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/slab.h> 23 #include <linux/list.h> 24 #include <linux/usb.h> 25 #include <linux/usb/hcd.h> 26 #include "fhci.h" 27 28 /* maps the hardware error code to the USB error code */ 29 static int status_to_error(u32 status) 30 { 31 if (status == USB_TD_OK) 32 return 0; 33 else if (status & USB_TD_RX_ER_CRC) 34 return -EILSEQ; 35 else if (status & USB_TD_RX_ER_NONOCT) 36 return -EPROTO; 37 else if (status & USB_TD_RX_ER_OVERUN) 38 return -ECOMM; 39 else if (status & USB_TD_RX_ER_BITSTUFF) 40 return -EPROTO; 41 else if (status & USB_TD_RX_ER_PID) 42 return -EILSEQ; 43 else if (status & (USB_TD_TX_ER_NAK | USB_TD_TX_ER_TIMEOUT)) 44 return -ETIMEDOUT; 45 else if (status & USB_TD_TX_ER_STALL) 46 return -EPIPE; 47 else if (status & USB_TD_TX_ER_UNDERUN) 48 return -ENOSR; 49 else if (status & USB_TD_RX_DATA_UNDERUN) 50 return -EREMOTEIO; 51 else if (status & USB_TD_RX_DATA_OVERUN) 52 return -EOVERFLOW; 53 else 54 return -EINVAL; 55 } 56 57 void fhci_add_td_to_frame(struct fhci_time_frame *frame, struct td *td) 58 { 59 list_add_tail(&td->frame_lh, &frame->tds_list); 60 } 61 62 void fhci_add_tds_to_ed(struct ed *ed, struct td **td_list, int number) 63 { 64 int i; 65 66 for (i = 0; i < number; i++) { 67 struct td *td = td_list[i]; 68 list_add_tail(&td->node, &ed->td_list); 69 } 70 if (ed->td_head == NULL) 71 ed->td_head = td_list[0]; 72 } 73 74 static struct td *peek_td_from_ed(struct ed *ed) 75 { 76 struct td *td; 77 78 if (!list_empty(&ed->td_list)) 79 td = list_entry(ed->td_list.next, struct td, node); 80 else 81 td = NULL; 82 83 return td; 84 } 85 86 struct td *fhci_remove_td_from_frame(struct fhci_time_frame *frame) 87 { 88 struct td *td; 89 90 if (!list_empty(&frame->tds_list)) { 91 td = list_entry(frame->tds_list.next, struct td, frame_lh); 92 list_del_init(frame->tds_list.next); 93 } else 94 td = NULL; 95 96 return td; 97 } 98 99 struct td *fhci_peek_td_from_frame(struct fhci_time_frame *frame) 100 { 101 struct td *td; 102 103 if (!list_empty(&frame->tds_list)) 104 td = list_entry(frame->tds_list.next, struct td, frame_lh); 105 else 106 td = NULL; 107 108 return td; 109 } 110 111 struct td *fhci_remove_td_from_ed(struct ed *ed) 112 { 113 struct td *td; 114 115 if (!list_empty(&ed->td_list)) { 116 td = list_entry(ed->td_list.next, struct td, node); 117 list_del_init(ed->td_list.next); 118 119 /* if this TD was the ED's head, find next TD */ 120 if (!list_empty(&ed->td_list)) 121 ed->td_head = list_entry(ed->td_list.next, struct td, 122 node); 123 else 124 ed->td_head = NULL; 125 } else 126 td = NULL; 127 128 return td; 129 } 130 131 struct td *fhci_remove_td_from_done_list(struct fhci_controller_list *p_list) 132 { 133 struct td *td; 134 135 if (!list_empty(&p_list->done_list)) { 136 td = list_entry(p_list->done_list.next, struct td, node); 137 list_del_init(p_list->done_list.next); 138 } else 139 td = NULL; 140 141 return td; 142 } 143 144 void fhci_move_td_from_ed_to_done_list(struct fhci_usb *usb, struct ed *ed) 145 { 146 struct td *td; 147 148 td = ed->td_head; 149 list_del_init(&td->node); 150 151 /* If this TD was the ED's head,find next TD */ 152 if (!list_empty(&ed->td_list)) 153 ed->td_head = list_entry(ed->td_list.next, struct td, node); 154 else { 155 ed->td_head = NULL; 156 ed->state = FHCI_ED_SKIP; 157 } 158 ed->toggle_carry = td->toggle; 159 list_add_tail(&td->node, &usb->hc_list->done_list); 160 if (td->ioc) 161 usb->transfer_confirm(usb->fhci); 162 } 163 164 /* free done FHCI URB resource such as ED and TD */ 165 static void free_urb_priv(struct fhci_hcd *fhci, struct urb *urb) 166 { 167 int i; 168 struct urb_priv *urb_priv = urb->hcpriv; 169 struct ed *ed = urb_priv->ed; 170 171 for (i = 0; i < urb_priv->num_of_tds; i++) { 172 list_del_init(&urb_priv->tds[i]->node); 173 fhci_recycle_empty_td(fhci, urb_priv->tds[i]); 174 } 175 176 /* if this TD was the ED's head,find the next TD */ 177 if (!list_empty(&ed->td_list)) 178 ed->td_head = list_entry(ed->td_list.next, struct td, node); 179 else 180 ed->td_head = NULL; 181 182 kfree(urb_priv->tds); 183 kfree(urb_priv); 184 urb->hcpriv = NULL; 185 186 /* if this TD was the ED's head,find next TD */ 187 if (ed->td_head == NULL) 188 list_del_init(&ed->node); 189 fhci->active_urbs--; 190 } 191 192 /* this routine called to complete and free done URB */ 193 void fhci_urb_complete_free(struct fhci_hcd *fhci, struct urb *urb) 194 { 195 free_urb_priv(fhci, urb); 196 197 if (urb->status == -EINPROGRESS) { 198 if (urb->actual_length != urb->transfer_buffer_length && 199 urb->transfer_flags & URB_SHORT_NOT_OK) 200 urb->status = -EREMOTEIO; 201 else 202 urb->status = 0; 203 } 204 205 usb_hcd_unlink_urb_from_ep(fhci_to_hcd(fhci), urb); 206 207 spin_unlock(&fhci->lock); 208 209 usb_hcd_giveback_urb(fhci_to_hcd(fhci), urb, urb->status); 210 211 spin_lock(&fhci->lock); 212 } 213 214 /* 215 * caculate transfer length/stats and update the urb 216 * Precondition: irqsafe(only for urb-?status locking) 217 */ 218 void fhci_done_td(struct urb *urb, struct td *td) 219 { 220 struct ed *ed = td->ed; 221 u32 cc = td->status; 222 223 /* ISO...drivers see per-TD length/status */ 224 if (ed->mode == FHCI_TF_ISO) { 225 u32 len; 226 if (!(urb->transfer_flags & URB_SHORT_NOT_OK && 227 cc == USB_TD_RX_DATA_UNDERUN)) 228 cc = USB_TD_OK; 229 230 if (usb_pipeout(urb->pipe)) 231 len = urb->iso_frame_desc[td->iso_index].length; 232 else 233 len = td->actual_len; 234 235 urb->actual_length += len; 236 urb->iso_frame_desc[td->iso_index].actual_length = len; 237 urb->iso_frame_desc[td->iso_index].status = 238 status_to_error(cc); 239 } 240 241 /* BULK,INT,CONTROL... drivers see aggregate length/status, 242 * except that "setup" bytes aren't counted and "short" transfers 243 * might not be reported as errors. 244 */ 245 else { 246 if (td->error_cnt >= 3) 247 urb->error_count = 3; 248 249 /* control endpoint only have soft stalls */ 250 251 /* update packet status if needed(short may be ok) */ 252 if (!(urb->transfer_flags & URB_SHORT_NOT_OK) && 253 cc == USB_TD_RX_DATA_UNDERUN) { 254 ed->state = FHCI_ED_OPER; 255 cc = USB_TD_OK; 256 } 257 if (cc != USB_TD_OK) { 258 if (urb->status == -EINPROGRESS) 259 urb->status = status_to_error(cc); 260 } 261 262 /* count all non-empty packets except control SETUP packet */ 263 if (td->type != FHCI_TA_SETUP || td->iso_index != 0) 264 urb->actual_length += td->actual_len; 265 } 266 } 267 268 /* there are some pedning request to unlink */ 269 void fhci_del_ed_list(struct fhci_hcd *fhci, struct ed *ed) 270 { 271 struct td *td = peek_td_from_ed(ed); 272 struct urb *urb = td->urb; 273 struct urb_priv *urb_priv = urb->hcpriv; 274 275 if (urb_priv->state == URB_DEL) { 276 td = fhci_remove_td_from_ed(ed); 277 /* HC may have partly processed this TD */ 278 if (td->status != USB_TD_INPROGRESS) 279 fhci_done_td(urb, td); 280 281 /* URB is done;clean up */ 282 if (++(urb_priv->tds_cnt) == urb_priv->num_of_tds) 283 fhci_urb_complete_free(fhci, urb); 284 } 285 } 286