[U-Boot] [PATCH V2 02/10] imx8: scu: use dedicated MU for SPL

Peng Fan
2018-12-21T06:21:15Z

SPL runs in EL3 mode, except MU0_A, others are not powered on,
and could not be used. However normal U-Boot use MU1_A, so we
could not reuse the one in dts. And we could not replace the one
in dts with MU0_A, because MU0_A is reserved in secure world.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
arch/arm/mach-imx/imx8/Kconfig | 7 +++++++
drivers/misc/imx8/scu.c | 4 ++++
2 files changed, 11 insertions(+)

diff --git a/arch/arm/mach-imx/imx8/Kconfig b/arch/arm/mach-imx/imx8/Kconfig
index 9671107cb6..f76a139684 100644
--- a/arch/arm/mach-imx/imx8/Kconfig
+++ b/arch/arm/mach-imx/imx8/Kconfig
@@ -3,6 +3,13 @@ if ARCH_IMX8
config IMX8
bool

+config MU_BASE_SPL
+ hex "MU base address used in SPL"
+ default 0x5d1b0000
+ help
+ SPL runs in EL3 mode, it use MU0_A to communicate with SCU.
+ So we could not reuse the one in dts which is for normal U-Boot.
+
config IMX8QXP
select IMX8
select SUPPORT_SPL
diff --git a/drivers/misc/imx8/scu.c b/drivers/misc/imx8/scu.c
index 15101b3e5f..1b9c49c99c 100644
--- a/drivers/misc/imx8/scu.c
+++ b/drivers/misc/imx8/scu.c
@@ -191,7 +191,11 @@ static int imx8_scu_probe(struct udevice *dev)
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;

+#ifdef CONFIG_SPL_BUILD
+ plat->base = (struct mu_type *)CONFIG_MU_BASE_SPL;
+#else
plat->base = (struct mu_type *)addr;
+#endif

/* U-Boot not enable interrupts, so need to enable RX interrupts */
mu_hal_init(plat->base);
--
2.14.1