380 lines
9.5 KiB
C
380 lines
9.5 KiB
C
/*
|
|
* Flash mappings described by the OF (or flattened) device tree
|
|
*
|
|
* Copyright (C) 2006 MontaVista Software Inc.
|
|
* Author: Vitaly Wool <vwool@ru.mvista.com>
|
|
*
|
|
* Revised to handle newer style flash binding by:
|
|
* Copyright (C) 2007 David Gibson, IBM Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/device.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/partitions.h>
|
|
#include <linux/mtd/concat.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/slab.h>
|
|
#include "physmap_of_gemini.h"
|
|
#include "physmap_of_versatile.h"
|
|
|
|
struct of_flash_list {
|
|
struct mtd_info *mtd;
|
|
struct map_info map;
|
|
struct resource *res;
|
|
};
|
|
|
|
struct of_flash {
|
|
struct mtd_info *cmtd;
|
|
int list_size; /* number of elements in of_flash_list */
|
|
struct of_flash_list list[0];
|
|
};
|
|
|
|
static int of_flash_remove(struct platform_device *dev)
|
|
{
|
|
struct of_flash *info;
|
|
int i;
|
|
|
|
info = dev_get_drvdata(&dev->dev);
|
|
if (!info)
|
|
return 0;
|
|
dev_set_drvdata(&dev->dev, NULL);
|
|
|
|
if (info->cmtd) {
|
|
mtd_device_unregister(info->cmtd);
|
|
if (info->cmtd != info->list[0].mtd)
|
|
mtd_concat_destroy(info->cmtd);
|
|
}
|
|
|
|
for (i = 0; i < info->list_size; i++) {
|
|
if (info->list[i].mtd)
|
|
map_destroy(info->list[i].mtd);
|
|
|
|
if (info->list[i].map.virt)
|
|
iounmap(info->list[i].map.virt);
|
|
|
|
if (info->list[i].res) {
|
|
release_resource(info->list[i].res);
|
|
kfree(info->list[i].res);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const char * const rom_probe_types[] = {
|
|
"cfi_probe", "jedec_probe", "map_rom" };
|
|
|
|
/* Helper function to handle probing of the obsolete "direct-mapped"
|
|
* compatible binding, which has an extra "probe-type" property
|
|
* describing the type of flash probe necessary. */
|
|
static struct mtd_info *obsolete_probe(struct platform_device *dev,
|
|
struct map_info *map)
|
|
{
|
|
struct device_node *dp = dev->dev.of_node;
|
|
const char *of_probe;
|
|
struct mtd_info *mtd;
|
|
int i;
|
|
|
|
dev_warn(&dev->dev, "Device tree uses obsolete \"direct-mapped\" "
|
|
"flash binding\n");
|
|
|
|
of_probe = of_get_property(dp, "probe-type", NULL);
|
|
if (!of_probe) {
|
|
for (i = 0; i < ARRAY_SIZE(rom_probe_types); i++) {
|
|
mtd = do_map_probe(rom_probe_types[i], map);
|
|
if (mtd)
|
|
return mtd;
|
|
}
|
|
return NULL;
|
|
} else if (strcmp(of_probe, "CFI") == 0) {
|
|
return do_map_probe("cfi_probe", map);
|
|
} else if (strcmp(of_probe, "JEDEC") == 0) {
|
|
return do_map_probe("jedec_probe", map);
|
|
} else {
|
|
if (strcmp(of_probe, "ROM") != 0)
|
|
dev_warn(&dev->dev, "obsolete_probe: don't know probe "
|
|
"type '%s', mapping as rom\n", of_probe);
|
|
return do_map_probe("map_rom", map);
|
|
}
|
|
}
|
|
|
|
/* When partitions are set we look for a linux,part-probe property which
|
|
specifies the list of partition probers to use. If none is given then the
|
|
default is use. These take precedence over other device tree
|
|
information. */
|
|
static const char * const part_probe_types_def[] = {
|
|
"cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL };
|
|
|
|
static const char * const *of_get_probes(struct device_node *dp)
|
|
{
|
|
const char **res;
|
|
int count;
|
|
|
|
count = of_property_count_strings(dp, "linux,part-probe");
|
|
if (count < 0)
|
|
return part_probe_types_def;
|
|
|
|
res = kzalloc((count + 1) * sizeof(*res), GFP_KERNEL);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
count = of_property_read_string_array(dp, "linux,part-probe", res,
|
|
count);
|
|
if (count < 0)
|
|
return NULL;
|
|
|
|
return res;
|
|
}
|
|
|
|
static void of_free_probes(const char * const *probes)
|
|
{
|
|
if (probes != part_probe_types_def)
|
|
kfree(probes);
|
|
}
|
|
|
|
static const struct of_device_id of_flash_match[];
|
|
static int of_flash_probe(struct platform_device *dev)
|
|
{
|
|
const char * const *part_probe_types;
|
|
const struct of_device_id *match;
|
|
struct device_node *dp = dev->dev.of_node;
|
|
struct resource res;
|
|
struct of_flash *info;
|
|
const char *probe_type;
|
|
const __be32 *width;
|
|
int err;
|
|
int i;
|
|
int count;
|
|
const __be32 *p;
|
|
int reg_tuple_size;
|
|
struct mtd_info **mtd_list = NULL;
|
|
resource_size_t res_size;
|
|
bool map_indirect;
|
|
const char *mtd_name = NULL;
|
|
|
|
match = of_match_device(of_flash_match, &dev->dev);
|
|
if (!match)
|
|
return -EINVAL;
|
|
probe_type = match->data;
|
|
|
|
reg_tuple_size = (of_n_addr_cells(dp) + of_n_size_cells(dp)) * sizeof(u32);
|
|
|
|
of_property_read_string(dp, "linux,mtd-name", &mtd_name);
|
|
|
|
/*
|
|
* Get number of "reg" tuples. Scan for MTD devices on area's
|
|
* described by each "reg" region. This makes it possible (including
|
|
* the concat support) to support the Intel P30 48F4400 chips which
|
|
* consists internally of 2 non-identical NOR chips on one die.
|
|
*/
|
|
p = of_get_property(dp, "reg", &count);
|
|
if (!p || count % reg_tuple_size != 0) {
|
|
dev_err(&dev->dev, "Malformed reg property on %pOF\n",
|
|
dev->dev.of_node);
|
|
err = -EINVAL;
|
|
goto err_flash_remove;
|
|
}
|
|
count /= reg_tuple_size;
|
|
|
|
map_indirect = of_property_read_bool(dp, "no-unaligned-direct-access");
|
|
|
|
err = -ENOMEM;
|
|
info = devm_kzalloc(&dev->dev,
|
|
sizeof(struct of_flash) +
|
|
sizeof(struct of_flash_list) * count, GFP_KERNEL);
|
|
if (!info)
|
|
goto err_flash_remove;
|
|
|
|
dev_set_drvdata(&dev->dev, info);
|
|
|
|
mtd_list = kzalloc(sizeof(*mtd_list) * count, GFP_KERNEL);
|
|
if (!mtd_list)
|
|
goto err_flash_remove;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
err = -ENXIO;
|
|
if (of_address_to_resource(dp, i, &res)) {
|
|
/*
|
|
* Continue with next register tuple if this
|
|
* one is not mappable
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
dev_dbg(&dev->dev, "of_flash device: %pR\n", &res);
|
|
|
|
err = -EBUSY;
|
|
res_size = resource_size(&res);
|
|
info->list[i].res = request_mem_region(res.start, res_size,
|
|
dev_name(&dev->dev));
|
|
if (!info->list[i].res)
|
|
goto err_out;
|
|
|
|
err = -ENXIO;
|
|
width = of_get_property(dp, "bank-width", NULL);
|
|
if (!width) {
|
|
dev_err(&dev->dev, "Can't get bank width from device"
|
|
" tree\n");
|
|
goto err_out;
|
|
}
|
|
|
|
info->list[i].map.name = mtd_name ?: dev_name(&dev->dev);
|
|
info->list[i].map.phys = res.start;
|
|
info->list[i].map.size = res_size;
|
|
info->list[i].map.bankwidth = be32_to_cpup(width);
|
|
info->list[i].map.device_node = dp;
|
|
|
|
err = of_flash_probe_gemini(dev, dp, &info->list[i].map);
|
|
if (err)
|
|
goto err_out;
|
|
err = of_flash_probe_versatile(dev, dp, &info->list[i].map);
|
|
if (err)
|
|
goto err_out;
|
|
|
|
err = -ENOMEM;
|
|
info->list[i].map.virt = ioremap(info->list[i].map.phys,
|
|
info->list[i].map.size);
|
|
if (!info->list[i].map.virt) {
|
|
dev_err(&dev->dev, "Failed to ioremap() flash"
|
|
" region\n");
|
|
goto err_out;
|
|
}
|
|
|
|
simple_map_init(&info->list[i].map);
|
|
|
|
/*
|
|
* On some platforms (e.g. MPC5200) a direct 1:1 mapping
|
|
* may cause problems with JFFS2 usage, as the local bus (LPB)
|
|
* doesn't support unaligned accesses as implemented in the
|
|
* JFFS2 code via memcpy(). By setting NO_XIP, the
|
|
* flash will not be exposed directly to the MTD users
|
|
* (e.g. JFFS2) any more.
|
|
*/
|
|
if (map_indirect)
|
|
info->list[i].map.phys = NO_XIP;
|
|
|
|
if (probe_type) {
|
|
info->list[i].mtd = do_map_probe(probe_type,
|
|
&info->list[i].map);
|
|
} else {
|
|
info->list[i].mtd = obsolete_probe(dev,
|
|
&info->list[i].map);
|
|
}
|
|
|
|
/* Fall back to mapping region as ROM */
|
|
if (!info->list[i].mtd) {
|
|
dev_warn(&dev->dev,
|
|
"do_map_probe() failed for type %s\n",
|
|
probe_type);
|
|
|
|
info->list[i].mtd = do_map_probe("map_rom",
|
|
&info->list[i].map);
|
|
}
|
|
mtd_list[i] = info->list[i].mtd;
|
|
|
|
err = -ENXIO;
|
|
if (!info->list[i].mtd) {
|
|
dev_err(&dev->dev, "do_map_probe() failed\n");
|
|
goto err_out;
|
|
} else {
|
|
info->list_size++;
|
|
}
|
|
info->list[i].mtd->dev.parent = &dev->dev;
|
|
}
|
|
|
|
err = 0;
|
|
info->cmtd = NULL;
|
|
if (info->list_size == 1) {
|
|
info->cmtd = info->list[0].mtd;
|
|
} else if (info->list_size > 1) {
|
|
/*
|
|
* We detected multiple devices. Concatenate them together.
|
|
*/
|
|
info->cmtd = mtd_concat_create(mtd_list, info->list_size,
|
|
dev_name(&dev->dev));
|
|
}
|
|
if (info->cmtd == NULL)
|
|
err = -ENXIO;
|
|
|
|
if (err)
|
|
goto err_out;
|
|
|
|
info->cmtd->dev.parent = &dev->dev;
|
|
mtd_set_of_node(info->cmtd, dp);
|
|
part_probe_types = of_get_probes(dp);
|
|
if (!part_probe_types) {
|
|
err = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
mtd_device_parse_register(info->cmtd, part_probe_types, NULL,
|
|
NULL, 0);
|
|
of_free_probes(part_probe_types);
|
|
|
|
kfree(mtd_list);
|
|
|
|
return 0;
|
|
|
|
err_out:
|
|
kfree(mtd_list);
|
|
err_flash_remove:
|
|
of_flash_remove(dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct of_device_id of_flash_match[] = {
|
|
{
|
|
.compatible = "cfi-flash",
|
|
.data = (void *)"cfi_probe",
|
|
},
|
|
{
|
|
/* FIXME: JEDEC chips can't be safely and reliably
|
|
* probed, although the mtd code gets it right in
|
|
* practice most of the time. We should use the
|
|
* vendor and device ids specified by the binding to
|
|
* bypass the heuristic probe code, but the mtd layer
|
|
* provides, at present, no interface for doing so
|
|
* :(. */
|
|
.compatible = "jedec-flash",
|
|
.data = (void *)"jedec_probe",
|
|
},
|
|
{
|
|
.compatible = "mtd-ram",
|
|
.data = (void *)"map_ram",
|
|
},
|
|
{
|
|
.compatible = "mtd-rom",
|
|
.data = (void *)"map_rom",
|
|
},
|
|
{
|
|
.type = "rom",
|
|
.compatible = "direct-mapped"
|
|
},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_flash_match);
|
|
|
|
static struct platform_driver of_flash_driver = {
|
|
.driver = {
|
|
.name = "of-flash",
|
|
.of_match_table = of_flash_match,
|
|
},
|
|
.probe = of_flash_probe,
|
|
.remove = of_flash_remove,
|
|
};
|
|
|
|
module_platform_driver(of_flash_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");
|
|
MODULE_DESCRIPTION("Device tree based MTD map driver");
|