboot_notifier); kfree(cfi->cmdset_priv); kfree(cfi->cfiq); kfree(cfi); kfree(mtd->eraseregions); } MODULE_LICENSE("GPL"); MODULE_AUTHOR("Crossnet Co. et al."); MODULE_DESCRIPTION("MTD chip driver for AMD/Fujitsu flash chips");