mmc-omap: add support for 16-bit and 32-bit registers

The omap850 and omap730 use 16-bit registers instead of 32-bit, requiring
a modification of the register addresses in the mmc-omap driver.  To
resolve this, a bit shift is performed on base register addresses, either
by 1 or 2 bits depending on the CPU in use.  This yields the correct
registers for each CPU.

Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Signed-off-by: Cory Maccarrone <darkstar6262@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Cc: Ladislav Michl <ladis@linux-mips.org>
Cc: Ben Dooks <ben@fluff.org>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 33 insertions, 29 deletions

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 84d280406341..475490b18570 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -39,30 +39,30 @@
 #include <plat/fpga.h>
 
 #define OMAP_MMC_REG_CMD        0x00
-#define OMAP_MMC_REG_ARGL       0x04
-#define OMAP_MMC_REG_ARGH       0x08
-#define OMAP_MMC_REG_CON        0x0c
-#define OMAP_MMC_REG_STAT       0x10
-#define OMAP_MMC_REG_IE         0x14
-#define OMAP_MMC_REG_CTO        0x18
-#define OMAP_MMC_REG_DTO        0x1c
-#define OMAP_MMC_REG_DATA       0x20
-#define OMAP_MMC_REG_BLEN       0x24
-#define OMAP_MMC_REG_NBLK       0x28
-#define OMAP_MMC_REG_BUF        0x2c
-#define OMAP_MMC_REG_SDIO       0x34
-#define OMAP_MMC_REG_REV        0x3c
-#define OMAP_MMC_REG_RSP0       0x40
-#define OMAP_MMC_REG_RSP1       0x44
-#define OMAP_MMC_REG_RSP2       0x48
-#define OMAP_MMC_REG_RSP3       0x4c
-#define OMAP_MMC_REG_RSP4       0x50
-#define OMAP_MMC_REG_RSP5       0x54
-#define OMAP_MMC_REG_RSP6       0x58
-#define OMAP_MMC_REG_RSP7       0x5c
-#define OMAP_MMC_REG_IOSR       0x60
-#define OMAP_MMC_REG_SYSC       0x64
-#define OMAP_MMC_REG_SYSS       0x68
+#define OMAP_MMC_REG_ARGL       0x01
+#define OMAP_MMC_REG_ARGH       0x02
+#define OMAP_MMC_REG_CON        0x03
+#define OMAP_MMC_REG_STAT       0x04
+#define OMAP_MMC_REG_IE         0x05
+#define OMAP_MMC_REG_CTO        0x06
+#define OMAP_MMC_REG_DTO        0x07
+#define OMAP_MMC_REG_DATA       0x08
+#define OMAP_MMC_REG_BLEN       0x09
+#define OMAP_MMC_REG_NBLK       0x0a
+#define OMAP_MMC_REG_BUF        0x0b
+#define OMAP_MMC_REG_SDIO       0x0d
+#define OMAP_MMC_REG_REV        0x0f
+#define OMAP_MMC_REG_RSP0       0x10
+#define OMAP_MMC_REG_RSP1       0x11
+#define OMAP_MMC_REG_RSP2       0x12
+#define OMAP_MMC_REG_RSP3       0x13
+#define OMAP_MMC_REG_RSP4       0x14
+#define OMAP_MMC_REG_RSP5       0x15
+#define OMAP_MMC_REG_RSP6       0x16
+#define OMAP_MMC_REG_RSP7       0x17
+#define OMAP_MMC_REG_IOSR       0x18
+#define OMAP_MMC_REG_SYSC       0x19
+#define OMAP_MMC_REG_SYSS       0x1a
 
 #define OMAP_MMC_STAT_CARD_ERR          (1 << 14)
 #define OMAP_MMC_STAT_CARD_IRQ          (1 << 13)
@@ -78,8 +78,9 @@
 #define OMAP_MMC_STAT_CARD_BUSY         (1 <<  2)
 #define OMAP_MMC_STAT_END_OF_CMD        (1 <<  0)
 
-#define OMAP_MMC_READ(host, reg)        __raw_readw((host)->virt_base + OMAP_MMC_REG_##reg)
-#define OMAP_MMC_WRITE(host, reg, val)  __raw_writew((val), (host)->virt_base + OMAP_MMC_REG_##reg)
+#define OMAP_MMC_REG(host, reg)         (OMAP_MMC_REG_##reg << (host)->reg_shift)
+#define OMAP_MMC_READ(host, reg)        __raw_readw((host)->virt_base + OMAP_MMC_REG(host, reg))
+#define OMAP_MMC_WRITE(host, reg, val)  __raw_writew((val), (host)->virt_base + OMAP_MMC_REG(host, reg))
 
 /*
  * Command types
@@ -133,6 +134,7 @@ struct mmc_omap_host {
         int                     irq;
         unsigned char           bus_mode;
         unsigned char           hw_bus_mode;
+        unsigned int            reg_shift;
 
         struct work_struct      cmd_abort_work;
         unsigned                abort:1;
@@ -680,9 +682,9 @@ mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
         host->data->bytes_xfered += n;
 
         if (write) {
-                __raw_writesw(host->virt_base + OMAP_MMC_REG_DATA, host->buffer, n);
+                __raw_writesw(host->virt_base + OMAP_MMC_REG(host, DATA), host->buffer, n);
         } else {
-                __raw_readsw(host->virt_base + OMAP_MMC_REG_DATA, host->buffer, n);
+                __raw_readsw(host->virt_base + OMAP_MMC_REG(host, DATA), host->buffer, n);
         }
 }
 
@@ -900,7 +902,7 @@ mmc_omap_prepare_dma(struct mmc_omap_host *host, struct mmc_data *data)
         int dst_port = 0;
         int sync_dev = 0;
 
-        data_addr = host->phys_base + OMAP_MMC_REG_DATA;
+        data_addr = host->phys_base + OMAP_MMC_REG(host, DATA);
         frame = data->blksz;
         count = sg_dma_len(sg);
 
@@ -1493,6 +1495,8 @@ static int __init mmc_omap_probe(struct platform_device *pdev)
                 }
         }
 
+        host->reg_shift = (cpu_is_omap7xx() ? 1 : 2);
+
         return 0;
 
 err_plat_cleanup: