drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2018 John Crispin <john@phrozen.org>
   4  *
   5  * Based on code from
   6  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
   7  *
   8  */
   9
  10 #include <linux/delay.h>
  11 #include <linux/err.h>
  12 #include <linux/io.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/mutex.h>
  16 #include <linux/of.h>
  17 #include <linux/phy/phy.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/reset.h>
  20
  21 struct ipq4019_usb_phy {
  22         struct device           *dev;
  23         struct phy              *phy;
  24         void __iomem            *base;
  25         struct reset_control    *por_rst;
  26         struct reset_control    *srif_rst;
  27 };
  28
  29 static int ipq4019_ss_phy_power_off(struct phy *_phy)
  30 {
  31         struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
  32
  33         reset_control_assert(phy->por_rst);
  34         msleep(10);
  35
  36         return 0;
  37 }
  38
  39 static int ipq4019_ss_phy_power_on(struct phy *_phy)
  40 {
  41         struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
  42
  43         ipq4019_ss_phy_power_off(_phy);
  44
  45         reset_control_deassert(phy->por_rst);
  46
  47         return 0;
  48 }
  49
  50 static const struct phy_ops ipq4019_usb_ss_phy_ops = {
  51         .power_on       = ipq4019_ss_phy_power_on,
  52         .power_off      = ipq4019_ss_phy_power_off,
  53 };
  54
  55 static int ipq4019_hs_phy_power_off(struct phy *_phy)
  56 {
  57         struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
  58
  59         reset_control_assert(phy->por_rst);
  60         msleep(10);
  61
  62         reset_control_assert(phy->srif_rst);
  63         msleep(10);
  64
  65         return 0;
  66 }
  67
  68 static int ipq4019_hs_phy_power_on(struct phy *_phy)
  69 {
  70         struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
  71
  72         ipq4019_hs_phy_power_off(_phy);
  73
  74         reset_control_deassert(phy->srif_rst);
  75         msleep(10);
  76
  77         reset_control_deassert(phy->por_rst);
  78
  79         return 0;
  80 }
  81
  82 static const struct phy_ops ipq4019_usb_hs_phy_ops = {
  83         .power_on       = ipq4019_hs_phy_power_on,
  84         .power_off      = ipq4019_hs_phy_power_off,
  85 };
  86
  87 static const struct of_device_id ipq4019_usb_phy_of_match[] = {
  88         { .compatible = "qcom,usb-hs-ipq4019-phy", .data = &ipq4019_usb_hs_phy_ops},
  89         { .compatible = "qcom,usb-ss-ipq4019-phy", .data = &ipq4019_usb_ss_phy_ops},
  90         { },
  91 };
  92 MODULE_DEVICE_TABLE(of, ipq4019_usb_phy_of_match);
  93
  94 static int ipq4019_usb_phy_probe(struct platform_device *pdev)
  95 {
  96         struct device *dev = &pdev->dev;
  97         struct phy_provider *phy_provider;
  98         struct ipq4019_usb_phy *phy;
  99
 100         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 101         if (!phy)
 102                 return -ENOMEM;
 103
 104         phy->dev = &pdev->dev;
 105         phy->base = devm_platform_ioremap_resource(pdev, 0);
 106         if (IS_ERR(phy->base)) {
 107                 dev_err(dev, "failed to remap register memory\n");
 108                 return PTR_ERR(phy->base);
 109         }
 110
 111         phy->por_rst = devm_reset_control_get(phy->dev, "por_rst");
 112         if (IS_ERR(phy->por_rst)) {
 113                 if (PTR_ERR(phy->por_rst) != -EPROBE_DEFER)
 114                         dev_err(dev, "POR reset is missing\n");
 115                 return PTR_ERR(phy->por_rst);
 116         }
 117
 118         phy->srif_rst = devm_reset_control_get_optional(phy->dev, "srif_rst");
 119         if (IS_ERR(phy->srif_rst))
 120                 return PTR_ERR(phy->srif_rst);
 121
 122         phy->phy = devm_phy_create(dev, NULL, of_device_get_match_data(dev));
 123         if (IS_ERR(phy->phy)) {
 124                 dev_err(dev, "failed to create PHY\n");
 125                 return PTR_ERR(phy->phy);
 126         }
 127         phy_set_drvdata(phy->phy, phy);
 128
 129         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 130
 131         return PTR_ERR_OR_ZERO(phy_provider);
 132 }
 133
 134 static struct platform_driver ipq4019_usb_phy_driver = {
 135         .probe  = ipq4019_usb_phy_probe,
 136         .driver = {
 137                 .of_match_table = ipq4019_usb_phy_of_match,
 138                 .name  = "ipq4019-usb-phy",
 139         }
 140 };
 141 module_platform_driver(ipq4019_usb_phy_driver);
 142
 143 MODULE_DESCRIPTION("QCOM/IPQ4019 USB phy driver");
 144 MODULE_AUTHOR("John Crispin <john@phrozen.org>");
 145 MODULE_LICENSE("GPL v2");