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nuttx/arch/arm/src/tiva/tiva_serial.c

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/****************************************************************************
* arch/arm/src/tiva/tiva_serial.c
*
* Copyright (C) 2009-2010, 2012-2014 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/serial.h>
#include <arch/serial.h>
#include <arch/board/board.h>
#include "chip.h"
#include "up_arch.h"
#include "up_internal.h"
#include "tiva_lowputc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Some sanity checks *******************************************************/
/* Is there a UART enabled? */
#if !defined(CONFIG_TIVA_UART0) && !defined(CONFIG_TIVA_UART1) && !defined(CONFIG_TIVA_UART2) && \
!defined(CONFIG_TIVA_UART3) && !defined(CONFIG_TIVA_UART4) && !defined(CONFIG_TIVA_UART5) && \
!defined(CONFIG_TIVA_UART6) && !defined(CONFIG_TIVA_UART7)
# error "No UARTs enabled"
#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 tty1-7? The console will always
* be ttyS0. If there is no console then will use the lowest numbered UART.
*/
/* First pick the console and ttys0. This could be any of UART0-5 */
#if defined(CONFIG_UART0_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart0port /* UART0 is console */
# define TTYS0_DEV g_uart0port /* UART0 is ttyS0 */
# define UART0_ASSIGNED 1
#elif defined(CONFIG_UART1_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart1port /* UART1 is console */
# define TTYS0_DEV g_uart1port /* UART1 is ttyS0 */
# define UART1_ASSIGNED 1
#elif defined(CONFIG_UART2_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart2port /* UART2 is console */
# define TTYS0_DEV g_uart2port /* UART2 is ttyS0 */
# define UART2_ASSIGNED 1
#elif defined(CONFIG_UART3_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart3port /* UART3 is console */
# define TTYS0_DEV g_uart3port /* UART3 is ttyS0 */
# define UART3_ASSIGNED 1
#elif defined(CONFIG_UART4_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart4port /* UART4 is console */
# define TTYS0_DEV g_uart4port /* UART4 is ttyS0 */
# define UART4_ASSIGNED 1
#elif defined(CONFIG_UART5_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart5port /* UART5 is console */
# define TTYS5_DEV g_uart5port /* UART5 is ttyS0 */
#elif defined(CONFIG_UART6_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart6port /* UART6 is console */
# define TTYS5_DEV g_uart6port /* UART6 is ttyS0 */
#elif defined(CONFIG_UART7_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart7port /* UART7 is console */
# define TTYS5_DEV g_uart7port /* UART7 is ttyS0 */
#else
# undef CONSOLE_DEV /* No console */
# if defined(CONFIG_TIVA_UART0)
# define TTYS0_DEV g_uart0port /* UART0 is ttyS0 */
# define UART0_ASSIGNED 1
# elif defined(CONFIG_TIVA_UART1)
# define TTYS0_DEV g_uart1port /* UART1 is ttyS0 */
# define UART1_ASSIGNED 1
# elif defined(CONFIG_TIVA_UART2)
# define TTYS0_DEV g_uart2port /* UART2 is ttyS0 */
# define UART2_ASSIGNED 1
# elif defined(CONFIG_TIVA_UART3)
# define TTYS0_DEV g_uart3port /* UART3 is ttyS0 */
# define UART3_ASSIGNED 1
# elif defined(CONFIG_TIVA_UART4)
# define TTYS0_DEV g_uart4port /* UART4 is ttyS0 */
# define UART4_ASSIGNED 1
# elif defined(CONFIG_TIVA_UART5)
# define TTYS0_DEV g_uart5port /* UART5 is ttyS0 */
# define UART5_ASSIGNED 1
# elif defined(CONFIG_TIVA_UART6)
# define TTYS0_DEV g_uart6port /* UART5 is ttyS0 */
# define UART6_ASSIGNED 1
# elif defined(CONFIG_TIVA_UART7)
# define TTYS0_DEV g_uart7port /* UART5 is ttyS0 */
# define UART7_ASSIGNED 1
# endif
#endif
/* Pick ttys1. This could be any of UART0-7 excluding the console UART. */
#if defined(CONFIG_TIVA_UART0) && !defined(UART0_ASSIGNED)
# define TTYS1_DEV g_uart0port /* UART0 is ttyS1 */
# define UART0_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART1) && !defined(UART1_ASSIGNED)
# define TTYS1_DEV g_uart1port /* UART1 is ttyS1 */
# define UART1_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART2) && !defined(UART2_ASSIGNED)
# define TTYS1_DEV g_uart2port /* UART2 is ttyS1 */
# define UART2_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART3) && !defined(UART3_ASSIGNED)
# define TTYS1_DEV g_uart3port /* UART3 is ttyS1 */
# define UART3_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART4) && !defined(UART4_ASSIGNED)
# define TTYS1_DEV g_uart4port /* UART4 is ttyS1 */
# define UART4_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART5) && !defined(UART5_ASSIGNED)
# define TTYS1_DEV g_uart5port /* UART5 is ttyS1 */
# define UART5_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART6) && !defined(UART6_ASSIGNED)
# define TTYS1_DEV g_uart6port /* UART6 is ttyS1 */
# define UART6_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART7) && !defined(UART7_ASSIGNED)
# define TTYS1_DEV g_uart7port /* UART7 is ttyS1 */
# define UART7_ASSIGNED 1
#endif
/* Pick ttys2. This could be one of UART1-7. It can't be UART0 because that
* was either assigned as ttyS0 or ttys1. One of UART 1-7 could also be the
* console.
*/
#if defined(CONFIG_TIVA_UART1) && !defined(UART1_ASSIGNED)
# define TTYS2_DEV g_uart1port /* UART1 is ttyS2 */
# define UART1_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART2) && !defined(UART2_ASSIGNED)
# define TTYS2_DEV g_uart2port /* UART2 is ttyS2 */
# define UART2_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART3) && !defined(UART3_ASSIGNED)
# define TTYS2_DEV g_uart3port /* UART3 is ttyS2 */
# define UART3_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART4) && !defined(UART4_ASSIGNED)
# define TTYS2_DEV g_uart4port /* UART4 is ttyS2 */
# define UART4_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART5) && !defined(UART5_ASSIGNED)
# define TTYS2_DEV g_uart5port /* UART5 is ttyS2 */
# define UART5_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART6) && !defined(UART6_ASSIGNED)
# define TTYS2_DEV g_uart6port /* UART6 is ttyS2 */
# define UART6_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART7) && !defined(UART7_ASSIGNED)
# define TTYS2_DEV g_uart7port /* UART7 is ttyS2 */
# define UART7_ASSIGNED 1
#endif
/* Pick ttys3. This could be one of UART2-7. It can't be UART0-1 because
* those have already been assigned to ttsyS0, 1, or 2. One of
* UART 2-7 could also be the console.
*/
#if defined(CONFIG_TIVA_UART2) && !defined(UART2_ASSIGNED)
# define TTYS3_DEV g_uart2port /* UART2 is ttyS3 */
# define UART2_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART3) && !defined(UART3_ASSIGNED)
# define TTYS3_DEV g_uart3port /* UART3 is ttyS3 */
# define UART3_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART4) && !defined(UART4_ASSIGNED)
# define TTYS3_DEV g_uart4port /* UART4 is ttyS3 */
# define UART4_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART5) && !defined(UART5_ASSIGNED)
# define TTYS3_DEV g_uart5port /* UART5 is ttyS3 */
# define UART5_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART6) && !defined(UART6_ASSIGNED)
# define TTYS3_DEV g_uart6port /* UART6 is ttyS3 */
# define UART6_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART7) && !defined(UART7_ASSIGNED)
# define TTYS3_DEV g_uart7port /* UART7 is ttyS3 */
# define UART7_ASSIGNED 1
#endif
/* Pick ttys4. This could be one of UART3-7. It can't be UART0-2 because
* those have already been assigned to ttsyS0, 1, 2 or 3. One of
* UART 3-7 could also be the console.
*/
#if defined(CONFIG_TIVA_UART3) && !defined(UART3_ASSIGNED)
# define TTYS4_DEV g_uart3port /* UART3 is ttyS4 */
# define UART3_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART4) && !defined(UART4_ASSIGNED)
# define TTYS4_DEV g_uart4port /* UART4 is ttyS4 */
# define UART4_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART5) && !defined(UART5_ASSIGNED)
# define TTYS4_DEV g_uart5port /* UART5 is ttyS4 */
# define UART5_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART6) && !defined(UART6_ASSIGNED)
# define TTYS4_DEV g_uart6port /* UART6 is ttyS4 */
# define UART6_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART7) && !defined(UART7_ASSIGNED)
# define TTYS4_DEV g_uart7port /* UART7 is ttyS4 */
# define UART7_ASSIGNED 1
#endif
/* Pick ttys5. This could be one of UART4-7. It can't be UART0-3 because
* those have already been assigned to ttsyS0, 1, 2, 3 or 4. One of
* UART 4-7 could also be the console.
*/
#if defined(CONFIG_TIVA_UART4) && !defined(UART4_ASSIGNED)
# define TTYS5_DEV g_uart4port /* UART4 is ttyS5 */
# define UART4_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART5) && !defined(UART5_ASSIGNED)
# define TTYS5_DEV g_uart5port /* UART5 is ttyS5 */
# define UART5_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART6) && !defined(UART6_ASSIGNED)
# define TTYS5_DEV g_uart6port /* UART6 is ttyS5 */
# define UART6_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART7) && !defined(UART7_ASSIGNED)
# define TTYS5_DEV g_uart7port /* UART7 is ttyS5 */
# define UART7_ASSIGNED 1
#endif
/* Pick ttys6. This could be one of UART5-7. It can't be UART0-4 because
* those have already been assigned to ttsyS0, 1, 2, 3, 4, or 5. One of
* UART 5-7 could also be the console.
*/
#if defined(CONFIG_TIVA_UART5) && !defined(UART5_ASSIGNED)
# define TTYS6_DEV g_uart5port /* UART5 is ttyS6 */
# define UART5_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART6) && !defined(UART6_ASSIGNED)
# define TTYS6_DEV g_uart6port /* UART6 is ttyS6 */
# define UART6_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART7) && !defined(UART7_ASSIGNED)
# define TTYS6_DEV g_uart7port /* UART7 is ttyS6 */
# define UART7_ASSIGNED 1
#endif
/* Pick ttys7. This could be one of UART6-7. It can't be UART0-5 because
* those have already been assigned to ttsyS0, 1, 2, 3, 4, or 6. One of
* UART 6-7 could also be the console.
*/
#if defined(CONFIG_TIVA_UART6) && !defined(UART6_ASSIGNED)
# define TTYS7_DEV g_uart6port /* UART6 is ttyS7 */
# define UART6_ASSIGNED 1
#elif defined(CONFIG_TIVA_UART7) && !defined(UART7_ASSIGNED)
# define TTYS7_DEV g_uart7port /* UART7 is ttyS7 */
# define UART7_ASSIGNED 1
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
uint32_t uartbase; /* Base address of UART registers */
uint32_t baud; /* Configured baud */
uint32_t im; /* Saved IM value */
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
****************************************************************************/
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
****************************************************************************/
static const 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,
#ifdef CONFIG_SERIAL_IFLOWCONTROL
.rxflowcontrol = NULL,
#endif
.send = up_send,
.txint = up_txint,
.txready = up_txready,
.txempty = up_txempty,
};
/* I/O buffers */
#ifdef CONFIG_TIVA_UART0
static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE];
static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE];
#endif
#ifdef CONFIG_TIVA_UART1
static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE];
static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE];
#endif
#ifdef CONFIG_TIVA_UART2
static char g_uart2rxbuffer[CONFIG_UART2_RXBUFSIZE];
static char g_uart2txbuffer[CONFIG_UART2_TXBUFSIZE];
#endif
#ifdef CONFIG_TIVA_UART3
static char g_uart3rxbuffer[CONFIG_UART3_RXBUFSIZE];
static char g_uart3txbuffer[CONFIG_UART3_TXBUFSIZE];
#endif
#ifdef CONFIG_TIVA_UART4
static char g_uart4rxbuffer[CONFIG_UART4_RXBUFSIZE];
static char g_uart4txbuffer[CONFIG_UART4_TXBUFSIZE];
#endif
#ifdef CONFIG_TIVA_UART5
static char g_uart5rxbuffer[CONFIG_UART5_RXBUFSIZE];
static char g_uart5txbuffer[CONFIG_UART5_TXBUFSIZE];
#endif
#ifdef CONFIG_TIVA_UART6
static char g_uart6rxbuffer[CONFIG_UART6_RXBUFSIZE];
static char g_uart6txbuffer[CONFIG_UART6_TXBUFSIZE];
#endif
#ifdef CONFIG_TIVA_UART7
static char g_uart7rxbuffer[CONFIG_UART7_RXBUFSIZE];
static char g_uart7txbuffer[CONFIG_UART7_TXBUFSIZE];
#endif
/* This describes the state of the Stellaris uart0 port. */
#ifdef CONFIG_TIVA_UART0
static struct up_dev_s g_uart0priv =
{
.uartbase = TIVA_UART0_BASE,
.baud = CONFIG_UART0_BAUD,
.irq = TIVA_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 Stellaris uart1 port. */
#ifdef CONFIG_TIVA_UART1
static struct up_dev_s g_uart1priv =
{
.uartbase = TIVA_UART1_BASE,
.baud = CONFIG_UART1_BAUD,
.irq = TIVA_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 Stellaris uart2 port. */
#ifdef CONFIG_TIVA_UART2
static struct up_dev_s g_uart2priv =
{
.uartbase = TIVA_UART2_BASE,
.baud = CONFIG_UART2_BAUD,
.irq = TIVA_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 Stellaris uart3 port. */
#ifdef CONFIG_TIVA_UART3
static struct up_dev_s g_uart3priv =
{
.uartbase = TIVA_UART3_BASE,
.baud = CONFIG_UART3_BAUD,
.irq = TIVA_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
/* This describes the state of the Stellaris uart4 port. */
#ifdef CONFIG_TIVA_UART4
static struct up_dev_s g_uart4priv =
{
.uartbase = TIVA_UART4_BASE,
.baud = CONFIG_UART4_BAUD,
.irq = TIVA_IRQ_UART4,
.parity = CONFIG_UART4_PARITY,
.bits = CONFIG_UART4_BITS,
.stopbits2 = CONFIG_UART4_2STOP,
};
static uart_dev_t g_uart4port =
{
.recv =
{
.size = CONFIG_UART4_RXBUFSIZE,
.buffer = g_uart4rxbuffer,
},
.xmit =
{
.size = CONFIG_UART4_TXBUFSIZE,
.buffer = g_uart4txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart4priv,
};
#endif
/* This describes the state of the Stellaris uart5 port. */
#ifdef CONFIG_TIVA_UART5
static struct up_dev_s g_uart5priv =
{
.uartbase = TIVA_UART5_BASE,
.baud = CONFIG_UART5_BAUD,
.irq = TIVA_IRQ_UART5,
.parity = CONFIG_UART5_PARITY,
.bits = CONFIG_UART5_BITS,
.stopbits2 = CONFIG_UART5_2STOP,
};
static uart_dev_t g_uart5port =
{
.recv =
{
.size = CONFIG_UART5_RXBUFSIZE,
.buffer = g_uart5rxbuffer,
},
.xmit =
{
.size = CONFIG_UART5_TXBUFSIZE,
.buffer = g_uart5txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart5priv,
};
#endif
/* This describes the state of the Stellaris uart6 port. */
#ifdef CONFIG_TIVA_UART6
static struct up_dev_s g_uart6priv =
{
.uartbase = TIVA_UART6_BASE,
.baud = CONFIG_UART6_BAUD,
.irq = TIVA_IRQ_UART6,
.parity = CONFIG_UART6_PARITY,
.bits = CONFIG_UART6_BITS,
.stopbits2 = CONFIG_UART6_2STOP,
};
static uart_dev_t g_uart6port =
{
.recv =
{
.size = CONFIG_UART6_RXBUFSIZE,
.buffer = g_uart6rxbuffer,
},
.xmit =
{
.size = CONFIG_UART6_TXBUFSIZE,
.buffer = g_uart6txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart6priv,
};
#endif
/* This describes the state of the Stellaris uart7 port. */
#ifdef CONFIG_TIVA_UART7
static struct up_dev_s g_uart7priv =
{
.uartbase = TIVA_UART7_BASE,
.baud = CONFIG_UART7_BAUD,
.irq = TIVA_IRQ_UART7,
.parity = CONFIG_UART7_PARITY,
.bits = CONFIG_UART7_BITS,
.stopbits2 = CONFIG_UART7_2STOP,
};
static uart_dev_t g_uart7port =
{
.recv =
{
.size = CONFIG_UART7_RXBUFSIZE,
.buffer = g_uart7rxbuffer,
},
.xmit =
{
.size = CONFIG_UART7_TXBUFSIZE,
.buffer = g_uart7txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart7priv,
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialin
****************************************************************************/
static inline uint32_t up_serialin(struct up_dev_s *priv, int offset)
{
return getreg32(priv->uartbase + offset);
}
/****************************************************************************
* Name: up_serialout
****************************************************************************/
static inline void up_serialout(struct up_dev_s *priv, int offset, uint32_t value)
{
putreg32(value, priv->uartbase + offset);
}
/****************************************************************************
* Name: up_disableuartint
****************************************************************************/
static inline void up_disableuartint(struct up_dev_s *priv, uint32_t *im)
{
/* Return the current interrupt mask value */
if (im)
{
*im = priv->im;
}
/* Disable all interrupts */
priv->im = 0;
up_serialout(priv, TIVA_UART_IM_OFFSET, 0);
}
/****************************************************************************
* Name: up_restoreuartint
****************************************************************************/
static inline void up_restoreuartint(struct up_dev_s *priv, uint32_t im)
{
priv->im = im;
up_serialout(priv, TIVA_UART_IM_OFFSET, im);
}
/****************************************************************************
* Name: up_waittxnotfull
****************************************************************************/
#ifdef HAVE_SERIAL_CONSOLE
static inline void up_waittxnotfull(struct up_dev_s *priv)
{
volatile 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, TIVA_UART_FR_OFFSET) & UART_FR_TXFF) == 0)
{
/* The Tx FIFO is not full... return */
break;
}
}
/* If we get here, then the wait has timed out and the Tx FIFO remains
* full.
*/
}
#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)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
uint32_t lcrh;
uint32_t ctl;
#ifndef CONFIG_SUPPRESS_UART_CONFIG
uint32_t den;
uint32_t brdi;
uint32_t remainder;
uint32_t divfrac;
/* Note: The logic here depends on the fact that that the UART module
* was enabled and the GPIOs were configured in up_lowsetup().
*/
/* Disable the UART by clearing the UARTEN bit in the UART CTL register */
ctl = up_serialin(priv, TIVA_UART_CTL_OFFSET);
ctl &= ~UART_CTL_UARTEN;
up_serialout(priv, TIVA_UART_CTL_OFFSET, ctl);
/* Calculate BAUD rate from the SYS clock:
*
* "The baud-rate divisor is a 22-bit number consisting of a 16-bit integer
* and a 6-bit fractional part. The number formed by these two values is
* used by the baud-rate generator to determine the bit period. Having a
* fractional baud-rate divider allows the UART to generate all the standard
* baud rates.
*
* "The 16-bit integer is loaded through the UART Integer Baud-Rate Divisor
* (UARTIBRD) register ... and the 6-bit fractional part is loaded with the
* UART Fractional Baud-Rate Divisor (UARTFBRD) register... The baud-rate
* divisor (BRD) has the following relationship to the system clock (where
* BRDI is the integer part of the BRD and BRDF is the fractional part,
* separated by a decimal place.):
*
* "BRD = BRDI + BRDF = UARTSysClk / (16 * Baud Rate)
*
* "where UARTSysClk is the system clock connected to the UART. The 6-bit
* fractional number (that is to be loaded into the DIVFRAC bit field in the
* UARTFBRD register) can be calculated by taking the fractional part of the
* baud-rate divisor, multiplying it by 64, and adding 0.5 to account for
* rounding errors:
*
* "UARTFBRD[DIVFRAC] = integer(BRDF * 64 + 0.5)
*
* "The UART generates an internal baud-rate reference clock at 16x the baud-
* rate (referred to as Baud16). This reference clock is divided by 16 to
* generate the transmit clock, and is used for error detection during receive
* operations.
*
* "Along with the UART Line Control, High Byte (UARTLCRH) register ..., the
* UARTIBRD and UARTFBRD registers form an internal 30-bit register. This
* internal register is only updated when a write operation to UARTLCRH is
* performed, so any changes to the baud-rate divisor must be followed by a
* write to the UARTLCRH register for the changes to take effect. ..."
*/
den = priv->baud << 4;
brdi = SYSCLK_FREQUENCY / den;
remainder = SYSCLK_FREQUENCY - den * brdi;
divfrac = ((remainder << 6) + (den >> 1)) / den;
up_serialout(priv, TIVA_UART_IBRD_OFFSET, brdi);
up_serialout(priv, TIVA_UART_FBRD_OFFSET, divfrac);
/* Set up the LCRH register */
lcrh = 0;
switch (priv->bits)
{
case 5:
lcrh |= UART_LCRH_WLEN_5BITS;
break;
case 6:
lcrh |= UART_LCRH_WLEN_6BITS;
break;
case 7:
lcrh |= UART_LCRH_WLEN_7BITS;
break;
case 8:
default:
lcrh |= UART_LCRH_WLEN_8BITS;
break;
}
switch (priv->parity)
{
case 0:
default:
break;
case 1:
lcrh |= UART_LCRH_PEN;
break;
case 2:
lcrh |= UART_LCRH_PEN|UART_LCRH_EPS;
break;
}
if (priv->stopbits2)
{
lcrh |= UART_LCRH_STP2;
}
up_serialout(priv, TIVA_UART_LCRH_OFFSET, lcrh);
#endif
/* Set the UART to interrupt whenever the TX FIFO is almost empty or when
* any character is received.
*/
up_serialout(priv, TIVA_UART_IFLS_OFFSET, UART_IFLS_TXIFLSEL_18th|UART_IFLS_RXIFLSEL_18th);
/* Flush the Rx and Tx FIFOs -- How do you do that?*/
/* Enable Rx interrupts from the UART except for Tx interrupts. We don't want
* Tx interrupts until we have something to send. We will check for serial
* errors as part of Rx interrupt processing (no interrupts will be received
* yet because the interrupt is still disabled at the interrupt controller.
*/
up_serialout(priv, TIVA_UART_IM_OFFSET, UART_IM_RXIM|UART_IM_RTIM);
/* Enable the FIFOs */
#ifdef CONFIG_SUPPRESS_UART_CONFIG
lcrh = up_serialin(priv, TIVA_UART_LCRH_OFFSET);
#endif
lcrh |= UART_LCRH_FEN;
up_serialout(priv, TIVA_UART_LCRH_OFFSET, lcrh);
/* Enable Rx, Tx, and the UART */
#ifdef CONFIG_SUPPRESS_UART_CONFIG
ctl = up_serialin(priv, TIVA_UART_CTL_OFFSET);
#endif
ctl |= (UART_CTL_UARTEN|UART_CTL_TXE|UART_CTL_RXE);
up_serialout(priv, TIVA_UART_CTL_OFFSET, ctl);
/* Set up the cache IM value */
priv->im = up_serialin(priv, TIVA_UART_IM_OFFSET);
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);
}
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;
uint32_t mis;
int passes;
bool handled;
#ifdef CONFIG_TIVA_UART0
if (g_uart0priv.irq == irq)
{
dev = &g_uart0port;
}
else
#endif
#ifdef CONFIG_TIVA_UART1
if (g_uart1priv.irq == irq)
{
dev = &g_uart1port;
}
else
#endif
#ifdef CONFIG_TIVA_UART2
if (g_uart2priv.irq == irq)
{
dev = &g_uart2port;
}
else
#endif
#ifdef CONFIG_TIVA_UART3
if (g_uart3priv.irq == irq)
{
dev = &g_uart3port;
}
else
#endif
#ifdef CONFIG_TIVA_UART4
if (g_uart4priv.irq == irq)
{
dev = &g_uart4port;
}
else
#endif
#ifdef CONFIG_TIVA_UART5
if (g_uart5priv.irq == irq)
{
dev = &g_uart5port;
}
else
#endif
#ifdef CONFIG_TIVA_UART6
if (g_uart6priv.irq == irq)
{
dev = &g_uart6port;
}
else
#endif
#ifdef CONFIG_TIVA_UART7
if (g_uart7priv.irq == irq)
{
dev = &g_uart7port;
}
else
#endif
{
PANIC();
}
priv = (struct up_dev_s*)dev->priv;
/* 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 masked UART status and clear the pending interrupts. */
mis = up_serialin(priv, TIVA_UART_MIS_OFFSET);
up_serialout(priv, TIVA_UART_ICR_OFFSET, mis);
/* Handle incoming, receive bytes (with or without timeout) */
if ((mis & (UART_MIS_RXMIS|UART_MIS_RTMIS)) != 0)
{
/* Rx buffer not empty ... process incoming bytes */
uart_recvchars(dev);
handled = true;
}
/* Handle outgoing, transmit bytes */
if ((mis & UART_MIS_TXMIS) != 0)
{
/* 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)
{
#ifdef CONFIG_SERIAL_TIOCSERGSTRUCT
struct inode *inode = filep->f_inode;
struct uart_dev_s *dev = inode->i_private;
#endif
int ret = OK;
switch (cmd)
{
#ifdef CONFIG_SERIAL_TIOCSERGSTRUCT
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;
#endif
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;
uint32_t rxd;
/* Get the Rx byte + 4 bits of error information. Return those in status */
rxd = up_serialin(priv, TIVA_UART_DR_OFFSET);
*status = rxd;
/* The lower 8bits of the Rx data is the actual recevied byte */
return rxd & 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 their is anything in the Rx FIFO (or an Rx
* timeout occurs.
*/
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->im |= (UART_IM_RXIM|UART_IM_RTIM);
#endif
}
else
{
priv->im &= ~(UART_IM_RXIM|UART_IM_RTIM);
}
up_serialout(priv, TIVA_UART_IM_OFFSET, priv->im);
}
/****************************************************************************
* 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, TIVA_UART_FR_OFFSET) & UART_FR_RXFE) == 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, TIVA_UART_DR_OFFSET, (uint32_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;
irqstate_t flags;
flags = irqsave();
if (enable)
{
/* Set to receive an interrupt when the TX fifo is half emptied */
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->im |= UART_IM_TXIM;
up_serialout(priv, TIVA_UART_IM_OFFSET, priv->im);
/* The serial driver wants an interrupt here, but will not get get
* one unless we "prime the pump." I believe that this is because
* behave like a level interrupt and the Stellaris interrupts behave
* (at least by default) like edge interrupts.
*
* In any event, faking a TX interrupt here solves the problem;
* Call uart_xmitchars() just as would have been done if we recieved
* the TX interrupt.
*/
uart_xmitchars(dev);
#endif
}
else
{
/* Disable the TX interrupt */
priv->im &= ~UART_IM_TXIM;
up_serialout(priv, TIVA_UART_IM_OFFSET, priv->im);
}
irqrestore(flags);
}
/****************************************************************************
* 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, TIVA_UART_FR_OFFSET) & UART_FR_TXFF) == 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, TIVA_UART_FR_OFFSET) & UART_FR_TXFE) != 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
#ifdef TTYS4_DEV
up_disableuartint(TTYS4_DEV.priv, NULL);
#endif
#ifdef TTYS5_DEV
up_disableuartint(TTYS5_DEV.priv, NULL);
#endif
#ifdef TTYS6_DEV
up_disableuartint(TTYS6_DEV.priv, NULL);
#endif
#ifdef TTYS7_DEV
up_disableuartint(TTYS7_DEV.priv, NULL);
#endif
/* Configure whichever one is the console */
#ifdef HAVE_SERIAL_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_SERIAL_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
#ifdef TTYS4_DEV
(void)uart_register("/dev/ttyS4", &TTYS4_DEV);
#endif
#ifdef TTYS5_DEV
(void)uart_register("/dev/ttyS5", &TTYS5_DEV);
#endif
#ifdef TTYS6_DEV
(void)uart_register("/dev/ttyS6", &TTYS6_DEV);
#endif
#ifdef TTYS7_DEV
(void)uart_register("/dev/ttyS7", &TTYS7_DEV);
#endif
}
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#ifdef HAVE_SERIAL_CONSOLE
struct up_dev_s *priv = (struct up_dev_s*)CONSOLE_DEV.priv;
uint32_t im;
up_disableuartint(priv, &im);
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_waittxnotfull(priv);
up_serialout(priv, TIVA_UART_DR_OFFSET, (uint32_t)'\r');
}
up_waittxnotfull(priv);
up_serialout(priv, TIVA_UART_DR_OFFSET, (uint32_t)ch);
up_waittxnotfull(priv);
up_restoreuartint(priv, im);
#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_SERIAL_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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