drivers/usb/host/fhci-q.c

   1 /*
   2  * Freescale QUICC Engine USB Host Controller Driver
   3  *
   4  * Copyright (c) Freescale Semicondutor, Inc. 2006.
   5  *               Shlomi Gridish <gridish@freescale.com>
   6  *               Jerry Huang <Chang-Ming.Huang@freescale.com>
   7  * Copyright (c) Logic Product Development, Inc. 2007
   8  *               Peter Barada <peterb@logicpd.com>
   9  * Copyright (c) MontaVista Software, Inc. 2008.
  10  *               Anton Vorontsov <avorontsov@ru.mvista.com>
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/types.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/errno.h>
  22 #include <linux/list.h>
  23 #include <linux/usb.h>
  24 #include "../core/hcd.h"
  25 #include "fhci.h"
  26
  27 /* maps the hardware error code to the USB error code */
  28 static int status_to_error(u32 status)
  29 {
  30         if (status == USB_TD_OK)
  31                 return 0;
  32         else if (status & USB_TD_RX_ER_CRC)
  33                 return -EILSEQ;
  34         else if (status & USB_TD_RX_ER_NONOCT)
  35                 return -EPROTO;
  36         else if (status & USB_TD_RX_ER_OVERUN)
  37                 return -ECOMM;
  38         else if (status & USB_TD_RX_ER_BITSTUFF)
  39                 return -EPROTO;
  40         else if (status & USB_TD_RX_ER_PID)
  41                 return -EILSEQ;
  42         else if (status & (USB_TD_TX_ER_NAK | USB_TD_TX_ER_TIMEOUT))
  43                 return -ETIMEDOUT;
  44         else if (status & USB_TD_TX_ER_STALL)
  45                 return -EPIPE;
  46         else if (status & USB_TD_TX_ER_UNDERUN)
  47                 return -ENOSR;
  48         else if (status & USB_TD_RX_DATA_UNDERUN)
  49                 return -EREMOTEIO;
  50         else if (status & USB_TD_RX_DATA_OVERUN)
  51                 return -EOVERFLOW;
  52         else
  53                 return -EINVAL;
  54 }
  55
  56 void fhci_add_td_to_frame(struct fhci_time_frame *frame, struct td *td)
  57 {
  58         list_add_tail(&td->frame_lh, &frame->tds_list);
  59 }
  60
  61 void fhci_add_tds_to_ed(struct ed *ed, struct td **td_list, int number)
  62 {
  63         int i;
  64
  65         for (i = 0; i < number; i++) {
  66                 struct td *td = td_list[i];
  67                 list_add_tail(&td->node, &ed->td_list);
  68         }
  69         if (ed->td_head == NULL)
  70                 ed->td_head = td_list[0];
  71 }
  72
  73 static struct td *peek_td_from_ed(struct ed *ed)
  74 {
  75         struct td *td;
  76
  77         if (!list_empty(&ed->td_list))
  78                 td = list_entry(ed->td_list.next, struct td, node);
  79         else
  80                 td = NULL;
  81
  82         return td;
  83 }
  84
  85 struct td *fhci_remove_td_from_frame(struct fhci_time_frame *frame)
  86 {
  87         struct td *td;
  88
  89         if (!list_empty(&frame->tds_list)) {
  90                 td = list_entry(frame->tds_list.next, struct td, frame_lh);
  91                 list_del_init(frame->tds_list.next);
  92         } else
  93                 td = NULL;
  94
  95         return td;
  96 }
  97
  98 struct td *fhci_peek_td_from_frame(struct fhci_time_frame *frame)
  99 {
 100         struct td *td;
 101
 102         if (!list_empty(&frame->tds_list))
 103                 td = list_entry(frame->tds_list.next, struct td, frame_lh);
 104         else
 105                 td = NULL;
 106
 107         return td;
 108 }
 109
 110 struct td *fhci_remove_td_from_ed(struct ed *ed)
 111 {
 112         struct td *td;
 113
 114         if (!list_empty(&ed->td_list)) {
 115                 td = list_entry(ed->td_list.next, struct td, node);
 116                 list_del_init(ed->td_list.next);
 117
 118                 /* if this TD was the ED's head, find next TD */
 119                 if (!list_empty(&ed->td_list))
 120                         ed->td_head = list_entry(ed->td_list.next, struct td,
 121                                                  node);
 122                 else
 123                         ed->td_head = NULL;
 124         } else
 125                 td = NULL;
 126
 127         return td;
 128 }
 129
 130 struct td *fhci_remove_td_from_done_list(struct fhci_controller_list *p_list)
 131 {
 132         struct td *td;
 133
 134         if (!list_empty(&p_list->done_list)) {
 135                 td = list_entry(p_list->done_list.next, struct td, node);
 136                 list_del_init(p_list->done_list.next);
 137         } else
 138                 td = NULL;
 139
 140         return td;
 141 }
 142
 143 void fhci_move_td_from_ed_to_done_list(struct fhci_usb *usb, struct ed *ed)
 144 {
 145         struct td *td;
 146
 147         td = ed->td_head;
 148         list_del_init(&td->node);
 149
 150         /* If this TD was the ED's head,find next TD */
 151         if (!list_empty(&ed->td_list))
 152                 ed->td_head = list_entry(ed->td_list.next, struct td, node);
 153         else {
 154                 ed->td_head = NULL;
 155                 ed->state = FHCI_ED_SKIP;
 156         }
 157         ed->toggle_carry = td->toggle;
 158         list_add_tail(&td->node, &usb->hc_list->done_list);
 159         if (td->ioc)
 160                 usb->transfer_confirm(usb->fhci);
 161 }
 162
 163 /* free done FHCI URB resource such as ED and TD */
 164 static void free_urb_priv(struct fhci_hcd *fhci, struct urb *urb)
 165 {
 166         int i;
 167         struct urb_priv *urb_priv = urb->hcpriv;
 168         struct ed *ed = urb_priv->ed;
 169
 170         for (i = 0; i < urb_priv->num_of_tds; i++) {
 171                 list_del_init(&urb_priv->tds[i]->node);
 172                 fhci_recycle_empty_td(fhci, urb_priv->tds[i]);
 173         }
 174
 175         /* if this TD was the ED's head,find the next TD */
 176         if (!list_empty(&ed->td_list))
 177                 ed->td_head = list_entry(ed->td_list.next, struct td, node);
 178         else
 179                 ed->td_head = NULL;
 180
 181         kfree(urb_priv->tds);
 182         kfree(urb_priv);
 183         urb->hcpriv = NULL;
 184
 185         /* if this TD was the ED's head,find next TD */
 186         if (ed->td_head == NULL)
 187                 list_del_init(&ed->node);
 188         fhci->active_urbs--;
 189 }
 190
 191 /* this routine called to complete and free done URB */
 192 void fhci_urb_complete_free(struct fhci_hcd *fhci, struct urb *urb)
 193 {
 194         free_urb_priv(fhci, urb);
 195
 196         if (urb->status == -EINPROGRESS) {
 197                 if (urb->actual_length != urb->transfer_buffer_length &&
 198                                 urb->transfer_flags & URB_SHORT_NOT_OK)
 199                         urb->status = -EREMOTEIO;
 200                 else
 201                         urb->status = 0;
 202         }
 203
 204         usb_hcd_unlink_urb_from_ep(fhci_to_hcd(fhci), urb);
 205
 206         spin_unlock(&fhci->lock);
 207
 208         usb_hcd_giveback_urb(fhci_to_hcd(fhci), urb, urb->status);
 209
 210         spin_lock(&fhci->lock);
 211 }
 212
 213 /*
 214  * caculate transfer length/stats and update the urb
 215  * Precondition: irqsafe(only for urb-?status locking)
 216  */
 217 void fhci_done_td(struct urb *urb, struct td *td)
 218 {
 219         struct ed *ed = td->ed;
 220         u32 cc = td->status;
 221
 222         /* ISO...drivers see per-TD length/status */
 223         if (ed->mode == FHCI_TF_ISO) {
 224                 u32 len;
 225                 if (!(urb->transfer_flags & URB_SHORT_NOT_OK &&
 226                                 cc == USB_TD_RX_DATA_UNDERUN))
 227                         cc = USB_TD_OK;
 228
 229                 if (usb_pipeout(urb->pipe))
 230                         len = urb->iso_frame_desc[td->iso_index].length;
 231                 else
 232                         len = td->actual_len;
 233
 234                 urb->actual_length += len;
 235                 urb->iso_frame_desc[td->iso_index].actual_length = len;
 236                 urb->iso_frame_desc[td->iso_index].status =
 237                         status_to_error(cc);
 238         }
 239
 240         /* BULK,INT,CONTROL... drivers see aggregate length/status,
 241          * except that "setup" bytes aren't counted and "short" transfers
 242          * might not be reported as errors.
 243          */
 244         else {
 245                 if (td->error_cnt >= 3)
 246                         urb->error_count = 3;
 247
 248                 /* control endpoint only have soft stalls */
 249
 250                 /* update packet status if needed(short may be ok) */
 251                 if (!(urb->transfer_flags & URB_SHORT_NOT_OK) &&
 252                                 cc == USB_TD_RX_DATA_UNDERUN) {
 253                         ed->state = FHCI_ED_OPER;
 254                         cc = USB_TD_OK;
 255                 }
 256                 if (cc != USB_TD_OK) {
 257                         if (urb->status == -EINPROGRESS)
 258                                 urb->status = status_to_error(cc);
 259                 }
 260
 261                 /* count all non-empty packets except control SETUP packet */
 262                 if (td->type != FHCI_TA_SETUP || td->iso_index != 0)
 263                         urb->actual_length += td->actual_len;
 264         }
 265 }
 266
 267 /* there are some pedning request to unlink */
 268 void fhci_del_ed_list(struct fhci_hcd *fhci, struct ed *ed)
 269 {
 270         struct td *td = peek_td_from_ed(ed);
 271         struct urb *urb = td->urb;
 272         struct urb_priv *urb_priv = urb->hcpriv;
 273
 274         if (urb_priv->state == URB_DEL) {
 275                 td = fhci_remove_td_from_ed(ed);
 276                 /* HC may have partly processed this TD */
 277                 if (td->status != USB_TD_INPROGRESS)
 278                         fhci_done_td(urb, td);
 279
 280                 /* URB is done;clean up */
 281                 if (++(urb_priv->tds_cnt) == urb_priv->num_of_tds)
 282                         fhci_urb_complete_free(fhci, urb);
 283         }
 284 }