mtd: maps: Get rid of the latch-addr-flash driver

Looks like this driver was initially added to support the NOR on the
DA830-EVM (Davinci) board, but the board file update was never merged.

Keeping unused drivers just adds to the maintenance burden, so let's
remove it if nobody uses it.

Cc: David Griego <[e-mail]>
Cc: Aleksey Makarov <[e-mail]>
Cc: Sergei Shtylyov <[e-mail]>
Cc: Savinay Dharmappa <[e-mail]>
Signed-off-by: Boris Brezillon <[e-mail]>
Acked-by: Sekhar Nori <[e-mail]>

drivers/mtd/maps/Kconfig

···
 
 	  When built as a module, it will be called pismo.ko
 
-config MTD_LATCH_ADDR
-	tristate "Latch-assisted Flash Chip Support"
-	depends on MTD_COMPLEX_MAPPINGS
-	help
-	  Map driver which allows flashes to be partially physically addressed
-	  and have the upper address lines set by a board specific code.
-
-	  If compiled as a module, it will be called latch-addr-flash.
-
 endmenu

drivers/mtd/maps/Makefile

···
 obj-$(CONFIG_MTD_INTEL_VR_NOR)	+= intel_vr_nor.o
 obj-$(CONFIG_MTD_RBTX4939)	+= rbtx4939-flash.o
 obj-$(CONFIG_MTD_VMU)		+= vmu-flash.o
-obj-$(CONFIG_MTD_LATCH_ADDR)	+= latch-addr-flash.o
 obj-$(CONFIG_MTD_LANTIQ)	+= lantiq-flash.o

drivers/mtd/maps/latch-addr-flash.c

···
-/*
- * Interface for NOR flash driver whose high address lines are latched
- *
- * Copyright © 2000 Nicolas Pitre <[e-mail]>
- * Copyright © 2005-2008 Analog Devices Inc.
- * Copyright © 2008 MontaVista Software, Inc. <[e-mail]>
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2. This program is licensed "as is" without any warranty of any
- * kind, whether express or implied.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/map.h>
-#include <linux/mtd/partitions.h>
-#include <linux/platform_device.h>
-#include <linux/mtd/latch-addr-flash.h>
-#include <linux/slab.h>
-
-#define DRIVER_NAME "latch-addr-flash"
-
-struct latch_addr_flash_info {
-	struct mtd_info		*mtd;
-	struct map_info		map;
-	struct resource		*res;
-
-	void			(*set_window)(unsigned long offset, void *data);
-	void			*data;
-
-	/* cache; could be found out of res */
-	unsigned long		win_mask;
-
-	spinlock_t		lock;
-};
-
-static map_word lf_read(struct map_info *map, unsigned long ofs)
-{
-	struct latch_addr_flash_info *info;
-	map_word datum;
-
-	info = (struct latch_addr_flash_info *)map->map_priv_1;
-
-	spin_lock(&info->lock);
-
-	info->set_window(ofs, info->data);
-	datum = inline_map_read(map, info->win_mask & ofs);
-
-	spin_unlock(&info->lock);
-
-	return datum;
-}
-
-static void lf_write(struct map_info *map, map_word datum, unsigned long ofs)
-{
-	struct latch_addr_flash_info *info;
-
-	info = (struct latch_addr_flash_info *)map->map_priv_1;
-
-	spin_lock(&info->lock);
-
-	info->set_window(ofs, info->data);
-	inline_map_write(map, datum, info->win_mask & ofs);
-
-	spin_unlock(&info->lock);
-}
-
-static void lf_copy_from(struct map_info *map, void *to,
-		unsigned long from, ssize_t len)
-{
-	struct latch_addr_flash_info *info =
-		(struct latch_addr_flash_info *) map->map_priv_1;
-	unsigned n;
-
-	while (len > 0) {
-		n = info->win_mask + 1 - (from & info->win_mask);
-		if (n > len)
-			n = len;
-
-		spin_lock(&info->lock);
-
-		info->set_window(from, info->data);
-		memcpy_fromio(to, map->virt + (from & info->win_mask), n);
-
-		spin_unlock(&info->lock);
-
-		to += n;
-		from += n;
-		len -= n;
-	}
-}
-
-static char *rom_probe_types[] = { "cfi_probe", NULL };
-
-static int latch_addr_flash_remove(struct platform_device *dev)
-{
-	struct latch_addr_flash_info *info;
-	struct latch_addr_flash_data *latch_addr_data;
-
-	info = platform_get_drvdata(dev);
-	if (info == NULL)
-		return 0;
-
-	latch_addr_data = dev_get_platdata(&dev->dev);
-
-	if (info->mtd != NULL) {
-		mtd_device_unregister(info->mtd);
-		map_destroy(info->mtd);
-	}
-
-	if (info->map.virt != NULL)
-		iounmap(info->map.virt);
-
-	if (info->res != NULL)
-		release_mem_region(info->res->start, resource_size(info->res));
-
-	kfree(info);
-
-	if (latch_addr_data->done)
-		latch_addr_data->done(latch_addr_data->data);
-
-	return 0;
-}
-
-static int latch_addr_flash_probe(struct platform_device *dev)
-{
-	struct latch_addr_flash_data *latch_addr_data;
-	struct latch_addr_flash_info *info;
-	resource_size_t win_base = dev->resource->start;
-	resource_size_t win_size = resource_size(dev->resource);
-	char **probe_type;
-	int chipsel;
-	int err;
-
-	latch_addr_data = dev_get_platdata(&dev->dev);
-	if (latch_addr_data == NULL)
-		return -ENODEV;
-
-	pr_notice("latch-addr platform flash device: %#llx byte "
-		  "window at %#.8llx\n",
-		  (unsigned long long)win_size, (unsigned long long)win_base);
-
-	chipsel = dev->id;
-
-	if (latch_addr_data->init) {
-		err = latch_addr_data->init(latch_addr_data->data, chipsel);
-		if (err != 0)
-			return err;
-	}
-
-	info = kzalloc(sizeof(struct latch_addr_flash_info), GFP_KERNEL);
-	if (info == NULL) {
-		err = -ENOMEM;
-		goto done;
-	}
-
-	platform_set_drvdata(dev, info);
-
-	info->res = request_mem_region(win_base, win_size, DRIVER_NAME);
-	if (info->res == NULL) {
-		dev_err(&dev->dev, "Could not reserve memory region\n");
-		err = -EBUSY;
-		goto free_info;
-	}
-
-	info->map.name		= DRIVER_NAME;
-	info->map.size		= latch_addr_data->size;
-	info->map.bankwidth	= latch_addr_data->width;
-
-	info->map.phys		= NO_XIP;
-	info->map.virt		= ioremap(win_base, win_size);
-	if (!info->map.virt) {
-		err = -ENOMEM;
-		goto free_res;
-	}
-
-	info->map.map_priv_1	= (unsigned long)info;
-
-	info->map.read		= lf_read;
-	info->map.copy_from	= lf_copy_from;
-	info->map.write		= lf_write;
-	info->set_window	= latch_addr_data->set_window;
-	info->data		= latch_addr_data->data;
-	info->win_mask		= win_size - 1;
-
-	spin_lock_init(&info->lock);
-
-	for (probe_type = rom_probe_types; !info->mtd && *probe_type;
-		probe_type++)
-		info->mtd = do_map_probe(*probe_type, &info->map);
-
-	if (info->mtd == NULL) {
-		dev_err(&dev->dev, "map_probe failed\n");
-		err = -ENODEV;
-		goto iounmap;
-	}
-	info->mtd->dev.parent = &dev->dev;
-
-	mtd_device_register(info->mtd, latch_addr_data->parts,
-			    latch_addr_data->nr_parts);
-	return 0;
-
-iounmap:
-	iounmap(info->map.virt);
-free_res:
-	release_mem_region(info->res->start, resource_size(info->res));
-free_info:
-	kfree(info);
-done:
-	if (latch_addr_data->done)
-		latch_addr_data->done(latch_addr_data->data);
-	return err;
-}
-
-static struct platform_driver latch_addr_flash_driver = {
-	.probe		= latch_addr_flash_probe,
-	.remove		= latch_addr_flash_remove,
-	.driver		= {
-		.name	= DRIVER_NAME,
-	},
-};
-
-module_platform_driver(latch_addr_flash_driver);
-
-MODULE_AUTHOR("David Griego <[e-mail]>");
-MODULE_DESCRIPTION("MTD map driver for flashes addressed physically with upper "
-		"address lines being set board specifically");
-MODULE_LICENSE("GPL v2");