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

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Message-Id: <20230128111114.4049-5-sven@svenpeter.dev>
Date:   Sat, 28 Jan 2023 12:11:14 +0100
From:   Sven Peter <sven@...npeter.dev>
To:     Hector Martin <marcan@...can.st>, 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: [PATCH 4/4] iommu: dart: Add support for M1 USB4 PCIe DART

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 },
 	{},
-- 
2.25.1