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Thu, 02 Feb 2023 05:38:31 -0800 (PST) Received: from hackbox.lan ([94.52.112.99]) by smtp.gmail.com with ESMTPSA id y10-20020a05600c364a00b003daf7721bb3sm4672657wmq.12.2023.02.02.05.38.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Feb 2023 05:38:31 -0800 (PST) From: Abel Vesa To: Andy Gross , Bjorn Andersson , Konrad Dybcio , Lee Jones , Rob Herring , Krzysztof Kozlowski , "vkoul@kernel.org" , Kishon Vijay Abraham I Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, Linux Kernel Mailing List , linux-phy@lists.infradead.org Subject: [RFC v3 4/7] phy: qcom: Add QCOM SNPS eUSB2 repeater driver Date: Thu, 2 Feb 2023 15:38:13 +0200 Message-Id: <20230202133816.4026990-5-abel.vesa@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230202133816.4026990-1-abel.vesa@linaro.org> References: <20230202133816.4026990-1-abel.vesa@linaro.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230202_053833_040201_935E7780 X-CRM114-Status: GOOD ( 27.10 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org 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 --- 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 +#include +#include +#include +#include +#include +#include + +/* 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 + +#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 */ + 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; + 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); + 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");