1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * SL811HS HCD (Host Controller Driver) for USB.
   4 *
   5 * Copyright (C) 2004 Psion Teklogix (for NetBook PRO)
   6 * Copyright (C) 2004-2005 David Brownell
   7 *
   8 * Periodic scheduling is based on Roman's OHCI code
   9 * 	Copyright (C) 1999 Roman Weissgaerber
  10 *
  11 * The SL811HS controller handles host side USB (like the SL11H, but with
  12 * another register set and SOF generation) as well as peripheral side USB
  13 * (like the SL811S).  This driver version doesn't implement the Gadget API
  14 * for the peripheral role; or OTG (that'd need much external circuitry).
  15 *
  16 * For documentation, see the SL811HS spec and the "SL811HS Embedded Host"
  17 * document (providing significant pieces missing from that spec); plus
  18 * the SL811S spec if you want peripheral side info.
  19 */
  20
  21/*
  22 * Status:  Passed basic stress testing, works with hubs, mice, keyboards,
  23 * and usb-storage.
  24 *
  25 * TODO:
  26 * - usb suspend/resume triggered by sl811
  27 * - various issues noted in the code
  28 * - performance work; use both register banks; ...
  29 * - use urb->iso_frame_desc[] with ISO transfers
  30 */
  31
  32#undef	VERBOSE
  33#undef	PACKET_TRACE
  34
  35#include <linux/module.h>
  36#include <linux/moduleparam.h>
  37#include <linux/kernel.h>
  38#include <linux/delay.h>
  39#include <linux/ioport.h>
  40#include <linux/sched.h>
  41#include <linux/slab.h>
  42#include <linux/errno.h>
  43#include <linux/timer.h>
  44#include <linux/list.h>
  45#include <linux/interrupt.h>
  46#include <linux/usb.h>
  47#include <linux/usb/sl811.h>
  48#include <linux/usb/hcd.h>
  49#include <linux/platform_device.h>
  50#include <linux/prefetch.h>
  51#include <linux/debugfs.h>
  52#include <linux/seq_file.h>
  53
  54#include <asm/io.h>
  55#include <asm/irq.h>
  56#include <asm/byteorder.h>
  57#include <asm/unaligned.h>
  58
  59#include "sl811.h"
  60
  61
  62MODULE_DESCRIPTION("SL811HS USB Host Controller Driver");
  63MODULE_LICENSE("GPL");
  64MODULE_ALIAS("platform:sl811-hcd");
  65
  66#define DRIVER_VERSION	"19 May 2005"
  67
  68/* for now, use only one transfer register bank */
  69#undef	USE_B
  70
  71// #define	QUIRK2
  72#define	QUIRK3
  73
  74static const char hcd_name[] = "sl811-hcd";
  75
  76/*-------------------------------------------------------------------------*/
  77
  78static void port_power(struct sl811 *sl811, int is_on)
  79{
  80	struct usb_hcd	*hcd = sl811_to_hcd(sl811);
  81
  82	/* hub is inactive unless the port is powered */
  83	if (is_on) {
  84		if (sl811->port1 & USB_PORT_STAT_POWER)
  85			return;
  86
  87		sl811->port1 = USB_PORT_STAT_POWER;
  88		sl811->irq_enable = SL11H_INTMASK_INSRMV;
  89	} else {
  90		sl811->port1 = 0;
  91		sl811->irq_enable = 0;
  92		hcd->state = HC_STATE_HALT;
  93	}
  94	sl811->ctrl1 = 0;
  95	sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
  96	sl811_write(sl811, SL11H_IRQ_STATUS, ~0);
  97
  98	if (sl811->board && sl811->board->port_power) {
  99		/* switch VBUS, at 500mA unless hub power budget gets set */
 100		dev_dbg(hcd->self.controller, "power %s\n",
 101			is_on ? "on" : "off");
 102		sl811->board->port_power(hcd->self.controller, is_on);
 103	}
 104
 105	/* reset as thoroughly as we can */
 106	if (sl811->board && sl811->board->reset)
 107		sl811->board->reset(hcd->self.controller);
 108	else {
 109		sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0);
 110		mdelay(20);
 111	}
 112
 113	sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
 114	sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
 115	sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT);
 116	sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 117
 118	// if !is_on, put into lowpower mode now
 119}
 120
 121/*-------------------------------------------------------------------------*/
 122
 123/* This is a PIO-only HCD.  Queueing appends URBs to the endpoint's queue,
 124 * and may start I/O.  Endpoint queues are scanned during completion irq
 125 * handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation.
 126 *
 127 * Using an external DMA engine to copy a packet at a time could work,
 128 * though setup/teardown costs may be too big to make it worthwhile.
 129 */
 130
 131/* SETUP starts a new control request.  Devices are not allowed to
 132 * STALL or NAK these; they must cancel any pending control requests.
 133 */
 134static void setup_packet(
 135	struct sl811		*sl811,
 136	struct sl811h_ep	*ep,
 137	struct urb		*urb,
 138	u8			bank,
 139	u8			control
 140)
 141{
 142	u8			addr;
 143	u8			len;
 144	void __iomem		*data_reg;
 145
 146	addr = SL811HS_PACKET_BUF(bank == 0);
 147	len = sizeof(struct usb_ctrlrequest);
 148	data_reg = sl811->data_reg;
 149	sl811_write_buf(sl811, addr, urb->setup_packet, len);
 150
 151	/* autoincrementing */
 152	sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 153	writeb(len, data_reg);
 154	writeb(SL_SETUP /* | ep->epnum */, data_reg);
 155	writeb(usb_pipedevice(urb->pipe), data_reg);
 156
 157	/* always OUT/data0 */
 158	sl811_write(sl811, bank + SL11H_HOSTCTLREG,
 159			control | SL11H_HCTLMASK_OUT);
 160	ep->length = 0;
 161	PACKET("SETUP qh%p\n", ep);
 162}
 163
 164/* STATUS finishes control requests, often after IN or OUT data packets */
 165static void status_packet(
 166	struct sl811		*sl811,
 167	struct sl811h_ep	*ep,
 168	struct urb		*urb,
 169	u8			bank,
 170	u8			control
 171)
 172{
 173	int			do_out;
 174	void __iomem		*data_reg;
 175
 176	do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe);
 177	data_reg = sl811->data_reg;
 178
 179	/* autoincrementing */
 180	sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
 181	writeb(0, data_reg);
 182	writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg);
 183	writeb(usb_pipedevice(urb->pipe), data_reg);
 184
 185	/* always data1; sometimes IN */
 186	control |= SL11H_HCTLMASK_TOGGLE;
 187	if (do_out)
 188		control |= SL11H_HCTLMASK_OUT;
 189	sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
 190	ep->length = 0;
 191	PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "",
 192			do_out ? "out" : "in", ep);
 193}
 194
 195/* IN packets can be used with any type of endpoint. here we just
 196 * start the transfer, data from the peripheral may arrive later.
 197 * urb->iso_frame_desc is currently ignored here...
 198 */
 199static void in_packet(
 200	struct sl811		*sl811,
 201	struct sl811h_ep	*ep,
 202	struct urb		*urb,
 203	u8			bank,
 204	u8			control
 205)
 206{
 207	u8			addr;
 208	u8			len;
 209	void __iomem		*data_reg;
 210
 211	/* avoid losing data on overflow */
 212	len = ep->maxpacket;
 213	addr = SL811HS_PACKET_BUF(bank == 0);
 214	if (!(control & SL11H_HCTLMASK_ISOCH)
 215			&& usb_gettoggle(urb->dev, ep->epnum, 0))
 216		control |= SL11H_HCTLMASK_TOGGLE;
 217	data_reg = sl811->data_reg;
 218
 219	/* autoincrementing */
 220	sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 221	writeb(len, data_reg);
 222	writeb(SL_IN | ep->epnum, data_reg);
 223	writeb(usb_pipedevice(urb->pipe), data_reg);
 224
 225	sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
 226	ep->length = min_t(u32, len,
 227			urb->transfer_buffer_length - urb->actual_length);
 228	PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
 229			!!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
 230}
 231
 232/* OUT packets can be used with any type of endpoint.
 233 * urb->iso_frame_desc is currently ignored here...
 234 */
 235static void out_packet(
 236	struct sl811		*sl811,
 237	struct sl811h_ep	*ep,
 238	struct urb		*urb,
 239	u8			bank,
 240	u8			control
 241)
 242{
 243	void			*buf;
 244	u8			addr;
 245	u8			len;
 246	void __iomem		*data_reg;
 247
 248	buf = urb->transfer_buffer + urb->actual_length;
 249	prefetch(buf);
 250
 251	len = min_t(u32, ep->maxpacket,
 252			urb->transfer_buffer_length - urb->actual_length);
 253
 254	if (!(control & SL11H_HCTLMASK_ISOCH)
 255			&& usb_gettoggle(urb->dev, ep->epnum, 1))
 256		control |= SL11H_HCTLMASK_TOGGLE;
 257	addr = SL811HS_PACKET_BUF(bank == 0);
 258	data_reg = sl811->data_reg;
 259
 260	sl811_write_buf(sl811, addr, buf, len);
 261
 262	/* autoincrementing */
 263	sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 264	writeb(len, data_reg);
 265	writeb(SL_OUT | ep->epnum, data_reg);
 266	writeb(usb_pipedevice(urb->pipe), data_reg);
 267
 268	sl811_write(sl811, bank + SL11H_HOSTCTLREG,
 269			control | SL11H_HCTLMASK_OUT);
 270	ep->length = len;
 271	PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
 272			!!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len);
 273}
 274
 275/*-------------------------------------------------------------------------*/
 276
 277/* caller updates on-chip enables later */
 278
 279static inline void sofirq_on(struct sl811 *sl811)
 280{
 281	if (sl811->irq_enable & SL11H_INTMASK_SOFINTR)
 282		return;
 283	dev_dbg(sl811_to_hcd(sl811)->self.controller, "sof irq on\n");
 284	sl811->irq_enable |= SL11H_INTMASK_SOFINTR;
 285}
 286
 287static inline void sofirq_off(struct sl811 *sl811)
 288{
 289	if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR))
 290		return;
 291	dev_dbg(sl811_to_hcd(sl811)->self.controller, "sof irq off\n");
 292	sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR;
 293}
 294
 295/*-------------------------------------------------------------------------*/
 296
 297/* pick the next endpoint for a transaction, and issue it.
 298 * frames start with periodic transfers (after whatever is pending
 299 * from the previous frame), and the rest of the time is async
 300 * transfers, scheduled round-robin.
 301 */
 302static struct sl811h_ep	*start(struct sl811 *sl811, u8 bank)
 303{
 304	struct sl811h_ep	*ep;
 305	struct urb		*urb;
 306	int			fclock;
 307	u8			control;
 308
 309	/* use endpoint at schedule head */
 310	if (sl811->next_periodic) {
 311		ep = sl811->next_periodic;
 312		sl811->next_periodic = ep->next;
 313	} else {
 314		if (sl811->next_async)
 315			ep = sl811->next_async;
 316		else if (!list_empty(&sl811->async))
 317			ep = container_of(sl811->async.next,
 318					struct sl811h_ep, schedule);
 319		else {
 320			/* could set up the first fullspeed periodic
 321			 * transfer for the next frame ...
 322			 */
 323			return NULL;
 324		}
 325
 326#ifdef USE_B
 327		if ((bank && sl811->active_b == ep) || sl811->active_a == ep)
 328			return NULL;
 329#endif
 330
 331		if (ep->schedule.next == &sl811->async)
 332			sl811->next_async = NULL;
 333		else
 334			sl811->next_async = container_of(ep->schedule.next,
 335					struct sl811h_ep, schedule);
 336	}
 337
 338	if (unlikely(list_empty(&ep->hep->urb_list))) {
 339		dev_dbg(sl811_to_hcd(sl811)->self.controller,
 340			"empty %p queue?\n", ep);
 341		return NULL;
 342	}
 343
 344	urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
 345	control = ep->defctrl;
 346
 347	/* if this frame doesn't have enough time left to transfer this
 348	 * packet, wait till the next frame.  too-simple algorithm...
 349	 */
 350	fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6;
 351	fclock -= 100;		/* setup takes not much time */
 352	if (urb->dev->speed == USB_SPEED_LOW) {
 353		if (control & SL11H_HCTLMASK_PREAMBLE) {
 354			/* also note erratum 1: some hubs won't work */
 355			fclock -= 800;
 356		}
 357		fclock -= ep->maxpacket << 8;
 358
 359		/* erratum 2: AFTERSOF only works for fullspeed */
 360		if (fclock < 0) {
 361			if (ep->period)
 362				sl811->stat_overrun++;
 363			sofirq_on(sl811);
 364			return NULL;
 365		}
 366	} else {
 367		fclock -= 12000 / 19;	/* 19 64byte packets/msec */
 368		if (fclock < 0) {
 369			if (ep->period)
 370				sl811->stat_overrun++;
 371			control |= SL11H_HCTLMASK_AFTERSOF;
 372
 373		/* throttle bulk/control irq noise */
 374		} else if (ep->nak_count)
 375			control |= SL11H_HCTLMASK_AFTERSOF;
 376	}
 377
 378
 379	switch (ep->nextpid) {
 380	case USB_PID_IN:
 381		in_packet(sl811, ep, urb, bank, control);
 382		break;
 383	case USB_PID_OUT:
 384		out_packet(sl811, ep, urb, bank, control);
 385		break;
 386	case USB_PID_SETUP:
 387		setup_packet(sl811, ep, urb, bank, control);
 388		break;
 389	case USB_PID_ACK:		/* for control status */
 390		status_packet(sl811, ep, urb, bank, control);
 391		break;
 392	default:
 393		dev_dbg(sl811_to_hcd(sl811)->self.controller,
 394			"bad ep%p pid %02x\n", ep, ep->nextpid);
 395		ep = NULL;
 396	}
 397	return ep;
 398}
 399
 400#define MIN_JIFFIES	((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2)
 401
 402static inline void start_transfer(struct sl811 *sl811)
 403{
 404	if (sl811->port1 & USB_PORT_STAT_SUSPEND)
 405		return;
 406	if (sl811->active_a == NULL) {
 407		sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
 408		if (sl811->active_a != NULL)
 409			sl811->jiffies_a = jiffies + MIN_JIFFIES;
 410	}
 411#ifdef USE_B
 412	if (sl811->active_b == NULL) {
 413		sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
 414		if (sl811->active_b != NULL)
 415			sl811->jiffies_b = jiffies + MIN_JIFFIES;
 416	}
 417#endif
 418}
 419
 420static void finish_request(
 421	struct sl811		*sl811,
 422	struct sl811h_ep	*ep,
 423	struct urb		*urb,
 424	int			status
 425) __releases(sl811->lock) __acquires(sl811->lock)
 426{
 427	unsigned		i;
 428
 429	if (usb_pipecontrol(urb->pipe))
 430		ep->nextpid = USB_PID_SETUP;
 431
 432	usb_hcd_unlink_urb_from_ep(sl811_to_hcd(sl811), urb);
 433	spin_unlock(&sl811->lock);
 434	usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, status);
 435	spin_lock(&sl811->lock);
 436
 437	/* leave active endpoints in the schedule */
 438	if (!list_empty(&ep->hep->urb_list))
 439		return;
 440
 441	/* async deschedule? */
 442	if (!list_empty(&ep->schedule)) {
 443		list_del_init(&ep->schedule);
 444		if (ep == sl811->next_async)
 445			sl811->next_async = NULL;
 446		return;
 447	}
 448
 449	/* periodic deschedule */
 450	dev_dbg(sl811_to_hcd(sl811)->self.controller,
 451		"deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
 452	for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
 453		struct sl811h_ep	*temp;
 454		struct sl811h_ep	**prev = &sl811->periodic[i];
 455
 456		while (*prev && ((temp = *prev) != ep))
 457			prev = &temp->next;
 458		if (*prev)
 459			*prev = ep->next;
 460		sl811->load[i] -= ep->load;
 461	}
 462	ep->branch = PERIODIC_SIZE;
 463	sl811->periodic_count--;
 464	sl811_to_hcd(sl811)->self.bandwidth_allocated
 465		-= ep->load / ep->period;
 466	if (ep == sl811->next_periodic)
 467		sl811->next_periodic = ep->next;
 468
 469	/* we might turn SOFs back on again for the async schedule */
 470	if (sl811->periodic_count == 0)
 471		sofirq_off(sl811);
 472}
 473
 474static void
 475done(struct sl811 *sl811, struct sl811h_ep *ep, u8 bank)
 476{
 477	u8			status;
 478	struct urb		*urb;
 479	int			urbstat = -EINPROGRESS;
 480
 481	if (unlikely(!ep))
 482		return;
 483
 484	status = sl811_read(sl811, bank + SL11H_PKTSTATREG);
 485
 486	urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
 487
 488	/* we can safely ignore NAKs */
 489	if (status & SL11H_STATMASK_NAK) {
 490		// PACKET("...NAK_%02x qh%p\n", bank, ep);
 491		if (!ep->period)
 492			ep->nak_count++;
 493		ep->error_count = 0;
 494
 495	/* ACK advances transfer, toggle, and maybe queue */
 496	} else if (status & SL11H_STATMASK_ACK) {
 497		struct usb_device	*udev = urb->dev;
 498		int			len;
 499		unsigned char		*buf;
 500
 501		/* urb->iso_frame_desc is currently ignored here... */
 502
 503		ep->nak_count = ep->error_count = 0;
 504		switch (ep->nextpid) {
 505		case USB_PID_OUT:
 506			// PACKET("...ACK/out_%02x qh%p\n", bank, ep);
 507			urb->actual_length += ep->length;
 508			usb_dotoggle(udev, ep->epnum, 1);
 509			if (urb->actual_length
 510					== urb->transfer_buffer_length) {
 511				if (usb_pipecontrol(urb->pipe))
 512					ep->nextpid = USB_PID_ACK;
 513
 514				/* some bulk protocols terminate OUT transfers
 515				 * by a short packet, using ZLPs not padding.
 516				 */
 517				else if (ep->length < ep->maxpacket
 518						|| !(urb->transfer_flags
 519							& URB_ZERO_PACKET))
 520					urbstat = 0;
 521			}
 522			break;
 523		case USB_PID_IN:
 524			// PACKET("...ACK/in_%02x qh%p\n", bank, ep);
 525			buf = urb->transfer_buffer + urb->actual_length;
 526			prefetchw(buf);
 527			len = ep->maxpacket - sl811_read(sl811,
 528						bank + SL11H_XFERCNTREG);
 529			if (len > ep->length) {
 530				len = ep->length;
 531				urbstat = -EOVERFLOW;
 532			}
 533			urb->actual_length += len;
 534			sl811_read_buf(sl811, SL811HS_PACKET_BUF(bank == 0),
 535					buf, len);
 536			usb_dotoggle(udev, ep->epnum, 0);
 537			if (urbstat == -EINPROGRESS &&
 538					(len < ep->maxpacket ||
 539						urb->actual_length ==
 540						urb->transfer_buffer_length)) {
 541				if (usb_pipecontrol(urb->pipe))
 542					ep->nextpid = USB_PID_ACK;
 543				else
 544					urbstat = 0;
 545			}
 546			break;
 547		case USB_PID_SETUP:
 548			// PACKET("...ACK/setup_%02x qh%p\n", bank, ep);
 549			if (urb->transfer_buffer_length == urb->actual_length)
 550				ep->nextpid = USB_PID_ACK;
 551			else if (usb_pipeout(urb->pipe)) {
 552				usb_settoggle(udev, 0, 1, 1);
 553				ep->nextpid = USB_PID_OUT;
 554			} else {
 555				usb_settoggle(udev, 0, 0, 1);
 556				ep->nextpid = USB_PID_IN;
 557			}
 558			break;
 559		case USB_PID_ACK:
 560			// PACKET("...ACK/status_%02x qh%p\n", bank, ep);
 561			urbstat = 0;
 562			break;
 563		}
 564
 565	/* STALL stops all transfers */
 566	} else if (status & SL11H_STATMASK_STALL) {
 567		PACKET("...STALL_%02x qh%p\n", bank, ep);
 568		ep->nak_count = ep->error_count = 0;
 569		urbstat = -EPIPE;
 570
 571	/* error? retry, until "3 strikes" */
 572	} else if (++ep->error_count >= 3) {
 573		if (status & SL11H_STATMASK_TMOUT)
 574			urbstat = -ETIME;
 575		else if (status & SL11H_STATMASK_OVF)
 576			urbstat = -EOVERFLOW;
 577		else
 578			urbstat = -EPROTO;
 579		ep->error_count = 0;
 580		PACKET("...3STRIKES_%02x %02x qh%p stat %d\n",
 581				bank, status, ep, urbstat);
 582	}
 583
 584	if (urbstat != -EINPROGRESS || urb->unlinked)
 585		finish_request(sl811, ep, urb, urbstat);
 586}
 587
 588static inline u8 checkdone(struct sl811 *sl811)
 589{
 590	u8	ctl;
 591	u8	irqstat = 0;
 592
 593	if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) {
 594		ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG));
 595		if (ctl & SL11H_HCTLMASK_ARM)
 596			sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
 597		dev_dbg(sl811_to_hcd(sl811)->self.controller,
 598			"%s DONE_A: ctrl %02x sts %02x\n",
 599			(ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
 600			ctl,
 601			sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
 602		irqstat |= SL11H_INTMASK_DONE_A;
 603	}
 604#ifdef	USE_B
 605	if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) {
 606		ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG));
 607		if (ctl & SL11H_HCTLMASK_ARM)
 608			sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
 609		dev_dbg(sl811_to_hcd(sl811)->self.controller,
 610			"%s DONE_B: ctrl %02x sts %02x\n",
 611			(ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
 612			ctl,
 613			sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
 614		irqstat |= SL11H_INTMASK_DONE_A;
 615	}
 616#endif
 617	return irqstat;
 618}
 619
 620static irqreturn_t sl811h_irq(struct usb_hcd *hcd)
 621{
 622	struct sl811	*sl811 = hcd_to_sl811(hcd);
 623	u8		irqstat;
 624	irqreturn_t	ret = IRQ_NONE;
 625	unsigned	retries = 5;
 626
 627	spin_lock(&sl811->lock);
 628
 629retry:
 630	irqstat = sl811_read(sl811, SL11H_IRQ_STATUS) & ~SL11H_INTMASK_DP;
 631	if (irqstat) {
 632		sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
 633		irqstat &= sl811->irq_enable;
 634	}
 635
 636#ifdef	QUIRK2
 637	/* this may no longer be necessary ... */
 638	if (irqstat == 0) {
 639		irqstat = checkdone(sl811);
 640		if (irqstat)
 641			sl811->stat_lost++;
 642	}
 643#endif
 644
 645	/* USB packets, not necessarily handled in the order they're
 646	 * issued ... that's fine if they're different endpoints.
 647	 */
 648	if (irqstat & SL11H_INTMASK_DONE_A) {
 649		done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF));
 650		sl811->active_a = NULL;
 651		sl811->stat_a++;
 652	}
 653#ifdef USE_B
 654	if (irqstat & SL11H_INTMASK_DONE_B) {
 655		done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF));
 656		sl811->active_b = NULL;
 657		sl811->stat_b++;
 658	}
 659#endif
 660	if (irqstat & SL11H_INTMASK_SOFINTR) {
 661		unsigned index;
 662
 663		index = sl811->frame++ % (PERIODIC_SIZE - 1);
 664		sl811->stat_sof++;
 665
 666		/* be graceful about almost-inevitable periodic schedule
 667		 * overruns:  continue the previous frame's transfers iff
 668		 * this one has nothing scheduled.
 669		 */
 670		if (sl811->next_periodic) {
 671			// dev_err(hcd->self.controller, "overrun to slot %d\n", index);
 672			sl811->stat_overrun++;
 673		}
 674		if (sl811->periodic[index])
 675			sl811->next_periodic = sl811->periodic[index];
 676	}
 677
 678	/* hub_wq manages debouncing and wakeup */
 679	if (irqstat & SL11H_INTMASK_INSRMV) {
 680		sl811->stat_insrmv++;
 681
 682		/* most stats are reset for each VBUS session */
 683		sl811->stat_wake = 0;
 684		sl811->stat_sof = 0;
 685		sl811->stat_a = 0;
 686		sl811->stat_b = 0;
 687		sl811->stat_lost = 0;
 688
 689		sl811->ctrl1 = 0;
 690		sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
 691
 692		sl811->irq_enable = SL11H_INTMASK_INSRMV;
 693		sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 694
 695		/* usbcore nukes other pending transactions on disconnect */
 696		if (sl811->active_a) {
 697			sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
 698			finish_request(sl811, sl811->active_a,
 699				container_of(sl811->active_a
 700						->hep->urb_list.next,
 701					struct urb, urb_list),
 702				-ESHUTDOWN);
 703			sl811->active_a = NULL;
 704		}
 705#ifdef	USE_B
 706		if (sl811->active_b) {
 707			sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
 708			finish_request(sl811, sl811->active_b,
 709				container_of(sl811->active_b
 710						->hep->urb_list.next,
 711					struct urb, urb_list),
 712				NULL, -ESHUTDOWN);
 713			sl811->active_b = NULL;
 714		}
 715#endif
 716
 717		/* port status seems weird until after reset, so
 718		 * force the reset and make hub_wq clean up later.
 719		 */
 720		if (irqstat & SL11H_INTMASK_RD)
 721			sl811->port1 &= ~USB_PORT_STAT_CONNECTION;
 722		else
 723			sl811->port1 |= USB_PORT_STAT_CONNECTION;
 724
 725		sl811->port1 |= USB_PORT_STAT_C_CONNECTION << 16;
 726
 727	} else if (irqstat & SL11H_INTMASK_RD) {
 728		if (sl811->port1 & USB_PORT_STAT_SUSPEND) {
 729			dev_dbg(hcd->self.controller, "wakeup\n");
 730			sl811->port1 |= USB_PORT_STAT_C_SUSPEND << 16;
 731			sl811->stat_wake++;
 732		} else
 733			irqstat &= ~SL11H_INTMASK_RD;
 734	}
 735
 736	if (irqstat) {
 737		if (sl811->port1 & USB_PORT_STAT_ENABLE)
 738			start_transfer(sl811);
 739		ret = IRQ_HANDLED;
 740		if (retries--)
 741			goto retry;
 742	}
 743
 744	if (sl811->periodic_count == 0 && list_empty(&sl811->async))
 745		sofirq_off(sl811);
 746	sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 747
 748	spin_unlock(&sl811->lock);
 749
 750	return ret;
 751}
 752
 753/*-------------------------------------------------------------------------*/
 754
 755/* usb 1.1 says max 90% of a frame is available for periodic transfers.
 756 * this driver doesn't promise that much since it's got to handle an
 757 * IRQ per packet; irq handling latencies also use up that time.
 758 *
 759 * NOTE:  the periodic schedule is a sparse tree, with the load for
 760 * each branch minimized.  see fig 3.5 in the OHCI spec for example.
 761 */
 762#define	MAX_PERIODIC_LOAD	500	/* out of 1000 usec */
 763
 764static int balance(struct sl811 *sl811, u16 period, u16 load)
 765{
 766	int	i, branch = -ENOSPC;
 767
 768	/* search for the least loaded schedule branch of that period
 769	 * which has enough bandwidth left unreserved.
 770	 */
 771	for (i = 0; i < period ; i++) {
 772		if (branch < 0 || sl811->load[branch] > sl811->load[i]) {
 773			int	j;
 774
 775			for (j = i; j < PERIODIC_SIZE; j += period) {
 776				if ((sl811->load[j] + load)
 777						> MAX_PERIODIC_LOAD)
 778					break;
 779			}
 780			if (j < PERIODIC_SIZE)
 781				continue;
 782			branch = i;
 783		}
 784	}
 785	return branch;
 786}
 787
 788/*-------------------------------------------------------------------------*/
 789
 790static int sl811h_urb_enqueue(
 791	struct usb_hcd		*hcd,
 792	struct urb		*urb,
 793	gfp_t			mem_flags
 794) {
 795	struct sl811		*sl811 = hcd_to_sl811(hcd);
 796	struct usb_device	*udev = urb->dev;
 797	unsigned int		pipe = urb->pipe;
 798	int			is_out = !usb_pipein(pipe);
 799	int			type = usb_pipetype(pipe);
 800	int			epnum = usb_pipeendpoint(pipe);
 801	struct sl811h_ep	*ep = NULL;
 802	unsigned long		flags;
 803	int			i;
 804	int			retval;
 805	struct usb_host_endpoint	*hep = urb->ep;
 806
 807#ifndef CONFIG_USB_SL811_HCD_ISO
 808	if (type == PIPE_ISOCHRONOUS)
 809		return -ENOSPC;
 810#endif
 811
 812	/* avoid all allocations within spinlocks */
 813	if (!hep->hcpriv) {
 814		ep = kzalloc(sizeof *ep, mem_flags);
 815		if (ep == NULL)
 816			return -ENOMEM;
 817	}
 818
 819	spin_lock_irqsave(&sl811->lock, flags);
 820
 821	/* don't submit to a dead or disabled port */
 822	if (!(sl811->port1 & USB_PORT_STAT_ENABLE)
 823			|| !HC_IS_RUNNING(hcd->state)) {
 824		retval = -ENODEV;
 825		kfree(ep);
 826		goto fail_not_linked;
 827	}
 828	retval = usb_hcd_link_urb_to_ep(hcd, urb);
 829	if (retval) {
 830		kfree(ep);
 831		goto fail_not_linked;
 832	}
 833
 834	if (hep->hcpriv) {
 835		kfree(ep);
 836		ep = hep->hcpriv;
 837	} else if (!ep) {
 838		retval = -ENOMEM;
 839		goto fail;
 840
 841	} else {
 842		INIT_LIST_HEAD(&ep->schedule);
 843		ep->udev = udev;
 844		ep->epnum = epnum;
 845		ep->maxpacket = usb_maxpacket(udev, urb->pipe);
 846		ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE;
 847		usb_settoggle(udev, epnum, is_out, 0);
 848
 849		if (type == PIPE_CONTROL)
 850			ep->nextpid = USB_PID_SETUP;
 851		else if (is_out)
 852			ep->nextpid = USB_PID_OUT;
 853		else
 854			ep->nextpid = USB_PID_IN;
 855
 856		if (ep->maxpacket > H_MAXPACKET) {
 857			/* iso packets up to 240 bytes could work... */
 858			dev_dbg(hcd->self.controller,
 859				"dev %d ep%d maxpacket %d\n", udev->devnum,
 860				epnum, ep->maxpacket);
 861			retval = -EINVAL;
 862			kfree(ep);
 863			goto fail;
 864		}
 865
 866		if (udev->speed == USB_SPEED_LOW) {
 867			/* send preamble for external hub? */
 868			if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD))
 869				ep->defctrl |= SL11H_HCTLMASK_PREAMBLE;
 870		}
 871		switch (type) {
 872		case PIPE_ISOCHRONOUS:
 873		case PIPE_INTERRUPT:
 874			if (urb->interval > PERIODIC_SIZE)
 875				urb->interval = PERIODIC_SIZE;
 876			ep->period = urb->interval;
 877			ep->branch = PERIODIC_SIZE;
 878			if (type == PIPE_ISOCHRONOUS)
 879				ep->defctrl |= SL11H_HCTLMASK_ISOCH;
 880			ep->load = usb_calc_bus_time(udev->speed, !is_out,
 881						     type == PIPE_ISOCHRONOUS,
 882						     usb_maxpacket(udev, pipe))
 883					/ 1000;
 884			break;
 885		}
 886
 887		ep->hep = hep;
 888		hep->hcpriv = ep;
 889	}
 890
 891	/* maybe put endpoint into schedule */
 892	switch (type) {
 893	case PIPE_CONTROL:
 894	case PIPE_BULK:
 895		if (list_empty(&ep->schedule))
 896			list_add_tail(&ep->schedule, &sl811->async);
 897		break;
 898	case PIPE_ISOCHRONOUS:
 899	case PIPE_INTERRUPT:
 900		urb->interval = ep->period;
 901		if (ep->branch < PERIODIC_SIZE) {
 902			/* NOTE:  the phase is correct here, but the value
 903			 * needs offsetting by the transfer queue depth.
 904			 * All current drivers ignore start_frame, so this
 905			 * is unlikely to ever matter...
 906			 */
 907			urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
 908						+ ep->branch;
 909			break;
 910		}
 911
 912		retval = balance(sl811, ep->period, ep->load);
 913		if (retval < 0)
 914			goto fail;
 915		ep->branch = retval;
 916		retval = 0;
 917		urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
 918					+ ep->branch;
 919
 920		/* sort each schedule branch by period (slow before fast)
 921		 * to share the faster parts of the tree without needing
 922		 * dummy/placeholder nodes
 923		 */
 924		dev_dbg(hcd->self.controller, "schedule qh%d/%p branch %d\n",
 925			ep->period, ep, ep->branch);
 926		for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
 927			struct sl811h_ep	**prev = &sl811->periodic[i];
 928			struct sl811h_ep	*here = *prev;
 929
 930			while (here && ep != here) {
 931				if (ep->period > here->period)
 932					break;
 933				prev = &here->next;
 934				here = *prev;
 935			}
 936			if (ep != here) {
 937				ep->next = here;
 938				*prev = ep;
 939			}
 940			sl811->load[i] += ep->load;
 941		}
 942		sl811->periodic_count++;
 943		hcd->self.bandwidth_allocated += ep->load / ep->period;
 944		sofirq_on(sl811);
 945	}
 946
 947	urb->hcpriv = hep;
 948	start_transfer(sl811);
 949	sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 950fail:
 951	if (retval)
 952		usb_hcd_unlink_urb_from_ep(hcd, urb);
 953fail_not_linked:
 954	spin_unlock_irqrestore(&sl811->lock, flags);
 955	return retval;
 956}
 957
 958static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 959{
 960	struct sl811		*sl811 = hcd_to_sl811(hcd);
 961	struct usb_host_endpoint *hep;
 962	unsigned long		flags;
 963	struct sl811h_ep	*ep;
 964	int			retval;
 965
 966	spin_lock_irqsave(&sl811->lock, flags);
 967	retval = usb_hcd_check_unlink_urb(hcd, urb, status);
 968	if (retval)
 969		goto fail;
 970
 971	hep = urb->hcpriv;
 972	ep = hep->hcpriv;
 973	if (ep) {
 974		/* finish right away if this urb can't be active ...
 975		 * note that some drivers wrongly expect delays
 976		 */
 977		if (ep->hep->urb_list.next != &urb->urb_list) {
 978			/* not front of queue?  never active */
 979
 980		/* for active transfers, we expect an IRQ */
 981		} else if (sl811->active_a == ep) {
 982			if (time_before_eq(sl811->jiffies_a, jiffies)) {
 983				/* happens a lot with lowspeed?? */
 984				dev_dbg(hcd->self.controller,
 985					"giveup on DONE_A: ctrl %02x sts %02x\n",
 986					sl811_read(sl811,
 987						SL811_EP_A(SL11H_HOSTCTLREG)),
 988					sl811_read(sl811,
 989						SL811_EP_A(SL11H_PKTSTATREG)));
 990				sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
 991						0);
 992				sl811->active_a = NULL;
 993			} else
 994				urb = NULL;
 995#ifdef	USE_B
 996		} else if (sl811->active_b == ep) {
 997			if (time_before_eq(sl811->jiffies_a, jiffies)) {
 998				/* happens a lot with lowspeed?? */
 999				dev_dbg(hcd->self.controller,
1000					"giveup on DONE_B: ctrl %02x sts %02x\n",
1001					sl811_read(sl811,
1002						SL811_EP_B(SL11H_HOSTCTLREG)),
1003					sl811_read(sl811,
1004						SL811_EP_B(SL11H_PKTSTATREG)));
1005				sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG),
1006						0);
1007				sl811->active_b = NULL;
1008			} else
1009				urb = NULL;
1010#endif
1011		} else {
1012			/* front of queue for inactive endpoint */
1013		}
1014
1015		if (urb)
1016			finish_request(sl811, ep, urb, 0);
1017		else
1018			dev_dbg(sl811_to_hcd(sl811)->self.controller,
1019				"dequeue, urb %p active %s; wait4irq\n", urb,
1020				(sl811->active_a == ep) ? "A" : "B");
1021	} else
1022		retval = -EINVAL;
1023 fail:
1024	spin_unlock_irqrestore(&sl811->lock, flags);
1025	return retval;
1026}
1027
1028static void
1029sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
1030{
1031	struct sl811h_ep	*ep = hep->hcpriv;
1032
1033	if (!ep)
1034		return;
1035
1036	/* assume we'd just wait for the irq */
1037	if (!list_empty(&hep->urb_list))
1038		msleep(3);
1039	if (!list_empty(&hep->urb_list))
1040		dev_warn(hcd->self.controller, "ep %p not empty?\n", ep);
1041
1042	kfree(ep);
1043	hep->hcpriv = NULL;
1044}
1045
1046static int
1047sl811h_get_frame(struct usb_hcd *hcd)
1048{
1049	struct sl811 *sl811 = hcd_to_sl811(hcd);
1050
1051	/* wrong except while periodic transfers are scheduled;
1052	 * never matches the on-the-wire frame;
1053	 * subject to overruns.
1054	 */
1055	return sl811->frame;
1056}
1057
1058
1059/*-------------------------------------------------------------------------*/
1060
1061/* the virtual root hub timer IRQ checks for hub status */
1062static int
1063sl811h_hub_status_data(struct usb_hcd *hcd, char *buf)
1064{
1065	struct sl811 *sl811 = hcd_to_sl811(hcd);
1066#ifdef	QUIRK3
1067	unsigned long flags;
1068
1069	/* non-SMP HACK: use root hub timer as i/o watchdog
1070	 * this seems essential when SOF IRQs aren't in use...
1071	 */
1072	local_irq_save(flags);
1073	if (!timer_pending(&sl811->timer)) {
1074		if (sl811h_irq( /* ~0, */ hcd) != IRQ_NONE)
1075			sl811->stat_lost++;
1076	}
1077	local_irq_restore(flags);
1078#endif
1079
1080	if (!(sl811->port1 & (0xffff << 16)))
1081		return 0;
1082
1083	/* tell hub_wq port 1 changed */
1084	*buf = (1 << 1);
1085	return 1;
1086}
1087
1088static void
1089sl811h_hub_descriptor (
1090	struct sl811			*sl811,
1091	struct usb_hub_descriptor	*desc
1092) {
1093	u16		temp = 0;
1094
1095	desc->bDescriptorType = USB_DT_HUB;
1096	desc->bHubContrCurrent = 0;
1097
1098	desc->bNbrPorts = 1;
1099	desc->bDescLength = 9;
1100
1101	/* per-port power switching (gang of one!), or none */
1102	desc->bPwrOn2PwrGood = 0;
1103	if (sl811->board && sl811->board->port_power) {
1104		desc->bPwrOn2PwrGood = sl811->board->potpg;
1105		if (!desc->bPwrOn2PwrGood)
1106			desc->bPwrOn2PwrGood = 10;
1107		temp = HUB_CHAR_INDV_PORT_LPSM;
1108	} else
1109		temp = HUB_CHAR_NO_LPSM;
1110
1111	/* no overcurrent errors detection/handling */
1112	temp |= HUB_CHAR_NO_OCPM;
1113
1114	desc->wHubCharacteristics = cpu_to_le16(temp);
1115
1116	/* ports removable, and legacy PortPwrCtrlMask */
1117	desc->u.hs.DeviceRemovable[0] = 0 << 1;
1118	desc->u.hs.DeviceRemovable[1] = ~0;
1119}
1120
1121static void
1122sl811h_timer(struct timer_list *t)
1123{
1124	struct sl811 	*sl811 = from_timer(sl811, t, timer);
1125	unsigned long	flags;
1126	u8		irqstat;
1127	u8		signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE;
1128	const u32	mask = USB_PORT_STAT_CONNECTION
1129				| USB_PORT_STAT_ENABLE
1130				| USB_PORT_STAT_LOW_SPEED;
1131
1132	spin_lock_irqsave(&sl811->lock, flags);
1133
1134	/* stop special signaling */
1135	sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE;
1136	sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1137	udelay(3);
1138
1139	irqstat = sl811_read(sl811, SL11H_IRQ_STATUS);
1140
1141	switch (signaling) {
1142	case SL11H_CTL1MASK_SE0:
1143		dev_dbg(sl811_to_hcd(sl811)->self.controller, "end reset\n");
1144		sl811->port1 = (USB_PORT_STAT_C_RESET << 16)
1145				 | USB_PORT_STAT_POWER;
1146		sl811->ctrl1 = 0;
1147		/* don't wrongly ack RD */
1148		if (irqstat & SL11H_INTMASK_INSRMV)
1149			irqstat &= ~SL11H_INTMASK_RD;
1150		break;
1151	case SL11H_CTL1MASK_K:
1152		dev_dbg(sl811_to_hcd(sl811)->self.controller, "end resume\n");
1153		sl811->port1 &= ~USB_PORT_STAT_SUSPEND;
1154		break;
1155	default:
1156		dev_dbg(sl811_to_hcd(sl811)->self.controller,
1157			"odd timer signaling: %02x\n", signaling);
1158		break;
1159	}
1160	sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
1161
1162	if (irqstat & SL11H_INTMASK_RD) {
1163		/* usbcore nukes all pending transactions on disconnect */
1164		if (sl811->port1 & USB_PORT_STAT_CONNECTION)
1165			sl811->port1 |= (USB_PORT_STAT_C_CONNECTION << 16)
1166					| (USB_PORT_STAT_C_ENABLE << 16);
1167		sl811->port1 &= ~mask;
1168		sl811->irq_enable = SL11H_INTMASK_INSRMV;
1169	} else {
1170		sl811->port1 |= mask;
1171		if (irqstat & SL11H_INTMASK_DP)
1172			sl811->port1 &= ~USB_PORT_STAT_LOW_SPEED;
1173		sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD;
1174	}
1175
1176	if (sl811->port1 & USB_PORT_STAT_CONNECTION) {
1177		u8	ctrl2 = SL811HS_CTL2_INIT;
1178
1179		sl811->irq_enable |= SL11H_INTMASK_DONE_A;
1180#ifdef USE_B
1181		sl811->irq_enable |= SL11H_INTMASK_DONE_B;
1182#endif
1183		if (sl811->port1 & USB_PORT_STAT_LOW_SPEED) {
1184			sl811->ctrl1 |= SL11H_CTL1MASK_LSPD;
1185			ctrl2 |= SL811HS_CTL2MASK_DSWAP;
1186		}
1187
1188		/* start SOFs flowing, kickstarting with A registers */
1189		sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA;
1190		sl811_write(sl811, SL11H_SOFLOWREG, 0xe0);
1191		sl811_write(sl811, SL811HS_CTLREG2, ctrl2);
1192
1193		/* autoincrementing */
1194		sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0);
1195		writeb(SL_SOF, sl811->data_reg);
1196		writeb(0, sl811->data_reg);
1197		sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1198				SL11H_HCTLMASK_ARM);
1199
1200		/* hub_wq provides debounce delay */
1201	} else {
1202		sl811->ctrl1 = 0;
1203	}
1204	sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1205
1206	/* reenable irqs */
1207	sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
1208	spin_unlock_irqrestore(&sl811->lock, flags);
1209}
1210
1211static int
1212sl811h_hub_control(
1213	struct usb_hcd	*hcd,
1214	u16		typeReq,
1215	u16		wValue,
1216	u16		wIndex,
1217	char		*buf,
1218	u16		wLength
1219) {
1220	struct sl811	*sl811 = hcd_to_sl811(hcd);
1221	int		retval = 0;
1222	unsigned long	flags;
1223
1224	spin_lock_irqsave(&sl811->lock, flags);
1225
1226	switch (typeReq) {
1227	case ClearHubFeature:
1228	case SetHubFeature:
1229		switch (wValue) {
1230		case C_HUB_OVER_CURRENT:
1231		case C_HUB_LOCAL_POWER:
1232			break;
1233		default:
1234			goto error;
1235		}
1236		break;
1237	case ClearPortFeature:
1238		if (wIndex != 1 || wLength != 0)
1239			goto error;
1240
1241		switch (wValue) {
1242		case USB_PORT_FEAT_ENABLE:
1243			sl811->port1 &= USB_PORT_STAT_POWER;
1244			sl811->ctrl1 = 0;
1245			sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1246			sl811->irq_enable = SL11H_INTMASK_INSRMV;
1247			sl811_write(sl811, SL11H_IRQ_ENABLE,
1248						sl811->irq_enable);
1249			break;
1250		case USB_PORT_FEAT_SUSPEND:
1251			if (!(sl811->port1 & USB_PORT_STAT_SUSPEND))
1252				break;
1253
1254			/* 20 msec of resume/K signaling, other irqs blocked */
1255			dev_dbg(hcd->self.controller, "start resume...\n");
1256			sl811->irq_enable = 0;
1257			sl811_write(sl811, SL11H_IRQ_ENABLE,
1258						sl811->irq_enable);
1259			sl811->ctrl1 |= SL11H_CTL1MASK_K;
1260			sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1261
1262			mod_timer(&sl811->timer, jiffies
1263					+ msecs_to_jiffies(USB_RESUME_TIMEOUT));
1264			break;
1265		case USB_PORT_FEAT_POWER:
1266			port_power(sl811, 0);
1267			break;
1268		case USB_PORT_FEAT_C_ENABLE:
1269		case USB_PORT_FEAT_C_SUSPEND:
1270		case USB_PORT_FEAT_C_CONNECTION:
1271		case USB_PORT_FEAT_C_OVER_CURRENT:
1272		case USB_PORT_FEAT_C_RESET:
1273			break;
1274		default:
1275			goto error;
1276		}
1277		sl811->port1 &= ~(1 << wValue);
1278		break;
1279	case GetHubDescriptor:
1280		sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf);
1281		break;
1282	case GetHubStatus:
1283		put_unaligned_le32(0, buf);
1284		break;
1285	case GetPortStatus:
1286		if (wIndex != 1)
1287			goto error;
1288		put_unaligned_le32(sl811->port1, buf);
1289
1290		if (__is_defined(VERBOSE) ||
1291		    *(u16*)(buf+2)) /* only if wPortChange is interesting */
1292			dev_dbg(hcd->self.controller, "GetPortStatus %08x\n",
1293				sl811->port1);
1294		break;
1295	case SetPortFeature:
1296		if (wIndex != 1 || wLength != 0)
1297			goto error;
1298		switch (wValue) {
1299		case USB_PORT_FEAT_SUSPEND:
1300			if (sl811->port1 & USB_PORT_STAT_RESET)
1301				goto error;
1302			if (!(sl811->port1 & USB_PORT_STAT_ENABLE))
1303				goto error;
1304
1305			dev_dbg(hcd->self.controller,"suspend...\n");
1306			sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA;
1307			sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1308			break;
1309		case USB_PORT_FEAT_POWER:
1310			port_power(sl811, 1);
1311			break;
1312		case USB_PORT_FEAT_RESET:
1313			if (sl811->port1 & USB_PORT_STAT_SUSPEND)
1314				goto error;
1315			if (!(sl811->port1 & USB_PORT_STAT_POWER))
1316				break;
1317
1318			/* 50 msec of reset/SE0 signaling, irqs blocked */
1319			sl811->irq_enable = 0;
1320			sl811_write(sl811, SL11H_IRQ_ENABLE,
1321						sl811->irq_enable);
1322			sl811->ctrl1 = SL11H_CTL1MASK_SE0;
1323			sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1324			sl811->port1 |= USB_PORT_STAT_RESET;
1325			mod_timer(&sl811->timer, jiffies
1326					+ msecs_to_jiffies(50));
1327			break;
1328		default:
1329			goto error;
1330		}
1331		sl811->port1 |= 1 << wValue;
1332		break;
1333
1334	default:
1335error:
1336		/* "protocol stall" on error */
1337		retval = -EPIPE;
1338	}
1339
1340	spin_unlock_irqrestore(&sl811->lock, flags);
1341	return retval;
1342}
1343
1344#ifdef	CONFIG_PM
1345
1346static int
1347sl811h_bus_suspend(struct usb_hcd *hcd)
1348{
1349	// SOFs off
1350	dev_dbg(hcd->self.controller, "%s\n", __func__);
1351	return 0;
1352}
1353
1354static int
1355sl811h_bus_resume(struct usb_hcd *hcd)
1356{
1357	// SOFs on
1358	dev_dbg(hcd->self.controller, "%s\n", __func__);
1359	return 0;
1360}
1361
1362#else
1363
1364#define	sl811h_bus_suspend	NULL
1365#define	sl811h_bus_resume	NULL
1366
1367#endif
1368
1369
1370/*-------------------------------------------------------------------------*/
1371
1372static void dump_irq(struct seq_file *s, char *label, u8 mask)
1373{
1374	seq_printf(s, "%s %02x%s%s%s%s%s%s\n", label, mask,
1375		(mask & SL11H_INTMASK_DONE_A) ? " done_a" : "",
1376		(mask & SL11H_INTMASK_DONE_B) ? " done_b" : "",
1377		(mask & SL11H_INTMASK_SOFINTR) ? " sof" : "",
1378		(mask & SL11H_INTMASK_INSRMV) ? " ins/rmv" : "",
1379		(mask & SL11H_INTMASK_RD) ? " rd" : "",
1380		(mask & SL11H_INTMASK_DP) ? " dp" : "");
1381}
1382
1383static int sl811h_debug_show(struct seq_file *s, void *unused)
1384{
1385	struct sl811		*sl811 = s->private;
1386	struct sl811h_ep	*ep;
1387	unsigned		i;
1388
1389	seq_printf(s, "%s\n%s version %s\nportstatus[1] = %08x\n",
1390		sl811_to_hcd(sl811)->product_desc,
1391		hcd_name, DRIVER_VERSION,
1392		sl811->port1);
1393
1394	seq_printf(s, "insert/remove: %ld\n", sl811->stat_insrmv);
1395	seq_printf(s, "current session:  done_a %ld done_b %ld "
1396			"wake %ld sof %ld overrun %ld lost %ld\n\n",
1397		sl811->stat_a, sl811->stat_b,
1398		sl811->stat_wake, sl811->stat_sof,
1399		sl811->stat_overrun, sl811->stat_lost);
1400
1401	spin_lock_irq(&sl811->lock);
1402
1403	if (sl811->ctrl1 & SL11H_CTL1MASK_SUSPEND)
1404		seq_printf(s, "(suspended)\n\n");
1405	else {
1406		u8	t = sl811_read(sl811, SL11H_CTLREG1);
1407
1408		seq_printf(s, "ctrl1 %02x%s%s%s%s\n", t,
1409			(t & SL11H_CTL1MASK_SOF_ENA) ? " sofgen" : "",
1410			({char *s; switch (t & SL11H_CTL1MASK_FORCE) {
1411			case SL11H_CTL1MASK_NORMAL: s = ""; break;
1412			case SL11H_CTL1MASK_SE0: s = " se0/reset"; break;
1413			case SL11H_CTL1MASK_K: s = " k/resume"; break;
1414			default: s = "j"; break;
1415			} s; }),
1416			(t & SL11H_CTL1MASK_LSPD) ? " lowspeed" : "",
1417			(t & SL11H_CTL1MASK_SUSPEND) ? " suspend" : "");
1418
1419		dump_irq(s, "irq_enable",
1420				sl811_read(sl811, SL11H_IRQ_ENABLE));
1421		dump_irq(s, "irq_status",
1422				sl811_read(sl811, SL11H_IRQ_STATUS));
1423		seq_printf(s, "frame clocks remaining:  %d\n",
1424				sl811_read(sl811, SL11H_SOFTMRREG) << 6);
1425	}
1426
1427	seq_printf(s, "A: qh%p ctl %02x sts %02x\n", sl811->active_a,
1428		sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)),
1429		sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
1430	seq_printf(s, "B: qh%p ctl %02x sts %02x\n", sl811->active_b,
1431		sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)),
1432		sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
1433	seq_printf(s, "\n");
1434	list_for_each_entry (ep, &sl811->async, schedule) {
1435		struct urb		*urb;
1436
1437		seq_printf(s, "%s%sqh%p, ep%d%s, maxpacket %d"
1438					" nak %d err %d\n",
1439			(ep == sl811->active_a) ? "(A) " : "",
1440			(ep == sl811->active_b) ? "(B) " : "",
1441			ep, ep->epnum,
1442			({ char *s; switch (ep->nextpid) {
1443			case USB_PID_IN: s = "in"; break;
1444			case USB_PID_OUT: s = "out"; break;
1445			case USB_PID_SETUP: s = "setup"; break;
1446			case USB_PID_ACK: s = "status"; break;
1447			default: s = "?"; break;
1448			} s;}),
1449			ep->maxpacket,
1450			ep->nak_count, ep->error_count);
1451		list_for_each_entry (urb, &ep->hep->urb_list, urb_list) {
1452			seq_printf(s, "  urb%p, %d/%d\n", urb,
1453				urb->actual_length,
1454				urb->transfer_buffer_length);
1455		}
1456	}
1457	if (!list_empty(&sl811->async))
1458		seq_printf(s, "\n");
1459
1460	seq_printf(s, "periodic size= %d\n", PERIODIC_SIZE);
1461
1462	for (i = 0; i < PERIODIC_SIZE; i++) {
1463		ep = sl811->periodic[i];
1464		if (!ep)
1465			continue;
1466		seq_printf(s, "%2d [%3d]:\n", i, sl811->load[i]);
1467
1468		/* DUMB: prints shared entries multiple times */
1469		do {
1470			seq_printf(s,
1471				"   %s%sqh%d/%p (%sdev%d ep%d%s max %d) "
1472					"err %d\n",
1473				(ep == sl811->active_a) ? "(A) " : "",
1474				(ep == sl811->active_b) ? "(B) " : "",
1475				ep->period, ep,
1476				(ep->udev->speed == USB_SPEED_FULL)
1477					? "" : "ls ",
1478				ep->udev->devnum, ep->epnum,
1479				(ep->epnum == 0) ? ""
1480					: ((ep->nextpid == USB_PID_IN)
1481						? "in"
1482						: "out"),
1483				ep->maxpacket, ep->error_count);
1484			ep = ep->next;
1485		} while (ep);
1486	}
1487
1488	spin_unlock_irq(&sl811->lock);
1489	seq_printf(s, "\n");
1490
1491	return 0;
1492}
1493DEFINE_SHOW_ATTRIBUTE(sl811h_debug);
1494
1495/* expect just one sl811 per system */
1496static void create_debug_file(struct sl811 *sl811)
1497{
1498	debugfs_create_file("sl811h", S_IRUGO, usb_debug_root, sl811,
1499			    &sl811h_debug_fops);
1500}
1501
1502static void remove_debug_file(struct sl811 *sl811)
1503{
1504	debugfs_lookup_and_remove("sl811h", usb_debug_root);
1505}
1506
1507/*-------------------------------------------------------------------------*/
1508
1509static void
1510sl811h_stop(struct usb_hcd *hcd)
1511{
1512	struct sl811	*sl811 = hcd_to_sl811(hcd);
1513	unsigned long	flags;
1514
1515	del_timer_sync(&hcd->rh_timer);
1516
1517	spin_lock_irqsave(&sl811->lock, flags);
1518	port_power(sl811, 0);
1519	spin_unlock_irqrestore(&sl811->lock, flags);
1520}
1521
1522static int
1523sl811h_start(struct usb_hcd *hcd)
1524{
1525	struct sl811		*sl811 = hcd_to_sl811(hcd);
1526
1527	/* chip has been reset, VBUS power is off */
1528	hcd->state = HC_STATE_RUNNING;
1529
1530	if (sl811->board) {
1531		if (!device_can_wakeup(hcd->self.controller))
1532			device_init_wakeup(hcd->self.controller,
1533				sl811->board->can_wakeup);
1534		hcd->power_budget = sl811->board->power * 2;
1535	}
1536
1537	/* enable power and interrupts */
1538	port_power(sl811, 1);
1539
1540	return 0;
1541}
1542
1543/*-------------------------------------------------------------------------*/
1544
1545static const struct hc_driver sl811h_hc_driver = {
1546	.description =		hcd_name,
1547	.hcd_priv_size =	sizeof(struct sl811),
1548
1549	/*
1550	 * generic hardware linkage
1551	 */
1552	.irq =			sl811h_irq,
1553	.flags =		HCD_USB11 | HCD_MEMORY,
1554
1555	/* Basic lifecycle operations */
1556	.start =		sl811h_start,
1557	.stop =			sl811h_stop,
1558
1559	/*
1560	 * managing i/o requests and associated device resources
1561	 */
1562	.urb_enqueue =		sl811h_urb_enqueue,
1563	.urb_dequeue =		sl811h_urb_dequeue,
1564	.endpoint_disable =	sl811h_endpoint_disable,
1565
1566	/*
1567	 * periodic schedule support
1568	 */
1569	.get_frame_number =	sl811h_get_frame,
1570
1571	/*
1572	 * root hub support
1573	 */
1574	.hub_status_data =	sl811h_hub_status_data,
1575	.hub_control =		sl811h_hub_control,
1576	.bus_suspend =		sl811h_bus_suspend,
1577	.bus_resume =		sl811h_bus_resume,
1578};
1579
1580/*-------------------------------------------------------------------------*/
1581
1582static void
1583sl811h_remove(struct platform_device *dev)
1584{
1585	struct usb_hcd		*hcd = platform_get_drvdata(dev);
1586	struct sl811		*sl811 = hcd_to_sl811(hcd);
1587	struct resource		*res;
1588
1589	remove_debug_file(sl811);
1590	usb_remove_hcd(hcd);
1591
1592	/* some platforms may use IORESOURCE_IO */
1593	res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1594	if (res)
1595		iounmap(sl811->data_reg);
1596
1597	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1598	if (res)
1599		iounmap(sl811->addr_reg);
1600
1601	usb_put_hcd(hcd);
 
1602}
1603
1604static int
1605sl811h_probe(struct platform_device *dev)
1606{
1607	struct usb_hcd		*hcd;
1608	struct sl811		*sl811;
1609	struct resource		*addr, *data, *ires;
1610	int			irq;
1611	void __iomem		*addr_reg;
1612	void __iomem		*data_reg;
1613	int			retval;
1614	u8			tmp, ioaddr;
1615	unsigned long		irqflags;
1616
1617	if (usb_disabled())
1618		return -ENODEV;
1619
1620	/* the chip may be wired for either kind of addressing */
1621	addr = platform_get_mem_or_io(dev, 0);
1622	data = platform_get_mem_or_io(dev, 1);
1623	if (!addr || !data || resource_type(addr) != resource_type(data))
1624		return -ENODEV;
1625
1626	/* basic sanity checks first.  board-specific init logic should
1627	 * have initialized these three resources and probably board
1628	 * specific platform_data.  we don't probe for IRQs, and do only
1629	 * minimal sanity checking.
1630	 */
1631	ires = platform_get_resource(dev, IORESOURCE_IRQ, 0);
1632	if (dev->num_resources < 3 || !ires)
1633		return -ENODEV;
1634
1635	irq = ires->start;
1636	irqflags = ires->flags & IRQF_TRIGGER_MASK;
1637
1638	ioaddr = resource_type(addr) == IORESOURCE_IO;
1639	if (ioaddr) {
1640		/*
1641		 * NOTE: 64-bit resource->start is getting truncated
1642		 * to avoid compiler warning, assuming that ->start
1643		 * is always 32-bit for this case
1644		 */
1645		addr_reg = (void __iomem *) (unsigned long) addr->start;
1646		data_reg = (void __iomem *) (unsigned long) data->start;
1647	} else {
1648		addr_reg = ioremap(addr->start, 1);
1649		if (addr_reg == NULL) {
1650			retval = -ENOMEM;
1651			goto err2;
1652		}
1653
1654		data_reg = ioremap(data->start, 1);
1655		if (data_reg == NULL) {
1656			retval = -ENOMEM;
1657			goto err4;
1658		}
1659	}
1660
1661	/* allocate and initialize hcd */
1662	hcd = usb_create_hcd(&sl811h_hc_driver, &dev->dev, dev_name(&dev->dev));
1663	if (!hcd) {
1664		retval = -ENOMEM;
1665		goto err5;
1666	}
1667	hcd->rsrc_start = addr->start;
1668	sl811 = hcd_to_sl811(hcd);
1669
1670	spin_lock_init(&sl811->lock);
1671	INIT_LIST_HEAD(&sl811->async);
1672	sl811->board = dev_get_platdata(&dev->dev);
1673	timer_setup(&sl811->timer, sl811h_timer, 0);
1674	sl811->addr_reg = addr_reg;
1675	sl811->data_reg = data_reg;
1676
1677	spin_lock_irq(&sl811->lock);
1678	port_power(sl811, 0);
1679	spin_unlock_irq(&sl811->lock);
1680	msleep(200);
1681
1682	tmp = sl811_read(sl811, SL11H_HWREVREG);
1683	switch (tmp >> 4) {
1684	case 1:
1685		hcd->product_desc = "SL811HS v1.2";
1686		break;
1687	case 2:
1688		hcd->product_desc = "SL811HS v1.5";
1689		break;
1690	default:
1691		/* reject case 0, SL11S is less functional */
1692		dev_dbg(&dev->dev, "chiprev %02x\n", tmp);
1693		retval = -ENXIO;
1694		goto err6;
1695	}
1696
1697	/* The chip's IRQ is level triggered, active high.  A requirement
1698	 * for platform device setup is to cope with things like signal
1699	 * inverters (e.g. CF is active low) or working only with edge
1700	 * triggers (e.g. most ARM CPUs).  Initial driver stress testing
1701	 * was on a system with single edge triggering, so most sorts of
1702	 * triggering arrangement should work.
1703	 *
1704	 * Use resource IRQ flags if set by platform device setup.
1705	 */
1706	irqflags |= IRQF_SHARED;
1707	retval = usb_add_hcd(hcd, irq, irqflags);
1708	if (retval != 0)
1709		goto err6;
1710
1711	device_wakeup_enable(hcd->self.controller);
1712
1713	create_debug_file(sl811);
1714	return retval;
1715
1716 err6:
1717	usb_put_hcd(hcd);
1718 err5:
1719	if (!ioaddr)
1720		iounmap(data_reg);
1721 err4:
1722	if (!ioaddr)
1723		iounmap(addr_reg);
1724 err2:
1725	dev_dbg(&dev->dev, "init error, %d\n", retval);
1726	return retval;
1727}
1728
1729#ifdef	CONFIG_PM
1730
1731/* for this device there's no useful distinction between the controller
1732 * and its root hub.
1733 */
1734
1735static int
1736sl811h_suspend(struct platform_device *dev, pm_message_t state)
1737{
1738	struct usb_hcd	*hcd = platform_get_drvdata(dev);
1739	struct sl811	*sl811 = hcd_to_sl811(hcd);
1740	int		retval = 0;
1741
1742	switch (state.event) {
1743	case PM_EVENT_FREEZE:
1744		retval = sl811h_bus_suspend(hcd);
1745		break;
1746	case PM_EVENT_SUSPEND:
1747	case PM_EVENT_HIBERNATE:
1748	case PM_EVENT_PRETHAW:		/* explicitly discard hw state */
1749		port_power(sl811, 0);
1750		break;
1751	}
1752	return retval;
1753}
1754
1755static int
1756sl811h_resume(struct platform_device *dev)
1757{
1758	struct usb_hcd	*hcd = platform_get_drvdata(dev);
1759	struct sl811	*sl811 = hcd_to_sl811(hcd);
1760
1761	/* with no "check to see if VBUS is still powered" board hook,
1762	 * let's assume it'd only be powered to enable remote wakeup.
1763	 */
1764	if (!sl811->port1 || !device_can_wakeup(&hcd->self.root_hub->dev)) {
1765		sl811->port1 = 0;
1766		port_power(sl811, 1);
1767		usb_root_hub_lost_power(hcd->self.root_hub);
1768		return 0;
1769	}
1770
1771	return sl811h_bus_resume(hcd);
1772}
1773
1774#else
1775
1776#define	sl811h_suspend	NULL
1777#define	sl811h_resume	NULL
1778
1779#endif
1780
1781
1782/* this driver is exported so sl811_cs can depend on it */
1783struct platform_driver sl811h_driver = {
1784	.probe =	sl811h_probe,
1785	.remove_new =	sl811h_remove,
1786
1787	.suspend =	sl811h_suspend,
1788	.resume =	sl811h_resume,
1789	.driver = {
1790		.name =	hcd_name,
1791	},
1792};
1793EXPORT_SYMBOL(sl811h_driver);
1794
1795module_platform_driver(sl811h_driver);