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From 333c4158645fe8aaacbd644bcdf7bc4c5b93cc26 Mon Sep 17 00:00:00 2001
From: Tim Gover <990920+timg236@users.noreply.github.com>
Date: Wed, 15 Jan 2020 11:26:19 +0000
Subject: [PATCH] usb: xhci: Raspberry Pi FW loader for VIA VL805
The VL805 FW may either be loaded from an SPI EEPROM or alternatively
loaded directly by the VideoCore firmware. A PCI reset will reset
the VL805 XHCI controller on the Raspberry Pi4 requiring the firmware
to be reloaded if an SPI EEPROM is not present.
Use a VideoCore mailbox to trigger the loading of the VL805
firmware (if necessary) after a PCI reset.
Signed-off-by: Tim Gover <tim.gover@raspberrypi.org>
---
drivers/usb/host/pci-quirks.c | 31 +++++++++++++++++++++-
include/soc/bcm2835/raspberrypi-firmware.h | 2 +-
2 files changed, 31 insertions(+), 2 deletions(-)
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -18,7 +18,7 @@
#include <linux/dmi.h>
#include "pci-quirks.h"
#include "xhci-ext-caps.h"
-
+#include <soc/bcm2835/raspberrypi-firmware.h>
#define UHCI_USBLEGSUP 0xc0 /* legacy support */
#define UHCI_USBCMD 0 /* command register */
@@ -634,6 +634,32 @@ EXPORT_SYMBOL_GPL(usb_amd_pt_check_port)
#endif /* CONFIG_PCI_DISABLE_COMMON_QUIRKS */
+/* The VL805 firmware may either be loaded from an EEPROM or by the BIOS into
+ * memory. If run from memory it must be reloaded after a PCI fundmental reset.
+ * The Raspberry Pi firmware acts as the BIOS in this case.
+ */
+static void usb_vl805_init(struct pci_dev *pdev)
+{
+#if IS_ENABLED(CONFIG_RASPBERRYPI_FIRMWARE)
+ struct rpi_firmware *fw;
+ struct {
+ u32 dev_addr;
+ } packet;
+ int ret;
+
+ fw = rpi_firmware_get(NULL);
+ if (!fw)
+ return;
+
+ packet.dev_addr = (pdev->bus->number << 20) |
+ (PCI_SLOT(pdev->devfn) << 15) | (PCI_FUNC(pdev->devfn) << 12);
+
+ dev_dbg(&pdev->dev, "RPI_FIRMWARE_NOTIFY_XHCI_RESET %x", packet.dev_addr);
+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET,
+ &packet, sizeof(packet));
+#endif
+}
+
#if IS_ENABLED(CONFIG_USB_UHCI_HCD)
/*
@@ -1222,6 +1248,9 @@ hc_init:
if (pdev->vendor == PCI_VENDOR_ID_INTEL)
usb_enable_intel_xhci_ports(pdev);
+ if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483)
+ usb_vl805_init(pdev);
+
op_reg_base = base + XHCI_HC_LENGTH(readl(base));
/* Wait for the host controller to be ready before writing any
--- a/include/soc/bcm2835/raspberrypi-firmware.h
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
@@ -95,7 +95,7 @@ enum rpi_firmware_property_tag {
RPI_FIRMWARE_SET_PERIPH_REG = 0x00038045,
RPI_FIRMWARE_GET_POE_HAT_VAL = 0x00030049,
RPI_FIRMWARE_SET_POE_HAT_VAL = 0x00030050,
-
+ RPI_FIRMWARE_NOTIFY_XHCI_RESET = 0x00030058,
/* Dispmanx TAGS */
RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE = 0x00040001,
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