diff options
Diffstat (limited to 'chip/mt_scp/mt8183/uart.c')
| -rw-r--r-- | chip/mt_scp/mt8183/uart.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/chip/mt_scp/mt8183/uart.c b/chip/mt_scp/mt8183/uart.c deleted file mode 100644 index 7907f9537d..0000000000 --- a/chip/mt_scp/mt8183/uart.c +++ /dev/null @@ -1,179 +0,0 @@ -/* Copyright 2018 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -/* SCP UART module */ - -#include "clock_chip.h" -#include "console.h" -#include "registers.h" -#include "serial_reg.h" -#include "system.h" -#include "task.h" -#include "uart.h" -#include "util.h" - -/* Console UART index */ -#define UARTN CONFIG_UART_CONSOLE -#define UART_IDLE_WAIT_US 500 - -static uint8_t uart_done, tx_started; - -int uart_init_done(void) -{ - /* - * TODO: AP UART support - * When access AP UART port, wait for AP peripheral clock - */ - return uart_done; -} - -void uart_tx_start(void) -{ - tx_started = 1; - - /* AP UART mode doesn't support interrupt */ - if (UARTN >= SCP_UART_COUNT) - return; - - if (UART_IER(UARTN) & UART_IER_THRI) - return; - disable_sleep(SLEEP_MASK_UART); - UART_IER(UARTN) |= UART_IER_THRI; -} - -void uart_tx_stop(void) -{ - tx_started = 0; - - /* AP UART mode doesn't support interrupt */ - if (UARTN >= SCP_UART_COUNT) - return; - - UART_IER(UARTN) &= ~UART_IER_THRI; - enable_sleep(SLEEP_MASK_UART); -} - -void uart_tx_flush(void) -{ - while (!(UART_LSR(UARTN) & UART_LSR_TEMT)) - ; -} - -int uart_tx_ready(void) -{ - /* Check xmit FIFO empty */ - return UART_LSR(UARTN) & UART_LSR_THRE; -} - -int uart_rx_available(void) -{ - /* Check rcvr data ready */ - return UART_LSR(UARTN) & UART_LSR_DR; -} - -void uart_write_char(char c) -{ - while (!uart_tx_ready()) - ; - - UART_DATA(UARTN) = c; -} - -int uart_read_char(void) -{ - return UART_DATA(UARTN); -} - -void uart_process(void) -{ - uart_process_input(); - uart_process_output(); -} - -#if (UARTN < SCP_UART_COUNT) -DECLARE_IRQ(UART_IRQ(UARTN), uart_interrupt, 2); -void uart_interrupt(void) -{ - uint8_t ier; - - task_clear_pending_irq(UART_IRQ(UARTN)); - uart_process(); - ier = UART_IER(UARTN); - UART_IER(UARTN) = 0; - UART_IER(UARTN) = ier; -} - -DECLARE_IRQ(UART_RX_IRQ(UARTN), uart_rx_interrupt, 2); -void uart_rx_interrupt(void) -{ - uint8_t ier; - - task_clear_pending_irq(UART_RX_IRQ(UARTN)); - SCP_INTC_UART_RX_IRQ &= ~BIT(UARTN); - uart_process(); - ier = UART_IER(UARTN); - UART_IER(UARTN) = 0; - UART_IER(UARTN) = ier; - SCP_INTC_UART_RX_IRQ |= 1 << UARTN; -} -#endif - -void uart_task(void) -{ -#if (UARTN >= SCP_UART_COUNT) - while (1) { - if (uart_rx_available() || tx_started) - uart_process(); - else - task_wait_event(UART_IDLE_WAIT_US); - } -#endif -} - -void uart_init(void) -{ - const uint32_t baud_rate = CONFIG_UART_BAUD_RATE; - /* - * UART clock source is set to ULPOSC1 / 10 below. - * - * TODO(b:134035444): We could get slightly more precise frequency by - * using the _measured_ ULPOSC1 frequency (instead of the target). - */ - const uint32_t uart_clock = ULPOSC1_CLOCK_MHZ * 1000 / 10 * 1000; - const uint32_t div = DIV_ROUND_NEAREST(uart_clock, baud_rate * 16); - - /* Init clock */ -#if UARTN == 0 - SCP_CLK_UART = CLK_UART_SEL_ULPOSC1_DIV10; - SCP_CLK_GATE |= CG_UART_M | CG_UART_B | CG_UART_RSTN; -#elif UARTN == 1 - SCP_CLK_UART = CLK_UART1_SEL_ULPOSC1_DIV10; - SCP_CLK_GATE |= CG_UART1_M | CG_UART1_B | CG_UART1_RSTN; -#endif - - /* Init and clear FIFO */ - UART_FCR(UARTN) = UART_FCR_ENABLE_FIFO - | UART_FCR_CLEAR_RCVR - | UART_FCR_CLEAR_XMIT; - /* Line control: parity none, 8 bit, 1 stop bit */ - UART_LCR(UARTN) = UART_LCR_WLEN8; - /* For baud rate <= 115200 */ - UART_HIGHSPEED(UARTN) = 0; - /* DLAB = 1 and update DLL DLH */ - UART_LCR(UARTN) |= UART_LCR_DLAB; - UART_DLL(UARTN) = div & 0xff; - UART_DLH(UARTN) = (div >> 8) & 0xff; - UART_LCR(UARTN) &= ~UART_LCR_DLAB; - UART_IER(UARTN) |= UART_IER_RDI; - -#if (UARTN < SCP_UART_COUNT) - task_enable_irq(UART_IRQ(UARTN)); - task_enable_irq(UART_RX_IRQ(UARTN)); - /* UART RX IRQ needs an extra enable */ - SCP_INTC_UART_RX_IRQ |= 1 << UARTN; -#endif - gpio_config_module(MODULE_UART, 1); - uart_done = 1; -} |