early_usb_mrc.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/pci_ops.h>
#include <device/pci_def.h>
#include "pch.h"
 
#define PCH_EHCI1_TEMP_BAR0 0xe8000000
#define PCH_EHCI2_TEMP_BAR0 0xe8000400
 
/*
 * Setup USB controller MMIO BAR to prevent the
 * reference code from resetting the controller.
 *
 * The BAR will be re-assigned during device
 * enumeration so these are only temporary.
 */
void enable_usb_bar(void)
{
        pci_devfn_t usb0 = PCH_EHCI1_DEV;
        pci_devfn_t usb1 = PCH_EHCI2_DEV;
 
        /* USB Controller 1 */
        pci_write_config32(usb0, PCI_BASE_ADDRESS_0,
                           PCH_EHCI1_TEMP_BAR0);
        pci_or_config16(usb0, PCI_COMMAND, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
 
        /* USB Controller 2 */
        pci_write_config32(usb1, PCI_BASE_ADDRESS_0,
                           PCH_EHCI2_TEMP_BAR0);
        pci_or_config16(usb1, PCI_COMMAND, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
}