8d9ae994d8
The latest physmap_of driver has a small error where it will fail the probe with: physmap-flash: probe of fff00000.small-flas failed with error -2 if there are no partition subnodes in the device tree and the old style binding is not used. Since partition definitions are optional, the probe should still succeed. Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Acked-by: David Gibson <david@gibson.dropbear.id.au>
367 lines
8.8 KiB
C
367 lines
8.8 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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* 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/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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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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static int parse_obsolete_partitions(struct of_device *dev,
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struct physmap_flash_info *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 -ENOENT;
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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(struct mtd_partition), GFP_KERNEL);
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if (!info->parts) {
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printk(KERN_ERR "Can't allocate the flash partition data!\n");
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return -ENOMEM;
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}
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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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static int __devinit process_partitions(struct physmap_flash_info *info,
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struct of_device *dev)
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{
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const char *partname;
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static const char *part_probe_types[]
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= { "cmdlinepart", "RedBoot", NULL };
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struct device_node *dp = dev->node, *pp;
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int nr_parts, i;
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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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nr_parts = parse_mtd_partitions(info->mtd, part_probe_types,
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&info->parts, 0);
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if (nr_parts > 0) {
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add_mtd_partitions(info->mtd, info->parts, nr_parts);
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return 0;
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}
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/* First count the subnodes */
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nr_parts = 0;
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for (pp = dp->child; pp; pp = pp->sibling)
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nr_parts++;
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if (nr_parts) {
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info->parts = kzalloc(nr_parts * sizeof(struct mtd_partition),
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GFP_KERNEL);
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if (!info->parts) {
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printk(KERN_ERR "Can't allocate the flash partition data!\n");
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return -ENOMEM;
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}
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for (pp = dp->child, i = 0 ; pp; pp = pp->sibling, i++) {
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const u32 *reg;
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int len;
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reg = of_get_property(pp, "reg", &len);
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if (!reg || (len != 2*sizeof(u32))) {
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dev_err(&dev->dev, "Invalid 'reg' on %s\n",
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dp->full_name);
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kfree(info->parts);
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info->parts = NULL;
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return -EINVAL;
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}
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info->parts[i].offset = reg[0];
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info->parts[i].size = reg[1];
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partname = of_get_property(pp, "label", &len);
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if (!partname)
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partname = of_get_property(pp, "name", &len);
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info->parts[i].name = (char *)partname;
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if (of_get_property(pp, "read-only", &len))
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info->parts[i].mask_flags = MTD_WRITEABLE;
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}
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} else {
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nr_parts = parse_obsolete_partitions(dev, info, dp);
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if (nr_parts == -ENOENT)
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nr_parts = 0;
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}
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if (nr_parts < 0)
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return nr_parts;
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if (nr_parts > 0)
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add_mtd_partitions(info->mtd, info->parts, nr_parts);
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else
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add_mtd_device(info->mtd);
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return 0;
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}
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#else /* MTD_PARTITIONS */
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static int __devinit process_partitions(struct physmap_flash_info *info,
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struct device_node *dev)
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{
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add_mtd_device(info->mtd);
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return 0;
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}
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#endif /* MTD_PARTITIONS */
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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->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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/* 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_dbg(&dev->dev, "obsolete_probe: don't know probe type "
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"'%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_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 = (const char *)match->data;
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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 = of_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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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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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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return process_partitions(info, dev);
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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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.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_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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