From: "carl.yin" <carl.yin@xxxxxxxxxxx>
MHI wwan modems support download firmware to nand or emmc
by firehose protocol, process as next:
1. wwan modem normal bootup and enter EE AMSS, create mhi DIAG chan device
2. send EDL cmd via DIAG chan, then modem enter EE EDL
3. boot.c download 'firehose/prog_firehose_sdx55.mbn' via BHI interface
4. modem enter EE FP, and create mhi EDL chan device
5. user space tool download FW to modem via EDL chan by firehose protocol
Signed-off-by: carl.yin <carl.yin@xxxxxxxxxxx>
---
drivers/bus/mhi/core/boot.c | 4 +++-
drivers/bus/mhi/core/init.c | 2 ++
drivers/bus/mhi/core/internal.h | 1 +
drivers/bus/mhi/core/main.c | 3 +++
drivers/bus/mhi/core/pm.c | 16 +++++++++++++++-
include/linux/mhi.h | 4 +++-
6 files changed, 27 insertions(+), 3 deletions(-)
diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
index 24422f5..ab39ad6 100644
--- a/drivers/bus/mhi/core/boot.c
+++ b/drivers/bus/mhi/core/boot.c
@@ -460,8 +460,10 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
return;
}
- if (mhi_cntrl->ee == MHI_EE_EDL)
+ if (mhi_cntrl->ee == MHI_EE_EDL) {
+ mhi_ready_state_transition(mhi_cntrl);
return;
+ }
write_lock_irq(&mhi_cntrl->pm_lock);
mhi_cntrl->dev_state = MHI_STATE_RESET;
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index ac4aa5c..9c2c2f3 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -26,6 +26,7 @@ const char * const mhi_ee_str[MHI_EE_MAX] = {
[MHI_EE_WFW] = "WFW",
[MHI_EE_PTHRU] = "PASS THRU",
[MHI_EE_EDL] = "EDL",
+ [MHI_EE_FP] = "FP",
[MHI_EE_DISABLE_TRANSITION] = "DISABLE",
[MHI_EE_NOT_SUPPORTED] = "NOT SUPPORTED",
};
@@ -35,6 +36,7 @@ const char * const dev_state_tran_str[DEV_ST_TRANSITION_MAX] = {
[DEV_ST_TRANSITION_READY] = "READY",
[DEV_ST_TRANSITION_SBL] = "SBL",
[DEV_ST_TRANSITION_MISSION_MODE] = "MISSION_MODE",
+ [DEV_ST_TRANSITION_FP] = "FP",
[DEV_ST_TRANSITION_SYS_ERR] = "SYS_ERR",
[DEV_ST_TRANSITION_DISABLE] = "DISABLE",
};
diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index 4abf0cf..6ae897a 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -386,6 +386,7 @@ enum dev_st_transition {
DEV_ST_TRANSITION_READY,
DEV_ST_TRANSITION_SBL,
DEV_ST_TRANSITION_MISSION_MODE,
+ DEV_ST_TRANSITION_FP,
DEV_ST_TRANSITION_SYS_ERR,
DEV_ST_TRANSITION_DISABLE,
DEV_ST_TRANSITION_MAX,
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index 3950792..e307b58 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -782,6 +782,9 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl,
case MHI_EE_SBL:
st = DEV_ST_TRANSITION_SBL;
break;
+ case MHI_EE_FP:
+ st = DEV_ST_TRANSITION_FP;
+ break;
case MHI_EE_WFW:
case MHI_EE_AMSS:
st = DEV_ST_TRANSITION_MISSION_MODE;
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 3de7b16..3c95a5d 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -563,7 +563,15 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl,
}
if (cur_state == MHI_PM_SYS_ERR_PROCESS) {
- mhi_ready_state_transition(mhi_cntrl);
+ if (mhi_get_exec_env(mhi_cntrl) == MHI_EE_EDL
+ && mhi_get_mhi_state(mhi_cntrl) == MHI_STATE_RESET) {
+ write_lock_irq(&mhi_cntrl->pm_lock);
+ cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_POR);
+ write_unlock_irq(&mhi_cntrl->pm_lock);
+ mhi_queue_state_transition(mhi_cntrl, DEV_ST_TRANSITION_PBL);
+ } else {
+ mhi_ready_state_transition(mhi_cntrl);
+ }
} else {
/* Move to disable state */
write_lock_irq(&mhi_cntrl->pm_lock);
@@ -658,6 +666,12 @@ void mhi_pm_st_worker(struct work_struct *work)
case DEV_ST_TRANSITION_MISSION_MODE:
mhi_pm_mission_mode_transition(mhi_cntrl);
break;
+ case DEV_ST_TRANSITION_FP:
+ write_lock_irq(&mhi_cntrl->pm_lock);
+ mhi_cntrl->ee = MHI_EE_FP;
+ write_unlock_irq(&mhi_cntrl->pm_lock);
+ mhi_create_devices(mhi_cntrl);
+ break;
case DEV_ST_TRANSITION_READY:
mhi_ready_state_transition(mhi_cntrl);
break;
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index 6e1122c..4620af8 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -120,6 +120,7 @@ struct mhi_link_info {
* @MHI_EE_WFW: WLAN firmware mode
* @MHI_EE_PTHRU: Passthrough
* @MHI_EE_EDL: Embedded downloader
+ * @MHI_EE_FP, Flash Programmer Environment
*/
enum mhi_ee_type {
MHI_EE_PBL,
@@ -129,7 +130,8 @@ enum mhi_ee_type {
MHI_EE_WFW,
MHI_EE_PTHRU,
MHI_EE_EDL,
- MHI_EE_MAX_SUPPORTED = MHI_EE_EDL,
+ MHI_EE_FP,
+ MHI_EE_MAX_SUPPORTED = MHI_EE_FP,
MHI_EE_DISABLE_TRANSITION, /* local EE, not related to mhi spec */
MHI_EE_NOT_SUPPORTED,
MHI_EE_MAX,
--
2.25.1
