1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * dwc3-of-simple.c - OF glue layer for simple integrations 4 * 5 * Copyright (c) 2015 Texas Instruments Incorporated - https://www.ti.com 6 * 7 * Author: Felipe Balbi <balbi@ti.com> 8 * 9 * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov 10 * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC 11 * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com> 12 */ 13 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/slab.h> 17 #include <linux/platform_device.h> 18 #include <linux/dma-mapping.h> 19 #include <linux/clk.h> 20 #include <linux/of.h> 21 #include <linux/of_platform.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/reset.h> 24 25 struct dwc3_of_simple { 26 struct device *dev; 27 struct clk_bulk_data *clks; 28 int num_clocks; 29 struct reset_control *resets; 30 bool need_reset; 31 }; 32 33 static int dwc3_of_simple_probe(struct platform_device *pdev) 34 { 35 struct dwc3_of_simple *simple; 36 struct device *dev = &pdev->dev; 37 struct device_node *np = dev->of_node; 38 39 int ret; 40 41 simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL); 42 if (!simple) 43 return -ENOMEM; 44 45 platform_set_drvdata(pdev, simple); 46 simple->dev = dev; 47 48 /* 49 * Some controllers need to toggle the usb3-otg reset before trying to 50 * initialize the PHY, otherwise the PHY times out. 51 */ 52 if (of_device_is_compatible(np, "rockchip,rk3399-dwc3")) 53 simple->need_reset = true; 54 55 simple->resets = of_reset_control_array_get_optional_exclusive(np); 56 if (IS_ERR(simple->resets)) { 57 ret = PTR_ERR(simple->resets); 58 dev_err(dev, "failed to get device resets, err=%d\n", ret); 59 return ret; 60 } 61 62 ret = reset_control_deassert(simple->resets); 63 if (ret) 64 goto err_resetc_put; 65 66 ret = clk_bulk_get_all(simple->dev, &simple->clks); 67 if (ret < 0) 68 goto err_resetc_assert; 69 70 simple->num_clocks = ret; 71 ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks); 72 if (ret) 73 goto err_resetc_assert; 74 75 ret = of_platform_populate(np, NULL, NULL, dev); 76 if (ret) 77 goto err_clk_put; 78 79 pm_runtime_set_active(dev); 80 pm_runtime_enable(dev); 81 pm_runtime_get_sync(dev); 82 83 return 0; 84 85 err_clk_put: 86 clk_bulk_disable_unprepare(simple->num_clocks, simple->clks); 87 clk_bulk_put_all(simple->num_clocks, simple->clks); 88 89 err_resetc_assert: 90 reset_control_assert(simple->resets); 91 92 err_resetc_put: 93 reset_control_put(simple->resets); 94 return ret; 95 } 96 97 static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple) 98 { 99 of_platform_depopulate(simple->dev); 100 101 clk_bulk_disable_unprepare(simple->num_clocks, simple->clks); 102 clk_bulk_put_all(simple->num_clocks, simple->clks); 103 simple->num_clocks = 0; 104 105 reset_control_assert(simple->resets); 106 107 reset_control_put(simple->resets); 108 109 pm_runtime_disable(simple->dev); 110 pm_runtime_put_noidle(simple->dev); 111 pm_runtime_set_suspended(simple->dev); 112 } 113 114 static void dwc3_of_simple_remove(struct platform_device *pdev) 115 { 116 struct dwc3_of_simple *simple = platform_get_drvdata(pdev); 117 118 __dwc3_of_simple_teardown(simple); 119 } 120 121 static void dwc3_of_simple_shutdown(struct platform_device *pdev) 122 { 123 struct dwc3_of_simple *simple = platform_get_drvdata(pdev); 124 125 __dwc3_of_simple_teardown(simple); 126 } 127 128 static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev) 129 { 130 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 131 132 clk_bulk_disable(simple->num_clocks, simple->clks); 133 134 return 0; 135 } 136 137 static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev) 138 { 139 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 140 141 return clk_bulk_enable(simple->num_clocks, simple->clks); 142 } 143 144 static int __maybe_unused dwc3_of_simple_suspend(struct device *dev) 145 { 146 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 147 148 if (simple->need_reset) 149 reset_control_assert(simple->resets); 150 151 return 0; 152 } 153 154 static int __maybe_unused dwc3_of_simple_resume(struct device *dev) 155 { 156 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 157 158 if (simple->need_reset) 159 reset_control_deassert(simple->resets); 160 161 return 0; 162 } 163 164 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = { 165 SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume) 166 SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend, 167 dwc3_of_simple_runtime_resume, NULL) 168 }; 169 170 static const struct of_device_id of_dwc3_simple_match[] = { 171 { .compatible = "rockchip,rk3399-dwc3" }, 172 { .compatible = "sprd,sc9860-dwc3" }, 173 { .compatible = "allwinner,sun50i-h6-dwc3" }, 174 { .compatible = "hisilicon,hi3670-dwc3" }, 175 { .compatible = "hisilicon,hi3798mv200-dwc3" }, 176 { .compatible = "intel,keembay-dwc3" }, 177 { /* Sentinel */ } 178 }; 179 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match); 180 181 static struct platform_driver dwc3_of_simple_driver = { 182 .probe = dwc3_of_simple_probe, 183 .remove_new = dwc3_of_simple_remove, 184 .shutdown = dwc3_of_simple_shutdown, 185 .driver = { 186 .name = "dwc3-of-simple", 187 .of_match_table = of_dwc3_simple_match, 188 .pm = &dwc3_of_simple_dev_pm_ops, 189 }, 190 }; 191 192 module_platform_driver(dwc3_of_simple_driver); 193 MODULE_LICENSE("GPL v2"); 194 MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer"); 195 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); 196