ENGR00322860 iMX6SX: Add function to check M4 status before booting

Add new function "arch_auxiliary_core_check_up" to check whether M4
is already up. Therefore, avoid starting M4 again when it is running.

Signed-off-by: Ye.Li <B37916@freescale.com>
(cherry picked from commit 54a0803b29c5ab459bedfb2c68c1e94b89866aa1)

3 files changed, 31 insertions, 1 deletions

diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index 001b9ab..e4393b3 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -628,6 +628,19 @@ int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
 
 	return 0;
 }
+
+int arch_auxiliary_core_check_up(u32 core_id)
+{
+	struct src *src_reg = (struct src *)SRC_BASE_ADDR;
+	unsigned val;
+
+	val = readl(&src_reg->scr);
+
+	if (val & 0x00000010)
+		return 0;  /* assert in reset */
+
+	return 1;
+}
 #endif
 
 void boot_mode_apply(unsigned cfg_val)
diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h b/arch/arm/include/asm/arch-mx6/sys_proto.h
index df7a0a2..f358c36 100644
--- a/arch/arm/include/asm/arch-mx6/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx6/sys_proto.h
@@ -32,6 +32,7 @@ void ldo_mode_set(int ldo_bypass);
 
 #ifdef CONFIG_MX6SX
 int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data);
+int arch_auxiliary_core_check_up(u32 core_id);
 #endif
 
 /*
diff --git a/common/cmd_bootaux.c b/common/cmd_bootaux.c
index 188cb73..b15de0e 100644
--- a/common/cmd_bootaux.c
+++ b/common/cmd_bootaux.c
@@ -16,14 +16,30 @@ static int __arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
 int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
 	__attribute__((weak, alias("__arch_auxiliary_core_up")));
 
+/* Allow for arch specific config before we boot */
+static int __arch_auxiliary_core_check_up(u32 core_id)
+{
+	/* please define platform specific arch_auxiliary_core_check_up() */
+	return 0;
+}
+
+int arch_auxiliary_core_check_up(u32 core_id)
+	__attribute__((weak, alias("__arch_auxiliary_core_check_up")));
+
 int do_bootaux(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	ulong addr;
-	int ret;
+	int ret, up;
 
 	if (argc < 2)
 		return CMD_RET_USAGE;
 
+	up = arch_auxiliary_core_check_up(0);
+	if (up) {
+		printf("## Auxiliary core is already up\n");
+		return CMD_RET_SUCCESS;
+	}
+
 	addr = simple_strtoul(argv[1], NULL, 16);
 
 	printf("## Starting auxiliary core at 0x%08lX ...\n", addr);