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arm: rpi: Add function to trigger VL805's firmware load

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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 VideCore (the SoC's co-processor). Introduce the function that
informs VideCore that VL805 may need its firmware loaded.

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 2020-06-29 18:37:22 +02:00 committed by Matthias Brugger
parent 440bca81f0
commit d774da08dc
3 changed files with 66 additions and 0 deletions
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13
arch/arm/mach-bcm283x/include/mach/mbox.h
View file

@ -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.
*

7
arch/arm/mach-bcm283x/include/mach/msg.h
View file

@ -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);
#endif

46
arch/arm/mach-bcm283x/msg.c
View file

@ -7,6 +7,7 @@
#include <memalign.h>
#include <phys2bus.h>
#include <asm/arch/mbox.h>
#include <linux/delay.h>
struct msg_set_power_state {
struct bcm2835_mbox_hdr hdr;
@ -40,6 +41,12 @@ 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 +158,42 @@ 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;
}
udelay(200);
return 0;
}