mtd: NOR flash driver for OMAP-L137/AM17x
OMAP-L137/AM17x has limited number of dedicated EMIFA address pins, enough to interface directly to an SDRAM. If a device such as an asynchronous flash needs to be attached to the EMIFA, then either GPIO pins or a chip select may be used to control the flash device's upper address lines. This patch adds support for the NOR flash on the OMAP-L137/ AM17x user interface daughter board using the latch-addr-flash MTD mapping driver which allows flashes to be partially physically addressed. The upper address lines are set by a board specific code which is a separate patch. Signed-off-by: David Griego <dgriego@mvista.com> Signed-off-by: Aleksey Makarov <amakarov@ru.mvista.com> Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Savinay Dharmappa <savinay.dharmappa@ti.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Griego
David Woodhouse
parent
a321590246
commit
dcfb81d61d
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@ -552,4 +552,13 @@ config MTD_PISMO
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When built as a module, it will be called pismo.ko
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config MTD_LATCH_ADDR
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tristate "Latch-assisted Flash Chip Support"
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depends on MTD_COMPLEX_MAPPINGS
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help
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Map driver which allows flashes to be partially physically addressed
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and have the upper address lines set by a board specific code.
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If compiled as a module, it will be called latch-addr-flash.
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endmenu
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@ -59,3 +59,4 @@ obj-$(CONFIG_MTD_RBTX4939) += rbtx4939-flash.o
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obj-$(CONFIG_MTD_VMU) += vmu-flash.o
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obj-$(CONFIG_MTD_GPIO_ADDR) += gpio-addr-flash.o
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obj-$(CONFIG_MTD_BCM963XX) += bcm963xx-flash.o
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obj-$(CONFIG_MTD_LATCH_ADDR) += latch-addr-flash.o
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@ -0,0 +1,272 @@
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/*
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* Interface for NOR flash driver whose high address lines are latched
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*
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* Copyright © 2000 Nicolas Pitre <nico@cam.org>
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* Copyright © 2005-2008 Analog Devices Inc.
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* Copyright © 2008 MontaVista Software, Inc. <source@mvista.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/latch-addr-flash.h>
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#include <linux/slab.h>
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#define DRIVER_NAME "latch-addr-flash"
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struct latch_addr_flash_info {
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struct mtd_info *mtd;
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struct map_info map;
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struct resource *res;
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void (*set_window)(unsigned long offset, void *data);
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void *data;
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/* cache; could be found out of res */
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unsigned long win_mask;
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int nr_parts;
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struct mtd_partition *parts;
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spinlock_t lock;
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};
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static map_word lf_read(struct map_info *map, unsigned long ofs)
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{
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struct latch_addr_flash_info *info;
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map_word datum;
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info = (struct latch_addr_flash_info *)map->map_priv_1;
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spin_lock(&info->lock);
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info->set_window(ofs, info->data);
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datum = inline_map_read(map, info->win_mask & ofs);
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spin_unlock(&info->lock);
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return datum;
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}
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static void lf_write(struct map_info *map, map_word datum, unsigned long ofs)
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{
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struct latch_addr_flash_info *info;
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info = (struct latch_addr_flash_info *)map->map_priv_1;
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spin_lock(&info->lock);
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info->set_window(ofs, info->data);
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inline_map_write(map, datum, info->win_mask & ofs);
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spin_unlock(&info->lock);
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}
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static void lf_copy_from(struct map_info *map, void *to,
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unsigned long from, ssize_t len)
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{
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struct latch_addr_flash_info *info =
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(struct latch_addr_flash_info *) map->map_priv_1;
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unsigned n;
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while (len > 0) {
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n = info->win_mask + 1 - (from & info->win_mask);
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if (n > len)
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n = len;
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spin_lock(&info->lock);
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info->set_window(from, info->data);
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memcpy_fromio(to, map->virt + (from & info->win_mask), n);
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spin_unlock(&info->lock);
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to += n;
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from += n;
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len -= n;
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}
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}
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static char *rom_probe_types[] = { "cfi_probe", NULL };
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static char *part_probe_types[] = { "cmdlinepart", NULL };
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static int latch_addr_flash_remove(struct platform_device *dev)
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{
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struct latch_addr_flash_info *info;
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struct latch_addr_flash_data *latch_addr_data;
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info = platform_get_drvdata(dev);
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if (info == NULL)
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return 0;
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platform_set_drvdata(dev, NULL);
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latch_addr_data = dev->dev.platform_data;
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if (info->mtd != NULL) {
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if (mtd_has_partitions()) {
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if (info->nr_parts) {
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del_mtd_partitions(info->mtd);
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kfree(info->parts);
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} else if (latch_addr_data->nr_parts) {
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del_mtd_partitions(info->mtd);
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} else {
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del_mtd_device(info->mtd);
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}
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} else {
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del_mtd_device(info->mtd);
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}
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map_destroy(info->mtd);
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}
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if (info->map.virt != NULL)
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iounmap(info->map.virt);
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if (info->res != NULL)
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release_mem_region(info->res->start, resource_size(info->res));
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kfree(info);
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if (latch_addr_data->done)
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latch_addr_data->done(latch_addr_data->data);
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return 0;
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}
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static int __devinit latch_addr_flash_probe(struct platform_device *dev)
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{
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struct latch_addr_flash_data *latch_addr_data;
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struct latch_addr_flash_info *info;
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resource_size_t win_base = dev->resource->start;
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resource_size_t win_size = resource_size(dev->resource);
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char **probe_type;
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int chipsel;
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int err;
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latch_addr_data = dev->dev.platform_data;
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if (latch_addr_data == NULL)
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return -ENODEV;
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pr_notice("latch-addr platform flash device: %#llx byte "
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"window at %#.8llx\n",
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(unsigned long long)win_size, (unsigned long long)win_base);
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chipsel = dev->id;
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if (latch_addr_data->init) {
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err = latch_addr_data->init(latch_addr_data->data, chipsel);
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if (err != 0)
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return err;
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}
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info = kzalloc(sizeof(struct latch_addr_flash_info), GFP_KERNEL);
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if (info == NULL) {
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err = -ENOMEM;
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goto done;
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}
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platform_set_drvdata(dev, info);
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info->res = request_mem_region(win_base, win_size, DRIVER_NAME);
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if (info->res == NULL) {
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dev_err(&dev->dev, "Could not reserve memory region\n");
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err = -EBUSY;
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goto free_info;
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}
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info->map.name = DRIVER_NAME;
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info->map.size = latch_addr_data->size;
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info->map.bankwidth = latch_addr_data->width;
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info->map.phys = NO_XIP;
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info->map.virt = ioremap(win_base, win_size);
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if (!info->map.virt) {
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err = -ENOMEM;
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goto free_res;
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}
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info->map.map_priv_1 = (unsigned long)info;
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info->map.read = lf_read;
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info->map.copy_from = lf_copy_from;
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info->map.write = lf_write;
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info->set_window = latch_addr_data->set_window;
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info->data = latch_addr_data->data;
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info->win_mask = win_size - 1;
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spin_lock_init(&info->lock);
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for (probe_type = rom_probe_types; !info->mtd && *probe_type;
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probe_type++)
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info->mtd = do_map_probe(*probe_type, &info->map);
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if (info->mtd == NULL) {
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dev_err(&dev->dev, "map_probe failed\n");
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err = -ENODEV;
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goto iounmap;
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}
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info->mtd->owner = THIS_MODULE;
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if (mtd_has_partitions()) {
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err = parse_mtd_partitions(info->mtd,
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(const char **)part_probe_types,
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&info->parts, 0);
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if (err > 0) {
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add_mtd_partitions(info->mtd, info->parts, err);
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return 0;
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}
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if (latch_addr_data->nr_parts) {
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pr_notice("Using latch-addr-flash partition information\n");
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add_mtd_partitions(info->mtd, latch_addr_data->parts,
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latch_addr_data->nr_parts);
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return 0;
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}
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}
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add_mtd_device(info->mtd);
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return 0;
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iounmap:
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iounmap(info->map.virt);
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free_res:
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release_mem_region(info->res->start, resource_size(info->res));
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free_info:
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kfree(info);
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done:
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if (latch_addr_data->done)
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latch_addr_data->done(latch_addr_data->data);
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return err;
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}
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static struct platform_driver latch_addr_flash_driver = {
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.probe = latch_addr_flash_probe,
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.remove = __devexit_p(latch_addr_flash_remove),
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.driver = {
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.name = DRIVER_NAME,
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},
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};
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static int __init latch_addr_flash_init(void)
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{
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return platform_driver_register(&latch_addr_flash_driver);
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}
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module_init(latch_addr_flash_init);
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static void __exit latch_addr_flash_exit(void)
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{
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platform_driver_unregister(&latch_addr_flash_driver);
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}
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module_exit(latch_addr_flash_exit);
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MODULE_AUTHOR("David Griego <dgriego@mvista.com>");
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MODULE_DESCRIPTION("MTD map driver for flashes addressed physically with upper "
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"address lines being set board specifically");
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MODULE_LICENSE("GPL v2");
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@ -0,0 +1,29 @@
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/*
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* Interface for NOR flash driver whose high address lines are latched
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*
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* Copyright © 2008 MontaVista Software, Inc. <source@mvista.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#ifndef __LATCH_ADDR_FLASH__
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#define __LATCH_ADDR_FLASH__
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struct map_info;
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struct mtd_partition;
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struct latch_addr_flash_data {
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unsigned int width;
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unsigned int size;
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int (*init)(void *data, int cs);
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void (*done)(void *data);
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void (*set_window)(unsigned long offset, void *data);
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void *data;
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unsigned int nr_parts;
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struct mtd_partition *parts;
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};
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#endif
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