diff options
Diffstat (limited to 'target/linux/rdc/files/drivers/mtd/maps/bifferboard-flash.c')
| -rw-r--r-- | target/linux/rdc/files/drivers/mtd/maps/bifferboard-flash.c | 243 |
1 files changed, 0 insertions, 243 deletions
diff --git a/target/linux/rdc/files/drivers/mtd/maps/bifferboard-flash.c b/target/linux/rdc/files/drivers/mtd/maps/bifferboard-flash.c deleted file mode 100644 index e732334e9..000000000 --- a/target/linux/rdc/files/drivers/mtd/maps/bifferboard-flash.c +++ /dev/null @@ -1,243 +0,0 @@ -/* Flash mapping for Bifferboard, (c) bifferos@yahoo.co.uk - * Works with 1, 4 and 8MB flash versions - */ - -#include <linux/delay.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/map.h> -#include <linux/mtd/partitions.h> - -#define DRV "bifferboard-flash: " - -static struct mtd_info *bb_mtd = NULL; - -#define SIZE_BIFFBOOT 0x10000 -#define SIZE_SECTOR 0x10000 -#define SIZE_CONFIG 0x02000 -#define SIZE_1MB 0x00100000 -#define SIZE_4MB 0x00400000 -#define SIZE_8MB 0x00800000 - -#define BASE_1MB 0xfff00000 -#define BASE_4MB 0xffc00000 -#define BASE_8MB 0xff800000 - -#define OFFS_KERNEL 0x6000 -#define OFFS_CONFIG 0x4000 - -/* - * Flash detection code. This is needed because the cfi_probe doesn't probe - * for the size correctly. You actually have to know the flash size before you - * call it, or so it seems. It does work correctly if you map the entire flash - * chip, but unsure of the implications for mapping more mem than exists. - */ - -static unsigned char ReadFlash(void* base, u32 addr) -{ - unsigned char val = *(volatile unsigned char *)(base+addr); - udelay(1); - return val; -} - -static void WriteFlash(void* base, u32 addr, unsigned short data) -{ - *(volatile unsigned short *)(base+addr) = data; -} - -static DEFINE_SPINLOCK(flash_lock); - -static u32 bb_detect(void) -{ - u32 ret = 0; - ulong flags; - - /* for detection, map in just the 1MB device, 1st 64k is enough */ - void* base = ioremap_nocache(BASE_1MB, 0x10000); - - if (!base) - { - pr_err(DRV "Failed to map flash for probing\n"); - return 0; - } - - spin_lock_irqsave(&flash_lock, flags); - - /* put flash in auto-detect mode */ - WriteFlash(base, 0xaaaa, 0xaaaa); - WriteFlash(base, 0x5554, 0x5555); - WriteFlash(base, 0xaaaa, 0x9090); - - /* Read the auto-config data - 4 values in total */ - ret = ReadFlash(base, 0x0000); ret <<= 8; - ret |= ReadFlash(base, 0x0200); ret <<= 8; - ret |= ReadFlash(base, 0x0003); ret <<= 8; - ret |= ReadFlash(base, 0x0002); - - /* exit the autodetect state */ - WriteFlash(base, 0x0000, 0xf0f0); - - spin_unlock_irqrestore(&flash_lock, flags); - - /* unmap it, it'll be re-mapped based on the detection */ - iounmap(base); - - return ret; -} - - -static struct map_info bb_map; - -/* Update the map, using the detected flash signature. */ -static int bb_adjust_map(unsigned long sig, struct map_info* m) -{ - m->bankwidth = 2; - switch (sig) - { - case 0x7f1c225b : - m->name = "ENLV800B"; - m->phys = BASE_1MB; - m->size = SIZE_1MB; - break; - case 0x7f1c22f9 : - m->name = "ENLV320B"; - m->phys = BASE_4MB; - m->size = SIZE_4MB; - break; - case 0x7f1c22cb : - m->name = "ENLV640B"; - m->phys = BASE_8MB; - m->size = SIZE_8MB; - break; - default: - return -ENXIO; - } - return 0; -} - - -/* adjust partition sizes, prior to adding the partition - * Values not specified by defines here are subject to replacement based on - * the real flash size. (0x00000000 being the exception, of course) */ - -static struct mtd_partition bb_parts[] = -{ -/* 0 */ { name: "kernel", offset: 0x00000000, size: 0x000fa000 }, -/* 1 */ { name: "rootfs", offset: MTDPART_OFS_APPEND, size: 0x002F0000 }, -/* 2 */ { name: "biffboot", offset: MTDPART_OFS_APPEND, size: MTDPART_SIZ_FULL, mask_flags: MTD_WRITEABLE }, -}; - - -/* returns the count of partitions to be used */ -static ulong bb_adjust_partitions(struct map_info* m) -{ - /* Read the kernel offset value, 1036 bytes into the config block. */ - u16 km_units = *((u16*)(m->virt + OFFS_CONFIG + 1036)); - u32 kernelmax = 0x200000; /* Biffboot 2.7 or earlier default */ - - /* special-case 1MB devices, because there are fewer partitions */ - if (m->size == SIZE_1MB) - { - bb_parts[0].size = SIZE_1MB - SIZE_BIFFBOOT; /* kernel */ - bb_parts[1].name = "biffboot"; /* biffboot */ - bb_parts[1].offset = MTDPART_OFS_APPEND; /* biffboot */ - bb_parts[1].size = MTDPART_SIZ_FULL; /* biffboot */ - bb_parts[1].mask_flags = MTD_WRITEABLE; - return 2; /* because there's no rootfs now */ - } - - /* sanity check */ - if (km_units > ((m->size-SIZE_BIFFBOOT)/SIZE_SECTOR)) - { - pr_err(DRV "config block has invalid kernelmax\n"); - return 0; - } - - kernelmax = km_units * SIZE_SECTOR; - - /* Kernel */ - bb_parts[0].size = kernelmax; - - /* rootfs */ - bb_parts[1].size = m->size - kernelmax - SIZE_BIFFBOOT; - - return 3; /* 3 partitions */ -} - - -static int __init init_bb_map(void) -{ - int ret; - ulong signature = bb_detect(); - ulong part_len; - - if (!signature) - { - pr_err(DRV "Undetected flash chip"); - return -ENXIO; - } - - ret = bb_adjust_map(signature, &bb_map); - - if (ret) - { - pr_err(DRV "Unrecognised flash chip (signature: 0x%lx)\n", signature); - return ret; - } - - bb_map.virt = ioremap_nocache(bb_map.phys, bb_map.size); - if (!bb_map.virt) - { - pr_err(DRV "ioremap\n"); - return -EIO; - } - - bb_mtd = do_map_probe("cfi_probe", &bb_map); - if (!bb_mtd) - { - /* cfi_probe fails here for 1MB devices */ - pr_err(DRV "cfi_probe\n"); - ret = -ENXIO; - goto err; - } - - part_len = bb_adjust_partitions(&bb_map); - if (!part_len) - { - pr_err(DRV "no partitions established"); - ret = -ENXIO; - goto err2; - } - - bb_mtd->owner = THIS_MODULE; - ret = add_mtd_partitions(bb_mtd, bb_parts, part_len); - if (ret) - { - pr_err(DRV "add_mtd_partitions\n"); - ret = -ENXIO; - goto err2; - } - - return 0; - -err2: - map_destroy(bb_mtd); -err: - iounmap(bb_map.virt); - - return ret; -} - -static void __exit exit_bb_map(void) -{ - del_mtd_partitions(bb_mtd); - map_destroy(bb_mtd); - iounmap(bb_map.virt); -} - -module_init(init_bb_map); -module_exit(exit_bb_map); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Bifferos <bifferos@yahoo.co.uk>"); -MODULE_DESCRIPTION("MTD map driver for Bifferboard"); - |