git.ipfire.org Git - thirdparty/openwrt.git/blob

   1 From dfbadb86b3bc43c004671ab6eb46ee160a192e98 Mon Sep 17 00:00:00 2001
   2 From: Weijie Gao <weijie.gao@mediatek.com>
   3 Date: Fri, 17 Jan 2025 17:18:11 +0800
   4 Subject: [PATCH 09/15] pci: mediatek: add support for multiple ports in
   5  mediatek pcie gen3 driver
   6
   7 One MediaTek PCIe Gen3 controller has only one port, where PCI bus 0
   8 on this port represents the controller itself and bus 1 represents
   9 the external PCIe device.
  10
  11 If multiple PCIe controllers are probed in U-Boot, U-Boot will use
  12 bus numbers greater than 2 as input parameters. Therefore, we should
  13 convert the BDF bus number to either 0 or 1 by subtracting the
  14 offset by controller->seq_.
  15
  16 Signed-off-by: Sam Shih <sam.shih@mediatek.com>
  17 Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
  18 ---
  19  drivers/pci/pcie_mediatek_gen3.c | 24 ++++++++++++++++++++++++
  20  1 file changed, 24 insertions(+)
  21
  22 --- a/drivers/pci/pcie_mediatek_gen3.c
  23 +++ b/drivers/pci/pcie_mediatek_gen3.c
  24 @@ -83,6 +83,28 @@ struct mtk_pcie {
  25         struct phy phy;
  26  };
  27
  28 +static pci_dev_t convert_bdf(const struct udevice *controller, pci_dev_t bdf)
  29 +{
  30 +       int bdfs[3];
  31 +
  32 +       bdfs[0] = PCI_BUS(bdf);
  33 +       bdfs[1] = PCI_DEV(bdf);
  34 +       bdfs[2] = PCI_FUNC(bdf);
  35 +
  36 +       /*
  37 +        * One MediaTek PCIe Gen3 controller has only one port, where PCI bus 0 on
  38 +        * this port represents the controller itself and bus 1 represents the
  39 +        * external PCIe device. If multiple PCIe controllers are probed in U-Boot,
  40 +        * U-Boot will use bus numbers greater than 2 as input parameters. Therefore,
  41 +        * we should convert the BDF bus number to either 0 or 1 by subtracting the
  42 +        * offset by controller->seq_
  43 +        */
  44 +
  45 +       bdfs[0] = bdfs[0] - controller->seq_;
  46 +
  47 +       return PCI_BDF(bdfs[0], bdfs[1], bdfs[2]);
  48 +}
  49 +
  50  static void mtk_pcie_config_tlp_header(const struct udevice *bus,
  51                                        pci_dev_t devfn,
  52                                        int where, int size)
  53 @@ -91,6 +113,8 @@ static void mtk_pcie_config_tlp_header(c
  54         int bytes;
  55         u32 val;
  56
  57 +       devfn = convert_bdf(bus, devfn);
  58 +
  59         size = 1 << size;
  60         bytes = (GENMASK(size - 1, 0) & 0xf) << (where & 0x3);
  61