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usb: usb_control_msg() propagate controller error code
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1 /*
2  * Most of this source has been derived from the Linux USB
3  * project:
4  * (C) Copyright Linus Torvalds 1999
5  * (C) Copyright Johannes Erdfelt 1999-2001
6  * (C) Copyright Andreas Gal 1999
7  * (C) Copyright Gregory P. Smith 1999
8  * (C) Copyright Deti Fliegl 1999 (new USB architecture)
9  * (C) Copyright Randy Dunlap 2000
10  * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
11  * (C) Copyright Yggdrasil Computing, Inc. 2000
12  *     (usb_device_id matching changes by Adam J. Richter)
13  *
14  * Adapted for U-Boot:
15  * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
16  *
17  * SPDX-License-Identifier:     GPL-2.0+
18  */
19
20 /*
21  * How it works:
22  *
23  * Since this is a bootloader, the devices will not be automatic
24  * (re)configured on hotplug, but after a restart of the USB the
25  * device should work.
26  *
27  * For each transfer (except "Interrupt") we wait for completion.
28  */
29 #include <common.h>
30 #include <command.h>
31 #include <dm.h>
32 #include <asm/processor.h>
33 #include <linux/compiler.h>
34 #include <linux/ctype.h>
35 #include <asm/byteorder.h>
36 #include <asm/unaligned.h>
37 #include <errno.h>
38 #include <usb.h>
39 #ifdef CONFIG_4xx
40 #include <asm/4xx_pci.h>
41 #endif
42
43 #define USB_BUFSIZ      512
44
45 static int asynch_allowed;
46 char usb_started; /* flag for the started/stopped USB status */
47
48 #ifndef CONFIG_DM_USB
49 static struct usb_device usb_dev[USB_MAX_DEVICE];
50 static int dev_index;
51
52 #ifndef CONFIG_USB_MAX_CONTROLLER_COUNT
53 #define CONFIG_USB_MAX_CONTROLLER_COUNT 1
54 #endif
55
56 /***************************************************************************
57  * Init USB Device
58  */
59 int usb_init(void)
60 {
61         void *ctrl;
62         struct usb_device *dev;
63         int i, start_index = 0;
64         int controllers_initialized = 0;
65         int ret;
66
67         dev_index = 0;
68         asynch_allowed = 1;
69         usb_hub_reset();
70
71         /* first make all devices unknown */
72         for (i = 0; i < USB_MAX_DEVICE; i++) {
73                 memset(&usb_dev[i], 0, sizeof(struct usb_device));
74                 usb_dev[i].devnum = -1;
75         }
76
77         /* init low_level USB */
78         for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
79                 /* init low_level USB */
80                 printf("USB%d:   ", i);
81                 ret = usb_lowlevel_init(i, USB_INIT_HOST, &ctrl);
82                 if (ret == -ENODEV) {   /* No such device. */
83                         puts("Port not available.\n");
84                         controllers_initialized++;
85                         continue;
86                 }
87
88                 if (ret) {              /* Other error. */
89                         puts("lowlevel init failed\n");
90                         continue;
91                 }
92                 /*
93                  * lowlevel init is OK, now scan the bus for devices
94                  * i.e. search HUBs and configure them
95                  */
96                 controllers_initialized++;
97                 start_index = dev_index;
98                 printf("scanning bus %d for devices... ", i);
99                 ret = usb_alloc_new_device(ctrl, &dev);
100                 if (ret)
101                         break;
102
103                 /*
104                  * device 0 is always present
105                  * (root hub, so let it analyze)
106                  */
107                 ret = usb_new_device(dev);
108                 if (ret)
109                         usb_free_device(dev->controller);
110
111                 if (start_index == dev_index) {
112                         puts("No USB Device found\n");
113                         continue;
114                 } else {
115                         printf("%d USB Device(s) found\n",
116                                 dev_index - start_index);
117                 }
118
119                 usb_started = 1;
120         }
121
122         debug("scan end\n");
123         /* if we were not able to find at least one working bus, bail out */
124         if (controllers_initialized == 0)
125                 puts("USB error: all controllers failed lowlevel init\n");
126
127         return usb_started ? 0 : -ENODEV;
128 }
129
130 /******************************************************************************
131  * Stop USB this stops the LowLevel Part and deregisters USB devices.
132  */
133 int usb_stop(void)
134 {
135         int i;
136
137         if (usb_started) {
138                 asynch_allowed = 1;
139                 usb_started = 0;
140                 usb_hub_reset();
141
142                 for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
143                         if (usb_lowlevel_stop(i))
144                                 printf("failed to stop USB controller %d\n", i);
145                 }
146         }
147
148         return 0;
149 }
150
151 /*
152  * disables the asynch behaviour of the control message. This is used for data
153  * transfers that uses the exclusiv access to the control and bulk messages.
154  * Returns the old value so it can be restored later.
155  */
156 int usb_disable_asynch(int disable)
157 {
158         int old_value = asynch_allowed;
159
160         asynch_allowed = !disable;
161         return old_value;
162 }
163 #endif /* !CONFIG_DM_USB */
164
165
166 /*-------------------------------------------------------------------
167  * Message wrappers.
168  *
169  */
170
171 /*
172  * submits an Interrupt Message
173  */
174 int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,
175                         void *buffer, int transfer_len, int interval)
176 {
177         return submit_int_msg(dev, pipe, buffer, transfer_len, interval);
178 }
179
180 /*
181  * submits a control message and waits for comletion (at least timeout * 1ms)
182  * If timeout is 0, we don't wait for completion (used as example to set and
183  * clear keyboards LEDs). For data transfers, (storage transfers) we don't
184  * allow control messages with 0 timeout, by previousely resetting the flag
185  * asynch_allowed (usb_disable_asynch(1)).
186  * returns the transfered length if OK or -1 if error. The transfered length
187  * and the current status are stored in the dev->act_len and dev->status.
188  */
189 int usb_control_msg(struct usb_device *dev, unsigned int pipe,
190                         unsigned char request, unsigned char requesttype,
191                         unsigned short value, unsigned short index,
192                         void *data, unsigned short size, int timeout)
193 {
194         ALLOC_CACHE_ALIGN_BUFFER(struct devrequest, setup_packet, 1);
195         int err;
196
197         if ((timeout == 0) && (!asynch_allowed)) {
198                 /* request for a asynch control pipe is not allowed */
199                 return -EINVAL;
200         }
201
202         /* set setup command */
203         setup_packet->requesttype = requesttype;
204         setup_packet->request = request;
205         setup_packet->value = cpu_to_le16(value);
206         setup_packet->index = cpu_to_le16(index);
207         setup_packet->length = cpu_to_le16(size);
208         debug("usb_control_msg: request: 0x%X, requesttype: 0x%X, " \
209               "value 0x%X index 0x%X length 0x%X\n",
210               request, requesttype, value, index, size);
211         dev->status = USB_ST_NOT_PROC; /*not yet processed */
212
213         err = submit_control_msg(dev, pipe, data, size, setup_packet);
214         if (err < 0)
215                 return err;
216         if (timeout == 0)
217                 return (int)size;
218
219         /*
220          * Wait for status to update until timeout expires, USB driver
221          * interrupt handler may set the status when the USB operation has
222          * been completed.
223          */
224         while (timeout--) {
225                 if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
226                         break;
227                 mdelay(1);
228         }
229         if (dev->status)
230                 return -1;
231
232         return dev->act_len;
233
234 }
235
236 /*-------------------------------------------------------------------
237  * submits bulk message, and waits for completion. returns 0 if Ok or
238  * negative if Error.
239  * synchronous behavior
240  */
241 int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
242                         void *data, int len, int *actual_length, int timeout)
243 {
244         if (len < 0)
245                 return -EINVAL;
246         dev->status = USB_ST_NOT_PROC; /*not yet processed */
247         if (submit_bulk_msg(dev, pipe, data, len) < 0)
248                 return -EIO;
249         while (timeout--) {
250                 if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
251                         break;
252                 mdelay(1);
253         }
254         *actual_length = dev->act_len;
255         if (dev->status == 0)
256                 return 0;
257         else
258                 return -EIO;
259 }
260
261
262 /*-------------------------------------------------------------------
263  * Max Packet stuff
264  */
265
266 /*
267  * returns the max packet size, depending on the pipe direction and
268  * the configurations values
269  */
270 int usb_maxpacket(struct usb_device *dev, unsigned long pipe)
271 {
272         /* direction is out -> use emaxpacket out */
273         if ((pipe & USB_DIR_IN) == 0)
274                 return dev->epmaxpacketout[((pipe>>15) & 0xf)];
275         else
276                 return dev->epmaxpacketin[((pipe>>15) & 0xf)];
277 }
278
279 /*
280  * The routine usb_set_maxpacket_ep() is extracted from the loop of routine
281  * usb_set_maxpacket(), because the optimizer of GCC 4.x chokes on this routine
282  * when it is inlined in 1 single routine. What happens is that the register r3
283  * is used as loop-count 'i', but gets overwritten later on.
284  * This is clearly a compiler bug, but it is easier to workaround it here than
285  * to update the compiler (Occurs with at least several GCC 4.{1,2},x
286  * CodeSourcery compilers like e.g. 2007q3, 2008q1, 2008q3 lite editions on ARM)
287  *
288  * NOTE: Similar behaviour was observed with GCC4.6 on ARMv5.
289  */
290 static void noinline
291 usb_set_maxpacket_ep(struct usb_device *dev, int if_idx, int ep_idx)
292 {
293         int b;
294         struct usb_endpoint_descriptor *ep;
295         u16 ep_wMaxPacketSize;
296
297         ep = &dev->config.if_desc[if_idx].ep_desc[ep_idx];
298
299         b = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
300         ep_wMaxPacketSize = get_unaligned(&ep->wMaxPacketSize);
301
302         if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
303                                                 USB_ENDPOINT_XFER_CONTROL) {
304                 /* Control => bidirectional */
305                 dev->epmaxpacketout[b] = ep_wMaxPacketSize;
306                 dev->epmaxpacketin[b] = ep_wMaxPacketSize;
307                 debug("##Control EP epmaxpacketout/in[%d] = %d\n",
308                       b, dev->epmaxpacketin[b]);
309         } else {
310                 if ((ep->bEndpointAddress & 0x80) == 0) {
311                         /* OUT Endpoint */
312                         if (ep_wMaxPacketSize > dev->epmaxpacketout[b]) {
313                                 dev->epmaxpacketout[b] = ep_wMaxPacketSize;
314                                 debug("##EP epmaxpacketout[%d] = %d\n",
315                                       b, dev->epmaxpacketout[b]);
316                         }
317                 } else {
318                         /* IN Endpoint */
319                         if (ep_wMaxPacketSize > dev->epmaxpacketin[b]) {
320                                 dev->epmaxpacketin[b] = ep_wMaxPacketSize;
321                                 debug("##EP epmaxpacketin[%d] = %d\n",
322                                       b, dev->epmaxpacketin[b]);
323                         }
324                 } /* if out */
325         } /* if control */
326 }
327
328 /*
329  * set the max packed value of all endpoints in the given configuration
330  */
331 static int usb_set_maxpacket(struct usb_device *dev)
332 {
333         int i, ii;
334
335         for (i = 0; i < dev->config.desc.bNumInterfaces; i++)
336                 for (ii = 0; ii < dev->config.if_desc[i].desc.bNumEndpoints; ii++)
337                         usb_set_maxpacket_ep(dev, i, ii);
338
339         return 0;
340 }
341
342 /*******************************************************************************
343  * Parse the config, located in buffer, and fills the dev->config structure.
344  * Note that all little/big endian swapping are done automatically.
345  * (wTotalLength has already been swapped and sanitized when it was read.)
346  */
347 static int usb_parse_config(struct usb_device *dev,
348                         unsigned char *buffer, int cfgno)
349 {
350         struct usb_descriptor_header *head;
351         int index, ifno, epno, curr_if_num;
352         u16 ep_wMaxPacketSize;
353         struct usb_interface *if_desc = NULL;
354
355         ifno = -1;
356         epno = -1;
357         curr_if_num = -1;
358
359         dev->configno = cfgno;
360         head = (struct usb_descriptor_header *) &buffer[0];
361         if (head->bDescriptorType != USB_DT_CONFIG) {
362                 printf(" ERROR: NOT USB_CONFIG_DESC %x\n",
363                         head->bDescriptorType);
364                 return -EINVAL;
365         }
366         if (head->bLength != USB_DT_CONFIG_SIZE) {
367                 printf("ERROR: Invalid USB CFG length (%d)\n", head->bLength);
368                 return -EINVAL;
369         }
370         memcpy(&dev->config, head, USB_DT_CONFIG_SIZE);
371         dev->config.no_of_if = 0;
372
373         index = dev->config.desc.bLength;
374         /* Ok the first entry must be a configuration entry,
375          * now process the others */
376         head = (struct usb_descriptor_header *) &buffer[index];
377         while (index + 1 < dev->config.desc.wTotalLength && head->bLength) {
378                 switch (head->bDescriptorType) {
379                 case USB_DT_INTERFACE:
380                         if (head->bLength != USB_DT_INTERFACE_SIZE) {
381                                 printf("ERROR: Invalid USB IF length (%d)\n",
382                                         head->bLength);
383                                 break;
384                         }
385                         if (index + USB_DT_INTERFACE_SIZE >
386                             dev->config.desc.wTotalLength) {
387                                 puts("USB IF descriptor overflowed buffer!\n");
388                                 break;
389                         }
390                         if (((struct usb_interface_descriptor *) \
391                              head)->bInterfaceNumber != curr_if_num) {
392                                 /* this is a new interface, copy new desc */
393                                 ifno = dev->config.no_of_if;
394                                 if (ifno >= USB_MAXINTERFACES) {
395                                         puts("Too many USB interfaces!\n");
396                                         /* try to go on with what we have */
397                                         return -EINVAL;
398                                 }
399                                 if_desc = &dev->config.if_desc[ifno];
400                                 dev->config.no_of_if++;
401                                 memcpy(if_desc, head,
402                                         USB_DT_INTERFACE_SIZE);
403                                 if_desc->no_of_ep = 0;
404                                 if_desc->num_altsetting = 1;
405                                 curr_if_num =
406                                      if_desc->desc.bInterfaceNumber;
407                         } else {
408                                 /* found alternate setting for the interface */
409                                 if (ifno >= 0) {
410                                         if_desc = &dev->config.if_desc[ifno];
411                                         if_desc->num_altsetting++;
412                                 }
413                         }
414                         break;
415                 case USB_DT_ENDPOINT:
416                         if (head->bLength != USB_DT_ENDPOINT_SIZE) {
417                                 printf("ERROR: Invalid USB EP length (%d)\n",
418                                         head->bLength);
419                                 break;
420                         }
421                         if (index + USB_DT_ENDPOINT_SIZE >
422                             dev->config.desc.wTotalLength) {
423                                 puts("USB EP descriptor overflowed buffer!\n");
424                                 break;
425                         }
426                         if (ifno < 0) {
427                                 puts("Endpoint descriptor out of order!\n");
428                                 break;
429                         }
430                         epno = dev->config.if_desc[ifno].no_of_ep;
431                         if_desc = &dev->config.if_desc[ifno];
432                         if (epno > USB_MAXENDPOINTS) {
433                                 printf("Interface %d has too many endpoints!\n",
434                                         if_desc->desc.bInterfaceNumber);
435                                 return -EINVAL;
436                         }
437                         /* found an endpoint */
438                         if_desc->no_of_ep++;
439                         memcpy(&if_desc->ep_desc[epno], head,
440                                 USB_DT_ENDPOINT_SIZE);
441                         ep_wMaxPacketSize = get_unaligned(&dev->config.\
442                                                         if_desc[ifno].\
443                                                         ep_desc[epno].\
444                                                         wMaxPacketSize);
445                         put_unaligned(le16_to_cpu(ep_wMaxPacketSize),
446                                         &dev->config.\
447                                         if_desc[ifno].\
448                                         ep_desc[epno].\
449                                         wMaxPacketSize);
450                         debug("if %d, ep %d\n", ifno, epno);
451                         break;
452                 case USB_DT_SS_ENDPOINT_COMP:
453                         if (head->bLength != USB_DT_SS_EP_COMP_SIZE) {
454                                 printf("ERROR: Invalid USB EPC length (%d)\n",
455                                         head->bLength);
456                                 break;
457                         }
458                         if (index + USB_DT_SS_EP_COMP_SIZE >
459                             dev->config.desc.wTotalLength) {
460                                 puts("USB EPC descriptor overflowed buffer!\n");
461                                 break;
462                         }
463                         if (ifno < 0 || epno < 0) {
464                                 puts("EPC descriptor out of order!\n");
465                                 break;
466                         }
467                         if_desc = &dev->config.if_desc[ifno];
468                         memcpy(&if_desc->ss_ep_comp_desc[epno], head,
469                                 USB_DT_SS_EP_COMP_SIZE);
470                         break;
471                 default:
472                         if (head->bLength == 0)
473                                 return -EINVAL;
474
475                         debug("unknown Description Type : %x\n",
476                               head->bDescriptorType);
477
478 #ifdef DEBUG
479                         {
480                                 unsigned char *ch = (unsigned char *)head;
481                                 int i;
482
483                                 for (i = 0; i < head->bLength; i++)
484                                         debug("%02X ", *ch++);
485                                 debug("\n\n\n");
486                         }
487 #endif
488                         break;
489                 }
490                 index += head->bLength;
491                 head = (struct usb_descriptor_header *)&buffer[index];
492         }
493         return 0;
494 }
495
496 /***********************************************************************
497  * Clears an endpoint
498  * endp: endpoint number in bits 0-3;
499  * direction flag in bit 7 (1 = IN, 0 = OUT)
500  */
501 int usb_clear_halt(struct usb_device *dev, int pipe)
502 {
503         int result;
504         int endp = usb_pipeendpoint(pipe)|(usb_pipein(pipe)<<7);
505
506         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
507                                  USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 0,
508                                  endp, NULL, 0, USB_CNTL_TIMEOUT * 3);
509
510         /* don't clear if failed */
511         if (result < 0)
512                 return result;
513
514         /*
515          * NOTE: we do not get status and verify reset was successful
516          * as some devices are reported to lock up upon this check..
517          */
518
519         usb_endpoint_running(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
520
521         /* toggle is reset on clear */
522         usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 0);
523         return 0;
524 }
525
526
527 /**********************************************************************
528  * get_descriptor type
529  */
530 static int usb_get_descriptor(struct usb_device *dev, unsigned char type,
531                         unsigned char index, void *buf, int size)
532 {
533         int res;
534         res = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
535                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
536                         (type << 8) + index, 0,
537                         buf, size, USB_CNTL_TIMEOUT);
538         return res;
539 }
540
541 /**********************************************************************
542  * gets configuration cfgno and store it in the buffer
543  */
544 int usb_get_configuration_no(struct usb_device *dev,
545                              unsigned char *buffer, int cfgno)
546 {
547         int result;
548         unsigned int length;
549         struct usb_config_descriptor *config;
550
551         config = (struct usb_config_descriptor *)&buffer[0];
552         result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, 9);
553         if (result < 9) {
554                 if (result < 0)
555                         printf("unable to get descriptor, error %lX\n",
556                                 dev->status);
557                 else
558                         printf("config descriptor too short " \
559                                 "(expected %i, got %i)\n", 9, result);
560                 return -EIO;
561         }
562         length = le16_to_cpu(config->wTotalLength);
563
564         if (length > USB_BUFSIZ) {
565                 printf("%s: failed to get descriptor - too long: %d\n",
566                         __func__, length);
567                 return -EIO;
568         }
569
570         result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, length);
571         debug("get_conf_no %d Result %d, wLength %d\n", cfgno, result, length);
572         config->wTotalLength = length; /* validated, with CPU byte order */
573
574         return result;
575 }
576
577 /********************************************************************
578  * set address of a device to the value in dev->devnum.
579  * This can only be done by addressing the device via the default address (0)
580  */
581 static int usb_set_address(struct usb_device *dev)
582 {
583         int res;
584
585         debug("set address %d\n", dev->devnum);
586         res = usb_control_msg(dev, usb_snddefctrl(dev),
587                                 USB_REQ_SET_ADDRESS, 0,
588                                 (dev->devnum), 0,
589                                 NULL, 0, USB_CNTL_TIMEOUT);
590         return res;
591 }
592
593 /********************************************************************
594  * set interface number to interface
595  */
596 int usb_set_interface(struct usb_device *dev, int interface, int alternate)
597 {
598         struct usb_interface *if_face = NULL;
599         int ret, i;
600
601         for (i = 0; i < dev->config.desc.bNumInterfaces; i++) {
602                 if (dev->config.if_desc[i].desc.bInterfaceNumber == interface) {
603                         if_face = &dev->config.if_desc[i];
604                         break;
605                 }
606         }
607         if (!if_face) {
608                 printf("selecting invalid interface %d", interface);
609                 return -EINVAL;
610         }
611         /*
612          * We should return now for devices with only one alternate setting.
613          * According to 9.4.10 of the Universal Serial Bus Specification
614          * Revision 2.0 such devices can return with a STALL. This results in
615          * some USB sticks timeouting during initialization and then being
616          * unusable in U-Boot.
617          */
618         if (if_face->num_altsetting == 1)
619                 return 0;
620
621         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
622                                 USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE,
623                                 alternate, interface, NULL, 0,
624                                 USB_CNTL_TIMEOUT * 5);
625         if (ret < 0)
626                 return ret;
627
628         return 0;
629 }
630
631 /********************************************************************
632  * set configuration number to configuration
633  */
634 static int usb_set_configuration(struct usb_device *dev, int configuration)
635 {
636         int res;
637         debug("set configuration %d\n", configuration);
638         /* set setup command */
639         res = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
640                                 USB_REQ_SET_CONFIGURATION, 0,
641                                 configuration, 0,
642                                 NULL, 0, USB_CNTL_TIMEOUT);
643         if (res == 0) {
644                 dev->toggle[0] = 0;
645                 dev->toggle[1] = 0;
646                 return 0;
647         } else
648                 return -EIO;
649 }
650
651 /********************************************************************
652  * set protocol to protocol
653  */
654 int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol)
655 {
656         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
657                 USB_REQ_SET_PROTOCOL, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
658                 protocol, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
659 }
660
661 /********************************************************************
662  * set idle
663  */
664 int usb_set_idle(struct usb_device *dev, int ifnum, int duration, int report_id)
665 {
666         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
667                 USB_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
668                 (duration << 8) | report_id, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
669 }
670
671 /********************************************************************
672  * get report
673  */
674 int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
675                    unsigned char id, void *buf, int size)
676 {
677         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
678                         USB_REQ_GET_REPORT,
679                         USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
680                         (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
681 }
682
683 /********************************************************************
684  * get class descriptor
685  */
686 int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
687                 unsigned char type, unsigned char id, void *buf, int size)
688 {
689         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
690                 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
691                 (type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
692 }
693
694 /********************************************************************
695  * get string index in buffer
696  */
697 static int usb_get_string(struct usb_device *dev, unsigned short langid,
698                    unsigned char index, void *buf, int size)
699 {
700         int i;
701         int result;
702
703         for (i = 0; i < 3; ++i) {
704                 /* some devices are flaky */
705                 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
706                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
707                         (USB_DT_STRING << 8) + index, langid, buf, size,
708                         USB_CNTL_TIMEOUT);
709
710                 if (result > 0)
711                         break;
712         }
713
714         return result;
715 }
716
717
718 static void usb_try_string_workarounds(unsigned char *buf, int *length)
719 {
720         int newlength, oldlength = *length;
721
722         for (newlength = 2; newlength + 1 < oldlength; newlength += 2)
723                 if (!isprint(buf[newlength]) || buf[newlength + 1])
724                         break;
725
726         if (newlength > 2) {
727                 buf[0] = newlength;
728                 *length = newlength;
729         }
730 }
731
732
733 static int usb_string_sub(struct usb_device *dev, unsigned int langid,
734                 unsigned int index, unsigned char *buf)
735 {
736         int rc;
737
738         /* Try to read the string descriptor by asking for the maximum
739          * possible number of bytes */
740         rc = usb_get_string(dev, langid, index, buf, 255);
741
742         /* If that failed try to read the descriptor length, then
743          * ask for just that many bytes */
744         if (rc < 2) {
745                 rc = usb_get_string(dev, langid, index, buf, 2);
746                 if (rc == 2)
747                         rc = usb_get_string(dev, langid, index, buf, buf[0]);
748         }
749
750         if (rc >= 2) {
751                 if (!buf[0] && !buf[1])
752                         usb_try_string_workarounds(buf, &rc);
753
754                 /* There might be extra junk at the end of the descriptor */
755                 if (buf[0] < rc)
756                         rc = buf[0];
757
758                 rc = rc - (rc & 1); /* force a multiple of two */
759         }
760
761         if (rc < 2)
762                 rc = -EINVAL;
763
764         return rc;
765 }
766
767
768 /********************************************************************
769  * usb_string:
770  * Get string index and translate it to ascii.
771  * returns string length (> 0) or error (< 0)
772  */
773 int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
774 {
775         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, mybuf, USB_BUFSIZ);
776         unsigned char *tbuf;
777         int err;
778         unsigned int u, idx;
779
780         if (size <= 0 || !buf || !index)
781                 return -EINVAL;
782         buf[0] = 0;
783         tbuf = &mybuf[0];
784
785         /* get langid for strings if it's not yet known */
786         if (!dev->have_langid) {
787                 err = usb_string_sub(dev, 0, 0, tbuf);
788                 if (err < 0) {
789                         debug("error getting string descriptor 0 " \
790                               "(error=%lx)\n", dev->status);
791                         return -EIO;
792                 } else if (tbuf[0] < 4) {
793                         debug("string descriptor 0 too short\n");
794                         return -EIO;
795                 } else {
796                         dev->have_langid = -1;
797                         dev->string_langid = tbuf[2] | (tbuf[3] << 8);
798                                 /* always use the first langid listed */
799                         debug("USB device number %d default " \
800                               "language ID 0x%x\n",
801                               dev->devnum, dev->string_langid);
802                 }
803         }
804
805         err = usb_string_sub(dev, dev->string_langid, index, tbuf);
806         if (err < 0)
807                 return err;
808
809         size--;         /* leave room for trailing NULL char in output buffer */
810         for (idx = 0, u = 2; u < err; u += 2) {
811                 if (idx >= size)
812                         break;
813                 if (tbuf[u+1])                  /* high byte */
814                         buf[idx++] = '?';  /* non-ASCII character */
815                 else
816                         buf[idx++] = tbuf[u];
817         }
818         buf[idx] = 0;
819         err = idx;
820         return err;
821 }
822
823
824 /********************************************************************
825  * USB device handling:
826  * the USB device are static allocated [USB_MAX_DEVICE].
827  */
828
829 #ifndef CONFIG_DM_USB
830
831 /* returns a pointer to the device with the index [index].
832  * if the device is not assigned (dev->devnum==-1) returns NULL
833  */
834 struct usb_device *usb_get_dev_index(int index)
835 {
836         if (usb_dev[index].devnum == -1)
837                 return NULL;
838         else
839                 return &usb_dev[index];
840 }
841
842 int usb_alloc_new_device(struct udevice *controller, struct usb_device **devp)
843 {
844         int i;
845         debug("New Device %d\n", dev_index);
846         if (dev_index == USB_MAX_DEVICE) {
847                 printf("ERROR, too many USB Devices, max=%d\n", USB_MAX_DEVICE);
848                 return -ENOSPC;
849         }
850         /* default Address is 0, real addresses start with 1 */
851         usb_dev[dev_index].devnum = dev_index + 1;
852         usb_dev[dev_index].maxchild = 0;
853         for (i = 0; i < USB_MAXCHILDREN; i++)
854                 usb_dev[dev_index].children[i] = NULL;
855         usb_dev[dev_index].parent = NULL;
856         usb_dev[dev_index].controller = controller;
857         dev_index++;
858         *devp = &usb_dev[dev_index - 1];
859
860         return 0;
861 }
862
863 /*
864  * Free the newly created device node.
865  * Called in error cases where configuring a newly attached
866  * device fails for some reason.
867  */
868 void usb_free_device(struct udevice *controller)
869 {
870         dev_index--;
871         debug("Freeing device node: %d\n", dev_index);
872         memset(&usb_dev[dev_index], 0, sizeof(struct usb_device));
873         usb_dev[dev_index].devnum = -1;
874 }
875
876 /*
877  * XHCI issues Enable Slot command and thereafter
878  * allocates device contexts. Provide a weak alias
879  * function for the purpose, so that XHCI overrides it
880  * and EHCI/OHCI just work out of the box.
881  */
882 __weak int usb_alloc_device(struct usb_device *udev)
883 {
884         return 0;
885 }
886 #endif /* !CONFIG_DM_USB */
887
888 #ifndef CONFIG_DM_USB
889 int usb_legacy_port_reset(struct usb_device *hub, int portnr)
890 {
891         if (hub) {
892                 unsigned short portstatus;
893                 int err;
894
895                 /* reset the port for the second time */
896                 err = legacy_hub_port_reset(hub, portnr - 1, &portstatus);
897                 if (err < 0) {
898                         printf("\n     Couldn't reset port %i\n", portnr);
899                         return err;
900                 }
901         } else {
902                 usb_reset_root_port();
903         }
904
905         return 0;
906 }
907 #endif
908
909 static int get_descriptor_len(struct usb_device *dev, int len, int expect_len)
910 {
911         __maybe_unused struct usb_device_descriptor *desc;
912         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ);
913         int err;
914
915         desc = (struct usb_device_descriptor *)tmpbuf;
916
917         err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, len);
918         if (err < expect_len) {
919                 if (err < 0) {
920                         printf("unable to get device descriptor (error=%d)\n",
921                                 err);
922                         return err;
923                 } else {
924                         printf("USB device descriptor short read (expected %i, got %i)\n",
925                                 expect_len, err);
926                         return -EIO;
927                 }
928         }
929         memcpy(&dev->descriptor, tmpbuf, sizeof(dev->descriptor));
930
931         return 0;
932 }
933
934 static int usb_setup_descriptor(struct usb_device *dev, bool do_read)
935 {
936         __maybe_unused struct usb_device_descriptor *desc;
937
938         /*
939          * This is a Windows scheme of initialization sequence, with double
940          * reset of the device (Linux uses the same sequence)
941          * Some equipment is said to work only with such init sequence; this
942          * patch is based on the work by Alan Stern:
943          * http://sourceforge.net/mailarchive/forum.php?
944          * thread_id=5729457&forum_id=5398
945          */
946
947         /*
948          * send 64-byte GET-DEVICE-DESCRIPTOR request.  Since the descriptor is
949          * only 18 bytes long, this will terminate with a short packet.  But if
950          * the maxpacket size is 8 or 16 the device may be waiting to transmit
951          * some more, or keeps on retransmitting the 8 byte header.
952          */
953
954         if (dev->speed == USB_SPEED_LOW) {
955                 dev->descriptor.bMaxPacketSize0 = 8;
956                 dev->maxpacketsize = PACKET_SIZE_8;
957         } else {
958                 dev->descriptor.bMaxPacketSize0 = 64;
959                 dev->maxpacketsize = PACKET_SIZE_64;
960         }
961         dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;
962         dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;
963
964         if (do_read) {
965                 int err;
966
967                 /*
968                  * Validate we've received only at least 8 bytes, not that we've
969                  * received the entire descriptor. The reasoning is:
970                  * - The code only uses fields in the first 8 bytes, so that's all we
971                  *   need to have fetched at this stage.
972                  * - The smallest maxpacket size is 8 bytes. Before we know the actual
973                  *   maxpacket the device uses, the USB controller may only accept a
974                  *   single packet. Consequently we are only guaranteed to receive 1
975                  *   packet (at least 8 bytes) even in a non-error case.
976                  *
977                  * At least the DWC2 controller needs to be programmed with the number
978                  * of packets in addition to the number of bytes. A request for 64
979                  * bytes of data with the maxpacket guessed as 64 (above) yields a
980                  * request for 1 packet.
981                  */
982                 err = get_descriptor_len(dev, 64, 8);
983                 if (err)
984                         return err;
985         }
986
987         dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;
988         dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;
989         switch (dev->descriptor.bMaxPacketSize0) {
990         case 8:
991                 dev->maxpacketsize  = PACKET_SIZE_8;
992                 break;
993         case 16:
994                 dev->maxpacketsize = PACKET_SIZE_16;
995                 break;
996         case 32:
997                 dev->maxpacketsize = PACKET_SIZE_32;
998                 break;
999         case 64:
1000                 dev->maxpacketsize = PACKET_SIZE_64;
1001                 break;
1002         default:
1003                 printf("usb_new_device: invalid max packet size\n");
1004                 return -EIO;
1005         }
1006
1007         return 0;
1008 }
1009
1010 static int usb_prepare_device(struct usb_device *dev, int addr, bool do_read,
1011                               struct usb_device *parent, int portnr)
1012 {
1013         int err;
1014
1015         /*
1016          * Allocate usb 3.0 device context.
1017          * USB 3.0 (xHCI) protocol tries to allocate device slot
1018          * and related data structures first. This call does that.
1019          * Refer to sec 4.3.2 in xHCI spec rev1.0
1020          */
1021         err = usb_alloc_device(dev);
1022         if (err) {
1023                 printf("Cannot allocate device context to get SLOT_ID\n");
1024                 return err;
1025         }
1026         err = usb_setup_descriptor(dev, do_read);
1027         if (err)
1028                 return err;
1029         err = usb_legacy_port_reset(parent, portnr);
1030         if (err)
1031                 return err;
1032
1033         dev->devnum = addr;
1034
1035         err = usb_set_address(dev); /* set address */
1036
1037         if (err < 0) {
1038                 printf("\n      USB device not accepting new address " \
1039                         "(error=%lX)\n", dev->status);
1040                 return err;
1041         }
1042
1043         mdelay(10);     /* Let the SET_ADDRESS settle */
1044
1045         return 0;
1046 }
1047
1048 int usb_select_config(struct usb_device *dev)
1049 {
1050         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ);
1051         int err;
1052
1053         err = get_descriptor_len(dev, USB_DT_DEVICE_SIZE, USB_DT_DEVICE_SIZE);
1054         if (err)
1055                 return err;
1056
1057         /* correct le values */
1058         le16_to_cpus(&dev->descriptor.bcdUSB);
1059         le16_to_cpus(&dev->descriptor.idVendor);
1060         le16_to_cpus(&dev->descriptor.idProduct);
1061         le16_to_cpus(&dev->descriptor.bcdDevice);
1062
1063         /* only support for one config for now */
1064         err = usb_get_configuration_no(dev, tmpbuf, 0);
1065         if (err < 0) {
1066                 printf("usb_new_device: Cannot read configuration, " \
1067                        "skipping device %04x:%04x\n",
1068                        dev->descriptor.idVendor, dev->descriptor.idProduct);
1069                 return err;
1070         }
1071         usb_parse_config(dev, tmpbuf, 0);
1072         usb_set_maxpacket(dev);
1073         /*
1074          * we set the default configuration here
1075          * This seems premature. If the driver wants a different configuration
1076          * it will need to select itself.
1077          */
1078         err = usb_set_configuration(dev, dev->config.desc.bConfigurationValue);
1079         if (err < 0) {
1080                 printf("failed to set default configuration " \
1081                         "len %d, status %lX\n", dev->act_len, dev->status);
1082                 return err;
1083         }
1084         debug("new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
1085               dev->descriptor.iManufacturer, dev->descriptor.iProduct,
1086               dev->descriptor.iSerialNumber);
1087         memset(dev->mf, 0, sizeof(dev->mf));
1088         memset(dev->prod, 0, sizeof(dev->prod));
1089         memset(dev->serial, 0, sizeof(dev->serial));
1090         if (dev->descriptor.iManufacturer)
1091                 usb_string(dev, dev->descriptor.iManufacturer,
1092                            dev->mf, sizeof(dev->mf));
1093         if (dev->descriptor.iProduct)
1094                 usb_string(dev, dev->descriptor.iProduct,
1095                            dev->prod, sizeof(dev->prod));
1096         if (dev->descriptor.iSerialNumber)
1097                 usb_string(dev, dev->descriptor.iSerialNumber,
1098                            dev->serial, sizeof(dev->serial));
1099         debug("Manufacturer %s\n", dev->mf);
1100         debug("Product      %s\n", dev->prod);
1101         debug("SerialNumber %s\n", dev->serial);
1102
1103         return 0;
1104 }
1105
1106 int usb_setup_device(struct usb_device *dev, bool do_read,
1107                      struct usb_device *parent, int portnr)
1108 {
1109         int addr;
1110         int ret;
1111
1112         /* We still haven't set the Address yet */
1113         addr = dev->devnum;
1114         dev->devnum = 0;
1115
1116         ret = usb_prepare_device(dev, addr, do_read, parent, portnr);
1117         if (ret)
1118                 return ret;
1119         ret = usb_select_config(dev);
1120
1121         return ret;
1122 }
1123
1124 #ifndef CONFIG_DM_USB
1125 /*
1126  * By the time we get here, the device has gotten a new device ID
1127  * and is in the default state. We need to identify the thing and
1128  * get the ball rolling..
1129  *
1130  * Returns 0 for success, != 0 for error.
1131  */
1132 int usb_new_device(struct usb_device *dev)
1133 {
1134         bool do_read = true;
1135         int err;
1136
1137         /*
1138          * XHCI needs to issue a Address device command to setup
1139          * proper device context structures, before it can interact
1140          * with the device. So a get_descriptor will fail before any
1141          * of that is done for XHCI unlike EHCI.
1142          */
1143 #ifdef CONFIG_USB_XHCI
1144         do_read = false;
1145 #endif
1146         err = usb_setup_device(dev, do_read, dev->parent, dev->portnr);
1147         if (err)
1148                 return err;
1149
1150         /* Now probe if the device is a hub */
1151         err = usb_hub_probe(dev, 0);
1152         if (err < 0)
1153                 return err;
1154
1155         return 0;
1156 }
1157 #endif
1158
1159 __weak
1160 int board_usb_init(int index, enum usb_init_type init)
1161 {
1162         return 0;
1163 }
1164
1165 __weak
1166 int board_usb_cleanup(int index, enum usb_init_type init)
1167 {
1168         return 0;
1169 }
1170
1171 bool usb_device_has_child_on_port(struct usb_device *parent, int port)
1172 {
1173 #ifdef CONFIG_DM_USB
1174         return false;
1175 #else
1176         return parent->children[port] != NULL;
1177 #endif
1178 }
1179
1180 /* EOF */