diff options
Diffstat (limited to 'drivers/phy/ralink/phy-ralink-usb.c')
| -rw-r--r-- | drivers/phy/ralink/phy-ralink-usb.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/drivers/phy/ralink/phy-ralink-usb.c b/drivers/phy/ralink/phy-ralink-usb.c new file mode 100644 index 000000000..2bd8ad2e7 --- /dev/null +++ b/drivers/phy/ralink/phy-ralink-usb.c @@ -0,0 +1,238 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2017 John Crispin <john@phrozen.org> + * + * Based on code from + * Allwinner Technology Co., Ltd. <www.allwinnertech.com> + */ + +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of_platform.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/reset.h> + +#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; + struct regmap *sysctl; +}; + +static void u2_phy_w32(struct ralink_usb_phy *phy, u32 val, u32 reg) +{ + writel(val, phy->base + reg); +} + +static u32 u2_phy_r32(struct ralink_usb_phy *phy, u32 reg) +{ + return readl(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); +} + +static int ralink_usb_phy_power_on(struct phy *_phy) +{ + struct ralink_usb_phy *phy = phy_get_drvdata(_phy); + u32 t; + + /* enable the phy */ + regmap_update_bits(phy->sysctl, RT_SYSC_REG_CLKCFG1, + phy->clk, phy->clk); + + /* setup host mode */ + regmap_update_bits(phy->sysctl, RT_SYSC_REG_SYSCFG1, + RT_SYSCFG1_USB0_HOST_MODE, + RT_SYSCFG1_USB0_HOST_MODE); + + /* 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 */ + regmap_read(phy->sysctl, RT_SYSC_REG_USB_PHY_CFG, &t); + 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 */ + regmap_update_bits(phy->sysctl, RT_SYSC_REG_CLKCFG1, + phy->clk, 0); + + /* assert the reset lines */ + reset_control_assert(phy->rstdev); + reset_control_assert(phy->rsthost); + + return 0; +} + +static const 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 *)(uintptr_t)(RT_CLKCFG1_UPHY1_CLK_EN | + RT_CLKCFG1_UPHY0_CLK_EN) + }, + { + .compatible = "mediatek,mt7620-usbphy", + .data = (void *)(uintptr_t)(MT7620_CLKCFG1_UPHY1_CLK_EN | + MT7620_CLKCFG1_UPHY0_CLK_EN) + }, + { + .compatible = "mediatek,mt7628-usbphy", + .data = (void *)(uintptr_t)(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 phy_provider *phy_provider; + const struct of_device_id *match; + struct ralink_usb_phy *phy; + + match = of_match_device(ralink_usb_phy_of_match, &pdev->dev); + if (!match) + return -ENODEV; + + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENOMEM; + + phy->clk = (uintptr_t)match->data; + phy->base = NULL; + + phy->sysctl = syscon_regmap_lookup_by_phandle(dev->of_node, "ralink,sysctl"); + if (IS_ERR(phy->sysctl)) { + dev_err(dev, "failed to get sysctl registers\n"); + return PTR_ERR(phy->sysctl); + } + + /* The MT7628 and MT7688 require extra setup of PHY registers. */ + if (of_device_is_compatible(dev->of_node, "mediatek,mt7628-usbphy")) { + phy->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(phy->base)) { + dev_err(dev, "failed to remap register memory\n"); + return PTR_ERR(phy->base); + } + } + + phy->rsthost = devm_reset_control_get(&pdev->dev, "host"); + if (IS_ERR(phy->rsthost)) { + dev_err(dev, "host reset is missing\n"); + return PTR_ERR(phy->rsthost); + } + + phy->rstdev = devm_reset_control_get(&pdev->dev, "device"); + if (IS_ERR(phy->rstdev)) { + dev_err(dev, "device reset is missing\n"); + return PTR_ERR(phy->rstdev); + } + + phy->phy = devm_phy_create(dev, NULL, &ralink_usb_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 struct platform_driver ralink_usb_phy_driver = { + .probe = ralink_usb_phy_probe, + .driver = { + .of_match_table = ralink_usb_phy_of_match, + .name = "ralink-usb-phy", + } +}; +module_platform_driver(ralink_usb_phy_driver); + +MODULE_DESCRIPTION("Ralink USB phy driver"); +MODULE_AUTHOR("John Crispin <john@phrozen.org>"); +MODULE_LICENSE("GPL v2"); |