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iommu/arm-smmu: Add reset implementation hook

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Reset is an activity rife with implementation-defined poking. Add a
corresponding hook, and use it to encapsulate the existing MMU-500
details.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Robin Murphy
2019-08-15 19:37:36 +01:00
committed by Will Deacon
parent 3995e18689
commit 62b993a36e
3 changed files with 54 additions and 35 deletions
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49
drivers/iommu/arm-smmu-impl.c
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@@ -4,6 +4,7 @@
#define pr_fmt(fmt) "arm-smmu: " fmt
#include <linux/bitfield.h>
#include <linux/of.h>
#include "arm-smmu.h"
@@ -67,6 +68,51 @@ const struct arm_smmu_impl cavium_impl = {
};
#define ARM_MMU500_ACTLR_CPRE (1 << 1)
#define ARM_MMU500_ACR_CACHE_LOCK (1 << 26)
#define ARM_MMU500_ACR_S2CRB_TLBEN (1 << 10)
#define ARM_MMU500_ACR_SMTNMB_TLBEN (1 << 8)
static int arm_mmu500_reset(struct arm_smmu_device *smmu)
{
u32 reg, major;
int i;
/*
* On MMU-500 r2p0 onwards we need to clear ACR.CACHE_LOCK before
* writes to the context bank ACTLRs will stick. And we just hope that
* Secure has also cleared SACR.CACHE_LOCK for this to take effect...
*/
reg = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_ID7);
major = FIELD_GET(ID7_MAJOR, reg);
reg = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_sACR);
if (major >= 2)
reg &= ~ARM_MMU500_ACR_CACHE_LOCK;
/*
* Allow unmatched Stream IDs to allocate bypass
* TLB entries for reduced latency.
*/
reg |= ARM_MMU500_ACR_SMTNMB_TLBEN | ARM_MMU500_ACR_S2CRB_TLBEN;
arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_sACR, reg);
/*
* Disable MMU-500's not-particularly-beneficial next-page
* prefetcher for the sake of errata #841119 and #826419.
*/
for (i = 0; i < smmu->num_context_banks; ++i) {
reg = arm_smmu_cb_read(smmu, i, ARM_SMMU_CB_ACTLR);
reg &= ~ARM_MMU500_ACTLR_CPRE;
arm_smmu_cb_write(smmu, i, ARM_SMMU_CB_ACTLR, reg);
}
return 0;
}
const struct arm_smmu_impl arm_mmu500_impl = {
.reset = arm_mmu500_reset,
};
struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
{
/*
@@ -76,6 +122,9 @@ struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
* mutually-exclusive assignments.
*/
switch (smmu->model) {
case ARM_MMU500:
smmu->impl = &arm_mmu500_impl;
break;
case CAVIUM_SMMUV2:
smmu->impl = &cavium_impl;
break;