/* * Physical mapping layer for MTD using the Axis partitiontable format * * Copyright (c) 2001 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 1.15 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 #include #include #include #include #include #include #include #include #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 /* * WINDOW_SIZE is the total size where the flash chips may be mapped. * 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. */ #define WINDOW_SIZE (128 * 1024 * 1024) extern unsigned long romfs_start, romfs_length, romfs_in_flash; /* From head.S */ /* * Map driver * * Ok this is the scoop - we need to access the flash both with and without * the cache - without when doing all the fancy flash interfacing, and with * when we do actual copying because otherwise it will be slow like molasses. */ static __u8 flash_read8(struct map_info *map, unsigned long ofs) { return *(__u8 *)(FLASH_UNCACHED_ADDR + ofs); } static __u16 flash_read16(struct map_info *map, unsigned long ofs) { return *(__u16 *)(FLASH_UNCACHED_ADDR + ofs); } static __u32 flash_read32(struct map_info *map, unsigned long ofs) { return *(volatile unsigned int *)(FLASH_UNCACHED_ADDR + ofs); } static void flash_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) { memcpy(to, (void *)(FLASH_CACHED_ADDR + from), len); } static void flash_write8(struct map_info *map, __u8 d, unsigned long adr) { *(__u8 *)(FLASH_UNCACHED_ADDR + adr) = d; } static void flash_write16(struct map_info *map, __u16 d, unsigned long adr) { *(__u16 *)(FLASH_UNCACHED_ADDR + adr) = d; } static void flash_write32(struct map_info *map, __u32 d, unsigned long adr) { *(__u32 *)(FLASH_UNCACHED_ADDR + adr) = d; } static struct map_info axis_map = { name: "Axis flash", size: WINDOW_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, }; /* 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) } }; static struct mtd_partition axis_partitions[MAX_PARTITIONS] = { { name: "part0", size: 0, 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 }, }; /* * This is the master MTD device for which all the others are just * auto-relocating aliases. */ static struct mtd_info *mymtd; /* CFI-scan the flash, and if there was a chip, read the partition-table * and register the partitions with MTD. */ static int __init init_axis_flash(void) { int pidx = 0; struct partitiontable_head *ptable_head; struct partitiontable_entry *ptable; int use_default_ptable = 1; /* Until proven otherwise */ const char *pmsg = " /dev/flash%d at 0x%x, size 0x%x\n"; printk(KERN_NOTICE "Axis flash mapping: %x at %x\n", WINDOW_SIZE, FLASH_CACHED_ADDR); #ifdef CONFIG_MTD_CFI mymtd = (struct mtd_info *)do_map_probe("cfi_probe", &axis_map); #endif #ifdef CONFIG_MTD_AMDSTD if (!mymtd) { mymtd = (struct mtd_info *)do_map_probe("amd_flash", &axis_map); } #endif if(!mymtd) { printk("%s: No flash chip found!\n", axis_map.name); return -ENXIO; } 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->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++; } /* printk(" total csum: 0x%08X 0x%08X\n", csum, ptable_head->checksum); */ ptable_ok = (csum == ptable_head->checksum); /* Read the entries and use/show the info. */ printk(" Found %s partition table at 0x%08lX-0x%08lX.\n", (ptable_ok ? "valid" : "invalid"), (unsigned long)ptable_head, (unsigned long)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 (use_default_ptable) { printk(" Using default partition table\n"); return add_mtd_partitions(mymtd, axis_default_partitions, NUM_DEFAULT_PARTITIONS); } else { if (romfs_in_flash) { 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(" Adding readonly partition for romfs image:\n"); printk(pmsg, pidx, axis_partitions[pidx].offset, axis_partitions[pidx].size); pidx++; } return add_mtd_partitions(mymtd, axis_partitions, pidx); } } /* This adds the above to the kernels init-call chain */ module_init(init_axis_flash);