/************************************************************************** * arch/arm/src/a1x/a1x_lowputc.c * * Copyright (C) 2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * **************************************************************************/ /************************************************************************** * Included Files **************************************************************************/ #include #include #include #include #include "up_internal.h" #include "up_arch.h" #include "a1x_config.h" #include "chip/a1x_uart.h" #include "a1x_pio.h" /************************************************************************** * Pre-processor Definitions **************************************************************************/ /* Select UART parameters for the selected console */ #if defined(CONFIG_UART0_SERIAL_CONSOLE) # define CONSOLE_BASE A1X_UART0_VADDR # define CONSOLE_BAUD CONFIG_UART0_BAUD # define CONSOLE_BITS CONFIG_UART0_BITS # define CONSOLE_PARITY CONFIG_UART0_PARITY # define CONSOLE_2STOP CONFIG_UART0_2STOP #elif defined(CONFIG_UART1_SERIAL_CONSOLE) # define CONSOLE_BASE A1X_UART1_VADDR # define CONSOLE_BAUD CONFIG_UART1_BAUD # define CONSOLE_BITS CONFIG_UART1_BITS # define CONSOLE_PARITY CONFIG_UART1_PARITY # define CONSOLE_2STOP CONFIG_UART1_2STOP #elif defined(CONFIG_UART2_SERIAL_CONSOLE) # define CONSOLE_BASE A1X_UART2_VADDR # define CONSOLE_BAUD CONFIG_UART2_BAUD # define CONSOLE_BITS CONFIG_UART2_BITS # define CONSOLE_PARITY CONFIG_UART2_PARITY # define CONSOLE_2STOP CONFIG_UART2_2STOP #elif defined(CONFIG_UART3_SERIAL_CONSOLE) # define CONSOLE_BASE A1X_UART3_VADDR # define CONSOLE_BAUD CONFIG_UART3_BAUD # define CONSOLE_BITS CONFIG_UART3_BITS # define CONSOLE_PARITY CONFIG_UART3_PARITY # define CONSOLE_2STOP CONFIG_UART3_2STOP #elif defined(CONFIG_UART4_SERIAL_CONSOLE) # define CONSOLE_BASE A1X_UART4_VADDR # define CONSOLE_BAUD CONFIG_UART4_BAUD # define CONSOLE_BITS CONFIG_UART4_BITS # define CONSOLE_PARITY CONFIG_UART4_PARITY # define CONSOLE_2STOP CONFIG_UART4_2STOP #elif defined(CONFIG_UART5_SERIAL_CONSOLE) # define CONSOLE_BASE A1X_UART5_VADDR # define CONSOLE_BAUD CONFIG_UART5_BAUD # define CONSOLE_BITS CONFIG_UART5_BITS # define CONSOLE_PARITY CONFIG_UART5_PARITY # define CONSOLE_2STOP CONFIG_UART5_2STOP #elif defined(CONFIG_UART6_SERIAL_CONSOLE) # define CONSOLE_BASE A1X_UART6_VADDR # define CONSOLE_BAUD CONFIG_UART6_BAUD # define CONSOLE_BITS CONFIG_UART6_BITS # define CONSOLE_PARITY CONFIG_UART6_PARITY # define CONSOLE_2STOP CONFIG_UART6_2STOP #elif defined(CONFIG_UART7_SERIAL_CONSOLE) # define CONSOLE_BASE A1X_UART7_VADDR # define CONSOLE_BAUD CONFIG_UART7_BAUD # define CONSOLE_BITS CONFIG_UART7_BITS # define CONSOLE_PARITY CONFIG_UART7_PARITY # define CONSOLE_2STOP CONFIG_UART7_2STOP #elif defined(HAVE_SERIAL_CONSOLE) # error "No CONFIG_UARTn_SERIAL_CONSOLE Setting" #endif /* Get word length setting for the console */ #if CONSOLE_BITS == 5 # define CONSOLE_LCR_DLS UART_LCR_DLS_5BITS #elif CONSOLE_BITS == 6 # define CONSOLE_LCR_DLS UART_LCR_DLS_6BITS #elif CONSOLE_BITS == 7 # define CONSOLE_LCR_DLS UART_LCR_DLS_7BITS #elif CONSOLE_BITS == 8 # define CONSOLE_LCR_DLS UART_LCR_DLS_8BITS #elif defined(HAVE_SERIAL_CONSOLE) # error "Invalid CONFIG_UARTn_BITS setting for console " #endif /* Get parity setting for the console */ #if CONSOLE_PARITY == 0 # define CONSOLE_LCR_PAR 0 #elif CONSOLE_PARITY == 1 # define CONSOLE_LCR_PAR UART_LCR_PEN #elif CONSOLE_PARITY == 2 # define CONSOLE_LCR_PAR (UART_LCR_PEN | UART_LCR_EPS) #elif CONSOLE_PARITY == 3 #elif defined(HAVE_SERIAL_CONSOLE) # error "Invalid CONFIG_UARTn_PARITY setting for CONSOLE" #endif /* Get stop-bit setting for the console and UART0-3 */ #if CONSOLE_2STOP != 0 # define CONSOLE_LCR_STOP UART_LCR_STOP #else # define CONSOLE_LCR_STOP 0 #endif /* LCR and FCR values for the console */ #define CONSOLE_LCR_VALUE (CONSOLE_LCR_DLS | CONSOLE_LCR_PAR | CONSOLE_LCR_STOP) #define CONSOLE_FCR_VALUE (UART_FCR_RT_HALF | UART_FCR_XFIFOR |\ UART_FCR_RFIFOR | UART_FCR_FIFOE) /* SCLK is the UART input clock. * * Through experimentation, it has been found that the serial clock is * OSC24M */ #define A1X_SCLK 24000000 /* The output baud rate is equal to the serial clock (SCLK) frequency divided * by sixteen times the value of the baud rate divisor, as follows: * * baud rate = Fsclk / (16 * divisor). */ #define CONSOLE_DL (A1X_SCLK / (CONSOLE_BAUD << 4)) /************************************************************************** * Private Types **************************************************************************/ /************************************************************************** * Private Function Prototypes **************************************************************************/ /************************************************************************** * Global Variables **************************************************************************/ /************************************************************************** * Private Variables **************************************************************************/ /************************************************************************** * Private Functions **************************************************************************/ /************************************************************************** * Public Functions **************************************************************************/ /************************************************************************** * Name: up_lowputc * * Description: * Output one byte on the serial console * **************************************************************************/ void up_lowputc(char ch) { #if defined HAVE_UART_DEVICE && defined HAVE_SERIAL_CONSOLE /* Wait for the transmitter to be available */ while ((getreg32(CONSOLE_BASE+A1X_UART_LSR_OFFSET) & UART_LSR_THRE) == 0); /* Send the character */ putreg32((uint32_t)ch, CONSOLE_BASE+A1X_UART_THR_OFFSET); #endif } /************************************************************************** * Name: a1x_lowsetup * * Description: * This performs basic initialization of the UART used for the serial * console. Its purpose is to get the console output available as soon * as possible. * **************************************************************************/ void a1x_lowsetup(void) { #ifdef HAVE_UART_DEVICE /* Enable power and clocking to the UART peripheral */ #warning Missing logic /* Configure UART pins for the selected CONSOLE. If there are multiple * pin options for a given UART, the the applicable option must be * disambiguated in the board.h header file. */ #if defined(CONFIG_UART0_SERIAL_CONSOLE) a1x_pio_config(PIO_UART0_TX); a1x_pio_config(PIO_UART0_RX); #elif defined(CONFIG_UART1_SERIAL_CONSOLE) a1x_pio_config(PIO_UART1_TX); a1x_pio_config(PIO_UART1_RX); #elif defined(CONFIG_UART2_SERIAL_CONSOLE) a1x_pio_config(PIO_UART2_TX); a1x_pio_config(PIO_UART2_RX); #elif defined(CONFIG_UART3_SERIAL_CONSOLE) a1x_pio_config(PIO_UART3_TX); a1x_pio_config(PIO_UART3_RX); #elif defined(CONFIG_UART4_SERIAL_CONSOLE) a1x_pio_config(PIO_UART4_TX); a1x_pio_config(PIO_UART4_RX); #elif defined(CONFIG_UART5_SERIAL_CONSOLE) a1x_pio_config(PIO_UART5_TX); a1x_pio_config(PIO_UART5_RX); #elif defined(CONFIG_UART6_SERIAL_CONSOLE) a1x_pio_config(PIO_UART6_TX); a1x_pio_config(PIO_UART6_RX); #elif defined(CONFIG_UART7_SERIAL_CONSOLE) a1x_pio_config(PIO_UART7_TX); a1x_pio_config(PIO_UART7_RX); #endif /* Configure the console (only) */ #if defined(HAVE_SERIAL_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG) /* Clear fifos */ putreg32(UART_FCR_RFIFOR|UART_FCR_XFIFOR, CONSOLE_BASE+A1X_UART_FCR_OFFSET); /* Set trigger */ putreg32(UART_FCR_FIFOE|UART_FCR_RT_HALF, CONSOLE_BASE+A1X_UART_FCR_OFFSET); /* Set up the LCR and set DLAB=1 */ putreg32(CONSOLE_LCR_VALUE|UART_LCR_DLAB, CONSOLE_BASE+A1X_UART_LCR_OFFSET); /* Set the BAUD divisor */ putreg32(CONSOLE_DL >> 8, CONSOLE_BASE+A1X_UART_DLH_OFFSET); putreg32(CONSOLE_DL & 0xff, CONSOLE_BASE+A1X_UART_DLL_OFFSET); /* Clear DLAB */ putreg32(CONSOLE_LCR_VALUE, CONSOLE_BASE+A1X_UART_LCR_OFFSET); /* Configure the FIFOs */ putreg32(UART_FCR_RT_HALF|UART_FCR_XFIFOR|UART_FCR_RFIFOR|UART_FCR_FIFOE, CONSOLE_BASE+A1X_UART_FCR_OFFSET); #endif #endif /* HAVE_UART_DEVICE */ }