diff options
Diffstat (limited to 'drivers/mtd/maps/sun_uflash.c')
| -rw-r--r-- | drivers/mtd/maps/sun_uflash.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/mtd/maps/sun_uflash.c b/drivers/mtd/maps/sun_uflash.c new file mode 100644 index 000000000..eb7258293 --- /dev/null +++ b/drivers/mtd/maps/sun_uflash.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* sun_uflash.c - Driver for user-programmable flash on + * Sun Microsystems SME boardsets. + * + * This driver does NOT provide access to the OBP-flash for + * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead. + * + * Copyright (c) 2001 Eric Brower (ebrower@usa.net) + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/slab.h> +#include <asm/prom.h> +#include <linux/uaccess.h> +#include <asm/io.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> + +#define UFLASH_OBPNAME "flashprom" +#define DRIVER_NAME "sun_uflash" +#define PFX DRIVER_NAME ": " + +#define UFLASH_WINDOW_SIZE 0x200000 +#define UFLASH_BUSWIDTH 1 /* EBus is 8-bit */ + +MODULE_AUTHOR("Eric Brower <ebrower@usa.net>"); +MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets"); +MODULE_SUPPORTED_DEVICE(DRIVER_NAME); +MODULE_LICENSE("GPL"); +MODULE_VERSION("2.1"); + +struct uflash_dev { + const char *name; /* device name */ + struct map_info map; /* mtd map info */ + struct mtd_info *mtd; /* mtd info */ +}; + +struct map_info uflash_map_templ = { + .name = "SUNW,???-????", + .size = UFLASH_WINDOW_SIZE, + .bankwidth = UFLASH_BUSWIDTH, +}; + +int uflash_devinit(struct platform_device *op, struct device_node *dp) +{ + struct uflash_dev *up; + + if (op->resource[1].flags) { + /* Non-CFI userflash device-- once I find one we + * can work on supporting it. + */ + printk(KERN_ERR PFX "Unsupported device at %pOF, 0x%llx\n", + dp, (unsigned long long)op->resource[0].start); + + return -ENODEV; + } + + up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL); + if (!up) { + printk(KERN_ERR PFX "Cannot allocate struct uflash_dev\n"); + return -ENOMEM; + } + + /* copy defaults and tweak parameters */ + memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ)); + + up->map.size = resource_size(&op->resource[0]); + + up->name = of_get_property(dp, "model", NULL); + if (up->name && 0 < strlen(up->name)) + up->map.name = up->name; + + up->map.phys = op->resource[0].start; + + up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size, + DRIVER_NAME); + if (!up->map.virt) { + printk(KERN_ERR PFX "Failed to map device.\n"); + kfree(up); + + return -EINVAL; + } + + simple_map_init(&up->map); + + /* MTD registration */ + up->mtd = do_map_probe("cfi_probe", &up->map); + if (!up->mtd) { + of_iounmap(&op->resource[0], up->map.virt, up->map.size); + kfree(up); + + return -ENXIO; + } + + up->mtd->owner = THIS_MODULE; + + mtd_device_register(up->mtd, NULL, 0); + + dev_set_drvdata(&op->dev, up); + + return 0; +} + +static int uflash_probe(struct platform_device *op) +{ + struct device_node *dp = op->dev.of_node; + + /* Flashprom must have the "user" property in order to + * be used by this driver. + */ + if (!of_find_property(dp, "user", NULL)) + return -ENODEV; + + return uflash_devinit(op, dp); +} + +static int uflash_remove(struct platform_device *op) +{ + struct uflash_dev *up = dev_get_drvdata(&op->dev); + + if (up->mtd) { + mtd_device_unregister(up->mtd); + map_destroy(up->mtd); + } + if (up->map.virt) { + of_iounmap(&op->resource[0], up->map.virt, up->map.size); + up->map.virt = NULL; + } + + kfree(up); + + return 0; +} + +static const struct of_device_id uflash_match[] = { + { + .name = UFLASH_OBPNAME, + }, + {}, +}; + +MODULE_DEVICE_TABLE(of, uflash_match); + +static struct platform_driver uflash_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = uflash_match, + }, + .probe = uflash_probe, + .remove = uflash_remove, +}; + +module_platform_driver(uflash_driver); |