306 lines
7.3 KiB
C
306 lines
7.3 KiB
C
/*
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* Flash mappings described by the OF (or flattened) device tree
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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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* Revised to handle newer style flash binding by:
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* Copyright (C) 2007 David Gibson, IBM Corporation.
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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/init.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/of.h>
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#include <linux/of_platform.h>
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struct of_flash {
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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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struct mtd_partition *parts;
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#endif
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};
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#ifdef CONFIG_MTD_PARTITIONS
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#define OF_FLASH_PARTS(info) ((info)->parts)
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static int parse_obsolete_partitions(struct of_device *dev,
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struct of_flash *info,
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struct device_node *dp)
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{
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int i, plen, nr_parts;
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const struct {
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u32 offset, len;
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} *part;
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const char *names;
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part = of_get_property(dp, "partitions", &plen);
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if (!part)
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return 0; /* No partitions found */
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dev_warn(&dev->dev, "Device tree uses obsolete partition map binding\n");
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nr_parts = plen / sizeof(part[0]);
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info->parts = kzalloc(nr_parts * sizeof(*info->parts), GFP_KERNEL);
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if (!info->parts)
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return -ENOMEM;
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names = of_get_property(dp, "partition-names", &plen);
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for (i = 0; i < nr_parts; i++) {
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info->parts[i].offset = part->offset;
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info->parts[i].size = part->len & ~1;
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if (part->len & 1) /* bit 0 set signifies read only partition */
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info->parts[i].mask_flags = MTD_WRITEABLE;
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if (names && (plen > 0)) {
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int len = strlen(names) + 1;
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info->parts[i].name = (char *)names;
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plen -= len;
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names += len;
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} else {
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info->parts[i].name = "unnamed";
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}
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part++;
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}
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return nr_parts;
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}
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#else /* MTD_PARTITIONS */
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#define OF_FLASH_PARTS(info) (0)
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#define parse_partitions(info, dev) (0)
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#endif /* MTD_PARTITIONS */
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static int of_flash_remove(struct of_device *dev)
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{
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struct of_flash *info;
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info = dev_get_drvdata(&dev->dev);
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if (!info)
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return 0;
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dev_set_drvdata(&dev->dev, NULL);
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if (info->mtd) {
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if (OF_FLASH_PARTS(info)) {
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del_mtd_partitions(info->mtd);
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kfree(OF_FLASH_PARTS(info));
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} else {
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del_mtd_device(info->mtd);
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}
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map_destroy(info->mtd);
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}
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if (info->map.virt)
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iounmap(info->map.virt);
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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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return 0;
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}
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/* Helper function to handle probing of the obsolete "direct-mapped"
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* compatible binding, which has an extra "probe-type" property
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* describing the type of flash probe necessary. */
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static struct mtd_info * __devinit obsolete_probe(struct of_device *dev,
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struct map_info *map)
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{
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struct device_node *dp = dev->node;
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const char *of_probe;
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struct mtd_info *mtd;
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static const char *rom_probe_types[]
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= { "cfi_probe", "jedec_probe", "map_rom"};
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int i;
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dev_warn(&dev->dev, "Device tree uses obsolete \"direct-mapped\" "
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"flash binding\n");
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of_probe = of_get_property(dp, "probe-type", NULL);
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if (!of_probe) {
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for (i = 0; i < ARRAY_SIZE(rom_probe_types); i++) {
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mtd = do_map_probe(rom_probe_types[i], map);
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if (mtd)
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return mtd;
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}
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return NULL;
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} else if (strcmp(of_probe, "CFI") == 0) {
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return do_map_probe("cfi_probe", map);
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} else if (strcmp(of_probe, "JEDEC") == 0) {
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return do_map_probe("jedec_probe", map);
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} else {
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if (strcmp(of_probe, "ROM") != 0)
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dev_warn(&dev->dev, "obsolete_probe: don't know probe "
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"type '%s', mapping as rom\n", of_probe);
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return do_map_probe("mtd_rom", map);
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}
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}
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static int __devinit of_flash_probe(struct of_device *dev,
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const struct of_device_id *match)
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{
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#ifdef CONFIG_MTD_PARTITIONS
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static const char *part_probe_types[]
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= { "cmdlinepart", "RedBoot", NULL };
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#endif
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struct device_node *dp = dev->node;
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struct resource res;
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struct of_flash *info;
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const char *probe_type = match->data;
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const u32 *width;
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int err;
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err = -ENXIO;
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if (of_address_to_resource(dp, 0, &res)) {
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dev_err(&dev->dev, "Can't get IO address from device tree\n");
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goto err_out;
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}
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dev_dbg(&dev->dev, "of_flash device: %.8llx-%.8llx\n",
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(unsigned long long)res.start, (unsigned long long)res.end);
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err = -ENOMEM;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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goto err_out;
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dev_set_drvdata(&dev->dev, info);
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err = -EBUSY;
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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)
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goto err_out;
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err = -ENXIO;
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width = of_get_property(dp, "bank-width", NULL);
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if (!width) {
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dev_err(&dev->dev, "Can't get bank width from device tree\n");
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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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err = -ENOMEM;
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info->map.virt = ioremap(info->map.phys, info->map.size);
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if (!info->map.virt) {
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dev_err(&dev->dev, "Failed to ioremap() flash region\n");
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goto err_out;
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}
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simple_map_init(&info->map);
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if (probe_type)
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info->mtd = do_map_probe(probe_type, &info->map);
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else
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info->mtd = obsolete_probe(dev, &info->map);
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err = -ENXIO;
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if (!info->mtd) {
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dev_err(&dev->dev, "do_map_probe() failed\n");
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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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/* First look for RedBoot table or partitions on the command
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* line, these take precedence over device tree information */
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err = parse_mtd_partitions(info->mtd, part_probe_types,
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&info->parts, 0);
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if (err < 0)
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return err;
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#ifdef CONFIG_MTD_OF_PARTS
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if (err == 0) {
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err = of_mtd_parse_partitions(&dev->dev, info->mtd,
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dp, &info->parts);
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if (err < 0)
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return err;
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}
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#endif
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if (err == 0) {
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err = parse_obsolete_partitions(dev, info, dp);
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if (err < 0)
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return err;
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}
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if (err > 0)
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add_mtd_partitions(info->mtd, info->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_flash_remove(dev);
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return err;
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}
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static struct of_device_id of_flash_match[] = {
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{
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.compatible = "cfi-flash",
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.data = (void *)"cfi_probe",
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},
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{
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/* FIXME: JEDEC chips can't be safely and reliably
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* probed, although the mtd code gets it right in
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* practice most of the time. We should use the
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* vendor and device ids specified by the binding to
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* bypass the heuristic probe code, but the mtd layer
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* provides, at present, no interface for doing so
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* :(. */
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.compatible = "jedec-flash",
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.data = (void *)"jedec_probe",
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},
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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_flash_match);
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static struct of_platform_driver of_flash_driver = {
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.name = "of-flash",
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.match_table = of_flash_match,
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.probe = of_flash_probe,
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.remove = of_flash_remove,
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};
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static int __init of_flash_init(void)
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{
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return of_register_platform_driver(&of_flash_driver);
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}
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static void __exit of_flash_exit(void)
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{
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of_unregister_platform_driver(&of_flash_driver);
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}
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module_init(of_flash_init);
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module_exit(of_flash_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("Device tree based MTD map driver");
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