drivers/usb/host/ehci-tegra.c

   1 /*
   2  * EHCI-compliant USB host controller driver for NVIDIA Tegra SoCs
   3  *
   4  * Copyright (C) 2010 Google, Inc.
   5  * Copyright (C) 2009 - 2013 NVIDIA Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  */
  18
  19 #include <linux/clk.h>
  20 #include <linux/clk/tegra.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/err.h>
  23 #include <linux/gpio.h>
  24 #include <linux/io.h>
  25 #include <linux/irq.h>
  26 #include <linux/module.h>
  27 #include <linux/of.h>
  28 #include <linux/of_device.h>
  29 #include <linux/of_gpio.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/pm_runtime.h>
  32 #include <linux/slab.h>
  33 #include <linux/usb/ehci_def.h>
  34 #include <linux/usb/tegra_usb_phy.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/hcd.h>
  37 #include <linux/usb/otg.h>
  38
  39 #include "ehci.h"
  40
  41 #define TEGRA_USB_BASE                  0xC5000000
  42 #define TEGRA_USB2_BASE                 0xC5004000
  43 #define TEGRA_USB3_BASE                 0xC5008000
  44
  45 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  46
  47 #define TEGRA_USB_DMA_ALIGN 32
  48
  49 #define DRIVER_DESC "Tegra EHCI driver"
  50 #define DRV_NAME "tegra-ehci"
  51
  52 static struct hc_driver __read_mostly tegra_ehci_hc_driver;
  53
  54 struct tegra_ehci_soc_config {
  55         bool has_hostpc;
  56 };
  57
  58 static int (*orig_hub_control)(struct usb_hcd *hcd,
  59                                 u16 typeReq, u16 wValue, u16 wIndex,
  60                                 char *buf, u16 wLength);
  61
  62 struct tegra_ehci_hcd {
  63         struct tegra_usb_phy *phy;
  64         struct clk *clk;
  65         int port_resuming;
  66         bool needs_double_reset;
  67         enum tegra_usb_phy_port_speed port_speed;
  68 };
  69
  70 static int tegra_ehci_internal_port_reset(
  71         struct ehci_hcd *ehci,
  72         u32 __iomem     *portsc_reg
  73 )
  74 {
  75         u32             temp;
  76         unsigned long   flags;
  77         int             retval = 0;
  78         int             i, tries;
  79         u32             saved_usbintr;
  80
  81         spin_lock_irqsave(&ehci->lock, flags);
  82         saved_usbintr = ehci_readl(ehci, &ehci->regs->intr_enable);
  83         /* disable USB interrupt */
  84         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
  85         spin_unlock_irqrestore(&ehci->lock, flags);
  86
  87         /*
  88          * Here we have to do Port Reset at most twice for
  89          * Port Enable bit to be set.
  90          */
  91         for (i = 0; i < 2; i++) {
  92                 temp = ehci_readl(ehci, portsc_reg);
  93                 temp |= PORT_RESET;
  94                 ehci_writel(ehci, temp, portsc_reg);
  95                 mdelay(10);
  96                 temp &= ~PORT_RESET;
  97                 ehci_writel(ehci, temp, portsc_reg);
  98                 mdelay(1);
  99                 tries = 100;
 100                 do {
 101                         mdelay(1);
 102                         /*
 103                          * Up to this point, Port Enable bit is
 104                          * expected to be set after 2 ms waiting.
 105                          * USB1 usually takes extra 45 ms, for safety,
 106                          * we take 100 ms as timeout.
 107                          */
 108                         temp = ehci_readl(ehci, portsc_reg);
 109                 } while (!(temp & PORT_PE) && tries--);
 110                 if (temp & PORT_PE)
 111                         break;
 112         }
 113         if (i == 2)
 114                 retval = -ETIMEDOUT;
 115
 116         /*
 117          * Clear Connect Status Change bit if it's set.
 118          * We can't clear PORT_PEC. It will also cause PORT_PE to be cleared.
 119          */
 120         if (temp & PORT_CSC)
 121                 ehci_writel(ehci, PORT_CSC, portsc_reg);
 122
 123         /*
 124          * Write to clear any interrupt status bits that might be set
 125          * during port reset.
 126          */
 127         temp = ehci_readl(ehci, &ehci->regs->status);
 128         ehci_writel(ehci, temp, &ehci->regs->status);
 129
 130         /* restore original interrupt enable bits */
 131         ehci_writel(ehci, saved_usbintr, &ehci->regs->intr_enable);
 132         return retval;
 133 }
 134
 135 static int tegra_ehci_hub_control(
 136         struct usb_hcd  *hcd,
 137         u16             typeReq,
 138         u16             wValue,
 139         u16             wIndex,
 140         char            *buf,
 141         u16             wLength
 142 )
 143 {
 144         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 145         struct tegra_ehci_hcd *tegra = (struct tegra_ehci_hcd *)ehci->priv;
 146         u32 __iomem     *status_reg;
 147         u32             temp;
 148         unsigned long   flags;
 149         int             retval = 0;
 150
 151         status_reg = &ehci->regs->port_status[(wIndex & 0xff) - 1];
 152
 153         spin_lock_irqsave(&ehci->lock, flags);
 154
 155         if (typeReq == GetPortStatus) {
 156                 temp = ehci_readl(ehci, status_reg);
 157                 if (tegra->port_resuming && !(temp & PORT_SUSPEND)) {
 158                         /* Resume completed, re-enable disconnect detection */
 159                         tegra->port_resuming = 0;
 160                         tegra_usb_phy_postresume(hcd->phy);
 161                 }
 162         }
 163
 164         else if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
 165                 temp = ehci_readl(ehci, status_reg);
 166                 if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
 167                         retval = -EPIPE;
 168                         goto done;
 169                 }
 170
 171                 temp &= ~(PORT_RWC_BITS | PORT_WKCONN_E);
 172                 temp |= PORT_WKDISC_E | PORT_WKOC_E;
 173                 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 174
 175                 /*
 176                  * If a transaction is in progress, there may be a delay in
 177                  * suspending the port. Poll until the port is suspended.
 178                  */
 179                 if (ehci_handshake(ehci, status_reg, PORT_SUSPEND,
 180                                                 PORT_SUSPEND, 5000))
 181                         pr_err("%s: timeout waiting for SUSPEND\n", __func__);
 182
 183                 set_bit((wIndex & 0xff) - 1, &ehci->suspended_ports);
 184                 goto done;
 185         }
 186
 187         /* For USB1 port we need to issue Port Reset twice internally */
 188         if (tegra->needs_double_reset &&
 189            (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_RESET)) {
 190                 spin_unlock_irqrestore(&ehci->lock, flags);
 191                 return tegra_ehci_internal_port_reset(ehci, status_reg);
 192         }
 193
 194         /*
 195          * Tegra host controller will time the resume operation to clear the bit
 196          * when the port control state switches to HS or FS Idle. This behavior
 197          * is different from EHCI where the host controller driver is required
 198          * to set this bit to a zero after the resume duration is timed in the
 199          * driver.
 200          */
 201         else if (typeReq == ClearPortFeature &&
 202                                         wValue == USB_PORT_FEAT_SUSPEND) {
 203                 temp = ehci_readl(ehci, status_reg);
 204                 if ((temp & PORT_RESET) || !(temp & PORT_PE)) {
 205                         retval = -EPIPE;
 206                         goto done;
 207                 }
 208
 209                 if (!(temp & PORT_SUSPEND))
 210                         goto done;
 211
 212                 /* Disable disconnect detection during port resume */
 213                 tegra_usb_phy_preresume(hcd->phy);
 214
 215                 ehci->reset_done[wIndex-1] = jiffies + msecs_to_jiffies(25);
 216
 217                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 218                 /* start resume signalling */
 219                 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 220                 set_bit(wIndex-1, &ehci->resuming_ports);
 221
 222                 spin_unlock_irqrestore(&ehci->lock, flags);
 223                 msleep(20);
 224                 spin_lock_irqsave(&ehci->lock, flags);
 225
 226                 /* Poll until the controller clears RESUME and SUSPEND */
 227                 if (ehci_handshake(ehci, status_reg, PORT_RESUME, 0, 2000))
 228                         pr_err("%s: timeout waiting for RESUME\n", __func__);
 229                 if (ehci_handshake(ehci, status_reg, PORT_SUSPEND, 0, 2000))
 230                         pr_err("%s: timeout waiting for SUSPEND\n", __func__);
 231
 232                 ehci->reset_done[wIndex-1] = 0;
 233                 clear_bit(wIndex-1, &ehci->resuming_ports);
 234
 235                 tegra->port_resuming = 1;
 236                 goto done;
 237         }
 238
 239         spin_unlock_irqrestore(&ehci->lock, flags);
 240
 241         /* Handle the hub control events here */
 242         return orig_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
 243
 244 done:
 245         spin_unlock_irqrestore(&ehci->lock, flags);
 246         return retval;
 247 }
 248
 249 struct dma_aligned_buffer {
 250         void *kmalloc_ptr;
 251         void *old_xfer_buffer;
 252         u8 data[0];
 253 };
 254
 255 static void free_dma_aligned_buffer(struct urb *urb)
 256 {
 257         struct dma_aligned_buffer *temp;
 258
 259         if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
 260                 return;
 261
 262         temp = container_of(urb->transfer_buffer,
 263                 struct dma_aligned_buffer, data);
 264
 265         if (usb_urb_dir_in(urb))
 266                 memcpy(temp->old_xfer_buffer, temp->data,
 267                        urb->transfer_buffer_length);
 268         urb->transfer_buffer = temp->old_xfer_buffer;
 269         kfree(temp->kmalloc_ptr);
 270
 271         urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
 272 }
 273
 274 static int alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
 275 {
 276         struct dma_aligned_buffer *temp, *kmalloc_ptr;
 277         size_t kmalloc_size;
 278
 279         if (urb->num_sgs || urb->sg ||
 280             urb->transfer_buffer_length == 0 ||
 281             !((uintptr_t)urb->transfer_buffer & (TEGRA_USB_DMA_ALIGN - 1)))
 282                 return 0;
 283
 284         /* Allocate a buffer with enough padding for alignment */
 285         kmalloc_size = urb->transfer_buffer_length +
 286                 sizeof(struct dma_aligned_buffer) + TEGRA_USB_DMA_ALIGN - 1;
 287
 288         kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
 289         if (!kmalloc_ptr)
 290                 return -ENOMEM;
 291
 292         /* Position our struct dma_aligned_buffer such that data is aligned */
 293         temp = PTR_ALIGN(kmalloc_ptr + 1, TEGRA_USB_DMA_ALIGN) - 1;
 294         temp->kmalloc_ptr = kmalloc_ptr;
 295         temp->old_xfer_buffer = urb->transfer_buffer;
 296         if (usb_urb_dir_out(urb))
 297                 memcpy(temp->data, urb->transfer_buffer,
 298                        urb->transfer_buffer_length);
 299         urb->transfer_buffer = temp->data;
 300
 301         urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
 302
 303         return 0;
 304 }
 305
 306 static int tegra_ehci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 307                                       gfp_t mem_flags)
 308 {
 309         int ret;
 310
 311         ret = alloc_dma_aligned_buffer(urb, mem_flags);
 312         if (ret)
 313                 return ret;
 314
 315         ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
 316         if (ret)
 317                 free_dma_aligned_buffer(urb);
 318
 319         return ret;
 320 }
 321
 322 static void tegra_ehci_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
 323 {
 324         usb_hcd_unmap_urb_for_dma(hcd, urb);
 325         free_dma_aligned_buffer(urb);
 326 }
 327
 328 static const struct tegra_ehci_soc_config tegra30_soc_config = {
 329         .has_hostpc = true,
 330 };
 331
 332 static const struct tegra_ehci_soc_config tegra20_soc_config = {
 333         .has_hostpc = false,
 334 };
 335
 336 static struct of_device_id tegra_ehci_of_match[] = {
 337         { .compatible = "nvidia,tegra30-ehci", .data = &tegra30_soc_config },
 338         { .compatible = "nvidia,tegra20-ehci", .data = &tegra20_soc_config },
 339         { },
 340 };
 341
 342 static int tegra_ehci_probe(struct platform_device *pdev)
 343 {
 344         const struct of_device_id *match;
 345         const struct tegra_ehci_soc_config *soc_config;
 346         struct resource *res;
 347         struct usb_hcd *hcd;
 348         struct ehci_hcd *ehci;
 349         struct tegra_ehci_hcd *tegra;
 350         int err = 0;
 351         int irq;
 352         struct usb_phy *u_phy;
 353
 354         match = of_match_device(tegra_ehci_of_match, &pdev->dev);
 355         if (!match) {
 356                 dev_err(&pdev->dev, "Error: No device match found\n");
 357                 return -ENODEV;
 358         }
 359         soc_config = match->data;
 360
 361         /* Right now device-tree probed devices don't get dma_mask set.
 362          * Since shared usb code relies on it, set it here for now.
 363          * Once we have dma capability bindings this can go away.
 364          */
 365         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 366         if (err)
 367                 return err;
 368
 369         hcd = usb_create_hcd(&tegra_ehci_hc_driver, &pdev->dev,
 370                                         dev_name(&pdev->dev));
 371         if (!hcd) {
 372                 dev_err(&pdev->dev, "Unable to create HCD\n");
 373                 return -ENOMEM;
 374         }
 375         platform_set_drvdata(pdev, hcd);
 376         ehci = hcd_to_ehci(hcd);
 377         tegra = (struct tegra_ehci_hcd *)ehci->priv;
 378
 379         hcd->has_tt = 1;
 380
 381         tegra->clk = devm_clk_get(&pdev->dev, NULL);
 382         if (IS_ERR(tegra->clk)) {
 383                 dev_err(&pdev->dev, "Can't get ehci clock\n");
 384                 err = PTR_ERR(tegra->clk);
 385                 goto cleanup_hcd_create;
 386         }
 387
 388         err = clk_prepare_enable(tegra->clk);
 389         if (err)
 390                 goto cleanup_hcd_create;
 391
 392         tegra_periph_reset_assert(tegra->clk);
 393         udelay(1);
 394         tegra_periph_reset_deassert(tegra->clk);
 395
 396         u_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
 397         if (IS_ERR(u_phy)) {
 398                 err = PTR_ERR(u_phy);
 399                 goto cleanup_clk_en;
 400         }
 401         hcd->phy = u_phy;
 402
 403         tegra->needs_double_reset = of_property_read_bool(pdev->dev.of_node,
 404                 "nvidia,needs-double-reset");
 405
 406         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 407         if (!res) {
 408                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 409                 err = -ENXIO;
 410                 goto cleanup_clk_en;
 411         }
 412         hcd->rsrc_start = res->start;
 413         hcd->rsrc_len = resource_size(res);
 414         hcd->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 415         if (!hcd->regs) {
 416                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 417                 err = -ENOMEM;
 418                 goto cleanup_clk_en;
 419         }
 420         ehci->caps = hcd->regs + 0x100;
 421         ehci->has_hostpc = soc_config->has_hostpc;
 422
 423         err = usb_phy_init(hcd->phy);
 424         if (err) {
 425                 dev_err(&pdev->dev, "Failed to initialize phy\n");
 426                 goto cleanup_clk_en;
 427         }
 428
 429         u_phy->otg = devm_kzalloc(&pdev->dev, sizeof(struct usb_otg),
 430                              GFP_KERNEL);
 431         if (!u_phy->otg) {
 432                 dev_err(&pdev->dev, "Failed to alloc memory for otg\n");
 433                 err = -ENOMEM;
 434                 goto cleanup_phy;
 435         }
 436         u_phy->otg->host = hcd_to_bus(hcd);
 437
 438         err = usb_phy_set_suspend(hcd->phy, 0);
 439         if (err) {
 440                 dev_err(&pdev->dev, "Failed to power on the phy\n");
 441                 goto cleanup_phy;
 442         }
 443
 444         irq = platform_get_irq(pdev, 0);
 445         if (!irq) {
 446                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 447                 err = -ENODEV;
 448                 goto cleanup_phy;
 449         }
 450
 451         otg_set_host(u_phy->otg, &hcd->self);
 452
 453         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 454         if (err) {
 455                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 456                 goto cleanup_otg_set_host;
 457         }
 458
 459         return err;
 460
 461 cleanup_otg_set_host:
 462         otg_set_host(u_phy->otg, NULL);
 463 cleanup_phy:
 464         usb_phy_shutdown(hcd->phy);
 465 cleanup_clk_en:
 466         clk_disable_unprepare(tegra->clk);
 467 cleanup_hcd_create:
 468         usb_put_hcd(hcd);
 469         return err;
 470 }
 471
 472 static int tegra_ehci_remove(struct platform_device *pdev)
 473 {
 474         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 475         struct tegra_ehci_hcd *tegra =
 476                 (struct tegra_ehci_hcd *)hcd_to_ehci(hcd)->priv;
 477
 478         otg_set_host(hcd->phy->otg, NULL);
 479
 480         usb_phy_shutdown(hcd->phy);
 481         usb_remove_hcd(hcd);
 482         usb_put_hcd(hcd);
 483
 484         clk_disable_unprepare(tegra->clk);
 485
 486         return 0;
 487 }
 488
 489 static void tegra_ehci_hcd_shutdown(struct platform_device *pdev)
 490 {
 491         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 492
 493         if (hcd->driver->shutdown)
 494                 hcd->driver->shutdown(hcd);
 495 }
 496
 497 static struct platform_driver tegra_ehci_driver = {
 498         .probe          = tegra_ehci_probe,
 499         .remove         = tegra_ehci_remove,
 500         .shutdown       = tegra_ehci_hcd_shutdown,
 501         .driver         = {
 502                 .name   = DRV_NAME,
 503                 .of_match_table = tegra_ehci_of_match,
 504         }
 505 };
 506
 507 static const struct ehci_driver_overrides tegra_overrides __initconst = {
 508         .extra_priv_size        = sizeof(struct tegra_ehci_hcd),
 509 };
 510
 511 static int __init ehci_tegra_init(void)
 512 {
 513         if (usb_disabled())
 514                 return -ENODEV;
 515
 516         pr_info(DRV_NAME ": " DRIVER_DESC "\n");
 517
 518         ehci_init_driver(&tegra_ehci_hc_driver, &tegra_overrides);
 519
 520         /*
 521          * The Tegra HW has some unusual quirks, which require Tegra-specific
 522          * workarounds. We override certain hc_driver functions here to
 523          * achieve that. We explicitly do not enhance ehci_driver_overrides to
 524          * allow this more easily, since this is an unusual case, and we don't
 525          * want to encourage others to override these functions by making it
 526          * too easy.
 527          */
 528
 529         orig_hub_control = tegra_ehci_hc_driver.hub_control;
 530
 531         tegra_ehci_hc_driver.map_urb_for_dma = tegra_ehci_map_urb_for_dma;
 532         tegra_ehci_hc_driver.unmap_urb_for_dma = tegra_ehci_unmap_urb_for_dma;
 533         tegra_ehci_hc_driver.hub_control = tegra_ehci_hub_control;
 534
 535         return platform_driver_register(&tegra_ehci_driver);
 536 }
 537 module_init(ehci_tegra_init);
 538
 539 static void __exit ehci_tegra_cleanup(void)
 540 {
 541         platform_driver_unregister(&tegra_ehci_driver);
 542 }
 543 module_exit(ehci_tegra_cleanup);
 544
 545 MODULE_DESCRIPTION(DRIVER_DESC);
 546 MODULE_LICENSE("GPL");
 547 MODULE_ALIAS("platform:" DRV_NAME);
 548 MODULE_DEVICE_TABLE(of, tegra_ehci_of_match);