[MTD] Convert physmap to platform driver
After dwmw2 let me know it ought to be done, I rewrote the physmap map driver to be a platform driver. I know zilch about the driver model, so I probably botched it in some way, but I've done some tests on an ixp23xx board which uses physmap, and it all seems to work. In order to not break existing physmap users, I've added some compat code that will instantiate a platform device iff CONFIG_MTD_PHYSMAP_LEN is defined and != 0. Also, I've changed the default value for CONFIG_MTD_PHYSMAP_LEN to zero, so that people who inadvertently compile in physmap (or new, platform-style, users of physmap) don't get burned. This works pretty well -- the new physmap driver is a drop-in replacement for the old one, and works on said ixp23xx board without any code changes needed. (This should hold as long as users don't touch 'physmap_map' directly.) Once all physmap users have been converted to instantiate their own platform devices, the compat code can go. (Or we decide that we can change all the in-tree users at the same time, and never merge the compat code.) Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Lennert Buytenhek
David Woodhouse
Родитель
422138dd68
Коммит
73566edf9b
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@ -37,7 +37,7 @@ config MTD_PHYSMAP_START
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config MTD_PHYSMAP_LEN
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hex "Physical length of flash mapping"
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depends on MTD_PHYSMAP
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default "0x4000000"
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default "0"
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help
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This is the total length of the mapping of the flash chips on
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your particular board. If there is space, or aliases, in the
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@ -14,113 +14,231 @@
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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 <asm/io.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/config.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/physmap.h>
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#include <asm/io.h>
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#include <asm/mach/flash.h>
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static struct mtd_info *mymtd;
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struct map_info physmap_map = {
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.name = "phys_mapped_flash",
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.phys = CONFIG_MTD_PHYSMAP_START,
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.size = CONFIG_MTD_PHYSMAP_LEN,
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.bankwidth = CONFIG_MTD_PHYSMAP_BANKWIDTH,
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struct physmap_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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#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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#ifdef CONFIG_MTD_PARTITIONS
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static struct mtd_partition *mtd_parts;
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static int mtd_parts_nb;
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static int num_physmap_partitions;
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static struct mtd_partition *physmap_partitions;
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static const char *part_probes[] __initdata = {"cmdlinepart", "RedBoot", NULL};
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void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
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static int physmap_flash_remove(struct platform_device *dev)
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{
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physmap_partitions=parts;
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num_physmap_partitions=num_parts;
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}
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#endif /* CONFIG_MTD_PARTITIONS */
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struct physmap_flash_info *info;
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struct physmap_flash_data *physmap_data;
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static int __init init_physmap(void)
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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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const char **type;
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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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printk(KERN_NOTICE "physmap flash device: %lx at %lx\n", physmap_map.size, physmap_map.phys);
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physmap_map.virt = ioremap(physmap_map.phys, physmap_map.size);
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if (!physmap_map.virt) {
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printk("Failed to ioremap\n");
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return -EIO;
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}
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simple_map_init(&physmap_map);
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mymtd = NULL;
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type = rom_probe_types;
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for(; !mymtd && *type; type++) {
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mymtd = do_map_probe(*type, &physmap_map);
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}
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if (mymtd) {
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mymtd->owner = THIS_MODULE;
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physmap_data = dev->dev.platform_data;
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if (info->mtd != NULL) {
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#ifdef CONFIG_MTD_PARTITIONS
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mtd_parts_nb = parse_mtd_partitions(mymtd, part_probes,
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&mtd_parts, 0);
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if (mtd_parts_nb > 0)
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{
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add_mtd_partitions (mymtd, mtd_parts, mtd_parts_nb);
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return 0;
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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 (physmap_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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if (num_physmap_partitions != 0)
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{
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printk(KERN_NOTICE
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"Using physmap partition definition\n");
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add_mtd_partitions (mymtd, physmap_partitions, num_physmap_partitions);
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return 0;
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}
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#else
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del_mtd_device(info->mtd);
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#endif
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add_mtd_device(mymtd);
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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((void *)info->map.virt);
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if (info->res != NULL) {
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release_resource(info->res);
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kfree(info->res);
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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;
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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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printk(KERN_NOTICE "physmap platform flash device: %.8lx at %.8lx\n",
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dev->resource->end - dev->resource->start + 1,
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dev->resource->start);
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info = kmalloc(sizeof(struct physmap_flash_info), 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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memset(info, 0, sizeof(*info));
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platform_set_drvdata(dev, info);
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info->res = request_mem_region(dev->resource->start,
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dev->resource->end - dev->resource->start + 1,
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dev->dev.bus_id);
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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 = -ENOMEM;
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goto err_out;
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}
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info->map.name = dev->dev.bus_id;
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info->map.phys = dev->resource->start;
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info->map.size = dev->resource->end - dev->resource->start + 1;
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info->map.bankwidth = physmap_data->width;
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info->map.set_vpp = physmap_data->set_vpp;
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info->map.virt = ioremap(info->map.phys, info->map.size);
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if (info->map.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);
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probe_type = rom_probe_types;
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for (; info->mtd == NULL && *probe_type != NULL; 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 = -ENXIO;
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goto err_out;
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}
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info->mtd->owner = THIS_MODULE;
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#ifdef CONFIG_MTD_PARTITIONS
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err = parse_mtd_partitions(info->mtd, part_probe_types, &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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iounmap(physmap_map.virt);
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return -ENXIO;
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}
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static void __exit cleanup_physmap(void)
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{
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#ifdef CONFIG_MTD_PARTITIONS
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if (mtd_parts_nb) {
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del_mtd_partitions(mymtd);
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kfree(mtd_parts);
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} else if (num_physmap_partitions) {
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del_mtd_partitions(mymtd);
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} else {
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del_mtd_device(mymtd);
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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->mtd, 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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#else
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del_mtd_device(mymtd);
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#endif
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map_destroy(mymtd);
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iounmap(physmap_map.virt);
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physmap_map.virt = NULL;
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add_mtd_device(info->mtd);
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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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module_init(init_physmap);
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module_exit(cleanup_physmap);
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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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.driver = {
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.name = "physmap-flash",
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},
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};
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#ifdef CONFIG_MTD_PHYSMAP_LEN
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#if CONFIG_MTD_PHYSMAP_LEN != 0
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#warning using PHYSMAP compat code
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#define PHYSMAP_COMPAT
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#endif
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#endif
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#ifdef 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,
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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 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 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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@ -24,22 +24,18 @@
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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/*
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* The map_info for physmap. Board can override size, buswidth, phys,
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* (*set_vpp)(), etc in their initial setup routine.
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*/
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extern struct map_info physmap_map;
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struct physmap_flash_data {
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unsigned int width;
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void (*set_vpp)(struct map_info *, int);
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unsigned int nr_parts;
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struct mtd_partition *parts;
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};
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/*
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* Board needs to specify the exact mapping during their setup time.
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*/
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static inline void physmap_configure(unsigned long addr, unsigned long size, int bankwidth, void (*set_vpp)(struct map_info *, int) )
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{
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physmap_map.phys = addr;
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physmap_map.size = size;
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physmap_map.bankwidth = bankwidth;
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physmap_map.set_vpp = set_vpp;
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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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#if defined(CONFIG_MTD_PARTITIONS)
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@ -58,4 +54,3 @@ void physmap_set_partitions(struct mtd_partition *parts, int num_parts);
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#endif /* defined(CONFIG_MTD) */
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#endif /* __LINUX_MTD_PHYSMAP__ */
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