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Date:   Thu, 11 Apr 2019 02:20:42 +0200
From:   Ondřej Jirman <megous@...ous.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] [PATCH v5 3/5] phy: allwinner: add phy driver for
 USB3 PHY on Allwinner H6 SoC

On Sat, Apr 06, 2019 at 04:57:34AM +0800, Icenowy Zheng wrote:
> 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 <icenowy@...c.io>
> Reviewed-by: Chen-Yu Tsai <wens@...e.org>
> ---
> 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 <icenowy@...c.io>
> + *
> + * Based on phy-sun9i-usb.c, which is:
> + *
> + * Copyright (C) 2014-2015 Chen-Yu Tsai <wens@...e.org>
> + *
> + * 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);

Also of_find_device_by_node takes a reference that needs to be put back in
sun50i_usb3_phy_remove() and error paths. So many refs to take care of,
everywhere. Hmm. :)

I'm just noticing all this now, because I'm writing similar code for
HDMI/connector regualtor borrowing from HDMI controller via of_graph.

regards,
	o.

> +		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 <icenowy@...c.io>");
> +MODULE_LICENSE("GPL");
> -- 
> 2.18.1
> 
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