linux-kernel - Re: [PATCH 4/4] iommu: dart: Add support for M1 USB4 PCIe DART

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Date:   Sat, 28 Jan 2023 20:46:40 +0900
From:   Hector Martin <marcan@...can.st>
To:     Sven Peter <sven@...npeter.dev>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        linux-arm-kernel@...ts.infradead.org, asahi@...ts.linux.dev,
        iommu@...ts.linux.dev, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] iommu: dart: Add support for M1 USB4 PCIe DART

On 28/01/2023 20.11, Sven Peter wrote:
> This variant of the regular t8103 DART is used for the two
> USB4/Thunderbolt PCIe controllers. It supports 64 instead of 16 streams
> which requires a slightly different MMIO layout. We also disallow bypass
> support since these DARTs will only ever be used for externally facing
> devices on the USB4 ports.
> 
> Signed-off-by: Sven Peter <sven@...npeter.dev>
> ---
>  drivers/iommu/apple-dart.c | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
> index 7579c97a9062..a1304ba3639b 100644
> --- a/drivers/iommu/apple-dart.c
> +++ b/drivers/iommu/apple-dart.c
> @@ -81,6 +81,7 @@
>  #define DART_T8020_TCR_BYPASS_DAPF      BIT(12)
>  
>  #define DART_T8020_TTBR       0x200
> +#define DART_T8020_USB4_TTBR  0x400
>  #define DART_T8020_TTBR_VALID BIT(31)
>  #define DART_T8020_TTBR_ADDR_FIELD_SHIFT 0
>  #define DART_T8020_TTBR_SHIFT 12
> @@ -1184,6 +1185,35 @@ static const struct apple_dart_hw apple_dart_hw_t8103 = {
>  	.ttbr_shift = DART_T8020_TTBR_SHIFT,
>  	.ttbr_count = 4,
>  };
> +
> +static const struct apple_dart_hw apple_dart_hw_t8103_usb4 = {
> +	.type = DART_T8020,
> +	.irq_handler = apple_dart_t8020_irq,
> +	.invalidate_tlb = apple_dart_t8020_hw_invalidate_tlb,
> +	.oas = 36,
> +	.fmt = APPLE_DART,
> +	.max_sid_count = 64,
> +
> +	.enable_streams = DART_T8020_STREAMS_ENABLE,
> +	.lock = DART_T8020_CONFIG,
> +	.lock_bit = DART_T8020_CONFIG_LOCK,
> +
> +	.error = DART_T8020_ERROR,
> +
> +	.tcr = DART_T8020_TCR,
> +	.tcr_enabled = DART_T8020_TCR_TRANSLATE_ENABLE,
> +	.tcr_disabled = 0,
> +	.tcr_bypass = 0,
> +
> +	.ttbr = DART_T8020_USB4_TTBR,
> +	.ttbr_valid = DART_T8020_TTBR_VALID,
> +	.ttbr_addr_field_shift = DART_T8020_TTBR_ADDR_FIELD_SHIFT,
> +	.ttbr_shift = DART_T8020_TTBR_SHIFT,
> +	.ttbr_count = 4,
> +
> +	.disable_bypass = true,
> +};
> +
>  static const struct apple_dart_hw apple_dart_hw_t6000 = {
>  	.type = DART_T6000,
>  	.irq_handler = apple_dart_t8020_irq,
> @@ -1276,6 +1306,7 @@ DEFINE_SIMPLE_DEV_PM_OPS(apple_dart_pm_ops, apple_dart_suspend, apple_dart_resum
>  
>  static const struct of_device_id apple_dart_of_match[] = {
>  	{ .compatible = "apple,t8103-dart", .data = &apple_dart_hw_t8103 },
> +	{ .compatible = "apple,t8103-dart-usb4", .data = &apple_dart_hw_t8103_usb4 },
>  	{ .compatible = "apple,t8110-dart", .data = &apple_dart_hw_t8110 },
>  	{ .compatible = "apple,t6000-dart", .data = &apple_dart_hw_t6000 },
>  	{},

Other than the compatible as per patch #1,

Acked-by: Hector Martin <marcan@...can.st>

- Hector