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nuttx-bb/nuttx/arch/arm/src/lpc17xx/lpc17_serial.c

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/****************************************************************************
* arch/arm/src/lpc17xx/lpc17_serial.c
*
* Copyright (C) 2010-2012 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>
#ifdef CONFIG_SERIAL_TERMIOS
# include <termios.h>
#endif
#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 "os_internal.h"
#include "up_internal.h"
#include "lpc17_internal.h"
#include "lpc17_uart.h"
#include "lpc17_serial.h"
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
/* If we are not using the serial driver for the console, then we still must
* provide some minimal implementation of up_putc.
*/
#if defined(USE_SERIALDRIVER) && defined(HAVE_UART)
/* Configuration ************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
uint32_t uartbase; /* Base address of UART registers */
uint32_t baud; /* Configured baud */
uint32_t ier; /* Saved IER 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) */
uint8_t cclkdiv; /* Divisor needed to get PCLK from CCLK */
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
****************************************************************************/
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_LPC17_UART0
static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE];
static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE];
#endif
#ifdef CONFIG_LPC17_UART1
static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE];
static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE];
#endif
#ifdef CONFIG_LPC17_UART2
static char g_uart2rxbuffer[CONFIG_UART2_RXBUFSIZE];
static char g_uart2txbuffer[CONFIG_UART2_TXBUFSIZE];
#endif
#ifdef CONFIG_LPC17_UART3
static char g_uart3rxbuffer[CONFIG_UART3_RXBUFSIZE];
static char g_uart3txbuffer[CONFIG_UART3_TXBUFSIZE];
#endif
/* This describes the state of the LPC17xx uart0 port. */
#ifdef CONFIG_LPC17_UART0
static struct up_dev_s g_uart0priv =
{
.uartbase = LPC17_UART0_BASE,
.baud = CONFIG_UART0_BAUD,
.irq = LPC17_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 LPC17xx uart1 port. */
#ifdef CONFIG_LPC17_UART1
static struct up_dev_s g_uart1priv =
{
.uartbase = LPC17_UART1_BASE,
.baud = CONFIG_UART1_BAUD,
.irq = LPC17_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 LPC17xx uart1 port. */
#ifdef CONFIG_LPC17_UART2
static struct up_dev_s g_uart2priv =
{
.uartbase = LPC17_UART2_BASE,
.baud = CONFIG_UART2_BAUD,
.irq = LPC17_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 LPC17xx uart1 port. */
#ifdef CONFIG_LPC17_UART3
static struct up_dev_s g_uart3priv =
{
.uartbase = LPC17_UART3_BASE,
.baud = CONFIG_UART3_BAUD,
.irq = LPC17_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
/* Which UART with be tty0/console and which tty1? tty2? tty3? */
#ifdef HAVE_CONSOLE
# if defined(CONFIG_UART0_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart0port /* UART0=console */
# define TTYS0_DEV g_uart0port /* UART0=ttyS0 */
# ifdef CONFIG_LPC17_UART1
# define TTYS1_DEV g_uart1port /* UART0=ttyS0;UART1=ttyS1 */
# ifdef CONFIG_LPC17_UART2
# define TTYS2_DEV g_uart2port /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS2 */
# ifdef CONFIG_LPC17_UART3
# define TTYS3_DEV g_uart3port /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS2;UART3=ttyS3 */
# else
# undef TTYS3_DEV /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS;No ttyS3 */
# endif
# else
# ifdef CONFIG_LPC17_UART3
# define TTYS2_DEV g_uart3port /* UART0=ttyS0;UART1=ttyS1;UART3=ttys2;No ttyS3 */
# else
# undef TTYS2_DEV /* UART0=ttyS0;UART1=ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS3_DEV /* No ttyS3 */
# endif
# else
# ifdef CONFIG_LPC17_UART2
# define TTYS1_DEV g_uart2port /* UART0=ttyS0;UART2=ttyS1;No ttyS3 */
# ifdef CONFIG_LPC17_UART3
# define TTYS2_DEV g_uart3port /* UART0=ttyS0;UART2=ttyS1;UART3=ttyS2;No ttyS3 */
# else
# undef TTYS2_DEV /* UART0=ttyS0;UART2=ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS3_DEV /* No ttyS3 */
# else
# ifdef CONFIG_LPC17_UART3
# define TTYS1_DEV g_uart3port /* UART0=ttyS0;UART3=ttyS1;No ttyS2;No ttyS3 */
# else
# undef TTYS1_DEV /* UART0=ttyS0;No ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS2_DEV /* No ttyS2 */
# undef TTYS3_DEV /* No ttyS3 */
# endif
# endif
# elif defined(CONFIG_UART1_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart1port /* UART1=console */
# define TTYS0_DEV g_uart1port /* UART1=ttyS0 */
# ifdef CONFIG_LPC17_UART0
# define TTYS1_DEV g_uart0port /* UART1=ttyS0;UART0=ttyS1 */
# ifdef CONFIG_LPC17_UART2
# define TTYS2_DEV g_uart2port /* UART1=ttyS0;UART0=ttyS1;UART2=ttyS2 */
# ifdef CONFIG_LPC17_UART3
# define TTYS3_DEV g_uart3port /* UART1=ttyS0;UART0=ttyS1;UART2=ttyS2;UART3=ttyS3 */
# else
# undef TTYS3_DEV /* UART1=ttyS0;UART0=ttyS1;UART2=ttyS;No ttyS3 */
# endif
# else
# ifdef CONFIG_LPC17_UART3
# define TTYS2_DEV g_uart3port /* UART1=ttyS0;UART0=ttyS1;UART3=ttys2;No ttyS3 */
# else
# undef TTYS2_DEV /* UART1=ttyS0;UART0=ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS3_DEV /* No ttyS3 */
# endif
# else
# ifdef CONFIG_LPC17_UART2
# define TTYS1_DEV g_uart2port /* UART1=ttyS0;UART2=ttyS1 */
# ifdef CONFIG_LPC17_UART3
# define TTYS2_DEV g_uart3port /* UART1=ttyS0;UART2=ttyS1;UART3=ttyS2;No ttyS3 */
# else
# undef TTYS2_DEV /* UART1=ttyS0;UART2=ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS3_DEV /* No ttyS3 */
# else
# ifdef CONFIG_LPC17_UART3
# define TTYS1_DEV g_uart3port /* UART1=ttyS0;UART3=ttyS1;No ttyS2;No ttyS3 */
# else
# undef TTYS1_DEV /* UART1=ttyS0;No ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS2_DEV /* No ttyS2 */
# undef TTYS3_DEV /* No ttyS3 */
# endif
# endif
# elif defined(CONFIG_UART2_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart2port /* UART2=console */
# define TTYS0_DEV g_uart2port /* UART2=ttyS0 */
# ifdef CONFIG_LPC17_UART2
# define TTYS1_DEV g_uart0port /* UART2=ttyS0;UART0=ttyS1 */
# ifdef CONFIG_LPC17_UART1
# define TTYS2_DEV g_uart1port /* UART2=ttyS0;UART0=ttyS1;UART1=ttyS2 */
# ifdef CONFIG_LPC17_UART3
# define TTYS3_DEV g_uart3port /* UART2=ttyS0;UART0=ttyS1;UART1=ttyS2;UART3=ttyS3 */
# else
# undef TTYS3_DEV /* UART2=ttyS0;UART0=ttyS1;UART1=ttyS;No ttyS3 */
# endif
# else
# ifdef CONFIG_LPC17_UART3
# define TTYS2_DEV g_uart3port /* UART2=ttyS0;UART0=ttyS1;UART3=ttys2;No ttyS3 */
# else
# undef TTYS2_DEV /* UART2=ttyS0;UART0=ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS3_DEV /* No ttyS3 */
# endif
# else
# ifdef CONFIG_LPC17_UART1
# define TTYS1_DEV g_uart1port /* UART2=ttyS0;UART1=ttyS1 */
# ifdef CONFIG_LPC17_UART3
# define TTYS2_DEV g_uart3port /* UART2=ttyS0;UART1=ttyS1;UART3=ttyS2 */
# else
# undef TTYS2_DEV /* UART2=ttyS0;UART1=ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS3_DEV /* No ttyS3 */
# else
# ifdef CONFIG_LPC17_UART3
# define TTYS1_DEV g_uart3port /* UART2=ttyS0;UART3=ttyS1;No ttyS3 */
# else
# undef TTYS1_DEV /* UART2=ttyS0;No ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS2_DEV /* No ttyS2 */
# undef TTYS3_DEV /* No ttyS3 */
# endif
# endif
# elif defined(CONFIG_UART3_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart3port /* UART3=console */
# define TTYS0_DEV g_uart3port /* UART3=ttyS0 */
# ifdef CONFIG_LPC17_UART0
# define TTYS1_DEV g_uart0port /* UART3=ttyS0;UART0=ttyS1 */
# ifdef CONFIG_LPC17_UART1
# define TTYS2_DEV g_uart1port /* UART3=ttyS0;UART0=ttyS1;UART1=ttyS2 */
# ifdef CONFIG_LPC17_UART2
# define TTYS3_DEV g_uart2port /* UART3=ttyS0;UART0=ttyS1;UART1=ttyS2;UART2=ttyS3 */
# else
# undef TTYS3_DEV /* UART3=ttyS0;UART0=ttyS1;UART1=ttyS;No ttyS3 */
# endif
# else
# ifdef CONFIG_LPC17_UART2
# define TTYS2_DEV g_uart2port /* UART3=ttyS0;UART0=ttyS1;UART2=ttys2;No ttyS3 */
# else
# undef TTYS2_DEV /* UART3=ttyS0;UART0=ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS3_DEV /* No ttyS3 */
# endif
# else
# ifdef CONFIG_LPC17_UART1
# define TTYS1_DEV g_uart1port /* UART3=ttyS0;UART1=ttyS1 */
# ifdef CONFIG_LPC17_UART2
# define TTYS2_DEV g_uart2port /* UART3=ttyS0;UART1=ttyS1;UART2=ttyS2;No ttyS3 */
# else
# undef TTYS2_DEV /* UART3=ttyS0;UART1=ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS3_DEV /* No ttyS3 */
# else
# ifdef CONFIG_LPC17_UART2
# define TTYS1_DEV g_uart2port /* UART3=ttyS0;UART2=ttyS1;No ttyS3;No ttyS3 */
# undef TTYS3_DEV /* UART3=ttyS0;UART2=ttyS1;No ttyS2;No ttyS3 */
# else
# undef TTYS1_DEV /* UART3=ttyS0;No ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS2_DEV /* No ttyS2 */
# undef TTYS3_DEV /* No ttyS3 */
# endif
# endif
# endif
#else /* No console */
# define TTYS0_DEV g_uart0port /* UART0=ttyS0 */
# ifdef CONFIG_LPC17_UART1
# define TTYS1_DEV g_uart1port /* UART0=ttyS0;UART1=ttyS1 */
# ifdef CONFIG_LPC17_UART2
# define TTYS2_DEV g_uart2port /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS2 */
# ifdef CONFIG_LPC17_UART3
# define TTYS3_DEV g_uart3port /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS2;UART3=ttyS3 */
# else
# undef TTYS3_DEV /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS;No ttyS3 */
# endif
# else
# ifdef CONFIG_LPC17_UART3
# define TTYS2_DEV g_uart3port /* UART0=ttyS0;UART1=ttyS1;UART3=ttys2;No ttyS3 */
# else
# undef TTYS2_DEV /* UART0=ttyS0;UART1=ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS3_DEV /* No ttyS3 */
# endif
# else
# ifdef CONFIG_LPC17_UART2
# define TTYS1_DEV g_uart2port /* UART0=ttyS0;UART2=ttyS1;No ttyS3 */
# ifdef CONFIG_LPC17_UART3
# define TTYS2_DEV g_uart3port /* UART0=ttyS0;UART2=ttyS1;UART3=ttyS2;No ttyS3 */
# else
# undef TTYS2_DEV /* UART0=ttyS0;UART2=ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS3_DEV /* No ttyS3 */
# else
# ifdef CONFIG_LPC17_UART3
# define TTYS1_DEV g_uart3port /* UART0=ttyS0;UART3=ttyS1;No ttyS2;No ttyS3 */
# else
# undef TTYS1_DEV /* UART0=ttyS0;No ttyS1;No ttyS2;No ttyS3 */
# endif
# undef TTYS2_DEV /* No ttyS2 */
# undef TTYS3_DEV /* No ttyS3 */
# endif
# endif
#endif /*HAVE_CONSOLE*/
/************************************************************************************
* Inline 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 *ier)
{
if (ier)
{
*ier = priv->ier & UART_IER_ALLIE;
}
priv->ier &= ~UART_IER_ALLIE;
up_serialout(priv, LPC17_UART_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_restoreuartint
****************************************************************************/
static inline void up_restoreuartint(struct up_dev_s *priv, uint32_t ier)
{
priv->ier |= ier & UART_IER_ALLIE;
up_serialout(priv, LPC17_UART_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_enablebreaks
****************************************************************************/
static inline void up_enablebreaks(struct up_dev_s *priv, bool enable)
{
uint32_t lcr = up_serialin(priv, LPC17_UART_LCR_OFFSET);
if (enable)
{
lcr |= UART_LCR_BRK;
}
else
{
lcr &= ~UART_LCR_BRK;
}
up_serialout(priv, LPC17_UART_LCR_OFFSET, lcr);
}
/************************************************************************************
* Name: lpc17_uartcclkdiv
*
* Descrption:
* Select a CCLK divider to produce the UART PCLK. The stratey is to select the
* smallest divisor that results in an solution within range of the 16-bit
* DLM and DLL divisor:
*
* PCLK = CCLK / divisor
* BAUD = PCLK / (16 * DL)
*
* Ignoring the fractional divider for now.
*
* NOTE: This is an inline function. If a typical optimization level is used and
* a constant is provided for the desired frequency, then most of the following
* logic will be optimized away.
*
************************************************************************************/
static inline uint32_t lpc17_uartcclkdiv(uint32_t baud)
{
/* Ignoring the fractional divider, the BAUD is given by:
*
* BAUD = PCLK / (16 * DL), or
* DL = PCLK / BAUD / 16
*
* Where:
*
* PCLK = CCLK / divisor.
*
* Check divisor == 1. This works if the upper limit is met
*
* DL < 0xffff, or
* PCLK / BAUD / 16 < 0xffff, or
* CCLK / BAUD / 16 < 0xffff, or
* CCLK < BAUD * 0xffff * 16
* BAUD > CCLK / 0xffff / 16
*
* And the lower limit is met (we can't allow DL to get very close to one).
*
* DL >= MinDL
* CCLK / BAUD / 16 >= MinDL, or
* BAUD <= CCLK / 16 / MinDL
*/
if (baud < (LPC17_CCLK / 16 / UART_MINDL ))
{
return SYSCON_PCLKSEL_CCLK;
}
/* Check divisor == 2. This works if:
*
* 2 * CCLK / BAUD / 16 < 0xffff, or
* BAUD > CCLK / 0xffff / 8
*
* And
*
* 2 * CCLK / BAUD / 16 >= MinDL, or
* BAUD <= CCLK / 8 / MinDL
*/
else if (baud < (LPC17_CCLK / 8 / UART_MINDL ))
{
return SYSCON_PCLKSEL_CCLK2;
}
/* Check divisor == 4. This works if:
*
* 4 * CCLK / BAUD / 16 < 0xffff, or
* BAUD > CCLK / 0xffff / 4
*
* And
*
* 4 * CCLK / BAUD / 16 >= MinDL, or
* BAUD <= CCLK / 4 / MinDL
*/
else if (baud < (LPC17_CCLK / 4 / UART_MINDL ))
{
return SYSCON_PCLKSEL_CCLK4;
}
/* Check divisor == 8. This works if:
*
* 8 * CCLK / BAUD / 16 < 0xffff, or
* BAUD > CCLK / 0xffff / 2
*
* And
*
* 8 * CCLK / BAUD / 16 >= MinDL, or
* BAUD <= CCLK / 2 / MinDL
*/
else /* if (baud < (LPC17_CCLK / 2 / UART_MINDL )) */
{
return SYSCON_PCLKSEL_CCLK8;
}
}
/************************************************************************************
* Name: lpc17_uart0config, uart1config, uart2config, and uart3config
*
* Descrption:
* Configure the UART. UART0/1/2/3 peripherals are configured using the following
* registers:
*
* 1. Power: In the PCONP register, set bits PCUART0/1/2/3.
* On reset, UART0 and UART 1 are enabled (PCUART0 = 1 and PCUART1 = 1)
* and UART2/3 are disabled (PCUART1 = 0 and PCUART3 = 0).
* 2. Peripheral clock: In the PCLKSEL0 register, select PCLK_UART0 and
* PCLK_UART1; in the PCLKSEL1 register, select PCLK_UART2 and PCLK_UART3.
* 3. Pins: Select UART pins through the PINSEL registers and pin modes
* through the PINMODE registers. UART receive pins should not have
* pull-down resistors enabled.
*
************************************************************************************/
#ifdef CONFIG_LPC17_UART0
static inline void lpc17_uart0config(uint32_t clkdiv)
{
uint32_t regval;
irqstate_t flags;
/* Step 1: Enable power on UART0 */
flags = irqsave();
regval = getreg32(LPC17_SYSCON_PCONP);
regval |= SYSCON_PCONP_PCUART0;
putreg32(regval, LPC17_SYSCON_PCONP);
/* Step 2: Enable clocking on UART */
regval = getreg32(LPC17_SYSCON_PCLKSEL0);
regval &= ~SYSCON_PCLKSEL0_UART0_MASK;
regval |= (clkdiv << SYSCON_PCLKSEL0_UART0_SHIFT);
putreg32(regval, LPC17_SYSCON_PCLKSEL0);
/* Step 3: Configure I/O pins */
lpc17_configgpio(GPIO_UART0_TXD);
lpc17_configgpio(GPIO_UART0_RXD);
irqrestore(flags);
};
#endif
#ifdef CONFIG_LPC17_UART1
static inline void lpc17_uart1config(uint32_t clkdiv)
{
uint32_t regval;
irqstate_t flags;
/* Step 1: Enable power on UART1 */
flags = irqsave();
regval = getreg32(LPC17_SYSCON_PCONP);
regval |= SYSCON_PCONP_PCUART1;
putreg32(regval, LPC17_SYSCON_PCONP);
/* Step 2: Enable clocking on UART */
regval = getreg32(LPC17_SYSCON_PCLKSEL0);
regval &= ~SYSCON_PCLKSEL0_UART1_MASK;
regval |= (clkdiv << SYSCON_PCLKSEL0_UART1_SHIFT);
putreg32(regval, LPC17_SYSCON_PCLKSEL0);
/* Step 3: Configure I/O pins */
lpc17_configgpio(GPIO_UART1_TXD);
lpc17_configgpio(GPIO_UART1_RXD);
#ifdef CONFIG_UART1_FLOWCONTROL
lpc17_configgpio(GPIO_UART1_CTS);
lpc17_configgpio(GPIO_UART1_RTS);
lpc17_configgpio(GPIO_UART1_DCD);
lpc17_configgpio(GPIO_UART1_DSR);
lpc17_configgpio(GPIO_UART1_DTR);
#ifdef CONFIG_UART1_RINGINDICATOR
lpc17_configgpio(GPIO_UART1_RI);
#endif
#endif
irqrestore(flags);
};
#endif
#ifdef CONFIG_LPC17_UART2
static inline void lpc17_uart2config(uint32_t clkdiv)
{
uint32_t regval;
irqstate_t flags;
/* Step 1: Enable power on UART2 */
flags = irqsave();
regval = getreg32(LPC17_SYSCON_PCONP);
regval |= SYSCON_PCONP_PCUART2;
putreg32(regval, LPC17_SYSCON_PCONP);
/* Step 2: Enable clocking on UART */
regval = getreg32(LPC17_SYSCON_PCLKSEL1);
regval &= ~SYSCON_PCLKSEL1_UART2_MASK;
regval |= (clkdiv << SYSCON_PCLKSEL1_UART2_SHIFT);
putreg32(regval, LPC17_SYSCON_PCLKSEL1);
/* Step 3: Configure I/O pins */
lpc17_configgpio(GPIO_UART2_TXD);
lpc17_configgpio(GPIO_UART2_RXD);
irqrestore(flags);
};
#endif
#ifdef CONFIG_LPC17_UART3
static inline void lpc17_uart3config(uint32_t clkdiv)
{
uint32_t regval;
irqstate_t flags;
/* Step 1: Enable power on UART3 */
flags = irqsave();
regval = getreg32(LPC17_SYSCON_PCONP);
regval |= SYSCON_PCONP_PCUART3;
putreg32(regval, LPC17_SYSCON_PCONP);
/* Step 2: Enable clocking on UART */
regval = getreg32(LPC17_SYSCON_PCLKSEL1);
regval &= ~SYSCON_PCLKSEL1_UART3_MASK;
regval |= (clkdiv << SYSCON_PCLKSEL1_UART3_SHIFT);
putreg32(regval, LPC17_SYSCON_PCLKSEL1);
/* Step 3: Configure I/O pins */
lpc17_configgpio(GPIO_UART3_TXD);
lpc17_configgpio(GPIO_UART3_RXD);
irqrestore(flags);
};
#endif
/************************************************************************************
* Name: lpc17_uartdl
*
* Descrption:
* Select a divider to produce the BAUD from the UART PCLK.
*
* BAUD = PCLK / (16 * DL), or
* DL = PCLK / BAUD / 16
*
* Ignoring the fractional divider for now. (If you want to extend this driver
* to support the fractional divider, see lpc43xx_uart.c. The LPC43xx uses
* the same peripheral and that logic could easily leveraged here).
*
************************************************************************************/
static inline uint32_t lpc17_uartdl(uint32_t baud, uint8_t divcode)
{
uint32_t num;
switch (divcode)
{
case SYSCON_PCLKSEL_CCLK4: /* PCLK_peripheral = CCLK/4 */
num = (LPC17_CCLK / 4);
break;
case SYSCON_PCLKSEL_CCLK: /* PCLK_peripheral = CCLK */
num = LPC17_CCLK;
break;
case SYSCON_PCLKSEL_CCLK2: /* PCLK_peripheral = CCLK/2 */
num = (LPC17_CCLK / 2);
break;
case SYSCON_PCLKSEL_CCLK8: /* PCLK_peripheral = CCLK/8 (except CAN1, CAN2, and CAN) */
default:
num = (LPC17_CCLK / 8);
break;
}
return num / (baud << 4);
}
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* 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_LPC17_UART_CONFIG
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
uint16_t dl;
uint32_t lcr;
/* Clear fifos */
up_serialout(priv, LPC17_UART_FCR_OFFSET, (UART_FCR_RXRST|UART_FCR_TXRST));
/* Set trigger */
up_serialout(priv, LPC17_UART_FCR_OFFSET, (UART_FCR_FIFOEN|UART_FCR_RXTRIGGER_8));
/* Set up the IER */
priv->ier = up_serialin(priv, LPC17_UART_IER_OFFSET);
/* Set up the LCR */
lcr = 0;
if (priv->bits == 7)
{
lcr |= UART_LCR_WLS_7BIT;
}
else
{
lcr |= UART_LCR_WLS_8BIT;
}
if (priv->stopbits2)
{
lcr |= UART_LCR_STOP;
}
if (priv->parity == 1)
{
lcr |= (UART_LCR_PE|UART_LCR_PS_ODD);
}
else if (priv->parity == 2)
{
lcr |= (UART_LCR_PE|UART_LCR_PS_EVEN);
}
/* Enter DLAB=1 */
up_serialout(priv, LPC17_UART_LCR_OFFSET, (lcr | UART_LCR_DLAB));
/* Set the BAUD divisor */
dl = lpc17_uartdl(priv->baud, priv->cclkdiv);
up_serialout(priv, LPC17_UART_DLM_OFFSET, dl >> 8);
up_serialout(priv, LPC17_UART_DLL_OFFSET, dl & 0xff);
/* Clear DLAB */
up_serialout(priv, LPC17_UART_LCR_OFFSET, lcr);
/* Configure the FIFOs */
up_serialout(priv, LPC17_UART_FCR_OFFSET,
(UART_FCR_RXTRIGGER_8|UART_FCR_TXRST|UART_FCR_RXRST|UART_FCR_FIFOEN));
/* Enable Auto-RTS and Auto-CS Flow Control in the Modem Control Register */
#ifdef CONFIG_UART1_FLOWCONTROL
if (priv->uartbase == LPC17_UART1_BASE)
{
up_serialout(priv, LPC17_UART_MCR_OFFSET, (UART_MCR_RTSEN|UART_MCR_CTSEN));
}
#endif
#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);
}
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
* appropriate 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 status;
int passes;
#ifdef CONFIG_LPC17_UART0
if (g_uart0priv.irq == irq)
{
dev = &g_uart0port;
}
else
#endif
#ifdef CONFIG_LPC17_UART1
if (g_uart1priv.irq == irq)
{
dev = &g_uart1port;
}
else
#endif
#ifdef CONFIG_LPC17_UART2
if (g_uart2priv.irq == irq)
{
dev = &g_uart2port;
}
else
#endif
#ifdef CONFIG_LPC17_UART3
if (g_uart3priv.irq == irq)
{
dev = &g_uart3port;
}
else
#endif
{
PANIC(OSERR_INTERNAL);
}
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.
*/
for (passes = 0; passes < 256; passes++)
{
/* Get the current UART status and check for loop
* termination conditions
*/
status = up_serialin(priv, LPC17_UART_IIR_OFFSET);
/* The UART_IIR_INTSTATUS bit should be zero if there are pending
* interrupts
*/
if ((status & UART_IIR_INTSTATUS) != 0)
{
/* Break out of the loop when there is no longer a
* pending interrupt
*/
break;
}
/* Handle the interrupt by its interrupt ID field */
switch (status & UART_IIR_INTID_MASK)
{
/* Handle incoming, receive bytes (with or without timeout) */
case UART_IIR_INTID_RDA:
case UART_IIR_INTID_CTI:
{
uart_recvchars(dev);
break;
}
/* Handle outgoing, transmit bytes */
case UART_IIR_INTID_THRE:
{
uart_xmitchars(dev);
break;
}
/* Just clear modem status interrupts (UART1 only) */
case UART_IIR_INTID_MSI:
{
/* Read the modem status register (MSR) to clear */
status = up_serialin(priv, LPC17_UART_MSR_OFFSET);
vdbg("MSR: %02x\n", status);
break;
}
/* Just clear any line status interrupts */
case UART_IIR_INTID_RLS:
{
/* Read the line status register (LSR) to clear */
status = up_serialin(priv, LPC17_UART_LSR_OFFSET);
vdbg("LSR: %02x\n", status);
break;
}
/* There should be no other values */
default:
{
dbg("Unexpected IIR: %02x\n", status);
break;
}
}
}
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;
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
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;
case TIOCSBRK: /* BSD compatibility: Turn break on, unconditionally */
{
irqstate_t flags = irqsave();
up_enablebreaks(priv, true);
irqrestore(flags);
}
break;
case TIOCCBRK: /* BSD compatibility: Turn break off, unconditionally */
{
irqstate_t flags;
flags = irqsave();
up_enablebreaks(priv, false);
irqrestore(flags);
}
break;
#ifdef CONFIG_SERIAL_TERMIOS
case TCGETS:
{
struct termios *termiosp = (struct termios*)arg;
if (!termiosp)
{
ret = -EINVAL;
break;
}
/* TODO: Other termios fields are not yet returned.
* Note that cfsetospeed is not necessary because we have
* knowledge that only one speed is supported.
* Both cfset(i|o)speed() translate to cfsetspeed.
*/
cfsetispeed(termiosp, priv->baud);
}
break;
case TCSETS:
{
struct termios *termiosp = (struct termios*)arg;
uint32_t lcr; /* Holds current values of line control register */
uint16_t dl; /* Divisor latch */
if (!termiosp)
{
ret = -EINVAL;
break;
}
/* TODO: Handle other termios settings.
* Note that only cfgetispeed is used because we have knowledge
* that only one speed is supported.
*/
/* Get the c_speed field in the termios struct */
priv->baud = cfgetispeed(termiosp);
/* DLAB open latch */
lcr = getreg32(priv->uartbase + LPC17_UART_LCR_OFFSET);
up_serialout(priv, LPC17_UART_LCR_OFFSET, (lcr | UART_LCR_DLAB));
/* Set the BAUD divisor */
dl = lpc17_uartdl(priv->baud, priv->cclkdiv);
up_serialout(priv, LPC17_UART_DLM_OFFSET, dl >> 8);
up_serialout(priv, LPC17_UART_DLL_OFFSET, dl & 0xff);
/* Clear DLAB */
up_serialout(priv, LPC17_UART_LCR_OFFSET, lcr);
}
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 rbr;
*status = up_serialin(priv, LPC17_UART_LSR_OFFSET);
rbr = up_serialin(priv, LPC17_UART_RBR_OFFSET);
return rbr;
}
/****************************************************************************
* 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)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->ier |= UART_IER_RBRIE;
#endif
}
else
{
priv->ier &= ~UART_IER_RBRIE;
}
up_serialout(priv, LPC17_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, LPC17_UART_LSR_OFFSET) & UART_LSR_RDR) != 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, LPC17_UART_THR_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)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->ier |= UART_IER_THREIE;
up_serialout(priv, LPC17_UART_IER_OFFSET, priv->ier);
/* Fake a TX interrupt here by just calling uart_xmitchars() with
* interrupts disabled (note this may recurse).
*/
uart_xmitchars(dev);
#endif
}
else
{
priv->ier &= ~UART_IER_THREIE;
up_serialout(priv, LPC17_UART_IER_OFFSET, priv->ier);
}
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, LPC17_UART_LSR_OFFSET) & UART_LSR_THRE) != 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, LPC17_UART_LSR_OFFSET) & UART_LSR_THRE) != 0);
}
/****************************************************************************
* Public Funtions
****************************************************************************/
/****************************************************************************
* 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.
*
* NOTE: Configuration of the CONSOLE UART was performed by up_lowsetup()
* very early in the boot sequence.
*
****************************************************************************/
void up_earlyserialinit(void)
{
/* Configure all UARTs (except the CONSOLE UART) and disable interrupts */
#ifdef CONFIG_LPC17_UART0
g_uart0priv.cclkdiv = lpc17_uartcclkdiv(CONFIG_UART0_BAUD);
#ifndef CONFIG_UART0_SERIAL_CONSOLE
lpc17_uart0config(g_uart0priv.cclkdiv);
#endif
up_disableuartint(&g_uart0priv, NULL);
#endif
#ifdef CONFIG_LPC17_UART1
g_uart1priv.cclkdiv = lpc17_uartcclkdiv(CONFIG_UART1_BAUD);
#ifndef CONFIG_UART1_SERIAL_CONSOLE
lpc17_uart1config(g_uart1priv.cclkdiv);
#endif
up_disableuartint(&g_uart1priv, NULL);
#endif
#ifdef CONFIG_LPC17_UART2
g_uart2priv.cclkdiv = lpc17_uartcclkdiv(CONFIG_UART2_BAUD);
#ifndef CONFIG_UART2_SERIAL_CONSOLE
lpc17_uart2config(g_uart2priv.cclkdiv);
#endif
up_disableuartint(&g_uart2priv, NULL);
#endif
#ifdef CONFIG_LPC17_UART3
g_uart3priv.cclkdiv = lpc17_uartcclkdiv(CONFIG_UART3_BAUD);
#ifndef CONFIG_UART3_SERIAL_CONSOLE
lpc17_uart3config(g_uart3priv.cclkdiv);
#endif
up_disableuartint(&g_uart3priv, NULL);
#endif
/* Configuration whichever one is the console */
#ifdef CONSOLE_DEV
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)
{
#ifdef CONSOLE_DEV
(void)uart_register("/dev/console", &CONSOLE_DEV);
#endif
#ifdef TTYS0_DEV
(void)uart_register("/dev/ttyS0", &TTYS0_DEV);
#endif
#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;
uint32_t ier;
up_disableuartint(priv, &ier);
#endif
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_lowputc('\r');
}
up_lowputc(ch);
#ifdef HAVE_CONSOLE
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_UART
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_lowputc('\r');
}
up_lowputc(ch);
#endif
return ch;
}
#endif /* USE_SERIALDRIVER */
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