diff mbox series

[v6,04/10] PCI: imx6: Introduce SoC specific callbacks for controlling REFCLK

Message ID 20240617-pci2_upstream-v6-4-e0821238f997@nxp.com (mailing list archive)
State Superseded
Headers show
Series PCI: imx6: Fix\rename\clean up and add lut information for imx95 | expand

Commit Message

Frank Li June 17, 2024, 8:16 p.m. UTC 
Instead of using the switch case statement to enable/disable the reference
clock handled by this driver itself, let's introduce a new callback
set_ref_clk() and define it for platforms that require it. This simplifies
the code.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 112 ++++++++++++++++------------------
 1 file changed, 52 insertions(+), 60 deletions(-)

Comments

Manivannan Sadhasivam June 30, 2024, 4:04 p.m. UTC | #1 
On Mon, Jun 17, 2024 at 04:16:40PM -0400, Frank Li wrote:
> Instead of using the switch case statement to enable/disable the reference
> clock handled by this driver itself, let's introduce a new callback
> set_ref_clk() and define it for platforms that require it. This simplifies

Should this be called 'enable_ref_clk' since the callback is supposed to enable
REFCLK?

> the code.
> 
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 112 ++++++++++++++++------------------
>  1 file changed, 52 insertions(+), 60 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 47134e2dfecf2..ff9d0098294fa 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -103,6 +103,7 @@ struct imx_pcie_drvdata {
>  	const u32 mode_mask[IMX_PCIE_MAX_INSTANCES];
>  	const struct pci_epc_features *epc_features;
>  	int (*init_phy)(struct imx_pcie *pcie);
> +	int (*set_ref_clk)(struct imx_pcie *pcie, bool enable);
>  };
>  
>  struct imx_pcie {
> @@ -585,21 +586,19 @@ static int imx_pcie_attach_pd(struct device *dev)
>  	return 0;
>  }
>  
> -static int imx_pcie_enable_ref_clk(struct imx_pcie *imx_pcie)
> +static int imx6sx_pcie_set_ref_clk(struct imx_pcie *imx_pcie, bool enable)
>  {
> -	unsigned int offset;
> -	int ret = 0;
> +	regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> +			   enable ? 0 : IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
>  
> -	switch (imx_pcie->drvdata->variant) {
> -	case IMX6SX:
> -		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
> -				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> -		break;
> -	case IMX6QP:
> -	case IMX6Q:
> +	return 0;
> +}
> +
> +static int imx6q_pcie_set_ref_clk(struct imx_pcie *imx_pcie, bool enable)
> +{
> +	if (enable) {
>  		/* power up core phy and enable ref clock */
> -		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -				   IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> +		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1, IMX6Q_GPR1_PCIE_TEST_PD, 0);
>  		/*
>  		 * the async reset input need ref clock to sync internally,
>  		 * when the ref clock comes after reset, internal synced
> @@ -608,54 +607,34 @@ static int imx_pcie_enable_ref_clk(struct imx_pcie *imx_pcie)
>  		 */
>  		usleep_range(10, 100);
>  		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> -		break;
> -	case IMX7D:
> -	case IMX95:
> -	case IMX95_EP:
> -		break;
> -	case IMX8MM:
> -	case IMX8MM_EP:
> -	case IMX8MQ:
> -	case IMX8MQ_EP:
> -	case IMX8MP:
> -	case IMX8MP_EP:
> -		offset = imx_pcie_grp_offset(imx_pcie);
> -		/*
> -		 * Set the over ride low and enabled
> -		 * make sure that REF_CLK is turned on.
> -		 */
> -		regmap_update_bits(imx_pcie->iomuxc_gpr, offset,
> -				   IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE,
> -				   0);
> -		regmap_update_bits(imx_pcie->iomuxc_gpr, offset,
> -				   IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
> -				   IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN);
> -		break;
> +				   IMX6Q_GPR1_PCIE_REF_CLK_EN, IMX6Q_GPR1_PCIE_REF_CLK_EN);
> +	} else {
> +		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
> +		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +				   IMX6Q_GPR1_PCIE_TEST_PD, IMX6Q_GPR1_PCIE_TEST_PD);
>  	}
>  
> -	return ret;
> +	return 0;
>  }
>  
> -static void imx_pcie_disable_ref_clk(struct imx_pcie *imx_pcie)
> +static int imx8mm_pcie_set_ref_clk(struct imx_pcie *imx_pcie, bool enable)
>  {
> -	switch (imx_pcie->drvdata->variant) {
> -	case IMX6QP:
> -	case IMX6Q:
> -		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -				IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
> -		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -				IMX6Q_GPR1_PCIE_TEST_PD,
> -				IMX6Q_GPR1_PCIE_TEST_PD);
> -		break;
> -	case IMX7D:
> -		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
> -				   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
> -				   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
> -		break;
> -	default:
> -		break;
> -	}
> +	int offset = imx_pcie_grp_offset(imx_pcie);
> +
> +	/* Set the over ride low and enabled make sure that REF_CLK is turned on.*/

This comment provides no useful info. So please remove it.

> +	regmap_update_bits(imx_pcie->iomuxc_gpr, offset, IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE,
> +			   enable ? 0 : IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE);
> +	regmap_update_bits(imx_pcie->iomuxc_gpr, offset, IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
> +			   enable ? IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN : 0);
> +	return 0;
> +}
> +
> +static int imx7d_pcie_set_ref_clk(struct imx_pcie *imx_pcie, bool enable)
> +{
> +	regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
> +			    enable ? 0 : IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
> +	return 0;

Previously imx6_pcie_enable_ref_clk() was bailing out for IMX7D. But now you are
explicitly enabling it. What is the reason?

- Mani
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 47134e2dfecf2..ff9d0098294fa 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -103,6 +103,7 @@  struct imx_pcie_drvdata {
 	const u32 mode_mask[IMX_PCIE_MAX_INSTANCES];
 	const struct pci_epc_features *epc_features;
 	int (*init_phy)(struct imx_pcie *pcie);
+	int (*set_ref_clk)(struct imx_pcie *pcie, bool enable);
 };
 
 struct imx_pcie {
@@ -585,21 +586,19 @@  static int imx_pcie_attach_pd(struct device *dev)
 	return 0;
 }
 
-static int imx_pcie_enable_ref_clk(struct imx_pcie *imx_pcie)
+static int imx6sx_pcie_set_ref_clk(struct imx_pcie *imx_pcie, bool enable)
 {
-	unsigned int offset;
-	int ret = 0;
+	regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
+			   enable ? 0 : IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
 
-	switch (imx_pcie->drvdata->variant) {
-	case IMX6SX:
-		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
-				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
-		break;
-	case IMX6QP:
-	case IMX6Q:
+	return 0;
+}
+
+static int imx6q_pcie_set_ref_clk(struct imx_pcie *imx_pcie, bool enable)
+{
+	if (enable) {
 		/* power up core phy and enable ref clock */
-		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
-				   IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
+		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1, IMX6Q_GPR1_PCIE_TEST_PD, 0);
 		/*
 		 * the async reset input need ref clock to sync internally,
 		 * when the ref clock comes after reset, internal synced
@@ -608,54 +607,34 @@  static int imx_pcie_enable_ref_clk(struct imx_pcie *imx_pcie)
 		 */
 		usleep_range(10, 100);
 		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
-				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
-		break;
-	case IMX7D:
-	case IMX95:
-	case IMX95_EP:
-		break;
-	case IMX8MM:
-	case IMX8MM_EP:
-	case IMX8MQ:
-	case IMX8MQ_EP:
-	case IMX8MP:
-	case IMX8MP_EP:
-		offset = imx_pcie_grp_offset(imx_pcie);
-		/*
-		 * Set the over ride low and enabled
-		 * make sure that REF_CLK is turned on.
-		 */
-		regmap_update_bits(imx_pcie->iomuxc_gpr, offset,
-				   IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE,
-				   0);
-		regmap_update_bits(imx_pcie->iomuxc_gpr, offset,
-				   IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
-				   IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN);
-		break;
+				   IMX6Q_GPR1_PCIE_REF_CLK_EN, IMX6Q_GPR1_PCIE_REF_CLK_EN);
+	} else {
+		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
+				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
+		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
+				   IMX6Q_GPR1_PCIE_TEST_PD, IMX6Q_GPR1_PCIE_TEST_PD);
 	}
 
-	return ret;
+	return 0;
 }
 
-static void imx_pcie_disable_ref_clk(struct imx_pcie *imx_pcie)
+static int imx8mm_pcie_set_ref_clk(struct imx_pcie *imx_pcie, bool enable)
 {
-	switch (imx_pcie->drvdata->variant) {
-	case IMX6QP:
-	case IMX6Q:
-		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
-				IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
-		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR1,
-				IMX6Q_GPR1_PCIE_TEST_PD,
-				IMX6Q_GPR1_PCIE_TEST_PD);
-		break;
-	case IMX7D:
-		regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
-				   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
-				   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
-		break;
-	default:
-		break;
-	}
+	int offset = imx_pcie_grp_offset(imx_pcie);
+
+	/* Set the over ride low and enabled make sure that REF_CLK is turned on.*/
+	regmap_update_bits(imx_pcie->iomuxc_gpr, offset, IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE,
+			   enable ? 0 : IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE);
+	regmap_update_bits(imx_pcie->iomuxc_gpr, offset, IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
+			   enable ? IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN : 0);
+	return 0;
+}
+
+static int imx7d_pcie_set_ref_clk(struct imx_pcie *imx_pcie, bool enable)
+{
+	regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
+			    enable ? 0 : IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
+	return 0;
 }
 
 static int imx_pcie_clk_enable(struct imx_pcie *imx_pcie)
@@ -668,10 +647,12 @@  static int imx_pcie_clk_enable(struct imx_pcie *imx_pcie)
 	if (ret)
 		return ret;
 
-	ret = imx_pcie_enable_ref_clk(imx_pcie);
-	if (ret) {
-		dev_err(dev, "unable to enable pcie ref clock\n");
-		goto err_ref_clk;
+	if (imx_pcie->drvdata->set_ref_clk) {
+		ret = imx_pcie->drvdata->set_ref_clk(imx_pcie, true);
+		if (ret) {
+			dev_err(dev, "Failed to enable PCIe REFCLK\n");
+			goto err_ref_clk;
+		}
 	}
 
 	/* allow the clocks to stabilize */
@@ -686,7 +667,8 @@  static int imx_pcie_clk_enable(struct imx_pcie *imx_pcie)
 
 static void imx_pcie_clk_disable(struct imx_pcie *imx_pcie)
 {
-	imx_pcie_disable_ref_clk(imx_pcie);
+	if (imx_pcie->drvdata->set_ref_clk)
+		imx_pcie->drvdata->set_ref_clk(imx_pcie, false);
 	clk_bulk_disable_unprepare(imx_pcie->drvdata->clks_cnt, imx_pcie->clks);
 }
 
@@ -1475,6 +1457,7 @@  static const struct imx_pcie_drvdata drvdata[] = {
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
 		.init_phy = imx_pcie_init_phy,
+		.set_ref_clk = imx6q_pcie_set_ref_clk,
 	},
 	[IMX6SX] = {
 		.variant = IMX6SX,
@@ -1489,6 +1472,7 @@  static const struct imx_pcie_drvdata drvdata[] = {
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
 		.init_phy = imx6sx_pcie_init_phy,
+		.set_ref_clk = imx6sx_pcie_set_ref_clk,
 	},
 	[IMX6QP] = {
 		.variant = IMX6QP,
@@ -1504,6 +1488,7 @@  static const struct imx_pcie_drvdata drvdata[] = {
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
 		.init_phy = imx_pcie_init_phy,
+		.set_ref_clk = imx6q_pcie_set_ref_clk,
 	},
 	[IMX7D] = {
 		.variant = IMX7D,
@@ -1516,6 +1501,7 @@  static const struct imx_pcie_drvdata drvdata[] = {
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
 		.init_phy = imx7d_pcie_init_phy,
+		.set_ref_clk = imx7d_pcie_set_ref_clk,
 	},
 	[IMX8MQ] = {
 		.variant = IMX8MQ,
@@ -1529,6 +1515,7 @@  static const struct imx_pcie_drvdata drvdata[] = {
 		.mode_off[1] = IOMUXC_GPR12,
 		.mode_mask[1] = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
 		.init_phy = imx8mq_pcie_init_phy,
+		.set_ref_clk = imx8mm_pcie_set_ref_clk,
 	},
 	[IMX8MM] = {
 		.variant = IMX8MM,
@@ -1540,6 +1527,7 @@  static const struct imx_pcie_drvdata drvdata[] = {
 		.clks_cnt = ARRAY_SIZE(imx8mm_clks),
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
+		.set_ref_clk = imx8mm_pcie_set_ref_clk,
 	},
 	[IMX8MP] = {
 		.variant = IMX8MP,
@@ -1551,6 +1539,7 @@  static const struct imx_pcie_drvdata drvdata[] = {
 		.clks_cnt = ARRAY_SIZE(imx8mm_clks),
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
+		.set_ref_clk = imx8mm_pcie_set_ref_clk,
 	},
 	[IMX95] = {
 		.variant = IMX95,
@@ -1577,6 +1566,7 @@  static const struct imx_pcie_drvdata drvdata[] = {
 		.mode_mask[1] = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
 		.epc_features = &imx8m_pcie_epc_features,
 		.init_phy = imx8mq_pcie_init_phy,
+		.set_ref_clk = imx8mm_pcie_set_ref_clk,
 	},
 	[IMX8MM_EP] = {
 		.variant = IMX8MM_EP,
@@ -1589,6 +1579,7 @@  static const struct imx_pcie_drvdata drvdata[] = {
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
 		.epc_features = &imx8m_pcie_epc_features,
+		.set_ref_clk = imx8mm_pcie_set_ref_clk,
 	},
 	[IMX8MP_EP] = {
 		.variant = IMX8MP_EP,
@@ -1601,6 +1592,7 @@  static const struct imx_pcie_drvdata drvdata[] = {
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
 		.epc_features = &imx8m_pcie_epc_features,
+		.set_ref_clk = imx8mm_pcie_set_ref_clk,
 	},
 	[IMX95_EP] = {
 		.variant = IMX95_EP,