[PATCH 4/9] usb: phy: add the Berlin USB PHY driver

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Add the driver driving the Marvell Berlin USB PHY. This allows to
initialize the PHY and to use it from the USB driver later.

Signed-off-by: Antoine Ténart <antoine.tenart@xxxxxxxxxxxxxxxxxx>
---
 drivers/usb/phy/Kconfig          |   9 ++
 drivers/usb/phy/Makefile         |   1 +
 drivers/usb/phy/phy-berlin-usb.c | 223 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 233 insertions(+)
 create mode 100644 drivers/usb/phy/phy-berlin-usb.c

diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 416e0c8cf6ff..8be8d4afc428 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -27,6 +27,15 @@ config AB8500_USB
 	  This transceiver supports high and full speed devices plus,
 	  in host mode, low speed.
 
+config BERLIN_USBPHY
+	tristate "Marvell Berlin USB Transceiver Driver"
+	depends on ARCH_BERLIN
+	select USB_PHY
+	help
+	  Enable this to support the USB tranceiver on Marvell Berlin
+	  SoCs.
+
+
 config FSL_USB2_OTG
 	bool "Freescale USB OTG Transceiver Driver"
 	depends on USB_EHCI_FSL && USB_FSL_USB2 && USB_OTG_FSM && PM_RUNTIME
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index f8fa719a31b9..9253f59cf82a 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_USB_OTG_FSM)		+= phy-fsm-usb.o
 # transceiver drivers, keep the list sorted
 
 obj-$(CONFIG_AB8500_USB)		+= phy-ab8500-usb.o
+obj-$(CONFIG_BERLIN_USBPHY)		+= phy-berlin-usb.o
 obj-$(CONFIG_FSL_USB2_OTG)		+= phy-fsl-usb.o
 obj-$(CONFIG_ISP1301_OMAP)		+= phy-isp1301-omap.o
 obj-$(CONFIG_MV_U3D_PHY)		+= phy-mv-u3d-usb.o
diff --git a/drivers/usb/phy/phy-berlin-usb.c b/drivers/usb/phy/phy-berlin-usb.c
new file mode 100644
index 000000000000..79416668a71b
--- /dev/null
+++ b/drivers/usb/phy/phy-berlin-usb.c
@@ -0,0 +1,223 @@
+/*
+ * Copyright (C) 2014 Marvell Technology Group Ltd.
+ *
+ * Antoine Ténart <antoine.tenart@xxxxxxxxxxxxxxxxxx>
+ * Jisheng Zhang <jszhang@xxxxxxxxxxx>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/usb/phy.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#define USB_PHY_PLL		0x04
+#define USB_PHY_PLL_CONTROL	0x08
+#define USB_PHY_TX_CTRL0	0x10
+#define USB_PHY_TX_CTRL1	0x14
+#define USB_PHY_TX_CTRL2	0x18
+#define USB_PHY_RX_CTRL		0x20
+#define USB_PHY_ANALOG		0x34
+
+/* USB_PHY_PLL */
+#define CLK_REF_DIV(x)		((x) << 4)
+#define FEEDBACK_CLK_DIV(x)	((x) << 8)
+
+/* USB_PHY_PLL_CONTROL */
+#define CLK_STABLE		(0x1 << 0)
+#define PLL_CTRL_PIN		(0x1 << 1)
+#define PLL_CTRL_REG		(0x1 << 2)
+#define PLL_ON			(0x1 << 3)
+#define PHASE_OFF_TOL_125	(0x0 << 5)
+#define PHASE_OFF_TOL_250	(0x1 << 5)
+#define KVC0_CALIB		(0x0 << 9)
+#define KVC0_REG_CTRL		(0x1 << 9)
+#define KVC0_HIGH		(0x0 << 10)
+#define KVC0_LOW		(0x3 << 10)
+#define CLK_BLK_EN		(0x1 << 13)
+
+/* USB_PHY_TX_CTRL0 */
+#define EXT_HS_RCAL_EN		(0x1 << 3)
+#define EXT_FS_RCAL_EN		(0x1 << 4)
+#define IMPCAL_VTH_DIV(x)	((x) << 5)
+#define EXT_RS_RCAL_DIV(x)	((x) << 8)
+#define EXT_FS_RCAL_DIV(x)	((x) << 12)
+
+/* USB_PHY_TX_CTRL1 */
+#define TX_VDD15_14		(0x0 << 4)
+#define TX_VDD15_15		(0x1 << 4)
+#define TX_VDD15_16		(0x2 << 4)
+#define TX_VDD15_17		(0x3 << 4)
+#define TX_VDD12_VDD		(0x0 << 6)
+#define TX_VDD12_11		(0x1 << 6)
+#define TX_VDD12_12		(0x2 << 6)
+#define TX_VDD12_13		(0x3 << 6)
+#define LOW_VDD_EN		(0x1 << 8)
+#define TX_OUT_AMP(x)		((x) << 9)
+
+/* USB_PHY_TX_CTRL2 */
+#define TX_CHAN_CTRL_REG(x)	((x) << 0)
+#define DRV_SLEWRATE(x)		((x) << 4)
+#define IMP_CAL_FS_HS_DLY_0	(0x0 << 6)
+#define IMP_CAL_FS_HS_DLY_1	(0x1 << 6)
+#define IMP_CAL_FS_HS_DLY_2	(0x2 << 6)
+#define IMP_CAL_FS_HS_DLY_3	(0x3 << 6)
+#define FS_DRV_EN_MASK(x)	((x) << 8)
+#define HS_DRV_EN_MASK(x)	((x) << 12)
+
+/* USB_PHY_RX_CTRL */
+#define PHASE_FREEZE_DLY_2_CL	(0x0 << 0)
+#define PHASE_FREEZE_DLY_4_CL	(0x1 << 0)
+#define ACK_LENGTH_8_CL		(0x0 << 2)
+#define ACK_LENGTH_12_CL	(0x1 << 2)
+#define ACK_LENGTH_16_CL	(0x2 << 2)
+#define ACK_LENGTH_20_CL	(0x3 << 2)
+#define SQ_LENGTH_3		(0x0 << 4)
+#define SQ_LENGTH_6		(0x1 << 4)
+#define SQ_LENGTH_9		(0x2 << 4)
+#define SQ_LENGTH_12		(0x3 << 4)
+#define DISCON_THRESHOLD_260	(0x0 << 6)
+#define DISCON_THRESHOLD_270	(0x1 << 6)
+#define DISCON_THRESHOLD_280	(0x2 << 6)
+#define DISCON_THRESHOLD_290	(0x3 << 6)
+#define SQ_THRESHOLD(x)		((x) << 8)
+#define LPF_COEF(x)		((x) << 12)
+#define INTPL_CUR_10		(0x0 << 14)
+#define INTPL_CUR_20		(0x1 << 14)
+#define INTPL_CUR_30		(0x2 << 14)
+#define INTPL_CUR_40		(0x3 << 14)
+
+/* USB_PHY_ANALOG */
+#define ANA_PWR_UP		(0x1 << 1)
+#define ANA_PWR_DOWN		(0x1 << 2)
+#define V2I_VCO_RATIO(x)	((x) << 7)
+#define R_ROTATE_90		(0x0 << 10)
+#define R_ROTATE_0		(0x1 << 10)
+#define MODE_TEST_EN		(0x1 << 11)
+#define ANA_TEST_DC_CTRL(x)	((x) << 12)
+
+#define to_berlin_phy_priv(p)	container_of((p), struct berlin_phy_priv, phy)
+
+struct berlin_phy_priv {
+	void __iomem		*base;
+	struct usb_phy		phy;
+	struct reset_control	*rst_ctrl;
+	int			pwr_gpio;
+};
+
+static int berlin_phy_init(struct usb_phy *phy)
+{
+	struct berlin_phy_priv *priv = to_berlin_phy_priv(phy);
+	int ret;
+
+	reset_control_reset(priv->rst_ctrl);
+
+	writel(CLK_REF_DIV(0xc) | FEEDBACK_CLK_DIV(0x54),
+	       priv->base + USB_PHY_PLL);
+	writel(CLK_STABLE | PLL_CTRL_REG | PHASE_OFF_TOL_250 | KVC0_REG_CTRL |
+	       CLK_BLK_EN, priv->base + USB_PHY_PLL_CONTROL);
+	writel(V2I_VCO_RATIO(0x5) | R_ROTATE_0 | ANA_TEST_DC_CTRL(0x5),
+	       priv->base + USB_PHY_ANALOG);
+	writel(PHASE_FREEZE_DLY_4_CL | ACK_LENGTH_16_CL | SQ_LENGTH_12 |
+	       DISCON_THRESHOLD_260 | SQ_THRESHOLD(0xa) | LPF_COEF(0x2) |
+	       INTPL_CUR_30, priv->base + USB_PHY_RX_CTRL);
+
+	writel(TX_VDD12_13 | TX_OUT_AMP(0x3), priv->base + USB_PHY_TX_CTRL1);
+	writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4),
+	       priv->base + USB_PHY_TX_CTRL0);
+
+	writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4) |
+	       EXT_FS_RCAL_DIV(0x2), priv->base + USB_PHY_TX_CTRL0);
+
+	writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4),
+	       priv->base + USB_PHY_TX_CTRL0);
+	writel(TX_CHAN_CTRL_REG(0xf) | DRV_SLEWRATE(0x3) | IMP_CAL_FS_HS_DLY_3 |
+	       FS_DRV_EN_MASK(0xd), priv->base + USB_PHY_TX_CTRL2);
+
+	ret = gpio_direction_output(priv->pwr_gpio, 0);
+	if (ret)
+		return ret;
+
+	gpio_set_value(priv->pwr_gpio, 1);
+
+	return 0;
+}
+
+static void berlin_phy_shutdown(struct usb_phy *phy)
+{
+	struct berlin_phy_priv *priv = to_berlin_phy_priv(phy);
+
+	gpio_set_value(priv->pwr_gpio, 0);
+}
+
+static int berlin_phy_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct berlin_phy_priv *priv;
+	struct resource *res;
+	int ret, gpio;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	priv->rst_ctrl = devm_reset_control_get(&pdev->dev, NULL);
+	if (IS_ERR(priv->rst_ctrl)) {
+		ret = PTR_ERR(priv->rst_ctrl);
+		dev_err(&pdev->dev, "cannot get reset controller: %d\n", ret);
+		return ret;
+	}
+
+	gpio = of_get_named_gpio(np, "power-gpio", 0);
+	if (!gpio_is_valid(gpio))
+		return gpio;
+
+	ret = gpio_request(gpio, "power-gpio");
+	if (ret) {
+		dev_err(&pdev->dev, "cannot request GPIO %d", gpio);
+		return ret;
+	}
+	priv->pwr_gpio = gpio;
+
+	priv->phy.io_priv = priv->base;
+	priv->phy.dev = &pdev->dev;
+	priv->phy.label = "phy-berlin-usb";
+	priv->phy.init = berlin_phy_init;
+	priv->phy.shutdown = berlin_phy_shutdown;
+	priv->phy.type = USB_PHY_TYPE_USB2;
+
+	platform_set_drvdata(pdev, priv);
+
+	return usb_add_phy_dev(&priv->phy);
+}
+
+static const struct of_device_id phy_berlin_sata_of_match[] = {
+	{ .compatible = "marvell,berlin-usbphy" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, phy_berlin_sata_of_match);
+
+static struct platform_driver phy_berlin_usb_driver = {
+	.probe	= berlin_phy_probe,
+	.driver	= {
+		.name		= "phy-berlin-usb",
+		.owner		= THIS_MODULE,
+		.of_match_table	= phy_berlin_sata_of_match,
+	 },
+};
+module_platform_driver(phy_berlin_usb_driver);
+
+MODULE_AUTHOR("Antoine Ténart <antoine.tenart@xxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Marvell Berlin USB PHY driver");
+MODULE_LICENSE("GPL");
-- 
1.9.1

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