MLK-11488-9 arm: imx: add A9-M4 clk shared management

As A9 and M4 share many resources on i.MX6SX, especially for
clk and power related resource, so we need to handle the hardware
conflict between these two cores, there are two cases that we
need to consider currently:

clk management: for every clk node, only when both A9 and
M4 do NOT need it, then we can disable it from hardware;

Here we use MU and hardware SEMA4 to achieve our goal, MU is
for communiation between A9 and M4, SEMA4 is to protect the
shared memory.

For clk management, we use shared memory to maintain the clk
status for both A9 and M4 side, and this shared memory is
protected by hardware SEMA4, A9 and M4 will maintain their
own clk tree info in their SW environment, and get other
CORE's clk tree info from shared memory to decide whether
to perform a hardware setting change when they plan to.

Signed-off-by: Anson Huang <b20788@freescale.com>

Also made SOC_IMX6SX select IMX_SEMA4 as part of this commit to fix
build failures.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>

2 files changed, 13 insertions, 0 deletions

diff --git a/include/soc/imx/gpc.h b/include/soc/imx/gpc.h
new file mode 100644
index 000000000000..6a976e6aa3fe
--- /dev/null
+++ b/include/soc/imx/gpc.h
@@ -0,0 +1,7 @@
+#ifndef __SOC_IMX_GPC_H
+#define __SOC_IMX_GPC_H
+
+void imx_gpc_hold_m4_in_sleep(void);
+void imx_gpc_release_m4_in_sleep(void);
+
+#endif /* __SOC_IMX_GPC_H */
diff --git a/include/soc/imx/src.h b/include/soc/imx/src.h
new file mode 100644
index 000000000000..c55c34cd2366
--- /dev/null
+++ b/include/soc/imx/src.h
@@ -0,0 +1,6 @@
+#ifndef __SOC_IMX_SRC_H
+#define __SOC_IMX_SRC_H
+
+bool imx_src_is_m4_enabled(void);
+
+#endif /* __SOC_IMX_SRC_H */