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1// SPDX-License-Identifier: GPL-2.0-only2/* sun_uflash.c - Driver for user-programmable flash on3 * Sun Microsystems SME boardsets.4 *5 * This driver does NOT provide access to the OBP-flash for6 * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.7 *8 * Copyright (c) 2001 Eric Brower (ebrower@usa.net)9 */10 11#include <linux/kernel.h>12#include <linux/module.h>13#include <linux/fs.h>14#include <linux/errno.h>15#include <linux/ioport.h>16#include <linux/of.h>17#include <linux/platform_device.h>18#include <linux/slab.h>19#include <asm/prom.h>20#include <linux/uaccess.h>21#include <asm/io.h>22 23#include <linux/mtd/mtd.h>24#include <linux/mtd/map.h>25 26#define UFLASH_OBPNAME "flashprom"27#define DRIVER_NAME "sun_uflash"28#define PFX DRIVER_NAME ": "29 30#define UFLASH_WINDOW_SIZE 0x20000031#define UFLASH_BUSWIDTH 1 /* EBus is 8-bit */32 33MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");34MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");35MODULE_LICENSE("GPL");36MODULE_VERSION("2.1");37 38struct uflash_dev {39 const char *name; /* device name */40 struct map_info map; /* mtd map info */41 struct mtd_info *mtd; /* mtd info */42};43 44struct map_info uflash_map_templ = {45 .name = "SUNW,???-????",46 .size = UFLASH_WINDOW_SIZE,47 .bankwidth = UFLASH_BUSWIDTH,48};49 50static int uflash_devinit(struct platform_device *op, struct device_node *dp)51{52 struct uflash_dev *up;53 54 if (op->resource[1].flags) {55 /* Non-CFI userflash device-- once I find one we56 * can work on supporting it.57 */58 printk(KERN_ERR PFX "Unsupported device at %pOF, 0x%llx\n",59 dp, (unsigned long long)op->resource[0].start);60 61 return -ENODEV;62 }63 64 up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);65 if (!up)66 return -ENOMEM;67 68 /* copy defaults and tweak parameters */69 memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));70 71 up->map.size = resource_size(&op->resource[0]);72 73 up->name = of_get_property(dp, "model", NULL);74 if (up->name && 0 < strlen(up->name))75 up->map.name = up->name;76 77 up->map.phys = op->resource[0].start;78 79 up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size,80 DRIVER_NAME);81 if (!up->map.virt) {82 printk(KERN_ERR PFX "Failed to map device.\n");83 kfree(up);84 85 return -EINVAL;86 }87 88 simple_map_init(&up->map);89 90 /* MTD registration */91 up->mtd = do_map_probe("cfi_probe", &up->map);92 if (!up->mtd) {93 of_iounmap(&op->resource[0], up->map.virt, up->map.size);94 kfree(up);95 96 return -ENXIO;97 }98 99 up->mtd->owner = THIS_MODULE;100 101 mtd_device_register(up->mtd, NULL, 0);102 103 dev_set_drvdata(&op->dev, up);104 105 return 0;106}107 108static int uflash_probe(struct platform_device *op)109{110 struct device_node *dp = op->dev.of_node;111 112 /* Flashprom must have the "user" property in order to113 * be used by this driver.114 */115 if (!of_property_read_bool(dp, "user"))116 return -ENODEV;117 118 return uflash_devinit(op, dp);119}120 121static void uflash_remove(struct platform_device *op)122{123 struct uflash_dev *up = dev_get_drvdata(&op->dev);124 125 if (up->mtd) {126 mtd_device_unregister(up->mtd);127 map_destroy(up->mtd);128 }129 if (up->map.virt) {130 of_iounmap(&op->resource[0], up->map.virt, up->map.size);131 up->map.virt = NULL;132 }133 134 kfree(up);135}136 137static const struct of_device_id uflash_match[] = {138 {139 .name = UFLASH_OBPNAME,140 },141 {},142};143 144MODULE_DEVICE_TABLE(of, uflash_match);145 146static struct platform_driver uflash_driver = {147 .driver = {148 .name = DRIVER_NAME,149 .of_match_table = uflash_match,150 },151 .probe = uflash_probe,152 .remove_new = uflash_remove,153};154 155module_platform_driver(uflash_driver);156