> From: Nicolas Saenz Julienne <[email protected]>
> Date: Thu, 30 Apr 2020 15:04:32 +0200
>
> On the Raspberry Pi 4, after a PCI reset, VL805's (a xHCI chip) firmware
> may either be loaded directly from an EEPROM or, if not present, by the
> SoC's VideoCore (the SoC's co-processor). Introduce the function that
> informs VideoCore that VL805 may need its firmware loaded.
>
> Signed-off-by: Nicolas Saenz Julienne <[email protected]>
>
> ---
> Changes since v1:
> - Rename function so it's not mistaken with regular firmware loading
>
> arch/arm/mach-bcm283x/include/mach/mbox.h | 13 +++++++
> arch/arm/mach-bcm283x/include/mach/msg.h | 7 ++++
> arch/arm/mach-bcm283x/msg.c | 43 +++++++++++++++++++++++
> 3 files changed, 63 insertions(+)
>
> diff --git a/arch/arm/mach-bcm283x/include/mach/mbox.h
> b/arch/arm/mach-bcm283x/include/mach/mbox.h
> index 60e226ce1d..2ae2d3d97c 100644
> --- a/arch/arm/mach-bcm283x/include/mach/mbox.h
> +++ b/arch/arm/mach-bcm283x/include/mach/mbox.h
> @@ -491,6 +491,19 @@ struct bcm2835_mbox_tag_set_palette {
> } body;
> };
>
> +#define BCM2835_MBOX_TAG_NOTIFY_XHCI_RESET 0x00030058
> +
> +struct bcm2835_mbox_tag_pci_dev_addr {
> + struct bcm2835_mbox_tag_hdr tag_hdr;
> + union {
> + struct {
> + u32 dev_addr;
> + } req;
> + struct {
> + } resp;
> + } body;
> +};
> +
> /*
> * Pass a raw u32 message to the VC, and receive a raw u32 back.
> *
> diff --git a/arch/arm/mach-bcm283x/include/mach/msg.h
> b/arch/arm/mach-bcm283x/include/mach/msg.h
> index 4afb08631b..e45c1bf010 100644
> --- a/arch/arm/mach-bcm283x/include/mach/msg.h
> +++ b/arch/arm/mach-bcm283x/include/mach/msg.h
> @@ -48,4 +48,11 @@ int bcm2835_set_video_params(int *widthp, int *heightp,
> int depth_bpp,
> int pixel_order, int alpha_mode, ulong *fb_basep,
> ulong *fb_sizep, int *pitchp);
>
> +/**
> + * bcm2711_load_vl805_firmware() - get vl805's firmware loaded
> + *
> + * @return 0 if OK, -EIO on error
> + */
> +int bcm2711_notify_vl805_reset(void);
Now the comment and function prototype don't agree :(.
> +
> #endif
> diff --git a/arch/arm/mach-bcm283x/msg.c b/arch/arm/mach-bcm283x/msg.c
> index 94b75283f8..a338190d33 100644
> --- a/arch/arm/mach-bcm283x/msg.c
> +++ b/arch/arm/mach-bcm283x/msg.c
> @@ -40,6 +40,12 @@ struct msg_setup {
> u32 end_tag;
> };
>
> +struct msg_notify_vl805_reset {
> + struct bcm2835_mbox_hdr hdr;
> + struct bcm2835_mbox_tag_pci_dev_addr dev_addr;
> + u32 end_tag;
> +};
> +
> int bcm2835_power_on_module(u32 module)
> {
> ALLOC_CACHE_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1);
> @@ -151,3 +157,40 @@ int bcm2835_set_video_params(int *widthp, int *heightp,
> int depth_bpp,
>
> return 0;
> }
> +
> +/*
> + * On the Raspberry Pi 4, after a PCI reset, VL805's (the xHCI chip) firmware
> + * may either be loaded directly from an EEPROM or, if not present, by the
> + * SoC's VideoCore. This informs VideoCore that VL805 needs its firmware
> + * loaded.
> + */
> +int bcm2711_notify_vl805_reset(void)
> +{
> + ALLOC_CACHE_ALIGN_BUFFER(struct msg_notify_vl805_reset,
> + msg_notify_vl805_reset, 1);
> + int ret;
> +
> + BCM2835_MBOX_INIT_HDR(msg_notify_vl805_reset);
> + BCM2835_MBOX_INIT_TAG(&msg_notify_vl805_reset->dev_addr,
> + NOTIFY_XHCI_RESET);
> +
> + /*
> + * The pci device address is expected like this:
> + *
> + * PCI_BUS << 20 | PCI_SLOT << 15 | PCI_FUNC << 12
> + *
> + * But since RPi4's PCIe setup is hardwired, we know the address in
> + * advance.
> + */
> + msg_notify_vl805_reset->dev_addr.body.req.dev_addr = 0x100000;
> +
> + ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN,
> + &msg_notify_vl805_reset->hdr);
> + if (ret) {
> + printf("bcm2711: Faild to load vl805's firmware, %d\n", ret);
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> --
> 2.26.2
>
>
