/**
* omap_hsi_wakeup - Prepare HSI for wakeup from suspend mode (RET/OFF)
*
* Return value :* -ENODEV if HSI platform device or HSI controller or CAWAKE
* Padconf has not been found
* * -EPERM if HSI is not allowed to wakeup the platform.
* * else 0.
*/
int omap_hsi_wakeup(void)
{
struct platform_device *pdev;
struct hsi_dev *hsi_ctrl;
/* TODO: optimize and call this only once, then store and use result
* for subsequent accesses */
pdev = hsi_get_hsi_platform_device();
if (!pdev)
return -ENODEV;
if (!device_may_wakeup(&pdev->dev)) {
dev_info(&pdev->dev, "Modem not allowed to wakeup platform");
return -EPERM;
}
hsi_ctrl = hsi_get_hsi_controller_data(pdev);
if (!hsi_ctrl)
return -ENODEV;
dev_info(hsi_ctrl->dev, "Modem wakeup detected from HSI CAWAKE Pad");
/* CAWAKE falling or rising edge detected */
hsi_ctrl->hsi_port->cawake_off_event = true;
tasklet_hi_schedule(&hsi_ctrl->hsi_port->hsi_tasklet);
/* Disable interrupt until Bottom Half has cleared */
/* the IRQ status register */
disable_irq_nosync(hsi_ctrl->hsi_port->irq);
return 0;
}
/**
* omap_hsi_wakeup - Prepare HSI for wakeup from suspend mode (RET/OFF)
*
* @hsi_port - reference to the HSI port which triggered wakeup.
* Range [1, 2]
*
* Return value : * 0 if HSI tasklet scheduled.
* * negative value else.
*/
int omap_hsi_wakeup(int hsi_port)
{
static struct platform_device *pdev;
static struct hsi_dev *hsi_ctrl;
int i;
if (!pdev) {
pdev = hsi_get_hsi_platform_device();
if (!pdev)
return -ENODEV;
}
if (!device_may_wakeup(&pdev->dev)) {
dev_info(&pdev->dev, "Modem not allowed to wakeup platform\n");
return -EPERM;
}
if (!hsi_ctrl) {
hsi_ctrl = hsi_get_hsi_controller_data(pdev);
if (!hsi_ctrl)
return -ENODEV;
}
for (i = 0; i < omap_hsi_platform_data.num_ports; i++) {
if (omap_hsi_platform_data.ctx->pctx[i].port_number == hsi_port)
break;
}
if (i == omap_hsi_platform_data.num_ports)
return -ENODEV;
/* Check no other interrupt handler has already scheduled the tasklet */
if (test_and_set_bit(HSI_FLAGS_TASKLET_LOCK,
&hsi_ctrl->hsi_port[i].flags))
return -EBUSY;
//dev_dbg(hsi_ctrl->dev, "Modem wakeup detected from HSI CAWAKE Pad port "
// "%d\n", hsi_port);
/* CAWAKE falling or rising edge detected */
hsi_ctrl->hsi_port[i].cawake_off_event = true;
tasklet_hi_schedule(&hsi_ctrl->hsi_port[i].hsi_tasklet);
/* Disable interrupt until Bottom Half has cleared */
/* the IRQ status register */
disable_irq_nosync(hsi_ctrl->hsi_port[i].irq);
return 0;
}
/**
* omap_hsi_prepare_suspend - Prepare HSI for suspend mode (OFF)
*
* Return value : -ENODEV if HSI controller has not been found, else 0.
*
*/
int omap_hsi_prepare_suspend(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 (device_may_wakeup(&pdev->dev))
omap_mux_enable_wakeup(OMAP_HSI_PADCONF_CAWAKE_PIN);
else
omap_mux_disable_wakeup(OMAP_HSI_PADCONF_CAWAKE_PIN);
return 0;
}
/**
* 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;
}
/**
* omap_hsi_resume_idle - Prepare HSI for wakeup from low power
*
* Return value :* -ENODEV if HSI platform device or HSI controller or CAWAKE
* Padconf has not been found
* * -EPERM if HSI is not allowed to wakeup the platform.
* * else 0.
*
*/
int omap_hsi_resume_idle(void)
{
struct platform_device *pdev;
struct hsi_dev *hsi_ctrl;
u16 val;
pdev = hsi_get_hsi_platform_device();
if (!pdev)
return -ENODEV;
if (!device_may_wakeup(&pdev->dev))
return -EPERM;
hsi_ctrl = hsi_get_hsi_controller_data(pdev);
if (!hsi_ctrl)
return -ENODEV;
/* Check for IO pad wakeup */
val = omap_mux_read_signal(OMAP_HSI_PADCONF_CAWAKE_PIN);
if (val == -ENODEV)
return val;
if (val & OMAP44XX_PADCONF_WAKEUPEVENT0) {
dev_dbg(hsi_ctrl->dev, "HSI WAKEUP DETECTED from PADCONF : "
"0x%04x\n", val);
/* CAWAKE falling or rising edge detected */
hsi_ctrl->hsi_port->cawake_off_event = true;
tasklet_hi_schedule(&hsi_ctrl->hsi_port->hsi_tasklet);
/* Disable interrupt until Bottom Half has cleared */
/* the IRQ status register */
disable_irq_nosync(hsi_ctrl->hsi_port->irq);
}
return 0;
}
/**
* omap_hsi_prepare_suspend - Prepare HSI for suspend mode (OFF)
*
* Return value : -ENODEV if HSI controller has not been found, else 0.
*
*/
int omap_hsi_prepare_suspend(void)
{
struct platform_device *pdev;
struct hsi_dev *hsi_ctrl;
u16 val;
pdev = hsi_get_hsi_platform_device();
hsi_ctrl = hsi_get_hsi_controller_data(pdev);
if (!hsi_ctrl)
return -ENODEV;
/* If HSI is enabled, CAWAKE IO wakeup has been disabled and */
/* we don't want to re-enable it here. HSI interrupt shall be */
/* generated normally because HSI HW is ON. */
if (hsi_ctrl->clock_enabled) {
dev_info(hsi_ctrl->dev, "Platform Suspend while HSI active\n");
return 0;
}
/* Check for IO pad wakeup */
val = omap_mux_read_signal(OMAP_HSI_PADCONF_CAWAKE_PIN);
if (val == -ENODEV)
return -ENODEV;
/* HSI can only wakeup OMAP if CAWAKE is muxed */
if ((val & OMAP_MUX_MODE_MASK) != OMAP_HSI_PADCONF_CAWAKE_MODE)
return 0;
if (device_may_wakeup(&pdev->dev))
omap_hsi_wakeup_enable(hsi_ctrl, 0);
else
omap_hsi_wakeup_disable(hsi_ctrl, 0);
return 0;
}