/* * Freescale QUICC Engine USB Host Controller Driver * * Copyright (c) Freescale Semicondutor, Inc. 2006. * Shlomi Gridish * Jerry Huang * Copyright (c) Logic Product Development, Inc. 2007 * Peter Barada * Copyright (c) MontaVista Software, Inc. 2008. * Anton Vorontsov * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include #include #include #include #include #include #include #include #include "fhci.h" /* maps the hardware error code to the USB error code */ static int status_to_error(u32 status) { if (status == USB_TD_OK) return 0; else if (status & USB_TD_RX_ER_CRC) return -EILSEQ; else if (status & USB_TD_RX_ER_NONOCT) return -EPROTO; else if (status & USB_TD_RX_ER_OVERUN) return -ECOMM; else if (status & USB_TD_RX_ER_BITSTUFF) return -EPROTO; else if (status & USB_TD_RX_ER_PID) return -EILSEQ; else if (status & (USB_TD_TX_ER_NAK | USB_TD_TX_ER_TIMEOUT)) return -ETIMEDOUT; else if (status & USB_TD_TX_ER_STALL) return -EPIPE; else if (status & USB_TD_TX_ER_UNDERUN) return -ENOSR; else if (status & USB_TD_RX_DATA_UNDERUN) return -EREMOTEIO; else if (status & USB_TD_RX_DATA_OVERUN) return -EOVERFLOW; else return -EINVAL; } void fhci_add_td_to_frame(struct fhci_time_frame *frame, struct td *td) { list_add_tail(&td->frame_lh, &frame->tds_list); } void fhci_add_tds_to_ed(struct ed *ed, struct td **td_list, int number) { int i; for (i = 0; i < number; i++) { struct td *td = td_list[i]; list_add_tail(&td->node, &ed->td_list); } if (ed->td_head == NULL) ed->td_head = td_list[0]; } static struct td *peek_td_from_ed(struct ed *ed) { struct td *td; if (!list_empty(&ed->td_list)) td = list_entry(ed->td_list.next, struct td, node); else td = NULL; return td; } struct td *fhci_remove_td_from_frame(struct fhci_time_frame *frame) { struct td *td; if (!list_empty(&frame->tds_list)) { td = list_entry(frame->tds_list.next, struct td, frame_lh); list_del_init(frame->tds_list.next); } else td = NULL; return td; } struct td *fhci_peek_td_from_frame(struct fhci_time_frame *frame) { struct td *td; if (!list_empty(&frame->tds_list)) td = list_entry(frame->tds_list.next, struct td, frame_lh); else td = NULL; return td; } struct td *fhci_remove_td_from_ed(struct ed *ed) { struct td *td; if (!list_empty(&ed->td_list)) { td = list_entry(ed->td_list.next, struct td, node); list_del_init(ed->td_list.next); /* if this TD was the ED's head, find next TD */ if (!list_empty(&ed->td_list)) ed->td_head = list_entry(ed->td_list.next, struct td, node); else ed->td_head = NULL; } else td = NULL; return td; } struct td *fhci_remove_td_from_done_list(struct fhci_controller_list *p_list) { struct td *td; if (!list_empty(&p_list->done_list)) { td = list_entry(p_list->done_list.next, struct td, node); list_del_init(p_list->done_list.next); } else td = NULL; return td; } void fhci_move_td_from_ed_to_done_list(struct fhci_usb *usb, struct ed *ed) { struct td *td; td = ed->td_head; list_del_init(&td->node); /* If this TD was the ED's head,find next TD */ if (!list_empty(&ed->td_list)) ed->td_head = list_entry(ed->td_list.next, struct td, node); else { ed->td_head = NULL; ed->state = FHCI_ED_SKIP; } ed->toggle_carry = td->toggle; list_add_tail(&td->node, &usb->hc_list->done_list); if (td->ioc) usb->transfer_confirm(usb->fhci); } /* free done FHCI URB resource such as ED and TD */ static void free_urb_priv(struct fhci_hcd *fhci, struct urb *urb) { int i; struct urb_priv *urb_priv = urb->hcpriv; struct ed *ed = urb_priv->ed; for (i = 0; i < urb_priv->num_of_tds; i++) { list_del_init(&urb_priv->tds[i]->node); fhci_recycle_empty_td(fhci, urb_priv->tds[i]); } /* if this TD was the ED's head,find the next TD */ if (!list_empty(&ed->td_list)) ed->td_head = list_entry(ed->td_list.next, struct td, node); else ed->td_head = NULL; kfree(urb_priv->tds); kfree(urb_priv); urb->hcpriv = NULL; /* if this TD was the ED's head,find next TD */ if (ed->td_head == NULL) list_del_init(&ed->node); fhci->active_urbs--; } /* this routine called to complete and free done URB */ void fhci_urb_complete_free(struct fhci_hcd *fhci, struct urb *urb) { free_urb_priv(fhci, urb); if (urb->status == -EINPROGRESS) { if (urb->actual_length != urb->transfer_buffer_length && urb->transfer_flags & URB_SHORT_NOT_OK) urb->status = -EREMOTEIO; else urb->status = 0; } usb_hcd_unlink_urb_from_ep(fhci_to_hcd(fhci), urb); spin_unlock(&fhci->lock); usb_hcd_giveback_urb(fhci_to_hcd(fhci), urb, urb->status); spin_lock(&fhci->lock); } /* * caculate transfer length/stats and update the urb * Precondition: irqsafe(only for urb-?status locking) */ void fhci_done_td(struct urb *urb, struct td *td) { struct ed *ed = td->ed; u32 cc = td->status; /* ISO...drivers see per-TD length/status */ if (ed->mode == FHCI_TF_ISO) { u32 len; if (!(urb->transfer_flags & URB_SHORT_NOT_OK && cc == USB_TD_RX_DATA_UNDERUN)) cc = USB_TD_OK; if (usb_pipeout(urb->pipe)) len = urb->iso_frame_desc[td->iso_index].length; else len = td->actual_len; urb->actual_length += len; urb->iso_frame_desc[td->iso_index].actual_length = len; urb->iso_frame_desc[td->iso_index].status = status_to_error(cc); } /* BULK,INT,CONTROL... drivers see aggregate length/status, * except that "setup" bytes aren't counted and "short" transfers * might not be reported as errors. */ else { if (td->error_cnt >= 3) urb->error_count = 3; /* control endpoint only have soft stalls */ /* update packet status if needed(short may be ok) */ if (!(urb->transfer_flags & URB_SHORT_NOT_OK) && cc == USB_TD_RX_DATA_UNDERUN) { ed->state = FHCI_ED_OPER; cc = USB_TD_OK; } if (cc != USB_TD_OK) { if (urb->status == -EINPROGRESS) urb->status = status_to_error(cc); } /* count all non-empty packets except control SETUP packet */ if (td->type != FHCI_TA_SETUP || td->iso_index != 0) urb->actual_length += td->actual_len; } } /* there are some pedning request to unlink */ void fhci_del_ed_list(struct fhci_hcd *fhci, struct ed *ed) { struct td *td = peek_td_from_ed(ed); struct urb *urb = td->urb; struct urb_priv *urb_priv = urb->hcpriv; if (urb_priv->state == URB_DEL) { td = fhci_remove_td_from_ed(ed); /* HC may have partly processed this TD */ if (td->status != USB_TD_INPROGRESS) fhci_done_td(urb, td); /* URB is done;clean up */ if (++(urb_priv->tds_cnt) == urb_priv->num_of_tds) fhci_urb_complete_free(fhci, urb); } } re no longer used in future tasks. SIGKILL is used to ensure that the process does not try to coredump and result in an attempt to read the memory again from within kernel space. Although there is a HV call to scrub the memory (mem_scrub), there is no easy way to guarantee that the real memory address(es) are not used by other tasks. Clearing the error with mem_scrub would zero the memory and cause the other processes to proceed with bad data. The handling of other non-resumable errors remain unchanged and will cause a panic. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/usb/musb/musb_io.h')