diff options
Diffstat (limited to 'target/linux/ar71xx/files/drivers/mtd/maps')
| -rw-r--r-- | target/linux/ar71xx/files/drivers/mtd/maps/ar91xx_flash.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/target/linux/ar71xx/files/drivers/mtd/maps/ar91xx_flash.c b/target/linux/ar71xx/files/drivers/mtd/maps/ar91xx_flash.c new file mode 100644 index 000000000..e83a1477f --- /dev/null +++ b/target/linux/ar71xx/files/drivers/mtd/maps/ar91xx_flash.c @@ -0,0 +1,268 @@ +/* + * Parallel flash driver for the Atheros AR91xx SoC + * + * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> +#include <linux/io.h> + +#include <asm/mach-ar71xx/ar71xx.h> +#include <asm/mach-ar71xx/platform.h> + +#define DRV_NAME "ar91xx-flash" + +struct ar91xx_flash_info { + struct mtd_info *mtd; + struct map_info map; +#ifdef CONFIG_MTD_PARTITIONS + int nr_parts; + struct mtd_partition *parts; +#endif +}; + +static map_word ar91xx_flash_read(struct map_info *map, unsigned long ofs) +{ + map_word val; + + if (map_bankwidth_is_1(map)) + val.x[0] = __raw_readb(map->virt + (ofs ^ 3)); + else if (map_bankwidth_is_2(map)) + val.x[0] = __raw_readw(map->virt + (ofs ^ 2)); + else + val = map_word_ff(map); + + return val; +} + +static void ar91xx_flash_write(struct map_info *map, map_word d, + unsigned long ofs) +{ + if (map_bankwidth_is_1(map)) + __raw_writeb(d.x[0], map->virt + (ofs ^ 3)); + else if (map_bankwidth_is_2(map)) + __raw_writew(d.x[0], map->virt + (ofs ^ 2)); + + mb(); +} + +static int ar91xx_flash_remove(struct platform_device *pdev) +{ + struct ar91xx_flash_platform_data *pdata; + struct ar91xx_flash_info *info; + + info = platform_get_drvdata(pdev); + if (info == NULL) + return 0; + + platform_set_drvdata(pdev, NULL); + + if (info->mtd == NULL) + return 0; + + pdata = pdev->dev.platform_data; +#ifdef CONFIG_MTD_PARTITIONS + if (info->nr_parts) { + del_mtd_partitions(info->mtd); + kfree(info->parts); + } else if (pdata->nr_parts) { + del_mtd_partitions(info->mtd); + } else { + del_mtd_device(info->mtd); + } +#else + del_mtd_device(info->mtd); +#endif + map_destroy(info->mtd); + + return 0; +} + +static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL }; +#ifdef CONFIG_MTD_PARTITIONS +static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL }; +#endif + +static int ar91xx_flash_probe(struct platform_device *pdev) +{ + struct ar91xx_flash_platform_data *pdata; + struct ar91xx_flash_info *info; + struct resource *res; + struct resource *region; + const char **probe_type; + int err = 0; + + pdata = pdev->dev.platform_data; + if (pdata == NULL) + return -EINVAL; + + info = devm_kzalloc(&pdev->dev, sizeof(struct ar91xx_flash_info), + GFP_KERNEL); + if (info == NULL) { + err = -ENOMEM; + goto err_out; + } + + platform_set_drvdata(pdev, info); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (res == NULL) { + err = -ENOENT; + goto err_out; + } + + dev_info(&pdev->dev, "%.8llx at %.8llx\n", + (unsigned long long)(res->end - res->start + 1), + (unsigned long long)res->start); + + region = devm_request_mem_region(&pdev->dev, + res->start, res->end - res->start + 1, + dev_name(&pdev->dev)); + if (region == NULL) { + dev_err(&pdev->dev, "could not reserve memory region\n"); + err = -ENOMEM; + goto err_out; + } + + info->map.name = dev_name(&pdev->dev); + info->map.phys = res->start; + info->map.size = res->end - res->start + 1; + info->map.bankwidth = pdata->width; + + info->map.virt = devm_ioremap(&pdev->dev, info->map.phys, + info->map.size); + if (info->map.virt == NULL) { + dev_err(&pdev->dev, "failed to ioremap flash region\n"); + err = -EIO; + goto err_out; + } + + simple_map_init(&info->map); + info->map.read = ar91xx_flash_read; + info->map.write = ar91xx_flash_write; + + probe_type = rom_probe_types; + for (; info->mtd == NULL && *probe_type != NULL; probe_type++) + info->mtd = do_map_probe(*probe_type, &info->map); + + if (info->mtd == NULL) { + dev_err(&pdev->dev, "map_probe failed\n"); + err = -ENXIO; + goto err_out; + } + + info->mtd->owner = THIS_MODULE; + +#ifdef CONFIG_MTD_PARTITIONS + if (pdata->nr_parts) { + dev_info(&pdev->dev, "using static partition mapping\n"); + add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts); + return 0; + } + + err = parse_mtd_partitions(info->mtd, part_probe_types, + &info->parts, 0); + if (err > 0) { + add_mtd_partitions(info->mtd, info->parts, err); + return 0; + } +#endif + + add_mtd_device(info->mtd); + return 0; + + err_out: + ar91xx_flash_remove(pdev); + return err; +} + +#ifdef CONFIG_PM +static int ar91xx_flash_suspend(struct platform_device *dev, pm_message_t state) +{ + struct ar91xx_flash_info *info = platform_get_drvdata(dev); + int ret = 0; + + if (info->mtd->suspend) + ret = info->mtd->suspend(info->mtd); + + if (ret) + goto fail; + + return 0; + + fail: + if (info->mtd->suspend) { + BUG_ON(!info->mtd->resume); + info->mtd->resume(info->mtd); + } + + return ret; +} + +static int ar91xx_flash_resume(struct platform_device *pdev) +{ + struct ar91xx_flash_info *info = platform_get_drvdata(pdev); + + if (info->mtd->resume) + info->mtd->resume(info->mtd); + + return 0; +} + +static void ar91xx_flash_shutdown(struct platform_device *pdev) +{ + struct ar91xx_flash_info *info = platform_get_drvdata(pdev); + + if (info->mtd->suspend && info->mtd->resume) + if (info->mtd->suspend(info->mtd) == 0) + info->mtd->resume(info->mtd); +} +#else +#define ar91xx_flash_suspend NULL +#define ar91xx_flash_resume NULL +#define ar91xx_flash_shutdown NULL +#endif + +static struct platform_driver ar91xx_flash_driver = { + .probe = ar91xx_flash_probe, + .remove = ar91xx_flash_remove, + .suspend = ar91xx_flash_suspend, + .resume = ar91xx_flash_resume, + .shutdown = ar91xx_flash_shutdown, + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, +}; + +static int __init ar91xx_flash_init(void) +{ + return platform_driver_register(&ar91xx_flash_driver); +} + +static void __exit ar91xx_flash_exit(void) +{ + platform_driver_unregister(&ar91xx_flash_driver); +} + +module_init(ar91xx_flash_init); +module_exit(ar91xx_flash_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); +MODULE_DESCRIPTION("Parallel flash driver for the Atheros AR91xx SoC"); +MODULE_ALIAS("platform:" DRV_NAME); |