diff options
Diffstat (limited to 'drivers/mtd/devices')
| -rw-r--r-- | drivers/mtd/devices/Makefile | 4 | ||||
| -rw-r--r-- | drivers/mtd/devices/bcm47xxsflash.c | 55 | ||||
| -rw-r--r-- | drivers/mtd/devices/bcm47xxsflash.h | 15 | ||||
| -rw-r--r-- | drivers/mtd/devices/elm.c | 404 | ||||
| -rw-r--r-- | drivers/mtd/devices/m25p80.c | 100 |
5 files changed, 560 insertions, 18 deletions
diff --git a/drivers/mtd/devices/Makefile b/drivers/mtd/devices/Makefile index 395733a30ef..369a1943ca2 100644 --- a/drivers/mtd/devices/Makefile +++ b/drivers/mtd/devices/Makefile @@ -17,8 +17,10 @@ obj-$(CONFIG_MTD_LART) += lart.o obj-$(CONFIG_MTD_BLOCK2MTD) += block2mtd.o obj-$(CONFIG_MTD_DATAFLASH) += mtd_dataflash.o obj-$(CONFIG_MTD_M25P80) += m25p80.o +obj-$(CONFIG_MTD_NAND_OMAP_BCH) += elm.o obj-$(CONFIG_MTD_SPEAR_SMI) += spear_smi.o obj-$(CONFIG_MTD_SST25L) += sst25l.o obj-$(CONFIG_MTD_BCM47XXSFLASH) += bcm47xxsflash.o -CFLAGS_docg3.o += -I$(src)
\ No newline at end of file + +CFLAGS_docg3.o += -I$(src) diff --git a/drivers/mtd/devices/bcm47xxsflash.c b/drivers/mtd/devices/bcm47xxsflash.c index 4714584aa99..95266285acb 100644 --- a/drivers/mtd/devices/bcm47xxsflash.c +++ b/drivers/mtd/devices/bcm47xxsflash.c @@ -5,6 +5,8 @@ #include <linux/platform_device.h> #include <linux/bcma/bcma.h> +#include "bcm47xxsflash.h" + MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Serial flash driver for BCMA bus"); @@ -13,26 +15,28 @@ static const char *probes[] = { "bcm47xxpart", NULL }; static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { - struct bcma_sflash *sflash = mtd->priv; + struct bcm47xxsflash *b47s = mtd->priv; /* Check address range */ if ((from + len) > mtd->size) return -EINVAL; - memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(sflash->window + from), + memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from), len); + *retlen = len; return len; } -static void bcm47xxsflash_fill_mtd(struct bcma_sflash *sflash, - struct mtd_info *mtd) +static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s) { - mtd->priv = sflash; + struct mtd_info *mtd = &b47s->mtd; + + mtd->priv = b47s; mtd->name = "bcm47xxsflash"; mtd->owner = THIS_MODULE; mtd->type = MTD_ROM; - mtd->size = sflash->size; + mtd->size = b47s->size; mtd->_read = bcm47xxsflash_read; /* TODO: implement writing support and verify/change following code */ @@ -40,19 +44,30 @@ static void bcm47xxsflash_fill_mtd(struct bcma_sflash *sflash, mtd->writebufsize = mtd->writesize = 1; } -static int bcm47xxsflash_probe(struct platform_device *pdev) +/************************************************** + * BCMA + **************************************************/ + +static int bcm47xxsflash_bcma_probe(struct platform_device *pdev) { struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev); + struct bcm47xxsflash *b47s; int err; - sflash->mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL); - if (!sflash->mtd) { + b47s = kzalloc(sizeof(*b47s), GFP_KERNEL); + if (!b47s) { err = -ENOMEM; goto out; } - bcm47xxsflash_fill_mtd(sflash, sflash->mtd); + sflash->priv = b47s; - err = mtd_device_parse_register(sflash->mtd, probes, NULL, NULL, 0); + b47s->window = sflash->window; + b47s->blocksize = sflash->blocksize; + b47s->numblocks = sflash->numblocks; + b47s->size = sflash->size; + bcm47xxsflash_fill_mtd(b47s); + + err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0); if (err) { pr_err("Failed to register MTD device: %d\n", err); goto err_dev_reg; @@ -61,34 +76,40 @@ static int bcm47xxsflash_probe(struct platform_device *pdev) return 0; err_dev_reg: - kfree(sflash->mtd); + kfree(&b47s->mtd); out: return err; } -static int bcm47xxsflash_remove(struct platform_device *pdev) +static int bcm47xxsflash_bcma_remove(struct platform_device *pdev) { struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev); + struct bcm47xxsflash *b47s = sflash->priv; - mtd_device_unregister(sflash->mtd); - kfree(sflash->mtd); + mtd_device_unregister(&b47s->mtd); + kfree(b47s); return 0; } static struct platform_driver bcma_sflash_driver = { - .remove = bcm47xxsflash_remove, + .probe = bcm47xxsflash_bcma_probe, + .remove = bcm47xxsflash_bcma_remove, .driver = { .name = "bcma_sflash", .owner = THIS_MODULE, }, }; +/************************************************** + * Init + **************************************************/ + static int __init bcm47xxsflash_init(void) { int err; - err = platform_driver_probe(&bcma_sflash_driver, bcm47xxsflash_probe); + err = platform_driver_register(&bcma_sflash_driver); if (err) pr_err("Failed to register BCMA serial flash driver: %d\n", err); diff --git a/drivers/mtd/devices/bcm47xxsflash.h b/drivers/mtd/devices/bcm47xxsflash.h new file mode 100644 index 00000000000..ebf6f710e23 --- /dev/null +++ b/drivers/mtd/devices/bcm47xxsflash.h @@ -0,0 +1,15 @@ +#ifndef __BCM47XXSFLASH_H +#define __BCM47XXSFLASH_H + +#include <linux/mtd/mtd.h> + +struct bcm47xxsflash { + u32 window; + u32 blocksize; + u16 numblocks; + u32 size; + + struct mtd_info mtd; +}; + +#endif /* BCM47XXSFLASH */ diff --git a/drivers/mtd/devices/elm.c b/drivers/mtd/devices/elm.c new file mode 100644 index 00000000000..2ec5da9ee24 --- /dev/null +++ b/drivers/mtd/devices/elm.c @@ -0,0 +1,404 @@ +/* + * Error Location Module + * + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/pm_runtime.h> +#include <linux/platform_data/elm.h> + +#define ELM_IRQSTATUS 0x018 +#define ELM_IRQENABLE 0x01c +#define ELM_LOCATION_CONFIG 0x020 +#define ELM_PAGE_CTRL 0x080 +#define ELM_SYNDROME_FRAGMENT_0 0x400 +#define ELM_SYNDROME_FRAGMENT_6 0x418 +#define ELM_LOCATION_STATUS 0x800 +#define ELM_ERROR_LOCATION_0 0x880 + +/* ELM Interrupt Status Register */ +#define INTR_STATUS_PAGE_VALID BIT(8) + +/* ELM Interrupt Enable Register */ +#define INTR_EN_PAGE_MASK BIT(8) + +/* ELM Location Configuration Register */ +#define ECC_BCH_LEVEL_MASK 0x3 + +/* ELM syndrome */ +#define ELM_SYNDROME_VALID BIT(16) + +/* ELM_LOCATION_STATUS Register */ +#define ECC_CORRECTABLE_MASK BIT(8) +#define ECC_NB_ERRORS_MASK 0x1f + +/* ELM_ERROR_LOCATION_0-15 Registers */ +#define ECC_ERROR_LOCATION_MASK 0x1fff + +#define ELM_ECC_SIZE 0x7ff + +#define SYNDROME_FRAGMENT_REG_SIZE 0x40 +#define ERROR_LOCATION_SIZE 0x100 + +struct elm_info { + struct device *dev; + void __iomem *elm_base; + struct completion elm_completion; + struct list_head list; + enum bch_ecc bch_type; +}; + +static LIST_HEAD(elm_devices); + +static void elm_write_reg(struct elm_info *info, int offset, u32 val) +{ + writel(val, info->elm_base + offset); +} + +static u32 elm_read_reg(struct elm_info *info, int offset) +{ + return readl(info->elm_base + offset); +} + +/** + * elm_config - Configure ELM module + * @dev: ELM device + * @bch_type: Type of BCH ecc + */ +void elm_config(struct device *dev, enum bch_ecc bch_type) +{ + u32 reg_val; + struct elm_info *info = dev_get_drvdata(dev); + + reg_val = (bch_type & ECC_BCH_LEVEL_MASK) | (ELM_ECC_SIZE << 16); + elm_write_reg(info, ELM_LOCATION_CONFIG, reg_val); + info->bch_type = bch_type; +} +EXPORT_SYMBOL(elm_config); + +/** + * elm_configure_page_mode - Enable/Disable page mode + * @info: elm info + * @index: index number of syndrome fragment vector + * @enable: enable/disable flag for page mode + * + * Enable page mode for syndrome fragment index + */ +static void elm_configure_page_mode(struct elm_info *info, int index, + bool enable) +{ + u32 reg_val; + + reg_val = elm_read_reg(info, ELM_PAGE_CTRL); + if (enable) + reg_val |= BIT(index); /* enable page mode */ + else + reg_val &= ~BIT(index); /* disable page mode */ + + elm_write_reg(info, ELM_PAGE_CTRL, reg_val); +} + +/** + * elm_load_syndrome - Load ELM syndrome reg + * @info: elm info + * @err_vec: elm error vectors + * @ecc: buffer with calculated ecc + * + * Load syndrome fragment registers with calculated ecc in reverse order. + */ +static void elm_load_syndrome(struct elm_info *info, + struct elm_errorvec *err_vec, u8 *ecc) +{ + int i, offset; + u32 val; + + for (i = 0; i < ERROR_VECTOR_MAX; i++) { + + /* Check error reported */ + if (err_vec[i].error_reported) { + elm_configure_page_mode(info, i, true); + offset = ELM_SYNDROME_FRAGMENT_0 + + SYNDROME_FRAGMENT_REG_SIZE * i; + + /* BCH8 */ + if (info->bch_type) { + + /* syndrome fragment 0 = ecc[9-12B] */ + val = cpu_to_be32(*(u32 *) &ecc[9]); + elm_write_reg(info, offset, val); + + /* syndrome fragment 1 = ecc[5-8B] */ + offset += 4; + val = cpu_to_be32(*(u32 *) &ecc[5]); + elm_write_reg(info, offset, val); + + /* syndrome fragment 2 = ecc[1-4B] */ + offset += 4; + val = cpu_to_be32(*(u32 *) &ecc[1]); + elm_write_reg(info, offset, val); + + /* syndrome fragment 3 = ecc[0B] */ + offset += 4; + val = ecc[0]; + elm_write_reg(info, offset, val); + } else { + /* syndrome fragment 0 = ecc[20-52b] bits */ + val = (cpu_to_be32(*(u32 *) &ecc[3]) >> 4) | + ((ecc[2] & 0xf) << 28); + elm_write_reg(info, offset, val); + + /* syndrome fragment 1 = ecc[0-20b] bits */ + offset += 4; + val = cpu_to_be32(*(u32 *) &ecc[0]) >> 12; + elm_write_reg(info, offset, val); + } + } + + /* Update ecc pointer with ecc byte size */ + ecc += info->bch_type ? BCH8_SIZE : BCH4_SIZE; + } +} + +/** + * elm_start_processing - start elm syndrome processing + * @info: elm info + * @err_vec: elm error vectors + * + * Set syndrome valid bit for syndrome fragment registers for which + * elm syndrome fragment registers are loaded. This enables elm module + * to start processing syndrome vectors. + */ +static void elm_start_processing(struct elm_info *info, + struct elm_errorvec *err_vec) +{ + int i, offset; + u32 reg_val; + + /* + * Set syndrome vector valid, so that ELM module + * will process it for vectors error is reported + */ + for (i = 0; i < ERROR_VECTOR_MAX; i++) { + if (err_vec[i].error_reported) { + offset = ELM_SYNDROME_FRAGMENT_6 + + SYNDROME_FRAGMENT_REG_SIZE * i; + reg_val = elm_read_reg(info, offset); + reg_val |= ELM_SYNDROME_VALID; + elm_write_reg(info, offset, reg_val); + } + } +} + +/** + * elm_error_correction - locate correctable error position + * @info: elm info + * @err_vec: elm error vectors + * + * On completion of processing by elm module, error location status + * register updated with correctable/uncorrectable error information. + * In case of correctable errors, number of errors located from + * elm location status register & read the positions from + * elm error location register. + */ +static void elm_error_correction(struct elm_info *info, + struct elm_errorvec *err_vec) +{ + int i, j, errors = 0; + int offset; + u32 reg_val; + + for (i = 0; i < ERROR_VECTOR_MAX; i++) { + + /* Check error reported */ + if (err_vec[i].error_reported) { + offset = ELM_LOCATION_STATUS + ERROR_LOCATION_SIZE * i; + reg_val = elm_read_reg(info, offset); + + /* Check correctable error or not */ + if (reg_val & ECC_CORRECTABLE_MASK) { + offset = ELM_ERROR_LOCATION_0 + + ERROR_LOCATION_SIZE * i; + + /* Read count of correctable errors */ + err_vec[i].error_count = reg_val & + ECC_NB_ERRORS_MASK; + + /* Update the error locations in error vector */ + for (j = 0; j < err_vec[i].error_count; j++) { + + reg_val = elm_read_reg(info, offset); + err_vec[i].error_loc[j] = reg_val & + ECC_ERROR_LOCATION_MASK; + + /* Update error location register */ + offset += 4; + } + + errors += err_vec[i].error_count; + } else { + err_vec[i].error_uncorrectable = true; + } + + /* Clearing interrupts for processed error vectors */ + elm_write_reg(info, ELM_IRQSTATUS, BIT(i)); + + /* Disable page mode */ + elm_configure_page_mode(info, i, false); + } + } +} + +/** + * elm_decode_bch_error_page - Locate error position + * @dev: device pointer + * @ecc_calc: calculated ECC bytes from GPMC + * @err_vec: elm error vectors + * + * Called with one or more error reported vectors & vectors with + * error reported is updated in err_vec[].error_reported + */ +void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc, + struct elm_errorvec *err_vec) +{ + struct elm_info *info = dev_get_drvdata(dev); + u32 reg_val; + + /* Enable page mode interrupt */ + reg_val = elm_read_reg(info, ELM_IRQSTATUS); + elm_write_reg(info, ELM_IRQSTATUS, reg_val & INTR_STATUS_PAGE_VALID); + elm_write_reg(info, ELM_IRQENABLE, INTR_EN_PAGE_MASK); + + /* Load valid ecc byte to syndrome fragment register */ + elm_load_syndrome(info, err_vec, ecc_calc); + + /* Enable syndrome processing for which syndrome fragment is updated */ + elm_start_processing(info, err_vec); + + /* Wait for ELM module to finish locating error correction */ + wait_for_completion(&info->elm_completion); + + /* Disable page mode interrupt */ + reg_val = elm_read_reg(info, ELM_IRQENABLE); + elm_write_reg(info, ELM_IRQENABLE, reg_val & ~INTR_EN_PAGE_MASK); + elm_error_correction(info, err_vec); +} +EXPORT_SYMBOL(elm_decode_bch_error_page); + +static irqreturn_t elm_isr(int this_irq, void *dev_id) +{ + u32 reg_val; + struct elm_info *info = dev_id; + + reg_val = elm_read_reg(info, ELM_IRQSTATUS); + + /* All error vectors processed */ + if (reg_val & INTR_STATUS_PAGE_VALID) { + elm_write_reg(info, ELM_IRQSTATUS, + reg_val & INTR_STATUS_PAGE_VALID); + complete(&info->elm_completion); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int elm_probe(struct platform_device *pdev) +{ + int ret = 0; + struct resource *res, *irq; + struct elm_info *info; + + info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); + if (!info) { + dev_err(&pdev->dev, "failed to allocate memory\n"); + return -ENOMEM; + } + + info->dev = &pdev->dev; + + irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!irq) { + dev_err(&pdev->dev, "no irq resource defined\n"); + return -ENODEV; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "no memory resource defined\n"); + return -ENODEV; + } + + info->elm_base = devm_request_and_ioremap(&pdev->dev, res); + if (!info->elm_base) + return -EADDRNOTAVAIL; + + ret = devm_request_irq(&pdev->dev, irq->start, elm_isr, 0, + pdev->name, info); + if (ret) { + dev_err(&pdev->dev, "failure requesting irq %i\n", irq->start); + return ret; + } + + pm_runtime_enable(&pdev->dev); + if (pm_runtime_get_sync(&pdev->dev)) { + ret = -EINVAL; + pm_runtime_disable(&pdev->dev); + dev_err(&pdev->dev, "can't enable clock\n"); + return ret; + } + + init_completion(&info->elm_completion); + INIT_LIST_HEAD(&info->list); + list_add(&info->list, &elm_devices); + platform_set_drvdata(pdev, info); + return ret; +} + +static int elm_remove(struct platform_device *pdev) +{ + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); + platform_set_drvdata(pdev, NULL); + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id elm_of_match[] = { + { .compatible = "ti,am3352-elm" }, + {}, +}; +MODULE_DEVICE_TABLE(of, elm_of_match); +#endif + +static struct platform_driver elm_driver = { + .driver = { + .name = "elm", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(elm_of_match), + }, + .probe = elm_probe, + .remove = elm_remove, +}; + +module_platform_driver(elm_driver); + +MODULE_DESCRIPTION("ELM driver for BCH error correction"); +MODULE_AUTHOR("Texas Instruments"); +MODULE_ALIAS("platform: elm"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index 4eeeb2d7f6e..5b6b0728be2 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -565,6 +565,96 @@ time_out: return ret; } +static int m25p80_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) +{ + struct m25p *flash = mtd_to_m25p(mtd); + uint32_t offset = ofs; + uint8_t status_old, status_new; + int res = 0; + + mutex_lock(&flash->lock); + /* Wait until finished previous command */ + if (wait_till_ready(flash)) { + res = 1; + goto err; + } + + status_old = read_sr(flash); + + if (offset < flash->mtd.size-(flash->mtd.size/2)) + status_new = status_old | SR_BP2 | SR_BP1 | SR_BP0; + else if (offset < flash->mtd.size-(flash->mtd.size/4)) + status_new = (status_old & ~SR_BP0) | SR_BP2 | SR_BP1; + else if (offset < flash->mtd.size-(flash->mtd.size/8)) + status_new = (status_old & ~SR_BP1) | SR_BP2 | SR_BP0; + else if (offset < flash->mtd.size-(flash->mtd.size/16)) + status_new = (status_old & ~(SR_BP0|SR_BP1)) | SR_BP2; + else if (offset < flash->mtd.size-(flash->mtd.size/32)) + status_new = (status_old & ~SR_BP2) | SR_BP1 | SR_BP0; + else if (offset < flash->mtd.size-(flash->mtd.size/64)) + status_new = (status_old & ~(SR_BP2|SR_BP0)) | SR_BP1; + else + status_new = (status_old & ~(SR_BP2|SR_BP1)) | SR_BP0; + + /* Only modify protection if it will not unlock other areas */ + if ((status_new&(SR_BP2|SR_BP1|SR_BP0)) > + (status_old&(SR_BP2|SR_BP1|SR_BP0))) { + write_enable(flash); + if (write_sr(flash, status_new) < 0) { + res = 1; + goto err; + } + } + +err: mutex_unlock(&flash->lock); + return res; +} + +static int m25p80_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) +{ + struct m25p *flash = mtd_to_m25p(mtd); + uint32_t offset = ofs; + uint8_t status_old, status_new; + int res = 0; + + mutex_lock(&flash->lock); + /* Wait until finished previous command */ + if (wait_till_ready(flash)) { + res = 1; + goto err; + } + + status_old = read_sr(flash); + + if (offset+len > flash->mtd.size-(flash->mtd.size/64)) + status_new = status_old & ~(SR_BP2|SR_BP1|SR_BP0); + else if (offset+len > flash->mtd.size-(flash->mtd.size/32)) + status_new = (status_old & ~(SR_BP2|SR_BP1)) | SR_BP0; + else if (offset+len > flash->mtd.size-(flash->mtd.size/16)) + status_new = (status_old & ~(SR_BP2|SR_BP0)) | SR_BP1; + else if (offset+len > flash->mtd.size-(flash->mtd.size/8)) + status_new = (status_old & ~SR_BP2) | SR_BP1 | SR_BP0; + else if (offset+len > flash->mtd.size-(flash->mtd.size/4)) + status_new = (status_old & ~(SR_BP0|SR_BP1)) | SR_BP2; + else if (offset+len > flash->mtd.size-(flash->mtd.size/2)) + status_new = (status_old & ~SR_BP1) | SR_BP2 | SR_BP0; + else + status_new = (status_old & ~SR_BP0) | SR_BP2 | SR_BP1; + + /* Only modify protection if it will not lock other areas */ + if ((status_new&(SR_BP2|SR_BP1|SR_BP0)) < + (status_old&(SR_BP2|SR_BP1|SR_BP0))) { + write_enable(flash); + if (write_sr(flash, status_new) < 0) { + res = 1; + goto err; + } + } + +err: mutex_unlock(&flash->lock); + return res; +} + /****************************************************************************/ /* @@ -642,6 +732,10 @@ static const struct spi_device_id m25p_ids[] = { /* Everspin */ { "mr25h256", CAT25_INFO( 32 * 1024, 1, 256, 2) }, + /* GigaDevice */ + { "gd25q32", INFO(0xc84016, 0, 64 * 1024, 64, SECT_4K) }, + { "gd25q64", INFO(0xc84017, 0, 64 * 1024, 128, SECT_4K) }, + /* Intel/Numonyx -- xxxs33b */ { "160s33b", INFO(0x898911, 0, 64 * 1024, 32, 0) }, { "320s33b", INFO(0x898912, 0, 64 * 1024, 64, 0) }, @@ -899,6 +993,12 @@ static int m25p_probe(struct spi_device *spi) flash->mtd._erase = m25p80_erase; flash->mtd._read = m25p80_read; + /* flash protection support for STmicro chips */ + if (JEDEC_MFR(info->jedec_id) == CFI_MFR_ST) { + flash->mtd._lock = m25p80_lock; + flash->mtd._unlock = m25p80_unlock; + } + /* sst flash chips use AAI word program */ if (JEDEC_MFR(info->jedec_id) == CFI_MFR_SST) flash->mtd._write = sst_write; |