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/****************************************************************************
* (C) Copyright 2008 Samsung Electronics Co., Ltd., All rights reserved
*
* [File Name] : TransferReadyQ.c
* [Description] : The source file implements the internal
* functions of TransferReadyQ.
* [Author] : Yang Soon Yeal { syatom.yang@samsung.com }
* [Department] : System LSI Division/System SW Lab
* [Created Date]: 2008/06/04
* [Revision History]
* (1) 2008/06/04 by Yang Soon Yeal { syatom.yang@samsung.com }
* - Created this file and implements functions of TransferReadyQ.
* -# Jul 15,2008 v1.2 by SeungSoo Yang (ss1.yang@samsung.com) \n
* : Optimizing for performance \n
*
****************************************************************************/
/****************************************************************************
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
****************************************************************************/
static struct trans_ready_q periodic_trans_ready_q;
static struct trans_ready_q nonperiodic_trans_ready_q;
/******************************************************************************/
/*!
* @name void init_transfer_ready_q(void)
*
* @brief this function initiates PeriodicTransferReadyQ
* and NonPeriodicTransferReadyQ.
*
*
* @param void
*
* @return void.
*/
/******************************************************************************/
static void init_transfer_ready_q(void)
{
otg_dbg(OTG_DBG_SCHEDULE, "start init_transfer_ready_q\n");
otg_list_init(&periodic_trans_ready_q.entity_list);
periodic_trans_ready_q.is_periodic = true;
periodic_trans_ready_q.entity_num = 0;
periodic_trans_ready_q.total_alloc_chnum = 0;
periodic_trans_ready_q.total_perio_bus_bandwidth = 0;
otg_list_init(&nonperiodic_trans_ready_q.entity_list);
nonperiodic_trans_ready_q.is_periodic = false;
nonperiodic_trans_ready_q.entity_num = 0;
nonperiodic_trans_ready_q.total_alloc_chnum = 0;
nonperiodic_trans_ready_q.total_perio_bus_bandwidth = 0;
}
/******************************************************************************/
/*!
* @name int insert_ed_to_ready_q(struct ed *insert_ed,
* bool is_first)
*
* @brief this function inserts ed_t * to TransferReadyQ.
*
*
* @param [IN] insert_ed
* = indicates the ed_t to be inserted to TransferReadyQ.
* [IN] is_first
* = indicates whether the insert_ed is inserted
* as first entry of TransferReadyQ.
*
* @return
* USB_ERR_SUCCESS -if successes to insert the insert_ed to TransferReadyQ.
* USB_ERR_FAILl -if fails to insert the insert_ed to TransferReadyQ.
*/
/******************************************************************************/
static int insert_ed_to_ready_q(struct ed *insert_ed, bool is_first)
{
otg_dbg(OTG_DBG_SCHEDULE_ED, "ed_id %d, td_id %d, %d\n",
insert_ed->ed_id, insert_ed->num_td, is_first);
if (insert_ed->ed_desc.endpoint_type == BULK_TRANSFER ||
insert_ed->ed_desc.endpoint_type == CONTROL_TRANSFER) {
if (is_first) {
otg_list_push_next(&insert_ed->readyq_list,
&nonperiodic_trans_ready_q.entity_list);
} else {
otg_list_push_prev(&insert_ed->readyq_list,
&nonperiodic_trans_ready_q.entity_list);
}
nonperiodic_trans_ready_q.entity_num++;
} else {
if (is_first) {
otg_list_push_next(&insert_ed->readyq_list,
&periodic_trans_ready_q.entity_list);
} else {
otg_list_push_prev(&insert_ed->readyq_list,
&periodic_trans_ready_q.entity_list);
}
periodic_trans_ready_q.entity_num++;
}
return USB_ERR_SUCCESS;
}
static u32 get_periodic_ready_q_entity_num(void)
{
return periodic_trans_ready_q.entity_num;
}
/******************************************************************************/
/*!
* @name int remove_ed_from_ready_q(ed_t *remove_ed)
*
* @brief this function removes ed_t * from TransferReadyQ.
*
*
* @param [IN] remove_ed
* = indicate the ed_t to be removed from TransferReadyQ.
*
* @return
* USB_ERR_SUCCESS -if successes to remove the remove_ed from TransferReadyQ.
* USB_ERR_FAILl -if fails to remove the remove_ed from TransferReadyQ.
*/
/******************************************************************************/
static int remove_ed_from_ready_q(struct ed *remove_ed)
{
otg_dbg(OTG_DBG_SCHEDULE_ED, "ed_id %d, td_id %d\n",
remove_ed->ed_id, remove_ed->num_td);
otg_list_pop(&remove_ed->readyq_list);
if (remove_ed->ed_desc.endpoint_type == BULK_TRANSFER ||
remove_ed->ed_desc.endpoint_type == CONTROL_TRANSFER) {
nonperiodic_trans_ready_q.entity_num--;
} else
periodic_trans_ready_q.entity_num--;
return USB_ERR_SUCCESS;
}
/******************************************************************************/
/*!
* @name int get_ed_from_ready_q(bool is_periodic,
* struct td **get_ed)
*
* @brief this function returns the first entity of TransferReadyQ.
* if there are some ed_t on TransferReadyQ,
* this function pops first ed_t from TransferReadyQ.
* So, the TransferReadyQ don's has the poped ed_t.
*
* @param [IN] is_periodic
* = indicate whether Periodic or not
* [OUT] get_ed
* = indicate the double pointer to store the address of first entity
* on TransferReadyQ.
*
* @return
* USB_ERR_SUCCESS -if successes to get frist ed_t from TransferReadyQ.
* USB_ERR_NO_ENTITY -if fails to get frist ed_t from TransferReadyQ
* because there is no entity on TransferReadyQ.
*/
/******************************************************************************/
static int get_ed_from_ready_q(struct ed **get_ed, bool is_periodic)
{
otg_list_head *qlist = NULL;
/* periodic transfer : control and bulk */
if (is_periodic) {
if (periodic_trans_ready_q.entity_num == 0)
return USB_ERR_NO_ENTITY;
qlist = periodic_trans_ready_q.entity_list.next;
if (!otg_list_empty(&periodic_trans_ready_q.entity_list)) {
*get_ed = otg_list_get_node(qlist,
struct ed, readyq_list);
if (qlist->prev == LIST_POISON2 ||
qlist->next == LIST_POISON1) {
printk(KERN_ERR "shost scheduler: get_ed_from_ready_q error\n");
periodic_trans_ready_q.entity_num = 0;
} else {
otg_list_pop(qlist);
periodic_trans_ready_q.entity_num--;
}
return USB_ERR_SUCCESS;
} else
return USB_ERR_NO_ENTITY;
/* non-periodic transfer : interrupt and ischo */
} else {
if (nonperiodic_trans_ready_q.entity_num == 0)
return USB_ERR_NO_ENTITY;
qlist = nonperiodic_trans_ready_q.entity_list.next;
if (!otg_list_empty(&nonperiodic_trans_ready_q.entity_list)) {
*get_ed = otg_list_get_node(qlist,
struct ed, readyq_list);
if (qlist->prev == LIST_POISON2 ||
qlist->next == LIST_POISON1) {
printk(KERN_ERR "s3c-otg-scheduler get_ed_from_ready_q error\n");
nonperiodic_trans_ready_q.entity_num = 0;
} else {
otg_list_pop(qlist);
nonperiodic_trans_ready_q.entity_num--;
}
return USB_ERR_SUCCESS;
} else
return USB_ERR_NO_ENTITY;
}
}
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