mmc: fsl_esdhc: Add adapter card type identification support

Add adapter card type identification support by reading
FPGA STAT_PRES1 register SDHC Card ID[0:2] bits. To use this function,
define CONFIG_FSL_ESDHC_ADAPTER_IDENT.

Signed-off-by: Yangbo Lu <yangbo.lu@freescale.com>
Cc: York Sun <yorksun@freescale.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
[York Sun: resolve conflicts in README.fsl-esdhc]
Reviewed-by: York Sun <yorksun@freescale.com>

arch/powerpc/include/asm/global_data.h

@@ -15,6 +15,9 @@
 struct arch_global_data {
 #if defined(CONFIG_FSL_ESDHC)
 	u32 sdhc_clk;
+#if defined(CONFIG_FSL_ESDHC_ADAPTER_IDENT)
+	u8 sdhc_adapter;
+#endif
 #endif
 #if defined(CONFIG_8xx)
 	unsigned long brg_clk;

board/freescale/common/qixis.h

@@ -115,4 +115,18 @@ void qixis_write_i2c(unsigned int reg, u8 value);
 			qixis_write_i2c(offsetof(struct qixis, reg), value)
 #endif
 
+/* Use for SDHC adapter card type identification and operation */
+#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
+#define QIXIS_SDID_MASK                         0x07
+#define QIXIS_ESDHC_ADAPTER_TYPE_EMMC45         0x1	/* eMMC Card Rev4.5 */
+#define QIXIS_ESDHC_ADAPTER_TYPE_SDMMC_LEGACY   0x2	/* SD/MMC Legacy Card */
+#define QIXIS_ESDHC_ADAPTER_TYPE_EMMC44         0x3	/* eMMC Card Rev4.4 */
+#define QIXIS_ESDHC_ADAPTER_TYPE_RSV            0x4	/* Reserved */
+#define QIXIS_ESDHC_ADAPTER_TYPE_MMC            0x5	/* MMC Card */
+#define QIXIS_ESDHC_ADAPTER_TYPE_SD             0x6	/* SD Card Rev2.0 3.0 */
+#define QIXIS_ESDHC_NO_ADAPTER                  0x7	/* No Card is Present*/
+#define QIXIS_SDCLKIN		0x08
+#define QIXIS_SDCLKOUT		0x02
+#endif
+
 #endif

doc/README.fsl-esdhc

@@ -1,6 +1,24 @@
-CONFIG_SYS_FSL_ESDHC_LE means ESDHC IP is in little-endian mode.
-CONFIG_SYS_FSL_ESDHC_BE means ESDHC IP is in big-endian mode.
-CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT forces to run at 1.8V.
+Freescale esdhc-specific options
 
-Accessing ESDHC registers can be determined by ESDHC IP's endian
-mode or processor's endian mode.
+	- CONFIG_FSL_ESDHC_ADAPTER_IDENT
+		Support Freescale adapter card type identification. This is implemented by
+		operating Qixis FPGA relevant registers. The STAT_PRES1 register has SDHC
+		Card ID[0:2] bits showing the type of card installed in the SDHC Adapter Slot.
+
+		SDHC Card ID[0:2]	Adapter Card Type
+		0b000			reserved
+		0b001			eMMC Card Rev4.5
+		0b010			SD/MMC Legacy Card
+		0b011			eMMC Card Rev4.4
+		0b100			reserved
+		0b101			MMC Card
+		0b110			SD Card Rev2.0/3.0
+		0b111			No card is present
+	- CONFIG_SYS_FSL_ESDHC_LE
+		ESDHC IP is in little-endian mode. Accessing ESDHC registers can be
+		determined by ESDHC IP's endian mode or processor's endian mode.
+	- CONFIG_SYS_FSL_ESDHC_BE
+		ESDHC IP is in big-endian mode. Accessing ESDHC registers can be determined
+		by ESDHC IP's endian mode or processor's endian mode.
+
+	- CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT forces to run at 1.8V.

drivers/mmc/fsl_esdhc.c

@@ -694,6 +694,39 @@ int fsl_esdhc_mmc_init(bd_t *bis)
 	return fsl_esdhc_initialize(bis, cfg);
 }
 
+#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
+void mmc_adapter_card_type_ident(void)
+{
+	u8 card_id;
+	u8 value;
+
+	card_id = QIXIS_READ(present) & QIXIS_SDID_MASK;
+	gd->arch.sdhc_adapter = card_id;
+
+	switch (card_id) {
+	case QIXIS_ESDHC_ADAPTER_TYPE_EMMC45:
+		break;
+	case QIXIS_ESDHC_ADAPTER_TYPE_SDMMC_LEGACY:
+		break;
+	case QIXIS_ESDHC_ADAPTER_TYPE_EMMC44:
+		value = QIXIS_READ(brdcfg[5]);
+		value |= (QIXIS_SDCLKIN | QIXIS_SDCLKOUT);
+		QIXIS_WRITE(brdcfg[5], value);
+		break;
+	case QIXIS_ESDHC_ADAPTER_TYPE_RSV:
+		break;
+	case QIXIS_ESDHC_ADAPTER_TYPE_MMC:
+		break;
+	case QIXIS_ESDHC_ADAPTER_TYPE_SD:
+		break;
+	case QIXIS_ESDHC_NO_ADAPTER:
+		break;
+	default:
+		break;
+	}
+}
+#endif
+
 #ifdef CONFIG_OF_LIBFDT
 void fdt_fixup_esdhc(void *blob, bd_t *bd)
 {
@@ -709,7 +742,10 @@ void fdt_fixup_esdhc(void *blob, bd_t *bd)
 
 	do_fixup_by_compat_u32(blob, compat, "clock-frequency",
 			       gd->arch.sdhc_clk, 1);
-
+#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
+	do_fixup_by_compat_u32(blob, compat, "adapter-type",
+			       (u32)(gd->arch.sdhc_adapter), 1);
+#endif
 	do_fixup_by_compat(blob, compat, "status", "okay",
 			   4 + 1, 1);
 }

drivers/mmc/mmc.c

@@ -1588,6 +1588,9 @@ int mmc_start_init(struct mmc *mmc)
 	if (mmc->has_init)
 		return 0;
 
+#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
+	mmc_adapter_card_type_ident();
+#endif
 	board_mmc_power_init();
 
 	/* made sure it's not NULL earlier */
@@ -1739,6 +1742,9 @@ static void do_preinit(void)
 	list_for_each(entry, &mmc_devices) {
 		m = list_entry(entry, struct mmc, link);
 
+#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
+		mmc_set_preinit(m, 1);
+#endif
 		if (m->preinit)
 			mmc_start_init(m);
 	}

drivers/mmc/mmc_private.h

@@ -16,6 +16,9 @@ extern int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 			struct mmc_data *data);
 extern int mmc_send_status(struct mmc *mmc, int timeout);
 extern int mmc_set_blocklen(struct mmc *mmc, int len);
+#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
+void mmc_adapter_card_type_ident(void);
+#endif
 
 #ifndef CONFIG_SPL_BUILD
 

include/fsl_esdhc.h

@@ -16,6 +16,10 @@
 /* needed for the mmc_cfg definition */
 #include <mmc.h>
 
+#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
+#include "../board/freescale/common/qixis.h"
+#endif
+
 /* FSL eSDHC-specific constants */
 #define SYSCTL			0x0002e02c
 #define SYSCTL_INITA		0x08000000