| /* |
| * Physical mapping layer for MTD using the Axis partitiontable format |
| * |
| * Copyright (c) 2001, 2002 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. |
| * |
| * $Log: axisflashmap.c,v $ |
| * Revision 1.31 2003/11/14 16:55:27 jonashg |
| * Made it possible to RAM boot without any flash drivers present. |
| * |
| * Revision 1.30 2003/09/29 06:37:18 mikaelp |
| * Exported master mtd device as axisflash_mtd. |
| * |
| * Revision 1.29 2003/04/01 14:12:06 starvik |
| * Added loglevel for lots of printks |
| * |
| * Revision 1.28 2002/10/01 08:08:43 jonashg |
| * The first partition ends at the start of the partition table. |
| * |
| * Revision 1.27 2002/08/21 09:23:13 jonashg |
| * Speling. |
| * |
| * Revision 1.26 2002/08/21 08:35:20 jonashg |
| * Cosmetic change to printouts. |
| * |
| * Revision 1.25 2002/08/21 08:15:42 jonashg |
| * Made it compile even without CONFIG_MTD_CONCAT defined. |
| * |
| * Revision 1.24 2002/08/20 13:12:35 jonashg |
| * * New approach to probing. Probe cse0 and cse1 separately and (mtd)concat |
| * the results. |
| * * Removed compile time tests concerning how the mtdram driver has been |
| * configured. The user will know about the misconfiguration at runtime |
| * instead. (The old approach made it impossible to use mtdram for anything |
| * else than RAM boot). |
| * |
| * Revision 1.23 2002/05/13 12:12:28 johana |
| * Allow compile without CONFIG_MTD_MTDRAM but warn at compiletime and |
| * be informative at runtime. |
| * |
| * Revision 1.22 2002/05/13 10:24:44 johana |
| * Added #if checks on MTDRAM CONFIG |
| * |
| * Revision 1.21 2002/05/06 16:05:20 johana |
| * Removed debug printout. |
| * |
| * Revision 1.20 2002/05/06 16:03:00 johana |
| * No more cramfs as root hack in generic code. |
| * It's handled by axisflashmap using mtdram. |
| * |
| * Revision 1.19 2002/03/15 17:10:28 bjornw |
| * Changed comment about cached access since we changed this before |
| * |
| * Revision 1.18 2002/03/05 17:06:15 jonashg |
| * Try amd_flash probe before cfi_probe since amd_flash driver can handle two |
| * (or more) flash chips of different model and the cfi driver cannot. |
| * |
| * Revision 1.17 2001/11/12 19:42:38 pkj |
| * Fixed compiler warnings. |
| * |
| * Revision 1.16 2001/11/08 11:18:58 jonashg |
| * Always read from uncached address to avoid problems with flushing |
| * cachelines after write and MTD-erase. No performance loss have been |
| * seen yet. |
| * |
| * Revision 1.15 2001/10/19 12:41:04 jonashg |
| * Name of probe has changed in MTD. |
| * |
| * Revision 1.14 2001/09/21 07:14:10 jonashg |
| * Made root filesystem (cramfs) use mtdblock driver when booting from flash. |
| * |
| * Revision 1.13 2001/08/15 13:57:35 jonashg |
| * Entire MTD updated to the linux 2.4.7 version. |
| * |
| * Revision 1.12 2001/06/11 09:50:30 jonashg |
| * Oops, 2MB is 0x200000 bytes. |
| * |
| * Revision 1.11 2001/06/08 11:39:44 jonashg |
| * Changed sizes and offsets in axis_default_partitions to use |
| * CONFIG_ETRAX_PTABLE_SECTOR. |
| * |
| * Revision 1.10 2001/05/29 09:42:03 jonashg |
| * Use macro for end marker length instead of sizeof. |
| * |
| * Revision 1.9 2001/05/29 08:52:52 jonashg |
| * Gave names to the magic fours (size of the ptable end marker). |
| * |
| * Revision 1.8 2001/05/28 15:36:20 jonashg |
| * * Removed old comment about ptable location in flash (it's a CONFIG_ option). |
| * * Variable ptable was initialized twice to the same value. |
| * |
| * Revision 1.7 2001/04/05 13:41:46 markusl |
| * Updated according to review remarks |
| * |
| * Revision 1.6 2001/03/07 09:21:21 bjornw |
| * No need to waste .data |
| * |
| * Revision 1.5 2001/03/06 16:27:01 jonashg |
| * Probe the entire flash area for flash devices. |
| * |
| * Revision 1.4 2001/02/23 12:47:15 bjornw |
| * Uncached flash in LOW_MAP moved from 0xe to 0x8 |
| * |
| * Revision 1.3 2001/02/16 12:11:45 jonashg |
| * MTD driver amd_flash is now included in MTD CVS repository. |
| * (It's now in drivers/mtd). |
| * |
| * Revision 1.2 2001/02/09 11:12:22 jonashg |
| * Support for AMD compatible non-CFI flash chips. |
| * Only tested with Toshiba TC58FVT160 so far. |
| * |
| * Revision 1.1 2001/01/12 17:01:18 bjornw |
| * * Added axisflashmap.c, a physical mapping for MTD that reads and understands |
| * Axis partition-table format. |
| * |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/config.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> |
| #include <asm/sv_addr_ag.h> |
| |
| #ifdef CONFIG_CRIS_LOW_MAP |
| #define FLASH_UNCACHED_ADDR KSEG_8 |
| #define FLASH_CACHED_ADDR KSEG_5 |
| #else |
| #define FLASH_UNCACHED_ADDR KSEG_E |
| #define FLASH_CACHED_ADDR KSEG_F |
| #endif |
| |
| /* From head.S */ |
| extern unsigned long romfs_start, romfs_length, romfs_in_flash; |
| |
| /* The master mtd for the entire flash. */ |
| struct mtd_info* axisflash_mtd = NULL; |
| |
| /* Map driver functions. */ |
| |
| static __u8 flash_read8(struct map_info *map, unsigned long ofs) |
| { |
| return *(__u8 *)(map->map_priv_1 + ofs); |
| } |
| |
| static __u16 flash_read16(struct map_info *map, unsigned long ofs) |
| { |
| return *(__u16 *)(map->map_priv_1 + ofs); |
| } |
| |
| static __u32 flash_read32(struct map_info *map, unsigned long ofs) |
| { |
| return *(volatile unsigned int *)(map->map_priv_1 + ofs); |
| } |
| |
| 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_write8(struct map_info *map, __u8 d, unsigned long adr) |
| { |
| *(__u8 *)(map->map_priv_1 + adr) = d; |
| } |
| |
| static void flash_write16(struct map_info *map, __u16 d, unsigned long adr) |
| { |
| *(__u16 *)(map->map_priv_1 + adr) = d; |
| } |
| |
| static void flash_write32(struct map_info *map, __u32 d, unsigned long adr) |
| { |
| *(__u32 *)(map->map_priv_1 + adr) = d; |
| } |
| |
| /* |
| * 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, |
| buswidth: CONFIG_ETRAX_FLASH_BUSWIDTH, |
| read8: flash_read8, |
| read16: flash_read16, |
| read32: flash_read32, |
| copy_from: flash_copy_from, |
| write8: flash_write8, |
| write16: flash_write16, |
| write32: flash_write32, |
| 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, |
| buswidth: CONFIG_ETRAX_FLASH_BUSWIDTH, |
| read8: flash_read8, |
| read16: flash_read16, |
| read32: flash_read32, |
| copy_from: flash_copy_from, |
| write8: flash_write8, |
| write16: flash_write16, |
| write32: flash_write32, |
| map_priv_1: FLASH_UNCACHED_ADDR + MEM_CSE0_SIZE |
| }; |
| |
| /* If no partition-table was found, we use this default-set. */ |
| #define MAX_PARTITIONS 7 |
| #define NUM_DEFAULT_PARTITIONS 3 |
| |
| /* |
| * Default flash size is 2MB. CONFIG_ETRAX_PTABLE_SECTOR is most likely the |
| * size of one flash block and "filesystem"-partition needs 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: 0x200000 - (6 * CONFIG_ETRAX_PTABLE_SECTOR), |
| offset: CONFIG_ETRAX_PTABLE_SECTOR |
| }, |
| { |
| name: "filesystem", |
| size: 5 * CONFIG_ETRAX_PTABLE_SECTOR, |
| offset: 0x200000 - (5 * CONFIG_ETRAX_PTABLE_SECTOR) |
| } |
| }; |
| |
| /* 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 |
| }, |
| }; |
| |
| /* |
| * 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_AMDSTD |
| mtd_cs = do_map_probe("amd_flash", map_cs); |
| #endif |
| #ifdef CONFIG_MTD_CFI |
| if (!mtd_cs) { |
| mtd_cs = do_map_probe("cfi_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 boundries. |
| * |
| * 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. |
| */ |
| static struct mtd_info *flash_probe(void) |
| { |
| struct mtd_info *mtd_cse0; |
| struct mtd_info *mtd_cse1; |
| struct mtd_info *mtd_cse; |
| |
| mtd_cse0 = probe_cs(&map_cse0); |
| mtd_cse1 = probe_cs(&map_cse1); |
| |
| if (!mtd_cse0 && !mtd_cse1) { |
| /* No chip found. */ |
| return NULL; |
| } |
| |
| if (mtd_cse0 && mtd_cse1) { |
| #ifdef CONFIG_MTD_CONCAT |
| struct mtd_info *mtds[] = { mtd_cse0, mtd_cse1 }; |
| |
| /* 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_cse = mtd_concat_create(mtds, |
| sizeof(mtds) / sizeof(mtds[0]), |
| "cse0+cse1"); |
| #else |
| printk(KERN_ERR "%s and %s: Cannot concatenate due to kernel " |
| "(mis)configuration!\n", map_cse0.name, map_cse1.name); |
| mtd_cse = NULL; |
| #endif |
| if (!mtd_cse) { |
| 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_cse = mtd_cse0; |
| map_destroy(mtd_cse1); |
| } |
| } else { |
| mtd_cse = mtd_cse0? mtd_cse0 : mtd_cse1; |
| } |
| |
| return mtd_cse; |
| } |
| |
| /* |
| * 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 *mymtd; |
| int err = 0; |
| int pidx = 0; |
| struct partitiontable_head *ptable_head = NULL; |
| struct partitiontable_entry *ptable; |
| int use_default_ptable = 1; /* Until proven otherwise. */ |
| const char *pmsg = KERN_INFO " /dev/flash%d at 0x%08x, size 0x%08x\n"; |
| |
| if (!(mymtd = flash_probe())) { |
| /* 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"); |
| } else { |
| printk(KERN_INFO "%s: 0x%08x bytes of flash memory.\n", |
| mymtd->name, mymtd->size); |
| axisflash_mtd = mymtd; |
| } |
| |
| if (mymtd) { |
| mymtd->module = THIS_MODULE; |
| ptable_head = (struct partitiontable_head *)(FLASH_CACHED_ADDR + |
| CONFIG_ETRAX_PTABLE_SECTOR + |
| PARTITION_TABLE_OFFSET); |
| } |
| pidx++; /* First partition is always set to the default. */ |
| |
| 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. |
| */ |
| int ptable_ok = 0; |
| 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 " 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 when |
| * there is 0xffffffff, that is, empty flash. |
| */ |
| while (ptable_ok |
| && ptable->offset != 0xffffffff |
| && ptable < max_addr |
| && pidx < MAX_PARTITIONS) { |
| |
| axis_partitions[pidx].offset = offset + ptable->offset; |
| axis_partitions[pidx].size = ptable->size; |
| |
| printk(pmsg, pidx, axis_partitions[pidx].offset, |
| axis_partitions[pidx].size); |
| pidx++; |
| ptable++; |
| } |
| use_default_ptable = !ptable_ok; |
| } |
| |
| if (romfs_in_flash) { |
| /* Add an overlapping device for the root partition (romfs). */ |
| |
| axis_partitions[pidx].name = "romfs"; |
| axis_partitions[pidx].size = romfs_length; |
| axis_partitions[pidx].offset = romfs_start - FLASH_CACHED_ADDR; |
| axis_partitions[pidx].mask_flags |= MTD_WRITEABLE; |
| |
| printk(KERN_INFO |
| " Adding readonly flash partition for romfs image:\n"); |
| printk(pmsg, pidx, axis_partitions[pidx].offset, |
| axis_partitions[pidx].size); |
| pidx++; |
| } |
| |
| if (mymtd) { |
| if (use_default_ptable) { |
| printk(KERN_INFO " Using default partition table.\n"); |
| err = add_mtd_partitions(mymtd, axis_default_partitions, |
| NUM_DEFAULT_PARTITIONS); |
| } else { |
| err = add_mtd_partitions(mymtd, axis_partitions, pidx); |
| } |
| |
| if (err) { |
| panic("axisflashmap could not add MTD partitions!\n"); |
| } |
| } |
| |
| if (!romfs_in_flash) { |
| /* Create an RAM device for the root partition (romfs). */ |
| |
| #if !defined(CONFIG_MTD_MTDRAM) || (CONFIG_MTDRAM_TOTAL_SIZE != 0) || (CONFIG_MTDRAM_ABS_POS != 0) |
| /* No use trying to boot this kernel from RAM. Panic! */ |
| printk(KERN_EMERG "axisflashmap: Cannot create an MTD RAM " |
| "device due to kernel (mis)configuration!\n"); |
| panic("This kernel cannot boot from RAM!\n"); |
| #else |
| struct mtd_info *mtd_ram; |
| |
| mtd_ram = (struct mtd_info *)kmalloc(sizeof(struct mtd_info), |
| GFP_KERNEL); |
| if (!mtd_ram) { |
| panic("axisflashmap couldn't allocate memory for " |
| "mtd_info!\n"); |
| } |
| |
| printk(KERN_INFO " Adding RAM partition for romfs image:\n"); |
| printk(pmsg, pidx, romfs_start, romfs_length); |
| |
| err = mtdram_init_device(mtd_ram, (void*)romfs_start, |
| romfs_length, "romfs"); |
| if (err) { |
| panic("axisflashmap could not initialize MTD RAM " |
| "device!\n"); |
| } |
| #endif |
| } |
| |
| return err; |
| } |
| |
| /* This adds the above to the kernels init-call chain. */ |
| module_init(init_axis_flash); |
| |
| EXPORT_SYMBOL(axisflash_mtd); |