[PATCH v2 02/18] phy: pipe3: insert delay to enumerate in GEN2 mode

From: Kishon Vijay Abraham I <kishon@ti.com>
To: <devicetree@vger.kernel.org>, <linux-doc@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-omap@vger.kernel.org>, <linux-pci@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>
Cc: <arnd@arndb.de>, <tony@atomide.com>, <jg1.han@samsung.com>,
	<kishon@ti.com>
Subject: [PATCH v2 02/18] phy: pipe3: insert delay to enumerate in GEN2 mode
Date: Thu, 29 May 2014 12:08:04 +0530	[thread overview]
Message-ID: <1401345500-20188-3-git-send-email-kishon@ti.com> (raw)
In-Reply-To: <1401345500-20188-1-git-send-email-kishon@ti.com>

8-bit delay value (0xF1) is required for GEN2 devices to be enumerated
consistently. Added an API to be called from PHY drivers to set this delay
value and called it from PIPE3 driver to set the delay value.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
---
 Documentation/devicetree/bindings/phy/ti-phy.txt |   12 ++---
 drivers/phy/phy-omap-control.c                   |   52 +++++++++++++++++++++-
 drivers/phy/phy-ti-pipe3.c                       |    4 +-
 include/linux/phy/omap_control_phy.h             |   10 +++++
 4 files changed, 71 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt b/Documentation/devicetree/bindings/phy/ti-phy.txt
index cf3de7e..36bb6c9 100644
--- a/Documentation/devicetree/bindings/phy/ti-phy.txt
+++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
@@ -9,15 +9,17 @@ Required properties:
                         e.g. USB2_PHY on OMAP5.
  "ti,control-phy-pipe3" - if it has DPLL and individual Rx & Tx power control
                         e.g. USB3 PHY and SATA PHY on OMAP5.
+ "ti,control-phy-pcie" - for pcie to support external clock for pcie and to
+			set PCS delay value.
+			e.g. PCIE PHY in DRA7x
  "ti,control-phy-usb2-dra7" - if it has power down register like USB2 PHY on
                         DRA7 platform.
  "ti,control-phy-usb2-am437" - if it has power down register like USB2 PHY on
                         AM437 platform.
- - reg : Address and length of the register set for the device. It contains
-   the address of "otghs_control" for control-phy-otghs or "power" register
-   for other types.
- - reg-names: should be "otghs_control" control-phy-otghs and "power" for
-   other types.
+ - reg : register ranges as listed in the reg-names property
+ - reg-names: "otghs_control" for control-phy-otghs
+	      "power", "pcie_pcs" and "control_sma" for control-phy-pcie
+	      "power" for all other types
 
 omap_control_usb: omap-control-usb@4a002300 {
         compatible = "ti,control-phy-otghs";
diff --git a/drivers/phy/phy-omap-control.c b/drivers/phy/phy-omap-control.c
index 311b4f9..9487bf1 100644
--- a/drivers/phy/phy-omap-control.c
+++ b/drivers/phy/phy-omap-control.c
@@ -27,6 +27,41 @@
 #include <linux/phy/omap_control_phy.h>
 
 /**
+ * omap_control_pcie_pcs - set the PCS delay count
+ * @dev: the control module device
+ * @id: index of the pcie PHY (should be 1 or 2)
+ * @delay: 8 bit delay value
+ */
+void omap_control_pcie_pcs(struct device *dev, u8 id, u8 delay)
+{
+	u32 val;
+	struct omap_control_phy	*control_phy;
+
+	if (IS_ERR(dev) || !dev) {
+		pr_err("%s: invalid device\n", __func__);
+		return;
+	}
+
+	control_phy = dev_get_drvdata(dev);
+	if (!control_phy) {
+		dev_err(dev, "%s: invalid control phy device\n", __func__);
+		return;
+	}
+
+	if (control_phy->type != OMAP_CTRL_TYPE_PCIE) {
+		dev_err(dev, "%s: unsupported operation\n", __func__);
+		return;
+	}
+
+	val = readl(control_phy->pcie_pcs);
+	val &= ~(OMAP_CTRL_PCIE_PCS_MASK <<
+		(id * OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT));
+	val |= delay << (id * OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT);
+	writel(val, control_phy->pcie_pcs);
+}
+EXPORT_SYMBOL_GPL(omap_control_pcie_pcs);
+
+/**
  * omap_control_phy_power - power on/off the phy using control module reg
  * @dev: the control module device
  * @on: 0 or 1, based on powering on or off the PHY
@@ -61,6 +96,7 @@ void omap_control_phy_power(struct device *dev, int on)
 			val |= OMAP_CTRL_DEV_PHY_PD;
 		break;
 
+	case OMAP_CTRL_TYPE_PCIE:
 	case OMAP_CTRL_TYPE_PIPE3:
 		rate = clk_get_rate(control_phy->sys_clk);
 		rate = rate/1000000;
@@ -211,6 +247,7 @@ EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);
 static const enum omap_control_phy_type otghs_data = OMAP_CTRL_TYPE_OTGHS;
 static const enum omap_control_phy_type usb2_data = OMAP_CTRL_TYPE_USB2;
 static const enum omap_control_phy_type pipe3_data = OMAP_CTRL_TYPE_PIPE3;
+static const enum omap_control_phy_type pcie_data = OMAP_CTRL_TYPE_PCIE;
 static const enum omap_control_phy_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2;
 static const enum omap_control_phy_type am437usb2_data = OMAP_CTRL_TYPE_AM437USB2;
 
@@ -228,6 +265,10 @@ static const struct of_device_id omap_control_phy_id_table[] = {
 		.data = &pipe3_data,
 	},
 	{
+		.compatible = "ti,control-phy-pcie",
+		.data = &pcie_data,
+	},
+	{
 		.compatible = "ti,control-phy-usb2-dra7",
 		.data = &dra7usb2_data,
 	},
@@ -279,7 +320,8 @@ static int omap_control_phy_probe(struct platform_device *pdev)
 		}
 	}
 
-	if (control_phy->type == OMAP_CTRL_TYPE_PIPE3) {
+	if (control_phy->type == OMAP_CTRL_TYPE_PIPE3 ||
+	    control_phy->type == OMAP_CTRL_TYPE_PCIE) {
 		control_phy->sys_clk = devm_clk_get(control_phy->dev,
 			"sys_clkin");
 		if (IS_ERR(control_phy->sys_clk)) {
@@ -288,6 +330,14 @@ static int omap_control_phy_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (control_phy->type == OMAP_CTRL_TYPE_PCIE) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+						   "pcie_pcs");
+		control_phy->pcie_pcs = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(control_phy->pcie_pcs))
+			return PTR_ERR(control_phy->pcie_pcs);
+	}
+
 	dev_set_drvdata(control_phy->dev, control_phy);
 
 	return 0;
diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index d43019d..11a1594 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -216,8 +216,10 @@ static int ti_pipe3_init(struct phy *x)
 	u32 val;
 	int ret = 0;
 
-	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")) {
+		omap_control_pcie_pcs(phy->control_dev, 0x1, 0xF1);
 		return 0;
+	}
 
 	/* Bring it out of IDLE if it is IDLE */
 	val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
diff --git a/include/linux/phy/omap_control_phy.h b/include/linux/phy/omap_control_phy.h
index 5450403..e9e6cfb 100644
--- a/include/linux/phy/omap_control_phy.h
+++ b/include/linux/phy/omap_control_phy.h
@@ -23,6 +23,7 @@ enum omap_control_phy_type {
 	OMAP_CTRL_TYPE_OTGHS = 1,	/* Mailbox OTGHS_CONTROL */
 	OMAP_CTRL_TYPE_USB2,	/* USB2_PHY, power down in CONTROL_DEV_CONF */
 	OMAP_CTRL_TYPE_PIPE3,	/* PIPE3 PHY, DPLL & seperate Rx/Tx power */
+	OMAP_CTRL_TYPE_PCIE,	/* RX TX control of ACSPCIE */
 	OMAP_CTRL_TYPE_DRA7USB2, /* USB2 PHY, power and power_aux e.g. DRA7 */
 	OMAP_CTRL_TYPE_AM437USB2, /* USB2 PHY, power e.g. AM437x */
 };
@@ -33,6 +34,7 @@ struct omap_control_phy {
 	u32 __iomem *otghs_control;
 	u32 __iomem *power;
 	u32 __iomem *power_aux;
+	u32 __iomem *pcie_pcs;
 
 	struct clk *sys_clk;
 
@@ -63,6 +65,9 @@ enum omap_control_usb_mode {
 #define	OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON	0x3
 #define	OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF	0x0
 
+#define	OMAP_CTRL_PCIE_PCS_MASK			0xff
+#define	OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT	0x8
+
 #define OMAP_CTRL_USB2_PHY_PD		BIT(28)
 
 #define AM437X_CTRL_USB2_PHY_PD		BIT(0)
@@ -74,6 +79,7 @@ enum omap_control_usb_mode {
 void omap_control_phy_power(struct device *dev, int on);
 void omap_control_usb_set_mode(struct device *dev,
 			       enum omap_control_usb_mode mode);
+void omap_control_pcie_pcs(struct device *dev, u8 id, u8 delay);
 #else
 
 static inline void omap_control_phy_power(struct device *dev, int on)
@@ -84,6 +90,10 @@ static inline void omap_control_usb_set_mode(struct device *dev,
 	enum omap_control_usb_mode mode)
 {
 }
+
+static inline void omap_control_pcie_pcs(struct device *dev, u8 id, u8 delay)
+{
+}
 #endif
 
 #endif	/* __OMAP_CONTROL_PHY_H__ */
-- 
1.7.9.5

