drivers/usb/musb/blackfin.c

   1 /*
   2  * MUSB OTG controller driver for Blackfin Processors
   3  *
   4  * Copyright 2006-2008 Analog Devices Inc.
   5  *
   6  * Enter bugs at http://blackfin.uclinux.org/
   7  *
   8  * Licensed under the GPL-2 or later.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/list.h>
  15 #include <linux/gpio.h>
  16 #include <linux/io.h>
  17 #include <linux/err.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/prefetch.h>
  21 #include <linux/usb/usb_phy_generic.h>
  22
  23 #include <asm/cacheflush.h>
  24
  25 #include "musb_core.h"
  26 #include "musbhsdma.h"
  27 #include "blackfin.h"
  28
  29 struct bfin_glue {
  30         struct device           *dev;
  31         struct platform_device  *musb;
  32         struct platform_device  *phy;
  33 };
  34 #define glue_to_musb(g)         platform_get_drvdata(g->musb)
  35
  36 /*
  37  * Load an endpoint's FIFO
  38  */
  39 void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
  40 {
  41         struct musb *musb = hw_ep->musb;
  42         void __iomem *fifo = hw_ep->fifo;
  43         void __iomem *epio = hw_ep->regs;
  44         u8 epnum = hw_ep->epnum;
  45
  46         prefetch((u8 *)src);
  47
  48         musb_writew(epio, MUSB_TXCOUNT, len);
  49
  50         dev_dbg(musb->controller, "TX ep%d fifo %p count %d buf %p, epio %p\n",
  51                         hw_ep->epnum, fifo, len, src, epio);
  52
  53         dump_fifo_data(src, len);
  54
  55         if (!ANOMALY_05000380 && epnum != 0) {
  56                 u16 dma_reg;
  57
  58                 flush_dcache_range((unsigned long)src,
  59                         (unsigned long)(src + len));
  60
  61                 /* Setup DMA address register */
  62                 dma_reg = (u32)src;
  63                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
  64                 SSYNC();
  65
  66                 dma_reg = (u32)src >> 16;
  67                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
  68                 SSYNC();
  69
  70                 /* Setup DMA count register */
  71                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
  72                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
  73                 SSYNC();
  74
  75                 /* Enable the DMA */
  76                 dma_reg = (epnum << 4) | DMA_ENA | INT_ENA | DIRECTION;
  77                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
  78                 SSYNC();
  79
  80                 /* Wait for complete */
  81                 while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
  82                         cpu_relax();
  83
  84                 /* acknowledge dma interrupt */
  85                 bfin_write_USB_DMA_INTERRUPT(1 << epnum);
  86                 SSYNC();
  87
  88                 /* Reset DMA */
  89                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
  90                 SSYNC();
  91         } else {
  92                 SSYNC();
  93
  94                 if (unlikely((unsigned long)src & 0x01))
  95                         outsw_8((unsigned long)fifo, src, (len + 1) >> 1);
  96                 else
  97                         outsw((unsigned long)fifo, src, (len + 1) >> 1);
  98         }
  99 }
 100 /*
 101  * Unload an endpoint's FIFO
 102  */
 103 void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
 104 {
 105         struct musb *musb = hw_ep->musb;
 106         void __iomem *fifo = hw_ep->fifo;
 107         u8 epnum = hw_ep->epnum;
 108
 109         if (ANOMALY_05000467 && epnum != 0) {
 110                 u16 dma_reg;
 111
 112                 invalidate_dcache_range((unsigned long)dst,
 113                         (unsigned long)(dst + len));
 114
 115                 /* Setup DMA address register */
 116                 dma_reg = (u32)dst;
 117                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
 118                 SSYNC();
 119
 120                 dma_reg = (u32)dst >> 16;
 121                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
 122                 SSYNC();
 123
 124                 /* Setup DMA count register */
 125                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
 126                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
 127                 SSYNC();
 128
 129                 /* Enable the DMA */
 130                 dma_reg = (epnum << 4) | DMA_ENA | INT_ENA;
 131                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
 132                 SSYNC();
 133
 134                 /* Wait for complete */
 135                 while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
 136                         cpu_relax();
 137
 138                 /* acknowledge dma interrupt */
 139                 bfin_write_USB_DMA_INTERRUPT(1 << epnum);
 140                 SSYNC();
 141
 142                 /* Reset DMA */
 143                 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
 144                 SSYNC();
 145         } else {
 146                 SSYNC();
 147                 /* Read the last byte of packet with odd size from address fifo + 4
 148                  * to trigger 1 byte access to EP0 FIFO.
 149                  */
 150                 if (len == 1)
 151                         *dst = (u8)inw((unsigned long)fifo + 4);
 152                 else {
 153                         if (unlikely((unsigned long)dst & 0x01))
 154                                 insw_8((unsigned long)fifo, dst, len >> 1);
 155                         else
 156                                 insw((unsigned long)fifo, dst, len >> 1);
 157
 158                         if (len & 0x01)
 159                                 *(dst + len - 1) = (u8)inw((unsigned long)fifo + 4);
 160                 }
 161         }
 162         dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
 163                         'R', hw_ep->epnum, fifo, len, dst);
 164
 165         dump_fifo_data(dst, len);
 166 }
 167
 168 static irqreturn_t blackfin_interrupt(int irq, void *__hci)
 169 {
 170         unsigned long   flags;
 171         irqreturn_t     retval = IRQ_NONE;
 172         struct musb     *musb = __hci;
 173
 174         spin_lock_irqsave(&musb->lock, flags);
 175
 176         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
 177         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
 178         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
 179
 180         if (musb->int_usb || musb->int_tx || musb->int_rx) {
 181                 musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
 182                 musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx);
 183                 musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx);
 184                 retval = musb_interrupt(musb);
 185         }
 186
 187         /* Start sampling ID pin, when plug is removed from MUSB */
 188         if ((musb->xceiv->state == OTG_STATE_B_IDLE
 189                 || musb->xceiv->state == OTG_STATE_A_WAIT_BCON) ||
 190                 (musb->int_usb & MUSB_INTR_DISCONNECT && is_host_active(musb))) {
 191                 mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
 192                 musb->a_wait_bcon = TIMER_DELAY;
 193         }
 194
 195         spin_unlock_irqrestore(&musb->lock, flags);
 196
 197         return retval;
 198 }
 199
 200 static void musb_conn_timer_handler(unsigned long _musb)
 201 {
 202         struct musb *musb = (void *)_musb;
 203         unsigned long flags;
 204         u16 val;
 205         static u8 toggle;
 206
 207         spin_lock_irqsave(&musb->lock, flags);
 208         switch (musb->xceiv->state) {
 209         case OTG_STATE_A_IDLE:
 210         case OTG_STATE_A_WAIT_BCON:
 211                 /* Start a new session */
 212                 val = musb_readw(musb->mregs, MUSB_DEVCTL);
 213                 val &= ~MUSB_DEVCTL_SESSION;
 214                 musb_writew(musb->mregs, MUSB_DEVCTL, val);
 215                 val |= MUSB_DEVCTL_SESSION;
 216                 musb_writew(musb->mregs, MUSB_DEVCTL, val);
 217                 /* Check if musb is host or peripheral. */
 218                 val = musb_readw(musb->mregs, MUSB_DEVCTL);
 219
 220                 if (!(val & MUSB_DEVCTL_BDEVICE)) {
 221                         gpio_set_value(musb->config->gpio_vrsel, 1);
 222                         musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
 223                 } else {
 224                         gpio_set_value(musb->config->gpio_vrsel, 0);
 225                         /* Ignore VBUSERROR and SUSPEND IRQ */
 226                         val = musb_readb(musb->mregs, MUSB_INTRUSBE);
 227                         val &= ~MUSB_INTR_VBUSERROR;
 228                         musb_writeb(musb->mregs, MUSB_INTRUSBE, val);
 229
 230                         val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR;
 231                         musb_writeb(musb->mregs, MUSB_INTRUSB, val);
 232                         musb->xceiv->state = OTG_STATE_B_IDLE;
 233                 }
 234                 mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
 235                 break;
 236         case OTG_STATE_B_IDLE:
 237                 /*
 238                  * Start a new session.  It seems that MUSB needs taking
 239                  * some time to recognize the type of the plug inserted?
 240                  */
 241                 val = musb_readw(musb->mregs, MUSB_DEVCTL);
 242                 val |= MUSB_DEVCTL_SESSION;
 243                 musb_writew(musb->mregs, MUSB_DEVCTL, val);
 244                 val = musb_readw(musb->mregs, MUSB_DEVCTL);
 245
 246                 if (!(val & MUSB_DEVCTL_BDEVICE)) {
 247                         gpio_set_value(musb->config->gpio_vrsel, 1);
 248                         musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
 249                 } else {
 250                         gpio_set_value(musb->config->gpio_vrsel, 0);
 251
 252                         /* Ignore VBUSERROR and SUSPEND IRQ */
 253                         val = musb_readb(musb->mregs, MUSB_INTRUSBE);
 254                         val &= ~MUSB_INTR_VBUSERROR;
 255                         musb_writeb(musb->mregs, MUSB_INTRUSBE, val);
 256
 257                         val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR;
 258                         musb_writeb(musb->mregs, MUSB_INTRUSB, val);
 259
 260                         /* Toggle the Soft Conn bit, so that we can response to
 261                          * the inserting of either A-plug or B-plug.
 262                          */
 263                         if (toggle) {
 264                                 val = musb_readb(musb->mregs, MUSB_POWER);
 265                                 val &= ~MUSB_POWER_SOFTCONN;
 266                                 musb_writeb(musb->mregs, MUSB_POWER, val);
 267                                 toggle = 0;
 268                         } else {
 269                                 val = musb_readb(musb->mregs, MUSB_POWER);
 270                                 val |= MUSB_POWER_SOFTCONN;
 271                                 musb_writeb(musb->mregs, MUSB_POWER, val);
 272                                 toggle = 1;
 273                         }
 274                         /* The delay time is set to 1/4 second by default,
 275                          * shortening it, if accelerating A-plug detection
 276                          * is needed in OTG mode.
 277                          */
 278                         mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY / 4);
 279                 }
 280                 break;
 281         default:
 282                 dev_dbg(musb->controller, "%s state not handled\n",
 283                         usb_otg_state_string(musb->xceiv->state));
 284                 break;
 285         }
 286         spin_unlock_irqrestore(&musb->lock, flags);
 287
 288         dev_dbg(musb->controller, "state is %s\n",
 289                 usb_otg_state_string(musb->xceiv->state));
 290 }
 291
 292 static void bfin_musb_enable(struct musb *musb)
 293 {
 294         /* REVISIT is this really correct ? */
 295 }
 296
 297 static void bfin_musb_disable(struct musb *musb)
 298 {
 299 }
 300
 301 static void bfin_musb_set_vbus(struct musb *musb, int is_on)
 302 {
 303         int value = musb->config->gpio_vrsel_active;
 304         if (!is_on)
 305                 value = !value;
 306         gpio_set_value(musb->config->gpio_vrsel, value);
 307
 308         dev_dbg(musb->controller, "VBUS %s, devctl %02x "
 309                 /* otg %3x conf %08x prcm %08x */ "\n",
 310                 usb_otg_state_string(musb->xceiv->state),
 311                 musb_readb(musb->mregs, MUSB_DEVCTL));
 312 }
 313
 314 static int bfin_musb_set_power(struct usb_phy *x, unsigned mA)
 315 {
 316         return 0;
 317 }
 318
 319 static int bfin_musb_vbus_status(struct musb *musb)
 320 {
 321         return 0;
 322 }
 323
 324 static int bfin_musb_set_mode(struct musb *musb, u8 musb_mode)
 325 {
 326         return -EIO;
 327 }
 328
 329 static int bfin_musb_adjust_channel_params(struct dma_channel *channel,
 330                                 u16 packet_sz, u8 *mode,
 331                                 dma_addr_t *dma_addr, u32 *len)
 332 {
 333         struct musb_dma_channel *musb_channel = channel->private_data;
 334
 335         /*
 336          * Anomaly 05000450 might cause data corruption when using DMA
 337          * MODE 1 transmits with short packet.  So to work around this,
 338          * we truncate all MODE 1 transfers down to a multiple of the
 339          * max packet size, and then do the last short packet transfer
 340          * (if there is any) using MODE 0.
 341          */
 342         if (ANOMALY_05000450) {
 343                 if (musb_channel->transmit && *mode == 1)
 344                         *len = *len - (*len % packet_sz);
 345         }
 346
 347         return 0;
 348 }
 349
 350 static void bfin_musb_reg_init(struct musb *musb)
 351 {
 352         if (ANOMALY_05000346) {
 353                 bfin_write_USB_APHY_CALIB(ANOMALY_05000346_value);
 354                 SSYNC();
 355         }
 356
 357         if (ANOMALY_05000347) {
 358                 bfin_write_USB_APHY_CNTRL(0x0);
 359                 SSYNC();
 360         }
 361
 362         /* Configure PLL oscillator register */
 363         bfin_write_USB_PLLOSC_CTRL(0x3080 |
 364                         ((480/musb->config->clkin) << 1));
 365         SSYNC();
 366
 367         bfin_write_USB_SRP_CLKDIV((get_sclk()/1000) / 32 - 1);
 368         SSYNC();
 369
 370         bfin_write_USB_EP_NI0_RXMAXP(64);
 371         SSYNC();
 372
 373         bfin_write_USB_EP_NI0_TXMAXP(64);
 374         SSYNC();
 375
 376         /* Route INTRUSB/INTR_RX/INTR_TX to USB_INT0*/
 377         bfin_write_USB_GLOBINTR(0x7);
 378         SSYNC();
 379
 380         bfin_write_USB_GLOBAL_CTL(GLOBAL_ENA | EP1_TX_ENA | EP2_TX_ENA |
 381                                 EP3_TX_ENA | EP4_TX_ENA | EP5_TX_ENA |
 382                                 EP6_TX_ENA | EP7_TX_ENA | EP1_RX_ENA |
 383                                 EP2_RX_ENA | EP3_RX_ENA | EP4_RX_ENA |
 384                                 EP5_RX_ENA | EP6_RX_ENA | EP7_RX_ENA);
 385         SSYNC();
 386 }
 387
 388 static int bfin_musb_init(struct musb *musb)
 389 {
 390
 391         /*
 392          * Rev 1.0 BF549 EZ-KITs require PE7 to be high for both DEVICE
 393          * and OTG HOST modes, while rev 1.1 and greater require PE7 to
 394          * be low for DEVICE mode and high for HOST mode. We set it high
 395          * here because we are in host mode
 396          */
 397
 398         if (gpio_request(musb->config->gpio_vrsel, "USB_VRSEL")) {
 399                 printk(KERN_ERR "Failed ro request USB_VRSEL GPIO_%d\n",
 400                         musb->config->gpio_vrsel);
 401                 return -ENODEV;
 402         }
 403         gpio_direction_output(musb->config->gpio_vrsel, 0);
 404
 405         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 406         if (IS_ERR_OR_NULL(musb->xceiv)) {
 407                 gpio_free(musb->config->gpio_vrsel);
 408                 return -EPROBE_DEFER;
 409         }
 410
 411         bfin_musb_reg_init(musb);
 412
 413         setup_timer(&musb_conn_timer, musb_conn_timer_handler,
 414                         (unsigned long) musb);
 415
 416         musb->xceiv->set_power = bfin_musb_set_power;
 417
 418         musb->isr = blackfin_interrupt;
 419         musb->double_buffer_not_ok = true;
 420
 421         return 0;
 422 }
 423
 424 static int bfin_musb_exit(struct musb *musb)
 425 {
 426         gpio_free(musb->config->gpio_vrsel);
 427         usb_put_phy(musb->xceiv);
 428
 429         return 0;
 430 }
 431
 432 static const struct musb_platform_ops bfin_ops = {
 433         .init           = bfin_musb_init,
 434         .exit           = bfin_musb_exit,
 435
 436         .enable         = bfin_musb_enable,
 437         .disable        = bfin_musb_disable,
 438
 439         .set_mode       = bfin_musb_set_mode,
 440
 441         .vbus_status    = bfin_musb_vbus_status,
 442         .set_vbus       = bfin_musb_set_vbus,
 443
 444         .adjust_channel_params = bfin_musb_adjust_channel_params,
 445 };
 446
 447 static u64 bfin_dmamask = DMA_BIT_MASK(32);
 448
 449 static int bfin_probe(struct platform_device *pdev)
 450 {
 451         struct resource musb_resources[2];
 452         struct musb_hdrc_platform_data  *pdata = dev_get_platdata(&pdev->dev);
 453         struct platform_device          *musb;
 454         struct bfin_glue                *glue;
 455
 456         int                             ret = -ENOMEM;
 457
 458         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 459         if (!glue) {
 460                 dev_err(&pdev->dev, "failed to allocate glue context\n");
 461                 goto err0;
 462         }
 463
 464         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 465         if (!musb) {
 466                 dev_err(&pdev->dev, "failed to allocate musb device\n");
 467                 goto err0;
 468         }
 469
 470         musb->dev.parent                = &pdev->dev;
 471         musb->dev.dma_mask              = &bfin_dmamask;
 472         musb->dev.coherent_dma_mask     = bfin_dmamask;
 473
 474         glue->dev                       = &pdev->dev;
 475         glue->musb                      = musb;
 476
 477         pdata->platform_ops             = &bfin_ops;
 478
 479         glue->phy = usb_phy_generic_register();
 480         if (IS_ERR(glue->phy))
 481                 goto err1;
 482         platform_set_drvdata(pdev, glue);
 483
 484         memset(musb_resources, 0x00, sizeof(*musb_resources) *
 485                         ARRAY_SIZE(musb_resources));
 486
 487         musb_resources[0].name = pdev->resource[0].name;
 488         musb_resources[0].start = pdev->resource[0].start;
 489         musb_resources[0].end = pdev->resource[0].end;
 490         musb_resources[0].flags = pdev->resource[0].flags;
 491
 492         musb_resources[1].name = pdev->resource[1].name;
 493         musb_resources[1].start = pdev->resource[1].start;
 494         musb_resources[1].end = pdev->resource[1].end;
 495         musb_resources[1].flags = pdev->resource[1].flags;
 496
 497         ret = platform_device_add_resources(musb, musb_resources,
 498                         ARRAY_SIZE(musb_resources));
 499         if (ret) {
 500                 dev_err(&pdev->dev, "failed to add resources\n");
 501                 goto err2;
 502         }
 503
 504         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 505         if (ret) {
 506                 dev_err(&pdev->dev, "failed to add platform_data\n");
 507                 goto err2;
 508         }
 509
 510         ret = platform_device_add(musb);
 511         if (ret) {
 512                 dev_err(&pdev->dev, "failed to register musb device\n");
 513                 goto err2;
 514         }
 515
 516         return 0;
 517
 518 err2:
 519         usb_phy_generic_unregister(glue->phy);
 520
 521 err1:
 522         platform_device_put(musb);
 523
 524 err0:
 525         return ret;
 526 }
 527
 528 static int bfin_remove(struct platform_device *pdev)
 529 {
 530         struct bfin_glue                *glue = platform_get_drvdata(pdev);
 531
 532         platform_device_unregister(glue->musb);
 533         usb_phy_generic_unregister(glue->phy);
 534
 535         return 0;
 536 }
 537
 538 #ifdef CONFIG_PM
 539 static int bfin_suspend(struct device *dev)
 540 {
 541         struct bfin_glue        *glue = dev_get_drvdata(dev);
 542         struct musb             *musb = glue_to_musb(glue);
 543
 544         if (is_host_active(musb))
 545                 /*
 546                  * During hibernate gpio_vrsel will change from high to low
 547                  * low which will generate wakeup event resume the system
 548                  * immediately.  Set it to 0 before hibernate to avoid this
 549                  * wakeup event.
 550                  */
 551                 gpio_set_value(musb->config->gpio_vrsel, 0);
 552
 553         return 0;
 554 }
 555
 556 static int bfin_resume(struct device *dev)
 557 {
 558         struct bfin_glue        *glue = dev_get_drvdata(dev);
 559         struct musb             *musb = glue_to_musb(glue);
 560
 561         bfin_musb_reg_init(musb);
 562
 563         return 0;
 564 }
 565 #endif
 566
 567 static SIMPLE_DEV_PM_OPS(bfin_pm_ops, bfin_suspend, bfin_resume);
 568
 569 static struct platform_driver bfin_driver = {
 570         .probe          = bfin_probe,
 571         .remove         = __exit_p(bfin_remove),
 572         .driver         = {
 573                 .name   = "musb-blackfin",
 574                 .pm     = &bfin_pm_ops,
 575         },
 576 };
 577
 578 MODULE_DESCRIPTION("Blackfin MUSB Glue Layer");
 579 MODULE_AUTHOR("Bryan Wy <cooloney@kernel.org>");
 580 MODULE_LICENSE("GPL v2");
 581 module_platform_driver(bfin_driver);