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iommu: Add M2 support to Apple DART driver

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"apple,t8112-dart" uses an incompatible register interface but still
offers the same functionality. This DART is found on the M2 and M1
Pro/Max/Ultra SoCs.

Signed-off-by: Janne Grunau <j@jannau.net>
Reviewed-by: Mark Kettenis <kettenis@openbsd.org>
This commit is contained in:
Janne Grunau 2022-07-01 00:06:16 +02:00 committed by Tom Rini
parent 538f6643b0
commit 6e0793f485
1 changed files with 17 additions and 1 deletions
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18
drivers/iommu/apple_dart.c
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@ -24,6 +24,12 @@
#define DART_TTBR_VALID BIT(31)
#define DART_TTBR_SHIFT 12
#define DART_T8110_TCR(sid) (0x1000 + 4 * (sid))
#define DART_T8110_TCR_BYPASS_DAPF BIT(2)
#define DART_T8110_TCR_BYPASS_DART BIT(1)
#define DART_T8110_TCR_TRANSLATE_ENABLE BIT(0)
#define DART_T8110_TTBR(sid) (0x1400 + 4 * (sid))
static int apple_dart_probe(struct udevice *dev)
{
void *base;
@ -34,7 +40,16 @@ static int apple_dart_probe(struct udevice *dev)
return -EINVAL;
u32 params2 = readl(base + DART_PARAMS2);
if (params2 & DART_PARAMS2_BYPASS_SUPPORT) {
if (!(params2 & DART_PARAMS2_BYPASS_SUPPORT))
return 0;
if (device_is_compatible(dev, "apple,t8112-dart")) {
for (sid = 0; sid < 256; sid++) {
writel(DART_T8110_TCR_BYPASS_DART | DART_T8110_TCR_BYPASS_DAPF,
base + DART_T8110_TCR(sid));
writel(0, base + DART_T8110_TTBR(sid));
}
} else {
for (sid = 0; sid < 16; sid++) {
writel(DART_TCR_BYPASS_DART | DART_TCR_BYPASS_DAPF,
base + DART_TCR(sid));
@ -49,6 +64,7 @@ static int apple_dart_probe(struct udevice *dev)
static const struct udevice_id apple_dart_ids[] = {
{ .compatible = "apple,t8103-dart" },
{ .compatible = "apple,t6000-dart" },
{ .compatible = "apple,t8112-dart" },
{ /* sentinel */ }
};