mmc: Add a SDHCI quirk for boards that have no CD

Some boards have no Card Detect wired.  In that case, set the CD test
bits in the standard interface.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

drivers/mmc/sdhci.c

@@ -381,12 +381,25 @@ int sdhci_init(struct mmc *mmc)
 		}
 	}
 
+	sdhci_set_power(host, fls(mmc->voltages) - 1);
+
+	if (host->quirks & SDHCI_QUIRK_NO_CD) {
+		unsigned int status;
+
+		sdhci_writel(host, SDHCI_CTRL_CD_TEST_INS | SDHCI_CTRL_CD_TEST,
+			SDHCI_HOST_CONTROL);
+
+		status = sdhci_readl(host, SDHCI_PRESENT_STATE);
+		while ((!(status & SDHCI_CARD_PRESENT)) ||
+		    (!(status & SDHCI_CARD_STATE_STABLE)) ||
+		    (!(status & SDHCI_CARD_DETECT_PIN_LEVEL)))
+			status = sdhci_readl(host, SDHCI_PRESENT_STATE);
+	}
+
 	/* Eable all state */
 	sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_ENABLE);
 	sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_SIGNAL_ENABLE);
 
-	sdhci_set_power(host, fls(mmc->voltages) - 1);
-
 	return 0;
 }
 

include/sdhci.h

@@ -76,6 +76,8 @@
 #define  SDHCI_SPACE_AVAILABLE	0x00000400
 #define  SDHCI_DATA_AVAILABLE	0x00000800
 #define  SDHCI_CARD_PRESENT	0x00010000
+#define  SDHCI_CARD_STATE_STABLE	0x00020000
+#define  SDHCI_CARD_DETECT_PIN_LEVEL	0x00040000
 #define  SDHCI_WRITE_PROTECT	0x00080000
 
 #define SDHCI_HOST_CONTROL	0x28
@@ -88,6 +90,8 @@
 #define   SDHCI_CTRL_ADMA32	0x10
 #define   SDHCI_CTRL_ADMA64	0x18
 #define  SDHCI_CTRL_8BITBUS	0x20
+#define  SDHCI_CTRL_CD_TEST_INS	0x40
+#define  SDHCI_CTRL_CD_TEST	0x80
 
 #define SDHCI_POWER_CONTROL	0x29
 #define  SDHCI_POWER_ON		0x01
@@ -219,6 +223,7 @@
 #define SDHCI_QUIRK_BROKEN_R1B		(1 << 2)
 #define SDHCI_QUIRK_NO_HISPD_BIT	(1 << 3)
 #define SDHCI_QUIRK_BROKEN_VOLTAGE	(1 << 4)
+#define SDHCI_QUIRK_NO_CD		(1 << 5)
 
 /* to make gcc happy */
 struct sdhci_host;