[PATCH 2/2] phy: Add Qualcomm QUSB2 USB PHY driver

Several Qualcomm SoCs support QUSB2 USB PHY (for e.g. SM6115 and SDM845 - the corresponding boards being QRB4210-RB2 and Dragonboard845c-RB3).

Add PHY driver for the same.

Using this driver, the USB Hub connected on board on RB2, can be successfully enumerated via '> usb start'.

Signed-off-by: Bhupesh Sharma bhupesh.sharma@linaro.org --- drivers/phy/qcom/Kconfig | 7 + drivers/phy/qcom/Makefile | 1 + drivers/phy/qcom/phy-qcom-qusb2.c | 423 ++++++++++++++++++++++++++++++ 3 files changed, 431 insertions(+) create mode 100644 drivers/phy/qcom/phy-qcom-qusb2.c

diff --git a/drivers/phy/qcom/Kconfig b/drivers/phy/qcom/Kconfig index f4ca174805..361dfb6e11 100644 --- a/drivers/phy/qcom/Kconfig +++ b/drivers/phy/qcom/Kconfig @@ -12,6 +12,13 @@ config PHY_QCOM_IPQ4019_USB help Support for the USB PHY-s on Qualcomm IPQ40xx SoC-s.

+config PHY_QCOM_QUSB2 + tristate "Qualcomm USB QUSB2 PHY driver" + depends on PHY && ARCH_SNAPDRAGON + help + Enable this to support the Super-Speed USB transceiver on various + Qualcomm chipsets. + config PHY_QCOM_USB_HS_28NM tristate "Qualcomm 28nm High-Speed PHY" depends on PHY && ARCH_SNAPDRAGON diff --git a/drivers/phy/qcom/Makefile b/drivers/phy/qcom/Makefile index 2113f178c0..f6af985666 100644 --- a/drivers/phy/qcom/Makefile +++ b/drivers/phy/qcom/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_PHY_QCOM_IPQ4019_USB) += phy-qcom-ipq4019-usb.o obj-$(CONFIG_MSM8916_USB_PHY) += msm8916-usbh-phy.o +obj-$(CONFIG_PHY_QCOM_QUSB2) += phy-qcom-qusb2.o obj-$(CONFIG_PHY_QCOM_USB_HS_28NM) += phy-qcom-usb-hs-28nm.o obj-$(CONFIG_PHY_QCOM_USB_SS) += phy-qcom-usb-ss.o diff --git a/drivers/phy/qcom/phy-qcom-qusb2.c b/drivers/phy/qcom/phy-qcom-qusb2.c new file mode 100644 index 0000000000..eab02ed652 --- /dev/null +++ b/drivers/phy/qcom/phy-qcom-qusb2.c @@ -0,0 +1,423 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2023 Bhupesh Sharma bhupesh.sharma@linaro.org + * + * Based on Linux driver + */ + +#include <common.h> +#include <dm.h> +#include <generic-phy.h> +#include <linux/bitops.h> +#include <asm/io.h> +#include <reset.h> +#include <clk.h> +#include <linux/delay.h> + +#include <dt-bindings/phy/phy-qcom-qusb2.h> + +#define QUSB2PHY_PLL 0x0 +#define QUSB2PHY_PLL_TEST 0x04 +#define CLK_REF_SEL BIT(7) + +#define QUSB2PHY_PLL_TUNE 0x08 +#define QUSB2PHY_PLL_USER_CTL1 0x0c +#define QUSB2PHY_PLL_USER_CTL2 0x10 +#define QUSB2PHY_PLL_AUTOPGM_CTL1 0x1c +#define QUSB2PHY_PLL_PWR_CTRL 0x18 + +/* QUSB2PHY_PLL_STATUS register bits */ +#define PLL_LOCKED BIT(5) + +/* QUSB2PHY_PLL_COMMON_STATUS_ONE register bits */ +#define CORE_READY_STATUS BIT(0) + +/* QUSB2PHY_PORT_POWERDOWN register bits */ +#define CLAMP_N_EN BIT(5) +#define FREEZIO_N BIT(1) +#define POWER_DOWN BIT(0) + +/* QUSB2PHY_PWR_CTRL1 register bits */ +#define PWR_CTRL1_VREF_SUPPLY_TRIM BIT(5) +#define PWR_CTRL1_CLAMP_N_EN BIT(1) + +#define QUSB2PHY_REFCLK_ENABLE BIT(0) + +#define PHY_CLK_SCHEME_SEL BIT(0) + +/* QUSB2PHY_INTR_CTRL register bits */ +#define DMSE_INTR_HIGH_SEL BIT(4) +#define DPSE_INTR_HIGH_SEL BIT(3) +#define CHG_DET_INTR_EN BIT(2) +#define DMSE_INTR_EN BIT(1) +#define DPSE_INTR_EN BIT(0) + +/* QUSB2PHY_PLL_CORE_INPUT_OVERRIDE register bits */ +#define CORE_PLL_EN_FROM_RESET BIT(4) +#define CORE_RESET BIT(5) +#define CORE_RESET_MUX BIT(6) + +/* QUSB2PHY_IMP_CTRL1 register bits */ +#define IMP_RES_OFFSET_MASK GENMASK(5, 0) +#define IMP_RES_OFFSET_SHIFT 0x0 + +/* QUSB2PHY_PLL_BIAS_CONTROL_2 register bits */ +#define BIAS_CTRL2_RES_OFFSET_MASK GENMASK(5, 0) +#define BIAS_CTRL2_RES_OFFSET_SHIFT 0x0 + +/* QUSB2PHY_CHG_CONTROL_2 register bits */ +#define CHG_CTRL2_OFFSET_MASK GENMASK(5, 4) +#define CHG_CTRL2_OFFSET_SHIFT 0x4 + +/* QUSB2PHY_PORT_TUNE1 register bits */ +#define HSTX_TRIM_MASK GENMASK(7, 4) +#define HSTX_TRIM_SHIFT 0x4 +#define PREEMPH_WIDTH_HALF_BIT BIT(2) +#define PREEMPHASIS_EN_MASK GENMASK(1, 0) +#define PREEMPHASIS_EN_SHIFT 0x0 + +/* QUSB2PHY_PORT_TUNE2 register bits */ +#define HSDISC_TRIM_MASK GENMASK(1, 0) +#define HSDISC_TRIM_SHIFT 0x0 + +#define QUSB2PHY_PLL_ANALOG_CONTROLS_TWO 0x04 +#define QUSB2PHY_PLL_CLOCK_INVERTERS 0x18c +#define QUSB2PHY_PLL_CMODE 0x2c +#define QUSB2PHY_PLL_LOCK_DELAY 0x184 +#define QUSB2PHY_PLL_DIGITAL_TIMERS_TWO 0xb4 +#define QUSB2PHY_PLL_BIAS_CONTROL_1 0x194 +#define QUSB2PHY_PLL_BIAS_CONTROL_2 0x198 +#define QUSB2PHY_PWR_CTRL2 0x214 +#define QUSB2PHY_IMP_CTRL1 0x220 +#define QUSB2PHY_IMP_CTRL2 0x224 +#define QUSB2PHY_CHG_CTRL2 0x23c + +struct qusb2_phy_init_tbl { + unsigned int offset; + unsigned int val; + /* + * register part of layout ? + * if yes, then offset gives index in the reg-layout + */ + int in_layout; +}; + +struct qusb2_phy_cfg { + const struct qusb2_phy_init_tbl *tbl; + /* number of entries in the table */ + unsigned int tbl_num; + /* offset to PHY_CLK_SCHEME register in TCSR map */ + unsigned int clk_scheme_offset; + + /* array of registers with different offsets */ + const unsigned int *regs; + unsigned int mask_core_ready; + unsigned int disable_ctrl; + unsigned int autoresume_en; + + /* true if PHY has PLL_TEST register to select clk_scheme */ + bool has_pll_test; + + /* true if TUNE1 register must be updated by fused value, else TUNE2 */ + bool update_tune1_with_efuse; + + /* true if PHY has PLL_CORE_INPUT_OVERRIDE register to reset PLL */ + bool has_pll_override; +}; + +/* set of registers with offsets different per-PHY */ +enum qusb2phy_reg_layout { + QUSB2PHY_PLL_CORE_INPUT_OVERRIDE, + QUSB2PHY_PLL_STATUS, + QUSB2PHY_PORT_TUNE1, + QUSB2PHY_PORT_TUNE2, + QUSB2PHY_PORT_TUNE3, + QUSB2PHY_PORT_TUNE4, + QUSB2PHY_PORT_TUNE5, + QUSB2PHY_PORT_TEST1, + QUSB2PHY_PORT_TEST2, + QUSB2PHY_PORT_POWERDOWN, + QUSB2PHY_INTR_CTRL, +}; + +#define QUSB2_PHY_INIT_CFG(o, v) \ + { \ + .offset = o, \ + .val = v, \ + } + +#define QUSB2_PHY_INIT_CFG_L(o, v) \ + { \ + .offset = o, \ + .val = v, \ + .in_layout = 1, \ + } + +static const struct qusb2_phy_init_tbl sm6115_init_tbl[] = { + QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE1, 0xf8), + QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE2, 0x53), + QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE3, 0x81), + QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE4, 0x17), + + QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_TUNE, 0x30), + QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_USER_CTL1, 0x79), + QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_USER_CTL2, 0x21), + + QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TEST2, 0x14), + + QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_AUTOPGM_CTL1, 0x9f), + QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_PWR_CTRL, 0x00), +}; + +static const unsigned int sm6115_regs_layout[] = { + [QUSB2PHY_PLL_STATUS] = 0x38, + [QUSB2PHY_PORT_TUNE1] = 0x80, + [QUSB2PHY_PORT_TUNE2] = 0x84, + [QUSB2PHY_PORT_TUNE3] = 0x88, + [QUSB2PHY_PORT_TUNE4] = 0x8c, + [QUSB2PHY_PORT_TUNE5] = 0x90, + [QUSB2PHY_PORT_TEST1] = 0xb8, + [QUSB2PHY_PORT_TEST2] = 0x9c, + [QUSB2PHY_PORT_POWERDOWN] = 0xb4, + [QUSB2PHY_INTR_CTRL] = 0xbc, +}; + +static const struct qusb2_phy_cfg sm6115_phy_cfg = { + .tbl = sm6115_init_tbl, + .tbl_num = ARRAY_SIZE(sm6115_init_tbl), + .regs = sm6115_regs_layout, + + .has_pll_test = true, + .disable_ctrl = (CLAMP_N_EN | FREEZIO_N | POWER_DOWN), + .mask_core_ready = PLL_LOCKED, + .autoresume_en = BIT(3), +}; + +/** + * struct qusb2_phy - structure holding qusb2 phy attributes + * + * @phy: generic phy + * @base: iomapped memory space for qubs2 phy + * + * @cfg_ahb_clk: AHB2PHY interface clock + * @ref_clk: phy reference clock + * @iface_clk: phy interface clock + * @phy_rst: phy reset control + * + * @cfg: phy config data + * @has_se_clk_scheme: indicate if PHY has single-ended ref clock scheme + */ +struct qusb2_phy { + struct phy *phy; + void __iomem *base; + + struct clk *cfg_ahb_clk; + struct clk *ref_clk; + struct clk *iface_clk; + struct clk_bulk clks; + struct reset_ctl phy_rst; + + const struct qusb2_phy_cfg *cfg; + bool has_se_clk_scheme; +}; + +static inline void qusb2_write_mask(void __iomem *base, u32 offset, + u32 val, u32 mask) +{ + u32 reg; + + reg = readl(base + offset); + reg &= ~mask; + reg |= val & mask; + writel(reg, base + offset); + + /* Ensure above write is completed */ + readl(base + offset); +} + +static inline void qusb2_setbits(void __iomem *base, u32 offset, u32 val) +{ + u32 reg; + + reg = readl(base + offset); + reg |= val; + writel(reg, base + offset); + + /* Ensure above write is completed */ + readl(base + offset); +} + +static inline void qusb2_clrbits(void __iomem *base, u32 offset, u32 val) +{ + u32 reg; + + reg = readl(base + offset); + reg &= ~val; + writel(reg, base + offset); + + /* Ensure above write is completed */ + readl(base + offset); +} + +static inline +void qusb2_phy_configure(void __iomem *base, + const unsigned int *regs, + const struct qusb2_phy_init_tbl tbl[], int num) +{ + int i; + + for (i = 0; i < num; i++) { + if (tbl[i].in_layout) + writel(tbl[i].val, base + regs[tbl[i].offset]); + else + writel(tbl[i].val, base + tbl[i].offset); + } +} + +static int qusb2phy_do_reset(struct qusb2_phy *qphy) +{ + int ret; + + ret = reset_assert(&qphy->phy_rst); + if (ret) + return ret; + + udelay(10); + + ret = reset_deassert(&qphy->phy_rst); + if (ret) + return ret; + + return 0; +} + +static int qusb2phy_power_on(struct phy *phy) +{ + struct qusb2_phy *qphy = dev_get_priv(phy->dev); + const struct qusb2_phy_cfg *cfg = qphy->cfg; + int ret; + u32 val; + + ret = qusb2phy_do_reset(qphy); + if (ret) + return ret; + + /* Disable the PHY */ + qusb2_setbits(qphy->base, cfg->regs[QUSB2PHY_PORT_POWERDOWN], + qphy->cfg->disable_ctrl); + + if (cfg->has_pll_test) { + /* save reset value to override reference clock scheme later */ + val = readl(qphy->base + QUSB2PHY_PLL_TEST); + } + + qusb2_phy_configure(qphy->base, cfg->regs, cfg->tbl, + cfg->tbl_num); + + /* Enable the PHY */ + qusb2_clrbits(qphy->base, cfg->regs[QUSB2PHY_PORT_POWERDOWN], + POWER_DOWN); + + /* Required to get phy pll lock successfully */ + udelay(150); + + if (cfg->has_pll_test) { + val |= CLK_REF_SEL; + + writel(val, qphy->base + QUSB2PHY_PLL_TEST); + + /* ensure above write is through */ + readl(qphy->base + QUSB2PHY_PLL_TEST); + } + + /* Required to get phy pll lock successfully */ + udelay(100); + + val = readb(qphy->base + cfg->regs[QUSB2PHY_PLL_STATUS]); + if (!(val & cfg->mask_core_ready)) { + pr_err("QUSB2PHY pll lock failed: status reg = %x\n", val); + ret = -EBUSY; + return ret; + } + + return 0; +} + +static int qusb2phy_power_off(struct phy *phy) +{ + struct qusb2_phy *qphy = dev_get_priv(phy->dev); + + /* Disable the PHY */ + qusb2_setbits(qphy->base, qphy->cfg->regs[QUSB2PHY_PORT_POWERDOWN], + qphy->cfg->disable_ctrl); + + reset_assert(&qphy->phy_rst); + + clk_disable_bulk(&qphy->clks); + clk_release_bulk(&qphy->clks); + + return 0; +} + +static int qusb2phy_clk_init(struct udevice *dev, struct qusb2_phy *qphy) +{ + int ret; + + ret = clk_get_bulk(dev, &qphy->clks); + if (ret == -ENOSYS || ret == -ENOENT) + return 0; + if (ret) + return ret; + + ret = clk_enable_bulk(&qphy->clks); + if (ret) { + clk_release_bulk(&qphy->clks); + return ret; + } + + return 0; +} + +static int qusb2phy_probe(struct udevice *dev) +{ + struct qusb2_phy *qphy = dev_get_priv(dev); + int ret; + + qphy->base = (void __iomem *)dev_read_addr(dev); + if (IS_ERR(qphy->base)) + return PTR_ERR(qphy->base); + + ret = qusb2phy_clk_init(dev, qphy); + if (ret) + return ret; + + ret = reset_get_by_name(dev, "phy", &qphy->phy_rst); + if (ret) + return ret; + + qphy->cfg = (const struct qusb2_phy_cfg *)dev_get_driver_data(dev); + if (!qphy->cfg) + return -EINVAL; + + return 0; +} + +static struct phy_ops qusb2phy_ops = { + .power_on = qusb2phy_power_on, + .power_off = qusb2phy_power_off, +}; + +static const struct udevice_id qusb2phy_ids[] = { + { .compatible = "qcom,qusb2-phy" }, + { .compatible = "qcom,sm6115-qusb2-phy", .data = (ulong)&sm6115_phy_cfg }, + { } +}; + +U_BOOT_DRIVER(qcom_qusb2_phy) = { + .name = "qcom-qusb2-phy", + .id = UCLASS_PHY, + .of_match = qusb2phy_ids, + .ops = &qusb2phy_ops, + .probe = qusb2phy_probe, + .priv_auto = sizeof(struct qusb2_phy), +};