Linux-libre 4.2-gnu

1 files changed, 153 insertions, 0 deletions

diff --git a/drivers/phy/phy-tusb1210.c b/drivers/phy/phy-tusb1210.c
new file mode 100644
index 000000000..07efdd318
--- /dev/null
+++ b/drivers/phy/phy-tusb1210.c
@@ -0,0 +1,153 @@
+/**
+ * tusb1210.c - TUSB1210 USB ULPI PHY driver
+ *
+ * Copyright (C) 2015 Intel Corporation
+ *
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/ulpi/driver.h>
+#include <linux/gpio/consumer.h>
+
+#include "ulpi_phy.h"
+
+#define TUSB1210_VENDOR_SPECIFIC2		0x80
+#define TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT	0
+#define TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT	4
+#define TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT	6
+
+struct tusb1210 {
+	struct ulpi *ulpi;
+	struct phy *phy;
+	struct gpio_desc *gpio_reset;
+	struct gpio_desc *gpio_cs;
+	u8 vendor_specific2;
+};
+
+static int tusb1210_power_on(struct phy *phy)
+{
+	struct tusb1210 *tusb = phy_get_drvdata(phy);
+
+	gpiod_set_value_cansleep(tusb->gpio_reset, 1);
+	gpiod_set_value_cansleep(tusb->gpio_cs, 1);
+
+	/* Restore the optional eye diagram optimization value */
+	if (tusb->vendor_specific2)
+		ulpi_write(tusb->ulpi, TUSB1210_VENDOR_SPECIFIC2,
+			   tusb->vendor_specific2);
+
+	return 0;
+}
+
+static int tusb1210_power_off(struct phy *phy)
+{
+	struct tusb1210 *tusb = phy_get_drvdata(phy);
+
+	gpiod_set_value_cansleep(tusb->gpio_reset, 0);
+	gpiod_set_value_cansleep(tusb->gpio_cs, 0);
+
+	return 0;
+}
+
+static struct phy_ops phy_ops = {
+	.power_on = tusb1210_power_on,
+	.power_off = tusb1210_power_off,
+	.owner = THIS_MODULE,
+};
+
+static int tusb1210_probe(struct ulpi *ulpi)
+{
+	struct gpio_desc *gpio;
+	struct tusb1210 *tusb;
+	u8 val, reg;
+	int ret;
+
+	tusb = devm_kzalloc(&ulpi->dev, sizeof(*tusb), GFP_KERNEL);
+	if (!tusb)
+		return -ENOMEM;
+
+	gpio = devm_gpiod_get(&ulpi->dev, "reset");
+	if (!IS_ERR(gpio)) {
+		ret = gpiod_direction_output(gpio, 0);
+		if (ret)
+			return ret;
+		gpiod_set_value_cansleep(gpio, 1);
+		tusb->gpio_reset = gpio;
+	}
+
+	gpio = devm_gpiod_get(&ulpi->dev, "cs");
+	if (!IS_ERR(gpio)) {
+		ret = gpiod_direction_output(gpio, 0);
+		if (ret)
+			return ret;
+		gpiod_set_value_cansleep(gpio, 1);
+		tusb->gpio_cs = gpio;
+	}
+
+	/*
+	 * VENDOR_SPECIFIC2 register in TUSB1210 can be used for configuring eye
+	 * diagram optimization and DP/DM swap.
+	 */
+
+	/* High speed output drive strength configuration */
+	device_property_read_u8(&ulpi->dev, "ihstx", &val);
+	reg = val << TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT;
+
+	/* High speed output impedance configuration */
+	device_property_read_u8(&ulpi->dev, "zhsdrv", &val);
+	reg |= val << TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT;
+
+	/* DP/DM swap control */
+	device_property_read_u8(&ulpi->dev, "datapolarity", &val);
+	reg |= val << TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT;
+
+	if (reg) {
+		ulpi_write(ulpi, TUSB1210_VENDOR_SPECIFIC2, reg);
+		tusb->vendor_specific2 = reg;
+	}
+
+	tusb->phy = ulpi_phy_create(ulpi, &phy_ops);
+	if (IS_ERR(tusb->phy))
+		return PTR_ERR(tusb->phy);
+
+	tusb->ulpi = ulpi;
+
+	phy_set_drvdata(tusb->phy, tusb);
+	ulpi_set_drvdata(ulpi, tusb);
+	return 0;
+}
+
+static void tusb1210_remove(struct ulpi *ulpi)
+{
+	struct tusb1210 *tusb = ulpi_get_drvdata(ulpi);
+
+	ulpi_phy_destroy(ulpi, tusb->phy);
+}
+
+#define TI_VENDOR_ID 0x0451
+
+static const struct ulpi_device_id tusb1210_ulpi_id[] = {
+	{ TI_VENDOR_ID, 0x1507, },
+	{ },
+};
+MODULE_DEVICE_TABLE(ulpi, tusb1210_ulpi_id);
+
+static struct ulpi_driver tusb1210_driver = {
+	.id_table = tusb1210_ulpi_id,
+	.probe = tusb1210_probe,
+	.remove = tusb1210_remove,
+	.driver = {
+		.name = "tusb1210",
+		.owner = THIS_MODULE,
+	},
+};
+
+module_ulpi_driver(tusb1210_driver);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("TUSB1210 ULPI PHY driver");