[PATCHv7 02/12] PCI: designware-ep: Add the doorbell mode of MSI-X in EP mode

Zhiqiang Hou
2020-08-11T10:02:07Z

From: Xiaowei Bao <xiaowei.bao@nxp.com>

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>
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
---
V7:
- Rebase the patch without functionality change.

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 e5bd3a5ef380..e76b504ed465 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -471,6 +471,20 @@ 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 89f8271ec5ee..745b4938225a 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -97,6 +97,9 @@
#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)
@@ -434,6 +437,8 @@ 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)
@@ -475,6 +480,13 @@ 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)
{
}
--
2.17.1