mmc: sdhci-of-dwcmshc: support Sophgo SG2042

From: Chen Wang <[email protected]>

SG2042 use Synopsys dwcnshc IP for SD/eMMC controllers.

SG2042 defines 3 clocks for SD/eMMC controllers.
- AXI_EMMC/AXI_SD for aclk/hclk(Bus interface clocks in DWC_mshc) and blck(Core Base Clock in DWC_mshc), these 3 clocks share one source, so reuse existing "core".
- 100K_EMMC/100K_SD for cqetmclk(Timer clocks in DWC_mshc), so reuse existing "timer" which was added for rockchip specified.
- EMMC_100M/SD_100M for cclk(Card clocks in DWC_mshc), add new "card".

Adding some examples.

Signed-off-by Chen Wang <[email protected]>

---
 .../bindings/mmc/snps,dwcmshc-sdhci.yaml      | 67 ++++++++++++++-----
 1 file changed, 51 insertions(+), 16 deletions(-)

Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml +1 -8

index 4d3031d9965f..a04ccae216cf 100644
@@ -21,6 +21,7 @@ properties:
       - snps,dwcmshc-sdhci
       - sophgo,cv1800b-dwcmshc
       - sophgo,sg2002-dwcmshc
+      - sophgo,sg2042-dwcmshc
       - thead,th1520-dwcmshc
 
   reg:

@@ -30,23 +31,36 @@ properties:
     maxItems: 1
 
   clocks:
-    minItems: 1
-    items:
-      - description: core clock
-      - description: bus clock for optional
-      - description: axi clock for rockchip specified
-      - description: block clock for rockchip specified
-      - description: timer clock for rockchip specified
-

Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml +40 -8

+        items:
+          - description: core clock
+          - description: timer clock
+          - description: card clock
 
   clock-names:
-    minItems: 1
-    items:
-      - const: core
-      - const: bus
-      - const: axi
-      - const: block
-      - const: timer
+    anyOf:
+      - minItems: 1
+        items:
+          - const: core
+          - const: bus
+          - const: axi
+          - const: block
+          - const: timer
+
+      - minItems: 1
+        items:
+          - const: core
+          - const: timer
+          - const: card
 
   resets:
     maxItems: 5

@@ -96,5 +110,26 @@ examples:
       #address-cells = <1>;
       #size-cells = <0>;
     };
-
+  - |
+    mmc@bb0000 {
+      compatible = "snps,dwcmshc-sdhci";
+      reg = <0xbb000 0x1000>;
+      interrupts = <0 25 0x4>;
+      clocks = <&cru 17>;
+      clock-names = "core";
+      bus-width = <8>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+    };
+  - |
+    mmc@cc0000 {
+      compatible = "snps,dwcmshc-sdhci";
+      reg = <0xcc000 0x1000>;
+      interrupts = <0 25 0x4>;
+      clocks = <&cru 17>, <&cru 18>, <&cru 19>;
+      clock-names = "core", "timer", "card";
+      bus-width = <8>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+    };
...

Signature · 1 line

2.25.1

On Tue, Apr 16, 2024 at 05:50:37PM +0800, Chen Wang wrote:

Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml properties: · line 43

Quoted 10 lines

Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml +10 -0

+    anyOf:
+      - minItems: 1
+        items:
+          - description: core clock
+          - description: bus clock for optional
+          - description: axi clock for rockchip specified
+          - description: block clock for rockchip specified
+          - description: timer clock for rockchip specified
+
+      - minItems: 1

I don't think this minItems is needed, this is for one device which has all 3, no?

I also think this combination should only be permitted for the sg2042, since it is not valid for the existing devices.

Cheers,
Conor.

From: Chen Wang <[email protected]>

Add support for the mmc controller of Sophgo SG2042.

SG2042 uses Synopsys PHY the same as TH1520 so we reuse the tuning logic from TH1520. Besides this, this patch implement some SG2042 specific work, such as clocks and reset ops.

Signed-off-by Chen Wang <[email protected]>

---
 drivers/mmc/host/sdhci-of-dwcmshc.c | 173 ++++++++++++++++++++++++++--
 1 file changed, 166 insertions(+), 7 deletions(-)

drivers/mmc/host/sdhci-of-dwcmshc.c +12 -7

index 1a0b7ded7f9f..432ce0398163 100644
@@ -106,12 +106,13 @@
 #define DWC_MSHC_PTR_PHY_R	0x300
 
 /* PHY general configuration */
-#define PHY_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x00)
-#define PHY_CNFG_RSTN_DEASSERT	0x1  /* Deassert PHY reset */
-#define PHY_CNFG_PAD_SP_MASK	GENMASK(19, 16) /* bits [19:16] */
-#define PHY_CNFG_PAD_SP		0x0c /* PMOS TX drive strength */
-#define PHY_CNFG_PAD_SN_MASK	GENMASK(23, 20) /* bits [23:20] */
-#define PHY_CNFG_PAD_SN		0x0c /* NMOS TX drive strength */
+#define PHY_CNFG_R			(DWC_MSHC_PTR_PHY_R + 0x00)
+#define PHY_CNFG_RSTN_DEASSERT		0x1  /* Deassert PHY reset */
+#define PHY_CNFG_PHY_PWRGOOD_MASK	BIT_MASK(1) /* bit [1] */
+#define PHY_CNFG_PAD_SP_MASK		GENMASK(19, 16) /* bits [19:16] */
+#define PHY_CNFG_PAD_SP			0x0c /* PMOS TX drive strength */
+#define PHY_CNFG_PAD_SN_MASK		GENMASK(23, 20) /* bits [23:20] */
+#define PHY_CNFG_PAD_SN			0x0c /* NMOS TX drive strength */
 
 /* PHY command/response pad settings */
 #define PHY_CMDPAD_CNFG_R	(DWC_MSHC_PTR_PHY_R + 0x04)

@@ -143,7 +144,8 @@
 
 /* PHY CLK delay line settings */
 #define PHY_SDCLKDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x1d)
-#define PHY_SDCLKDL_CNFG_UPDATE	BIT(4) /* set before writing to SDCLKDL_DC */
+#define PHY_SDCLKDL_CNFG_EXTDLY_EN	BIT(0)
+#define PHY_SDCLKDL_CNFG_UPDATE		BIT(4) /* set before writing to SDCLKDL_DC */
 
 /* PHY CLK delay line delay code */
 #define PHY_SDCLKDL_DC_R		(DWC_MSHC_PTR_PHY_R + 0x1e)

@@ -151,6 +153,9 @@
 #define PHY_SDCLKDL_DC_DEFAULT		0x32 /* default delay code */
 #define PHY_SDCLKDL_DC_HS400		0x18 /* delay code for HS400 mode */
 
+#define PHY_SMPLDL_CNFG_R		(DWC_MSHC_PTR_PHY_R + 0x20)
+#define PHY_SMPLDL_CNFG_BYPASS_EN	BIT(1)
+
 /* PHY drift_cclk_rx delay line configuration setting */
 #define PHY_ATDL_CNFG_R			(DWC_MSHC_PTR_PHY_R + 0x21)
 #define PHY_ATDL_CNFG_INPSEL_MASK	GENMASK(3, 2) /* bits [3:2] */

drivers/mmc/host/sdhci-of-dwcmshc.c +46 -0

+};
+
 struct dwcmshc_priv {
 	struct clk	*bus_clk;
 	int vendor_specific_area1; /* P_VENDOR_SPECIFIC_AREA reg */

@@ -690,6 +700,76 @@ static void cv18xx_sdhci_reset(struct sdhci_host *host, u8 mask)
 	sdhci_writel(host, val, priv->vendor_specific_area1 + CV18XX_SDHCI_PHY_TX_RX_DLY);
 }
 
+static inline void sg2042_sdhci_phy_init(struct sdhci_host *host)
+{
+	u32 val;
+
+	/* Asset phy reset & set tx drive strength */
+	val = sdhci_readl(host, PHY_CNFG_R);
+	val &= ~PHY_CNFG_RSTN_DEASSERT;
+	val |= FIELD_PREP(PHY_CNFG_PHY_PWRGOOD_MASK, 1);
+	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, 9);
+	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, 8);
+	sdhci_writel(host, val, PHY_CNFG_R);
+
+	/* Configure phy pads */
+	val = PHY_PAD_RXSEL_3V3;
+	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, 3);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, 2);
+	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
+	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
+	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
+
+	val = PHY_PAD_RXSEL_3V3;
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, 3);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, 2);
+	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
+
+	val = PHY_PAD_RXSEL_3V3;
+	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, 3);
+	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, 2);
+	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
+
+	/* Configure delay line */
+	/* Enable fixed delay */
+	sdhci_writeb(host, PHY_SDCLKDL_CNFG_EXTDLY_EN, PHY_SDCLKDL_CNFG_R);
+	/*
+	 * Set delay line.
+	 * Its recommended that bit UPDATE_DC[4] is 1 when SDCLKDL_DC is being written.
+	 * Ensure UPDATE_DC[4] is '0' when not updating code.
+	 */
+	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
+	val |= PHY_SDCLKDL_CNFG_UPDATE;
+	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
+	/* Add 10 * 70ps = 0.7ns for output delay */

drivers/mmc/host/sdhci-of-dwcmshc.c +26 -0

+	sdhci_writeb(host, val, PHY_ATDL_CNFG_R);
+
+	/* Deasset phy reset */
+	val = sdhci_readl(host, PHY_CNFG_R);
+	val |= PHY_CNFG_RSTN_DEASSERT;
+	sdhci_writel(host, val, PHY_CNFG_R);
+}
+
+static void sg2042_sdhci_reset(struct sdhci_host *host, u8 mask)
+{
+	sdhci_reset(host, mask);
+
+	if (mask & SDHCI_RESET_ALL)
+		sg2042_sdhci_phy_init(host);
+}
+
 static const struct sdhci_ops sdhci_dwcmshc_ops = {
 	.set_clock		= sdhci_set_clock,
 	.set_bus_width		= sdhci_set_bus_width,

@@ -728,6 +808,16 @@ static const struct sdhci_ops sdhci_dwcmshc_cv18xx_ops = {
 	.adma_write_desc	= dwcmshc_adma_write_desc,
 };
 
+static const struct sdhci_ops sdhci_dwcmshc_sg2042_ops = {
+	.set_clock              = sdhci_set_clock,
+	.set_bus_width          = sdhci_set_bus_width,
+	.set_uhs_signaling      = dwcmshc_set_uhs_signaling,
+	.get_max_clock		= dwcmshc_get_max_clock,
+	.platform_execute_tuning = th1520_execute_tuning,
+	.reset                  = sg2042_sdhci_reset,
+	.adma_write_desc        = dwcmshc_adma_write_desc,
+};
+
 static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = {
 	.ops = &sdhci_dwcmshc_ops,
 	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,

drivers/mmc/host/sdhci-of-dwcmshc.c +25 -0

+	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
+};
+
 static void dwcmshc_rk35xx_postinit(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
 {
 	/*

@@ -882,6 +979,58 @@ static int dwcmshc_th1520_init(struct device *dev,
 	return 0;
 }
 
+static int dwcmshc_sg2042_clks_enable(struct dwcmshc_priv *dwc_priv)
+{
+	int ret = 0;
+	struct sg2042_priv *soc = dwc_priv->priv;
+
+	if (soc)
+		ret = clk_bulk_prepare_enable(SG2042_MAX_CLKS, soc->clks);
+	return ret;
+}
+
+static void dwcmshc_sg2042_clks_disable(struct dwcmshc_priv *dwc_priv)
+{
+	struct sg2042_priv *soc = dwc_priv->priv;
+
+	if (soc)
+		clk_bulk_disable_unprepare(SG2042_MAX_CLKS,
+					   soc->clks);
+}
+
+static int dwcmshc_sg2042_init(struct device *dev,
+			       struct sdhci_host *host,
+			       struct dwcmshc_priv *dwc_priv)

drivers/mmc/host/sdhci-of-dwcmshc.c +30 -0

+	err = devm_clk_bulk_get_optional(mmc_dev(host->mmc), SG2042_MAX_CLKS,
+					 soc->clks);
+	if (err) {
+		dev_err(mmc_dev(host->mmc), "failed to get clocks %d\n", err);
+		return err;
+	}
+
+	err = clk_bulk_prepare_enable(SG2042_MAX_CLKS, soc->clks);
+	if (err) {
+		dev_err(mmc_dev(host->mmc), "failed to enable clocks %d\n", err);
+		return err;
+	}
+
+	dwc_priv->priv = soc;
+	dwc_priv->soc_clks_enable = dwcmshc_sg2042_clks_enable;
+	dwc_priv->soc_clks_disable = dwcmshc_sg2042_clks_disable;
+
+	return 0;
+}
+
 static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
 	{
 		.compatible = "rockchip,rk3588-dwcmshc",

@@ -907,6 +1056,10 @@ static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
 		.compatible = "thead,th1520-dwcmshc",
 		.data = &sdhci_dwcmshc_th1520_pdata,
 	},
+	{
+		.compatible = "sophgo,sg2042-dwcmshc",
+		.data = &sdhci_dwcmshc_sg2042_pdata,
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids);

@@ -994,6 +1147,12 @@ static int dwcmshc_probe(struct platform_device *pdev)
 			goto err_clk;
 	}
 
+	if (pltfm_data == &sdhci_dwcmshc_sg2042_pdata) {
+		err = dwcmshc_sg2042_init(dev, host, priv);
+		if (err)
+			goto err_clk;
+	}
+
 #ifdef CONFIG_ACPI
 	if (pltfm_data == &sdhci_dwcmshc_bf3_pdata)
 		sdhci_enable_v4_mode(host);

Signature · 1 line

2.25.1

On Tue, Apr 16, 2024 at 05:50:57PM +0800, Chen Wang wrote:

Quoted 2 lines

+#define SG2042_MAX_CLKS 2

I don't think "bulk" is suitable here for max 2 clks, no?

drivers/mmc/host/sdhci-of-dwcmshc.c struct rk35xx_priv { · line 204

Quoted 2 lines

drivers/mmc/host/sdhci-of-dwcmshc.c +2 -0

+struct sg2042_priv {
+	struct clk_bulk_data clks[SG2042_MAX_CLKS];

useless either

drivers/mmc/host/sdhci-of-dwcmshc.c static void cv18xx_sdhci_reset(struct sdhci_host *host, u8 mask) · line 756

Quoted 3 lines

drivers/mmc/host/sdhci-of-dwcmshc.c +3 -0

+
+	/* Set ATDL_CNFG, tuning clk not use for init */
+	val = FIELD_PREP(PHY_ATDL_CNFG_INPSEL_MASK, 2);

magic "2" needs a meaningful macro definition.

drivers/mmc/host/sdhci-of-dwcmshc.c static const struct sdhci_pltfm_data sdhci_dwcmshc_cv18xx_pdata = { · line 859

Quoted 5 lines

drivers/mmc/host/sdhci-of-dwcmshc.c +4 -0

+static const struct sdhci_pltfm_data sdhci_dwcmshc_sg2042_pdata = {
+	.ops = &sdhci_dwcmshc_sg2042_ops,
+	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
+		  SDHCI_QUIRK_INVERTED_WRITE_PROTECT,

is "wp-inverted" property better?

Quoted 7 lines

drivers/mmc/host/sdhci-of-dwcmshc.c +7 -0

+
+static int dwcmshc_sg2042_init(struct device *dev,
+			       struct sdhci_host *host,
+			       struct dwcmshc_priv *dwc_priv)
+{
+	int err;
+	struct sg2042_priv *soc = NULL;

drivers/mmc/host/sdhci-of-dwcmshc.c static int dwcmshc_th1520_init(struct device *dev, · line 1013

Quoted 7 lines

drivers/mmc/host/sdhci-of-dwcmshc.c +7 -0

+
+	soc = devm_kzalloc(dev, sizeof(struct sg2042_priv), GFP_KERNEL);
+	if (!soc)
+		return -ENOMEM;
+
+	soc->clks[0].id = "card";
+	soc->clks[1].id = "timer";

Interesting, only "card" and "timer", so which clk is for clk input of the ip?

SG2042 defines 3 clocks for SD/eMMC controllers.

- AXI_EMMC/AXI_SD for aclk/hclk(Bus interface clocks in DWC_mshc) and bclk(Core Base Clock in DWC_mshc), these 3 clocks share one source, so reuse existing "core".
- 100K_EMMC/100K_SD for cqetmclk(Timer clocks in DWC_mshc), so reuse existing "timer" which was added for rockchip specified.

- EMMC_100M/SD_100M for cclk(Card clocks in DWC_mshc), add new "card".