Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760119Ab3EXJXb (ORCPT ); Fri, 24 May 2013 05:23:31 -0400 Received: from mail.free-electrons.com ([94.23.35.102]:48757 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760000Ab3EXJX0 (ORCPT ); Fri, 24 May 2013 05:23:26 -0400 From: Maxime Ripard To: davem@davemloft.net Cc: linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Stefan Roese , Florian Fainelli , Emilio Lopez , kevin@allwinnertech.com, sunny@allwinnertech.com, shuge@allwinnertech.com, Maxime Ripard Subject: [PATCHv3 2/6] net: Add MDIO bus driver for the Allwinner EMAC Date: Fri, 24 May 2013 11:23:10 +0200 Message-Id: <1369387394-9453-3-git-send-email-maxime.ripard@free-electrons.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1369387394-9453-1-git-send-email-maxime.ripard@free-electrons.com> References: <1369387394-9453-1-git-send-email-maxime.ripard@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7958 Lines: 283 This patch adds a separate driver for the MDIO interface of the Allwinner ethernet controllers. Signed-off-by: Maxime Ripard --- .../bindings/net/allwinner,sun4i-mdio.txt | 26 +++ drivers/net/ethernet/allwinner/Kconfig | 8 + drivers/net/ethernet/allwinner/Makefile | 1 + drivers/net/ethernet/allwinner/sun4i-mdio.c | 191 +++++++++++++++++++++ 4 files changed, 226 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/allwinner,sun4i-mdio.txt create mode 100644 drivers/net/ethernet/allwinner/sun4i-mdio.c diff --git a/Documentation/devicetree/bindings/net/allwinner,sun4i-mdio.txt b/Documentation/devicetree/bindings/net/allwinner,sun4i-mdio.txt new file mode 100644 index 0000000..00b9f9a --- /dev/null +++ b/Documentation/devicetree/bindings/net/allwinner,sun4i-mdio.txt @@ -0,0 +1,26 @@ +* Allwinner A10 MDIO Ethernet Controller interface + +Required properties: +- compatible: should be "allwinner,sun4i-mdio". +- reg: address and length of the register set for the device. + +Optional properties: +- phy-supply: phandle to a regulator if the PHY needs one + +Example at the SoC level: +mdio@01c0b080 { + compatible = "allwinner,sun4i-mdio"; + reg = <0x01c0b080 0x14>; + #address-cells = <1>; + #size-cells = <0>; +}; + +And at the board level: + +mdio@01c0b080 { + phy-supply = <®_emac_3v3>; + + phy0: ethernet-phy@0 { + reg = <0>; + }; +}; diff --git a/drivers/net/ethernet/allwinner/Kconfig b/drivers/net/ethernet/allwinner/Kconfig index 4220c9a..848b27a 100644 --- a/drivers/net/ethernet/allwinner/Kconfig +++ b/drivers/net/ethernet/allwinner/Kconfig @@ -27,10 +27,18 @@ config SUN4I_EMAC select NET_CORE select MII select REGULATOR_FIXED_VOLTAGE + select PHYLIB ---help--- Support for Allwinner A10 EMAC ethernet driver. To compile this driver as a module, choose M here. The module will be called sun4i-emac. +config SUN4I_MDIO + tristate "Allwinner sun4i MDIO interface support" + ---help--- + This driver supports the MDIO interface found in the network + interface units of the Allwinner SoC that have an EMAC (A10, + A12, A10s, etc.) + endif # NET_VENDOR_ALLWINNER diff --git a/drivers/net/ethernet/allwinner/Makefile b/drivers/net/ethernet/allwinner/Makefile index 03129f7..95eaa31 100644 --- a/drivers/net/ethernet/allwinner/Makefile +++ b/drivers/net/ethernet/allwinner/Makefile @@ -3,3 +3,4 @@ # obj-$(CONFIG_SUN4I_EMAC) += sun4i-emac.o +obj-$(CONFIG_SUN4I_MDIO) += sun4i-mdio.o \ No newline at end of file diff --git a/drivers/net/ethernet/allwinner/sun4i-mdio.c b/drivers/net/ethernet/allwinner/sun4i-mdio.c new file mode 100644 index 0000000..00e432c --- /dev/null +++ b/drivers/net/ethernet/allwinner/sun4i-mdio.c @@ -0,0 +1,191 @@ +/* + * Allwinner EMAC MDIO interface driver + * + * Copyright 2012-2013 Stefan Roese + * Copyright 2013 Maxime Ripard + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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 start_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 */ + start_jiffies = jiffies; + while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { + if (time_after(start_jiffies, + start_jiffies + MDIO_TIMEOUT)) + 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 start_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 */ + start_jiffies = jiffies; + while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { + if (time_after(start_jiffies, + start_jiffies + MDIO_TIMEOUT)) + 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_reset(struct mii_bus *bus) +{ + 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; + 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; + bus->reset = &sun4i_mdio_reset; + snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev)); + bus->parent = &pdev->dev; + + bus->irq = kmalloc(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; + data->membase = of_iomap(np, 0); + if (!data->membase) { + ret = -ENOMEM; + goto err_out_free_mdio_irq; + } + + 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 + regulator_enable(data->regulator); + + 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_mdio_irq: + kfree(bus->irq); +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); + kfree(bus->irq); + mdiobus_free(bus); + + return 0; +} + +static const struct of_device_id sun4i_mdio_dt_ids[] = { + { .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 "); +MODULE_LICENSE("GPL"); -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/