mmc: sh_sdhi: Fix the ACMD handling

The command handling in this driver is awful, esp. because the driver
depends on command numbers to determine whether this is APPCMD or not.
Also, handling of command RSP response types is totally wrong.

This patch at least plucks out some of the custom command encoding and
fixes the APPCMD handling. The RSP handling still needs work, yet that
might not be needed as it turns out the uniphier-sd.c driver is in much
better shape and supports the same IP, so we might be able to just drop
this driver in favor of the uniphier one.
Signed-off-by: NMarek Vasut <marek.vasut+renesas@gmail.com>
Cc: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: NNobuhiro Iwamatsu <iwamatsu@nigauri.org>

arch/arm/mach-rmobile/include/mach/sh_sdhi.h

@@ -49,11 +49,6 @@
 
 /* SDHI CMD VALUE */
 #define CMD_MASK			0x0000ffff
-#define SDHI_APP			0x0040
-#define SDHI_MMC_SEND_OP_COND		0x0701
-#define SDHI_SD_APP_SEND_SCR		0x0073
-#define SDHI_SD_SWITCH			0x1C06
-#define SDHI_MMC_SEND_EXT_CSD		0x1C08
 
 /* SDHI_PORTSEL */
 #define USE_1PORT			(1 << 8) /* 1 port */

drivers/mmc/sh_sdhi.c

@@ -31,6 +31,7 @@ struct sh_sdhi_host {
 	unsigned char wait_int;
 	unsigned char sd_error;
 	unsigned char detect_waiting;
+	unsigned char app_cmd;
 };
 
 static inline void sh_sdhi_writeq(struct sh_sdhi_host *host, int reg, u64 val)
@@ -475,65 +476,64 @@ static void sh_sdhi_get_response(struct sh_sdhi_host *host, struct mmc_cmd *cmd)
 static unsigned short sh_sdhi_set_cmd(struct sh_sdhi_host *host,
 			struct mmc_data *data, unsigned short opc)
 {
-	switch (opc) {
-	case SD_CMD_APP_SEND_OP_COND:
-	case SD_CMD_APP_SEND_SCR:
-		opc |= SDHI_APP;
-		break;
-	case SD_CMD_APP_SET_BUS_WIDTH:
-		 /* SD_APP_SET_BUS_WIDTH*/
+	if (host->app_cmd) {
 		if (!data)
-			opc |= SDHI_APP;
-		else /* SD_SWITCH */
-			opc = SDHI_SD_SWITCH;
-		break;
-	case MMC_CMD_SEND_OP_COND:
-		opc = SDHI_MMC_SEND_OP_COND;
-		break;
+			host->app_cmd = 0;
+		return opc | BIT(6);
+	}
+
+	switch (opc) {
+	case MMC_CMD_SWITCH:
+		return opc | (data ? 0x1c00 : 0x40);
 	case MMC_CMD_SEND_EXT_CSD:
-		if (data)
-			opc = SDHI_MMC_SEND_EXT_CSD;
-		break;
+		return opc | (data ? 0x1c00 : 0);
+	case MMC_CMD_SEND_OP_COND:
+		return opc | 0x0700;
+	case MMC_CMD_APP_CMD:
+		host->app_cmd = 1;
 	default:
-		break;
+		return opc;
 	}
-	return opc;
 }
 
 static unsigned short sh_sdhi_data_trans(struct sh_sdhi_host *host,
 			struct mmc_data *data, unsigned short opc)
 {
-	unsigned short ret;
-
-	switch (opc) {
-	case MMC_CMD_READ_MULTIPLE_BLOCK:
-		ret = sh_sdhi_multi_read(host, data);
-		break;
-	case MMC_CMD_WRITE_MULTIPLE_BLOCK:
-		ret = sh_sdhi_multi_write(host, data);
-		break;
-	case MMC_CMD_WRITE_SINGLE_BLOCK:
-		ret = sh_sdhi_single_write(host, data);
-		break;
-	case MMC_CMD_READ_SINGLE_BLOCK:
-	case SDHI_SD_APP_SEND_SCR:
-	case SDHI_SD_SWITCH: /* SD_SWITCH */
-	case SDHI_MMC_SEND_EXT_CSD:
-		ret = sh_sdhi_single_read(host, data);
-		break;
-	default:
-		printf(DRIVER_NAME": SD: NOT SUPPORT CMD = d'%04d\n", opc);
-		ret = -EINVAL;
-		break;
+	if (host->app_cmd) {
+		host->app_cmd = 0;
+		switch (opc) {
+		case SD_CMD_APP_SEND_SCR:
+		case SD_CMD_APP_SD_STATUS:
+			return sh_sdhi_single_read(host, data);
+		default:
+			printf(DRIVER_NAME": SD: NOT SUPPORT APP CMD = d'%04d\n",
+				opc);
+			return -EINVAL;
+		}
+	} else {
+		switch (opc) {
+		case MMC_CMD_WRITE_MULTIPLE_BLOCK:
+			return sh_sdhi_multi_write(host, data);
+		case MMC_CMD_READ_MULTIPLE_BLOCK:
+			return sh_sdhi_multi_read(host, data);
+		case MMC_CMD_WRITE_SINGLE_BLOCK:
+			return sh_sdhi_single_write(host, data);
+		case MMC_CMD_READ_SINGLE_BLOCK:
+		case MMC_CMD_SWITCH:
+		case MMC_CMD_SEND_EXT_CSD:;
+			return sh_sdhi_single_read(host, data);
+		default:
+			printf(DRIVER_NAME": SD: NOT SUPPORT CMD = d'%04d\n", opc);
+			return -EINVAL;
+		}
 	}
-	return ret;
 }
 
 static int sh_sdhi_start_cmd(struct sh_sdhi_host *host,
 			struct mmc_data *data, struct mmc_cmd *cmd)
 {
 	long time;
-	unsigned short opc = cmd->cmdidx;
+	unsigned short shcmd, opc = cmd->cmdidx;
 	int ret = 0;
 	unsigned long timeout;
 
@@ -561,7 +561,8 @@ static int sh_sdhi_start_cmd(struct sh_sdhi_host *host,
 		}
 		sh_sdhi_writew(host, SDHI_SIZE, data->blocksize);
 	}
-	opc = sh_sdhi_set_cmd(host, data, opc);
+
+	shcmd = sh_sdhi_set_cmd(host, data, opc);
 
 	/*
 	 *  U-Boot cannot use interrupt.
@@ -592,11 +593,12 @@ static int sh_sdhi_start_cmd(struct sh_sdhi_host *host,
 		       INFO2M_RESP_TIMEOUT | INFO2M_ILA) &
 		       sh_sdhi_readw(host, SDHI_INFO2_MASK));
 
-	sh_sdhi_writew(host, SDHI_CMD, (unsigned short)(opc & CMD_MASK));
-
+	sh_sdhi_writew(host, SDHI_CMD, (unsigned short)(shcmd & CMD_MASK));
 	time = sh_sdhi_wait_interrupt_flag(host);
-	if (!time)
+	if (!time) {
+		host->app_cmd = 0;
 		return sh_sdhi_error_manage(host);
+	}
 
 	if (host->sd_error) {
 		switch (cmd->cmdidx) {
@@ -614,15 +616,20 @@ static int sh_sdhi_start_cmd(struct sh_sdhi_host *host,
 		}
 		host->sd_error = 0;
 		host->wait_int = 0;
+		host->app_cmd = 0;
 		return ret;
 	}
-	if (sh_sdhi_readw(host, SDHI_INFO1) & INFO1_RESP_END)
+
+	if (sh_sdhi_readw(host, SDHI_INFO1) & INFO1_RESP_END) {
+		host->app_cmd = 0;
 		return -EINVAL;
+	}
 
 	if (host->wait_int) {
 		sh_sdhi_get_response(host, cmd);
 		host->wait_int = 0;
 	}
+
 	if (data)
 		ret = sh_sdhi_data_trans(host, data, opc);