| /* 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> |
| |
| 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; |
| } |
| |
| void clear_uart_legacy_config(void) |
| { |
| write16((void *)FCH_UART_LEGACY_DECODE, 0); |
| } |
| |
| void set_uart_config(unsigned int idx) |
| { |
| uint32_t uart_ctrl; |
| uint16_t uart_leg; |
| |
| 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); |
| } |
| |
| if (CONFIG(PICASSO_UART_LEGACY) && idx != 3) { |
| /* Force 3F8 if idx=0, 2F8 if idx=1, 3E8 if idx=2 */ |
| |
| /* TODO: make clearer once PPR is updated */ |
| uart_leg = (idx << 8) | (idx << 10) | (idx << 12) | (idx << 14); |
| if (idx == 0) |
| uart_leg |= 1 << FCH_LEGACY_3F8_SH; |
| else if (idx == 1) |
| uart_leg |= 1 << FCH_LEGACY_2F8_SH; |
| else if (idx == 2) |
| uart_leg |= 1 << FCH_LEGACY_3E8_SH; |
| |
| write16((void *)FCH_UART_LEGACY_DECODE, uart_leg); |
| } |
| } |
| |
| 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) |
| { |
| 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); |
| } 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, |
| }; |