mmc: sdhci-of-arasan: Add support for Intel Keem Bay

Intel Keem Bay SoC eMMC/SD/SDIO controller is based on
Arasan SD 3.0 / eMMC 5.1 host controller IP.

However, it does not support 64-bit access as its AXI interface
has 32-bit address ports.

Signed-off-by: Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20200526062758.17642-3-wan.ahmad.zainie.wan.mohamad@intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-of-arasan.c

@@ -75,6 +75,7 @@ struct sdhci_arasan_soc_ctl_field {
  *
  * @baseclkfreq:	Where to find corecfg_baseclkfreq
  * @clockmultiplier:	Where to find corecfg_clockmultiplier
+ * @support64b:		Where to find SUPPORT64B bit
  * @hiword_update:	If true, use HIWORD_UPDATE to access the syscon
  *
  * It's up to the licensee of the Arsan IP block to make these available
@@ -84,6 +85,7 @@ struct sdhci_arasan_soc_ctl_field {
 struct sdhci_arasan_soc_ctl_map {
 	struct sdhci_arasan_soc_ctl_field	baseclkfreq;
 	struct sdhci_arasan_soc_ctl_field	clockmultiplier;
+	struct sdhci_arasan_soc_ctl_field	support64b;
 	bool					hiword_update;
 };
 
@@ -184,6 +186,13 @@ static const struct sdhci_arasan_soc_ctl_map intel_lgm_sdxc_soc_ctl_map = {
 	.hiword_update = false,
 };
 
+static const struct sdhci_arasan_soc_ctl_map intel_keembay_soc_ctl_map = {
+	.baseclkfreq = { .reg = 0x0, .width = 8, .shift = 14 },
+	.clockmultiplier = { .reg = 0x4, .width = 8, .shift = 14 },
+	.support64b = { .reg = 0x4, .width = 1, .shift = 24 },
+	.hiword_update = false,
+};
+
 /**
  * sdhci_arasan_syscon_write - Write to a field in soc_ctl registers
  *
@@ -1113,6 +1122,50 @@ static struct sdhci_arasan_of_data sdhci_arasan_generic_data = {
 	.clk_ops = &arasan_clk_ops,
 };
 
+static const struct sdhci_pltfm_data sdhci_keembay_emmc_pdata = {
+	.ops = &sdhci_arasan_cqe_ops,
+	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
+		SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
+		SDHCI_QUIRK_NO_LED |
+		SDHCI_QUIRK_32BIT_DMA_ADDR |
+		SDHCI_QUIRK_32BIT_DMA_SIZE |
+		SDHCI_QUIRK_32BIT_ADMA_SIZE,
+	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+		SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN |
+		SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 |
+		SDHCI_QUIRK2_STOP_WITH_TC |
+		SDHCI_QUIRK2_BROKEN_64_BIT_DMA,
+};
+
+static const struct sdhci_pltfm_data sdhci_keembay_sd_pdata = {
+	.ops = &sdhci_arasan_ops,
+	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
+		SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
+		SDHCI_QUIRK_NO_LED |
+		SDHCI_QUIRK_32BIT_DMA_ADDR |
+		SDHCI_QUIRK_32BIT_DMA_SIZE |
+		SDHCI_QUIRK_32BIT_ADMA_SIZE,
+	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+		SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN |
+		SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON |
+		SDHCI_QUIRK2_STOP_WITH_TC |
+		SDHCI_QUIRK2_BROKEN_64_BIT_DMA,
+};
+
+static const struct sdhci_pltfm_data sdhci_keembay_sdio_pdata = {
+	.ops = &sdhci_arasan_ops,
+	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
+		SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
+		SDHCI_QUIRK_NO_LED |
+		SDHCI_QUIRK_32BIT_DMA_ADDR |
+		SDHCI_QUIRK_32BIT_DMA_SIZE |
+		SDHCI_QUIRK_32BIT_ADMA_SIZE,
+	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+		SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN |
+		SDHCI_QUIRK2_HOST_OFF_CARD_ON |
+		SDHCI_QUIRK2_BROKEN_64_BIT_DMA,
+};
+
 static struct sdhci_arasan_of_data sdhci_arasan_rk3399_data = {
 	.soc_ctl_map = &rk3399_soc_ctl_map,
 	.pdata = &sdhci_arasan_cqe_pdata,
@@ -1158,6 +1211,21 @@ static struct sdhci_arasan_of_data sdhci_arasan_versal_data = {
 	.clk_ops = &versal_clk_ops,
 };
 
+static struct sdhci_arasan_of_data intel_keembay_emmc_data = {
+	.soc_ctl_map = &intel_keembay_soc_ctl_map,
+	.pdata = &sdhci_keembay_emmc_pdata,
+};
+
+static struct sdhci_arasan_of_data intel_keembay_sd_data = {
+	.soc_ctl_map = &intel_keembay_soc_ctl_map,
+	.pdata = &sdhci_keembay_sd_pdata,
+};
+
+static struct sdhci_arasan_of_data intel_keembay_sdio_data = {
+	.soc_ctl_map = &intel_keembay_soc_ctl_map,
+	.pdata = &sdhci_keembay_sdio_pdata,
+};
+
 static const struct of_device_id sdhci_arasan_of_match[] = {
 	/* SoC-specific compatible strings w/ soc_ctl_map */
 	{
@@ -1172,6 +1240,18 @@ static const struct of_device_id sdhci_arasan_of_match[] = {
 		.compatible = "intel,lgm-sdhci-5.1-sdxc",
 		.data = &intel_lgm_sdxc_data,
 	},
+	{
+		.compatible = "intel,keembay-sdhci-5.1-emmc",
+		.data = &intel_keembay_emmc_data,
+	},
+	{
+		.compatible = "intel,keembay-sdhci-5.1-sd",
+		.data = &intel_keembay_sd_data,
+	},
+	{
+		.compatible = "intel,keembay-sdhci-5.1-sdio",
+		.data = &intel_keembay_sdio_data,
+	},
 	/* Generic compatible below here */
 	{
 		.compatible = "arasan,sdhci-8.9a",
@@ -1315,6 +1395,40 @@ static void sdhci_arasan_unregister_sdclk(struct device *dev)
 	of_clk_del_provider(dev->of_node);
 }
 
+/**
+ * sdhci_arasan_update_support64b - Set SUPPORT_64B (64-bit System Bus Support)
+ *
+ * This should be set based on the System Address Bus.
+ * 0: the Core supports only 32-bit System Address Bus.
+ * 1: the Core supports 64-bit System Address Bus.
+ *
+ * NOTES:
+ * - For Keem Bay, it is required to clear this bit. Its default value is 1'b1.
+ *   Keem Bay does not support 64-bit access.
+ *
+ * @host		The sdhci_host
+ */
+static void sdhci_arasan_update_support64b(struct sdhci_host *host, u32 value)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
+	const struct sdhci_arasan_soc_ctl_map *soc_ctl_map =
+		sdhci_arasan->soc_ctl_map;
+
+	/* Having a map is optional */
+	if (!soc_ctl_map)
+		return;
+
+	/* If we have a map, we expect to have a syscon */
+	if (!sdhci_arasan->soc_ctl_base) {
+		pr_warn("%s: Have regmap, but no soc-ctl-syscon\n",
+			mmc_hostname(host->mmc));
+		return;
+	}
+
+	sdhci_arasan_syscon_write(host, &soc_ctl_map->support64b, value);
+}
+
 /**
  * sdhci_arasan_register_sdclk - Register the sdcardclk for a PHY to use
  *
@@ -1487,6 +1601,15 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 				    "rockchip,rk3399-sdhci-5.1"))
 		sdhci_arasan_update_clockmultiplier(host, 0x0);
 
+	if (of_device_is_compatible(np, "intel,keembay-sdhci-5.1-emmc") ||
+	    of_device_is_compatible(np, "intel,keembay-sdhci-5.1-sd") ||
+	    of_device_is_compatible(np, "intel,keembay-sdhci-5.1-sdio")) {
+		sdhci_arasan_update_clockmultiplier(host, 0x0);
+		sdhci_arasan_update_support64b(host, 0x0);
+
+		host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
+	}
+
 	sdhci_arasan_update_baseclkfreq(host);
 
 	ret = sdhci_arasan_register_sdclk(sdhci_arasan, clk_xin, &pdev->dev);