patch-2.4.6 linux/drivers/mtd/maps/netsc520.c

• Lines: 193
• Date: Tue Jun 12 10:30:27 2001
• Orig file: v2.4.5/linux/drivers/mtd/maps/netsc520.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/maps/netsc520.c linux/drivers/mtd/maps/netsc520.c
@@ -0,0 +1,192 @@
+/* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board
+ *
+ * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com)
+ *	based on sc520cdp.c by Sysgo Real-Time Solutions GmbH
+ *
+ * $Id: netsc520.c,v 1.3 2001/06/02 14:52:23 dwmw2 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
+ *
+ * The NetSc520 is a demonstration board for the Elan Sc520 processor available
+ * from AMD.  It has a single back of 16 megs of 32-bit Flash ROM and another
+ * 16 megs of SDRAM.
+ */
+
+#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>
+
+
+/*
+** The single, 16 megabyte flash bank is divided into four virtual
+** partitions.  The first partition is 768 KiB and is intended to
+** store the kernel image loaded by the bootstrap loader.  The second
+** partition is 256 KiB and holds the BIOS image.  The third 
+** partition is 14.5 MiB and is intended for the flash file system
+** image.  The last partition is 512 KiB and contains another copy
+** of the BIOS image and the reset vector.
+**
+** Only the third partition should be mounted.  The first partition
+** should not be mounted, but it can erased and written to using the
+** MTD character routines.  The second and fourth partitions should
+** not be touched - it is possible to corrupt the BIOS image by
+** mounting these partitions, and potentially the board will not be
+** recoverable afterwards.
+*/
+
+static __u8 netsc520_read8(struct map_info *map, unsigned long ofs)
+{
+	return readb(map->map_priv_1 + ofs);
+}
+
+static __u16 netsc520_read16(struct map_info *map, unsigned long ofs)
+{
+	return readw(map->map_priv_1 + ofs);
+}
+
+static __u32 netsc520_read32(struct map_info *map, unsigned long ofs)
+{
+	return readl(map->map_priv_1 + ofs);
+}
+
+static void netsc520_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 netsc520_write8(struct map_info *map, __u8 d, unsigned long adr)
+{
+	writeb(d, map->map_priv_1 + adr);
+}
+
+static void netsc520_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+	writew(d, map->map_priv_1 + adr);
+}
+
+static void netsc520_write32(struct map_info *map, __u32 d, unsigned long adr)
+{
+	writel(d, map->map_priv_1 + adr);
+}
+
+static void netsc520_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);
+}
+
+/* partition_info gives details on the logical partitions that the split the 
+ * single flash device into. If the size if zero we use up to the end of the
+ * device. */
+static struct mtd_partition partition_info[]={
+    { 
+	    name: "NetSc520 boot kernel", 
+	    offset: 0, 
+	    size: 	0xc0000
+    },
+    { 
+	    name: "NetSc520 Low BIOS", 
+	    offset: 0xc0000, 
+	    size: 	0x40000
+    },
+    { 
+	    name: "NetSc520 file system", 
+	    offset: 0x100000, 
+	    size: 	0xe80000
+    },
+    { 
+	    name: "NetSc520 High BIOS", 
+	    offset: 0xf80000, 
+	    size: 0x80000
+    },
+};
+#define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0]))
+
+/*
+ * If no idea what is going on here.  This is taken from the FlashFX stuff.
+ */
+#define ROMCS 1
+
+
+#define WINDOW_SIZE	0x00100000
+#define WINDOW_ADDR	0x00200000
+
+static struct map_info netsc520_map = {
+	name: "netsc520 Flash Bank",
+	size: WINDOW_SIZE,
+	buswidth: 4,
+	read8: netsc520_read8,
+	read16: netsc520_read16,
+	read32: netsc520_read32,
+	copy_from: netsc520_copy_from,
+	write8: netsc520_write8,
+	write16: netsc520_write16,
+	write32: netsc520_write32,
+	copy_to: netsc520_copy_to,
+	map_priv_2: WINDOW_ADDR
+};
+
+#define NUM_FLASH_BANKS	(sizeof(netsc520_map)/sizeof(struct map_info))
+
+static struct mtd_info *mymtd;
+
+#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
+#define init_netsc520 init_module
+#define cleanup_netsc520 cleanup_module
+#endif
+
+
+static int __init init_netsc520(void)
+{
+	printk(KERN_NOTICE "NetSc520 flash device: %lx at %lx\n", netsc520_map.size, netsc520_map.map_priv_2);
+	netsc520_map.map_priv_1 = (unsigned long)ioremap_nocache(netsc520_map.map_priv_2, netsc520_map.size);
+
+	if (!netsc520_map.map_priv_1) {
+		printk("Failed to ioremap_nocache\n");
+		return -EIO;
+	}
+	mymtd = do_map_probe("cfi", &netsc520_map);
+	if(!mymtd)
+		mymtd = do_map_probe("ram", &netsc520_map);
+	if(!mymtd)
+		mymtd = do_map_probe("rom", &netsc520_map);
+
+	if (!mymtd) {
+		iounmap((void *)netsc520_map.map_priv_1);
+		return -ENXIO;
+	}
+		
+	mymtd->module = THIS_MODULE;
+	add_mtd_partitions( mymtd, partition_info, NUM_PARTITIONS );
+	return 0;
+}
+
+static void __exit cleanup_netsc520(void)
+{
+	if (mymtd) {
+		del_mtd_partitions(mymtd);
+		map_destroy(mymtd);
+	}
+	if (netsc520_map.map_priv_1) {
+		iounmap((void *)netsc520_map.map_priv_1);
+		netsc520_map.map_priv_1 = 0;
+	}
+}
+
+module_init(init_netsc520);
+module_exit(cleanup_netsc520);