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iommu/arm-smmu: Clear cache lock bit of ACR 

According MMU-500r2 TRM, section 3.7.1 Auxiliary Control registers,
You can modify ACTLR only when the ACR.CACHE_LOCK bit is 0.

So before clearing ARM_MMU500_ACTLR_CPRE of each context bank,
need clear CACHE_LOCK bit of ACR register first.

Since CACHE_LOCK bit is only present in MMU-500r2 onwards,
need to check the major number of IDR7.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Peng Fan <van.freenix@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Peng Fan 2016-05-03 21:50:30 +08:00 committed by Will Deacon
parent b7862e3559
commit 3ca3712a42
1 changed files with 22 additions and 1 deletions
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23
drivers/iommu/arm-smmu.c
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@ -98,6 +98,9 @@
#define sCR0_BSU_SHIFT 14
#define sCR0_BSU_MASK 0x3
/* Auxiliary Configuration register */
#define ARM_SMMU_GR0_sACR 0x10
/* Identification registers */
#define ARM_SMMU_GR0_ID0 0x20
#define ARM_SMMU_GR0_ID1 0x24
@ -146,6 +149,9 @@
#define ID2_PTFS_64K (1 << 14)
#define ID2_VMID16 (1 << 15)
#define ID7_MAJOR_SHIFT 4
#define ID7_MAJOR_MASK 0xf
/* Global TLB invalidation */
#define ARM_SMMU_GR0_TLBIVMID 0x64
#define ARM_SMMU_GR0_TLBIALLNSNH 0x68
@ -237,6 +243,8 @@
#define ARM_MMU500_ACTLR_CPRE (1 << 1)
#define ARM_MMU500_ACR_CACHE_LOCK (1 << 26)
#define CB_PAR_F (1 << 0)
#define ATSR_ACTIVE (1 << 0)
@ -1531,7 +1539,7 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
void __iomem *cb_base;
int i = 0;
u32 reg;
u32 reg, major;
/* clear global FSR */
reg = readl_relaxed(ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sGFSR);
@ -1544,6 +1552,19 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_S2CR(i));
}
/*
* Before clearing ARM_MMU500_ACTLR_CPRE, need to
* clear CACHE_LOCK bit of ACR first. And, CACHE_LOCK
* bit is only present in MMU-500r2 onwards.
*/
reg = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID7);
major = (reg >> ID7_MAJOR_SHIFT) & ID7_MAJOR_MASK;
if ((smmu->model == ARM_MMU500) && (major >= 2)) {
reg = readl_relaxed(gr0_base + ARM_SMMU_GR0_sACR);
reg &= ~ARM_MMU500_ACR_CACHE_LOCK;
writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_sACR);
}
/* Make sure all context banks are disabled and clear CB_FSR */
for (i = 0; i < smmu->num_context_banks; ++i) {
cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, i);