From bf22433575ef30a4807f0620498017df0f27df67 Mon Sep 17 00:00:00 2001 From: Philip Avinash Date: Fri, 4 Jan 2013 13:26:50 +0530 Subject: mtd: devices: elm: Add support for ELM error correction The ELM hardware module can be used to speedup BCH 4/8/16 ECC scheme error correction. For now only 4 & 8 bit support is added Signed-off-by: Philip Avinash Signed-off-by: Artem Bityutskiy --- Documentation/devicetree/bindings/mtd/elm.txt | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/elm.txt (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/mtd/elm.txt b/Documentation/devicetree/bindings/mtd/elm.txt new file mode 100644 index 000000000000..e43c668656bc --- /dev/null +++ b/Documentation/devicetree/bindings/mtd/elm.txt @@ -0,0 +1,16 @@ +Error location module + +Required properties: +- compatible: Must be "ti,am33xx-elm" +- reg: physical base address and size of the registers map. +- interrupts: Interrupt number for the elm. + +Optional properties: +- ti,hwmods: Name of the hwmod associated to the elm + +Example: +elm: elm@0 { + compatible = "ti,am33xx-elm"; + reg = <0x48080000 0x2000>; + interrupts = <4>; +}; -- cgit v1.2.3-59-g8ed1b From 1648eaaa1575ea686acb82fb8cb3d8839764ef2c Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Fri, 18 Jan 2013 13:10:05 +0100 Subject: mtd: cfi_cmdset_0002: Support Persistent Protection Bits (PPB) locking Currently cfi_cmdset_0002.c does not support PPB locking of sectors. This patch adds support for this locking/unlocking mechanism. It is needed on some platforms, since newer U-Boot versions do support this PPB locking and protect for example their environment sector(s) this way. This PPB locking/unlocking will be enabled for all devices supported by cfi_cmdset_0002 reporting 8 in the CFI word 0x49 (Sector Protect/Unprotect scheme). Please note that PPB locking does support sector-by-sector locking. But the whole chip can only be unlocked together. So unlocking one sector will automatically unlock all sectors of this device. Because of this chip limitation, the PPB unlocking function saves the current locking status of all sectors before unlocking the whole device. After unlocking the saved locking status is re-configured. This way only the addressed sectors will be unlocked. To selectively enable this advanced sector protection mechanism, the device-tree property "use-advanced-sector-protection" has been created. To enable support for this locking this property needs to be present in the flash DT node. E.g.: nor_flash@0,0 { compatible = "amd,s29gl256n", "cfi-flash"; bank-width = <2>; use-advanced-sector-protection; ... Tested with Spansion S29GL512S10THI and Micron JS28F512M29EWx flash devices. Signed-off-by: Stefan Roese Tested-by: Holger Brunck Signed-off-by: Artem Bityutskiy --- .../devicetree/bindings/mtd/mtd-physmap.txt | 3 + drivers/mtd/chips/cfi_cmdset_0002.c | 217 +++++++++++++++++++++ drivers/mtd/maps/physmap_of.c | 1 + include/linux/mtd/map.h | 1 + 4 files changed, 222 insertions(+) (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/mtd/mtd-physmap.txt b/Documentation/devicetree/bindings/mtd/mtd-physmap.txt index dab7847fc800..61c5ec850f2f 100644 --- a/Documentation/devicetree/bindings/mtd/mtd-physmap.txt +++ b/Documentation/devicetree/bindings/mtd/mtd-physmap.txt @@ -26,6 +26,9 @@ file systems on embedded devices. - linux,mtd-name: allow to specify the mtd name for retro capability with physmap-flash drivers as boot loader pass the mtd partition via the old device name physmap-flash. + - use-advanced-sector-protection: boolean to enable support for the + advanced sector protection (Spansion: PPB - Persistent Protection + Bits) locking. For JEDEC compatible devices, the following additional properties are defined: diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c index b86197286f24..fff665d59a0d 100644 --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -33,6 +33,8 @@ #include #include #include +#include +#include #include #include #include @@ -74,6 +76,10 @@ static void put_chip(struct map_info *map, struct flchip *chip, unsigned long ad 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 int cfi_ppb_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len); +static int cfi_ppb_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len); +static int cfi_ppb_is_locked(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, @@ -496,6 +502,7 @@ static void cfi_fixup_m29ew_delay_after_resume(struct cfi_private *cfi) struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary) { struct cfi_private *cfi = map->fldrv_priv; + struct device_node __maybe_unused *np = map->device_node; struct mtd_info *mtd; int i; @@ -570,6 +577,17 @@ struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary) cfi_tell_features(extp); #endif +#ifdef CONFIG_OF + if (np && of_property_read_bool( + np, "use-advanced-sector-protection") + && extp->BlkProtUnprot == 8) { + printk(KERN_INFO " Advanced Sector Protection (PPB Locking) supported\n"); + mtd->_lock = cfi_ppb_lock; + mtd->_unlock = cfi_ppb_unlock; + mtd->_is_locked = cfi_ppb_is_locked; + } +#endif + bootloc = extp->TopBottom; if ((bootloc < 2) || (bootloc > 5)) { printk(KERN_WARNING "%s: CFI contains unrecognised boot " @@ -2172,6 +2190,205 @@ 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); } +/* + * Advanced Sector Protection - PPB (Persistent Protection Bit) locking + */ + +struct ppb_lock { + struct flchip *chip; + loff_t offset; + int locked; +}; + +#define MAX_SECTORS 512 + +#define DO_XXLOCK_ONEBLOCK_LOCK ((void *)1) +#define DO_XXLOCK_ONEBLOCK_UNLOCK ((void *)2) +#define DO_XXLOCK_ONEBLOCK_GETLOCK ((void *)3) + +static int __maybe_unused do_ppb_xxlock(struct map_info *map, + struct flchip *chip, + unsigned long adr, int len, void *thunk) +{ + struct cfi_private *cfi = map->fldrv_priv; + unsigned long timeo; + int ret; + + mutex_lock(&chip->mutex); + ret = get_chip(map, chip, adr + chip->start, FL_LOCKING); + if (ret) { + mutex_unlock(&chip->mutex); + return ret; + } + + pr_debug("MTD %s(): XXLOCK 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); + /* PPB entry command */ + cfi_send_gen_cmd(0xC0, cfi->addr_unlock1, chip->start, map, cfi, + cfi->device_type, NULL); + + if (thunk == DO_XXLOCK_ONEBLOCK_LOCK) { + chip->state = FL_LOCKING; + map_write(map, CMD(0xA0), chip->start + adr); + map_write(map, CMD(0x00), chip->start + adr); + } else if (thunk == DO_XXLOCK_ONEBLOCK_UNLOCK) { + /* + * Unlocking of one specific sector is not supported, so we + * have to unlock all sectors of this device instead + */ + chip->state = FL_UNLOCKING; + map_write(map, CMD(0x80), chip->start); + map_write(map, CMD(0x30), chip->start); + } else if (thunk == DO_XXLOCK_ONEBLOCK_GETLOCK) { + chip->state = FL_JEDEC_QUERY; + /* Return locked status: 0->locked, 1->unlocked */ + ret = !cfi_read_query(map, adr); + } else + BUG(); + + /* + * Wait for some time as unlocking of all sectors takes quite long + */ + timeo = jiffies + msecs_to_jiffies(2000); /* 2s max (un)locking */ + for (;;) { + if (chip_ready(map, adr)) + break; + + if (time_after(jiffies, timeo)) { + printk(KERN_ERR "Waiting for chip to be ready timed out.\n"); + ret = -EIO; + break; + } + + UDELAY(map, chip, adr, 1); + } + + /* Exit BC commands */ + map_write(map, CMD(0x90), chip->start); + map_write(map, CMD(0x00), chip->start); + + chip->state = FL_READY; + put_chip(map, chip, adr + chip->start); + mutex_unlock(&chip->mutex); + + return ret; +} + +static int __maybe_unused cfi_ppb_lock(struct mtd_info *mtd, loff_t ofs, + uint64_t len) +{ + return cfi_varsize_frob(mtd, do_ppb_xxlock, ofs, len, + DO_XXLOCK_ONEBLOCK_LOCK); +} + +static int __maybe_unused cfi_ppb_unlock(struct mtd_info *mtd, loff_t ofs, + uint64_t len) +{ + struct mtd_erase_region_info *regions = mtd->eraseregions; + struct map_info *map = mtd->priv; + struct cfi_private *cfi = map->fldrv_priv; + struct ppb_lock *sect; + unsigned long adr; + loff_t offset; + uint64_t length; + int chipnum; + int i; + int sectors; + int ret; + + /* + * PPB unlocking always unlocks all sectors of the flash chip. + * We need to re-lock all previously locked sectors. So lets + * first check the locking status of all sectors and save + * it for future use. + */ + sect = kzalloc(MAX_SECTORS * sizeof(struct ppb_lock), GFP_KERNEL); + if (!sect) + return -ENOMEM; + + /* + * This code to walk all sectors is a slightly modified version + * of the cfi_varsize_frob() code. + */ + i = 0; + chipnum = 0; + adr = 0; + sectors = 0; + offset = 0; + length = mtd->size; + + while (length) { + int size = regions[i].erasesize; + + /* + * Only test sectors that shall not be unlocked. The other + * sectors shall be unlocked, so lets keep their locking + * status at "unlocked" (locked=0) for the final re-locking. + */ + if ((adr < ofs) || (adr >= (ofs + len))) { + sect[sectors].chip = &cfi->chips[chipnum]; + sect[sectors].offset = offset; + sect[sectors].locked = do_ppb_xxlock( + map, &cfi->chips[chipnum], adr, 0, + DO_XXLOCK_ONEBLOCK_GETLOCK); + } + + adr += size; + offset += size; + length -= size; + + if (offset == regions[i].offset + size * regions[i].numblocks) + i++; + + if (adr >> cfi->chipshift) { + adr = 0; + chipnum++; + + if (chipnum >= cfi->numchips) + break; + } + + sectors++; + if (sectors >= MAX_SECTORS) { + printk(KERN_ERR "Only %d sectors for PPB locking supported!\n", + MAX_SECTORS); + kfree(sect); + return -EINVAL; + } + } + + /* Now unlock the whole chip */ + ret = cfi_varsize_frob(mtd, do_ppb_xxlock, ofs, len, + DO_XXLOCK_ONEBLOCK_UNLOCK); + if (ret) { + kfree(sect); + return ret; + } + + /* + * PPB unlocking always unlocks all sectors of the flash chip. + * We need to re-lock all previously locked sectors. + */ + for (i = 0; i < sectors; i++) { + if (sect[i].locked) + do_ppb_xxlock(map, sect[i].chip, sect[i].offset, 0, + DO_XXLOCK_ONEBLOCK_LOCK); + } + + kfree(sect); + return ret; +} + +static int __maybe_unused cfi_ppb_is_locked(struct mtd_info *mtd, loff_t ofs, + uint64_t len) +{ + return cfi_varsize_frob(mtd, do_ppb_xxlock, ofs, len, + DO_XXLOCK_ONEBLOCK_GETLOCK) ? 1 : 0; +} static void cfi_amdstd_sync (struct mtd_info *mtd) { diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c index 67cc73c18ddd..263d9e1b8001 100644 --- a/drivers/mtd/maps/physmap_of.c +++ b/drivers/mtd/maps/physmap_of.c @@ -241,6 +241,7 @@ static int of_flash_probe(struct platform_device *dev) info->list[i].map.phys = res.start; info->list[i].map.size = res_size; info->list[i].map.bankwidth = be32_to_cpup(width); + info->list[i].map.device_node = dp; err = -ENOMEM; info->list[i].map.virt = ioremap(info->list[i].map.phys, diff --git a/include/linux/mtd/map.h b/include/linux/mtd/map.h index f6eb4332ac92..8b9bfd7dcaa3 100644 --- a/include/linux/mtd/map.h +++ b/include/linux/mtd/map.h @@ -245,6 +245,7 @@ struct map_info { unsigned long pfow_base; unsigned long map_priv_1; unsigned long map_priv_2; + struct device_node *device_node; void *fldrv_priv; struct mtd_chip_driver *fldrv; }; -- cgit v1.2.3-59-g8ed1b From c80e572c029263687b8175f1ba71d425548cafcf Mon Sep 17 00:00:00 2001 From: Philip Avinash Date: Thu, 24 Jan 2013 12:23:30 +0530 Subject: mtd: devices: elm: Removes literals in elm DT node As part of removing generalized dependency, replace literal fields in DT compatible field with <52> for am335x platforms. Signed-off-by: Philip Avinash Acked-by: Peter Korsgaard Signed-off-by: Artem Bityutskiy --- Documentation/devicetree/bindings/mtd/elm.txt | 2 +- drivers/mtd/devices/elm.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/mtd/elm.txt b/Documentation/devicetree/bindings/mtd/elm.txt index e43c668656bc..8c1528c421d4 100644 --- a/Documentation/devicetree/bindings/mtd/elm.txt +++ b/Documentation/devicetree/bindings/mtd/elm.txt @@ -10,7 +10,7 @@ Optional properties: Example: elm: elm@0 { - compatible = "ti,am33xx-elm"; + compatible = "ti,am3352-elm"; reg = <0x48080000 0x2000>; interrupts = <4>; }; diff --git a/drivers/mtd/devices/elm.c b/drivers/mtd/devices/elm.c index b93a349ae587..2ec5da9ee248 100644 --- a/drivers/mtd/devices/elm.c +++ b/drivers/mtd/devices/elm.c @@ -380,7 +380,7 @@ static int elm_remove(struct platform_device *pdev) #ifdef CONFIG_OF static const struct of_device_id elm_of_match[] = { - { .compatible = "ti,am33xx-elm" }, + { .compatible = "ti,am3352-elm" }, {}, }; MODULE_DEVICE_TABLE(of, elm_of_match); -- cgit v1.2.3-59-g8ed1b