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(np, false, true, 56 true); 57 if (IS_ERR(simple->resets)) { 58 ret = PTR_ERR(simple->resets); 59 dev_err(dev, "failed to get device resets, err=%d\n", ret); 60 return ret; 61 } 62 63 ret = reset_control_deassert(simple->resets); 64 if (ret) 65 goto err_resetc_put; 66 67 ret = clk_bulk_get_all(simple->dev, &simple->clks); 68 if (ret < 0) 69 goto err_resetc_assert; 70 71 simple->num_clocks = ret; 72 ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks); 73 if (ret) 74 goto err_resetc_assert; 75 76 ret = of_platform_populate(np, NULL, NULL, dev); 77 if (ret) 78 goto err_clk_put; 79 80 pm_runtime_set_active(dev); 81 pm_runtime_enable(dev); 82 pm_runtime_get_sync(dev); 83 84 return 0; 85 86 err_clk_put: 87 clk_bulk_disable_unprepare(simple->num_clocks, simple->clks); 88 clk_bulk_put_all(simple->num_clocks, simple->clks); 89 90 err_resetc_assert: 91 reset_control_assert(simple->resets); 92 93 err_resetc_put: 94 reset_control_put(simple->resets); 95 return ret; 96 } 97 98 static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple) 99 { 100 of_platform_depopulate(simple->dev); 101 102 clk_bulk_disable_unprepare(simple->num_clocks, simple->clks); 103 clk_bulk_put_all(simple->num_clocks, simple->clks); 104 simple->num_clocks = 0; 105 106 reset_control_assert(simple->resets); 107 108 reset_control_put(simple->resets); 109 110 pm_runtime_disable(simple->dev); 111 pm_runtime_put_noidle(simple->dev); 112 pm_runtime_set_suspended(simple->dev); 113 } 114 115 static int dwc3_of_simple_remove(struct platform_device *pdev) 116 { 117 struct dwc3_of_simple *simple = platform_get_drvdata(pdev); 118 119 __dwc3_of_simple_teardown(simple); 120 121 return 0; 122 } 123 124 static void dwc3_of_simple_shutdown(struct platform_device *pdev) 125 { 126 struct dwc3_of_simple *simple = platform_get_drvdata(pdev); 127 128 __dwc3_of_simple_teardown(simple); 129 } 130 131 static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev) 132 { 133 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 134 135 clk_bulk_disable(simple->num_clocks, simple->clks); 136 137 return 0; 138 } 139 140 static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev) 141 { 142 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 143 144 return clk_bulk_enable(simple->num_clocks, simple->clks); 145 } 146 147 static int __maybe_unused dwc3_of_simple_suspend(struct device *dev) 148 { 149 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 150 151 if (simple->need_reset) 152 reset_control_assert(simple->resets); 153 154 return 0; 155 } 156 157 static int __maybe_unused dwc3_of_simple_resume(struct device *dev) 158 { 159 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 160 161 if (simple->need_reset) 162 reset_control_deassert(simple->resets); 163 164 return 0; 165 } 166 167 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = { 168 SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume) 169 SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend, 170 dwc3_of_simple_runtime_resume, NULL) 171 }; 172 173 static const struct of_device_id of_dwc3_simple_match[] = { 174 { .compatible = "rockchip,rk3399-dwc3" }, 175 { .compatible = "xlnx,zynqmp-dwc3" }, 176 { .compatible = "cavium,octeon-7130-usb-uctl" }, 177 { .compatible = "sprd,sc9860-dwc3" }, 178 { .compatible = "allwinner,sun50i-h6-dwc3" }, 179 { .compatible = "hisilicon,hi3670-dwc3" }, 180 { .compatible = "intel,keembay-dwc3" }, 181 { /* Sentinel */ } 182 }; 183 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match); 184 185 static struct platform_driver dwc3_of_simple_driver = { 186 .probe = dwc3_of_simple_probe, 187 .remove = dwc3_of_simple_remove, 188 .shutdown = dwc3_of_simple_shutdown, 189 .driver = { 190 .name = "dwc3-of-simple", 191 .of_match_table = of_dwc3_simple_match, 192 .pm = &dwc3_of_simple_dev_pm_ops, 193 }, 194 }; 195 196 module_platform_driver(dwc3_of_simple_driver); 197 MODULE_LICENSE("GPL v2"); 198 MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer"); 199 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); 200