186 lines
4.2 KiB
C
186 lines
4.2 KiB
C
/*
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* rbtx4939-flash (based on physmap.c)
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*
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* This is a simplified physmap driver with map_init callback function.
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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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* Copyright (C) 2009 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
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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 <asm/txx9/rbtx4939.h>
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struct rbtx4939_flash_info {
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struct mtd_info *mtd;
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struct map_info map;
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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 rbtx4939_flash_remove(struct platform_device *dev)
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{
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struct rbtx4939_flash_info *info;
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info = platform_get_drvdata(dev);
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if (!info)
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return 0;
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platform_set_drvdata(dev, NULL);
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if (info->mtd) {
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#ifdef CONFIG_MTD_PARTITIONS
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struct rbtx4939_flash_data *pdata = dev->dev.platform_data;
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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 (pdata->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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#else
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del_mtd_device(info->mtd);
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#endif
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map_destroy(info->mtd);
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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", NULL };
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#ifdef CONFIG_MTD_PARTITIONS
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static const char *part_probe_types[] = { "cmdlinepart", NULL };
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#endif
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static int rbtx4939_flash_probe(struct platform_device *dev)
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{
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struct rbtx4939_flash_data *pdata;
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struct rbtx4939_flash_info *info;
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struct resource *res;
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const char **probe_type;
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int err = 0;
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unsigned long size;
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pdata = dev->dev.platform_data;
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if (!pdata)
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return -ENODEV;
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res = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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platform_set_drvdata(dev, info);
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size = resource_size(res);
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pr_notice("rbtx4939 platform flash device: %pR\n", res);
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if (!devm_request_mem_region(&dev->dev, res->start, size,
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dev_name(&dev->dev)))
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return -EBUSY;
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info->map.name = dev_name(&dev->dev);
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info->map.phys = res->start;
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info->map.size = size;
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info->map.bankwidth = pdata->width;
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info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
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if (!info->map.virt)
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return -EBUSY;
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if (pdata->map_init)
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(*pdata->map_init)(&info->map);
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else
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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 && *probe_type; probe_type++)
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info->mtd = do_map_probe(*probe_type, &info->map);
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if (!info->mtd) {
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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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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->mtd, 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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info->nr_parts = err;
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return 0;
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}
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if (pdata->nr_parts) {
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pr_notice("Using rbtx4939 partition information\n");
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add_mtd_partitions(info->mtd, pdata->parts, pdata->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->mtd);
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return 0;
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err_out:
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rbtx4939_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 void rbtx4939_flash_shutdown(struct platform_device *dev)
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{
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struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
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if (info->mtd->suspend && info->mtd->resume)
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if (info->mtd->suspend(info->mtd) == 0)
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info->mtd->resume(info->mtd);
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}
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#else
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#define rbtx4939_flash_shutdown NULL
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#endif
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static struct platform_driver rbtx4939_flash_driver = {
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.probe = rbtx4939_flash_probe,
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.remove = rbtx4939_flash_remove,
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.shutdown = rbtx4939_flash_shutdown,
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.driver = {
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.name = "rbtx4939-flash",
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.owner = THIS_MODULE,
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},
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};
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static int __init rbtx4939_flash_init(void)
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{
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return platform_driver_register(&rbtx4939_flash_driver);
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}
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static void __exit rbtx4939_flash_exit(void)
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{
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platform_driver_unregister(&rbtx4939_flash_driver);
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}
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module_init(rbtx4939_flash_init);
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module_exit(rbtx4939_flash_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("RBTX4939 MTD map driver");
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MODULE_ALIAS("platform:rbtx4939-flash");
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