[PATCH v2 12/16] arm: mach-k3: j722s: Enable LPM resume flow

[Richard Genoud (TI)]

Add support for resuming from suspend in board_init_f for J722S.
The resume state of the SOC is identified and lpm resume
sequence is followed accordingly:

- Extract context address from devicetree and send to TIFS.
- Power on the rproc cluster.
- Replay the certificates attached to saved images of ATF and OPTEE.
- Resume sequence for context restore and rproc resume.
- Image entry to DM firmware.

The context address area is firewalled by TIFS to protect it from
other hosts.

Signed-off-by: Richard Genoud (TI) <richard.genoud at bootlin.com>
---
 arch/arm/mach-k3/j722s/j722s_init.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-k3/j722s/j722s_init.c b/arch/arm/mach-k3/j722s/j722s_init.c
index 1180c75f551d..e687bcb354c9 100644
--- a/arch/arm/mach-k3/j722s/j722s_init.c
+++ b/arch/arm/mach-k3/j722s/j722s_init.c
@@ -14,6 +14,7 @@
 
 #include "../sysfw-loader.h"
 #include "../common.h"
+#include "../lpm-common.h"
 
 struct fwl_data cbass_main_fwls[] = {
 	{ "FSS_DAT_REG3", 7, 8 },
@@ -37,7 +38,7 @@ static void store_boot_info_from_rom(void)
 	       sizeof(struct rom_extended_boot_data));
 }
 
-static void ctrl_mmr_unlock(void)
+void ctrl_mmr_unlock(void)
 {
 	/* Unlock all WKUP_CTRL_MMR0 module registers */
 	mmr_unlock(WKUP_CTRL_MMR0_BASE, 0);
@@ -156,6 +157,11 @@ static void k3_spl_init(void)
 		k3_dm_print_ver();
 }
 
+__weak bool j7xx_board_is_resuming(void)
+{
+	return false;
+}
+
 static void k3_mem_init(void)
 {
 	struct udevice *dev;
@@ -186,6 +192,9 @@ void board_init_f(ulong dummy)
 
 	k3_spl_init();
 	k3_mem_init();
+	if (j7xx_board_is_resuming())
+		do_resume(); /* no return */
+
 	setup_qos();
 
 	if (IS_ENABLED(CONFIG_ESM_K3)) {
-- 
2.47.3