281 lines
6.7 KiB
C
281 lines
6.7 KiB
C
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/*
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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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spinlock_t vpp_lock;
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int vpp_refcnt;
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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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physmap_data = dev_get_platdata(&dev->dev);
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if (info->cmtd) {
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mtd_device_unregister(info->cmtd);
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if (info->cmtd != info->mtd[0])
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mtd_concat_destroy(info->cmtd);
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}
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for (i = 0; i < MAX_RESOURCES; i++) {
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if (info->mtd[i] != NULL)
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map_destroy(info->mtd[i]);
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}
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if (physmap_data->exit)
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physmap_data->exit(dev);
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return 0;
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}
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static void physmap_set_vpp(struct map_info *map, int state)
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{
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struct platform_device *pdev;
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struct physmap_flash_data *physmap_data;
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struct physmap_flash_info *info;
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unsigned long flags;
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pdev = (struct platform_device *)map->map_priv_1;
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physmap_data = dev_get_platdata(&pdev->dev);
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if (!physmap_data->set_vpp)
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return;
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info = platform_get_drvdata(pdev);
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spin_lock_irqsave(&info->vpp_lock, flags);
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if (state) {
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if (++info->vpp_refcnt == 1) /* first nested 'on' */
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physmap_data->set_vpp(pdev, 1);
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} else {
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if (--info->vpp_refcnt == 0) /* last nested 'off' */
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physmap_data->set_vpp(pdev, 0);
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}
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spin_unlock_irqrestore(&info->vpp_lock, flags);
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}
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static const char * const rom_probe_types[] = {
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"cfi_probe", "jedec_probe", "qinfo_probe", "map_rom", NULL };
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static const char * const part_probe_types[] = {
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"cmdlinepart", "RedBoot", "afs", NULL };
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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 * const *probe_type;
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const char * const *part_types;
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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_get_platdata(&dev->dev);
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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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if (physmap_data->init) {
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err = physmap_data->init(dev);
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if (err)
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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)resource_size(&dev->resource[i]),
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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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resource_size(&dev->resource[i]),
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dev_name(&dev->dev))) {
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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_name(&dev->dev);
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info->map[i].phys = dev->resource[i].start;
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info->map[i].size = resource_size(&dev->resource[i]);
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info->map[i].bankwidth = physmap_data->width;
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info->map[i].set_vpp = physmap_set_vpp;
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info->map[i].pfow_base = physmap_data->pfow_base;
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info->map[i].map_priv_1 = (unsigned long)dev;
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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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if (physmap_data->probe_type == NULL) {
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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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} else
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info->mtd[i] = do_map_probe(physmap_data->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]->dev.parent = &dev->dev;
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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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info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
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if (info->cmtd == NULL)
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err = -ENXIO;
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}
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if (err)
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goto err_out;
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spin_lock_init(&info->vpp_lock);
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part_types = physmap_data->part_probe_types ? : part_probe_types;
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mtd_device_parse_register(info->cmtd, part_types, NULL,
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physmap_data->parts, physmap_data->nr_parts);
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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 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 (mtd_suspend(info->mtd[i]) == 0)
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mtd_resume(info->mtd[i]);
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}
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#else
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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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.shutdown = physmap_flash_shutdown,
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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_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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#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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err = platform_device_register(&physmap_flash);
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if (err)
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platform_driver_unregister(&physmap_flash_driver);
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}
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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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