/**
* omap3_enter_idle_bm - Checks for any bus activity
* @dev: cpuidle device
* @state: The target state to be programmed
*
* This function checks for any pending activity and then programs
* the device to the specified or a safer state.
*/
static int omap3_enter_idle_bm(struct cpuidle_device *dev,
struct cpuidle_state *state)
{
struct cpuidle_state *new_state;
u32 core_next_state, per_next_state = 0, per_saved_state = 0, cam_state;
struct omap3_idle_statedata *cx;
int ret;
if (!omap3_can_sleep()) {
new_state = dev->safe_state;
goto select_state;
}
/*
* Prevent idle completely if CAM is active.
* CAM does not have wakeup capability in OMAP3.
*/
cam_state = pwrdm_read_pwrst(cam_pd);
if (cam_state == PWRDM_POWER_ON) {
new_state = dev->safe_state;
goto select_state;
}
/*
* FIXME: we currently manage device-specific idle states
* for PER and CORE in combination with CPU-specific
* idle states. This is wrong, and device-specific
* idle management needs to be separated out into
* its own code.
*/
/*
* Prevent PER off if CORE is not in retention or off as this
* would disable PER wakeups completely.
*/
cx = cpuidle_get_statedata(state);
core_next_state = cx->core_state;
per_next_state = per_saved_state = pwrdm_read_next_pwrst(per_pd);
if ((per_next_state == PWRDM_POWER_OFF) &&
(core_next_state > PWRDM_POWER_RET))
per_next_state = PWRDM_POWER_RET;
/* Are we changing PER target state? */
if (per_next_state != per_saved_state)
pwrdm_set_next_pwrst(per_pd, per_next_state);
new_state = next_valid_state(dev, state);
select_state:
dev->last_state = new_state;
ret = omap3_enter_idle(dev, new_state);
/* Restore original PER state if it was modified */
if (per_next_state != per_saved_state)
pwrdm_set_next_pwrst(per_pd, per_saved_state);
return ret;
}
static int omap3_idle_bm_check(void)
{
if (!omap3_can_sleep())
return 1;
return 0;
}
