diff options
| author | Toshifumi NISHINAGA <tnishinaga.dev@gmail.com> | 2016-07-08 01:02:25 +0900 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-07-14 18:22:43 -0400 |
| commit | 25c1b1353ce4b8188de6058f9f3b0d5d2dad8230 (patch) | |
| tree | f66f1e30d68da2c106436240b04da728a5ac13a7 /arch/arm/mach-stm32 | |
| parent | ba0a3c16e0c6697f0254644cc7a9849b77000eb8 (diff) | |
stm32: Add SDRAM support for stm32f746 discovery board
This patch adds SDRAM support for stm32f746 discovery board.
This patch depends on previous patch.
This patch is based on STM32F4 and emcraft's[1].
[1]: https://github.com/EmcraftSystems/u-boot
Signed-off-by: Toshifumi NISHINAGA <tnishinaga.dev@gmail.com>
Diffstat (limited to 'arch/arm/mach-stm32')
| -rw-r--r-- | arch/arm/mach-stm32/stm32f7/soc.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm/mach-stm32/stm32f7/soc.c b/arch/arm/mach-stm32/stm32f7/soc.c index 6a1e019433..8baee99a4f 100644 --- a/arch/arm/mach-stm32/stm32f7/soc.c +++ b/arch/arm/mach-stm32/stm32f7/soc.c @@ -19,6 +19,55 @@ int arch_cpu_init(void) { configure_clocks(); + /* + * Configure the memory protection unit (MPU) + * 0x00000000 - 0xffffffff: Strong-order, Shareable + * 0xC0000000 - 0xC0800000: Normal, Outer and inner Non-cacheable + */ + + /* Disable MPU */ + writel(0, &V7M_MPU->ctrl); + + writel( + 0x00000000 /* address */ + | 1 << 4 /* VALID */ + | 0 << 0 /* REGION */ + , &V7M_MPU->rbar + ); + + /* Strong-order, Shareable */ + /* TEX=000, S=1, C=0, B=0*/ + writel( + (V7M_MPU_RASR_XN_ENABLE + | V7M_MPU_RASR_AP_RW_RW + | 0x01 << V7M_MPU_RASR_S_SHIFT + | 0x00 << V7M_MPU_RASR_TEX_SHIFT + | V7M_MPU_RASR_SIZE_4GB + | V7M_MPU_RASR_EN) + , &V7M_MPU->rasr + ); + + writel( + 0xC0000000 /* address */ + | 1 << 4 /* VALID */ + | 1 << 0 /* REGION */ + , &V7M_MPU->rbar + ); + + /* Normal, Outer and inner Non-cacheable */ + /* TEX=001, S=0, C=0, B=0*/ + writel( + (V7M_MPU_RASR_XN_ENABLE + | V7M_MPU_RASR_AP_RW_RW + | 0x01 << V7M_MPU_RASR_TEX_SHIFT + | V7M_MPU_RASR_SIZE_8MB + | V7M_MPU_RASR_EN) + , &V7M_MPU->rasr + ); + + /* Enable MPU */ + writel(V7M_MPU_CTRL_ENABLE | V7M_MPU_CTRL_HFNMIENA, &V7M_MPU->ctrl); + return 0; } |