PCI: exynos: Remove deprecated PHY initialization code

Exynos platforms have a PCI PHY driver in the PHY framework that can be
used by the PCI host bridge drivers to initialize and manage the PHY.

Remove the deprecated PHY initialization code in the Exynos PCI host
bridge driver by updating the driver to use the PHY framework API;
modify the DT binding documentation accordingly.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt

@@ -6,9 +6,6 @@ and thus inherits all the common properties defined in designware-pcie.txt.
 Required properties:
 - compatible: "samsung,exynos5440-pcie"
 - reg: base addresses and lengths of the PCIe controller,
-	the PHY controller, additional register for the PHY controller.
-	(Registers for the PHY controller are DEPRECATED.
-	 Use the PHY framework.)
 - reg-names : First name should be set to "elbi".
 	And use the "config" instead of getting the configuration address space
 	from "ranges".
@@ -23,49 +20,8 @@ For other common properties, refer to
 
 Example:
 
-SoC-specific DT Entry:
+SoC-specific DT Entry (with using PHY framework):
 
-	pcie@290000 {
-		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
-		reg = <0x290000 0x1000
-			0x270000 0x1000
-			0x271000 0x40>;
-		interrupts = <0 20 0>, <0 21 0>, <0 22 0>;
-		clocks = <&clock 28>, <&clock 27>;
-		clock-names = "pcie", "pcie_bus";
-		#address-cells = <3>;
-		#size-cells = <2>;
-		device_type = "pci";
-		ranges = <0x00000800 0 0x40000000 0x40000000 0 0x00001000   /* configuration space */
-			  0x81000000 0 0	  0x40001000 0 0x00010000   /* downstream I/O */
-			  0x82000000 0 0x40011000 0x40011000 0 0x1ffef000>; /* non-prefetchable memory */
-		#interrupt-cells = <1>;
-		interrupt-map-mask = <0 0 0 0>;
-		interrupt-map = <0 0 0 0 &gic GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
-		num-lanes = <4>;
-	};
-
-	pcie@2a0000 {
-		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
-		reg = <0x2a0000 0x1000
-			0x272000 0x1000
-			0x271040 0x40>;
-		interrupts = <0 23 0>, <0 24 0>, <0 25 0>;
-		clocks = <&clock 29>, <&clock 27>;
-		clock-names = "pcie", "pcie_bus";
-		#address-cells = <3>;
-		#size-cells = <2>;
-		device_type = "pci";
-		ranges = <0x00000800 0 0x60000000 0x60000000 0 0x00001000   /* configuration space */
-			  0x81000000 0 0	  0x60001000 0 0x00010000   /* downstream I/O */
-			  0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>; /* non-prefetchable memory */
-		#interrupt-cells = <1>;
-		interrupt-map-mask = <0 0 0 0>;
-		interrupt-map = <0 0 0 0 &gic GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
-		num-lanes = <4>;
-	};
-
-With using PHY framework:
 	pcie_phy0: pcie-phy@270000 {
 		...
 		reg = <0x270000 0x1000>, <0x271000 0x40>;
@@ -74,13 +30,21 @@ With using PHY framework:
 	};
 
 	pcie@290000 {
-		...
+		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
 		reg = <0x290000 0x1000>, <0x40000000 0x1000>;
 		reg-names = "elbi", "config";
+		clocks = <&clock 28>, <&clock 27>;
+		clock-names = "pcie", "pcie_bus";
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
 		phys = <&pcie_phy0>;
 		ranges = <0x81000000 0 0	  0x60001000 0 0x00010000
 			  0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>;
-		...
+		#interrupt-cells = <1>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
+		num-lanes = <4>;
 	};
 
 Board-specific DT Entry:

drivers/pci/dwc/pci-exynos.c

@@ -55,49 +55,8 @@
 #define PCIE_ELBI_SLV_ARMISC		0x120
 #define PCIE_ELBI_SLV_DBI_ENABLE	BIT(21)
 
-/* PCIe Purple registers */
-#define PCIE_PHY_GLOBAL_RESET		0x000
-#define PCIE_PHY_COMMON_RESET		0x004
-#define PCIE_PHY_CMN_REG		0x008
-#define PCIE_PHY_MAC_RESET		0x00c
-#define PCIE_PHY_PLL_LOCKED		0x010
-#define PCIE_PHY_TRSVREG_RESET		0x020
-#define PCIE_PHY_TRSV_RESET		0x024
-
-/* PCIe PHY registers */
-#define PCIE_PHY_IMPEDANCE		0x004
-#define PCIE_PHY_PLL_DIV_0		0x008
-#define PCIE_PHY_PLL_BIAS		0x00c
-#define PCIE_PHY_DCC_FEEDBACK		0x014
-#define PCIE_PHY_PLL_DIV_1		0x05c
-#define PCIE_PHY_COMMON_POWER		0x064
-#define PCIE_PHY_COMMON_PD_CMN		BIT(3)
-#define PCIE_PHY_TRSV0_EMP_LVL		0x084
-#define PCIE_PHY_TRSV0_DRV_LVL		0x088
-#define PCIE_PHY_TRSV0_RXCDR		0x0ac
-#define PCIE_PHY_TRSV0_POWER		0x0c4
-#define PCIE_PHY_TRSV0_PD_TSV		BIT(7)
-#define PCIE_PHY_TRSV0_LVCC		0x0dc
-#define PCIE_PHY_TRSV1_EMP_LVL		0x144
-#define PCIE_PHY_TRSV1_RXCDR		0x16c
-#define PCIE_PHY_TRSV1_POWER		0x184
-#define PCIE_PHY_TRSV1_PD_TSV		BIT(7)
-#define PCIE_PHY_TRSV1_LVCC		0x19c
-#define PCIE_PHY_TRSV2_EMP_LVL		0x204
-#define PCIE_PHY_TRSV2_RXCDR		0x22c
-#define PCIE_PHY_TRSV2_POWER		0x244
-#define PCIE_PHY_TRSV2_PD_TSV		BIT(7)
-#define PCIE_PHY_TRSV2_LVCC		0x25c
-#define PCIE_PHY_TRSV3_EMP_LVL		0x2c4
-#define PCIE_PHY_TRSV3_RXCDR		0x2ec
-#define PCIE_PHY_TRSV3_POWER		0x304
-#define PCIE_PHY_TRSV3_PD_TSV		BIT(7)
-#define PCIE_PHY_TRSV3_LVCC		0x31c
-
 struct exynos_pcie_mem_res {
 	void __iomem *elbi_base;   /* DT 0th resource: PCIe CTRL */
-	void __iomem *phy_base;    /* DT 1st resource: PHY CTRL */
-	void __iomem *block_base;  /* DT 2nd resource: PHY ADDITIONAL CTRL */
 };
 
 struct exynos_pcie_clk_res {
@@ -112,8 +71,6 @@ struct exynos_pcie {
 	const struct exynos_pcie_ops	*ops;
 	int				reset_gpio;
 
-	/* For Generic PHY Framework */
-	bool				using_phy;
 	struct phy			*phy;
 };
 
@@ -141,20 +98,6 @@ static int exynos5440_pcie_get_mem_resources(struct platform_device *pdev,
 	if (IS_ERR(ep->mem_res->elbi_base))
 		return PTR_ERR(ep->mem_res->elbi_base);
 
-	/* If using the PHY framework, doesn't need to get other resource */
-	if (ep->using_phy)
-		return 0;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	ep->mem_res->phy_base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(ep->mem_res->phy_base))
-		return PTR_ERR(ep->mem_res->phy_base);
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
-	ep->mem_res->block_base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(ep->mem_res->block_base))
-		return PTR_ERR(ep->mem_res->block_base);
-
 	return 0;
 }
 
@@ -279,111 +222,6 @@ static void exynos_pcie_deassert_core_reset(struct exynos_pcie *ep)
 	exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_NONSTICKY_RESET);
 	exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_APP_INIT_RESET);
 	exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_APP_INIT_RESET);
-	exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_MAC_RESET);
-}
-
-static void exynos_pcie_assert_phy_reset(struct exynos_pcie *ep)
-{
-	exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_MAC_RESET);
-	exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_GLOBAL_RESET);
-}
-
-static void exynos_pcie_deassert_phy_reset(struct exynos_pcie *ep)
-{
-	exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_GLOBAL_RESET);
-	exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_PWR_RESET);
-	exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_COMMON_RESET);
-	exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_CMN_REG);
-	exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_TRSVREG_RESET);
-	exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_TRSV_RESET);
-}
-
-static void exynos_pcie_power_on_phy(struct exynos_pcie *ep)
-{
-	u32 val;
-
-	val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_COMMON_POWER);
-	val &= ~PCIE_PHY_COMMON_PD_CMN;
-	exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_COMMON_POWER);
-
-	val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV0_POWER);
-	val &= ~PCIE_PHY_TRSV0_PD_TSV;
-	exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV0_POWER);
-
-	val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV1_POWER);
-	val &= ~PCIE_PHY_TRSV1_PD_TSV;
-	exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV1_POWER);
-
-	val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV2_POWER);
-	val &= ~PCIE_PHY_TRSV2_PD_TSV;
-	exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV2_POWER);
-
-	val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV3_POWER);
-	val &= ~PCIE_PHY_TRSV3_PD_TSV;
-	exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV3_POWER);
-}
-
-static void exynos_pcie_power_off_phy(struct exynos_pcie *ep)
-{
-	u32 val;
-
-	val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_COMMON_POWER);
-	val |= PCIE_PHY_COMMON_PD_CMN;
-	exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_COMMON_POWER);
-
-	val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV0_POWER);
-	val |= PCIE_PHY_TRSV0_PD_TSV;
-	exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV0_POWER);
-
-	val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV1_POWER);
-	val |= PCIE_PHY_TRSV1_PD_TSV;
-	exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV1_POWER);
-
-	val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV2_POWER);
-	val |= PCIE_PHY_TRSV2_PD_TSV;
-	exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV2_POWER);
-
-	val = exynos_pcie_readl(ep->mem_res->phy_base, PCIE_PHY_TRSV3_POWER);
-	val |= PCIE_PHY_TRSV3_PD_TSV;
-	exynos_pcie_writel(ep->mem_res->phy_base, val, PCIE_PHY_TRSV3_POWER);
-}
-
-static void exynos_pcie_init_phy(struct exynos_pcie *ep)
-{
-	/* DCC feedback control off */
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x29, PCIE_PHY_DCC_FEEDBACK);
-
-	/* set TX/RX impedance */
-	exynos_pcie_writel(ep->mem_res->phy_base, 0xd5, PCIE_PHY_IMPEDANCE);
-
-	/* set 50Mhz PHY clock */
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x14, PCIE_PHY_PLL_DIV_0);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x12, PCIE_PHY_PLL_DIV_1);
-
-	/* set TX Differential output for lane 0 */
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x7f, PCIE_PHY_TRSV0_DRV_LVL);
-
-	/* set TX Pre-emphasis Level Control for lane 0 to minimum */
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x0, PCIE_PHY_TRSV0_EMP_LVL);
-
-	/* set RX clock and data recovery bandwidth */
-	exynos_pcie_writel(ep->mem_res->phy_base, 0xe7, PCIE_PHY_PLL_BIAS);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV0_RXCDR);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV1_RXCDR);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV2_RXCDR);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x82, PCIE_PHY_TRSV3_RXCDR);
-
-	/* change TX Pre-emphasis Level Control for lanes */
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV0_EMP_LVL);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV1_EMP_LVL);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV2_EMP_LVL);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x39, PCIE_PHY_TRSV3_EMP_LVL);
-
-	/* set LVCC */
-	exynos_pcie_writel(ep->mem_res->phy_base, 0x20, PCIE_PHY_TRSV0_LVCC);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0xa0, PCIE_PHY_TRSV1_LVCC);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0xa0, PCIE_PHY_TRSV2_LVCC);
-	exynos_pcie_writel(ep->mem_res->phy_base, 0xa0, PCIE_PHY_TRSV3_LVCC);
 }
 
 static void exynos_pcie_assert_reset(struct exynos_pcie *ep)
@@ -401,7 +239,6 @@ static int exynos_pcie_establish_link(struct exynos_pcie *ep)
 	struct dw_pcie *pci = ep->pci;
 	struct pcie_port *pp = &pci->pp;
 	struct device *dev = pci->dev;
-	u32 val;
 
 	if (dw_pcie_link_up(pci)) {
 		dev_err(dev, "Link already up\n");
@@ -410,32 +247,13 @@ static int exynos_pcie_establish_link(struct exynos_pcie *ep)
 
 	exynos_pcie_assert_core_reset(ep);
 
-	if (ep->using_phy) {
-		phy_reset(ep->phy);
-
-		exynos_pcie_writel(ep->mem_res->elbi_base, 1,
-				PCIE_PWR_RESET);
-
-		phy_power_on(ep->phy);
-		phy_init(ep->phy);
-	} else {
-		exynos_pcie_assert_phy_reset(ep);
-		exynos_pcie_deassert_phy_reset(ep);
-		exynos_pcie_power_on_phy(ep);
-		exynos_pcie_init_phy(ep);
-
-		/* pulse for common reset */
-		exynos_pcie_writel(ep->mem_res->block_base, 1,
-					PCIE_PHY_COMMON_RESET);
-		udelay(500);
-		exynos_pcie_writel(ep->mem_res->block_base, 0,
-					PCIE_PHY_COMMON_RESET);
-	}
+	phy_reset(ep->phy);
 
-	/* pulse for common reset */
-	exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_COMMON_RESET);
-	udelay(500);
-	exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_COMMON_RESET);
+	exynos_pcie_writel(ep->mem_res->elbi_base, 1,
+			PCIE_PWR_RESET);
+
+	phy_power_on(ep->phy);
+	phy_init(ep->phy);
 
 	exynos_pcie_deassert_core_reset(ep);
 	dw_pcie_setup_rc(pp);
@@ -449,18 +267,7 @@ static int exynos_pcie_establish_link(struct exynos_pcie *ep)
 	if (!dw_pcie_wait_for_link(pci))
 		return 0;
 
-	if (ep->using_phy) {
-		phy_power_off(ep->phy);
-		return -ETIMEDOUT;
-	}
-
-	while (exynos_pcie_readl(ep->mem_res->phy_base,
-				PCIE_PHY_PLL_LOCKED) == 0) {
-		val = exynos_pcie_readl(ep->mem_res->block_base,
-				PCIE_PHY_PLL_LOCKED);
-		dev_info(dev, "PLL Locked: 0x%x\n", val);
-	}
-	exynos_pcie_power_off_phy(ep);
+	phy_power_off(ep->phy);
 	return -ETIMEDOUT;
 }
 
@@ -678,16 +485,13 @@ static int __init exynos_pcie_probe(struct platform_device *pdev)
 
 	ep->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
 
-	/* Assume that controller doesn't use the PHY framework */
-	ep->using_phy = false;
-
 	ep->phy = devm_of_phy_get(dev, np, NULL);
 	if (IS_ERR(ep->phy)) {
 		if (PTR_ERR(ep->phy) == -EPROBE_DEFER)
 			return PTR_ERR(ep->phy);
-		dev_warn(dev, "Use the 'phy' property. Current DT of pci-exynos was deprecated!!\n");
-	} else
-		ep->using_phy = true;
+
+		ep->phy = NULL;
+	}
 
 	if (ep->ops && ep->ops->get_mem_resources) {
 		ret = ep->ops->get_mem_resources(pdev, ep);
@@ -713,8 +517,7 @@ static int __init exynos_pcie_probe(struct platform_device *pdev)
 	return 0;
 
 fail_probe:
-	if (ep->using_phy)
-		phy_exit(ep->phy);
+	phy_exit(ep->phy);
 
 	if (ep->ops && ep->ops->deinit_clk_resources)
 		ep->ops->deinit_clk_resources(ep);