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 **clks; 28 int num_clocks; 29 struct reset_control *resets; 30 }; 31 32 static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count) 33 { 34 struct device *dev = simple->dev; 35 struct device_node *np = dev->of_node; 36 int i; 37 38 simple->num_clocks = count; 39 40 if (!count) 41 return 0; 42 43 simple->clks = devm_kcalloc(dev, simple->num_clocks, 44 sizeof(struct clk *), GFP_KERNEL); 45 if (!simple->clks) 46 return -ENOMEM; 47 48 for (i = 0; i < simple->num_clocks; i++) { 49 struct clk *clk; 50 int ret; 51 52 clk = of_clk_get(np, i); 53 if (IS_ERR(clk)) { 54 while (--i >= 0) { 55 clk_disable_unprepare(simple->clks[i]); 56 clk_put(simple->clks[i]); 57 } 58 return PTR_ERR(clk); 59 } 60 61 ret = clk_prepare_enable(clk); 62 if (ret < 0) { 63 while (--i >= 0) { 64 clk_disable_unprepare(simple->clks[i]); 65 clk_put(simple->clks[i]); 66 } 67 clk_put(clk); 68 69 return ret; 70 } 71 72 simple->clks[i] = clk; 73 } 74 75 return 0; 76 } 77 78 static int dwc3_of_simple_probe(struct platform_device *pdev) 79 { 80 struct dwc3_of_simple *simple; 81 struct device *dev = &pdev->dev; 82 struct device_node *np = dev->of_node; 83 84 int ret; 85 int i; 86 87 simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL); 88 if (!simple) 89 return -ENOMEM; 90 91 platform_set_drvdata(pdev, simple); 92 simple->dev = dev; 93 94 simple->resets = of_reset_control_array_get_optional_exclusive(np); 95 if (IS_ERR(simple->resets)) { 96 ret = PTR_ERR(simple->resets); 97 dev_err(dev, "failed to get device resets, err=%d\n", ret); 98 return ret; 99 } 100 101 ret = reset_control_deassert(simple->resets); 102 if (ret) 103 goto err_resetc_put; 104 105 ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np, 106 "clocks", "#clock-cells")); 107 if (ret) 108 goto err_resetc_assert; 109 110 ret = of_platform_populate(np, NULL, NULL, dev); 111 if (ret) { 112 for (i = 0; i < simple->num_clocks; i++) { 113 clk_disable_unprepare(simple->clks[i]); 114 clk_put(simple->clks[i]); 115 } 116 117 goto err_resetc_assert; 118 } 119 120 pm_runtime_set_active(dev); 121 pm_runtime_enable(dev); 122 pm_runtime_get_sync(dev); 123 124 return 0; 125 126 err_resetc_assert: 127 reset_control_assert(simple->resets); 128 129 err_resetc_put: 130 reset_control_put(simple->resets); 131 return ret; 132 } 133 134 static int dwc3_of_simple_remove(struct platform_device *pdev) 135 { 136 struct dwc3_of_simple *simple = platform_get_drvdata(pdev); 137 struct device *dev = &pdev->dev; 138 int i; 139 140 of_platform_depopulate(dev); 141 142 for (i = 0; i < simple->num_clocks; i++) { 143 clk_disable_unprepare(simple->clks[i]); 144 clk_put(simple->clks[i]); 145 } 146 147 reset_control_assert(simple->resets); 148 reset_control_put(simple->resets); 149 150 pm_runtime_put_sync(dev); 151 pm_runtime_disable(dev); 152 153 return 0; 154 } 155 156 #ifdef CONFIG_PM 157 static int dwc3_of_simple_runtime_suspend(struct device *dev) 158 { 159 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 160 int i; 161 162 for (i = 0; i < simple->num_clocks; i++) 163 clk_disable(simple->clks[i]); 164 165 return 0; 166 } 167 168 static int dwc3_of_simple_runtime_resume(struct device *dev) 169 { 170 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 171 int ret; 172 int i; 173 174 for (i = 0; i < simple->num_clocks; i++) { 175 ret = clk_enable(simple->clks[i]); 176 if (ret < 0) { 177 while (--i >= 0) 178 clk_disable(simple->clks[i]); 179 return ret; 180 } 181 } 182 183 return 0; 184 } 185 #endif 186 187 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = { 188 SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend, 189 dwc3_of_simple_runtime_resume, NULL) 190 }; 191 192 static const struct of_device_id of_dwc3_simple_match[] = { 193 { .compatible = "qcom,dwc3" }, 194 { .compatible = "rockchip,rk3399-dwc3" }, 195 { .compatible = "xlnx,zynqmp-dwc3" }, 196 { .compatible = "cavium,octeon-7130-usb-uctl" }, 197 { .compatible = "sprd,sc9860-dwc3" }, 198 { /* Sentinel */ } 199 }; 200 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match); 201 202 static struct platform_driver dwc3_of_simple_driver = { 203 .probe = dwc3_of_simple_probe, 204 .remove = dwc3_of_simple_remove, 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