[PATCH v3 4/6] iommu/ipmmu-vmsa: Calculate context registers' offset instead of a macro

[Yoshihiro Shimoda]

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...@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+rene...@glider.be>
---
 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 c4fcfda..8e2ca1c 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,
@@ -939,6 +940,8 @@ 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 = {
@@ -950,6 +953,8 @@ 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

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