158 lines
3.4 KiB
C
158 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* sun_uflash.c - Driver for user-programmable flash on
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* 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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#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/ioport.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/slab.h>
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#include <asm/prom.h>
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#include <linux/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 DRIVER_NAME "sun_uflash"
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#define PFX DRIVER_NAME ": "
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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_LICENSE("GPL");
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MODULE_VERSION("2.1");
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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 platform_device *op, struct device_node *dp)
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{
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struct uflash_dev *up;
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if (op->resource[1].flags) {
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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(KERN_ERR PFX "Unsupported device at %pOF, 0x%llx\n",
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dp, (unsigned long long)op->resource[0].start);
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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 = resource_size(&op->resource[0]);
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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 = up->name;
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up->map.phys = op->resource[0].start;
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up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size,
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DRIVER_NAME);
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if (!up->map.virt) {
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printk(KERN_ERR PFX "Failed to map device.\n");
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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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of_iounmap(&op->resource[0], up->map.virt, up->map.size);
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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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mtd_device_register(up->mtd, NULL, 0);
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dev_set_drvdata(&op->dev, up);
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return 0;
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}
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static int uflash_probe(struct platform_device *op)
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{
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struct device_node *dp = op->dev.of_node;
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/* Flashprom must have the "user" property in order to
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* be used by this driver.
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*/
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if (!of_find_property(dp, "user", NULL))
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return -ENODEV;
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return uflash_devinit(op, dp);
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}
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static int uflash_remove(struct platform_device *op)
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{
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struct uflash_dev *up = dev_get_drvdata(&op->dev);
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if (up->mtd) {
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mtd_device_unregister(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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of_iounmap(&op->resource[0], up->map.virt, up->map.size);
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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 const 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 platform_driver uflash_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = uflash_match,
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},
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.probe = uflash_probe,
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.remove = uflash_remove,
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};
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module_platform_driver(uflash_driver);
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