7e9204265b
Updates to device drivers. * Use I/O and DMA allocators. * Use wait_event_interruptible instead of interrutiple_sleep_on. * Added spinlocks SMP. * Changed restore_flags to local_irq_restore etc. * Updated IDE driver include to fit 2.6.12. Signed-off-by: Mikael Starvik <starvik@axis.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
545 lines
15 KiB
C
545 lines
15 KiB
C
/*
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* Physical mapping layer for MTD using the Axis partitiontable format
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*
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* Copyright (c) 2001, 2002 Axis Communications AB
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*
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* This file is under the GPL.
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*
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* First partition is always sector 0 regardless of if we find a partitiontable
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* or not. In the start of the next sector, there can be a partitiontable that
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* tells us what other partitions to define. If there isn't, we use a default
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* partition split defined below.
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*
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* $Log: axisflashmap.c,v $
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* Revision 1.11 2004/11/15 10:27:14 starvik
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* Corrected typo (Thanks to Milton Miller <miltonm@bga.com>).
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*
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* Revision 1.10 2004/08/16 12:37:22 starvik
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* Merge of Linux 2.6.8
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*
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* Revision 1.8 2004/05/14 07:58:03 starvik
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* Merge of changes from 2.4
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*
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* Revision 1.6 2003/07/04 08:27:37 starvik
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* Merge of Linux 2.5.74
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*
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* Revision 1.5 2002/12/11 13:13:57 starvik
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* Added arch/ to v10 specific includes
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* Added fix from Linux 2.4 in serial.c (flush_to_flip_buffer)
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*
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* Revision 1.4 2002/11/20 11:56:10 starvik
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* Merge of Linux 2.5.48
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*
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* Revision 1.3 2002/11/13 14:54:13 starvik
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* Copied from linux 2.4
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*
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* Revision 1.28 2002/10/01 08:08:43 jonashg
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* The first partition ends at the start of the partition table.
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*
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* Revision 1.27 2002/08/21 09:23:13 jonashg
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* Speling.
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*
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* Revision 1.26 2002/08/21 08:35:20 jonashg
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* Cosmetic change to printouts.
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*
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* Revision 1.25 2002/08/21 08:15:42 jonashg
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* Made it compile even without CONFIG_MTD_CONCAT defined.
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*
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* Revision 1.24 2002/08/20 13:12:35 jonashg
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* * New approach to probing. Probe cse0 and cse1 separately and (mtd)concat
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* the results.
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* * Removed compile time tests concerning how the mtdram driver has been
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* configured. The user will know about the misconfiguration at runtime
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* instead. (The old approach made it impossible to use mtdram for anything
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* else than RAM boot).
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*
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* Revision 1.23 2002/05/13 12:12:28 johana
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* Allow compile without CONFIG_MTD_MTDRAM but warn at compiletime and
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* be informative at runtime.
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*
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* Revision 1.22 2002/05/13 10:24:44 johana
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* Added #if checks on MTDRAM CONFIG
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*
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* Revision 1.21 2002/05/06 16:05:20 johana
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* Removed debug printout.
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*
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* Revision 1.20 2002/05/06 16:03:00 johana
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* No more cramfs as root hack in generic code.
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* It's handled by axisflashmap using mtdram.
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*
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* Revision 1.19 2002/03/15 17:10:28 bjornw
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* Changed comment about cached access since we changed this before
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*
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* Revision 1.18 2002/03/05 17:06:15 jonashg
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* Try amd_flash probe before cfi_probe since amd_flash driver can handle two
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* (or more) flash chips of different model and the cfi driver cannot.
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*
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* Revision 1.17 2001/11/12 19:42:38 pkj
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* Fixed compiler warnings.
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*
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* Revision 1.16 2001/11/08 11:18:58 jonashg
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* Always read from uncached address to avoid problems with flushing
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* cachelines after write and MTD-erase. No performance loss have been
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* seen yet.
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*
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* Revision 1.15 2001/10/19 12:41:04 jonashg
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* Name of probe has changed in MTD.
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*
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* Revision 1.14 2001/09/21 07:14:10 jonashg
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* Made root filesystem (cramfs) use mtdblock driver when booting from flash.
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*
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* Revision 1.13 2001/08/15 13:57:35 jonashg
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* Entire MTD updated to the linux 2.4.7 version.
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*
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* Revision 1.12 2001/06/11 09:50:30 jonashg
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* Oops, 2MB is 0x200000 bytes.
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*
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* Revision 1.11 2001/06/08 11:39:44 jonashg
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* Changed sizes and offsets in axis_default_partitions to use
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* CONFIG_ETRAX_PTABLE_SECTOR.
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*
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* Revision 1.10 2001/05/29 09:42:03 jonashg
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* Use macro for end marker length instead of sizeof.
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*
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* Revision 1.9 2001/05/29 08:52:52 jonashg
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* Gave names to the magic fours (size of the ptable end marker).
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*
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* Revision 1.8 2001/05/28 15:36:20 jonashg
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* * Removed old comment about ptable location in flash (it's a CONFIG_ option).
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* * Variable ptable was initialized twice to the same value.
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*
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* Revision 1.7 2001/04/05 13:41:46 markusl
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* Updated according to review remarks
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*
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* Revision 1.6 2001/03/07 09:21:21 bjornw
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* No need to waste .data
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*
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* Revision 1.5 2001/03/06 16:27:01 jonashg
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* Probe the entire flash area for flash devices.
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*
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* Revision 1.4 2001/02/23 12:47:15 bjornw
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* Uncached flash in LOW_MAP moved from 0xe to 0x8
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*
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* Revision 1.3 2001/02/16 12:11:45 jonashg
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* MTD driver amd_flash is now included in MTD CVS repository.
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* (It's now in drivers/mtd).
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*
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* Revision 1.2 2001/02/09 11:12:22 jonashg
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* Support for AMD compatible non-CFI flash chips.
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* Only tested with Toshiba TC58FVT160 so far.
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*
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* Revision 1.1 2001/01/12 17:01:18 bjornw
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* * Added axisflashmap.c, a physical mapping for MTD that reads and understands
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* Axis partition-table format.
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*
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/mtd/concat.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/mtdram.h>
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#include <linux/mtd/partitions.h>
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#include <asm/axisflashmap.h>
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#include <asm/mmu.h>
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#include <asm/arch/sv_addr_ag.h>
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#ifdef CONFIG_CRIS_LOW_MAP
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#define FLASH_UNCACHED_ADDR KSEG_8
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#define FLASH_CACHED_ADDR KSEG_5
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#else
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#define FLASH_UNCACHED_ADDR KSEG_E
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#define FLASH_CACHED_ADDR KSEG_F
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#endif
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#if CONFIG_ETRAX_FLASH_BUSWIDTH==1
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#define flash_data __u8
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#elif CONFIG_ETRAX_FLASH_BUSWIDTH==2
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#define flash_data __u16
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#elif CONFIG_ETRAX_FLASH_BUSWIDTH==4
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#define flash_data __u32
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#endif
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/* From head.S */
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extern unsigned long romfs_start, romfs_length, romfs_in_flash;
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/* The master mtd for the entire flash. */
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struct mtd_info* axisflash_mtd = NULL;
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/* Map driver functions. */
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static map_word flash_read(struct map_info *map, unsigned long ofs)
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{
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map_word tmp;
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tmp.x[0] = *(flash_data *)(map->map_priv_1 + ofs);
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return tmp;
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}
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static void flash_copy_from(struct map_info *map, void *to,
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unsigned long from, ssize_t len)
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{
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memcpy(to, (void *)(map->map_priv_1 + from), len);
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}
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static void flash_write(struct map_info *map, map_word d, unsigned long adr)
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{
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*(flash_data *)(map->map_priv_1 + adr) = (flash_data)d.x[0];
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}
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/*
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* The map for chip select e0.
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*
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* We run into tricky coherence situations if we mix cached with uncached
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* accesses to we only use the uncached version here.
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*
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* The size field is the total size where the flash chips may be mapped on the
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* chip select. MTD probes should find all devices there and it does not matter
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* if there are unmapped gaps or aliases (mirrors of flash devices). The MTD
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* probes will ignore them.
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*
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* The start address in map_priv_1 is in virtual memory so we cannot use
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* MEM_CSE0_START but must rely on that FLASH_UNCACHED_ADDR is the start
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* address of cse0.
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*/
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static struct map_info map_cse0 = {
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.name = "cse0",
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.size = MEM_CSE0_SIZE,
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.bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH,
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.read = flash_read,
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.copy_from = flash_copy_from,
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.write = flash_write,
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.map_priv_1 = FLASH_UNCACHED_ADDR
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};
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/*
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* The map for chip select e1.
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*
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* If there was a gap between cse0 and cse1, map_priv_1 would get the wrong
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* address, but there isn't.
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*/
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static struct map_info map_cse1 = {
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.name = "cse1",
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.size = MEM_CSE1_SIZE,
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.bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH,
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.read = flash_read,
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.copy_from = flash_copy_from,
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.write = flash_write,
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.map_priv_1 = FLASH_UNCACHED_ADDR + MEM_CSE0_SIZE
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};
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/* If no partition-table was found, we use this default-set. */
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#define MAX_PARTITIONS 7
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#define NUM_DEFAULT_PARTITIONS 3
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/*
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* Default flash size is 2MB. CONFIG_ETRAX_PTABLE_SECTOR is most likely the
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* size of one flash block and "filesystem"-partition needs 5 blocks to be able
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* to use JFFS.
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*/
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static struct mtd_partition axis_default_partitions[NUM_DEFAULT_PARTITIONS] = {
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{
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.name = "boot firmware",
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.size = CONFIG_ETRAX_PTABLE_SECTOR,
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.offset = 0
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},
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{
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.name = "kernel",
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.size = 0x200000 - (6 * CONFIG_ETRAX_PTABLE_SECTOR),
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.offset = CONFIG_ETRAX_PTABLE_SECTOR
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},
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{
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.name = "filesystem",
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.size = 5 * CONFIG_ETRAX_PTABLE_SECTOR,
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.offset = 0x200000 - (5 * CONFIG_ETRAX_PTABLE_SECTOR)
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}
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};
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/* Initialize the ones normally used. */
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static struct mtd_partition axis_partitions[MAX_PARTITIONS] = {
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{
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.name = "part0",
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.size = CONFIG_ETRAX_PTABLE_SECTOR,
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.offset = 0
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},
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{
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.name = "part1",
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.size = 0,
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.offset = 0
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},
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{
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.name = "part2",
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.size = 0,
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.offset = 0
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},
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{
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.name = "part3",
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.size = 0,
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.offset = 0
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},
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{
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.name = "part4",
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.size = 0,
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.offset = 0
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},
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{
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.name = "part5",
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.size = 0,
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.offset = 0
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},
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{
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.name = "part6",
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.size = 0,
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.offset = 0
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},
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};
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/*
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* Probe a chip select for AMD-compatible (JEDEC) or CFI-compatible flash
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* chips in that order (because the amd_flash-driver is faster).
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*/
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static struct mtd_info *probe_cs(struct map_info *map_cs)
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{
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struct mtd_info *mtd_cs = NULL;
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printk(KERN_INFO
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"%s: Probing a 0x%08lx bytes large window at 0x%08lx.\n",
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map_cs->name, map_cs->size, map_cs->map_priv_1);
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#ifdef CONFIG_MTD_AMDSTD
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mtd_cs = do_map_probe("amd_flash", map_cs);
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#endif
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#ifdef CONFIG_MTD_CFI
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if (!mtd_cs) {
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mtd_cs = do_map_probe("cfi_probe", map_cs);
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}
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#endif
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return mtd_cs;
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}
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/*
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* Probe each chip select individually for flash chips. If there are chips on
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* both cse0 and cse1, the mtd_info structs will be concatenated to one struct
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* so that MTD partitions can cross chip boundries.
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*
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* The only known restriction to how you can mount your chips is that each
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* chip select must hold similar flash chips. But you need external hardware
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* to do that anyway and you can put totally different chips on cse0 and cse1
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* so it isn't really much of a restriction.
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*/
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static struct mtd_info *flash_probe(void)
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{
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struct mtd_info *mtd_cse0;
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struct mtd_info *mtd_cse1;
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struct mtd_info *mtd_cse;
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mtd_cse0 = probe_cs(&map_cse0);
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mtd_cse1 = probe_cs(&map_cse1);
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if (!mtd_cse0 && !mtd_cse1) {
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/* No chip found. */
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return NULL;
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}
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if (mtd_cse0 && mtd_cse1) {
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#ifdef CONFIG_MTD_CONCAT
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struct mtd_info *mtds[] = { mtd_cse0, mtd_cse1 };
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/* Since the concatenation layer adds a small overhead we
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* could try to figure out if the chips in cse0 and cse1 are
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* identical and reprobe the whole cse0+cse1 window. But since
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* flash chips are slow, the overhead is relatively small.
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* So we use the MTD concatenation layer instead of further
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* complicating the probing procedure.
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*/
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mtd_cse = mtd_concat_create(mtds,
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sizeof(mtds) / sizeof(mtds[0]),
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"cse0+cse1");
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#else
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printk(KERN_ERR "%s and %s: Cannot concatenate due to kernel "
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"(mis)configuration!\n", map_cse0.name, map_cse1.name);
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mtd_cse = NULL;
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#endif
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if (!mtd_cse) {
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printk(KERN_ERR "%s and %s: Concatenation failed!\n",
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map_cse0.name, map_cse1.name);
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/* The best we can do now is to only use what we found
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* at cse0.
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*/
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mtd_cse = mtd_cse0;
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map_destroy(mtd_cse1);
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}
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} else {
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mtd_cse = mtd_cse0? mtd_cse0 : mtd_cse1;
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}
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return mtd_cse;
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}
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/*
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* Probe the flash chip(s) and, if it succeeds, read the partition-table
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* and register the partitions with MTD.
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*/
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static int __init init_axis_flash(void)
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{
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struct mtd_info *mymtd;
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int err = 0;
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int pidx = 0;
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struct partitiontable_head *ptable_head = NULL;
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struct partitiontable_entry *ptable;
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int use_default_ptable = 1; /* Until proven otherwise. */
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const char *pmsg = " /dev/flash%d at 0x%08x, size 0x%08x\n";
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if (!(mymtd = flash_probe())) {
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/* There's no reason to use this module if no flash chip can
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* be identified. Make sure that's understood.
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*/
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printk(KERN_INFO "axisflashmap: Found no flash chip.\n");
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} else {
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printk(KERN_INFO "%s: 0x%08x bytes of flash memory.\n",
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mymtd->name, mymtd->size);
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axisflash_mtd = mymtd;
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}
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if (mymtd) {
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mymtd->owner = THIS_MODULE;
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ptable_head = (struct partitiontable_head *)(FLASH_CACHED_ADDR +
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CONFIG_ETRAX_PTABLE_SECTOR +
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PARTITION_TABLE_OFFSET);
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}
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pidx++; /* First partition is always set to the default. */
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if (ptable_head && (ptable_head->magic == PARTITION_TABLE_MAGIC)
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&& (ptable_head->size <
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(MAX_PARTITIONS * sizeof(struct partitiontable_entry) +
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PARTITIONTABLE_END_MARKER_SIZE))
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&& (*(unsigned long*)((void*)ptable_head + sizeof(*ptable_head) +
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ptable_head->size -
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PARTITIONTABLE_END_MARKER_SIZE)
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== PARTITIONTABLE_END_MARKER)) {
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/* Looks like a start, sane length and end of a
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* partition table, lets check csum etc.
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*/
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int ptable_ok = 0;
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struct partitiontable_entry *max_addr =
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(struct partitiontable_entry *)
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((unsigned long)ptable_head + sizeof(*ptable_head) +
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ptable_head->size);
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unsigned long offset = CONFIG_ETRAX_PTABLE_SECTOR;
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unsigned char *p;
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unsigned long csum = 0;
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ptable = (struct partitiontable_entry *)
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((unsigned long)ptable_head + sizeof(*ptable_head));
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/* Lets be PARANOID, and check the checksum. */
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p = (unsigned char*) ptable;
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while (p <= (unsigned char*)max_addr) {
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csum += *p++;
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csum += *p++;
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csum += *p++;
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csum += *p++;
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}
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ptable_ok = (csum == ptable_head->checksum);
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/* Read the entries and use/show the info. */
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printk(KERN_INFO " Found a%s partition table at 0x%p-0x%p.\n",
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(ptable_ok ? " valid" : "n invalid"), ptable_head,
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max_addr);
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/* We have found a working bootblock. Now read the
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* partition table. Scan the table. It ends when
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* there is 0xffffffff, that is, empty flash.
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*/
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while (ptable_ok
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&& ptable->offset != 0xffffffff
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&& ptable < max_addr
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&& pidx < MAX_PARTITIONS) {
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axis_partitions[pidx].offset = offset + ptable->offset;
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axis_partitions[pidx].size = ptable->size;
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printk(pmsg, pidx, axis_partitions[pidx].offset,
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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);
|