| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| /* |
| * The sole purpose of this driver is to avoid BAR to be changed during |
| * resource allocation. Since configuration space is just 32 bytes it |
| * shouldn't cause any fragmentation. |
| */ |
| |
| #include <console/uart.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <device/pci_ops.h> |
| #include <device/pci_ids.h> |
| #include <soc/pci_devs.h> |
| #include <console/console.h> |
| #include <soc/uart.h> |
| #include <fsp/api.h> |
| |
| static void dnv_ns_uart_read_resources(struct device *dev) |
| { |
| /* read resources to be visible in the log*/ |
| pci_dev_read_resources(dev); |
| if (!CONFIG(LEGACY_UART_MODE)) |
| return; |
| struct resource *res = find_resource(dev, PCI_BASE_ADDRESS_0); |
| if (res == NULL) |
| return; |
| res->size = 0x8; |
| res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED | IORESOURCE_FIXED; |
| /* Do not configure membar */ |
| res = find_resource(dev, PCI_BASE_ADDRESS_1); |
| if (res != NULL) |
| res->flags = 0; |
| compact_resources(dev); |
| |
| } |
| |
| static struct device_operations uart_ops = { |
| .read_resources = dnv_ns_uart_read_resources, |
| .set_resources = pci_dev_set_resources, |
| .enable_resources = pci_dev_enable_resources, |
| .init = pci_dev_init, |
| }; |
| |
| static const struct pci_driver uart_driver __pci_driver = { |
| .ops = &uart_ops, |
| .vendor = PCI_VENDOR_ID_INTEL, |
| .device = PCI_DEVICE_ID_INTEL_DENVERTON_HSUART |
| }; |
| |
| static void hide_hsuarts(void) |
| { |
| int i; |
| printk(BIOS_DEBUG, "HIDING HSUARTs.\n"); |
| /* There is a hardware requirement to hide functions starting from the |
| last one. */ |
| for (i = DENVERTON_UARTS_TO_INI - 1; i >= 0; i--) { |
| struct device *uart_dev; |
| uart_dev = pcidev_on_root(HSUART_DEV, i); |
| if (uart_dev == NULL) |
| continue; |
| pci_or_config32(uart_dev, PCI_FUNC_RDCFG_HIDE, 1); |
| } |
| } |
| |
| /* Hide HSUART PCI device very last when FSP no longer needs it */ |
| void platform_fsp_notify_status(enum fsp_notify_phase phase) |
| { |
| if (phase != END_OF_FIRMWARE) |
| return; |
| if (CONFIG(LEGACY_UART_MODE)) |
| hide_hsuarts(); |
| } |