On 02-02-23, 15:38, Abel Vesa wrote:
> PM8550B contains a eUSB2 repeater used for making the eUSB2 from
> SM8550 USB 2.0 compliant. This can be modelled SW-wise as a Phy.
> So add a new phy driver for it.
>
> Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
> ---
> drivers/phy/qualcomm/Kconfig | 9 +
> drivers/phy/qualcomm/Makefile | 1 +
> .../phy/qualcomm/phy-qcom-eusb2-repeater.c | 278 ++++++++++++++++++
> 3 files changed, 288 insertions(+)
> create mode 100644 drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
>
> diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
> index 27b5a2a3637d..a70631b04522 100644
> --- a/drivers/phy/qualcomm/Kconfig
> +++ b/drivers/phy/qualcomm/Kconfig
> @@ -79,6 +79,15 @@ config PHY_QCOM_SNPS_EUSB2
> chipsets. The PHY is paired with a Synopsys DWC3 USB controller
> on Qualcomm SOCs.
>
> +config PHY_QCOM_EUSB2_REPEATER
> + tristate "Qualcomm SNPS eUSB2 Repeater Driver"
> + depends on OF && (ARCH_QCOM || COMPILE_TEST)
> + select GENERIC_PHY
> + help
> + Enable support for the USB high-speed SNPS eUSB2 repeater on Qualcomm
> + PMICs. The repeater is paired with a Synopsys eUSB2 Phy
> + 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 3ee118f4dfc7..7dcba9537b69 100644
> --- a/drivers/phy/qualcomm/Makefile
> +++ b/drivers/phy/qualcomm/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_PHY_QCOM_QMP) += \
>
> obj-$(CONFIG_PHY_QCOM_QUSB2) += phy-qcom-qusb2.o
> obj-$(CONFIG_PHY_QCOM_SNPS_EUSB2) += phy-qcom-snps-eusb2.o
> +obj-$(CONFIG_PHY_QCOM_EUSB2_REPEATER) += phy-qcom-eusb2-repeater.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-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
> new file mode 100644
> index 000000000000..f7f822f2973f
> --- /dev/null
> +++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
> @@ -0,0 +1,278 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2023, Linaro Limited
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/regmap.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/phy/phy.h>
> +
> +/* eUSB2 status registers */
> +#define EUSB2_RPTR_STATUS 0x08
> +#define RPTR_OK BIT(7)
> +
> +/* eUSB2 control registers */
> +#define EUSB2_EN_CTL1 0x46
> +#define EUSB2_RPTR_EN BIT(7)
> +
> +#define PHY_HOST_MODE BIT(0)
> +#define EUSB2_FORCE_EN_5 0xE8
> +#define F_CLK_19P2M_EN BIT(6)
> +#define F_CLK_19P2M_EN_SHIFT 6
Why use shifts, use FIELD_{PREP|GET} instead
> +
> +#define EUSB2_FORCE_VAL_5 0xED
> +#define V_CLK_19P2M_EN BIT(6)
> +#define V_CLK_19P2M_EN_SHIFT 6
> +
> +#define EUSB2_TUNE_IUSB2 0x51
> +#define EUSB2_TUNE_SQUELCH_U 0x54
> +#define EUSB2_TUNE_USB2_PREEM 0x57
> +
> +#define QCOM_EUSB2_REPEATER_INIT_CFG(o, v) \
> + { \
> + .offset = o, \
> + .val = v, \
> + }
> +
> +enum repeater_mode {
> + REPEATER_HOST_MODE,
> + REPEATER_PERIPH_MODE,
> +};
> +
> +struct eusb2_repeater_init_tbl {
> + unsigned int offset;
> + unsigned int val;
> +};
> +
> +struct eusb2_repeater_cfg {
> + const struct eusb2_repeater_init_tbl *init_tbl;
> + int init_tbl_num;
> + /* regulators to be requested */
this comments is not very useful! either drop or add a meaningful
comment
> + const char * const *vreg_list;
> + int num_vregs;
> +};
> +
> +struct eusb2_repeater {
> + struct device *dev;
> + struct regmap *regmap;
> + struct phy *phy;
> + struct regulator_bulk_data *vregs;
> + const struct eusb2_repeater_cfg *cfg;
> + u16 base;
> + enum phy_mode mode;
> +};
> +
> +static const char * const pm8550b_vreg_l[] = {
> + "vdd18", "vdd3",
> +};
> +
> +static const struct eusb2_repeater_init_tbl pm8550b_init_tbl[] = {
> + QCOM_EUSB2_REPEATER_INIT_CFG(EUSB2_TUNE_IUSB2, 0x8),
> + QCOM_EUSB2_REPEATER_INIT_CFG(EUSB2_TUNE_SQUELCH_U, 0x3),
> + QCOM_EUSB2_REPEATER_INIT_CFG(EUSB2_TUNE_USB2_PREEM, 0x5),
> +};
> +
> +static const struct eusb2_repeater_cfg pm8550b_eusb2_cfg = {
> + .init_tbl = pm8550b_init_tbl,
> + .init_tbl_num = ARRAY_SIZE(pm8550b_init_tbl),
> + .vreg_list = pm8550b_vreg_l,
> + .num_vregs = ARRAY_SIZE(pm8550b_vreg_l),
> +};
> +
> +static int eusb2_repeater_init_vregs(struct eusb2_repeater *rptr)
> +{
> + int num = rptr->cfg->num_vregs;
> + struct device *dev = rptr->dev;
> + int i;
> +
> + rptr->vregs = devm_kcalloc(dev, num, sizeof(*rptr->vregs), GFP_KERNEL);
> + if (!rptr->vregs)
> + return -ENOMEM;
> +
> + for (i = 0; i < num; i++)
> + rptr->vregs[i].supply = rptr->cfg->vreg_list[i];
> +
> + return devm_regulator_bulk_get(dev, num, rptr->vregs);
> +}
> +
> +static int eusb2_repeater_init(struct phy *phy)
> +{
> + struct eusb2_repeater *rptr = phy_get_drvdata(phy);
> + const struct eusb2_repeater_init_tbl *init_tbl = rptr->cfg->init_tbl;
> + int num = rptr->cfg->init_tbl_num;
> + int ret = 0;
superfluous init
> + u32 val;
> + int i;
> +
> + ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs);
> + if (ret)
> + return ret;
> +
> + regmap_update_bits(rptr->regmap, rptr->base + EUSB2_EN_CTL1,
> + EUSB2_RPTR_EN, EUSB2_RPTR_EN);
> +
> + for (i = 0; i < num; i++)
> + regmap_update_bits(rptr->regmap,
> + rptr->base + init_tbl[i].offset,
> + init_tbl[i].val, init_tbl[i].val);
> +
> + ret = regmap_read_poll_timeout(rptr->regmap,
> + rptr->base + EUSB2_RPTR_STATUS, val,
> + val & RPTR_OK, 10, 5);
> + if (ret)
> + dev_err(rptr->dev, "initialization timed-out\n");
> +
> + return ret;
> +}
> +
> +static int eusb2_repeater_set_mode(struct phy *phy,
> + enum phy_mode mode, int submode)
> +{
> + struct eusb2_repeater *rptr = phy_get_drvdata(phy);
> +
> + switch (mode) {
> + case PHY_MODE_USB_HOST:
> + /*
> + * CM.Lx is prohibited when repeater is already into Lx state as
> + * per eUSB 1.2 Spec. Below implement software workaround until
> + * PHY and controller is fixing seen observation.
> + */
> + regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_EN_5,
> + F_CLK_19P2M_EN, F_CLK_19P2M_EN);
pls align to preceding open brace (hint checkpatch --strict would warn
you for this)
> + regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_VAL_5,
> + V_CLK_19P2M_EN, V_CLK_19P2M_EN);
> + break;
> + case PHY_MODE_USB_DEVICE:
> + /*
> + * In device mode clear host mode related workaround as there
> + * is no repeater reset available, and enable/disable of
> + * repeater doesn't clear previous value due to shared
> + * regulators (say host <-> device mode switch).
> + */
> + regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_EN_5,
> + F_CLK_19P2M_EN, 0);
> + regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_VAL_5,
> + V_CLK_19P2M_EN, 0);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int eusb2_repeater_exit(struct phy *phy)
> +{
> + struct eusb2_repeater *rptr = phy_get_drvdata(phy);
> +
> + return regulator_bulk_disable(rptr->cfg->num_vregs, rptr->vregs);
> +}
> +
> +
> +static const struct phy_ops eusb2_repeater_ops = {
> + .init = eusb2_repeater_init,
> + .exit = eusb2_repeater_exit,
> + .set_mode = eusb2_repeater_set_mode,
> + .owner = THIS_MODULE,
> +};
> +
> +static int eusb2_repeater_probe(struct platform_device *pdev)
> +{
> + struct eusb2_repeater *rptr;
> + struct device *dev = &pdev->dev;
> + struct phy_provider *phy_provider;
> + struct device_node *np;
> + u32 res;
> + int ret;
> +
> + np = of_node_get(dev->of_node);
> +
> + rptr = devm_kzalloc(dev, sizeof(*rptr), GFP_KERNEL);
> + if (!rptr)
> + goto err_node_put;
> +
> + rptr->dev = dev;
> + dev_set_drvdata(dev, rptr);
> +
> + rptr->cfg = of_device_get_match_data(dev);
> + if (!rptr->cfg)
> + goto err_node_put;
> +
> + rptr->regmap = dev_get_regmap(dev->parent, NULL);
> + if (!rptr->regmap)
> + goto err_node_put;
> +
> + ret = of_property_read_u32(np, "reg", &res);
> + if (ret < 0)
> + goto err_node_put;
> +
> + rptr->base = res;
> +
> + ret = eusb2_repeater_init_vregs(rptr);
> + if (ret < 0) {
> + dev_err(dev, "unable to get supplies\n");
> + goto err_node_put;
> + }
> +
> + rptr->phy = devm_phy_create(dev, np, &eusb2_repeater_ops);
> + if (IS_ERR(rptr->phy)) {
> + ret = PTR_ERR(rptr->phy);
> + dev_err(dev, "failed to create PHY: %d\n", ret);
> + goto err_node_put;
> + }
> +
> + phy_set_drvdata(rptr->phy, rptr);
> +
> + of_node_put(np);
> +
> + 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 repeater\n");
> +
> + return 0;
> +
> +err_node_put:
> + of_node_put(np);
> + return ret;
> +}
> +
> +static int eusb2_repeater_remove(struct platform_device *pdev)
> +{
> + struct eusb2_repeater *rptr = platform_get_drvdata(pdev);
> +
> + if (!rptr)
> + return 0;
> +
> + eusb2_repeater_exit(rptr->phy);
> + return 0;
> +}
> +
> +
> +static const struct of_device_id eusb2_repeater_of_match_table[] = {
> + {
> + .compatible = "qcom,pm8550b-eusb2-repeater",
> + .data = &pm8550b_eusb2_cfg,
> + },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, eusb2_repeater_of_match_table);
> +
> +static struct platform_driver eusb2_repeater_driver = {
> + .probe = eusb2_repeater_probe,
> + .remove = eusb2_repeater_remove,
> + .driver = {
> + .name = "qcom-eusb2-repeater",
> + .of_match_table = eusb2_repeater_of_match_table,
> + },
> +};
> +
> +module_platform_driver(eusb2_repeater_driver);
> +
> +MODULE_DESCRIPTION("Qualcomm PMIC eUSB2 Repeater driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.34.1
--
~Vinod
