1 // SPDX-License-Identifier: GPL-2.0-only
2 /* sun_uflash.c - Driver for user-programmable flash on
5  * This driver does NOT provide access to the OBP-flash for
6  * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.
31 #define UFLASH_BUSWIDTH		1			/* EBus is 8-bit */
34 MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");
46 	.name =		"SUNW,???-????",
53 	struct uflash_dev *up;  in uflash_devinit()  local
55 	if (op->resource[1].flags) {  in uflash_devinit()
56 		/* Non-CFI userflash device-- once I find one we  in uflash_devinit()
60 		       dp, (unsigned long long)op->resource[0].start);  in uflash_devinit()
62 		return -ENODEV;  in uflash_devinit()
65 	up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);  in uflash_devinit()
66 	if (!up) {  in uflash_devinit()
68 		return -ENOMEM;  in uflash_devinit()
72 	memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));  in uflash_devinit()
74 	up->map.size = resource_size(&op->resource[0]);  in uflash_devinit()
76 	up->name = of_get_property(dp, "model", NULL);  in uflash_devinit()
77 	if (up->name && 0 < strlen(up->name))  in uflash_devinit()
78 		up->map.name = up->name;  in uflash_devinit()
80 	up->map.phys = op->resource[0].start;  in uflash_devinit()
82 	up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size,  in uflash_devinit()
84 	if (!up->map.virt) {  in uflash_devinit()
86 		kfree(up);  in uflash_devinit()
88 		return -EINVAL;  in uflash_devinit()
91 	simple_map_init(&up->map);  in uflash_devinit()
94 	up->mtd = do_map_probe("cfi_probe", &up->map);  in uflash_devinit()
95 	if (!up->mtd) {  in uflash_devinit()
96 		of_iounmap(&op->resource[0], up->map.virt, up->map.size);  in uflash_devinit()
97 		kfree(up);  in uflash_devinit()
99 		return -ENXIO;  in uflash_devinit()
102 	up->mtd->owner = THIS_MODULE;  in uflash_devinit()
104 	mtd_device_register(up->mtd, NULL, 0);  in uflash_devinit()
106 	dev_set_drvdata(&op->dev, up);  in uflash_devinit()
113 	struct device_node *dp = op->dev.of_node;  in uflash_probe()
119 		return -ENODEV;  in uflash_probe()
126 	struct uflash_dev *up = dev_get_drvdata(&op->dev);  in uflash_remove()  local
128 	if (up->mtd) {  in uflash_remove()
129 		mtd_device_unregister(up->mtd);  in uflash_remove()
130 		map_destroy(up->mtd);  in uflash_remove()
132 	if (up->map.virt) {  in uflash_remove()
133 		of_iounmap(&op->resource[0], up->map.virt, up->map.size);  in uflash_remove()
134 		up->map.virt = NULL;  in uflash_remove()
137 	kfree(up);  in uflash_remove()