From: Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>
To: <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <bhelgaas@google.com>,
Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>
Subject: [PATCH] PCI: xilinx-nwl: Enable coherenct PCIe traffic using CCI
Date: Thu, 21 Jan 2021 15:29:16 +0530 [thread overview]
Message-ID: <1611223156-8787-1-git-send-email-bharat.kumar.gogada@xilinx.com> (raw)
- 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@xilinx.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
next reply other threads:[~2021-01-21 10:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-21 9:59 Bharat Kumar Gogada [this message]
2021-01-21 16:28 ` [PATCH] PCI: xilinx-nwl: Enable coherenct PCIe traffic using CCI Bjorn Helgaas
2021-01-27 5:03 ` Bharat Kumar Gogada
2021-01-27 15:23 ` Bjorn Helgaas
2021-01-27 17:36 ` Rob Herring
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