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From:   Xiaowei Bao <xiaowei.bao@nxp.com>
To:     robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org,
        leoyang.li@nxp.com, kishon@ti.com, lorenzo.pieralisi@arm.com,
        minghuan.Lian@nxp.com, mingkai.hu@nxp.com, roy.zang@nxp.com,
        jingoohan1@gmail.com, gustavo.pimentel@synopsys.com,
        andrew.murray@arm.com, linux-pci@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Cc:     Xiaowei Bao <xiaowei.bao@nxp.com>
Subject: [PATCH v4 02/11] PCI: designware-ep: Add the doorbell mode of MSI-X in EP mode
Date:   Tue, 24 Sep 2019 10:18:40 +0800
Message-Id: <20190924021849.3185-3-xiaowei.bao@nxp.com>
In-Reply-To: <20190924021849.3185-1-xiaowei.bao@nxp.com>
References: <20190924021849.3185-1-xiaowei.bao@nxp.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Add the doorbell mode of MSI-X in DWC EP driver.

Signed-off-by: Xiaowei Bao <xiaowei.bao@nxp.com>
Reviewed-by: Andrew Murray <andrew.murray@arm.com>
---
v2:
 - Remove the macro of no used.
v3:
 - No change.
v4:
 - Modify the commit message.

 drivers/pci/controller/dwc/pcie-designware-ep.c | 14 ++++++++++++++
 drivers/pci/controller/dwc/pcie-designware.h    | 12 ++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index eb851c2..55b23ce 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -449,6 +449,20 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
+int dw_pcie_ep_raise_msix_irq_doorbell(struct dw_pcie_ep *ep, u8 func_no,
+				       u16 interrupt_num)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	u32 msg_data;
+
+	msg_data = (func_no << PCIE_MSIX_DOORBELL_PF_SHIFT) |
+		   (interrupt_num - 1);
+
+	dw_pcie_writel_dbi(pci, PCIE_MSIX_DOORBELL, msg_data);
+
+	return 0;
+}
+
 int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
 			      u16 interrupt_num)
 {
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 6aca0bb..56789be 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -88,6 +88,9 @@
 #define PCIE_MISC_CONTROL_1_OFF		0x8BC
 #define PCIE_DBI_RO_WR_EN		BIT(0)
 
+#define PCIE_MSIX_DOORBELL		0x948
+#define PCIE_MSIX_DOORBELL_PF_SHIFT	24
+
 #define PCIE_PL_CHK_REG_CONTROL_STATUS			0xB20
 #define PCIE_PL_CHK_REG_CHK_REG_START			BIT(0)
 #define PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS		BIT(1)
@@ -419,6 +422,8 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
 			     u8 interrupt_num);
 int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
 			     u16 interrupt_num);
+int dw_pcie_ep_raise_msix_irq_doorbell(struct dw_pcie_ep *ep, u8 func_no,
+				       u16 interrupt_num);
 void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar);
 #else
 static inline void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
@@ -451,6 +456,13 @@ static inline int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
+static inline int dw_pcie_ep_raise_msix_irq_doorbell(struct dw_pcie_ep *ep,
+						     u8 func_no,
+						     u16 interrupt_num)
+{
+	return 0;
+}
+
 static inline void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
 {
 }
-- 
2.9.5