From 8a6398687998886c451c6df381c2320b6dddb3fe Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Sun, 17 Jul 2011 14:55:45 +0200 Subject: [PATCH 16/22] mtd: bcm47xx: add serial flash driver Signed-off-by: Hauke Mehrtens --- drivers/mtd/maps/Kconfig | 9 ++ drivers/mtd/maps/Makefile | 1 + drivers/mtd/maps/bcm47xx-sflash.c | 270 +++++++++++++++++++++++++++++++++++++ 3 files changed, 280 insertions(+), 0 deletions(-) create mode 100644 drivers/mtd/maps/bcm47xx-sflash.c --- a/drivers/mtd/maps/Kconfig +++ b/drivers/mtd/maps/Kconfig @@ -273,6 +273,15 @@ config MTD_BCM47XX_PFLASH help Support for bcm47xx parallel flash +config MTD_BCM47XX_SFLASH + tristate "bcm47xx serial flash support" + default y + depends on BCM47XX + select MTD_PARTITIONS + select MTD_BCM47XX_PARTS + help + Support for bcm47xx parallel flash + config MTD_DILNETPC tristate "CFI Flash device mapped on DIL/Net PC" depends on X86 && MTD_CFI_INTELEXT && BROKEN --- a/drivers/mtd/maps/Makefile +++ b/drivers/mtd/maps/Makefile @@ -61,3 +61,4 @@ obj-$(CONFIG_MTD_BCM963XX) += bcm963xx-f obj-$(CONFIG_MTD_LATCH_ADDR) += latch-addr-flash.o obj-$(CONFIG_MTD_LANTIQ) += lantiq-flash.o obj-$(CONFIG_MTD_BCM47XX_PFLASH)+= bcm47xx-pflash.o +obj-$(CONFIG_MTD_BCM47XX_SFLASH)+= bcm47xx-sflash.o --- /dev/null +++ b/drivers/mtd/maps/bcm47xx-sflash.c @@ -0,0 +1,270 @@ +/* + * Broadcom SiliconBackplane chipcommon serial flash interface + * + * Copyright 2006, Broadcom Corporation + * All Rights Reserved. + * + * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY + * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM + * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS + * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE. + * + * $Id$ + */ + +#define pr_fmt(fmt) "bcm47xx_sflash: " fmt +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include +#include + +struct sflash_mtd { + struct bcma_drv_cc *cc; + struct mtd_info mtd; + struct mtd_erase_region_info region; +}; + +static struct sflash_mtd *sflash; + +static int +sflash_mtd_poll(struct sflash_mtd *sflash, unsigned int offset, int timeout) +{ + unsigned long now = jiffies; + int ret = 0; + + for (;;) { + if (!bcma_sflash_poll(sflash->cc, offset)) { + ret = 0; + break; + } + if (time_after(jiffies, now + timeout)) { + pr_err("timeout while polling\n"); + ret = -ETIMEDOUT; + break; + } + udelay(1); + } + + return ret; +} + +static int +sflash_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) +{ + struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv; + + /* Check address range */ + if (!len) + return 0; + + if ((from + len) > mtd->size) + return -EINVAL; + + *retlen = 0; + + while (len) { + int ret = bcma_sflash_read(sflash->cc, from, len, buf); + if (ret < 0) + return ret; + + from += (loff_t) ret; + len -= ret; + buf += ret; + *retlen += ret; + } + + return 0; +} + +static int +sflash_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) +{ + struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv; + + /* Check address range */ + if (!len) + return 0; + + if ((to + len) > mtd->size) + return -EINVAL; + + *retlen = 0; + while (len) { + int bytes; + int ret = bcma_sflash_write(sflash->cc, to, len, buf); + if (ret < 0) + return ret; + + bytes = ret; + + ret = sflash_mtd_poll(sflash, (unsigned int) to, HZ / 10); + if (ret) + return ret; + + to += (loff_t) bytes; + len -= bytes; + buf += bytes; + *retlen += bytes; + } + + return 0; +} + +static int +sflash_mtd_erase(struct mtd_info *mtd, struct erase_info *erase) +{ + struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv; + int i, j, ret = 0; + unsigned int addr, len; + + /* Check address range */ + if (!erase->len) + return 0; + if ((erase->addr + erase->len) > mtd->size) + return -EINVAL; + + addr = erase->addr; + len = erase->len; + + /* Ensure that requested regions are aligned */ + for (i = 0; i < mtd->numeraseregions; i++) { + for (j = 0; j < mtd->eraseregions[i].numblocks; j++) { + if (addr == mtd->eraseregions[i].offset + + mtd->eraseregions[i].erasesize * j && + len >= mtd->eraseregions[i].erasesize) { + if ((ret = bcma_sflash_erase(sflash->cc, addr)) < 0) + break; + if ((ret = sflash_mtd_poll(sflash, addr, 10 * HZ))) + break; + addr += mtd->eraseregions[i].erasesize; + len -= mtd->eraseregions[i].erasesize; + } + } + if (ret) + break; + } + + /* Set erase status */ + if (ret) + erase->state = MTD_ERASE_FAILED; + else + erase->state = MTD_ERASE_DONE; + + /* Call erase callback */ + if (erase->callback) + erase->callback(erase); + + return ret; +} + +static const char *probes[] = { "bcm47xx", NULL }; + +static int bcm47xx_sflash_probe(struct platform_device *pdev) +{ + int ret = 0; + + struct mtd_partition *parts; + int num_partitions = 0; + + sflash = kzalloc(sizeof(struct sflash_mtd), GFP_KERNEL); + if (!sflash) + return -ENOMEM; + + sflash->cc = &bcm47xx_bus.bcma.bus.drv_cc; + if (sflash->cc->flash_type != BCMA_SFLASH) + return -ENODEV; + + pr_info("found serial flash: blocksize=%dKB, numblocks=%d, size=%dKB\n", + sflash->cc->flash.sflash.blocksize/1024, + sflash->cc->flash.sflash.numblocks, + sflash->cc->flash.sflash.size/1024); + + /* Setup region info */ + sflash->region.offset = 0; + sflash->region.erasesize = sflash->cc->flash.sflash.blocksize; + sflash->region.numblocks = sflash->cc->flash.sflash.numblocks; + if (sflash->region.erasesize > sflash->mtd.erasesize) + sflash->mtd.erasesize = sflash->region.erasesize; + sflash->mtd.size = sflash->cc->flash.sflash.size; + sflash->mtd.numeraseregions = 1; + + /* Register with MTD */ + sflash->mtd.name = "bcm47xx-sflash"; + sflash->mtd.type = MTD_NORFLASH; + sflash->mtd.flags = MTD_CAP_NORFLASH; + sflash->mtd.eraseregions = &sflash->region; + sflash->mtd.erase = sflash_mtd_erase; + sflash->mtd.read = sflash_mtd_read; + sflash->mtd.write = sflash_mtd_write; + sflash->mtd.writesize = 1; + sflash->mtd.priv = sflash; + sflash->mtd.owner = THIS_MODULE; + + num_partitions = parse_mtd_partitions(&sflash->mtd, probes, &parts, 0); + if (num_partitions < 0) { + ret = num_partitions; + goto err_destroy; + } + + ret = mtd_device_register(&sflash->mtd, parts, num_partitions); + +// ret = mtd_device_parse_register(bcm47xx_mtd, "bcm47xx", NULL, NULL, 0); + + if (ret) { + pr_err("mtd_device_register failed\n"); + return ret; + } + return 0; + +err_destroy: + map_destroy(&sflash->mtd); + return ret; +} + +static int __devexit bcm47xx_sflash_remove(struct platform_device *pdev) +{ + if (sflash) { + mtd_device_unregister(&sflash->mtd); + map_destroy(&sflash->mtd); + } + return 0; +} + +static struct platform_driver bcm47xx_sflash_driver = { + .remove = __devexit_p(bcm47xx_sflash_remove), + .driver = { + .name = "bcm47xx_sflash", + .owner = THIS_MODULE, + }, +}; + +static int __init init_bcm47xx_sflash(void) +{ + int ret = platform_driver_probe(&bcm47xx_sflash_driver, bcm47xx_sflash_probe); + + if (ret) + pr_err("error registering platform driver: %i\n", ret); + return ret; +} + +static void __exit exit_bcm47xx_sflash(void) +{ + platform_driver_unregister(&bcm47xx_sflash_driver); +} + +module_init(init_bcm47xx_sflash); +module_exit(exit_bcm47xx_sflash); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("BCM47XX parallel flash driver");