On Wed, Jun 12, 2019 at 02:42:00PM +0800, Ley Foon Tan wrote:
> This fix issue when access config from PCIe switch.
>
> Stratix 10 PCIe controller does not support Type 1 to Type 0 conversion
> as previous version (V1) does.
>
> The PCIe controller need to send Type 0 config TLP if the targeting bus
> matches with the secondary bus number, which is when the TLP is targeting
> the immediate device on the link.
>
> The PCIe controller send Type 1 config TLP if the targeting bus is
> larger than the secondary bus, which is when the TLP is targeting the
> device not immediate on the link.
>
> Signed-off-by: Ley Foon Tan <ley.foon.tan@xxxxxxxxx>
>
> ---
> v2:
> - Add get_tlp_header() function.
> ---
> drivers/pci/controller/pcie-altera.c | 41 ++++++++++++++++++----------
> 1 file changed, 27 insertions(+), 14 deletions(-)
Applied to pci/altera for v5.3, thanks.
Lorenzo
> diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
> index 27222071ace7..d2497ca43828 100644
> --- a/drivers/pci/controller/pcie-altera.c
> +++ b/drivers/pci/controller/pcie-altera.c
> @@ -44,6 +44,8 @@
> #define S10_RP_RXCPL_STATUS 0x200C
> #define S10_RP_CFG_ADDR(pcie, reg) \
> (((pcie)->hip_base) + (reg) + (1 << 20))
> +#define S10_RP_SECONDARY(pcie) \
> + readb(S10_RP_CFG_ADDR(pcie, PCI_SECONDARY_BUS))
>
> /* TLP configuration type 0 and 1 */
> #define TLP_FMTTYPE_CFGRD0 0x04 /* Configuration Read Type 0 */
> @@ -55,14 +57,9 @@
> #define TLP_WRITE_TAG 0x10
> #define RP_DEVFN 0
> #define TLP_REQ_ID(bus, devfn) (((bus) << 8) | (devfn))
> -#define TLP_CFGRD_DW0(pcie, bus) \
> - ((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgrd0 \
> - : pcie->pcie_data->cfgrd1) << 24) | \
> - TLP_PAYLOAD_SIZE)
> -#define TLP_CFGWR_DW0(pcie, bus) \
> - ((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgwr0 \
> - : pcie->pcie_data->cfgwr1) << 24) | \
> - TLP_PAYLOAD_SIZE)
> +#define TLP_CFG_DW0(pcie, cfg) \
> + (((cfg) << 24) | \
> + TLP_PAYLOAD_SIZE)
> #define TLP_CFG_DW1(pcie, tag, be) \
> (((TLP_REQ_ID(pcie->root_bus_nr, RP_DEVFN)) << 16) | (tag << 8) | (be))
> #define TLP_CFG_DW2(bus, devfn, offset) \
> @@ -322,14 +319,31 @@ static void s10_tlp_write_packet(struct altera_pcie *pcie, u32 *headers,
> s10_tlp_write_tx(pcie, data, RP_TX_EOP);
> }
>
> +static void get_tlp_header(struct altera_pcie *pcie, u8 bus, u32 devfn,
> + int where, u8 byte_en, bool read, u32 *headers)
> +{
> + u8 cfg;
> + u8 cfg0 = read ? pcie->pcie_data->cfgrd0 : pcie->pcie_data->cfgwr0;
> + u8 cfg1 = read ? pcie->pcie_data->cfgrd1 : pcie->pcie_data->cfgwr1;
> + u8 tag = read ? TLP_READ_TAG : TLP_WRITE_TAG;
> +
> + if (pcie->pcie_data->version == ALTERA_PCIE_V1)
> + cfg = (bus == pcie->root_bus_nr) ? cfg0 : cfg1;
> + else
> + cfg = (bus > S10_RP_SECONDARY(pcie)) ? cfg0 : cfg1;
> +
> + headers[0] = TLP_CFG_DW0(pcie, cfg);
> + headers[1] = TLP_CFG_DW1(pcie, tag, byte_en);
> + headers[2] = TLP_CFG_DW2(bus, devfn, where);
> +}
> +
> static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
> int where, u8 byte_en, u32 *value)
> {
> u32 headers[TLP_HDR_SIZE];
>
> - headers[0] = TLP_CFGRD_DW0(pcie, bus);
> - headers[1] = TLP_CFG_DW1(pcie, TLP_READ_TAG, byte_en);
> - headers[2] = TLP_CFG_DW2(bus, devfn, where);
> + get_tlp_header(pcie, bus, devfn, where, byte_en, true,
> + headers);
>
> pcie->pcie_data->ops->tlp_write_pkt(pcie, headers, 0, false);
>
> @@ -342,9 +356,8 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
> u32 headers[TLP_HDR_SIZE];
> int ret;
>
> - headers[0] = TLP_CFGWR_DW0(pcie, bus);
> - headers[1] = TLP_CFG_DW1(pcie, TLP_WRITE_TAG, byte_en);
> - headers[2] = TLP_CFG_DW2(bus, devfn, where);
> + get_tlp_header(pcie, bus, devfn, where, byte_en, false,
> + headers);
>
> /* check alignment to Qword */
> if ((where & 0x7) == 0)
> --
> 2.19.0
>
