| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #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); |
| } |