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275 lines
6.4 KiB
275 lines
6.4 KiB
/*
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* $Id: physmap.c,v 1.39 2005/11/29 14:49:36 gleixner Exp $
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*
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* Normal mappings of chips in physical memory
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*
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* Copyright (C) 2003 MontaVista Software Inc.
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* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
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*
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* 031022 - [jsun] add run-time configure and partition setup
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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/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.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 <linux/mtd/physmap.h>
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#include <asm/io.h>
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struct physmap_flash_info {
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struct mtd_info *mtd;
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struct map_info map;
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struct resource *res;
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#ifdef CONFIG_MTD_PARTITIONS
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int nr_parts;
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struct mtd_partition *parts;
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#endif
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};
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static int physmap_flash_remove(struct platform_device *dev)
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{
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struct physmap_flash_info *info;
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struct physmap_flash_data *physmap_data;
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info = platform_get_drvdata(dev);
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if (info == NULL)
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return 0;
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platform_set_drvdata(dev, NULL);
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physmap_data = dev->dev.platform_data;
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if (info->mtd != NULL) {
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#ifdef CONFIG_MTD_PARTITIONS
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if (info->nr_parts) {
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del_mtd_partitions(info->mtd);
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kfree(info->parts);
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} else if (physmap_data->nr_parts) {
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del_mtd_partitions(info->mtd);
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} else {
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del_mtd_device(info->mtd);
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}
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#else
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del_mtd_device(info->mtd);
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#endif
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map_destroy(info->mtd);
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}
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if (info->map.virt != NULL)
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iounmap(info->map.virt);
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if (info->res != NULL) {
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release_resource(info->res);
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kfree(info->res);
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}
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return 0;
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}
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static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
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#ifdef CONFIG_MTD_PARTITIONS
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static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
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#endif
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static int physmap_flash_probe(struct platform_device *dev)
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{
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struct physmap_flash_data *physmap_data;
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struct physmap_flash_info *info;
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const char **probe_type;
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int err;
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physmap_data = dev->dev.platform_data;
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if (physmap_data == NULL)
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return -ENODEV;
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printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
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(unsigned long long)dev->resource->end - dev->resource->start + 1,
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(unsigned long long)dev->resource->start);
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info = kmalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
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if (info == NULL) {
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err = -ENOMEM;
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goto err_out;
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}
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memset(info, 0, sizeof(*info));
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platform_set_drvdata(dev, info);
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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 == NULL) {
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dev_err(&dev->dev, "Could not reserve memory region\n");
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err = -ENOMEM;
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goto err_out;
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}
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info->map.name = dev->dev.bus_id;
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info->map.phys = dev->resource->start;
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info->map.size = dev->resource->end - dev->resource->start + 1;
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info->map.bankwidth = physmap_data->width;
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info->map.set_vpp = physmap_data->set_vpp;
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info->map.virt = ioremap(info->map.phys, info->map.size);
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if (info->map.virt == NULL) {
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dev_err(&dev->dev, "Failed to ioremap flash region\n");
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err = EIO;
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goto err_out;
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}
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simple_map_init(&info->map);
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probe_type = rom_probe_types;
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for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
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info->mtd = do_map_probe(*probe_type, &info->map);
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if (info->mtd == NULL) {
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dev_err(&dev->dev, "map_probe failed\n");
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err = -ENXIO;
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goto err_out;
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}
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info->mtd->owner = THIS_MODULE;
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#ifdef CONFIG_MTD_PARTITIONS
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err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
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if (err > 0) {
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add_mtd_partitions(info->mtd, info->parts, err);
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return 0;
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}
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if (physmap_data->nr_parts) {
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printk(KERN_NOTICE "Using physmap partition information\n");
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add_mtd_partitions(info->mtd, physmap_data->parts,
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physmap_data->nr_parts);
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return 0;
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}
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#endif
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add_mtd_device(info->mtd);
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return 0;
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err_out:
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physmap_flash_remove(dev);
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return err;
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}
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#ifdef CONFIG_PM
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static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
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{
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struct physmap_flash_info *info = platform_get_drvdata(dev);
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int ret = 0;
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if (info)
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ret = info->mtd->suspend(info->mtd);
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return ret;
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}
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static int physmap_flash_resume(struct platform_device *dev)
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{
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struct physmap_flash_info *info = platform_get_drvdata(dev);
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if (info)
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info->mtd->resume(info->mtd);
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return 0;
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}
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static void physmap_flash_shutdown(struct platform_device *dev)
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{
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struct physmap_flash_info *info = platform_get_drvdata(dev);
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if (info && info->mtd->suspend(info->mtd) == 0)
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info->mtd->resume(info->mtd);
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}
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#endif
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static struct platform_driver physmap_flash_driver = {
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.probe = physmap_flash_probe,
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.remove = physmap_flash_remove,
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#ifdef CONFIG_PM
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.suspend = physmap_flash_suspend,
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.resume = physmap_flash_resume,
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.shutdown = physmap_flash_shutdown,
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#endif
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.driver = {
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.name = "physmap-flash",
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},
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};
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#ifdef CONFIG_MTD_PHYSMAP_LEN
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#if CONFIG_MTD_PHYSMAP_LEN != 0
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#warning using PHYSMAP compat code
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#define PHYSMAP_COMPAT
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#endif
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#endif
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#ifdef PHYSMAP_COMPAT
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static struct physmap_flash_data physmap_flash_data = {
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.width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
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};
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static struct resource physmap_flash_resource = {
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.start = CONFIG_MTD_PHYSMAP_START,
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.end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
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.flags = IORESOURCE_MEM,
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};
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static struct platform_device physmap_flash = {
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.name = "physmap-flash",
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.id = 0,
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.dev = {
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.platform_data = &physmap_flash_data,
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},
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.num_resources = 1,
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.resource = &physmap_flash_resource,
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};
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void physmap_configure(unsigned long addr, unsigned long size,
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int bankwidth, void (*set_vpp)(struct map_info *, int))
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{
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physmap_flash_resource.start = addr;
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physmap_flash_resource.end = addr + size - 1;
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physmap_flash_data.width = bankwidth;
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physmap_flash_data.set_vpp = set_vpp;
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}
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#ifdef CONFIG_MTD_PARTITIONS
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void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
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{
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physmap_flash_data.nr_parts = num_parts;
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physmap_flash_data.parts = parts;
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}
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#endif
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#endif
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static int __init physmap_init(void)
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{
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int err;
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err = platform_driver_register(&physmap_flash_driver);
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#ifdef PHYSMAP_COMPAT
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if (err == 0)
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platform_device_register(&physmap_flash);
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#endif
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return err;
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}
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static void __exit physmap_exit(void)
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{
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#ifdef PHYSMAP_COMPAT
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platform_device_unregister(&physmap_flash);
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#endif
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platform_driver_unregister(&physmap_flash_driver);
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}
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module_init(physmap_init);
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module_exit(physmap_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
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MODULE_DESCRIPTION("Generic configurable MTD map driver");
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