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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/mtd/maps/bast-flash.c
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/mtd/maps/bast-flash.c')
-rw-r--r--drivers/mtd/maps/bast-flash.c227
1 files changed, 227 insertions, 0 deletions
diff --git a/drivers/mtd/maps/bast-flash.c b/drivers/mtd/maps/bast-flash.c
new file mode 100644
index 00000000000..44de3a81b27
--- /dev/null
+++ b/drivers/mtd/maps/bast-flash.c
@@ -0,0 +1,227 @@
+/* linux/drivers/mtd/maps/bast_flash.c
+ *
+ * Copyright (c) 2004 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * Simtec Bast (EB2410ITX) NOR MTD Mapping driver
+ *
+ * Changelog:
+ * 20-Sep-2004 BJD Initial version
+ *
+ * $Id: bast-flash.c,v 1.1 2004/09/21 14:29:04 bjd Exp $
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+#include <asm/mach-types.h>
+#include <asm/mach/flash.h>
+
+#include <asm/arch/map.h>
+#include <asm/arch/bast-map.h>
+#include <asm/arch/bast-cpld.h>
+
+#ifdef CONFIG_MTD_BAST_MAXSIZE
+#define AREA_MAXSIZE (CONFIG_MTD_BAST_MAXSIZE * (1024*1024))
+#else
+#define AREA_MAXSIZE (32*1024*1024)
+#endif
+
+#define PFX "bast-flash: "
+
+struct bast_flash_info {
+ struct mtd_info *mtd;
+ struct map_info map;
+ struct mtd_partition *partitions;
+ struct resource *area;
+};
+
+static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
+
+static struct bast_flash_info *to_bast_info(struct device *dev)
+{
+ return (struct bast_flash_info *)dev_get_drvdata(dev);
+}
+
+static void bast_flash_setrw(int to)
+{
+ unsigned int val;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ val = __raw_readb(BAST_VA_CTRL3);
+
+ if (to)
+ val |= BAST_CPLD_CTRL3_ROMWEN;
+ else
+ val &= ~BAST_CPLD_CTRL3_ROMWEN;
+
+ pr_debug("new cpld ctrl3=%02x\n", val);
+
+ __raw_writeb(val, BAST_VA_CTRL3);
+ local_irq_restore(flags);
+}
+
+static int bast_flash_remove(struct device *dev)
+{
+ struct bast_flash_info *info = to_bast_info(dev);
+
+ dev_set_drvdata(dev, NULL);
+
+ if (info == NULL)
+ return 0;
+
+ if (info->map.virt != NULL)
+ iounmap(info->map.virt);
+
+ if (info->mtd) {
+ del_mtd_partitions(info->mtd);
+ map_destroy(info->mtd);
+ }
+
+ if (info->partitions)
+ kfree(info->partitions);
+
+ if (info->area) {
+ release_resource(info->area);
+ kfree(info->area);
+ }
+
+ kfree(info);
+
+ return 0;
+}
+
+static int bast_flash_probe(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct bast_flash_info *info;
+ struct resource *res;
+ int err = 0;
+
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (info == NULL) {
+ printk(KERN_ERR PFX "no memory for flash info\n");
+ err = -ENOMEM;
+ goto exit_error;
+ }
+
+ memzero(info, sizeof(*info));
+ dev_set_drvdata(dev, info);
+
+ res = pdev->resource; /* assume that the flash has one resource */
+
+ info->map.phys = res->start;
+ info->map.size = res->end - res->start + 1;
+ info->map.name = dev->bus_id;
+ info->map.bankwidth = 2;
+
+ if (info->map.size > AREA_MAXSIZE)
+ info->map.size = AREA_MAXSIZE;
+
+ pr_debug("%s: area %08lx, size %ld\n", __FUNCTION__,
+ info->map.phys, info->map.size);
+
+ info->area = request_mem_region(res->start, info->map.size,
+ pdev->name);
+ if (info->area == NULL) {
+ printk(KERN_ERR PFX "cannot reserve flash memory region\n");
+ err = -ENOENT;
+ goto exit_error;
+ }
+
+ info->map.virt = ioremap(res->start, info->map.size);
+ pr_debug("%s: virt at %08x\n", __FUNCTION__, (int)info->map.virt);
+
+ if (info->map.virt == 0) {
+ printk(KERN_ERR PFX "failed to ioremap() region\n");
+ err = -EIO;
+ goto exit_error;
+ }
+
+ simple_map_init(&info->map);
+
+ /* enable the write to the flash area */
+
+ bast_flash_setrw(1);
+
+ /* probe for the device(s) */
+
+ info->mtd = do_map_probe("jedec_probe", &info->map);
+ if (info->mtd == NULL)
+ info->mtd = do_map_probe("cfi_probe", &info->map);
+
+ if (info->mtd == NULL) {
+ printk(KERN_ERR PFX "map_probe() failed\n");
+ err = -ENXIO;
+ goto exit_error;
+ }
+
+ /* mark ourselves as the owner */
+ info->mtd->owner = THIS_MODULE;
+
+ err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
+ if (err > 0) {
+ err = add_mtd_partitions(info->mtd, info->partitions, err);
+ if (err)
+ printk(KERN_ERR PFX "cannot add/parse partitions\n");
+ }
+
+ if (err == 0)
+ return 0;
+
+ /* fall through to exit error */
+
+ exit_error:
+ bast_flash_remove(dev);
+ return err;
+}
+
+static struct device_driver bast_flash_driver = {
+ .name = "bast-nor",
+ .bus = &platform_bus_type,
+ .probe = bast_flash_probe,
+ .remove = bast_flash_remove,
+};
+
+static int __init bast_flash_init(void)
+{
+ printk("BAST NOR-Flash Driver, (c) 2004 Simtec Electronics\n");
+ return driver_register(&bast_flash_driver);
+}
+
+static void __exit bast_flash_exit(void)
+{
+ driver_unregister(&bast_flash_driver);
+}
+
+module_init(bast_flash_init);
+module_exit(bast_flash_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("BAST MTD Map driver");