1 files changed, 203 insertions, 0 deletions

diff --git a/drivers/mtd/maps/pb1550-flash.c b/drivers/mtd/maps/pb1550-flash.c
new file mode 100644
index 000000000000..1424726a219e
--- /dev/null
+++ b/drivers/mtd/maps/pb1550-flash.c
@@ -0,0 +1,203 @@
+/*
+ * Flash memory access on Alchemy Pb1550 board
+ * 
+ * $Id: pb1550-flash.c,v 1.6 2004/11/04 13:24:15 gleixner Exp $
+ *
+ * (C) 2004 Embedded Edge, LLC, based on pb1550-flash.c:
+ * (C) 2003 Pete Popov <ppopov@pacbell.net>
+ * 
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+#include <asm/au1000.h>
+#include <asm/pb1550.h>
+
+#ifdef  DEBUG_RW
+#define DBG(x...)       printk(x)
+#else
+#define DBG(x...)       
+#endif
+
+static unsigned long window_addr;
+static unsigned long window_size;
+
+
+static struct map_info pb1550_map = {
+        .name = "Pb1550 flash",
+};
+
+static unsigned char flash_bankwidth = 4;
+
+/* 
+ * Support only 64MB NOR Flash parts
+ */
+
+#ifdef PB1550_BOTH_BANKS
+/* both banks will be used. Combine the first bank and the first 
+ * part of the second bank together into a single jffs/jffs2
+ * partition.
+ */
+static struct mtd_partition pb1550_partitions[] = {
+        /* assume boot[2:0]:swap is '0000' or '1000', which translates to:
+         * 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash
+         * 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash
+         */
+        {
+                .name = "User FS",
+                .size =   (0x1FC00000 - 0x18000000),
+                .offset = 0x0000000
+        },{
+                .name = "yamon",
+                .size = 0x0100000,
+                .offset = MTDPART_OFS_APPEND,
+                .mask_flags = MTD_WRITEABLE
+        },{
+                .name = "raw kernel",
+                .size = (0x300000 - 0x40000), /* last 256KB is yamon env */
+                .offset = MTDPART_OFS_APPEND,
+        }
+};
+#elif defined(PB1550_BOOT_ONLY)
+static struct mtd_partition pb1550_partitions[] = {
+        /* assume boot[2:0]:swap is '0000' or '1000', which translates to:
+         * 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash
+         */
+        {
+                .name = "User FS",
+                .size =   0x03c00000,
+                .offset = 0x0000000
+        },{
+                .name = "yamon",
+                .size = 0x0100000,
+                .offset = MTDPART_OFS_APPEND,
+                .mask_flags = MTD_WRITEABLE
+        },{
+                .name = "raw kernel",
+                .size = (0x300000-0x40000), /* last 256KB is yamon env */
+                .offset = MTDPART_OFS_APPEND,
+        }
+};
+#elif defined(PB1550_USER_ONLY)
+static struct mtd_partition pb1550_partitions[] = {
+        /* assume boot[2:0]:swap is '0000' or '1000', which translates to:
+         * 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash
+         */
+        {
+                .name = "User FS",
+                .size = (0x4000000 - 0x200000), /* reserve 2MB for raw kernel */
+                .offset = 0x0000000
+        },{
+                .name = "raw kernel",
+                .size = MTDPART_SIZ_FULL,
+                .offset = MTDPART_OFS_APPEND,
+        }
+};
+#else
+#error MTD_PB1550 define combo error /* should never happen */
+#endif
+
+#define NB_OF(x)  (sizeof(x)/sizeof(x[0]))
+
+static struct mtd_info *mymtd;
+
+/*
+ * Probe the flash density and setup window address and size
+ * based on user CONFIG options. There are times when we don't
+ * want the MTD driver to be probing the boot or user flash,
+ * so having the option to enable only one bank is important.
+ */
+int setup_flash_params(void)
+{
+        u16 boot_swapboot;
+        boot_swapboot = (au_readl(MEM_STSTAT) & (0x7<<1)) | 
+                ((bcsr->status >> 6)  & 0x1);
+        printk("Pb1550 MTD: boot:swap %d\n", boot_swapboot);
+
+        switch (boot_swapboot) {
+                case 0: /* 512Mbit devices, both enabled */
+                case 1: 
+                case 8:
+                case 9: 
+#if defined(PB1550_BOTH_BANKS)
+                        window_addr = 0x18000000;
+                        window_size = 0x8000000; 
+#elif defined(PB1550_BOOT_ONLY)
+                        window_addr = 0x1C000000;
+                        window_size = 0x4000000; 
+#else /* USER ONLY */
+                        window_addr = 0x1E000000;
+                        window_size = 0x4000000; 
+#endif
+                        break;
+                case 0xC:
+                case 0xD:
+                case 0xE:
+                case 0xF: 
+                        /* 64 MB Boot NOR Flash is disabled */
+                        /* and the start address is moved to 0x0C00000 */
+                        window_addr = 0x0C000000;
+                        window_size = 0x4000000; 
+                default:
+                        printk("Pb1550 MTD: unsupported boot:swap setting\n");
+                        return 1;
+        }
+        return 0;
+}
+
+int __init pb1550_mtd_init(void)
+{
+        struct mtd_partition *parts;
+        int nb_parts = 0;
+        
+        /* Default flash bankwidth */
+        pb1550_map.bankwidth = flash_bankwidth;
+
+        if (setup_flash_params()) 
+                return -ENXIO;
+
+        /*
+         * Static partition definition selection
+         */
+        parts = pb1550_partitions;
+        nb_parts = NB_OF(pb1550_partitions);
+        pb1550_map.size = window_size;
+
+        /*
+         * Now let's probe for the actual flash.  Do it here since
+         * specific machine settings might have been set above.
+         */
+        printk(KERN_NOTICE "Pb1550 flash: probing %d-bit flash bus\n", 
+                        pb1550_map.bankwidth*8);
+        pb1550_map.virt = ioremap(window_addr, window_size);
+        mymtd = do_map_probe("cfi_probe", &pb1550_map);
+        if (!mymtd) return -ENXIO;
+        mymtd->owner = THIS_MODULE;
+
+        add_mtd_partitions(mymtd, parts, nb_parts);
+        return 0;
+}
+
+static void __exit pb1550_mtd_cleanup(void)
+{
+        if (mymtd) {
+                del_mtd_partitions(mymtd);
+                map_destroy(mymtd);
+        }
+}
+
+module_init(pb1550_mtd_init);
+module_exit(pb1550_mtd_cleanup);
+
+MODULE_AUTHOR("Embedded Edge, LLC");
+MODULE_DESCRIPTION("Pb1550 mtd map driver");
+MODULE_LICENSE("GPL");