diff options
Diffstat (limited to 'package/linux/kernel-source/drivers/mtd/maps/bcm947xx-flash.c')
| -rw-r--r-- | package/linux/kernel-source/drivers/mtd/maps/bcm947xx-flash.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/package/linux/kernel-source/drivers/mtd/maps/bcm947xx-flash.c b/package/linux/kernel-source/drivers/mtd/maps/bcm947xx-flash.c new file mode 100644 index 0000000000..716867ff1a --- /dev/null +++ b/package/linux/kernel-source/drivers/mtd/maps/bcm947xx-flash.c @@ -0,0 +1,236 @@ +/* + * Flash mapping for BCM947XX boards + * + * Copyright 2004, 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. + * + * $Id$ + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <asm/io.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> +#include <linux/config.h> + +#include <typedefs.h> +#include <bcmnvram.h> +#include <bcmutils.h> +#include <sbconfig.h> +#include <sbchipc.h> +#include <sbutils.h> +#include <trxhdr.h> + +/* Global SB handle */ +extern void *bcm947xx_sbh; +extern spinlock_t bcm947xx_sbh_lock; + +/* Convenience */ +#define sbh bcm947xx_sbh +#define sbh_lock bcm947xx_sbh_lock + +#ifdef CONFIG_MTD_PARTITIONS +extern struct mtd_partition * init_mtd_partitions(struct mtd_info *mtd, size_t size); +#endif + +#define WINDOW_ADDR 0x1fc00000 +#define WINDOW_SIZE 0x400000 +#define BUSWIDTH 2 + +/* e.g., flash=2M or flash=4M */ +static int flash = 0; +MODULE_PARM(flash, "i"); +static int __init +bcm947xx_setup(char *str) +{ + flash = memparse(str, &str); + return 1; +} +__setup("flash=", bcm947xx_setup); + +static struct mtd_info *bcm947xx_mtd; + +__u8 bcm947xx_map_read8(struct map_info *map, unsigned long ofs) +{ + if (map->map_priv_2 == 1) + return __raw_readb(map->map_priv_1 + ofs); + + u16 val = __raw_readw(map->map_priv_1 + (ofs & ~1)); + if (ofs & 1) + return ((val >> 8) & 0xff); + else + return (val & 0xff); +} + +__u16 bcm947xx_map_read16(struct map_info *map, unsigned long ofs) +{ + return __raw_readw(map->map_priv_1 + ofs); +} + +__u32 bcm947xx_map_read32(struct map_info *map, unsigned long ofs) +{ + return __raw_readl(map->map_priv_1 + ofs); +} + +void bcm947xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) +{ + if (len==1) { + memcpy_fromio(to, map->map_priv_1 + from, len); + } else { + int i; + u16 *dest = (u16 *) to; + u16 *src = (u16 *) (map->map_priv_1 + from); + for (i = 0; i < (len / 2); i++) { + dest[i] = src[i]; + } + if (len & 1) + *((u8 *)dest+len-1) = src[i] & 0xff; + } +} + +void bcm947xx_map_write8(struct map_info *map, __u8 d, unsigned long adr) +{ + __raw_writeb(d, map->map_priv_1 + adr); + mb(); +} + +void bcm947xx_map_write16(struct map_info *map, __u16 d, unsigned long adr) +{ + __raw_writew(d, map->map_priv_1 + adr); + mb(); +} + +void bcm947xx_map_write32(struct map_info *map, __u32 d, unsigned long adr) +{ + __raw_writel(d, map->map_priv_1 + adr); + mb(); +} + +void bcm947xx_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) +{ + memcpy_toio(map->map_priv_1 + to, from, len); +} + +struct map_info bcm947xx_map = { + name: "Physically mapped flash", + size: WINDOW_SIZE, + buswidth: BUSWIDTH, + read8: bcm947xx_map_read8, + read16: bcm947xx_map_read16, + read32: bcm947xx_map_read32, + copy_from: bcm947xx_map_copy_from, + write8: bcm947xx_map_write8, + write16: bcm947xx_map_write16, + write32: bcm947xx_map_write32, + copy_to: bcm947xx_map_copy_to +}; + +#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE) +#define init_bcm947xx_map init_module +#define cleanup_bcm947xx_map cleanup_module +#endif + +mod_init_t init_bcm947xx_map(void) +{ + ulong flags; + uint coreidx; + chipcregs_t *cc; + uint32 fltype; + uint window_addr = 0, window_size = 0; + size_t size; + int ret = 0; +#ifdef CONFIG_MTD_PARTITIONS + struct mtd_partition *parts; + int i; +#endif + + spin_lock_irqsave(&sbh_lock, flags); + coreidx = sb_coreidx(sbh); + + /* Check strapping option if chipcommon exists */ + if ((cc = sb_setcore(sbh, SB_CC, 0))) { + fltype = readl(&cc->capabilities) & CAP_FLASH_MASK; + if (fltype == PFLASH) { + bcm947xx_map.map_priv_2 = 1; + window_addr = 0x1c000000; + bcm947xx_map.size = window_size = 32 * 1024 * 1024; + if ((readl(&cc->flash_config) & CC_CFG_DS) == 0) + bcm947xx_map.buswidth = 1; + } + } else { + fltype = PFLASH; + bcm947xx_map.map_priv_2 = 0; + window_addr = WINDOW_ADDR; + window_size = WINDOW_SIZE; + } + + sb_setcoreidx(sbh, coreidx); + spin_unlock_irqrestore(&sbh_lock, flags); + + if (fltype != PFLASH) { + printk(KERN_ERR "pflash: found no supported devices\n"); + ret = -ENODEV; + goto fail; + } + + bcm947xx_map.map_priv_1 = (unsigned long) ioremap(window_addr, window_size); + if (!bcm947xx_map.map_priv_1) { + printk(KERN_ERR "pflash: ioremap failed\n"); + ret = -EIO; + goto fail; + } + + if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) { + printk(KERN_ERR "pflash: cfi_probe failed\n"); + ret = -ENXIO; + goto fail; + } + + bcm947xx_mtd->module = THIS_MODULE; + + /* Allow size override for testing */ + size = flash ? : bcm947xx_mtd->size; + + printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, window_addr); + +#ifdef CONFIG_MTD_PARTITIONS + parts = init_mtd_partitions(bcm947xx_mtd, size); + for (i = 0; parts[i].name; i++); + ret = add_mtd_partitions(bcm947xx_mtd, parts, i); + if (ret) { + printk(KERN_ERR "pflash: add_mtd_partitions failed\n"); + goto fail; + } +#endif + + return 0; + + fail: + if (bcm947xx_mtd) + map_destroy(bcm947xx_mtd); + if (bcm947xx_map.map_priv_1) + iounmap((void *) bcm947xx_map.map_priv_1); + bcm947xx_map.map_priv_1 = 0; + return ret; +} + +mod_exit_t cleanup_bcm947xx_map(void) +{ +#ifdef CONFIG_MTD_PARTITIONS + del_mtd_partitions(bcm947xx_mtd); +#endif + map_destroy(bcm947xx_mtd); + iounmap((void *) bcm947xx_map.map_priv_1); + bcm947xx_map.map_priv_1 = 0; +} + +module_init(init_bcm947xx_map); +module_exit(cleanup_bcm947xx_map); |