From 234d6f40fb4b771b396b45a9492aab463771bd0b Mon Sep 17 00:00:00 2001 From: Kristian Evensen Date: Tue, 6 Aug 2019 11:42:57 +0200 Subject: [PATCH] phy: Add ipq40xx mdio driver --- drivers/net/phy/Kconfig | 7 + drivers/net/phy/Makefile | 1 + drivers/net/phy/mdio-ipq40xx.c | 247 +++++++++++++++++++++++++++++++++ 3 files changed, 255 insertions(+) create mode 100644 drivers/net/phy/mdio-ipq40xx.c --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -519,6 +519,13 @@ config XILINX_GMII2RGMII the Reduced Gigabit Media Independent Interface(RGMII) between Ethernet physical media devices and the Gigabit Ethernet controller. +config MDIO_IPQ40XX + tristate "Qualcomm Atheros ipq40xx MDIO interface" + depends on HAS_IOMEM && OF + ---help--- + This driver supports the MDIO interface found in Qualcomm + Atheros ipq40xx Soc chip. + endif # PHYLIB config MICREL_KS8995MA --- a/drivers/net/phy/Makefile +++ b/drivers/net/phy/Makefile @@ -48,6 +48,7 @@ obj-$(CONFIG_MDIO_CAVIUM) += mdio-cavium obj-$(CONFIG_MDIO_GPIO) += mdio-gpio.o obj-$(CONFIG_MDIO_HISI_FEMAC) += mdio-hisi-femac.o obj-$(CONFIG_MDIO_I2C) += mdio-i2c.o +obj-$(CONFIG_MDIO_IPQ40XX) += mdio-ipq40xx.o obj-$(CONFIG_MDIO_MOXART) += mdio-moxart.o obj-$(CONFIG_MDIO_MSCC_MIIM) += mdio-mscc-miim.o obj-$(CONFIG_MDIO_OCTEON) += mdio-octeon.o --- /dev/null +++ b/drivers/net/phy/mdio-ipq40xx.c @@ -0,0 +1,247 @@ +/* + * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved. + * + * Permission to use, copy, modify, and/or distribute this software for + * any purpose with or without fee is hereby granted, provided that the + * above copyright notice and this permission notice appear in all copies. + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT + * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MDIO_CTRL_0_REG 0x40 +#define MDIO_CTRL_1_REG 0x44 +#define MDIO_CTRL_2_REG 0x48 +#define MDIO_CTRL_3_REG 0x4c +#define MDIO_CTRL_4_REG 0x50 +#define MDIO_CTRL_4_ACCESS_BUSY BIT(16) +#define MDIO_CTRL_4_ACCESS_START BIT(8) +#define MDIO_CTRL_4_ACCESS_CODE_READ 0 +#define MDIO_CTRL_4_ACCESS_CODE_WRITE 1 +#define CTRL_0_REG_DEFAULT_VALUE 0x150FF + +#define IPQ40XX_MDIO_RETRY 1000 +#define IPQ40XX_MDIO_DELAY 10 + +struct ipq40xx_mdio_data { + struct mii_bus *mii_bus; + void __iomem *membase; + struct device *dev; +}; + +static int ipq40xx_mdio_wait_busy(struct ipq40xx_mdio_data *am) +{ + int i; + + for (i = 0; i < IPQ40XX_MDIO_RETRY; i++) { + unsigned int busy; + + busy = readl(am->membase + MDIO_CTRL_4_REG) & + MDIO_CTRL_4_ACCESS_BUSY; + if (!busy) + return 0; + + /* BUSY might take to be cleard by 15~20 times of loop */ + udelay(IPQ40XX_MDIO_DELAY); + } + + dev_err(am->dev, "%s: MDIO operation timed out\n", am->mii_bus->name); + + return -ETIMEDOUT; +} + +static int ipq40xx_mdio_read(struct mii_bus *bus, int mii_id, int regnum) +{ + struct ipq40xx_mdio_data *am = bus->priv; + int value = 0; + unsigned int cmd = 0; + + lockdep_assert_held(&bus->mdio_lock); + + if (ipq40xx_mdio_wait_busy(am)) + return -ETIMEDOUT; + + /* issue the phy address and reg */ + writel((mii_id << 8) | regnum, am->membase + MDIO_CTRL_1_REG); + + cmd = MDIO_CTRL_4_ACCESS_START|MDIO_CTRL_4_ACCESS_CODE_READ; + + /* issue read command */ + writel(cmd, am->membase + MDIO_CTRL_4_REG); + + /* Wait read complete */ + if (ipq40xx_mdio_wait_busy(am)) + return -ETIMEDOUT; + + /* Read data */ + value = readl(am->membase + MDIO_CTRL_3_REG); + + return value; +} + +static int ipq40xx_mdio_write(struct mii_bus *bus, int mii_id, int regnum, + u16 value) +{ + struct ipq40xx_mdio_data *am = bus->priv; + unsigned int cmd = 0; + + lockdep_assert_held(&bus->mdio_lock); + + if (ipq40xx_mdio_wait_busy(am)) + return -ETIMEDOUT; + + /* issue the phy address and reg */ + writel((mii_id << 8) | regnum, am->membase + MDIO_CTRL_1_REG); + + /* issue write data */ + writel(value, am->membase + MDIO_CTRL_2_REG); + + cmd = MDIO_CTRL_4_ACCESS_START|MDIO_CTRL_4_ACCESS_CODE_WRITE; + /* issue write command */ + writel(cmd, am->membase + MDIO_CTRL_4_REG); + + /* Wait write complete */ + if (ipq40xx_mdio_wait_busy(am)) + return -ETIMEDOUT; + + return 0; +} + +static int ipq40xx_phy_reset(struct platform_device *pdev) +{ + struct device_node *mdio_node; + int phy_reset_gpio_number; + int ret; + + mdio_node = of_find_node_by_name(NULL, "mdio"); + if (!mdio_node) { + dev_err(&pdev->dev, "Could not find mdio node\n"); + return 0; + } + + ret = of_get_named_gpio(mdio_node, "phy-reset-gpio", 0); + if (ret < 0) { + dev_err(&pdev->dev, "Could not find phy-reset-gpio\n"); + return 0; + } + + phy_reset_gpio_number = ret; + + ret = gpio_request(phy_reset_gpio_number, "phy-reset-gpio"); + if (ret) { + dev_err(&pdev->dev, "Can't get phy-reset-gpio %d\n", ret); + return ret; + } + + ret = gpio_direction_output(phy_reset_gpio_number, 0x0); + if (ret) { + dev_err(&pdev->dev, + "Can't set direction for phy-reset-gpio %d\n", ret); + goto phy_reset_out; + } + + usleep_range(1000, 10005); + + gpio_set_value(phy_reset_gpio_number, 0x01); + +phy_reset_out: + gpio_free(phy_reset_gpio_number); + + return ret; +} + +static int ipq40xx_mdio_probe(struct platform_device *pdev) +{ + struct ipq40xx_mdio_data *am; + struct resource *res; + int i, ret; + + ret = ipq40xx_phy_reset(pdev); + if (ret) { + dev_err(&pdev->dev, "Could not find qca8075 reset gpio\n"); + return -ENODEV; + } + + am = devm_kzalloc(&pdev->dev, sizeof(*am), GFP_KERNEL); + if (!am) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "no iomem resource found\n"); + return -ENXIO; + } + + am->membase = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(am->membase)) { + dev_err(&pdev->dev, "unable to ioremap registers\n"); + return PTR_ERR(am->membase); + } + + am->mii_bus = devm_mdiobus_alloc(&pdev->dev); + if (!am->mii_bus) + return -ENOMEM; + + writel(CTRL_0_REG_DEFAULT_VALUE, am->membase + MDIO_CTRL_0_REG); + + am->mii_bus->name = "ipq40xx_mdio"; + am->mii_bus->read = ipq40xx_mdio_read; + am->mii_bus->write = ipq40xx_mdio_write; + am->mii_bus->priv = am; + am->mii_bus->parent = &pdev->dev; + snprintf(am->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(&pdev->dev)); + + am->dev = &pdev->dev; + platform_set_drvdata(pdev, am); + + return of_mdiobus_register(am->mii_bus, pdev->dev.of_node); +} + +static int ipq40xx_mdio_remove(struct platform_device *pdev) +{ + struct ipq40xx_mdio_data *am = platform_get_drvdata(pdev); + + mdiobus_unregister(am->mii_bus); + + return 0; +} + +static const struct of_device_id ipq40xx_mdio_dt_ids[] = { + { .compatible = "qcom,ipq4019-mdio" }, + { } +}; +MODULE_DEVICE_TABLE(of, ipq40xx_mdio_dt_ids); + +static struct platform_driver ipq40xx_mdio_driver = { + .probe = ipq40xx_mdio_probe, + .remove = ipq40xx_mdio_remove, + .driver = { + .name = "ipq40xx-mdio", + .of_match_table = ipq40xx_mdio_dt_ids, + }, +}; + +module_platform_driver(ipq40xx_mdio_driver); + +#define DRV_VERSION "1.0" + +MODULE_DESCRIPTION("IPQ40XX MDIO interface driver"); +MODULE_AUTHOR("Qualcomm Atheros"); +MODULE_VERSION(DRV_VERSION); +MODULE_LICENSE("Dual BSD/GPL");