target/linux/sunxi/patches-3.12/153-add-sunxi-ehci.patch

   1 From b84d49247eb062672a56ce15f1c08f792099de97 Mon Sep 17 00:00:00 2001
   2 From: arokux <arokux@gmail.com>
   3 Date: Wed, 18 Sep 2013 21:45:03 +0200
   4 Subject: [PATCH] ARM: sunxi: usb: Add Allwinner sunXi EHCI driver
   5
   6 ---
   7  drivers/usb/host/Kconfig      |   9 +
   8  drivers/usb/host/Makefile     |   1 +
   9  drivers/usb/host/ehci-sunxi.c | 446 ++++++++++++++++++++++++++++++++++++++++++
  10  3 files changed, 456 insertions(+)
  11  create mode 100644 drivers/usb/host/ehci-sunxi.c
  12
  13 diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
  14 index b3f20d7..ecc2745 100644
  15 --- a/drivers/usb/host/Kconfig
  16 +++ b/drivers/usb/host/Kconfig
  17 @@ -274,6 +274,15 @@ config USB_OCTEON_EHCI
  18           USB 2.0 device support.  All CN6XXX based chips with USB are
  19           supported.
  20
  21 +config USB_SUNXI_EHCI
  22 +       tristate "Allwinner sunXi EHCI support"
  23 +       depends on ARCH_SUNXI
  24 +       default n
  25 +       help
  26 +         Enable support for the Allwinner sunXi on-chip EHCI
  27 +         controller. It is needed for high-speed (480Mbit/sec)
  28 +         USB 2.0 device support.
  29 +
  30  endif # USB_EHCI_HCD
  31
  32  config USB_OXU210HP_HCD
  33 diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
  34 index 50b0041..d2e2c8c 100644
  35 --- a/drivers/usb/host/Makefile
  36 +++ b/drivers/usb/host/Makefile
  37 @@ -38,6 +38,7 @@ obj-$(CONFIG_USB_EHCI_S5P)    += ehci-s5p.o
  38  obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-atmel.o
  39  obj-$(CONFIG_USB_EHCI_MSM)     += ehci-msm.o
  40  obj-$(CONFIG_USB_EHCI_TEGRA)   += ehci-tegra.o
  41 +obj-$(CONFIG_USB_SUNXI_EHCI)   += ehci-sunxi.o
  42
  43  obj-$(CONFIG_USB_OXU210HP_HCD) += oxu210hp-hcd.o
  44  obj-$(CONFIG_USB_ISP116X_HCD)  += isp116x-hcd.o
  45 diff --git a/drivers/usb/host/ehci-sunxi.c b/drivers/usb/host/ehci-sunxi.c
  46 new file mode 100644
  47 index 0000000..e7e15cc
  48 --- /dev/null
  49 +++ b/drivers/usb/host/ehci-sunxi.c
  50 @@ -0,0 +1,446 @@
  51 +/*
  52 + * Copyright (C) 2013 Roman Byshko
  53 + *
  54 + * Roman Byshko <rbyshko@gmail.com>
  55 + *
  56 + * Based on code from
  57 + * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
  58 + *
  59 + * This file is licensed under the terms of the GNU General Public
  60 + * License version 2.  This program is licensed "as is" without any
  61 + * warranty of any kind, whether express or implied.
  62 + */
  63 +
  64 +#include <linux/bitops.h>
  65 +#include <linux/clk.h>
  66 +#include <linux/dma-mapping.h>
  67 +#include <linux/io.h>
  68 +#include <linux/irq.h>
  69 +#include <linux/module.h>
  70 +#include <linux/of.h>
  71 +#include <linux/platform_device.h>
  72 +#include <linux/regulator/consumer.h>
  73 +#include <linux/reset.h>
  74 +#include <linux/usb.h>
  75 +#include <linux/usb/hcd.h>
  76 +
  77 +#include "ehci.h"
  78 +
  79 +#define DRV_DESC       "Allwinner sunXi EHCI driver"
  80 +#define DRV_NAME       "sunxi-ehci"
  81 +
  82 +#define SUNXI_USB_PASSBY_EN    1
  83 +
  84 +#define SUNXI_EHCI_AHB_ICHR8_EN                BIT(10)
  85 +#define SUNXI_EHCI_AHB_INCR4_BURST_EN  BIT(9)
  86 +#define SUNXI_EHCI_AHB_INCRX_ALIGN_EN  BIT(8)
  87 +#define SUNXI_EHCI_ULPI_BYPASS_EN      BIT(0)
  88 +
  89 +struct sunxi_ehci_hcd {
  90 +       struct clk *phy_clk;
  91 +       struct clk *ahb_ehci_clk;
  92 +       struct reset_control *reset;
  93 +       struct regulator *vbus_reg;
  94 +       void __iomem *csr;
  95 +       void __iomem *pmuirq;
  96 +       int irq;
  97 +       int id;
  98 +};
  99 +
 100 +
 101 +static void usb_phy_write(struct sunxi_ehci_hcd *sunxi_ehci,u32 addr, u32 data, u32 len)
 102 +{
 103 +       u32 j = 0;
 104 +       u32 temp = 0;
 105 +       u32 usbc_bit = 0;
 106 +       void __iomem *dest = sunxi_ehci->csr;
 107 +
 108 +       usbc_bit = BIT(sunxi_ehci->id << 1);
 109 +
 110 +       for (j = 0; j < len; j++) {
 111 +               temp = readl(dest);
 112 +
 113 +               /* clear the address portion */
 114 +               temp &= ~(0xff << 8);
 115 +
 116 +               /* set the address */
 117 +               temp |= ((addr + j) << 8);
 118 +               writel(temp, dest);
 119 +
 120 +               /* set the data bit and clear usbc bit*/
 121 +               temp = readb(dest);
 122 +               if (data & 0x1)
 123 +                       temp |= BIT(7);
 124 +               else
 125 +                       temp &= ~BIT(7);
 126 +               temp &= ~usbc_bit;
 127 +               writeb(temp, dest);
 128 +
 129 +               /* flip usbc_bit */
 130 +               __set_bit(usbc_bit, dest);
 131 +               __clear_bit(usbc_bit, dest);
 132 +
 133 +               data >>= 1;
 134 +       }
 135 +}
 136 +
 137 +/* FIXME: should this function be protected by a lock?
 138 + * ehci1 and ehci0 could call it concurrently with same csr.
 139 + */
 140 +static void sunxi_usb_phy_init(struct sunxi_ehci_hcd *sunxi_ehci)
 141 +{
 142 +       /* The following comments are machine
 143 +        * translated from Chinese, you have been warned!
 144 +        */
 145 +
 146 +       /* adjust PHY's magnitude and rate */
 147 +       usb_phy_write(sunxi_ehci, 0x20, 0x14, 5);
 148 +
 149 +       /* threshold adjustment disconnect */
 150 +       usb_phy_write(sunxi_ehci, 0x2a, 3, 2);
 151 +
 152 +       return;
 153 +}
 154 +
 155 +static void sunxi_usb_passby(struct sunxi_ehci_hcd *sunxi_ehci, int enable)
 156 +{
 157 +       unsigned long reg_value = 0;
 158 +       unsigned long bits = 0;
 159 +       static DEFINE_SPINLOCK(lock);
 160 +       unsigned long flags = 0;
 161 +       void __iomem *addr = sunxi_ehci->pmuirq;
 162 +
 163 +       bits = SUNXI_EHCI_AHB_ICHR8_EN |
 164 +               SUNXI_EHCI_AHB_INCR4_BURST_EN |
 165 +               SUNXI_EHCI_AHB_INCRX_ALIGN_EN |
 166 +               SUNXI_EHCI_ULPI_BYPASS_EN;
 167 +
 168 +       spin_lock_irqsave(&lock, flags);
 169 +
 170 +       reg_value = readl(addr);
 171 +
 172 +       if (enable)
 173 +               reg_value |= bits;
 174 +       else
 175 +               reg_value &= ~bits;
 176 +
 177 +       writel(reg_value, addr);
 178 +
 179 +       spin_unlock_irqrestore(&lock, flags);
 180 +
 181 +       return;
 182 +}
 183 +
 184 +static void sunxi_ehci_disable(struct sunxi_ehci_hcd *sunxi_ehci)
 185 +{
 186 +       regulator_disable(sunxi_ehci->vbus_reg);
 187 +
 188 +       sunxi_usb_passby(sunxi_ehci, !SUNXI_USB_PASSBY_EN);
 189 +
 190 +       clk_disable_unprepare(sunxi_ehci->ahb_ehci_clk);
 191 +       clk_disable_unprepare(sunxi_ehci->phy_clk);
 192 +
 193 +       reset_control_assert(sunxi_ehci->reset);
 194 +}
 195 +
 196 +static int sunxi_ehci_enable(struct sunxi_ehci_hcd *sunxi_ehci)
 197 +{
 198 +       int ret;
 199 +
 200 +       ret = clk_prepare_enable(sunxi_ehci->phy_clk);
 201 +       if (ret)
 202 +               return ret;
 203 +
 204 +       ret = reset_control_deassert(sunxi_ehci->reset);
 205 +       if (ret)
 206 +               goto fail1;
 207 +
 208 +       ret = clk_prepare_enable(sunxi_ehci->ahb_ehci_clk);
 209 +       if (ret)
 210 +               goto fail2;
 211 +
 212 +       sunxi_usb_phy_init(sunxi_ehci);
 213 +
 214 +       sunxi_usb_passby(sunxi_ehci, SUNXI_USB_PASSBY_EN);
 215 +
 216 +       ret = regulator_enable(sunxi_ehci->vbus_reg);
 217 +       if (ret)
 218 +               goto fail3;
 219 +
 220 +       return 0;
 221 +
 222 +fail3:
 223 +       clk_disable_unprepare(sunxi_ehci->ahb_ehci_clk);
 224 +fail2:
 225 +       reset_control_assert(sunxi_ehci->reset);
 226 +fail1:
 227 +       clk_disable_unprepare(sunxi_ehci->phy_clk);
 228 +
 229 +       return ret;
 230 +}
 231 +
 232 +#ifdef CONFIG_PM
 233 +static int sunxi_ehci_suspend(struct device *dev)
 234 +{
 235 +       struct sunxi_ehci_hcd *sunxi_ehci = NULL;
 236 +       struct usb_hcd *hcd = dev_get_drvdata(dev);
 237 +       int ret;
 238 +
 239 +       bool do_wakeup = device_may_wakeup(dev);
 240 +
 241 +       ret = ehci_suspend(hcd, do_wakeup);
 242 +
 243 +       sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
 244 +
 245 +       sunxi_ehci_disable(sunxi_ehci);
 246 +
 247 +       return ret;
 248 +}
 249 +
 250 +static int sunxi_ehci_resume(struct device *dev)
 251 +{
 252 +       struct sunxi_ehci_hcd *sunxi_ehci = NULL;
 253 +       struct usb_hcd *hcd = dev_get_drvdata(dev);
 254 +       int ret;
 255 +
 256 +       sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
 257 +
 258 +       ret = sunxi_ehci_enable(sunxi_ehci);
 259 +       if (ret)
 260 +               return ret;
 261 +
 262 +       return ehci_resume(hcd, false);
 263 +}
 264 +
 265 +
 266 +static const struct dev_pm_ops sunxi_ehci_pmops = {
 267 +       .suspend        = sunxi_ehci_suspend,
 268 +       .resume         = sunxi_ehci_resume,
 269 +};
 270 +
 271 +#define SUNXI_EHCI_PMOPS (&sunxi_ehci_pmops)
 272 +#else /* !CONFIG_PM */
 273 +#define SUNXI_EHCI_PMOPS NULL
 274 +#endif /* CONFIG_PM */
 275 +
 276 +static const struct ehci_driver_overrides sunxi_overrides __initconst = {
 277 +       .reset =        NULL,
 278 +       .extra_priv_size        = sizeof(struct sunxi_ehci_hcd),
 279 +};
 280 +
 281 +/* FIXME: Should there be two instances of hc_driver,
 282 + * or one is enough to handle two EHCI controllers? */
 283 +static struct hc_driver __read_mostly sunxi_ehci_hc_driver;
 284 +
 285 +static int sunxi_ehci_init(struct platform_device *pdev, struct usb_hcd *hcd,
 286 +                          struct sunxi_ehci_hcd *sunxi_ehci)
 287 +{
 288 +       void __iomem *ehci_regs = NULL;
 289 +       struct resource *res = NULL;
 290 +
 291 +       sunxi_ehci->vbus_reg = devm_regulator_get(&pdev->dev, "vbus");
 292 +       if (IS_ERR(sunxi_ehci->vbus_reg)) {
 293 +               if (PTR_ERR(sunxi_ehci->vbus_reg) == -EPROBE_DEFER)
 294 +                       return -EPROBE_DEFER;
 295 +
 296 +               dev_info(&pdev->dev, "no USB VBUS power supply found\n");
 297 +       }
 298 +
 299 +       sunxi_ehci->id = of_alias_get_id(pdev->dev.of_node, "ehci");
 300 +       if (sunxi_ehci->id < 0)
 301 +               return sunxi_ehci->id;
 302 +
 303 +       /* FIXME: should res be freed on some failure? */
 304 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 305 +       if (!res) {
 306 +               dev_err(&pdev->dev, "failed to get I/O memory\n");
 307 +               return -ENXIO;
 308 +       }
 309 +       ehci_regs = devm_ioremap_resource(&pdev->dev, res);
 310 +       if (IS_ERR(ehci_regs))
 311 +               return PTR_ERR(ehci_regs);
 312 +
 313 +       hcd->rsrc_start = res->start;
 314 +       hcd->rsrc_len = resource_size(res);
 315 +       hcd->regs = ehci_regs;
 316 +       hcd_to_ehci(hcd)->caps = ehci_regs;
 317 +
 318 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 319 +       if (!res) {
 320 +               dev_err(&pdev->dev, "failed to get I/O memory\n");
 321 +               return -ENXIO;
 322 +       }
 323 +       sunxi_ehci->pmuirq = devm_ioremap_resource(&pdev->dev, res);
 324 +       if (IS_ERR(sunxi_ehci->pmuirq))
 325 +               return PTR_ERR(sunxi_ehci->pmuirq);
 326 +
 327 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
 328 +       if (!res) {
 329 +               dev_err(&pdev->dev, "failed to get I/O memory\n");
 330 +               return -ENXIO;
 331 +       }
 332 +
 333 +       /* FIXME: this one byte needs to be shared between both EHCIs,
 334 +        * that is why ioremap instead of devm_ioremap_resource,
 335 +        * memory is not unmaped back for now.
 336 +        */
 337 +       sunxi_ehci->csr = ioremap(res->start, resource_size(res));
 338 +       if (IS_ERR(sunxi_ehci->csr)) {
 339 +               dev_err(&pdev->dev, "failed to remap memory\n");
 340 +               return PTR_ERR(sunxi_ehci->csr);
 341 +       }
 342 +
 343 +       sunxi_ehci->irq = platform_get_irq(pdev, 0);
 344 +       if (!sunxi_ehci->irq) {
 345 +               dev_err(&pdev->dev, "failed to get IRQ\n");
 346 +               return -ENODEV;
 347 +       }
 348 +
 349 +       sunxi_ehci->phy_clk = devm_clk_get(&pdev->dev, "usb_phy");
 350 +       if (IS_ERR(sunxi_ehci->phy_clk)) {
 351 +               dev_err(&pdev->dev, "failed to get usb_phy clock\n");
 352 +               return PTR_ERR(sunxi_ehci->phy_clk);
 353 +       }
 354 +       sunxi_ehci->ahb_ehci_clk = devm_clk_get(&pdev->dev, "ahb_ehci");
 355 +       if (IS_ERR(sunxi_ehci->ahb_ehci_clk)) {
 356 +               dev_err(&pdev->dev, "failed to get ahb_ehci clock\n");
 357 +               return PTR_ERR(sunxi_ehci->ahb_ehci_clk);
 358 +       }
 359 +
 360 +       sunxi_ehci->reset = reset_control_get(&pdev->dev, "ehci_reset");
 361 +       if (IS_ERR(sunxi_ehci->reset))
 362 +       {
 363 +               dev_err(&pdev->dev, "failed to get ehci_reset reset line\n");
 364 +               return PTR_ERR(sunxi_ehci->reset);
 365 +       }
 366 +
 367 +       return 0;
 368 +}
 369 +
 370 +static int sunxi_ehci_probe(struct platform_device *pdev)
 371 +{
 372 +       struct sunxi_ehci_hcd *sunxi_ehci = NULL;
 373 +       struct usb_hcd *hcd = NULL;
 374 +       int ret;
 375 +
 376 +       if (pdev->num_resources != 4) {
 377 +               dev_err(&pdev->dev, "invalid number of resources: %i\n",
 378 +                      pdev->num_resources);
 379 +               return -ENODEV;
 380 +       }
 381 +
 382 +       if (pdev->resource[0].flags != IORESOURCE_MEM
 383 +                       || pdev->resource[1].flags != IORESOURCE_MEM
 384 +                       || pdev->resource[2].flags != IORESOURCE_MEM
 385 +                       || pdev->resource[3].flags != IORESOURCE_IRQ) {
 386 +               dev_err(&pdev->dev, "invalid resource type\n");
 387 +               return -ENODEV;
 388 +       }
 389 +
 390 +       if (!pdev->dev.dma_mask)
 391 +               pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 392 +       if (!pdev->dev.coherent_dma_mask)
 393 +               pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 394 +
 395 +       hcd = usb_create_hcd(&sunxi_ehci_hc_driver, &pdev->dev,
 396 +                            dev_name(&pdev->dev));
 397 +       if (!hcd) {
 398 +               dev_err(&pdev->dev, "unable to create HCD\n");
 399 +               return -ENOMEM;
 400 +       }
 401 +
 402 +       platform_set_drvdata(pdev, hcd);
 403 +
 404 +       sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
 405 +       ret = sunxi_ehci_init(pdev, hcd, sunxi_ehci);
 406 +       if (ret)
 407 +               goto fail1;
 408 +
 409 +       ret = sunxi_ehci_enable(sunxi_ehci);
 410 +       if (ret)
 411 +               goto fail1;
 412 +
 413 +       ret = usb_add_hcd(hcd, sunxi_ehci->irq, IRQF_SHARED | IRQF_DISABLED);
 414 +       if (ret) {
 415 +               dev_err(&pdev->dev, "failed to add USB HCD\n");
 416 +               goto fail2;
 417 +       }
 418 +
 419 +       return 0;
 420 +
 421 +fail2:
 422 +       sunxi_ehci_disable(sunxi_ehci);
 423 +
 424 +fail1:
 425 +       usb_put_hcd(hcd);
 426 +       return ret;
 427 +}
 428 +
 429 +static int sunxi_ehci_remove(struct platform_device *pdev)
 430 +{
 431 +       struct usb_hcd *hcd = platform_get_drvdata(pdev);
 432 +       struct sunxi_ehci_hcd *sunxi_ehci = NULL;
 433 +
 434 +       sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
 435 +
 436 +       usb_remove_hcd(hcd);
 437 +
 438 +       sunxi_ehci_disable(sunxi_ehci);
 439 +
 440 +       usb_put_hcd(hcd);
 441 +
 442 +       return 0;
 443 +}
 444 +
 445 +static void sunxi_ehci_shutdown(struct platform_device *pdev)
 446 +{
 447 +       struct usb_hcd *hcd = platform_get_drvdata(pdev);
 448 +       struct sunxi_ehci_hcd *sunxi_ehci = NULL;
 449 +
 450 +       sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
 451 +
 452 +       usb_hcd_platform_shutdown(pdev);
 453 +
 454 +       sunxi_ehci_disable(sunxi_ehci);
 455 +}
 456 +
 457 +static const struct of_device_id ehci_of_match[] = {
 458 +       {.compatible = "allwinner,sunxi-ehci"},
 459 +       {},
 460 +};
 461 +
 462 +static struct platform_driver ehci_sunxi_driver = {
 463 +       .driver = {
 464 +               .of_match_table = ehci_of_match,
 465 +               .name = DRV_NAME,
 466 +               .pm = SUNXI_EHCI_PMOPS,
 467 +       },
 468 +       .probe = sunxi_ehci_probe,
 469 +       .remove = sunxi_ehci_remove,
 470 +       .shutdown = sunxi_ehci_shutdown,
 471 +};
 472 +
 473 +static int __init sunxi_ehci_init_module(void)
 474 +{
 475 +       if (usb_disabled())
 476 +               return -ENODEV;
 477 +
 478 +       pr_info(DRV_NAME ": " DRV_DESC "\n");
 479 +
 480 +       ehci_init_driver(&sunxi_ehci_hc_driver, &sunxi_overrides);
 481 +
 482 +       return platform_driver_register(&ehci_sunxi_driver);
 483 +}
 484 +module_init(sunxi_ehci_init_module);
 485 +
 486 +static void __exit sunxi_ehci_exit_module(void)
 487 +{
 488 +       platform_driver_unregister(&ehci_sunxi_driver);
 489 +}
 490 +module_exit(sunxi_ehci_exit_module);
 491 +
 492 +MODULE_DESCRIPTION(DRIVER_DESC);
 493 +MODULE_LICENSE("GPL");
 494 +MODULE_ALIAS("platform:" DRV_NAME);
 495 +MODULE_DEVICE_TABLE(of, ehci_of_match);
 496 +MODULE_AUTHOR("Roman Byshko <rbyshko@gmail.com>");
 497 --
 498 1.8.4
 499