1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * xHCI host controller driver for HiSilicon STB SoCs 4 * 5 * Copyright (C) 2017-2018 HiSilicon Co., Ltd. http://www.hisilicon.com 6 * 7 * Authors: Jianguo Sun <sunjianguo1@huawei.com> 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/dma-mapping.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/platform_device.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/reset.h> 18 19 #include "xhci.h" 20 21 #define GTXTHRCFG 0xc108 22 #define GRXTHRCFG 0xc10c 23 #define REG_GUSB2PHYCFG0 0xc200 24 #define BIT_UTMI_8_16 BIT(3) 25 #define BIT_UTMI_ULPI BIT(4) 26 #define BIT_FREECLK_EXIST BIT(30) 27 28 #define REG_GUSB3PIPECTL0 0xc2c0 29 #define USB3_DEEMPHASIS_MASK GENMASK(2, 1) 30 #define USB3_DEEMPHASIS0 BIT(1) 31 #define USB3_TX_MARGIN1 BIT(4) 32 33 struct xhci_hcd_histb { 34 struct device *dev; 35 struct usb_hcd *hcd; 36 void __iomem *ctrl; 37 struct clk *bus_clk; 38 struct clk *utmi_clk; 39 struct clk *pipe_clk; 40 struct clk *suspend_clk; 41 struct reset_control *soft_reset; 42 }; 43 44 static inline struct xhci_hcd_histb *hcd_to_histb(struct usb_hcd *hcd) 45 { 46 return dev_get_drvdata(hcd->self.controller); 47 } 48 49 static int xhci_histb_config(struct xhci_hcd_histb *histb) 50 { 51 struct device_node *np = histb->dev->of_node; 52 u32 regval; 53 54 if (of_property_match_string(np, "phys-names", "inno") >= 0) { 55 /* USB2 PHY chose ulpi 8bit interface */ 56 regval = readl(histb->ctrl + REG_GUSB2PHYCFG0); 57 regval &= ~BIT_UTMI_ULPI; 58 regval &= ~(BIT_UTMI_8_16); 59 regval &= ~BIT_FREECLK_EXIST; 60 writel(regval, histb->ctrl + REG_GUSB2PHYCFG0); 61 } 62 63 if (of_property_match_string(np, "phys-names", "combo") >= 0) { 64 /* 65 * write 0x010c0012 to GUSB3PIPECTL0 66 * GUSB3PIPECTL0[5:3] = 010 : Tx Margin = 900mV , 67 * decrease TX voltage 68 * GUSB3PIPECTL0[2:1] = 01 : Tx Deemphasis = -3.5dB, 69 * refer to xHCI spec 70 */ 71 regval = readl(histb->ctrl + REG_GUSB3PIPECTL0); 72 regval &= ~USB3_DEEMPHASIS_MASK; 73 regval |= USB3_DEEMPHASIS0; 74 regval |= USB3_TX_MARGIN1; 75 writel(regval, histb->ctrl + REG_GUSB3PIPECTL0); 76 } 77 78 writel(0x23100000, histb->ctrl + GTXTHRCFG); 79 writel(0x23100000, histb->ctrl + GRXTHRCFG); 80 81 return 0; 82 } 83 84 static int xhci_histb_clks_get(struct xhci_hcd_histb *histb) 85 { 86 struct device *dev = histb->dev; 87 88 histb->bus_clk = devm_clk_get(dev, "bus"); 89 if (IS_ERR(histb->bus_clk)) { 90 dev_err(dev, "fail to get bus clk\n"); 91 return PTR_ERR(histb->bus_clk); 92 } 93 94 histb->utmi_clk = devm_clk_get(dev, "utmi"); 95 if (IS_ERR(histb->utmi_clk)) { 96 dev_err(dev, "fail to get utmi clk\n"); 97 return PTR_ERR(histb->utmi_clk); 98 } 99 100 histb->pipe_clk = devm_clk_get(dev, "pipe"); 101 if (IS_ERR(histb->pipe_clk)) { 102 dev_err(dev, "fail to get pipe clk\n"); 103 return PTR_ERR(histb->pipe_clk); 104 } 105 106 histb->suspend_clk = devm_clk_get(dev, "suspend"); 107 if (IS_ERR(histb->suspend_clk)) { 108 dev_err(dev, "fail to get suspend clk\n"); 109 return PTR_ERR(histb->suspend_clk); 110 } 111 112 return 0; 113 } 114 115 static int xhci_histb_host_enable(struct xhci_hcd_histb *histb) 116 { 117 int ret; 118 119 ret = clk_prepare_enable(histb->bus_clk); 120 if (ret) { 121 dev_err(histb->dev, "failed to enable bus clk\n"); 122 return ret; 123 } 124 125 ret = clk_prepare_enable(histb->utmi_clk); 126 if (ret) { 127 dev_err(histb->dev, "failed to enable utmi clk\n"); 128 goto err_utmi_clk; 129 } 130 131 ret = clk_prepare_enable(histb->pipe_clk); 132 if (ret) { 133 dev_err(histb->dev, "failed to enable pipe clk\n"); 134 goto err_pipe_clk; 135 } 136 137 ret = clk_prepare_enable(histb->suspend_clk); 138 if (ret) { 139 dev_err(histb->dev, "failed to enable suspend clk\n"); 140 goto err_suspend_clk; 141 } 142 143 reset_control_deassert(histb->soft_reset); 144 145 return 0; 146 147 err_suspend_clk: 148 clk_disable_unprepare(histb->pipe_clk); 149 err_pipe_clk: 150 clk_disable_unprepare(histb->utmi_clk); 151 err_utmi_clk: 152 clk_disable_unprepare(histb->bus_clk); 153 154 return ret; 155 } 156 157 static void xhci_histb_host_disable(struct xhci_hcd_histb *histb) 158 { 159 reset_control_assert(histb->soft_reset); 160 161 clk_disable_unprepare(histb->suspend_clk); 162 clk_disable_unprepare(histb->pipe_clk); 163 clk_disable_unprepare(histb->utmi_clk); 164 clk_disable_unprepare(histb->bus_clk); 165 } 166 167 static void xhci_histb_quirks(struct device *dev, struct xhci_hcd *xhci) 168 { 169 /* 170 * As of now platform drivers don't provide MSI support so we ensure 171 * here that the generic code does not try to make a pci_dev from our 172 * dev struct in order to setup MSI 173 */ 174 xhci->quirks |= XHCI_PLAT; 175 } 176 177 /* called during probe() after chip reset completes */ 178 static int xhci_histb_setup(struct usb_hcd *hcd) 179 { 180 struct xhci_hcd_histb *histb = hcd_to_histb(hcd); 181 int ret; 182 183 if (usb_hcd_is_primary_hcd(hcd)) { 184 ret = xhci_histb_config(histb); 185 if (ret) 186 return ret; 187 } 188 189 return xhci_gen_setup(hcd, xhci_histb_quirks); 190 } 191 192 static const struct xhci_driver_overrides xhci_histb_overrides __initconst = { 193 .reset = xhci_histb_setup, 194 }; 195 196 static struct hc_driver __read_mostly xhci_histb_hc_driver; 197 static int xhci_histb_probe(struct platform_device *pdev) 198 { 199 struct device *dev = &pdev->dev; 200 struct xhci_hcd_histb *histb; 201 const struct hc_driver *driver; 202 struct usb_hcd *hcd; 203 struct xhci_hcd *xhci; 204 struct resource *res; 205 int irq; 206 int ret = -ENODEV; 207 208 if (usb_disabled()) 209 return -ENODEV; 210 211 driver = &xhci_histb_hc_driver; 212 histb = devm_kzalloc(dev, sizeof(*histb), GFP_KERNEL); 213 if (!histb) 214 return -ENOMEM; 215 216 histb->dev = dev; 217 218 irq = platform_get_irq(pdev, 0); 219 if (irq < 0) 220 return irq; 221 222 histb->ctrl = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 223 if (IS_ERR(histb->ctrl)) 224 return PTR_ERR(histb->ctrl); 225 226 ret = xhci_histb_clks_get(histb); 227 if (ret) 228 return ret; 229 230 histb->soft_reset = devm_reset_control_get(dev, "soft"); 231 if (IS_ERR(histb->soft_reset)) { 232 dev_err(dev, "failed to get soft reset\n"); 233 return PTR_ERR(histb->soft_reset); 234 } 235 236 pm_runtime_enable(dev); 237 pm_runtime_get_sync(dev); 238 device_enable_async_suspend(dev); 239 240 /* Initialize dma_mask and coherent_dma_mask to 32-bits */ 241 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); 242 if (ret) 243 goto disable_pm; 244 245 hcd = usb_create_hcd(driver, dev, dev_name(dev)); 246 if (!hcd) { 247 ret = -ENOMEM; 248 goto disable_pm; 249 } 250 251 hcd->regs = histb->ctrl; 252 hcd->rsrc_start = res->start; 253 hcd->rsrc_len = resource_size(res); 254 255 histb->hcd = hcd; 256 dev_set_drvdata(hcd->self.controller, histb); 257 258 ret = xhci_histb_host_enable(histb); 259 if (ret) 260 goto put_hcd; 261 262 xhci = hcd_to_xhci(hcd); 263 264 device_wakeup_enable(hcd->self.controller); 265 266 xhci->main_hcd = hcd; 267 xhci->shared_hcd = usb_create_shared_hcd(driver, dev, dev_name(dev), 268 hcd); 269 if (!xhci->shared_hcd) { 270 ret = -ENOMEM; 271 goto disable_host; 272 } 273 274 if (device_property_read_bool(dev, "usb2-lpm-disable")) 275 xhci->quirks |= XHCI_HW_LPM_DISABLE; 276 277 if (device_property_read_bool(dev, "usb3-lpm-capable")) 278 xhci->quirks |= XHCI_LPM_SUPPORT; 279 280 /* imod_interval is the interrupt moderation value in nanoseconds. */ 281 xhci->imod_interval = 40000; 282 device_property_read_u32(dev, "imod-interval-ns", 283 &xhci->imod_interval); 284 285 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 286 if (ret) 287 goto put_usb3_hcd; 288 289 if (HCC_MAX_PSA(xhci->hcc_params) >= 4) 290 xhci->shared_hcd->can_do_streams = 1; 291 292 ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED); 293 if (ret) 294 goto dealloc_usb2_hcd; 295 296 device_enable_async_suspend(dev); 297 pm_runtime_put_noidle(dev); 298 299 /* 300 * Prevent runtime pm from being on as default, users should enable 301 * runtime pm using power/control in sysfs. 302 */ 303 pm_runtime_forbid(dev); 304 305 return 0; 306 307 dealloc_usb2_hcd: 308 usb_remove_hcd(hcd); 309 put_usb3_hcd: 310 usb_put_hcd(xhci->shared_hcd); 311 disable_host: 312 xhci_histb_host_disable(histb); 313 put_hcd: 314 usb_put_hcd(hcd); 315 disable_pm: 316 pm_runtime_put_sync(dev); 317 pm_runtime_disable(dev); 318 319 return ret; 320 } 321 322 static int xhci_histb_remove(struct platform_device *dev) 323 { 324 struct xhci_hcd_histb *histb = platform_get_drvdata(dev); 325 struct usb_hcd *hcd = histb->hcd; 326 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 327 struct usb_hcd *shared_hcd = xhci->shared_hcd; 328 329 xhci->xhc_state |= XHCI_STATE_REMOVING; 330 331 usb_remove_hcd(shared_hcd); 332 xhci->shared_hcd = NULL; 333 device_wakeup_disable(&dev->dev); 334 335 usb_remove_hcd(hcd); 336 usb_put_hcd(shared_hcd); 337 338 xhci_histb_host_disable(histb); 339 usb_put_hcd(hcd); 340 pm_runtime_put_sync(&dev->dev); 341 pm_runtime_disable(&dev->dev); 342 343 return 0; 344 } 345 346 static int __maybe_unused xhci_histb_suspend(struct device *dev) 347 { 348 struct xhci_hcd_histb *histb = dev_get_drvdata(dev); 349 struct usb_hcd *hcd = histb->hcd; 350 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 351 int ret; 352 353 ret = xhci_suspend(xhci, device_may_wakeup(dev)); 354 355 if (!device_may_wakeup(dev)) 356 xhci_histb_host_disable(histb); 357 358 return ret; 359 } 360 361 static int __maybe_unused xhci_histb_resume(struct device *dev) 362 { 363 struct xhci_hcd_histb *histb = dev_get_drvdata(dev); 364 struct usb_hcd *hcd = histb->hcd; 365 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 366 367 if (!device_may_wakeup(dev)) 368 xhci_histb_host_enable(histb); 369 370 return xhci_resume(xhci, 0); 371 } 372 373 static const struct dev_pm_ops xhci_histb_pm_ops = { 374 SET_SYSTEM_SLEEP_PM_OPS(xhci_histb_suspend, xhci_histb_resume) 375 }; 376 #define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &xhci_histb_pm_ops : NULL) 377 378 #ifdef CONFIG_OF 379 static const struct of_device_id histb_xhci_of_match[] = { 380 { .compatible = "hisilicon,hi3798cv200-xhci"}, 381 { }, 382 }; 383 MODULE_DEVICE_TABLE(of, histb_xhci_of_match); 384 #endif 385 386 static struct platform_driver histb_xhci_driver = { 387 .probe = xhci_histb_probe, 388 .remove = xhci_histb_remove, 389 .driver = { 390 .name = "xhci-histb", 391 .pm = DEV_PM_OPS, 392 .of_match_table = of_match_ptr(histb_xhci_of_match), 393 }, 394 }; 395 MODULE_ALIAS("platform:xhci-histb"); 396 397 static int __init xhci_histb_init(void) 398 { 399 xhci_init_driver(&xhci_histb_hc_driver, &xhci_histb_overrides); 400 return platform_driver_register(&histb_xhci_driver); 401 } 402 module_init(xhci_histb_init); 403 404 static void __exit xhci_histb_exit(void) 405 { 406 platform_driver_unregister(&histb_xhci_driver); 407 } 408 module_exit(xhci_histb_exit); 409 410 MODULE_DESCRIPTION("HiSilicon STB xHCI Host Controller Driver"); 411 MODULE_LICENSE("GPL v2"); 412