2 * MAX3421 Host Controller driver for USB.
4 * Author: David Mosberger-Tang <davidm@egauge.net>
6 * (C) Copyright 2014 David Mosberger-Tang <davidm@egauge.net>
8 * MAX3421 is a chip implementing a USB 2.0 Full-/Low-Speed host
9 * controller on a SPI bus.
12 * o MAX3421E datasheet
13 * http://datasheets.maximintegrated.com/en/ds/MAX3421E.pdf
14 * o MAX3421E Programming Guide
15 * http://www.hdl.co.jp/ftpdata/utl-001/AN3785.pdf
16 * o gadget/dummy_hcd.c
17 * For USB HCD implementation.
18 * o Arduino MAX3421 driver
19 * https://github.com/felis/USB_Host_Shield_2.0/blob/master/Usb.cpp
21 * This file is licenced under the GPL v2.
23 * Important note on worst-case (full-speed) packet size constraints
24 * (See USB 2.0 Section 5.6.3 and following):
27 * - isochronous: 1023 bytes
28 * - interrupt: 64 bytes
31 * Since the MAX3421 FIFO size is 64 bytes, we do not have to work about
32 * multi-FIFO writes/reads for a single USB packet *except* for isochronous
33 * transfers. We don't support isochronous transfers at this time, so we
34 * just assume that a USB packet always fits into a single FIFO buffer.
36 * NOTE: The June 2006 version of "MAX3421E Programming Guide"
37 * (AN3785) has conflicting info for the RCVDAVIRQ bit:
39 * The description of RCVDAVIRQ says "The CPU *must* clear
40 * this IRQ bit (by writing a 1 to it) before reading the
43 * However, the earlier section on "Programming BULK-IN
44 * Transfers" says * that:
46 * After the CPU retrieves the data, it clears the
49 * The December 2006 version has been corrected and it consistently
50 * states the second behavior is the correct one.
52 * Synchronous SPI transactions sleep so we can't perform any such
53 * transactions while holding a spin-lock (and/or while interrupts are
54 * masked). To achieve this, all SPI transactions are issued from a
55 * single thread (max3421_spi_thread).
58 #include <linux/jiffies.h>
59 #include <linux/module.h>
60 #include <linux/spi/spi.h>
61 #include <linux/usb.h>
62 #include <linux/usb/hcd.h>
64 #include <linux/platform_data/max3421-hcd.h>
66 #define DRIVER_DESC "MAX3421 USB Host-Controller Driver"
67 #define DRIVER_VERSION "1.0"
69 /* 11-bit counter that wraps around (USB 2.0 Section 8.3.3): */
70 #define USB_MAX_FRAME_NUMBER 0x7ff
71 #define USB_MAX_RETRIES 3 /* # of retries before error is reported */
74 * Max. # of times we're willing to retransmit a request immediately in
75 * resposne to a NAK. Afterwards, we fall back on trying once a frame.
77 #define NAK_MAX_FAST_RETRANSMITS 2
79 #define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */
81 /* Port-change mask: */
82 #define PORT_C_MASK ((USB_PORT_STAT_C_CONNECTION | \
83 USB_PORT_STAT_C_ENABLE | \
84 USB_PORT_STAT_C_SUSPEND | \
85 USB_PORT_STAT_C_OVERCURRENT | \
86 USB_PORT_STAT_C_RESET) << 16)
88 enum max3421_rh_state {
95 PKT_STATE_SETUP, /* waiting to send setup packet to ctrl pipe */
96 PKT_STATE_TRANSFER, /* waiting to xfer transfer_buffer */
97 PKT_STATE_TERMINATE /* waiting to terminate control transfer */
100 enum scheduling_pass {
102 SCHED_PASS_NON_PERIODIC,
106 /* Bit numbers for max3421_hcd->todo: */
115 struct max3421_dma_buf {
122 struct task_struct *spi_thread;
124 struct max3421_hcd *next;
126 enum max3421_rh_state rh_state;
127 /* lower 16 bits contain port status, upper 16 bits the change mask: */
132 struct list_head ep_list; /* list of EP's with work */
135 * The following are owned by spi_thread (may be accessed by
136 * SPI-thread without acquiring the HCD lock:
138 u8 rev; /* chip revision */
141 * kmalloc'd buffers guaranteed to be in separate (DMA)
144 struct max3421_dma_buf *tx;
145 struct max3421_dma_buf *rx;
147 * URB we're currently processing. Must not be reset to NULL
148 * unless MAX3421E chip is idle:
150 struct urb *curr_urb;
151 enum scheduling_pass sched_pass;
152 int urb_done; /* > 0 -> no errors, < 0: errno */
159 unsigned long err_stat[16];
164 struct usb_host_endpoint *ep;
165 struct list_head ep_list;
167 u16 last_active; /* frame # this ep was last active */
168 enum pkt_state pkt_state;
170 u8 retransmit; /* packet needs retransmission */
173 static struct max3421_hcd *max3421_hcd_list;
175 #define MAX3421_FIFO_SIZE 64
177 #define MAX3421_SPI_DIR_RD 0 /* read register from MAX3421 */
178 #define MAX3421_SPI_DIR_WR 1 /* write register to MAX3421 */
181 #define MAX3421_SPI_DIR_SHIFT 1
182 #define MAX3421_SPI_REG_SHIFT 3
184 #define MAX3421_REG_RCVFIFO 1
185 #define MAX3421_REG_SNDFIFO 2
186 #define MAX3421_REG_SUDFIFO 4
187 #define MAX3421_REG_RCVBC 6
188 #define MAX3421_REG_SNDBC 7
189 #define MAX3421_REG_USBIRQ 13
190 #define MAX3421_REG_USBIEN 14
191 #define MAX3421_REG_USBCTL 15
192 #define MAX3421_REG_CPUCTL 16
193 #define MAX3421_REG_PINCTL 17
194 #define MAX3421_REG_REVISION 18
195 #define MAX3421_REG_IOPINS1 20
196 #define MAX3421_REG_IOPINS2 21
197 #define MAX3421_REG_GPINIRQ 22
198 #define MAX3421_REG_GPINIEN 23
199 #define MAX3421_REG_GPINPOL 24
200 #define MAX3421_REG_HIRQ 25
201 #define MAX3421_REG_HIEN 26
202 #define MAX3421_REG_MODE 27
203 #define MAX3421_REG_PERADDR 28
204 #define MAX3421_REG_HCTL 29
205 #define MAX3421_REG_HXFR 30
206 #define MAX3421_REG_HRSL 31
209 MAX3421_USBIRQ_OSCOKIRQ_BIT = 0,
210 MAX3421_USBIRQ_NOVBUSIRQ_BIT = 5,
211 MAX3421_USBIRQ_VBUSIRQ_BIT
215 MAX3421_CPUCTL_IE_BIT = 0,
216 MAX3421_CPUCTL_PULSEWID0_BIT = 6,
217 MAX3421_CPUCTL_PULSEWID1_BIT
221 MAX3421_USBCTL_PWRDOWN_BIT = 4,
222 MAX3421_USBCTL_CHIPRES_BIT
226 MAX3421_PINCTL_GPXA_BIT = 0,
227 MAX3421_PINCTL_GPXB_BIT,
228 MAX3421_PINCTL_POSINT_BIT,
229 MAX3421_PINCTL_INTLEVEL_BIT,
230 MAX3421_PINCTL_FDUPSPI_BIT,
231 MAX3421_PINCTL_EP0INAK_BIT,
232 MAX3421_PINCTL_EP2INAK_BIT,
233 MAX3421_PINCTL_EP3INAK_BIT,
237 MAX3421_HI_BUSEVENT_BIT = 0, /* bus-reset/-resume */
238 MAX3421_HI_RWU_BIT, /* remote wakeup */
239 MAX3421_HI_RCVDAV_BIT, /* receive FIFO data available */
240 MAX3421_HI_SNDBAV_BIT, /* send buffer available */
241 MAX3421_HI_SUSDN_BIT, /* suspend operation done */
242 MAX3421_HI_CONDET_BIT, /* peripheral connect/disconnect */
243 MAX3421_HI_FRAME_BIT, /* frame generator */
244 MAX3421_HI_HXFRDN_BIT, /* host transfer done */
248 MAX3421_HCTL_BUSRST_BIT = 0,
249 MAX3421_HCTL_FRMRST_BIT,
250 MAX3421_HCTL_SAMPLEBUS_BIT,
251 MAX3421_HCTL_SIGRSM_BIT,
252 MAX3421_HCTL_RCVTOG0_BIT,
253 MAX3421_HCTL_RCVTOG1_BIT,
254 MAX3421_HCTL_SNDTOG0_BIT,
255 MAX3421_HCTL_SNDTOG1_BIT
259 MAX3421_MODE_HOST_BIT = 0,
260 MAX3421_MODE_LOWSPEED_BIT,
261 MAX3421_MODE_HUBPRE_BIT,
262 MAX3421_MODE_SOFKAENAB_BIT,
263 MAX3421_MODE_SEPIRQ_BIT,
264 MAX3421_MODE_DELAYISO_BIT,
265 MAX3421_MODE_DMPULLDN_BIT,
266 MAX3421_MODE_DPPULLDN_BIT
277 MAX3421_HRSL_WRONGPID,
284 MAX3421_HRSL_TIMEOUT,
286 MAX3421_HRSL_RESULT_MASK = 0xf,
287 MAX3421_HRSL_RCVTOGRD_BIT = 4,
288 MAX3421_HRSL_SNDTOGRD_BIT,
289 MAX3421_HRSL_KSTATUS_BIT,
290 MAX3421_HRSL_JSTATUS_BIT
293 /* Return same error-codes as ohci.h:cc_to_error: */
294 static const int hrsl_to_error[] = {
295 [MAX3421_HRSL_OK] = 0,
296 [MAX3421_HRSL_BUSY] = -EINVAL,
297 [MAX3421_HRSL_BADREQ] = -EINVAL,
298 [MAX3421_HRSL_UNDEF] = -EINVAL,
299 [MAX3421_HRSL_NAK] = -EAGAIN,
300 [MAX3421_HRSL_STALL] = -EPIPE,
301 [MAX3421_HRSL_TOGERR] = -EILSEQ,
302 [MAX3421_HRSL_WRONGPID] = -EPROTO,
303 [MAX3421_HRSL_BADBC] = -EREMOTEIO,
304 [MAX3421_HRSL_PIDERR] = -EPROTO,
305 [MAX3421_HRSL_PKTERR] = -EPROTO,
306 [MAX3421_HRSL_CRCERR] = -EILSEQ,
307 [MAX3421_HRSL_KERR] = -EIO,
308 [MAX3421_HRSL_JERR] = -EIO,
309 [MAX3421_HRSL_TIMEOUT] = -ETIME,
310 [MAX3421_HRSL_BABBLE] = -EOVERFLOW
314 * See http://www.beyondlogic.org/usbnutshell/usb4.shtml#Control for a
315 * reasonable overview of how control transfers use the the IN/OUT
318 #define MAX3421_HXFR_BULK_IN(ep) (0x00 | (ep)) /* bulk or interrupt */
319 #define MAX3421_HXFR_SETUP 0x10
320 #define MAX3421_HXFR_BULK_OUT(ep) (0x20 | (ep)) /* bulk or interrupt */
321 #define MAX3421_HXFR_ISO_IN(ep) (0x40 | (ep))
322 #define MAX3421_HXFR_ISO_OUT(ep) (0x60 | (ep))
323 #define MAX3421_HXFR_HS_IN 0x80 /* handshake in */
324 #define MAX3421_HXFR_HS_OUT 0xa0 /* handshake out */
326 #define field(val, bit) ((val) << (bit))
329 frame_diff(u16 left, u16 right)
331 return ((unsigned) (left - right)) % (USB_MAX_FRAME_NUMBER + 1);
334 static inline struct max3421_hcd *
335 hcd_to_max3421(struct usb_hcd *hcd)
337 return (struct max3421_hcd *) hcd->hcd_priv;
340 static inline struct usb_hcd *
341 max3421_to_hcd(struct max3421_hcd *max3421_hcd)
343 return container_of((void *) max3421_hcd, struct usb_hcd, hcd_priv);
347 spi_rd8(struct usb_hcd *hcd, unsigned int reg)
349 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
350 struct spi_device *spi = to_spi_device(hcd->self.controller);
351 struct spi_transfer transfer;
352 struct spi_message msg;
354 memset(&transfer, 0, sizeof(transfer));
356 spi_message_init(&msg);
358 max3421_hcd->tx->data[0] =
359 (field(reg, MAX3421_SPI_REG_SHIFT) |
360 field(MAX3421_SPI_DIR_RD, MAX3421_SPI_DIR_SHIFT));
362 transfer.tx_buf = max3421_hcd->tx->data;
363 transfer.rx_buf = max3421_hcd->rx->data;
366 spi_message_add_tail(&transfer, &msg);
369 return max3421_hcd->rx->data[1];
373 spi_wr8(struct usb_hcd *hcd, unsigned int reg, u8 val)
375 struct spi_device *spi = to_spi_device(hcd->self.controller);
376 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
377 struct spi_transfer transfer;
378 struct spi_message msg;
380 memset(&transfer, 0, sizeof(transfer));
382 spi_message_init(&msg);
384 max3421_hcd->tx->data[0] =
385 (field(reg, MAX3421_SPI_REG_SHIFT) |
386 field(MAX3421_SPI_DIR_WR, MAX3421_SPI_DIR_SHIFT));
387 max3421_hcd->tx->data[1] = val;
389 transfer.tx_buf = max3421_hcd->tx->data;
392 spi_message_add_tail(&transfer, &msg);
397 spi_rd_buf(struct usb_hcd *hcd, unsigned int reg, void *buf, size_t len)
399 struct spi_device *spi = to_spi_device(hcd->self.controller);
400 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
401 struct spi_transfer transfer[2];
402 struct spi_message msg;
404 memset(transfer, 0, sizeof(transfer));
406 spi_message_init(&msg);
408 max3421_hcd->tx->data[0] =
409 (field(reg, MAX3421_SPI_REG_SHIFT) |
410 field(MAX3421_SPI_DIR_RD, MAX3421_SPI_DIR_SHIFT));
411 transfer[0].tx_buf = max3421_hcd->tx->data;
414 transfer[1].rx_buf = buf;
415 transfer[1].len = len;
417 spi_message_add_tail(&transfer[0], &msg);
418 spi_message_add_tail(&transfer[1], &msg);
423 spi_wr_buf(struct usb_hcd *hcd, unsigned int reg, void *buf, size_t len)
425 struct spi_device *spi = to_spi_device(hcd->self.controller);
426 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
427 struct spi_transfer transfer[2];
428 struct spi_message msg;
430 memset(transfer, 0, sizeof(transfer));
432 spi_message_init(&msg);
434 max3421_hcd->tx->data[0] =
435 (field(reg, MAX3421_SPI_REG_SHIFT) |
436 field(MAX3421_SPI_DIR_WR, MAX3421_SPI_DIR_SHIFT));
438 transfer[0].tx_buf = max3421_hcd->tx->data;
441 transfer[1].tx_buf = buf;
442 transfer[1].len = len;
444 spi_message_add_tail(&transfer[0], &msg);
445 spi_message_add_tail(&transfer[1], &msg);
450 * Figure out the correct setting for the LOWSPEED and HUBPRE mode
451 * bits. The HUBPRE bit needs to be set when MAX3421E operates at
452 * full speed, but it's talking to a low-speed device (i.e., through a
453 * hub). Setting that bit ensures that every low-speed packet is
454 * preceded by a full-speed PRE PID. Possible configurations:
456 * Hub speed: Device speed: => LOWSPEED bit: HUBPRE bit:
463 max3421_set_speed(struct usb_hcd *hcd, struct usb_device *dev)
465 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
466 u8 mode_lowspeed, mode_hubpre, mode = max3421_hcd->mode;
468 mode_lowspeed = BIT(MAX3421_MODE_LOWSPEED_BIT);
469 mode_hubpre = BIT(MAX3421_MODE_HUBPRE_BIT);
470 if (max3421_hcd->port_status & USB_PORT_STAT_LOW_SPEED) {
471 mode |= mode_lowspeed;
472 mode &= ~mode_hubpre;
473 } else if (dev->speed == USB_SPEED_LOW) {
474 mode |= mode_lowspeed | mode_hubpre;
476 mode &= ~(mode_lowspeed | mode_hubpre);
478 if (mode != max3421_hcd->mode) {
479 max3421_hcd->mode = mode;
480 spi_wr8(hcd, MAX3421_REG_MODE, max3421_hcd->mode);
486 * Caller must NOT hold HCD spinlock.
489 max3421_set_address(struct usb_hcd *hcd, struct usb_device *dev, int epnum)
494 /* setup new endpoint's toggle bits: */
495 rcvtog = usb_gettoggle(dev, epnum, 0);
496 sndtog = usb_gettoggle(dev, epnum, 1);
497 hctl = (BIT(rcvtog + MAX3421_HCTL_RCVTOG0_BIT) |
498 BIT(sndtog + MAX3421_HCTL_SNDTOG0_BIT));
500 spi_wr8(hcd, MAX3421_REG_HCTL, hctl);
503 * Note: devnum for one and the same device can change during
504 * address-assignment so it's best to just always load the
505 * address whenever the end-point changed/was forced.
507 spi_wr8(hcd, MAX3421_REG_PERADDR, dev->devnum);
511 max3421_ctrl_setup(struct usb_hcd *hcd, struct urb *urb)
513 spi_wr_buf(hcd, MAX3421_REG_SUDFIFO, urb->setup_packet, 8);
514 return MAX3421_HXFR_SETUP;
518 max3421_transfer_in(struct usb_hcd *hcd, struct urb *urb)
520 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
521 int epnum = usb_pipeendpoint(urb->pipe);
523 max3421_hcd->curr_len = 0;
524 max3421_hcd->hien |= BIT(MAX3421_HI_RCVDAV_BIT);
525 return MAX3421_HXFR_BULK_IN(epnum);
529 max3421_transfer_out(struct usb_hcd *hcd, struct urb *urb, int fast_retransmit)
531 struct spi_device *spi = to_spi_device(hcd->self.controller);
532 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
533 int epnum = usb_pipeendpoint(urb->pipe);
537 src = urb->transfer_buffer + urb->actual_length;
539 if (fast_retransmit) {
540 if (max3421_hcd->rev == 0x12) {
541 /* work around rev 0x12 bug: */
542 spi_wr8(hcd, MAX3421_REG_SNDBC, 0);
543 spi_wr8(hcd, MAX3421_REG_SNDFIFO, ((u8 *) src)[0]);
544 spi_wr8(hcd, MAX3421_REG_SNDBC, max3421_hcd->curr_len);
546 return MAX3421_HXFR_BULK_OUT(epnum);
549 max_packet = usb_maxpacket(urb->dev, urb->pipe, 1);
551 if (max_packet > MAX3421_FIFO_SIZE) {
553 * We do not support isochronous transfers at this
557 "%s: packet-size of %u too big (limit is %u bytes)",
558 __func__, max_packet, MAX3421_FIFO_SIZE);
559 max3421_hcd->urb_done = -EMSGSIZE;
562 max3421_hcd->curr_len = min((urb->transfer_buffer_length -
563 urb->actual_length), max_packet);
565 spi_wr_buf(hcd, MAX3421_REG_SNDFIFO, src, max3421_hcd->curr_len);
566 spi_wr8(hcd, MAX3421_REG_SNDBC, max3421_hcd->curr_len);
567 return MAX3421_HXFR_BULK_OUT(epnum);
571 * Issue the next host-transfer command.
572 * Caller must NOT hold HCD spinlock.
575 max3421_next_transfer(struct usb_hcd *hcd, int fast_retransmit)
577 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
578 struct urb *urb = max3421_hcd->curr_urb;
579 struct max3421_ep *max3421_ep;
583 return; /* nothing to do */
585 max3421_ep = urb->ep->hcpriv;
587 switch (max3421_ep->pkt_state) {
588 case PKT_STATE_SETUP:
589 cmd = max3421_ctrl_setup(hcd, urb);
592 case PKT_STATE_TRANSFER:
593 if (usb_urb_dir_in(urb))
594 cmd = max3421_transfer_in(hcd, urb);
596 cmd = max3421_transfer_out(hcd, urb, fast_retransmit);
599 case PKT_STATE_TERMINATE:
601 * IN transfers are terminated with HS_OUT token,
602 * OUT transfers with HS_IN:
604 if (usb_urb_dir_in(urb))
605 cmd = MAX3421_HXFR_HS_OUT;
607 cmd = MAX3421_HXFR_HS_IN;
614 /* issue the command and wait for host-xfer-done interrupt: */
616 spi_wr8(hcd, MAX3421_REG_HXFR, cmd);
617 max3421_hcd->hien |= BIT(MAX3421_HI_HXFRDN_BIT);
621 * Find the next URB to process and start its execution.
623 * At this time, we do not anticipate ever connecting a USB hub to the
624 * MAX3421 chip, so at most USB device can be connected and we can use
625 * a simplistic scheduler: at the start of a frame, schedule all
626 * periodic transfers. Once that is done, use the remainder of the
627 * frame to process non-periodic (bulk & control) transfers.
630 * o Caller must NOT hold HCD spinlock.
631 * o max3421_hcd->curr_urb MUST BE NULL.
632 * o MAX3421E chip must be idle.
635 max3421_select_and_start_urb(struct usb_hcd *hcd)
637 struct spi_device *spi = to_spi_device(hcd->self.controller);
638 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
639 struct urb *urb, *curr_urb = NULL;
640 struct max3421_ep *max3421_ep;
642 struct usb_host_endpoint *ep;
643 struct list_head *pos;
646 spin_lock_irqsave(&max3421_hcd->lock, flags);
649 max3421_hcd->sched_pass < SCHED_PASS_DONE;
650 ++max3421_hcd->sched_pass)
651 list_for_each(pos, &max3421_hcd->ep_list) {
653 max3421_ep = container_of(pos, struct max3421_ep,
657 switch (usb_endpoint_type(&ep->desc)) {
658 case USB_ENDPOINT_XFER_ISOC:
659 case USB_ENDPOINT_XFER_INT:
660 if (max3421_hcd->sched_pass !=
665 case USB_ENDPOINT_XFER_CONTROL:
666 case USB_ENDPOINT_XFER_BULK:
667 if (max3421_hcd->sched_pass !=
668 SCHED_PASS_NON_PERIODIC)
673 if (list_empty(&ep->urb_list))
674 continue; /* nothing to do */
675 urb = list_first_entry(&ep->urb_list, struct urb,
678 dev_dbg(&spi->dev, "%s: URB %p unlinked=%d",
679 __func__, urb, urb->unlinked);
680 max3421_hcd->curr_urb = urb;
681 max3421_hcd->urb_done = 1;
682 spin_unlock_irqrestore(&max3421_hcd->lock,
687 switch (usb_endpoint_type(&ep->desc)) {
688 case USB_ENDPOINT_XFER_CONTROL:
690 * Allow one control transaction per
691 * frame per endpoint:
693 if (frame_diff(max3421_ep->last_active,
694 max3421_hcd->frame_number) == 0)
698 case USB_ENDPOINT_XFER_BULK:
699 if (max3421_ep->retransmit
700 && (frame_diff(max3421_ep->last_active,
701 max3421_hcd->frame_number)
704 * We already tried this EP
705 * during this frame and got a
706 * NAK or error; wait for next frame
711 case USB_ENDPOINT_XFER_ISOC:
712 case USB_ENDPOINT_XFER_INT:
713 if (frame_diff(max3421_hcd->frame_number,
714 max3421_ep->last_active)
717 * We already processed this
718 * end-point in the current
725 /* move current ep to tail: */
726 list_move_tail(pos, &max3421_hcd->ep_list);
732 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
736 urb = max3421_hcd->curr_urb = curr_urb;
737 epnum = usb_endpoint_num(&urb->ep->desc);
738 if (max3421_ep->retransmit)
739 /* restart (part of) a USB transaction: */
740 max3421_ep->retransmit = 0;
742 /* start USB transaction: */
743 if (usb_endpoint_xfer_control(&ep->desc)) {
745 * See USB 2.0 spec section 8.6.1
746 * Initialization via SETUP Token:
748 usb_settoggle(urb->dev, epnum, 0, 1);
749 usb_settoggle(urb->dev, epnum, 1, 1);
750 max3421_ep->pkt_state = PKT_STATE_SETUP;
752 max3421_ep->pkt_state = PKT_STATE_TRANSFER;
755 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
757 max3421_ep->last_active = max3421_hcd->frame_number;
758 max3421_set_address(hcd, urb->dev, epnum);
759 max3421_set_speed(hcd, urb->dev);
760 max3421_next_transfer(hcd, 0);
765 * Check all endpoints for URBs that got unlinked.
767 * Caller must NOT hold HCD spinlock.
770 max3421_check_unlink(struct usb_hcd *hcd)
772 struct spi_device *spi = to_spi_device(hcd->self.controller);
773 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
774 struct list_head *pos, *upos, *next_upos;
775 struct max3421_ep *max3421_ep;
776 struct usb_host_endpoint *ep;
781 spin_lock_irqsave(&max3421_hcd->lock, flags);
782 list_for_each(pos, &max3421_hcd->ep_list) {
783 max3421_ep = container_of(pos, struct max3421_ep, ep_list);
785 list_for_each_safe(upos, next_upos, &ep->urb_list) {
786 urb = container_of(upos, struct urb, urb_list);
789 dev_dbg(&spi->dev, "%s: URB %p unlinked=%d",
790 __func__, urb, urb->unlinked);
791 usb_hcd_unlink_urb_from_ep(hcd, urb);
792 spin_unlock_irqrestore(&max3421_hcd->lock,
794 usb_hcd_giveback_urb(hcd, urb, 0);
795 spin_lock_irqsave(&max3421_hcd->lock, flags);
799 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
804 * Caller must NOT hold HCD spinlock.
807 max3421_slow_retransmit(struct usb_hcd *hcd)
809 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
810 struct urb *urb = max3421_hcd->curr_urb;
811 struct max3421_ep *max3421_ep;
813 max3421_ep = urb->ep->hcpriv;
814 max3421_ep->retransmit = 1;
815 max3421_hcd->curr_urb = NULL;
819 * Caller must NOT hold HCD spinlock.
822 max3421_recv_data_available(struct usb_hcd *hcd)
824 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
825 struct urb *urb = max3421_hcd->curr_urb;
826 size_t remaining, transfer_size;
829 rcvbc = spi_rd8(hcd, MAX3421_REG_RCVBC);
831 if (rcvbc > MAX3421_FIFO_SIZE)
832 rcvbc = MAX3421_FIFO_SIZE;
833 if (urb->actual_length >= urb->transfer_buffer_length)
836 remaining = urb->transfer_buffer_length - urb->actual_length;
837 transfer_size = rcvbc;
838 if (transfer_size > remaining)
839 transfer_size = remaining;
840 if (transfer_size > 0) {
841 void *dst = urb->transfer_buffer + urb->actual_length;
843 spi_rd_buf(hcd, MAX3421_REG_RCVFIFO, dst, transfer_size);
844 urb->actual_length += transfer_size;
845 max3421_hcd->curr_len = transfer_size;
848 /* ack the RCVDAV irq now that the FIFO has been read: */
849 spi_wr8(hcd, MAX3421_REG_HIRQ, BIT(MAX3421_HI_RCVDAV_BIT));
853 max3421_handle_error(struct usb_hcd *hcd, u8 hrsl)
855 struct spi_device *spi = to_spi_device(hcd->self.controller);
856 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
857 u8 result_code = hrsl & MAX3421_HRSL_RESULT_MASK;
858 struct urb *urb = max3421_hcd->curr_urb;
859 struct max3421_ep *max3421_ep = urb->ep->hcpriv;
863 * If an OUT command results in any response other than OK
864 * (i.e., error or NAK), we have to perform a dummy-write to
865 * SNDBC so the FIFO gets switched back to us. Otherwise, we
866 * get out of sync with the SNDFIFO double buffer.
868 switch_sndfifo = (max3421_ep->pkt_state == PKT_STATE_TRANSFER &&
869 usb_urb_dir_out(urb));
871 switch (result_code) {
872 case MAX3421_HRSL_OK:
873 return; /* this shouldn't happen */
875 case MAX3421_HRSL_WRONGPID: /* received wrong PID */
876 case MAX3421_HRSL_BUSY: /* SIE busy */
877 case MAX3421_HRSL_BADREQ: /* bad val in HXFR */
878 case MAX3421_HRSL_UNDEF: /* reserved */
879 case MAX3421_HRSL_KERR: /* K-state instead of response */
880 case MAX3421_HRSL_JERR: /* J-state instead of response */
882 * packet experienced an error that we cannot recover
885 max3421_hcd->urb_done = hrsl_to_error[result_code];
886 dev_dbg(&spi->dev, "%s: unexpected error HRSL=0x%02x",
890 case MAX3421_HRSL_TOGERR:
891 if (usb_urb_dir_in(urb))
892 ; /* don't do anything (device will switch toggle) */
894 /* flip the send toggle bit: */
895 int sndtog = (hrsl >> MAX3421_HRSL_SNDTOGRD_BIT) & 1;
898 spi_wr8(hcd, MAX3421_REG_HCTL,
899 BIT(sndtog + MAX3421_HCTL_SNDTOG0_BIT));
902 case MAX3421_HRSL_BADBC: /* bad byte count */
903 case MAX3421_HRSL_PIDERR: /* received PID is corrupted */
904 case MAX3421_HRSL_PKTERR: /* packet error (stuff, EOP) */
905 case MAX3421_HRSL_CRCERR: /* CRC error */
906 case MAX3421_HRSL_BABBLE: /* device talked too long */
907 case MAX3421_HRSL_TIMEOUT:
908 if (max3421_ep->retries++ < USB_MAX_RETRIES)
909 /* retry the packet again in the next frame */
910 max3421_slow_retransmit(hcd);
912 /* Based on ohci.h cc_to_err[]: */
913 max3421_hcd->urb_done = hrsl_to_error[result_code];
914 dev_dbg(&spi->dev, "%s: unexpected error HRSL=0x%02x",
919 case MAX3421_HRSL_STALL:
920 dev_dbg(&spi->dev, "%s: unexpected error HRSL=0x%02x",
922 max3421_hcd->urb_done = hrsl_to_error[result_code];
925 case MAX3421_HRSL_NAK:
927 * Device wasn't ready for data or has no data
928 * available: retry the packet again.
930 if (max3421_ep->naks++ < NAK_MAX_FAST_RETRANSMITS) {
931 max3421_next_transfer(hcd, 1);
934 max3421_slow_retransmit(hcd);
938 spi_wr8(hcd, MAX3421_REG_SNDBC, 0);
942 * Caller must NOT hold HCD spinlock.
945 max3421_transfer_in_done(struct usb_hcd *hcd, struct urb *urb)
947 struct spi_device *spi = to_spi_device(hcd->self.controller);
948 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
951 if (urb->actual_length >= urb->transfer_buffer_length)
952 return 1; /* read is complete, so we're done */
955 * USB 2.0 Section 5.3.2 Pipes: packets must be full size
956 * except for last one.
958 max_packet = usb_maxpacket(urb->dev, urb->pipe, 0);
959 if (max_packet > MAX3421_FIFO_SIZE) {
961 * We do not support isochronous transfers at this
965 "%s: packet-size of %u too big (limit is %u bytes)",
966 __func__, max_packet, MAX3421_FIFO_SIZE);
970 if (max3421_hcd->curr_len < max_packet) {
971 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
973 * remaining > 0 and received an
974 * unexpected partial packet ->
979 /* short read, but it's OK */
982 return 0; /* not done */
986 * Caller must NOT hold HCD spinlock.
989 max3421_transfer_out_done(struct usb_hcd *hcd, struct urb *urb)
991 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
993 urb->actual_length += max3421_hcd->curr_len;
994 if (urb->actual_length < urb->transfer_buffer_length)
996 if (urb->transfer_flags & URB_ZERO_PACKET) {
998 * Some hardware needs a zero-size packet at the end
999 * of a bulk-out transfer if the last transfer was a
1000 * full-sized packet (i.e., such hardware use <
1001 * max_packet as an indicator that the end of the
1002 * packet has been reached).
1004 u32 max_packet = usb_maxpacket(urb->dev, urb->pipe, 1);
1006 if (max3421_hcd->curr_len == max_packet)
1013 * Caller must NOT hold HCD spinlock.
1016 max3421_host_transfer_done(struct usb_hcd *hcd)
1018 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1019 struct urb *urb = max3421_hcd->curr_urb;
1020 struct max3421_ep *max3421_ep;
1021 u8 result_code, hrsl;
1024 max3421_hcd->hien &= ~(BIT(MAX3421_HI_HXFRDN_BIT) |
1025 BIT(MAX3421_HI_RCVDAV_BIT));
1027 hrsl = spi_rd8(hcd, MAX3421_REG_HRSL);
1028 result_code = hrsl & MAX3421_HRSL_RESULT_MASK;
1031 ++max3421_hcd->err_stat[result_code];
1034 max3421_ep = urb->ep->hcpriv;
1036 if (unlikely(result_code != MAX3421_HRSL_OK)) {
1037 max3421_handle_error(hcd, hrsl);
1041 max3421_ep->naks = 0;
1042 max3421_ep->retries = 0;
1043 switch (max3421_ep->pkt_state) {
1045 case PKT_STATE_SETUP:
1046 if (urb->transfer_buffer_length > 0)
1047 max3421_ep->pkt_state = PKT_STATE_TRANSFER;
1049 max3421_ep->pkt_state = PKT_STATE_TERMINATE;
1052 case PKT_STATE_TRANSFER:
1053 if (usb_urb_dir_in(urb))
1054 urb_done = max3421_transfer_in_done(hcd, urb);
1056 urb_done = max3421_transfer_out_done(hcd, urb);
1057 if (urb_done > 0 && usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1059 * We aren't really done - we still need to
1060 * terminate the control transfer:
1062 max3421_hcd->urb_done = urb_done = 0;
1063 max3421_ep->pkt_state = PKT_STATE_TERMINATE;
1067 case PKT_STATE_TERMINATE:
1073 max3421_hcd->urb_done = urb_done;
1075 max3421_next_transfer(hcd, 0);
1079 * Caller must NOT hold HCD spinlock.
1082 max3421_detect_conn(struct usb_hcd *hcd)
1084 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1085 unsigned int jk, have_conn = 0;
1086 u32 old_port_status, chg;
1087 unsigned long flags;
1090 hrsl = spi_rd8(hcd, MAX3421_REG_HRSL);
1092 jk = ((((hrsl >> MAX3421_HRSL_JSTATUS_BIT) & 1) << 0) |
1093 (((hrsl >> MAX3421_HRSL_KSTATUS_BIT) & 1) << 1));
1095 mode = max3421_hcd->mode;
1098 case 0x0: /* SE0: disconnect */
1100 * Turn off SOFKAENAB bit to avoid getting interrupt
1101 * every milli-second:
1103 mode &= ~BIT(MAX3421_MODE_SOFKAENAB_BIT);
1106 case 0x1: /* J=0,K=1: low-speed (in full-speed or vice versa) */
1107 case 0x2: /* J=1,K=0: full-speed (in full-speed or vice versa) */
1109 /* need to switch to the other speed: */
1110 mode ^= BIT(MAX3421_MODE_LOWSPEED_BIT);
1111 /* turn on SOFKAENAB bit: */
1112 mode |= BIT(MAX3421_MODE_SOFKAENAB_BIT);
1116 case 0x3: /* illegal */
1120 max3421_hcd->mode = mode;
1121 spi_wr8(hcd, MAX3421_REG_MODE, max3421_hcd->mode);
1123 spin_lock_irqsave(&max3421_hcd->lock, flags);
1124 old_port_status = max3421_hcd->port_status;
1126 max3421_hcd->port_status |= USB_PORT_STAT_CONNECTION;
1128 max3421_hcd->port_status &= ~USB_PORT_STAT_CONNECTION;
1129 if (mode & BIT(MAX3421_MODE_LOWSPEED_BIT))
1130 max3421_hcd->port_status |= USB_PORT_STAT_LOW_SPEED;
1132 max3421_hcd->port_status &= ~USB_PORT_STAT_LOW_SPEED;
1133 chg = (old_port_status ^ max3421_hcd->port_status);
1134 max3421_hcd->port_status |= chg << 16;
1135 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1139 max3421_irq_handler(int irq, void *dev_id)
1141 struct usb_hcd *hcd = dev_id;
1142 struct spi_device *spi = to_spi_device(hcd->self.controller);
1143 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1145 if (max3421_hcd->spi_thread &&
1146 max3421_hcd->spi_thread->state != TASK_RUNNING)
1147 wake_up_process(max3421_hcd->spi_thread);
1148 if (!test_and_set_bit(ENABLE_IRQ, &max3421_hcd->todo))
1149 disable_irq_nosync(spi->irq);
1156 dump_eps(struct usb_hcd *hcd)
1158 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1159 struct max3421_ep *max3421_ep;
1160 struct usb_host_endpoint *ep;
1161 struct list_head *pos, *upos;
1162 char ubuf[512], *dp, *end;
1163 unsigned long flags;
1167 spin_lock_irqsave(&max3421_hcd->lock, flags);
1168 list_for_each(pos, &max3421_hcd->ep_list) {
1169 max3421_ep = container_of(pos, struct max3421_ep, ep_list);
1170 ep = max3421_ep->ep;
1173 end = dp + sizeof(ubuf);
1175 list_for_each(upos, &ep->urb_list) {
1176 urb = container_of(upos, struct urb, urb_list);
1177 ret = snprintf(dp, end - dp, " %p(%d.%s %d/%d)", urb,
1178 usb_pipetype(urb->pipe),
1179 usb_urb_dir_in(urb) ? "IN" : "OUT",
1181 urb->transfer_buffer_length);
1182 if (ret < 0 || ret >= end - dp)
1183 break; /* error or buffer full */
1187 epnum = usb_endpoint_num(&ep->desc);
1188 pr_info("EP%0u %u lst %04u rtr %u nak %6u rxmt %u: %s\n",
1189 epnum, max3421_ep->pkt_state, max3421_ep->last_active,
1190 max3421_ep->retries, max3421_ep->naks,
1191 max3421_ep->retransmit, ubuf);
1193 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1198 /* Return zero if no work was performed, 1 otherwise. */
1200 max3421_handle_irqs(struct usb_hcd *hcd)
1202 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1203 u32 chg, old_port_status;
1204 unsigned long flags;
1208 * Read and ack pending interrupts (CPU must never
1209 * clear SNDBAV directly and RCVDAV must be cleared by
1210 * max3421_recv_data_available()!):
1212 hirq = spi_rd8(hcd, MAX3421_REG_HIRQ);
1213 hirq &= max3421_hcd->hien;
1217 spi_wr8(hcd, MAX3421_REG_HIRQ,
1218 hirq & ~(BIT(MAX3421_HI_SNDBAV_BIT) |
1219 BIT(MAX3421_HI_RCVDAV_BIT)));
1221 if (hirq & BIT(MAX3421_HI_FRAME_BIT)) {
1222 max3421_hcd->frame_number = ((max3421_hcd->frame_number + 1)
1223 & USB_MAX_FRAME_NUMBER);
1224 max3421_hcd->sched_pass = SCHED_PASS_PERIODIC;
1227 if (hirq & BIT(MAX3421_HI_RCVDAV_BIT))
1228 max3421_recv_data_available(hcd);
1230 if (hirq & BIT(MAX3421_HI_HXFRDN_BIT))
1231 max3421_host_transfer_done(hcd);
1233 if (hirq & BIT(MAX3421_HI_CONDET_BIT))
1234 max3421_detect_conn(hcd);
1237 * Now process interrupts that may affect HCD state
1238 * other than the end-points:
1240 spin_lock_irqsave(&max3421_hcd->lock, flags);
1242 old_port_status = max3421_hcd->port_status;
1243 if (hirq & BIT(MAX3421_HI_BUSEVENT_BIT)) {
1244 if (max3421_hcd->port_status & USB_PORT_STAT_RESET) {
1245 /* BUSEVENT due to completion of Bus Reset */
1246 max3421_hcd->port_status &= ~USB_PORT_STAT_RESET;
1247 max3421_hcd->port_status |= USB_PORT_STAT_ENABLE;
1249 /* BUSEVENT due to completion of Bus Resume */
1250 pr_info("%s: BUSEVENT Bus Resume Done\n", __func__);
1253 if (hirq & BIT(MAX3421_HI_RWU_BIT))
1254 pr_info("%s: RWU\n", __func__);
1255 if (hirq & BIT(MAX3421_HI_SUSDN_BIT))
1256 pr_info("%s: SUSDN\n", __func__);
1258 chg = (old_port_status ^ max3421_hcd->port_status);
1259 max3421_hcd->port_status |= chg << 16;
1261 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1265 static unsigned long last_time;
1266 char sbuf[16 * 16], *dp, *end;
1269 if (time_after(jiffies, last_time + 5*HZ)) {
1271 end = sbuf + sizeof(sbuf);
1273 for (i = 0; i < 16; ++i) {
1274 int ret = snprintf(dp, end - dp, " %lu",
1275 max3421_hcd->err_stat[i]);
1276 if (ret < 0 || ret >= end - dp)
1277 break; /* error or buffer full */
1280 pr_info("%s: hrsl_stats %s\n", __func__, sbuf);
1281 memset(max3421_hcd->err_stat, 0,
1282 sizeof(max3421_hcd->err_stat));
1283 last_time = jiffies;
1293 max3421_reset_hcd(struct usb_hcd *hcd)
1295 struct spi_device *spi = to_spi_device(hcd->self.controller);
1296 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1299 /* perform a chip reset and wait for OSCIRQ signal to appear: */
1300 spi_wr8(hcd, MAX3421_REG_USBCTL, BIT(MAX3421_USBCTL_CHIPRES_BIT));
1302 spi_wr8(hcd, MAX3421_REG_USBCTL, 0);
1305 if (spi_rd8(hcd, MAX3421_REG_USBIRQ)
1306 & BIT(MAX3421_USBIRQ_OSCOKIRQ_BIT))
1308 if (--timeout < 0) {
1310 "timed out waiting for oscillator OK signal");
1317 * Turn on host mode, automatic generation of SOF packets, and
1318 * enable pull-down registers on DM/DP:
1320 max3421_hcd->mode = (BIT(MAX3421_MODE_HOST_BIT) |
1321 BIT(MAX3421_MODE_SOFKAENAB_BIT) |
1322 BIT(MAX3421_MODE_DMPULLDN_BIT) |
1323 BIT(MAX3421_MODE_DPPULLDN_BIT));
1324 spi_wr8(hcd, MAX3421_REG_MODE, max3421_hcd->mode);
1326 /* reset frame-number: */
1327 max3421_hcd->frame_number = USB_MAX_FRAME_NUMBER;
1328 spi_wr8(hcd, MAX3421_REG_HCTL, BIT(MAX3421_HCTL_FRMRST_BIT));
1330 /* sample the state of the D+ and D- lines */
1331 spi_wr8(hcd, MAX3421_REG_HCTL, BIT(MAX3421_HCTL_SAMPLEBUS_BIT));
1332 max3421_detect_conn(hcd);
1334 /* enable frame, connection-detected, and bus-event interrupts: */
1335 max3421_hcd->hien = (BIT(MAX3421_HI_FRAME_BIT) |
1336 BIT(MAX3421_HI_CONDET_BIT) |
1337 BIT(MAX3421_HI_BUSEVENT_BIT));
1338 spi_wr8(hcd, MAX3421_REG_HIEN, max3421_hcd->hien);
1340 /* enable interrupts: */
1341 spi_wr8(hcd, MAX3421_REG_CPUCTL, BIT(MAX3421_CPUCTL_IE_BIT));
1346 max3421_urb_done(struct usb_hcd *hcd)
1348 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1349 unsigned long flags;
1353 status = max3421_hcd->urb_done;
1354 max3421_hcd->urb_done = 0;
1357 urb = max3421_hcd->curr_urb;
1359 /* save the old end-points toggles: */
1360 u8 hrsl = spi_rd8(hcd, MAX3421_REG_HRSL);
1361 int rcvtog = (hrsl >> MAX3421_HRSL_RCVTOGRD_BIT) & 1;
1362 int sndtog = (hrsl >> MAX3421_HRSL_SNDTOGRD_BIT) & 1;
1363 int epnum = usb_endpoint_num(&urb->ep->desc);
1365 /* no locking: HCD (i.e., we) own toggles, don't we? */
1366 usb_settoggle(urb->dev, epnum, 0, rcvtog);
1367 usb_settoggle(urb->dev, epnum, 1, sndtog);
1369 max3421_hcd->curr_urb = NULL;
1370 spin_lock_irqsave(&max3421_hcd->lock, flags);
1371 usb_hcd_unlink_urb_from_ep(hcd, urb);
1372 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1374 /* must be called without the HCD spinlock: */
1375 usb_hcd_giveback_urb(hcd, urb, status);
1381 max3421_spi_thread(void *dev_id)
1383 struct usb_hcd *hcd = dev_id;
1384 struct spi_device *spi = to_spi_device(hcd->self.controller);
1385 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1386 int i, i_worked = 1;
1388 /* set full-duplex SPI mode, low-active interrupt pin: */
1389 spi_wr8(hcd, MAX3421_REG_PINCTL,
1390 (BIT(MAX3421_PINCTL_FDUPSPI_BIT) | /* full-duplex */
1391 BIT(MAX3421_PINCTL_INTLEVEL_BIT))); /* low-active irq */
1393 while (!kthread_should_stop()) {
1394 max3421_hcd->rev = spi_rd8(hcd, MAX3421_REG_REVISION);
1395 if (max3421_hcd->rev == 0x12 || max3421_hcd->rev == 0x13)
1397 dev_err(&spi->dev, "bad rev 0x%02x", max3421_hcd->rev);
1400 dev_info(&spi->dev, "rev 0x%x, SPI clk %dHz, bpw %u, irq %d\n",
1401 max3421_hcd->rev, spi->max_speed_hz, spi->bits_per_word,
1404 while (!kthread_should_stop()) {
1407 * We'll be waiting for wakeups from the hard
1408 * interrupt handler, so now is a good time to
1409 * sync our hien with the chip:
1411 spi_wr8(hcd, MAX3421_REG_HIEN, max3421_hcd->hien);
1413 set_current_state(TASK_INTERRUPTIBLE);
1414 if (test_and_clear_bit(ENABLE_IRQ, &max3421_hcd->todo))
1415 enable_irq(spi->irq);
1417 __set_current_state(TASK_RUNNING);
1422 if (max3421_hcd->urb_done)
1423 i_worked |= max3421_urb_done(hcd);
1424 else if (max3421_handle_irqs(hcd))
1426 else if (!max3421_hcd->curr_urb)
1427 i_worked |= max3421_select_and_start_urb(hcd);
1429 if (test_and_clear_bit(RESET_HCD, &max3421_hcd->todo))
1430 /* reset the HCD: */
1431 i_worked |= max3421_reset_hcd(hcd);
1432 if (test_and_clear_bit(RESET_PORT, &max3421_hcd->todo)) {
1433 /* perform a USB bus reset: */
1434 spi_wr8(hcd, MAX3421_REG_HCTL,
1435 BIT(MAX3421_HCTL_BUSRST_BIT));
1438 if (test_and_clear_bit(CHECK_UNLINK, &max3421_hcd->todo))
1439 i_worked |= max3421_check_unlink(hcd);
1440 if (test_and_clear_bit(IOPIN_UPDATE, &max3421_hcd->todo)) {
1442 * IOPINS1/IOPINS2 do not auto-increment, so we can't
1445 for (i = 0; i < ARRAY_SIZE(max3421_hcd->iopins); ++i) {
1446 u8 val = spi_rd8(hcd, MAX3421_REG_IOPINS1);
1448 val = ((val & 0xf0) |
1449 (max3421_hcd->iopins[i] & 0x0f));
1450 spi_wr8(hcd, MAX3421_REG_IOPINS1 + i, val);
1451 max3421_hcd->iopins[i] = val;
1456 set_current_state(TASK_RUNNING);
1457 dev_info(&spi->dev, "SPI thread exiting");
1462 max3421_reset_port(struct usb_hcd *hcd)
1464 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1466 max3421_hcd->port_status &= ~(USB_PORT_STAT_ENABLE |
1467 USB_PORT_STAT_LOW_SPEED);
1468 max3421_hcd->port_status |= USB_PORT_STAT_RESET;
1469 set_bit(RESET_PORT, &max3421_hcd->todo);
1470 wake_up_process(max3421_hcd->spi_thread);
1475 max3421_reset(struct usb_hcd *hcd)
1477 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1479 hcd->self.sg_tablesize = 0;
1480 hcd->speed = HCD_USB2;
1481 hcd->self.root_hub->speed = USB_SPEED_FULL;
1482 set_bit(RESET_HCD, &max3421_hcd->todo);
1483 wake_up_process(max3421_hcd->spi_thread);
1488 max3421_start(struct usb_hcd *hcd)
1490 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1492 spin_lock_init(&max3421_hcd->lock);
1493 max3421_hcd->rh_state = MAX3421_RH_RUNNING;
1495 INIT_LIST_HEAD(&max3421_hcd->ep_list);
1497 hcd->power_budget = POWER_BUDGET;
1498 hcd->state = HC_STATE_RUNNING;
1499 hcd->uses_new_polling = 1;
1504 max3421_stop(struct usb_hcd *hcd)
1509 max3421_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
1511 struct spi_device *spi = to_spi_device(hcd->self.controller);
1512 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1513 struct max3421_ep *max3421_ep;
1514 unsigned long flags;
1517 switch (usb_pipetype(urb->pipe)) {
1518 case PIPE_INTERRUPT:
1519 case PIPE_ISOCHRONOUS:
1520 if (urb->interval < 0) {
1522 "%s: interval=%d for intr-/iso-pipe; expected > 0\n",
1523 __func__, urb->interval);
1530 spin_lock_irqsave(&max3421_hcd->lock, flags);
1532 max3421_ep = urb->ep->hcpriv;
1534 /* gets freed in max3421_endpoint_disable: */
1535 max3421_ep = kzalloc(sizeof(struct max3421_ep), GFP_ATOMIC);
1540 max3421_ep->ep = urb->ep;
1541 max3421_ep->last_active = max3421_hcd->frame_number;
1542 urb->ep->hcpriv = max3421_ep;
1544 list_add_tail(&max3421_ep->ep_list, &max3421_hcd->ep_list);
1547 retval = usb_hcd_link_urb_to_ep(hcd, urb);
1549 /* Since we added to the queue, restart scheduling: */
1550 max3421_hcd->sched_pass = SCHED_PASS_PERIODIC;
1551 wake_up_process(max3421_hcd->spi_thread);
1555 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1560 max3421_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1562 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1563 unsigned long flags;
1566 spin_lock_irqsave(&max3421_hcd->lock, flags);
1569 * This will set urb->unlinked which in turn causes the entry
1570 * to be dropped at the next opportunity.
1572 retval = usb_hcd_check_unlink_urb(hcd, urb, status);
1574 set_bit(CHECK_UNLINK, &max3421_hcd->todo);
1575 wake_up_process(max3421_hcd->spi_thread);
1577 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1582 max3421_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1584 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1585 unsigned long flags;
1587 spin_lock_irqsave(&max3421_hcd->lock, flags);
1590 struct max3421_ep *max3421_ep = ep->hcpriv;
1592 /* remove myself from the ep_list: */
1593 if (!list_empty(&max3421_ep->ep_list))
1594 list_del(&max3421_ep->ep_list);
1599 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1603 max3421_get_frame_number(struct usb_hcd *hcd)
1605 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1606 return max3421_hcd->frame_number;
1610 * Should return a non-zero value when any port is undergoing a resume
1611 * transition while the root hub is suspended.
1614 max3421_hub_status_data(struct usb_hcd *hcd, char *buf)
1616 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1617 unsigned long flags;
1620 spin_lock_irqsave(&max3421_hcd->lock, flags);
1621 if (!HCD_HW_ACCESSIBLE(hcd))
1625 if ((max3421_hcd->port_status & PORT_C_MASK) != 0) {
1626 *buf = (1 << 1); /* a hub over-current condition exists */
1627 dev_dbg(hcd->self.controller,
1628 "port status 0x%08x has changes\n",
1629 max3421_hcd->port_status);
1631 if (max3421_hcd->rh_state == MAX3421_RH_SUSPENDED)
1632 usb_hcd_resume_root_hub(hcd);
1635 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1640 hub_descriptor(struct usb_hub_descriptor *desc)
1642 memset(desc, 0, sizeof(*desc));
1644 * See Table 11-13: Hub Descriptor in USB 2.0 spec.
1646 desc->bDescriptorType = USB_DT_HUB; /* hub descriptor */
1647 desc->bDescLength = 9;
1648 desc->wHubCharacteristics = cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM |
1649 HUB_CHAR_COMMON_OCPM);
1650 desc->bNbrPorts = 1;
1654 * Set the MAX3421E general-purpose output with number PIN_NUMBER to
1655 * VALUE (0 or 1). PIN_NUMBER may be in the range from 1-8. For
1656 * any other value, this function acts as a no-op.
1659 max3421_gpout_set_value(struct usb_hcd *hcd, u8 pin_number, u8 value)
1661 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1668 mask = 1u << pin_number;
1669 idx = pin_number / 4;
1672 max3421_hcd->iopins[idx] |= mask;
1674 max3421_hcd->iopins[idx] &= ~mask;
1675 set_bit(IOPIN_UPDATE, &max3421_hcd->todo);
1676 wake_up_process(max3421_hcd->spi_thread);
1680 max3421_hub_control(struct usb_hcd *hcd, u16 type_req, u16 value, u16 index,
1681 char *buf, u16 length)
1683 struct spi_device *spi = to_spi_device(hcd->self.controller);
1684 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1685 struct max3421_hcd_platform_data *pdata;
1686 unsigned long flags;
1689 spin_lock_irqsave(&max3421_hcd->lock, flags);
1691 pdata = spi->dev.platform_data;
1694 case ClearHubFeature:
1696 case ClearPortFeature:
1698 case USB_PORT_FEAT_SUSPEND:
1700 case USB_PORT_FEAT_POWER:
1701 dev_dbg(hcd->self.controller, "power-off\n");
1702 max3421_gpout_set_value(hcd, pdata->vbus_gpout,
1703 !pdata->vbus_active_level);
1706 max3421_hcd->port_status &= ~(1 << value);
1709 case GetHubDescriptor:
1710 hub_descriptor((struct usb_hub_descriptor *) buf);
1713 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
1714 case GetPortErrorCount:
1720 *(__le32 *) buf = cpu_to_le32(0);
1728 ((__le16 *) buf)[0] = cpu_to_le16(max3421_hcd->port_status);
1729 ((__le16 *) buf)[1] =
1730 cpu_to_le16(max3421_hcd->port_status >> 16);
1737 case SetPortFeature:
1739 case USB_PORT_FEAT_LINK_STATE:
1740 case USB_PORT_FEAT_U1_TIMEOUT:
1741 case USB_PORT_FEAT_U2_TIMEOUT:
1742 case USB_PORT_FEAT_BH_PORT_RESET:
1744 case USB_PORT_FEAT_SUSPEND:
1745 if (max3421_hcd->active)
1746 max3421_hcd->port_status |=
1747 USB_PORT_STAT_SUSPEND;
1749 case USB_PORT_FEAT_POWER:
1750 dev_dbg(hcd->self.controller, "power-on\n");
1751 max3421_hcd->port_status |= USB_PORT_STAT_POWER;
1752 max3421_gpout_set_value(hcd, pdata->vbus_gpout,
1753 pdata->vbus_active_level);
1755 case USB_PORT_FEAT_RESET:
1756 max3421_reset_port(hcd);
1759 if ((max3421_hcd->port_status & USB_PORT_STAT_POWER)
1761 max3421_hcd->port_status |= (1 << value);
1766 dev_dbg(hcd->self.controller,
1767 "hub control req%04x v%04x i%04x l%d\n",
1768 type_req, value, index, length);
1769 error: /* "protocol stall" on error */
1773 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1778 max3421_bus_suspend(struct usb_hcd *hcd)
1784 max3421_bus_resume(struct usb_hcd *hcd)
1790 * The SPI driver already takes care of DMA-mapping/unmapping, so no
1791 * reason to do it twice.
1794 max3421_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
1800 max3421_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1804 static struct hc_driver max3421_hcd_desc = {
1805 .description = "max3421",
1806 .product_desc = DRIVER_DESC,
1807 .hcd_priv_size = sizeof(struct max3421_hcd),
1809 .reset = max3421_reset,
1810 .start = max3421_start,
1811 .stop = max3421_stop,
1812 .get_frame_number = max3421_get_frame_number,
1813 .urb_enqueue = max3421_urb_enqueue,
1814 .urb_dequeue = max3421_urb_dequeue,
1815 .map_urb_for_dma = max3421_map_urb_for_dma,
1816 .unmap_urb_for_dma = max3421_unmap_urb_for_dma,
1817 .endpoint_disable = max3421_endpoint_disable,
1818 .hub_status_data = max3421_hub_status_data,
1819 .hub_control = max3421_hub_control,
1820 .bus_suspend = max3421_bus_suspend,
1821 .bus_resume = max3421_bus_resume,
1825 max3421_probe(struct spi_device *spi)
1827 struct max3421_hcd *max3421_hcd;
1828 struct usb_hcd *hcd = NULL;
1829 int retval = -ENOMEM;
1831 if (spi_setup(spi) < 0) {
1832 dev_err(&spi->dev, "Unable to setup SPI bus");
1836 hcd = usb_create_hcd(&max3421_hcd_desc, &spi->dev,
1837 dev_name(&spi->dev));
1839 dev_err(&spi->dev, "failed to create HCD structure\n");
1842 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1843 max3421_hcd = hcd_to_max3421(hcd);
1844 max3421_hcd->next = max3421_hcd_list;
1845 max3421_hcd_list = max3421_hcd;
1846 INIT_LIST_HEAD(&max3421_hcd->ep_list);
1848 max3421_hcd->tx = kmalloc(sizeof(*max3421_hcd->tx), GFP_KERNEL);
1849 if (!max3421_hcd->tx) {
1850 dev_err(&spi->dev, "failed to kmalloc tx buffer\n");
1853 max3421_hcd->rx = kmalloc(sizeof(*max3421_hcd->rx), GFP_KERNEL);
1854 if (!max3421_hcd->rx) {
1855 dev_err(&spi->dev, "failed to kmalloc rx buffer\n");
1859 max3421_hcd->spi_thread = kthread_run(max3421_spi_thread, hcd,
1860 "max3421_spi_thread");
1861 if (max3421_hcd->spi_thread == ERR_PTR(-ENOMEM)) {
1863 "failed to create SPI thread (out of memory)\n");
1867 retval = usb_add_hcd(hcd, 0, 0);
1869 dev_err(&spi->dev, "failed to add HCD\n");
1873 retval = request_irq(spi->irq, max3421_irq_handler,
1874 IRQF_TRIGGER_LOW, "max3421", hcd);
1876 dev_err(&spi->dev, "failed to request irq %d\n", spi->irq);
1883 kfree(max3421_hcd->tx);
1884 kfree(max3421_hcd->rx);
1885 if (max3421_hcd->spi_thread)
1886 kthread_stop(max3421_hcd->spi_thread);
1893 max3421_remove(struct spi_device *spi)
1895 struct max3421_hcd *max3421_hcd = NULL, **prev;
1896 struct usb_hcd *hcd = NULL;
1897 unsigned long flags;
1899 for (prev = &max3421_hcd_list; *prev; prev = &(*prev)->next) {
1900 max3421_hcd = *prev;
1901 hcd = max3421_to_hcd(max3421_hcd);
1902 if (hcd->self.controller == &spi->dev)
1906 dev_err(&spi->dev, "no MAX3421 HCD found for SPI device %p\n",
1911 usb_remove_hcd(hcd);
1913 spin_lock_irqsave(&max3421_hcd->lock, flags);
1915 kthread_stop(max3421_hcd->spi_thread);
1916 *prev = max3421_hcd->next;
1918 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1920 free_irq(spi->irq, hcd);
1926 static struct spi_driver max3421_driver = {
1927 .probe = max3421_probe,
1928 .remove = max3421_remove,
1930 .name = "max3421-hcd",
1934 module_spi_driver(max3421_driver);
1936 MODULE_DESCRIPTION(DRIVER_DESC);
1937 MODULE_AUTHOR("David Mosberger <davidm@egauge.net>");
1938 MODULE_LICENSE("GPL");