linux-kernel - [PATCH] PCI: xilinx-nwl: Enable coherenct PCIe traffic using CCI

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Message-ID: <1611223156-8787-1-git-send-email-bharat.kumar.gogada@xilinx.com>
Date:   Thu, 21 Jan 2021 15:29:16 +0530
From:   Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <bhelgaas@...gle.com>,
        Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
Subject: [PATCH] PCI: xilinx-nwl: Enable coherenct PCIe traffic using CCI

- Add support for routing PCIe traffic coherently when
 Cache Coherent Interconnect(CCI) is enabled in the system.

Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
---
 drivers/pci/controller/pcie-xilinx-nwl.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c
index 07e3666..08e06057 100644
--- a/drivers/pci/controller/pcie-xilinx-nwl.c
+++ b/drivers/pci/controller/pcie-xilinx-nwl.c
@@ -26,6 +26,7 @@
 
 /* Bridge core config registers */
 #define BRCFG_PCIE_RX0			0x00000000
+#define BRCFG_PCIE_RX1			0x00000004
 #define BRCFG_INTERRUPT			0x00000010
 #define BRCFG_PCIE_RX_MSG_FILTER	0x00000020
 
@@ -128,6 +129,7 @@
 #define NWL_ECAM_VALUE_DEFAULT		12
 
 #define CFG_DMA_REG_BAR			GENMASK(2, 0)
+#define CFG_PCIE_CACHE			GENMASK(7, 0)
 
 #define INT_PCI_MSI_NR			(2 * 32)
 
@@ -675,6 +677,12 @@ static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
 	nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK,
 			  BRCFG_PCIE_RX_MSG_FILTER);
 
+	/* This routes the PCIe DMA traffic to go through CCI path */
+	if (of_dma_is_coherent(dev->of_node)) {
+		nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX1) |
+				  CFG_PCIE_CACHE, BRCFG_PCIE_RX1);
+	}
+
 	err = nwl_wait_for_link(pcie);
 	if (err)
 		return err;
-- 
2.7.4