diff options
| author | Robin Murphy <robin.murphy@arm.com> | 2019-10-25 21:08:38 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-01-10 18:52:24 +0300 |
| commit | fb485eb18e632ff1071662122b9d9b7d40c23c73 (patch) | |
| tree | d834505d27be2ba860fe327fa1b004ca3aa42c3a /drivers/iommu/arm-smmu.h | |
| parent | 6f932ad369a3c3f853ffc5d93de9a73420e862b1 (diff) | |
| download | linux-fb485eb18e632ff1071662122b9d9b7d40c23c73.tar.xz | |
iommu/io-pgtable-arm: Rationalise TCR handling
Although it's conceptually nice for the io_pgtable_cfg to provide a
standard VMSA TCR value, the reality is that no VMSA-compliant IOMMU
looks exactly like an Arm CPU, and they all have various other TCR
controls which io-pgtable can't be expected to understand. Thus since
there is an expectation that drivers will have to add to the given TCR
value anyway, let's strip it down to just the essentials that are
directly relevant to io-pgtable's inner workings - namely the various
sizes and the walk attributes.
Tested-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[will: Add missing include of bitfield.h]
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/iommu/arm-smmu.h')
| -rw-r--r-- | drivers/iommu/arm-smmu.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/iommu/arm-smmu.h b/drivers/iommu/arm-smmu.h index 62b9f0cec49b..aade2b0ae175 100644 --- a/drivers/iommu/arm-smmu.h +++ b/drivers/iommu/arm-smmu.h @@ -11,6 +11,7 @@ #define _ARM_SMMU_H #include <linux/atomic.h> +#include <linux/bitfield.h> #include <linux/bits.h> #include <linux/clk.h> #include <linux/device.h> @@ -158,12 +159,24 @@ enum arm_smmu_cbar_type { #define TCR2_SEP GENMASK(17, 15) #define TCR2_SEP_UPSTREAM 0x7 #define TCR2_AS BIT(4) +#define TCR2_PASIZE GENMASK(3, 0) #define ARM_SMMU_CB_TTBR0 0x20 #define ARM_SMMU_CB_TTBR1 0x28 #define TTBRn_ASID GENMASK_ULL(63, 48) +/* arm64 headers leak this somehow :( */ +#undef TCR_T0SZ + #define ARM_SMMU_CB_TCR 0x30 +#define TCR_EAE BIT(31) +#define TCR_EPD1 BIT(23) +#define TCR_TG0 GENMASK(15, 14) +#define TCR_SH0 GENMASK(13, 12) +#define TCR_ORGN0 GENMASK(11, 10) +#define TCR_IRGN0 GENMASK(9, 8) +#define TCR_T0SZ GENMASK(5, 0) + #define ARM_SMMU_CB_CONTEXTIDR 0x34 #define ARM_SMMU_CB_S1_MAIR0 0x38 #define ARM_SMMU_CB_S1_MAIR1 0x3c @@ -318,6 +331,21 @@ struct arm_smmu_domain { struct iommu_domain domain; }; +static inline u32 arm_smmu_lpae_tcr(struct io_pgtable_cfg *cfg) +{ + return TCR_EPD1 | + FIELD_PREP(TCR_TG0, cfg->arm_lpae_s1_cfg.tcr.tg) | + FIELD_PREP(TCR_SH0, cfg->arm_lpae_s1_cfg.tcr.sh) | + FIELD_PREP(TCR_ORGN0, cfg->arm_lpae_s1_cfg.tcr.orgn) | + FIELD_PREP(TCR_IRGN0, cfg->arm_lpae_s1_cfg.tcr.irgn) | + FIELD_PREP(TCR_T0SZ, cfg->arm_lpae_s1_cfg.tcr.tsz); +} + +static inline u32 arm_smmu_lpae_tcr2(struct io_pgtable_cfg *cfg) +{ + return FIELD_PREP(TCR2_PASIZE, cfg->arm_lpae_s1_cfg.tcr.ips) | + FIELD_PREP(TCR2_SEP, TCR2_SEP_UPSTREAM); +} /* Implementation details, yay! */ struct arm_smmu_impl { |