Allwinner H6 SoC contains a USB3 PHY (with USB2 DP/DM lines also controlled).
Add a driver for it. The register operations in this driver is mainly extracted from the BSP USB3 driver. Signed-off-by: Icenowy Zheng <[email protected]> Reviewed-by: Chen-Yu Tsai <[email protected]> --- Changes in v5: - Dropped support for vbus-supply property in the device node itself and added support for vbus-supply property in the connector subnode. Changes in v4: - Added support for vbus-supply property. Changes in v3: - Dropped USB_SUPPORT dependency. - Added Chen-Yu's Review tag. No changes in v2, v1. drivers/phy/allwinner/Kconfig | 12 ++ drivers/phy/allwinner/Makefile | 1 + drivers/phy/allwinner/phy-sun50i-usb3.c | 260 ++++++++++++++++++++++++ 3 files changed, 273 insertions(+) create mode 100644 drivers/phy/allwinner/phy-sun50i-usb3.c diff --git a/drivers/phy/allwinner/Kconfig b/drivers/phy/allwinner/Kconfig index fb1204bcc454..2c363db177f2 100644 --- a/drivers/phy/allwinner/Kconfig +++ b/drivers/phy/allwinner/Kconfig @@ -41,3 +41,15 @@ config PHY_SUN9I_USB sun9i SoCs. This driver controls each individual USB 2 host PHY. + +config PHY_SUN50I_USB3 + tristate "Allwinner sun50i SoC USB3 PHY driver" + depends on ARCH_SUNXI && HAS_IOMEM && OF + depends on RESET_CONTROLLER + select USB_COMMON + select GENERIC_PHY + help + Enable this to support the USB3.0-capable transceiver that is + part of some Allwinner sun50i SoCs. + + This driver controls each individual USB 2+3 host PHY combo. diff --git a/drivers/phy/allwinner/Makefile b/drivers/phy/allwinner/Makefile index 7d0053efbfaa..59575a895779 100644 --- a/drivers/phy/allwinner/Makefile +++ b/drivers/phy/allwinner/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_PHY_SUN4I_USB) += phy-sun4i-usb.o obj-$(CONFIG_PHY_SUN6I_MIPI_DPHY) += phy-sun6i-mipi-dphy.o obj-$(CONFIG_PHY_SUN9I_USB) += phy-sun9i-usb.o +obj-$(CONFIG_PHY_SUN50I_USB3) += phy-sun50i-usb3.o diff --git a/drivers/phy/allwinner/phy-sun50i-usb3.c b/drivers/phy/allwinner/phy-sun50i-usb3.c new file mode 100644 index 000000000000..5299aef98668 --- /dev/null +++ b/drivers/phy/allwinner/phy-sun50i-usb3.c @@ -0,0 +1,260 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Allwinner sun50i(H6) USB 3.0 phy driver + * + * Copyright (C) 2017 Icenowy Zheng <[email protected]> + * + * Based on phy-sun9i-usb.c, which is: + * + * Copyright (C) 2014-2015 Chen-Yu Tsai <[email protected]> + * + * Based on code from Allwinner BSP, which is: + * + * Copyright (c) 2010-2015 Allwinner Technology Co., Ltd. + */ + +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/phy/phy.h> +#include <linux/of_platform.h> +#include <linux/usb/of.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/reset.h> + +/* Interface Status and Control Registers */ +#define SUNXI_ISCR 0x00 +#define SUNXI_PIPE_CLOCK_CONTROL 0x14 +#define SUNXI_PHY_TUNE_LOW 0x18 +#define SUNXI_PHY_TUNE_HIGH 0x1c +#define SUNXI_PHY_EXTERNAL_CONTROL 0x20 + +/* USB2.0 Interface Status and Control Register */ +#define SUNXI_ISCR_FORCE_VBUS (3 << 12) + +/* PIPE Clock Control Register */ +#define SUNXI_PCC_PIPE_CLK_OPEN (1 << 6) + +/* PHY External Control Register */ +#define SUNXI_PEC_EXTERN_VBUS (3 << 1) +#define SUNXI_PEC_SSC_EN (1 << 24) +#define SUNXI_PEC_REF_SSP_EN (1 << 26) + +/* PHY Tune High Register */ +#define SUNXI_TX_DEEMPH_3P5DB(n) ((n) << 19) +#define SUNXI_TX_DEEMPH_3P5DB_MASK GENMASK(24, 19) +#define SUNXI_TX_DEEMPH_6DB(n) ((n) << 13) +#define SUNXI_TX_DEEMPH_6GB_MASK GENMASK(18, 13) +#define SUNXI_TX_SWING_FULL(n) ((n) << 6) +#define SUNXI_TX_SWING_FULL_MASK GENMASK(12, 6) +#define SUNXI_LOS_BIAS(n) ((n) << 3) +#define SUNXI_LOS_BIAS_MASK GENMASK(5, 3) +#define SUNXI_TXVBOOSTLVL(n) ((n) << 0) +#define SUNXI_TXVBOOSTLVL_MASK GENMASK(0, 2) + +struct sun50i_usb3_phy { + struct phy *phy; + void __iomem *regs; + struct reset_control *reset; + struct clk *clk; + struct platform_device *connector_dev; + struct regulator *vbus; +}; + +static void sun50i_usb3_phy_open(struct sun50i_usb3_phy *phy) +{ + u32 val; + + val = readl(phy->regs + SUNXI_PHY_EXTERNAL_CONTROL); + val |= SUNXI_PEC_EXTERN_VBUS; + val |= SUNXI_PEC_SSC_EN | SUNXI_PEC_REF_SSP_EN; + writel(val, phy->regs + SUNXI_PHY_EXTERNAL_CONTROL); + + val = readl(phy->regs + SUNXI_PIPE_CLOCK_CONTROL); + val |= SUNXI_PCC_PIPE_CLK_OPEN; + writel(val, phy->regs + SUNXI_PIPE_CLOCK_CONTROL); + + val = readl(phy->regs + SUNXI_ISCR); + val |= SUNXI_ISCR_FORCE_VBUS; + writel(val, phy->regs + SUNXI_ISCR); + + /* + * All the magic numbers written to the PHY_TUNE_{LOW_HIGH} + * registers are directly taken from the BSP USB3 driver from + * Allwiner. + */ + writel(0x0047fc87, phy->regs + SUNXI_PHY_TUNE_LOW); + + val = readl(phy->regs + SUNXI_PHY_TUNE_HIGH); + val &= ~(SUNXI_TXVBOOSTLVL_MASK | SUNXI_LOS_BIAS_MASK | + SUNXI_TX_SWING_FULL_MASK | SUNXI_TX_DEEMPH_6GB_MASK | + SUNXI_TX_DEEMPH_3P5DB_MASK); + val |= SUNXI_TXVBOOSTLVL(0x7); + val |= SUNXI_LOS_BIAS(0x7); + val |= SUNXI_TX_SWING_FULL(0x55); + val |= SUNXI_TX_DEEMPH_6DB(0x20); + val |= SUNXI_TX_DEEMPH_3P5DB(0x15); + writel(val, phy->regs + SUNXI_PHY_TUNE_HIGH); +} + +static int sun50i_usb3_phy_init(struct phy *_phy) +{ + struct sun50i_usb3_phy *phy = phy_get_drvdata(_phy); + int ret; + + ret = clk_prepare_enable(phy->clk); + if (ret) + goto err_clk; + + ret = reset_control_deassert(phy->reset); + if (ret) + goto err_reset; + + sun50i_usb3_phy_open(phy); + return 0; + +err_reset: + clk_disable_unprepare(phy->clk); + +err_clk: + return ret; +} + +static int sun50i_usb3_phy_exit(struct phy *_phy) +{ + struct sun50i_usb3_phy *phy = phy_get_drvdata(_phy); + + reset_control_assert(phy->reset); + clk_disable_unprepare(phy->clk); + + return 0; +} + +static int sun50i_usb3_phy_power_on(struct phy *_phy) +{ + struct sun50i_usb3_phy *phy = phy_get_drvdata(_phy); + + if (phy->vbus) + return regulator_enable(phy->vbus); + else + return 0; +} + +static int sun50i_usb3_phy_power_off(struct phy *_phy) +{ + struct sun50i_usb3_phy *phy = phy_get_drvdata(_phy); + + if (phy->vbus) + return regulator_disable(phy->vbus); + else + return 0; +} + +static const struct phy_ops sun50i_usb3_phy_ops = { + .init = sun50i_usb3_phy_init, + .exit = sun50i_usb3_phy_exit, + .power_on = sun50i_usb3_phy_power_on, + .power_off = sun50i_usb3_phy_power_off, + .owner = THIS_MODULE, +}; + +static int sun50i_usb3_phy_probe(struct platform_device *pdev) +{ + struct sun50i_usb3_phy *phy; + struct device *dev = &pdev->dev; + struct phy_provider *phy_provider; + struct resource *res; + struct device_node *connector_node; + int ret; + + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENOMEM; + + dev_set_drvdata(dev, phy); + + phy->clk = devm_clk_get(dev, NULL); + if (IS_ERR(phy->clk)) { + dev_err(dev, "failed to get phy clock\n"); + return PTR_ERR(phy->clk); + } + + phy->reset = devm_reset_control_get(dev, NULL); + if (IS_ERR(phy->reset)) { + dev_err(dev, "failed to get reset control\n"); + return PTR_ERR(phy->reset); + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + phy->regs = devm_ioremap_resource(dev, res); + if (IS_ERR(phy->regs)) + return PTR_ERR(phy->regs); + + /* Populate the connector as platform device */ + ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); + if (ret) + return ret; + + /* + * Currently the Allwinner USB3 PHY contains only one port, so we + * only process one connector now. + */ + connector_node = of_get_next_child(pdev->dev.of_node, NULL); + + if (connector_node) { + /* Get the platform device */ + phy->connector_dev = of_find_device_by_node(connector_node); + if (!phy->connector_dev) { + dev_err(dev, "no device for connector\n"); + return -ENODEV; + } + + phy->vbus = regulator_get(&phy->connector_dev->dev, "vbus"); + if (IS_ERR(phy->vbus)) + return PTR_ERR(phy->vbus); + } + + phy->phy = devm_phy_create(dev, NULL, &sun50i_usb3_phy_ops); + if (IS_ERR(phy->phy)) { + dev_err(dev, "failed to create PHY\n"); + return PTR_ERR(phy->phy); + } + + phy_set_drvdata(phy->phy, phy); + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static int sun50i_usb3_phy_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct sun50i_usb3_phy *phy = dev_get_drvdata(dev); + + if (phy->vbus) + regulator_put(phy->vbus); + + return 0; +} + +static const struct of_device_id sun50i_usb3_phy_of_match[] = { + { .compatible = "allwinner,sun50i-h6-usb3-phy" }, + { }, +}; +MODULE_DEVICE_TABLE(of, sun50i_usb3_phy_of_match); + +static struct platform_driver sun50i_usb3_phy_driver = { + .probe = sun50i_usb3_phy_probe, + .remove = sun50i_usb3_phy_remove, + .driver = { + .of_match_table = sun50i_usb3_phy_of_match, + .name = "sun50i-usb3-phy", + } +}; +module_platform_driver(sun50i_usb3_phy_driver); + +MODULE_DESCRIPTION("Allwinner sun50i USB 3.0 phy driver"); +MODULE_AUTHOR("Icenowy Zheng <[email protected]>"); +MODULE_LICENSE("GPL"); -- 2.18.1 -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
