256 lines
6.1 KiB
C
256 lines
6.1 KiB
C
/*
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* Normal mappings of chips in physical memory for OF devices
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*
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* Copyright (C) 2006 MontaVista Software Inc.
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* Author: Vitaly Wool <vwool@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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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/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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#include <asm/prom.h>
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#include <asm/of_device.h>
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#include <asm/of_platform.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 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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#ifdef CONFIG_MTD_PARTITIONS
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static int parse_flash_partitions(struct device_node *node,
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struct mtd_partition **parts)
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{
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int i, plen, retval = -ENOMEM;
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const u32 *part;
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const char *name;
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part = get_property(node, "partitions", &plen);
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if (part == NULL)
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goto err;
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retval = plen / (2 * sizeof(u32));
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*parts = kzalloc(retval * sizeof(struct mtd_partition), GFP_KERNEL);
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if (*parts == NULL) {
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printk(KERN_ERR "Can't allocate the flash partition data!\n");
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goto err;
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}
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name = get_property(node, "partition-names", &plen);
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for (i = 0; i < retval; i++) {
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(*parts)[i].offset = *part++;
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(*parts)[i].size = *part & ~1;
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if (*part++ & 1) /* bit 0 set signifies read only partition */
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(*parts)[i].mask_flags = MTD_WRITEABLE;
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if (name != NULL && plen > 0) {
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int len = strlen(name) + 1;
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(*parts)[i].name = (char *)name;
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plen -= len;
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name += len;
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} else
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(*parts)[i].name = "unnamed";
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}
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err:
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return retval;
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}
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#endif
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static int of_physmap_remove(struct of_device *dev)
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{
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struct physmap_flash_info *info;
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info = dev_get_drvdata(&dev->dev);
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if (info == NULL)
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return 0;
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dev_set_drvdata(&dev->dev, NULL);
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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 {
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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 int __devinit of_physmap_probe(struct of_device *dev, const struct of_device_id *match)
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{
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struct device_node *dp = dev->node;
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struct resource res;
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struct physmap_flash_info *info;
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const char **probe_type;
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const char *of_probe;
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const u32 *width;
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int err;
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if (of_address_to_resource(dp, 0, &res)) {
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dev_err(&dev->dev, "Can't get the flash mapping!\n");
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err = -EINVAL;
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goto err_out;
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}
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dev_dbg(&dev->dev, "physmap flash device: %.8llx at %.8llx\n",
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(unsigned long long)res.end - res.start + 1,
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(unsigned long long)res.start);
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info = kzalloc(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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dev_set_drvdata(&dev->dev, info);
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info->res = request_mem_region(res.start, res.end - res.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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width = get_property(dp, "bank-width", NULL);
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if (width == NULL) {
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dev_err(&dev->dev, "Can't get the flash bank width!\n");
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err = -EINVAL;
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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 = res.start;
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info->map.size = res.end - res.start + 1;
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info->map.bankwidth = *width;
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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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of_probe = get_property(dp, "probe-type", NULL);
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if (of_probe == NULL) {
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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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} else if (!strcmp(of_probe, "CFI"))
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info->mtd = do_map_probe("cfi_probe", &info->map);
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else if (!strcmp(of_probe, "JEDEC"))
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info->mtd = do_map_probe("jedec_probe", &info->map);
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else {
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if (strcmp(of_probe, "ROM"))
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dev_dbg(&dev->dev, "map_probe: don't know probe type "
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"'%s', mapping as rom\n");
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info->mtd = do_map_probe("mtd_rom", &info->map);
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}
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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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} else if ((err = parse_flash_partitions(dp, &info->parts)) > 0) {
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dev_info(&dev->dev, "Using OF partition information\n");
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add_mtd_partitions(info->mtd, info->parts, err);
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info->nr_parts = err;
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} else
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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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of_physmap_remove(dev);
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return err;
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return 0;
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}
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static struct of_device_id of_physmap_match[] = {
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{
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.type = "rom",
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.compatible = "direct-mapped"
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},
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{ },
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};
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MODULE_DEVICE_TABLE(of, of_physmap_match);
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static struct of_platform_driver of_physmap_flash_driver = {
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.name = "physmap-flash",
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.match_table = of_physmap_match,
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.probe = of_physmap_probe,
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.remove = of_physmap_remove,
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};
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static int __init of_physmap_init(void)
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{
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return of_register_platform_driver(&of_physmap_flash_driver);
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}
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static void __exit of_physmap_exit(void)
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{
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of_unregister_platform_driver(&of_physmap_flash_driver);
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}
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module_init(of_physmap_init);
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module_exit(of_physmap_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");
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MODULE_DESCRIPTION("Configurable MTD map driver for OF");
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