Hi,
On Tuesday 15 August 2017 06:17 PM, Harvey Hunt wrote:
> From: John Crispin <j...@phrozen.org>
>
> Add a driver to setup the USB phy on Mediatek/Ralink SoCs.
> The driver sets up power and host mode, but also needs to
> configure PHY registers for the MT7628 and MT7688.
>
> Signed-off-by: John Crispin <j...@phrozen.org>
> Signed-off-by: Harvey Hunt <harvey.h...@imgtec.com>
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-media...@lists.infradead.org
> ---
> Changes in V6
> * Add binding for MT7628
> * Configure PHY registers for MT76{2,8}8
>
> Changes in V5
> * Depend on MIPS
>
> Changes in V4
> * Remove Allwinner from comment
> * Depend on COMPILE_TEST
>
> Changes in V3
> * Separate DT bindings
> * Update Kconfig text
> * Modify John's email address
> * Rebase onto v4.13-rc3
>
> Changes in V2
> * remove refcounting
> * drop empty functions
> * dont use static globals
> * use explicit compatible strings
>
> drivers/phy/Kconfig | 9 ++
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-ralink-usb.c | 238
> +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 248 insertions(+)
> create mode 100644 drivers/phy/phy-ralink-usb.c
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index c1807d4..a95394b 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -41,6 +41,15 @@ config PHY_PISTACHIO_USB
> help
> Enable this to support the USB2.0 PHY on the IMG Pistachio SoC.
>
> +config PHY_RALINK_USB
> + tristate "Ralink USB PHY driver"
> + depends on RALINK || COMPILE_TEST
> + depends on MIPS
depends on (RALINK && MIPS) || COMPILE_TEST ??
> + select GENERIC_PHY
> + help
> + This option enables support for the Ralink USB PHY found inside
> + RT3352, MT7620, MT7628 and MT7688.
> +
> config PHY_XGENE
> tristate "APM X-Gene 15Gbps PHY support"
> depends on HAS_IOMEM && OF && (ARM64 || COMPILE_TEST)
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index f252201..60ed30b 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -7,6 +7,7 @@ obj-$(CONFIG_PHY_LPC18XX_USB_OTG) += phy-lpc18xx-usb-otg.o
> obj-$(CONFIG_PHY_MT65XX_USB3) += phy-mt65xx-usb3.o
> obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
> obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o
> +obj-$(CONFIG_PHY_RALINK_USB) += phy-ralink-usb.o
>
> obj-$(CONFIG_ARCH_SUNXI) += allwinner/
> obj-$(CONFIG_ARCH_MESON) += amlogic/
> diff --git a/drivers/phy/phy-ralink-usb.c b/drivers/phy/phy-ralink-usb.c
> new file mode 100644
> index 0000000..d027c43
> --- /dev/null
> +++ b/drivers/phy/phy-ralink-usb.c
We have separate directories for every vendor. Care to add a new directory for
ralink?
> @@ -0,0 +1,238 @@
> +/*
> + * Copyright (C) 2016 John Crispin <j...@phrozen.org>
2017
> + *
> + * Based on code from
> + * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +#include <linux/of_platform.h>
> +
> +#include <asm/mach-ralink/ralink_regs.h>
Er.. I think we can't add COMPILE_TEST with this. Why do you have to include
arch specific headers?
> +
> +#define RT_SYSC_REG_SYSCFG1 0x014
> +#define RT_SYSC_REG_CLKCFG1 0x030
> +#define RT_SYSC_REG_USB_PHY_CFG 0x05c
> +
> +#define OFS_U2_PHY_AC0 0x800
> +#define OFS_U2_PHY_AC1 0x804
> +#define OFS_U2_PHY_AC2 0x808
> +#define OFS_U2_PHY_ACR0 0x810
> +#define OFS_U2_PHY_ACR1 0x814
> +#define OFS_U2_PHY_ACR2 0x818
> +#define OFS_U2_PHY_ACR3 0x81C
> +#define OFS_U2_PHY_ACR4 0x820
> +#define OFS_U2_PHY_AMON0 0x824
> +#define OFS_U2_PHY_DCR0 0x860
> +#define OFS_U2_PHY_DCR1 0x864
> +#define OFS_U2_PHY_DTM0 0x868
> +#define OFS_U2_PHY_DTM1 0x86C
> +
> +#define RT_RSTCTRL_UDEV BIT(25)
> +#define RT_RSTCTRL_UHST BIT(22)
> +#define RT_SYSCFG1_USB0_HOST_MODE BIT(10)
> +
> +#define MT7620_CLKCFG1_UPHY0_CLK_EN BIT(25)
> +#define MT7620_CLKCFG1_UPHY1_CLK_EN BIT(22)
> +#define RT_CLKCFG1_UPHY1_CLK_EN BIT(20)
> +#define RT_CLKCFG1_UPHY0_CLK_EN BIT(18)
> +
> +#define USB_PHY_UTMI_8B60M BIT(1)
> +#define UDEV_WAKEUP BIT(0)
> +
> +struct ralink_usb_phy {
> + struct reset_control *rstdev;
> + struct reset_control *rsthost;
> + u32 clk;
> + struct phy *phy;
> + void __iomem *base;
> +};
> +
> +static void u2_phy_w32(struct ralink_usb_phy *phy, u32 val, u32 reg)
> +{
> + iowrite32(val, phy->base + reg);
> +}
Why iowrite?
> +
> +static u32 u2_phy_r32(struct ralink_usb_phy *phy, u32 reg)
> +{
> + return ioread32(phy->base + reg);
> +}
> +
> +static void ralink_usb_phy_init(struct ralink_usb_phy *phy)
> +{
> + u2_phy_r32(phy, OFS_U2_PHY_AC2);
> + u2_phy_r32(phy, OFS_U2_PHY_ACR0);
> + u2_phy_r32(phy, OFS_U2_PHY_DCR0);
> +
> + u2_phy_w32(phy, 0x00ffff02, OFS_U2_PHY_DCR0);
> + u2_phy_r32(phy, OFS_U2_PHY_DCR0);
> + u2_phy_w32(phy, 0x00555502, OFS_U2_PHY_DCR0);
> + u2_phy_r32(phy, OFS_U2_PHY_DCR0);
> + u2_phy_w32(phy, 0x00aaaa02, OFS_U2_PHY_DCR0);
> + u2_phy_r32(phy, OFS_U2_PHY_DCR0);
> + u2_phy_w32(phy, 0x00000402, OFS_U2_PHY_DCR0);
> + u2_phy_r32(phy, OFS_U2_PHY_DCR0);
> + u2_phy_w32(phy, 0x0048086a, OFS_U2_PHY_AC0);
> + u2_phy_w32(phy, 0x4400001c, OFS_U2_PHY_AC1);
> + u2_phy_w32(phy, 0xc0200000, OFS_U2_PHY_ACR3);
> + u2_phy_w32(phy, 0x02000000, OFS_U2_PHY_DTM0);
That's too many magic values. But I guess I'm getting used to such
configurations in PHY drivers.
> +}
> +
> +static int ralink_usb_phy_power_on(struct phy *_phy)
> +{
> + struct ralink_usb_phy *phy = phy_get_drvdata(_phy);
> + u32 t;
> +
> + /* enable the phy */
> + rt_sysc_m32(0, phy->clk, RT_SYSC_REG_CLKCFG1);
> +
> + /* setup host mode */
> + rt_sysc_m32(0, RT_SYSCFG1_USB0_HOST_MODE, RT_SYSC_REG_SYSCFG1);
Instead of such arch-specific functions, why not use regmap API's?
> +
> + /* deassert the reset lines */
> + reset_control_deassert(phy->rsthost);
> + reset_control_deassert(phy->rstdev);
> +
> + /*
> + * The SDK kernel had a delay of 100ms. however on device
> + * testing showed that 10ms is enough
> + */
> + mdelay(10);
> +
> + if (phy->base)
> + ralink_usb_phy_init(phy);
> +
> + /* print some status info */
> + t = rt_sysc_r32(RT_SYSC_REG_USB_PHY_CFG);
> + dev_info(&phy->phy->dev, "remote usb device wakeup %s\n",
> + (t & UDEV_WAKEUP) ? ("enabled") : ("disabled"));
> + if (t & USB_PHY_UTMI_8B60M)
> + dev_info(&phy->phy->dev, "UTMI 8bit 60MHz\n");
> + else
> + dev_info(&phy->phy->dev, "UTMI 16bit 30MHz\n");
> +
> + return 0;
> +}
> +
> +static int ralink_usb_phy_power_off(struct phy *_phy)
> +{
> + struct ralink_usb_phy *phy = phy_get_drvdata(_phy);
> +
> + /* disable the phy */
> + rt_sysc_m32(phy->clk, 0, RT_SYSC_REG_CLKCFG1);
> +
> + /* assert the reset lines */
> + reset_control_assert(phy->rstdev);
> + reset_control_assert(phy->rsthost);
> +
> + return 0;
> +}
> +
> +static struct phy_ops ralink_usb_phy_ops = {
> + .power_on = ralink_usb_phy_power_on,
> + .power_off = ralink_usb_phy_power_off,
> + .owner = THIS_MODULE,
> +};
> +
> +static const struct of_device_id ralink_usb_phy_of_match[] = {
> + {
> + .compatible = "ralink,rt3352-usbphy",
> + .data = (void *) (RT_CLKCFG1_UPHY1_CLK_EN |
> + RT_CLKCFG1_UPHY0_CLK_EN)
> + },
> + {
> + .compatible = "mediatek,mt7620-usbphy",
> + .data = (void *) (MT7620_CLKCFG1_UPHY1_CLK_EN |
> + MT7620_CLKCFG1_UPHY0_CLK_EN)
> + },
> + {
> + .compatible = "mediatek,mt7628-usbphy",
> + .data = (void *) (MT7620_CLKCFG1_UPHY1_CLK_EN |
> + MT7620_CLKCFG1_UPHY0_CLK_EN) },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, ralink_usb_phy_of_match);
> +
> +static int ralink_usb_phy_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + struct phy_provider *phy_provider;
> + const struct of_device_id *match;
> + struct ralink_usb_phy *phy;
> +
> + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> + if (!phy)
> + return -ENOMEM;
> +
> + match = of_match_device(ralink_usb_phy_of_match, &pdev->dev);
> + if (!match)
> + return -ENODEV;
It's usual to have of_match_device before anything else in probe.
Thanks
Kishon
