/*
 *  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;
}