drivers/phy/qualcomm/phy-qcom-usb-hsic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2016 Linaro Ltd
   4  */
   5 #include <linux/module.h>
   6 #include <linux/ulpi/driver.h>
   7 #include <linux/ulpi/regs.h>
   8 #include <linux/phy/phy.h>
   9 #include <linux/pinctrl/consumer.h>
  10 #include <linux/pinctrl/pinctrl-state.h>
  11 #include <linux/delay.h>
  12 #include <linux/clk.h>
  13
  14 #define ULPI_HSIC_CFG           0x30
  15 #define ULPI_HSIC_IO_CAL        0x33
  16
  17 struct qcom_usb_hsic_phy {
  18         struct ulpi *ulpi;
  19         struct phy *phy;
  20         struct pinctrl *pctl;
  21         struct clk *phy_clk;
  22         struct clk *cal_clk;
  23         struct clk *cal_sleep_clk;
  24 };
  25
  26 static int qcom_usb_hsic_phy_power_on(struct phy *phy)
  27 {
  28         struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
  29         struct ulpi *ulpi = uphy->ulpi;
  30         struct pinctrl_state *pins_default;
  31         int ret;
  32
  33         ret = clk_prepare_enable(uphy->phy_clk);
  34         if (ret)
  35                 return ret;
  36
  37         ret = clk_prepare_enable(uphy->cal_clk);
  38         if (ret)
  39                 goto err_cal;
  40
  41         ret = clk_prepare_enable(uphy->cal_sleep_clk);
  42         if (ret)
  43                 goto err_sleep;
  44
  45         /* Set periodic calibration interval to ~2.048sec in HSIC_IO_CAL_REG */
  46         ret = ulpi_write(ulpi, ULPI_HSIC_IO_CAL, 0xff);
  47         if (ret)
  48                 goto err_ulpi;
  49
  50         /* Enable periodic IO calibration in HSIC_CFG register */
  51         ret = ulpi_write(ulpi, ULPI_HSIC_CFG, 0xa8);
  52         if (ret)
  53                 goto err_ulpi;
  54
  55         /* Configure pins for HSIC functionality */
  56         pins_default = pinctrl_lookup_state(uphy->pctl, PINCTRL_STATE_DEFAULT);
  57         if (IS_ERR(pins_default)) {
  58                 ret = PTR_ERR(pins_default);
  59                 goto err_ulpi;
  60         }
  61
  62         ret = pinctrl_select_state(uphy->pctl, pins_default);
  63         if (ret)
  64                 goto err_ulpi;
  65
  66          /* Enable HSIC mode in HSIC_CFG register */
  67         ret = ulpi_write(ulpi, ULPI_SET(ULPI_HSIC_CFG), 0x01);
  68         if (ret)
  69                 goto err_ulpi;
  70
  71         /* Disable auto-resume */
  72         ret = ulpi_write(ulpi, ULPI_CLR(ULPI_IFC_CTRL),
  73                          ULPI_IFC_CTRL_AUTORESUME);
  74         if (ret)
  75                 goto err_ulpi;
  76
  77         return ret;
  78 err_ulpi:
  79         clk_disable_unprepare(uphy->cal_sleep_clk);
  80 err_sleep:
  81         clk_disable_unprepare(uphy->cal_clk);
  82 err_cal:
  83         clk_disable_unprepare(uphy->phy_clk);
  84         return ret;
  85 }
  86
  87 static int qcom_usb_hsic_phy_power_off(struct phy *phy)
  88 {
  89         struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
  90
  91         clk_disable_unprepare(uphy->cal_sleep_clk);
  92         clk_disable_unprepare(uphy->cal_clk);
  93         clk_disable_unprepare(uphy->phy_clk);
  94
  95         return 0;
  96 }
  97
  98 static const struct phy_ops qcom_usb_hsic_phy_ops = {
  99         .power_on = qcom_usb_hsic_phy_power_on,
 100         .power_off = qcom_usb_hsic_phy_power_off,
 101         .owner = THIS_MODULE,
 102 };
 103
 104 static int qcom_usb_hsic_phy_probe(struct ulpi *ulpi)
 105 {
 106         struct qcom_usb_hsic_phy *uphy;
 107         struct phy_provider *p;
 108         struct clk *clk;
 109
 110         uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL);
 111         if (!uphy)
 112                 return -ENOMEM;
 113         ulpi_set_drvdata(ulpi, uphy);
 114
 115         uphy->ulpi = ulpi;
 116         uphy->pctl = devm_pinctrl_get(&ulpi->dev);
 117         if (IS_ERR(uphy->pctl))
 118                 return PTR_ERR(uphy->pctl);
 119
 120         uphy->phy_clk = clk = devm_clk_get(&ulpi->dev, "phy");
 121         if (IS_ERR(clk))
 122                 return PTR_ERR(clk);
 123
 124         uphy->cal_clk = clk = devm_clk_get(&ulpi->dev, "cal");
 125         if (IS_ERR(clk))
 126                 return PTR_ERR(clk);
 127
 128         uphy->cal_sleep_clk = clk = devm_clk_get(&ulpi->dev, "cal_sleep");
 129         if (IS_ERR(clk))
 130                 return PTR_ERR(clk);
 131
 132         uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node,
 133                                     &qcom_usb_hsic_phy_ops);
 134         if (IS_ERR(uphy->phy))
 135                 return PTR_ERR(uphy->phy);
 136         phy_set_drvdata(uphy->phy, uphy);
 137
 138         p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate);
 139         return PTR_ERR_OR_ZERO(p);
 140 }
 141
 142 static const struct of_device_id qcom_usb_hsic_phy_match[] = {
 143         { .compatible = "qcom,usb-hsic-phy", },
 144         { }
 145 };
 146 MODULE_DEVICE_TABLE(of, qcom_usb_hsic_phy_match);
 147
 148 static struct ulpi_driver qcom_usb_hsic_phy_driver = {
 149         .probe = qcom_usb_hsic_phy_probe,
 150         .driver = {
 151                 .name = "qcom_usb_hsic_phy",
 152                 .of_match_table = qcom_usb_hsic_phy_match,
 153         },
 154 };
 155 module_ulpi_driver(qcom_usb_hsic_phy_driver);
 156
 157 MODULE_DESCRIPTION("Qualcomm USB HSIC phy");
 158 MODULE_LICENSE("GPL v2");