mmc: tmio: add eMMC support

We need to add R1 without CRC support, refactor the bus width routine a
little and extend a quirk check. To support "non-removable;" we need a
workaround which will be hopefully removed when reworking PM soon.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/tmio_mmc.h

@@ -79,6 +79,9 @@
 #define	CLK_CTL_DIV_MASK	0xff
 #define	CLK_CTL_SCLKEN		BIT(8)
 
+#define CARD_OPT_WIDTH8		BIT(13)
+#define CARD_OPT_WIDTH		BIT(15)
+
 #define TMIO_BBS		512		/* Boot block size */
 
 /* Definitions for values the CTRL_SDIO_STATUS register can take. */

drivers/mmc/host/tmio_mmc_pio.c

@@ -336,7 +336,9 @@ static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command
 
 	switch (mmc_resp_type(cmd)) {
 	case MMC_RSP_NONE: c |= RESP_NONE; break;
-	case MMC_RSP_R1:   c |= RESP_R1;   break;
+	case MMC_RSP_R1:
+	case MMC_RSP_R1_NO_CRC:
+			   c |= RESP_R1;   break;
 	case MMC_RSP_R1B:  c |= RESP_R1B;  break;
 	case MMC_RSP_R2:   c |= RESP_R2;   break;
 	case MMC_RSP_R3:   c |= RESP_R3;   break;
@@ -730,12 +732,13 @@ static int tmio_mmc_start_data(struct tmio_mmc_host *host,
 	pr_debug("setup data transfer: blocksize %08x  nr_blocks %d\n",
 		 data->blksz, data->blocks);
 
-	/* Some hardware cannot perform 2 byte requests in 4 bit mode */
-	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
+	/* Some hardware cannot perform 2 byte requests in 4/8 bit mode */
+	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4 ||
+	    host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
 		int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
 
 		if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
-			pr_err("%s: %d byte block unsupported in 4 bit mode\n",
+			pr_err("%s: %d byte block unsupported in 4/8 bit mode\n",
 			       mmc_hostname(host->mmc), data->blksz);
 			return -EINVAL;
 		}
@@ -857,14 +860,16 @@ static void tmio_mmc_power_off(struct tmio_mmc_host *host)
 static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host,
 				unsigned char bus_width)
 {
-	switch (bus_width) {
-	case MMC_BUS_WIDTH_1:
-		sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
-		break;
-	case MMC_BUS_WIDTH_4:
-		sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
-		break;
-	}
+	u16 reg = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT)
+				& ~(CARD_OPT_WIDTH | CARD_OPT_WIDTH8);
+
+	/* reg now applies to MMC_BUS_WIDTH_4 */
+	if (bus_width == MMC_BUS_WIDTH_1)
+		reg |= CARD_OPT_WIDTH;
+	else if (bus_width == MMC_BUS_WIDTH_8)
+		reg |= CARD_OPT_WIDTH8;
+
+	sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg);
 }
 
 /* Set MMC clock / power.
@@ -1082,6 +1087,15 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host,
 				  !mmc_card_is_removable(mmc) ||
 				  mmc->slot.cd_irq >= 0);
 
+	/*
+	 * On Gen2+, eMMC with NONREMOVABLE currently fails because native
+	 * hotplug gets disabled. It seems RuntimePM related yet we need further
+	 * research. Since we are planning a PM overhaul anyway, let's enforce
+	 * for now the device being active by enabling native hotplug always.
+	 */
+	if (pdata->flags & TMIO_MMC_MIN_RCAR2)
+		_host->native_hotplug = true;
+
 	if (tmio_mmc_clk_enable(_host) < 0) {
 		mmc->f_max = pdata->hclk;
 		mmc->f_min = mmc->f_max / 512;