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/****************************************************************************
* (C) Copyright 2008 Samsung Electronics Co., Ltd., All rights reserved
*
* [File Name] : Scheduler.c
* [Description] : The source file implements the internal
* functions of Scheduler.
* [Author] : Yang Soon Yeal { syatom.yang@samsung.com }
* [Department] : System LSI Division/System SW Lab
* [Created Date]: 2009/2/10
* [Revision History]
* (1) 2008/06/03 by Yang Soon Yeal { syatom.yang@samsung.com }
* - Created this file and implements functions of Scheduler
* -# 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
****************************************************************************/
#include "shost.h"
#include "shost_readyq.c"
#include "shost_schedulerlib.c"
void init_scheduler(void)
{
/*init_scheduling();*/
init_transfer_ready_q();
}
/******************************************************************************/
/*!
* @name int reserve_used_resource_for_periodic(u32 usb_time)
*
* @brief this function reserves the necessary resource of USB Transfer
* for Periodic Transfer.
* So, this function firstly checks there ares some available USB Time
* and Channel resource for USB Transfer.
* if there exists necessary resources for Periodic Transfer,
* then reserves the resource.
*
* @param [IN] usb_time
* - indicates the USB Time for the USB Transfer.
*
* @return USB_ERR_SUCCESS - if success to insert pInsertED to S3CScheduler.
* USB_ERR_NO_BANDWIDTH - if fail to reserve the USB Bandwidth.
* USB_ERR_NO_CHANNEL - if fail to reserve the Channel.
*/
/******************************************************************************/
int reserve_used_resource_for_periodic(u32 usb_time,
u8 dev_speed, u8 trans_type)
{
if (inc_perio_bus_time(usb_time, dev_speed) == USB_ERR_SUCCESS) {
if (inc_perio_chnum() == USB_ERR_SUCCESS) {
otg_usbcore_inc_usb_bandwidth(usb_time);
otg_usbcore_inc_periodic_transfer_cnt(trans_type);
return USB_ERR_SUCCESS;
} else {
dec_perio_bus_time(usb_time);
return USB_ERR_NO_CHANNEL;
}
} else
return USB_ERR_NO_BANDWIDTH;
}
/******************************************************************************/
/*!
* @name int free_usb_resource_for_periodic(ed_t *pFreeED)
*
* @brief this function frees the resources to be allocated
* to pFreeED at S3CScheduler.
* that is, this functions only releases the resources
* to be allocated by S3C6400Scheduler.
*
* @param [IN] pFreeED
* - indicates ed_t to have the information of the resource to be released.
*
* @return USB_ERR_SUCCESS - if success to free the USB Resource.
* USB_ERR_FAIL - if fail to free the USB Resrouce.
*/
/******************************************************************************/
int free_usb_resource_for_periodic(
u32 free_usb_time, u8 free_chnum, u8 trans_type)
{
if (dec_perio_bus_time(free_usb_time) == USB_ERR_SUCCESS) {
if (dec_perio_chnum() == USB_ERR_SUCCESS) {
if (free_chnum != CH_NONE) {
oci_channel_dealloc(free_chnum);
set_transferring_td_array(free_chnum, 0);
}
otg_usbcore_des_usb_bandwidth(free_usb_time);
otg_usbcore_des_periodic_transfer_cnt(trans_type);
return USB_ERR_SUCCESS;
}
}
return USB_ERR_FAIL;
}
/******************************************************************************/
/*!
* @name int remove_ed_from_scheduler(ed_t *remove_ed)
*
* @brief this function just remove the remove_ed from TransferReadyQ.
* So if you want to stop the USB Tranfer of remove_ed
* or release the releated resources.
* you should call another functions of S3CScheduler.
*
* @param [IN] remove_ed
* - indicates ed_t to be removed from TransferReadyQ.
*
* @return
* USB_ERR_SUCCESS -if success to remove the remove_ed from TransferReadyQ.
* USB_ERR_FAIL -if fail to remove the remove_ed from TransferReadyQ.
*/
/******************************************************************************/
int remove_ed_from_scheduler(struct ed *remove_ed)
{
if (remove_ed->ed_status.is_in_transfer_ready_q) {
remove_ed_from_ready_q(remove_ed);
remove_ed->ed_status.is_in_transfer_ready_q = false;
return USB_ERR_SUCCESS;
} else
return USB_ERR_FAIL;
}
/******************************************************************************/
/*!
* @name int cancel_to_transfer_td(struct sec_otghost *otghost,
* struct td *cancel_td)
*
* @brief this function stop to execute the USB Transfer of cancel_td and
* release the Channel Resources to be allocated the cancel_td ,
* if the Transfer Type of cancel_td is NonPeriodic Transfer.
* this function don't release any usb resources(Channel, USB Bandwidth)
* for Periodic Transfer.
* if you want to release some usb resources for a periodic Transfer,
* you should call the free_usb_resource_for_periodic()
*
* @param [IN] cancel_td = indicates the struct td to be canceled.
*
* @return
* USB_ERR_SUCCESS-if success to cancel the USB Transfer of cancel_td.
* USB_ERR_FAIL -if fail to cancel the USB Transfer of cancel_td.
*/
/******************************************************************************/
int cancel_to_transfer_td(struct sec_otghost *otghost, struct td *cancel_td)
{
if (cancel_td->is_transfer_done)
return USB_ERR_FAIL;
if (cancel_td->is_transferring) {
int err;
err = oci_stop_transfer(otghost, cancel_td->cur_stransfer.
alloc_chnum);
if (err == USB_ERR_SUCCESS) {
set_transferring_td_array(cancel_td->cur_stransfer.
alloc_chnum, 0);
cancel_td->cur_stransfer.alloc_chnum = CH_NONE;
cancel_td->is_transferring = false;
cancel_td->parent_ed_p->ed_status.is_in_transferring =
false;
cancel_td->parent_ed_p->ed_status.in_transferring_td =
0;
cancel_td->parent_ed_p->is_need_to_insert_scheduler =
true;
if (cancel_td->cur_stransfer.ed_desc_p->
endpoint_type == BULK_TRANSFER ||
cancel_td->cur_stransfer.ed_desc_p->
endpoint_type == CONTROL_TRANSFER) {
dec_nonperio_chnum();
}
return err;
} else
return err;
} else
return USB_ERR_FAIL;
return USB_ERR_SUCCESS;
}
/******************************************************************************/
/*!
* @name int retransmit(struct sec_otghost *otghost, struct td *retrasmit_td)
*
* @brief this function retransmits the retrasmit_td immediately.
* So, the Channel of pRetransmitted is reused for retransmittion.
*
* @param [IN] retrasmit_td
* - indicates the pointer ot the struct td to be retransmitted.
*
* @return USB_ERR_SUCCESS - if success to retransmit the retrasmit_td.
* USB_ERR_FAIL - if fail to retransmit the retrasmit_td.
*/
/******************************************************************************/
int retransmit(struct sec_otghost *otghost, struct td *retrasmit_td)
{
u32 td_addr = 0;
if (get_transferring_td_array(retrasmit_td->cur_stransfer.
alloc_chnum, &td_addr) == USB_ERR_SUCCESS) {
if (td_addr == (u32)retrasmit_td) {
if (oci_start_transfer(otghost,
&retrasmit_td->cur_stransfer) ==
retrasmit_td->cur_stransfer.alloc_chnum) {
retrasmit_td->is_transferring = true;
retrasmit_td->parent_ed_p->ed_status.
in_transferring_td = (u32)retrasmit_td;
retrasmit_td->parent_ed_p->ed_status.
is_in_transfer_ready_q = false;
retrasmit_td->parent_ed_p->ed_status.
is_in_transferring = true;
}
} else
return USB_ERR_FAIL;
} else
return USB_ERR_FAIL;
return USB_ERR_SUCCESS;
}
/******************************************************************************/
/*!
* @name int reschedule(struct td *reschedule_td)
*
* @brief this function re-schedules the reschedule_td.
* So, the Channel of pRescheuleTD is released
* and reschedule_td is inserted to TransferReadyQ.
*
* @param [IN] reschedule_td
* - indicates the pointer ot the struct td to be rescheduled.
*
* @return USB_ERR_SUCCESS -if success to re-schedule the reschedule_td.
* USB_ERR_FAIL -if fail to re-schedule the reschedule_td.
*/
/******************************************************************************/
int reschedule(struct td *reschedule_td)
{
u32 td_addr;
if (get_transferring_td_array(reschedule_td->cur_stransfer.
alloc_chnum, &td_addr) == USB_ERR_SUCCESS) {
if ((u32)reschedule_td == td_addr) {
set_transferring_td_array(reschedule_td->cur_stransfer.
alloc_chnum, 0);
oci_channel_dealloc(reschedule_td->cur_stransfer.
alloc_chnum);
reschedule_td->cur_stransfer.alloc_chnum = CH_NONE;
reschedule_td->parent_ed_p->
is_need_to_insert_scheduler = true;
reschedule_td->parent_ed_p->ed_status.
in_transferring_td = 0;
if (reschedule_td->parent_ed_p->ed_desc.
endpoint_type == BULK_TRANSFER ||
reschedule_td->parent_ed_p->ed_desc.
endpoint_type == CONTROL_TRANSFER) {
/* Increase the available Channel */
dec_nonperio_chnum();
}
insert_ed_to_ready_q(reschedule_td->parent_ed_p, false);
reschedule_td->parent_ed_p->ed_status.
is_in_transfer_ready_q = true;
}
/* this case is not support....
else {
}
*/
}
return USB_ERR_SUCCESS;
}
/******************************************************************************/
/*!
* @name int deallocate(struct td *deallocate_td)
*
* @brief this function frees resources to be allocated deallocate_td
* by S3CScheduler.
* this function just free the resource by S3CScheduler.
* that is, Channel Resource.
* if there are another struct td at ed_t,
* deallocate() insert the ed_t to TransferReadyQ.
*
* @param [IN] deallocate_td
* - indicates the pointer ot the struct td to be deallocated.
*
* @return
* USB_ERR_SUCCESS -if success to dealloate the resources for the deallocate_td.
* USB_ERR_FAIL -if fail to dealloate the resources for the deallocate_td.
*/
/******************************************************************************/
int deallocate(struct td *deallocate_td)
{
u32 td_addr;
if (get_transferring_td_array(deallocate_td->cur_stransfer.alloc_chnum,
&td_addr) == USB_ERR_SUCCESS) {
if ((u32)deallocate_td == td_addr) {
set_transferring_td_array(deallocate_td->
cur_stransfer.alloc_chnum, 0);
oci_channel_dealloc(deallocate_td->cur_stransfer.
alloc_chnum);
deallocate_td->cur_stransfer.alloc_chnum = CH_NONE;
if (deallocate_td->parent_ed_p->ed_desc.
endpoint_type == BULK_TRANSFER ||
deallocate_td->parent_ed_p->ed_desc.
endpoint_type == CONTROL_TRANSFER) {
/* Increase the available Channel */
dec_nonperio_chnum();
}
deallocate_td->parent_ed_p->is_need_to_insert_scheduler
= true;
if (deallocate_td->parent_ed_p->num_td) {
/* insert ed_t to TransferReadyQ. */
insert_ed_to_ready_q(deallocate_td->parent_ed_p,
false);
deallocate_td->parent_ed_p->ed_status.
is_in_transfer_ready_q = true;
deallocate_td->parent_ed_p->
is_need_to_insert_scheduler = false;
}
return USB_ERR_SUCCESS;
} else
return USB_ERR_FAIL;
} else
return USB_ERR_FAIL;
}
/* TBD.... */
/* transferchecker-common.c
hcd.c */
void do_schedule(struct sec_otghost *otghost)
{
if (get_avail_chnum()) {
do_periodic_schedule(otghost);
do_nonperiodic_schedule(otghost);
}
}
/******************************************************************************/
/*!
* @name int get_td_info(u8 chnum,
* unsigned int *td_addr_p)
*
* @brief this function returns the pointer of
* struct td at TransferringTDArray[chnum]
*
* @param [IN] chnum
* - indicates the index of TransferringTDArray
* to include the address of struct td which we gets
* [OUT] td_addr_p
* - indicate pointer to store the address of struct td.
*
* @return
* USB_ERR_SUCCESS -if success to get the address of struct td.
* USB_ERR_FAIL-if fail to get the address of struct td.
*/
/******************************************************************************/
/* transferchecker-common.c */
int get_td_info(u8 chnum, unsigned int *td_addr_p)
{
u32 td_addr;
if (get_transferring_td_array(chnum, &td_addr) == USB_ERR_SUCCESS) {
*td_addr_p = td_addr;
return USB_ERR_SUCCESS;
}
return USB_ERR_FAIL;
}
|
