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path: root/drivers/mtd/maps/sun_uflash.c
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Diffstat (limited to 'drivers/mtd/maps/sun_uflash.c')
-rw-r--r--drivers/mtd/maps/sun_uflash.c177
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 000000000000..29091d10030a
--- /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);