atmel-mci: unified Atmel MCI drivers (AVR32 & AT91)

Unification of the atmel-mci driver to support the AT91 processors MCI
interface.  The atmel-mci driver currently supports the AVR32 and this
patch adds AT91 support.

Add read/write proof selection switch dependent on chip availability of
this feature.

To use this new driver on a at91 the platform driver for your board needs
to be updated.

[nicolas.ferre@atmel.com indent, Kconfig comment and one printk modification]
Signed-off-by: Rob Emanuele <rob@emanuele.us>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Andrew Victor <linux@maxim.org.za>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 42 insertions, 7 deletions

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 34fdfa968fe9..6f20eb93554b 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -160,6 +160,12 @@ config MMC_AU1X
 
           If unsure, say N.
 
+choice
+        prompt "Atmel SD/MMC Driver"
+        default MMC_ATMELMCI if AVR32
+        help
+          Choose which driver to use for the Atmel MCI Silicon
+
 config MMC_AT91
         tristate "AT91 SD/MMC Card Interface support"
         depends on ARCH_AT91
@@ -170,17 +176,19 @@ config MMC_AT91
 
 config MMC_ATMELMCI
         tristate "Atmel Multimedia Card Interface support"
-        depends on AVR32
+        depends on AVR32 || ARCH_AT91
         help
           This selects the Atmel Multimedia Card Interface driver. If
-          you have an AT32 (AVR32) platform with a Multimedia Card
-          slot, say Y or M here.
+          you have an AT32 (AVR32) or AT91 platform with a Multimedia
+          Card slot, say Y or M here.
 
           If unsure, say N.
 
+endchoice
+
 config MMC_ATMELMCI_DMA
         bool "Atmel MCI DMA support (EXPERIMENTAL)"
-        depends on MMC_ATMELMCI && DMA_ENGINE && EXPERIMENTAL
+        depends on MMC_ATMELMCI && AVR32 && DMA_ENGINE && EXPERIMENTAL
         help
           Say Y here to have the Atmel MCI driver use a DMA engine to
           do data transfers and thus increase the throughput and
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 7b603e4b41db..065fa818be57 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -30,6 +30,7 @@
 #include <asm/io.h>
 #include <asm/unaligned.h>
 
+#include <mach/cpu.h>
 #include <mach/board.h>
 
 #include "atmel-mci-regs.h"
@@ -210,6 +211,18 @@ struct atmel_mci_slot {
         set_bit(event, &host->pending_events)
 
 /*
+ * Enable or disable features/registers based on
+ * whether the processor supports them
+ */
+static bool mci_has_rwproof(void)
+{
+        if (cpu_is_at91sam9261() || cpu_is_at91rm9200())
+                return false;
+        else
+                return true;
+}
+
+/*
  * The debugfs stuff below is mostly optimized away when
  * CONFIG_DEBUG_FS is not set.
  */
@@ -276,8 +289,13 @@ static void atmci_show_status_reg(struct seq_file *s,
                 [3]     = "BLKE",
                 [4]     = "DTIP",
                 [5]     = "NOTBUSY",
+                [6]     = "ENDRX",
+                [7]     = "ENDTX",
                 [8]     = "SDIOIRQA",
                 [9]     = "SDIOIRQB",
+                [12]    = "SDIOWAIT",
+                [14]    = "RXBUFF",
+                [15]    = "TXBUFE",
                 [16]    = "RINDE",
                 [17]    = "RDIRE",
                 [18]    = "RCRCE",
@@ -285,6 +303,11 @@ static void atmci_show_status_reg(struct seq_file *s,
                 [20]    = "RTOE",
                 [21]    = "DCRCE",
                 [22]    = "DTOE",
+                [23]    = "CSTOE",
+                [24]    = "BLKOVRE",
+                [25]    = "DMADONE",
+                [26]    = "FIFOEMPTY",
+                [27]    = "XFRDONE",
                 [30]    = "OVRE",
                 [31]    = "UNRE",
         };
@@ -849,13 +872,15 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                         clkdiv = 255;
                 }
 
+                host->mode_reg = MCI_MR_CLKDIV(clkdiv);
+
                 /*
                  * WRPROOF and RDPROOF prevent overruns/underruns by
                  * stopping the clock when the FIFO is full/empty.
                  * This state is not expected to last for long.
                  */
-                host->mode_reg = MCI_MR_CLKDIV(clkdiv) | MCI_MR_WRPROOF
-                                        | MCI_MR_RDPROOF;
+                if (mci_has_rwproof())
+                        host->mode_reg |= (MCI_MR_WRPROOF | MCI_MR_RDPROOF);
 
                 if (list_empty(&host->queue))
                         mci_writel(host, MR, host->mode_reg);
@@ -1648,8 +1673,10 @@ static int __init atmci_probe(struct platform_device *pdev)
                         nr_slots++;
         }
 
-        if (!nr_slots)
+        if (!nr_slots) {
+                dev_err(&pdev->dev, "init failed: no slot defined\n");
                 goto err_init_slot;
+        }
 
         dev_info(&pdev->dev,
                         "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",