linux-kernel - [PATCH 2/2] phy: ti-pipe3: configure usb3 phy to be used as pcie phy

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Date:	Wed, 6 Jan 2016 16:29:08 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<kishon@...com>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	<linux-omap@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<rogerq@...com>, <nsekhar@...com>
Subject: [PATCH 2/2] phy: ti-pipe3: configure usb3 phy to be used as pcie phy

DRA72 uses USB3 PHY for the 2nd lane of PCIE. The configuration
required to make USB3 PHY used for the 2nd lane of PCIe is done
here.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 Documentation/devicetree/bindings/phy/ti-phy.txt |    2 ++
 drivers/phy/phy-ti-pipe3.c                       |   30 +++++++++++++++++++++-
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt b/Documentation/devicetree/bindings/phy/ti-phy.txt
index a3b3945..6a7de94 100644
--- a/Documentation/devicetree/bindings/phy/ti-phy.txt
+++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
@@ -91,6 +91,8 @@ Optional properties:
    register that contains the SATA_PLL_SOFT_RESET bit. Only valid for sata_phy.
  - syscon-pcs : phandle/offset pair. Phandle to the system control module and the
    register offset to write the PCS delay value.
+ - "ti,configure-as-pcie" : property to indicate if the PHY should be
+   configured as PCIE PHY.
 
 Deprecated properties:
  - ctrl-module : phandle of the control module used by PHY driver to power on
diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index 7d83d2b..793185e 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -56,6 +56,12 @@
 
 #define SATA_PLL_SOFT_RESET	BIT(18)
 
+#define PHY_RX_ANA_PRGRAMMABILITY_REG	0xC
+#define MEM_EN_PLLBYP			BIT(7)
+
+#define PHY_TX_TEST_CONFIG	0x2C
+#define MEM_ENTESTCLK		BIT(31)
+
 #define PIPE3_PHY_PWRCTL_CLK_CMD_MASK	0x003FC000
 #define PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT	14
 
@@ -68,6 +74,10 @@
 #define PCIE_PCS_MASK			0xFF0000
 #define PCIE_PCS_DELAY_COUNT_SHIFT	0x10
 
+#define PIPE3_PHY_DISABLE_SYNC_POWER	BIT(4)
+
+#define CONFIGURE_AS_PCIE		BIT(0)
+
 /*
  * This is an Empirical value that works, need to confirm the actual
  * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
@@ -90,6 +100,7 @@ struct pipe3_dpll_map {
 };
 
 struct ti_pipe3 {
+	u32			flags;
 	void __iomem		*pll_ctrl_base;
 	void __iomem		*phy_rx;
 	void __iomem		*phy_tx;
@@ -270,6 +281,19 @@ static int ti_pipe3_init(struct phy *x)
 	int ret = 0;
 
 	ti_pipe3_enable_clocks(phy);
+
+	if (phy->flags & CONFIGURE_AS_PCIE) {
+		val = ti_pipe3_readl(phy->phy_rx,
+				     PHY_RX_ANA_PRGRAMMABILITY_REG);
+		val |= MEM_EN_PLLBYP;
+		ti_pipe3_writel(phy->phy_rx, PHY_RX_ANA_PRGRAMMABILITY_REG,
+				val);
+		val = ti_pipe3_readl(phy->phy_tx, PHY_TX_TEST_CONFIG);
+		val |= MEM_ENTESTCLK;
+		ti_pipe3_writel(phy->phy_tx, PHY_TX_TEST_CONFIG, val);
+		return 0;
+	}
+
 	/*
 	 * Set pcie_pcs register to 0x96 for proper functioning of phy
 	 * as recommended in AM572x TRM SPRUHZ6, section 18.5.2.2, table
@@ -318,7 +342,8 @@ static int ti_pipe3_exit(struct phy *x)
 		return 0;
 
 	/* PCIe doesn't have internal DPLL */
-	if (!of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie")) {
+	if (!of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie") &&
+			!(phy->flags & CONFIGURE_AS_PCIE)) {
 		/* Put DPLL in IDLE mode */
 		val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
 		val |= PLL_IDLE;
@@ -590,6 +615,9 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	if (of_property_read_bool(node, "ti,configure-as-pcie"))
+		phy->flags |= CONFIGURE_AS_PCIE;
+
 	platform_set_drvdata(pdev, phy);
 	pm_runtime_enable(dev);
 
-- 
1.7.9.5

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