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-rw-r--r--drivers/mtd/maps/netsc520.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/mtd/maps/netsc520.c b/drivers/mtd/maps/netsc520.c
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+++ b/drivers/mtd/maps/netsc520.c
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/* 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
+ *
+ * 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 <linux/init.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.
+*/
+
+/* 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 const 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 ARRAY_SIZE(partition_info)
+
+#define WINDOW_SIZE 0x00100000
+#define WINDOW_ADDR 0x00200000
+
+static struct map_info netsc520_map = {
+ .name = "netsc520 Flash Bank",
+ .size = WINDOW_SIZE,
+ .bankwidth = 4,
+ .phys = WINDOW_ADDR,
+};
+
+#define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map)
+
+static struct mtd_info *mymtd;
+
+static int __init init_netsc520(void)
+{
+ printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n",
+ (unsigned long long)netsc520_map.size,
+ (unsigned long long)netsc520_map.phys);
+ netsc520_map.virt = ioremap(netsc520_map.phys, netsc520_map.size);
+
+ if (!netsc520_map.virt) {
+ printk("Failed to ioremap\n");
+ return -EIO;
+ }
+
+ simple_map_init(&netsc520_map);
+
+ mymtd = do_map_probe("cfi_probe", &netsc520_map);
+ if(!mymtd)
+ mymtd = do_map_probe("map_ram", &netsc520_map);
+ if(!mymtd)
+ mymtd = do_map_probe("map_rom", &netsc520_map);
+
+ if (!mymtd) {
+ iounmap(netsc520_map.virt);
+ return -ENXIO;
+ }
+
+ mymtd->owner = THIS_MODULE;
+ mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
+ return 0;
+}
+
+static void __exit cleanup_netsc520(void)
+{
+ if (mymtd) {
+ mtd_device_unregister(mymtd);
+ map_destroy(mymtd);
+ }
+ if (netsc520_map.virt) {
+ iounmap(netsc520_map.virt);
+ netsc520_map.virt = NULL;
+ }
+}
+
+module_init(init_netsc520);
+module_exit(cleanup_netsc520);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");
+MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");