> From: Janne Grunau <j...@jannau.net>
> Date: Fri, 1 Jul 2022 00:06:16 +0200
>
> "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 <kette...@openbsd.org>
> ---
> drivers/iommu/apple_dart.c | 18 +++++++++++++++++-
> 1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/apple_dart.c b/drivers/iommu/apple_dart.c
> index f2e170096072..2faacb8f3b6f 100644
> --- a/drivers/iommu/apple_dart.c
> +++ b/drivers/iommu/apple_dart.c
> @@ -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 */ }
> };
>
> --
> 2.35.1
>
>
