1 /* 2 * SAMSUNG EXYNOS USB HOST EHCI Controller 3 * 4 * Copyright (C) 2011 Samsung Electronics Co.Ltd 5 * Author: Jingoo Han <jg1.han@samsung.com> 6 * Author: Joonyoung Shim <jy0922.shim@samsung.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 15 #include <linux/clk.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/io.h> 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/of.h> 21 #include <linux/of_gpio.h> 22 #include <linux/phy/phy.h> 23 #include <linux/platform_device.h> 24 #include <linux/usb.h> 25 #include <linux/usb/hcd.h> 26 27 #include "ehci.h" 28 29 #define DRIVER_DESC "EHCI EXYNOS driver" 30 31 #define EHCI_INSNREG00(base) (base + 0x90) 32 #define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25) 33 #define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24) 34 #define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23) 35 #define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22) 36 #define EHCI_INSNREG00_ENABLE_DMA_BURST \ 37 (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \ 38 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN) 39 40 static const char hcd_name[] = "ehci-exynos"; 41 static struct hc_driver __read_mostly exynos_ehci_hc_driver; 42 43 #define PHY_NUMBER 3 44 45 struct exynos_ehci_hcd { 46 struct clk *clk; 47 struct phy *phy[PHY_NUMBER]; 48 }; 49 50 #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv) 51 52 static int exynos_ehci_get_phy(struct device *dev, 53 struct exynos_ehci_hcd *exynos_ehci) 54 { 55 struct device_node *child; 56 struct phy *phy; 57 int phy_number; 58 int ret; 59 60 /* Get PHYs for the controller */ 61 for_each_available_child_of_node(dev->of_node, child) { 62 ret = of_property_read_u32(child, "reg", &phy_number); 63 if (ret) { 64 dev_err(dev, "Failed to parse device tree\n"); 65 of_node_put(child); 66 return ret; 67 } 68 69 if (phy_number >= PHY_NUMBER) { 70 dev_err(dev, "Invalid number of PHYs\n"); 71 of_node_put(child); 72 return -EINVAL; 73 } 74 75 phy = devm_of_phy_get(dev, child, NULL); 76 exynos_ehci->phy[phy_number] = phy; 77 if (IS_ERR(phy)) { 78 ret = PTR_ERR(phy); 79 if (ret == -EPROBE_DEFER) { 80 return ret; 81 } else if (ret != -ENOSYS && ret != -ENODEV) { 82 dev_err(dev, 83 "Error retrieving usb2 phy: %d\n", ret); 84 return ret; 85 } 86 } 87 } 88 89 return 0; 90 } 91 92 static int exynos_ehci_phy_enable(struct device *dev) 93 { 94 struct usb_hcd *hcd = dev_get_drvdata(dev); 95 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); 96 int i; 97 int ret = 0; 98 99 for (i = 0; ret == 0 && i < PHY_NUMBER; i++) 100 if (!IS_ERR(exynos_ehci->phy[i])) 101 ret = phy_power_on(exynos_ehci->phy[i]); 102 if (ret) 103 for (i--; i >= 0; i--) 104 if (!IS_ERR(exynos_ehci->phy[i])) 105 phy_power_off(exynos_ehci->phy[i]); 106 107 return ret; 108 } 109 110 static void exynos_ehci_phy_disable(struct device *dev) 111 { 112 struct usb_hcd *hcd = dev_get_drvdata(dev); 113 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); 114 int i; 115 116 for (i = 0; i < PHY_NUMBER; i++) 117 if (!IS_ERR(exynos_ehci->phy[i])) 118 phy_power_off(exynos_ehci->phy[i]); 119 } 120 121 static void exynos_setup_vbus_gpio(struct device *dev) 122 { 123 int err; 124 int gpio; 125 126 if (!dev->of_node) 127 return; 128 129 gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0); 130 if (!gpio_is_valid(gpio)) 131 return; 132 133 err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH, 134 "ehci_vbus_gpio"); 135 if (err) 136 dev_err(dev, "can't request ehci vbus gpio %d", gpio); 137 } 138 139 static int exynos_ehci_probe(struct platform_device *pdev) 140 { 141 struct exynos_ehci_hcd *exynos_ehci; 142 struct usb_hcd *hcd; 143 struct ehci_hcd *ehci; 144 struct resource *res; 145 int irq; 146 int err; 147 148 /* 149 * Right now device-tree probed devices don't get dma_mask set. 150 * Since shared usb code relies on it, set it here for now. 151 * Once we move to full device tree support this will vanish off. 152 */ 153 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 154 if (err) 155 return err; 156 157 exynos_setup_vbus_gpio(&pdev->dev); 158 159 hcd = usb_create_hcd(&exynos_ehci_hc_driver, 160 &pdev->dev, dev_name(&pdev->dev)); 161 if (!hcd) { 162 dev_err(&pdev->dev, "Unable to create HCD\n"); 163 return -ENOMEM; 164 } 165 exynos_ehci = to_exynos_ehci(hcd); 166 167 if (of_device_is_compatible(pdev->dev.of_node, 168 "samsung,exynos5440-ehci")) 169 goto skip_phy; 170 171 err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci); 172 if (err) 173 goto fail_clk; 174 175 skip_phy: 176 177 exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost"); 178 179 if (IS_ERR(exynos_ehci->clk)) { 180 dev_err(&pdev->dev, "Failed to get usbhost clock\n"); 181 err = PTR_ERR(exynos_ehci->clk); 182 goto fail_clk; 183 } 184 185 err = clk_prepare_enable(exynos_ehci->clk); 186 if (err) 187 goto fail_clk; 188 189 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 190 hcd->regs = devm_ioremap_resource(&pdev->dev, res); 191 if (IS_ERR(hcd->regs)) { 192 err = PTR_ERR(hcd->regs); 193 goto fail_io; 194 } 195 196 hcd->rsrc_start = res->start; 197 hcd->rsrc_len = resource_size(res); 198 199 irq = platform_get_irq(pdev, 0); 200 if (!irq) { 201 dev_err(&pdev->dev, "Failed to get IRQ\n"); 202 err = -ENODEV; 203 goto fail_io; 204 } 205 206 err = exynos_ehci_phy_enable(&pdev->dev); 207 if (err) { 208 dev_err(&pdev->dev, "Failed to enable USB phy\n"); 209 goto fail_io; 210 } 211 212 ehci = hcd_to_ehci(hcd); 213 ehci->caps = hcd->regs; 214 215 /* DMA burst Enable */ 216 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); 217 218 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 219 if (err) { 220 dev_err(&pdev->dev, "Failed to add USB HCD\n"); 221 goto fail_add_hcd; 222 } 223 device_wakeup_enable(hcd->self.controller); 224 225 platform_set_drvdata(pdev, hcd); 226 227 return 0; 228 229 fail_add_hcd: 230 exynos_ehci_phy_disable(&pdev->dev); 231 fail_io: 232 clk_disable_unprepare(exynos_ehci->clk); 233 fail_clk: 234 usb_put_hcd(hcd); 235 return err; 236 } 237 238 static int exynos_ehci_remove(struct platform_device *pdev) 239 { 240 struct usb_hcd *hcd = platform_get_drvdata(pdev); 241 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); 242 243 usb_remove_hcd(hcd); 244 245 exynos_ehci_phy_disable(&pdev->dev); 246 247 clk_disable_unprepare(exynos_ehci->clk); 248 249 usb_put_hcd(hcd); 250 251 return 0; 252 } 253 254 #ifdef CONFIG_PM 255 static int exynos_ehci_suspend(struct device *dev) 256 { 257 struct usb_hcd *hcd = dev_get_drvdata(dev); 258 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); 259 260 bool do_wakeup = device_may_wakeup(dev); 261 int rc; 262 263 rc = ehci_suspend(hcd, do_wakeup); 264 if (rc) 265 return rc; 266 267 exynos_ehci_phy_disable(dev); 268 269 clk_disable_unprepare(exynos_ehci->clk); 270 271 return rc; 272 } 273 274 static int exynos_ehci_resume(struct device *dev) 275 { 276 struct usb_hcd *hcd = dev_get_drvdata(dev); 277 struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); 278 int ret; 279 280 clk_prepare_enable(exynos_ehci->clk); 281 282 ret = exynos_ehci_phy_enable(dev); 283 if (ret) { 284 dev_err(dev, "Failed to enable USB phy\n"); 285 clk_disable_unprepare(exynos_ehci->clk); 286 return ret; 287 } 288 289 /* DMA burst Enable */ 290 writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); 291 292 ehci_resume(hcd, false); 293 return 0; 294 } 295 #else 296 #define exynos_ehci_suspend NULL 297 #define exynos_ehci_resume NULL 298 #endif 299 300 static const struct dev_pm_ops exynos_ehci_pm_ops = { 301 .suspend = exynos_ehci_suspend, 302 .resume = exynos_ehci_resume, 303 }; 304 305 #ifdef CONFIG_OF 306 static const struct of_device_id exynos_ehci_match[] = { 307 { .compatible = "samsung,exynos4210-ehci" }, 308 { .compatible = "samsung,exynos5440-ehci" }, 309 {}, 310 }; 311 MODULE_DEVICE_TABLE(of, exynos_ehci_match); 312 #endif 313 314 static struct platform_driver exynos_ehci_driver = { 315 .probe = exynos_ehci_probe, 316 .remove = exynos_ehci_remove, 317 .shutdown = usb_hcd_platform_shutdown, 318 .driver = { 319 .name = "exynos-ehci", 320 .pm = &exynos_ehci_pm_ops, 321 .of_match_table = of_match_ptr(exynos_ehci_match), 322 } 323 }; 324 static const struct ehci_driver_overrides exynos_overrides __initconst = { 325 .extra_priv_size = sizeof(struct exynos_ehci_hcd), 326 }; 327 328 static int __init ehci_exynos_init(void) 329 { 330 if (usb_disabled()) 331 return -ENODEV; 332 333 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 334 ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides); 335 return platform_driver_register(&exynos_ehci_driver); 336 } 337 module_init(ehci_exynos_init); 338 339 static void __exit ehci_exynos_cleanup(void) 340 { 341 platform_driver_unregister(&exynos_ehci_driver); 342 } 343 module_exit(ehci_exynos_cleanup); 344 345 MODULE_DESCRIPTION(DRIVER_DESC); 346 MODULE_ALIAS("platform:exynos-ehci"); 347 MODULE_AUTHOR("Jingoo Han"); 348 MODULE_AUTHOR("Joonyoung Shim"); 349 MODULE_LICENSE("GPL v2"); 350