[PATCH 14/15] iommu/arm-smmu: Add reset implementation hook

[Robin Murphy <robin.murphy@arm.com>]

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>
---
 drivers/iommu/arm-smmu-impl.c | 49 +++++++++++++++++++++++++++++++++++
 drivers/iommu/arm-smmu.c      | 39 +++-------------------------
 drivers/iommu/arm-smmu.h      |  1 +
 3 files changed, 54 insertions(+), 35 deletions(-)

diff --git a/drivers/iommu/arm-smmu-impl.c b/drivers/iommu/arm-smmu-impl.c
index 0b444e476525..c8904da08354 100644
--- a/drivers/iommu/arm-smmu-impl.c
+++ b/drivers/iommu/arm-smmu-impl.c
@@ -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_read_gr0(smmu, ARM_SMMU_GR0_ID7);
+	major = FIELD_GET(ID7_MAJOR, reg);
+	reg = arm_smmu_read_gr0(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_write_gr0(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_read_cb(smmu, i, ARM_SMMU_CB_ACTLR);
+		reg &= ~ARM_MMU500_ACTLR_CPRE;
+		arm_smmu_write_cb(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)
 {
 	/* The current quirks happen to be mutually-exclusive */
@@ -77,5 +123,8 @@ struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
 	if (smmu->model == CAVIUM_SMMUV2)
 		smmu->impl = &cavium_impl;
 
+	if (smmu->model == ARM_MMU500)
+		smmu->impl = &arm_mmu500_impl;
+
 	return smmu;
 }
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 80822d48f6c7..298ab9e6a6cd 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -54,12 +54,6 @@
  */
 #define QCOM_DUMMY_VAL -1
 
-#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)
-
 #define TLB_LOOP_TIMEOUT		1000000	/* 1s! */
 #define TLB_SPIN_COUNT			10
 
@@ -1574,7 +1568,7 @@ static struct iommu_ops arm_smmu_ops = {
 static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
 {
 	int i;
-	u32 reg, major;
+	u32 reg;
 
 	/* clear global FSR */
 	reg = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_sGFSR);
@@ -1587,38 +1581,10 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
 	for (i = 0; i < smmu->num_mapping_groups; ++i)
 		arm_smmu_write_sme(smmu, i);
 
-	if (smmu->model == ARM_MMU500) {
-		/*
-		 * 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 = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_ID7);
-		major = FIELD_GET(ID7_MAJOR, reg);
-		reg = arm_smmu_read_gr0(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_write_gr0(smmu, ARM_SMMU_GR0_sACR, reg);
-	}
-
 	/* Make sure all context banks are disabled and clear CB_FSR  */
 	for (i = 0; i < smmu->num_context_banks; ++i) {
 		arm_smmu_write_context_bank(smmu, i);
 		arm_smmu_write_cb(smmu, i, ARM_SMMU_CB_FSR, FSR_FAULT);
-		/*
-		 * Disable MMU-500's not-particularly-beneficial next-page
-		 * prefetcher for the sake of errata #841119 and #826419.
-		 */
-		if (smmu->model == ARM_MMU500) {
-			reg = arm_smmu_read_cb(smmu, i, ARM_SMMU_CB_ACTLR);
-			reg &= ~ARM_MMU500_ACTLR_CPRE;
-			arm_smmu_write_cb(smmu, i, ARM_SMMU_CB_ACTLR, reg);
-		}
 	}
 
 	/* Invalidate the TLB, just in case */
@@ -1652,6 +1618,9 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
 	if (smmu->features & ARM_SMMU_FEAT_EXIDS)
 		reg |= sCR0_EXIDENABLE;
 
+	if (smmu->impl && smmu->impl->reset)
+		smmu->impl->reset(smmu);
+
 	/* Push the button */
 	arm_smmu_tlb_sync_global(smmu);
 	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_sCR0, reg);
diff --git a/drivers/iommu/arm-smmu.h b/drivers/iommu/arm-smmu.h
index e79cb32802e9..616cc87a05e3 100644
--- a/drivers/iommu/arm-smmu.h
+++ b/drivers/iommu/arm-smmu.h
@@ -288,6 +288,7 @@ struct arm_smmu_impl {
 	void (*write_reg64)(struct arm_smmu_device *smmu, int page, int offset,
 			    u64 val);
 	int (*cfg_probe)(struct arm_smmu_device *smmu);
+	int (*reset)(struct arm_smmu_device *smmu);
 };
 
 static inline void __iomem *arm_smmu_page(struct arm_smmu_device *smmu, int n)
-- 
2.21.0.dirty

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