Message-Id: <e5aa1338d74504e141ba833b484d588cafb7ab38.1713258948.git.unicorn_wang@outlook.com>
Date: Tue, 16 Apr 2024 17:50:57 +0800
From: Chen Wang <unicornxw@...il.com>
To: adrian.hunter@...el.com,
	aou@...s.berkeley.edu,
	conor+dt@...nel.org,
	guoren@...nel.org,
	inochiama@...look.com,
	jszhang@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	palmer@...belt.com,
	paul.walmsley@...ive.com,
	robh@...nel.org,
	ulf.hansson@...aro.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	chao.wei@...hgo.com,
	haijiao.liu@...hgo.com,
	xiaoguang.xing@...hgo.com,
	tingzhu.wang@...hgo.com
Cc: Chen Wang <unicorn_wang@...look.com>
Subject: [PATCH 2/3] mmc: sdhci-of-dwcmshc: Add support for Sophgo SG2042

From: Chen Wang <unicorn_wang@...look.com>

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 <unicorn_wang@...look.com>
---
 drivers/mmc/host/sdhci-of-dwcmshc.c | 173 ++++++++++++++++++++++++++--
 1 file changed, 166 insertions(+), 7 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
index 1a0b7ded7f9f..432ce0398163 100644
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -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] */
@@ -194,6 +199,11 @@ struct rk35xx_priv {
 	u8 txclk_tapnum;
 };
 
+#define SG2042_MAX_CLKS 2
+struct sg2042_priv {
+	struct clk_bulk_data clks[SG2042_MAX_CLKS];
+};
+
 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 */
+	sdhci_writeb(host, 10, PHY_SDCLKDL_DC_R);
+	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
+	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
+	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
+
+	/* Set SMPLDL_CNFG, Bypass */
+	sdhci_writeb(host, PHY_SMPLDL_CNFG_BYPASS_EN, PHY_SMPLDL_CNFG_R);
+
+	/* Set ATDL_CNFG, tuning clk not use for init */
+	val = FIELD_PREP(PHY_ATDL_CNFG_INPSEL_MASK, 2);
+	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,
@@ -763,6 +853,13 @@ static const struct sdhci_pltfm_data sdhci_dwcmshc_cv18xx_pdata = {
 	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
 };
 
+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,
+	.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)
+{
+	int err;
+	struct sg2042_priv *soc = NULL;
+
+	soc = devm_kzalloc(dev, sizeof(struct sg2042_priv), GFP_KERNEL);
+	if (!soc)
+		return -ENOMEM;
+
+	soc->clks[0].id = "card";
+	soc->clks[1].id = "timer";
+	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);
-- 
2.25.1

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