--- /dev/null
+/*
+ * $Id: ixp4xx.c,v 1.1 2004/05/13 22:21:26 dsaxena Exp $
+ *
+ * drivers/mtd/maps/ixp4xx.c
+ *
+ * MTD Map file for IXP4XX based systems. Please do not make per-board
+ * changes in here. If your board needs special setup, do it in your
+ * platform level code in arch/arm/mach-ixp4xx/board-setup.c
+ *
+ * Original Author: Intel Corporation
+ * Maintainer: Deepak Saxena <dsaxena@mvista.com>
+ *
+ * Copyright (C) 2002 Intel Corporation
+ * Copyright (C) 2003-2004 MontaVista Software, Inc.
+ *
+ */
+
+#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/mach-types.h>
+#include <asm/mach/flash.h>
+
+#include <linux/reboot.h>
+
+#ifndef __ARMEB__
+#define BYTE0(h) ((h) & 0xFF)
+#define BYTE1(h) (((h) >> 8) & 0xFF)
+#else
+#define BYTE0(h) (((h) >> 8) & 0xFF)
+#define BYTE1(h) ((h) & 0xFF)
+#endif
+
+static __u16
+ixp4xx_read16(struct map_info *map, unsigned long ofs)
+{
+ return *(__u16 *) (map->map_priv_1 + ofs);
+}
+
+/*
+ * The IXP4xx expansion bus only allows 16-bit wide acceses
+ * when attached to a 16-bit wide device (such as the 28F128J3A),
+ * so we can't just memcpy_fromio().
+ */
+static void
+ixp4xx_copy_from(struct map_info *map, void *to,
+ unsigned long from, ssize_t len)
+{
+ int i;
+ u8 *dest = (u8 *) to;
+ u16 *src = (u16 *) (map->map_priv_1 + from);
+ u16 data;
+
+ for (i = 0; i < (len / 2); i++) {
+ data = src[i];
+ dest[i * 2] = BYTE0(data);
+ dest[i * 2 + 1] = BYTE1(data);
+ }
+
+ if (len & 1)
+ dest[len - 1] = BYTE0(src[i]);
+}
+
+static void
+ixp4xx_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+ *(__u16 *) (map->map_priv_1 + adr) = d;
+}
+
+struct ixp4xx_flash_info {
+ struct mtd_info *mtd;
+ struct map_info map;
+ struct mtd_partition *partitions;
+ struct resource *res;
+};
+
+static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
+
+static int
+ixp4xx_flash_remove(struct device *_dev)
+{
+ struct platform_device *dev = to_platform_device(_dev);
+ struct flash_platform_data *plat = dev->dev.platform_data;
+ struct ixp4xx_flash_info *info = dev_get_drvdata(&dev->dev);
+
+ dev_set_drvdata(&dev->dev, NULL);
+
+ if(!info)
+ return 0;
+
+ /*
+ * This is required for a soft reboot to work.
+ */
+ ixp4xx_write16(&info->map, 0xff, 0x55 * 0x2);
+
+ 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();
+
+ /* Disable flash write */
+ *IXP4XX_EXP_CS0 &= ~IXP4XX_FLASH_WRITABLE;
+
+ return 0;
+}
+
+static int ixp4xx_flash_probe(struct device *_dev)
+{
+ struct platform_device *dev = to_platform_device(_dev);
+ struct flash_platform_data *plat = dev->dev.platform_data;
+ struct ixp4xx_flash_info *info;
+ int err = -1;
+
+ if (!plat)
+ return -ENODEV;
+
+ if (plat->init) {
+ err = plat->init();
+ if (err)
+ return err;
+ }
+
+ info = kmalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
+ if(!info) {
+ err = -ENOMEM;
+ goto Error;
+ }
+ memzero(info, sizeof(struct ixp4xx_flash_info));
+
+ dev_set_drvdata(&dev->dev, info);
+
+ /*
+ * Enable flash write
+ * TODO: Move this out to board specific code
+ */
+ *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
+
+ /*
+ * 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->map.size = dev->resource->end - dev->resource->start + 1;
+
+ /*
+ * We only support 16-bit accesses for now. If and when
+ * any board use 8-bit access, we'll fixup the driver to
+ * handle that.
+ */
+ info->map.buswidth = 2;
+ info->map.name = dev->dev.bus_id;
+ info->map.read16 = ixp4xx_read16,
+ info->map.write16 = ixp4xx_write16,
+ info->map.copy_from = ixp4xx_copy_from,
+
+ info->res = request_mem_region(dev->resource->start,
+ dev->resource->end - dev->resource->start + 1,
+ "IXP4XXFlash");
+ if (!info->res) {
+ printk(KERN_ERR "IXP4XXFlash: 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) {
+ printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
+ err = -EIO;
+ goto Error;
+ }
+
+ info->mtd = do_map_probe(plat->map_name, &info->map);
+ if (!info->mtd) {
+ printk(KERN_ERR "IXP4XXFlash: 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)
+ printk(KERN_ERR "Could not parse partitions\n");
+ }
+
+ if (err)
+ goto Error;
+
+ return 0;
+
+Error:
+ ixp4xx_flash_remove(_dev);
+ return err;
+}
+
+static struct device_driver ixp4xx_flash_driver = {
+ .name = "IXP4XX-Flash",
+ .bus = &platform_bus_type,
+ .probe = ixp4xx_flash_probe,
+ .remove = ixp4xx_flash_remove,
+};
+
+static int __init ixp4xx_flash_init(void)
+{
+ return driver_register(&ixp4xx_flash_driver);
+}
+
+static void __exit ixp4xx_flash_exit(void)
+{
+ driver_unregister(&ixp4xx_flash_driver);
+}
+
+
+module_init(ixp4xx_flash_init);
+module_exit(ixp4xx_flash_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems")
+MODULE_AUTHOR("Deepak Saxena");
+
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