patch-2.4.19 linux-2.4.19/drivers/mtd/maps/epxa10db-flash.c

• Lines: 220
• Date: Fri Aug 2 17:39:44 2002
• Orig file: linux-2.4.18/drivers/mtd/maps/epxa10db-flash.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/drivers/mtd/maps/epxa10db-flash.c linux-2.4.19/drivers/mtd/maps/epxa10db-flash.c
@@ -0,0 +1,219 @@
+/*
+ * Flash memory access on EPXA based devices
+ *
+ * (C) 2000 Nicolas Pitre <nico@cam.org>
+ *  Copyright (C) 2001 Altera Corporation
+ *  Copyright (C) 2001 Red Hat, Inc.
+ *
+ * $Id: epxa10db-flash.c,v 1.2 2001/12/19 13:00:19 jskov 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/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/hardware.h>
+
+static int nr_parts = 0;
+static struct mtd_partition *parts;
+
+static struct mtd_info *mymtd;
+
+extern int parse_redboot_partitions(struct mtd_info *, struct mtd_partition **);
+static int epxa10db_default_partitions(struct mtd_info *master, struct mtd_partition **pparts);
+
+static __u8 epxa10db_read8(struct map_info *map, unsigned long ofs)
+{
+	return __raw_readb(map->map_priv_1 + ofs);
+}
+
+static __u16 epxa10db_read16(struct map_info *map, unsigned long ofs)
+{
+	return __raw_readw(map->map_priv_1 + ofs);
+}
+
+static __u32 epxa10db_read32(struct map_info *map, unsigned long ofs)
+{
+	return __raw_readl(map->map_priv_1 + ofs);
+}
+
+static void epxa10db_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+	memcpy_fromio(to, (void *)(map->map_priv_1 + from), len);
+}
+
+static void epxa10db_write8(struct map_info *map, __u8 d, unsigned long adr)
+{
+	__raw_writeb(d, map->map_priv_1 + adr);
+	mb();
+}
+
+static void epxa10db_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+	__raw_writew(d, map->map_priv_1 + adr);
+	mb();
+}
+
+static void epxa10db_write32(struct map_info *map, __u32 d, unsigned long adr)
+{
+	__raw_writel(d, map->map_priv_1 + adr);
+	mb();
+}
+
+static void epxa10db_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+	memcpy_toio((void *)(map->map_priv_1 + to), from, len);
+}
+
+
+
+static struct map_info epxa10db_map = {
+	name:		"EPXA10DB flash",
+	size:		FLASH_SIZE,
+	buswidth:	2,
+	read8:		epxa10db_read8,
+	read16:		epxa10db_read16,
+	read32:		epxa10db_read32,
+	copy_from:	epxa10db_copy_from,
+	write8:		epxa10db_write8,
+	write16:	epxa10db_write16,
+	write32:	epxa10db_write32,
+	copy_to:	epxa10db_copy_to
+};
+
+
+static int __init epxa10db_mtd_init(void)
+{
+	int i;
+	printk(KERN_NOTICE "Epxa10db flash device: %x at %x\n", FLASH_SIZE, FLASH_START);
+	epxa10db_map.map_priv_1 = (unsigned long)ioremap(FLASH_START, FLASH_SIZE);
+	if (!epxa10db_map.map_priv_1) {
+		printk("Failed to ioremap Epxa10db flash\n");
+		return -EIO;
+	}
+
+	mymtd = do_map_probe("cfi_probe", &epxa10db_map);
+	if (!mymtd) {
+		iounmap((void *)epxa10db_map.map_priv_1);
+		return -ENXIO;
+	}
+
+	mymtd->module = THIS_MODULE;
+
+	/* Unlock the flash device. */
+	for (i=0; i<mymtd->numeraseregions;i++){
+		int j;
+		for(j=0;j<mymtd->eraseregions[i].numblocks;j++){
+			mymtd->unlock(mymtd,mymtd->eraseregions[i].offset + j * mymtd->eraseregions[i].erasesize,4);
+		}
+	}
+
+#ifdef CONFIG_MTD_REDBOOT_PARTS
+	nr_parts = parse_redboot_partitions(mymtd, &parts);
+
+	if (nr_parts > 0) {
+		add_mtd_partitions(mymtd, parts, nr_parts);
+		return 0;
+	}
+#endif
+#ifdef CONFIG_MTD_AFS_PARTS
+	nr_parts = parse_afs_partitions(mymtd, &parts);
+
+	if (nr_parts > 0) {
+		add_mtd_partitions(mymtd, parts, nr_parts);
+		return 0;
+	}
+#endif
+
+	/* No recognised partitioning schemes found - use defaults */
+	nr_parts = epxa10db_default_partitions(mymtd, &parts);
+	if (nr_parts > 0) {
+		add_mtd_partitions(mymtd, parts, nr_parts);
+		return 0;
+	}
+
+	/* If all else fails... */
+	add_mtd_device(mymtd);
+	return 0;
+}
+
+static void __exit epxa10db_mtd_cleanup(void)
+{
+	if (mymtd) {
+		if (nr_parts)
+			del_mtd_partitions(mymtd);
+		else
+			del_mtd_device(mymtd);
+		map_destroy(mymtd);
+	}
+	if (epxa10db_map.map_priv_1) {
+		iounmap((void *)epxa10db_map.map_priv_1);
+		epxa10db_map.map_priv_1 = 0;
+	}
+}
+
+
+/* 
+ * This will do for now, once we decide which bootldr we're finally 
+ * going to use then we'll remove this function and do it properly
+ *
+ * Partions are currently (as offsets from base of flash):
+ * 0x00000000 - 0x003FFFFF - bootloader (!)
+ * 0x00400000 - 0x00FFFFFF - Flashdisk
+ */
+
+static int __init epxa10db_default_partitions(struct mtd_info *master, struct mtd_partition **pparts)
+{
+	struct mtd_partition *parts;
+	int ret, i;
+	int npartitions = 0;
+	char *names; 
+	const char *name = "jffs";
+
+	printk("Using default partitions for epxa10db\n");
+	npartitions=1;
+	parts = kmalloc(npartitions*sizeof(*parts)+strlen(name), GFP_KERNEL);
+	if (!parts) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	i=0;
+	names = (char *)&parts[npartitions];	
+	parts[i].name = names;
+	names += strlen(name) + 1;
+	strcpy(parts[i].name, name);
+
+	parts[i].size = FLASH_SIZE-0x00400000;
+	parts[i].offset = 0x00400000;
+	parts[i].mask_flags = 0;
+
+ out:
+	*pparts = parts;
+	return npartitions;
+}
+
+module_init(epxa10db_mtd_init);
+module_exit(epxa10db_mtd_cleanup);
+
+MODULE_AUTHOR("Clive Davies");
+MODULE_DESCRIPTION("Altera epxa10db mtd flash map");
+MODULE_LICENSE("GPL");