From: Xiaowei Bao <xiaowei.bao@xxxxxxx>
Add the doorbell mode of MSI-X in DWC EP driver.
Signed-off-by: Xiaowei Bao <xiaowei.bao@xxxxxxx>
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
Reviewed-by: Andrew Murray <andrew.murray@xxxxxxx>
---
V8:
- Add msix cap check.
.../pci/controller/dwc/pcie-designware-ep.c | 19 +++++++++++++++++++
drivers/pci/controller/dwc/pcie-designware.h | 12 ++++++++++++
2 files changed, 31 insertions(+)
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 500d4ca04947..5ae87e8ffb85 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -473,6 +473,25 @@ 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);
+ struct dw_pcie_ep_func *ep_func;
+ u32 msg_data;
+
+ ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
+ if (!ep_func || !ep_func->msix_cap)
+ return -EINVAL;
+
+ 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 32102ebc5c37..4b75b798de98 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -105,6 +105,9 @@
#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)
@@ -414,6 +417,8 @@ 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)
@@ -455,6 +460,13 @@ 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
