On Mon, Jan 20, 2025 at 8:01 AM Stanimir Varbanov <svarbanov@xxxxxxx> wrote:
>
> Add bare minimum amount of changes in order to support PCIe RC hardware
> IP found on RPi5. The PCIe controller on bcm2712 is based on bcm7712 and
> as such it inherits register offsets, perst, bridge_reset ops and inbound
> windows count.
> Although, the implementation for bcm2712 needs a workaround related to the
> control of the bridge_reset where turning off of the root port must not
> shutdown the bridge_reset and this must be avoided. To implement this
> workaround a quirks field is introduced in pcie_cfg_data struct.
>
> Signed-off-by: Stanimir Varbanov <svarbanov@xxxxxxx>
> Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
> ---
> v4 -> v5:
> - No changes.
>
> drivers/pci/controller/pcie-brcmstb.c | 25 +++++++++++++++++++++++--
> 1 file changed, 23 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index 59190d8be0fb..50607df34a66 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -234,10 +234,20 @@ struct inbound_win {
> u64 cpu_addr;
> };
>
> +/*
> + * The RESCAL block is tied to PCIe controller #1, regardless of the number of
> + * controllers, and turning off PCIe controller #1 prevents access to the RESCAL
> + * register blocks, therefore no other controller can access this register
> + * space, and depending upon the bus fabric we may get a timeout (UBUS/GISB),
> + * or a hang (AXI).
> + */
> +#define CFG_QUIRK_AVOID_BRIDGE_SHUTDOWN BIT(0)
> +
> struct pcie_cfg_data {
> const int *offsets;
> const enum pcie_soc_base soc_base;
> const bool has_phy;
> + const u32 quirks;
> u8 num_inbound_wins;
> int (*perst_set)(struct brcm_pcie *pcie, u32 val);
> int (*bridge_sw_init_set)(struct brcm_pcie *pcie, u32 val);
> @@ -1488,8 +1498,9 @@ static int brcm_pcie_turn_off(struct brcm_pcie *pcie)
> u32p_replace_bits(&tmp, 1, PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
> writel(tmp, base + HARD_DEBUG(pcie));
>
> - /* Shutdown PCIe bridge */
> - ret = pcie->bridge_sw_init_set(pcie, 1);
> + if (!(pcie->cfg->quirks & CFG_QUIRK_AVOID_BRIDGE_SHUTDOWN))
> + /* Shutdown PCIe bridge */
> + ret = pcie->cfg->bridge_sw_init_set(pcie, 1);
>
> return ret;
> }
> @@ -1699,6 +1710,15 @@ static const struct pcie_cfg_data bcm2711_cfg = {
> .num_inbound_wins = 3,
> };
>
> +static const struct pcie_cfg_data bcm2712_cfg = {
> + .offsets = pcie_offsets_bcm7712,
> + .soc_base = BCM7712,
> + .perst_set = brcm_pcie_perst_set_7278,
> + .bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
> + .quirks = CFG_QUIRK_AVOID_BRIDGE_SHUTDOWN,
> + .num_inbound_wins = 10,
> +};
> +
> static const struct pcie_cfg_data bcm4908_cfg = {
> .offsets = pcie_offsets,
> .soc_base = BCM4908,
> @@ -1750,6 +1770,7 @@ static const struct pcie_cfg_data bcm7712_cfg = {
>
> static const struct of_device_id brcm_pcie_match[] = {
> { .compatible = "brcm,bcm2711-pcie", .data = &bcm2711_cfg },
> + { .compatible = "brcm,bcm2712-pcie", .data = &bcm2712_cfg },
> { .compatible = "brcm,bcm4908-pcie", .data = &bcm4908_cfg },
> { .compatible = "brcm,bcm7211-pcie", .data = &generic_cfg },
> { .compatible = "brcm,bcm7216-pcie", .data = &bcm7216_cfg },
Reviewed-by: Jim Quinlan <james.quinlan@xxxxxxxxxxxx>
> --
> 2.47.0
>
