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

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Message-Id: <1275527787-3783-1-git-send-email-maximlevitsky@gmail.com>
Date:	Thu,  3 Jun 2010 04:16:27 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Philip Langdale <philipl@...rt.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	adq_dvb@...skialf.net,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: [PATCH] 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'

Signed-off-by: Maxim Levitsky <maximlevitsky@...il.com>
CC: adq_dvb@...skialf.net
CC: linux-mmc@...r.kernel.org <linux-mmc@...r.kernel.org>
---
 drivers/mmc/host/sdhci-pci.c |   34 ++++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci.c     |    5 ++++-
 drivers/mmc/host/sdhci.h     |    2 ++
 3 files changed, 40 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
index 65483fd..3843780 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>
 
@@ -85,6 +86,26 @@ static int ricoh_probe(struct sdhci_pci_chip *chip)
 	    chip->pdev->subsystem_vendor == PCI_VENDOR_ID_SONY)
 		chip->quirks |= SDHCI_QUIRK_NO_CARD_NO_RESET;
 
+	/* To disable hardware races against MMC part */
+	device_disable_async_suspend(&chip->pci_dev->dev);
+	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 ;
+
+	/* To disable hardware races against SDHC part */
+	device_disable_async_suspend(&slot->chip->pci_dev->dev);
 	return 0;
 }
 
@@ -95,6 +116,11 @@ 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_NO_CARD_NO_RESET,
+};
+
 static const struct sdhci_pci_fixes sdhci_ene_712 = {
 	.quirks		= SDHCI_QUIRK_SINGLE_POWER_WRITE |
 			  SDHCI_QUIRK_BROKEN_DMA,
@@ -374,6 +400,14 @@ 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..dbd9367 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1687,7 +1687,10 @@ int sdhci_add_host(struct sdhci_host *host)
 			host->version);
 	}
 
-	caps = sdhci_readl(host, SDHCI_CAPABILITIES);
+	if (host->caps)
+		caps = host->caps;
+	else
+		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..b41581a 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -292,6 +292,8 @@ 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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