1 files changed, 280 insertions, 0 deletions

diff --git a/drivers/mtd/maps/ixp2000.c b/drivers/mtd/maps/ixp2000.c
new file mode 100644
index 000000000000..c5b5f447e34b
--- /dev/null
+++ b/drivers/mtd/maps/ixp2000.c
@@ -0,0 +1,280 @@
+/*
+ * $Id: ixp2000.c,v 1.5 2004/11/16 17:15:48 dsaxena Exp $
+ *
+ * drivers/mtd/maps/ixp2000.c
+ *
+ * Mapping for the Intel XScale IXP2000 based systems
+ *
+ * Copyright (C) 2002 Intel Corp.
+ * Copyright (C) 2003-2004 MontaVista Software, Inc.
+ *
+ * Original Author: Naeem M Afzal <naeem.m.afzal@intel.com>
+ * Maintainer: Deepak Saxena <dsaxena@plexity.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ * 
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+#include <asm/mach/flash.h>
+
+#include <linux/reboot.h>
+
+struct ixp2000_flash_info {
+        struct          mtd_info *mtd;
+        struct          map_info map;
+        struct          mtd_partition *partitions;
+        struct          resource *res;
+        int             nr_banks;
+};
+
+static inline unsigned long flash_bank_setup(struct map_info *map, unsigned long ofs)
+{       
+        unsigned long (*set_bank)(unsigned long) = 
+                (unsigned long(*)(unsigned long))map->map_priv_2;
+
+        return (set_bank ? set_bank(ofs) : ofs);
+}
+
+#ifdef __ARMEB__
+/*
+ * Rev A0 and A1 of IXP2400 silicon have a broken addressing unit which 
+ * causes the lower address bits to be XORed with 0x11 on 8 bit accesses 
+ * and XORed with 0x10 on 16 bit accesses. See the spec update, erratum 44.
+ */
+static int erratum44_workaround = 0;
+
+static inline unsigned long address_fix8_write(unsigned long addr)
+{
+        if (erratum44_workaround) {
+                return (addr ^ 3);
+        }
+        return addr;
+}
+#else
+
+#define address_fix8_write(x)   (x)
+#endif
+
+static map_word ixp2000_flash_read8(struct map_info *map, unsigned long ofs)
+{
+        map_word val;
+
+        val.x[0] =  *((u8 *)(map->map_priv_1 + flash_bank_setup(map, ofs)));
+        return val;
+}
+
+/*
+ * We can't use the standard memcpy due to the broken SlowPort
+ * address translation on rev A0 and A1 silicon and the fact that
+ * we have banked flash.
+ */
+static void ixp2000_flash_copy_from(struct map_info *map, void *to,
+                              unsigned long from, ssize_t len)
+{
+        from = flash_bank_setup(map, from);
+        while(len--) 
+                *(__u8 *) to++ = *(__u8 *)(map->map_priv_1 + from++);
+}
+
+static void ixp2000_flash_write8(struct map_info *map, map_word d, unsigned long ofs)
+{
+        *(__u8 *) (address_fix8_write(map->map_priv_1 +
+                                      flash_bank_setup(map, ofs))) = d.x[0];
+}
+
+static void ixp2000_flash_copy_to(struct map_info *map, unsigned long to,
+                            const void *from, ssize_t len)
+{
+        to = flash_bank_setup(map, to);
+        while(len--) {
+                unsigned long tmp = address_fix8_write(map->map_priv_1 + to++);
+                *(__u8 *)(tmp) = *(__u8 *)(from++);
+        }
+}
+
+
+static int ixp2000_flash_remove(struct device *_dev)
+{
+        struct platform_device *dev = to_platform_device(_dev);
+        struct flash_platform_data *plat = dev->dev.platform_data;
+        struct ixp2000_flash_info *info = dev_get_drvdata(&dev->dev);
+
+        dev_set_drvdata(&dev->dev, NULL);
+
+        if(!info)
+                return 0;
+
+        if (info->mtd) {
+                del_mtd_partitions(info->mtd);
+                map_destroy(info->mtd);
+        }
+        if (info->map.map_priv_1)
+                iounmap((void *) info->map.map_priv_1);
+
+        if (info->partitions) {
+                kfree(info->partitions); }
+
+        if (info->res) {
+                release_resource(info->res);
+                kfree(info->res);
+        }
+
+        if (plat->exit)
+                plat->exit();
+
+        return 0;
+}
+
+
+static int ixp2000_flash_probe(struct device *_dev)
+{
+        static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
+        struct platform_device *dev = to_platform_device(_dev);
+        struct ixp2000_flash_data *ixp_data = dev->dev.platform_data;
+        struct flash_platform_data *plat; 
+        struct ixp2000_flash_info *info;
+        unsigned long window_size;
+        int err = -1;
+        
+        if (!ixp_data)
+                return -ENODEV;
+
+        plat = ixp_data->platform_data;
+        if (!plat)
+                return -ENODEV;
+
+        window_size = dev->resource->end - dev->resource->start + 1;
+        dev_info(_dev, "Probe of IXP2000 flash(%d banks x %dMiB)\n", 
+                        ixp_data->nr_banks, ((u32)window_size >> 20));
+
+        if (plat->width != 1) {
+                dev_err(_dev, "IXP2000 MTD map only supports 8-bit mode, asking for %d\n",
+                                plat->width * 8);
+                return -EIO;
+        }
+
+        info = kmalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL);
+        if(!info) {
+                err = -ENOMEM;
+                goto Error;
+        }       
+        memzero(info, sizeof(struct ixp2000_flash_info));
+
+        dev_set_drvdata(&dev->dev, info);
+
+        /*
+         * Tell the MTD layer we're not 1:1 mapped so that it does
+         * not attempt to do a direct access on us.
+         */
+        info->map.phys = NO_XIP;
+        
+        info->nr_banks = ixp_data->nr_banks;
+        info->map.size = ixp_data->nr_banks * window_size;
+        info->map.bankwidth = 1;
+
+        /*
+         * map_priv_2 is used to store a ptr to to the bank_setup routine
+         */
+        info->map.map_priv_2 = (void __iomem *) ixp_data->bank_setup;
+
+        info->map.name = dev->dev.bus_id;
+        info->map.read = ixp2000_flash_read8;
+        info->map.write = ixp2000_flash_write8;
+        info->map.copy_from = ixp2000_flash_copy_from;
+        info->map.copy_to = ixp2000_flash_copy_to;
+
+        info->res = request_mem_region(dev->resource->start, 
+                        dev->resource->end - dev->resource->start + 1, 
+                        dev->dev.bus_id);
+        if (!info->res) {
+                dev_err(_dev, "Could not reserve memory region\n");
+                err = -ENOMEM;
+                goto Error;
+        }
+
+        info->map.map_priv_1 = ioremap(dev->resource->start, 
+                                dev->resource->end - dev->resource->start + 1);
+        if (!info->map.map_priv_1) {
+                dev_err(_dev, "Failed to ioremap flash region\n");
+                err = -EIO;
+                goto Error;
+        }
+
+        /*
+         * Setup read mode for FLASH
+         */
+        *IXP2000_SLOWPORT_FRM = 1;
+
+#if defined(__ARMEB__)
+        /*
+         * Enable erratum 44 workaround for NPUs with broken slowport
+         */
+
+        erratum44_workaround = ixp2000_has_broken_slowport();
+        dev_info(_dev, "Erratum 44 workaround %s\n",
+               erratum44_workaround ? "enabled" : "disabled");
+#endif
+
+        info->mtd = do_map_probe(plat->map_name, &info->map);
+        if (!info->mtd) {
+                dev_err(_dev, "map_probe failed\n");
+                err = -ENXIO;
+                goto Error;
+        }
+        info->mtd->owner = THIS_MODULE;
+
+        err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
+        if (err > 0) {
+                err = add_mtd_partitions(info->mtd, info->partitions, err);
+                if(err)
+                        dev_err(_dev, "Could not parse partitions\n");
+        }
+
+        if (err)
+                goto Error;
+
+        return 0;
+
+Error:
+        ixp2000_flash_remove(_dev);
+        return err;
+}
+
+static struct device_driver ixp2000_flash_driver = {
+        .name           = "IXP2000-Flash",
+        .bus            = &platform_bus_type,
+        .probe          = &ixp2000_flash_probe,
+        .remove         = &ixp2000_flash_remove
+};
+
+static int __init ixp2000_flash_init(void)
+{
+        return driver_register(&ixp2000_flash_driver);
+}
+
+static void __exit ixp2000_flash_exit(void)
+{
+        driver_unregister(&ixp2000_flash_driver);
+}
+
+module_init(ixp2000_flash_init);
+module_exit(ixp2000_flash_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
+