patch-2.4.0-test3 linux/drivers/mtd/rpxlite.c

• Lines: 161
• Date: Tue Jul 4 10:10:05 2000
• Orig file: v2.4.0-test2/linux/drivers/mtd/rpxlite.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/drivers/mtd/rpxlite.c linux/drivers/mtd/rpxlite.c
@@ -0,0 +1,160 @@
+/*
+ * $Id: rpxlite.c,v 1.2 2000/07/04 12:16:26 dwmw2 Exp $
+ *
+ * Handle the strange 16-in-32-bit mapping on the RPXLite board
+ */
+
+#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>
+
+
+#define WINDOW_ADDR 0x8000000
+#define WINDOW_SIZE 0x2000000
+
+#define MAP_TO_ADR(x) ( ( ( x & ~1 ) << 1 ) | (x&1) )
+
+static struct mtd_info *mymtd;
+
+__u8 rpxlite_read8(struct map_info *map, unsigned long ofs)
+{
+	return readb(map->map_priv_1 + MAP_TO_ADR(ofs));
+}
+
+__u16 rpxlite_read16(struct map_info *map, unsigned long ofs)
+{
+	return readw(map->map_priv_1 + MAP_TO_ADR(ofs));
+}
+
+__u32 rpxlite_read32(struct map_info *map, unsigned long ofs)
+{
+	return readl(map->map_priv_1 + MAP_TO_ADR(ofs));
+}
+
+void rpxlite_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+	if (from & 1) {
+		*(__u8 *)to = readb(map->map_priv_1 + MAP_TO_ADR(from));
+		from++;
+		len--;
+	}
+	/* Can't do this if it's not aligned */
+	if (!((unsigned long)to & 1)) {
+		unsigned long fromadr = MAP_TO_ADR(from);
+
+		while (len > 1) {
+			*(__u16 *)to = readw(map->map_priv_1 + fromadr);
+			to += 2;
+			fromadr += 4;
+			from += 2;
+			len -= 2;
+		}
+	}
+	while(len) {
+		*(__u8 *)to = readb(map->map_priv_1 + MAP_TO_ADR(from));
+		to++;
+		from++;
+		len--;
+	}
+}
+
+void rpxlite_write8(struct map_info *map, __u8 d, unsigned long adr)
+{
+	writeb(d, map->map_priv_1 + MAP_TO_ADR(adr));
+}
+
+void rpxlite_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+	writew(d, map->map_priv_1 + MAP_TO_ADR(adr));
+}
+
+void rpxlite_write32(struct map_info *map, __u32 d, unsigned long adr)
+{
+	writel(d, map->map_priv_1 + MAP_TO_ADR(adr));
+}
+
+void rpxlite_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+	if (to & 1) {
+		writeb(*(__u8 *)from, map->map_priv_1 + MAP_TO_ADR(to));
+		from++;
+		len--;
+	}
+	/* Can't do this if it's not aligned */
+	if (!((unsigned long)from & 1)) {
+		unsigned long toadr = map->map_priv_1 + MAP_TO_ADR(to);
+
+		while (len > 1) {
+			writew(*(__u16 *)from, toadr);
+			from += 2;
+			toadr += 4;
+			to += 2;
+			len -= 2;
+		}
+	}
+	while(len) {
+		writeb(*(__u8 *)from, map->map_priv_1 + MAP_TO_ADR(to));
+		to++;
+		from++;
+		len--;
+	}
+}
+
+struct map_info rpxlite_map = {
+	"RPXLITE",
+	WINDOW_SIZE,
+	2,
+	rpxlite_read8,
+	rpxlite_read16,
+	rpxlite_read32,
+	rpxlite_copy_from,
+	rpxlite_write8,
+	rpxlite_write16,
+	rpxlite_write32,
+	rpxlite_copy_to,
+	0,
+	0
+};
+
+#if LINUX_VERSION_CODE < 0x20300
+#ifdef MODULE
+#define init_rpxlite init_module
+#define cleanup_rpxlite cleanup_module
+#endif
+#endif
+
+int __init init_rpxlite(void)
+{
+       	printk(KERN_NOTICE "rpxlite flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
+	rpxlite_map.map_priv_1 = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE * 2);
+
+	if (!rpxlite_map.map_priv_1) {
+		printk("Failed to ioremap\n");
+		return -EIO;
+	}
+	mymtd = do_cfi_probe(&rpxlite_map);
+	if (mymtd) {
+#ifdef MODULE
+		mymtd->module = &__this_module;
+#endif
+		add_mtd_device(mymtd);
+		return 0;
+	}
+
+	return -ENXIO;
+}
+
+static void __exit cleanup_rpxlite(void)
+{
+	if (mymtd) {
+		del_mtd_device(mymtd);
+		map_destroy(mymtd);
+	}
+	if (rpxlite_map.map_priv_1) {
+		iounmap((void *)rpxlite_map.map_priv_1);
+		rpxlite_map.map_priv_1 = 0;
+	}
+}