Commit 2f7f7001 authored by Xiaowei Bao's avatar Xiaowei Bao Committed by Lorenzo Pieralisi
Browse files

PCI: designware-ep: Add the doorbell mode of MSI-X in EP mode 

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

Link: https://lore.kernel.org/r/20200918080024.13639-3-Zhiqiang.Hou@nxp.com


Signed-off-by: default avatarXiaowei Bao <xiaowei.bao@nxp.com>
Signed-off-by: default avatarHou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: default avatarAndrew Murray <andrew.murray@arm.com>
parent 24ede430

drivers/pci/controller/dwc/pcie-designware-ep.c

+19 −0
Original line number Diff line number Diff line
@@ -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)

{

drivers/pci/controller/dwc/pcie-designware.h

+12 −0
Original line number Diff line number Diff line
@@ -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)

{

}