278 lines
6.6 KiB
C
278 lines
6.6 KiB
C
/*
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* $Id: ixp2000.c,v 1.6 2005/03/18 14:07:46 gleixner Exp $
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*
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* drivers/mtd/maps/ixp2000.c
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*
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* Mapping for the Intel XScale IXP2000 based systems
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*
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* Copyright (C) 2002 Intel Corp.
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* Copyright (C) 2003-2004 MontaVista Software, Inc.
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*
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* Original Author: Naeem M Afzal <naeem.m.afzal@intel.com>
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* Maintainer: Deepak Saxena <dsaxena@plexity.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <asm/hardware.h>
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#include <asm/mach/flash.h>
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#include <linux/reboot.h>
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struct ixp2000_flash_info {
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struct mtd_info *mtd;
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struct map_info map;
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struct mtd_partition *partitions;
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struct resource *res;
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int nr_banks;
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};
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static inline unsigned long flash_bank_setup(struct map_info *map, unsigned long ofs)
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{
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unsigned long (*set_bank)(unsigned long) =
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(unsigned long(*)(unsigned long))map->map_priv_2;
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return (set_bank ? set_bank(ofs) : ofs);
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}
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#ifdef __ARMEB__
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/*
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* Rev A0 and A1 of IXP2400 silicon have a broken addressing unit which
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* causes the lower address bits to be XORed with 0x11 on 8 bit accesses
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* and XORed with 0x10 on 16 bit accesses. See the spec update, erratum 44.
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*/
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static int erratum44_workaround = 0;
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static inline unsigned long address_fix8_write(unsigned long addr)
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{
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if (erratum44_workaround) {
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return (addr ^ 3);
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}
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return addr;
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}
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#else
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#define address_fix8_write(x) (x)
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#endif
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static map_word ixp2000_flash_read8(struct map_info *map, unsigned long ofs)
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{
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map_word val;
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val.x[0] = *((u8 *)(map->map_priv_1 + flash_bank_setup(map, ofs)));
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return val;
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}
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/*
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* We can't use the standard memcpy due to the broken SlowPort
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* address translation on rev A0 and A1 silicon and the fact that
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* we have banked flash.
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*/
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static void ixp2000_flash_copy_from(struct map_info *map, void *to,
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unsigned long from, ssize_t len)
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{
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from = flash_bank_setup(map, from);
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while(len--)
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*(__u8 *) to++ = *(__u8 *)(map->map_priv_1 + from++);
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}
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static void ixp2000_flash_write8(struct map_info *map, map_word d, unsigned long ofs)
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{
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*(__u8 *) (address_fix8_write(map->map_priv_1 +
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flash_bank_setup(map, ofs))) = d.x[0];
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}
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static void ixp2000_flash_copy_to(struct map_info *map, unsigned long to,
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const void *from, ssize_t len)
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{
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to = flash_bank_setup(map, to);
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while(len--) {
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unsigned long tmp = address_fix8_write(map->map_priv_1 + to++);
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*(__u8 *)(tmp) = *(__u8 *)(from++);
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}
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}
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static int ixp2000_flash_remove(struct device *_dev)
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{
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struct platform_device *dev = to_platform_device(_dev);
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struct flash_platform_data *plat = dev->dev.platform_data;
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struct ixp2000_flash_info *info = dev_get_drvdata(&dev->dev);
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dev_set_drvdata(&dev->dev, NULL);
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if(!info)
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return 0;
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if (info->mtd) {
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del_mtd_partitions(info->mtd);
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map_destroy(info->mtd);
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}
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if (info->map.map_priv_1)
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iounmap((void *) info->map.map_priv_1);
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if (info->partitions) {
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kfree(info->partitions); }
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if (info->res) {
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release_resource(info->res);
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kfree(info->res);
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}
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if (plat->exit)
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plat->exit();
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return 0;
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}
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static int ixp2000_flash_probe(struct device *_dev)
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{
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static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
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struct platform_device *dev = to_platform_device(_dev);
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struct ixp2000_flash_data *ixp_data = dev->dev.platform_data;
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struct flash_platform_data *plat;
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struct ixp2000_flash_info *info;
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unsigned long window_size;
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int err = -1;
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if (!ixp_data)
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return -ENODEV;
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plat = ixp_data->platform_data;
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if (!plat)
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return -ENODEV;
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window_size = dev->resource->end - dev->resource->start + 1;
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dev_info(_dev, "Probe of IXP2000 flash(%d banks x %dMiB)\n",
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ixp_data->nr_banks, ((u32)window_size >> 20));
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if (plat->width != 1) {
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dev_err(_dev, "IXP2000 MTD map only supports 8-bit mode, asking for %d\n",
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plat->width * 8);
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return -EIO;
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}
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info = kmalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL);
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if(!info) {
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err = -ENOMEM;
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goto Error;
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}
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memzero(info, sizeof(struct ixp2000_flash_info));
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dev_set_drvdata(&dev->dev, info);
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/*
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* Tell the MTD layer we're not 1:1 mapped so that it does
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* not attempt to do a direct access on us.
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*/
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info->map.phys = NO_XIP;
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info->nr_banks = ixp_data->nr_banks;
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info->map.size = ixp_data->nr_banks * window_size;
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info->map.bankwidth = 1;
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/*
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* map_priv_2 is used to store a ptr to to the bank_setup routine
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*/
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info->map.map_priv_2 = (void __iomem *) ixp_data->bank_setup;
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info->map.name = dev->dev.bus_id;
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info->map.read = ixp2000_flash_read8;
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info->map.write = ixp2000_flash_write8;
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info->map.copy_from = ixp2000_flash_copy_from;
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info->map.copy_to = ixp2000_flash_copy_to;
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info->res = request_mem_region(dev->resource->start,
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dev->resource->end - dev->resource->start + 1,
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dev->dev.bus_id);
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if (!info->res) {
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dev_err(_dev, "Could not reserve memory region\n");
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err = -ENOMEM;
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goto Error;
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}
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info->map.map_priv_1 = ioremap(dev->resource->start,
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dev->resource->end - dev->resource->start + 1);
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if (!info->map.map_priv_1) {
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dev_err(_dev, "Failed to ioremap flash region\n");
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err = -EIO;
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goto Error;
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}
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#if defined(__ARMEB__)
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/*
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* Enable erratum 44 workaround for NPUs with broken slowport
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*/
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erratum44_workaround = ixp2000_has_broken_slowport();
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dev_info(_dev, "Erratum 44 workaround %s\n",
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erratum44_workaround ? "enabled" : "disabled");
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#endif
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info->mtd = do_map_probe(plat->map_name, &info->map);
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if (!info->mtd) {
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dev_err(_dev, "map_probe failed\n");
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err = -ENXIO;
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goto Error;
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}
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info->mtd->owner = THIS_MODULE;
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err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
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if (err > 0) {
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err = add_mtd_partitions(info->mtd, info->partitions, err);
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if(err)
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dev_err(_dev, "Could not parse partitions\n");
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}
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if (err)
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goto Error;
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return 0;
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Error:
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ixp2000_flash_remove(_dev);
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return err;
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}
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static struct device_driver ixp2000_flash_driver = {
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.name = "IXP2000-Flash",
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.bus = &platform_bus_type,
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.probe = &ixp2000_flash_probe,
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.remove = &ixp2000_flash_remove
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};
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static int __init ixp2000_flash_init(void)
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{
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return driver_register(&ixp2000_flash_driver);
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}
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static void __exit ixp2000_flash_exit(void)
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{
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driver_unregister(&ixp2000_flash_driver);
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}
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module_init(ixp2000_flash_init);
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module_exit(ixp2000_flash_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
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