release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/tidspbridge/rmgr/pwr.c

   1 /*
   2  * pwr.c
   3  *
   4  * DSP-BIOS Bridge driver support functions for TI OMAP processors.
   5  *
   6  * PWR API for controlling DSP power states.
   7  *
   8  * Copyright (C) 2005-2006 Texas Instruments, Inc.
   9  *
  10  * This package is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  16  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  17  */
  18
  19 /*  ----------------------------------- Host OS */
  20 #include <dspbridge/host_os.h>
  21
  22 /*  ----------------------------------- This */
  23 #include <dspbridge/pwr.h>
  24
  25 /*  ----------------------------------- Resource Manager */
  26 #include <dspbridge/devdefs.h>
  27 #include <dspbridge/drv.h>
  28
  29 /*  ----------------------------------- Platform Manager */
  30 #include <dspbridge/dev.h>
  31
  32 /*  ----------------------------------- Link Driver */
  33 #include <dspbridge/dspioctl.h>
  34
  35 /*
  36  *  ======== pwr_sleep_dsp ========
  37  *    Send command to DSP to enter sleep state.
  38  */
  39 int pwr_sleep_dsp(const u32 sleep_code, const u32 timeout)
  40 {
  41         struct bridge_drv_interface *intf_fxns;
  42         struct bridge_dev_context *dw_context;
  43         int status = -EPERM;
  44         struct dev_object *hdev_obj = NULL;
  45         u32 ioctlcode = 0;
  46         u32 arg = timeout;
  47
  48         for (hdev_obj = (struct dev_object *)drv_get_first_dev_object();
  49              hdev_obj != NULL;
  50              hdev_obj =
  51              (struct dev_object *)drv_get_next_dev_object((u32) hdev_obj)) {
  52                 if (dev_get_bridge_context(hdev_obj,
  53                                                 (struct bridge_dev_context **)
  54                                                    &dw_context)) {
  55                         continue;
  56                 }
  57                 if (dev_get_intf_fxns(hdev_obj,
  58                                                 (struct bridge_drv_interface **)
  59                                                 &intf_fxns)) {
  60                         continue;
  61                 }
  62                 if (sleep_code == PWR_DEEPSLEEP)
  63                         ioctlcode = BRDIOCTL_DEEPSLEEP;
  64                 else if (sleep_code == PWR_EMERGENCYDEEPSLEEP)
  65                         ioctlcode = BRDIOCTL_EMERGENCYSLEEP;
  66                 else
  67                         status = -EINVAL;
  68
  69                 if (status != -EINVAL) {
  70                         status = (*intf_fxns->pfn_dev_cntrl) (dw_context,
  71                                                               ioctlcode,
  72                                                               (void *)&arg);
  73                 }
  74         }
  75         return status;
  76 }
  77
  78 /*
  79  *  ======== pwr_wake_dsp ========
  80  *    Send command to DSP to wake it from sleep.
  81  */
  82 int pwr_wake_dsp(const u32 timeout)
  83 {
  84         struct bridge_drv_interface *intf_fxns;
  85         struct bridge_dev_context *dw_context;
  86         int status = -EPERM;
  87         struct dev_object *hdev_obj = NULL;
  88         u32 arg = timeout;
  89
  90         for (hdev_obj = (struct dev_object *)drv_get_first_dev_object();
  91              hdev_obj != NULL;
  92              hdev_obj = (struct dev_object *)drv_get_next_dev_object
  93              ((u32) hdev_obj)) {
  94                 if (!(dev_get_bridge_context(hdev_obj,
  95                                                       (struct bridge_dev_context
  96                                                        **)&dw_context))) {
  97                         if (!(dev_get_intf_fxns(hdev_obj,
  98                               (struct bridge_drv_interface **)&intf_fxns))) {
  99                                 status =
 100                                     (*intf_fxns->pfn_dev_cntrl) (dw_context,
 101                                                         BRDIOCTL_WAKEUP,
 102                                                         (void *)&arg);
 103                         }
 104                 }
 105         }
 106         return status;
 107 }
 108
 109 /*
 110  *  ======== pwr_pm_pre_scale========
 111  *    Sends pre-notification message to DSP.
 112  */
 113 int pwr_pm_pre_scale(u16 voltage_domain, u32 level)
 114 {
 115         struct bridge_drv_interface *intf_fxns;
 116         struct bridge_dev_context *dw_context;
 117         int status = -EPERM;
 118         struct dev_object *hdev_obj = NULL;
 119         u32 arg[2];
 120
 121         arg[0] = voltage_domain;
 122         arg[1] = level;
 123
 124         for (hdev_obj = (struct dev_object *)drv_get_first_dev_object();
 125              hdev_obj != NULL;
 126              hdev_obj = (struct dev_object *)drv_get_next_dev_object
 127              ((u32) hdev_obj)) {
 128                 if (!(dev_get_bridge_context(hdev_obj,
 129                                                       (struct bridge_dev_context
 130                                                        **)&dw_context))) {
 131                         if (!(dev_get_intf_fxns(hdev_obj,
 132                               (struct bridge_drv_interface **)&intf_fxns))) {
 133                                 status =
 134                                     (*intf_fxns->pfn_dev_cntrl) (dw_context,
 135                                                 BRDIOCTL_PRESCALE_NOTIFY,
 136                                                 (void *)&arg);
 137                         }
 138                 }
 139         }
 140         return status;
 141 }
 142
 143 /*
 144  *  ======== pwr_pm_post_scale========
 145  *    Sends post-notification message to DSP.
 146  */
 147 int pwr_pm_post_scale(u16 voltage_domain, u32 level)
 148 {
 149         struct bridge_drv_interface *intf_fxns;
 150         struct bridge_dev_context *dw_context;
 151         int status = -EPERM;
 152         struct dev_object *hdev_obj = NULL;
 153         u32 arg[2];
 154
 155         arg[0] = voltage_domain;
 156         arg[1] = level;
 157
 158         for (hdev_obj = (struct dev_object *)drv_get_first_dev_object();
 159              hdev_obj != NULL;
 160              hdev_obj = (struct dev_object *)drv_get_next_dev_object
 161              ((u32) hdev_obj)) {
 162                 if (!(dev_get_bridge_context(hdev_obj,
 163                                                       (struct bridge_dev_context
 164                                                        **)&dw_context))) {
 165                         if (!(dev_get_intf_fxns(hdev_obj,
 166                               (struct bridge_drv_interface **)&intf_fxns))) {
 167                                 status =
 168                                     (*intf_fxns->pfn_dev_cntrl) (dw_context,
 169                                                 BRDIOCTL_POSTSCALE_NOTIFY,
 170                                                 (void *)&arg);
 171                         }
 172                 }
 173         }
 174         return status;
 175
 176 }