diff options
Diffstat (limited to 'arch/cris/arch-v32/drivers/axisflashmap.c')
| -rw-r--r-- | arch/cris/arch-v32/drivers/axisflashmap.c | 592 |
1 files changed, 0 insertions, 592 deletions
diff --git a/arch/cris/arch-v32/drivers/axisflashmap.c b/arch/cris/arch-v32/drivers/axisflashmap.c deleted file mode 100644 index 87656c41fec7..000000000000 --- a/arch/cris/arch-v32/drivers/axisflashmap.c +++ /dev/null @@ -1,592 +0,0 @@ -/* - * Physical mapping layer for MTD using the Axis partitiontable format - * - * Copyright (c) 2001-2007 Axis Communications AB - * - * This file is under the GPL. - * - * First partition is always sector 0 regardless of if we find a partitiontable - * or not. In the start of the next sector, there can be a partitiontable that - * tells us what other partitions to define. If there isn't, we use a default - * partition split defined below. - * - */ - -#include <linux/module.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/slab.h> - -#include <linux/mtd/concat.h> -#include <linux/mtd/map.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/mtdram.h> -#include <linux/mtd/partitions.h> - -#include <asm/axisflashmap.h> -#include <asm/mmu.h> - -#define MEM_CSE0_SIZE (0x04000000) -#define MEM_CSE1_SIZE (0x04000000) - -#define FLASH_UNCACHED_ADDR KSEG_E -#define FLASH_CACHED_ADDR KSEG_F - -#define PAGESIZE (512) - -#if CONFIG_ETRAX_FLASH_BUSWIDTH==1 -#define flash_data __u8 -#elif CONFIG_ETRAX_FLASH_BUSWIDTH==2 -#define flash_data __u16 -#elif CONFIG_ETRAX_FLASH_BUSWIDTH==4 -#define flash_data __u32 -#endif - -/* From head.S */ -extern unsigned long romfs_in_flash; /* 1 when romfs_start, _length in flash */ -extern unsigned long romfs_start, romfs_length; -extern unsigned long nand_boot; /* 1 when booted from nand flash */ - -struct partition_name { - char name[6]; -}; - -/* The master mtd for the entire flash. */ -struct mtd_info* axisflash_mtd = NULL; - -/* Map driver functions. */ - -static map_word flash_read(struct map_info *map, unsigned long ofs) -{ - map_word tmp; - tmp.x[0] = *(flash_data *)(map->map_priv_1 + ofs); - return tmp; -} - -static void flash_copy_from(struct map_info *map, void *to, - unsigned long from, ssize_t len) -{ - memcpy(to, (void *)(map->map_priv_1 + from), len); -} - -static void flash_write(struct map_info *map, map_word d, unsigned long adr) -{ - *(flash_data *)(map->map_priv_1 + adr) = (flash_data)d.x[0]; -} - -/* - * The map for chip select e0. - * - * We run into tricky coherence situations if we mix cached with uncached - * accesses to we only use the uncached version here. - * - * The size field is the total size where the flash chips may be mapped on the - * chip select. MTD probes should find all devices there and it does not matter - * if there are unmapped gaps or aliases (mirrors of flash devices). The MTD - * probes will ignore them. - * - * The start address in map_priv_1 is in virtual memory so we cannot use - * MEM_CSE0_START but must rely on that FLASH_UNCACHED_ADDR is the start - * address of cse0. - */ -static struct map_info map_cse0 = { - .name = "cse0", - .size = MEM_CSE0_SIZE, - .bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH, - .read = flash_read, - .copy_from = flash_copy_from, - .write = flash_write, - .map_priv_1 = FLASH_UNCACHED_ADDR -}; - -/* - * The map for chip select e1. - * - * If there was a gap between cse0 and cse1, map_priv_1 would get the wrong - * address, but there isn't. - */ -static struct map_info map_cse1 = { - .name = "cse1", - .size = MEM_CSE1_SIZE, - .bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH, - .read = flash_read, - .copy_from = flash_copy_from, - .write = flash_write, - .map_priv_1 = FLASH_UNCACHED_ADDR + MEM_CSE0_SIZE -}; - -#define MAX_PARTITIONS 7 -#ifdef CONFIG_ETRAX_NANDBOOT -#define NUM_DEFAULT_PARTITIONS 4 -#define DEFAULT_ROOTFS_PARTITION_NO 2 -#define DEFAULT_MEDIA_SIZE 0x2000000 /* 32 megs */ -#else -#define NUM_DEFAULT_PARTITIONS 3 -#define DEFAULT_ROOTFS_PARTITION_NO (-1) -#define DEFAULT_MEDIA_SIZE 0x800000 /* 8 megs */ -#endif - -#if (MAX_PARTITIONS < NUM_DEFAULT_PARTITIONS) -#error MAX_PARTITIONS must be >= than NUM_DEFAULT_PARTITIONS -#endif - -/* Initialize the ones normally used. */ -static struct mtd_partition axis_partitions[MAX_PARTITIONS] = { - { - .name = "part0", - .size = CONFIG_ETRAX_PTABLE_SECTOR, - .offset = 0 - }, - { - .name = "part1", - .size = 0, - .offset = 0 - }, - { - .name = "part2", - .size = 0, - .offset = 0 - }, - { - .name = "part3", - .size = 0, - .offset = 0 - }, - { - .name = "part4", - .size = 0, - .offset = 0 - }, - { - .name = "part5", - .size = 0, - .offset = 0 - }, - { - .name = "part6", - .size = 0, - .offset = 0 - }, -}; - - -/* If no partition-table was found, we use this default-set. - * Default flash size is 8MB (NOR). CONFIG_ETRAX_PTABLE_SECTOR is most - * likely the size of one flash block and "filesystem"-partition needs - * to be >=5 blocks to be able to use JFFS. - */ -static struct mtd_partition axis_default_partitions[NUM_DEFAULT_PARTITIONS] = { - { - .name = "boot firmware", - .size = CONFIG_ETRAX_PTABLE_SECTOR, - .offset = 0 - }, - { - .name = "kernel", - .size = 10 * CONFIG_ETRAX_PTABLE_SECTOR, - .offset = CONFIG_ETRAX_PTABLE_SECTOR - }, -#define FILESYSTEM_SECTOR (11 * CONFIG_ETRAX_PTABLE_SECTOR) -#ifdef CONFIG_ETRAX_NANDBOOT - { - .name = "rootfs", - .size = 10 * CONFIG_ETRAX_PTABLE_SECTOR, - .offset = FILESYSTEM_SECTOR - }, -#undef FILESYSTEM_SECTOR -#define FILESYSTEM_SECTOR (21 * CONFIG_ETRAX_PTABLE_SECTOR) -#endif - { - .name = "rwfs", - .size = DEFAULT_MEDIA_SIZE - FILESYSTEM_SECTOR, - .offset = FILESYSTEM_SECTOR - } -}; - -#ifdef CONFIG_ETRAX_AXISFLASHMAP_MTD0WHOLE -/* Main flash device */ -static struct mtd_partition main_partition = { - .name = "main", - .size = 0, - .offset = 0 -}; -#endif - -/* Auxiliary partition if we find another flash */ -static struct mtd_partition aux_partition = { - .name = "aux", - .size = 0, - .offset = 0 -}; - -/* - * Probe a chip select for AMD-compatible (JEDEC) or CFI-compatible flash - * chips in that order (because the amd_flash-driver is faster). - */ -static struct mtd_info *probe_cs(struct map_info *map_cs) -{ - struct mtd_info *mtd_cs = NULL; - - printk(KERN_INFO - "%s: Probing a 0x%08lx bytes large window at 0x%08lx.\n", - map_cs->name, map_cs->size, map_cs->map_priv_1); - -#ifdef CONFIG_MTD_CFI - mtd_cs = do_map_probe("cfi_probe", map_cs); -#endif -#ifdef CONFIG_MTD_JEDECPROBE - if (!mtd_cs) - mtd_cs = do_map_probe("jedec_probe", map_cs); -#endif - - return mtd_cs; -} - -/* - * Probe each chip select individually for flash chips. If there are chips on - * both cse0 and cse1, the mtd_info structs will be concatenated to one struct - * so that MTD partitions can cross chip boundaries. - * - * The only known restriction to how you can mount your chips is that each - * chip select must hold similar flash chips. But you need external hardware - * to do that anyway and you can put totally different chips on cse0 and cse1 - * so it isn't really much of a restriction. - */ -extern struct mtd_info* __init crisv32_nand_flash_probe (void); -static struct mtd_info *flash_probe(void) -{ - struct mtd_info *mtd_cse0; - struct mtd_info *mtd_cse1; - struct mtd_info *mtd_total; - struct mtd_info *mtds[2]; - int count = 0; - - if ((mtd_cse0 = probe_cs(&map_cse0)) != NULL) - mtds[count++] = mtd_cse0; - if ((mtd_cse1 = probe_cs(&map_cse1)) != NULL) - mtds[count++] = mtd_cse1; - - if (!mtd_cse0 && !mtd_cse1) { - /* No chip found. */ - return NULL; - } - - if (count > 1) { - /* Since the concatenation layer adds a small overhead we - * could try to figure out if the chips in cse0 and cse1 are - * identical and reprobe the whole cse0+cse1 window. But since - * flash chips are slow, the overhead is relatively small. - * So we use the MTD concatenation layer instead of further - * complicating the probing procedure. - */ - mtd_total = mtd_concat_create(mtds, count, "cse0+cse1"); - if (!mtd_total) { - printk(KERN_ERR "%s and %s: Concatenation failed!\n", - map_cse0.name, map_cse1.name); - - /* The best we can do now is to only use what we found - * at cse0. */ - mtd_total = mtd_cse0; - map_destroy(mtd_cse1); - } - } else - mtd_total = mtd_cse0 ? mtd_cse0 : mtd_cse1; - - return mtd_total; -} - -/* - * Probe the flash chip(s) and, if it succeeds, read the partition-table - * and register the partitions with MTD. - */ -static int __init init_axis_flash(void) -{ - struct mtd_info *main_mtd; - struct mtd_info *aux_mtd = NULL; - int err = 0; - int pidx = 0; - struct partitiontable_head *ptable_head = NULL; - struct partitiontable_entry *ptable; - int ptable_ok = 0; - static char page[PAGESIZE]; - size_t len; - int ram_rootfs_partition = -1; /* -1 => no RAM rootfs partition */ - int part; - struct mtd_partition *partition; - - /* We need a root fs. If it resides in RAM, we need to use an - * MTDRAM device, so it must be enabled in the kernel config, - * but its size must be configured as 0 so as not to conflict - * with our usage. - */ -#if !defined(CONFIG_MTD_MTDRAM) || (CONFIG_MTDRAM_TOTAL_SIZE != 0) - if (!romfs_in_flash && !nand_boot) { - printk(KERN_EMERG "axisflashmap: Cannot create an MTD RAM " - "device; configure CONFIG_MTD_MTDRAM with size = 0!\n"); - panic("This kernel cannot boot from RAM!\n"); - } -#endif - - main_mtd = flash_probe(); - if (main_mtd) - printk(KERN_INFO "%s: 0x%08llx bytes of NOR flash memory.\n", - main_mtd->name, main_mtd->size); - -#ifdef CONFIG_ETRAX_NANDFLASH - aux_mtd = crisv32_nand_flash_probe(); - if (aux_mtd) - printk(KERN_INFO "%s: 0x%08x bytes of NAND flash memory.\n", - aux_mtd->name, aux_mtd->size); - -#ifdef CONFIG_ETRAX_NANDBOOT - { - struct mtd_info *tmp_mtd; - - printk(KERN_INFO "axisflashmap: Set to boot from NAND flash, " - "making NAND flash primary device.\n"); - tmp_mtd = main_mtd; - main_mtd = aux_mtd; - aux_mtd = tmp_mtd; - } -#endif /* CONFIG_ETRAX_NANDBOOT */ -#endif /* CONFIG_ETRAX_NANDFLASH */ - - if (!main_mtd && !aux_mtd) { - /* There's no reason to use this module if no flash chip can - * be identified. Make sure that's understood. - */ - printk(KERN_INFO "axisflashmap: Found no flash chip.\n"); - } - -#if 0 /* Dump flash memory so we can see what is going on */ - if (main_mtd) { - int sectoraddr; - for (sectoraddr = 0; sectoraddr < 2*65536+4096; - sectoraddr += PAGESIZE) { - main_mtd->read(main_mtd, sectoraddr, PAGESIZE, &len, - page); - printk(KERN_INFO - "Sector at %d (length %d):\n", - sectoraddr, len); - print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, page, PAGESIZE, false); - } - } -#endif - - if (main_mtd) { - loff_t ptable_sector = CONFIG_ETRAX_PTABLE_SECTOR; - main_mtd->owner = THIS_MODULE; - axisflash_mtd = main_mtd; - - - /* First partition (rescue) is always set to the default. */ - pidx++; -#ifdef CONFIG_ETRAX_NANDBOOT - /* We know where the partition table should be located, - * it will be in first good block after that. - */ - int blockstat; - do { - blockstat = mtd_block_isbad(main_mtd, ptable_sector); - if (blockstat < 0) - ptable_sector = 0; /* read error */ - else if (blockstat) - ptable_sector += main_mtd->erasesize; - } while (blockstat && ptable_sector); -#endif - if (ptable_sector) { - mtd_read(main_mtd, ptable_sector, PAGESIZE, &len, - page); - ptable_head = &((struct partitiontable *) page)->head; - } - -#if 0 /* Dump partition table so we can see what is going on */ - printk(KERN_INFO - "axisflashmap: flash read %d bytes at 0x%08x, data: %8ph\n", - len, CONFIG_ETRAX_PTABLE_SECTOR, page); - printk(KERN_INFO - "axisflashmap: partition table offset %d, data: %8ph\n", - PARTITION_TABLE_OFFSET, page + PARTITION_TABLE_OFFSET); -#endif - } - - if (ptable_head && (ptable_head->magic == PARTITION_TABLE_MAGIC) - && (ptable_head->size < - (MAX_PARTITIONS * sizeof(struct partitiontable_entry) + - PARTITIONTABLE_END_MARKER_SIZE)) - && (*(unsigned long*)((void*)ptable_head + sizeof(*ptable_head) + - ptable_head->size - - PARTITIONTABLE_END_MARKER_SIZE) - == PARTITIONTABLE_END_MARKER)) { - /* Looks like a start, sane length and end of a - * partition table, lets check csum etc. - */ - struct partitiontable_entry *max_addr = - (struct partitiontable_entry *) - ((unsigned long)ptable_head + sizeof(*ptable_head) + - ptable_head->size); - unsigned long offset = CONFIG_ETRAX_PTABLE_SECTOR; - unsigned char *p; - unsigned long csum = 0; - - ptable = (struct partitiontable_entry *) - ((unsigned long)ptable_head + sizeof(*ptable_head)); - - /* Lets be PARANOID, and check the checksum. */ - p = (unsigned char*) ptable; - - while (p <= (unsigned char*)max_addr) { - csum += *p++; - csum += *p++; - csum += *p++; - csum += *p++; - } - ptable_ok = (csum == ptable_head->checksum); - - /* Read the entries and use/show the info. */ - printk(KERN_INFO "axisflashmap: " - "Found a%s partition table at 0x%p-0x%p.\n", - (ptable_ok ? " valid" : "n invalid"), ptable_head, - max_addr); - - /* We have found a working bootblock. Now read the - * partition table. Scan the table. It ends with 0xffffffff. - */ - while (ptable_ok - && ptable->offset != PARTITIONTABLE_END_MARKER - && ptable < max_addr - && pidx < MAX_PARTITIONS - 1) { - - axis_partitions[pidx].offset = offset + ptable->offset; -#ifdef CONFIG_ETRAX_NANDFLASH - if (main_mtd->type == MTD_NANDFLASH) { - axis_partitions[pidx].size = - (((ptable+1)->offset == - PARTITIONTABLE_END_MARKER) ? - main_mtd->size : - ((ptable+1)->offset + offset)) - - (ptable->offset + offset); - - } else -#endif /* CONFIG_ETRAX_NANDFLASH */ - axis_partitions[pidx].size = ptable->size; -#ifdef CONFIG_ETRAX_NANDBOOT - /* Save partition number of jffs2 ro partition. - * Needed if RAM booting or root file system in RAM. - */ - if (!nand_boot && - ram_rootfs_partition < 0 && /* not already set */ - ptable->type == PARTITION_TYPE_JFFS2 && - (ptable->flags & PARTITION_FLAGS_READONLY_MASK) == - PARTITION_FLAGS_READONLY) - ram_rootfs_partition = pidx; -#endif /* CONFIG_ETRAX_NANDBOOT */ - pidx++; - ptable++; - } - } - - /* Decide whether to use default partition table. */ - /* Only use default table if we actually have a device (main_mtd) */ - - partition = &axis_partitions[0]; - if (main_mtd && !ptable_ok) { - memcpy(axis_partitions, axis_default_partitions, - sizeof(axis_default_partitions)); - pidx = NUM_DEFAULT_PARTITIONS; - ram_rootfs_partition = DEFAULT_ROOTFS_PARTITION_NO; - } - - /* Add artificial partitions for rootfs if necessary */ - if (romfs_in_flash) { - /* rootfs is in directly accessible flash memory = NOR flash. - Add an overlapping device for the rootfs partition. */ - printk(KERN_INFO "axisflashmap: Adding partition for " - "overlapping root file system image\n"); - axis_partitions[pidx].size = romfs_length; - axis_partitions[pidx].offset = romfs_start - FLASH_CACHED_ADDR; - axis_partitions[pidx].name = "romfs"; - axis_partitions[pidx].mask_flags |= MTD_WRITEABLE; - ram_rootfs_partition = -1; - pidx++; - } else if (romfs_length && !nand_boot) { - /* romfs exists in memory, but not in flash, so must be in RAM. - * Configure an MTDRAM partition. */ - if (ram_rootfs_partition < 0) { - /* None set yet, put it at the end */ - ram_rootfs_partition = pidx; - pidx++; - } - printk(KERN_INFO "axisflashmap: Adding partition for " - "root file system image in RAM\n"); - axis_partitions[ram_rootfs_partition].size = romfs_length; - axis_partitions[ram_rootfs_partition].offset = romfs_start; - axis_partitions[ram_rootfs_partition].name = "romfs"; - axis_partitions[ram_rootfs_partition].mask_flags |= - MTD_WRITEABLE; - } - -#ifdef CONFIG_ETRAX_AXISFLASHMAP_MTD0WHOLE - if (main_mtd) { - main_partition.size = main_mtd->size; - err = mtd_device_register(main_mtd, &main_partition, 1); - if (err) - panic("axisflashmap: Could not initialize " - "partition for whole main mtd device!\n"); - } -#endif - - /* Now, register all partitions with mtd. - * We do this one at a time so we can slip in an MTDRAM device - * in the proper place if required. */ - - for (part = 0; part < pidx; part++) { - if (part == ram_rootfs_partition) { - /* add MTDRAM partition here */ - struct mtd_info *mtd_ram; - - mtd_ram = kmalloc(sizeof(struct mtd_info), GFP_KERNEL); - if (!mtd_ram) - panic("axisflashmap: Couldn't allocate memory " - "for mtd_info!\n"); - printk(KERN_INFO "axisflashmap: Adding RAM partition " - "for rootfs image.\n"); - err = mtdram_init_device(mtd_ram, - (void *)(u_int32_t)partition[part].offset, - partition[part].size, - partition[part].name); - if (err) - panic("axisflashmap: Could not initialize " - "MTD RAM device!\n"); - /* JFFS2 likes to have an erasesize. Keep potential - * JFFS2 rootfs happy by providing one. Since image - * was most likely created for main mtd, use that - * erasesize, if available. Otherwise, make a guess. */ - mtd_ram->erasesize = (main_mtd ? main_mtd->erasesize : - CONFIG_ETRAX_PTABLE_SECTOR); - } else { - err = mtd_device_register(main_mtd, &partition[part], - 1); - if (err) - panic("axisflashmap: Could not add mtd " - "partition %d\n", part); - } - } - - if (aux_mtd) { - aux_partition.size = aux_mtd->size; - err = mtd_device_register(aux_mtd, &aux_partition, 1); - if (err) - panic("axisflashmap: Could not initialize " - "aux mtd device!\n"); - - } - - return err; -} - -/* This adds the above to the kernels init-call chain. */ -module_init(init_axis_flash); - -EXPORT_SYMBOL(axisflash_mtd); |