324 lines
8.8 KiB
C
324 lines
8.8 KiB
C
/****************************************************************************
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* arch/arm/src/cxd56xx/cxd56_uart0.c
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*
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* Copyright 2018 Sony Semiconductor Solutions Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name of Sony Semiconductor Solutions Corporation nor
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* the names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/irq.h>
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#include <nuttx/semaphore.h>
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#include <queue.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <debug.h>
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#include <errno.h>
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#include "up_arch.h"
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#include "chip.h"
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#include "cxd56_pinconfig.h"
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#ifdef CONFIG_CXD56_UART0
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#include <arch/chip/uart0.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_CXD56_UART0_BAUD
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# define CONFIG_CXD56_UART0_BAUD 921600
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#endif
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#ifndef CONFIG_CXD56_UART0_BITS
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# define CONFIG_CXD56_UART0_BITS 8
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#endif
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#ifndef CONFIG_CXD56_UART0_PARITY
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# define CONFIG_CXD56_UART0_PARITY 0
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#endif
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#ifndef CONFIG_CXD56_UART0_2STOP
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# define CONFIG_CXD56_UART0_2STOP 0
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#endif
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int uart0_open(FAR struct file *filep);
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static int uart0_close(FAR struct file *filep);
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static ssize_t uart0_read(FAR struct file *filep,
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FAR char *buffer, size_t len);
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static ssize_t uart0_write(FAR struct file *filep,
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FAR const char *buffer, size_t len);
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static int uart0_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
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static int uart0_semtake(sem_t *id);
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static void uart0_semgive(sem_t *id);
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/****************************************************************************
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* FarAPI prototypes
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****************************************************************************/
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int PD_UartInit(int ch);
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int PD_UartUninit(int ch);
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int PD_UartConfiguration(int ch, int baudrate, int databits,
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int parity, int stopbit, int flowctrl);
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int PD_UartEnable(int ch);
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int PD_UartDisable(int ch);
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int PD_UartReceive(int ch, void *buf, int size, int leave);
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int PD_UartSend(int ch, void *buf, int size, int leave);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_uart0fops =
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{
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.open = uart0_open,
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.close = uart0_close,
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.read = uart0_read,
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.write = uart0_write,
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.seek = 0,
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.ioctl = uart0_ioctl,
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};
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static sem_t g_lock;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: uart0_semtake
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****************************************************************************/
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static int uart0_semtake(sem_t *id)
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{
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return nxsem_wait_uninterruptible(id);
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}
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/****************************************************************************
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* Name: uart0_semgive
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****************************************************************************/
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static void uart0_semgive(sem_t *id)
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{
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nxsem_post(id);
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}
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/****************************************************************************
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* Name: uart0_open
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****************************************************************************/
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static int uart0_open(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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int flowctl;
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int bits;
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int stop;
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int ret;
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if (inode->i_crefs > 1)
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{
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return OK;
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}
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ret = PD_UartInit(0);
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if (ret < 0)
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{
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set_errno(EFAULT);
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return ERROR;
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}
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/* 0 = 5bit, 1 = 6bit, 2 = 7bit, 3 = 8bit */
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bits = CONFIG_CXD56_UART0_BITS - 5;
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/* 1 = 1 stop, 2 = 2 stop bit */
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stop = CONFIG_CXD56_UART0_2STOP + 1;
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/* Enable UART0 pin configuration */
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#ifdef CONFIG_UART0_FLOWCONTROL
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flowctl = 1;
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CXD56_PIN_CONFIGS(PINCONFS_SPI2_UART0);
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#else
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flowctl = 0;
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CXD56_PIN_CONFIGS(PINCONFS_SPI2A_UART0);
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#endif
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ret = PD_UartConfiguration(0, CONFIG_CXD56_UART0_BAUD,
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bits,
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CONFIG_CXD56_UART0_PARITY,
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stop, flowctl);
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if (ret < 0)
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{
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PD_UartUninit(0);
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set_errno(EINVAL);
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return ERROR;
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}
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ret = PD_UartEnable(0);
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if (ret < 0)
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{
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PD_UartUninit(0);
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set_errno(EFAULT);
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return ERROR;
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}
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return OK;
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}
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/****************************************************************************
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* Name: uart0_close
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****************************************************************************/
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static int uart0_close(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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if (inode->i_crefs == 1)
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{
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PD_UartDisable(0);
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PD_UartUninit(0);
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/* Disable UART0 pin by changing Hi-Z GPIO */
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#ifdef CONFIG_UART0_FLOWCONTROL
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CXD56_PIN_CONFIGS(PINCONFS_SPI2_GPIO);
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#else
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CXD56_PIN_CONFIGS(PINCONFS_SPI2A_GPIO);
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#endif
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}
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return 0;
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}
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/****************************************************************************
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* Name: uart0_read
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****************************************************************************/
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static ssize_t uart0_read(FAR struct file *filep,
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FAR char *buffer, size_t len)
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{
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int ret;
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uart0_semtake(&g_lock);
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/* Always blocking */
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ret = PD_UartReceive(0, buffer, len, 0);
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uart0_semgive(&g_lock);
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if (ret < 0)
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{
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set_errno(-ret);
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ret = 0; /* Receive no data */
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}
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return (ssize_t)ret;
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}
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/****************************************************************************
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* Name: uart0_write
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****************************************************************************/
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static ssize_t uart0_write(FAR struct file *filep,
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FAR const char *buffer, size_t len)
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{
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int ret;
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uart0_semtake(&g_lock);
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/* Always blocking */
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ret = PD_UartSend(0, (FAR void *)buffer, len, 0);
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uart0_semgive(&g_lock);
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if (ret < 0)
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{
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set_errno(-ret);
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ret = 0;
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}
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return (ssize_t)ret;
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}
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/****************************************************************************
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* Name: uart0_ioctl
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****************************************************************************/
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static int uart0_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
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{
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return -ENOTTY;
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}
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/****************************************************************************
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* Name: cxd56_uart0initialize
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****************************************************************************/
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int cxd56_uart0initialize(FAR const char *devname)
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{
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int ret;
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nxsem_init(&g_lock, 0, 1);
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ret = register_driver(devname, &g_uart0fops, 0666, NULL);
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if (ret != 0)
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{
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return ERROR;
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}
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return OK;
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}
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/****************************************************************************
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* Name: cxd56_uart0uninitialize
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****************************************************************************/
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void cxd56_uart0uninitialize(FAR const char *devname)
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{
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unregister_driver(devname);
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nxsem_destroy(&g_lock);
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}
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#endif /* CONFIG_CXD56_UART0 */
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