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_put(simple->clks[i]); 56 return PTR_ERR(clk); 57 } 58 59 ret = clk_prepare_enable(clk); 60 if (ret < 0) { 61 while (--i >= 0) { 62 clk_disable_unprepare(simple->clks[i]); 63 clk_put(simple->clks[i]); 64 } 65 clk_put(clk); 66 67 return ret; 68 } 69 70 simple->clks[i] = clk; 71 } 72 73 return 0; 74 } 75 76 static int dwc3_of_simple_probe(struct platform_device *pdev) 77 { 78 struct dwc3_of_simple *simple; 79 struct device *dev = &pdev->dev; 80 struct device_node *np = dev->of_node; 81 82 int ret; 83 int i; 84 85 simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL); 86 if (!simple) 87 return -ENOMEM; 88 89 platform_set_drvdata(pdev, simple); 90 simple->dev = dev; 91 92 simple->resets = of_reset_control_array_get_optional_exclusive(np); 93 if (IS_ERR(simple->resets)) { 94 ret = PTR_ERR(simple->resets); 95 dev_err(dev, "failed to get device resets, err=%d\n", ret); 96 return ret; 97 } 98 99 ret = reset_control_deassert(simple->resets); 100 if (ret) 101 goto err_resetc_put; 102 103 ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np, 104 "clocks", "#clock-cells")); 105 if (ret) 106 goto err_resetc_assert; 107 108 ret = of_platform_populate(np, NULL, NULL, dev); 109 if (ret) { 110 for (i = 0; i < simple->num_clocks; i++) { 111 clk_disable_unprepare(simple->clks[i]); 112 clk_put(simple->clks[i]); 113 } 114 115 goto err_resetc_assert; 116 } 117 118 pm_runtime_set_active(dev); 119 pm_runtime_enable(dev); 120 pm_runtime_get_sync(dev); 121 122 return 0; 123 124 err_resetc_assert: 125 reset_control_assert(simple->resets); 126 127 err_resetc_put: 128 reset_control_put(simple->resets); 129 return ret; 130 } 131 132 static int dwc3_of_simple_remove(struct platform_device *pdev) 133 { 134 struct dwc3_of_simple *simple = platform_get_drvdata(pdev); 135 struct device *dev = &pdev->dev; 136 int i; 137 138 of_platform_depopulate(dev); 139 140 for (i = 0; i < simple->num_clocks; i++) { 141 clk_disable_unprepare(simple->clks[i]); 142 clk_put(simple->clks[i]); 143 } 144 145 reset_control_assert(simple->resets); 146 reset_control_put(simple->resets); 147 148 pm_runtime_put_sync(dev); 149 pm_runtime_disable(dev); 150 151 return 0; 152 } 153 154 #ifdef CONFIG_PM 155 static int dwc3_of_simple_runtime_suspend(struct device *dev) 156 { 157 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 158 int i; 159 160 for (i = 0; i < simple->num_clocks; i++) 161 clk_disable(simple->clks[i]); 162 163 return 0; 164 } 165 166 static int dwc3_of_simple_runtime_resume(struct device *dev) 167 { 168 struct dwc3_of_simple *simple = dev_get_drvdata(dev); 169 int ret; 170 int i; 171 172 for (i = 0; i < simple->num_clocks; i++) { 173 ret = clk_enable(simple->clks[i]); 174 if (ret < 0) { 175 while (--i >= 0) 176 clk_disable(simple->clks[i]); 177 return ret; 178 } 179 } 180 181 return 0; 182 } 183 #endif 184 185 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = { 186 SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend, 187 dwc3_of_simple_runtime_resume, NULL) 188 }; 189 190 static const struct of_device_id of_dwc3_simple_match[] = { 191 { .compatible = "qcom,dwc3" }, 192 { .compatible = "rockchip,rk3399-dwc3" }, 193 { .compatible = "xlnx,zynqmp-dwc3" }, 194 { .compatible = "cavium,octeon-7130-usb-uctl" }, 195 { .compatible = "sprd,sc9860-dwc3" }, 196 { /* Sentinel */ } 197 }; 198 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match); 199 200 static struct platform_driver dwc3_of_simple_driver = { 201 .probe = dwc3_of_simple_probe, 202 .remove = dwc3_of_simple_remove, 203 .driver = { 204 .name = "dwc3-of-simple", 205 .of_match_table = of_dwc3_simple_match, 206 }, 207 }; 208 209 module_platform_driver(dwc3_of_simple_driver); 210 MODULE_LICENSE("GPL v2"); 211 MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer"); 212 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); 213