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pci: mediatek: add support for multiple ports in mediatek pcie gen3 driver

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One MediaTek PCIe Gen3 controller has only one port, where PCI bus 0
on this port represents the controller itself and bus 1 represents
the external PCIe device.

If multiple PCIe controllers are probed in U-Boot, U-Boot will use
bus numbers greater than 2 as input parameters. Therefore, we should
convert the BDF bus number to either 0 or 1 by subtracting the
offset by controller->seq_.

Signed-off-by: Sam Shih <sam.shih@mediatek.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
This commit is contained in:
Weijie Gao 2025-01-17 17:18:11 +08:00 • committed by Tom Rini
parent 7071ba2658
commit dfbadb86b3
1 changed files with 24 additions and 0 deletions
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24
drivers/pci/pcie_mediatek_gen3.c
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@ -83,6 +83,28 @@ struct mtk_pcie {
struct phy phy; struct phy phy;
}; };
static pci_dev_t convert_bdf(const struct udevice *controller, pci_dev_t bdf)
{
int bdfs[3];
bdfs[0] = PCI_BUS(bdf);
bdfs[1] = PCI_DEV(bdf);
bdfs[2] = PCI_FUNC(bdf);
/*
* One MediaTek PCIe Gen3 controller has only one port, where PCI bus 0 on
* this port represents the controller itself and bus 1 represents the
* external PCIe device. If multiple PCIe controllers are probed in U-Boot,
* U-Boot will use bus numbers greater than 2 as input parameters. Therefore,
* we should convert the BDF bus number to either 0 or 1 by subtracting the
* offset by controller->seq_
*/
bdfs[0] = bdfs[0] - controller->seq_;
return PCI_BDF(bdfs[0], bdfs[1], bdfs[2]);
}
static void mtk_pcie_config_tlp_header(const struct udevice *bus, static void mtk_pcie_config_tlp_header(const struct udevice *bus,
pci_dev_t devfn, pci_dev_t devfn,
int where, int size) int where, int size)
@ -91,6 +113,8 @@ static void mtk_pcie_config_tlp_header(const struct udevice *bus,
int bytes; int bytes;
u32 val; u32 val;
devfn = convert_bdf(bus, devfn);
size = 1 << size; size = 1 << size;
bytes = (GENMASK(size - 1, 0) & 0xf) << (where & 0x3); bytes = (GENMASK(size - 1, 0) & 0xf) << (where & 0x3);