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 0000000..c5b5f44
--- /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>");
+