1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Central probing code for the FOTG210 dual role driver 4 * We register one driver for the hardware and then we decide 5 * whether to proceed with probing the host or the peripheral 6 * driver. 7 */ 8 #include <linux/bitops.h> 9 #include <linux/clk.h> 10 #include <linux/device.h> 11 #include <linux/mfd/syscon.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/platform_device.h> 15 #include <linux/regmap.h> 16 #include <linux/usb.h> 17 #include <linux/usb/otg.h> 18 19 #include "fotg210.h" 20 21 /* Role Register 0x80 */ 22 #define FOTG210_RR 0x80 23 #define FOTG210_RR_ID BIT(21) /* 1 = B-device, 0 = A-device */ 24 #define FOTG210_RR_CROLE BIT(20) /* 1 = device, 0 = host */ 25 26 /* 27 * Gemini-specific initialization function, only executed on the 28 * Gemini SoC using the global misc control register. 29 * 30 * The gemini USB blocks are connected to either Mini-A (host mode) or 31 * Mini-B (peripheral mode) plugs. There is no role switch support on the 32 * Gemini SoC, just either-or. 33 */ 34 #define GEMINI_GLOBAL_MISC_CTRL 0x30 35 #define GEMINI_MISC_USB0_WAKEUP BIT(14) 36 #define GEMINI_MISC_USB1_WAKEUP BIT(15) 37 #define GEMINI_MISC_USB0_VBUS_ON BIT(22) 38 #define GEMINI_MISC_USB1_VBUS_ON BIT(23) 39 #define GEMINI_MISC_USB0_MINI_B BIT(29) 40 #define GEMINI_MISC_USB1_MINI_B BIT(30) 41 42 static int fotg210_gemini_init(struct fotg210 *fotg, struct resource *res, 43 enum usb_dr_mode mode) 44 { 45 struct device *dev = fotg->dev; 46 struct device_node *np = dev->of_node; 47 struct regmap *map; 48 bool wakeup; 49 u32 mask, val; 50 int ret; 51 52 map = syscon_regmap_lookup_by_phandle(np, "syscon"); 53 if (IS_ERR(map)) 54 return dev_err_probe(dev, PTR_ERR(map), "no syscon\n"); 55 fotg->map = map; 56 wakeup = of_property_read_bool(np, "wakeup-source"); 57 58 /* 59 * Figure out if this is USB0 or USB1 by simply checking the 60 * physical base address. 61 */ 62 mask = 0; 63 if (res->start == 0x69000000) { 64 fotg->port = GEMINI_PORT_1; 65 mask = GEMINI_MISC_USB1_VBUS_ON | GEMINI_MISC_USB1_MINI_B | 66 GEMINI_MISC_USB1_WAKEUP; 67 if (mode == USB_DR_MODE_HOST) 68 val = GEMINI_MISC_USB1_VBUS_ON; 69 else 70 val = GEMINI_MISC_USB1_MINI_B; 71 if (wakeup) 72 val |= GEMINI_MISC_USB1_WAKEUP; 73 } else { 74 fotg->port = GEMINI_PORT_0; 75 mask = GEMINI_MISC_USB0_VBUS_ON | GEMINI_MISC_USB0_MINI_B | 76 GEMINI_MISC_USB0_WAKEUP; 77 if (mode == USB_DR_MODE_HOST) 78 val = GEMINI_MISC_USB0_VBUS_ON; 79 else 80 val = GEMINI_MISC_USB0_MINI_B; 81 if (wakeup) 82 val |= GEMINI_MISC_USB0_WAKEUP; 83 } 84 85 ret = regmap_update_bits(map, GEMINI_GLOBAL_MISC_CTRL, mask, val); 86 if (ret) { 87 dev_err(dev, "failed to initialize Gemini PHY\n"); 88 return ret; 89 } 90 91 dev_info(dev, "initialized Gemini PHY in %s mode\n", 92 (mode == USB_DR_MODE_HOST) ? "host" : "gadget"); 93 return 0; 94 } 95 96 /** 97 * fotg210_vbus() - Called by gadget driver to enable/disable VBUS 98 * @fotg: pointer to a private fotg210 object 99 * @enable: true to enable VBUS, false to disable VBUS 100 */ 101 void fotg210_vbus(struct fotg210 *fotg, bool enable) 102 { 103 u32 mask; 104 u32 val; 105 int ret; 106 107 switch (fotg->port) { 108 case GEMINI_PORT_0: 109 mask = GEMINI_MISC_USB0_VBUS_ON; 110 val = enable ? GEMINI_MISC_USB0_VBUS_ON : 0; 111 break; 112 case GEMINI_PORT_1: 113 mask = GEMINI_MISC_USB1_VBUS_ON; 114 val = enable ? GEMINI_MISC_USB1_VBUS_ON : 0; 115 break; 116 default: 117 return; 118 } 119 ret = regmap_update_bits(fotg->map, GEMINI_GLOBAL_MISC_CTRL, mask, val); 120 if (ret) 121 dev_err(fotg->dev, "failed to %s VBUS\n", 122 enable ? "enable" : "disable"); 123 dev_info(fotg->dev, "%s: %s VBUS\n", __func__, enable ? "enable" : "disable"); 124 } 125 126 static int fotg210_probe(struct platform_device *pdev) 127 { 128 struct device *dev = &pdev->dev; 129 enum usb_dr_mode mode; 130 struct fotg210 *fotg; 131 u32 val; 132 int ret; 133 134 fotg = devm_kzalloc(dev, sizeof(*fotg), GFP_KERNEL); 135 if (!fotg) 136 return -ENOMEM; 137 fotg->dev = dev; 138 139 fotg->base = devm_platform_get_and_ioremap_resource(pdev, 0, &fotg->res); 140 if (IS_ERR(fotg->base)) 141 return PTR_ERR(fotg->base); 142 143 fotg->pclk = devm_clk_get_optional_enabled(dev, "PCLK"); 144 if (IS_ERR(fotg->pclk)) 145 return PTR_ERR(fotg->pclk); 146 147 mode = usb_get_dr_mode(dev); 148 149 if (of_device_is_compatible(dev->of_node, "cortina,gemini-usb")) { 150 ret = fotg210_gemini_init(fotg, fotg->res, mode); 151 if (ret) 152 return ret; 153 } 154 155 val = readl(fotg->base + FOTG210_RR); 156 if (mode == USB_DR_MODE_PERIPHERAL) { 157 if (!(val & FOTG210_RR_CROLE)) 158 dev_err(dev, "block not in device role\n"); 159 ret = fotg210_udc_probe(pdev, fotg); 160 } else { 161 if (val & FOTG210_RR_CROLE) 162 dev_err(dev, "block not in host role\n"); 163 ret = fotg210_hcd_probe(pdev, fotg); 164 } 165 166 return ret; 167 } 168 169 static void fotg210_remove(struct platform_device *pdev) 170 { 171 struct device *dev = &pdev->dev; 172 enum usb_dr_mode mode; 173 174 mode = usb_get_dr_mode(dev); 175 176 if (mode == USB_DR_MODE_PERIPHERAL) 177 fotg210_udc_remove(pdev); 178 else 179 fotg210_hcd_remove(pdev); 180 } 181 182 #ifdef CONFIG_OF 183 static const struct of_device_id fotg210_of_match[] = { 184 { .compatible = "faraday,fotg200" }, 185 { .compatible = "faraday,fotg210" }, 186 /* TODO: can we also handle FUSB220? */ 187 {}, 188 }; 189 MODULE_DEVICE_TABLE(of, fotg210_of_match); 190 #endif 191 192 static struct platform_driver fotg210_driver = { 193 .driver = { 194 .name = "fotg210", 195 .of_match_table = of_match_ptr(fotg210_of_match), 196 }, 197 .probe = fotg210_probe, 198 .remove_new = fotg210_remove, 199 }; 200 201 static int __init fotg210_init(void) 202 { 203 if (IS_ENABLED(CONFIG_USB_FOTG210_HCD) && !usb_disabled()) 204 fotg210_hcd_init(); 205 return platform_driver_register(&fotg210_driver); 206 } 207 module_init(fotg210_init); 208 209 static void __exit fotg210_cleanup(void) 210 { 211 platform_driver_unregister(&fotg210_driver); 212 if (IS_ENABLED(CONFIG_USB_FOTG210_HCD)) 213 fotg210_hcd_cleanup(); 214 } 215 module_exit(fotg210_cleanup); 216 217 MODULE_AUTHOR("Yuan-Hsin Chen, Feng-Hsin Chiang"); 218 MODULE_LICENSE("GPL"); 219 MODULE_DESCRIPTION("FOTG210 Dual Role Controller Driver"); 220