/* $Id: sun_uflash.c,v 1.2 2007/09/21 03:09:24 quy 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 = 		(unsigned long)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((void *)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((void*)udev->map.virt);			udev->map.virt = 0;		}		if(0 != udev->name) {			kfree(udev->name);		}		kfree(udev);	}	}module_init(uflash_init);module_exit(uflash_cleanup);