The MOXA UC-711X hardware(s) has an ethernet controller that seem to be developed internally. The IC used is "RTL8201CP".
This patch adds an MDIO driver which handles the MII bus. Signed-off-by: Jonas Jensen <[email protected]> --- Notes: Thanks for the feedback. Besides what is below I plan to submit changes suggested by Grant as a separate patch (to Documentation/devicetree/bindings/net/phy.txt) Changes since v1: 1. split changes to drivers/net/phy/realtek.c into separate patch driver code: 2. use dev_dbg() instead of dev_err() 3. use id "%s-%d-mii" instead of "%s-mii" 4. call mdiobus_free() on of_mdiobus_register() failure DT binding document: 5. remove it, submitting changes (to Documentation/devicetree/bindings/net/moxa,moxart-mac.txt) along with changes to the driver Applies to next-20131105 drivers/net/phy/Kconfig | 7 ++ drivers/net/phy/Makefile | 1 + drivers/net/phy/mdio-moxart.c | 201 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 209 insertions(+) create mode 100644 drivers/net/phy/mdio-moxart.c diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 342561a..9b5d46c 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -154,6 +154,13 @@ config MDIO_SUN4I interface units of the Allwinner SoC that have an EMAC (A10, A12, A10s, etc.) +config MDIO_MOXART + tristate "MOXA ART MDIO interface support" + depends on ARCH_MOXART + help + This driver supports the MDIO interface found in the network + interface units of the MOXA ART SoC + config MDIO_BUS_MUX tristate depends on OF_MDIO diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile index 23a2ab2..9013dfa 100644 --- a/drivers/net/phy/Makefile +++ b/drivers/net/phy/Makefile @@ -31,3 +31,4 @@ obj-$(CONFIG_MDIO_BUS_MUX) += mdio-mux.o obj-$(CONFIG_MDIO_BUS_MUX_GPIO) += mdio-mux-gpio.o obj-$(CONFIG_MDIO_BUS_MUX_MMIOREG) += mdio-mux-mmioreg.o obj-$(CONFIG_MDIO_SUN4I) += mdio-sun4i.o +obj-$(CONFIG_MDIO_MOXART) += mdio-moxart.o diff --git a/drivers/net/phy/mdio-moxart.c b/drivers/net/phy/mdio-moxart.c new file mode 100644 index 0000000..a5741cb --- /dev/null +++ b/drivers/net/phy/mdio-moxart.c @@ -0,0 +1,201 @@ +/* MOXA ART Ethernet (RTL8201CP) MDIO interface driver + * + * Copyright (C) 2013 Jonas Jensen <[email protected]> + * + * 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/init.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 REG_PHY_CTRL 0 +#define REG_PHY_WRITE_DATA 4 + +/* REG_PHY_CTRL */ +#define MIIWR BIT(27) /* init write sequence (auto cleared)*/ +#define MIIRD BIT(26) +#define REGAD_MASK 0x3e00000 +#define PHYAD_MASK 0x1f0000 +#define MIIRDATA_MASK 0xffff + +/* REG_PHY_WRITE_DATA */ +#define MIIWDATA_MASK 0xffff + +struct moxart_mdio_data { + void __iomem *base; +}; + +static int moxart_mdio_read(struct mii_bus *bus, int mii_id, int regnum) +{ + struct moxart_mdio_data *data = bus->priv; + u32 ctrl = 0; + unsigned int count = 5; + + dev_dbg(&bus->dev, "%s\n", __func__); + + ctrl |= MIIRD | ((mii_id << 16) & PHYAD_MASK) | + ((regnum << 21) & REGAD_MASK); + + writel(ctrl, data->base + REG_PHY_CTRL); + + do { + ctrl = readl(data->base + REG_PHY_CTRL); + + if (!(ctrl & MIIRD)) + return ctrl & MIIRDATA_MASK; + + mdelay(10); + count--; + } while (count > 0); + + dev_dbg(&bus->dev, "%s timed out\n", __func__); + + return -ETIMEDOUT; +} + +static int moxart_mdio_write(struct mii_bus *bus, int mii_id, + int regnum, u16 value) +{ + struct moxart_mdio_data *data = bus->priv; + u32 ctrl = 0; + unsigned int count = 5; + + dev_dbg(&bus->dev, "%s\n", __func__); + + ctrl |= MIIWR | ((mii_id << 16) & PHYAD_MASK) | + ((regnum << 21) & REGAD_MASK); + + value &= MIIWDATA_MASK; + + writel(value, data->base + REG_PHY_WRITE_DATA); + writel(ctrl, data->base + REG_PHY_CTRL); + + do { + ctrl = readl(data->base + REG_PHY_CTRL); + + if (!(ctrl & MIIWR)) + return 0; + + mdelay(10); + count--; + } while (count > 0); + + dev_dbg(&bus->dev, "%s timed out\n", __func__); + + return -ETIMEDOUT; +} + +static int moxart_mdio_reset(struct mii_bus *bus) +{ + int data, i; + + for (i = 0; i < PHY_MAX_ADDR; i++) { + data = moxart_mdio_read(bus, i, MII_BMCR); + if (data < 0) + continue; + + data |= BMCR_RESET; + if (moxart_mdio_write(bus, i, MII_BMCR, data) < 0) + continue; + } + + return 0; +} + +static int moxart_mdio_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct mii_bus *bus; + struct moxart_mdio_data *data; + struct resource *res; + int ret, i; + + bus = mdiobus_alloc_size(sizeof(*data)); + if (!bus) + return -ENOMEM; + + bus->name = "MOXA ART Ethernet MII"; + bus->read = &moxart_mdio_read; + bus->write = &moxart_mdio_write; + bus->reset = &moxart_mdio_reset; + snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d-mii", pdev->name, pdev->id); + 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; + } + + /* Setting PHY_IGNORE_INTERRUPT here even if it has no effect, + * of_mdiobus_register() sets these PHY_POLL. + * Ideally, the interrupt from MAC controller could be used to + * detect link state changes, not polling, i.e. if there was + * a way phy_driver could set PHY_HAS_INTERRUPT but have that + * interrupt handled in ethernet drivercode. + */ + for (i = 0; i < PHY_MAX_ADDR; i++) + bus->irq[i] = PHY_IGNORE_INTERRUPT; + + data = bus->priv; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(data->base)) { + ret = PTR_ERR(data->base); + goto err_out_free_mdiobus; + } + + ret = of_mdiobus_register(bus, np); + if (ret < 0) + goto err_out_free_mdiobus; + + platform_set_drvdata(pdev, bus); + + return 0; + +err_out_free_mdiobus: + mdiobus_free(bus); + return ret; +} + +static int moxart_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 moxart_mdio_dt_ids[] = { + { .compatible = "moxa,moxart-mdio" }, + { } +}; +MODULE_DEVICE_TABLE(of, moxart_mdio_dt_ids); + +static struct platform_driver moxart_mdio_driver = { + .probe = moxart_mdio_probe, + .remove = moxart_mdio_remove, + .driver = { + .name = "moxart-mdio", + .of_match_table = moxart_mdio_dt_ids, + }, +}; + +module_platform_driver(moxart_mdio_driver); + +MODULE_DESCRIPTION("MOXA ART MDIO interface driver"); +MODULE_AUTHOR("Jonas Jensen <[email protected]>"); +MODULE_LICENSE("GPL"); -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
