diff options
Diffstat (limited to 'chip/max32660/uart_chip.c')
| -rw-r--r-- | chip/max32660/uart_chip.c | 277 |
1 files changed, 0 insertions, 277 deletions
diff --git a/chip/max32660/uart_chip.c b/chip/max32660/uart_chip.c deleted file mode 100644 index c30a6ebd45..0000000000 --- a/chip/max32660/uart_chip.c +++ /dev/null @@ -1,277 +0,0 @@ -/* Copyright 2019 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. - */ - -/* MAX32660 Console UART Module for Chrome EC */ - -#include <stdint.h> -#include "system.h" -#include "task.h" -#include "uart.h" -#include "registers.h" -#include "tmr_regs.h" -#include "gpio_regs.h" -#include "common.h" -#include "gcr_regs.h" -#include "uart_regs.h" - -static int done_uart_init_yet; - -#ifndef UARTN -#define UARTN CONFIG_UART_HOST -#endif - -#if (UARTN == 0) -#define MXC_UART MXC_UART0 -#define EC_UART_IRQn EC_UART0_IRQn -#elif (UARTN == 1) -#define MXC_UART MXC_UART1 -#define EC_UART_IRQn EC_UART1_IRQn -#else -#error "MAX32660 supports only UART 0 or 1 for EC console" -#endif - -#define UART_BAUD 115200 - -#define UART_ER_IF \ - (MXC_F_UART_INT_FL_RX_FRAME_ERROR | \ - MXC_F_UART_INT_FL_RX_PARITY_ERROR | MXC_F_UART_INT_FL_RX_OVERRUN) - -#define UART_ER_IE \ - (MXC_F_UART_INT_EN_RX_FRAME_ERROR | \ - MXC_F_UART_INT_EN_RX_PARITY_ERROR | MXC_F_UART_INT_EN_RX_OVERRUN) - -#define UART_RX_IF (UART_ER_IF | MXC_F_UART_INT_FL_RX_FIFO_THRESH) - -#define UART_RX_IE (UART_ER_IE | MXC_F_UART_INT_EN_RX_FIFO_THRESH) - -#define UART_TX_IF \ - (UART_ER_IF | MXC_F_UART_INT_FL_TX_FIFO_ALMOST_EMPTY | \ - MXC_F_UART_INT_FL_TX_FIFO_THRESH) - -#define UART_TX_IE \ - (UART_ER_IE | MXC_F_UART_INT_EN_TX_FIFO_ALMOST_EMPTY | \ - MXC_F_UART_INT_EN_TX_FIFO_THRESH) - -#define UART_RX_THRESHOLD_LEVEL 1 - -/** - * Alternate clock rate. (7.3728MHz) */ -#define UART_ALTERNATE_CLOCK_HZ 7372800 - -/* ************************************************************************* */ -static unsigned int uart_number_write_available(mxc_uart_regs_t *uart) -{ - return MXC_UART_FIFO_DEPTH - - ((uart->status & MXC_F_UART_STATUS_TX_FIFO_CNT) >> - MXC_F_UART_STATUS_TX_FIFO_CNT_POS); -} - -/* ************************************************************************* */ -static unsigned int uart_number_read_available(mxc_uart_regs_t *uart) -{ - return ((uart->status & MXC_F_UART_STATUS_RX_FIFO_CNT) >> - MXC_F_UART_STATUS_RX_FIFO_CNT_POS); -} - -static void uartn_enable_tx_interrupt(int uart_num) -{ - // Enable the interrupts - MXC_UART_GET_UART(uart_num)->int_en |= UART_TX_IE; -} - -static void uartn_disable_tx_interrupt(int uart_num) -{ - // Disable the interrupts - MXC_UART_GET_UART(uart_num)->int_en &= ~UART_TX_IE; -} - -static int uartn_tx_in_progress(int uart_num) -{ - return ((MXC_UART_GET_UART(uart_num)->status & - (MXC_F_UART_STATUS_TX_BUSY)) != 0); -} - -static void uartn_tx_flush(int uart_num) -{ - while (uartn_tx_in_progress(uart_num)) { - } -} - -static int uartn_tx_ready(int uart_num) -{ - int avail; - avail = uart_number_write_available(MXC_UART_GET_UART(uart_num)); - /* True if the TX buffer is not completely full */ - return (avail != 0); -} - -static int uartn_rx_available(int uart_num) -{ - int avail; - /* True if the RX buffer is not completely empty. */ - avail = uart_number_read_available(MXC_UART_GET_UART(uart_num)); - return (avail != 0); -} - -static void uartn_write_char(int uart_num, char c) -{ - int avail; - mxc_uart_regs_t *uart; - - uart = MXC_UART_GET_UART(uart_num); - /* Refill the TX FIFO */ - avail = uart_number_write_available(uart); - - /* wait until there is room in the fifo */ - while (avail == 0) { - avail = uart_number_write_available(uart); - } - - /* stuff the fifo with the character */ - uart->fifo = c; -} - -static int uartn_read_char(int uart_num) -{ - int c; - c = MXC_UART_GET_UART(uart_num)->fifo; - return c; -} - -static void uartn_clear_interrupt_flags(int uart_num) -{ - uint32_t flags; - // Read and clear interrupts - // intst = MXC_UART_GET_UART(uart_num)->int_fl; - // MXC_UART_GET_UART(uart_num)->int_fl = ~intst; - - flags = MXC_UART_GET_UART(uart_num)->int_fl; - MXC_UART_GET_UART(uart_num)->int_fl = flags; -} - -static inline int uartn_is_rx_interrupt(int uart_num) -{ - return MXC_UART_GET_UART(uart_num)->int_fl & UART_RX_IF; -} - -static inline int uartn_is_tx_interrupt(int uart_num) -{ - return MXC_UART_GET_UART(uart_num)->int_fl & UART_TX_IF; -} - -int uart_init_done(void) -{ - return done_uart_init_yet; -} - -void uart_tx_start(void) -{ - /* Do not allow deep sleep while transmit in progress */ - disable_sleep(SLEEP_MASK_UART); - /* - * Re-enable the transmit interrupt, then forcibly trigger the - * interrupt. - */ - uartn_enable_tx_interrupt(UARTN); - task_trigger_irq(EC_UART_IRQn); -} - -void uart_tx_stop(void) -{ - uartn_disable_tx_interrupt(UARTN); - /* Re-allow deep sleep */ - enable_sleep(SLEEP_MASK_UART); -} - -int uart_tx_in_progress(void) -{ - return uartn_tx_in_progress(UARTN); -} - -void uart_tx_flush(void) -{ - uartn_tx_flush(UARTN); -} - -int uart_tx_ready(void) -{ - /* True if the TX buffer is not completely full */ - return uartn_tx_ready(UARTN); -} - -int uart_rx_available(void) -{ - /* True if the RX buffer is not completely empty. */ - return uartn_rx_available(UARTN); -} - -void uart_write_char(char c) -{ - /* write a character to the UART */ - uartn_write_char(UARTN, c); -} - -int uart_read_char(void) -{ - return uartn_read_char(UARTN); -} - -/** - * Interrupt handlers for UART - */ -void uart_rxtx_interrupt(void) -{ - /* Process the Console Input */ - uart_process_input(); - /* Process the Buffered Console Output */ - uart_process_output(); - uartn_clear_interrupt_flags(UARTN); -} -DECLARE_IRQ(EC_UART_IRQn, uart_rxtx_interrupt, 1); - -void uart_init(void) -{ - uint32_t flags; - uint32_t baud0 = 0, baud1 = 0, div; - int32_t factor = -1; - - /* Init the GPIO Port Mapping */ - gpio_config_module(MODULE_UART, 1); - - /* Drain FIFOs and enable UART and set configuration */ - MXC_UART->ctrl = (MXC_F_UART_CTRL_ENABLE | MXC_S_UART_CTRL_CHAR_SIZE_8 | 1); - - /* Set the baud rate */ - div = PeripheralClock / (UART_BAUD); // constant part of DIV (i.e. DIV - // * (Baudrate*factor_int)) - - do { - factor += 1; - baud0 = div >> (7 - factor); // divide by 128,64,32,16 to - // extract integer part - baud1 = ((div << factor) - - (baud0 << 7)); // subtract factor corrected div - - // integer parts - - } while ((baud0 == 0) && (factor < 4)); - - MXC_UART->baud0 = ((factor << MXC_F_UART_BAUD0_FACTOR_POS) | baud0); - MXC_UART->baud1 = baud1; - - MXC_UART->thresh_ctrl = UART_RX_THRESHOLD_LEVEL - << MXC_F_UART_THRESH_CTRL_RX_FIFO_THRESH_POS; - - /* Clear Interrupt Flags */ - flags = MXC_UART->int_fl; - MXC_UART->int_fl = flags; - - /* Enable the RX interrupts */ - MXC_UART->int_en |= UART_RX_IE; - - /* Enable the IRQ */ - task_enable_irq(EC_UART_IRQn); - /* Set a flag for the system that the UART has been initialized */ - done_uart_init_yet = 1; -} |