drivers/staging/rtl8712/rtl871x_pwrctrl.c

   1 /******************************************************************************
   2  * rtl871x_pwrctrl.c
   3  *
   4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   5  * Linux device driver for RTL8192SU
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * Modifications for inclusion into the Linux staging tree are
  21  * Copyright(c) 2010 Larry Finger. All rights reserved.
  22  *
  23  * Contact information:
  24  * WLAN FAE <[email protected]>
  25  * Larry Finger <[email protected]>
  26  *
  27  ******************************************************************************/
  28
  29 #define _RTL871X_PWRCTRL_C_
  30
  31 #include "osdep_service.h"
  32 #include "drv_types.h"
  33 #include "osdep_intf.h"
  34
  35 #define RTL8712_SDIO_LOCAL_BASE 0X10100000
  36 #define SDIO_HCPWM (RTL8712_SDIO_LOCAL_BASE + 0x0081)
  37
  38 void r8712_set_rpwm(struct _adapter *padapter, u8 val8)
  39 {
  40         u8      rpwm;
  41         struct pwrctrl_priv *pwrpriv = &padapter->pwrctrlpriv;
  42
  43         if (pwrpriv->rpwm == val8) {
  44                 if (pwrpriv->rpwm_retry == 0)
  45                         return;
  46         }
  47         if ((padapter->bDriverStopped == true) ||
  48             (padapter->bSurpriseRemoved == true))
  49                 return;
  50         rpwm = val8 | pwrpriv->tog;
  51         switch (val8) {
  52         case PS_STATE_S1:
  53                 pwrpriv->cpwm = val8;
  54                 break;
  55         case PS_STATE_S2:/* only for USB normal powersave mode use,
  56                           * temp mark some code. */
  57         case PS_STATE_S3:
  58         case PS_STATE_S4:
  59                 pwrpriv->cpwm = val8;
  60                 break;
  61         default:
  62                 break;
  63         }
  64         pwrpriv->rpwm_retry = 0;
  65         pwrpriv->rpwm = val8;
  66         r8712_write8(padapter, 0x1025FE58, rpwm);
  67         pwrpriv->tog += 0x80;
  68 }
  69
  70 void r8712_set_ps_mode(struct _adapter *padapter, uint ps_mode, uint smart_ps)
  71 {
  72         struct pwrctrl_priv *pwrpriv = &padapter->pwrctrlpriv;
  73
  74         if (ps_mode > PM_Card_Disable)
  75                 return;
  76         /* if driver is in active state, we dont need set smart_ps.*/
  77         if (ps_mode == PS_MODE_ACTIVE)
  78                 smart_ps = 0;
  79         if ((pwrpriv->pwr_mode != ps_mode) || (pwrpriv->smart_ps != smart_ps)) {
  80                 if (pwrpriv->pwr_mode == PS_MODE_ACTIVE)
  81                         pwrpriv->bSleep = true;
  82                 else
  83                         pwrpriv->bSleep = false;
  84                 pwrpriv->pwr_mode = ps_mode;
  85                 pwrpriv->smart_ps = smart_ps;
  86                 _set_workitem(&(pwrpriv->SetPSModeWorkItem));
  87         }
  88 }
  89
  90 /*
  91  * Caller:ISR handler...
  92  *
  93  * This will be called when CPWM interrupt is up.
  94  *
  95  * using to update cpwn of drv; and drv will make a decision to up or
  96  * down pwr level
  97  */
  98 void r8712_cpwm_int_hdl(struct _adapter *padapter,
  99                         struct reportpwrstate_parm *preportpwrstate)
 100 {
 101         struct pwrctrl_priv *pwrpriv = &(padapter->pwrctrlpriv);
 102         struct cmd_priv *pcmdpriv = &(padapter->cmdpriv);
 103
 104         if (pwrpriv->cpwm_tog == ((preportpwrstate->state) & 0x80))
 105                 return;
 106         _cancel_timer_ex(&padapter->pwrctrlpriv. rpwm_check_timer);
 107         _enter_pwrlock(&pwrpriv->lock);
 108         pwrpriv->cpwm = (preportpwrstate->state) & 0xf;
 109         if (pwrpriv->cpwm >= PS_STATE_S2) {
 110                 if (pwrpriv->alives & CMD_ALIVE)
 111                         up(&(pcmdpriv->cmd_queue_sema));
 112         }
 113         pwrpriv->cpwm_tog = (preportpwrstate->state) & 0x80;
 114         up(&pwrpriv->lock);
 115 }
 116
 117 static inline void register_task_alive(struct pwrctrl_priv *pwrctrl, uint tag)
 118 {
 119                 pwrctrl->alives |= tag;
 120 }
 121
 122 static inline void unregister_task_alive(struct pwrctrl_priv *pwrctrl, uint tag)
 123 {
 124         if (pwrctrl->alives & tag)
 125                 pwrctrl->alives ^= tag;
 126 }
 127
 128 static void _rpwm_check_handler (struct _adapter *padapter)
 129 {
 130         struct pwrctrl_priv *pwrpriv = &padapter->pwrctrlpriv;
 131
 132         if (padapter->bDriverStopped == true ||
 133             padapter->bSurpriseRemoved == true)
 134                 return;
 135         if (pwrpriv->cpwm != pwrpriv->rpwm)
 136                 _set_workitem(&(pwrpriv->rpwm_workitem));
 137 }
 138
 139 static void SetPSModeWorkItemCallback(struct work_struct *work)
 140 {
 141         struct pwrctrl_priv *pwrpriv = container_of(work,
 142                                        struct pwrctrl_priv, SetPSModeWorkItem);
 143         struct _adapter *padapter = container_of(pwrpriv,
 144                                     struct _adapter, pwrctrlpriv);
 145         if (!pwrpriv->bSleep) {
 146                 _enter_pwrlock(&pwrpriv->lock);
 147                 if (pwrpriv->pwr_mode == PS_MODE_ACTIVE)
 148                         r8712_set_rpwm(padapter, PS_STATE_S4);
 149                 up(&pwrpriv->lock);
 150         }
 151 }
 152
 153 static void rpwm_workitem_callback(struct work_struct *work)
 154 {
 155         struct pwrctrl_priv *pwrpriv = container_of(work,
 156                                        struct pwrctrl_priv, rpwm_workitem);
 157         struct _adapter *padapter = container_of(pwrpriv,
 158                                     struct _adapter, pwrctrlpriv);
 159         u8 cpwm = pwrpriv->cpwm;
 160         if (pwrpriv->cpwm != pwrpriv->rpwm) {
 161                 _enter_pwrlock(&pwrpriv->lock);
 162                 cpwm = r8712_read8(padapter, SDIO_HCPWM);
 163                 pwrpriv->rpwm_retry = 1;
 164                 r8712_set_rpwm(padapter, pwrpriv->rpwm);
 165                 up(&pwrpriv->lock);
 166         }
 167 }
 168
 169 static void rpwm_check_handler (void *FunctionContext)
 170 {
 171         struct _adapter *adapter = (struct _adapter *)FunctionContext;
 172         _rpwm_check_handler(adapter);
 173 }
 174
 175 void r8712_init_pwrctrl_priv(struct _adapter *padapter)
 176 {
 177         struct pwrctrl_priv *pwrctrlpriv = &padapter->pwrctrlpriv;
 178
 179         memset((unsigned char *)pwrctrlpriv, 0, sizeof(struct pwrctrl_priv));
 180         sema_init(&pwrctrlpriv->lock, 1);
 181         pwrctrlpriv->cpwm = PS_STATE_S4;
 182         pwrctrlpriv->pwr_mode = PS_MODE_ACTIVE;
 183         pwrctrlpriv->smart_ps = 0;
 184         pwrctrlpriv->tog = 0x80;
 185 /* clear RPWM to ensure driver and fw back to initial state. */
 186         r8712_write8(padapter, 0x1025FE58, 0);
 187         _init_workitem(&(pwrctrlpriv->SetPSModeWorkItem),
 188                        SetPSModeWorkItemCallback, padapter);
 189         _init_workitem(&(pwrctrlpriv->rpwm_workitem),
 190                        rpwm_workitem_callback, padapter);
 191         _init_timer(&(pwrctrlpriv->rpwm_check_timer),
 192                     padapter->pnetdev, rpwm_check_handler, (u8 *)padapter);
 193 }
 194
 195 /*
 196 Caller: r8712_cmd_thread
 197
 198 Check if the fw_pwrstate is okay for issuing cmd.
 199 If not (cpwm should be is less than P2 state), then the sub-routine
 200 will raise the cpwm to be greater than or equal to P2.
 201
 202 Calling Context: Passive
 203
 204 Return Value:
 205
 206 _SUCCESS: r8712_cmd_thread can issue cmds to firmware afterwards.
 207 _FAIL: r8712_cmd_thread can not do anything.
 208 */
 209 sint r8712_register_cmd_alive(struct _adapter *padapter)
 210 {
 211         uint res = _SUCCESS;
 212         struct pwrctrl_priv *pwrctrl = &padapter->pwrctrlpriv;
 213
 214         _enter_pwrlock(&pwrctrl->lock);
 215         register_task_alive(pwrctrl, CMD_ALIVE);
 216         if (pwrctrl->cpwm < PS_STATE_S2) {
 217                 r8712_set_rpwm(padapter, PS_STATE_S3);
 218                 res = _FAIL;
 219         }
 220         up(&pwrctrl->lock);
 221         return res;
 222 }
 223
 224 /*
 225 Caller: ISR
 226
 227 If ISR's txdone,
 228 No more pkts for TX,
 229 Then driver shall call this fun. to power down firmware again.
 230 */
 231
 232 void r8712_unregister_cmd_alive(struct _adapter *padapter)
 233 {
 234         struct pwrctrl_priv *pwrctrl = &padapter->pwrctrlpriv;
 235
 236         _enter_pwrlock(&pwrctrl->lock);
 237         unregister_task_alive(pwrctrl, CMD_ALIVE);
 238         if ((pwrctrl->cpwm > PS_STATE_S2) &&
 239            (pwrctrl->pwr_mode > PS_MODE_ACTIVE)) {
 240                 if ((pwrctrl->alives == 0) &&
 241                     (check_fwstate(&padapter->mlmepriv,
 242                      _FW_UNDER_LINKING) != true)) {
 243                         r8712_set_rpwm(padapter, PS_STATE_S0);
 244                 }
 245         }
 246         up(&pwrctrl->lock);
 247 }