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