Tegra: memctrl_v1: disable AHB redirection after cold boot
During boot, USB3 and flash media (SDMMC/SATA) devices need access to
IRAM. Because these clients connect to the MC and do not have a direct
path to the IRAM, the MC implements AHB redirection during boot to allow
path to IRAM. In this mode, accesses to a programmed memory address aperture
are directed to the AHB bus, allowing access to the IRAM. The AHB aperture
is defined by the IRAM_BASE_LO and IRAM_BASE_HI registers, which are
initialized to disable this aperture. Once bootup is complete, we must
program IRAM base/top, thus disabling access to IRAM.
This patch provides functionality to disable this access. The tegra port
calls this new function before jumping to the non-secure world during
cold boot.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/plat/nvidia/tegra/include/drivers/memctrl_v1.h b/plat/nvidia/tegra/include/drivers/memctrl_v1.h
index b504594..8b8ce79 100644
--- a/plat/nvidia/tegra/include/drivers/memctrl_v1.h
+++ b/plat/nvidia/tegra/include/drivers/memctrl_v1.h
@@ -60,6 +60,13 @@
#define MC_SMMU_TRANSLATION_ENABLE_4_0 0xb98
#define MC_SMMU_TRANSLATION_ENABLE (~0)
+/* MC IRAM aperture registers */
+#define MC_IRAM_BASE_LO 0x65CU
+#define MC_IRAM_TOP_LO 0x660U
+#define MC_IRAM_BASE_TOP_HI 0x980U
+#define MC_IRAM_REG_CTRL 0x964U
+#define MC_DISABLE_IRAM_CFG_WRITES 1U
+
static inline uint32_t tegra_mc_read_32(uint32_t off)
{
return mmio_read_32(TEGRA_MC_BASE + off);