[PATCH v3 0/2] Add PCIe driver support for imx6sx

[PATCH v3 0/2] Add PCIe driver support for imx6sx

[Christoph Fritz]

v3:
 * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
v2:
 * leave out regulator handling from driver, will be done later
   in PM subsystem 
 * use BIT() macro for MFD

Christoph Fritz (2):
  MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
  PCI: imx6: add initial imx6sx support

 .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
 drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
 include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
 3 files changed, 101 insertions(+), 40 deletions(-)

-- 
2.1.4

[PATCH v3 0/2] Add PCIe driver support for imx6sx

[Christoph Fritz]

v3:
 * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
v2:
 * leave out regulator handling from driver, will be done later
   in PM subsystem 
 * use BIT() macro for MFD

Christoph Fritz (2):
  MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
  PCI: imx6: add initial imx6sx support

 .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
 drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
 include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
 3 files changed, 101 insertions(+), 40 deletions(-)

-- 
2.1.4

[PATCH v3 1/2] MFD: imx6sx: Add PCIe register definitions for iomuxc gpr

[Christoph Fritz]

This patch adds macros to define masks and bits for imx6sx
PCIe registers. This is based on a patch by Richard Zhu.

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
---
 include/linux/mfd/syscon/imx6q-iomuxc-gpr.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
index 558a485..238c8db 100644
--- a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
+++ b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
@@ -422,6 +422,7 @@
 #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_MASK		(0x1 << 26)
 #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_ENABLE	(0x1 << 26)
 #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_DISABLE	(0x0 << 26)
+#define IMX6SX_GPR5_PCIE_BTNRST_RESET			BIT(19)
 #define IMX6SX_GPR5_CSI1_MUX_CTRL_MASK			(0x3 << 4)
 #define IMX6SX_GPR5_CSI1_MUX_CTRL_EXT_PIN		(0x0 << 4)
 #define IMX6SX_GPR5_CSI1_MUX_CTRL_CVD			(0x1 << 4)
@@ -435,6 +436,10 @@
 #define IMX6SX_GPR5_DISP_MUX_DCIC1_LVDS			(0x1 << 1)
 #define IMX6SX_GPR5_DISP_MUX_DCIC1_MASK			(0x1 << 1)
 
+#define IMX6SX_GPR12_PCIE_TEST_POWERDOWN		BIT(30)
+#define IMX6SX_GPR12_PCIE_RX_EQ_MASK			(0x7 << 0)
+#define IMX6SX_GPR12_PCIE_RX_EQ_2			(0x2 << 0)
+
 /* For imx6ul iomux gpr register field define */
 #define IMX6UL_GPR1_ENET1_CLK_DIR		(0x1 << 17)
 #define IMX6UL_GPR1_ENET2_CLK_DIR		(0x1 << 18)
-- 
2.1.4

[PATCH v3 1/2] MFD: imx6sx: Add PCIe register definitions for iomuxc gpr

[Christoph Fritz]

This patch adds macros to define masks and bits for imx6sx
PCIe registers. This is based on a patch by Richard Zhu.

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
---
 include/linux/mfd/syscon/imx6q-iomuxc-gpr.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
index 558a485..238c8db 100644
--- a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
+++ b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
@@ -422,6 +422,7 @@
 #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_MASK		(0x1 << 26)
 #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_ENABLE	(0x1 << 26)
 #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_DISABLE	(0x0 << 26)
+#define IMX6SX_GPR5_PCIE_BTNRST_RESET			BIT(19)
 #define IMX6SX_GPR5_CSI1_MUX_CTRL_MASK			(0x3 << 4)
 #define IMX6SX_GPR5_CSI1_MUX_CTRL_EXT_PIN		(0x0 << 4)
 #define IMX6SX_GPR5_CSI1_MUX_CTRL_CVD			(0x1 << 4)
@@ -435,6 +436,10 @@
 #define IMX6SX_GPR5_DISP_MUX_DCIC1_LVDS			(0x1 << 1)
 #define IMX6SX_GPR5_DISP_MUX_DCIC1_MASK			(0x1 << 1)
 
+#define IMX6SX_GPR12_PCIE_TEST_POWERDOWN		BIT(30)
+#define IMX6SX_GPR12_PCIE_RX_EQ_MASK			(0x7 << 0)
+#define IMX6SX_GPR12_PCIE_RX_EQ_2			(0x2 << 0)
+
 /* For imx6ul iomux gpr register field define */
 #define IMX6UL_GPR1_ENET1_CLK_DIR		(0x1 << 17)
 #define IMX6UL_GPR1_ENET2_CLK_DIR		(0x1 << 18)
-- 
2.1.4

[PATCH v3 2/2] PCI: imx6: add initial imx6sx support

[Christoph Fritz]

This patch adds initial PCIe support for the imx6 SoC derivate imx6sx.
PCI_MSI support is untested as its necessary suspend/resume quirk is
left out of this patch.
This patch is heavily based on patches by Richard Zhu.

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
---
 .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
 drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
 2 files changed, 96 insertions(+), 40 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index 6fbba53..c4323be 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -4,7 +4,7 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
 and thus inherits all the common properties defined in designware-pcie.txt.
 
 Required properties:
-- compatible: "fsl,imx6q-pcie"
+- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
 - reg: base addresse and length of the pcie controller
 - interrupts: A list of interrupt outputs of the controller. Must contain an
   entry for each entry in the interrupt-names property.
@@ -13,6 +13,10 @@ Required properties:
 - clock-names: Must include the following additional entries:
 	- "pcie_phy"
 
+Additional required properties for imx6sx-pcie:
+- clock names: Must include the following additional entries:
+	- "pcie_inbound_axi"
+
 Example:
 
 	pcie@0x01000000 {
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index fe60096..7e634a6 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -35,9 +35,11 @@ struct imx6_pcie {
 	struct gpio_desc	*reset_gpio;
 	struct clk		*pcie_bus;
 	struct clk		*pcie_phy;
+	struct clk		*pcie_inbound_axi;
 	struct clk		*pcie;
 	struct pcie_port	pp;
 	struct regmap		*iomuxc_gpr;
+	bool			is_imx6sx;
 	void __iomem		*mem_base;
 };
 
@@ -214,35 +216,46 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 	u32 val, gpr1, gpr12;
 
-	/*
-	 * If the bootloader already enabled the link we need some special
-	 * handling to get the core back into a state where it is safe to
-	 * touch it for configuration.  As there is no dedicated reset signal
-	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
-	 * state before completely disabling LTSSM, which is a prerequisite
-	 * for core configuration.
-	 *
-	 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
-	 * indication that the bootloader activated the link.
-	 */
-	regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
-	regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
-
-	if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
-	    (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
-		val = readl(pp->dbi_base + PCIE_PL_PFLR);
-		val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
-		val |= PCIE_PL_PFLR_FORCE_LINK;
-		writel(val, pp->dbi_base + PCIE_PL_PFLR);
-
+	if (imx6_pcie->is_imx6sx) {
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
-				IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
-	}
+				IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
+				IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
+		/* Force PCIe PHY reset */
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+					IMX6SX_GPR5_PCIE_BTNRST_RESET,
+					IMX6SX_GPR5_PCIE_BTNRST_RESET);
+	} else {
+		/*
+		 * If the bootloader already enabled the link we need some
+		 * special handling to get the core back into a state where
+		 * it is safe to touch it for configuration.  As there is no
+		 * dedicated reset signal to manually force LTSSM into "detect"
+		 * state before completely disabling LTSSM, which is a
+		 * prerequisite for core configuration.
+		 *
+		 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have
+		 * a strong indication that the bootloader activated the link.
+		 */
+		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
+		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
+
+		if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
+				(gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
+			val = readl(pp->dbi_base + PCIE_PL_PFLR);
+			val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
+			val |= PCIE_PL_PFLR_FORCE_LINK;
+			writel(val, pp->dbi_base + PCIE_PL_PFLR);
+
+			regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				IMX6Q_GPR12_PCIE_CTL_2, 0);
+		}
 
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_TEST_PD,
+			IMX6Q_GPR1_PCIE_TEST_PD);
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
+	}
 
 	return 0;
 }
@@ -270,18 +283,30 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		goto err_pcie;
 	}
 
-	/* power up core phy and enable ref clock */
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
-	/*
-	 * the async reset input need ref clock to sync internally,
-	 * when the ref clock comes after reset, internal synced
-	 * reset time is too short, cannot meet the requirement.
-	 * add one ~10us delay here.
-	 */
-	udelay(10);
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+	if (imx6_pcie->is_imx6sx) {
+		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
+		if (ret) {
+			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
+			goto err_inbound_axi;
+		}
+
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+			IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
+	} else {
+		/* power up core phy and enable ref clock */
+		regmap_update_bits(imx6_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
+		 * reset time is too short , cannot meet the requirement.
+		 * add one ~10us delay here.
+		 */
+		udelay(10);
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_REF_CLK_EN,
+			IMX6Q_GPR1_PCIE_REF_CLK_EN);
+	}
 
 	/* allow the clocks to stabilize */
 	usleep_range(200, 500);
@@ -292,8 +317,15 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		msleep(100);
 		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
 	}
+
+	if (imx6_pcie->is_imx6sx)
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+			IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
+
 	return 0;
 
+err_inbound_axi:
+	clk_disable_unprepare(imx6_pcie->pcie);
 err_pcie:
 	clk_disable_unprepare(imx6_pcie->pcie_bus);
 err_pcie_bus:
@@ -307,6 +339,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
 {
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 
+	if (imx6_pcie->is_imx6sx) {
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+			IMX6SX_GPR12_PCIE_RX_EQ_MASK,
+			IMX6SX_GPR12_PCIE_RX_EQ_2);
+	}
+
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
 
@@ -571,6 +609,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 	pp = &imx6_pcie->pp;
 	pp->dev = &pdev->dev;
 
+	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
+					"fsl,imx6sx-pcie");
+
 	/* Added for PCI abort handling */
 	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
 		"imprecise external abort");
@@ -606,6 +647,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(imx6_pcie->pcie);
 	}
 
+	if (imx6_pcie->is_imx6sx) {
+		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
+			"pcie_inbound_axi");
+		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
+			dev_err(&pdev->dev,
+				"pcie_incbound_axi clock missing or invalid\n");
+			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
+		}
+	}
+
 	/* Grab GPR config register range */
 	imx6_pcie->iomuxc_gpr =
 		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
@@ -632,6 +683,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
 
 static const struct of_device_id imx6_pcie_of_match[] = {
 	{ .compatible = "fsl,imx6q-pcie", },
+	{ .compatible = "fsl,imx6sx-pcie", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
-- 
2.1.4

[PATCH v3 2/2] PCI: imx6: add initial imx6sx support

[Christoph Fritz]

This patch adds initial PCIe support for the imx6 SoC derivate imx6sx.
PCI_MSI support is untested as its necessary suspend/resume quirk is
left out of this patch.
This patch is heavily based on patches by Richard Zhu.

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
---
 .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
 drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
 2 files changed, 96 insertions(+), 40 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index 6fbba53..c4323be 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -4,7 +4,7 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
 and thus inherits all the common properties defined in designware-pcie.txt.
 
 Required properties:
-- compatible: "fsl,imx6q-pcie"
+- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
 - reg: base addresse and length of the pcie controller
 - interrupts: A list of interrupt outputs of the controller. Must contain an
   entry for each entry in the interrupt-names property.
@@ -13,6 +13,10 @@ Required properties:
 - clock-names: Must include the following additional entries:
 	- "pcie_phy"
 
+Additional required properties for imx6sx-pcie:
+- clock names: Must include the following additional entries:
+	- "pcie_inbound_axi"
+
 Example:
 
 	pcie at 0x01000000 {
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index fe60096..7e634a6 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -35,9 +35,11 @@ struct imx6_pcie {
 	struct gpio_desc	*reset_gpio;
 	struct clk		*pcie_bus;
 	struct clk		*pcie_phy;
+	struct clk		*pcie_inbound_axi;
 	struct clk		*pcie;
 	struct pcie_port	pp;
 	struct regmap		*iomuxc_gpr;
+	bool			is_imx6sx;
 	void __iomem		*mem_base;
 };
 
@@ -214,35 +216,46 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 	u32 val, gpr1, gpr12;
 
-	/*
-	 * If the bootloader already enabled the link we need some special
-	 * handling to get the core back into a state where it is safe to
-	 * touch it for configuration.  As there is no dedicated reset signal
-	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
-	 * state before completely disabling LTSSM, which is a prerequisite
-	 * for core configuration.
-	 *
-	 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
-	 * indication that the bootloader activated the link.
-	 */
-	regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
-	regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
-
-	if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
-	    (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
-		val = readl(pp->dbi_base + PCIE_PL_PFLR);
-		val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
-		val |= PCIE_PL_PFLR_FORCE_LINK;
-		writel(val, pp->dbi_base + PCIE_PL_PFLR);
-
+	if (imx6_pcie->is_imx6sx) {
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
-				IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
-	}
+				IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
+				IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
+		/* Force PCIe PHY reset */
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+					IMX6SX_GPR5_PCIE_BTNRST_RESET,
+					IMX6SX_GPR5_PCIE_BTNRST_RESET);
+	} else {
+		/*
+		 * If the bootloader already enabled the link we need some
+		 * special handling to get the core back into a state where
+		 * it is safe to touch it for configuration.  As there is no
+		 * dedicated reset signal to manually force LTSSM into "detect"
+		 * state before completely disabling LTSSM, which is a
+		 * prerequisite for core configuration.
+		 *
+		 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have
+		 * a strong indication that the bootloader activated the link.
+		 */
+		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
+		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
+
+		if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
+				(gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
+			val = readl(pp->dbi_base + PCIE_PL_PFLR);
+			val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
+			val |= PCIE_PL_PFLR_FORCE_LINK;
+			writel(val, pp->dbi_base + PCIE_PL_PFLR);
+
+			regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				IMX6Q_GPR12_PCIE_CTL_2, 0);
+		}
 
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_TEST_PD,
+			IMX6Q_GPR1_PCIE_TEST_PD);
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
+	}
 
 	return 0;
 }
@@ -270,18 +283,30 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		goto err_pcie;
 	}
 
-	/* power up core phy and enable ref clock */
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
-	/*
-	 * the async reset input need ref clock to sync internally,
-	 * when the ref clock comes after reset, internal synced
-	 * reset time is too short, cannot meet the requirement.
-	 * add one ~10us delay here.
-	 */
-	udelay(10);
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+	if (imx6_pcie->is_imx6sx) {
+		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
+		if (ret) {
+			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
+			goto err_inbound_axi;
+		}
+
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+			IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
+	} else {
+		/* power up core phy and enable ref clock */
+		regmap_update_bits(imx6_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
+		 * reset time is too short , cannot meet the requirement.
+		 * add one ~10us delay here.
+		 */
+		udelay(10);
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_REF_CLK_EN,
+			IMX6Q_GPR1_PCIE_REF_CLK_EN);
+	}
 
 	/* allow the clocks to stabilize */
 	usleep_range(200, 500);
@@ -292,8 +317,15 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		msleep(100);
 		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
 	}
+
+	if (imx6_pcie->is_imx6sx)
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+			IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
+
 	return 0;
 
+err_inbound_axi:
+	clk_disable_unprepare(imx6_pcie->pcie);
 err_pcie:
 	clk_disable_unprepare(imx6_pcie->pcie_bus);
 err_pcie_bus:
@@ -307,6 +339,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
 {
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 
+	if (imx6_pcie->is_imx6sx) {
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+			IMX6SX_GPR12_PCIE_RX_EQ_MASK,
+			IMX6SX_GPR12_PCIE_RX_EQ_2);
+	}
+
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
 
@@ -571,6 +609,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 	pp = &imx6_pcie->pp;
 	pp->dev = &pdev->dev;
 
+	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
+					"fsl,imx6sx-pcie");
+
 	/* Added for PCI abort handling */
 	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
 		"imprecise external abort");
@@ -606,6 +647,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(imx6_pcie->pcie);
 	}
 
+	if (imx6_pcie->is_imx6sx) {
+		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
+			"pcie_inbound_axi");
+		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
+			dev_err(&pdev->dev,
+				"pcie_incbound_axi clock missing or invalid\n");
+			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
+		}
+	}
+
 	/* Grab GPR config register range */
 	imx6_pcie->iomuxc_gpr =
 		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
@@ -632,6 +683,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
 
 static const struct of_device_id imx6_pcie_of_match[] = {
 	{ .compatible = "fsl,imx6q-pcie", },
+	{ .compatible = "fsl,imx6sx-pcie", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
-- 
2.1.4

Re: [PATCH v3 0/2] Add PCIe driver support for imx6sx

[Christoph Fritz]

*ping*

On Thu, 2016-02-25 at 15:47 +0100, Christoph Fritz wrote:
> v3:
>  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> v2:
>  * leave out regulator handling from driver, will be done later
>    in PM subsystem 
>  * use BIT() macro for MFD
> 
> Christoph Fritz (2):
>   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
>   PCI: imx6: add initial imx6sx support
> 
>  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
>  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
>  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
>  3 files changed, 101 insertions(+), 40 deletions(-)
> 

[PATCH v3 0/2] Add PCIe driver support for imx6sx

[Christoph Fritz]

*ping*

On Thu, 2016-02-25 at 15:47 +0100, Christoph Fritz wrote:
> v3:
>  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> v2:
>  * leave out regulator handling from driver, will be done later
>    in PM subsystem 
>  * use BIT() macro for MFD
> 
> Christoph Fritz (2):
>   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
>   PCI: imx6: add initial imx6sx support
> 
>  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
>  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
>  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
>  3 files changed, 101 insertions(+), 40 deletions(-)
> 

RE: [PATCH v3 0/2] Add PCIe driver support for imx6sx

[Richard Zhu]
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PiA+ICAgUENJOiBpbXg2OiBhZGQgaW5pdGlhbCBpbXg2c3ggc3VwcG9ydA0KPiA+DQo+ID4gIC4u
Li9kZXZpY2V0cmVlL2JpbmRpbmdzL3BjaS9mc2wsaW14NnEtcGNpZS50eHQgICAgIHwgICA2ICst
DQo+ID4gIGRyaXZlcnMvcGNpL2hvc3QvcGNpLWlteDYuYyAgICAgICAgICAgICAgICAgICAgICAg
IHwgMTMwICsrKysrKysrKysrKysrLS0tLS0tLQ0KPiA+ICBpbmNsdWRlL2xpbnV4L21mZC9zeXNj
b24vaW14NnEtaW9tdXhjLWdwci5oICAgICAgICB8ICAgNSArDQo+ID4gIDMgZmlsZXMgY2hhbmdl
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aG9uZ3hpbmddIEhpIENocmlzdG9waDoNCkknbSBva2F5IHdpdGggdGhpcyBwYXRjaC1zZXQuIEhv
cGUgdGhlIHJlZ3VsYXRvciBoYW5kaW5nIHBhdGNoIG1hbmRhdG9yeSByZXF1aXJlZCBieSBpbXg2
c3ggcGNpZQ0KaXMgbWVyZ2VkIGluIFBNIHN5c3RlbSBhc2FwLiA6KS4NClRoYW5rcy4NClJpY2hh
cmQNCg==

[PATCH v3 0/2] Add PCIe driver support for imx6sx

[Richard Zhu]

> -----Original Message-----
> From: Christoph Fritz [mailto:chf.fritz at googlemail.com]
> Sent: Thursday, March 03, 2016 9:41 AM
> To: Richard Zhu; Shawn Guo; Lucas Stach
> Cc: Fabio Estevam; Bjorn Helgaas; Lee Jones; linux-pci at vger.kernel.org; linux-
> arm-kernel at lists.infradead.org
> Subject: Re: [PATCH v3 0/2] Add PCIe driver support for imx6sx
> 
> *ping*
> 
> On Thu, 2016-02-25 at 15:47 +0100, Christoph Fritz wrote:
> > v3:
> >  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> > v2:
> >  * leave out regulator handling from driver, will be done later
> >    in PM subsystem
> >  * use BIT() macro for MFD
> >
> > Christoph Fritz (2):
> >   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
> >   PCI: imx6: add initial imx6sx support
> >
> >  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
> >  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
> >  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
> >  3 files changed, 101 insertions(+), 40 deletions(-)
> >
> 
> 
[Zhu hongxing] Hi Christoph:
I'm okay with this patch-set. Hope the regulator handing patch mandatory required by imx6sx pcie
is merged in PM system asap. :).
Thanks.
Richard

RE: [PATCH v3 0/2] Add PCIe driver support for imx6sx

[Richard Zhu]

> -----Original Message-----
> From: Christoph Fritz [mailto:chf.fritz@googlemail.com]
> Sent: Thursday, February 25, 2016 10:48 PM
> To: Richard Zhu; Lucas Stach; Shawn Guo; Fabio Estevam; Bjorn Helgaas; Lee
> Jones
> Cc: linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org
> Subject: [PATCH v3 0/2] Add PCIe driver support for imx6sx
> 
> v3:
>  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> v2:
>  * leave out regulator handling from driver, will be done later
>    in PM subsystem
>  * use BIT() macro for MFD
> 
> Christoph Fritz (2):
>   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
>   PCI: imx6: add initial imx6sx support
> 
>  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
>  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
>  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
>  3 files changed, 101 insertions(+), 40 deletions(-)
> 
> --
> 2.1.4

[Zhu hongxing]  Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
Richard
Best Regards

[PATCH v3 0/2] Add PCIe driver support for imx6sx

[Richard Zhu]

> -----Original Message-----
> From: Christoph Fritz [mailto:chf.fritz at googlemail.com]
> Sent: Thursday, February 25, 2016 10:48 PM
> To: Richard Zhu; Lucas Stach; Shawn Guo; Fabio Estevam; Bjorn Helgaas; Lee
> Jones
> Cc: linux-pci at vger.kernel.org; linux-arm-kernel at lists.infradead.org
> Subject: [PATCH v3 0/2] Add PCIe driver support for imx6sx
> 
> v3:
>  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> v2:
>  * leave out regulator handling from driver, will be done later
>    in PM subsystem
>  * use BIT() macro for MFD
> 
> Christoph Fritz (2):
>   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
>   PCI: imx6: add initial imx6sx support
> 
>  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
>  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
>  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
>  3 files changed, 101 insertions(+), 40 deletions(-)
> 
> --
> 2.1.4

[Zhu hongxing]  Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
Richard
Best Regards

Re: [PATCH v3 0/2] Add PCIe driver support for imx6sx

[Christoph Fritz]

On Thu, 2016-03-03 at 01:48 +0000, Richard Zhu wrote:
> > -----Original Message-----
> > From: Christoph Fritz [mailto:chf.fritz@googlemail.com]
> > Sent: Thursday, February 25, 2016 10:48 PM
> > To: Richard Zhu; Lucas Stach; Shawn Guo; Fabio Estevam; Bjorn Helgaas; Lee
> > Jones
> > Cc: linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org
> > Subject: [PATCH v3 0/2] Add PCIe driver support for imx6sx
> > 
> > v3:
> >  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> > v2:
> >  * leave out regulator handling from driver, will be done later
> >    in PM subsystem
> >  * use BIT() macro for MFD
> > 
> > Christoph Fritz (2):
> >   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
> >   PCI: imx6: add initial imx6sx support
> > 
> >  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
> >  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
> >  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
> >  3 files changed, 101 insertions(+), 40 deletions(-)
> > 
> > --
> > 2.1.4
> 
> [Zhu hongxing]  Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
> Richard
> Best Regards

@Bjorn: I suppose the PCI patch need to go through your tree. Would you
pick up this patch?

@Lee: What about the MFD patch, does this need to go through your tree?

Thanks
 -- Christoph

[PATCH v3 0/2] Add PCIe driver support for imx6sx

[Christoph Fritz]

On Thu, 2016-03-03 at 01:48 +0000, Richard Zhu wrote:
> > -----Original Message-----
> > From: Christoph Fritz [mailto:chf.fritz at googlemail.com]
> > Sent: Thursday, February 25, 2016 10:48 PM
> > To: Richard Zhu; Lucas Stach; Shawn Guo; Fabio Estevam; Bjorn Helgaas; Lee
> > Jones
> > Cc: linux-pci at vger.kernel.org; linux-arm-kernel at lists.infradead.org
> > Subject: [PATCH v3 0/2] Add PCIe driver support for imx6sx
> > 
> > v3:
> >  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> > v2:
> >  * leave out regulator handling from driver, will be done later
> >    in PM subsystem
> >  * use BIT() macro for MFD
> > 
> > Christoph Fritz (2):
> >   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
> >   PCI: imx6: add initial imx6sx support
> > 
> >  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
> >  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
> >  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
> >  3 files changed, 101 insertions(+), 40 deletions(-)
> > 
> > --
> > 2.1.4
> 
> [Zhu hongxing]  Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
> Richard
> Best Regards

@Bjorn: I suppose the PCI patch need to go through your tree. Would you
pick up this patch?

@Lee: What about the MFD patch, does this need to go through your tree?

Thanks
 -- Christoph

Re: [PATCH v3 1/2] MFD: imx6sx: Add PCIe register definitions for iomuxc gpr

[Lee Jones]

On Thu, 25 Feb 2016, Christoph Fritz wrote:

> This patch adds macros to define masks and bits for imx6sx
> PCIe registers. This is based on a patch by Richard Zhu.
> 
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> ---
>  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h | 5 +++++
>  1 file changed, 5 insertions(+)

I will change the non-conformant $SUBJECT line for you this time, but
please be more vigilant in the future.

Patch applied.

> diff --git a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
> index 558a485..238c8db 100644
> --- a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
> +++ b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
> @@ -422,6 +422,7 @@
>  #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_MASK		(0x1 << 26)
>  #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_ENABLE	(0x1 << 26)
>  #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_DISABLE	(0x0 << 26)
> +#define IMX6SX_GPR5_PCIE_BTNRST_RESET			BIT(19)
>  #define IMX6SX_GPR5_CSI1_MUX_CTRL_MASK			(0x3 << 4)
>  #define IMX6SX_GPR5_CSI1_MUX_CTRL_EXT_PIN		(0x0 << 4)
>  #define IMX6SX_GPR5_CSI1_MUX_CTRL_CVD			(0x1 << 4)
> @@ -435,6 +436,10 @@
>  #define IMX6SX_GPR5_DISP_MUX_DCIC1_LVDS			(0x1 << 1)
>  #define IMX6SX_GPR5_DISP_MUX_DCIC1_MASK			(0x1 << 1)
>  
> +#define IMX6SX_GPR12_PCIE_TEST_POWERDOWN		BIT(30)
> +#define IMX6SX_GPR12_PCIE_RX_EQ_MASK			(0x7 << 0)
> +#define IMX6SX_GPR12_PCIE_RX_EQ_2			(0x2 << 0)
> +
>  /* For imx6ul iomux gpr register field define */
>  #define IMX6UL_GPR1_ENET1_CLK_DIR		(0x1 << 17)
>  #define IMX6UL_GPR1_ENET2_CLK_DIR		(0x1 << 18)

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH v3 1/2] MFD: imx6sx: Add PCIe register definitions for iomuxc gpr

[Lee Jones]

On Thu, 25 Feb 2016, Christoph Fritz wrote:

> This patch adds macros to define masks and bits for imx6sx
> PCIe registers. This is based on a patch by Richard Zhu.
> 
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> ---
>  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h | 5 +++++
>  1 file changed, 5 insertions(+)

I will change the non-conformant $SUBJECT line for you this time, but
please be more vigilant in the future.

Patch applied.

> diff --git a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
> index 558a485..238c8db 100644
> --- a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
> +++ b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
> @@ -422,6 +422,7 @@
>  #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_MASK		(0x1 << 26)
>  #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_ENABLE	(0x1 << 26)
>  #define IMX6SX_GPR5_VADC_TO_CSI_CAPTURE_EN_DISABLE	(0x0 << 26)
> +#define IMX6SX_GPR5_PCIE_BTNRST_RESET			BIT(19)
>  #define IMX6SX_GPR5_CSI1_MUX_CTRL_MASK			(0x3 << 4)
>  #define IMX6SX_GPR5_CSI1_MUX_CTRL_EXT_PIN		(0x0 << 4)
>  #define IMX6SX_GPR5_CSI1_MUX_CTRL_CVD			(0x1 << 4)
> @@ -435,6 +436,10 @@
>  #define IMX6SX_GPR5_DISP_MUX_DCIC1_LVDS			(0x1 << 1)
>  #define IMX6SX_GPR5_DISP_MUX_DCIC1_MASK			(0x1 << 1)
>  
> +#define IMX6SX_GPR12_PCIE_TEST_POWERDOWN		BIT(30)
> +#define IMX6SX_GPR12_PCIE_RX_EQ_MASK			(0x7 << 0)
> +#define IMX6SX_GPR12_PCIE_RX_EQ_2			(0x2 << 0)
> +
>  /* For imx6ul iomux gpr register field define */
>  #define IMX6UL_GPR1_ENET1_CLK_DIR		(0x1 << 17)
>  #define IMX6UL_GPR1_ENET2_CLK_DIR		(0x1 << 18)

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org ? Open source software for ARM SoCs
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Re: [PATCH v3 0/2] Add PCIe driver support for imx6sx

[Christoph Fritz]

On Mon, 2016-03-07 at 09:20 +0100, Christoph Fritz wrote:
> On Thu, 2016-03-03 at 01:48 +0000, Richard Zhu wrote:
> > > -----Original Message-----
> > > From: Christoph Fritz [mailto:chf.fritz@googlemail.com]
> > > Sent: Thursday, February 25, 2016 10:48 PM
> > > To: Richard Zhu; Lucas Stach; Shawn Guo; Fabio Estevam; Bjorn Helgaas; Lee
> > > Jones
> > > Cc: linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org
> > > Subject: [PATCH v3 0/2] Add PCIe driver support for imx6sx
> > > 
> > > v3:
> > >  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> > > v2:
> > >  * leave out regulator handling from driver, will be done later
> > >    in PM subsystem
> > >  * use BIT() macro for MFD
> > > 
> > > Christoph Fritz (2):
> > >   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
> > >   PCI: imx6: add initial imx6sx support
> > > 
> > >  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
> > >  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
> > >  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
> > >  3 files changed, 101 insertions(+), 40 deletions(-)
> > > 
> > > --
> > > 2.1.4
> > 
> > [Zhu hongxing]  Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
> > Richard
> > Best Regards
> 
> @Bjorn: I suppose the PCI patch need to go through your tree. Would you
> pick up this patch?

*ping*
Do you want me to rebase my patch to your pci/host-imx6 branch?

Thanks
 -- Christoph

[PATCH v3 0/2] Add PCIe driver support for imx6sx

[Christoph Fritz]

On Mon, 2016-03-07 at 09:20 +0100, Christoph Fritz wrote:
> On Thu, 2016-03-03 at 01:48 +0000, Richard Zhu wrote:
> > > -----Original Message-----
> > > From: Christoph Fritz [mailto:chf.fritz at googlemail.com]
> > > Sent: Thursday, February 25, 2016 10:48 PM
> > > To: Richard Zhu; Lucas Stach; Shawn Guo; Fabio Estevam; Bjorn Helgaas; Lee
> > > Jones
> > > Cc: linux-pci at vger.kernel.org; linux-arm-kernel at lists.infradead.org
> > > Subject: [PATCH v3 0/2] Add PCIe driver support for imx6sx
> > > 
> > > v3:
> > >  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> > > v2:
> > >  * leave out regulator handling from driver, will be done later
> > >    in PM subsystem
> > >  * use BIT() macro for MFD
> > > 
> > > Christoph Fritz (2):
> > >   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
> > >   PCI: imx6: add initial imx6sx support
> > > 
> > >  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
> > >  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
> > >  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
> > >  3 files changed, 101 insertions(+), 40 deletions(-)
> > > 
> > > --
> > > 2.1.4
> > 
> > [Zhu hongxing]  Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
> > Richard
> > Best Regards
> 
> @Bjorn: I suppose the PCI patch need to go through your tree. Would you
> pick up this patch?

*ping*
Do you want me to rebase my patch to your pci/host-imx6 branch?

Thanks
 -- Christoph

Re: [PATCH v3 0/2] Add PCIe driver support for imx6sx

[Lucas Stach]

Am Mittwoch, den 09.03.2016, 16:39 +0100 schrieb Christoph Fritz:
> On Mon, 2016-03-07 at 09:20 +0100, Christoph Fritz wrote:
> > On Thu, 2016-03-03 at 01:48 +0000, Richard Zhu wrote:
> > > > -----Original Message-----
> > > > From: Christoph Fritz [mailto:chf.fritz@googlemail.com]
> > > > Sent: Thursday, February 25, 2016 10:48 PM
> > > > To: Richard Zhu; Lucas Stach; Shawn Guo; Fabio Estevam; Bjorn Helgaas; Lee
> > > > Jones
> > > > Cc: linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org
> > > > Subject: [PATCH v3 0/2] Add PCIe driver support for imx6sx
> > > > 
> > > > v3:
> > > >  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> > > > v2:
> > > >  * leave out regulator handling from driver, will be done later
> > > >    in PM subsystem
> > > >  * use BIT() macro for MFD
> > > > 
> > > > Christoph Fritz (2):
> > > >   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
> > > >   PCI: imx6: add initial imx6sx support
> > > > 
> > > >  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
> > > >  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
> > > >  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
> > > >  3 files changed, 101 insertions(+), 40 deletions(-)
> > > > 
> > > > --
> > > > 2.1.4
> > > 
> > > [Zhu hongxing]  Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
> > > Richard
> > > Best Regards
> > 
> > @Bjorn: I suppose the PCI patch need to go through your tree. Would you
> > pick up this patch?
> 
> *ping*
> Do you want me to rebase my patch to your pci/host-imx6 branch?
> 
I was unsure if we are going to break DT stability at a later point if
we pull this series in without the GPC changes. But after thinking a bit
more about this it should be fine.

So series is:
Acked-by: Lucas Stach <l.stach@pengutronix.de>

[PATCH v3 0/2] Add PCIe driver support for imx6sx

[Lucas Stach]

Am Mittwoch, den 09.03.2016, 16:39 +0100 schrieb Christoph Fritz:
> On Mon, 2016-03-07 at 09:20 +0100, Christoph Fritz wrote:
> > On Thu, 2016-03-03 at 01:48 +0000, Richard Zhu wrote:
> > > > -----Original Message-----
> > > > From: Christoph Fritz [mailto:chf.fritz at googlemail.com]
> > > > Sent: Thursday, February 25, 2016 10:48 PM
> > > > To: Richard Zhu; Lucas Stach; Shawn Guo; Fabio Estevam; Bjorn Helgaas; Lee
> > > > Jones
> > > > Cc: linux-pci at vger.kernel.org; linux-arm-kernel at lists.infradead.org
> > > > Subject: [PATCH v3 0/2] Add PCIe driver support for imx6sx
> > > > 
> > > > v3:
> > > >  * adapt devicetree bindings documentation fsl,imx6q-pcie.txt
> > > > v2:
> > > >  * leave out regulator handling from driver, will be done later
> > > >    in PM subsystem
> > > >  * use BIT() macro for MFD
> > > > 
> > > > Christoph Fritz (2):
> > > >   MFD: imx6sx: Add PCIe register definitions for iomuxc gpr
> > > >   PCI: imx6: add initial imx6sx support
> > > > 
> > > >  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
> > > >  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
> > > >  include/linux/mfd/syscon/imx6q-iomuxc-gpr.h        |   5 +
> > > >  3 files changed, 101 insertions(+), 40 deletions(-)
> > > > 
> > > > --
> > > > 2.1.4
> > > 
> > > [Zhu hongxing]  Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
> > > Richard
> > > Best Regards
> > 
> > @Bjorn: I suppose the PCI patch need to go through your tree. Would you
> > pick up this patch?
> 
> *ping*
> Do you want me to rebase my patch to your pci/host-imx6 branch?
> 
I was unsure if we are going to break DT stability at a later point if
we pull this series in without the GPC changes. But after thinking a bit
more about this it should be fine.

So series is:
Acked-by: Lucas Stach <l.stach@pengutronix.de>

Re: [PATCH v3 2/2] PCI: imx6: add initial imx6sx support

[Bjorn Helgaas]

Hi Christoph (and Lee; there's a question for you below, too),

On Thu, Feb 25, 2016 at 03:47:49PM +0100, Christoph Fritz wrote:
> This patch adds initial PCIe support for the imx6 SoC derivate imx6sx.
> PCI_MSI support is untested as its necessary suspend/resume quirk is
> left out of this patch.
> This patch is heavily based on patches by Richard Zhu.
> 
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> ---
>  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
>  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
>  2 files changed, 96 insertions(+), 40 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> index 6fbba53..c4323be 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> @@ -4,7 +4,7 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
>  and thus inherits all the common properties defined in designware-pcie.txt.
>  
>  Required properties:
> -- compatible: "fsl,imx6q-pcie"
> +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
>  - reg: base addresse and length of the pcie controller

I folded in a typo fix for "addresse".

>  - interrupts: A list of interrupt outputs of the controller. Must contain an
>    entry for each entry in the interrupt-names property.
> @@ -13,6 +13,10 @@ Required properties:
>  - clock-names: Must include the following additional entries:
>  	- "pcie_phy"
>  
> +Additional required properties for imx6sx-pcie:
> +- clock names: Must include the following additional entries:
> +	- "pcie_inbound_axi"
> +
>  Example:
>  
>  	pcie@0x01000000 {
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index fe60096..7e634a6 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -35,9 +35,11 @@ struct imx6_pcie {
>  	struct gpio_desc	*reset_gpio;
>  	struct clk		*pcie_bus;
>  	struct clk		*pcie_phy;
> +	struct clk		*pcie_inbound_axi;
>  	struct clk		*pcie;
>  	struct pcie_port	pp;
>  	struct regmap		*iomuxc_gpr;
> +	bool			is_imx6sx;
>  	void __iomem		*mem_base;
>  };
>  
> @@ -214,35 +216,46 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  	u32 val, gpr1, gpr12;
>  
> -	/*
> -	 * If the bootloader already enabled the link we need some special
> -	 * handling to get the core back into a state where it is safe to
> -	 * touch it for configuration.  As there is no dedicated reset signal
> -	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
> -	 * state before completely disabling LTSSM, which is a prerequisite
> -	 * for core configuration.
> -	 *
> -	 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
> -	 * indication that the bootloader activated the link.
> -	 */
> -	regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
> -	regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
> -
> -	if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
> -	    (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
> -		val = readl(pp->dbi_base + PCIE_PL_PFLR);
> -		val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
> -		val |= PCIE_PL_PFLR_FORCE_LINK;
> -		writel(val, pp->dbi_base + PCIE_PL_PFLR);
> -
> +	if (imx6_pcie->is_imx6sx) {
>  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> -				IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
> -	}
> +				IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> +				IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
> +		/* Force PCIe PHY reset */
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +					IMX6SX_GPR5_PCIE_BTNRST_RESET,
> +					IMX6SX_GPR5_PCIE_BTNRST_RESET);

Since there's nothing after the "else" clause, I think it's better to
return immediately here.  Then we don't have extra diffs that merely
indent the original function.  I did make this change (I'll attach my
resulting patch), and that made some other changes to the indented
code more visible.

> +	} else {
> +		/*
> +		 * If the bootloader already enabled the link we need some
> +		 * special handling to get the core back into a state where
> +		 * it is safe to touch it for configuration.  As there is no
> +		 * dedicated reset signal to manually force LTSSM into "detect"
> +		 * state before completely disabling LTSSM, which is a
> +		 * prerequisite for core configuration.

For example, you changed this comment, and now the last sentence is no
longer a sentence.  I don't know if this was an editing mistake or if
this comment really does need to change.  If it does need to change,
it needs to stay a sentence.

> +		 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have
> +		 * a strong indication that the bootloader activated the link.
> +		 */
> +		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
> +		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
> +
> +		if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
> +				(gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
> +			val = readl(pp->dbi_base + PCIE_PL_PFLR);
> +			val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
> +			val |= PCIE_PL_PFLR_FORCE_LINK;
> +			writel(val, pp->dbi_base + PCIE_PL_PFLR);
> +
> +			regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				IMX6Q_GPR12_PCIE_CTL_2, 0);
> +		}
>  
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_TEST_PD,
> +			IMX6Q_GPR1_PCIE_TEST_PD);
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);

And there are subtle changes here (changing "1 << 18" to
IMX6Q_GPR1_PCIE_TEST_PD, etc.)  These are fine, but should be in a
separate patch because (a) they're not related to imx6sx and (b) it
makes them obvious and easy to review.  As it is, they just get snuck
in under the radar.

> +	}
>  
>  	return 0;
>  }
> @@ -270,18 +283,30 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		goto err_pcie;
>  	}
>  
> -	/* power up core phy and enable ref clock */
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> -	/*
> -	 * the async reset input need ref clock to sync internally,
> -	 * when the ref clock comes after reset, internal synced
> -	 * reset time is too short, cannot meet the requirement.
> -	 * add one ~10us delay here.
> -	 */
> -	udelay(10);
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	if (imx6_pcie->is_imx6sx) {
> +		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> +		if (ret) {
> +			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> +			goto err_inbound_axi;
> +		}
> +
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +			IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> +	} else {
> +		/* power up core phy and enable ref clock */
> +		regmap_update_bits(imx6_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
> +		 * reset time is too short , cannot meet the requirement.
> +		 * add one ~10us delay here.
> +		 */
> +		udelay(10);
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_REF_CLK_EN,
> +			IMX6Q_GPR1_PCIE_REF_CLK_EN);
> +	}

Here again the diff is bigger than necessary because it re-indents the
original code (and makes another unrelated "1 << 16" to
IMX6Q_GPR1_PCIE_REF_CLK_EN change).  I'll show a different proposal in
my patch below.

>  	/* allow the clocks to stabilize */
>  	usleep_range(200, 500);
> @@ -292,8 +317,15 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		msleep(100);
>  		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
>  	}
> +
> +	if (imx6_pcie->is_imx6sx)
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +			IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
> +
>  	return 0;
>  
> +err_inbound_axi:
> +	clk_disable_unprepare(imx6_pcie->pcie);
>  err_pcie:
>  	clk_disable_unprepare(imx6_pcie->pcie_bus);
>  err_pcie_bus:
> @@ -307,6 +339,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
>  {
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +			IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> +			IMX6SX_GPR12_PCIE_RX_EQ_2);

I see that you added definitions for IMX6SX_GPR12_PCIE_RX_EQ_MASK and
IMX6SX_GPR12_PCIE_RX_EQ_2 in the first patch of this series, but doing
that separately creates a merge problem.  I can't put this change in
my tree by itself because it won't build.  If Lee applied the first
patch to a git branch, I guess I could pull that into my tree.  But it
would be far simpler to just include those new definitions in this
patch.

> +	}
> +
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
>  
> @@ -571,6 +609,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  	pp = &imx6_pcie->pp;
>  	pp->dev = &pdev->dev;
>  
> +	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
> +					"fsl,imx6sx-pcie");
> +
>  	/* Added for PCI abort handling */
>  	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
>  		"imprecise external abort");
> @@ -606,6 +647,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  		return PTR_ERR(imx6_pcie->pcie);
>  	}
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
> +			"pcie_inbound_axi");
> +		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
> +			dev_err(&pdev->dev,
> +				"pcie_incbound_axi clock missing or invalid\n");
> +			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
> +		}
> +	}
> +
>  	/* Grab GPR config register range */
>  	imx6_pcie->iomuxc_gpr =
>  		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
> @@ -632,6 +683,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
>  
>  static const struct of_device_id imx6_pcie_of_match[] = {
>  	{ .compatible = "fsl,imx6q-pcie", },
> +	{ .compatible = "fsl,imx6sx-pcie", },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);

The patches below are what I currently have in my tree, but they're
not ready for v4.6 (yet).

Note that the second one is very clearly imx6sx-only.  It's obvious
there are no tweaks to the existing imx6 code, which makes it easier
to review, backport, bisect, revert, etc.

Obviously, I can't apply these directly.  First we have to:

  - Fix the LTSSM comment
  - Figure out how to get the IMX6SX_GPR12_PCIE_RX_EQ_MASK definitions


commit 78abf60b815a8f28207d029d61f7809647faa43a
Author: Bjorn Helgaas <bhelgaas@google.com>
Date:   Fri Mar 11 11:15:36 2016 -0600

    PCI: imx6: Factor out ref clock enable
    
    Factor out ref clock enable to make it cleaner to add imx6sx support.  No
    functional change intended.
    
    Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 8c9b389..ecc8537 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -269,6 +269,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 	return 0;
 }
 
+static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
+{
+	/* power up core phy and enable ref clock */
+	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
+	/*
+	 * the async reset input need ref clock to sync internally,
+	 * when the ref clock comes after reset, internal synced
+	 * reset time is too short, cannot meet the requirement.
+	 * add one ~10us delay here.
+	 */
+	udelay(10);
+	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+	return 0;
+}
+
 static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 {
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
@@ -292,18 +309,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		goto err_pcie;
 	}
 
-	/* power up core phy and enable ref clock */
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
-	/*
-	 * the async reset input need ref clock to sync internally,
-	 * when the ref clock comes after reset, internal synced
-	 * reset time is too short, cannot meet the requirement.
-	 * add one ~10us delay here.
-	 */
-	udelay(10);
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
+	if (ret)
+		dev_err(pp->dev, "unable to enable pcie ref clock\n");
+		goto err_ref_clk;
+	}
 
 	/* allow the clocks to stabilize */
 	usleep_range(200, 500);
@@ -316,6 +326,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 	}
 	return 0;
 
+err_ref_clk:
+	clk_disable_unprepare(imx6_pcie->pcie);
 err_pcie:
 	clk_disable_unprepare(imx6_pcie->pcie_bus);
 err_pcie_bus:

commit d061033570b7fd22a3ed8c029d4793e5df7324e1
Author: Christoph Fritz <chf.fritz@googlemail.com>
Date:   Thu Mar 10 15:04:25 2016 -0600

    PCI: imx6: Add initial imx6sx support
    
    Add initial PCIe support for the imx6 SoC derivate imx6sx.  PCI MSI support
    is untested as the necessary suspend/resume quirk is not included in this
    patch.
    
    This patch is heavily based on patches by Richard Zhu.
    
    [bhelgaas: factor out refclk enable, fix adjacent typos in fsl,imx6q-pcie.txt]
    Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
    Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
    Acked-by: Lucas Stach <l.stach@pengutronix.de>

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index 3be80c6..0561e88 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -4,8 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
 and thus inherits all the common properties defined in designware-pcie.txt.
 
 Required properties:
-- compatible: "fsl,imx6q-pcie"
-- reg: base addresse and length of the pcie controller
+- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
+- reg: base address and length of the PCIe controller
 - interrupts: A list of interrupt outputs of the controller. Must contain an
   entry for each entry in the interrupt-names property.
 - interrupt-names: Must include the following entries:
@@ -20,6 +20,10 @@ Optional properties:
 - fsl,tx-swing-full: Gen2 TX SWING FULL value. Default: 127
 - fsl,tx-swing-low: TX launch amplitude swing_low value. Default: 127
 
+Additional required properties for imx6sx-pcie:
+- clock names: Must include the following additional entries:
+	- "pcie_inbound_axi"
+
 Example:
 
 	pcie@0x01000000 {
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index ecc8537..4d6af21 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -35,9 +35,11 @@ struct imx6_pcie {
 	struct gpio_desc	*reset_gpio;
 	struct clk		*pcie_bus;
 	struct clk		*pcie_phy;
+	struct clk		*pcie_inbound_axi;
 	struct clk		*pcie;
 	struct pcie_port	pp;
 	struct regmap		*iomuxc_gpr;
+	bool			is_imx6sx;
 	void __iomem		*mem_base;
 	u32			tx_deemph_gen1;
 	u32			tx_deemph_gen2_3p5db;
@@ -236,13 +238,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 	u32 val, gpr1, gpr12;
 
+	if (imx6_pcie->is_imx6sx) {
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
+		/* Force PCIe PHY reset */
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET);
+		return 0;
+	}
+
 	/*
 	 * If the bootloader already enabled the link we need some special
 	 * handling to get the core back into a state where it is safe to
 	 * touch it for configuration.  As there is no dedicated reset signal
-	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
-	 * state before completely disabling LTSSM, which is a prerequisite
-	 * for core configuration.
+	 * to manually force LTSSM into "detect" state before completely
+	 * disabling LTSSM, which is a prerequisite for core configuration.
 	 *
 	 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
 	 * indication that the bootloader activated the link.
@@ -271,6 +283,18 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 
 static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 {
+	if (imx6_pcie->is_imx6sx) {
+		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
+		if (ret) {
+			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
+			return ret;
+		}
+
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
+		return 0;
+	}
+
 	/* power up core phy and enable ref clock */
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
 			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
@@ -324,6 +348,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		msleep(100);
 		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
 	}
+
+	if (imx6_pcie->is_imx6sx)
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
+
 	return 0;
 
 err_ref_clk:
@@ -341,6 +370,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
 {
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 
+	if (imx6_pcie->is_imx6sx) {
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_RX_EQ_MASK,
+				   IMX6SX_GPR12_PCIE_RX_EQ_2);
+	}
+
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
 
@@ -565,6 +600,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 	pp = &imx6_pcie->pp;
 	pp->dev = &pdev->dev;
 
+	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
+						       "fsl,imx6sx-pcie");
+
 	/* Added for PCI abort handling */
 	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
 		"imprecise external abort");
@@ -600,6 +638,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(imx6_pcie->pcie);
 	}
 
+	if (imx6_pcie->is_imx6sx) {
+		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
+							   "pcie_inbound_axi");
+		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
+			dev_err(&pdev->dev,
+				"pcie_incbound_axi clock missing or invalid\n");
+			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
+		}
+	}
+
 	/* Grab GPR config register range */
 	imx6_pcie->iomuxc_gpr =
 		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
@@ -647,6 +695,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
 
 static const struct of_device_id imx6_pcie_of_match[] = {
 	{ .compatible = "fsl,imx6q-pcie", },
+	{ .compatible = "fsl,imx6sx-pcie", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);

[PATCH v3 2/2] PCI: imx6: add initial imx6sx support

[Bjorn Helgaas]

Hi Christoph (and Lee; there's a question for you below, too),

On Thu, Feb 25, 2016 at 03:47:49PM +0100, Christoph Fritz wrote:
> This patch adds initial PCIe support for the imx6 SoC derivate imx6sx.
> PCI_MSI support is untested as its necessary suspend/resume quirk is
> left out of this patch.
> This patch is heavily based on patches by Richard Zhu.
> 
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> ---
>  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
>  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
>  2 files changed, 96 insertions(+), 40 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> index 6fbba53..c4323be 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> @@ -4,7 +4,7 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
>  and thus inherits all the common properties defined in designware-pcie.txt.
>  
>  Required properties:
> -- compatible: "fsl,imx6q-pcie"
> +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
>  - reg: base addresse and length of the pcie controller

I folded in a typo fix for "addresse".

>  - interrupts: A list of interrupt outputs of the controller. Must contain an
>    entry for each entry in the interrupt-names property.
> @@ -13,6 +13,10 @@ Required properties:
>  - clock-names: Must include the following additional entries:
>  	- "pcie_phy"
>  
> +Additional required properties for imx6sx-pcie:
> +- clock names: Must include the following additional entries:
> +	- "pcie_inbound_axi"
> +
>  Example:
>  
>  	pcie at 0x01000000 {
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index fe60096..7e634a6 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -35,9 +35,11 @@ struct imx6_pcie {
>  	struct gpio_desc	*reset_gpio;
>  	struct clk		*pcie_bus;
>  	struct clk		*pcie_phy;
> +	struct clk		*pcie_inbound_axi;
>  	struct clk		*pcie;
>  	struct pcie_port	pp;
>  	struct regmap		*iomuxc_gpr;
> +	bool			is_imx6sx;
>  	void __iomem		*mem_base;
>  };
>  
> @@ -214,35 +216,46 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  	u32 val, gpr1, gpr12;
>  
> -	/*
> -	 * If the bootloader already enabled the link we need some special
> -	 * handling to get the core back into a state where it is safe to
> -	 * touch it for configuration.  As there is no dedicated reset signal
> -	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
> -	 * state before completely disabling LTSSM, which is a prerequisite
> -	 * for core configuration.
> -	 *
> -	 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
> -	 * indication that the bootloader activated the link.
> -	 */
> -	regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
> -	regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
> -
> -	if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
> -	    (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
> -		val = readl(pp->dbi_base + PCIE_PL_PFLR);
> -		val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
> -		val |= PCIE_PL_PFLR_FORCE_LINK;
> -		writel(val, pp->dbi_base + PCIE_PL_PFLR);
> -
> +	if (imx6_pcie->is_imx6sx) {
>  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> -				IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
> -	}
> +				IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> +				IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
> +		/* Force PCIe PHY reset */
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +					IMX6SX_GPR5_PCIE_BTNRST_RESET,
> +					IMX6SX_GPR5_PCIE_BTNRST_RESET);

Since there's nothing after the "else" clause, I think it's better to
return immediately here.  Then we don't have extra diffs that merely
indent the original function.  I did make this change (I'll attach my
resulting patch), and that made some other changes to the indented
code more visible.

> +	} else {
> +		/*
> +		 * If the bootloader already enabled the link we need some
> +		 * special handling to get the core back into a state where
> +		 * it is safe to touch it for configuration.  As there is no
> +		 * dedicated reset signal to manually force LTSSM into "detect"
> +		 * state before completely disabling LTSSM, which is a
> +		 * prerequisite for core configuration.

For example, you changed this comment, and now the last sentence is no
longer a sentence.  I don't know if this was an editing mistake or if
this comment really does need to change.  If it does need to change,
it needs to stay a sentence.

> +		 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have
> +		 * a strong indication that the bootloader activated the link.
> +		 */
> +		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
> +		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
> +
> +		if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
> +				(gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
> +			val = readl(pp->dbi_base + PCIE_PL_PFLR);
> +			val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
> +			val |= PCIE_PL_PFLR_FORCE_LINK;
> +			writel(val, pp->dbi_base + PCIE_PL_PFLR);
> +
> +			regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				IMX6Q_GPR12_PCIE_CTL_2, 0);
> +		}
>  
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_TEST_PD,
> +			IMX6Q_GPR1_PCIE_TEST_PD);
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);

And there are subtle changes here (changing "1 << 18" to
IMX6Q_GPR1_PCIE_TEST_PD, etc.)  These are fine, but should be in a
separate patch because (a) they're not related to imx6sx and (b) it
makes them obvious and easy to review.  As it is, they just get snuck
in under the radar.

> +	}
>  
>  	return 0;
>  }
> @@ -270,18 +283,30 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		goto err_pcie;
>  	}
>  
> -	/* power up core phy and enable ref clock */
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> -	/*
> -	 * the async reset input need ref clock to sync internally,
> -	 * when the ref clock comes after reset, internal synced
> -	 * reset time is too short, cannot meet the requirement.
> -	 * add one ~10us delay here.
> -	 */
> -	udelay(10);
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	if (imx6_pcie->is_imx6sx) {
> +		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> +		if (ret) {
> +			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> +			goto err_inbound_axi;
> +		}
> +
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +			IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> +	} else {
> +		/* power up core phy and enable ref clock */
> +		regmap_update_bits(imx6_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
> +		 * reset time is too short , cannot meet the requirement.
> +		 * add one ~10us delay here.
> +		 */
> +		udelay(10);
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_REF_CLK_EN,
> +			IMX6Q_GPR1_PCIE_REF_CLK_EN);
> +	}

Here again the diff is bigger than necessary because it re-indents the
original code (and makes another unrelated "1 << 16" to
IMX6Q_GPR1_PCIE_REF_CLK_EN change).  I'll show a different proposal in
my patch below.

>  	/* allow the clocks to stabilize */
>  	usleep_range(200, 500);
> @@ -292,8 +317,15 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		msleep(100);
>  		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
>  	}
> +
> +	if (imx6_pcie->is_imx6sx)
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +			IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
> +
>  	return 0;
>  
> +err_inbound_axi:
> +	clk_disable_unprepare(imx6_pcie->pcie);
>  err_pcie:
>  	clk_disable_unprepare(imx6_pcie->pcie_bus);
>  err_pcie_bus:
> @@ -307,6 +339,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
>  {
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +			IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> +			IMX6SX_GPR12_PCIE_RX_EQ_2);

I see that you added definitions for IMX6SX_GPR12_PCIE_RX_EQ_MASK and
IMX6SX_GPR12_PCIE_RX_EQ_2 in the first patch of this series, but doing
that separately creates a merge problem.  I can't put this change in
my tree by itself because it won't build.  If Lee applied the first
patch to a git branch, I guess I could pull that into my tree.  But it
would be far simpler to just include those new definitions in this
patch.

> +	}
> +
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
>  
> @@ -571,6 +609,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  	pp = &imx6_pcie->pp;
>  	pp->dev = &pdev->dev;
>  
> +	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
> +					"fsl,imx6sx-pcie");
> +
>  	/* Added for PCI abort handling */
>  	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
>  		"imprecise external abort");
> @@ -606,6 +647,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  		return PTR_ERR(imx6_pcie->pcie);
>  	}
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
> +			"pcie_inbound_axi");
> +		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
> +			dev_err(&pdev->dev,
> +				"pcie_incbound_axi clock missing or invalid\n");
> +			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
> +		}
> +	}
> +
>  	/* Grab GPR config register range */
>  	imx6_pcie->iomuxc_gpr =
>  		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
> @@ -632,6 +683,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
>  
>  static const struct of_device_id imx6_pcie_of_match[] = {
>  	{ .compatible = "fsl,imx6q-pcie", },
> +	{ .compatible = "fsl,imx6sx-pcie", },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);

The patches below are what I currently have in my tree, but they're
not ready for v4.6 (yet).

Note that the second one is very clearly imx6sx-only.  It's obvious
there are no tweaks to the existing imx6 code, which makes it easier
to review, backport, bisect, revert, etc.

Obviously, I can't apply these directly.  First we have to:

  - Fix the LTSSM comment
  - Figure out how to get the IMX6SX_GPR12_PCIE_RX_EQ_MASK definitions


commit 78abf60b815a8f28207d029d61f7809647faa43a
Author: Bjorn Helgaas <bhelgaas@google.com>
Date:   Fri Mar 11 11:15:36 2016 -0600

    PCI: imx6: Factor out ref clock enable
    
    Factor out ref clock enable to make it cleaner to add imx6sx support.  No
    functional change intended.
    
    Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 8c9b389..ecc8537 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -269,6 +269,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 	return 0;
 }
 
+static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
+{
+	/* power up core phy and enable ref clock */
+	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
+	/*
+	 * the async reset input need ref clock to sync internally,
+	 * when the ref clock comes after reset, internal synced
+	 * reset time is too short, cannot meet the requirement.
+	 * add one ~10us delay here.
+	 */
+	udelay(10);
+	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+	return 0;
+}
+
 static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 {
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
@@ -292,18 +309,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		goto err_pcie;
 	}
 
-	/* power up core phy and enable ref clock */
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
-	/*
-	 * the async reset input need ref clock to sync internally,
-	 * when the ref clock comes after reset, internal synced
-	 * reset time is too short, cannot meet the requirement.
-	 * add one ~10us delay here.
-	 */
-	udelay(10);
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
+	if (ret)
+		dev_err(pp->dev, "unable to enable pcie ref clock\n");
+		goto err_ref_clk;
+	}
 
 	/* allow the clocks to stabilize */
 	usleep_range(200, 500);
@@ -316,6 +326,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 	}
 	return 0;
 
+err_ref_clk:
+	clk_disable_unprepare(imx6_pcie->pcie);
 err_pcie:
 	clk_disable_unprepare(imx6_pcie->pcie_bus);
 err_pcie_bus:

commit d061033570b7fd22a3ed8c029d4793e5df7324e1
Author: Christoph Fritz <chf.fritz@googlemail.com>
Date:   Thu Mar 10 15:04:25 2016 -0600

    PCI: imx6: Add initial imx6sx support
    
    Add initial PCIe support for the imx6 SoC derivate imx6sx.  PCI MSI support
    is untested as the necessary suspend/resume quirk is not included in this
    patch.
    
    This patch is heavily based on patches by Richard Zhu.
    
    [bhelgaas: factor out refclk enable, fix adjacent typos in fsl,imx6q-pcie.txt]
    Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
    Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
    Acked-by: Lucas Stach <l.stach@pengutronix.de>

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index 3be80c6..0561e88 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -4,8 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
 and thus inherits all the common properties defined in designware-pcie.txt.
 
 Required properties:
-- compatible: "fsl,imx6q-pcie"
-- reg: base addresse and length of the pcie controller
+- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
+- reg: base address and length of the PCIe controller
 - interrupts: A list of interrupt outputs of the controller. Must contain an
   entry for each entry in the interrupt-names property.
 - interrupt-names: Must include the following entries:
@@ -20,6 +20,10 @@ Optional properties:
 - fsl,tx-swing-full: Gen2 TX SWING FULL value. Default: 127
 - fsl,tx-swing-low: TX launch amplitude swing_low value. Default: 127
 
+Additional required properties for imx6sx-pcie:
+- clock names: Must include the following additional entries:
+	- "pcie_inbound_axi"
+
 Example:
 
 	pcie at 0x01000000 {
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index ecc8537..4d6af21 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -35,9 +35,11 @@ struct imx6_pcie {
 	struct gpio_desc	*reset_gpio;
 	struct clk		*pcie_bus;
 	struct clk		*pcie_phy;
+	struct clk		*pcie_inbound_axi;
 	struct clk		*pcie;
 	struct pcie_port	pp;
 	struct regmap		*iomuxc_gpr;
+	bool			is_imx6sx;
 	void __iomem		*mem_base;
 	u32			tx_deemph_gen1;
 	u32			tx_deemph_gen2_3p5db;
@@ -236,13 +238,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 	u32 val, gpr1, gpr12;
 
+	if (imx6_pcie->is_imx6sx) {
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
+		/* Force PCIe PHY reset */
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET);
+		return 0;
+	}
+
 	/*
 	 * If the bootloader already enabled the link we need some special
 	 * handling to get the core back into a state where it is safe to
 	 * touch it for configuration.  As there is no dedicated reset signal
-	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
-	 * state before completely disabling LTSSM, which is a prerequisite
-	 * for core configuration.
+	 * to manually force LTSSM into "detect" state before completely
+	 * disabling LTSSM, which is a prerequisite for core configuration.
 	 *
 	 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
 	 * indication that the bootloader activated the link.
@@ -271,6 +283,18 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 
 static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 {
+	if (imx6_pcie->is_imx6sx) {
+		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
+		if (ret) {
+			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
+			return ret;
+		}
+
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
+		return 0;
+	}
+
 	/* power up core phy and enable ref clock */
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
 			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
@@ -324,6 +348,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		msleep(100);
 		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
 	}
+
+	if (imx6_pcie->is_imx6sx)
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
+
 	return 0;
 
 err_ref_clk:
@@ -341,6 +370,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
 {
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 
+	if (imx6_pcie->is_imx6sx) {
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_RX_EQ_MASK,
+				   IMX6SX_GPR12_PCIE_RX_EQ_2);
+	}
+
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
 
@@ -565,6 +600,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 	pp = &imx6_pcie->pp;
 	pp->dev = &pdev->dev;
 
+	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
+						       "fsl,imx6sx-pcie");
+
 	/* Added for PCI abort handling */
 	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
 		"imprecise external abort");
@@ -600,6 +638,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(imx6_pcie->pcie);
 	}
 
+	if (imx6_pcie->is_imx6sx) {
+		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
+							   "pcie_inbound_axi");
+		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
+			dev_err(&pdev->dev,
+				"pcie_incbound_axi clock missing or invalid\n");
+			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
+		}
+	}
+
 	/* Grab GPR config register range */
 	imx6_pcie->iomuxc_gpr =
 		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
@@ -647,6 +695,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
 
 static const struct of_device_id imx6_pcie_of_match[] = {
 	{ .compatible = "fsl,imx6q-pcie", },
+	{ .compatible = "fsl,imx6sx-pcie", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);

Re: [PATCH v3 2/2] PCI: imx6: add initial imx6sx support

[Christoph Fritz]

Hi Bjorn

On Fri, 2016-03-11 at 11:58 -0600, Bjorn Helgaas wrote:
> Hi Christoph (and Lee; there's a question for you below, too),

Thanks for your review, please see my answers and comments below.

> On Thu, Feb 25, 2016 at 03:47:49PM +0100, Christoph Fritz wrote:
> > This patch adds initial PCIe support for the imx6 SoC derivate imx6sx.
> > PCI_MSI support is untested as its necessary suspend/resume quirk is
> > left out of this patch.
> > This patch is heavily based on patches by Richard Zhu.
> > 
> > Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> > ---
> >  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
> >  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
> >  2 files changed, 96 insertions(+), 40 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > index 6fbba53..c4323be 100644
> > --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > @@ -4,7 +4,7 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
> >  and thus inherits all the common properties defined in designware-pcie.txt.
> >  
> >  Required properties:
> > -- compatible: "fsl,imx6q-pcie"
> > +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
> >  - reg: base addresse and length of the pcie controller
> 
> I folded in a typo fix for "addresse".
> 
> >  - interrupts: A list of interrupt outputs of the controller. Must contain an
> >    entry for each entry in the interrupt-names property.
> > @@ -13,6 +13,10 @@ Required properties:
> >  - clock-names: Must include the following additional entries:
> >  	- "pcie_phy"
> >  
> > +Additional required properties for imx6sx-pcie:
> > +- clock names: Must include the following additional entries:
> > +	- "pcie_inbound_axi"
> > +
> >  Example:
> >  
> >  	pcie@0x01000000 {
> > diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> > index fe60096..7e634a6 100644
> > --- a/drivers/pci/host/pci-imx6.c
> > +++ b/drivers/pci/host/pci-imx6.c
> > @@ -35,9 +35,11 @@ struct imx6_pcie {
> >  	struct gpio_desc	*reset_gpio;
> >  	struct clk		*pcie_bus;
> >  	struct clk		*pcie_phy;
> > +	struct clk		*pcie_inbound_axi;
> >  	struct clk		*pcie;
> >  	struct pcie_port	pp;
> >  	struct regmap		*iomuxc_gpr;
> > +	bool			is_imx6sx;
> >  	void __iomem		*mem_base;
> >  };
> >  
> > @@ -214,35 +216,46 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
> >  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
> >  	u32 val, gpr1, gpr12;
> >  
> > -	/*
> > -	 * If the bootloader already enabled the link we need some special
> > -	 * handling to get the core back into a state where it is safe to
> > -	 * touch it for configuration.  As there is no dedicated reset signal
> > -	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
> > -	 * state before completely disabling LTSSM, which is a prerequisite
> > -	 * for core configuration.

<snip>

> > +	} else {
> > +		/*
> > +		 * If the bootloader already enabled the link we need some
> > +		 * special handling to get the core back into a state where
> > +		 * it is safe to touch it for configuration.  As there is no
> > +		 * dedicated reset signal to manually force LTSSM into "detect"
> > +		 * state before completely disabling LTSSM, which is a
> > +		 * prerequisite for core configuration.
> 
> For example, you changed this comment, and now the last sentence is no
> longer a sentence.  I don't know if this was an editing mistake or if
> this comment really does need to change.  If it does need to change,
> it needs to stay a sentence.

I suppose Richard's intend was to get rid of the explicit mentioning of
"MX6QDL".
Since I don't touch this code I'll drop this change and leave this
comment as it is.

> 
> > +		 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have
> > +		 * a strong indication that the bootloader activated the link.
> > +		 */
> > +		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
> > +		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
> > +
> > +		if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
> > +				(gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
> > +			val = readl(pp->dbi_base + PCIE_PL_PFLR);
> > +			val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
> > +			val |= PCIE_PL_PFLR_FORCE_LINK;
> > +			writel(val, pp->dbi_base + PCIE_PL_PFLR);
> > +
> > +			regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> > +				IMX6Q_GPR12_PCIE_CTL_2, 0);
> > +		}
> >  
> > -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > -			IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
> > -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > +			IMX6Q_GPR1_PCIE_TEST_PD,
> > +			IMX6Q_GPR1_PCIE_TEST_PD);
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > +			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
> 
> And there are subtle changes here (changing "1 << 18" to
> IMX6Q_GPR1_PCIE_TEST_PD, etc.)  These are fine, but should be in a
> separate patch because (a) they're not related to imx6sx and (b) it
> makes them obvious and easy to review.  As it is, they just get snuck
> in under the radar.

OK

> 
> > +	}
> >  
> >  	return 0;
> >  }
> > @@ -270,18 +283,30 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
> >  		goto err_pcie;
> >  	}
> >  
> > -	/* power up core phy and enable ref clock */
> > -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > -			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> > -	/*
> > -	 * the async reset input need ref clock to sync internally,
> > -	 * when the ref clock comes after reset, internal synced
> > -	 * reset time is too short, cannot meet the requirement.
> > -	 * add one ~10us delay here.
> > -	 */
> > -	udelay(10);
> > -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> > +	if (imx6_pcie->is_imx6sx) {
> > +		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> > +		if (ret) {
> > +			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> > +			goto err_inbound_axi;
> > +		}
> > +
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> > +			IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> > +	} else {
> > +		/* power up core phy and enable ref clock */
> > +		regmap_update_bits(imx6_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
> > +		 * reset time is too short , cannot meet the requirement.
> > +		 * add one ~10us delay here.
> > +		 */
> > +		udelay(10);
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > +			IMX6Q_GPR1_PCIE_REF_CLK_EN,
> > +			IMX6Q_GPR1_PCIE_REF_CLK_EN);
> > +	}
> 
> Here again the diff is bigger than necessary because it re-indents the
> original code (and makes another unrelated "1 << 16" to
> IMX6Q_GPR1_PCIE_REF_CLK_EN change).  I'll show a different proposal in
> my patch below.

OK

> 
> >  	/* allow the clocks to stabilize */
> >  	usleep_range(200, 500);
> > @@ -292,8 +317,15 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
> >  		msleep(100);
> >  		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
> >  	}
> > +
> > +	if (imx6_pcie->is_imx6sx)
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> > +			IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
> > +
> >  	return 0;
> >  
> > +err_inbound_axi:
> > +	clk_disable_unprepare(imx6_pcie->pcie);
> >  err_pcie:
> >  	clk_disable_unprepare(imx6_pcie->pcie_bus);
> >  err_pcie_bus:
> > @@ -307,6 +339,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
> >  {
> >  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
> >  
> > +	if (imx6_pcie->is_imx6sx) {
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> > +			IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> > +			IMX6SX_GPR12_PCIE_RX_EQ_2);
> 
> I see that you added definitions for IMX6SX_GPR12_PCIE_RX_EQ_MASK and
> IMX6SX_GPR12_PCIE_RX_EQ_2 in the first patch of this series, but doing
> that separately creates a merge problem.  I can't put this change in
> my tree by itself because it won't build.  If Lee applied the first
> patch to a git branch, I guess I could pull that into my tree.  But it
> would be far simpler to just include those new definitions in this
> patch.

Sorry, Lee Jones already applied this patch to his public git
repository:

git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git

Commit id:

 987480efd6d39447981e96b438cf5a781b756712

currently in branch for-mfd-next

Is it okay for you to pull this commit?

It's also already in linux-next.

<snip>

> The patches below are what I currently have in my tree, but they're
> not ready for v4.6 (yet).
> 
> Note that the second one is very clearly imx6sx-only.  It's obvious
> there are no tweaks to the existing imx6 code, which makes it easier
> to review, backport, bisect, revert, etc.
> 
> Obviously, I can't apply these directly.  First we have to:
> 
>   - Fix the LTSSM comment
>   - Figure out how to get the IMX6SX_GPR12_PCIE_RX_EQ_MASK definitions
> 
> 
> commit 78abf60b815a8f28207d029d61f7809647faa43a
> Author: Bjorn Helgaas <bhelgaas@google.com>
> Date:   Fri Mar 11 11:15:36 2016 -0600
> 
>     PCI: imx6: Factor out ref clock enable
>     
>     Factor out ref clock enable to make it cleaner to add imx6sx support.  No
>     functional change intended.
>     
>     Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> 
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index 8c9b389..ecc8537 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -269,6 +269,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)

<snip>

> -	udelay(10);
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
> +	if (ret)

a '{ ' is missing

> +		dev_err(pp->dev, "unable to enable pcie ref clock\n");
> +		goto err_ref_clk;
> +	}
>  
>  	/* allow the clocks to stabilize */
>  	usleep_range(200, 500);
> @@ -316,6 +326,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  	}
>  	return 0;
>  
> +err_ref_clk:
> +	clk_disable_unprepare(imx6_pcie->pcie);
>  err_pcie:
>  	clk_disable_unprepare(imx6_pcie->pcie_bus);
>  err_pcie_bus:
> 
> commit d061033570b7fd22a3ed8c029d4793e5df7324e1
> Author: Christoph Fritz <chf.fritz@googlemail.com>
> Date:   Thu Mar 10 15:04:25 2016 -0600
> 
>     PCI: imx6: Add initial imx6sx support
>     
>     Add initial PCIe support for the imx6 SoC derivate imx6sx.  PCI MSI support
>     is untested as the necessary suspend/resume quirk is not included in this
>     patch.
>     
>     This patch is heavily based on patches by Richard Zhu.
>     
>     [bhelgaas: factor out refclk enable, fix adjacent typos in fsl,imx6q-pcie.txt]
>     Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
>     Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
>     Acked-by: Lucas Stach <l.stach@pengutronix.de>
> 

<snip>

> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index ecc8537..4d6af21 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -35,9 +35,11 @@ struct imx6_pcie {
>  	struct gpio_desc	*reset_gpio;
>  	struct clk		*pcie_bus;
>  	struct clk		*pcie_phy;

<snip>

>  	/*
>  	 * If the bootloader already enabled the link we need some special
>  	 * handling to get the core back into a state where it is safe to
>  	 * touch it for configuration.  As there is no dedicated reset signal
> -	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
> -	 * state before completely disabling LTSSM, which is a prerequisite
> -	 * for core configuration.
> +	 * to manually force LTSSM into "detect" state before completely
> +	 * disabling LTSSM, which is a prerequisite for core configuration.
>  	 *
>  	 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
>  	 * indication that the bootloader activated the link.
> @@ -271,6 +283,18 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  
>  static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
>  {

this is missing:

	struct pcie_port *pp = &imx6_pcie->pp;
	int ret;




> +	if (imx6_pcie->is_imx6sx) {
> +		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> +		if (ret) {
> +			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> +			return ret;
> +		}
> +
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> +		return 0;

then we can use

	return ret;

instead
> +	}
> +
>  	/* power up core phy and enable ref clock */
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,

<snip>

I'll fix these two patches and send them as follow up to this mail.

 Thanks
  -- Christoph

[PATCH v3 2/2] PCI: imx6: add initial imx6sx support

[Christoph Fritz]

Hi Bjorn

On Fri, 2016-03-11 at 11:58 -0600, Bjorn Helgaas wrote:
> Hi Christoph (and Lee; there's a question for you below, too),

Thanks for your review, please see my answers and comments below.

> On Thu, Feb 25, 2016 at 03:47:49PM +0100, Christoph Fritz wrote:
> > This patch adds initial PCIe support for the imx6 SoC derivate imx6sx.
> > PCI_MSI support is untested as its necessary suspend/resume quirk is
> > left out of this patch.
> > This patch is heavily based on patches by Richard Zhu.
> > 
> > Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> > ---
> >  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |   6 +-
> >  drivers/pci/host/pci-imx6.c                        | 130 ++++++++++++++-------
> >  2 files changed, 96 insertions(+), 40 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > index 6fbba53..c4323be 100644
> > --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> > @@ -4,7 +4,7 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
> >  and thus inherits all the common properties defined in designware-pcie.txt.
> >  
> >  Required properties:
> > -- compatible: "fsl,imx6q-pcie"
> > +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
> >  - reg: base addresse and length of the pcie controller
> 
> I folded in a typo fix for "addresse".
> 
> >  - interrupts: A list of interrupt outputs of the controller. Must contain an
> >    entry for each entry in the interrupt-names property.
> > @@ -13,6 +13,10 @@ Required properties:
> >  - clock-names: Must include the following additional entries:
> >  	- "pcie_phy"
> >  
> > +Additional required properties for imx6sx-pcie:
> > +- clock names: Must include the following additional entries:
> > +	- "pcie_inbound_axi"
> > +
> >  Example:
> >  
> >  	pcie at 0x01000000 {
> > diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> > index fe60096..7e634a6 100644
> > --- a/drivers/pci/host/pci-imx6.c
> > +++ b/drivers/pci/host/pci-imx6.c
> > @@ -35,9 +35,11 @@ struct imx6_pcie {
> >  	struct gpio_desc	*reset_gpio;
> >  	struct clk		*pcie_bus;
> >  	struct clk		*pcie_phy;
> > +	struct clk		*pcie_inbound_axi;
> >  	struct clk		*pcie;
> >  	struct pcie_port	pp;
> >  	struct regmap		*iomuxc_gpr;
> > +	bool			is_imx6sx;
> >  	void __iomem		*mem_base;
> >  };
> >  
> > @@ -214,35 +216,46 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
> >  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
> >  	u32 val, gpr1, gpr12;
> >  
> > -	/*
> > -	 * If the bootloader already enabled the link we need some special
> > -	 * handling to get the core back into a state where it is safe to
> > -	 * touch it for configuration.  As there is no dedicated reset signal
> > -	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
> > -	 * state before completely disabling LTSSM, which is a prerequisite
> > -	 * for core configuration.

<snip>

> > +	} else {
> > +		/*
> > +		 * If the bootloader already enabled the link we need some
> > +		 * special handling to get the core back into a state where
> > +		 * it is safe to touch it for configuration.  As there is no
> > +		 * dedicated reset signal to manually force LTSSM into "detect"
> > +		 * state before completely disabling LTSSM, which is a
> > +		 * prerequisite for core configuration.
> 
> For example, you changed this comment, and now the last sentence is no
> longer a sentence.  I don't know if this was an editing mistake or if
> this comment really does need to change.  If it does need to change,
> it needs to stay a sentence.

I suppose Richard's intend was to get rid of the explicit mentioning of
"MX6QDL".
Since I don't touch this code I'll drop this change and leave this
comment as it is.

> 
> > +		 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have
> > +		 * a strong indication that the bootloader activated the link.
> > +		 */
> > +		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
> > +		regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
> > +
> > +		if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
> > +				(gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
> > +			val = readl(pp->dbi_base + PCIE_PL_PFLR);
> > +			val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
> > +			val |= PCIE_PL_PFLR_FORCE_LINK;
> > +			writel(val, pp->dbi_base + PCIE_PL_PFLR);
> > +
> > +			regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> > +				IMX6Q_GPR12_PCIE_CTL_2, 0);
> > +		}
> >  
> > -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > -			IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
> > -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > +			IMX6Q_GPR1_PCIE_TEST_PD,
> > +			IMX6Q_GPR1_PCIE_TEST_PD);
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > +			IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
> 
> And there are subtle changes here (changing "1 << 18" to
> IMX6Q_GPR1_PCIE_TEST_PD, etc.)  These are fine, but should be in a
> separate patch because (a) they're not related to imx6sx and (b) it
> makes them obvious and easy to review.  As it is, they just get snuck
> in under the radar.

OK

> 
> > +	}
> >  
> >  	return 0;
> >  }
> > @@ -270,18 +283,30 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
> >  		goto err_pcie;
> >  	}
> >  
> > -	/* power up core phy and enable ref clock */
> > -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > -			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> > -	/*
> > -	 * the async reset input need ref clock to sync internally,
> > -	 * when the ref clock comes after reset, internal synced
> > -	 * reset time is too short, cannot meet the requirement.
> > -	 * add one ~10us delay here.
> > -	 */
> > -	udelay(10);
> > -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> > +	if (imx6_pcie->is_imx6sx) {
> > +		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> > +		if (ret) {
> > +			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> > +			goto err_inbound_axi;
> > +		}
> > +
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> > +			IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> > +	} else {
> > +		/* power up core phy and enable ref clock */
> > +		regmap_update_bits(imx6_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
> > +		 * reset time is too short , cannot meet the requirement.
> > +		 * add one ~10us delay here.
> > +		 */
> > +		udelay(10);
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> > +			IMX6Q_GPR1_PCIE_REF_CLK_EN,
> > +			IMX6Q_GPR1_PCIE_REF_CLK_EN);
> > +	}
> 
> Here again the diff is bigger than necessary because it re-indents the
> original code (and makes another unrelated "1 << 16" to
> IMX6Q_GPR1_PCIE_REF_CLK_EN change).  I'll show a different proposal in
> my patch below.

OK

> 
> >  	/* allow the clocks to stabilize */
> >  	usleep_range(200, 500);
> > @@ -292,8 +317,15 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
> >  		msleep(100);
> >  		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
> >  	}
> > +
> > +	if (imx6_pcie->is_imx6sx)
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> > +			IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
> > +
> >  	return 0;
> >  
> > +err_inbound_axi:
> > +	clk_disable_unprepare(imx6_pcie->pcie);
> >  err_pcie:
> >  	clk_disable_unprepare(imx6_pcie->pcie_bus);
> >  err_pcie_bus:
> > @@ -307,6 +339,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
> >  {
> >  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
> >  
> > +	if (imx6_pcie->is_imx6sx) {
> > +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> > +			IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> > +			IMX6SX_GPR12_PCIE_RX_EQ_2);
> 
> I see that you added definitions for IMX6SX_GPR12_PCIE_RX_EQ_MASK and
> IMX6SX_GPR12_PCIE_RX_EQ_2 in the first patch of this series, but doing
> that separately creates a merge problem.  I can't put this change in
> my tree by itself because it won't build.  If Lee applied the first
> patch to a git branch, I guess I could pull that into my tree.  But it
> would be far simpler to just include those new definitions in this
> patch.

Sorry, Lee Jones already applied this patch to his public git
repository:

git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git

Commit id:

 987480efd6d39447981e96b438cf5a781b756712

currently in branch for-mfd-next

Is it okay for you to pull this commit?

It's also already in linux-next.

<snip>

> The patches below are what I currently have in my tree, but they're
> not ready for v4.6 (yet).
> 
> Note that the second one is very clearly imx6sx-only.  It's obvious
> there are no tweaks to the existing imx6 code, which makes it easier
> to review, backport, bisect, revert, etc.
> 
> Obviously, I can't apply these directly.  First we have to:
> 
>   - Fix the LTSSM comment
>   - Figure out how to get the IMX6SX_GPR12_PCIE_RX_EQ_MASK definitions
> 
> 
> commit 78abf60b815a8f28207d029d61f7809647faa43a
> Author: Bjorn Helgaas <bhelgaas@google.com>
> Date:   Fri Mar 11 11:15:36 2016 -0600
> 
>     PCI: imx6: Factor out ref clock enable
>     
>     Factor out ref clock enable to make it cleaner to add imx6sx support.  No
>     functional change intended.
>     
>     Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> 
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index 8c9b389..ecc8537 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -269,6 +269,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)

<snip>

> -	udelay(10);
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
> +	if (ret)

a '{ ' is missing

> +		dev_err(pp->dev, "unable to enable pcie ref clock\n");
> +		goto err_ref_clk;
> +	}
>  
>  	/* allow the clocks to stabilize */
>  	usleep_range(200, 500);
> @@ -316,6 +326,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  	}
>  	return 0;
>  
> +err_ref_clk:
> +	clk_disable_unprepare(imx6_pcie->pcie);
>  err_pcie:
>  	clk_disable_unprepare(imx6_pcie->pcie_bus);
>  err_pcie_bus:
> 
> commit d061033570b7fd22a3ed8c029d4793e5df7324e1
> Author: Christoph Fritz <chf.fritz@googlemail.com>
> Date:   Thu Mar 10 15:04:25 2016 -0600
> 
>     PCI: imx6: Add initial imx6sx support
>     
>     Add initial PCIe support for the imx6 SoC derivate imx6sx.  PCI MSI support
>     is untested as the necessary suspend/resume quirk is not included in this
>     patch.
>     
>     This patch is heavily based on patches by Richard Zhu.
>     
>     [bhelgaas: factor out refclk enable, fix adjacent typos in fsl,imx6q-pcie.txt]
>     Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
>     Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
>     Acked-by: Lucas Stach <l.stach@pengutronix.de>
> 

<snip>

> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index ecc8537..4d6af21 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -35,9 +35,11 @@ struct imx6_pcie {
>  	struct gpio_desc	*reset_gpio;
>  	struct clk		*pcie_bus;
>  	struct clk		*pcie_phy;

<snip>

>  	/*
>  	 * If the bootloader already enabled the link we need some special
>  	 * handling to get the core back into a state where it is safe to
>  	 * touch it for configuration.  As there is no dedicated reset signal
> -	 * wired up for MX6QDL, we need to manually force LTSSM into "detect"
> -	 * state before completely disabling LTSSM, which is a prerequisite
> -	 * for core configuration.
> +	 * to manually force LTSSM into "detect" state before completely
> +	 * disabling LTSSM, which is a prerequisite for core configuration.
>  	 *
>  	 * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
>  	 * indication that the bootloader activated the link.
> @@ -271,6 +283,18 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  
>  static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
>  {

this is missing:

	struct pcie_port *pp = &imx6_pcie->pp;
	int ret;




> +	if (imx6_pcie->is_imx6sx) {
> +		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> +		if (ret) {
> +			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> +			return ret;
> +		}
> +
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> +		return 0;

then we can use

	return ret;

instead
> +	}
> +
>  	/* power up core phy and enable ref clock */
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,

<snip>

I'll fix these two patches and send them as follow up to this mail.

 Thanks
  -- Christoph

PCI: imx6: Factor out ref clock enable

[Christoph Fritz]

commit dfcc1a16e6954e8ca6cadfc9dd309db6b6ef46b2
Author: Bjorn Helgaas <bhelgaas@google.com>
Date: Fri, 11 Mar 2016 11:15:36 -0600

Factor out ref clock enable to make it cleaner to add imx6sx support.  No
functional change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Christoph Fritz <chf.fritz@googlemail.com>
---
 drivers/pci/host/pci-imx6.c | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index bd3f7d0..4e0e47f 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -264,6 +264,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 	return 0;
 }
 
+static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
+{
+	/* power up core phy and enable ref clock */
+	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
+	/*
+	 * the async reset input need ref clock to sync internally,
+	 * when the ref clock comes after reset, internal synced
+	 * reset time is too short, cannot meet the requirement.
+	 * add one ~10us delay here.
+	 */
+	udelay(10);
+	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+	return 0;
+}
+
 static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 {
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
@@ -287,18 +304,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		goto err_pcie;
 	}
 
-	/* power up core phy and enable ref clock */
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
-	/*
-	 * the async reset input need ref clock to sync internally,
-	 * when the ref clock comes after reset, internal synced
-	 * reset time is too short, cannot meet the requirement.
-	 * add one ~10us delay here.
-	 */
-	udelay(10);
-	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
-			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
+	if (ret) {
+		dev_err(pp->dev, "unable to enable pcie ref clock\n");
+		goto err_ref_clk;
+	}
 
 	/* allow the clocks to stabilize */
 	usleep_range(200, 500);
@@ -311,6 +321,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 	}
 	return 0;
 
+err_ref_clk:
+	clk_disable_unprepare(imx6_pcie->pcie);
 err_pcie:
 	clk_disable_unprepare(imx6_pcie->pcie_bus);
 err_pcie_bus:
-- 
2.1.4

[PATCH v4] PCI: imx6: Add initial imx6sx support

[Christoph Fritz]

Add initial PCIe support for the imx6 SoC derivate imx6sx.  PCI MSI support
is untested as the necessary suspend/resume quirk is not included in this
patch.

This patch is heavily based on patches by Richard Zhu.

[bhelgaas: factor out refclk enable, fix adjacent typos in imx6q-pcie.txt]
Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
Acked-by: Lucas Stach <l.stach@pengutronix.de>
---
 .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |  8 +++-
 drivers/pci/host/pci-imx6.c                        | 53 ++++++++++++++++++++++
 2 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index 6fbba53..6ee4439 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -4,8 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
 and thus inherits all the common properties defined in designware-pcie.txt.
 
 Required properties:
-- compatible: "fsl,imx6q-pcie"
-- reg: base addresse and length of the pcie controller
+- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
+- reg: base address and length of the PCIe controller
 - interrupts: A list of interrupt outputs of the controller. Must contain an
   entry for each entry in the interrupt-names property.
 - interrupt-names: Must include the following entries:
@@ -13,6 +13,10 @@ Required properties:
 - clock-names: Must include the following additional entries:
 	- "pcie_phy"
 
+Additional required properties for imx6sx-pcie:
+- clock names: Must include the following additional entries:
+	- "pcie_inbound_axi"
+
 Example:
 
 	pcie@0x01000000 {
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 4e0e47f..fa3a544 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -35,9 +35,11 @@ struct imx6_pcie {
 	struct gpio_desc	*reset_gpio;
 	struct clk		*pcie_bus;
 	struct clk		*pcie_phy;
+	struct clk		*pcie_inbound_axi;
 	struct clk		*pcie;
 	struct pcie_port	pp;
 	struct regmap		*iomuxc_gpr;
+	bool			is_imx6sx;
 	void __iomem		*mem_base;
 };
 
@@ -231,6 +233,17 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 	u32 val, gpr1, gpr12;
 
+	if (imx6_pcie->is_imx6sx) {
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
+		/* Force PCIe PHY reset */
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET);
+		return 0;
+	}
+
 	/*
 	 * If the bootloader already enabled the link we need some special
 	 * handling to get the core back into a state where it is safe to
@@ -266,6 +279,21 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 
 static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 {
+	struct pcie_port *pp = &imx6_pcie->pp;
+	int ret;
+
+	if (imx6_pcie->is_imx6sx) {
+		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
+		if (ret) {
+			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
+			return ret;
+		}
+
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
+		return ret;
+	}
+
 	/* power up core phy and enable ref clock */
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
 			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
@@ -319,6 +347,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		msleep(100);
 		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
 	}
+
+	if (imx6_pcie->is_imx6sx)
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
+
 	return 0;
 
 err_ref_clk:
@@ -336,6 +369,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
 {
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 
+	if (imx6_pcie->is_imx6sx) {
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_RX_EQ_MASK,
+				   IMX6SX_GPR12_PCIE_RX_EQ_2);
+	}
+
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
 
@@ -554,6 +593,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 	pp = &imx6_pcie->pp;
 	pp->dev = &pdev->dev;
 
+	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
+						       "fsl,imx6sx-pcie");
+
 	/* Added for PCI abort handling */
 	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
 		"imprecise external abort");
@@ -589,6 +631,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(imx6_pcie->pcie);
 	}
 
+	if (imx6_pcie->is_imx6sx) {
+		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
+							   "pcie_inbound_axi");
+		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
+			dev_err(&pdev->dev,
+				"pcie_incbound_axi clock missing or invalid\n");
+			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
+		}
+	}
+
 	/* Grab GPR config register range */
 	imx6_pcie->iomuxc_gpr =
 		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
@@ -615,6 +667,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
 
 static const struct of_device_id imx6_pcie_of_match[] = {
 	{ .compatible = "fsl,imx6q-pcie", },
+	{ .compatible = "fsl,imx6sx-pcie", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
-- 
2.1.4

[PATCH v4] PCI: imx6: Add initial imx6sx support

[Christoph Fritz]

Add initial PCIe support for the imx6 SoC derivate imx6sx.  PCI MSI support
is untested as the necessary suspend/resume quirk is not included in this
patch.

This patch is heavily based on patches by Richard Zhu.

[bhelgaas: factor out refclk enable, fix adjacent typos in imx6q-pcie.txt]
Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
Acked-by: Lucas Stach <l.stach@pengutronix.de>
---
 .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |  8 +++-
 drivers/pci/host/pci-imx6.c                        | 53 ++++++++++++++++++++++
 2 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index 6fbba53..6ee4439 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -4,8 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
 and thus inherits all the common properties defined in designware-pcie.txt.
 
 Required properties:
-- compatible: "fsl,imx6q-pcie"
-- reg: base addresse and length of the pcie controller
+- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
+- reg: base address and length of the PCIe controller
 - interrupts: A list of interrupt outputs of the controller. Must contain an
   entry for each entry in the interrupt-names property.
 - interrupt-names: Must include the following entries:
@@ -13,6 +13,10 @@ Required properties:
 - clock-names: Must include the following additional entries:
 	- "pcie_phy"
 
+Additional required properties for imx6sx-pcie:
+- clock names: Must include the following additional entries:
+	- "pcie_inbound_axi"
+
 Example:
 
 	pcie at 0x01000000 {
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 4e0e47f..fa3a544 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -35,9 +35,11 @@ struct imx6_pcie {
 	struct gpio_desc	*reset_gpio;
 	struct clk		*pcie_bus;
 	struct clk		*pcie_phy;
+	struct clk		*pcie_inbound_axi;
 	struct clk		*pcie;
 	struct pcie_port	pp;
 	struct regmap		*iomuxc_gpr;
+	bool			is_imx6sx;
 	void __iomem		*mem_base;
 };
 
@@ -231,6 +233,17 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 	u32 val, gpr1, gpr12;
 
+	if (imx6_pcie->is_imx6sx) {
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
+		/* Force PCIe PHY reset */
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET);
+		return 0;
+	}
+
 	/*
 	 * If the bootloader already enabled the link we need some special
 	 * handling to get the core back into a state where it is safe to
@@ -266,6 +279,21 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
 
 static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 {
+	struct pcie_port *pp = &imx6_pcie->pp;
+	int ret;
+
+	if (imx6_pcie->is_imx6sx) {
+		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
+		if (ret) {
+			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
+			return ret;
+		}
+
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
+		return ret;
+	}
+
 	/* power up core phy and enable ref clock */
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
 			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
@@ -319,6 +347,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 		msleep(100);
 		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
 	}
+
+	if (imx6_pcie->is_imx6sx)
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+				   IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
+
 	return 0;
 
 err_ref_clk:
@@ -336,6 +369,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
 {
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
 
+	if (imx6_pcie->is_imx6sx) {
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				   IMX6SX_GPR12_PCIE_RX_EQ_MASK,
+				   IMX6SX_GPR12_PCIE_RX_EQ_2);
+	}
+
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
 
@@ -554,6 +593,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 	pp = &imx6_pcie->pp;
 	pp->dev = &pdev->dev;
 
+	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
+						       "fsl,imx6sx-pcie");
+
 	/* Added for PCI abort handling */
 	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
 		"imprecise external abort");
@@ -589,6 +631,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(imx6_pcie->pcie);
 	}
 
+	if (imx6_pcie->is_imx6sx) {
+		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
+							   "pcie_inbound_axi");
+		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
+			dev_err(&pdev->dev,
+				"pcie_incbound_axi clock missing or invalid\n");
+			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
+		}
+	}
+
 	/* Grab GPR config register range */
 	imx6_pcie->iomuxc_gpr =
 		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
@@ -615,6 +667,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
 
 static const struct of_device_id imx6_pcie_of_match[] = {
 	{ .compatible = "fsl,imx6q-pcie", },
+	{ .compatible = "fsl,imx6sx-pcie", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
-- 
2.1.4

Re: PCI: imx6: Factor out ref clock enable

[Christoph Fritz]

*ping*

On Mon, 2016-03-14 at 00:30 +0100, Christoph Fritz wrote:
> commit dfcc1a16e6954e8ca6cadfc9dd309db6b6ef46b2
> Author: Bjorn Helgaas <bhelgaas@google.com>
> Date: Fri, 11 Mar 2016 11:15:36 -0600
> 
> Factor out ref clock enable to make it cleaner to add imx6sx support.  No
> functional change intended.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> Tested-by: Christoph Fritz <chf.fritz@googlemail.com>
> ---
>  drivers/pci/host/pci-imx6.c | 36 ++++++++++++++++++++++++------------
>  1 file changed, 24 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index bd3f7d0..4e0e47f 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -264,6 +264,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  	return 0;
>  }
>  
> +static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
> +{
> +	/* power up core phy and enable ref clock */
> +	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> +	/*
> +	 * the async reset input need ref clock to sync internally,
> +	 * when the ref clock comes after reset, internal synced
> +	 * reset time is too short, cannot meet the requirement.
> +	 * add one ~10us delay here.
> +	 */
> +	udelay(10);
> +	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	return 0;
> +}
> +
>  static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  {
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
> @@ -287,18 +304,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		goto err_pcie;
>  	}
>  
> -	/* power up core phy and enable ref clock */
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> -	/*
> -	 * the async reset input need ref clock to sync internally,
> -	 * when the ref clock comes after reset, internal synced
> -	 * reset time is too short, cannot meet the requirement.
> -	 * add one ~10us delay here.
> -	 */
> -	udelay(10);
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
> +	if (ret) {
> +		dev_err(pp->dev, "unable to enable pcie ref clock\n");
> +		goto err_ref_clk;
> +	}
>  
>  	/* allow the clocks to stabilize */
>  	usleep_range(200, 500);
> @@ -311,6 +321,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  	}
>  	return 0;
>  
> +err_ref_clk:
> +	clk_disable_unprepare(imx6_pcie->pcie);
>  err_pcie:
>  	clk_disable_unprepare(imx6_pcie->pcie_bus);
>  err_pcie_bus:

PCI: imx6: Factor out ref clock enable

[Christoph Fritz]

*ping*

On Mon, 2016-03-14 at 00:30 +0100, Christoph Fritz wrote:
> commit dfcc1a16e6954e8ca6cadfc9dd309db6b6ef46b2
> Author: Bjorn Helgaas <bhelgaas@google.com>
> Date: Fri, 11 Mar 2016 11:15:36 -0600
> 
> Factor out ref clock enable to make it cleaner to add imx6sx support.  No
> functional change intended.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> Tested-by: Christoph Fritz <chf.fritz@googlemail.com>
> ---
>  drivers/pci/host/pci-imx6.c | 36 ++++++++++++++++++++++++------------
>  1 file changed, 24 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index bd3f7d0..4e0e47f 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -264,6 +264,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  	return 0;
>  }
>  
> +static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
> +{
> +	/* power up core phy and enable ref clock */
> +	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> +	/*
> +	 * the async reset input need ref clock to sync internally,
> +	 * when the ref clock comes after reset, internal synced
> +	 * reset time is too short, cannot meet the requirement.
> +	 * add one ~10us delay here.
> +	 */
> +	udelay(10);
> +	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	return 0;
> +}
> +
>  static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  {
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
> @@ -287,18 +304,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		goto err_pcie;
>  	}
>  
> -	/* power up core phy and enable ref clock */
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> -	/*
> -	 * the async reset input need ref clock to sync internally,
> -	 * when the ref clock comes after reset, internal synced
> -	 * reset time is too short, cannot meet the requirement.
> -	 * add one ~10us delay here.
> -	 */
> -	udelay(10);
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
> +	if (ret) {
> +		dev_err(pp->dev, "unable to enable pcie ref clock\n");
> +		goto err_ref_clk;
> +	}
>  
>  	/* allow the clocks to stabilize */
>  	usleep_range(200, 500);
> @@ -311,6 +321,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  	}
>  	return 0;
>  
> +err_ref_clk:
> +	clk_disable_unprepare(imx6_pcie->pcie);
>  err_pcie:
>  	clk_disable_unprepare(imx6_pcie->pcie_bus);
>  err_pcie_bus:

Re: [PATCH v4] PCI: imx6: Add initial imx6sx support

[Christoph Fritz]

*ping*

On Mon, 2016-03-14 at 00:31 +0100, Christoph Fritz wrote:
> Add initial PCIe support for the imx6 SoC derivate imx6sx.  PCI MSI support
> is untested as the necessary suspend/resume quirk is not included in this
> patch.
> 
> This patch is heavily based on patches by Richard Zhu.
> 
> [bhelgaas: factor out refclk enable, fix adjacent typos in imx6q-pcie.txt]
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
> Acked-by: Lucas Stach <l.stach@pengutronix.de>
> ---
>  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |  8 +++-
>  drivers/pci/host/pci-imx6.c                        | 53 ++++++++++++++++++++++
>  2 files changed, 59 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> index 6fbba53..6ee4439 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> @@ -4,8 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
>  and thus inherits all the common properties defined in designware-pcie.txt.
>  
>  Required properties:
> -- compatible: "fsl,imx6q-pcie"
> -- reg: base addresse and length of the pcie controller
> +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
> +- reg: base address and length of the PCIe controller
>  - interrupts: A list of interrupt outputs of the controller. Must contain an
>    entry for each entry in the interrupt-names property.
>  - interrupt-names: Must include the following entries:
> @@ -13,6 +13,10 @@ Required properties:
>  - clock-names: Must include the following additional entries:
>  	- "pcie_phy"
>  
> +Additional required properties for imx6sx-pcie:
> +- clock names: Must include the following additional entries:
> +	- "pcie_inbound_axi"
> +
>  Example:
>  
>  	pcie@0x01000000 {
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index 4e0e47f..fa3a544 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -35,9 +35,11 @@ struct imx6_pcie {
>  	struct gpio_desc	*reset_gpio;
>  	struct clk		*pcie_bus;
>  	struct clk		*pcie_phy;
> +	struct clk		*pcie_inbound_axi;
>  	struct clk		*pcie;
>  	struct pcie_port	pp;
>  	struct regmap		*iomuxc_gpr;
> +	bool			is_imx6sx;
>  	void __iomem		*mem_base;
>  };
>  
> @@ -231,6 +233,17 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  	u32 val, gpr1, gpr12;
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
> +		/* Force PCIe PHY reset */
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET);
> +		return 0;
> +	}
> +
>  	/*
>  	 * If the bootloader already enabled the link we need some special
>  	 * handling to get the core back into a state where it is safe to
> @@ -266,6 +279,21 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  
>  static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
>  {
> +	struct pcie_port *pp = &imx6_pcie->pp;
> +	int ret;
> +
> +	if (imx6_pcie->is_imx6sx) {
> +		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> +		if (ret) {
> +			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> +			return ret;
> +		}
> +
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> +		return ret;
> +	}
> +
>  	/* power up core phy and enable ref clock */
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
>  			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> @@ -319,6 +347,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		msleep(100);
>  		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
>  	}
> +
> +	if (imx6_pcie->is_imx6sx)
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
> +
>  	return 0;
>  
>  err_ref_clk:
> @@ -336,6 +369,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
>  {
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> +				   IMX6SX_GPR12_PCIE_RX_EQ_2);
> +	}
> +
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
>  
> @@ -554,6 +593,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  	pp = &imx6_pcie->pp;
>  	pp->dev = &pdev->dev;
>  
> +	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
> +						       "fsl,imx6sx-pcie");
> +
>  	/* Added for PCI abort handling */
>  	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
>  		"imprecise external abort");
> @@ -589,6 +631,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  		return PTR_ERR(imx6_pcie->pcie);
>  	}
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
> +							   "pcie_inbound_axi");
> +		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
> +			dev_err(&pdev->dev,
> +				"pcie_incbound_axi clock missing or invalid\n");
> +			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
> +		}
> +	}
> +
>  	/* Grab GPR config register range */
>  	imx6_pcie->iomuxc_gpr =
>  		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
> @@ -615,6 +667,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
>  
>  static const struct of_device_id imx6_pcie_of_match[] = {
>  	{ .compatible = "fsl,imx6q-pcie", },
> +	{ .compatible = "fsl,imx6sx-pcie", },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);

[PATCH v4] PCI: imx6: Add initial imx6sx support

[Christoph Fritz]

*ping*

On Mon, 2016-03-14 at 00:31 +0100, Christoph Fritz wrote:
> Add initial PCIe support for the imx6 SoC derivate imx6sx.  PCI MSI support
> is untested as the necessary suspend/resume quirk is not included in this
> patch.
> 
> This patch is heavily based on patches by Richard Zhu.
> 
> [bhelgaas: factor out refclk enable, fix adjacent typos in imx6q-pcie.txt]
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
> Acked-by: Lucas Stach <l.stach@pengutronix.de>
> ---
>  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |  8 +++-
>  drivers/pci/host/pci-imx6.c                        | 53 ++++++++++++++++++++++
>  2 files changed, 59 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> index 6fbba53..6ee4439 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> @@ -4,8 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
>  and thus inherits all the common properties defined in designware-pcie.txt.
>  
>  Required properties:
> -- compatible: "fsl,imx6q-pcie"
> -- reg: base addresse and length of the pcie controller
> +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
> +- reg: base address and length of the PCIe controller
>  - interrupts: A list of interrupt outputs of the controller. Must contain an
>    entry for each entry in the interrupt-names property.
>  - interrupt-names: Must include the following entries:
> @@ -13,6 +13,10 @@ Required properties:
>  - clock-names: Must include the following additional entries:
>  	- "pcie_phy"
>  
> +Additional required properties for imx6sx-pcie:
> +- clock names: Must include the following additional entries:
> +	- "pcie_inbound_axi"
> +
>  Example:
>  
>  	pcie at 0x01000000 {
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index 4e0e47f..fa3a544 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -35,9 +35,11 @@ struct imx6_pcie {
>  	struct gpio_desc	*reset_gpio;
>  	struct clk		*pcie_bus;
>  	struct clk		*pcie_phy;
> +	struct clk		*pcie_inbound_axi;
>  	struct clk		*pcie;
>  	struct pcie_port	pp;
>  	struct regmap		*iomuxc_gpr;
> +	bool			is_imx6sx;
>  	void __iomem		*mem_base;
>  };
>  
> @@ -231,6 +233,17 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  	u32 val, gpr1, gpr12;
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
> +		/* Force PCIe PHY reset */
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET);
> +		return 0;
> +	}
> +
>  	/*
>  	 * If the bootloader already enabled the link we need some special
>  	 * handling to get the core back into a state where it is safe to
> @@ -266,6 +279,21 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  
>  static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
>  {
> +	struct pcie_port *pp = &imx6_pcie->pp;
> +	int ret;
> +
> +	if (imx6_pcie->is_imx6sx) {
> +		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> +		if (ret) {
> +			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> +			return ret;
> +		}
> +
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> +		return ret;
> +	}
> +
>  	/* power up core phy and enable ref clock */
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
>  			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> @@ -319,6 +347,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		msleep(100);
>  		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
>  	}
> +
> +	if (imx6_pcie->is_imx6sx)
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
> +
>  	return 0;
>  
>  err_ref_clk:
> @@ -336,6 +369,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
>  {
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> +				   IMX6SX_GPR12_PCIE_RX_EQ_2);
> +	}
> +
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
>  
> @@ -554,6 +593,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  	pp = &imx6_pcie->pp;
>  	pp->dev = &pdev->dev;
>  
> +	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
> +						       "fsl,imx6sx-pcie");
> +
>  	/* Added for PCI abort handling */
>  	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
>  		"imprecise external abort");
> @@ -589,6 +631,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  		return PTR_ERR(imx6_pcie->pcie);
>  	}
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
> +							   "pcie_inbound_axi");
> +		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
> +			dev_err(&pdev->dev,
> +				"pcie_incbound_axi clock missing or invalid\n");
> +			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
> +		}
> +	}
> +
>  	/* Grab GPR config register range */
>  	imx6_pcie->iomuxc_gpr =
>  		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
> @@ -615,6 +667,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
>  
>  static const struct of_device_id imx6_pcie_of_match[] = {
>  	{ .compatible = "fsl,imx6q-pcie", },
> +	{ .compatible = "fsl,imx6sx-pcie", },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);

Re: PCI: imx6: Factor out ref clock enable

[Bjorn Helgaas]

Hi Christoph,

On Mon, Mar 14, 2016 at 12:30:55AM +0100, Christoph Fritz wrote:
> commit dfcc1a16e6954e8ca6cadfc9dd309db6b6ef46b2
> Author: Bjorn Helgaas <bhelgaas@google.com>
> Date: Fri, 11 Mar 2016 11:15:36 -0600
> 
> Factor out ref clock enable to make it cleaner to add imx6sx support.  No
> functional change intended.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> Tested-by: Christoph Fritz <chf.fritz@googlemail.com>

Applied to pci/host-imx6 for v4.7, thanks!

> ---
>  drivers/pci/host/pci-imx6.c | 36 ++++++++++++++++++++++++------------
>  1 file changed, 24 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index bd3f7d0..4e0e47f 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -264,6 +264,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  	return 0;
>  }
>  
> +static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
> +{
> +	/* power up core phy and enable ref clock */
> +	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> +	/*
> +	 * the async reset input need ref clock to sync internally,
> +	 * when the ref clock comes after reset, internal synced
> +	 * reset time is too short, cannot meet the requirement.
> +	 * add one ~10us delay here.
> +	 */
> +	udelay(10);
> +	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	return 0;
> +}
> +
>  static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  {
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
> @@ -287,18 +304,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		goto err_pcie;
>  	}
>  
> -	/* power up core phy and enable ref clock */
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> -	/*
> -	 * the async reset input need ref clock to sync internally,
> -	 * when the ref clock comes after reset, internal synced
> -	 * reset time is too short, cannot meet the requirement.
> -	 * add one ~10us delay here.
> -	 */
> -	udelay(10);
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
> +	if (ret) {
> +		dev_err(pp->dev, "unable to enable pcie ref clock\n");
> +		goto err_ref_clk;
> +	}
>  
>  	/* allow the clocks to stabilize */
>  	usleep_range(200, 500);
> @@ -311,6 +321,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  	}
>  	return 0;
>  
> +err_ref_clk:
> +	clk_disable_unprepare(imx6_pcie->pcie);
>  err_pcie:
>  	clk_disable_unprepare(imx6_pcie->pcie_bus);
>  err_pcie_bus:
> -- 
> 2.1.4
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

PCI: imx6: Factor out ref clock enable

[Bjorn Helgaas]

Hi Christoph,

On Mon, Mar 14, 2016 at 12:30:55AM +0100, Christoph Fritz wrote:
> commit dfcc1a16e6954e8ca6cadfc9dd309db6b6ef46b2
> Author: Bjorn Helgaas <bhelgaas@google.com>
> Date: Fri, 11 Mar 2016 11:15:36 -0600
> 
> Factor out ref clock enable to make it cleaner to add imx6sx support.  No
> functional change intended.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> Tested-by: Christoph Fritz <chf.fritz@googlemail.com>

Applied to pci/host-imx6 for v4.7, thanks!

> ---
>  drivers/pci/host/pci-imx6.c | 36 ++++++++++++++++++++++++------------
>  1 file changed, 24 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index bd3f7d0..4e0e47f 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -264,6 +264,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  	return 0;
>  }
>  
> +static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
> +{
> +	/* power up core phy and enable ref clock */
> +	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> +	/*
> +	 * the async reset input need ref clock to sync internally,
> +	 * when the ref clock comes after reset, internal synced
> +	 * reset time is too short, cannot meet the requirement.
> +	 * add one ~10us delay here.
> +	 */
> +	udelay(10);
> +	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	return 0;
> +}
> +
>  static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  {
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
> @@ -287,18 +304,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		goto err_pcie;
>  	}
>  
> -	/* power up core phy and enable ref clock */
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> -	/*
> -	 * the async reset input need ref clock to sync internally,
> -	 * when the ref clock comes after reset, internal synced
> -	 * reset time is too short, cannot meet the requirement.
> -	 * add one ~10us delay here.
> -	 */
> -	udelay(10);
> -	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -			IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> +	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
> +	if (ret) {
> +		dev_err(pp->dev, "unable to enable pcie ref clock\n");
> +		goto err_ref_clk;
> +	}
>  
>  	/* allow the clocks to stabilize */
>  	usleep_range(200, 500);
> @@ -311,6 +321,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  	}
>  	return 0;
>  
> +err_ref_clk:
> +	clk_disable_unprepare(imx6_pcie->pcie);
>  err_pcie:
>  	clk_disable_unprepare(imx6_pcie->pcie_bus);
>  err_pcie_bus:
> -- 
> 2.1.4
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo at vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH v4] PCI: imx6: Add initial imx6sx support

[Bjorn Helgaas]

On Mon, Mar 14, 2016 at 12:31:10AM +0100, Christoph Fritz wrote:
> Add initial PCIe support for the imx6 SoC derivate imx6sx.  PCI MSI support
> is untested as the necessary suspend/resume quirk is not included in this
> patch.
> 
> This patch is heavily based on patches by Richard Zhu.
> 
> [bhelgaas: factor out refclk enable, fix adjacent typos in imx6q-pcie.txt]
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
> Acked-by: Lucas Stach <l.stach@pengutronix.de>

Applied to pci/host-imx6 for v4.7, thanks!

> ---
>  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |  8 +++-
>  drivers/pci/host/pci-imx6.c                        | 53 ++++++++++++++++++++++
>  2 files changed, 59 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> index 6fbba53..6ee4439 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> @@ -4,8 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
>  and thus inherits all the common properties defined in designware-pcie.txt.
>  
>  Required properties:
> -- compatible: "fsl,imx6q-pcie"
> -- reg: base addresse and length of the pcie controller
> +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
> +- reg: base address and length of the PCIe controller
>  - interrupts: A list of interrupt outputs of the controller. Must contain an
>    entry for each entry in the interrupt-names property.
>  - interrupt-names: Must include the following entries:
> @@ -13,6 +13,10 @@ Required properties:
>  - clock-names: Must include the following additional entries:
>  	- "pcie_phy"
>  
> +Additional required properties for imx6sx-pcie:
> +- clock names: Must include the following additional entries:
> +	- "pcie_inbound_axi"
> +
>  Example:
>  
>  	pcie@0x01000000 {
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index 4e0e47f..fa3a544 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -35,9 +35,11 @@ struct imx6_pcie {
>  	struct gpio_desc	*reset_gpio;
>  	struct clk		*pcie_bus;
>  	struct clk		*pcie_phy;
> +	struct clk		*pcie_inbound_axi;
>  	struct clk		*pcie;
>  	struct pcie_port	pp;
>  	struct regmap		*iomuxc_gpr;
> +	bool			is_imx6sx;
>  	void __iomem		*mem_base;
>  };
>  
> @@ -231,6 +233,17 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  	u32 val, gpr1, gpr12;
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
> +		/* Force PCIe PHY reset */
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET);
> +		return 0;
> +	}
> +
>  	/*
>  	 * If the bootloader already enabled the link we need some special
>  	 * handling to get the core back into a state where it is safe to
> @@ -266,6 +279,21 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  
>  static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
>  {
> +	struct pcie_port *pp = &imx6_pcie->pp;
> +	int ret;
> +
> +	if (imx6_pcie->is_imx6sx) {
> +		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> +		if (ret) {
> +			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> +			return ret;
> +		}
> +
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> +		return ret;
> +	}
> +
>  	/* power up core phy and enable ref clock */
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
>  			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> @@ -319,6 +347,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		msleep(100);
>  		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
>  	}
> +
> +	if (imx6_pcie->is_imx6sx)
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
> +
>  	return 0;
>  
>  err_ref_clk:
> @@ -336,6 +369,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
>  {
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> +				   IMX6SX_GPR12_PCIE_RX_EQ_2);
> +	}
> +
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
>  
> @@ -554,6 +593,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  	pp = &imx6_pcie->pp;
>  	pp->dev = &pdev->dev;
>  
> +	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
> +						       "fsl,imx6sx-pcie");
> +
>  	/* Added for PCI abort handling */
>  	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
>  		"imprecise external abort");
> @@ -589,6 +631,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  		return PTR_ERR(imx6_pcie->pcie);
>  	}
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
> +							   "pcie_inbound_axi");
> +		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
> +			dev_err(&pdev->dev,
> +				"pcie_incbound_axi clock missing or invalid\n");
> +			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
> +		}
> +	}
> +
>  	/* Grab GPR config register range */
>  	imx6_pcie->iomuxc_gpr =
>  		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
> @@ -615,6 +667,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
>  
>  static const struct of_device_id imx6_pcie_of_match[] = {
>  	{ .compatible = "fsl,imx6q-pcie", },
> +	{ .compatible = "fsl,imx6sx-pcie", },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
> -- 
> 2.1.4
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

[PATCH v4] PCI: imx6: Add initial imx6sx support

[Bjorn Helgaas]

On Mon, Mar 14, 2016 at 12:31:10AM +0100, Christoph Fritz wrote:
> Add initial PCIe support for the imx6 SoC derivate imx6sx.  PCI MSI support
> is untested as the necessary suspend/resume quirk is not included in this
> patch.
> 
> This patch is heavily based on patches by Richard Zhu.
> 
> [bhelgaas: factor out refclk enable, fix adjacent typos in imx6q-pcie.txt]
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
> Acked-by: Lucas Stach <l.stach@pengutronix.de>

Applied to pci/host-imx6 for v4.7, thanks!

> ---
>  .../devicetree/bindings/pci/fsl,imx6q-pcie.txt     |  8 +++-
>  drivers/pci/host/pci-imx6.c                        | 53 ++++++++++++++++++++++
>  2 files changed, 59 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> index 6fbba53..6ee4439 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> @@ -4,8 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
>  and thus inherits all the common properties defined in designware-pcie.txt.
>  
>  Required properties:
> -- compatible: "fsl,imx6q-pcie"
> -- reg: base addresse and length of the pcie controller
> +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
> +- reg: base address and length of the PCIe controller
>  - interrupts: A list of interrupt outputs of the controller. Must contain an
>    entry for each entry in the interrupt-names property.
>  - interrupt-names: Must include the following entries:
> @@ -13,6 +13,10 @@ Required properties:
>  - clock-names: Must include the following additional entries:
>  	- "pcie_phy"
>  
> +Additional required properties for imx6sx-pcie:
> +- clock names: Must include the following additional entries:
> +	- "pcie_inbound_axi"
> +
>  Example:
>  
>  	pcie at 0x01000000 {
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index 4e0e47f..fa3a544 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -35,9 +35,11 @@ struct imx6_pcie {
>  	struct gpio_desc	*reset_gpio;
>  	struct clk		*pcie_bus;
>  	struct clk		*pcie_phy;
> +	struct clk		*pcie_inbound_axi;
>  	struct clk		*pcie;
>  	struct pcie_port	pp;
>  	struct regmap		*iomuxc_gpr;
> +	bool			is_imx6sx;
>  	void __iomem		*mem_base;
>  };
>  
> @@ -231,6 +233,17 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  	u32 val, gpr1, gpr12;
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
> +		/* Force PCIe PHY reset */
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET);
> +		return 0;
> +	}
> +
>  	/*
>  	 * If the bootloader already enabled the link we need some special
>  	 * handling to get the core back into a state where it is safe to
> @@ -266,6 +279,21 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
>  
>  static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
>  {
> +	struct pcie_port *pp = &imx6_pcie->pp;
> +	int ret;
> +
> +	if (imx6_pcie->is_imx6sx) {
> +		ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> +		if (ret) {
> +			dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> +			return ret;
> +		}
> +
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> +		return ret;
> +	}
> +
>  	/* power up core phy and enable ref clock */
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
>  			IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> @@ -319,6 +347,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
>  		msleep(100);
>  		gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
>  	}
> +
> +	if (imx6_pcie->is_imx6sx)
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
> +
>  	return 0;
>  
>  err_ref_clk:
> @@ -336,6 +369,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
>  {
>  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> +				   IMX6SX_GPR12_PCIE_RX_EQ_2);
> +	}
> +
>  	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  			IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
>  
> @@ -554,6 +593,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  	pp = &imx6_pcie->pp;
>  	pp->dev = &pdev->dev;
>  
> +	imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
> +						       "fsl,imx6sx-pcie");
> +
>  	/* Added for PCI abort handling */
>  	hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
>  		"imprecise external abort");
> @@ -589,6 +631,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
>  		return PTR_ERR(imx6_pcie->pcie);
>  	}
>  
> +	if (imx6_pcie->is_imx6sx) {
> +		imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
> +							   "pcie_inbound_axi");
> +		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
> +			dev_err(&pdev->dev,
> +				"pcie_incbound_axi clock missing or invalid\n");
> +			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
> +		}
> +	}
> +
>  	/* Grab GPR config register range */
>  	imx6_pcie->iomuxc_gpr =
>  		 syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
> @@ -615,6 +667,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
>  
>  static const struct of_device_id imx6_pcie_of_match[] = {
>  	{ .compatible = "fsl,imx6q-pcie", },
> +	{ .compatible = "fsl,imx6sx-pcie", },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
> -- 
> 2.1.4
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo at vger.kernel.org
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