diff options
Diffstat (limited to 'drivers/mtd/maps/ixp4xx.c')
| -rw-r--r-- | drivers/mtd/maps/ixp4xx.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/drivers/mtd/maps/ixp4xx.c b/drivers/mtd/maps/ixp4xx.c new file mode 100644 index 000000000000..5afe660aa2c4 --- /dev/null +++ b/drivers/mtd/maps/ixp4xx.c @@ -0,0 +1,259 @@ +/* + * $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"); + |