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Commit a2c2fe4b authored by Vitaly Wool's avatar Vitaly Wool Committed by David Woodhouse
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[MTD] of_device-based physmap driver 

inlined below is the patch that adds physmap driver for of_device.
It's an MTD part of the two-part support for flash/ROM devices based
on Open Firmware descriptions. The arch part (currently only PowerPC
which is no surprise) was introduced to powerpc folks earlier and
recently the older version of the powerpc part has been included into
the powerpc.git tree
(see http://www.kernel.org/git/?p=linux/kernel/git/paulus/powerpc.git;a=commitdiff;h=28f9ec349ae47c91768b7bc5607db4442c818e11

).

 drivers/mtd/maps/Kconfig      |    9 +
 drivers/mtd/maps/Makefile     |    1
 drivers/mtd/maps/physmap_of.c |  255 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 265 insertions(+)

Signed-off-by: default avatarVitaly Wool <vwool@ru.mvista.com>
Signed-off-by: default avatarSergey Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
parent f33665d9

drivers/mtd/maps/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -60,6 +60,15 @@ config MTD_PHYSMAP_BANKWIDTH 
	  Ignore this option if you use run-time physmap configuration

	  (i.e., run-time calling physmap_configure()).



config MTD_PHYSMAP_OF

	tristate "Flash device in physical memory map based on OF descirption"

	depends on PPC_OF && (MTD_CFI || MTD_JEDECPROBE || MTD_ROM)

	help

	  This provides a 'mapping' driver which allows the NOR Flash and

	  ROM driver code to communicate with chips which are mapped

	  physically into the CPU's memory. The mapping description here is

	  taken from OF device tree.



config MTD_SUN_UFLASH

	tristate "Sun Microsystems userflash support"

	depends on SPARC && MTD_CFI

drivers/mtd/maps/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ obj-$(CONFIG_MTD_MBX860) += mbx860.o 
obj-$(CONFIG_MTD_CEIVA)		+= ceiva.o

obj-$(CONFIG_MTD_OCTAGON)	+= octagon-5066.o

obj-$(CONFIG_MTD_PHYSMAP)	+= physmap.o

obj-$(CONFIG_MTD_PHYSMAP_OF)	+= physmap_of.o

obj-$(CONFIG_MTD_PNC2000)	+= pnc2000.o

obj-$(CONFIG_MTD_PCMCIA)	+= pcmciamtd.o

obj-$(CONFIG_MTD_RPXLITE)	+= rpxlite.o

drivers/mtd/maps/physmap_of.c

0 → 100644
+255 −0
Original line number Diff line number Diff line 
/*

 * Normal mappings of chips in physical memory for OF devices

 *

 * Copyright (C) 2006 MontaVista Software Inc.

 * Author: Vitaly Wool <vwool@ru.mvista.com>

 *

 * 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/kernel.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/device.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/map.h>

#include <linux/mtd/partitions.h>

#include <linux/mtd/physmap.h>

#include <asm/io.h>

#include <asm/prom.h>

#include <asm/of_device.h>

#include <asm/of_platform.h>



struct physmap_flash_info {

	struct mtd_info		*mtd;

	struct map_info		map;

	struct resource		*res;

#ifdef CONFIG_MTD_PARTITIONS

	int			nr_parts;

	struct mtd_partition	*parts;

#endif

};



static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };

#ifdef CONFIG_MTD_PARTITIONS

static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };

#endif



#ifdef CONFIG_MTD_PARTITIONS

static int parse_flash_partitions(struct device_node *node,

		struct mtd_partition **parts)

{

	int i, plen, retval = -ENOMEM;

	const  u32  *part;

	const  char *name;



	part = get_property(node, "partitions", &plen);

	if (part == NULL)

		goto err;



	retval = plen / (2 * sizeof(u32));

	*parts = kzalloc(retval * sizeof(struct mtd_partition), GFP_KERNEL);

	if (*parts == NULL) {

		printk(KERN_ERR "Can't allocate the flash partition data!\n");

		goto err;

	}



	name = get_property(node, "partition-names", &plen);



	for (i = 0; i < retval; i++) {

		(*parts)[i].offset = *part++;

		(*parts)[i].size   = *part & ~1;

		if (*part++ & 1) /* bit 0 set signifies read only partition */

			(*parts)[i].mask_flags = MTD_WRITEABLE;



		if (name != NULL && plen > 0) {

			int len = strlen(name) + 1;



			(*parts)[i].name = (char *)name;

			plen -= len;

			name += len;

		} else

			(*parts)[i].name = "unnamed";

	}

err:

	return retval;

}

#endif



static int of_physmap_remove(struct of_device *dev)

{

	struct physmap_flash_info *info;



	info = dev_get_drvdata(&dev->dev);

	if (info == NULL)

		return 0;

	dev_set_drvdata(&dev->dev, NULL);



	if (info->mtd != NULL) {

#ifdef CONFIG_MTD_PARTITIONS

		if (info->nr_parts) {

			del_mtd_partitions(info->mtd);

			kfree(info->parts);

		} else {

			del_mtd_device(info->mtd);

		}

#else

		del_mtd_device(info->mtd);

#endif

		map_destroy(info->mtd);

	}



	if (info->map.virt != NULL)

		iounmap(info->map.virt);



	if (info->res != NULL) {

		release_resource(info->res);

		kfree(info->res);

	}



	return 0;

}



static int __devinit of_physmap_probe(struct of_device *dev, const struct of_device_id *match)

{

	struct device_node *dp = dev->node;

	struct resource res;

	struct physmap_flash_info *info;

	const char **probe_type;

	const char *of_probe;

	const u32 *width;

	int err;





	if (of_address_to_resource(dp, 0, &res)) {

		dev_err(&dev->dev, "Can't get the flash mapping!\n");

		err = -EINVAL;

		goto err_out;

	}



       	dev_dbg(&dev->dev, "physmap flash device: %.8llx at %.8llx\n",

	    (unsigned long long)res.end - res.start + 1,

	    (unsigned long long)res.start);



	info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);

	if (info == NULL) {

		err = -ENOMEM;

		goto err_out;

	}

	memset(info, 0, sizeof(*info));



	dev_set_drvdata(&dev->dev, info);



	info->res = request_mem_region(res.start, res.end - res.start + 1,

			dev->dev.bus_id);

	if (info->res == NULL) {

		dev_err(&dev->dev, "Could not reserve memory region\n");

		err = -ENOMEM;

		goto err_out;

	}



	width = get_property(dp, "bank-width", NULL);

	if (width == NULL) {

		dev_err(&dev->dev, "Can't get the flash bank width!\n");

		err = -EINVAL;

		goto err_out;

	}



	info->map.name = dev->dev.bus_id;

	info->map.phys = res.start;

	info->map.size = res.end - res.start + 1;

	info->map.bankwidth = *width;



	info->map.virt = ioremap(info->map.phys, info->map.size);

	if (info->map.virt == NULL) {

		dev_err(&dev->dev, "Failed to ioremap flash region\n");

		err = EIO;

		goto err_out;

	}



	simple_map_init(&info->map);



	of_probe = get_property(dp, "probe-type", NULL);

	if (of_probe == NULL) {

		probe_type = rom_probe_types;

		for (; info->mtd == NULL && *probe_type != NULL; probe_type++)

			info->mtd = do_map_probe(*probe_type, &info->map);

	} else if (!strcmp(of_probe, "CFI"))

		info->mtd = do_map_probe("cfi_probe", &info->map);

	else if (!strcmp(of_probe, "JEDEC"))

		info->mtd = do_map_probe("jedec_probe", &info->map);

	else {

 		if (strcmp(of_probe, "ROM"))

			dev_dbg(&dev->dev, "map_probe: don't know probe type "

			"'%s', mapping as rom\n");

		info->mtd = do_map_probe("mtd_rom", &info->map);

	}

	if (info->mtd == NULL) {

		dev_err(&dev->dev, "map_probe failed\n");

		err = -ENXIO;

		goto err_out;

	}

	info->mtd->owner = THIS_MODULE;



#ifdef CONFIG_MTD_PARTITIONS

	err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);

	if (err > 0) {

		add_mtd_partitions(info->mtd, info->parts, err);

	} else if ((err = parse_flash_partitions(dp, &info->parts)) > 0) {

		dev_info(&dev->dev, "Using OF partition information\n");

		add_mtd_partitions(info->mtd, info->parts, err);

		info->nr_parts = err;

	} else

#endif



	add_mtd_device(info->mtd);

	return 0;



err_out:

	of_physmap_remove(dev);

	return err;



	return 0;





}



static struct of_device_id of_physmap_match[] = {

	{

		.type		= "rom",

		.compatible	= "direct-mapped"

	},

	{ },

};



MODULE_DEVICE_TABLE(of, of_physmap_match);





static struct of_platform_driver of_physmap_flash_driver = {

	.name		= "physmap-flash",

	.match_table	= of_physmap_match,

	.probe		= of_physmap_probe,

	.remove		= of_physmap_remove,

};



static int __init of_physmap_init(void)

{

	return of_register_platform_driver(&of_physmap_flash_driver);

}



static void __exit of_physmap_exit(void)

{

	of_unregister_platform_driver(&of_physmap_flash_driver);

}



module_init(of_physmap_init);

module_exit(of_physmap_exit);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");

MODULE_DESCRIPTION("Configurable MTD map driver for OF");