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: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
Jens Axboe
parent
3f19cd23f3
commit
8425339492
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@ -1,84 +0,0 @@
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This document describes m[g]flash support in linux.
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Contents
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1. Overview
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2. Reserved area configuration
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3. Example of mflash platform driver registration
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1. Overview
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Mflash and gflash are embedded flash drive. The only difference is mflash is
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MCP(Multi Chip Package) device. These two device operate exactly same way.
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So the rest mflash repersents mflash and gflash altogether.
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Internally, mflash has nand flash and other hardware logics and supports
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2 different operation (ATA, IO) modes. ATA mode doesn't need any new
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driver and currently works well under standard IDE subsystem. Actually it's
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one chip SSD. IO mode is ATA-like custom mode for the host that doesn't have
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IDE interface.
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Following are brief descriptions about IO mode.
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A. IO mode based on ATA protocol and uses some custom command. (read confirm,
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write confirm)
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B. IO mode uses SRAM bus interface.
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C. IO mode supports 4kB boot area, so host can boot from mflash.
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2. Reserved area configuration
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If host boot from mflash, usually needs raw area for boot loader image. All of
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the mflash's block device operation will be taken this value as start offset.
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Note that boot loader's size of reserved area and kernel configuration value
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must be same.
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3. Example of mflash platform driver registration
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Working mflash is very straight forward. Adding platform device stuff to board
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configuration file is all. Here is some pseudo example.
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static struct mg_drv_data mflash_drv_data = {
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/* If you want to polling driver set to 1 */
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.use_polling = 0,
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/* device attribution */
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.dev_attr = MG_BOOT_DEV
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};
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static struct resource mg_mflash_rsc[] = {
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/* Base address of mflash */
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[0] = {
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.start = 0x08000000,
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.end = 0x08000000 + SZ_64K - 1,
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.flags = IORESOURCE_MEM
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},
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/* mflash interrupt pin */
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[1] = {
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.start = IRQ_GPIO(84),
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.end = IRQ_GPIO(84),
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.flags = IORESOURCE_IRQ
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},
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/* mflash reset pin */
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[2] = {
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.start = 43,
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.end = 43,
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.name = MG_RST_PIN,
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.flags = IORESOURCE_IO
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},
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/* mflash reset-out pin
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* If you use mflash as storage device (i.e. other than MG_BOOT_DEV),
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* should assign this */
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[3] = {
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.start = 51,
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.end = 51,
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.name = MG_RSTOUT_PIN,
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.flags = IORESOURCE_IO
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}
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};
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static struct platform_device mflash_dev = {
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.name = MG_DEV_NAME,
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.id = -1,
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.dev = {
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.platform_data = &mflash_drv_data,
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},
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.num_resources = ARRAY_SIZE(mg_mflash_rsc),
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.resource = mg_mflash_rsc
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};
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platform_device_register(&mflash_dev);
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@ -434,23 +434,6 @@ config ATA_OVER_ETH
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This driver provides Support for ATA over Ethernet block
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devices like the Coraid EtherDrive (R) Storage Blade.
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config MG_DISK
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tristate "mGine mflash, gflash support"
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depends on ARM && GPIOLIB
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help
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mGine mFlash(gFlash) block device driver
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config MG_DISK_RES
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int "Size of reserved area before MBR"
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depends on MG_DISK
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default 0
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help
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Define size of reserved area that usually used for boot. Unit is KB.
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All of the block device operation will be taken this value as start
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offset
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Examples:
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1024 => 1 MB
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config SUNVDC
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tristate "Sun Virtual Disk Client support"
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depends on SUN_LDOMS
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@ -19,7 +19,6 @@ obj-$(CONFIG_BLK_CPQ_CISS_DA) += cciss.o
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obj-$(CONFIG_BLK_DEV_DAC960) += DAC960.o
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obj-$(CONFIG_XILINX_SYSACE) += xsysace.o
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obj-$(CONFIG_CDROM_PKTCDVD) += pktcdvd.o
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obj-$(CONFIG_MG_DISK) += mg_disk.o
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obj-$(CONFIG_SUNVDC) += sunvdc.o
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obj-$(CONFIG_BLK_DEV_SKD) += skd.o
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obj-$(CONFIG_BLK_DEV_OSD) += osdblk.o
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File diff suppressed because it is too large
Load Diff
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@ -1,45 +0,0 @@
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/*
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* include/linux/mg_disk.c
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*
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* Private data for mflash platform driver
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*
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* (c) 2008 mGine Co.,LTD
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* (c) 2008 unsik Kim <donari75@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __MG_DISK_H__
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#define __MG_DISK_H__
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/* name for platform device */
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#define MG_DEV_NAME "mg_disk"
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/* names of GPIO resource */
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#define MG_RST_PIN "mg_rst"
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/* except MG_BOOT_DEV, reset-out pin should be assigned */
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#define MG_RSTOUT_PIN "mg_rstout"
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/* device attribution */
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/* use mflash as boot device */
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#define MG_BOOT_DEV (1 << 0)
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/* use mflash as storage device */
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#define MG_STORAGE_DEV (1 << 1)
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/* same as MG_STORAGE_DEV, but bootloader already done reset sequence */
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#define MG_STORAGE_DEV_SKIP_RST (1 << 2)
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/* private driver data */
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struct mg_drv_data {
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/* disk resource */
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u32 use_polling;
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/* device attribution */
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u32 dev_attr;
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/* internally used */
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void *host;
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};
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#endif
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