early_usb.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"
 
/* HCD_INDEX == 2 selects 0:1a.0 (PCH_EHCI2), any other index
 * selects 0:1d.0 (PCH_EHCI1) for usbdebug use.
 */
#if CONFIG_USBDEBUG_HCD_INDEX != 2
#define PCH_EHCI1_TEMP_BAR0 CONFIG_EHCI_BAR
#define PCH_EHCI2_TEMP_BAR0 (PCH_EHCI1_TEMP_BAR0 + 0x400)
#else
#define PCH_EHCI2_TEMP_BAR0 CONFIG_EHCI_BAR
#define PCH_EHCI1_TEMP_BAR0 (PCH_EHCI2_TEMP_BAR0 + 0x400)
#endif
 
/*
 * 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.
 */
static void enable_usb_bar_on_device(pci_devfn_t dev, u32 bar)
{
        pci_write_config32(dev, PCI_BASE_ADDRESS_0, bar);
        pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
}
 
void enable_usb_bar(void)
{
        enable_usb_bar_on_device(PCH_EHCI1_DEV, PCH_EHCI1_TEMP_BAR0);
        if (!pch_is_lp())
                enable_usb_bar_on_device(PCH_EHCI2_DEV, PCH_EHCI2_TEMP_BAR0);
}