ramips: drop obsolete sd card driver code

The pinmux for all SoCs using this driver is now set via the pinmux. It
makes this code obsolete.

Some of the code targeting the mt76x8 SoCs is still required. The sd
card pins share the pads with the EPHY. These pads need to be switched
to digital mode if the pins are used for sd cards.

The eMMC 8-bit mode has to be enabled via pinmux instead of a kernel
option. The uart2 group need to be set to function "sdxc d5 d4", pwm1
to "sdxc d6" and pwm0 to "sdxc d7" to do so. It can't be done by as
part of a default pinmux, as it would break the normal operation of
uart2.

Signed-off-by: Mathias Kresin <[email protected]>

target/linux/ramips/files-4.14/drivers/mmc/host/mtk-mmc/Kconfig

@@ -10,7 +10,3 @@ config MTK_MMC_CD_POLL
 	bool "Card Detect with Polling"
 	depends on MTK_MMC
 
-config MTK_MMC_EMMC_8BIT
-	bool "eMMC 8-bit support"
-	depends on MTK_MMC && RALINK_MT7628
-

target/linux/ramips/files-4.14/drivers/mmc/host/mtk-mmc/sd.c

@@ -2207,27 +2207,15 @@ static int msdc_drv_probe(struct platform_device *pdev)
 	int ret;
 	u32 reg;
 
-	// Set the pins for sdxc to sdxc mode
-	//FIXME: this should be done by pinctl and not by the sd driver
-	if (ralink_soc == MT762X_SOC_MT7620A ||
-	    ralink_soc == MT762X_SOC_MT7621AT) {
-		reg = sdr_read32((void __iomem *)(RALINK_SYSCTL_BASE +
-						  0x60)) & ~(0x3 << 18);
-		if (ralink_soc == MT762X_SOC_MT7620A)
-			reg |= 0x1 << 18;
-	} else {
+	//FIXME: this should be done by pinconf and not by the sd driver
+	if (ralink_soc == MT762X_SOC_MT7688 ||
+	    ralink_soc == MT762X_SOC_MT7628AN) {
+		/* set EPHY pads to digital mode */
 		reg = sdr_read32((void __iomem *)(RALINK_SYSCTL_BASE + 0x3c));
 		reg |= 0x1e << 16;
 		sdr_write32((void __iomem *)(RALINK_SYSCTL_BASE + 0x3c), reg);
-		reg = sdr_read32((void __iomem *)(RALINK_SYSCTL_BASE +
-						  0x60)) & ~(0x3 << 10);
-#if defined(CONFIG_MTK_MMC_EMMC_8BIT)
-		reg |= 0x3 << 26 | 0x3 << 28 | 0x3 << 30;
-#endif
 	}
 
-	sdr_write32((void __iomem *)(RALINK_SYSCTL_BASE + 0x60), reg);
-
 	hw = &msdc0_hw;
 
 	if (of_property_read_bool(pdev->dev.of_node, "mtk,wp-en"))