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/*
* drivers/arisc/interfaces/arisc_dvfs.c
*
* Copyright (c) 2012 Allwinner.
* 2012-10-01 Written by superm (superm@allwinnertech.com).
*
* 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 "../arisc_i.h"
static int dvfs_err_cb(void *arg)
{
ARISC_ERR("dvfs error\n");
return 0;
}
/*
* set specific pll target frequency.
* @freq: target frequency to be set, based on KHZ;
* @pll: which pll will be set
* @mode: the attribute of message, whether syn or asyn;
* @cb: callback handler;
* @cb_arg: callback handler arguments;
*
* return: result, 0 - set frequency successed,
* !0 - set frequency failed;
*/
int arisc_dvfs_set_cpufreq(uint32_t freq, uint32_t pll, uint32_t mode)
{
unsigned int msg_attr = 0;
struct arisc_message *pmessage;
int result = 0;
if (mode & ARISC_DVFS_SYN) {
msg_attr |= ARISC_MESSAGE_ATTR_HARDSYN;
}
/* allocate a message frame */
pmessage = arisc_message_allocate(msg_attr);
if (pmessage == NULL) {
ARISC_WRN("allocate message failed\n");
return -ENOMEM;
}
/* initialize message
*
* |paras[0]|paras[1]|
* |freq |pll |
*/
pmessage->type = ARISC_CPUX_DVFS_REQ;
pmessage->paras[0] = freq;
pmessage->paras[1] = pll;
pmessage->state = ARISC_MESSAGE_INITIALIZED;
pmessage->cb.handler = dvfs_err_cb;
pmessage->cb.arg = NULL;
ARISC_INF("arisc dvfs request : %d\n", freq);
arisc_hwmsgbox_send_message(pmessage, ARISC_SEND_MSG_TIMEOUT);
/* dvfs mode : syn or not */
if (mode & ARISC_DVFS_SYN) {
result = pmessage->result;
arisc_message_free(pmessage);
}
return result;
}
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