| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <acpi/acpigen.h> |
| #include <amdblocks/aoac.h> |
| #include <amdblocks/gpio.h> |
| #include <amdblocks/uart.h> |
| #include <device/device.h> |
| |
| uintptr_t get_uart_base(unsigned int idx) |
| { |
| size_t num_ctrlrs; |
| const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs); |
| |
| if (idx >= num_ctrlrs) |
| return 0; |
| |
| return ctrlr[idx].base; |
| } |
| |
| static enum cb_err get_uart_idx(uintptr_t base, const struct soc_uart_ctrlr_info *ctrlr, |
| size_t num_ctrlrs, unsigned int *idx) |
| { |
| unsigned int i; |
| for (i = 0; i < num_ctrlrs; i++) { |
| if (base == ctrlr[i].base) { |
| *idx = i; |
| return CB_SUCCESS; |
| } |
| } |
| return CB_ERR; |
| } |
| |
| static enum cb_err get_uart_aoac_device(uintptr_t base, unsigned int *aoac_dev) |
| { |
| unsigned int idx; |
| size_t num_ctrlrs; |
| const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs); |
| |
| if (get_uart_idx(base, ctrlr, num_ctrlrs, &idx) == CB_ERR) |
| return CB_ERR; |
| |
| *aoac_dev = ctrlr[idx].aoac_device; |
| return CB_SUCCESS; |
| } |
| |
| void set_uart_config(unsigned int idx) |
| { |
| size_t num_ctrlrs; |
| const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs); |
| |
| if (idx >= num_ctrlrs) |
| return; |
| |
| gpio_configure_pads(ctrlr[idx].mux, 2); |
| } |
| |
| #if CONFIG(HAVE_ACPI_TABLES) |
| static const char *uart_acpi_name(const struct device *dev) |
| { |
| unsigned int idx; |
| size_t num_ctrlrs; |
| const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs); |
| |
| if (get_uart_idx(dev->path.mmio.addr, ctrlr, num_ctrlrs, &idx) == CB_SUCCESS) |
| return ctrlr[idx].acpi_name; |
| else |
| return NULL; |
| } |
| |
| /* This gets called for enabled devices only. */ |
| static void uart_inject_ssdt(const struct device *dev) |
| { |
| acpigen_write_scope(acpi_device_path(dev)); |
| acpigen_write_store_int_to_namestr(acpi_device_status(dev), "STAT"); |
| acpigen_pop_len(); /* Scope */ |
| } |
| #endif |
| |
| /* Even though this is called enable, it gets called for both enabled and disabled devices. */ |
| static void uart_enable(struct device *dev) |
| { |
| unsigned int dev_id; |
| |
| if (get_uart_aoac_device(dev->path.mmio.addr, &dev_id) == CB_ERR) { |
| printk(BIOS_ERR, "%s: Unknown device: %s\n", __func__, dev_path(dev)); |
| return; |
| } |
| |
| if (dev->enabled) { |
| power_on_aoac_device(dev_id); |
| wait_for_aoac_enabled(dev_id); |
| } else { |
| power_off_aoac_device(dev_id); |
| } |
| } |
| |
| static void uart_read_resources(struct device *dev) |
| { |
| mmio_range(dev, 0, dev->path.mmio.addr, 4 * KiB); |
| } |
| |
| struct device_operations amd_uart_mmio_ops = { |
| .read_resources = uart_read_resources, |
| .set_resources = noop_set_resources, |
| .scan_bus = scan_static_bus, |
| .enable = uart_enable, |
| #if CONFIG(HAVE_ACPI_TABLES) |
| .acpi_name = uart_acpi_name, |
| .acpi_fill_ssdt = uart_inject_ssdt, |
| #endif |
| }; |