drivers/usb/chipidea/host.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * host.c - ChipIdea USB host controller driver
   4  *
   5  * Copyright (c) 2012 Intel Corporation
   6  *
   7  * Author: Alexander Shishkin
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/io.h>
  12 #include <linux/usb.h>
  13 #include <linux/usb/hcd.h>
  14 #include <linux/usb/chipidea.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/pinctrl/consumer.h>
  17
  18 #include "../host/ehci.h"
  19
  20 #include "ci.h"
  21 #include "bits.h"
  22 #include "host.h"
  23
  24 static struct hc_driver __read_mostly ci_ehci_hc_driver;
  25 static int (*orig_bus_suspend)(struct usb_hcd *hcd);
  26
  27 struct ehci_ci_priv {
  28         struct regulator *reg_vbus;
  29         bool enabled;
  30 };
  31
  32 struct ci_hdrc_dma_aligned_buffer {
  33         void *kmalloc_ptr;
  34         void *old_xfer_buffer;
  35         u8 data[];
  36 };
  37
  38 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
  39 {
  40         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  41         struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
  42         struct device *dev = hcd->self.controller;
  43         struct ci_hdrc *ci = dev_get_drvdata(dev);
  44         int ret = 0;
  45         int port = HCS_N_PORTS(ehci->hcs_params);
  46
  47         if (priv->reg_vbus && enable != priv->enabled) {
  48                 if (port > 1) {
  49                         dev_warn(dev,
  50                                 "Not support multi-port regulator control\n");
  51                         return 0;
  52                 }
  53                 if (enable)
  54                         ret = regulator_enable(priv->reg_vbus);
  55                 else
  56                         ret = regulator_disable(priv->reg_vbus);
  57                 if (ret) {
  58                         dev_err(dev,
  59                                 "Failed to %s vbus regulator, ret=%d\n",
  60                                 enable ? "enable" : "disable", ret);
  61                         return ret;
  62                 }
  63                 priv->enabled = enable;
  64         }
  65
  66         if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL) {
  67                 if (enable)
  68                         usb_phy_vbus_on(ci->usb_phy);
  69                 else
  70                         usb_phy_vbus_off(ci->usb_phy);
  71         }
  72
  73         if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
  74                 /*
  75                  * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
  76                  * As HSIC is always HS, this should be safe for others.
  77                  */
  78                 hw_port_test_set(ci, 5);
  79                 hw_port_test_set(ci, 0);
  80         }
  81         return 0;
  82 };
  83
  84 static int ehci_ci_reset(struct usb_hcd *hcd)
  85 {
  86         struct device *dev = hcd->self.controller;
  87         struct ci_hdrc *ci = dev_get_drvdata(dev);
  88         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  89         int ret;
  90
  91         ret = ehci_setup(hcd);
  92         if (ret)
  93                 return ret;
  94
  95         ehci->need_io_watchdog = 0;
  96
  97         if (ci->platdata->notify_event) {
  98                 ret = ci->platdata->notify_event(ci,
  99                                 CI_HDRC_CONTROLLER_RESET_EVENT);
 100                 if (ret)
 101                         return ret;
 102         }
 103
 104         ci_platform_configure(ci);
 105
 106         return ret;
 107 }
 108
 109 static const struct ehci_driver_overrides ehci_ci_overrides = {
 110         .extra_priv_size = sizeof(struct ehci_ci_priv),
 111         .port_power      = ehci_ci_portpower,
 112         .reset           = ehci_ci_reset,
 113 };
 114
 115 static irqreturn_t host_irq(struct ci_hdrc *ci)
 116 {
 117         return usb_hcd_irq(ci->irq, ci->hcd);
 118 }
 119
 120 static int host_start(struct ci_hdrc *ci)
 121 {
 122         struct usb_hcd *hcd;
 123         struct ehci_hcd *ehci;
 124         struct ehci_ci_priv *priv;
 125         int ret;
 126
 127         if (usb_disabled())
 128                 return -ENODEV;
 129
 130         hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
 131                                ci->dev, dev_name(ci->dev), NULL);
 132         if (!hcd)
 133                 return -ENOMEM;
 134
 135         dev_set_drvdata(ci->dev, ci);
 136         hcd->rsrc_start = ci->hw_bank.phys;
 137         hcd->rsrc_len = ci->hw_bank.size;
 138         hcd->regs = ci->hw_bank.abs;
 139         hcd->has_tt = 1;
 140
 141         hcd->power_budget = ci->platdata->power_budget;
 142         hcd->tpl_support = ci->platdata->tpl_support;
 143         if (ci->phy || ci->usb_phy) {
 144                 hcd->skip_phy_initialization = 1;
 145                 if (ci->usb_phy)
 146                         hcd->usb_phy = ci->usb_phy;
 147         }
 148
 149         ehci = hcd_to_ehci(hcd);
 150         ehci->caps = ci->hw_bank.cap;
 151         ehci->has_hostpc = ci->hw_bank.lpm;
 152         ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 153         ehci->imx28_write_fix = ci->imx28_write_fix;
 154
 155         priv = (struct ehci_ci_priv *)ehci->priv;
 156         priv->reg_vbus = NULL;
 157
 158         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
 159                 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
 160                         ret = regulator_enable(ci->platdata->reg_vbus);
 161                         if (ret) {
 162                                 dev_err(ci->dev,
 163                                 "Failed to enable vbus regulator, ret=%d\n",
 164                                                                         ret);
 165                                 goto put_hcd;
 166                         }
 167                 } else {
 168                         priv->reg_vbus = ci->platdata->reg_vbus;
 169                 }
 170         }
 171
 172         if (ci->platdata->pins_host)
 173                 pinctrl_select_state(ci->platdata->pctl,
 174                                      ci->platdata->pins_host);
 175
 176         ci->hcd = hcd;
 177
 178         ret = usb_add_hcd(hcd, 0, 0);
 179         if (ret) {
 180                 ci->hcd = NULL;
 181                 goto disable_reg;
 182         } else {
 183                 struct usb_otg *otg = &ci->otg;
 184
 185                 if (ci_otg_is_fsm_mode(ci)) {
 186                         otg->host = &hcd->self;
 187                         hcd->self.otg_port = 1;
 188                 }
 189
 190                 if (ci->platdata->notify_event &&
 191                         (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC))
 192                         ci->platdata->notify_event
 193                                 (ci, CI_HDRC_IMX_HSIC_ACTIVE_EVENT);
 194         }
 195
 196         return ret;
 197
 198 disable_reg:
 199         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 200                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 201                 regulator_disable(ci->platdata->reg_vbus);
 202 put_hcd:
 203         usb_put_hcd(hcd);
 204
 205         return ret;
 206 }
 207
 208 static void host_stop(struct ci_hdrc *ci)
 209 {
 210         struct usb_hcd *hcd = ci->hcd;
 211
 212         if (hcd) {
 213                 if (ci->platdata->notify_event)
 214                         ci->platdata->notify_event(ci,
 215                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
 216                 usb_remove_hcd(hcd);
 217                 ci->role = CI_ROLE_END;
 218                 synchronize_irq(ci->irq);
 219                 usb_put_hcd(hcd);
 220                 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 221                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 222                                 regulator_disable(ci->platdata->reg_vbus);
 223         }
 224         ci->hcd = NULL;
 225         ci->otg.host = NULL;
 226
 227         if (ci->platdata->pins_host && ci->platdata->pins_default)
 228                 pinctrl_select_state(ci->platdata->pctl,
 229                                      ci->platdata->pins_default);
 230 }
 231
 232
 233 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 234 {
 235         if (ci->role == CI_ROLE_HOST && ci->hcd)
 236                 host_stop(ci);
 237 }
 238
 239 /* The below code is based on tegra ehci driver */
 240 static int ci_ehci_hub_control(
 241         struct usb_hcd  *hcd,
 242         u16             typeReq,
 243         u16             wValue,
 244         u16             wIndex,
 245         char            *buf,
 246         u16             wLength
 247 )
 248 {
 249         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 250         unsigned int    ports = HCS_N_PORTS(ehci->hcs_params);
 251         u32 __iomem     *status_reg;
 252         u32             temp, port_index;
 253         unsigned long   flags;
 254         int             retval = 0;
 255         bool            done = false;
 256         struct device *dev = hcd->self.controller;
 257         struct ci_hdrc *ci = dev_get_drvdata(dev);
 258
 259         port_index = wIndex & 0xff;
 260         port_index -= (port_index > 0);
 261         status_reg = &ehci->regs->port_status[port_index];
 262
 263         spin_lock_irqsave(&ehci->lock, flags);
 264
 265         if (ci->platdata->hub_control) {
 266                 retval = ci->platdata->hub_control(ci, typeReq, wValue, wIndex,
 267                                                    buf, wLength, &done, &flags);
 268                 if (done)
 269                         goto done;
 270         }
 271
 272         if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
 273                 if (!wIndex || wIndex > ports) {
 274                         retval = -EPIPE;
 275                         goto done;
 276                 }
 277
 278                 temp = ehci_readl(ehci, status_reg);
 279                 if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
 280                         retval = -EPIPE;
 281                         goto done;
 282                 }
 283
 284                 temp &= ~(PORT_RWC_BITS | PORT_WKCONN_E);
 285                 temp |= PORT_WKDISC_E | PORT_WKOC_E;
 286                 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 287
 288                 /*
 289                  * If a transaction is in progress, there may be a delay in
 290                  * suspending the port. Poll until the port is suspended.
 291                  */
 292                 if (ehci_handshake(ehci, status_reg, PORT_SUSPEND,
 293                         PORT_SUSPEND, 5000))
 294                         ehci_err(ehci, "timeout waiting for SUSPEND\n");
 295
 296                 if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
 297                         if (ci->platdata->notify_event)
 298                                 ci->platdata->notify_event(ci,
 299                                         CI_HDRC_IMX_HSIC_SUSPEND_EVENT);
 300
 301                         temp = ehci_readl(ehci, status_reg);
 302                         temp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
 303                         ehci_writel(ehci, temp, status_reg);
 304                 }
 305
 306                 set_bit(port_index, &ehci->suspended_ports);
 307                 goto done;
 308         }
 309
 310         /*
 311          * After resume has finished, it needs do some post resume
 312          * operation for some SoCs.
 313          */
 314         else if (typeReq == ClearPortFeature &&
 315                 wValue == USB_PORT_FEAT_C_SUSPEND) {
 316                 /* Make sure the resume has finished, it should be finished */
 317                 if (ehci_handshake(ehci, status_reg, PORT_RESUME, 0, 25000))
 318                         ehci_err(ehci, "timeout waiting for resume\n");
 319         }
 320
 321         spin_unlock_irqrestore(&ehci->lock, flags);
 322
 323         /* Handle the hub control events here */
 324         return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
 325 done:
 326         spin_unlock_irqrestore(&ehci->lock, flags);
 327         return retval;
 328 }
 329 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
 330 {
 331         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 332         struct device *dev = hcd->self.controller;
 333         struct ci_hdrc *ci = dev_get_drvdata(dev);
 334         int port;
 335         u32 tmp;
 336
 337         int ret = orig_bus_suspend(hcd);
 338
 339         if (ret)
 340                 return ret;
 341
 342         port = HCS_N_PORTS(ehci->hcs_params);
 343         while (port--) {
 344                 u32 __iomem *reg = &ehci->regs->port_status[port];
 345                 u32 portsc = ehci_readl(ehci, reg);
 346
 347                 if (portsc & PORT_CONNECT) {
 348                         /*
 349                          * For chipidea, the resume signal will be ended
 350                          * automatically, so for remote wakeup case, the
 351                          * usbcmd.rs may not be set before the resume has
 352                          * ended if other resume paths consumes too much
 353                          * time (~24ms), in that case, the SOF will not
 354                          * send out within 3ms after resume ends, then the
 355                          * high speed device will enter full speed mode.
 356                          */
 357
 358                         tmp = ehci_readl(ehci, &ehci->regs->command);
 359                         tmp |= CMD_RUN;
 360                         ehci_writel(ehci, tmp, &ehci->regs->command);
 361                         /*
 362                          * It needs a short delay between set RS bit and PHCD.
 363                          */
 364                         usleep_range(150, 200);
 365                         /*
 366                          * Need to clear WKCN and WKOC for imx HSIC,
 367                          * otherwise, there will be wakeup event.
 368                          */
 369                         if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
 370                                 tmp = ehci_readl(ehci, reg);
 371                                 tmp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
 372                                 ehci_writel(ehci, tmp, reg);
 373                         }
 374
 375                         break;
 376                 }
 377         }
 378
 379         return 0;
 380 }
 381
 382 static void ci_hdrc_free_dma_aligned_buffer(struct urb *urb)
 383 {
 384         struct ci_hdrc_dma_aligned_buffer *temp;
 385         size_t length;
 386
 387         if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
 388                 return;
 389
 390         temp = container_of(urb->transfer_buffer,
 391                             struct ci_hdrc_dma_aligned_buffer, data);
 392
 393         if (usb_urb_dir_in(urb)) {
 394                 if (usb_pipeisoc(urb->pipe))
 395                         length = urb->transfer_buffer_length;
 396                 else
 397                         length = urb->actual_length;
 398
 399                 memcpy(temp->old_xfer_buffer, temp->data, length);
 400         }
 401         urb->transfer_buffer = temp->old_xfer_buffer;
 402         kfree(temp->kmalloc_ptr);
 403
 404         urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
 405 }
 406
 407 static int ci_hdrc_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
 408 {
 409         struct ci_hdrc_dma_aligned_buffer *temp, *kmalloc_ptr;
 410         const unsigned int ci_hdrc_usb_dma_align = 32;
 411         size_t kmalloc_size;
 412
 413         if (urb->num_sgs || urb->sg || urb->transfer_buffer_length == 0 ||
 414             !((uintptr_t)urb->transfer_buffer & (ci_hdrc_usb_dma_align - 1)))
 415                 return 0;
 416
 417         /* Allocate a buffer with enough padding for alignment */
 418         kmalloc_size = urb->transfer_buffer_length +
 419                        sizeof(struct ci_hdrc_dma_aligned_buffer) +
 420                        ci_hdrc_usb_dma_align - 1;
 421
 422         kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
 423         if (!kmalloc_ptr)
 424                 return -ENOMEM;
 425
 426         /* Position our struct dma_aligned_buffer such that data is aligned */
 427         temp = PTR_ALIGN(kmalloc_ptr + 1, ci_hdrc_usb_dma_align) - 1;
 428         temp->kmalloc_ptr = kmalloc_ptr;
 429         temp->old_xfer_buffer = urb->transfer_buffer;
 430         if (usb_urb_dir_out(urb))
 431                 memcpy(temp->data, urb->transfer_buffer,
 432                        urb->transfer_buffer_length);
 433         urb->transfer_buffer = temp->data;
 434
 435         urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
 436
 437         return 0;
 438 }
 439
 440 static int ci_hdrc_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 441                                    gfp_t mem_flags)
 442 {
 443         int ret;
 444
 445         ret = ci_hdrc_alloc_dma_aligned_buffer(urb, mem_flags);
 446         if (ret)
 447                 return ret;
 448
 449         ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
 450         if (ret)
 451                 ci_hdrc_free_dma_aligned_buffer(urb);
 452
 453         return ret;
 454 }
 455
 456 static void ci_hdrc_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
 457 {
 458         usb_hcd_unmap_urb_for_dma(hcd, urb);
 459         ci_hdrc_free_dma_aligned_buffer(urb);
 460 }
 461
 462 #ifdef CONFIG_PM_SLEEP
 463 static void ci_hdrc_host_suspend(struct ci_hdrc *ci)
 464 {
 465         ehci_suspend(ci->hcd, device_may_wakeup(ci->dev));
 466 }
 467
 468 static void ci_hdrc_host_resume(struct ci_hdrc *ci, bool power_lost)
 469 {
 470         ehci_resume(ci->hcd, power_lost);
 471 }
 472 #endif
 473
 474 int ci_hdrc_host_init(struct ci_hdrc *ci)
 475 {
 476         struct ci_role_driver *rdrv;
 477
 478         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 479                 return -ENXIO;
 480
 481         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 482         if (!rdrv)
 483                 return -ENOMEM;
 484
 485         rdrv->start     = host_start;
 486         rdrv->stop      = host_stop;
 487 #ifdef CONFIG_PM_SLEEP
 488         rdrv->suspend   = ci_hdrc_host_suspend;
 489         rdrv->resume    = ci_hdrc_host_resume;
 490 #endif
 491         rdrv->irq       = host_irq;
 492         rdrv->name      = "host";
 493         ci->roles[CI_ROLE_HOST] = rdrv;
 494
 495         if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA) {
 496                 ci_ehci_hc_driver.map_urb_for_dma = ci_hdrc_map_urb_for_dma;
 497                 ci_ehci_hc_driver.unmap_urb_for_dma = ci_hdrc_unmap_urb_for_dma;
 498         }
 499
 500         return 0;
 501 }
 502
 503 void ci_hdrc_host_driver_init(void)
 504 {
 505         ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
 506         orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
 507         ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
 508         ci_ehci_hc_driver.hub_control = ci_ehci_hub_control;
 509 }