diff options
Diffstat (limited to 'drivers/phy/mt76x8-usb-phy.c')
| -rw-r--r-- | drivers/phy/mt76x8-usb-phy.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/drivers/phy/mt76x8-usb-phy.c b/drivers/phy/mt76x8-usb-phy.c new file mode 100644 index 0000000000..268da8ef6c --- /dev/null +++ b/drivers/phy/mt76x8-usb-phy.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Stefan Roese <sr@denx.de> + * + * Derived from linux/drivers/phy/ralink/phy-ralink-usb.c + * Copyright (C) 2017 John Crispin <john@phrozen.org> + */ + +#include <common.h> +#include <dm.h> +#include <generic-phy.h> +#include <regmap.h> +#include <reset-uclass.h> +#include <syscon.h> +#include <asm/io.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 mt76x8_usb_phy { + u32 clk; + void __iomem *base; + struct regmap *sysctl; +}; + +static void u2_phy_w32(struct mt76x8_usb_phy *phy, u32 val, u32 reg) +{ + writel(val, phy->base + reg); +} + +static u32 u2_phy_r32(struct mt76x8_usb_phy *phy, u32 reg) +{ + return readl(phy->base + reg); +} + +static void mt76x8_usb_phy_init(struct mt76x8_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 mt76x8_usb_phy_power_on(struct phy *_phy) +{ + struct mt76x8_usb_phy *phy = dev_get_priv(_phy->dev); + 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); + + /* + * The SDK kernel had a delay of 100ms. however on device + * testing showed that 10ms is enough + */ + mdelay(10); + + if (phy->base) + mt76x8_usb_phy_init(phy); + + /* print some status info */ + regmap_read(phy->sysctl, RT_SYSC_REG_USB_PHY_CFG, &t); + printf("remote usb device wakeup %s\n", + (t & UDEV_WAKEUP) ? "enabled" : "disabled"); + if (t & USB_PHY_UTMI_8B60M) + printf("UTMI 8bit 60MHz\n"); + else + printf("UTMI 16bit 30MHz\n"); + + return 0; +} + +static int mt76x8_usb_phy_power_off(struct phy *_phy) +{ + struct mt76x8_usb_phy *phy = dev_get_priv(_phy->dev); + + /* disable the phy */ + regmap_update_bits(phy->sysctl, RT_SYSC_REG_CLKCFG1, + phy->clk, 0); + + return 0; +} + +static int mt76x8_usb_phy_probe(struct udevice *dev) +{ + struct mt76x8_usb_phy *phy = dev_get_priv(dev); + + phy->sysctl = syscon_regmap_lookup_by_phandle(dev, "ralink,sysctl"); + if (IS_ERR(phy->sysctl)) + return PTR_ERR(phy->sysctl); + + phy->base = dev_read_addr_ptr(dev); + if (!phy->base) + return -EINVAL; + + return 0; +} + +static struct phy_ops mt76x8_usb_phy_ops = { + .power_on = mt76x8_usb_phy_power_on, + .power_off = mt76x8_usb_phy_power_off, +}; + +static const struct udevice_id mt76x8_usb_phy_ids[] = { + { .compatible = "mediatek,mt7628-usbphy" }, + { } +}; + +U_BOOT_DRIVER(mt76x8_usb_phy) = { + .name = "mt76x8_usb_phy", + .id = UCLASS_PHY, + .of_match = mt76x8_usb_phy_ids, + .ops = &mt76x8_usb_phy_ops, + .probe = mt76x8_usb_phy_probe, + .priv_auto_alloc_size = sizeof(struct mt76x8_usb_phy), +}; |