mpc85xx/t104x: Add deep sleep framework support
When T104x soc wakes up from deep sleep, control is passed to the
primary core that starts executing uboot. After re-initialized some
IP blocks, like DDRC, kernel will take responsibility to continue
to restore environment it leaves before.
Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/arch/powerpc/lib/board.c b/arch/powerpc/lib/board.c
index f86c6f3..8b03d3a 100644
--- a/arch/powerpc/lib/board.c
+++ b/arch/powerpc/lib/board.c
@@ -343,6 +343,13 @@
#ifdef CONFIG_PRAM
ulong reg;
#endif
+#ifdef CONFIG_DEEP_SLEEP
+ const ccsr_gur_t *gur = (void __iomem *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+ struct ccsr_scfg *scfg = (void *)CONFIG_SYS_MPC85xx_SCFG;
+ u32 start_addr;
+ typedef void (*func_t)(void);
+ func_t kernel_resume;
+#endif
/* Pointer is writable since we allocated a register for it */
gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
@@ -360,6 +367,15 @@
if ((*init_fnc_ptr) () != 0)
hang();
+#ifdef CONFIG_DEEP_SLEEP
+ /* Jump to kernel in deep sleep case */
+ if (in_be32(&gur->scrtsr[0]) & (1 << 3)) {
+ start_addr = in_be32(&scfg->sparecr[1]);
+ kernel_resume = (func_t)start_addr;
+ kernel_resume();
+ }
+#endif
+
#ifdef CONFIG_POST
post_bootmode_init();
post_run(NULL, POST_ROM | post_bootmode_get(NULL));