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