--- /dev/null
+/*
+ * $Id: ixp2000.c,v 1.1 2004/09/02 00:13:41 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, erratta 44.
+ */
+static int errata44_workaround = 0;
+
+static inline unsigned long address_fix8_write(unsigned long addr)
+{
+ if (errata44_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 %dM)\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 = (u32) 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 =
+ (unsigned long) 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 errata 44 workaround for NPUs with broken slowport
+ */
+
+ errata44_workaround = ixp2000_has_broken_slowport();
+ dev_info(_dev, "Errata 44 workaround %s\n",
+ errata44_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>");
+
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