172 lines
3.7 KiB
C
172 lines
3.7 KiB
C
/*
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*
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* sun_uflash - Driver implementation for user-programmable flash
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* present on many Sun Microsystems SME boardsets.
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*
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* This driver does NOT provide access to the OBP-flash for
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* safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.
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*
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* Copyright (c) 2001 Eric Brower (ebrower@usa.net)
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <asm/ebus.h>
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#include <asm/oplib.h>
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#include <asm/prom.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#define UFLASH_OBPNAME "flashprom"
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#define UFLASH_DEVNAME "userflash"
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#define UFLASH_WINDOW_SIZE 0x200000
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#define UFLASH_BUSWIDTH 1 /* EBus is 8-bit */
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MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
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MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");
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MODULE_SUPPORTED_DEVICE("userflash");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("2.0");
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static LIST_HEAD(device_list);
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struct uflash_dev {
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const char *name; /* device name */
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struct map_info map; /* mtd map info */
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struct mtd_info *mtd; /* mtd info */
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};
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struct map_info uflash_map_templ = {
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.name = "SUNW,???-????",
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.size = UFLASH_WINDOW_SIZE,
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.bankwidth = UFLASH_BUSWIDTH,
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};
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int uflash_devinit(struct linux_ebus_device *edev, struct device_node *dp)
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{
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struct uflash_dev *up;
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struct resource *res;
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res = &edev->resource[0];
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if (edev->num_addrs != 1) {
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/* Non-CFI userflash device-- once I find one we
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* can work on supporting it.
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*/
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printk("%s: unsupported device at 0x%llx (%d regs): " \
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"email ebrower@usa.net\n",
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dp->full_name, (unsigned long long)res->start,
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edev->num_addrs);
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return -ENODEV;
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}
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up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
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if (!up)
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return -ENOMEM;
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/* copy defaults and tweak parameters */
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memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));
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up->map.size = (res->end - res->start) + 1UL;
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up->name = of_get_property(dp, "model", NULL);
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if (up->name && 0 < strlen(up->name))
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up->map.name = (char *)up->name;
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up->map.phys = res->start;
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up->map.virt = ioremap_nocache(res->start, up->map.size);
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if (!up->map.virt) {
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printk("%s: Failed to map device.\n", dp->full_name);
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kfree(up);
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return -EINVAL;
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}
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simple_map_init(&up->map);
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/* MTD registration */
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up->mtd = do_map_probe("cfi_probe", &up->map);
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if (!up->mtd) {
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iounmap(up->map.virt);
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kfree(up);
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return -ENXIO;
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}
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up->mtd->owner = THIS_MODULE;
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add_mtd_device(up->mtd);
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dev_set_drvdata(&edev->ofdev.dev, up);
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return 0;
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}
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static int __devinit uflash_probe(struct of_device *dev, const struct of_device_id *match)
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{
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struct linux_ebus_device *edev = to_ebus_device(&dev->dev);
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struct device_node *dp = dev->node;
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if (of_find_property(dp, "user", NULL))
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return -ENODEV;
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return uflash_devinit(edev, dp);
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}
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static int __devexit uflash_remove(struct of_device *dev)
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{
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struct uflash_dev *up = dev_get_drvdata(&dev->dev);
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if (up->mtd) {
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del_mtd_device(up->mtd);
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map_destroy(up->mtd);
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}
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if (up->map.virt) {
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iounmap(up->map.virt);
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up->map.virt = NULL;
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}
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kfree(up);
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return 0;
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}
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static struct of_device_id uflash_match[] = {
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{
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.name = UFLASH_OBPNAME,
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, uflash_match);
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static struct of_platform_driver uflash_driver = {
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.name = UFLASH_DEVNAME,
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.match_table = uflash_match,
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.probe = uflash_probe,
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.remove = __devexit_p(uflash_remove),
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};
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static int __init uflash_init(void)
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{
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return of_register_driver(&uflash_driver, &ebus_bus_type);
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}
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static void __exit uflash_exit(void)
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{
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of_unregister_driver(&uflash_driver);
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}
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module_init(uflash_init);
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module_exit(uflash_exit);
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