[PATCH net-next v13 2/3] net: hisilicon: new hip04 MDIO driver

Ding Tianhong
2015-01-14T06:34:13Z

From: Zhangfei Gao <zhangfei.gao@linaro.org>

Hisilicon hip04 platform mdio driver
Reuse Marvell phy drivers/net/phy/marvell.c

Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
---
drivers/net/ethernet/hisilicon/Kconfig | 9 ++
drivers/net/ethernet/hisilicon/Makefile | 1 +
drivers/net/ethernet/hisilicon/hip04_mdio.c | 186 ++++++++++++++++++++++++++++
3 files changed, 196 insertions(+)
create mode 100644 drivers/net/ethernet/hisilicon/hip04_mdio.c

diff --git a/drivers/net/ethernet/hisilicon/Kconfig b/drivers/net/ethernet/hisilicon/Kconfig
index e942173..a54d897 100644
--- a/drivers/net/ethernet/hisilicon/Kconfig
+++ b/drivers/net/ethernet/hisilicon/Kconfig
@@ -24,4 +24,13 @@ config HIX5HD2_GMAC
help
This selects the hix5hd2 mac family network device.

+config HIP04_ETH
+ tristate "HISILICON P04 Ethernet support"
+ select PHYLIB
+ select MARVELL_PHY
+ select MFD_SYSCON
+ ---help---
+ If you wish to compile a kernel for a hardware with hisilicon p04 SoC and
+ want to use the internal ethernet then you should answer Y to this.
+
endif # NET_VENDOR_HISILICON
diff --git a/drivers/net/ethernet/hisilicon/Makefile b/drivers/net/ethernet/hisilicon/Makefile
index 9175e846..40115a7 100644
--- a/drivers/net/ethernet/hisilicon/Makefile
+++ b/drivers/net/ethernet/hisilicon/Makefile
@@ -3,3 +3,4 @@
#

obj-$(CONFIG_HIX5HD2_GMAC) += hix5hd2_gmac.o
+obj-$(CONFIG_HIP04_ETH) += hip04_mdio.o
diff --git a/drivers/net/ethernet/hisilicon/hip04_mdio.c b/drivers/net/ethernet/hisilicon/hip04_mdio.c
new file mode 100644
index 0000000..b3bac25
--- /dev/null
+++ b/drivers/net/ethernet/hisilicon/hip04_mdio.c
@@ -0,0 +1,186 @@
+/* Copyright (c) 2014 Linaro Ltd.
+ * Copyright (c) 2014 Hisilicon Limited.
+ *
+ * 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/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of_mdio.h>
+#include <linux/delay.h>
+
+#define MDIO_CMD_REG 0x0
+#define MDIO_ADDR_REG 0x4
+#define MDIO_WDATA_REG 0x8
+#define MDIO_RDATA_REG 0xc
+#define MDIO_STA_REG 0x10
+
+#define MDIO_START BIT(14)
+#define MDIO_R_VALID BIT(1)
+#define MDIO_READ (BIT(12) | BIT(11) | MDIO_START)
+#define MDIO_WRITE (BIT(12) | BIT(10) | MDIO_START)
+
+struct hip04_mdio_priv {
+ void __iomem *base;
+};
+
+#define WAIT_TIMEOUT 10
+static int hip04_mdio_wait_ready(struct mii_bus *bus)
+{
+ struct hip04_mdio_priv *priv = bus->priv;
+ int i;
+
+ for (i = 0; readl_relaxed(priv->base + MDIO_CMD_REG) & MDIO_START; i++) {
+ if (i == WAIT_TIMEOUT)
+ return -ETIMEDOUT;
+ msleep(20);
+ }
+
+ return 0;
+}
+
+static int hip04_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
+{
+ struct hip04_mdio_priv *priv = bus->priv;
+ u32 val;
+ int ret;
+
+ ret = hip04_mdio_wait_ready(bus);
+ if (ret < 0)
+ goto out;
+
+ val = regnum | (mii_id << 5) | MDIO_READ;
+ writel_relaxed(val, priv->base + MDIO_CMD_REG);
+
+ ret = hip04_mdio_wait_ready(bus);
+ if (ret < 0)
+ goto out;
+
+ val = readl_relaxed(priv->base + MDIO_STA_REG);
+ if (val & MDIO_R_VALID) {
+ dev_err(bus->parent, "SMI bus read not valid\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ val = readl_relaxed(priv->base + MDIO_RDATA_REG);
+ ret = val & 0xFFFF;
+out:
+ return ret;
+}
+
+static int hip04_mdio_write(struct mii_bus *bus, int mii_id,
+ int regnum, u16 value)
+{
+ struct hip04_mdio_priv *priv = bus->priv;
+ u32 val;
+ int ret;
+
+ ret = hip04_mdio_wait_ready(bus);
+ if (ret < 0)
+ goto out;
+
+ writel_relaxed(value, priv->base + MDIO_WDATA_REG);
+ val = regnum | (mii_id << 5) | MDIO_WRITE;
+ writel_relaxed(val, priv->base + MDIO_CMD_REG);
+out:
+ return ret;
+}
+
+static int hip04_mdio_reset(struct mii_bus *bus)
+{
+ int temp, i;
+
+ for (i = 0; i < PHY_MAX_ADDR; i++) {
+ hip04_mdio_write(bus, i, 22, 0);
+ temp = hip04_mdio_read(bus, i, MII_BMCR);
+ if (temp < 0)
+ continue;
+
+ temp |= BMCR_RESET;
+ if (hip04_mdio_write(bus, i, MII_BMCR, temp) < 0)
+ continue;
+ }
+
+ mdelay(500);
+ return 0;
+}
+
+static int hip04_mdio_probe(struct platform_device *pdev)
+{
+ struct resource *r;
+ struct mii_bus *bus;
+ struct hip04_mdio_priv *priv;
+ int ret;
+
+ bus = mdiobus_alloc_size(sizeof(struct hip04_mdio_priv));
+ if (!bus) {
+ dev_err(&pdev->dev, "Cannot allocate MDIO bus\n");
+ return -ENOMEM;
+ }
+
+ bus->name = "hip04_mdio_bus";
+ bus->read = hip04_mdio_read;
+ bus->write = hip04_mdio_write;
+ bus->reset = hip04_mdio_reset;
+ snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
+ bus->parent = &pdev->dev;
+ priv = bus->priv;
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->base = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(priv->base)) {
+ ret = PTR_ERR(priv->base);
+ goto out_mdio;
+ }
+
+ ret = of_mdiobus_register(bus, pdev->dev.of_node);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Cannot register MDIO bus (%d)\n", ret);
+ goto out_mdio;
+ }
+
+ platform_set_drvdata(pdev, bus);
+
+ return 0;
+
+out_mdio:
+ mdiobus_free(bus);
+ return ret;
+}
+
+static int hip04_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 hip04_mdio_match[] = {
+ { .compatible = "hisilicon,hip04-mdio" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, hip04_mdio_match);
+
+static struct platform_driver hip04_mdio_driver = {
+ .probe = hip04_mdio_probe,
+ .remove = hip04_mdio_remove,
+ .driver = {
+ .name = "hip04-mdio",
+ .owner = THIS_MODULE,
+ .of_match_table = hip04_mdio_match,
+ },
+};
+
+module_platform_driver(hip04_mdio_driver);
+
+MODULE_DESCRIPTION("HISILICON P04 MDIO interface driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:hip04-mdio");
--
1.8.0