linux-kernel - [PATCH v1 5/6] PCI: qcom-ep: Provide number of read/write channel for HDMA

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Date: Fri, 19 Jan 2024 18:30:21 +0530
From: Mrinmay Sarkar <quic_msarkar@...cinc.com>
To: vkoul@...nel.org, jingoohan1@...il.com, conor+dt@...nel.org,
        konrad.dybcio@...aro.org, manivannan.sadhasivam@...aro.org,
        robh+dt@...nel.org
Cc: quic_shazhuss@...cinc.com, quic_nitegupt@...cinc.com,
        quic_ramkri@...cinc.com, quic_nayiluri@...cinc.com,
        dmitry.baryshkov@...aro.org, quic_krichai@...cinc.com,
        quic_vbadigan@...cinc.com, quic_parass@...cinc.com,
        quic_schintav@...cinc.com, quic_shijjose@...cinc.com,
        Mrinmay Sarkar <quic_msarkar@...cinc.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Kishon Vijay Abraham I <kishon@...nel.org>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, mhi@...ts.linux.dev
Subject: [PATCH v1 5/6] PCI: qcom-ep: Provide number of read/write channel for HDMA

There is no standard way to auto detect the number of available
read/write channels in a platform. So adding this change to provide
read/write channels count and also provide "EDMA_MF_HDMA_NATIVE"
flag to support HDMA for 8775 platform.

8775 has IP version 1.34.0 so intruduce a new cfg(cfg_1_34_0) for
this platform. Add struct qcom_pcie_ep_cfg as match data. Assign
hdma_supported flag into struct qcom_pcie_ep_cfg and set it true
in cfg_1_34_0.

Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>
---
 drivers/pci/controller/dwc/pcie-qcom-ep.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 45008e0..8d56435 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -149,6 +149,10 @@ enum qcom_pcie_ep_link_status {
 	QCOM_PCIE_EP_LINK_DOWN,
 };
 
+struct qcom_pcie_ep_cfg {
+	bool hdma_supported;
+};
+
 /**
  * struct qcom_pcie_ep - Qualcomm PCIe Endpoint Controller
  * @pci: Designware PCIe controller struct
@@ -167,6 +171,7 @@ enum qcom_pcie_ep_link_status {
  * @num_clks: PCIe clocks count
  * @perst_en: Flag for PERST enable
  * @perst_sep_en: Flag for PERST separation enable
+ * @cfg: PCIe EP config struct
  * @link_status: PCIe Link status
  * @global_irq: Qualcomm PCIe specific Global IRQ
  * @perst_irq: PERST# IRQ
@@ -194,6 +199,7 @@ struct qcom_pcie_ep {
 	u32 perst_en;
 	u32 perst_sep_en;
 
+	const struct qcom_pcie_ep_cfg *cfg;
 	enum qcom_pcie_ep_link_status link_status;
 	int global_irq;
 	int perst_irq;
@@ -511,6 +517,10 @@ static void qcom_pcie_perst_assert(struct dw_pcie *pci)
 	pcie_ep->link_status = QCOM_PCIE_EP_LINK_DISABLED;
 }
 
+static const struct qcom_pcie_ep_cfg cfg_1_34_0 = {
+	.hdma_supported = true,
+};
+
 /* Common DWC controller ops */
 static const struct dw_pcie_ops pci_ops = {
 	.link_up = qcom_pcie_dw_link_up,
@@ -816,6 +826,13 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev)
 	pcie_ep->pci.ops = &pci_ops;
 	pcie_ep->pci.ep.ops = &pci_ep_ops;
 	pcie_ep->pci.edma.nr_irqs = 1;
+
+	pcie_ep->cfg = of_device_get_match_data(dev);
+	if (pcie_ep->cfg && pcie_ep->cfg->hdma_supported) {
+		pcie_ep->pci.edma.ll_wr_cnt = 1;
+		pcie_ep->pci.edma.ll_rd_cnt = 1;
+		pcie_ep->pci.edma.mf = EDMA_MF_HDMA_NATIVE;
+	}
 	platform_set_drvdata(pdev, pcie_ep);
 
 	ret = qcom_pcie_ep_get_resources(pdev, pcie_ep);
@@ -875,7 +892,7 @@ static void qcom_pcie_ep_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id qcom_pcie_ep_match[] = {
-	{ .compatible = "qcom,sa8775p-pcie-ep", },
+	{ .compatible = "qcom,sa8775p-pcie-ep", .data = &cfg_1_34_0},
 	{ .compatible = "qcom,sdx55-pcie-ep", },
 	{ .compatible = "qcom,sm8450-pcie-ep", },
 	{ }
-- 
2.7.4