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arch/arm/src/tiva: Add TERMIOS IOCTL support to the Tiva serial driver.

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This commit is contained in:
Dmitry Sharihin
2018-04-28 11:10:42 -06:00
committed by Gregory Nutt
parent 7e756e413d
commit 51b78034ac
1 changed files with 147 additions and 25 deletions
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arch/arm/src/tiva/tiva_serial.c
+147 -25
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@@ -1,7 +1,8 @@
/****************************************************************************
* arch/arm/src/tiva/tiva_serial.c
*
* Copyright (C) 2009-2010, 2012-2014, 2017 Gregory Nutt. All rights reserved.
* Copyright (C) 2009-2010, 2012-2014, 2017-2018 Gregory Nutt. All rights
* reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -711,25 +712,23 @@ static inline void up_waittxnotfull(struct up_dev_s *priv)
#endif
/****************************************************************************
* Name: up_setup
* Name: up_set_format
*
* Description:
* Configure the UART baud, bits, parity, fifos, etc. This
* method is called the first time that the serial port is
* opened.
* Configure the UART baud, bits, parity, fifos, etc.
*
****************************************************************************/
static int up_setup(struct uart_dev_s *dev)
static void up_set_format(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;
uint32_t lcrh;
uint32_t ctl;
bool was_active;
/* Note: The logic here depends on the fact that that the UART module
* was enabled and the GPIOs were configured in up_lowsetup().
@@ -738,8 +737,13 @@ static int up_setup(struct uart_dev_s *dev)
/* 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);
was_active = (ctl & UART_CTL_UARTEN) != 0;
if (was_active)
{
ctl &= ~UART_CTL_UARTEN;
up_serialout(priv, TIVA_UART_CTL_OFFSET, ctl);
}
/* Calculate BAUD rate from the SYS clock:
*
@@ -792,31 +796,34 @@ static int up_setup(struct uart_dev_s *dev)
switch (priv->bits)
{
case 5:
lcrh |= UART_LCRH_WLEN_5BITS;
break;
lcrh |= UART_LCRH_WLEN_5BITS;
break;
case 6:
lcrh |= UART_LCRH_WLEN_6BITS;
break;
lcrh |= UART_LCRH_WLEN_6BITS;
break;
case 7:
lcrh |= UART_LCRH_WLEN_7BITS;
break;
lcrh |= UART_LCRH_WLEN_7BITS;
break;
case 8:
default:
lcrh |= UART_LCRH_WLEN_8BITS;
break;
lcrh |= UART_LCRH_WLEN_8BITS;
break;
}
switch (priv->parity)
{
case 0:
default:
break;
break;
case 1:
lcrh |= UART_LCRH_PEN;
break;
lcrh |= UART_LCRH_PEN;
break;
case 2:
lcrh |= UART_LCRH_PEN | UART_LCRH_EPS;
break;
lcrh |= UART_LCRH_PEN | UART_LCRH_EPS;
break;
}
if (priv->stopbits2)
@@ -825,6 +832,33 @@ static int up_setup(struct uart_dev_s *dev)
}
up_serialout(priv, TIVA_UART_LCRH_OFFSET, lcrh);
if (was_active)
{
ctl = up_serialin(priv, TIVA_UART_CTL_OFFSET);
ctl |= UART_CTL_UARTEN;
up_serialout(priv, TIVA_UART_CTL_OFFSET, ctl);
}
}
/****************************************************************************
* 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 = 0;
uint32_t ctl = 0;
#ifndef CONFIG_SUPPRESS_UART_CONFIG
up_set_format(dev);
#endif
/* Set the UART to interrupt whenever the TX FIFO is almost empty or when
@@ -1005,9 +1039,12 @@ static int up_interrupt(int irq, void *context, void *arg)
static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
{
#ifdef CONFIG_SERIAL_TIOCSERGSTRUCT
#if defined(CONFIG_SERIAL_TIOCSERGSTRUCT) || defined(CONFIG_SERIAL_TERMIOS)
struct inode *inode = filep->f_inode;
struct uart_dev_s *dev = inode->i_private;
#endif
#if defined(CONFIG_SERIAL_TERMIOS)
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
#endif
int ret = OK;
@@ -1029,6 +1066,91 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
break;
#endif
#ifdef CONFIG_SERIAL_TERMIOS
case TCGETS:
{
struct termios *termiosp = (struct termios *)arg;
tcflag_t ccflag = 0;
if (!termiosp)
{
ret = -EINVAL;
break;
}
cfsetispeed(termiosp, priv->baud);
if (priv->bits >= 5 && priv->bits <= 8)
{
ccflag |= (CS5 + (priv->bits - 5));
}
if (priv->stopbits2)
{
ccflag |= CSTOPB;
}
if (priv->parity == 1)
{
ccflag |= PARENB;
}
else if (priv->parity == 2)
{
ccflag |= PARENB | PARODD;
}
/* TODO append support for HUPCL, CLOCAL and flow control bits
* as well as os-compliant break sequence
*/
termiosp->c_cflag = ccflag;
}
break;
case TCSETS:
{
struct termios *termiosp = (struct termios *)arg;
if (!termiosp)
{
ret = -EINVAL;
break;
}
/* Perform some sanity checks before accepting any changes */
if (termiosp->c_cflag & CRTSCTS)
{
/* We don't support for flow control right now, so we report an
* error
*/
ret = -EINVAL;
break;
}
if (termiosp->c_cflag & PARENB)
{
priv->parity = (termiosp->c_cflag & PARODD) ? 1 : 2;
}
else
{
priv->parity = 0;
}
priv->stopbits2 = (termiosp->c_cflag & CSTOPB) != 0;
priv->bits = (termiosp->c_cflag & CSIZE) + 5;
priv->baud = cfgetispeed(termiosp);
/* Effect the changes immediately - note that we do not implement
* TCSADRAIN / TCSAFLUSH
*/
up_set_format(dev);
}
break;
#endif /* CONFIG_SERIAL_TERMIOS */
default:
ret = -ENOTTY;
break;