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pci: brcmstb: Cleanup controller state before handover

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Make sure we handover the PCIe controller in a clean state. Some of the
devices hanging from the PCIe bus might need to be properly reset
through #PERST in order for Linux to be able to initialize them.

This is specially important in order to properly initialize Raspberry Pi
4 B and 400's USB chip.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
This commit is contained in:
Nicolas Saenz Julienne 2021-01-14 16:49:01 +01:00 committed by Matthias Brugger
parent e3bbc1f74e
commit 85f3fddbcc
1 changed files with 20 additions and 0 deletions
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20
drivers/pci/pcie_brcmstb.c
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@ -579,6 +579,24 @@ static int brcm_pcie_probe(struct udevice *dev)
return 0;
}
static int brcm_pcie_remove(struct udevice *dev)
{
struct brcm_pcie *pcie = dev_get_priv(dev);
void __iomem *base = pcie->base;
/* Assert fundamental reset */
setbits_le32(base + PCIE_RGR1_SW_INIT_1, RGR1_SW_INIT_1_PERST_MASK);
/* Turn off SerDes */
setbits_le32(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG,
PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
/* Shutdown bridge */
setbits_le32(base + PCIE_RGR1_SW_INIT_1, RGR1_SW_INIT_1_INIT_MASK);
return 0;
}
static int brcm_pcie_of_to_plat(struct udevice *dev)
{
struct brcm_pcie *pcie = dev_get_priv(dev);
@ -618,6 +636,8 @@ U_BOOT_DRIVER(pcie_brcm_base) = {
.ops = &brcm_pcie_ops,
.of_match = brcm_pcie_ids,
.probe = brcm_pcie_probe,
.remove = brcm_pcie_remove,
.of_to_plat = brcm_pcie_of_to_plat,
.priv_auto = sizeof(struct brcm_pcie),
.flags = DM_FLAG_OS_PREPARE,
};