/**
* hsi_do_cawake_process - CAWAKE line management
* @pport - HSI port to process
*
* This function handles the CAWAKE L/H transitions and call the event callback
* accordingly.
*
* Returns 0 if CAWAKE event process, -EAGAIN if CAWAKE event processing is
* delayed due to a pending DMA interrupt.
* If -EAGAIN is returned, pport->hsi_tasklet has to be re-scheduled once
* DMA tasklet has be executed. This should be done automatically by driver.
*
*/
int hsi_do_cawake_process(struct hsi_port *pport)
{
struct hsi_dev *hsi_ctrl = pport->hsi_controller;
bool cawake_status = hsi_get_cawake(pport);
if (pport->wake_rx_3_wires_mode) {
dev_warn(hsi_ctrl->dev, "CAWAKE edge in RX 3 wires, exiting\n");
return 0;
}
/* Deal with init condition */
if (unlikely(pport->cawake_status < 0))
pport->cawake_status = !cawake_status;
dev_dbg(hsi_ctrl->dev, "%s: Interrupts are not enabled but CAWAKE came."
"hsi: port[%d] irq[%d] irq_en=0x%08x dma_irq_en=0x%08x\n",
__func__, pport->port_number, pport->n_irq,
hsi_inl(pport->hsi_controller->base,
HSI_SYS_MPU_ENABLE_REG(pport->port_number,
pport->n_irq)),
hsi_inl(pport->hsi_controller->base,
HSI_SYS_GDD_MPU_IRQ_ENABLE_REG));
/* Check CAWAKE line status */
if (cawake_status) {
dev_dbg(hsi_ctrl->dev, "CAWAKE rising edge detected\n");
/* Check for possible mismatch (race condition) */
if (unlikely(pport->cawake_status)) {
dev_warn(hsi_ctrl->dev,
"Missed previous CAWAKE falling edge...\n");
spin_unlock(&hsi_ctrl->lock);
hsi_port_event_handler(pport, HSI_EVENT_CAWAKE_DOWN,
NULL);
spin_lock(&hsi_ctrl->lock);
/* In case another CAWAKE interrupt occured and caused
* a race condition, clear CAWAKE backup interrupt to
* avoid handling twice the race condition */
hsi_driver_ack_interrupt(pport, HSI_CAWAKEDETECTED,
true);
}
pport->cawake_status = 1;
spin_unlock(&hsi_ctrl->lock);
hsi_port_event_handler(pport, HSI_EVENT_CAWAKE_UP, NULL);
spin_lock(&hsi_ctrl->lock);
/*
* HSI - OMAP4430-2.2BUG00055: i702
* HSI: DSP Swakeup generated is the same than MPU Swakeup.
* System cannot enter in off mode due to the DSP.
*/
if (is_hsi_errata(hsi_ctrl, HSI_ERRATUM_i702_PM_HSI_SWAKEUP))
omap_pm_clear_dsp_wake_up();
} else {
dev_dbg(hsi_ctrl->dev, "CAWAKE falling edge detected\n");
/* Check for pending DMA interrupt */
if (hsi_is_dma_read_int_pending(hsi_ctrl)) {
dev_dbg(hsi_ctrl->dev, "Pending DMA Read interrupt "
"before CAWAKE->L, exiting "
"Interrupt tasklet.\n");
return -EAGAIN;
}
if (unlikely(!pport->cawake_status)) {
dev_warn(hsi_ctrl->dev,
"Missed previous CAWAKE rising edge...\n");
spin_unlock(&hsi_ctrl->lock);
hsi_port_event_handler(pport, HSI_EVENT_CAWAKE_UP,
NULL);
spin_lock(&hsi_ctrl->lock);
/* In case another CAWAKE interrupt occured and caused
* a race condition, clear CAWAKE backup interrupt to
* avoid handling twice the race condition */
hsi_driver_ack_interrupt(pport, HSI_CAWAKEDETECTED,
true);
}
pport->cawake_status = 0;
spin_unlock(&hsi_ctrl->lock);
hsi_port_event_handler(pport, HSI_EVENT_CAWAKE_DOWN, NULL);
spin_lock(&hsi_ctrl->lock);
}
/* If another CAWAKE event occured while previous is still processed */
/* do not clear the status bit */
cawake_status = hsi_get_cawake(pport);
if (cawake_status != pport->cawake_status) {
dev_warn(hsi_ctrl->dev, "CAWAKE line changed to %d while CAWAKE"
"event is still being processed\n",
cawake_status);
return -EAGAIN;
}
return 0;
}
/**
* hsi_do_cawake_process - CAWAKE line management
* @pport - HSI port to process
*
* This function handles the CAWAKE L/H transitions and call the event callback
* accordingly.
*
* Returns 0 if CAWAKE event process, -EAGAIN if CAWAKE event processing is
* delayed due to a pending DMA interrupt.
* If -EAGAIN is returned, pport->hsi_tasklet has to be re-scheduled once
* DMA tasklet has be executed. This should be done automatically by driver.
*
*/
int hsi_do_cawake_process(struct hsi_port *pport)
{
struct hsi_dev *hsi_ctrl = pport->hsi_controller;
bool cawake_status = hsi_get_cawake(pport);
if (pport->wake_rx_3_wires_mode) {
dev_warn(hsi_ctrl->dev, "CAWAKE edge in RX 3 wires, exiting\n");
return 0;
}
/* Deal with init condition */
if (unlikely(pport->cawake_status < 0))
pport->cawake_status = !cawake_status;
/* Check CAWAKE line status */
if (cawake_status) {
dev_dbg(hsi_ctrl->dev, "CAWAKE rising edge detected\n");
/* Check for possible mismatch (race condition) */
if (unlikely(pport->cawake_status)) {
dev_warn(hsi_ctrl->dev,
"Missed previous CAWAKE falling edge...\n");
spin_unlock(&hsi_ctrl->lock);
hsi_port_event_handler(pport, HSI_EVENT_CAWAKE_DOWN,
NULL);
spin_lock(&hsi_ctrl->lock);
/* In case another CAWAKE interrupt occured and caused
* a race condition, clear CAWAKE backup interrupt to
* avoid handling twice the race condition */
hsi_driver_ack_interrupt(pport, HSI_CAWAKEDETECTED,
true);
}
pport->cawake_status = 1;
/* Allow data reception */
hsi_hsr_resume(hsi_ctrl);
spin_unlock(&hsi_ctrl->lock);
hsi_port_event_handler(pport, HSI_EVENT_CAWAKE_UP, NULL);
spin_lock(&hsi_ctrl->lock);
/*
* HSI - OMAP4430-2.2BUG00055: i702
* HSI: DSP Swakeup generated is the same than MPU Swakeup.
* System cannot enter in off mode due to the DSP.
*/
if (is_hsi_errata(hsi_ctrl, HSI_ERRATUM_i702_PM_HSI_SWAKEUP))
omap_pm_clear_dsp_wake_up();
} else {
dev_dbg(hsi_ctrl->dev, "CAWAKE falling edge detected\n");
/* Check for pending DMA interrupt */
if (hsi_is_dma_read_int_pending(hsi_ctrl)) {
dev_dbg(hsi_ctrl->dev, "Pending DMA Read interrupt "
"before CAWAKE->L, exiting "
"Interrupt tasklet.\n");
return -EAGAIN;
}
if (unlikely(!pport->cawake_status)) {
dev_warn(hsi_ctrl->dev,
"Missed previous CAWAKE rising edge...\n");
spin_unlock(&hsi_ctrl->lock);
hsi_port_event_handler(pport, HSI_EVENT_CAWAKE_UP,
NULL);
spin_lock(&hsi_ctrl->lock);
/* In case another CAWAKE interrupt occured and caused
* a race condition, clear CAWAKE backup interrupt to
* avoid handling twice the race condition */
hsi_driver_ack_interrupt(pport, HSI_CAWAKEDETECTED,
true);
}
pport->cawake_status = 0;
/* Forbid data reception */
hsi_hsr_suspend(hsi_ctrl);
spin_unlock(&hsi_ctrl->lock);
hsi_port_event_handler(pport, HSI_EVENT_CAWAKE_DOWN, NULL);
spin_lock(&hsi_ctrl->lock);
}
return 0;
}
