376 lines
9.3 KiB
C
376 lines
9.3 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/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/concat.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/slab.h>
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struct of_flash_list {
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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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};
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struct of_flash {
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struct mtd_info *cmtd;
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int list_size; /* number of elements in of_flash_list */
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struct of_flash_list list[0];
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};
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static int of_flash_remove(struct platform_device *dev)
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{
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struct of_flash *info;
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int i;
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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->cmtd) {
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mtd_device_unregister(info->cmtd);
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if (info->cmtd != info->list[0].mtd)
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mtd_concat_destroy(info->cmtd);
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}
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for (i = 0; i < info->list_size; i++) {
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if (info->list[i].mtd)
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map_destroy(info->list[i].mtd);
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if (info->list[i].map.virt)
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iounmap(info->list[i].map.virt);
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if (info->list[i].res) {
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release_resource(info->list[i].res);
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kfree(info->list[i].res);
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}
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}
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return 0;
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}
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static const char * const rom_probe_types[] = {
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"cfi_probe", "jedec_probe", "map_rom" };
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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 *obsolete_probe(struct platform_device *dev,
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struct map_info *map)
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{
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struct device_node *dp = dev->dev.of_node;
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const char *of_probe;
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struct mtd_info *mtd;
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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("map_rom", map);
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}
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}
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/* When partitions are set we look for a linux,part-probe property which
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specifies the list of partition probers to use. If none is given then the
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default is use. These take precedence over other device tree
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information. */
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static const char * const part_probe_types_def[] = {
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"cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL };
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static const char * const *of_get_probes(struct device_node *dp)
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{
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const char *cp;
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int cplen;
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unsigned int l;
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unsigned int count;
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const char **res;
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cp = of_get_property(dp, "linux,part-probe", &cplen);
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if (cp == NULL)
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return part_probe_types_def;
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count = 0;
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for (l = 0; l != cplen; l++)
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if (cp[l] == 0)
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count++;
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res = kzalloc((count + 1)*sizeof(*res), GFP_KERNEL);
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count = 0;
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while (cplen > 0) {
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res[count] = cp;
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l = strlen(cp) + 1;
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cp += l;
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cplen -= l;
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count++;
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}
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return res;
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}
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static void of_free_probes(const char * const *probes)
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{
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if (probes != part_probe_types_def)
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kfree(probes);
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}
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static const struct of_device_id of_flash_match[];
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static int of_flash_probe(struct platform_device *dev)
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{
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const char * const *part_probe_types;
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const struct of_device_id *match;
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struct device_node *dp = dev->dev.of_node;
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struct resource res;
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struct of_flash *info;
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const char *probe_type;
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const __be32 *width;
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int err;
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int i;
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int count;
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const __be32 *p;
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int reg_tuple_size;
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struct mtd_info **mtd_list = NULL;
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resource_size_t res_size;
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struct mtd_part_parser_data ppdata;
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bool map_indirect;
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const char *mtd_name = NULL;
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match = of_match_device(of_flash_match, &dev->dev);
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if (!match)
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return -EINVAL;
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probe_type = match->data;
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reg_tuple_size = (of_n_addr_cells(dp) + of_n_size_cells(dp)) * sizeof(u32);
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of_property_read_string(dp, "linux,mtd-name", &mtd_name);
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/*
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* Get number of "reg" tuples. Scan for MTD devices on area's
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* described by each "reg" region. This makes it possible (including
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* the concat support) to support the Intel P30 48F4400 chips which
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* consists internally of 2 non-identical NOR chips on one die.
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*/
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p = of_get_property(dp, "reg", &count);
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if (count % reg_tuple_size != 0) {
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dev_err(&dev->dev, "Malformed reg property on %s\n",
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dev->dev.of_node->full_name);
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err = -EINVAL;
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goto err_flash_remove;
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}
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count /= reg_tuple_size;
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map_indirect = of_property_read_bool(dp, "no-unaligned-direct-access");
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err = -ENOMEM;
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info = devm_kzalloc(&dev->dev,
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sizeof(struct of_flash) +
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sizeof(struct of_flash_list) * count, GFP_KERNEL);
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if (!info)
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goto err_flash_remove;
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dev_set_drvdata(&dev->dev, info);
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mtd_list = kzalloc(sizeof(*mtd_list) * count, GFP_KERNEL);
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if (!mtd_list)
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goto err_flash_remove;
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for (i = 0; i < count; i++) {
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err = -ENXIO;
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if (of_address_to_resource(dp, i, &res)) {
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/*
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* Continue with next register tuple if this
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* one is not mappable
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*/
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continue;
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}
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dev_dbg(&dev->dev, "of_flash device: %pR\n", &res);
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err = -EBUSY;
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res_size = resource_size(&res);
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info->list[i].res = request_mem_region(res.start, res_size,
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dev_name(&dev->dev));
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if (!info->list[i].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"
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" tree\n");
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goto err_out;
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}
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info->list[i].map.name = mtd_name ?: dev_name(&dev->dev);
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info->list[i].map.phys = res.start;
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info->list[i].map.size = res_size;
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info->list[i].map.bankwidth = be32_to_cpup(width);
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info->list[i].map.device_node = dp;
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err = -ENOMEM;
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info->list[i].map.virt = ioremap(info->list[i].map.phys,
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info->list[i].map.size);
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if (!info->list[i].map.virt) {
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dev_err(&dev->dev, "Failed to ioremap() flash"
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" region\n");
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goto err_out;
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}
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simple_map_init(&info->list[i].map);
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/*
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* On some platforms (e.g. MPC5200) a direct 1:1 mapping
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* may cause problems with JFFS2 usage, as the local bus (LPB)
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* doesn't support unaligned accesses as implemented in the
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* JFFS2 code via memcpy(). By setting NO_XIP, the
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* flash will not be exposed directly to the MTD users
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* (e.g. JFFS2) any more.
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*/
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if (map_indirect)
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info->list[i].map.phys = NO_XIP;
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if (probe_type) {
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info->list[i].mtd = do_map_probe(probe_type,
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&info->list[i].map);
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} else {
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info->list[i].mtd = obsolete_probe(dev,
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&info->list[i].map);
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}
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/* Fall back to mapping region as ROM */
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if (!info->list[i].mtd) {
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dev_warn(&dev->dev,
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"do_map_probe() failed for type %s\n",
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probe_type);
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info->list[i].mtd = do_map_probe("map_rom",
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&info->list[i].map);
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}
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mtd_list[i] = info->list[i].mtd;
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err = -ENXIO;
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if (!info->list[i].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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} else {
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info->list_size++;
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}
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info->list[i].mtd->owner = THIS_MODULE;
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info->list[i].mtd->dev.parent = &dev->dev;
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}
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err = 0;
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info->cmtd = NULL;
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if (info->list_size == 1) {
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info->cmtd = info->list[0].mtd;
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} else if (info->list_size > 1) {
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/*
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* We detected multiple devices. Concatenate them together.
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*/
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info->cmtd = mtd_concat_create(mtd_list, info->list_size,
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dev_name(&dev->dev));
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}
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if (info->cmtd == NULL)
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err = -ENXIO;
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if (err)
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goto err_out;
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ppdata.of_node = dp;
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part_probe_types = of_get_probes(dp);
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mtd_device_parse_register(info->cmtd, part_probe_types, &ppdata,
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NULL, 0);
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of_free_probes(part_probe_types);
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kfree(mtd_list);
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return 0;
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err_out:
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kfree(mtd_list);
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err_flash_remove:
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of_flash_remove(dev);
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return err;
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}
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static const 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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.compatible = "mtd-ram",
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.data = (void *)"map_ram",
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},
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{
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.compatible = "mtd-rom",
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.data = (void *)"map_rom",
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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 platform_driver of_flash_driver = {
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.driver = {
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.name = "of-flash",
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.of_match_table = of_flash_match,
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},
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.probe = of_flash_probe,
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.remove = of_flash_remove,
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};
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module_platform_driver(of_flash_driver);
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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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