H3's CCU includes some switches which disable non-secure access to some
of the more critical clock controls, such as MBUS, PLLs, and main
platform busses.
Configure them to enable non-secure access.
For now the only SoC that has this feature is the H3. For other
platforms just use a default (weak) empty function so things do
not break.
Signed-off-by: Chen-Yu Tsai <w...@csie.org>
---
arch/arm/cpu/armv7/sunxi/clock.c | 5 +++++
arch/arm/cpu/armv7/sunxi/clock_sun6i.c | 13 +++++++++++++
arch/arm/include/asm/arch-sunxi/clock.h | 1 +
arch/arm/include/asm/arch-sunxi/clock_sun6i.h | 7 +++++++
4 files changed, 26 insertions(+)
diff --git a/arch/arm/cpu/armv7/sunxi/clock.c b/arch/arm/cpu/armv7/sunxi/clock.c
index 47fb70f..5cc5d25 100644
--- a/arch/arm/cpu/armv7/sunxi/clock.c
+++ b/arch/arm/cpu/armv7/sunxi/clock.c
@@ -14,12 +14,17 @@
#include <asm/arch/gpio.h>
#include <asm/arch/sys_proto.h>
+__weak void clock_init_sec(void)
+{
+}
+
int clock_init(void)
{
#ifdef CONFIG_SPL_BUILD
clock_init_safe();
#endif
clock_init_uart();
+ clock_init_sec();
return 0;
}
diff --git a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
index 4501884..d0085e8 100644
--- a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
+++ b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
@@ -45,6 +45,19 @@ void clock_init_safe(void)
}
#endif
+void clock_init_sec(void)
+{
+ struct sunxi_ccm_reg * const ccm =
+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+
+#ifdef CONFIG_MACH_SUN8I_H3
+ setbits_le32(&ccm->ccu_sec_switch,
+ CCM_SEC_SWITCH_MBUS_NONSEC |
+ CCM_SEC_SWITCH_BUS_NONSEC |
+ CCM_SEC_SWITCH_PLL_NONSEC);
+#endif
+}
+
void clock_init_uart(void)
{
#if CONFIG_CONS_INDEX < 5
diff --git a/arch/arm/include/asm/arch-sunxi/clock.h
b/arch/arm/include/asm/arch-sunxi/clock.h
index 8ca58ae..6c0573f 100644
--- a/arch/arm/include/asm/arch-sunxi/clock.h
+++ b/arch/arm/include/asm/arch-sunxi/clock.h
@@ -30,6 +30,7 @@ int clock_init(void);
int clock_twi_onoff(int port, int state);
void clock_set_de_mod_clock(u32 *clk_cfg, unsigned int hz);
void clock_init_safe(void);
+void clock_init_sec(void);
void clock_init_uart(void);
#endif
diff --git a/arch/arm/include/asm/arch-sunxi/clock_sun6i.h
b/arch/arm/include/asm/arch-sunxi/clock_sun6i.h
index 5c76275..554d858 100644
--- a/arch/arm/include/asm/arch-sunxi/clock_sun6i.h
+++ b/arch/arm/include/asm/arch-sunxi/clock_sun6i.h
@@ -137,6 +137,8 @@ struct sunxi_ccm_reg {
u32 apb1_reset_cfg; /* 0x2d0 APB1 Reset config */
u32 reserved24;
u32 apb2_reset_cfg; /* 0x2d8 APB2 Reset config */
+ u32 reserved25[5];
+ u32 ccu_sec_switch; /* 0x2f0 CCU Security Switch, H3 only */
};
/* apb2 bit field */
@@ -375,6 +377,11 @@ struct sunxi_ccm_reg {
#define CCM_DE_CTRL_PLL10 (5 << 24)
#define CCM_DE_CTRL_GATE (1 << 31)
+/* CCU security switch, H3 only */
+#define CCM_SEC_SWITCH_MBUS_NONSEC (1 << 2)
+#define CCM_SEC_SWITCH_BUS_NONSEC (1 << 1)
+#define CCM_SEC_SWITCH_PLL_NONSEC (1 << 0)
+
#ifndef __ASSEMBLY__
void clock_set_pll1(unsigned int hz);
void clock_set_pll3(unsigned int hz);
--
2.6.4
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