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Date: Wed, 23 Sep 2015 18:24:33 +0530
From: Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>
To: <balbi@...com>, <peter.chen@...escale.com>,
<devicetree@...r.kernel.org>, <kishon@...com>
CC: <gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <punnaia@...inx.com>,
"Subbaraya Sundeep Bhatta" <sbhatta@...inx.com>
Subject: [RFC PATCH 2/2] usb: phy: Add platform driver support for ULPI PHYs
Based on board design USB controller needs explicit software
access to ULPI PHY for controlling VBUS. This patch adds platform
driver support for generic ULPI PHYs and provides a USB2 PHY device
to controllers.
Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
---
drivers/usb/phy/Kconfig | 12 +++
drivers/usb/phy/Makefile | 1 +
drivers/usb/phy/phy-platform-ulpi.c | 143 +++++++++++++++++++++++++++++++++++
3 files changed, 156 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/phy/phy-platform-ulpi.c
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 7d3beee..2956ad4 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -201,6 +201,18 @@ config USB_RCAR_PHY
To compile this driver as a module, choose M here: the
module will be called phy-rcar-usb.
+config USB_PLATFORM_ULPI_PHY
+ tristate "Platform driver support for ULPI PHYs"
+ depends on ARCH_ZYNQ || COMPILE_TEST
+ select USB_PHY
+ select USB_ULPI_VIEWPORT
+ help
+ Say Y here to add support for the Platform driver for ULPI PHYs.
+ This adds platform driver support for all generic ULPI PHYs and is
+ typically used if usb controller driver needs explicit access to PHY.
+
+ To compile this driver as a module, choose M here.
+
config USB_ULPI
bool "Generic ULPI Transceiver Driver"
depends on ARM || ARM64
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index 19c0dcc..8431b6b 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_USB_QCOM_8X16_PHY) += phy-qcom-8x16-usb.o
obj-$(CONFIG_USB_MV_OTG) += phy-mv-usb.o
obj-$(CONFIG_USB_MXS_PHY) += phy-mxs-usb.o
obj-$(CONFIG_USB_RCAR_PHY) += phy-rcar-usb.o
+obj-$(CONFIG_USB_PLATFORM_ULPI_PHY) += phy-platform-ulpi.o
obj-$(CONFIG_USB_ULPI) += phy-ulpi.o
obj-$(CONFIG_USB_ULPI_VIEWPORT) += phy-ulpi-viewport.o
obj-$(CONFIG_KEYSTONE_USB_PHY) += phy-keystone.o
diff --git a/drivers/usb/phy/phy-platform-ulpi.c b/drivers/usb/phy/phy-platform-ulpi.c
new file mode 100644
index 0000000..fb89363
--- /dev/null
+++ b/drivers/usb/phy/phy-platform-ulpi.c
@@ -0,0 +1,143 @@
+/*
+ * Platform driver for generic ULPI PHYs.
+ *
+ * Copyright (C) 2015 Xilinx, Inc.
+ *
+ * Author: Subbaraya Sundeep <sbhatta@...inx.com>
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation;
+ * either version 2 of the License, or (at your option) any
+ * later version.
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/usb/ulpi.h>
+#include <linux/usb/phy.h>
+
+/**
+ * struct ulpi_phy - The ULPI PHY
+ * @usb_phy: pointer to usb phy
+ * @regs: base address of USB controller to which PHY is connected
+ * @vp_offset: ulpi viewport register offset of USB controller
+ * @flags: initial required settings of PHY
+ */
+
+struct ulpi_phy {
+ struct usb_phy *usb_phy;
+ void __iomem *regs;
+ unsigned int vp_offset;
+ unsigned int flags;
+};
+
+/**
+ * usbphy_set_vbus - Sets VBUS by writing to PHY.
+ * @phy: pointer to PHY
+ * @on: 1 - turn on VBUS
+ * 0 - turn off VBUS
+ * Return: 0 for success and error value on failure
+ */
+static int usbphy_set_vbus(struct usb_phy *phy, int on)
+{
+ unsigned int flags = usb_phy_io_read(phy, ULPI_OTG_CTRL);
+
+ flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT);
+
+ if (on) {
+ if (phy->flags & ULPI_OTG_DRVVBUS)
+ flags |= ULPI_OTG_CTRL_DRVVBUS;
+
+ if (phy->flags & ULPI_OTG_DRVVBUS_EXT)
+ flags |= ULPI_OTG_CTRL_DRVVBUS_EXT;
+ }
+
+ return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL);
+}
+
+/**
+ * ulpi_phy_probe - The device probe function for driver initialization.
+ * @pdev: pointer to the platform device structure.
+ *
+ * Return: 0 for success and error value on failure
+ */
+static int ulpi_phy_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct resource *res;
+ struct ulpi_phy *uphy;
+ bool flag;
+ int ret;
+
+ uphy = devm_kzalloc(&pdev->dev, sizeof(*uphy), GFP_KERNEL);
+ if (!uphy)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ uphy->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (IS_ERR(uphy->regs))
+ return PTR_ERR(uphy->regs);
+
+ ret = of_property_read_u32(np, "view-port", &uphy->vp_offset);
+ if (IS_ERR(uphy->regs)) {
+ dev_err(&pdev->dev, "view-port register not specified\n");
+ return PTR_ERR(uphy->regs);
+ }
+
+ flag = of_property_read_bool(np, "drv-vbus");
+ if (flag)
+ uphy->flags |= ULPI_OTG_DRVVBUS | ULPI_OTG_DRVVBUS_EXT;
+
+ uphy->usb_phy = otg_ulpi_create(&ulpi_viewport_access_ops, uphy->flags);
+
+ uphy->usb_phy->set_vbus = usbphy_set_vbus;
+
+ uphy->usb_phy->dev = &pdev->dev;
+
+ uphy->usb_phy->io_priv = uphy->regs + uphy->vp_offset;
+
+ ret = usb_add_phy_dev(uphy->usb_phy);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+/**
+ * ulpi_phy_remove - Releases the resources allocated during the initialization.
+ * @pdev: pointer to the platform device structure.
+ *
+ * Return: 0 always
+ */
+static int ulpi_phy_remove(struct platform_device *pdev)
+{
+ struct ulpi_phy *uphy = platform_get_drvdata(pdev);
+
+ usb_remove_phy(uphy->usb_phy);
+
+ return 0;
+}
+
+/* Match table for of_platform binding */
+static const struct of_device_id ulpi_phy_table[] = {
+ { .compatible = "ulpi-phy" },
+ { /* end of list */},
+};
+MODULE_DEVICE_TABLE(of, ulpi_phy_table);
+
+static struct platform_driver ulpi_phy_driver = {
+ .probe = ulpi_phy_probe,
+ .remove = ulpi_phy_remove,
+ .driver = {
+ .name = "ulpi-platform-phy",
+ .of_match_table = of_match_ptr(ulpi_phy_table),
+ },
+};
+module_platform_driver(ulpi_phy_driver);
+
+MODULE_DESCRIPTION("ULPI PHY platform driver");
+MODULE_AUTHOR("Xilinx, Inc");
+MODULE_LICENSE("GPL v2");
--
1.7.1
--
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