/****************************************************************************
* arch/sh/src/m16c/m16c_serial.c
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <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 "m16c_uart.h"
/* Is there any serial support? This might be the case if the board does
* not have serial ports but supports a console through, say, an LCD.
*/
#if !defined(CONFIG_UART0_DISABLE) && !defined(CONFIG_UART1_DISABLE) && !defined(CONFIG_UART2_DISABLE)
/****************************************************************************
* Definitions
****************************************************************************/
/* Configuration **********************************************************/
#ifndef M16C_XIN_PRESCALER
# define M16C_XIN_PRESCALER 1
#endif
/* Make sure interrupt priorities are defined. If not, use a default of 5 */
#ifndef M16C_S2T_PRIO
# define M16C_S2T_PRIO 5 /* UART2 transmit interrupt priority */
#endif
#ifndef M16C_S2R_PRIO
# define M16C_S2R_PRIO 5 /* UART2 receive interrupt priority */
#endif
#ifndef M16C_S0T_PRIO
# define M16C_S0T_PRIO 5 /* UART0 transmit interrupt priority */
#endif
#ifndef M16C_S0R_PRIO
# define M16C_S0R_PRIO 5 /* UART0 receive interrupt priority */
#endif
#ifndef M16C_S1T_PRIO
# define M16C_S1T_PRIO 5 /* UART1 transmit interrupt priority */
#endif
#ifndef M16C_S1R_PRIO
# define M16C_S1R_PRIO 5 /* UART1 receive interrupt priority */
#endif
/* Some sanity checks *******************************************************/
/* Are there any UARTs? */
#if defined(CONFIG_UART0_DISABLE) && defined(CONFIG_UART1_DISABLE) && defined(CONFIG_UART2_DISABLE)
# ifdef CONFIG_USE_SERIALDRIVER
# error "Serial driver selected, but UARTs not enabled"
# undef CONFIG_USE_SERIALDRIVER
# endif
#endif
/* Is there a serial console? */
#if defined(CONFIG_UART0_SERIAL_CONSOLE) && !defined(CONFIG_UART0_DISABLE)
# define HAVE_SERIALCONSOLE 1
# undef CONFIG_UART1_SERIAL_CONSOLE
# undef CONFIG_UART2_SERIAL_CONSOLE
#elif defined(CONFIG_UART1_SERIAL_CONSOLE) && !defined(CONFIG_UART1_DISABLE)
# define HAVE_SERIALCONSOLE 1
# undef CONFIG_UART0_SERIAL_CONSOLE
# undef CONFIG_UART2_SERIAL_CONSOLE
#elif defined(CONFIG_UART2_SERIAL_CONSOLE) && !defined(CONFIG_UART2_DISABLE)
# define HAVE_SERIALCONSOLE 1
# undef CONFIG_UART0_SERIAL_CONSOLE
# undef CONFIG_UART1_SERIAL_CONSOLE
#else
# if defined(CONFIG_UART0_SERIAL_CONSOLE) || defined(CONFIG_UART1_SERIAL_CONSOLE)|| defined(CONFIG_UART2_SERIAL_CONSOLE)
# error "Serial console selected, but corresponding UART not enabled"
# endif
# undef HAVE_SERIALCONSOLE
# undef CONFIG_UART0_SERIAL_CONSOLE
# undef CONFIG_UART1_SERIAL_CONSOLE
# undef CONFIG_UART2_SERIAL_CONSOLE
#endif
#if defined(HAVE_SERIALCONSOLE) && defined(CONFIG_LCD_CONSOLE)
# error "Both serial and LCD consoles are defined"
#elif !defined(HAVE_SERIALCONSOLE) && !defined(CONFIG_LCD_CONSOLE)
# warning "No console is defined"
#endif
#ifdef CONFIG_USE_SERIALDRIVER
/* Which UART with be tty0/console and which tty1 and tty2? */
/* CONFIG_UART0_SERIAL_CONSOLE (implies CONFIG_UART0_DISABLE also un-defined) */
#if defined(CONFIG_UART0_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart0port /* UART0 is console */
# define TTYS0_DEV g_uart0port /* UART0 is tty0 */
# ifndef CONFIG_UART1_DISABLE
# define TTYS1_DEV g_uart1port /* UART1 is tty1 */
# ifndef CONFIG_UART2_DISABLE
# define TTYS2_DEV g_uart2port /* UART2 is tty2 */
# endif
# else
# ifndef CONFIG_UART2_DISABLE
# define TTYS2_DEV g_uart2port /* UART2 is tty1 */
# else
# undef TTYS1_DEV /* No tty1 */
# endif
# undef TTYS2_DEV /* No tty2 */
# endif
/* CONFIG_UART1_SERIAL_CONSOLE (implies CONFIG_UART1_DISABLE also un-defined) */
#elif defined(CONFIG_UART1_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart1port /* UART1 is console */
# define TTYS0_DEV g_uart1port /* UART1 is tty0 */
# ifndef CONFIG_UART0_DISABLE
# define TTYS1_DEV g_uart0port /* UART0 is tty1 */
# ifndef CONFIG_UART2_DISABLE
# define TTYS2_DEV g_uart2port /* UART2 is tty2 */
# endif
# else
# ifndef CONFIG_UART2_DISABLE
# define TTYS2_DEV g_uart2port /* UART2 is tty1 */
# else
# undef TTYS1_DEV /* No tty1 */
# endif
# undef TTYS2_DEV /* No tty2 */
# endif
/* CONFIG_UART2_SERIAL_CONSOLE (implies CONFIG_UART2_DISABLE also un-defined) */
#elif defined(CONFIG_UART2_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart2port /* UART2 is console */
# define TTYS0_DEV g_uart2port /* UART2 is tty0 */
# ifndef CONFIG_UART0_DISABLE
# define TTYS1_DEV g_uart0port /* UART0 is tty1 */
# ifndef CONFIG_UART1_DISABLE
# define TTYS2_DEV g_uart1port /* UART1 is tty2 */
# endif
# else
# ifndef CONFIG_UART1_DISABLE
# define TTYS1_DEV g_uart1port /* UART1 is tty1 */
# else
# undef TTYS1_DEV /* No tty1 */
# endif
# undef TTYS2_DEV /* No tty2 */
# endif
/* No console, at least one of CONFIG_UART0/1/2_DISABLE defined */
#elif !defined(CONFIG_UART0_DISABLE)
# undef CONSOLE_DEV /* No console */
# define TTYS0_DEV g_uart0port /* UART0 is tty0 */
# ifndef CONFIG_UART1_DISABLE
# define TTYS1_DEV g_uart1port /* UART1 is tty1 */
# ifndef CONFIG_UART2_DISABLE
# define TTYS2_DEV g_uart2port /* UART2 is tty2 */
# endif
# else
# ifndef CONFIG_UART2_DISABLE
# define TTYS1_DEV g_uart1port /* UART2 is tty1 */
# else
# undef TTYS1_DEV /* No tty1 */
# endif
# undef TTYS2_DEV /* No tty2 */
# endif
elif !defined(CONFIG_UART1_DISABLE)
# undef CONSOLE_DEV /* No console */
# undef TTYS2_DEV /* No tty2 */
# define TTYS0_DEV g_uart1port /* UART1 is tty0 */
# ifndef CONFIG_UART2_DISABLE
# define TTYS1_DEV g_uart2port /* UART2 is tty1 */
# else
# undef TTYS1_DEV /* No tty1 */
# endif
/* Otherwise, there is no console and only CONFIG_UART2_DISABLE is un-defined */
#else
# undef CONSOLE_DEV /* No console */
# define TTYS0_DEV g_uart2port /* UART2 is tty0 */
# undef TTYS1_DEV /* No tty1 */
# undef TTYS1_DEV /* No tty2 */
#endif
/* Definitions for the enable field of the device structure */
#define M16C_RXENABLED 0x01
#define M16C_TXENABLED 0x02
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
uint32 baud; /* Configured baud */
uint16 uartbase; /* Base address of UART registers */
ubyte uartno; /* UART number */
volatile ubyte ucon; /* Saved SCR value */
volatile ubyte ssr; /* Saved SR value (only used during interrupt processing) */
ubyte rcvirq; /* UART receive data available IRQ */
ubyte xmtirq; /* UART transmit complete IRQ */
ubyte enables; /* Bit 0: 1=RX enabled, Bit 1: 1=TX enabled */
ubyte parity; /* 0=none, 1=odd, 2=even */
ubyte bits; /* Number of bits (7 or 8) */
boolean 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_rcvinterrupt(int irq, void *context);
static int up_receive(struct uart_dev_s *dev, unsigned int *status);
static void m16c_rxint(struct up_dev_s *dev, boolean enable);
static void up_rxint(struct uart_dev_s *dev, boolean enable);
static boolean up_rxavailable(struct uart_dev_s *dev);
static int up_xmtinterrupt(int irq, void *context);
static void up_send(struct uart_dev_s *dev, int ch);
static void m16c_txint(struct up_dev_s *dev, boolean enable);
static void up_txint(struct uart_dev_s *dev, boolean enable);
static boolean up_txready(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,
.receive = up_receive,
.rxint = up_rxint,
.rxavailable = up_rxavailable,
.send = up_send,
.txint = up_txint,
.txready = up_txready,
.txempty = up_txready,
};
/* I/O buffers */
#ifndef CONFIG_UART0_DISABLE
static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE];
static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE];
#endif
#ifndef CONFIG_UART1_DISABLE
static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE];
static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE];
#endif
#ifndef CONFIG_UART2_DISABLE
static char g_uart2rxbuffer[CONFIG_UART2_RXBUFSIZE];
static char g_uart2txbuffer[CONFIG_UART2_TXBUFSIZE];
#endif
/* This describes the state of the M16C UART0 port. */
#ifndef CONFIG_UART0_DISABLE
static struct up_dev_s g_uart0priv =
{
.baud = CONFIG_UART0_BAUD,
.uartbase = M16C_UART0_BASE,
.uartno = 0,
.rcvirq = M16C_UART0RCV_IRQ,
.xmtirq = M16C_UART0XMT_IRQ,
.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 M16C UART1 port. */
#ifndef CONFIG_UART1_DISABLE
static struct up_dev_s g_uart1priv =
{
.baud = CONFIG_UART1_BAUD,
.uartbase = M16C_UART1_BASE,
.uartno = 1,
.rcvirq = M16C_UART1RCV_IRQ,
.xmtirq = M16C_UART1XMT_IRQ,
.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 M16C UART2 port. */
#ifndef CONFIG_UART2_DISABLE
static struct up_dev_s g_uart2priv =
{
.baud = CONFIG_UART2_BAUD,
.uartbase = M16C_UART2_BASE,
.uartno = 2,
.rcvirq = M16C_UART2RCV_IRQ,
.xmtirq = M16C_UART2XMT_IRQ,
.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
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialin
****************************************************************************/
static inline ubyte up_serialin(struct up_dev_s *priv, int offset)
{
return getreg8(priv->uartbase + offset);
}
/****************************************************************************
* Name: up_serialin16
****************************************************************************/
static inline uint16 up_serialin16(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, ubyte value)
{
putreg8(value, priv->uartbase + offset);
}
/****************************************************************************
* Name: up_serialout16
****************************************************************************/
static inline void up_serialout16(struct up_dev_s *priv, int offset, uint16 value)
{
putreg16(value, priv->uartbase + offset);
}
/****************************************************************************
* Name: up_disableuartint
****************************************************************************/
static inline void up_disableuartint(struct up_dev_s *priv, ubyte *penables)
{
ubyte enables = priv->enables;
m16c_txint(priv, FALSE);
m16c_rxint(priv, FALSE);
if (enables)
{
*penables = enables;
}
}
/****************************************************************************
* Name: up_restoreuartint
****************************************************************************/
static inline void up_restoreuartint(struct up_dev_s *priv, ubyte enables)
{
m16c_rxint(priv, (enables & M16C_RXENABLED) != 0);
m16c_txint(priv, (enables & M16C_TXENABLED) != 0);
}
/****************************************************************************
* Name: up_waittxready
****************************************************************************/
#ifdef HAVE_SERIALCONSOLE
static inline void up_waittxready(struct up_dev_s *priv)
{
int tmp;
/* Limit how long we will wait for the TDR empty condition */
for (tmp = 1000 ; tmp > 0 ; tmp--)
{
/* Check the TI bit in the CI register. 1=Transmit buffer empty */
if ((up_serialin(priv, M16C_UART_C1) & UART_C1_TI) != 0);
{
/* The transmit buffer is empty... return */
break;
}
}
}
#endif
/****************************************************************************
* Name: ub_setbrg
*
* Description:
* Calculate the correct value for the BRG given the configured frequency
* and the desired BAUD settings.
*
****************************************************************************/
static inline void ub_setbrg(struct up_dev_s *priv, unsigned int baud)
{
uint16 brg;
/* The Bit Rate Generator (BRG) value can be calculated by:
*
* BRG = source-frequency / prescaler / 16 / baud rate - 1
*
* Example:
* source-frequency = 20,000,000 (20MHz)
* prescaler = 1
* baud rate = 19200
* BRG = 20,000,000/1/16/19200 - 1 = 64
*/
brg = (M16C_XIN_FREQ / (16L * M16C_XIN_PRESCALER * (uint32)baud)) - 1;
up_serialout(priv, M16C_UART_BRG, brg);
}
/****************************************************************************
* 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;
ubyte regval;
/* Set the baud rate generator */
ub_setbrg(priv, priv->baud);
/* Disable CTS/RTS */
up_serialout(priv, M16C_UART_C0, UART_C0_CRD);
/* Disable RX/TX interrupts */
m16c_rxint(priv, FALSE);
m16c_txint(priv, FALSE);
/* Set interrupt cause=TX complete and continuous receive mode */
#ifndef CONFIG_UART0_DISABLE
if (priv->uartno == 0)
{
regval = getreg8(M16C_UCON);
regval |= (UART_CON_U0IRS|UART_CON_U0RRM);
putreg8(regval, M16C_UCON);
}
else
#endif
#ifndef CONFIG_UART1_DISABLE
if (priv->uartno == 1)
{
regval = getreg8(M16C_UCON);
regval |= (UART_CON_U1IRS|UART_CON_U1RRM);
putreg8(regval, M16C_UCON);
}
else
#endif
#ifndef CONFIG_UART2_DISABLE
if (priv->uartno == 2)
{
regval = getreg8(M16C_U2C1);
regval |= ((UART_C1_U2IRS|UART_C1_U2RRM);
putreg8(regval, M16C_U2C1);
}
else
#endif
{
dbg("Invalid UART #\n");
}
/* Set UART transmit/receive control register 1 to enable transmit and receive */
up_serialout(priv, M16C_UART_C1, UART_C1_TE|UART_C1_RE);
/* Set UART transmit/receive mode register data bits, stop bits, parity */
regval = 0;
if (priv->bits == 7)
{
regval |= UART_MR_SMD7BITS;
}
else if (priv->bits == 8)
{
regval |= UART_MR_SMD8BITS;
}
else if (priv->bits == 9)
{
regval |= UART_MR_SMD9BITS;
}
else
{
dbg("Invalid bits=%d\n", priv->bits);
}
if (priv->parity != 0)
{
regval |= UART_MR_PRYE;
if (priv->parity == 2)
{
regval |= UART_MR_PRY;
}
}
if (priv->stopbits2)
{
regval |= UART_MR_STPS;
}
up_serialout(priv, M16C_UART_MR, regval);
/* Set port direction registers for Rx/TX pins */
#ifndef CONFIG_UART0_DISABLE
if (priv->uartno == 0)
{
regval = getreg8(M16C_PD6);
regval &= ~(1 << 2); /* PD6-2:RxD1 */
regval |= (1 << 3); /* PD6-3:TxD1 */
putreg8(regval, M16C_PD6);
}
else
#endif
#ifndef CONFIG_UART1_DISABLE
if (priv->uartno == 1)
{
regval = getreg8(M16C_PD6);
regval &= ~(1 << 6); /* PD6-6:RxD1 */
regval |= (1 << 7); /* PD6-7:TxD1 */
putreg8(regval, M16C_PD6);
}
else
#endif
#ifndef CONFIG_UART2_DISABLE
if (priv->uartno == 2)
{
regval = getreg8(M16C_PD7);
regval &= ~(1 << 1); /* PD7-1:RxD1 */
regval &= (1 << 0); /* PD7-0:TxD1 */
putreg8(regval, M16C_PD7);
}
else
#endif
{
dbg("Invalid UART #\n");
}
/* Read any data left in the RX fifo */
regval = (ubyte)up_serialin16(priv, M16C_UART_RB);
#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 the UART receive data available IRQ */
ret = irq_attach(priv->rcvirq, up_rcvinterrupt);
if (ret == OK)
{
/* Attach the UART transmit complete IRQ */
ret = irq_attach(priv->xmtirq, up_xmtinterrupt);
if (ret != OK)
{
/* Detach the ERI interrupt on failure */
(void)irq_detach(priv->rcvirq);
}
}
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;
/* Disable all UART interrupts */
up_disableuartint(priv, NULL);
/* Detach the UART interrupts */
(void)irq_detach(priv->rcvirq);
(void)irq_detach(priv->xmtirq);
}
/****************************************************************************
* Name: up_recvinterrupt
*
* Description:
* This is the UART receive interrupt handler. It will be invoked when an
* interrupt received on the 'irq' It should call uart_receivechar to
* perform the appropriate data transfer. The interrupt handling logic
* must be able to map the 'irq' number into the approprite up_dev_s
* structure in order to call these functions.
*
****************************************************************************/
static int up_rcvinterrupt(int irq, void *context)
{
struct uart_dev_s *dev = NULL;
#ifndef CONFIG_UART0_DISABLE
if (irq == g_uart0priv.rcvirq)
{
dev = &g_uart0port;
}
else
#endif
#ifndef CONFIG_UART1_DISABLE
if (irq == g_uart1priv.rcvirq)
{
dev = &g_uart1port;
}
else
#endif
#ifndef CONFIG_UART2_DISABLE
if (irq = g_uart2priv.rcvirq)
{
dev = &g_uart2port;
}
else
#endif
{
PANIC(OSERR_INTERNAL);
}
/* Handle incoming, receive bytes (RDRF: Receive Data Register Full) */
uart_recvchars(dev);
return OK;
}
/****************************************************************************
* 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, unsigned int *status)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
uint16 rb;
/* Read the character from the readbuffer */
rb = up_serialin16(priv, M16C_UART_RB);
/* Return the received byte with the receive status */
*status = rb;
/* Return the received character (up to 9 bits) */
return (int)(rb & 0x01ff);
}
/****************************************************************************
* Name: m16c_rxint, up_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
static void m16c_rxint(struct up_dev_s *dev, boolean enable)
{
irqstate_t flags;
uint16 regaddr;
ubyte regvalue;
/* Disable interrupts to prevent asynchronous accesses */
flags = irqsave();
/* Pick the SxTIC register and enable interrupt priority */
#ifndef CONFIG_UART0_DISABLE
if (dev->uartno == 0)
{
regaddr = M16C_S0RIC;
regvalue = M16C_S0R_PRIO;
}
else
#endif
#ifndef CONFIG_UART1_DISABLE
if (dev->uartno == 1)
{
regaddr = M16C_S1RIC;
regvalue = M16C_S1R_PRIO;
}
else
#endif
#ifndef CONFIG_UART2_DISABLE
if (dev->uartno == 2)
{
regaddr = M16C_S2RIC;
regvalue = M16C_S2R_PRIO;
}
else
#endif
{
dbg("Invalid UART #\n");
return;
}
/* Are we enabling or disabling? */
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
putreg8(regvalue, regaddr);
#endif
dev->enables |= M16C_RXENABLED;
}
else
{
putreg8(0, regaddr);
dev->enables = ~M16C_RXENABLED;
}
asm ("\tnop\n\tnop\n\tnop"); /* Three NOPs -- probably not necessary here */
irqrestore(flags);
}
static void up_rxint(struct uart_dev_s *dev, boolean enable)
{
m16c_rxint((struct up_dev_s*)dev->priv, enable);
}
/****************************************************************************
* Name: up_rxavailable
*
* Description:
* Return TRUE if the RDR is not empty
*
****************************************************************************/
static boolean up_rxavailable(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
/* Return true if there is data available in the read buffer */
return ((up_serialin(priv, M16C_UART_C1) & UART_C1_RI) != 0);
}
/****************************************************************************
* Name: up_xmtvinterrupt
*
* Description:
* This is the UART receive 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
* up_dev_s structure in order to call these functions.
*
****************************************************************************/
static int up_xmtinterrupt(int irq, void *context)
{
struct uart_dev_s *dev = NULL;
#ifndef CONFIG_UART0_DISABLE
if (irq == g_uart0priv.xmtirq)
{
dev = &g_uart0port;
}
else
#endif
#ifndef CONFIG_UART1_DISABLE
if (irq == g_uart1priv.xmtirq)
{
dev = &g_uart1port;
}
else
#endif
#ifndef CONFIG_UART2_DISABLE
if (irq == g_uart2priv.xmtirq)
{
dev = &g_uart1port;
}
else
#endif
{
PANIC(OSERR_INTERNAL);
}
/* Handle outgoing, transmit bytes */
uart_xmitchars(dev);
return OK;
}
/****************************************************************************
* 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;
/* Write the data to the transmit buffer */
up_serialout16(priv, M16C_UART_TB, (uint16)ch);
}
/****************************************************************************
* Name: m16c_txint, up_txint
*
* Description:
* Call to enable or disable TX interrupts
*
****************************************************************************/
static void m16c_txint(struct up_dev_s *dev, boolean enable)
{
irqstate_t flags;
uint16 regaddr;
ubyte regvalue;
/* Disable interrupts to prevent asynchronous accesses */
flags = irqsave();
/* Pick the SxTIC register and enable interrupt priority */
#ifndef CONFIG_UART0_DISABLE
if (dev->uartno == 0)
{
regaddr = M16C_S0TIC;
regvalue = M16C_S0T_PRIO;
}
else
#endif
#ifndef CONFIG_UART1_DISABLE
if (dev->uartno == 1)
{
regaddr = M16C_S1TIC;
regvalue = M16C_S1T_PRIO;
}
else
#endif
#ifndef CONFIG_UART2_DISABLE
if (dev->uartno == 2)
{
regaddr = M16C_S2TIC;
regvalue = M16C_S2T_PRIO;
}
else
#endif
{
dbg("Invalid UART #\n");
return;
}
/* Are we enabling or disabling? */
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
putreg8(regvalue, regaddr);
#endif
dev->enables |= M16C_TXENABLED;
}
else
{
putreg8(0, regaddr);
dev->enables = ~M16C_TXENABLED;
}
asm ("\tnop\n\tnop\n\tnop"); /* Three NOPs -- probably not necessary here */
irqrestore(flags);
}
static void up_txint(struct uart_dev_s *dev, boolean enable)
{
m16c_txint((struct up_dev_s*)dev->priv, enable);
}
/****************************************************************************
* Name: up_txready
*
* Description:
* Return TRUE if the TDR is empty
*
****************************************************************************/
static boolean up_txready(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, M16C_UART_C1) & UART_C1_TI) != 0);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_earlyconsoleinit
*
* 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_consoleinit.
*
****************************************************************************/
void up_earlyconsoleinit(void)
{
/* NOTE: All GPIO configuration for the UARTs was performed in
* up_lowsetup
*/
/* Disable all UARTs */
#ifdef TTYS0_DEV
up_disableuartint(TTYS0_DEV.priv, NULL);
#ifdef TTYS1_DEV
up_disableuartint(TTYS1_DEV.priv, NULL);
#ifdef TTYS2_DEV
up_disableuartint(TTYS2_DEV.priv, NULL);
#endif
#endif
#endif
/* Configuration whichever one is the console */
#ifdef HAVE_SERIALCONSOLE
CONSOLE_DEV.isconsole = TRUE;
up_setup(&CONSOLE_DEV);
#endif
}
/****************************************************************************
* Name: up_consoleinit
*
* Description:
* Register serial console and serial ports. This assumes
* that up_earlyconsoleinit was called previously.
*
****************************************************************************/
void up_consoleinit(void)
{
/* Register the console */
#ifdef HAVE_SERIALCONSOLE
(void)uart_register("/dev/console", &CONSOLE_DEV);
#endif
/* Register all UARTs */
#ifdef TTYS0_DEV
(void)uart_register("/dev/ttyS0", &TTYS0_DEV);
#ifdef TTYS1_DEV
(void)uart_register("/dev/ttyS1", &TTYS1_DEV);
#ifdef TTYS2_DEV
(void)uart_register("/dev/ttyS2", &TTYS2_DEV);
#endif
#endif
#endif
}
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#ifdef HAVE_SERIALCONSOLE
struct up_dev_s *priv = (struct up_dev_s*)CONSOLE_DEV.priv;
ubyte ucon;
up_disableuartint(priv, &ucon);
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_waittxready(priv);
up_serialout16(priv, M16C_UART_TB, (uint16)'\r');
}
up_waittxready(priv);
up_serialout16(priv, M16C_UART_TB, (uint16)ch);
up_waittxready(priv);
up_restoreuartint(priv, ucon);
#endif
return ch;
}
#else /* CONFIG_USE_SERIALDRIVER */
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#ifdef HAVE_SERIALCONSOLE
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_lowputc('\r');
}
up_lowputc(ch);
#endif
return ch;
}
#endif /* CONFIG_USE_SERIALDRIVER */
#elif defined(CONFIG_UART0_SERIAL_CONSOLE) || defined(CONFIG_UART1_SERIAL_CONSOLE)|| defined(CONFIG_UART2_SERIAL_CONSOLE)
# error "A serial console selected, but corresponding UART not enabled"
#endif /* !CONFIG_UART0_DISABLE && !CONFIG_UART1_DISABLE && !CONFIG_UART2_DISABLE */
