/**
* hsi_clocks_disable_channel - virtual wrapper for disabling HSI clocks for
* a given channel
* @dev - reference to the hsi device.
* @channel_number - channel number which requests clock to be disabled
* 0xFF means no particular channel
*
* Note : there is no real HW clock management per HSI channel, this is only
* virtual to keep track of active channels and ease debug
*
* Function to be called with lock
*/
void hsi_clocks_disable_channel(struct device *dev, u8 channel_number,
const char *s)
{
struct platform_device *pd = to_platform_device(dev);
struct hsi_dev *hsi_ctrl = platform_get_drvdata(pd);
if (channel_number != HSI_CH_NUMBER_NONE)
dev_dbg(dev, "CLK: hsi_clocks_disable for "
"channel %d: %s\n", channel_number, s);
else
dev_dbg(dev, "CLK: hsi_clocks_disable: %s\n", s);
if (!hsi_ctrl->clock_enabled) {
dev_dbg(dev, "Clocks already disabled, skipping...\n");
return;
}
if (hsi_is_hsi_controller_busy(hsi_ctrl)) {
dev_dbg(dev, "Cannot disable clocks, HSI port busy\n");
return;
}
if (hsi_is_hst_controller_busy(hsi_ctrl))
dev_warn(dev, "Disabling clocks with HST FSM not IDLE !\n");
#ifndef USE_PM_RUNTIME_FOR_HSI
hsi_runtime_suspend(dev);
omap_device_idle(pd);
#else
/* HSI_TODO : this can probably be changed
* to return pm_runtime_put(dev);
*/
pm_runtime_put_sync(dev);
#endif
}
/**
* hsi_clocks_disable_channel - virtual wrapper for disabling HSI clocks for
* a given channel
* @dev - reference to the hsi device.
* @channel_number - channel number which requests clock to be disabled
* 0xFF means no particular channel
*
* Note : there is no real HW clock management per HSI channel, this is only
* virtual to keep track of active channels and ease debug
*
* Function to be called with lock
*/
void hsi_clocks_disable_channel(struct device *dev, u8 channel_number,
const char *s)
{
struct platform_device *pd = to_platform_device(dev);
struct hsi_platform_data *pdata = dev_get_platdata(dev);
struct hsi_dev *hsi_ctrl = platform_get_drvdata(pd);
int ret;
if (channel_number != HSI_CH_NUMBER_NONE)
dev_dbg(dev, "CLK: hsi_clocks_disable for "
"channel %d: %s\n", channel_number, s);
else
dev_dbg(dev, "CLK: hsi_clocks_disable: %s\n", s);
if (!hsi_ctrl->clock_enabled) {
dev_dbg(dev, "Clocks already disabled, skipping...\n");
return;
}
if (hsi_is_hsi_controller_busy(hsi_ctrl)) {
dev_dbg(dev, "Cannot disable clocks, HSI port busy\n");
return;
}
if (hsi_is_hst_controller_busy(hsi_ctrl))
#if 1
dev_dbg(dev, "Disabling clocks with HST FSM not IDLE !\n");
#endif
#ifdef CONFIG_PM
/* Allow Fclk to change */
if (dpll_cascading_blocker_release(dev) < 0)
dev_warn(dev, "Error releasing DPLL cascading constraint\n");
#endif /* CONFIG_PM */
#ifndef USE_PM_RUNTIME_FOR_HSI
hsi_runtime_suspend(dev);
ret = pdata->device_idle(pd);
if (ret)
dev_err(dev, "Failed to idle device: %s %d\n", s, ret);
#else
/* HSI_TODO : this can probably be changed
* to return pm_runtime_put(dev);
*/
pm_runtime_put_sync(dev);
#endif
}
/**
* omap_hsi_prepare_idle - Prepare HSI for idle to low power
*
* Return value : -ENODEV if HSI controller has not been found, else 0.
*
*/
int omap_hsi_prepare_idle(void)
{
struct platform_device *pdev;
struct hsi_dev *hsi_ctrl;
pdev = hsi_get_hsi_platform_device();
hsi_ctrl = hsi_get_hsi_controller_data(pdev);
if (!hsi_ctrl)
return -ENODEV;
/* If hsi_clocks_disable_channel() is used, it prevents board to */
/* enter sleep, due to the checks of HSI controller status. */
/* This is why we call directly the omap_device_xxx() function here */
hsi_runtime_suspend(hsi_ctrl->dev);
omap_device_idle(pdev);
return 0;
}
