drivers/serial/serial_s3c24x0.c - uboot/prism - Git at Google

 /*
  * (C) Copyright 2002
  * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  */

 #include <common.h>
 #if defined(CONFIG_S3C2400) || defined(CONFIG_TRAB)
 #include <s3c2400.h>
 #elif defined(CONFIG_S3C2410)
 #include <s3c2410.h>
 #endif

 DECLARE_GLOBAL_DATA_PTR;

 #ifdef CONFIG_SERIAL1
 #define UART_NR	S3C24X0_UART0

 #elif defined(CONFIG_SERIAL2)
 # if defined(CONFIG_TRAB)
 #  error "TRAB supports only CONFIG_SERIAL1"
 # endif
 #define UART_NR	S3C24X0_UART1

 #elif defined(CONFIG_SERIAL3)
 # if defined(CONFIG_TRAB)
 #  #error "TRAB supports only CONFIG_SERIAL1"
 # endif
 #define UART_NR	S3C24X0_UART2

 #else
 #error "Bad: you didn't configure serial ..."
 #endif

 #if defined(CONFIG_SERIAL_MULTI)
 #include <serial.h>

 /* Multi serial device functions */
 #define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
     int  s3serial##port##_init (void) {\
 	return serial_init_dev(port);}\
     void s3serial##port##_setbrg (void) {\
 	serial_setbrg_dev(port);}\
     int  s3serial##port##_getc (void) {\
 	return serial_getc_dev(port);}\
     int  s3serial##port##_tstc (void) {\
 	return serial_tstc_dev(port);}\
     void s3serial##port##_putc (const char c) {\
 	serial_putc_dev(port, c);}\
     void s3serial##port##_puts (const char *s) {\
 	serial_puts_dev(port, s);}

 #define INIT_S3C_SERIAL_STRUCTURE(port,name,bus) {\
 	name,\
 	bus,\
 	s3serial##port##_init,\
 	s3serial##port##_setbrg,\
 	s3serial##port##_getc,\
 	s3serial##port##_tstc,\
 	s3serial##port##_putc,\
 	s3serial##port##_puts, }

 #endif /* CONFIG_SERIAL_MULTI */

 void _serial_setbrg(const int dev_index)
 {
 	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
 	unsigned int reg = 0;
 	int i;

 	/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
 	reg = get_PCLK() / (16 * gd->baudrate) - 1;

 	uart->UBRDIV = reg;
 	for (i = 0; i < 100; i++);
 }
 #if defined(CONFIG_SERIAL_MULTI)
 static inline void
 serial_setbrg_dev(unsigned int dev_index)
 {
 	_serial_setbrg(dev_index);
 }
 #else
 void serial_setbrg(void)
 {
 	_serial_setbrg(UART_NR);
 }
 #endif


 /* Initialise the serial port. The settings are always 8 data bits, no parity,
  * 1 stop bit, no start bits.
  */
 static int serial_init_dev(const int dev_index)
 {
 	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);

 	/* FIFO enable, Tx/Rx FIFO clear */
 	uart->UFCON = 0x07;
 	uart->UMCON = 0x0;

 	/* Normal,No parity,1 stop,8 bit */
 	uart->ULCON = 0x3;
 	/*
 	 * tx=level,rx=edge,disable timeout int.,enable rx error int.,
 	 * normal,interrupt or polling
 	 */
 	uart->UCON = 0x245;

 #ifdef CONFIG_HWFLOW
 	uart->UMCON = 0x1; /* RTS up */
 #endif

 	/* FIXME: This is sooooooooooooooooooo ugly */
 #if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
 	/* we need auto hw flow control on the gsm and gps port */
 	if (dev_index == 0 || dev_index == 1)
 		uart->UMCON = 0x10;
 #endif
 	_serial_setbrg(dev_index);

 	return (0);
 }

 #if !defined(CONFIG_SERIAL_MULTI)
 /* Initialise the serial port. The settings are always 8 data bits, no parity,
  * 1 stop bit, no start bits.
  */
 int serial_init (void)
 {
 	return serial_init_dev(UART_NR);
 }
 #endif

 /*
  * Read a single byte from the serial port. Returns 1 on success, 0
  * otherwise. When the function is succesfull, the character read is
  * written into its argument c.
  */
 int _serial_getc (const int dev_index)
 {
 	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);

 	/* wait for character to arrive */
 	while (!(uart->UTRSTAT & 0x1));

 	return uart->URXH & 0xff;
 }
 #if defined(CONFIG_SERIAL_MULTI)
 static inline int serial_getc_dev(unsigned int dev_index)
 {
 	return _serial_getc(dev_index);
 }
 #else
 int serial_getc (void)
 {
 	return _serial_getc(UART_NR);
 }
 #endif

 #ifdef CONFIG_HWFLOW
 static int hwflow = 0; /* turned off by default */
 int hwflow_onoff(int on)
 {
 	switch(on) {
 	case 0:
 	default:
 		break; /* return current */
 	case 1:
 		hwflow = 1; /* turn on */
 		break;
 	case -1:
 		hwflow = 0; /* turn off */
 		break;
 	}
 	return hwflow;
 }
 #endif

 #ifdef CONFIG_MODEM_SUPPORT
 static int be_quiet = 0;
 void disable_putc(void)
 {
 	be_quiet = 1;
 }

 void enable_putc(void)
 {
 	be_quiet = 0;
 }
 #endif


 /*
  * Output a single byte to the serial port.
  */
 void _serial_putc (const char c, const int dev_index)
 {
 	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
 #ifdef CONFIG_MODEM_SUPPORT
 	if (be_quiet)
 		return;
 #endif

 	/* wait for room in the tx FIFO */
 	while (!(uart->UTRSTAT & 0x2));

 #ifdef CONFIG_HWFLOW
 	/* Wait for CTS up */
 	while(hwflow && !(uart->UMSTAT & 0x1))
 		;
 #endif

 	uart->UTXH = c;

 	/* If \n, also do \r */
 	if (c == '\n')
 		serial_putc ('\r');
 }
 #if defined(CONFIG_SERIAL_MULTI)
 static inline void serial_putc_dev(unsigned int dev_index, const char c)
 {
 	_serial_putc(c, dev_index);
 }
 #else
 void serial_putc(const char c)
 {
 	_serial_putc(c, UART_NR);
 }
 #endif


 /*
  * Test whether a character is in the RX buffer
  */
 int _serial_tstc(const int dev_index)
 {
 	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);

 	return uart->UTRSTAT & 0x1;
 }
 #if defined(CONFIG_SERIAL_MULTI)
 static inline int
 serial_tstc_dev(unsigned int dev_index)
 {
 	return _serial_tstc(dev_index);
 }
 #else
 int serial_tstc(void)
 {
 	return _serial_tstc(UART_NR);
 }
 #endif

 void _serial_puts(const char *s, const int dev_index)
 {
 	while (*s) {
 		_serial_putc (*s++, dev_index);
 	}
 }
 #if defined(CONFIG_SERIAL_MULTI)
 static inline void
 serial_puts_dev(int dev_index, const char *s)
 {
 	_serial_puts(s, dev_index);
 }
 #else
 void
 serial_puts (const char *s)
 {
 	_serial_puts(s, UART_NR);
 }
 #endif

 #if defined(CONFIG_SERIAL_MULTI)
 DECLARE_S3C_SERIAL_FUNCTIONS(0);
 struct serial_device s3c24xx_serial0_device =
 	INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0", "S3UART1");
 DECLARE_S3C_SERIAL_FUNCTIONS(1);
 struct serial_device s3c24xx_serial1_device =
 	INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1", "S3UART2");
 DECLARE_S3C_SERIAL_FUNCTIONS(2);
 struct serial_device s3c24xx_serial2_device =
 	INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2", "S3UART3");

 #endif /* CONFIG_SERIAL_MULTI */
	/*
	* (C) Copyright 2002
	* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*/

	#include <common.h>
	#if defined(CONFIG_S3C2400) \|\| defined(CONFIG_TRAB)
	#include <s3c2400.h>
	#elif defined(CONFIG_S3C2410)
	#include <s3c2410.h>
	#endif

	DECLARE_GLOBAL_DATA_PTR;

	#ifdef CONFIG_SERIAL1
	#define UART_NR S3C24X0_UART0

	#elif defined(CONFIG_SERIAL2)
	# if defined(CONFIG_TRAB)
	# error "TRAB supports only CONFIG_SERIAL1"
	# endif
	#define UART_NR S3C24X0_UART1

	#elif defined(CONFIG_SERIAL3)
	# if defined(CONFIG_TRAB)
	# #error "TRAB supports only CONFIG_SERIAL1"
	# endif
	#define UART_NR S3C24X0_UART2

	#else
	#error "Bad: you didn't configure serial ..."
	#endif

	#if defined(CONFIG_SERIAL_MULTI)
	#include <serial.h>

	/* Multi serial device functions */
	#define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
	int s3serial##port##_init (void) {\
	return serial_init_dev(port);}\
	void s3serial##port##_setbrg (void) {\
	serial_setbrg_dev(port);}\
	int s3serial##port##_getc (void) {\
	return serial_getc_dev(port);}\
	int s3serial##port##_tstc (void) {\
	return serial_tstc_dev(port);}\
	void s3serial##port##_putc (const char c) {\
	serial_putc_dev(port, c);}\
	void s3serial##port##_puts (const char *s) {\
	serial_puts_dev(port, s);}

	#define INIT_S3C_SERIAL_STRUCTURE(port,name,bus) {\
	name,\
	bus,\
	s3serial##port##_init,\
	s3serial##port##_setbrg,\
	s3serial##port##_getc,\
	s3serial##port##_tstc,\
	s3serial##port##_putc,\
	s3serial##port##_puts, }

	#endif /* CONFIG_SERIAL_MULTI */

	void _serial_setbrg(const int dev_index)
	{
	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
	unsigned int reg = 0;
	int i;

	/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
	reg = get_PCLK() / (16 * gd->baudrate) - 1;

	uart->UBRDIV = reg;
	for (i = 0; i < 100; i++);
	}
	#if defined(CONFIG_SERIAL_MULTI)
	static inline void
	serial_setbrg_dev(unsigned int dev_index)
	{
	_serial_setbrg(dev_index);
	}
	#else
	void serial_setbrg(void)
	{
	_serial_setbrg(UART_NR);
	}
	#endif


	/* Initialise the serial port. The settings are always 8 data bits, no parity,
	* 1 stop bit, no start bits.
	*/
	static int serial_init_dev(const int dev_index)
	{
	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);

	/* FIFO enable, Tx/Rx FIFO clear */
	uart->UFCON = 0x07;
	uart->UMCON = 0x0;

	/* Normal,No parity,1 stop,8 bit */
	uart->ULCON = 0x3;
	/*
	* tx=level,rx=edge,disable timeout int.,enable rx error int.,
	* normal,interrupt or polling
	*/
	uart->UCON = 0x245;

	#ifdef CONFIG_HWFLOW
	uart->UMCON = 0x1; /* RTS up */
	#endif

	/* FIXME: This is sooooooooooooooooooo ugly */
	#if defined(CONFIG_ARCH_GTA02_v1) \|\| defined(CONFIG_ARCH_GTA02_v2)
	/* we need auto hw flow control on the gsm and gps port */
	if (dev_index == 0 \|\| dev_index == 1)
	uart->UMCON = 0x10;
	#endif
	_serial_setbrg(dev_index);

	return (0);
	}

	#if !defined(CONFIG_SERIAL_MULTI)
	/* Initialise the serial port. The settings are always 8 data bits, no parity,
	* 1 stop bit, no start bits.
	*/
	int serial_init (void)
	{
	return serial_init_dev(UART_NR);
	}
	#endif

	/*
	* Read a single byte from the serial port. Returns 1 on success, 0
	* otherwise. When the function is succesfull, the character read is
	* written into its argument c.
	*/
	int _serial_getc (const int dev_index)
	{
	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);

	/* wait for character to arrive */
	while (!(uart->UTRSTAT & 0x1));

	return uart->URXH & 0xff;
	}
	#if defined(CONFIG_SERIAL_MULTI)
	static inline int serial_getc_dev(unsigned int dev_index)
	{
	return _serial_getc(dev_index);
	}
	#else
	int serial_getc (void)
	{
	return _serial_getc(UART_NR);
	}
	#endif

	#ifdef CONFIG_HWFLOW
	static int hwflow = 0; /* turned off by default */
	int hwflow_onoff(int on)
	{
	switch(on) {
	case 0:
	default:
	break; /* return current */
	case 1:
	hwflow = 1; /* turn on */
	break;
	case -1:
	hwflow = 0; /* turn off */
	break;
	}
	return hwflow;
	}
	#endif

	#ifdef CONFIG_MODEM_SUPPORT
	static int be_quiet = 0;
	void disable_putc(void)
	{
	be_quiet = 1;
	}

	void enable_putc(void)
	{
	be_quiet = 0;
	}
	#endif


	/*
	* Output a single byte to the serial port.
	*/
	void _serial_putc (const char c, const int dev_index)
	{
	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);
	#ifdef CONFIG_MODEM_SUPPORT
	if (be_quiet)
	return;
	#endif

	/* wait for room in the tx FIFO */
	while (!(uart->UTRSTAT & 0x2));

	#ifdef CONFIG_HWFLOW
	/* Wait for CTS up */
	while(hwflow && !(uart->UMSTAT & 0x1))
	;
	#endif

	uart->UTXH = c;

	/* If \n, also do \r */
	if (c == '\n')
	serial_putc ('\r');
	}
	#if defined(CONFIG_SERIAL_MULTI)
	static inline void serial_putc_dev(unsigned int dev_index, const char c)
	{
	_serial_putc(c, dev_index);
	}
	#else
	void serial_putc(const char c)
	{
	_serial_putc(c, UART_NR);
	}
	#endif


	/*
	* Test whether a character is in the RX buffer
	*/
	int _serial_tstc(const int dev_index)
	{
	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(dev_index);

	return uart->UTRSTAT & 0x1;
	}
	#if defined(CONFIG_SERIAL_MULTI)
	static inline int
	serial_tstc_dev(unsigned int dev_index)
	{
	return _serial_tstc(dev_index);
	}
	#else
	int serial_tstc(void)
	{
	return _serial_tstc(UART_NR);
	}
	#endif

	void _serial_puts(const char *s, const int dev_index)
	{
	while (*s) {
	_serial_putc (*s++, dev_index);
	}
	}
	#if defined(CONFIG_SERIAL_MULTI)
	static inline void
	serial_puts_dev(int dev_index, const char *s)
	{
	_serial_puts(s, dev_index);
	}
	#else
	void
	serial_puts (const char *s)
	{
	_serial_puts(s, UART_NR);
	}
	#endif

	#if defined(CONFIG_SERIAL_MULTI)
	DECLARE_S3C_SERIAL_FUNCTIONS(0);
	struct serial_device s3c24xx_serial0_device =
	INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0", "S3UART1");
	DECLARE_S3C_SERIAL_FUNCTIONS(1);
	struct serial_device s3c24xx_serial1_device =
	INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1", "S3UART2");
	DECLARE_S3C_SERIAL_FUNCTIONS(2);
	struct serial_device s3c24xx_serial2_device =
	INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2", "S3UART3");

	#endif /* CONFIG_SERIAL_MULTI */