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nuttx/arch/dm320/src/up_serial.c
patacongo cb77888f9a UART config is untested 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@578 42af7a65-404d-4744-a932-0658087f49c3
2008-01-28 22:32:40 +00:00

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/****************************************************************************
* up_serial.c
*
* Copyright (C) 2007, 2008 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 "dm320.h"
#include "os_internal.h"
#include "up_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
#define BASE_BAUD 115200
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
uint32 uartbase; /* Base address of UART registers */
uint32 baud; /* Configured baud */
uint16 msr; /* Saved MSR value */
ubyte irq; /* IRQ associated with this UART */
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_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 *status);
static void up_rxint(struct uart_dev_s *dev, boolean enable);
static boolean 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, boolean enable);
static boolean up_txready(struct uart_dev_s *dev);
static boolean 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 */
static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE];
static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE];
static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE];
static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE];
/* This describes the state of the DM320 uart0 port. */
static struct up_dev_s g_uart0priv =
{
.uartbase = DM320_UART0_REGISTER_BASE,
.baud = CONFIG_UART0_BAUD,
.irq = DM320_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,
};
/* This describes the state of the DM320 uart1 port. */
static struct up_dev_s g_uart1priv =
{
.uartbase = DM320_UART1_REGISTER_BASE,
.baud = CONFIG_UART1_BAUD,
.irq = DM320_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,
};
/* Now, which one with be tty0/console and which tty1? */
#ifdef CONFIG_SERIAL_IRDA_CONSOLE
# define CONSOLE_DEV g_uart1port
# define TTYS0_DEV g_uart1port
# define TTYS1_DEV g_uart0port
#else
# define CONSOLE_DEV g_uart0port
# define TTYS0_DEV g_uart0port
# define TTYS1_DEV g_uart1port
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialin
****************************************************************************/
static inline uint16 up_serialin(struct up_dev_s *priv, uint32 offset)
{
return getreg16(priv->uartbase + offset);
}
/****************************************************************************
* Name: up_serialout
****************************************************************************/
static inline void up_serialout(struct up_dev_s *priv, uint32 offset, uint16 value)
{
putreg16(value, priv->uartbase + offset);
}
/****************************************************************************
* Name: up_disableuartint
****************************************************************************/
static inline void up_disableuartint(struct up_dev_s *priv, uint16 *msr)
{
if (msr)
{
*msr = priv->msr & UART_MSR_ALLIE;
}
priv->msr &= ~UART_MSR_ALLIE;
up_serialout(priv, UART_MSR, priv->msr);
}
/****************************************************************************
* Name: up_restoreuartint
****************************************************************************/
static inline void up_restoreuartint(struct up_dev_s *priv, uint16 msr)
{
priv->msr |= msr & UART_MSR_ALLIE;
up_serialout(priv, UART_MSR, priv->msr);
}
/****************************************************************************
* Name: up_waittxready
****************************************************************************/
static inline void up_waittxready(struct up_dev_s *priv)
{
int tmp;
for (tmp = 1000 ; tmp > 0 ; tmp--)
{
if ((up_serialin(priv, UART_SR) & UART_SR_TFTI) != 0)
{
break;
}
}
}
/****************************************************************************
* Name: up_enablebreaks
****************************************************************************/
static inline void up_enablebreaks(struct up_dev_s *priv, boolean enable)
{
uint16 lcr = up_serialin(priv, UART_LCR);
if (enable)
{
lcr |= UART_LCR_BOC;
}
else
{
lcr &= ~UART_LCR_BOC;
}
up_serialout(priv, UART_LCR, lcr);
}
/****************************************************************************
* 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;
uint16 brsr;
/* Clear fifos */
up_serialout(priv, UART_RFCR, 0x8000);
up_serialout(priv, UART_TFCR, 0x8000);
/* Set rx and tx triggers */
up_serialout(priv, UART_RFCR, UART_RFCR_RTL_1);
up_serialout(priv, UART_TFCR, UART_TFCR_TTL_16);
/* Set up the MSR */
priv->msr = up_serialin(priv, UART_MSR);
if (priv->bits == 7)
{
priv->msr |= UART_DATABIT_7;
}
else
{
priv->msr &= ~UART_MSR_CLS;
}
if (priv->stopbits2)
{
priv->msr |= UART_STOPBIT_2;
}
else
{
priv->msr &= ~UART_MSR_SBLS;
}
if (priv->parity == 1)
{
priv->msr |= UART_ODDPARITY;
}
else if (priv->parity == 2)
{
priv->msr |= UART_EVENPARITY;
}
else
{
priv->msr &= ~(UART_MSR_PSB|UART_MSR_PEB);
}
/* Set up the BRSR */
switch (priv->baud)
{
case 2400:
brsr = UART_BAUD_2400;
break;
case 4800:
brsr = UART_BAUD_4800;
break;
default:
case 9600:
brsr = UART_BAUD_9600;
break;
case 14400:
brsr = UART_BAUD_14400;
break;
case 19200:
brsr = UART_BAUD_19200;
break;
case 28800:
brsr = UART_BAUD_28800;
break;
case 3840:
brsr = UART_BAUD_38400;
break;
case 57600:
brsr = UART_BAUD_57600;
break;
case 115200:
brsr = UART_BAUD_115200;
break;
case 230400:
brsr = UART_BAUD_230400;
break;
case 460800:
brsr = UART_BAUD_460800;
break;
case 921600:
brsr = UART_BAUD_921600;
break;
}
/* Setup the new UART configuration */
up_serialout(priv,UART_MSR, priv->msr);
up_serialout(priv, UART_BRSR, brsr);
up_enablebreaks(priv, FALSE);
#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 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;
uint16 status;
int passes = 0;
if (g_uart1priv.irq == irq)
{
dev = &g_uart1port;
}
else if (g_uart0priv.irq == irq)
{
dev = &g_uart0port;
}
else
{
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(;;)
{
/* Get the current UART status and check for loop
* termination conditions
*/
status = up_serialin(priv, UART_SR);
status &= (UART_SR_RFTI | UART_SR_TFTI);
if (status == 0 || passes > 256)
{
return OK;
}
/* Handline incoming, receive bytes */
if (status & UART_SR_RFTI)
{
uart_recvchars(dev);
}
/* Handle outgoing, transmit bytes */
if (status & UART_SR_TFTI)
{
uart_xmitchars(dev);
}
/* Keep track of how many times we do this in case there
* is some hardware failure condition.
*/
passes++;
}
}
/****************************************************************************
* 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)
{
*get_errno_ptr() = EINVAL;
ret = ERROR;
}
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;
default:
*get_errno_ptr() = ENOTTY;
ret = ERROR;
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 the return 'status'.
*
****************************************************************************/
static int up_receive(struct uart_dev_s *dev, uint32 *status)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
uint16 dtrr;
dtrr = up_serialin(priv, UART_DTRR);
*status = dtrr;
return dtrr & UART_DTRR_DTR_MASK;
}
/****************************************************************************
* Name: up_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
static void up_rxint(struct uart_dev_s *dev, boolean enable)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->msr |= UART_MSR_RFTIE;
#endif
}
else
{
priv->msr &= ~UART_MSR_RFTIE;
}
up_serialout(priv, UART_MSR, priv->msr);
}
/****************************************************************************
* Name: up_rxavailable
*
* Description:
* Return TRUE if the receive fifo is not empty
*
****************************************************************************/
static boolean up_rxavailable(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, UART_SR) & UART_SR_RFNEF) != 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, UART_DTRR, (uint16)ch);
}
/****************************************************************************
* Name: up_txint
*
* Description:
* Call to enable or disable TX interrupts
*
****************************************************************************/
static void up_txint(struct uart_dev_s *dev, boolean enable)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->msr |= UART_MSR_TFTIE;
#endif
}
else
{
priv->msr &= ~UART_MSR_TFTIE;
}
up_serialout(priv, UART_MSR, priv->msr);
}
/****************************************************************************
* Name: up_txready
*
* Description:
* Return TRUE if the tranmsit fifo is not full
*
****************************************************************************/
static boolean up_txready(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, UART_SR) & UART_SR_TFTI) != 0);
}
/****************************************************************************
* Name: up_txempty
*
* Description:
* Return TRUE if the transmit fifo is empty
*
****************************************************************************/
static boolean up_txempty(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, UART_SR) & UART_SR_TREF) == 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.
*
****************************************************************************/
void up_earlyserialinit(void)
{
up_disableuartint(TTYS0_DEV.priv, NULL);
up_disableuartint(TTYS1_DEV.priv, NULL);
CONSOLE_DEV.isconsole = TRUE;
up_setup(&CONSOLE_DEV);
}
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Register serial console and serial ports. This assumes
* that up_earlyserialinit was called previously.
*
****************************************************************************/
void up_serialinit(void)
{
(void)uart_register("/dev/console", &CONSOLE_DEV);
(void)uart_register("/dev/ttyS0", &TTYS0_DEV);
(void)uart_register("/dev/ttyS1", &TTYS1_DEV);
}
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug
* writes
*
****************************************************************************/
int up_putc(int ch)
{
struct up_dev_s *priv = (struct up_dev_s*)CONSOLE_DEV.priv;
uint16 ier;
up_disableuartint(priv, &ier);
up_waittxready(priv);
up_serialout(priv, UART_DTRR, (uint16)ch);
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_waittxready(priv);
up_serialout(priv, UART_DTRR, '\r');
}
up_waittxready(priv);
up_restoreuartint(priv, ier);
return ch;
}
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