mxs: mmc: Allow overriding default card detect implementation

Some MXS based boards do not implement the card-detect signal. Allow
user to specify alternate card-detect implementation.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>

arch/arm/include/asm/arch-mxs/sys_proto.h

@@ -31,7 +31,7 @@ int mxs_wait_mask_clr(struct mxs_register_32 *reg,
 		       uint32_t mask,
 		       unsigned int timeout);
 
-int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int));
+int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int), int (*cd)(int));
 
 #ifdef CONFIG_SPL_BUILD
 

board/bluegiga/apx4devkit/apx4devkit.c

@@ -69,7 +69,7 @@ int board_init(void)
 #ifdef CONFIG_CMD_MMC
 int board_mmc_init(bd_t *bis)
 {
-	return mxsmmc_initialize(bis, 0, NULL);
+	return mxsmmc_initialize(bis, 0, NULL, NULL);
 }
 #endif
 

board/denx/m28evk/m28evk.c

@@ -93,7 +93,7 @@ int board_mmc_init(bd_t *bis)
 	/* Turn on the power to the card. */
 	gpio_direction_output(MX28_PAD_PWM3__GPIO_3_28, 0);
 
-	return mxsmmc_initialize(bis, 0, m28_mmc_wp);
+	return mxsmmc_initialize(bis, 0, m28_mmc_wp, NULL);
 }
 #endif
 

board/freescale/mx28evk/mx28evk.c

@@ -94,7 +94,7 @@ int board_mmc_init(bd_t *bis)
 	/* Configure MMC0 Power Enable */
 	gpio_direction_output(MX28_PAD_PWM3__GPIO_3_28, 0);
 
-	return mxsmmc_initialize(bis, 0, mx28evk_mmc_wp);
+	return mxsmmc_initialize(bis, 0, mx28evk_mmc_wp, NULL);
 }
 #endif
 

board/schulercontrol/sc_sps_1/sc_sps_1.c

@@ -78,7 +78,7 @@ int dram_init(void)
 #ifdef	CONFIG_CMD_MMC
 int board_mmc_init(bd_t *bis)
 {
-	return mxsmmc_initialize(bis, 0, NULL);
+	return mxsmmc_initialize(bis, 0, NULL, NULL);
 }
 #endif
 

drivers/mmc/mxsmmc.c

@@ -49,12 +49,23 @@ struct mxsmmc_priv {
 	struct mxs_ssp_regs	*regs;
 	uint32_t		buswidth;
 	int			(*mmc_is_wp)(int);
+	int			(*mmc_cd)(int);
 	struct mxs_dma_desc	*desc;
 };
 
 #define	MXSMMC_MAX_TIMEOUT	10000
 #define MXSMMC_SMALL_TRANSFER	512
 
+static int mxsmmc_cd(struct mxsmmc_priv *priv)
+{
+	struct mxs_ssp_regs *ssp_regs = priv->regs;
+
+	if (priv->mmc_cd)
+		return priv->mmc_cd(priv->id);
+
+	return !(readl(&ssp_regs->hw_ssp_status) & SSP_STATUS_CARD_DETECT);
+}
+
 static int mxsmmc_send_cmd_pio(struct mxsmmc_priv *priv, struct mmc_data *data)
 {
 	struct mxs_ssp_regs *ssp_regs = priv->regs;
@@ -166,7 +177,7 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 	}
 
 	/* See if card is present */
-	if (readl(&ssp_regs->hw_ssp_status) & SSP_STATUS_CARD_DETECT) {
+	if (!mxsmmc_cd(priv)) {
 		printf("MMC%d: No card detected!\n", mmc->block_dev.dev);
 		return NO_CARD_ERR;
 	}
@@ -357,7 +368,7 @@ static int mxsmmc_init(struct mmc *mmc)
 	return 0;
 }
 
-int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int))
+int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int), int (*cd)(int))
 {
 	struct mmc *mmc = NULL;
 	struct mxsmmc_priv *priv = NULL;
@@ -395,6 +406,7 @@ int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int))
 		return ret;
 
 	priv->mmc_is_wp = wp;
+	priv->mmc_cd = cd;
 	priv->id = id;
 	priv->regs = mxs_ssp_regs_by_bus(id);