From 79cf644e2d330cf6fdd3ef489e44f9fb1c6f196a Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Tue, 21 Apr 2015 07:18:38 +0200 Subject: ARM: tegra: Enable SMMU when going non-secure Make sure to enable the SMMU when booting the kernel in non-secure mode. This is necessary because some of the SMMU registers are restricted to TrustZone-secured requestors, hence the kernel wouldn't be able to turn the SMMU on. At the same time, enable translation for all memory clients for the same reasons. The kernel will still be able to control SMMU IOVA translation using the per-SWGROUP enable bits. Signed-off-by: Thierry Reding Signed-off-by: Jan Kiszka Signed-off-by: Tom Warren --- arch/arm/mach-tegra/ap.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) (limited to 'arch/arm/mach-tegra') diff --git a/arch/arm/mach-tegra/ap.c b/arch/arm/mach-tegra/ap.c index 869a2ed6bc..0b94e8aaf9 100644 --- a/arch/arm/mach-tegra/ap.c +++ b/arch/arm/mach-tegra/ap.c @@ -169,6 +169,43 @@ void protect_secure_section(void) } #endif +#if defined(CONFIG_ARMV7_NONSEC) +static void smmu_flush(struct mc_ctlr *mc) +{ + (void)readl(&mc->mc_smmu_config); +} + +static void smmu_enable(void) +{ + struct mc_ctlr *mc = (struct mc_ctlr *)NV_PA_MC_BASE; + u32 value; + + /* + * Enable translation for all clients since access to this register + * is restricted to TrustZone-secured requestors. The kernel will use + * the per-SWGROUP enable bits to enable or disable translations. + */ + writel(0xffffffff, &mc->mc_smmu_translation_enable_0); + writel(0xffffffff, &mc->mc_smmu_translation_enable_1); + writel(0xffffffff, &mc->mc_smmu_translation_enable_2); + writel(0xffffffff, &mc->mc_smmu_translation_enable_3); + + /* + * Enable SMMU globally since access to this register is restricted + * to TrustZone-secured requestors. + */ + value = readl(&mc->mc_smmu_config); + value |= TEGRA_MC_SMMU_CONFIG_ENABLE; + writel(value, &mc->mc_smmu_config); + + smmu_flush(mc); +} +#else +static void smmu_enable(void) +{ +} +#endif + void s_init(void) { /* Init PMC scratch memory */ @@ -179,6 +216,9 @@ void s_init(void) /* init the cache */ config_cache(); + /* enable SMMU */ + smmu_enable(); + /* init vpr */ config_vpr(); } -- cgit v1.2.1