[PATCH v2 4/6] iommu/ipmmu-vmsa: Calculate context registers' offset instead of a macro

[Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>]

Since we will have changed memory mapping of the IPMMU in the future,
this patch uses ipmmu_features values instead of a macro to
calculate context registers offset. No behavior change.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/iommu/ipmmu-vmsa.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index c60b31d..37bb4b7 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -50,6 +50,8 @@ struct ipmmu_features {
 	bool twobit_imttbcr_sl0;
 	bool reserved_context;
 	bool cache_snoop;
+	unsigned int ctx_offset_base;
+	unsigned int ctx_offset_stride;
 };
 
 struct ipmmu_vmsa_device {
@@ -99,8 +101,6 @@ static struct ipmmu_vmsa_device *to_ipmmu(struct device *dev)
 
 #define IM_NS_ALIAS_OFFSET		0x800
 
-#define IM_CTX_SIZE			0x40
-
 /* MMU "context" registers */
 #define IMCTR				0x0000		/* R-Car Gen2/3 */
 #define IMCTR_INTEN			(1 << 2)	/* R-Car Gen2/3 */
@@ -193,7 +193,8 @@ static void ipmmu_write(struct ipmmu_vmsa_device *mmu, unsigned int offset,
 static unsigned int ipmmu_ctx_reg(struct ipmmu_vmsa_device *mmu,
 				  unsigned int context_id, unsigned int reg)
 {
-	return context_id * IM_CTX_SIZE + reg;
+	return mmu->features->ctx_offset_base +
+	       context_id * mmu->features->ctx_offset_stride + reg;
 }
 
 static u32 ipmmu_ctx_read(struct ipmmu_vmsa_device *mmu,
@@ -937,6 +938,8 @@ static const struct ipmmu_features ipmmu_features_default = {
 	.twobit_imttbcr_sl0 = false,
 	.reserved_context = false,
 	.cache_snoop = true,
+	.ctx_offset_base = 0,
+	.ctx_offset_stride = 0x40,
 };
 
 static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
@@ -948,6 +951,8 @@ static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
 	.twobit_imttbcr_sl0 = true,
 	.reserved_context = true,
 	.cache_snoop = false,
+	.ctx_offset_base = 0,
+	.ctx_offset_stride = 0x40,
 };
 
 static const struct of_device_id ipmmu_of_ids[] = {
-- 
2.7.4