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/module.h>
59 #include <linux/spi/spi.h>
60 #include <linux/usb.h>
61 #include <linux/usb/hcd.h>
63 #include <linux/platform_data/max3421-hcd.h>
65 #define DRIVER_DESC "MAX3421 USB Host-Controller Driver"
66 #define DRIVER_VERSION "1.0"
68 /* 11-bit counter that wraps around (USB 2.0 Section 8.3.3): */
69 #define USB_MAX_FRAME_NUMBER 0x7ff
70 #define USB_MAX_RETRIES 3 /* # of retries before error is reported */
73 * Max. # of times we're willing to retransmit a request immediately in
74 * resposne to a NAK. Afterwards, we fall back on trying once a frame.
76 #define NAK_MAX_FAST_RETRANSMITS 2
78 #define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */
80 /* Port-change mask: */
81 #define PORT_C_MASK ((USB_PORT_STAT_C_CONNECTION | \
82 USB_PORT_STAT_C_ENABLE | \
83 USB_PORT_STAT_C_SUSPEND | \
84 USB_PORT_STAT_C_OVERCURRENT | \
85 USB_PORT_STAT_C_RESET) << 16)
87 enum max3421_rh_state {
94 PKT_STATE_SETUP, /* waiting to send setup packet to ctrl pipe */
95 PKT_STATE_TRANSFER, /* waiting to xfer transfer_buffer */
96 PKT_STATE_TERMINATE /* waiting to terminate control transfer */
99 enum scheduling_pass {
101 SCHED_PASS_NON_PERIODIC,
105 struct max3421_dma_buf {
112 struct task_struct *spi_thread;
114 struct max3421_hcd *next;
116 enum max3421_rh_state rh_state;
117 /* lower 16 bits contain port status, upper 16 bits the change mask: */
122 struct list_head ep_list; /* list of EP's with work */
125 * The following are owned by spi_thread (may be accessed by
126 * SPI-thread without acquiring the HCD lock:
128 u8 rev; /* chip revision */
131 * kmalloc'd buffers guaranteed to be in separate (DMA)
134 struct max3421_dma_buf *tx;
135 struct max3421_dma_buf *rx;
137 * URB we're currently processing. Must not be reset to NULL
138 * unless MAX3421E chip is idle:
140 struct urb *curr_urb;
141 enum scheduling_pass sched_pass;
142 struct usb_device *loaded_dev; /* dev that's loaded into the chip */
143 int loaded_epnum; /* epnum whose toggles are loaded */
144 int urb_done; /* > 0 -> no errors, < 0: errno */
149 unsigned int do_enable_irq:1;
150 unsigned int do_reset_hcd:1;
151 unsigned int do_reset_port:1;
152 unsigned int do_check_unlink:1;
153 unsigned int do_iopin_update:1;
155 unsigned long err_stat[16];
160 struct usb_host_endpoint *ep;
161 struct list_head ep_list;
163 u16 last_active; /* frame # this ep was last active */
164 enum pkt_state pkt_state;
166 u8 retransmit; /* packet needs retransmission */
169 static struct max3421_hcd *max3421_hcd_list;
171 #define MAX3421_FIFO_SIZE 64
173 #define MAX3421_SPI_DIR_RD 0 /* read register from MAX3421 */
174 #define MAX3421_SPI_DIR_WR 1 /* write register to MAX3421 */
177 #define MAX3421_SPI_DIR_SHIFT 1
178 #define MAX3421_SPI_REG_SHIFT 3
180 #define MAX3421_REG_RCVFIFO 1
181 #define MAX3421_REG_SNDFIFO 2
182 #define MAX3421_REG_SUDFIFO 4
183 #define MAX3421_REG_RCVBC 6
184 #define MAX3421_REG_SNDBC 7
185 #define MAX3421_REG_USBIRQ 13
186 #define MAX3421_REG_USBIEN 14
187 #define MAX3421_REG_USBCTL 15
188 #define MAX3421_REG_CPUCTL 16
189 #define MAX3421_REG_PINCTL 17
190 #define MAX3421_REG_REVISION 18
191 #define MAX3421_REG_IOPINS1 20
192 #define MAX3421_REG_IOPINS2 21
193 #define MAX3421_REG_GPINIRQ 22
194 #define MAX3421_REG_GPINIEN 23
195 #define MAX3421_REG_GPINPOL 24
196 #define MAX3421_REG_HIRQ 25
197 #define MAX3421_REG_HIEN 26
198 #define MAX3421_REG_MODE 27
199 #define MAX3421_REG_PERADDR 28
200 #define MAX3421_REG_HCTL 29
201 #define MAX3421_REG_HXFR 30
202 #define MAX3421_REG_HRSL 31
205 MAX3421_USBIRQ_OSCOKIRQ_BIT = 0,
206 MAX3421_USBIRQ_NOVBUSIRQ_BIT = 5,
207 MAX3421_USBIRQ_VBUSIRQ_BIT
211 MAX3421_CPUCTL_IE_BIT = 0,
212 MAX3421_CPUCTL_PULSEWID0_BIT = 6,
213 MAX3421_CPUCTL_PULSEWID1_BIT
217 MAX3421_USBCTL_PWRDOWN_BIT = 4,
218 MAX3421_USBCTL_CHIPRES_BIT
222 MAX3421_PINCTL_GPXA_BIT = 0,
223 MAX3421_PINCTL_GPXB_BIT,
224 MAX3421_PINCTL_POSINT_BIT,
225 MAX3421_PINCTL_INTLEVEL_BIT,
226 MAX3421_PINCTL_FDUPSPI_BIT,
227 MAX3421_PINCTL_EP0INAK_BIT,
228 MAX3421_PINCTL_EP2INAK_BIT,
229 MAX3421_PINCTL_EP3INAK_BIT,
233 MAX3421_HI_BUSEVENT_BIT = 0, /* bus-reset/-resume */
234 MAX3421_HI_RWU_BIT, /* remote wakeup */
235 MAX3421_HI_RCVDAV_BIT, /* receive FIFO data available */
236 MAX3421_HI_SNDBAV_BIT, /* send buffer available */
237 MAX3421_HI_SUSDN_BIT, /* suspend operation done */
238 MAX3421_HI_CONDET_BIT, /* peripheral connect/disconnect */
239 MAX3421_HI_FRAME_BIT, /* frame generator */
240 MAX3421_HI_HXFRDN_BIT, /* host transfer done */
244 MAX3421_HCTL_BUSRST_BIT = 0,
245 MAX3421_HCTL_FRMRST_BIT,
246 MAX3421_HCTL_SAMPLEBUS_BIT,
247 MAX3421_HCTL_SIGRSM_BIT,
248 MAX3421_HCTL_RCVTOG0_BIT,
249 MAX3421_HCTL_RCVTOG1_BIT,
250 MAX3421_HCTL_SNDTOG0_BIT,
251 MAX3421_HCTL_SNDTOG1_BIT
255 MAX3421_MODE_HOST_BIT = 0,
256 MAX3421_MODE_LOWSPEED_BIT,
257 MAX3421_MODE_HUBPRE_BIT,
258 MAX3421_MODE_SOFKAENAB_BIT,
259 MAX3421_MODE_SEPIRQ_BIT,
260 MAX3421_MODE_DELAYISO_BIT,
261 MAX3421_MODE_DMPULLDN_BIT,
262 MAX3421_MODE_DPPULLDN_BIT
273 MAX3421_HRSL_WRONGPID,
280 MAX3421_HRSL_TIMEOUT,
282 MAX3421_HRSL_RESULT_MASK = 0xf,
283 MAX3421_HRSL_RCVTOGRD_BIT = 4,
284 MAX3421_HRSL_SNDTOGRD_BIT,
285 MAX3421_HRSL_KSTATUS_BIT,
286 MAX3421_HRSL_JSTATUS_BIT
289 /* Return same error-codes as ohci.h:cc_to_error: */
290 static const int hrsl_to_error[] = {
291 [MAX3421_HRSL_OK] = 0,
292 [MAX3421_HRSL_BUSY] = -EINVAL,
293 [MAX3421_HRSL_BADREQ] = -EINVAL,
294 [MAX3421_HRSL_UNDEF] = -EINVAL,
295 [MAX3421_HRSL_NAK] = -EAGAIN,
296 [MAX3421_HRSL_STALL] = -EPIPE,
297 [MAX3421_HRSL_TOGERR] = -EILSEQ,
298 [MAX3421_HRSL_WRONGPID] = -EPROTO,
299 [MAX3421_HRSL_BADBC] = -EREMOTEIO,
300 [MAX3421_HRSL_PIDERR] = -EPROTO,
301 [MAX3421_HRSL_PKTERR] = -EPROTO,
302 [MAX3421_HRSL_CRCERR] = -EILSEQ,
303 [MAX3421_HRSL_KERR] = -EIO,
304 [MAX3421_HRSL_JERR] = -EIO,
305 [MAX3421_HRSL_TIMEOUT] = -ETIME,
306 [MAX3421_HRSL_BABBLE] = -EOVERFLOW
310 * See http://www.beyondlogic.org/usbnutshell/usb4.shtml#Control for a
311 * reasonable overview of how control transfers use the the IN/OUT
314 #define MAX3421_HXFR_BULK_IN(ep) (0x00 | (ep)) /* bulk or interrupt */
315 #define MAX3421_HXFR_SETUP 0x10
316 #define MAX3421_HXFR_BULK_OUT(ep) (0x20 | (ep)) /* bulk or interrupt */
317 #define MAX3421_HXFR_ISO_IN(ep) (0x40 | (ep))
318 #define MAX3421_HXFR_ISO_OUT(ep) (0x60 | (ep))
319 #define MAX3421_HXFR_HS_IN 0x80 /* handshake in */
320 #define MAX3421_HXFR_HS_OUT 0xa0 /* handshake out */
322 #define field(val, bit) ((val) << (bit))
325 frame_diff(u16 left, u16 right)
327 return ((unsigned) (left - right)) % (USB_MAX_FRAME_NUMBER + 1);
330 static inline struct max3421_hcd *
331 hcd_to_max3421(struct usb_hcd *hcd)
333 return (struct max3421_hcd *) hcd->hcd_priv;
336 static inline struct usb_hcd *
337 max3421_to_hcd(struct max3421_hcd *max3421_hcd)
339 return container_of((void *) max3421_hcd, struct usb_hcd, hcd_priv);
343 spi_rd8(struct usb_hcd *hcd, unsigned int reg)
345 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
346 struct spi_device *spi = to_spi_device(hcd->self.controller);
347 struct spi_transfer transfer;
348 struct spi_message msg;
350 memset(&transfer, 0, sizeof(transfer));
352 spi_message_init(&msg);
354 max3421_hcd->tx->data[0] =
355 (field(reg, MAX3421_SPI_REG_SHIFT) |
356 field(MAX3421_SPI_DIR_RD, MAX3421_SPI_DIR_SHIFT));
358 transfer.tx_buf = max3421_hcd->tx->data;
359 transfer.rx_buf = max3421_hcd->rx->data;
362 spi_message_add_tail(&transfer, &msg);
365 return max3421_hcd->rx->data[1];
369 spi_wr8(struct usb_hcd *hcd, unsigned int reg, u8 val)
371 struct spi_device *spi = to_spi_device(hcd->self.controller);
372 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
373 struct spi_transfer transfer;
374 struct spi_message msg;
376 memset(&transfer, 0, sizeof(transfer));
378 spi_message_init(&msg);
380 max3421_hcd->tx->data[0] =
381 (field(reg, MAX3421_SPI_REG_SHIFT) |
382 field(MAX3421_SPI_DIR_WR, MAX3421_SPI_DIR_SHIFT));
383 max3421_hcd->tx->data[1] = val;
385 transfer.tx_buf = max3421_hcd->tx->data;
388 spi_message_add_tail(&transfer, &msg);
393 spi_rd_buf(struct usb_hcd *hcd, unsigned int reg, void *buf, size_t len)
395 struct spi_device *spi = to_spi_device(hcd->self.controller);
396 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
397 struct spi_transfer transfer[2];
398 struct spi_message msg;
400 memset(transfer, 0, sizeof(transfer));
402 spi_message_init(&msg);
404 max3421_hcd->tx->data[0] =
405 (field(reg, MAX3421_SPI_REG_SHIFT) |
406 field(MAX3421_SPI_DIR_RD, MAX3421_SPI_DIR_SHIFT));
407 transfer[0].tx_buf = max3421_hcd->tx->data;
410 transfer[1].rx_buf = buf;
411 transfer[1].len = len;
413 spi_message_add_tail(&transfer[0], &msg);
414 spi_message_add_tail(&transfer[1], &msg);
419 spi_wr_buf(struct usb_hcd *hcd, unsigned int reg, void *buf, size_t len)
421 struct spi_device *spi = to_spi_device(hcd->self.controller);
422 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
423 struct spi_transfer transfer[2];
424 struct spi_message msg;
426 memset(transfer, 0, sizeof(transfer));
428 spi_message_init(&msg);
430 max3421_hcd->tx->data[0] =
431 (field(reg, MAX3421_SPI_REG_SHIFT) |
432 field(MAX3421_SPI_DIR_WR, MAX3421_SPI_DIR_SHIFT));
434 transfer[0].tx_buf = max3421_hcd->tx->data;
437 transfer[1].tx_buf = buf;
438 transfer[1].len = len;
440 spi_message_add_tail(&transfer[0], &msg);
441 spi_message_add_tail(&transfer[1], &msg);
446 * Figure out the correct setting for the LOWSPEED and HUBPRE mode
447 * bits. The HUBPRE bit needs to be set when MAX3421E operates at
448 * full speed, but it's talking to a low-speed device (i.e., through a
449 * hub). Setting that bit ensures that every low-speed packet is
450 * preceded by a full-speed PRE PID. Possible configurations:
452 * Hub speed: Device speed: => LOWSPEED bit: HUBPRE bit:
459 max3421_set_speed(struct usb_hcd *hcd, struct usb_device *dev)
461 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
462 u8 mode_lowspeed, mode_hubpre, mode = max3421_hcd->mode;
464 mode_lowspeed = BIT(MAX3421_MODE_LOWSPEED_BIT);
465 mode_hubpre = BIT(MAX3421_MODE_HUBPRE_BIT);
466 if (max3421_hcd->port_status & USB_PORT_STAT_LOW_SPEED) {
467 mode |= mode_lowspeed;
468 mode &= ~mode_hubpre;
469 } else if (dev->speed == USB_SPEED_LOW) {
470 mode |= mode_lowspeed | mode_hubpre;
472 mode &= ~(mode_lowspeed | mode_hubpre);
474 if (mode != max3421_hcd->mode) {
475 max3421_hcd->mode = mode;
476 spi_wr8(hcd, MAX3421_REG_MODE, max3421_hcd->mode);
482 * Caller must NOT hold HCD spinlock.
485 max3421_set_address(struct usb_hcd *hcd, struct usb_device *dev, int epnum,
488 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
489 int old_epnum, same_ep, rcvtog, sndtog;
490 struct usb_device *old_dev;
493 old_dev = max3421_hcd->loaded_dev;
494 old_epnum = max3421_hcd->loaded_epnum;
496 same_ep = (dev == old_dev && epnum == old_epnum);
497 if (same_ep && !force_toggles)
500 if (old_dev && !same_ep) {
501 /* save the old end-points toggles: */
502 u8 hrsl = spi_rd8(hcd, MAX3421_REG_HRSL);
504 rcvtog = (hrsl >> MAX3421_HRSL_RCVTOGRD_BIT) & 1;
505 sndtog = (hrsl >> MAX3421_HRSL_SNDTOGRD_BIT) & 1;
507 /* no locking: HCD (i.e., we) own toggles, don't we? */
508 usb_settoggle(old_dev, old_epnum, 0, rcvtog);
509 usb_settoggle(old_dev, old_epnum, 1, sndtog);
511 /* setup new endpoint's toggle bits: */
512 rcvtog = usb_gettoggle(dev, epnum, 0);
513 sndtog = usb_gettoggle(dev, epnum, 1);
514 hctl = (BIT(rcvtog + MAX3421_HCTL_RCVTOG0_BIT) |
515 BIT(sndtog + MAX3421_HCTL_SNDTOG0_BIT));
517 max3421_hcd->loaded_epnum = epnum;
518 spi_wr8(hcd, MAX3421_REG_HCTL, hctl);
521 * Note: devnum for one and the same device can change during
522 * address-assignment so it's best to just always load the
523 * address whenever the end-point changed/was forced.
525 max3421_hcd->loaded_dev = dev;
526 spi_wr8(hcd, MAX3421_REG_PERADDR, dev->devnum);
530 max3421_ctrl_setup(struct usb_hcd *hcd, struct urb *urb)
532 spi_wr_buf(hcd, MAX3421_REG_SUDFIFO, urb->setup_packet, 8);
533 return MAX3421_HXFR_SETUP;
537 max3421_transfer_in(struct usb_hcd *hcd, struct urb *urb)
539 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
540 int epnum = usb_pipeendpoint(urb->pipe);
542 max3421_hcd->curr_len = 0;
543 max3421_hcd->hien |= BIT(MAX3421_HI_RCVDAV_BIT);
544 return MAX3421_HXFR_BULK_IN(epnum);
548 max3421_transfer_out(struct usb_hcd *hcd, struct urb *urb, int fast_retransmit)
550 struct spi_device *spi = to_spi_device(hcd->self.controller);
551 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
552 int epnum = usb_pipeendpoint(urb->pipe);
556 src = urb->transfer_buffer + urb->actual_length;
558 if (fast_retransmit) {
559 if (max3421_hcd->rev == 0x12) {
560 /* work around rev 0x12 bug: */
561 spi_wr8(hcd, MAX3421_REG_SNDBC, 0);
562 spi_wr8(hcd, MAX3421_REG_SNDFIFO, ((u8 *) src)[0]);
563 spi_wr8(hcd, MAX3421_REG_SNDBC, max3421_hcd->curr_len);
565 return MAX3421_HXFR_BULK_OUT(epnum);
568 max_packet = usb_maxpacket(urb->dev, urb->pipe, 1);
570 if (max_packet > MAX3421_FIFO_SIZE) {
572 * We do not support isochronous transfers at this
576 "%s: packet-size of %u too big (limit is %u bytes)",
577 __func__, max_packet, MAX3421_FIFO_SIZE);
578 max3421_hcd->urb_done = -EMSGSIZE;
581 max3421_hcd->curr_len = min((urb->transfer_buffer_length -
582 urb->actual_length), max_packet);
584 spi_wr_buf(hcd, MAX3421_REG_SNDFIFO, src, max3421_hcd->curr_len);
585 spi_wr8(hcd, MAX3421_REG_SNDBC, max3421_hcd->curr_len);
586 return MAX3421_HXFR_BULK_OUT(epnum);
590 * Issue the next host-transfer command.
591 * Caller must NOT hold HCD spinlock.
594 max3421_next_transfer(struct usb_hcd *hcd, int fast_retransmit)
596 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
597 struct urb *urb = max3421_hcd->curr_urb;
598 struct max3421_ep *max3421_ep;
602 return; /* nothing to do */
604 max3421_ep = urb->ep->hcpriv;
606 switch (max3421_ep->pkt_state) {
607 case PKT_STATE_SETUP:
608 cmd = max3421_ctrl_setup(hcd, urb);
611 case PKT_STATE_TRANSFER:
612 if (usb_urb_dir_in(urb))
613 cmd = max3421_transfer_in(hcd, urb);
615 cmd = max3421_transfer_out(hcd, urb, fast_retransmit);
618 case PKT_STATE_TERMINATE:
620 * IN transfers are terminated with HS_OUT token,
621 * OUT transfers with HS_IN:
623 if (usb_urb_dir_in(urb))
624 cmd = MAX3421_HXFR_HS_OUT;
626 cmd = MAX3421_HXFR_HS_IN;
633 /* issue the command and wait for host-xfer-done interrupt: */
635 spi_wr8(hcd, MAX3421_REG_HXFR, cmd);
636 max3421_hcd->hien |= BIT(MAX3421_HI_HXFRDN_BIT);
640 * Find the next URB to process and start its execution.
642 * At this time, we do not anticipate ever connecting a USB hub to the
643 * MAX3421 chip, so at most USB device can be connected and we can use
644 * a simplistic scheduler: at the start of a frame, schedule all
645 * periodic transfers. Once that is done, use the remainder of the
646 * frame to process non-periodic (bulk & control) transfers.
649 * o Caller must NOT hold HCD spinlock.
650 * o max3421_hcd->curr_urb MUST BE NULL.
651 * o MAX3421E chip must be idle.
654 max3421_select_and_start_urb(struct usb_hcd *hcd)
656 struct spi_device *spi = to_spi_device(hcd->self.controller);
657 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
658 struct urb *urb, *curr_urb = NULL;
659 struct max3421_ep *max3421_ep;
660 int epnum, force_toggles = 0;
661 struct usb_host_endpoint *ep;
662 struct list_head *pos;
665 spin_lock_irqsave(&max3421_hcd->lock, flags);
668 max3421_hcd->sched_pass < SCHED_PASS_DONE;
669 ++max3421_hcd->sched_pass)
670 list_for_each(pos, &max3421_hcd->ep_list) {
672 max3421_ep = container_of(pos, struct max3421_ep,
676 switch (usb_endpoint_type(&ep->desc)) {
677 case USB_ENDPOINT_XFER_ISOC:
678 case USB_ENDPOINT_XFER_INT:
679 if (max3421_hcd->sched_pass !=
684 case USB_ENDPOINT_XFER_CONTROL:
685 case USB_ENDPOINT_XFER_BULK:
686 if (max3421_hcd->sched_pass !=
687 SCHED_PASS_NON_PERIODIC)
692 if (list_empty(&ep->urb_list))
693 continue; /* nothing to do */
694 urb = list_first_entry(&ep->urb_list, struct urb,
697 dev_dbg(&spi->dev, "%s: URB %p unlinked=%d",
698 __func__, urb, urb->unlinked);
699 max3421_hcd->curr_urb = urb;
700 max3421_hcd->urb_done = 1;
701 spin_unlock_irqrestore(&max3421_hcd->lock,
706 switch (usb_endpoint_type(&ep->desc)) {
707 case USB_ENDPOINT_XFER_CONTROL:
709 * Allow one control transaction per
710 * frame per endpoint:
712 if (frame_diff(max3421_ep->last_active,
713 max3421_hcd->frame_number) == 0)
717 case USB_ENDPOINT_XFER_BULK:
718 if (max3421_ep->retransmit
719 && (frame_diff(max3421_ep->last_active,
720 max3421_hcd->frame_number)
723 * We already tried this EP
724 * during this frame and got a
725 * NAK or error; wait for next frame
730 case USB_ENDPOINT_XFER_ISOC:
731 case USB_ENDPOINT_XFER_INT:
732 if (frame_diff(max3421_hcd->frame_number,
733 max3421_ep->last_active)
736 * We already processed this
737 * end-point in the current
744 /* move current ep to tail: */
745 list_move_tail(pos, &max3421_hcd->ep_list);
751 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
755 urb = max3421_hcd->curr_urb = curr_urb;
756 epnum = usb_endpoint_num(&urb->ep->desc);
757 if (max3421_ep->retransmit)
758 /* restart (part of) a USB transaction: */
759 max3421_ep->retransmit = 0;
761 /* start USB transaction: */
762 if (usb_endpoint_xfer_control(&ep->desc)) {
764 * See USB 2.0 spec section 8.6.1
765 * Initialization via SETUP Token:
767 usb_settoggle(urb->dev, epnum, 0, 1);
768 usb_settoggle(urb->dev, epnum, 1, 1);
769 max3421_ep->pkt_state = PKT_STATE_SETUP;
772 max3421_ep->pkt_state = PKT_STATE_TRANSFER;
775 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
777 max3421_ep->last_active = max3421_hcd->frame_number;
778 max3421_set_address(hcd, urb->dev, epnum, force_toggles);
779 max3421_set_speed(hcd, urb->dev);
780 max3421_next_transfer(hcd, 0);
785 * Check all endpoints for URBs that got unlinked.
787 * Caller must NOT hold HCD spinlock.
790 max3421_check_unlink(struct usb_hcd *hcd)
792 struct spi_device *spi = to_spi_device(hcd->self.controller);
793 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
794 struct list_head *pos, *upos, *next_upos;
795 struct max3421_ep *max3421_ep;
796 struct usb_host_endpoint *ep;
801 spin_lock_irqsave(&max3421_hcd->lock, flags);
802 list_for_each(pos, &max3421_hcd->ep_list) {
803 max3421_ep = container_of(pos, struct max3421_ep, ep_list);
805 list_for_each_safe(upos, next_upos, &ep->urb_list) {
806 urb = container_of(upos, struct urb, urb_list);
809 dev_dbg(&spi->dev, "%s: URB %p unlinked=%d",
810 __func__, urb, urb->unlinked);
811 usb_hcd_unlink_urb_from_ep(hcd, urb);
812 spin_unlock_irqrestore(&max3421_hcd->lock,
814 usb_hcd_giveback_urb(hcd, urb, 0);
815 spin_lock_irqsave(&max3421_hcd->lock, flags);
819 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
824 * Caller must NOT hold HCD spinlock.
827 max3421_slow_retransmit(struct usb_hcd *hcd)
829 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
830 struct urb *urb = max3421_hcd->curr_urb;
831 struct max3421_ep *max3421_ep;
833 max3421_ep = urb->ep->hcpriv;
834 max3421_ep->retransmit = 1;
835 max3421_hcd->curr_urb = NULL;
839 * Caller must NOT hold HCD spinlock.
842 max3421_recv_data_available(struct usb_hcd *hcd)
844 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
845 struct urb *urb = max3421_hcd->curr_urb;
846 size_t remaining, transfer_size;
849 rcvbc = spi_rd8(hcd, MAX3421_REG_RCVBC);
851 if (rcvbc > MAX3421_FIFO_SIZE)
852 rcvbc = MAX3421_FIFO_SIZE;
853 if (urb->actual_length >= urb->transfer_buffer_length)
856 remaining = urb->transfer_buffer_length - urb->actual_length;
857 transfer_size = rcvbc;
858 if (transfer_size > remaining)
859 transfer_size = remaining;
860 if (transfer_size > 0) {
861 void *dst = urb->transfer_buffer + urb->actual_length;
863 spi_rd_buf(hcd, MAX3421_REG_RCVFIFO, dst, transfer_size);
864 urb->actual_length += transfer_size;
865 max3421_hcd->curr_len = transfer_size;
868 /* ack the RCVDAV irq now that the FIFO has been read: */
869 spi_wr8(hcd, MAX3421_REG_HIRQ, BIT(MAX3421_HI_RCVDAV_BIT));
873 max3421_handle_error(struct usb_hcd *hcd, u8 hrsl)
875 struct spi_device *spi = to_spi_device(hcd->self.controller);
876 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
877 u8 result_code = hrsl & MAX3421_HRSL_RESULT_MASK;
878 struct urb *urb = max3421_hcd->curr_urb;
879 struct max3421_ep *max3421_ep = urb->ep->hcpriv;
883 * If an OUT command results in any response other than OK
884 * (i.e., error or NAK), we have to perform a dummy-write to
885 * SNDBC so the FIFO gets switched back to us. Otherwise, we
886 * get out of sync with the SNDFIFO double buffer.
888 switch_sndfifo = (max3421_ep->pkt_state == PKT_STATE_TRANSFER &&
889 usb_urb_dir_out(urb));
891 switch (result_code) {
892 case MAX3421_HRSL_OK:
893 return; /* this shouldn't happen */
895 case MAX3421_HRSL_WRONGPID: /* received wrong PID */
896 case MAX3421_HRSL_BUSY: /* SIE busy */
897 case MAX3421_HRSL_BADREQ: /* bad val in HXFR */
898 case MAX3421_HRSL_UNDEF: /* reserved */
899 case MAX3421_HRSL_KERR: /* K-state instead of response */
900 case MAX3421_HRSL_JERR: /* J-state instead of response */
902 * packet experienced an error that we cannot recover
905 max3421_hcd->urb_done = hrsl_to_error[result_code];
906 dev_dbg(&spi->dev, "%s: unexpected error HRSL=0x%02x",
910 case MAX3421_HRSL_TOGERR:
911 if (usb_urb_dir_in(urb))
912 ; /* don't do anything (device will switch toggle) */
914 /* flip the send toggle bit: */
915 int sndtog = (hrsl >> MAX3421_HRSL_SNDTOGRD_BIT) & 1;
918 spi_wr8(hcd, MAX3421_REG_HCTL,
919 BIT(sndtog + MAX3421_HCTL_SNDTOG0_BIT));
922 case MAX3421_HRSL_BADBC: /* bad byte count */
923 case MAX3421_HRSL_PIDERR: /* received PID is corrupted */
924 case MAX3421_HRSL_PKTERR: /* packet error (stuff, EOP) */
925 case MAX3421_HRSL_CRCERR: /* CRC error */
926 case MAX3421_HRSL_BABBLE: /* device talked too long */
927 case MAX3421_HRSL_TIMEOUT:
928 if (max3421_ep->retries++ < USB_MAX_RETRIES)
929 /* retry the packet again in the next frame */
930 max3421_slow_retransmit(hcd);
932 /* Based on ohci.h cc_to_err[]: */
933 max3421_hcd->urb_done = hrsl_to_error[result_code];
934 dev_dbg(&spi->dev, "%s: unexpected error HRSL=0x%02x",
939 case MAX3421_HRSL_STALL:
940 dev_dbg(&spi->dev, "%s: unexpected error HRSL=0x%02x",
942 max3421_hcd->urb_done = hrsl_to_error[result_code];
945 case MAX3421_HRSL_NAK:
947 * Device wasn't ready for data or has no data
948 * available: retry the packet again.
950 if (max3421_ep->naks++ < NAK_MAX_FAST_RETRANSMITS) {
951 max3421_next_transfer(hcd, 1);
954 max3421_slow_retransmit(hcd);
958 spi_wr8(hcd, MAX3421_REG_SNDBC, 0);
962 * Caller must NOT hold HCD spinlock.
965 max3421_transfer_in_done(struct usb_hcd *hcd, struct urb *urb)
967 struct spi_device *spi = to_spi_device(hcd->self.controller);
968 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
971 if (urb->actual_length >= urb->transfer_buffer_length)
972 return 1; /* read is complete, so we're done */
975 * USB 2.0 Section 5.3.2 Pipes: packets must be full size
976 * except for last one.
978 max_packet = usb_maxpacket(urb->dev, urb->pipe, 0);
979 if (max_packet > MAX3421_FIFO_SIZE) {
981 * We do not support isochronous transfers at this
985 "%s: packet-size of %u too big (limit is %u bytes)",
986 __func__, max_packet, MAX3421_FIFO_SIZE);
990 if (max3421_hcd->curr_len < max_packet) {
991 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
993 * remaining > 0 and received an
994 * unexpected partial packet ->
999 /* short read, but it's OK */
1002 return 0; /* not done */
1006 * Caller must NOT hold HCD spinlock.
1009 max3421_transfer_out_done(struct usb_hcd *hcd, struct urb *urb)
1011 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1013 urb->actual_length += max3421_hcd->curr_len;
1014 if (urb->actual_length < urb->transfer_buffer_length)
1016 if (urb->transfer_flags & URB_ZERO_PACKET) {
1018 * Some hardware needs a zero-size packet at the end
1019 * of a bulk-out transfer if the last transfer was a
1020 * full-sized packet (i.e., such hardware use <
1021 * max_packet as an indicator that the end of the
1022 * packet has been reached).
1024 u32 max_packet = usb_maxpacket(urb->dev, urb->pipe, 1);
1026 if (max3421_hcd->curr_len == max_packet)
1033 * Caller must NOT hold HCD spinlock.
1036 max3421_host_transfer_done(struct usb_hcd *hcd)
1038 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1039 struct urb *urb = max3421_hcd->curr_urb;
1040 struct max3421_ep *max3421_ep;
1041 u8 result_code, hrsl;
1044 max3421_hcd->hien &= ~(BIT(MAX3421_HI_HXFRDN_BIT) |
1045 BIT(MAX3421_HI_RCVDAV_BIT));
1047 hrsl = spi_rd8(hcd, MAX3421_REG_HRSL);
1048 result_code = hrsl & MAX3421_HRSL_RESULT_MASK;
1051 ++max3421_hcd->err_stat[result_code];
1054 max3421_ep = urb->ep->hcpriv;
1056 if (unlikely(result_code != MAX3421_HRSL_OK)) {
1057 max3421_handle_error(hcd, hrsl);
1061 max3421_ep->naks = 0;
1062 max3421_ep->retries = 0;
1063 switch (max3421_ep->pkt_state) {
1065 case PKT_STATE_SETUP:
1066 if (urb->transfer_buffer_length > 0)
1067 max3421_ep->pkt_state = PKT_STATE_TRANSFER;
1069 max3421_ep->pkt_state = PKT_STATE_TERMINATE;
1072 case PKT_STATE_TRANSFER:
1073 if (usb_urb_dir_in(urb))
1074 urb_done = max3421_transfer_in_done(hcd, urb);
1076 urb_done = max3421_transfer_out_done(hcd, urb);
1077 if (urb_done > 0 && usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1079 * We aren't really done - we still need to
1080 * terminate the control transfer:
1082 max3421_hcd->urb_done = urb_done = 0;
1083 max3421_ep->pkt_state = PKT_STATE_TERMINATE;
1087 case PKT_STATE_TERMINATE:
1093 max3421_hcd->urb_done = urb_done;
1095 max3421_next_transfer(hcd, 0);
1099 * Caller must NOT hold HCD spinlock.
1102 max3421_detect_conn(struct usb_hcd *hcd)
1104 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1105 unsigned int jk, have_conn = 0;
1106 u32 old_port_status, chg;
1107 unsigned long flags;
1110 hrsl = spi_rd8(hcd, MAX3421_REG_HRSL);
1112 jk = ((((hrsl >> MAX3421_HRSL_JSTATUS_BIT) & 1) << 0) |
1113 (((hrsl >> MAX3421_HRSL_KSTATUS_BIT) & 1) << 1));
1115 mode = max3421_hcd->mode;
1118 case 0x0: /* SE0: disconnect */
1120 * Turn off SOFKAENAB bit to avoid getting interrupt
1121 * every milli-second:
1123 mode &= ~BIT(MAX3421_MODE_SOFKAENAB_BIT);
1126 case 0x1: /* J=0,K=1: low-speed (in full-speed or vice versa) */
1127 case 0x2: /* J=1,K=0: full-speed (in full-speed or vice versa) */
1129 /* need to switch to the other speed: */
1130 mode ^= BIT(MAX3421_MODE_LOWSPEED_BIT);
1131 /* turn on SOFKAENAB bit: */
1132 mode |= BIT(MAX3421_MODE_SOFKAENAB_BIT);
1136 case 0x3: /* illegal */
1140 max3421_hcd->mode = mode;
1141 spi_wr8(hcd, MAX3421_REG_MODE, max3421_hcd->mode);
1143 spin_lock_irqsave(&max3421_hcd->lock, flags);
1144 old_port_status = max3421_hcd->port_status;
1146 max3421_hcd->port_status |= USB_PORT_STAT_CONNECTION;
1148 max3421_hcd->port_status &= ~USB_PORT_STAT_CONNECTION;
1149 if (mode & BIT(MAX3421_MODE_LOWSPEED_BIT))
1150 max3421_hcd->port_status |= USB_PORT_STAT_LOW_SPEED;
1152 max3421_hcd->port_status &= ~USB_PORT_STAT_LOW_SPEED;
1153 chg = (old_port_status ^ max3421_hcd->port_status);
1154 max3421_hcd->port_status |= chg << 16;
1155 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1159 max3421_irq_handler(int irq, void *dev_id)
1161 struct usb_hcd *hcd = dev_id;
1162 struct spi_device *spi = to_spi_device(hcd->self.controller);
1163 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1165 if (max3421_hcd->spi_thread &&
1166 max3421_hcd->spi_thread->state != TASK_RUNNING)
1167 wake_up_process(max3421_hcd->spi_thread);
1168 if (!max3421_hcd->do_enable_irq) {
1169 max3421_hcd->do_enable_irq = 1;
1170 disable_irq_nosync(spi->irq);
1178 dump_eps(struct usb_hcd *hcd)
1180 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1181 struct max3421_ep *max3421_ep;
1182 struct usb_host_endpoint *ep;
1183 struct list_head *pos, *upos;
1184 char ubuf[512], *dp, *end;
1185 unsigned long flags;
1189 spin_lock_irqsave(&max3421_hcd->lock, flags);
1190 list_for_each(pos, &max3421_hcd->ep_list) {
1191 max3421_ep = container_of(pos, struct max3421_ep, ep_list);
1192 ep = max3421_ep->ep;
1195 end = dp + sizeof(ubuf);
1197 list_for_each(upos, &ep->urb_list) {
1198 urb = container_of(upos, struct urb, urb_list);
1199 ret = snprintf(dp, end - dp, " %p(%d.%s %d/%d)", urb,
1200 usb_pipetype(urb->pipe),
1201 usb_urb_dir_in(urb) ? "IN" : "OUT",
1203 urb->transfer_buffer_length);
1204 if (ret < 0 || ret >= end - dp)
1205 break; /* error or buffer full */
1209 epnum = usb_endpoint_num(&ep->desc);
1210 pr_info("EP%0u %u lst %04u rtr %u nak %6u rxmt %u: %s\n",
1211 epnum, max3421_ep->pkt_state, max3421_ep->last_active,
1212 max3421_ep->retries, max3421_ep->naks,
1213 max3421_ep->retransmit, ubuf);
1215 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1220 /* Return zero if no work was performed, 1 otherwise. */
1222 max3421_handle_irqs(struct usb_hcd *hcd)
1224 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1225 u32 chg, old_port_status;
1226 unsigned long flags;
1230 * Read and ack pending interrupts (CPU must never
1231 * clear SNDBAV directly and RCVDAV must be cleared by
1232 * max3421_recv_data_available()!):
1234 hirq = spi_rd8(hcd, MAX3421_REG_HIRQ);
1235 hirq &= max3421_hcd->hien;
1239 spi_wr8(hcd, MAX3421_REG_HIRQ,
1240 hirq & ~(BIT(MAX3421_HI_SNDBAV_BIT) |
1241 BIT(MAX3421_HI_RCVDAV_BIT)));
1243 if (hirq & BIT(MAX3421_HI_FRAME_BIT)) {
1244 max3421_hcd->frame_number = ((max3421_hcd->frame_number + 1)
1245 & USB_MAX_FRAME_NUMBER);
1246 max3421_hcd->sched_pass = SCHED_PASS_PERIODIC;
1249 if (hirq & BIT(MAX3421_HI_RCVDAV_BIT))
1250 max3421_recv_data_available(hcd);
1252 if (hirq & BIT(MAX3421_HI_HXFRDN_BIT))
1253 max3421_host_transfer_done(hcd);
1255 if (hirq & BIT(MAX3421_HI_CONDET_BIT))
1256 max3421_detect_conn(hcd);
1259 * Now process interrupts that may affect HCD state
1260 * other than the end-points:
1262 spin_lock_irqsave(&max3421_hcd->lock, flags);
1264 old_port_status = max3421_hcd->port_status;
1265 if (hirq & BIT(MAX3421_HI_BUSEVENT_BIT)) {
1266 if (max3421_hcd->port_status & USB_PORT_STAT_RESET) {
1267 /* BUSEVENT due to completion of Bus Reset */
1268 max3421_hcd->port_status &= ~USB_PORT_STAT_RESET;
1269 max3421_hcd->port_status |= USB_PORT_STAT_ENABLE;
1271 /* BUSEVENT due to completion of Bus Resume */
1272 pr_info("%s: BUSEVENT Bus Resume Done\n", __func__);
1275 if (hirq & BIT(MAX3421_HI_RWU_BIT))
1276 pr_info("%s: RWU\n", __func__);
1277 if (hirq & BIT(MAX3421_HI_SUSDN_BIT))
1278 pr_info("%s: SUSDN\n", __func__);
1280 chg = (old_port_status ^ max3421_hcd->port_status);
1281 max3421_hcd->port_status |= chg << 16;
1283 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1287 static unsigned long last_time;
1288 char sbuf[16 * 16], *dp, *end;
1291 if (jiffies - last_time > 5*HZ) {
1293 end = sbuf + sizeof(sbuf);
1295 for (i = 0; i < 16; ++i) {
1296 int ret = snprintf(dp, end - dp, " %lu",
1297 max3421_hcd->err_stat[i]);
1298 if (ret < 0 || ret >= end - dp)
1299 break; /* error or buffer full */
1302 pr_info("%s: hrsl_stats %s\n", __func__, sbuf);
1303 memset(max3421_hcd->err_stat, 0,
1304 sizeof(max3421_hcd->err_stat));
1305 last_time = jiffies;
1315 max3421_reset_hcd(struct usb_hcd *hcd)
1317 struct spi_device *spi = to_spi_device(hcd->self.controller);
1318 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1321 /* perform a chip reset and wait for OSCIRQ signal to appear: */
1322 spi_wr8(hcd, MAX3421_REG_USBCTL, BIT(MAX3421_USBCTL_CHIPRES_BIT));
1324 spi_wr8(hcd, MAX3421_REG_USBCTL, 0);
1327 if (spi_rd8(hcd, MAX3421_REG_USBIRQ)
1328 & BIT(MAX3421_USBIRQ_OSCOKIRQ_BIT))
1330 if (--timeout < 0) {
1332 "timed out waiting for oscillator OK signal");
1339 * Turn on host mode, automatic generation of SOF packets, and
1340 * enable pull-down registers on DM/DP:
1342 max3421_hcd->mode = (BIT(MAX3421_MODE_HOST_BIT) |
1343 BIT(MAX3421_MODE_SOFKAENAB_BIT) |
1344 BIT(MAX3421_MODE_DMPULLDN_BIT) |
1345 BIT(MAX3421_MODE_DPPULLDN_BIT));
1346 spi_wr8(hcd, MAX3421_REG_MODE, max3421_hcd->mode);
1348 /* reset frame-number: */
1349 max3421_hcd->frame_number = USB_MAX_FRAME_NUMBER;
1350 spi_wr8(hcd, MAX3421_REG_HCTL, BIT(MAX3421_HCTL_FRMRST_BIT));
1352 /* sample the state of the D+ and D- lines */
1353 spi_wr8(hcd, MAX3421_REG_HCTL, BIT(MAX3421_HCTL_SAMPLEBUS_BIT));
1354 max3421_detect_conn(hcd);
1356 /* enable frame, connection-detected, and bus-event interrupts: */
1357 max3421_hcd->hien = (BIT(MAX3421_HI_FRAME_BIT) |
1358 BIT(MAX3421_HI_CONDET_BIT) |
1359 BIT(MAX3421_HI_BUSEVENT_BIT));
1360 spi_wr8(hcd, MAX3421_REG_HIEN, max3421_hcd->hien);
1362 /* enable interrupts: */
1363 spi_wr8(hcd, MAX3421_REG_CPUCTL, BIT(MAX3421_CPUCTL_IE_BIT));
1368 max3421_urb_done(struct usb_hcd *hcd)
1370 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1371 unsigned long flags;
1375 status = max3421_hcd->urb_done;
1376 max3421_hcd->urb_done = 0;
1379 urb = max3421_hcd->curr_urb;
1381 max3421_hcd->curr_urb = NULL;
1382 spin_lock_irqsave(&max3421_hcd->lock, flags);
1383 usb_hcd_unlink_urb_from_ep(hcd, urb);
1384 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1386 /* must be called without the HCD spinlock: */
1387 usb_hcd_giveback_urb(hcd, urb, status);
1393 max3421_spi_thread(void *dev_id)
1395 struct usb_hcd *hcd = dev_id;
1396 struct spi_device *spi = to_spi_device(hcd->self.controller);
1397 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1398 int i, i_worked = 1;
1400 /* set full-duplex SPI mode, low-active interrupt pin: */
1401 spi_wr8(hcd, MAX3421_REG_PINCTL,
1402 (BIT(MAX3421_PINCTL_FDUPSPI_BIT) | /* full-duplex */
1403 BIT(MAX3421_PINCTL_INTLEVEL_BIT))); /* low-active irq */
1405 while (!kthread_should_stop()) {
1406 max3421_hcd->rev = spi_rd8(hcd, MAX3421_REG_REVISION);
1407 if (max3421_hcd->rev == 0x12 || max3421_hcd->rev == 0x13)
1409 dev_err(&spi->dev, "bad rev 0x%02x", max3421_hcd->rev);
1412 dev_info(&spi->dev, "rev 0x%x, SPI clk %dHz, bpw %u, irq %d\n",
1413 max3421_hcd->rev, spi->max_speed_hz, spi->bits_per_word,
1416 while (!kthread_should_stop()) {
1419 * We'll be waiting for wakeups from the hard
1420 * interrupt handler, so now is a good time to
1421 * sync our hien with the chip:
1423 spi_wr8(hcd, MAX3421_REG_HIEN, max3421_hcd->hien);
1425 set_current_state(TASK_INTERRUPTIBLE);
1426 if (max3421_hcd->do_enable_irq) {
1427 max3421_hcd->do_enable_irq = 0;
1428 enable_irq(spi->irq);
1431 __set_current_state(TASK_RUNNING);
1436 if (max3421_hcd->urb_done)
1437 i_worked |= max3421_urb_done(hcd);
1438 else if (max3421_handle_irqs(hcd))
1440 else if (!max3421_hcd->curr_urb)
1441 i_worked |= max3421_select_and_start_urb(hcd);
1443 if (max3421_hcd->do_reset_hcd) {
1444 /* reset the HCD: */
1445 max3421_hcd->do_reset_hcd = 0;
1446 i_worked |= max3421_reset_hcd(hcd);
1448 if (max3421_hcd->do_reset_port) {
1449 /* perform a USB bus reset: */
1450 max3421_hcd->do_reset_port = 0;
1451 spi_wr8(hcd, MAX3421_REG_HCTL,
1452 BIT(MAX3421_HCTL_BUSRST_BIT));
1455 if (max3421_hcd->do_check_unlink) {
1456 max3421_hcd->do_check_unlink = 0;
1457 i_worked |= max3421_check_unlink(hcd);
1459 if (max3421_hcd->do_iopin_update) {
1461 * IOPINS1/IOPINS2 do not auto-increment, so we can't
1464 for (i = 0; i < ARRAY_SIZE(max3421_hcd->iopins); ++i) {
1465 u8 val = spi_rd8(hcd, MAX3421_REG_IOPINS1);
1467 val = ((val & 0xf0) |
1468 (max3421_hcd->iopins[i] & 0x0f));
1469 spi_wr8(hcd, MAX3421_REG_IOPINS1 + i, val);
1470 max3421_hcd->iopins[i] = val;
1472 max3421_hcd->do_iopin_update = 0;
1476 set_current_state(TASK_RUNNING);
1477 dev_info(&spi->dev, "SPI thread exiting");
1482 max3421_reset_port(struct usb_hcd *hcd)
1484 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1486 max3421_hcd->port_status &= ~(USB_PORT_STAT_ENABLE |
1487 USB_PORT_STAT_LOW_SPEED);
1488 max3421_hcd->do_reset_port = 1;
1489 wake_up_process(max3421_hcd->spi_thread);
1494 max3421_reset(struct usb_hcd *hcd)
1496 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1498 hcd->self.sg_tablesize = 0;
1499 hcd->speed = HCD_USB2;
1500 hcd->self.root_hub->speed = USB_SPEED_FULL;
1501 max3421_hcd->do_reset_hcd = 1;
1502 wake_up_process(max3421_hcd->spi_thread);
1507 max3421_start(struct usb_hcd *hcd)
1509 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1511 spin_lock_init(&max3421_hcd->lock);
1512 max3421_hcd->rh_state = MAX3421_RH_RUNNING;
1514 INIT_LIST_HEAD(&max3421_hcd->ep_list);
1516 hcd->power_budget = POWER_BUDGET;
1517 hcd->state = HC_STATE_RUNNING;
1518 hcd->uses_new_polling = 1;
1523 max3421_stop(struct usb_hcd *hcd)
1528 max3421_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
1530 struct spi_device *spi = to_spi_device(hcd->self.controller);
1531 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1532 struct max3421_ep *max3421_ep;
1533 unsigned long flags;
1536 switch (usb_pipetype(urb->pipe)) {
1537 case PIPE_INTERRUPT:
1538 case PIPE_ISOCHRONOUS:
1539 if (urb->interval < 0) {
1541 "%s: interval=%d for intr-/iso-pipe; expected > 0\n",
1542 __func__, urb->interval);
1549 spin_lock_irqsave(&max3421_hcd->lock, flags);
1551 max3421_ep = urb->ep->hcpriv;
1553 /* gets freed in max3421_endpoint_disable: */
1554 max3421_ep = kzalloc(sizeof(struct max3421_ep), mem_flags);
1559 max3421_ep->ep = urb->ep;
1560 max3421_ep->last_active = max3421_hcd->frame_number;
1561 urb->ep->hcpriv = max3421_ep;
1563 list_add_tail(&max3421_ep->ep_list, &max3421_hcd->ep_list);
1566 retval = usb_hcd_link_urb_to_ep(hcd, urb);
1568 /* Since we added to the queue, restart scheduling: */
1569 max3421_hcd->sched_pass = SCHED_PASS_PERIODIC;
1570 wake_up_process(max3421_hcd->spi_thread);
1574 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1579 max3421_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1581 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1582 unsigned long flags;
1585 spin_lock_irqsave(&max3421_hcd->lock, flags);
1588 * This will set urb->unlinked which in turn causes the entry
1589 * to be dropped at the next opportunity.
1591 retval = usb_hcd_check_unlink_urb(hcd, urb, status);
1593 max3421_hcd->do_check_unlink = 1;
1594 wake_up_process(max3421_hcd->spi_thread);
1596 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1601 max3421_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
1603 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1604 unsigned long flags;
1606 spin_lock_irqsave(&max3421_hcd->lock, flags);
1609 struct max3421_ep *max3421_ep = ep->hcpriv;
1611 /* remove myself from the ep_list: */
1612 if (!list_empty(&max3421_ep->ep_list))
1613 list_del(&max3421_ep->ep_list);
1618 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1622 max3421_get_frame_number(struct usb_hcd *hcd)
1624 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1625 return max3421_hcd->frame_number;
1629 * Should return a non-zero value when any port is undergoing a resume
1630 * transition while the root hub is suspended.
1633 max3421_hub_status_data(struct usb_hcd *hcd, char *buf)
1635 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1636 unsigned long flags;
1639 spin_lock_irqsave(&max3421_hcd->lock, flags);
1640 if (!HCD_HW_ACCESSIBLE(hcd))
1644 if ((max3421_hcd->port_status & PORT_C_MASK) != 0) {
1645 *buf = (1 << 1); /* a hub over-current condition exists */
1646 dev_dbg(hcd->self.controller,
1647 "port status 0x%08x has changes\n",
1648 max3421_hcd->port_status);
1650 if (max3421_hcd->rh_state == MAX3421_RH_SUSPENDED)
1651 usb_hcd_resume_root_hub(hcd);
1654 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1659 hub_descriptor(struct usb_hub_descriptor *desc)
1661 memset(desc, 0, sizeof(*desc));
1663 * See Table 11-13: Hub Descriptor in USB 2.0 spec.
1665 desc->bDescriptorType = 0x29; /* hub descriptor */
1666 desc->bDescLength = 9;
1667 desc->wHubCharacteristics = cpu_to_le16(0x0001);
1668 desc->bNbrPorts = 1;
1672 * Set the MAX3421E general-purpose output with number PIN_NUMBER to
1673 * VALUE (0 or 1). PIN_NUMBER may be in the range from 1-8. For
1674 * any other value, this function acts as a no-op.
1677 max3421_gpout_set_value(struct usb_hcd *hcd, u8 pin_number, u8 value)
1679 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1686 mask = 1u << pin_number;
1687 idx = pin_number / 4;
1690 max3421_hcd->iopins[idx] |= mask;
1692 max3421_hcd->iopins[idx] &= ~mask;
1693 max3421_hcd->do_iopin_update = 1;
1694 wake_up_process(max3421_hcd->spi_thread);
1698 max3421_hub_control(struct usb_hcd *hcd, u16 type_req, u16 value, u16 index,
1699 char *buf, u16 length)
1701 struct spi_device *spi = to_spi_device(hcd->self.controller);
1702 struct max3421_hcd *max3421_hcd = hcd_to_max3421(hcd);
1703 struct max3421_hcd_platform_data *pdata;
1704 unsigned long flags;
1707 spin_lock_irqsave(&max3421_hcd->lock, flags);
1709 pdata = spi->dev.platform_data;
1712 case ClearHubFeature:
1714 case ClearPortFeature:
1716 case USB_PORT_FEAT_SUSPEND:
1718 case USB_PORT_FEAT_POWER:
1719 dev_dbg(hcd->self.controller, "power-off\n");
1720 max3421_gpout_set_value(hcd, pdata->vbus_gpout,
1721 !pdata->vbus_active_level);
1724 max3421_hcd->port_status &= ~(1 << value);
1727 case GetHubDescriptor:
1728 hub_descriptor((struct usb_hub_descriptor *) buf);
1731 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
1732 case GetPortErrorCount:
1738 *(__le32 *) buf = cpu_to_le32(0);
1746 ((__le16 *) buf)[0] = cpu_to_le16(max3421_hcd->port_status);
1747 ((__le16 *) buf)[1] =
1748 cpu_to_le16(max3421_hcd->port_status >> 16);
1755 case SetPortFeature:
1757 case USB_PORT_FEAT_LINK_STATE:
1758 case USB_PORT_FEAT_U1_TIMEOUT:
1759 case USB_PORT_FEAT_U2_TIMEOUT:
1760 case USB_PORT_FEAT_BH_PORT_RESET:
1762 case USB_PORT_FEAT_SUSPEND:
1763 if (max3421_hcd->active)
1764 max3421_hcd->port_status |=
1765 USB_PORT_STAT_SUSPEND;
1767 case USB_PORT_FEAT_POWER:
1768 dev_dbg(hcd->self.controller, "power-on\n");
1769 max3421_hcd->port_status |= USB_PORT_STAT_POWER;
1770 max3421_gpout_set_value(hcd, pdata->vbus_gpout,
1771 pdata->vbus_active_level);
1773 case USB_PORT_FEAT_RESET:
1774 max3421_reset_port(hcd);
1777 if ((max3421_hcd->port_status & USB_PORT_STAT_POWER)
1779 max3421_hcd->port_status |= (1 << value);
1784 dev_dbg(hcd->self.controller,
1785 "hub control req%04x v%04x i%04x l%d\n",
1786 type_req, value, index, length);
1787 error: /* "protocol stall" on error */
1791 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1796 max3421_bus_suspend(struct usb_hcd *hcd)
1802 max3421_bus_resume(struct usb_hcd *hcd)
1808 * The SPI driver already takes care of DMA-mapping/unmapping, so no
1809 * reason to do it twice.
1812 max3421_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
1818 max3421_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1822 static struct hc_driver max3421_hcd_desc = {
1823 .description = "max3421",
1824 .product_desc = DRIVER_DESC,
1825 .hcd_priv_size = sizeof(struct max3421_hcd),
1827 .reset = max3421_reset,
1828 .start = max3421_start,
1829 .stop = max3421_stop,
1830 .get_frame_number = max3421_get_frame_number,
1831 .urb_enqueue = max3421_urb_enqueue,
1832 .urb_dequeue = max3421_urb_dequeue,
1833 .map_urb_for_dma = max3421_map_urb_for_dma,
1834 .unmap_urb_for_dma = max3421_unmap_urb_for_dma,
1835 .endpoint_disable = max3421_endpoint_disable,
1836 .hub_status_data = max3421_hub_status_data,
1837 .hub_control = max3421_hub_control,
1838 .bus_suspend = max3421_bus_suspend,
1839 .bus_resume = max3421_bus_resume,
1843 max3421_probe(struct spi_device *spi)
1845 struct max3421_hcd *max3421_hcd;
1846 struct usb_hcd *hcd = NULL;
1847 int retval = -ENOMEM;
1849 if (spi_setup(spi) < 0) {
1850 dev_err(&spi->dev, "Unable to setup SPI bus");
1854 hcd = usb_create_hcd(&max3421_hcd_desc, &spi->dev,
1855 dev_name(&spi->dev));
1857 dev_err(&spi->dev, "failed to create HCD structure\n");
1860 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1861 max3421_hcd = hcd_to_max3421(hcd);
1862 max3421_hcd->next = max3421_hcd_list;
1863 max3421_hcd_list = max3421_hcd;
1864 INIT_LIST_HEAD(&max3421_hcd->ep_list);
1866 max3421_hcd->tx = kmalloc(sizeof(*max3421_hcd->tx), GFP_KERNEL);
1867 if (!max3421_hcd->tx) {
1868 dev_err(&spi->dev, "failed to kmalloc tx buffer\n");
1871 max3421_hcd->rx = kmalloc(sizeof(*max3421_hcd->rx), GFP_KERNEL);
1872 if (!max3421_hcd->rx) {
1873 dev_err(&spi->dev, "failed to kmalloc rx buffer\n");
1877 max3421_hcd->spi_thread = kthread_run(max3421_spi_thread, hcd,
1878 "max3421_spi_thread");
1879 if (max3421_hcd->spi_thread == ERR_PTR(-ENOMEM)) {
1881 "failed to create SPI thread (out of memory)\n");
1885 retval = usb_add_hcd(hcd, 0, 0);
1887 dev_err(&spi->dev, "failed to add HCD\n");
1891 retval = request_irq(spi->irq, max3421_irq_handler,
1892 IRQF_TRIGGER_LOW, "max3421", hcd);
1894 dev_err(&spi->dev, "failed to request irq %d\n", spi->irq);
1901 kfree(max3421_hcd->tx);
1902 kfree(max3421_hcd->rx);
1903 if (max3421_hcd->spi_thread)
1904 kthread_stop(max3421_hcd->spi_thread);
1911 max3421_remove(struct spi_device *spi)
1913 struct max3421_hcd *max3421_hcd = NULL, **prev;
1914 struct usb_hcd *hcd = NULL;
1915 unsigned long flags;
1917 for (prev = &max3421_hcd_list; *prev; prev = &(*prev)->next) {
1918 max3421_hcd = *prev;
1919 hcd = max3421_to_hcd(max3421_hcd);
1920 if (hcd->self.controller == &spi->dev)
1924 dev_err(&spi->dev, "no MAX3421 HCD found for SPI device %p\n",
1929 usb_remove_hcd(hcd);
1931 spin_lock_irqsave(&max3421_hcd->lock, flags);
1933 kthread_stop(max3421_hcd->spi_thread);
1934 *prev = max3421_hcd->next;
1936 spin_unlock_irqrestore(&max3421_hcd->lock, flags);
1938 free_irq(spi->irq, hcd);
1944 static struct spi_driver max3421_driver = {
1945 .probe = max3421_probe,
1946 .remove = max3421_remove,
1948 .name = "max3421-hcd",
1949 .owner = THIS_MODULE,
1953 module_spi_driver(max3421_driver);
1955 MODULE_DESCRIPTION(DRIVER_DESC);
1956 MODULE_AUTHOR("David Mosberger <davidm@egauge.net>");
1957 MODULE_LICENSE("GPL");