On Fri, Jul 21, 2023 at 04:44:39PM +0900, Yoshihiro Shimoda wrote:
> The commit 24ede430fa49 ("PCI: designware-ep: Add multiple PFs support
> for DWC") added .func_conf_select() to get the configuration space of
> different PFs and assumed that the offsets between dbi and dbi2 would
> be the same. However, Renesas R-Car Gen4 PCIe controllers have different
> offsets of function 1: dbi (+0x1000) and dbi2 (+0x800). To get
> the offset for dbi2, add .func_conf_select2() and
> dw_pcie_ep_func_select2().
>
How about,
.get_dbi2_offset() and dw_pcie_ep_get_dbi2_offset()?
This would've been much simpler if dw_pcie_writeX_{dbi/dbi2} APIs accepted the
func_no argument, so that these offset calculations are contained in the API
definitions itself as it should. Then the APIs could just do "func_offset *
func_no" to get DBI base and "(func_offset * func_no) + dbi2_offset" to get DBI2
base, provided these offsets are passed by the vendor drivers.
It can be done in a separate cleanup series later.
> Notes that dw_pcie_ep_func_select2() will call .func_conf_select()
s/Notes/Note
> if .func_conf_select2() doesn't exist for backward compatibility.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> ---
> .../pci/controller/dwc/pcie-designware-ep.c | 32 ++++++++++++++-----
> drivers/pci/controller/dwc/pcie-designware.h | 3 +-
> 2 files changed, 26 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index 1d24ebf9686f..bd57516d5313 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -54,21 +54,35 @@ static unsigned int dw_pcie_ep_func_select(struct dw_pcie_ep *ep, u8 func_no)
> return func_offset;
> }
>
> +static unsigned int dw_pcie_ep_func_select2(struct dw_pcie_ep *ep, u8 func_no)
> +{
> + unsigned int func_offset = 0;
> +
> + if (ep->ops->func_conf_select2)
> + func_offset = ep->ops->func_conf_select2(ep, func_no);
> + else if (ep->ops->func_conf_select) /* for backward compatibility */
> + func_offset = ep->ops->func_conf_select(ep, func_no);
> +
> + return func_offset;
> +}
> +
> static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, u8 func_no,
> enum pci_barno bar, int flags)
> {
> - u32 reg;
> - unsigned int func_offset = 0;
> + u32 reg, reg_dbi2;
> + unsigned int func_offset, func_offset_dbi2;
Please maitain reverse Xmas tree order.
- Mani
> struct dw_pcie_ep *ep = &pci->ep;
>
> func_offset = dw_pcie_ep_func_select(ep, func_no);
> + func_offset_dbi2 = dw_pcie_ep_func_select2(ep, func_no);
>
> reg = func_offset + PCI_BASE_ADDRESS_0 + (4 * bar);
> + reg_dbi2 = func_offset_dbi2 + PCI_BASE_ADDRESS_0 + (4 * bar);
> dw_pcie_dbi_ro_wr_en(pci);
> - dw_pcie_writel_dbi2(pci, reg, 0x0);
> + dw_pcie_writel_dbi2(pci, reg_dbi2, 0x0);
> dw_pcie_writel_dbi(pci, reg, 0x0);
> if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) {
> - dw_pcie_writel_dbi2(pci, reg + 4, 0x0);
> + dw_pcie_writel_dbi2(pci, reg_dbi2 + 4, 0x0);
> dw_pcie_writel_dbi(pci, reg + 4, 0x0);
> }
> dw_pcie_dbi_ro_wr_dis(pci);
> @@ -232,13 +246,15 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
> enum pci_barno bar = epf_bar->barno;
> size_t size = epf_bar->size;
> int flags = epf_bar->flags;
> - unsigned int func_offset = 0;
> + unsigned int func_offset, func_offset_dbi2;
> int ret, type;
> - u32 reg;
> + u32 reg, reg_dbi2;
>
> func_offset = dw_pcie_ep_func_select(ep, func_no);
> + func_offset_dbi2 = dw_pcie_ep_func_select2(ep, func_no);
>
> reg = PCI_BASE_ADDRESS_0 + (4 * bar) + func_offset;
> + reg_dbi2 = PCI_BASE_ADDRESS_0 + (4 * bar) + func_offset_dbi2;
>
> if (!(flags & PCI_BASE_ADDRESS_SPACE))
> type = PCIE_ATU_TYPE_MEM;
> @@ -254,11 +270,11 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
>
> dw_pcie_dbi_ro_wr_en(pci);
>
> - dw_pcie_writel_dbi2(pci, reg, lower_32_bits(size - 1));
> + dw_pcie_writel_dbi2(pci, reg_dbi2, lower_32_bits(size - 1));
> dw_pcie_writel_dbi(pci, reg, flags);
>
> if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) {
> - dw_pcie_writel_dbi2(pci, reg + 4, upper_32_bits(size - 1));
> + dw_pcie_writel_dbi2(pci, reg_dbi2 + 4, upper_32_bits(size - 1));
> dw_pcie_writel_dbi(pci, reg + 4, 0);
> }
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 812c221b3f7c..94bc20f5f600 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -340,9 +340,10 @@ struct dw_pcie_ep_ops {
> * access for different platform, if different func have different
> * offset, return the offset of func. if use write a register way
> * return a 0, and implement code in callback function of platform
> - * driver.
> + * driver. The func_conf_select2 is for dbi2.
> */
> unsigned int (*func_conf_select)(struct dw_pcie_ep *ep, u8 func_no);
> + unsigned int (*func_conf_select2)(struct dw_pcie_ep *ep, u8 func_no);
> };
>
> struct dw_pcie_ep_func {
> --
> 2.25.1
>
--
மணிவண்ணன் சதாசிவம்
