dcb3e137ce
The current method for always showing physmap compat address, size, and width is a bit confusing. If length is set to 0, then the address and width are still shown but silently unused. The physmap code itself already has logic which sets compat based on length, so just pull that out and into the Kconfig to make everything clear. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Cc: Bryan Wu <Bryan.Wu@analog.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
326 lines
7.8 KiB
C
326 lines
7.8 KiB
C
/*
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* Normal mappings of chips in physical memory
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*
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* Copyright (C) 2003 MontaVista Software Inc.
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* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
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*
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* 031022 - [jsun] add run-time configure and partition setup
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/platform_device.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/mtd/physmap.h>
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#include <linux/mtd/concat.h>
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#include <linux/io.h>
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#define MAX_RESOURCES 4
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struct physmap_flash_info {
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struct mtd_info *mtd[MAX_RESOURCES];
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struct mtd_info *cmtd;
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struct map_info map[MAX_RESOURCES];
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#ifdef CONFIG_MTD_PARTITIONS
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int nr_parts;
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struct mtd_partition *parts;
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#endif
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};
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static int physmap_flash_remove(struct platform_device *dev)
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{
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struct physmap_flash_info *info;
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struct physmap_flash_data *physmap_data;
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int i;
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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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physmap_data = dev->dev.platform_data;
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#ifdef CONFIG_MTD_CONCAT
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if (info->cmtd != info->mtd[0]) {
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del_mtd_device(info->cmtd);
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mtd_concat_destroy(info->cmtd);
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}
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#endif
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for (i = 0; i < MAX_RESOURCES; i++) {
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if (info->mtd[i] != NULL) {
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#ifdef CONFIG_MTD_PARTITIONS
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if (info->nr_parts) {
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del_mtd_partitions(info->mtd[i]);
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kfree(info->parts);
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} else if (physmap_data->nr_parts) {
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del_mtd_partitions(info->mtd[i]);
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} else {
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del_mtd_device(info->mtd[i]);
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}
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#else
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del_mtd_device(info->mtd[i]);
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#endif
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map_destroy(info->mtd[i]);
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}
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}
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return 0;
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}
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static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
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#ifdef CONFIG_MTD_PARTITIONS
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static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
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#endif
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static int physmap_flash_probe(struct platform_device *dev)
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{
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struct physmap_flash_data *physmap_data;
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struct physmap_flash_info *info;
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const char **probe_type;
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int err = 0;
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int i;
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int devices_found = 0;
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physmap_data = dev->dev.platform_data;
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if (physmap_data == NULL)
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return -ENODEV;
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info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
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GFP_KERNEL);
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if (info == NULL) {
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err = -ENOMEM;
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goto err_out;
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}
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platform_set_drvdata(dev, info);
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for (i = 0; i < dev->num_resources; i++) {
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printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
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(unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
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(unsigned long long)dev->resource[i].start);
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if (!devm_request_mem_region(&dev->dev,
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dev->resource[i].start,
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dev->resource[i].end - dev->resource[i].start + 1,
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dev->dev.bus_id)) {
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dev_err(&dev->dev, "Could not reserve memory region\n");
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err = -ENOMEM;
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goto err_out;
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}
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info->map[i].name = dev->dev.bus_id;
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info->map[i].phys = dev->resource[i].start;
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info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
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info->map[i].bankwidth = physmap_data->width;
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info->map[i].set_vpp = physmap_data->set_vpp;
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info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
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info->map[i].size);
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if (info->map[i].virt == NULL) {
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dev_err(&dev->dev, "Failed to ioremap flash region\n");
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err = EIO;
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goto err_out;
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}
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simple_map_init(&info->map[i]);
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probe_type = rom_probe_types;
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for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
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info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
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if (info->mtd[i] == NULL) {
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dev_err(&dev->dev, "map_probe failed\n");
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err = -ENXIO;
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goto err_out;
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} else {
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devices_found++;
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}
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info->mtd[i]->owner = THIS_MODULE;
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}
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if (devices_found == 1) {
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info->cmtd = info->mtd[0];
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} else if (devices_found > 1) {
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/*
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* We detected multiple devices. Concatenate them together.
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*/
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#ifdef CONFIG_MTD_CONCAT
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info->cmtd = mtd_concat_create(info->mtd, devices_found, dev->dev.bus_id);
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if (info->cmtd == NULL)
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err = -ENXIO;
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#else
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printk(KERN_ERR "physmap-flash: multiple devices "
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"found but MTD concat support disabled.\n");
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err = -ENXIO;
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#endif
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}
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if (err)
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goto err_out;
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#ifdef CONFIG_MTD_PARTITIONS
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err = parse_mtd_partitions(info->cmtd, part_probe_types, &info->parts, 0);
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if (err > 0) {
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add_mtd_partitions(info->cmtd, info->parts, err);
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return 0;
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}
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if (physmap_data->nr_parts) {
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printk(KERN_NOTICE "Using physmap partition information\n");
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add_mtd_partitions(info->cmtd, physmap_data->parts,
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physmap_data->nr_parts);
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return 0;
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}
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#endif
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add_mtd_device(info->cmtd);
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return 0;
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err_out:
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physmap_flash_remove(dev);
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return err;
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}
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#ifdef CONFIG_PM
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static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
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{
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struct physmap_flash_info *info = platform_get_drvdata(dev);
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int ret = 0;
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int i;
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for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
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if (info->mtd[i]->suspend) {
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ret = info->mtd[i]->suspend(info->mtd[i]);
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if (ret)
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goto fail;
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}
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return 0;
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fail:
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for (--i; i >= 0; --i)
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if (info->mtd[i]->suspend) {
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BUG_ON(!info->mtd[i]->resume);
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info->mtd[i]->resume(info->mtd[i]);
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}
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return ret;
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}
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static int physmap_flash_resume(struct platform_device *dev)
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{
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struct physmap_flash_info *info = platform_get_drvdata(dev);
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int i;
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for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
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if (info->mtd[i]->resume)
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info->mtd[i]->resume(info->mtd[i]);
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return 0;
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}
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static void physmap_flash_shutdown(struct platform_device *dev)
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{
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struct physmap_flash_info *info = platform_get_drvdata(dev);
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int i;
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for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
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if (info->mtd[i]->suspend && info->mtd[i]->resume)
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if (info->mtd[i]->suspend(info->mtd[i]) == 0)
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info->mtd[i]->resume(info->mtd[i]);
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}
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#else
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#define physmap_flash_suspend NULL
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#define physmap_flash_resume NULL
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#define physmap_flash_shutdown NULL
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#endif
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static struct platform_driver physmap_flash_driver = {
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.probe = physmap_flash_probe,
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.remove = physmap_flash_remove,
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.suspend = physmap_flash_suspend,
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.resume = physmap_flash_resume,
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.shutdown = physmap_flash_shutdown,
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.driver = {
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.name = "physmap-flash",
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.owner = THIS_MODULE,
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},
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};
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#ifdef CONFIG_MTD_PHYSMAP_COMPAT
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static struct physmap_flash_data physmap_flash_data = {
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.width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
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};
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static struct resource physmap_flash_resource = {
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.start = CONFIG_MTD_PHYSMAP_START,
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.end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
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.flags = IORESOURCE_MEM,
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};
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static struct platform_device physmap_flash = {
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.name = "physmap-flash",
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.id = 0,
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.dev = {
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.platform_data = &physmap_flash_data,
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},
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.num_resources = 1,
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.resource = &physmap_flash_resource,
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};
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void physmap_configure(unsigned long addr, unsigned long size,
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int bankwidth, void (*set_vpp)(struct map_info *, int))
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{
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physmap_flash_resource.start = addr;
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physmap_flash_resource.end = addr + size - 1;
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physmap_flash_data.width = bankwidth;
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physmap_flash_data.set_vpp = set_vpp;
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}
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#ifdef CONFIG_MTD_PARTITIONS
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void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
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{
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physmap_flash_data.nr_parts = num_parts;
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physmap_flash_data.parts = parts;
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}
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#endif
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#endif
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static int __init physmap_init(void)
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{
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int err;
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err = platform_driver_register(&physmap_flash_driver);
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#ifdef CONFIG_MTD_PHYSMAP_COMPAT
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if (err == 0)
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platform_device_register(&physmap_flash);
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#endif
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return err;
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}
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static void __exit physmap_exit(void)
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{
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#ifdef CONFIG_MTD_PHYSMAP_COMPAT
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platform_device_unregister(&physmap_flash);
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#endif
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platform_driver_unregister(&physmap_flash_driver);
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}
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module_init(physmap_init);
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module_exit(physmap_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
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MODULE_DESCRIPTION("Generic configurable MTD map driver");
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/* legacy platform drivers can't hotplug or coldplg */
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#ifndef CONFIG_MTD_PHYSMAP_COMPAT
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/* work with hotplug and coldplug */
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MODULE_ALIAS("platform:physmap-flash");
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#endif
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