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Commit 84253394 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

remove the mg_disk driver 



This drivers was added in 2008, but as far as a I can tell we never had a
single platform that actually registered resources for the platform driver.

It's also been unmaintained for a long time and apparently has a ATA mode
that can be driven using the IDE/libata subsystem.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 3f19cd23

Documentation/blockdev/mflash.txt

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This document describes m[g]flash support in linux.



Contents

  1. Overview

  2. Reserved area configuration

  3. Example of mflash platform driver registration



1. Overview



Mflash and gflash are embedded flash drive. The only difference is mflash is

MCP(Multi Chip Package) device. These two device operate exactly same way.

So the rest mflash repersents mflash and gflash altogether.



Internally, mflash has nand flash and other hardware logics and supports

2 different operation (ATA, IO) modes. ATA mode doesn't need any new

driver and currently works well under standard IDE subsystem. Actually it's

one chip SSD. IO mode is ATA-like custom mode for the host that doesn't have

IDE interface.



Following are brief descriptions about IO mode.

A. IO mode based on ATA protocol and uses some custom command. (read confirm,

write confirm)

B. IO mode uses SRAM bus interface.

C. IO mode supports 4kB boot area, so host can boot from mflash.



2. Reserved area configuration

If host boot from mflash, usually needs raw area for boot loader image. All of

the mflash's block device operation will be taken this value as start offset.

Note that boot loader's size of reserved area and kernel configuration value

must be same.



3. Example of mflash platform driver registration

Working mflash is very straight forward. Adding platform device stuff to board

configuration file is all. Here is some pseudo example.



static struct mg_drv_data mflash_drv_data = {

	/* If you want to polling driver set to 1 */

	.use_polling = 0,

	/* device attribution */

	.dev_attr = MG_BOOT_DEV

};



static struct resource mg_mflash_rsc[] = {

	/* Base address of mflash */

	[0] = {

		.start = 0x08000000,

		.end = 0x08000000 + SZ_64K - 1,

		.flags = IORESOURCE_MEM

	},

	/* mflash interrupt pin */

	[1] = {

		.start = IRQ_GPIO(84),

		.end = IRQ_GPIO(84),

		.flags = IORESOURCE_IRQ

	},

	/* mflash reset pin */

	[2] = {

		.start = 43,

		.end = 43,

		.name = MG_RST_PIN,

		.flags = IORESOURCE_IO

	},

	/* mflash reset-out pin

	 * If you use mflash as storage device (i.e. other than MG_BOOT_DEV),

	 * should assign this */

	[3] = {

		.start = 51,

		.end = 51,

		.name = MG_RSTOUT_PIN,

		.flags = IORESOURCE_IO

	}

};



static struct platform_device mflash_dev = {

	.name = MG_DEV_NAME,

	.id = -1,

	.dev = {

		.platform_data = &mflash_drv_data,

	},

	.num_resources = ARRAY_SIZE(mg_mflash_rsc),

	.resource = mg_mflash_rsc

};



platform_device_register(&mflash_dev);

drivers/block/Kconfig

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@@ -434,23 +434,6 @@ config ATA_OVER_ETH 
	This driver provides Support for ATA over Ethernet block

	devices like the Coraid EtherDrive (R) Storage Blade.



config MG_DISK

	tristate "mGine mflash, gflash support"

	depends on ARM && GPIOLIB

	help

	  mGine mFlash(gFlash) block device driver



config MG_DISK_RES

	int "Size of reserved area before MBR"

	depends on MG_DISK

	default 0

	help

	  Define size of reserved area that usually used for boot. Unit is KB.

	  All of the block device operation will be taken this value as start

	  offset

	  Examples:

			1024 => 1 MB



config SUNVDC

	tristate "Sun Virtual Disk Client support"

	depends on SUN_LDOMS

drivers/block/Makefile

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@@ -19,7 +19,6 @@ obj-$(CONFIG_BLK_CPQ_CISS_DA) += cciss.o 
obj-$(CONFIG_BLK_DEV_DAC960)	+= DAC960.o

obj-$(CONFIG_XILINX_SYSACE)	+= xsysace.o

obj-$(CONFIG_CDROM_PKTCDVD)	+= pktcdvd.o

obj-$(CONFIG_MG_DISK)		+= mg_disk.o

obj-$(CONFIG_SUNVDC)		+= sunvdc.o

obj-$(CONFIG_BLK_DEV_SKD)	+= skd.o

obj-$(CONFIG_BLK_DEV_OSD)	+= osdblk.o

drivers/block/mg_disk.c

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File deleted.

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include/linux/mg_disk.h

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/*

 *  include/linux/mg_disk.c

 *

 *  Private data for mflash platform driver

 *

 * (c) 2008 mGine Co.,LTD

 * (c) 2008 unsik Kim <donari75@gmail.com>

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License version 2 as

 *  published by the Free Software Foundation.

 */



#ifndef __MG_DISK_H__

#define __MG_DISK_H__



/* name for platform device */

#define MG_DEV_NAME "mg_disk"



/* names of GPIO resource */

#define MG_RST_PIN	"mg_rst"

/* except MG_BOOT_DEV, reset-out pin should be assigned */

#define MG_RSTOUT_PIN	"mg_rstout"



/* device attribution */

/* use mflash as boot device */

#define MG_BOOT_DEV		(1 << 0)

/* use mflash as storage device */

#define MG_STORAGE_DEV		(1 << 1)

/* same as MG_STORAGE_DEV, but bootloader already done reset sequence */

#define MG_STORAGE_DEV_SKIP_RST	(1 << 2)



/* private driver data */

struct mg_drv_data {

	/* disk resource */

	u32 use_polling;



	/* device attribution */

	u32 dev_attr;



	/* internally used */

	void *host;

};



#endif