Felix Held | 97e6125 | 2022-10-18 19:03:20 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
| 3 | #include <acpi/acpigen.h> |
| 4 | #include <amdblocks/aoac.h> |
| 5 | #include <amdblocks/gpio.h> |
| 6 | #include <amdblocks/uart.h> |
| 7 | #include <device/device.h> |
| 8 | |
| 9 | uintptr_t get_uart_base(unsigned int idx) |
| 10 | { |
| 11 | size_t num_ctrlrs; |
| 12 | const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs); |
| 13 | |
| 14 | if (idx >= num_ctrlrs) |
| 15 | return 0; |
| 16 | |
| 17 | return ctrlr[idx].base; |
| 18 | } |
| 19 | |
| 20 | static enum cb_err get_uart_idx(uintptr_t base, const struct soc_uart_ctrlr_info *ctrlr, |
| 21 | size_t num_ctrlrs, unsigned int *idx) |
| 22 | { |
| 23 | unsigned int i; |
| 24 | for (i = 0; i < num_ctrlrs; i++) { |
| 25 | if (base == ctrlr[i].base) { |
| 26 | *idx = i; |
| 27 | return CB_SUCCESS; |
| 28 | } |
| 29 | } |
| 30 | return CB_ERR; |
| 31 | } |
| 32 | |
| 33 | static enum cb_err get_uart_aoac_device(uintptr_t base, unsigned int *aoac_dev) |
| 34 | { |
| 35 | unsigned int idx; |
| 36 | size_t num_ctrlrs; |
| 37 | const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs); |
| 38 | |
| 39 | if (get_uart_idx(base, ctrlr, num_ctrlrs, &idx) == CB_ERR) |
| 40 | return CB_ERR; |
| 41 | |
| 42 | *aoac_dev = ctrlr[idx].aoac_device; |
| 43 | return CB_SUCCESS; |
| 44 | } |
| 45 | |
| 46 | void set_uart_config(unsigned int idx) |
| 47 | { |
| 48 | size_t num_ctrlrs; |
| 49 | const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs); |
| 50 | |
| 51 | if (idx >= num_ctrlrs) |
| 52 | return; |
| 53 | |
| 54 | gpio_configure_pads(ctrlr[idx].mux, 2); |
| 55 | } |
| 56 | |
| 57 | #if CONFIG(HAVE_ACPI_TABLES) |
| 58 | static const char *uart_acpi_name(const struct device *dev) |
| 59 | { |
| 60 | unsigned int idx; |
| 61 | size_t num_ctrlrs; |
| 62 | const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs); |
| 63 | |
| 64 | if (get_uart_idx(dev->path.mmio.addr, ctrlr, num_ctrlrs, &idx) == CB_SUCCESS) |
| 65 | return ctrlr[idx].acpi_name; |
| 66 | else |
| 67 | return NULL; |
| 68 | } |
| 69 | |
| 70 | /* This gets called for both enabled and disabled devices. */ |
| 71 | static void uart_inject_ssdt(const struct device *dev) |
| 72 | { |
| 73 | acpigen_write_scope(acpi_device_path(dev)); |
| 74 | |
| 75 | acpigen_write_STA(acpi_device_status(dev)); |
| 76 | |
| 77 | acpigen_pop_len(); /* Scope */ |
| 78 | } |
| 79 | #endif |
| 80 | |
| 81 | /* Even though this is called enable, it gets called for both enabled and disabled devices. */ |
| 82 | static void uart_enable(struct device *dev) |
| 83 | { |
| 84 | unsigned int dev_id; |
| 85 | |
| 86 | if (get_uart_aoac_device(dev->path.mmio.addr, &dev_id) == CB_ERR) { |
| 87 | printk(BIOS_ERR, "%s: Unknown device: %s\n", __func__, dev_path(dev)); |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | if (dev->enabled) { |
| 92 | power_on_aoac_device(dev_id); |
| 93 | wait_for_aoac_enabled(dev_id); |
| 94 | } else { |
| 95 | power_off_aoac_device(dev_id); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | static void uart_read_resources(struct device *dev) |
| 100 | { |
Arthur Heymans | fdc1b54 | 2023-07-05 12:08:32 +0200 | [diff] [blame^] | 101 | mmio_range(dev, 0, dev->path.mmio.addr, 4 * KiB); |
Felix Held | 97e6125 | 2022-10-18 19:03:20 +0200 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | struct device_operations amd_uart_mmio_ops = { |
| 105 | .read_resources = uart_read_resources, |
| 106 | .set_resources = noop_set_resources, |
| 107 | .scan_bus = scan_static_bus, |
| 108 | .enable = uart_enable, |
| 109 | #if CONFIG(HAVE_ACPI_TABLES) |
| 110 | .acpi_name = uart_acpi_name, |
| 111 | .acpi_fill_ssdt = uart_inject_ssdt, |
| 112 | #endif |
| 113 | }; |