diff options
Diffstat (limited to 'drivers/mtd/maps/sun_uflash.c')
| -rw-r--r-- | drivers/mtd/maps/sun_uflash.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/mtd/maps/sun_uflash.c b/drivers/mtd/maps/sun_uflash.c new file mode 100644 index 0000000..29091d1 --- /dev/null +++ b/drivers/mtd/maps/sun_uflash.c @@ -0,0 +1,177 @@ +/* $Id: sun_uflash.c,v 1.11 2004/11/04 13:24:15 gleixner Exp $ + * + * sun_uflash - Driver implementation for user-programmable flash + * present on many 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/init.h> +#include <linux/ioport.h> +#include <asm/ebus.h> +#include <asm/oplib.h> +#include <asm/uaccess.h> +#include <asm/io.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> + +#define UFLASH_OBPNAME "flashprom" +#define UFLASH_DEVNAME "userflash" + +#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 + ("userflash"); +MODULE_LICENSE + ("GPL"); + +static LIST_HEAD(device_list); +struct uflash_dev { + char * name; /* device name */ + struct map_info map; /* mtd map info */ + struct mtd_info * mtd; /* mtd info */ + struct list_head list; +}; + + +struct map_info uflash_map_templ = { + .name = "SUNW,???-????", + .size = UFLASH_WINDOW_SIZE, + .bankwidth = UFLASH_BUSWIDTH, +}; + +int uflash_devinit(struct linux_ebus_device* edev) +{ + int iTmp, nregs; + struct linux_prom_registers regs[2]; + struct uflash_dev *pdev; + + iTmp = prom_getproperty( + edev->prom_node, "reg", (void *)regs, sizeof(regs)); + if ((iTmp % sizeof(regs[0])) != 0) { + printk("%s: Strange reg property size %d\n", + UFLASH_DEVNAME, iTmp); + return -ENODEV; + } + + nregs = iTmp / sizeof(regs[0]); + + if (nregs != 1) { + /* Non-CFI userflash device-- once I find one we + * can work on supporting it. + */ + printk("%s: unsupported device at 0x%lx (%d regs): " \ + "email ebrower@usa.net\n", + UFLASH_DEVNAME, edev->resource[0].start, nregs); + return -ENODEV; + } + + if(0 == (pdev = kmalloc(sizeof(struct uflash_dev), GFP_KERNEL))) { + printk("%s: unable to kmalloc new device\n", UFLASH_DEVNAME); + return(-ENOMEM); + } + + /* copy defaults and tweak parameters */ + memcpy(&pdev->map, &uflash_map_templ, sizeof(uflash_map_templ)); + pdev->map.size = regs[0].reg_size; + + iTmp = prom_getproplen(edev->prom_node, "model"); + pdev->name = kmalloc(iTmp, GFP_KERNEL); + prom_getstring(edev->prom_node, "model", pdev->name, iTmp); + if(0 != pdev->name && 0 < strlen(pdev->name)) { + pdev->map.name = pdev->name; + } + pdev->map.phys = edev->resource[0].start; + pdev->map.virt = ioremap_nocache(edev->resource[0].start, pdev->map.size); + if(0 == pdev->map.virt) { + printk("%s: failed to map device\n", __FUNCTION__); + kfree(pdev->name); + kfree(pdev); + return(-1); + } + + simple_map_init(&pdev->map); + + /* MTD registration */ + pdev->mtd = do_map_probe("cfi_probe", &pdev->map); + if(0 == pdev->mtd) { + iounmap(pdev->map.virt); + kfree(pdev->name); + kfree(pdev); + return(-ENXIO); + } + + list_add(&pdev->list, &device_list); + + pdev->mtd->owner = THIS_MODULE; + + add_mtd_device(pdev->mtd); + return(0); +} + +static int __init uflash_init(void) +{ + struct linux_ebus *ebus = NULL; + struct linux_ebus_device *edev = NULL; + + for_each_ebus(ebus) { + for_each_ebusdev(edev, ebus) { + if (!strcmp(edev->prom_name, UFLASH_OBPNAME)) { + if(0 > prom_getproplen(edev->prom_node, "user")) { + DEBUG(2, "%s: ignoring device at 0x%lx\n", + UFLASH_DEVNAME, edev->resource[0].start); + } else { + uflash_devinit(edev); + } + } + } + } + + if(list_empty(&device_list)) { + printk("%s: unable to locate device\n", UFLASH_DEVNAME); + return -ENODEV; + } + return(0); +} + +static void __exit uflash_cleanup(void) +{ + struct list_head *udevlist; + struct uflash_dev *udev; + + list_for_each(udevlist, &device_list) { + udev = list_entry(udevlist, struct uflash_dev, list); + DEBUG(2, "%s: removing device %s\n", + UFLASH_DEVNAME, udev->name); + + if(0 != udev->mtd) { + del_mtd_device(udev->mtd); + map_destroy(udev->mtd); + } + if(0 != udev->map.virt) { + iounmap(udev->map.virt); + udev->map.virt = NULL; + } + if(0 != udev->name) { + kfree(udev->name); + } + kfree(udev); + } +} + +module_init(uflash_init); +module_exit(uflash_cleanup); |