| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <acpi/acpigen.h> |
| #include <console/console.h> |
| #include <commonlib/helpers.h> |
| #include <device/mmio.h> |
| #include <amdblocks/gpio_banks.h> |
| #include <amdblocks/acpimmio.h> |
| #include <soc/southbridge.h> |
| #include <soc/gpio.h> |
| #include <soc/uart.h> |
| #include <types.h> |
| |
| static const struct _uart_info { |
| uintptr_t base; |
| struct soc_amd_gpio mux[2]; |
| } uart_info[] = { |
| [0] = { APU_UART0_BASE, { |
| PAD_NF(GPIO_138, UART0_TXD, PULL_NONE), |
| PAD_NF(GPIO_136, UART0_RXD, PULL_NONE), |
| } }, |
| [1] = { APU_UART1_BASE, { |
| PAD_NF(GPIO_143, UART1_TXD, PULL_NONE), |
| PAD_NF(GPIO_141, UART1_RXD, PULL_NONE), |
| } }, |
| [2] = { APU_UART2_BASE, { |
| PAD_NF(GPIO_137, UART2_TXD, PULL_NONE), |
| PAD_NF(GPIO_135, UART2_RXD, PULL_NONE), |
| } }, |
| [3] = { APU_UART3_BASE, { |
| PAD_NF(GPIO_140, UART3_TXD, PULL_NONE), |
| PAD_NF(GPIO_142, UART3_RXD, PULL_NONE), |
| } }, |
| }; |
| |
| uintptr_t get_uart_base(unsigned int idx) |
| { |
| if (idx >= ARRAY_SIZE(uart_info)) |
| return 0; |
| |
| return uart_info[idx].base; |
| } |
| |
| static bool get_uart_idx(uintptr_t base, unsigned int *idx) |
| { |
| for (unsigned int i = 0; i < ARRAY_SIZE(uart_info); i++) { |
| if (base == uart_info[i].base) { |
| *idx = i; |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| void clear_uart_legacy_config(void) |
| { |
| write16((void *)FCH_LEGACY_UART_DECODE, 0); |
| } |
| |
| void set_uart_legacy_config(unsigned int uart_idx, unsigned int range_idx) |
| { |
| uint16_t uart_legacy_decode; |
| uint8_t uart_map_offset; |
| |
| if (uart_idx >= ARRAY_SIZE(uart_info) || range_idx >= ARRAY_SIZE(uart_info)) |
| return; |
| |
| uart_legacy_decode = read16((void *)FCH_LEGACY_UART_DECODE); |
| /* Map uart_idx to io range_idx */ |
| uart_map_offset = range_idx * FCH_LEGACY_UART_MAP_SIZE + FCH_LEGACY_UART_MAP_SHIFT; |
| uart_legacy_decode &= ~(FCH_LEGACY_UART_MAP_MASK << uart_map_offset); |
| uart_legacy_decode |= uart_idx << uart_map_offset; |
| /* Enable io range */ |
| uart_legacy_decode |= 1 << range_idx; |
| write16((void *)FCH_LEGACY_UART_DECODE, uart_legacy_decode); |
| } |
| |
| static void enable_uart_legacy_decode(uintptr_t base) |
| { |
| unsigned int idx; |
| const uint8_t range_idx[ARRAY_SIZE(uart_info)] = { |
| FCH_LEGACY_UART_RANGE_3F8, |
| FCH_LEGACY_UART_RANGE_2F8, |
| FCH_LEGACY_UART_RANGE_3E8, |
| FCH_LEGACY_UART_RANGE_2E8, |
| }; |
| |
| if (get_uart_idx(base, &idx)) { |
| set_uart_legacy_config(idx, range_idx[idx]); |
| } |
| } |
| |
| void set_uart_config(unsigned int idx) |
| { |
| uint32_t uart_ctrl; |
| |
| if (idx >= ARRAY_SIZE(uart_info)) |
| return; |
| |
| program_gpios(uart_info[idx].mux, 2); |
| |
| if (CONFIG(PICASSO_UART_1_8MZ)) { |
| uart_ctrl = sm_pci_read32(SMB_UART_CONFIG); |
| uart_ctrl |= 1 << (SMB_UART_1_8M_SHIFT + idx); |
| sm_pci_write32(SMB_UART_CONFIG, uart_ctrl); |
| } |
| |
| } |
| |
| static const char *uart_acpi_name(const struct device *dev) |
| { |
| switch (dev->path.mmio.addr) { |
| case APU_UART0_BASE: |
| return "FUR0"; |
| case APU_UART1_BASE: |
| return "FUR1"; |
| case APU_UART2_BASE: |
| return "FUR2"; |
| case APU_UART3_BASE: |
| return "FUR3"; |
| default: |
| return NULL; |
| } |
| } |
| |
| /* 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; |
| |
| switch (dev->path.mmio.addr) { |
| case APU_UART0_BASE: |
| dev_id = FCH_AOAC_DEV_UART0; |
| break; |
| case APU_UART1_BASE: |
| dev_id = FCH_AOAC_DEV_UART1; |
| break; |
| case APU_UART2_BASE: |
| dev_id = FCH_AOAC_DEV_UART2; |
| break; |
| case APU_UART3_BASE: |
| dev_id = FCH_AOAC_DEV_UART3; |
| break; |
| default: |
| 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); |
| if (CONFIG(PICASSO_UART_LEGACY)) |
| enable_uart_legacy_decode(dev->path.mmio.addr); |
| } else { |
| power_off_aoac_device(dev_id); |
| } |
| } |
| |
| /* This gets called for both enabled and disabled devices. */ |
| static void uart_inject_ssdt(const struct device *dev) |
| { |
| acpigen_write_scope(acpi_device_path(dev)); |
| |
| acpigen_write_STA(acpi_device_status(dev)); |
| |
| acpigen_pop_len(); /* Scope */ |
| } |
| |
| struct device_operations picasso_uart_mmio_ops = { |
| .read_resources = noop_read_resources, |
| .set_resources = noop_set_resources, |
| .scan_bus = scan_static_bus, |
| .acpi_name = uart_acpi_name, |
| .enable = uart_enable, |
| .acpi_fill_ssdt = uart_inject_ssdt, |
| }; |