/* * $Id: ixp4xx.c,v 1.7 2004/11/04 13:24:15 gleixner 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 map_word ixp4xx_read16(struct map_info *map, unsigned long ofs) { map_word val; val.x[0] = *(__u16 *) (map->map_priv_1 + ofs); return val; } /* * 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]); } /* * Unaligned writes are ignored, causing the 8-bit * probe to fail and proceed to the 16-bit probe (which succeeds). */ static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr) { if (!(adr & 1)) *(__u16 *) (map->map_priv_1 + adr) = d.x[0]; } /* * Fast write16 function without the probing check above */ static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr) { *(__u16 *) (map->map_priv_1 + adr) = d.x[0]; } 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); map_word d; dev_set_drvdata(&dev->dev, NULL); if(!info) return 0; /* * This is required for a soft reboot to work. */ d.x[0] = 0xff; ixp4xx_write16(&info->map, d, 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.bankwidth = 2; info->map.name = dev->dev.bus_id; info->map.read = ixp4xx_read16, info->map.write = ixp4xx_probe_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 = 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; /* Use the fast version */ info->map.write = ixp4xx_write16, 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");