diff options
| author | Niklas Cassel <niklas.cassel@axis.com> | 2017-12-20 00:29:27 +0100 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2017-12-21 11:10:00 +0000 |
| commit | 6f6d7873711c5721308386018a8404bc9a7ecd1d (patch) | |
| tree | 6798d8e4ea9a578d0d8801884a190e920e97470f /drivers/pci/dwc/pcie-designware-ep.c | |
| parent | 9e7181199e1b623c94bda02a63728f62b00ea915 (diff) | |
PCI: designware-ep: Add generic function for raising MSI irq
Add a generic function for raising MSI irqs that can be used by all
DWC based controllers.
Note that certain controllers, like DRA7xx, have a special convenience
register for raising MSI irqs that doesn't require you to explicitly map
the MSI address. Therefore, it is likely that certain drivers will
not use this generic function, even if they can.
Tested-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
Diffstat (limited to 'drivers/pci/dwc/pcie-designware-ep.c')
| -rw-r--r-- | drivers/pci/dwc/pcie-designware-ep.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c index 700ed2f4becf..c5aa1cac5041 100644 --- a/drivers/pci/dwc/pcie-designware-ep.c +++ b/drivers/pci/dwc/pcie-designware-ep.c @@ -282,6 +282,41 @@ static const struct pci_epc_ops epc_ops = { .stop = dw_pcie_ep_stop, }; +int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, + u8 interrupt_num) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + struct pci_epc *epc = ep->epc; + u16 msg_ctrl, msg_data; + u32 msg_addr_lower, msg_addr_upper; + u64 msg_addr; + bool has_upper; + int ret; + + /* Raise MSI per the PCI Local Bus Specification Revision 3.0, 6.8.1. */ + msg_ctrl = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL); + has_upper = !!(msg_ctrl & PCI_MSI_FLAGS_64BIT); + msg_addr_lower = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_L32); + if (has_upper) { + msg_addr_upper = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_U32); + msg_data = dw_pcie_readw_dbi(pci, MSI_MESSAGE_DATA_64); + } else { + msg_addr_upper = 0; + msg_data = dw_pcie_readw_dbi(pci, MSI_MESSAGE_DATA_32); + } + msg_addr = ((u64) msg_addr_upper) << 32 | msg_addr_lower; + ret = dw_pcie_ep_map_addr(epc, ep->msi_mem_phys, msg_addr, + epc->mem->page_size); + if (ret) + return ret; + + writel(msg_data | (interrupt_num - 1), ep->msi_mem); + + dw_pcie_ep_unmap_addr(epc, ep->msi_mem_phys); + + return 0; +} + void dw_pcie_ep_exit(struct dw_pcie_ep *ep) { struct pci_epc *epc = ep->epc; |