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path: root/drivers/bus/mhi/core/main.c
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Diffstat (limited to 'drivers/bus/mhi/core/main.c')
-rw-r--r--drivers/bus/mhi/core/main.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index 347bbff7a35e..9592861b0514 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -144,6 +144,11 @@ enum mhi_state mhi_get_mhi_state(struct mhi_controller *mhi_cntrl)
return ret ? MHI_STATE_MAX : state;
}
+static void *mhi_to_virtual(struct mhi_ring *ring, dma_addr_t addr)
+{
+ return (addr - ring->iommu_base) + ring->base;
+}
+
int mhi_destroy_device(struct device *dev, void *data)
{
struct mhi_device *mhi_dev;
@@ -247,3 +252,87 @@ void mhi_create_devices(struct mhi_controller *mhi_cntrl)
mhi_dealloc_device(mhi_cntrl, mhi_dev);
}
}
+
+irqreturn_t mhi_irq_handler(int irq_number, void *dev)
+{
+ struct mhi_event *mhi_event = dev;
+ struct mhi_controller *mhi_cntrl = mhi_event->mhi_cntrl;
+ struct mhi_event_ctxt *er_ctxt =
+ &mhi_cntrl->mhi_ctxt->er_ctxt[mhi_event->er_index];
+ struct mhi_ring *ev_ring = &mhi_event->ring;
+ void *dev_rp = mhi_to_virtual(ev_ring, er_ctxt->rp);
+
+ /* Only proceed if event ring has pending events */
+ if (ev_ring->rp == dev_rp)
+ return IRQ_HANDLED;
+
+ /* For client managed event ring, notify pending data */
+ if (mhi_event->cl_manage) {
+ struct mhi_chan *mhi_chan = mhi_event->mhi_chan;
+ struct mhi_device *mhi_dev = mhi_chan->mhi_dev;
+
+ if (mhi_dev)
+ mhi_notify(mhi_dev, MHI_CB_PENDING_DATA);
+ } else {
+ tasklet_schedule(&mhi_event->task);
+ }
+
+ return IRQ_HANDLED;
+}
+
+irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *dev)
+{
+ struct mhi_controller *mhi_cntrl = dev;
+ enum mhi_state state = MHI_STATE_MAX;
+ enum mhi_pm_state pm_state = 0;
+ enum mhi_ee_type ee = 0;
+
+ write_lock_irq(&mhi_cntrl->pm_lock);
+ if (MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) {
+ state = mhi_get_mhi_state(mhi_cntrl);
+ ee = mhi_cntrl->ee;
+ mhi_cntrl->ee = mhi_get_exec_env(mhi_cntrl);
+ }
+
+ if (state == MHI_STATE_SYS_ERR) {
+ dev_dbg(mhi_cntrl->dev, "System error detected\n");
+ pm_state = mhi_tryset_pm_state(mhi_cntrl,
+ MHI_PM_SYS_ERR_DETECT);
+ }
+ write_unlock_irq(&mhi_cntrl->pm_lock);
+
+ /* If device in RDDM don't bother processing SYS error */
+ if (mhi_cntrl->ee == MHI_EE_RDDM) {
+ if (mhi_cntrl->ee != ee) {
+ mhi_cntrl->status_cb(mhi_cntrl, mhi_cntrl->priv_data,
+ MHI_CB_EE_RDDM);
+ wake_up_all(&mhi_cntrl->state_event);
+ }
+ goto exit_intvec;
+ }
+
+ if (pm_state == MHI_PM_SYS_ERR_DETECT) {
+ wake_up_all(&mhi_cntrl->state_event);
+
+ /* For fatal errors, we let controller decide next step */
+ if (MHI_IN_PBL(ee))
+ mhi_cntrl->status_cb(mhi_cntrl, mhi_cntrl->priv_data,
+ MHI_CB_FATAL_ERROR);
+ else
+ schedule_work(&mhi_cntrl->syserr_worker);
+ }
+
+exit_intvec:
+
+ return IRQ_HANDLED;
+}
+
+irqreturn_t mhi_intvec_handler(int irq_number, void *dev)
+{
+ struct mhi_controller *mhi_cntrl = dev;
+
+ /* Wake up events waiting for state change */
+ wake_up_all(&mhi_cntrl->state_event);
+
+ return IRQ_WAKE_THREAD;
+}