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