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| author | Chen-Yu Tsai <wens@csie.org> | 2015-08-25 10:49:19 +0800 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2015-08-31 08:43:42 +0200 |
| commit | 92369844ec7bf0e63de51e19b281fe3739e01397 (patch) | |
| tree | add7a1f64102a55f53b06877c2fb9f547e045bc6 /arch/arm/cpu/armv7/sunxi | |
| parent | 3537a0e8caa33ad4af354d5efc6be117b0728856 (diff) | |
| download | blackbird-obmc-uboot-92369844ec7bf0e63de51e19b281fe3739e01397.tar.gz blackbird-obmc-uboot-92369844ec7bf0e63de51e19b281fe3739e01397.zip | |
sunxi: Enable non-secure access to RTC on sun6i (A31s)
On the A31s the RTC is by default secured. Thus when u-boot
loads the kernel in non-secure world, the RTC is unavailable. The
SoC has a TrustZone Protection Controller, which can be used to
enable non-secure access to the RTC.
On the A31 the TZPC doesn't seem to do anything, i.e. changes to
its register contents do not affect access to the RTC.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'arch/arm/cpu/armv7/sunxi')
| -rw-r--r-- | arch/arm/cpu/armv7/sunxi/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/sunxi/board.c | 5 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/sunxi/tzpc.c | 18 |
3 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/sunxi/Makefile b/arch/arm/cpu/armv7/sunxi/Makefile index 76c7e555f1..459d5d8b0c 100644 --- a/arch/arm/cpu/armv7/sunxi/Makefile +++ b/arch/arm/cpu/armv7/sunxi/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_MACH_SUN6I) += clock_sun6i.o obj-$(CONFIG_MACH_SUN7I) += clock_sun4i.o obj-$(CONFIG_MACH_SUN8I) += clock_sun6i.o obj-$(CONFIG_MACH_SUN9I) += clock_sun9i.o +obj-$(CONFIG_MACH_SUN6I) += tzpc.o obj-$(CONFIG_AXP152_POWER) += pmic_bus.o obj-$(CONFIG_AXP209_POWER) += pmic_bus.o diff --git a/arch/arm/cpu/armv7/sunxi/board.c b/arch/arm/cpu/armv7/sunxi/board.c index f01846ef9a..b40198b36e 100644 --- a/arch/arm/cpu/armv7/sunxi/board.c +++ b/arch/arm/cpu/armv7/sunxi/board.c @@ -23,6 +23,7 @@ #include <asm/arch/gpio.h> #include <asm/arch/sys_proto.h> #include <asm/arch/timer.h> +#include <asm/arch/tzpc.h> #include <asm/arch/mmc.h> #include <linux/compiler.h> @@ -115,6 +116,10 @@ void s_init(void) "orr r0, r0, #1 << 6\n" "mcr p15, 0, r0, c1, c0, 1\n"); #endif +#if defined CONFIG_MACH_SUN6I + /* Enable non-secure access to the RTC */ + tzpc_init(); +#endif clock_init(); timer_init(); diff --git a/arch/arm/cpu/armv7/sunxi/tzpc.c b/arch/arm/cpu/armv7/sunxi/tzpc.c new file mode 100644 index 0000000000..5c9c69b20b --- /dev/null +++ b/arch/arm/cpu/armv7/sunxi/tzpc.c @@ -0,0 +1,18 @@ +/* + * (C) Copyright 2015 Chen-Yu Tsai <wens@csie.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <asm/io.h> +#include <asm/arch/cpu.h> +#include <asm/arch/tzpc.h> + +/* Configure Trust Zone Protection Controller */ +void tzpc_init(void) +{ + struct sunxi_tzpc *tzpc = (struct sunxi_tzpc *)SUNXI_TZPC_BASE; + + /* Enable non-secure access to the RTC */ + writel(SUNXI_TZPC_DECPORT0_RTC, &tzpc->decport0_set); +} |
