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Date:	Fri, 18 Sep 2015 04:29:18 +0000
From:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:	"kishon@...com" <kishon@...com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>
Subject: RE: [PATCH] phy: rcar-gen3-usb2: Add R-Car Gen3 USB2 PHY driver

Hi Kishon,

> Sent: Tuesday, August 25, 2015 6:11 PM
> 
> This patch adds support for R-Car generation 3 USB2 PHY driver.
> This SoC has 3 EHCI/OHCI channels, and the channel 0 is shared
> with the HSUSB (USB2.0 peripheral) device.
> 
> So, the purpose of this driver is:
>  1) initializes some registers of SoC specific to use the
>     {ehci,ohci}-platform driver.
> 
>  2) detects id pin to select host or peripheral on the channel 0.
> 
> For now, this driver only supports 1) above.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> ---
>  This patch is based on the latest linux-phy / next branch.
>  (commit id = cfd093bbb5fe84ec8c7bb069fe618159a8b601f5)

Would you review this patch? Since the latest linux-phy.git / next branch
is the same as the above id, this patch can be applied on the repository, I think.

Best regards,
Yoshihiro Shimoda

>  Changes from v1:
>   - Revise some typos.
>   - Remove using clk API to enable/disable the clocks.
>     (In other words, this driver expects to enable/disable the clocks by
>      Runtime PM API by the phy-core driver.)
>   - Remove an unnecessary header file (asm/cmpxchg.h).
> 
>  .../devicetree/bindings/phy/rcar-gen3-phy-usb2.txt |  35 +++
>  drivers/phy/Kconfig                                |   6 +
>  drivers/phy/Makefile                               |   1 +
>  drivers/phy/phy-rcar-gen3-usb2.c                   | 240 +++++++++++++++++++++
>  4 files changed, 282 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
>  create mode 100644 drivers/phy/phy-rcar-gen3-usb2.c
> 
> diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> new file mode 100644
> index 0000000..1d57766
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> @@ -0,0 +1,35 @@
> +* Renesas R-Car generation 3 USB 2.0 PHY
> +
> +This file provides information on what the device node for the R-Car generation
> +3 USB 2.0 PHY contains.
> +
> +Required properties:
> +- compatible: "renesas,usb2-phy-r8a7795" if the device is a part of an R8A7795
> +	      SoC.
> +- reg: offset and length of the USB2.0 host register block.
> +- reg-names: must be "usb2".
> +- clocks: clock phandle and specifier pair(s).
> +- #phy-cells: see phy-bindings.txt in the same directory, must be <0>.
> +
> +Optional properties:
> +To use a USB channel where EHCI/OHCI and HSUSB are combined, the device tree
> +node should set HSUSB properties to reg and reg-names properties:
> +- reg: offset and length of the HSUSB register block.
> +- reg-names: must be "hsusb".
> +
> +Example (R-Car H3):
> +
> +	usb-phy@...80200 {
> +		compatible = "renesas,usb2-phy-r8a7795";
> +		reg = <0 0xee080200 0 0x6ff>, <0 0xe6590100 0 0x100>;
> +		reg-names = "usb2", "hsusb";
> +		clocks = <&mstp7_clks R8A7795_CLK_EHCI0>,
> +			 <&mstp7_clks R8A7795_CLK_HSUSB>;
> +	};
> +
> +	usb-phy@...a0200 {
> +		compatible = "renesas,usb2-phy-r8a7795";
> +		reg = <0 0xee0a0200 0 0x6ff>;
> +		reg-names = "usb2";
> +		clocks = <&mstp7_clks R8A7795_CLK_EHCI0>;
> +	};
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 0fe9bff..406dc43 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -116,6 +116,12 @@ config PHY_RCAR_GEN2
>  	help
>  	  Support for USB PHY found on Renesas R-Car generation 2 SoCs.
> 
> +config PHY_RCAR_GEN3_USB2
> +	tristate "Renesas R-Car generation 3 USB 2.0 PHY driver"
> +	depends on GENERIC_PHY
> +	help
> +	  Support for USB 2.0 PHY found on Renesas R-Car generation 3 SoCs.
> +
>  config OMAP_CONTROL_PHY
>  	tristate "OMAP CONTROL PHY Driver"
>  	depends on ARCH_OMAP2PLUS || COMPILE_TEST
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index a5b18c1..97e83bc 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_PHY_MVEBU_SATA)		+= phy-mvebu-sata.o
>  obj-$(CONFIG_PHY_MIPHY28LP) 		+= phy-miphy28lp.o
>  obj-$(CONFIG_PHY_MIPHY365X)		+= phy-miphy365x.o
>  obj-$(CONFIG_PHY_RCAR_GEN2)		+= phy-rcar-gen2.o
> +obj-$(CONFIG_PHY_RCAR_GEN3_USB2)	+= phy-rcar-gen3-usb2.o
>  obj-$(CONFIG_OMAP_CONTROL_PHY)		+= phy-omap-control.o
>  obj-$(CONFIG_OMAP_USB2)			+= phy-omap-usb2.o
>  obj-$(CONFIG_TI_PIPE3)			+= phy-ti-pipe3.o
> diff --git a/drivers/phy/phy-rcar-gen3-usb2.c b/drivers/phy/phy-rcar-gen3-usb2.c
> new file mode 100644
> index 0000000..2c2fcf9
> --- /dev/null
> +++ b/drivers/phy/phy-rcar-gen3-usb2.c
> @@ -0,0 +1,240 @@
> +/*
> + * Renesas R-Car Gen3 for USB2.0 PHY driver
> + *
> + * Copyright (C) 2015 Renesas Electronics Corporation
> + *
> + * This is based on the phy-rcar-gen2 driver:
> + * Copyright (C) 2014 Renesas Solutions Corp.
> + * Copyright (C) 2014 Cogent Embedded, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/spinlock.h>
> +
> +/******* USB2.0 Host registers (original offset is +0x200) *******/
> +#define USB2_INT_ENABLE		0x000
> +#define USB2_USBCTR		0x00c
> +#define USB2_SPD_RSM_TIMSET	0x10c
> +#define USB2_OC_TIMSET		0x110
> +
> +/* INT_ENABLE */
> +#define USB2_INT_ENABLE_USBH_INTB_EN	BIT(2)
> +#define USB2_INT_ENABLE_USBH_INTA_EN	BIT(1)
> +#define USB2_INT_ENABLE_INIT		(USB2_INT_ENABLE_USBH_INTB_EN | \
> +					 USB2_INT_ENABLE_USBH_INTA_EN)
> +
> +/* USBCTR */
> +#define USB2_USBCTR_DIRPD	BIT(2)
> +#define USB2_USBCTR_PLL_RST	BIT(1)
> +
> +/* SPD_RSM_TIMSET */
> +#define USB2_SPD_RSM_TIMSET_INIT	0x014e029b
> +
> +/* OC_TIMSET */
> +#define USB2_OC_TIMSET_INIT		0x000209ab
> +
> +/******* HSUSB registers (original offset is +0x100) *******/
> +#define HSUSB_LPSTS			0x02
> +#define HSUSB_UGCTRL2			0x84
> +
> +/* Low Power Status register (LPSTS) */
> +#define HSUSB_LPSTS_SUSPM		0x4000
> +
> +/* USB General control register 2 (UGCTRL2) */
> +#define HSUSB_UGCTRL2_MASK		0x00000031 /* bit[31:6] should be 0 */
> +#define HSUSB_UGCTRL2_USB0SEL		0x00000030
> +#define HSUSB_UGCTRL2_USB0SEL_HOST	0x00000010
> +#define HSUSB_UGCTRL2_USB0SEL_HS_USB	0x00000020
> +#define HSUSB_UGCTRL2_USB0SEL_OTG	0x00000030
> +
> +struct rcar_gen3_phy_usb2_data {
> +	void __iomem *base;
> +	struct clk *clk;
> +};
> +
> +struct rcar_gen3_phy_usb2_channel {
> +	struct rcar_gen3_phy_usb2_data usb2;
> +	struct rcar_gen3_phy_usb2_data hsusb;
> +	struct phy *phy;
> +	spinlock_t lock;
> +};
> +
> +static int rcar_gen3_phy_usb2_init(struct phy *p)
> +{
> +	struct rcar_gen3_phy_usb2_channel *channel = phy_get_drvdata(p);
> +	unsigned long flags;
> +	void __iomem *usb2_base = channel->usb2.base;
> +	void __iomem *hsusb_base = channel->hsusb.base;
> +	u32 tmp;
> +
> +	spin_lock_irqsave(&channel->lock, flags);
> +
> +	/* Initialize USB2 part */
> +	writel(USB2_INT_ENABLE_INIT, usb2_base + USB2_INT_ENABLE);
> +	writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
> +	writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
> +
> +	/* Initialize HSUSB part */
> +	if (hsusb_base) {
> +		/* TODO: support "OTG" mode */
> +		tmp = readl(hsusb_base + HSUSB_UGCTRL2);
> +		tmp = (tmp & ~HSUSB_UGCTRL2_USB0SEL) |
> +		      HSUSB_UGCTRL2_USB0SEL_HOST;
> +		writel(tmp & HSUSB_UGCTRL2_MASK, hsusb_base + HSUSB_UGCTRL2);
> +	}
> +
> +	spin_unlock_irqrestore(&channel->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int rcar_gen3_phy_usb2_exit(struct phy *p)
> +{
> +	struct rcar_gen3_phy_usb2_channel *channel = phy_get_drvdata(p);
> +
> +	writel(0, channel->usb2.base + USB2_INT_ENABLE);
> +
> +	return 0;
> +}
> +
> +static int rcar_gen3_phy_usb2_power_on(struct phy *p)
> +{
> +	struct rcar_gen3_phy_usb2_channel *channel = phy_get_drvdata(p);
> +	void __iomem *usb2_base = channel->usb2.base;
> +	void __iomem *hsusb_base = channel->hsusb.base;
> +	unsigned long flags;
> +	u32 tmp;
> +
> +	spin_lock_irqsave(&channel->lock, flags);
> +
> +	tmp = readl(usb2_base + USB2_USBCTR);
> +	tmp |= USB2_USBCTR_PLL_RST;
> +	writel(tmp, usb2_base + USB2_USBCTR);
> +	tmp &= ~USB2_USBCTR_PLL_RST;
> +	writel(tmp, usb2_base + USB2_USBCTR);
> +
> +	/*
> +	 * TODO: To reduce power consuming, this driver should set the SUSPM
> +	 *	after the PHY detects ID pin as peripheral.
> +	 */
> +	if (hsusb_base) {
> +		/* Power on HSUSB PHY */
> +		tmp = readw(hsusb_base + HSUSB_LPSTS);
> +		tmp |= HSUSB_LPSTS_SUSPM;
> +		writew(tmp, hsusb_base + HSUSB_LPSTS);
> +	}
> +
> +	spin_unlock_irqrestore(&channel->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int rcar_gen3_phy_usb2_power_off(struct phy *p)
> +{
> +	struct rcar_gen3_phy_usb2_channel *channel = phy_get_drvdata(p);
> +	void __iomem *hsusb_base = channel->hsusb.base;
> +	unsigned long flags;
> +	u32 tmp;
> +
> +	spin_lock_irqsave(&channel->lock, flags);
> +
> +	if (hsusb_base) {
> +		/* Power off HSUSB PHY */
> +		tmp = readw(hsusb_base + HSUSB_LPSTS);
> +		tmp &= ~HSUSB_LPSTS_SUSPM;
> +		writew(tmp, hsusb_base + HSUSB_LPSTS);
> +	}
> +
> +	spin_unlock_irqrestore(&channel->lock, flags);
> +
> +	return 0;
> +}
> +
> +static struct phy_ops rcar_gen3_phy_usb2_ops = {
> +	.init		= rcar_gen3_phy_usb2_init,
> +	.exit		= rcar_gen3_phy_usb2_exit,
> +	.power_on	= rcar_gen3_phy_usb2_power_on,
> +	.power_off	= rcar_gen3_phy_usb2_power_off,
> +	.owner		= THIS_MODULE,
> +};
> +
> +static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
> +	{ .compatible = "renesas,usb2-phy-r8a7795" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);
> +
> +static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct rcar_gen3_phy_usb2_channel *channel;
> +	struct phy_provider *provider;
> +	struct resource *res;
> +
> +	if (!dev->of_node) {
> +		dev_err(dev, "This driver needs device tree\n");
> +		return -EINVAL;
> +	}
> +
> +	channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
> +	if (!channel)
> +		return -ENOMEM;
> +
> +	spin_lock_init(&channel->lock);
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "usb2");
> +	channel->usb2.base = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(channel->usb2.base))
> +		return PTR_ERR(channel->usb2.base);
> +
> +	/* "hsusb" memory resource is optional */
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hsusb");
> +
> +	/* To avoid error message by devm_ioremap_resource() */
> +	if (res) {
> +		channel->hsusb.base = devm_ioremap_resource(dev, res);
> +		if (IS_ERR(channel->hsusb.base))
> +			channel->hsusb.base = NULL;
> +	}
> +
> +	/* devm_phy_create() will call pm_runtime_enable(dev); */
> +	channel->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb2_ops);
> +	if (IS_ERR(channel->phy)) {
> +		dev_err(dev, "Failed to create USB2 PHY\n");
> +		return PTR_ERR(channel->phy);
> +	}
> +
> +	phy_set_drvdata(channel->phy, channel);
> +
> +	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +	if (IS_ERR(provider)) {
> +		dev_err(dev, "Failed to register PHY provider\n");
> +		return PTR_ERR(provider);
> +	}
> +
> +	dev_set_drvdata(dev, channel);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver rcar_gen3_phy_usb2_driver = {
> +	.driver = {
> +		.name		= "phy_rcar_gen3_usb2",
> +		.of_match_table	= rcar_gen3_phy_usb2_match_table,
> +	},
> +	.probe	= rcar_gen3_phy_usb2_probe,
> +};
> +module_platform_driver(rcar_gen3_phy_usb2_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
> +MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>");
> --
> 1.9.1

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