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/* SPDX-License-Identifier: GPL-2.0-only */
#include <device/mmio.h>
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <intelblocks/xdci.h>
#include <soc/pci_devs.h>
#include <timer.h>
#define DUAL_ROLE_CFG0 0x80d8
# define DRD_CONFIG_MASK (0x3 << 0)
# define DRD_CONFIG_DYNAMIC (0x0 << 0)
# define DRD_CONFIG_HOST (0x1 << 0)
# define DRD_CONFIG_DEVICE (0x2 << 0)
# define SW_VBUS_VALID_MASK (1 << 24)
# define SW_VBUS_DEASSERT_VALID (0 << 24)
# define SW_VBUS_ASSERT_VALID (1 << 24)
# define SW_IDPIN_EN_MASK (1 << 21)
# define SW_IDPIN_DIS (0 << 21)
# define SW_IDPIN_EN (1 << 21)
# define SW_IDPIN_MASK (1 << 20)
# define SW_IDPIN_HOST (0 << 20)
# define SW_IDPIN_DEVICE (1 << 20)
#define DUAL_ROLE_CFG1 0x80dc
# define DRD_MODE_MASK (1 << 29)
# define DRD_MODE_DEVICE (0 << 29)
# define DRD_MODE_HOST (1 << 29)
static void configure_host_mode_port0(struct device *dev)
{
uint32_t *cfg0;
uint32_t *cfg1;
const struct resource *res;
uint32_t reg;
struct stopwatch sw;
struct device *xdci_dev = PCH_DEV_XDCI;
/*
* Only default to host mode if the xdci device is present and
* enabled. If it's disabled assume the switch was already done
* in FSP.
*/
if (!dev->enabled || !xdci_dev->enabled || !xdci_can_enable())
return;
printk(BIOS_INFO, "Putting port 0 into host mode.\n");
res = find_resource(xdci_dev, PCI_BASE_ADDRESS_0);
cfg0 = (void *)(uintptr_t)(res->base + DUAL_ROLE_CFG0);
cfg1 = (void *)(uintptr_t)(res->base + DUAL_ROLE_CFG1);
reg = read32(cfg0);
reg &= ~(DRD_CONFIG_MASK | SW_IDPIN_EN_MASK | SW_IDPIN_MASK);
reg &= ~(SW_VBUS_VALID_MASK);
reg |= DRD_CONFIG_DYNAMIC | SW_IDPIN_EN | SW_IDPIN_HOST;
reg |= SW_VBUS_DEASSERT_VALID;
write32(cfg0, reg);
stopwatch_init_msecs_expire(&sw, 10);
/* Wait for the host mode status bit. */
while ((read32(cfg1) & DRD_MODE_MASK) != DRD_MODE_HOST) {
if (stopwatch_expired(&sw)) {
printk(BIOS_INFO, "Timed out waiting for host mode.\n");
break;
}
}
printk(BIOS_INFO, "XDCI port 0 host switch over took %lu ms\n",
stopwatch_duration_msecs(&sw));
}
void soc_xdci_init(struct device *dev)
{
configure_host_mode_port0(dev);
}
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