linux-kernel - [PATCH 1/6] atmel-mci: Unified Atmel MCI drivers (AVR32 & AT91)

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Date:	Tue, 16 Jun 2009 17:54:34 -0700
From:	Rob Emanuele <rob@...nuele.us>
To:	nicolas.ferre@...el.com
Cc:	haavard.skinnemoen@...el.com,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org, Rob Emanuele <rob@...nuele.us>
Subject: [PATCH 1/6] 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.

To use this new driver on a at91 the platform driver for your board needs to updated.  See the following patch for an example of how to do that.

Signed-off-by: Rob Emanuele <rob@...nuele.us>
---
 drivers/mmc/host/Kconfig     |   16 ++++++++++++----
 drivers/mmc/host/atmel-mci.c |   37 +++++++++++++++++++++++++++++++++----
 2 files changed, 45 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 40111a6..a0eaf69 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -135,6 +135,12 @@ config MMC_AU1X
 
 	  If unsure, say N.
 
+choice
+	prompt "Atmel 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
@@ -145,17 +151,19 @@ 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 7b603e4..98b25de 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -30,11 +30,14 @@
 #include <asm/io.h>
 #include <asm/unaligned.h>
 
+#include <mach/cpu.h>
 #include <mach/board.h>
 
 #include "atmel-mci-regs.h"
 
-#define ATMCI_DATA_ERROR_FLAGS	(MCI_DCRCE | MCI_DTOE | MCI_OVRE | MCI_UNRE)
+#define ATMCI_DATA_ERROR_FLAGS	(MCI_RINDE | MCI_RDIRE | MCI_RCRCE  \
+				 | MCI_RENDE | MCI_RTOE | MCI_DCRCE \
+				 | MCI_DTOE | MCI_OVRE | MCI_UNRE)
 #define ATMCI_DMA_THRESHOLD	16
 
 enum {
@@ -210,6 +213,18 @@ 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 +291,13 @@ 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 +305,11 @@ 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 +874,15 @@ 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 +1675,10 @@ static int __init atmci_probe(struct platform_device *pdev)
 			nr_slots++;
 	}
 
-	if (!nr_slots)
+	if (!nr_slots) {
+		printk(KERN_ERR "Atmel MCI controller init failed.  atmci_init_slot error or no slots with bus_width > 0.\n");
 		goto err_init_slot;
+	}
 
 	dev_info(&pdev->dev,
 			"Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
-- 
1.6.0.4

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