[MTD] maps/ixp4xx: half-word boundary and little-endian fixups

ixp4xx updates:
  - Handle reads that don't start on a half-word boundary.
  - Make it work when CPU is in little-endian mode.

Signed-off-by: John Bowler <jbowler@acm.org>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: David Vrabel <dvrabel@arcom.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 66 insertions, 12 deletions

diff --git a/drivers/mtd/maps/ixp4xx.c b/drivers/mtd/maps/ixp4xx.c
index a59f8027903..986c5862839 100644
--- a/drivers/mtd/maps/ixp4xx.c
+++ b/drivers/mtd/maps/ixp4xx.c
@@ -1,5 +1,5 @@
 /*
- * $Id: ixp4xx.c,v 1.12 2005/11/07 11:14:27 gleixner Exp $
+ * $Id: ixp4xx.c,v 1.13 2005/11/16 16:23:21 dvrabel Exp $
  *
  * drivers/mtd/maps/ixp4xx.c
  *
@@ -34,10 +34,55 @@
 
 #include <linux/reboot.h>
 
+/*
+ * Read/write a 16 bit word from flash address 'addr'.
+ *
+ * When the cpu is in little-endian mode it swizzles the address lines
+ * ('address coherency') so we need to undo the swizzling to ensure commands
+ * and the like end up on the correct flash address.
+ *
+ * To further complicate matters, due to the way the expansion bus controller
+ * handles 32 bit reads, the byte stream ABCD is stored on the flash as:
+ *     D15    D0
+ *     +---+---+
+ *     | A | B | 0
+ *     +---+---+
+ *     | C | D | 2
+ *     +---+---+
+ * This means that on LE systems each 16 bit word must be swapped. Note that
+ * this requires CONFIG_MTD_CFI_BE_BYTE_SWAP to be enabled to 'unswap' the CFI
+ * data and other flash commands which are always in D7-D0.
+ */
 #ifndef __ARMEB__
+#ifndef CONFIG_MTD_CFI_BE_BYTE_SWAP
+#  error CONFIG_MTD_CFI_BE_BYTE_SWAP required
+#endif
+
+static inline u16 flash_read16(void __iomem *addr)
+{
+        return be16_to_cpu(__raw_readw((void __iomem *)((unsigned long)addr ^ 0x2)));
+}
+
+static inline void flash_write16(u16 d, void __iomem *addr)
+{
+        __raw_writew(cpu_to_be16(d), (void __iomem *)((unsigned long)addr ^ 0x2));
+}
+
 #define BYTE0(h)        ((h) & 0xFF)
 #define BYTE1(h)        (((h) >> 8) & 0xFF)
+
 #else
+
+static inline u16 flash_read16(const void __iomem *addr)
+{
+        return __raw_readw(addr);
+}
+
+static inline void flash_write16(u16 d, void __iomem *addr)
+{
+        __raw_writew(d, addr);
+}
+
 #define BYTE0(h)        (((h) >> 8) & 0xFF)
 #define BYTE1(h)        ((h) & 0xFF)
 #endif
@@ -45,7 +90,7 @@
 static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
 {
         map_word val;
-        val.x[0] = le16_to_cpu(readw(map->virt + ofs));
+        val.x[0] = flash_read16(map->virt + ofs);
         return val;
 }
 
@@ -57,19 +102,28 @@ static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
 static void ixp4xx_copy_from(struct map_info *map, void *to,
                              unsigned long from, ssize_t len)
 {
-        int i;
         u8 *dest = (u8 *) to;
         void __iomem *src = map->virt + from;
-        u16 data;
 
-        for (i = 0; i < (len / 2); i++) {
-                data = le16_to_cpu(readw(src + 2*i));
-                dest[i * 2] = BYTE0(data);
-                dest[i * 2 + 1] = BYTE1(data);
+        if (len <= 0)
+                return;
+
+        if (from & 1) {
+                *dest++ = BYTE1(flash_read16(src));
+                src++;
+                --len;
         }
 
-        if (len & 1)
-                dest[len - 1] = BYTE0(le16_to_cpu(readw(src + 2*i)));
+        while (len >= 2) {
+                u16 data = flash_read16(src);
+                *dest++ = BYTE0(data);
+                *dest++ = BYTE1(data);
+                src += 2;
+                len -= 2;
+        }
+
+        if (len > 0)
+                *dest++ = BYTE0(flash_read16(src));
 }
 
 /*
@@ -79,7 +133,7 @@ static void ixp4xx_copy_from(struct map_info *map, void *to,
 static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
 {
         if (!(adr & 1))
-                writew(cpu_to_le16(d.x[0]), map->virt + adr);
+                flash_write16(d.x[0], map->virt + adr);
 }
 
 /*
@@ -87,7 +141,7 @@ static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long
  */
 static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
 {
-        writew(cpu_to_le16(d.x[0]), map->virt + adr);
+        flash_write16(d.x[0], map->virt + adr);
 }
 
 struct ixp4xx_flash_info {