/******************************************************************************
 * rtl871x_pwrctrl.c
 *
 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
 * Linux device driver for RTL8192SU
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * Modifications for inclusion into the Linux staging tree are
 * Copyright(c) 2010 Larry Finger. All rights reserved.
 *
 * Contact information:
 * WLAN FAE <wlanfae@realtek.com>
 * Larry Finger <Larry.Finger@lwfinger.net>
 *
 ******************************************************************************/

#define _RTL871X_PWRCTRL_C_

#include "osdep_service.h"
#include "drv_types.h"
#include "osdep_intf.h"

#define RTL8712_SDIO_LOCAL_BASE 0X10100000
#define SDIO_HCPWM (RTL8712_SDIO_LOCAL_BASE + 0x0081)

void r8712_set_rpwm(struct _adapter *padapter, u8 val8)
{
	u8	rpwm;
	struct pwrctrl_priv *pwrpriv = &padapter->pwrctrlpriv;

	if (pwrpriv->rpwm == val8) {
		if (pwrpriv->rpwm_retry == 0)
			return;
	}
	if ((padapter->bDriverStopped == true) ||
	    (padapter->bSurpriseRemoved == true))
		return;
	rpwm = val8 | pwrpriv->tog;
	switch (val8) {
	case PS_STATE_S1:
		pwrpriv->cpwm = val8;
		break;
	case PS_STATE_S2:/* only for USB normal powersave mode use,
			  * temp mark some code. */
	case PS_STATE_S3:
	case PS_STATE_S4:
		pwrpriv->cpwm = val8;
		break;
	default:
		break;
	}
	pwrpriv->rpwm_retry = 0;
	pwrpriv->rpwm = val8;
	r8712_write8(padapter, 0x1025FE58, rpwm);
	pwrpriv->tog += 0x80;
}

void r8712_set_ps_mode(struct _adapter *padapter, uint ps_mode, uint smart_ps)
{
	struct pwrctrl_priv *pwrpriv = &padapter->pwrctrlpriv;

	if (ps_mode > PM_Card_Disable)
		return;
	/* if driver is in active state, we dont need set smart_ps.*/
	if (ps_mode == PS_MODE_ACTIVE)
		smart_ps = 0;
	if ((pwrpriv->pwr_mode != ps_mode) || (pwrpriv->smart_ps != smart_ps)) {
		if (pwrpriv->pwr_mode == PS_MODE_ACTIVE)
			pwrpriv->bSleep = true;
		else
			pwrpriv->bSleep = false;
		pwrpriv->pwr_mode = ps_mode;
		pwrpriv->smart_ps = smart_ps;
		schedule_work(&pwrpriv->SetPSModeWorkItem);
	}
}

/*
 * Caller:ISR handler...
 *
 * This will be called when CPWM interrupt is up.
 *
 * using to update cpwn of drv; and drv will make a decision to up or
 * down pwr level
 */
void r8712_cpwm_int_hdl(struct _adapter *padapter,
			struct reportpwrstate_parm *preportpwrstate)
{
	struct pwrctrl_priv *pwrpriv = &(padapter->pwrctrlpriv);
	struct cmd_priv	*pcmdpriv = &(padapter->cmdpriv);

	if (pwrpriv->cpwm_tog == ((preportpwrstate->state) & 0x80))
		return;
	_cancel_timer_ex(&padapter->pwrctrlpriv. rpwm_check_timer);
	_enter_pwrlock(&pwrpriv->lock);
	pwrpriv->cpwm = (preportpwrstate->state) & 0xf;
	if (pwrpriv->cpwm >= PS_STATE_S2) {
		if (pwrpriv->alives & CMD_ALIVE)
			up(&(pcmdpriv->cmd_queue_sema));
	}
	pwrpriv->cpwm_tog = (preportpwrstate->state) & 0x80;
	up(&pwrpriv->lock);
}

static inline void register_task_alive(struct pwrctrl_priv *pwrctrl, uint tag)
{
		pwrctrl->alives |= tag;
}

static inline void unregister_task_alive(struct pwrctrl_priv *pwrctrl, uint tag)
{
	if (pwrctrl->alives & tag)
		pwrctrl->alives ^= tag;
}

static void _rpwm_check_handler (struct _adapter *padapter)
{
	struct pwrctrl_priv *pwrpriv = &padapter->pwrctrlpriv;

	if (padapter->bDriverStopped == true ||
	    padapter->bSurpriseRemoved == true)
		return;
	if (pwrpriv->cpwm != pwrpriv->rpwm)
		schedule_work(&pwrpriv->rpwm_workitem);
}

static void SetPSModeWorkItemCallback(struct work_struct *work)
{
	struct pwrctrl_priv *pwrpriv = container_of(work,
				       struct pwrctrl_priv, SetPSModeWorkItem);
	struct _adapter *padapter = container_of(pwrpriv,
				    struct _adapter, pwrctrlpriv);
	if (!pwrpriv->bSleep) {
		_enter_pwrlock(&pwrpriv->lock);
		if (pwrpriv->pwr_mode == PS_MODE_ACTIVE)
			r8712_set_rpwm(padapter, PS_STATE_S4);
		up(&pwrpriv->lock);
	}
}

static void rpwm_workitem_callback(struct work_struct *work)
{
	struct pwrctrl_priv *pwrpriv = container_of(work,
				       struct pwrctrl_priv, rpwm_workitem);
	struct _adapter *padapter = container_of(pwrpriv,
				    struct _adapter, pwrctrlpriv);
	u8 cpwm = pwrpriv->cpwm;
	if (pwrpriv->cpwm != pwrpriv->rpwm) {
		_enter_pwrlock(&pwrpriv->lock);
		cpwm = r8712_read8(padapter, SDIO_HCPWM);
		pwrpriv->rpwm_retry = 1;
		r8712_set_rpwm(padapter, pwrpriv->rpwm);
		up(&pwrpriv->lock);
	}
}

static void rpwm_check_handler (void *FunctionContext)
{
	struct _adapter *adapter = (struct _adapter *)FunctionContext;
	_rpwm_check_handler(adapter);
}

void r8712_init_pwrctrl_priv(struct _adapter *padapter)
{
	struct pwrctrl_priv *pwrctrlpriv = &padapter->pwrctrlpriv;

	memset((unsigned char *)pwrctrlpriv, 0, sizeof(struct pwrctrl_priv));
	sema_init(&pwrctrlpriv->lock, 1);
	pwrctrlpriv->cpwm = PS_STATE_S4;
	pwrctrlpriv->pwr_mode = PS_MODE_ACTIVE;
	pwrctrlpriv->smart_ps = 0;
	pwrctrlpriv->tog = 0x80;
/* clear RPWM to ensure driver and fw back to initial state. */
	r8712_write8(padapter, 0x1025FE58, 0);
	INIT_WORK(&pwrctrlpriv->SetPSModeWorkItem, SetPSModeWorkItemCallback);
	INIT_WORK(&pwrctrlpriv->rpwm_workitem, rpwm_workitem_callback);
	_init_timer(&(pwrctrlpriv->rpwm_check_timer),
		    padapter->pnetdev, rpwm_check_handler, (u8 *)padapter);
}

/*
Caller: r8712_cmd_thread

Check if the fw_pwrstate is okay for issuing cmd.
If not (cpwm should be is less than P2 state), then the sub-routine
will raise the cpwm to be greater than or equal to P2.

Calling Context: Passive

Return Value:

_SUCCESS: r8712_cmd_thread can issue cmds to firmware afterwards.
_FAIL: r8712_cmd_thread can not do anything.
*/
sint r8712_register_cmd_alive(struct _adapter *padapter)
{
	uint res = _SUCCESS;
	struct pwrctrl_priv *pwrctrl = &padapter->pwrctrlpriv;

	_enter_pwrlock(&pwrctrl->lock);
	register_task_alive(pwrctrl, CMD_ALIVE);
	if (pwrctrl->cpwm < PS_STATE_S2) {
		r8712_set_rpwm(padapter, PS_STATE_S3);
		res = _FAIL;
	}
	up(&pwrctrl->lock);
	return res;
}

/*
Caller: ISR

If ISR's txdone,
No more pkts for TX,
Then driver shall call this fun. to power down firmware again.
*/

void r8712_unregister_cmd_alive(struct _adapter *padapter)
{
	struct pwrctrl_priv *pwrctrl = &padapter->pwrctrlpriv;

	_enter_pwrlock(&pwrctrl->lock);
	unregister_task_alive(pwrctrl, CMD_ALIVE);
	if ((pwrctrl->cpwm > PS_STATE_S2) &&
	   (pwrctrl->pwr_mode > PS_MODE_ACTIVE)) {
		if ((pwrctrl->alives == 0) &&
		    (check_fwstate(&padapter->mlmepriv,
		     _FW_UNDER_LINKING) != true)) {
			r8712_set_rpwm(padapter, PS_STATE_S0);
		}
	}
	up(&pwrctrl->lock);
}