1 files changed, 541 insertions, 0 deletions

diff --git a/arch/cris/arch-v10/drivers/axisflashmap.c b/arch/cris/arch-v10/drivers/axisflashmap.c
new file mode 100644
index 000000000000..fb7d4855ea62
--- /dev/null
+++ b/arch/cris/arch-v10/drivers/axisflashmap.c
@@ -0,0 +1,541 @@
+/*
+ * 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 1.10  2004/08/16 12:37:22  starvik
+ * Merge of Linux 2.6.8
+ *
+ * Revision 1.8  2004/05/14 07:58:03  starvik
+ * Merge of changes from 2.4
+ *
+ * Revision 1.6  2003/07/04 08:27:37  starvik
+ * Merge of Linux 2.5.74
+ *
+ * Revision 1.5  2002/12/11 13:13:57  starvik
+ * Added arch/ to v10 specific includes
+ * Added fix from Linux 2.4 in serial.c (flush_to_flip_buffer)
+ *
+ * Revision 1.4  2002/11/20 11:56:10  starvik
+ * Merge of Linux 2.5.48
+ *
+ * Revision 1.3  2002/11/13 14:54:13  starvik
+ * Copied from linux 2.4
+ *
+ * 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/init.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/arch/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
+
+#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 __u16
+#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 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
+};
+
+/* 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 = "  /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->owner = 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);