From 66ac7985b2af310aaca14869d6e43b0290e98c07 Mon Sep 17 00:00:00 2001 From: Carl Yin Date: Mon, 29 Mar 2021 18:28:21 -0700 Subject: bus: mhi: core: Add support for Flash Programmer execution environment MHI WWAN modems support downloading firmware to NAND or eMMC using Firehose protocol with process as follows: 1. Modem boots up, enters AMSS execution environment and the device later enters EDL (Emergency Download) mode through any mechanism host can use such as a diag command. 2. Modem enters SYS_ERROR, MHI host handles SYS_ERROR transition. 3. EDL image for device to enter 'Flash Programmer' execution environment is then flashed via BHI interface from host. 4. Modem enters MHI READY -> M0 and sends the Flash Programmer execution environment change to host. 5. Following that, EDL/FIREHOSE channels (34, 35) are made available from the host. 6. User space tool for downloading firmware image to modem over the EDL channels using Firehose protocol. Link to USB flashing tool: https://git.linaro.org/landing-teams/working/qualcomm/qdl.git/ Make the necessary changes to allow for this sequence to occur and allow using the Flash Programmer execution environment. Signed-off-by: Carl Yin Co-developed-by: Bhaumik Bhatt Signed-off-by: Bhaumik Bhatt Reviewed-by: Loic Poulain Reviewed-by: Manivannan Sadhasivam Link: https://lore.kernel.org/r/1617067704-28850-5-git-send-email-bbhatt@codeaurora.org Signed-off-by: Manivannan Sadhasivam --- drivers/bus/mhi/core/init.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/bus/mhi/core/init.c') diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index 706484ffe169..ee67712f66c0 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -29,6 +29,7 @@ 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] = "FLASH PROGRAMMER", [MHI_EE_DISABLE_TRANSITION] = "DISABLE", [MHI_EE_NOT_SUPPORTED] = "NOT SUPPORTED", }; @@ -38,6 +39,7 @@ 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] = "FLASH_PROGRAMMER", [DEV_ST_TRANSITION_SYS_ERR] = "SYS_ERR", [DEV_ST_TRANSITION_DISABLE] = "DISABLE", }; -- cgit v1.2.3