diff options
Diffstat (limited to 'drivers/uart/src/uart_pl011.c')
| -rw-r--r-- | drivers/uart/src/uart_pl011.c | 220 |
1 files changed, 0 insertions, 220 deletions
diff --git a/drivers/uart/src/uart_pl011.c b/drivers/uart/src/uart_pl011.c deleted file mode 100644 index 617ce5f..0000000 --- a/drivers/uart/src/uart_pl011.c +++ /dev/null @@ -1,220 +0,0 @@ -/* - * Copyright (c) 2019-2020 Arm Limited. All rights reserved. - * - * SPDX-License-Identifier: Apache-2.0 - * - * Licensed under the Apache License, Version 2.0 (the License); you may - * not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an AS IS BASIS, WITHOUT - * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -/* Basic PL011 UART driver */ - -#include "uart_config.h" -#include "uart_stdout.h" -#include <stdint.h> -#include <stdio.h> - -#define CNTLQ 0x11 -#define CNTLS 0x13 -#define DEL 0x7F -#define BACKSPACE 0x08 -#define CR 0x0D -#define LF 0x0A -#define ESC 0x1B - -/*****************************************************************************/ -/* UART Control Register Locations */ -/*****************************************************************************/ -#define UART0_DR *((volatile uint32_t *)UART0_BASE) -#define UART0_RSR *((volatile uint32_t *)(UART0_BASE + 0x04)) -#define UART0_ECR *((volatile uint32_t *)(UART0_BASE + 0x04)) -#define UART0_LCRH *((volatile uint32_t *)(UART0_BASE + 0x2C)) -#define UART0_LCRM *((volatile uint32_t *)(UART0_BASE + 0x28)) -#define UART0_LCRL *((volatile uint32_t *)(UART0_BASE + 0x24)) -#define UART0_CR *((volatile uint32_t *)(UART0_BASE + 0x30)) -#define UART0_FR *((volatile uint32_t *)(UART0_BASE + 0x18)) -#define UART0_IIR *((volatile uint32_t *)(UART0_BASE + 0x1C)) -#define UART0_ICR *((volatile uint32_t *)(UART0_BASE + 0x44)) - -/*****************************************************************************/ -/* Received Status Register - RSR */ -/*****************************************************************************/ -#define RSR_OVERRUN_ERROR 0x08 -#define RSR_BREAK_ERROR 0x04 -#define RSR_PARITY_ERROR 0x02 -#define RSR_FRAMING_ERROR 0x01 - -/*****************************************************************************/ -/* Line Control High Byte Register - LCRH */ -/*****************************************************************************/ -#define LCRH_WORD_LENGTH_8 0x60 -#define LCRH_WORD_LENGTH_7 0x40 -#define LCRH_WORD_LENGTH_6 0x20 -#define LCRH_WORD_LENGTH_5 0x00 -#define LCRH_FIFO_ENABLED 0x10 -#define LCRH_2_STOP_BITS 0x08 -#define LCRH_EVEN_PARITY 0x04 -#define LCRH_PARITY_ENABLE 0x02 -#define LCRH_SEND_BREAK 0x01 - -/*****************************************************************************/ -/* Line Control Medium Byte Register - LCRM */ -/* This register specifies the high byte of the Baud rate divisor */ -/*****************************************************************************/ -#define LCRM_BAUD_460800 0x00 -#define LCRM_BAUD_230400 0x00 -#define LCRM_BAUD_115200 0x00 -#define LCRM_BAUD_76800 0x00 -#define LCRM_BAUD_57600 0x00 -#define LCRM_BAUD_38400 0x00 -#define LCRM_BAUD_19200 0x00 -#define LCRM_BAUD_14400 0x00 -#define LCRM_BAUD_9600 0x00 -#define LCRM_BAUD_2400 0x01 -#define LCRM_BAUD_1200 0x02 - -/*****************************************************************************/ -/* Line Control Low Byte Register - LCRL */ -/* This register specifies the low byte of the Baud rate divisor */ -/*****************************************************************************/ -#define LCRL_BAUD_460800 0x01 -#define LCRL_BAUD_230400 0x03 -#define LCRL_BAUD_115200 0x07 -#define LCRL_BAUD_76800 0x0B -#define LCRL_BAUD_57600 0x0F -#define LCRL_BAUD_38400 0xC -#define LCRL_BAUD_19200 0x2F -#define LCRL_BAUD_14400 0x3F -#define LCRL_BAUD_9600 0x5F -#define LCRL_BAUD_2400 0x7F -#define LCRL_BAUD_1200 0xFF - -/*****************************************************************************/ -/* Control Register - CR */ -/*****************************************************************************/ -#define CR_LOOP_BACK_EN 0x80 -#define CR_TIMEOUT_INT_EN 0x40 -#define CR_TX_INT_ENABLE 0x100 -#define CR_RX_INT_ENABLE 0x200 -#define CR_MODSTAT_INT_EN 0x08 -#define CR_UART_ENABLE 0x01 - -/*****************************************************************************/ -/* Flag Register - FR */ -/*****************************************************************************/ -#define FR_TX_FIFO_EMPTY 0x80 -#define FR_RX_FIFO_FULL 0x40 -#define FR_TX_FIFO_FULL 0x20 -#define FR_RX_FIFO_EMPTY 0x10 -#define FR_BUSY 0x08 -#define FR_CARRIER_DETECT 0x04 -#define FR_SET_READY 0x02 -#define FR_CLEAR_TO_SEND 0x01 - -/*****************************************************************************/ -/* Interrupt Identification Register - IIR */ -/*****************************************************************************/ -#define IIR_RX_TIME_OUT 0x08 -#define IIR_TX 0x04 -#define IIR_RX 0x02 -#define IIR_MODEM 0x01 - -void UartStdOutInit(void) { - // Disable the serial port while setting the baud rate and word length - UART0_CR = 0; - - // Clear the receive status register - UART0_ECR = 0; - - // Set the correct baud rate and word length - UART0_LCRL = LCRL_BAUD_115200; - UART0_LCRM = LCRM_BAUD_115200; - UART0_LCRH = LCRH_WORD_LENGTH_8; - - // Explicitly disable FIFO's for char mode - UART0_LCRH &= ~LCRH_FIFO_ENABLED; - - // Enable UART0 (and RX/TX) without interrupts - UART0_CR = CR_UART_ENABLE | CR_TX_INT_ENABLE | CR_RX_INT_ENABLE; -} - -unsigned char UartPutc(unsigned char ch) { - if (ch == '\n') { - (void)UartPutc('\r'); - } - while (UART0_FR & FR_TX_FIFO_FULL) - ; - UART0_DR = ch; - - return ch; -} - -unsigned char UartGetc(void) { - unsigned char c; - while (UART0_FR & FR_RX_FIFO_EMPTY) - ; - c = UART0_DR; - if (c == '\r') { - c = '\n'; - } - - return c; -} - -// Get line from terminal -unsigned int GetLine(char *lp, unsigned int len) { - unsigned int cnt = 0; - char c; - - do { - c = UartGetc(); - switch (c) { - case CNTLQ: /* ignore Control S/Q */ - case CNTLS: - break; - case BACKSPACE: - case DEL: - if (cnt == 0) { - break; - } - cnt--; /* decrement count */ - lp--; /* and line pointer */ - UartPutc(0x08); /* echo backspace */ - UartPutc(' '); - UartPutc(0x08); - fflush(stdout); - break; - case ESC: - case 0: - *lp = 0; /* ESC - stop editing line */ - return 0; - case CR: /* CR - done, stop editing line */ - *lp = c; - lp++; /* increment line pointer */ - cnt++; /* and count */ - c = LF; - UartPutc(*lp = c); /* echo and store character */ - fflush(stdout); - lp++; /* increment line pointer */ - cnt++; /* and count */ - break; - default: - UartPutc(*lp = c); /* echo and store character */ - fflush(stdout); - lp++; /* increment line pointer */ - cnt++; /* and count */ - break; - } - } while (cnt < len - 2 && c != LF); /* check limit and CR */ - *lp = 0; /* mark end of string */ - return 1; -} |