Hi Niklas,
On Wednesday 20 December 2017 04:59 AM, Niklas Cassel wrote:
> 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.
>
> Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxx>
> ---
> drivers/pci/dwc/pcie-designware-ep.c | 35 +++++++++++++++++++++++++++++++++++
> drivers/pci/dwc/pcie-designware.h | 9 +++++++++
> 2 files changed, 44 insertions(+)
>
> 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);
Shouldn't this be msg_data + (interrupt_num - 1)?
Thanks
Kishon
