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Subject[PATCH 4/4] iommu: dart: Support t6000 variant
Date
The M1 Pro/Max SoCs come with a new variant of DART which supports a
larger physical address space with a slightly different PTE format.
Pass through the correct paddr address space size to the io-pgtable code
which will take care of the rest.

Signed-off-by: Sven Peter <sven@svenpeter.dev>
---
drivers/iommu/apple-dart.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index 565ef5598811..c04648dfd747 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c
@@ -81,10 +81,15 @@
#define DART_TTBR_VALID BIT(31)
#define DART_TTBR_SHIFT 12

+struct apple_dart_hw {
+ u32 oas;
+};
+
/*
* Private structure associated with each DART device.
*
* @dev: device struct
+ * @hw: SoC-specific hardware data
* @regs: mapped MMIO region
* @irq: interrupt number, can be shared with other DARTs
* @clks: clocks associated with this DART
@@ -98,6 +103,7 @@
*/
struct apple_dart {
struct device *dev;
+ const struct apple_dart_hw *hw;

void __iomem *regs;

@@ -421,7 +427,7 @@ static int apple_dart_finalize_domain(struct iommu_domain *domain,
pgtbl_cfg = (struct io_pgtable_cfg){
.pgsize_bitmap = dart->pgsize,
.ias = 32,
- .oas = 36,
+ .oas = dart->hw->oas,
.coherent_walk = 1,
.iommu_dev = dart->dev,
};
@@ -855,6 +861,7 @@ static int apple_dart_probe(struct platform_device *pdev)
return -ENOMEM;

dart->dev = dev;
+ dart->hw = of_device_get_match_data(dev);
spin_lock_init(&dart->lock);

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -944,8 +951,16 @@ static int apple_dart_remove(struct platform_device *pdev)
return 0;
}

+static const struct apple_dart_hw apple_dart_hw_t8103 = {
+ .oas = 36,
+};
+static const struct apple_dart_hw apple_dart_hw_t6000 = {
+ .oas = 42,
+};
+
static const struct of_device_id apple_dart_of_match[] = {
- { .compatible = "apple,t8103-dart", .data = NULL },
+ { .compatible = "apple,t8103-dart", .data = &apple_dart_hw_t8103 },
+ { .compatible = "apple,t6000-dart", .data = &apple_dart_hw_t6000 },
{},
};
MODULE_DEVICE_TABLE(of, apple_dart_of_match);
--
2.25.1
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