Initial import

1 files changed, 278 insertions, 0 deletions

diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
new file mode 100644
index 000000000..53d18150f
--- /dev/null
+++ b/drivers/net/phy/mdio-gpio.c
@@ -0,0 +1,278 @@
+/*
+ * GPIO based MDIO bitbang driver.
+ * Supports OpenFirmware.
+ *
+ * Copyright (c) 2008 CSE Semaphore Belgium.
+ *  by Laurent Pinchart <laurentp@cse-semaphore.com>
+ *
+ * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ *
+ * Based on earlier work by
+ *
+ * Copyright (c) 2003 Intracom S.A.
+ *  by Pantelis Antoniou <panto@intracom.gr>
+ *
+ * 2005 (c) MontaVista Software, Inc.
+ * Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * 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/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/mdio-gpio.h>
+
+#include <linux/of_gpio.h>
+#include <linux/of_mdio.h>
+
+struct mdio_gpio_info {
+	struct mdiobb_ctrl ctrl;
+	int mdc, mdio, mdo;
+	int mdc_active_low, mdio_active_low, mdo_active_low;
+};
+
+static void *mdio_gpio_of_get_data(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct mdio_gpio_platform_data *pdata;
+	enum of_gpio_flags flags;
+	int ret;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return NULL;
+
+	ret = of_get_gpio_flags(np, 0, &flags);
+	if (ret < 0)
+		return NULL;
+
+	pdata->mdc = ret;
+	pdata->mdc_active_low = flags & OF_GPIO_ACTIVE_LOW;
+
+	ret = of_get_gpio_flags(np, 1, &flags);
+	if (ret < 0)
+		return NULL;
+	pdata->mdio = ret;
+	pdata->mdio_active_low = flags & OF_GPIO_ACTIVE_LOW;
+
+	ret = of_get_gpio_flags(np, 2, &flags);
+	if (ret > 0) {
+		pdata->mdo = ret;
+		pdata->mdo_active_low = flags & OF_GPIO_ACTIVE_LOW;
+	}
+
+	return pdata;
+}
+
+static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
+{
+	struct mdio_gpio_info *bitbang =
+		container_of(ctrl, struct mdio_gpio_info, ctrl);
+
+	if (bitbang->mdo) {
+		/* Separate output pin. Always set its value to high
+		 * when changing direction. If direction is input,
+		 * assume the pin serves as pull-up. If direction is
+		 * output, the default value is high.
+		 */
+		gpio_set_value_cansleep(bitbang->mdo,
+					1 ^ bitbang->mdo_active_low);
+		return;
+	}
+
+	if (dir)
+		gpio_direction_output(bitbang->mdio,
+				      1 ^ bitbang->mdio_active_low);
+	else
+		gpio_direction_input(bitbang->mdio);
+}
+
+static int mdio_get(struct mdiobb_ctrl *ctrl)
+{
+	struct mdio_gpio_info *bitbang =
+		container_of(ctrl, struct mdio_gpio_info, ctrl);
+
+	return gpio_get_value_cansleep(bitbang->mdio) ^
+		bitbang->mdio_active_low;
+}
+
+static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
+{
+	struct mdio_gpio_info *bitbang =
+		container_of(ctrl, struct mdio_gpio_info, ctrl);
+
+	if (bitbang->mdo)
+		gpio_set_value_cansleep(bitbang->mdo,
+					what ^ bitbang->mdo_active_low);
+	else
+		gpio_set_value_cansleep(bitbang->mdio,
+					what ^ bitbang->mdio_active_low);
+}
+
+static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
+{
+	struct mdio_gpio_info *bitbang =
+		container_of(ctrl, struct mdio_gpio_info, ctrl);
+
+	gpio_set_value_cansleep(bitbang->mdc, what ^ bitbang->mdc_active_low);
+}
+
+static struct mdiobb_ops mdio_gpio_ops = {
+	.owner = THIS_MODULE,
+	.set_mdc = mdc_set,
+	.set_mdio_dir = mdio_dir,
+	.set_mdio_data = mdio_set,
+	.get_mdio_data = mdio_get,
+};
+
+static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
+					  struct mdio_gpio_platform_data *pdata,
+					  int bus_id)
+{
+	struct mii_bus *new_bus;
+	struct mdio_gpio_info *bitbang;
+	int i;
+
+	bitbang = devm_kzalloc(dev, sizeof(*bitbang), GFP_KERNEL);
+	if (!bitbang)
+		goto out;
+
+	bitbang->ctrl.ops = &mdio_gpio_ops;
+	bitbang->ctrl.reset = pdata->reset;
+	bitbang->mdc = pdata->mdc;
+	bitbang->mdc_active_low = pdata->mdc_active_low;
+	bitbang->mdio = pdata->mdio;
+	bitbang->mdio_active_low = pdata->mdio_active_low;
+	bitbang->mdo = pdata->mdo;
+	bitbang->mdo_active_low = pdata->mdo_active_low;
+
+	new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
+	if (!new_bus)
+		goto out;
+
+	new_bus->name = "GPIO Bitbanged MDIO",
+
+	new_bus->phy_mask = pdata->phy_mask;
+	new_bus->irq = pdata->irqs;
+	new_bus->parent = dev;
+
+	if (new_bus->phy_mask == ~0)
+		goto out_free_bus;
+
+	for (i = 0; i < PHY_MAX_ADDR; i++)
+		if (!new_bus->irq[i])
+			new_bus->irq[i] = PHY_POLL;
+
+	if (bus_id != -1)
+		snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
+	else
+		strncpy(new_bus->id, "gpio", MII_BUS_ID_SIZE);
+
+	if (devm_gpio_request(dev, bitbang->mdc, "mdc"))
+		goto out_free_bus;
+
+	if (devm_gpio_request(dev, bitbang->mdio, "mdio"))
+		goto out_free_bus;
+
+	if (bitbang->mdo) {
+		if (devm_gpio_request(dev, bitbang->mdo, "mdo"))
+			goto out_free_bus;
+		gpio_direction_output(bitbang->mdo, 1);
+		gpio_direction_input(bitbang->mdio);
+	}
+
+	gpio_direction_output(bitbang->mdc, 0);
+
+	dev_set_drvdata(dev, new_bus);
+
+	return new_bus;
+
+out_free_bus:
+	free_mdio_bitbang(new_bus);
+out:
+	return NULL;
+}
+
+static void mdio_gpio_bus_deinit(struct device *dev)
+{
+	struct mii_bus *bus = dev_get_drvdata(dev);
+
+	free_mdio_bitbang(bus);
+}
+
+static void mdio_gpio_bus_destroy(struct device *dev)
+{
+	struct mii_bus *bus = dev_get_drvdata(dev);
+
+	mdiobus_unregister(bus);
+	mdio_gpio_bus_deinit(dev);
+}
+
+static int mdio_gpio_probe(struct platform_device *pdev)
+{
+	struct mdio_gpio_platform_data *pdata;
+	struct mii_bus *new_bus;
+	int ret, bus_id;
+
+	if (pdev->dev.of_node) {
+		pdata = mdio_gpio_of_get_data(pdev);
+		bus_id = of_alias_get_id(pdev->dev.of_node, "mdio-gpio");
+		if (bus_id < 0) {
+			dev_warn(&pdev->dev, "failed to get alias id\n");
+			bus_id = 0;
+		}
+	} else {
+		pdata = dev_get_platdata(&pdev->dev);
+		bus_id = pdev->id;
+	}
+
+	if (!pdata)
+		return -ENODEV;
+
+	new_bus = mdio_gpio_bus_init(&pdev->dev, pdata, bus_id);
+	if (!new_bus)
+		return -ENODEV;
+
+	if (pdev->dev.of_node)
+		ret = of_mdiobus_register(new_bus, pdev->dev.of_node);
+	else
+		ret = mdiobus_register(new_bus);
+
+	if (ret)
+		mdio_gpio_bus_deinit(&pdev->dev);
+
+	return ret;
+}
+
+static int mdio_gpio_remove(struct platform_device *pdev)
+{
+	mdio_gpio_bus_destroy(&pdev->dev);
+
+	return 0;
+}
+
+static const struct of_device_id mdio_gpio_of_match[] = {
+	{ .compatible = "virtual,mdio-gpio", },
+	{ /* sentinel */ }
+};
+
+static struct platform_driver mdio_gpio_driver = {
+	.probe = mdio_gpio_probe,
+	.remove = mdio_gpio_remove,
+	.driver		= {
+		.name	= "mdio-gpio",
+		.of_match_table = mdio_gpio_of_match,
+	},
+};
+
+module_platform_driver(mdio_gpio_driver);
+
+MODULE_ALIAS("platform:mdio-gpio");
+MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");