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

• Lines: 120
• Date: Tue Jun 12 10:30:27 2001
• Orig file: v2.4.5/linux/drivers/mtd/maps/physmap.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/maps/physmap.c linux/drivers/mtd/maps/physmap.c
@@ -0,0 +1,119 @@
+/*
+ * $Id: physmap.c,v 1.13 2001/06/10 00:14:55 dwmw2 Exp $
+ *
+ * Normal mappings of chips in physical memory
+ */
+
+#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/config.h>
+
+
+#define WINDOW_ADDR CONFIG_MTD_PHYSMAP_START
+#define WINDOW_SIZE CONFIG_MTD_PHYSMAP_LEN
+#define BUSWIDTH CONFIG_MTD_PHYSMAP_BUSWIDTH
+
+static struct mtd_info *mymtd;
+
+__u8 physmap_read8(struct map_info *map, unsigned long ofs)
+{
+	return __raw_readb(map->map_priv_1 + ofs);
+}
+
+__u16 physmap_read16(struct map_info *map, unsigned long ofs)
+{
+	return __raw_readw(map->map_priv_1 + ofs);
+}
+
+__u32 physmap_read32(struct map_info *map, unsigned long ofs)
+{
+	return __raw_readl(map->map_priv_1 + ofs);
+}
+
+void physmap_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+	memcpy_fromio(to, map->map_priv_1 + from, len);
+}
+
+void physmap_write8(struct map_info *map, __u8 d, unsigned long adr)
+{
+	__raw_writeb(d, map->map_priv_1 + adr);
+	mb();
+}
+
+void physmap_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+	__raw_writew(d, map->map_priv_1 + adr);
+	mb();
+}
+
+void physmap_write32(struct map_info *map, __u32 d, unsigned long adr)
+{
+	__raw_writel(d, map->map_priv_1 + adr);
+	mb();
+}
+
+void physmap_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+	memcpy_toio(map->map_priv_1 + to, from, len);
+}
+
+struct map_info physmap_map = {
+	name: "Physically mapped flash",
+	size: WINDOW_SIZE,
+	buswidth: BUSWIDTH,
+	read8: physmap_read8,
+	read16: physmap_read16,
+	read32: physmap_read32,
+	copy_from: physmap_copy_from,
+	write8: physmap_write8,
+	write16: physmap_write16,
+	write32: physmap_write32,
+	copy_to: physmap_copy_to
+};
+
+#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
+#define init_physmap init_module
+#define cleanup_physmap cleanup_module
+#endif
+
+int __init init_physmap(void)
+{
+       	printk(KERN_NOTICE "physmap flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
+	physmap_map.map_priv_1 = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);
+
+	if (!physmap_map.map_priv_1) {
+		printk("Failed to ioremap\n");
+		return -EIO;
+	}
+	mymtd = do_map_probe("cfi", &physmap_map);
+	if (mymtd) {
+		mymtd->module = THIS_MODULE;
+
+		add_mtd_device(mymtd);
+		return 0;
+	}
+
+	iounmap((void *)physmap_map.map_priv_1);
+	return -ENXIO;
+}
+
+static void __exit cleanup_physmap(void)
+{
+	if (mymtd) {
+		del_mtd_device(mymtd);
+		map_destroy(mymtd);
+	}
+	if (physmap_map.map_priv_1) {
+		iounmap((void *)physmap_map.map_priv_1);
+		physmap_map.map_priv_1 = 0;
+	}
+}
+
+module_init(init_physmap);
+module_exit(cleanup_physmap);
+