109 lines
2.8 KiB
Diff
109 lines
2.8 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 4 Sep 2020 18:42:42 +0200
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Subject: [PATCH] pci: pcie-mediatek: add support for coherent DMA
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It improves performance by eliminating the need for a cache flush for DMA on
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attached devices
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi
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+++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
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@@ -812,6 +812,8 @@
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reg = <0 0x1a143000 0 0x1000>;
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reg-names = "port0";
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mediatek,pcie-cfg = <&pciecfg>;
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+ mediatek,hifsys = <&hifsys>;
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+ mediatek,cci-control = <&cci_control2>;
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#address-cells = <3>;
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#size-cells = <2>;
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interrupts = <GIC_SPI 228 IRQ_TYPE_LEVEL_LOW>;
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@@ -829,6 +831,7 @@
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bus-range = <0x00 0xff>;
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ranges = <0x82000000 0 0x20000000 0x0 0x20000000 0 0x8000000>;
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status = "disabled";
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+ dma-coherent;
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slot0: pcie@0,0 {
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reg = <0x0000 0 0 0 0>;
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@@ -855,6 +858,8 @@
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reg = <0 0x1a145000 0 0x1000>;
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reg-names = "port1";
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mediatek,pcie-cfg = <&pciecfg>;
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+ mediatek,hifsys = <&hifsys>;
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+ mediatek,cci-control = <&cci_control2>;
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#address-cells = <3>;
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#size-cells = <2>;
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interrupts = <GIC_SPI 229 IRQ_TYPE_LEVEL_LOW>;
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@@ -873,6 +878,7 @@
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bus-range = <0x00 0xff>;
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ranges = <0x82000000 0 0x28000000 0x0 0x28000000 0 0x8000000>;
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status = "disabled";
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+ dma-coherent;
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slot1: pcie@1,0 {
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reg = <0x0800 0 0 0 0>;
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@@ -932,6 +938,11 @@
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};
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};
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+ hifsys: syscon@1af00000 {
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+ compatible = "mediatek,mt7622-hifsys", "syscon";
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+ reg = <0 0x1af00000 0 0x70>;
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+ };
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+
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ethsys: syscon@1b000000 {
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compatible = "mediatek,mt7622-ethsys",
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"syscon";
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--- a/drivers/pci/controller/pcie-mediatek.c
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+++ b/drivers/pci/controller/pcie-mediatek.c
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@@ -20,6 +20,7 @@
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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#include <linux/of_platform.h>
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+#include <linux/of_address.h>
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#include <linux/pci.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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@@ -139,6 +140,11 @@
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#define PCIE_LINK_STATUS_V2 0x804
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#define PCIE_PORT_LINKUP_V2 BIT(10)
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+/* DMA channel mapping */
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+#define HIFSYS_DMA_AG_MAP 0x008
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+#define HIFSYS_DMA_AG_MAP_PCIE0 BIT(0)
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+#define HIFSYS_DMA_AG_MAP_PCIE1 BIT(1)
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+
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struct mtk_pcie_port;
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/**
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@@ -1042,6 +1048,27 @@ static int mtk_pcie_setup(struct mtk_pci
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struct mtk_pcie_port *port, *tmp;
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int err;
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+ if (of_dma_is_coherent(node)) {
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+ struct regmap *con;
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+ u32 mask;
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+
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+ con = syscon_regmap_lookup_by_phandle(node,
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+ "mediatek,cci-control");
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+ /* enable CPU/bus coherency */
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+ if (!IS_ERR(con))
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+ regmap_write(con, 0, 3);
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+
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+ con = syscon_regmap_lookup_by_phandle(node,
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+ "mediatek,hifsys");
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+ if (IS_ERR(con)) {
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+ dev_err(dev, "missing hifsys node\n");
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+ return PTR_ERR(con);
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+ }
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+
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+ mask = HIFSYS_DMA_AG_MAP_PCIE0 | HIFSYS_DMA_AG_MAP_PCIE1;
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+ regmap_update_bits(con, HIFSYS_DMA_AG_MAP, mask, mask);
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+ }
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+
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for_each_available_child_of_node(node, child) {
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int slot;
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