linux-kernel - [PATCH 1/2] mmc: make sdhci work with ricoh mmc controller

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Date:	Mon,  7 Jun 2010 00:28:50 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	" linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Cc:	Philip Langdale <philipl@...rt.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Andrew de Quincey <adq_dvb@...skialf.net>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: [PATCH 1/2] mmc: make sdhci work with ricoh mmc controller

The current way of disabling it is not well tested by vendor
and has all kinds of bugs that show up on resume from ram/disk.

Old way of disabling is still supported by
continuing to use CONFIG_MMC_RICOH_MMC.

Based on 'http://list.drzeus.cx/pipermail/sdhci-devel/2007-December/002085.html'
Most of the credit for this goes to Andrew de Quincey


Signed-off-by: Maxim Levitsky <maximlevitsky@...il.com>
CC: Andrew de Quincey <adq_dvb@...skialf.net>
CC: linux-mmc@...r.kernel.org <linux-mmc@...r.kernel.org>
---
 drivers/mmc/host/sdhci-pci.c |   31 +++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci.c     |    3 ++-
 drivers/mmc/host/sdhci.h     |    4 ++++
 3 files changed, 37 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
index 65483fd..c4bcaeb 100644
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -17,6 +17,7 @@
 #include <linux/pci.h>
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
+#include <linux/device.h>
 
 #include <linux/mmc/host.h>
 
@@ -84,7 +85,21 @@ static int ricoh_probe(struct sdhci_pci_chip *chip)
 	if (chip->pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG ||
 	    chip->pdev->subsystem_vendor == PCI_VENDOR_ID_SONY)
 		chip->quirks |= SDHCI_QUIRK_NO_CARD_NO_RESET;
+	return 0;
+}
+
+static int ricoh_mmc_probe_slot(struct sdhci_pci_slot *slot)
+{
+	slot->host->caps =
+		((0x21 << SDHCI_TIMEOUT_CLK_SHIFT)
+			& SDHCI_TIMEOUT_CLK_MASK) |
 
+		((0x21 << SDHCI_CLOCK_BASE_SHIFT)
+			& SDHCI_CLOCK_BASE_MASK) |
+
+		SDHCI_TIMEOUT_CLK_UNIT |
+		SDHCI_CAN_VDD_330 |
+		SDHCI_CAN_DO_SDMA;
 	return 0;
 }
 
@@ -95,6 +110,14 @@ static const struct sdhci_pci_fixes sdhci_ricoh = {
 			  SDHCI_QUIRK_CLOCK_BEFORE_RESET,
 };
 
+static const struct sdhci_pci_fixes sdhci_ricoh_mmc = {
+	.probe_slot	= ricoh_mmc_probe_slot,
+	.quirks		= SDHCI_QUIRK_32BIT_DMA_ADDR |
+			  SDHCI_QUIRK_CLOCK_BEFORE_RESET |
+			  SDHCI_QUIRK_NO_CARD_NO_RESET |
+			  SDHCI_QUIRK_MISSING_CAPS
+};
+
 static const struct sdhci_pci_fixes sdhci_ene_712 = {
 	.quirks		= SDHCI_QUIRK_SINGLE_POWER_WRITE |
 			  SDHCI_QUIRK_BROKEN_DMA,
@@ -374,6 +397,14 @@ static const struct pci_device_id pci_ids[] __devinitdata = {
 	},
 
 	{
+		.vendor         = PCI_VENDOR_ID_RICOH,
+		.device         = 0x843,
+		.subvendor      = PCI_ANY_ID,
+		.subdevice      = PCI_ANY_ID,
+		.driver_data    = (kernel_ulong_t)&sdhci_ricoh_mmc,
+	},
+
+	{
 		.vendor		= PCI_VENDOR_ID_ENE,
 		.device		= PCI_DEVICE_ID_ENE_CB712_SD,
 		.subvendor	= PCI_ANY_ID,
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c6d1bd8..483b78e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1687,7 +1687,8 @@ int sdhci_add_host(struct sdhci_host *host)
 			host->version);
 	}
 
-	caps = sdhci_readl(host, SDHCI_CAPABILITIES);
+	caps = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
+		sdhci_readl(host, SDHCI_CAPABILITIES);
 
 	if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
 		host->flags |= SDHCI_USE_SDMA;
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index c846813..b1839a3 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -240,6 +240,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN		(1<<25)
 /* Controller cannot support End Attribute in NOP ADMA descriptor */
 #define SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC		(1<<26)
+/* Controller is missing device caps. Use caps provided by host */
+#define SDHCI_QUIRK_MISSING_CAPS			(1<<27)
 
 	int			irq;		/* Device IRQ */
 	void __iomem *		ioaddr;		/* Mapped address */
@@ -292,6 +294,8 @@ struct sdhci_host {
 
 	struct timer_list	timer;		/* Timer for timeouts */
 
+	unsigned int		caps;		/* Alternative capabilities */
+
 	unsigned long		private[0] ____cacheline_aligned;
 };
 
-- 
1.7.0.4

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