diff options
Diffstat (limited to 'plat/mediatek/drivers/uart/uart.c')
| -rw-r--r-- | plat/mediatek/drivers/uart/uart.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/plat/mediatek/drivers/uart/uart.c b/plat/mediatek/drivers/uart/uart.c new file mode 100644 index 0000000..fdaa793 --- /dev/null +++ b/plat/mediatek/drivers/uart/uart.c @@ -0,0 +1,112 @@ +/* + * Copyright (c) 2020-2022, MediaTek Inc. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <lib/mmio.h> +#include <uart.h> + +static struct mt_uart uart_save_addr[DRV_SUPPORT_UART_PORTS]; + +static const uint32_t uart_base_addr[DRV_SUPPORT_UART_PORTS] = { + UART0_BASE, + UART1_BASE +}; + +void mt_uart_restore(void) +{ + int uart_idx = UART_PORT0; + struct mt_uart *uart; + unsigned long base; + + /* Must NOT print any debug log before UART restore */ + for (uart_idx = UART_PORT0; uart_idx < HW_SUPPORT_UART_PORTS; + uart_idx++) { + + uart = &uart_save_addr[uart_idx]; + base = uart->base; + + mmio_write_32(UART_LCR(base), UART_LCR_MODE_B); + mmio_write_32(UART_EFR(base), uart->registers.efr); + mmio_write_32(UART_LCR(base), uart->registers.lcr); + mmio_write_32(UART_FCR(base), uart->registers.fcr); + + /* baudrate */ + mmio_write_32(UART_HIGHSPEED(base), uart->registers.highspeed); + mmio_write_32(UART_FRACDIV_L(base), uart->registers.fracdiv_l); + mmio_write_32(UART_FRACDIV_M(base), uart->registers.fracdiv_m); + mmio_write_32(UART_LCR(base), + uart->registers.lcr | UART_LCR_DLAB); + mmio_write_32(UART_DLL(base), uart->registers.dll); + mmio_write_32(UART_DLH(base), uart->registers.dlh); + mmio_write_32(UART_LCR(base), uart->registers.lcr); + mmio_write_32(UART_SAMPLE_COUNT(base), + uart->registers.sample_count); + mmio_write_32(UART_SAMPLE_POINT(base), + uart->registers.sample_point); + mmio_write_32(UART_GUARD(base), uart->registers.guard); + + /* flow control */ + mmio_write_32(UART_ESCAPE_EN(base), uart->registers.escape_en); + mmio_write_32(UART_MCR(base), uart->registers.mcr); + mmio_write_32(UART_IER(base), uart->registers.ier); + mmio_write_32(UART_SCR(base), uart->registers.scr); + } +} + +void mt_uart_save(void) +{ + int uart_idx = UART_PORT0; + struct mt_uart *uart; + unsigned long base; + + for (uart_idx = UART_PORT0; uart_idx < HW_SUPPORT_UART_PORTS; + uart_idx++) { + + uart_save_addr[uart_idx].base = uart_base_addr[uart_idx]; + base = uart_base_addr[uart_idx]; + uart = &uart_save_addr[uart_idx]; + uart->registers.lcr = mmio_read_32(UART_LCR(base)); + + mmio_write_32(UART_LCR(base), UART_LCR_MODE_B); + uart->registers.efr = mmio_read_32(UART_EFR(base)); + mmio_write_32(UART_LCR(base), uart->registers.lcr); + uart->registers.fcr = mmio_read_32(UART_FCR_RD(base)); + + /* baudrate */ + uart->registers.highspeed = mmio_read_32(UART_HIGHSPEED(base)); + uart->registers.fracdiv_l = mmio_read_32(UART_FRACDIV_L(base)); + uart->registers.fracdiv_m = mmio_read_32(UART_FRACDIV_M(base)); + mmio_write_32(UART_LCR(base), + uart->registers.lcr | UART_LCR_DLAB); + uart->registers.dll = mmio_read_32(UART_DLL(base)); + uart->registers.dlh = mmio_read_32(UART_DLH(base)); + mmio_write_32(UART_LCR(base), uart->registers.lcr); + uart->registers.sample_count = mmio_read_32( + UART_SAMPLE_COUNT(base)); + uart->registers.sample_point = mmio_read_32( + UART_SAMPLE_POINT(base)); + uart->registers.guard = mmio_read_32(UART_GUARD(base)); + + /* flow control */ + uart->registers.escape_en = mmio_read_32(UART_ESCAPE_EN(base)); + uart->registers.mcr = mmio_read_32(UART_MCR(base)); + uart->registers.ier = mmio_read_32(UART_IER(base)); + uart->registers.scr = mmio_read_32(UART_SCR(base)); + } +} + +void mt_console_uart_cg(int on) +{ + if (on == 1) { + mmio_write_32(UART_CLOCK_GATE_CLR, UART0_CLOCK_GATE_BIT); + } else { + mmio_write_32(UART_CLOCK_GATE_SET, UART0_CLOCK_GATE_BIT); + } +} + +uint32_t mt_console_uart_cg_status(void) +{ + return mmio_read_32(UART_CLOCK_GATE_STA) & UART0_CLOCK_GATE_BIT; +} |