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nuttx-bb/nuttx/arch/arm/src/str71x/str71x_serial.c

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/****************************************************************************
* arch/arm/src/str71x/str71x_serial.c
*
* Copyright (C) 2008-2009, 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <semaphore.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/serial.h>
#include <arch/serial.h>
#include "chip.h"
#include "up_arch.h"
#include "up_internal.h"
#include "os_internal.h"
#include "str71x_internal.h"
/****************************************************************************
* Pre-procesor Definitions
****************************************************************************/
/* Some sanity checks *******************************************************/
/* Is there a UART enabled? */
#if !defined(CONFIG_STR71X_UART0) && !defined(CONFIG_STR71X_UART1) && \
!defined(CONFIG_STR71X_UART2) && !defined(CONFIG_STR71X_UART3)
# error "No UARTs enabled"
#endif
/* Is there a serial console? */
#if defined(CONFIG_UART0_SERIAL_CONSOLE) || defined(CONFIG_UART1_SERIAL_CONSOLE) ||\
defined(CONFIG_UART2_SERIAL_CONSOLE) || defined(CONFIG_UART3_SERIAL_CONSOLE)
# define HAVE_CONSOLE 1
#else
# undef HAVE_CONSOLE
#endif
/* Did the user select a priority? */
#ifndef CONFIG_UART_PRI
# define CONFIG_UART_PRI 1
#elif CONFIG_UART_PRI <= 1 || CONFIG_UART_PRI > 15
# error "CONFIG_UART_PRI is out of range"
#endif
/* If we are not using the serial driver for the console, then we
* still must provide some minimal implementation of up_putc().
*/
#ifdef USE_SERIALDRIVER
/* Which UART with be tty0/console and which tty1? tty2? tty3? */
#if defined(CONFIG_UART0_SERIAL_CONSOLE) || !defined(HAVE_CONSOLE)
# ifdef HAVE_CONSOLE
# ifndef CONFIG_STR71X_UART0
# error "UART0 not selected, cannot be console"
# endif
# define CONSOLE_DEV g_uart0port /* UART0 is console */
# endif
# define TTYS0_DEV g_uart0port /* UART0 is tty0 */
# if CONFIG_STR71X_UART1
# define TTYS1_DEV g_uart1port /* UART1 is tty1 */
# if CONFIG_STR71X_UART2
# define TTYS2_DEV g_uart2port /* UART2 is tty2 */
# if CONFIG_STR71X_UART3
# define TTYS3_DEV g_uart3port /* UART3 is tty3 */
# endif
# elif CONFIG_STR71X_UART3
# define TTYS2_DEV g_uart3port /* UART3 is tty2 */
# endif
# elif CONFIG_STR71X_UART2
# define TTYS1_DEV g_uart2port /* UART2 is tty1 */
# if CONFIG_STR71X_UART3
# define TTYS2_DEV g_uart3port /* UART3 is tty2 */
# endif
# elif CONFIG_STR71X_UART3
# define TTYS1_DEV g_uart3port /* UART3 is tty1 */
# endif
#elif defined(CONFIG_UART1_SERIAL_CONSOLE)
# ifndef CONFIG_STR71X_UART1
# error "UART1 not selected, cannot be console"
# endif
# define CONSOLE_DEV g_uart1port /* UART1 is console */
# define TTYS0_DEV g_uart1port /* UART1 is tty0 */
# if CONFIG_STR71X_UART0
# define TTYS1_DEV g_uart0port /* UART0 is tty1 */
# if CONFIG_STR71X_UART2
# define TTYS2_DEV g_uart2port /* UART2 is tty2 */
# if CONFIG_STR71X_UART3
# define TTYS3_DEV g_uart3port /* UART3 is tty3 */
# endif
# elif CONFIG_STR71X_UART3
# define TTYS2_DEV g_uart3port /* UART3 is tty2 */
# endif
# elif CONFIG_STR71X_UART2
# define TTYS1_DEV g_uart2port /* UART2 is tty1 */
# if CONFIG_STR71X_UART3
# define TTYS2_DEV g_uart3port /* UART3 is tty2 */
# endif
# elif CONFIG_STR71X_UART3
# define TTYS1_DEV g_uart3port /* UART3 is tty1 */
# endif
#elif defined(CONFIG_UART2_SERIAL_CONSOLE)
# ifndef CONFIG_STR71X_UART2
# error "UART2 not selected, cannot be console"
# endif
# define CONSOLE_DEV g_uart2port /* UART2 is console */
# define TTYS0_DEV g_uart2port /* UART2 is tty0 */
# if CONFIG_STR71X_UART0
# define TTYS1_DEV g_uart0port /* UART0 is tty1 */
# if CONFIG_STR71X_UART1
# define TTYS2_DEV g_uart1port /* UART1 is tty2 */
# if CONFIG_STR71X_UART3
# define TTYS3_DEV g_uart3port /* UART3 is tty3 */
# endif
# elif CONFIG_STR71X_UART3
# define TTYS2_DEV g_uart3port /* UART3 is tty2 */
# endif
# elif CONFIG_STR71X_UART1
# define TTYS1_DEV g_uart1port /* UART1 is tty1 */
# if CONFIG_STR71X_UART3
# define TTYS2_DEV g_uart3port /* UART3 is tty2 */
# endif
# elif CONFIG_STR71X_UART3
# define TTYS1_DEV g_uart3port /* UART3 is tty1 */
# endif
#elif defined(CONFIG_UART3_SERIAL_CONSOLE)
# ifndef CONFIG_STR71X_UART3
# error "UART3 not selected, cannot be console"
# endif
# define CONSOLE_DEV g_uart3port /* UART3 is console */
# define TTYS0_DEV g_uart3port /* UART3 is tty0 */
# if CONFIG_STR71X_UART0
# define TTYS1_DEV g_uart0port /* UART0 is tty1 */
# if CONFIG_STR71X_UART1
# define TTYS2_DEV g_uart1port /* UART1 is tty2 */
# if CONFIG_STR71X_UART2
# define TTYS3_DEV g_uart2port /* UART2 is tty3 */
# endif
# elif CONFIG_STR71X_UART2
# define TTYS2_DEV g_uart2port /* UART2 is tty2 */
# endif
# elif CONFIG_STR71X_UART1
# define TTYS1_DEV g_uart1port /* UART1 is tty1 */
# if CONFIG_STR71X_UART2
# define TTYS2_DEV g_uart2port /* UART2 is tty2 */
# endif
# elif CONFIG_STR71X_UART2
# define TTYS1_DEV g_uart2port /* UART2 is tty1 */
# endif
#else
# warning "No CONFIG_UARTn_SERIAL_CONSOLE Setting"
#endif
/* Select RX interrupt enable bits. There are two models: (1) We interrupt
* when each character is received. Or, (2) we interrupt when either the Rx
* FIFO is half full, OR a timeout occurs with data in the RX FIFO. The
* later does not work because there seems to be a disconnect -- we can get
* the FIFO half full interrupt with no data in the RX buffer.
*/
#if 1
# define RXENABLE_BITS (STR71X_UARTIER_RHF|STR71X_UARTIER_TIMEOUTNE)
#else
# define RXENABLE_BITS STR71X_UARTIER_RNE
#endif
/* Which ever model is used, there seems to be some timing disconnects between
* Rx FIFO not full and Rx FIFO half full indications. Best bet is to use
* both.
*/
#define RXAVAILABLE_BITS (STR71X_UARTSR_RNE|STR71X_UARTSR_RHF)
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
uint32_t uartbase; /* Base address of UART registers */
uint32_t baud; /* Configured baud */
uint16_t ier; /* Saved IER value */
uint16_t sr; /* Saved SR value (only used during interrupt processing) */
uint8_t irq; /* IRQ associated with this UART */
uint8_t parity; /* 0=none, 1=odd, 2=even */
uint8_t bits; /* Number of bits (7 or 8) */
bool stopbits2; /* true: Configure with 2 stop bits instead of 1 */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Internal Helpers */
static inline uint16_t up_serialin(struct up_dev_s *priv, int offset);
static inline void up_serialout(struct up_dev_s *priv, int offset, uint16_t value);
static inline void up_disableuartint(struct up_dev_s *priv, uint16_t *ier);
static inline void up_restoreuartint(struct up_dev_s *priv, uint16_t ier);
#ifdef HAVE_CONSOLE
static inline void up_waittxnotfull(struct up_dev_s *priv);
#endif
/* Serial Driver Methods */
static int up_setup(struct uart_dev_s *dev);
static void up_shutdown(struct uart_dev_s *dev);
static int up_attach(struct uart_dev_s *dev);
static void up_detach(struct uart_dev_s *dev);
static int up_interrupt(int irq, void *context);
static int up_ioctl(struct file *filep, int cmd, unsigned long arg);
static int up_receive(struct uart_dev_s *dev, uint32_t *status);
static void up_rxint(struct uart_dev_s *dev, bool enable);
static bool up_rxavailable(struct uart_dev_s *dev);
static void up_send(struct uart_dev_s *dev, int ch);
static void up_txint(struct uart_dev_s *dev, bool enable);
static bool up_txready(struct uart_dev_s *dev);
static bool up_txempty(struct uart_dev_s *dev);
/****************************************************************************
* Private Variables
****************************************************************************/
struct uart_ops_s g_uart_ops =
{
.setup = up_setup,
.shutdown = up_shutdown,
.attach = up_attach,
.detach = up_detach,
.ioctl = up_ioctl,
.receive = up_receive,
.rxint = up_rxint,
.rxavailable = up_rxavailable,
.send = up_send,
.txint = up_txint,
.txready = up_txready,
.txempty = up_txempty,
};
/* I/O buffers */
#ifdef CONFIG_STR71X_UART0
static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE];
static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE];
#endif
#ifdef CONFIG_STR71X_UART1
static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE];
static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE];
#endif
#ifdef CONFIG_STR71X_UART2
static char g_uart2rxbuffer[CONFIG_UART1_RXBUFSIZE];
static char g_uart2txbuffer[CONFIG_UART1_TXBUFSIZE];
#endif
#ifdef CONFIG_STR71X_UART3
static char g_uart3rxbuffer[CONFIG_UART1_RXBUFSIZE];
static char g_uart3txbuffer[CONFIG_UART1_TXBUFSIZE];
#endif
/* This describes the state of the STR71X uart0 port. */
#ifdef CONFIG_STR71X_UART0
static struct up_dev_s g_uart0priv =
{
.uartbase = STR71X_UART0_BASE,
.baud = CONFIG_UART0_BAUD,
.irq = STR71X_IRQ_UART0,
.parity = CONFIG_UART0_PARITY,
.bits = CONFIG_UART0_BITS,
.stopbits2 = CONFIG_UART0_2STOP,
};
static uart_dev_t g_uart0port =
{
.recv =
{
.size = CONFIG_UART0_RXBUFSIZE,
.buffer = g_uart0rxbuffer,
},
.xmit =
{
.size = CONFIG_UART0_TXBUFSIZE,
.buffer = g_uart0txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart0priv,
};
#endif
/* This describes the state of the STR71X uart1 port. */
#ifdef CONFIG_STR71X_UART1
static struct up_dev_s g_uart1priv =
{
.uartbase = STR71X_UART1_BASE,
.baud = CONFIG_UART1_BAUD,
.irq = STR71X_IRQ_UART1,
.parity = CONFIG_UART1_PARITY,
.bits = CONFIG_UART1_BITS,
.stopbits2 = CONFIG_UART1_2STOP,
};
static uart_dev_t g_uart1port =
{
.recv =
{
.size = CONFIG_UART1_RXBUFSIZE,
.buffer = g_uart1rxbuffer,
},
.xmit =
{
.size = CONFIG_UART1_TXBUFSIZE,
.buffer = g_uart1txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart1priv,
};
#endif
/* This describes the state of the STR71X uart2 port. */
#ifdef CONFIG_STR71X_UART2
static struct up_dev_s g_uart2priv =
{
.uartbase = STR71X_UART2_BASE,
.baud = CONFIG_UART2_BAUD,
.irq = STR71X_IRQ_UART2,
.parity = CONFIG_UART2_PARITY,
.bits = CONFIG_UART2_BITS,
.stopbits2 = CONFIG_UART2_2STOP,
};
static uart_dev_t g_uart2port =
{
.recv =
{
.size = CONFIG_UART2_RXBUFSIZE,
.buffer = g_uart2rxbuffer,
},
.xmit =
{
.size = CONFIG_UART2_TXBUFSIZE,
.buffer = g_uart2txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart2priv,
};
#endif
/* This describes the state of the STR71X uart3 port. */
#ifdef CONFIG_STR71X_UART3
static struct up_dev_s g_uart3priv =
{
.uartbase = STR71X_UART3_BASE,
.baud = CONFIG_UART3_BAUD,
.irq = STR71X_IRQ_UART3,
.parity = CONFIG_UART3_PARITY,
.bits = CONFIG_UART3_BITS,
.stopbits2 = CONFIG_UART3_2STOP,
};
static uart_dev_t g_uart3port =
{
.recv =
{
.size = CONFIG_UART3_RXBUFSIZE,
.buffer = g_uart3rxbuffer,
},
.xmit =
{
.size = CONFIG_UART3_TXBUFSIZE,
.buffer = g_uart3txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart3priv,
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialin
****************************************************************************/
static inline uint16_t up_serialin(struct up_dev_s *priv, int offset)
{
return getreg16(priv->uartbase + offset);
}
/****************************************************************************
* Name: up_serialout
****************************************************************************/
static inline void up_serialout(struct up_dev_s *priv, int offset, uint16_t value)
{
putreg16(value, priv->uartbase + offset);
}
/****************************************************************************
* Name: up_disableuartint
****************************************************************************/
static inline void up_disableuartint(struct up_dev_s *priv, uint16_t *ier)
{
if (ier)
{
*ier = priv->ier;
}
priv->ier = 0;
up_serialout(priv, STR71X_UART_IER_OFFSET, 0);
}
/****************************************************************************
* Name: up_restoreuartint
****************************************************************************/
static inline void up_restoreuartint(struct up_dev_s *priv, uint16_t ier)
{
priv->ier = ier;
up_serialout(priv, STR71X_UART_IER_OFFSET, ier);
}
/****************************************************************************
* Name: up_waittxnotfull
****************************************************************************/
#ifdef HAVE_CONSOLE
static inline void up_waittxnotfull(struct up_dev_s *priv)
{
int tmp;
/* Limit how long we will wait for the TX available condition */
for (tmp = 1000 ; tmp > 0 ; tmp--)
{
/* Check TX FIFO is full */
if ((up_serialin(priv, STR71X_UART_SR_OFFSET) & STR71X_UARTSR_TF) == 0)
{
/* The TX FIFO is not full... return */
break;
}
}
}
#endif
/****************************************************************************
* Name: up_setup
*
* Description:
* Configure the UART baud, bits, parity, fifos, etc. This
* method is called the first time that the serial port is
* opened.
*
****************************************************************************/
static int up_setup(struct uart_dev_s *dev)
{
#ifndef CONFIG_SUPPRESS_UART_CONFIG
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
uint32_t divisor;
uint32_t baud;
uint16_t cr;
/* Set the BAUD rate */
divisor = 16 * priv->baud;
baud = (STR71X_PCLK1 + divisor/2) / divisor;
up_serialout(priv, STR71X_UART_BR_OFFSET, baud);
/* Get mode setting */
cr = STR71X_UARTCR_RUN|STR71X_UARTCR_RXENABLE|STR71X_UARTCR_FIFOENABLE;
if (priv->bits == 7)
{
DEBUGASSERT(priv->parity != 0);
cr |= STR71X_UARTCR_MODE7BITP;
}
else if (priv->bits == 8)
{
if (priv->parity)
{
cr |= STR71X_UARTCR_MODE8BITP;
}
else
{
cr |= STR71X_UARTCR_MODE8BIT;
}
}
else
{
DEBUGASSERT(priv->bits == 9 && priv->parity == 0);
cr |= STR71X_UARTCR_MODE9BIT;
}
if (priv->parity == 1)
{
cr |= STR71X_UARTCR_PARITYODD;
}
if (priv->stopbits2)
{
cr |= STR71X_UARTCR_STOPBIT20;
}
else
{
cr |= STR71X_UARTCR_STOPBIT10;
}
up_serialout(priv, STR71X_UART_CR_OFFSET, cr);
/* Clear FIFOs */
up_serialout(priv, STR71X_UART_TXRSTR_OFFSET, 0xffff);
up_serialout(priv, STR71X_UART_RXRSTR_OFFSET, 0xffff);
/* We will take RX interrupts on either the FIFO half full or upon
* a timeout. The timeout is based upon BAUD rate ticks
*/
up_serialout(priv, STR71X_UART_TOR_OFFSET, 50);
/* Set up the IER */
priv->ier = up_serialin(priv, STR71X_UART_IER_OFFSET);
#endif
return OK;
}
/****************************************************************************
* Name: up_shutdown
*
* Description:
* Disable the UART. This method is called when the serial
* port is closed
*
****************************************************************************/
static void up_shutdown(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
up_disableuartint(priv, NULL);
}
/****************************************************************************
* Name: up_attach
*
* Description:
* Configure the UART to operation in interrupt driven mode. This method is
* called when the serial port is opened. Normally, this is just after the
* the setup() method is called, however, the serial console may operate in
* a non-interrupt driven mode during the boot phase.
*
* RX and TX interrupts are not enabled when by the attach method (unless the
* hardware supports multiple levels of interrupt enabling). The RX and TX
* interrupts are not enabled until the txint() and rxint() methods are called.
*
****************************************************************************/
static int up_attach(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
int ret;
/* Attach and enable the IRQ */
ret = irq_attach(priv->irq, up_interrupt);
if (ret == OK)
{
/* Enable the interrupt (RX and TX interrupts are still disabled
* in the UART
*/
up_enable_irq(priv->irq);
/* Set the uart interrupt priority (the default value is one) */
up_prioritize_irq(priv->irq, CONFIG_UART_PRI);
}
return ret;
}
/****************************************************************************
* Name: up_detach
*
* Description:
* Detach UART interrupts. This method is called when the serial port is
* closed normally just before the shutdown method is called. The exception is
* the serial console which is never shutdown.
*
****************************************************************************/
static void up_detach(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
up_disable_irq(priv->irq);
irq_detach(priv->irq);
}
/****************************************************************************
* Name: up_interrupt
*
* Description:
* This is the UART interrupt handler. It will be invoked
* when an interrupt received on the 'irq' It should call
* uart_transmitchars or uart_receivechar to perform the
* appropriate data transfers. The interrupt handling logic\
* must be able to map the 'irq' number into the approprite
* uart_dev_s structure in order to call these functions.
*
****************************************************************************/
static int up_interrupt(int irq, void *context)
{
struct uart_dev_s *dev = NULL;
struct up_dev_s *priv;
int passes;
bool handled;
#ifdef CONFIG_STR71X_UART0
if (g_uart0priv.irq == irq)
{
dev = &g_uart0port;
}
else
#endif
#ifdef CONFIG_STR71X_UART1
if (g_uart1priv.irq == irq)
{
dev = &g_uart1port;
}
else
#endif
#ifdef CONFIG_STR71X_UART2
if (g_uart2priv.irq == irq)
{
dev = &g_uart2port;
}
else
#endif
#ifdef CONFIG_STR71X_UART3
if (g_uart3priv.irq == irq)
{
dev = &g_uart3port;
}
else
#endif
{
PANIC(OSERR_INTERNAL);
}
priv = (struct up_dev_s*)dev->priv;
DEBUGASSERT(priv && dev);
/* Loop until there are no characters to be transferred or,
* until we have been looping for a long time.
*/
handled = true;
for (passes = 0; passes < 256 && handled; passes++)
{
handled = false;
/* Get the current UART status */
priv->sr = up_serialin(priv, STR71X_UART_SR_OFFSET);
/* Handle incoming, receive bytes (with or without timeout) */
if ((priv->sr & RXAVAILABLE_BITS) != 0 && /* Data available in Rx FIFO */
(priv->ier & RXENABLE_BITS) != 0) /* Rx FIFO interrupts enabled */
{
/* Rx buffer not empty ... process incoming bytes */
uart_recvchars(dev);
handled = true;
}
/* Handle outgoing, transmit bytes */
if ((priv->sr & STR71X_UARTSR_TF) == 0 && /* Tx FIFO not full */
(priv->ier & STR71X_UARTIER_THE) != 0) /* Tx Half empty interrupt enabled */
{
/* Tx FIFO not full ... process outgoing bytes */
uart_xmitchars(dev);
handled = true;
}
}
return OK;
}
/****************************************************************************
* Name: up_ioctl
*
* Description:
* All ioctl calls will be routed through this method
*
****************************************************************************/
static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
{
struct inode *inode = filep->f_inode;
struct uart_dev_s *dev = inode->i_private;
int ret = OK;
switch (cmd)
{
case TIOCSERGSTRUCT:
{
struct up_dev_s *user = (struct up_dev_s*)arg;
if (!user)
{
ret = -EINVAL;
}
else
{
memcpy(user, dev, sizeof(struct up_dev_s));
}
}
break;
default:
ret = -ENOTTY;
break;
}
return ret;
}
/****************************************************************************
* Name: up_receive
*
* Description:
* Called (usually) from the interrupt level to receive one
* character from the UART. Error bits associated with the
* receipt are provided in the return 'status'.
*
****************************************************************************/
static int up_receive(struct uart_dev_s *dev, uint32_t *status)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
uint16_t rxbufr;
rxbufr = up_serialin(priv, STR71X_UART_RXBUFR_OFFSET);
*status = (uint32_t)priv->sr << 16 | rxbufr;
return rxbufr & 0xff;
}
/****************************************************************************
* Name: up_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
static void up_rxint(struct uart_dev_s *dev, bool enable)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
if (enable)
{
/* Receive an interrupt when the Rx FIFO is half full (or if a timeout
* occurs while the Rx FIFO is not empty).
*/
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->ier |= RXENABLE_BITS;
#endif
}
else
{
priv->ier &= ~RXENABLE_BITS;
}
up_serialout(priv, STR71X_UART_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_rxavailable
*
* Description:
* Return true if the receive fifo is not empty
*
****************************************************************************/
static bool up_rxavailable(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, STR71X_UART_SR_OFFSET) & RXAVAILABLE_BITS) != 0);
}
/****************************************************************************
* Name: up_send
*
* Description:
* This method will send one byte on the UART
*
****************************************************************************/
static void up_send(struct uart_dev_s *dev, int ch)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
up_serialout(priv, STR71X_UART_TXBUFR_OFFSET, (uint16_t)ch);
}
/****************************************************************************
* Name: up_txint
*
* Description:
* Call to enable or disable TX interrupts
*
****************************************************************************/
static void up_txint(struct uart_dev_s *dev, bool enable)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
if (enable)
{
/* Set to receive an interrupt when the TX fifo is half emptied */
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->ier |= STR71X_UARTSR_THE;
#endif
}
else
{
/* Disable the TX interrupt */
priv->ier &= ~STR71X_UARTSR_THE;
}
up_serialout(priv, STR71X_UART_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_txready
*
* Description:
* Return true if the tranmsit fifo is not full
*
****************************************************************************/
static bool up_txready(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, STR71X_UART_SR_OFFSET) & STR71X_UARTSR_TF) == 0);
}
/****************************************************************************
* Name: up_txempty
*
* Description:
* Return true if the transmit fifo is empty
*
****************************************************************************/
static bool up_txempty(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, STR71X_UART_SR_OFFSET) & STR71X_UARTSR_TE) != 0);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Performs the low level UART initialization early in
* debug so that the serial console will be available
* during bootup. This must be called before up_serialinit.
*
****************************************************************************/
void up_earlyserialinit(void)
{
/* NOTE: All GPIO configuration for the UARTs was performed in
* up_lowsetup
*/
/* Disable all UARTS */
up_disableuartint(TTYS0_DEV.priv, NULL);
#ifdef TTYS1_DEV
up_disableuartint(TTYS1_DEV.priv, NULL);
#endif
#ifdef TTYS2_DEV
up_disableuartint(TTYS2_DEV.priv, NULL);
#endif
#ifdef TTYS3_DEV
up_disableuartint(TTYS3_DEV.priv, NULL);
#endif
/* Configuration whichever one is the console */
#ifdef HAVE_CONSOLE
CONSOLE_DEV.isconsole = true;
up_setup(&CONSOLE_DEV);
#endif
}
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Register serial console and serial ports. This assumes
* that up_earlyserialinit was called previously.
*
****************************************************************************/
void up_serialinit(void)
{
/* Register the console */
#ifdef HAVE_CONSOLE
(void)uart_register("/dev/console", &CONSOLE_DEV);
#endif
/* Register all UARTs */
(void)uart_register("/dev/ttyS0", &TTYS0_DEV);
#ifdef TTYS1_DEV
(void)uart_register("/dev/ttyS1", &TTYS1_DEV);
#endif
#ifdef TTYS2_DEV
(void)uart_register("/dev/ttyS2", &TTYS2_DEV);
#endif
#ifdef TTYS3_DEV
(void)uart_register("/dev/ttyS3", &TTYS3_DEV);
#endif
}
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#ifdef HAVE_CONSOLE
struct up_dev_s *priv = (struct up_dev_s*)CONSOLE_DEV.priv;
uint16_t ier;
up_disableuartint(priv, &ier);
up_waittxnotfull(priv);
up_serialout(priv, STR71X_UART_TXBUFR_OFFSET, (uint16_t)ch);
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_waittxnotfull(priv);
up_serialout(priv, STR71X_UART_TXBUFR_OFFSET, (uint16_t)'\r');
}
up_waittxnotfull(priv);
up_restoreuartint(priv, ier);
#endif
return ch;
}
#else /* USE_SERIALDRIVER */
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#ifdef HAVE_CONSOLE
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_lowputc('\r');
}
up_lowputc(ch);
#endif
return ch;
}
#endif /* USE_SERIALDRIVER */
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