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 - http://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 pulse_resets; 31 bool need_reset; 32 }; 33 34 static int dwc3_of_simple_probe(struct platform_device *pdev) 35 { 36 struct dwc3_of_simple *simple; 37 struct device *dev = &pdev->dev; 38 struct device_node *np = dev->of_node; 39 40 int ret; 41 bool shared_resets = false; 42 43 simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL); 44 if (!simple) 45 return -ENOMEM; 46 47 platform_set_drvdata(pdev, simple); 48 simple->dev = dev; 49 50 /* 51 * Some controllers need to toggle the usb3-otg reset before trying to 52 * initialize the PHY, otherwise the PHY times out. 53 */ 54 if (of_device_is_compatible(np, "rockchip,rk3399-dwc3")) 55 simple->need_reset = true; 56 57 if (of_device_is_compatible(np, "amlogic,meson-axg-dwc3") || 58 of_device_is_compatible(np, "amlogic,meson-gxl-dwc3")) { 59 shared_resets = true; 60 simple->pulse_resets = true; 61 } 62 63 simple->resets = of_reset_control_array_get(np, shared_resets, true, 64 true); 65 if (IS_ERR(simple->resets)) { 66 ret = PTR_ERR(simple->resets); 67 dev_err(dev, "failed to get device resets, err=%d\n", ret); 68 return ret; 69 } 70 71 if (simple->pulse_resets) { 72 ret = reset_control_reset(simple->resets); 73 if (ret) 74 goto err_resetc_put; 75 } else { 76 ret = reset_control_deassert(simple->resets); 77 if (ret) 78 goto err_resetc_put; 79 } 80 81 ret = clk_bulk_get_all(simple->dev, &simple->clks); 82 if (ret < 0) 83 goto err_resetc_assert; 84 85 simple->num_clocks = ret; 86 ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks); 87 if (ret) 88 goto err_resetc_assert; 89 90 ret = of_platform_populate(np, NULL, NULL, dev); 91 if (ret) 92 goto err_clk_put; 93 94 pm_runtime_set_active(dev); 95 pm_runtime_enable(dev); 96 pm_runtime_get_sync(dev); 97 98 return 0; 99 100 err_clk_put: 101 clk_bulk_disable_unprepare(simple->num_clocks, simple->clks); 102 clk_bulk_put_all(simple->num_clocks, simple->clks); 103 104 err_resetc_assert: 105 if (!simple->pulse_resets) 106 reset_control_assert(simple->resets); 107 108 err_resetc_put: 109 reset_control_put(simple->resets); 110 return ret; 111 } 112 113 static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple) 114 { 115 of_platform_depopulate(simple->dev); 116 117 clk_bulk_disable_unprepare(simple->num_clocks, simple->clks); 118 clk_bulk_put_all(simple->num_clocks, simple->clks); 119 simple->num_clocks = 0; 120 121 if (!simple->pulse_resets) 122 reset_control_assert(simple->resets); 123 124 reset_control_put(simple->resets); 125 126 pm_runtime_disable(simple->dev); 127 pm_runtime_put_noidle(simple->dev); 128 pm_runtime_set_suspended(simple->dev); 129 } 130 131 static int dwc3_of_simple_remove(struct platform_device *pdev) 132 { 133 struct dwc3_of_simple *simple = platform_get_drvdata(pdev); 134 135 __dwc3_of_simple_teardown(simple); 136 137 return 0; 138 } 139 140 static void dwc3_of_simple_shutdown(struct platform_device *pdev) 141 { 142 struct dwc3_of_simple *simple = platform_get_drvdata(pdev); 143 144 __dwc3_of_simple_teardown(simple); 145 } 146 147 static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev) 148 { 149 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 150 151 clk_bulk_disable(simple->num_clocks, simple->clks); 152 153 return 0; 154 } 155 156 static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev) 157 { 158 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 159 160 return clk_bulk_enable(simple->num_clocks, simple->clks); 161 } 162 163 static int __maybe_unused dwc3_of_simple_suspend(struct device *dev) 164 { 165 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 166 167 if (simple->need_reset) 168 reset_control_assert(simple->resets); 169 170 return 0; 171 } 172 173 static int __maybe_unused dwc3_of_simple_resume(struct device *dev) 174 { 175 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 176 177 if (simple->need_reset) 178 reset_control_deassert(simple->resets); 179 180 return 0; 181 } 182 183 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = { 184 SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume) 185 SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend, 186 dwc3_of_simple_runtime_resume, NULL) 187 }; 188 189 static const struct of_device_id of_dwc3_simple_match[] = { 190 { .compatible = "rockchip,rk3399-dwc3" }, 191 { .compatible = "xlnx,zynqmp-dwc3" }, 192 { .compatible = "cavium,octeon-7130-usb-uctl" }, 193 { .compatible = "sprd,sc9860-dwc3" }, 194 { .compatible = "amlogic,meson-axg-dwc3" }, 195 { .compatible = "amlogic,meson-gxl-dwc3" }, 196 { .compatible = "allwinner,sun50i-h6-dwc3" }, 197 { /* Sentinel */ } 198 }; 199 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match); 200 201 static struct platform_driver dwc3_of_simple_driver = { 202 .probe = dwc3_of_simple_probe, 203 .remove = dwc3_of_simple_remove, 204 .shutdown = dwc3_of_simple_shutdown, 205 .driver = { 206 .name = "dwc3-of-simple", 207 .of_match_table = of_dwc3_simple_match, 208 .pm = &dwc3_of_simple_dev_pm_ops, 209 }, 210 }; 211 212 module_platform_driver(dwc3_of_simple_driver); 213 MODULE_LICENSE("GPL v2"); 214 MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer"); 215 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); 216