/*
- * $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
*
#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
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;
}
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));
}
/*
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);
}
/*
*/
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 {
static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
-static int ixp4xx_flash_remove(struct device *_dev)
+static int ixp4xx_flash_remove(struct platform_device *dev)
{
- struct platform_device *dev = to_platform_device(_dev);
struct flash_platform_data *plat = dev->dev.platform_data;
- struct ixp4xx_flash_info *info = dev_get_drvdata(&dev->dev);
+ struct ixp4xx_flash_info *info = platform_get_drvdata(dev);
- dev_set_drvdata(&dev->dev, NULL);
+ platform_set_drvdata(dev, NULL);
if(!info)
return 0;
return 0;
}
-static int ixp4xx_flash_probe(struct device *_dev)
+static int ixp4xx_flash_probe(struct platform_device *dev)
{
- struct platform_device *dev = to_platform_device(_dev);
struct flash_platform_data *plat = dev->dev.platform_data;
struct ixp4xx_flash_info *info;
int err = -1;
}
memzero(info, sizeof(struct ixp4xx_flash_info));
- dev_set_drvdata(&dev->dev, info);
+ platform_set_drvdata(dev, info);
/*
* Tell the MTD layer we're not 1:1 mapped so that it does
/* Use the fast version */
info->map.write = ixp4xx_write16,
- err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
+ err = parse_mtd_partitions(info->mtd, probes, &info->partitions, dev->resource->start);
if (err > 0) {
err = add_mtd_partitions(info->mtd, info->partitions, err);
if(err)
return 0;
Error:
- ixp4xx_flash_remove(_dev);
+ ixp4xx_flash_remove(dev);
return err;
}
-static struct device_driver ixp4xx_flash_driver = {
- .name = "IXP4XX-Flash",
- .bus = &platform_bus_type,
+static struct platform_driver ixp4xx_flash_driver = {
.probe = ixp4xx_flash_probe,
.remove = ixp4xx_flash_remove,
+ .driver = {
+ .name = "IXP4XX-Flash",
+ },
};
static int __init ixp4xx_flash_init(void)
{
- return driver_register(&ixp4xx_flash_driver);
+ return platform_driver_register(&ixp4xx_flash_driver);
}
static void __exit ixp4xx_flash_exit(void)
{
- driver_unregister(&ixp4xx_flash_driver);
+ platform_driver_unregister(&ixp4xx_flash_driver);
}
projects / powerpc.git / blobdiff