Re: [PATCH 09/10] phy: qualcomm: Add QCOM SNPS eUSB2 driver

From: Vinod Koul
Date: Thu Nov 24 2022 - 13:01:48 EST

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On 16-11-22, 14:01, Abel Vesa wrote:
> The SM8550 SoC uses Synopsis eUSB2 PHY for USB 2.0.
> Add a new driver for it.
>
> The driver is based on a downstream implementation.
>
> Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
> ---
> drivers/phy/qualcomm/Kconfig | 9 +
> drivers/phy/qualcomm/Makefile | 1 +
> drivers/phy/qualcomm/phy-qcom-snps-eusb2.c | 428 +++++++++++++++++++++
> 3 files changed, 438 insertions(+)
> create mode 100644 drivers/phy/qualcomm/phy-qcom-snps-eusb2.c
>
> diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
> index eb9ddc685b38..27b5a2a3637d 100644
> --- a/drivers/phy/qualcomm/Kconfig
> +++ b/drivers/phy/qualcomm/Kconfig
> @@ -70,6 +70,15 @@ config PHY_QCOM_QUSB2
> PHY which is usually paired with either the ChipIdea or Synopsys DWC3
> USB IPs on MSM SOCs.
>
> +config PHY_QCOM_SNPS_EUSB2
> + tristate "Qualcomm SNPS eUSB2 PHY Driver"
> + depends on OF && (ARCH_QCOM || COMPILE_TEST)
> + select GENERIC_PHY
> + help
> + Enable support for the USB high-speed SNPS eUSB2 phy on Qualcomm
> + chipsets. The PHY is paired with a Synopsys DWC3 USB controller
> + on Qualcomm SOCs.
> +
> config PHY_QCOM_USB_HS
> tristate "Qualcomm USB HS PHY module"
> depends on USB_ULPI_BUS
> diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile
> index 65f6c30a3e93..3ee118f4dfc7 100644
> --- a/drivers/phy/qualcomm/Makefile
> +++ b/drivers/phy/qualcomm/Makefile
> @@ -13,6 +13,7 @@ obj-$(CONFIG_PHY_QCOM_QMP) += \
> phy-qcom-qmp-usb.o
>
> obj-$(CONFIG_PHY_QCOM_QUSB2) += phy-qcom-qusb2.o
> +obj-$(CONFIG_PHY_QCOM_SNPS_EUSB2) += phy-qcom-snps-eusb2.o
> obj-$(CONFIG_PHY_QCOM_USB_HS) += phy-qcom-usb-hs.o
> obj-$(CONFIG_PHY_QCOM_USB_HSIC) += phy-qcom-usb-hsic.o
> obj-$(CONFIG_PHY_QCOM_USB_HS_28NM) += phy-qcom-usb-hs-28nm.o
> diff --git a/drivers/phy/qualcomm/phy-qcom-snps-eusb2.c b/drivers/phy/qualcomm/phy-qcom-snps-eusb2.c
> new file mode 100644
> index 000000000000..1bb42ec14703
> --- /dev/null
> +++ b/drivers/phy/qualcomm/phy-qcom-snps-eusb2.c
> @@ -0,0 +1,428 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
> + * Copyright (c) 2022, Linaro Limited
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/reset.h>
> +#include <linux/slab.h>

do you really need all of these?

> +
> +#define USB_PHY_UTMI_CTRL0 (0x3c)
> +#define SLEEPM BIT(0)
> +#define OPMODE_MASK GENMASK(4, 3)
> +#define OPMODE_NONDRIVING BIT(3)
> +
> +#define USB_PHY_UTMI_CTRL5 (0x50)
> +#define POR BIT(1)
> +
> +#define USB_PHY_HS_PHY_CTRL_COMMON0 (0x54)
> +#define PHY_ENABLE BIT(0)
> +#define SIDDQ_SEL BIT(1)
> +#define SIDDQ BIT(2)
> +#define RETENABLEN BIT(3)
> +#define FSEL_MASK GENMASK(6, 4)
> +#define FSEL_19_2_MHZ_VAL (0x0)
> +#define FSEL_38_4_MHZ_VAL (0x4)
> +
> +#define USB_PHY_CFG_CTRL_1 (0x58)
> +#define PHY_CFG_PLL_CPBIAS_CNTRL_MASK GENMASK(7, 1)
> +
> +#define USB_PHY_CFG_CTRL_2 (0x5c)
> +#define PHY_CFG_PLL_FB_DIV_7_0_MASK GENMASK(7, 0)
> +#define DIV_7_0_19_2_MHZ_VAL (0x90)
> +#define DIV_7_0_38_4_MHZ_VAL (0xc8)
> +
> +#define USB_PHY_CFG_CTRL_3 (0x60)
> +#define PHY_CFG_PLL_FB_DIV_11_8_MASK GENMASK(3, 0)
> +#define DIV_11_8_19_2_MHZ_VAL (0x1)
> +#define DIV_11_8_38_4_MHZ_VAL (0x0)
> +
> +#define PHY_CFG_PLL_REF_DIV GENMASK(7, 4)
> +#define PLL_REF_DIV_VAL (0x0)
> +
> +#define USB_PHY_HS_PHY_CTRL2 (0x64)
> +#define VBUSVLDEXT0 BIT(0)
> +#define USB2_SUSPEND_N BIT(2)
> +#define USB2_SUSPEND_N_SEL BIT(3)
> +#define VBUS_DET_EXT_SEL BIT(4)
> +
> +#define USB_PHY_CFG_CTRL_4 (0x68)
> +#define PHY_CFG_PLL_GMP_CNTRL_MASK GENMASK(1, 0)
> +#define PHY_CFG_PLL_INT_CNTRL_MASK GENMASK(7, 2)
> +
> +#define USB_PHY_CFG_CTRL_5 (0x6c)
> +#define PHY_CFG_PLL_PROP_CNTRL_MASK GENMASK(4, 0)
> +#define PHY_CFG_PLL_VREF_TUNE_MASK GENMASK(7, 6)
> +
> +#define USB_PHY_CFG_CTRL_6 (0x70)
> +#define PHY_CFG_PLL_VCO_CNTRL_MASK GENMASK(2, 0)
> +
> +#define USB_PHY_CFG_CTRL_7 (0x74)
> +
> +#define USB_PHY_CFG_CTRL_8 (0x78)
> +#define PHY_CFG_TX_FSLS_VREF_TUNE_MASK GENMASK(1, 0)
> +#define PHY_CFG_TX_FSLS_VREG_BYPASS BIT(2)
> +#define PHY_CFG_TX_HS_VREF_TUNE_MASK GENMASK(5, 3)
> +#define PHY_CFG_TX_HS_XV_TUNE_MASK GENMASK(7, 6)
> +
> +#define USB_PHY_CFG_CTRL_9 (0x7c)
> +#define PHY_CFG_TX_PREEMP_TUNE_MASK GENMASK(2, 0)
> +#define PHY_CFG_TX_RES_TUNE_MASK GENMASK(4, 3)
> +#define PHY_CFG_TX_RISE_TUNE_MASK GENMASK(6, 5)
> +#define PHY_CFG_RCAL_BYPASS BIT(7)
> +
> +#define USB_PHY_CFG_CTRL_10 (0x80)
> +
> +#define USB_PHY_CFG0 (0x94)
> +#define DATAPATH_CTRL_OVERRIDE_EN BIT(0)
> +#define CMN_CTRL_OVERRIDE_EN BIT(1)
> +
> +#define UTMI_PHY_CMN_CTRL0 (0x98)
> +#define TESTBURNIN BIT(6)
> +
> +#define USB_PHY_FSEL_SEL (0xb8)
> +#define FSEL_SEL BIT(0)
> +
> +#define USB_PHY_APB_ACCESS_CMD (0x130)
> +#define RW_ACCESS BIT(0)
> +#define APB_START_CMD BIT(1)
> +#define APB_LOGIC_RESET BIT(2)
> +
> +#define USB_PHY_APB_ACCESS_STATUS (0x134)
> +#define ACCESS_DONE BIT(0)
> +#define TIMED_OUT BIT(1)
> +#define ACCESS_ERROR BIT(2)
> +#define ACCESS_IN_PROGRESS BIT(3)
> +
> +#define USB_PHY_APB_ADDRESS (0x138)
> +#define APB_REG_ADDR_MASK GENMASK(7, 0)
> +
> +#define USB_PHY_APB_WRDATA_LSB (0x13c)
> +#define APB_REG_WRDATA_7_0_MASK GENMASK(3, 0)
> +
> +#define USB_PHY_APB_WRDATA_MSB (0x140)
> +#define APB_REG_WRDATA_15_8_MASK GENMASK(7, 4)
> +
> +#define USB_PHY_APB_RDDATA_LSB (0x144)
> +#define APB_REG_RDDATA_7_0_MASK GENMASK(3, 0)
> +
> +#define USB_PHY_APB_RDDATA_MSB (0x148)
> +#define APB_REG_RDDATA_15_8_MASK GENMASK(7, 4)
> +
> +static const char * const qcom_snps_eusb2_hsphy_vreg_names[] = {
> + "vdd", "vdda12",
> +};
> +
> +#define EUSB2_NUM_VREGS ARRAY_SIZE(qcom_snps_eusb2_hsphy_vreg_names)

that_is_a_very_long_name, maybe eusb2_vreg_names ?

local structs needs not have qcom_snps_eusb2_foo eusb2_foo may suffice

> +
> +struct qcom_snps_eusb2_hsphy {
> + struct phy *phy;
> + void __iomem *base;
> +
> + struct clk *ref_clk;
> + struct reset_control *phy_reset;
> +
> + struct regulator_bulk_data vregs[EUSB2_NUM_VREGS];
> +
> + enum phy_mode mode;
> +};
> +
> +static int qcom_snps_eusb2_hsphy_set_mode(struct phy *p, enum phy_mode mode, int submode)
> +{
> + struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);
> +
> + phy->mode = mode;
> +
> + return 0;
> +}
> +
> +static void qcom_snps_eusb2_hsphy_write_mask(void __iomem *base, u32 offset,
> + u32 mask, u32 val)

align with preceding open please

> +{
> + u32 reg;
> +
> + reg = readl_relaxed(base + offset);
> + reg &= ~mask;
> + reg |= val & mask;
> + writel_relaxed(reg, base + offset);
> +
> + /* Ensure above write is completed */
> + readl_relaxed(base + offset);
> +}
> +
> +static void qcom_eusb2_default_parameters(struct qcom_snps_eusb2_hsphy *phy)
> +{
> + /* default parameters: tx pre-emphasis */
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
> + PHY_CFG_TX_PREEMP_TUNE_MASK,
> + FIELD_PREP(PHY_CFG_TX_PREEMP_TUNE_MASK, 0));
> +
> + /* tx rise/fall time */
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
> + PHY_CFG_TX_RISE_TUNE_MASK,
> + FIELD_PREP(PHY_CFG_TX_RISE_TUNE_MASK, 0x2));
> +
> + /* source impedance adjustment */
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_9,
> + PHY_CFG_TX_RES_TUNE_MASK,
> + FIELD_PREP(PHY_CFG_TX_RES_TUNE_MASK, 0x1));
> +
> + /* dc voltage level adjustement */
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_8,
> + PHY_CFG_TX_HS_VREF_TUNE_MASK,
> + FIELD_PREP(PHY_CFG_TX_HS_VREF_TUNE_MASK, 0x3));
> +
> + /* transmitter HS crossover adjustement */
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_8,
> + PHY_CFG_TX_HS_XV_TUNE_MASK,
> + FIELD_PREP(PHY_CFG_TX_HS_XV_TUNE_MASK, 0x0));
> +}
> +
> +static int qcom_eusb2_ref_clk_init(struct qcom_snps_eusb2_hsphy *phy)
> +{
> + unsigned long ref_clk_freq = clk_get_rate(clk_get_parent(phy->ref_clk));
> +
> + switch (ref_clk_freq) {
> + case 19200000:
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
> + FSEL_MASK,
> + FIELD_PREP(FSEL_MASK, FSEL_19_2_MHZ_VAL));
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_2,
> + PHY_CFG_PLL_FB_DIV_7_0_MASK,
> + DIV_7_0_19_2_MHZ_VAL);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
> + PHY_CFG_PLL_FB_DIV_11_8_MASK,
> + DIV_11_8_19_2_MHZ_VAL);
> + break;

empty line here

> + case 38400000:
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
> + FSEL_MASK,
> + FIELD_PREP(FSEL_MASK, FSEL_38_4_MHZ_VAL));
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_2,
> + PHY_CFG_PLL_FB_DIV_7_0_MASK,
> + DIV_7_0_38_4_MHZ_VAL);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
> + PHY_CFG_PLL_FB_DIV_11_8_MASK,
> + DIV_11_8_38_4_MHZ_VAL);
> + break;
> + default:
> + dev_err(&phy->phy->dev, "unsupported ref_clk_freq:%lu\n",
> + ref_clk_freq);
> + return -EINVAL;
> + }
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_3,
> + PHY_CFG_PLL_REF_DIV, PLL_REF_DIV_VAL);
> +
> + return 0;
> +}
> +
> +static int qcom_snps_eusb2_hsphy_init(struct phy *p)
> +{
> + struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);
> + int ret;
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(phy->vregs), phy->vregs);
> + if (ret)
> + return ret;
> +
> + ret = clk_prepare_enable(phy->ref_clk);
> + if (ret) {
> + dev_err(&p->dev, "failed to enable ref clock, %d\n", ret);
> + goto disable_vreg;
> + }
> +
> + ret = reset_control_assert(phy->phy_reset);
> + if (ret) {
> + dev_err(&p->dev, "failed to assert phy_reset, %d\n", ret);
> + goto disable_ref_clk;
> + }
> +
> + usleep_range(100, 150);
> +
> + ret = reset_control_deassert(phy->phy_reset);
> + if (ret) {
> + dev_err(&p->dev, "failed to de-assert phy_reset, %d\n", ret);
> + goto disable_ref_clk;
> + }
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG0,
> + CMN_CTRL_OVERRIDE_EN, CMN_CTRL_OVERRIDE_EN);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL5, POR, POR);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
> + PHY_ENABLE | RETENABLEN, PHY_ENABLE | RETENABLEN);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_APB_ACCESS_CMD,
> + APB_LOGIC_RESET, APB_LOGIC_RESET);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, UTMI_PHY_CMN_CTRL0, TESTBURNIN, 0);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_FSEL_SEL,
> + FSEL_SEL, FSEL_SEL);
> +
> + /* update ref_clk related registers */
> + ret = qcom_eusb2_ref_clk_init(phy);
> + if (ret)
> + goto disable_ref_clk;
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_1,
> + PHY_CFG_PLL_CPBIAS_CNTRL_MASK,
> + FIELD_PREP(PHY_CFG_PLL_CPBIAS_CNTRL_MASK, 0x1));
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_4,
> + PHY_CFG_PLL_INT_CNTRL_MASK,
> + FIELD_PREP(PHY_CFG_PLL_INT_CNTRL_MASK, 0x8));
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_4,
> + PHY_CFG_PLL_GMP_CNTRL_MASK,
> + FIELD_PREP(PHY_CFG_PLL_GMP_CNTRL_MASK, 0x1));
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_5,
> + PHY_CFG_PLL_PROP_CNTRL_MASK,
> + FIELD_PREP(PHY_CFG_PLL_PROP_CNTRL_MASK, 0x10));
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_6,
> + PHY_CFG_PLL_VCO_CNTRL_MASK,
> + FIELD_PREP(PHY_CFG_PLL_VCO_CNTRL_MASK, 0x0));
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_CFG_CTRL_5,
> + PHY_CFG_PLL_VREF_TUNE_MASK,
> + FIELD_PREP(PHY_CFG_PLL_VREF_TUNE_MASK, 0x1));
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
> + VBUS_DET_EXT_SEL, VBUS_DET_EXT_SEL);
> +
> + /* set default parameters */
> + qcom_eusb2_default_parameters(phy);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
> + USB2_SUSPEND_N_SEL | USB2_SUSPEND_N,
> + USB2_SUSPEND_N_SEL | USB2_SUSPEND_N);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL0, SLEEPM, SLEEPM);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
> + SIDDQ_SEL, SIDDQ_SEL);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL_COMMON0,
> + SIDDQ, 0);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_UTMI_CTRL5, POR, 0);
> +
> + qcom_snps_eusb2_hsphy_write_mask(phy->base, USB_PHY_HS_PHY_CTRL2,
> + USB2_SUSPEND_N_SEL, 0);
> +
> + return 0;
> +
> +disable_ref_clk:
> + clk_disable_unprepare(phy->ref_clk);
> +
> +disable_vreg:
> + regulator_bulk_disable(ARRAY_SIZE(phy->vregs), phy->vregs);
> +
> + return ret;
> +}
> +
> +static int qcom_snps_eusb2_hsphy_exit(struct phy *p)
> +{
> + struct qcom_snps_eusb2_hsphy *phy = phy_get_drvdata(p);
> +
> + clk_disable_unprepare(phy->ref_clk);
> +
> + regulator_bulk_disable(ARRAY_SIZE(phy->vregs), phy->vregs);
> +
> + return 0;
> +}
> +
> +static const struct phy_ops qcom_snps_eusb2_hsphy_ops = {
> + .init = qcom_snps_eusb2_hsphy_init,
> + .exit = qcom_snps_eusb2_hsphy_exit,
> + .set_mode = qcom_snps_eusb2_hsphy_set_mode,
> + .owner = THIS_MODULE,
> +};
> +
> +static int qcom_snps_eusb2_hsphy_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct qcom_snps_eusb2_hsphy *phy;
> + struct phy_provider *phy_provider;
> + struct phy *generic_phy;
> + int ret, i;
> + int num;
> +
> + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> + if (!phy)
> + return -ENOMEM;
> +
> + phy->base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(phy->base))
> + return PTR_ERR(phy->base);
> +
> + phy->phy_reset = devm_reset_control_get_exclusive(dev, NULL);
> + if (IS_ERR(phy->phy_reset))
> + return PTR_ERR(phy->phy_reset);
> +
> + phy->ref_clk = devm_clk_get(dev, "ref");
> + if (IS_ERR(phy->ref_clk))
> + return dev_err_probe(dev, PTR_ERR(phy->ref_clk),
> + "failed to get ref clk\n");
> +
> + num = ARRAY_SIZE(phy->vregs);
> + for (i = 0; i < num; i++)
> + phy->vregs[i].supply = qcom_snps_eusb2_hsphy_vreg_names[i];
> +
> + ret = devm_regulator_bulk_get(dev, num, phy->vregs);
> + if (ret)
> + return dev_err_probe(dev, ret,
> + "failed to get regulator supplies\n");
> + generic_phy = devm_phy_create(dev, NULL, &qcom_snps_eusb2_hsphy_ops);
> + if (IS_ERR(generic_phy)) {
> + dev_err(dev, "failed to create phy %d\n", ret);
> + return PTR_ERR(generic_phy);
> + }
> +
> + dev_set_drvdata(dev, phy);
> + phy_set_drvdata(generic_phy, phy);
> +
> + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> + if (IS_ERR(phy_provider))
> + return PTR_ERR(phy_provider);
> +
> + dev_info(dev, "Registered Qcom-eUSB2 phy\n");
> +
> + return 0;
> +}
> +
> +static const struct of_device_id qcom_snps_eusb2_hsphy_of_match_table[] = {
> + { .compatible = "qcom,sm8550-snps-eusb2-phy", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, qcom_snps_eusb2_hsphy_of_match_table);
> +
> +static struct platform_driver qcom_snps_eusb2_hsphy_driver = {
> + .probe = qcom_snps_eusb2_hsphy_probe,
> + .driver = {
> + .name = "qcom-snps-eusb2-hsphy",
> + .of_match_table = qcom_snps_eusb2_hsphy_of_match_table,
> + },
> +};
> +
> +module_platform_driver(qcom_snps_eusb2_hsphy_driver);
> +MODULE_DESCRIPTION("Qualcomm SNPS eUSB2 HS PHY driver");
> +MODULE_LICENSE("GPL");
> --
> 2.34.1

--
~Vinod

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