Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / net / phy / mdio-sun4i.c

diff --git a/kernel/drivers/net/phy/mdio-sun4i.c b/kernel/drivers/net/phy/mdio-sun4i.c
new file mode 100644 (file)
index 0000000..15bc7f9
--- /dev/null
+++ b/kernel/drivers/net/phy/mdio-sun4i.c
@@ -0,0 +1,188 @@
+/*
+ * Allwinner EMAC MDIO interface driver
+ *
+ * Copyright 2012-2013 Stefan Roese <sr@denx.de>
+ * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * Based on the Linux driver provided by Allwinner:
+ * Copyright (C) 1997  Sten Wang
+ *
+ * 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/delay.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_address.h>
+#include <linux/of_mdio.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+
+#define EMAC_MAC_MCMD_REG      (0x00)
+#define EMAC_MAC_MADR_REG      (0x04)
+#define EMAC_MAC_MWTD_REG      (0x08)
+#define EMAC_MAC_MRDD_REG      (0x0c)
+#define EMAC_MAC_MIND_REG      (0x10)
+#define EMAC_MAC_SSRR_REG      (0x14)
+
+#define MDIO_TIMEOUT           (msecs_to_jiffies(100))
+
+struct sun4i_mdio_data {
+       void __iomem            *membase;
+       struct regulator        *regulator;
+};
+
+static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
+{
+       struct sun4i_mdio_data *data = bus->priv;
+       unsigned long timeout_jiffies;
+       int value;
+
+       /* issue the phy address and reg */
+       writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);
+       /* pull up the phy io line */
+       writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
+
+       /* Wait read complete */
+       timeout_jiffies = jiffies + MDIO_TIMEOUT;
+       while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
+               if (time_is_before_jiffies(timeout_jiffies))
+                       return -ETIMEDOUT;
+               msleep(1);
+       }
+
+       /* push down the phy io line */
+       writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
+       /* and read data */
+       value = readl(data->membase + EMAC_MAC_MRDD_REG);
+
+       return value;
+}
+
+static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
+                           u16 value)
+{
+       struct sun4i_mdio_data *data = bus->priv;
+       unsigned long timeout_jiffies;
+
+       /* issue the phy address and reg */
+       writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);
+       /* pull up the phy io line */
+       writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
+
+       /* Wait read complete */
+       timeout_jiffies = jiffies + MDIO_TIMEOUT;
+       while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
+               if (time_is_before_jiffies(timeout_jiffies))
+                       return -ETIMEDOUT;
+               msleep(1);
+       }
+
+       /* push down the phy io line */
+       writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
+       /* and write data */
+       writel(value, data->membase + EMAC_MAC_MWTD_REG);
+
+       return 0;
+}
+
+static int sun4i_mdio_probe(struct platform_device *pdev)
+{
+       struct device_node *np = pdev->dev.of_node;
+       struct mii_bus *bus;
+       struct sun4i_mdio_data *data;
+       struct resource *res;
+       int ret, i;
+
+       bus = mdiobus_alloc_size(sizeof(*data));
+       if (!bus)
+               return -ENOMEM;
+
+       bus->name = "sun4i_mii_bus";
+       bus->read = &sun4i_mdio_read;
+       bus->write = &sun4i_mdio_write;
+       snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
+       bus->parent = &pdev->dev;
+
+       bus->irq = devm_kzalloc(&pdev->dev, sizeof(int) * PHY_MAX_ADDR,
+                       GFP_KERNEL);
+       if (!bus->irq) {
+               ret = -ENOMEM;
+               goto err_out_free_mdiobus;
+       }
+
+       for (i = 0; i < PHY_MAX_ADDR; i++)
+               bus->irq[i] = PHY_POLL;
+
+       data = bus->priv;
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       data->membase = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(data->membase)) {
+               ret = PTR_ERR(data->membase);
+               goto err_out_free_mdiobus;
+       }
+
+       data->regulator = devm_regulator_get(&pdev->dev, "phy");
+       if (IS_ERR(data->regulator)) {
+               if (PTR_ERR(data->regulator) == -EPROBE_DEFER)
+                       return -EPROBE_DEFER;
+
+               dev_info(&pdev->dev, "no regulator found\n");
+       } else {
+               ret = regulator_enable(data->regulator);
+               if (ret)
+                       goto err_out_free_mdiobus;
+       }
+
+       ret = of_mdiobus_register(bus, np);
+       if (ret < 0)
+               goto err_out_disable_regulator;
+
+       platform_set_drvdata(pdev, bus);
+
+       return 0;
+
+err_out_disable_regulator:
+       regulator_disable(data->regulator);
+err_out_free_mdiobus:
+       mdiobus_free(bus);
+       return ret;
+}
+
+static int sun4i_mdio_remove(struct platform_device *pdev)
+{
+       struct mii_bus *bus = platform_get_drvdata(pdev);
+
+       mdiobus_unregister(bus);
+       mdiobus_free(bus);
+
+       return 0;
+}
+
+static const struct of_device_id sun4i_mdio_dt_ids[] = {
+       { .compatible = "allwinner,sun4i-a10-mdio" },
+
+       /* Deprecated */
+       { .compatible = "allwinner,sun4i-mdio" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, sun4i_mdio_dt_ids);
+
+static struct platform_driver sun4i_mdio_driver = {
+       .probe = sun4i_mdio_probe,
+       .remove = sun4i_mdio_remove,
+       .driver = {
+               .name = "sun4i-mdio",
+               .of_match_table = sun4i_mdio_dt_ids,
+       },
+};
+
+module_platform_driver(sun4i_mdio_driver);
+
+MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver");
+MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
+MODULE_LICENSE("GPL");