board/trab/trab.c - platform/external/u-boot - Gitiles

 /*
  * (C) Copyright 2002
  * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * 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
  */

 /* #define DEBUG */

 #include <common.h>
 #include <malloc.h>
 #include <s3c2400.h>
 #include <command.h>

 /* ------------------------------------------------------------------------- */

 #ifdef CFG_BRIGHTNESS
 static void spi_init(void);
 static void wait_transmit_done(void);
 static void tsc2000_write(unsigned int page, unsigned int reg,
 						  unsigned int data);
 static void tsc2000_set_brightness(void);
 #endif
 #ifdef CONFIG_MODEM_SUPPORT
 static int key_pressed(void);
 extern void disable_putc(void);
 extern int do_mdm_init; /* defined in common/main.c */

 /*
  * We need a delay of at least 500 us after turning on the VFD clock
  * before we can read any useful information for the CPLD controlling
  * the keyboard switches. Let's play safe and wait 5 ms. The problem
  * is that timers are not available yet, so we use a manually timed
  * loop.
  */
 #define KBD_MDELAY	5000
 static void udelay_no_timer (int usec)
 {
 	DECLARE_GLOBAL_DATA_PTR;

 	int i;
 	int delay = usec * 3;

 	for (i = 0; i < delay; i ++) gd->bd->bi_arch_number = MACH_TYPE_TRAB;
 }
 #endif /* CONFIG_MODEM_SUPPORT */

 /*
  * Miscellaneous platform dependent initialisations
  */

 int board_init ()
 {
 #if defined(CONFIG_VFD)
 	extern int vfd_init_clocks(void);
 #endif
 	DECLARE_GLOBAL_DATA_PTR;
 	S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
 	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();

 	/* memory and cpu-speed are setup before relocation */
 #ifdef CONFIG_TRAB_50MHZ
 	/* change the clock to be 50 MHz 1:1:1 */
 	/* MDIV:0x5c PDIV:4 SDIV:2 */
 	clk_power->MPLLCON = 0x5c042;
 	clk_power->CLKDIVN = 0;
 #else
 	/* change the clock to be 133 MHz 1:2:4 */
 	/* MDIV:0x7d PDIV:4 SDIV:1 */
 	clk_power->MPLLCON = 0x7d041;
 	clk_power->CLKDIVN = 3;
 #endif

 	/* set up the I/O ports */
 	gpio->PACON = 0x3ffff;
 	gpio->PBCON = 0xaaaaaaaa;
 	gpio->PBUP  = 0xffff;
 	/* INPUT nCTS0 nRTS0 TXD[1] TXD[0] RXD[1] RXD[0]	*/
 	/*  00,    10,      10,      10,      10,      10,      10 	*/
 	gpio->PFCON = (2<<0) | (2<<2) | (2<<4) | (2<<6) | (2<<8) | (2<<10);
 #ifdef CONFIG_HWFLOW
 	/* do not pull up RXD0, RXD1, TXD0, TXD1, CTS0, RTS0 */
 	gpio->PFUP  = (1<<0) | (1<<1) | (1<<2) | (1<<3) | (1<<4) | (1<<5);
 #else
 	/* do not pull up RXD0, RXD1, TXD0, TXD1 */
 	gpio->PFUP  = (1<<0) | (1<<1) | (1<<2) | (1<<3);
 #endif
 	gpio->PGCON = 0x0;
 	gpio->PGUP  = 0x0;
 	gpio->OPENCR= 0x0;

 	/* suppress flicker of the VFDs */
 	gpio->MISCCR = 0x40;
 	gpio->PFCON |= (2<<12);

 	gd->bd->bi_arch_number = MACH_TYPE_TRAB;

 	/* adress of boot parameters */
 	gd->bd->bi_boot_params = 0x0c000100;

 	/* Make sure both buzzers are turned off */
 	gpio->PDCON |= 0x5400;
 	gpio->PDDAT &= ~0xE0;

 #ifdef CONFIG_VFD
 	vfd_init_clocks();
 #endif /* CONFIG_VFD */

 #ifdef CONFIG_MODEM_SUPPORT
 	udelay_no_timer (KBD_MDELAY);

 	if (key_pressed()) {
 		disable_putc();	/* modem doesn't understand banner etc */
 		do_mdm_init = 1;
 	}
 #endif	/* CONFIG_MODEM_SUPPORT */

 #ifdef CONFIG_DRIVER_S3C24X0_I2C
 	/* Configure I/O ports PG5 und PG6 for I2C */
  	gpio->PGCON = (gpio->PGCON & 0x003c00) | 0x003c00;
 #endif /* CONFIG_DRIVER_S3C24X0_I2C */

 	return 0;
 }

 int dram_init (void)
 {
 	DECLARE_GLOBAL_DATA_PTR;

 	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
 	gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
 	return 0;
 }

 /*-----------------------------------------------------------------------
  * Keyboard Controller
  */

 /* Maximum key number */
 #define KEYBD_KEY_NUM		4

 #define KBD_DATA	(((*(volatile ulong *)0x04020000) >> 16) & 0xF)

 static uchar *key_match (ulong);

 int misc_init_r (void)
 {
 	ulong kbd_data = KBD_DATA;
 	uchar keybd_env[KEYBD_KEY_NUM + 1];
 	uchar *str;
 	int i;

 #ifdef CONFIG_AUTO_UPDATE
 	extern int do_auto_update(void);
 	/* this has priority over all else */
 	do_auto_update();
 #endif

 	for (i = 0; i < KEYBD_KEY_NUM; ++i) {
 		keybd_env[i] = '0' + ((kbd_data >> i) & 1);
 	}
 	keybd_env[i] = '\0';
 	debug ("** Setting keybd=\"%s\"\n", keybd_env);
 	setenv ("keybd", keybd_env);

 	str = strdup (key_match (kbd_data));	/* decode keys */

 #ifdef CONFIG_PREBOOT	/* automatically configure "preboot" command on key match */
 	debug ("** Setting preboot=\"%s\"\n", str);
 	setenv ("preboot", str);	/* set or delete definition */
 #endif /* CONFIG_PREBOOT */
 	if (str != NULL) {
 		free (str);
 	}

 #ifdef CFG_BRIGHTNESS
 	tsc2000_set_brightness();
 #endif
 	return (0);
 }

 #ifdef CONFIG_PREBOOT

 static uchar kbd_magic_prefix[] = "key_magic";
 static uchar kbd_command_prefix[] = "key_cmd";

 static int compare_magic (ulong kbd_data, uchar *str)
 {
 	uchar key_mask;

 	debug ("compare_magic: kbd: %04lx  str: \"%s\"\n",kbd_data,str);
 	for (; *str; str++)
 	{
 		uchar c = *str - '1';

 		if (c >= KEYBD_KEY_NUM)		/* bad key number */
 			return -1;

 		key_mask = 1 << c;

 		if (!(kbd_data & key_mask)) {	/* key not pressed */
 			debug ( "compare_magic: "
 				"kbd: %04lx mask: %04lx - key not pressed\n",
 				kbd_data, key_mask );
 			return -1;
 		}

 		kbd_data &= ~key_mask;
 	}

 	if (kbd_data) {				/* key(s) not released */
 		debug ( "compare_magic: "
 			"kbd: %04lx - key(s) not released\n", kbd_data);
 		return -1;
 	}

 	return 0;
 }

 /*-----------------------------------------------------------------------
  * Check if pressed key(s) match magic sequence,
  * and return the command string associated with that key(s).
  *
  * If no key press was decoded, NULL is returned.
  *
  * Note: the first character of the argument will be overwritten with
  * the "magic charcter code" of the decoded key(s), or '\0'.
  *
  *
  * Note: the string points to static environment data and must be
  * saved before you call any function that modifies the environment.
  */
 static uchar *key_match (ulong kbd_data)
 {
 	uchar magic[sizeof (kbd_magic_prefix) + 1];
 	uchar cmd_name[sizeof (kbd_command_prefix) + 1];
 	uchar *suffix;
 	uchar *kbd_magic_keys;

 	/*
 	 * The following string defines the characters that can pe appended
 	 * to "key_magic" to form the names of environment variables that
 	 * hold "magic" key codes, i. e. such key codes that can cause
 	 * pre-boot actions. If the string is empty (""), then only
 	 * "key_magic" is checked (old behaviour); the string "125" causes
 	 * checks for "key_magic1", "key_magic2" and "key_magic5", etc.
 	 */
 	if ((kbd_magic_keys = getenv ("magic_keys")) == NULL)
 		kbd_magic_keys = "";

 	debug ("key_match: magic_keys=\"%s\"\n", kbd_magic_keys);

 	/* loop over all magic keys;
 	 * use '\0' suffix in case of empty string
 	 */
 	for (suffix=kbd_magic_keys; *suffix || suffix==kbd_magic_keys; ++suffix)
 	{
 		sprintf (magic, "%s%c", kbd_magic_prefix, *suffix);

 		debug ("key_match: magic=\"%s\"\n",
 			getenv(magic) ? getenv(magic) : "<UNDEFINED>");

 		if (compare_magic(kbd_data, getenv(magic)) == 0)
 		{
 			sprintf (cmd_name, "%s%c", kbd_command_prefix, *suffix);
 			debug ("key_match: cmdname %s=\"%s\"\n",
 				cmd_name,
 				getenv (cmd_name) ?
 					getenv (cmd_name) :
 					"<UNDEFINED>");
 			return (getenv (cmd_name));
 		}
 	}
 	debug ("key_match: no match\n");
 	return (NULL);
 }
 #endif							/* CONFIG_PREBOOT */

 /* Read Keyboard status */
 int do_kbd (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 {
 	ulong kbd_data = KBD_DATA;
 	uchar keybd_env[KEYBD_KEY_NUM + 1];
 	int i;

 	puts ("Keys:");
 	for (i = 0; i < KEYBD_KEY_NUM; ++i) {
 		keybd_env[i] = '0' + ((kbd_data >> i) & 1);
 		printf (" %c", keybd_env[i]);
 	}
 	keybd_env[i] = '\0';
 	putc ('\n');
 	setenv ("keybd", keybd_env);
 	return 0;
 }

 U_BOOT_CMD(
  	kbd,	1,	1,	do_kbd,
  	"kbd     - read keyboard status\n",
  	NULL
 );

 #ifdef CONFIG_MODEM_SUPPORT
 static int key_pressed(void)
 {
 	return (compare_magic(KBD_DATA, CONFIG_MODEM_KEY_MAGIC) == 0);
 }
 #endif	/* CONFIG_MODEM_SUPPORT */

 #ifdef CFG_BRIGHTNESS

 static inline void SET_CS_TOUCH(void)
 {
 	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();

 	gpio->PDDAT &= 0x5FF;
 }

 static inline void CLR_CS_TOUCH(void)
 {
 	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();

 	gpio->PDDAT |= 0x200;
 }

 static void spi_init(void)
 {
 	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
 	S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
 	int i;

 	/* Configure I/O ports. */
  	gpio->PDCON = (gpio->PDCON & 0xF3FFFF) | 0x040000;
 	gpio->PGCON = (gpio->PGCON & 0x0F3FFF) | 0x008000;
 	gpio->PGCON = (gpio->PGCON & 0x0CFFFF) | 0x020000;
 	gpio->PGCON = (gpio->PGCON & 0x03FFFF) | 0x080000;

 	CLR_CS_TOUCH();

 	spi->ch[0].SPPRE = 0x1F; /* Baudrate ca. 514kHz */
 	spi->ch[0].SPPIN = 0x01;  /* SPI-MOSI holds Level after last bit */
 	spi->ch[0].SPCON = 0x1A;  /* Polling, Prescaler, Master, CPOL=0, CPHA=1 */

 	/* Dummy byte ensures clock to be low. */
 	for (i = 0; i < 10; i++) {
 		spi->ch[0].SPTDAT = 0xFF;
 	}
 	wait_transmit_done();
 }

 static void wait_transmit_done(void)
 {
 	S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();

 	while (!(spi->ch[0].SPSTA & 0x01)); /* wait until transfer is done */
 }

 static void tsc2000_write(unsigned int page, unsigned int reg,
 						  unsigned int data)
 {
 	S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
 	unsigned int command;

 	SET_CS_TOUCH();
 	command = 0x0000;
 	command |= (page << 11);
 	command |= (reg << 5);

 	spi->ch[0].SPTDAT = (command & 0xFF00) >> 8;
 	wait_transmit_done();
 	spi->ch[0].SPTDAT = (command & 0x00FF);
 	wait_transmit_done();
 	spi->ch[0].SPTDAT = (data & 0xFF00) >> 8;
 	wait_transmit_done();
 	spi->ch[0].SPTDAT = (data & 0x00FF);
 	wait_transmit_done();

 	CLR_CS_TOUCH();
 }

 static void tsc2000_set_brightness(void)
 {
 	uchar tmp[10];
 	int i, br;

 	spi_init();
 	tsc2000_write(1, 2, 0x0); /* Power up DAC */

 	i = getenv_r("brightness", tmp, sizeof(tmp));
 	br = (i > 0)
 		? (int) simple_strtoul (tmp, NULL, 10)
 		: CFG_BRIGHTNESS;

 	tsc2000_write(0, 0xb, br & 0xff);
 }
 #endif
	/*
	* (C) Copyright 2002
	* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
	*
	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* 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
	*/

	/* #define DEBUG */

	#include <common.h>
	#include <malloc.h>
	#include <s3c2400.h>
	#include <command.h>

	/* ------------------------------------------------------------------------- */

	#ifdef CFG_BRIGHTNESS
	static void spi_init(void);
	static void wait_transmit_done(void);
	static void tsc2000_write(unsigned int page, unsigned int reg,
	unsigned int data);
	static void tsc2000_set_brightness(void);
	#endif
	#ifdef CONFIG_MODEM_SUPPORT
	static int key_pressed(void);
	extern void disable_putc(void);
	extern int do_mdm_init; /* defined in common/main.c */

	/*
	* We need a delay of at least 500 us after turning on the VFD clock
	* before we can read any useful information for the CPLD controlling
	* the keyboard switches. Let's play safe and wait 5 ms. The problem
	* is that timers are not available yet, so we use a manually timed
	* loop.
	*/
	#define KBD_MDELAY 5000
	static void udelay_no_timer (int usec)
	{
	DECLARE_GLOBAL_DATA_PTR;

	int i;
	int delay = usec * 3;

	for (i = 0; i < delay; i ++) gd->bd->bi_arch_number = MACH_TYPE_TRAB;
	}
	#endif /* CONFIG_MODEM_SUPPORT */

	/*
	* Miscellaneous platform dependent initialisations
	*/

	int board_init ()
	{
	#if defined(CONFIG_VFD)
	extern int vfd_init_clocks(void);
	#endif
	DECLARE_GLOBAL_DATA_PTR;
	S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();

	/* memory and cpu-speed are setup before relocation */
	#ifdef CONFIG_TRAB_50MHZ
	/* change the clock to be 50 MHz 1:1:1 */
	/* MDIV:0x5c PDIV:4 SDIV:2 */
	clk_power->MPLLCON = 0x5c042;
	clk_power->CLKDIVN = 0;
	#else
	/* change the clock to be 133 MHz 1:2:4 */
	/* MDIV:0x7d PDIV:4 SDIV:1 */
	clk_power->MPLLCON = 0x7d041;
	clk_power->CLKDIVN = 3;
	#endif

	/* set up the I/O ports */
	gpio->PACON = 0x3ffff;
	gpio->PBCON = 0xaaaaaaaa;
	gpio->PBUP = 0xffff;
	/* INPUT nCTS0 nRTS0 TXD[1] TXD[0] RXD[1] RXD[0] */
	/* 00, 10, 10, 10, 10, 10, 10 */
	gpio->PFCON = (2<<0) \| (2<<2) \| (2<<4) \| (2<<6) \| (2<<8) \| (2<<10);
	#ifdef CONFIG_HWFLOW
	/* do not pull up RXD0, RXD1, TXD0, TXD1, CTS0, RTS0 */
	gpio->PFUP = (1<<0) \| (1<<1) \| (1<<2) \| (1<<3) \| (1<<4) \| (1<<5);
	#else
	/* do not pull up RXD0, RXD1, TXD0, TXD1 */
	gpio->PFUP = (1<<0) \| (1<<1) \| (1<<2) \| (1<<3);
	#endif
	gpio->PGCON = 0x0;
	gpio->PGUP = 0x0;
	gpio->OPENCR= 0x0;

	/* suppress flicker of the VFDs */
	gpio->MISCCR = 0x40;
	gpio->PFCON \|= (2<<12);

	gd->bd->bi_arch_number = MACH_TYPE_TRAB;

	/* adress of boot parameters */
	gd->bd->bi_boot_params = 0x0c000100;

	/* Make sure both buzzers are turned off */
	gpio->PDCON \|= 0x5400;
	gpio->PDDAT &= ~0xE0;

	#ifdef CONFIG_VFD
	vfd_init_clocks();
	#endif /* CONFIG_VFD */

	#ifdef CONFIG_MODEM_SUPPORT
	udelay_no_timer (KBD_MDELAY);

	if (key_pressed()) {
	disable_putc(); /* modem doesn't understand banner etc */
	do_mdm_init = 1;
	}
	#endif /* CONFIG_MODEM_SUPPORT */

	#ifdef CONFIG_DRIVER_S3C24X0_I2C
	/* Configure I/O ports PG5 und PG6 for I2C */
	gpio->PGCON = (gpio->PGCON & 0x003c00) \| 0x003c00;
	#endif /* CONFIG_DRIVER_S3C24X0_I2C */

	return 0;
	}

	int dram_init (void)
	{
	DECLARE_GLOBAL_DATA_PTR;

	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
	gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
	return 0;
	}

	/*-----------------------------------------------------------------------
	* Keyboard Controller
	*/

	/* Maximum key number */
	#define KEYBD_KEY_NUM 4

	#define KBD_DATA ((((volatile ulong )0x04020000) >> 16) & 0xF)

	static uchar *key_match (ulong);

	int misc_init_r (void)
	{
	ulong kbd_data = KBD_DATA;
	uchar keybd_env[KEYBD_KEY_NUM + 1];
	uchar *str;
	int i;

	#ifdef CONFIG_AUTO_UPDATE
	extern int do_auto_update(void);
	/* this has priority over all else */
	do_auto_update();
	#endif

	for (i = 0; i < KEYBD_KEY_NUM; ++i) {
	keybd_env[i] = '0' + ((kbd_data >> i) & 1);
	}
	keybd_env[i] = '\0';
	debug ("** Setting keybd=\"%s\"\n", keybd_env);
	setenv ("keybd", keybd_env);

	str = strdup (key_match (kbd_data)); /* decode keys */

	#ifdef CONFIG_PREBOOT /* automatically configure "preboot" command on key match */
	debug ("** Setting preboot=\"%s\"\n", str);
	setenv ("preboot", str); /* set or delete definition */
	#endif /* CONFIG_PREBOOT */
	if (str != NULL) {
	free (str);
	}

	#ifdef CFG_BRIGHTNESS
	tsc2000_set_brightness();
	#endif
	return (0);
	}

	#ifdef CONFIG_PREBOOT

	static uchar kbd_magic_prefix[] = "key_magic";
	static uchar kbd_command_prefix[] = "key_cmd";

	static int compare_magic (ulong kbd_data, uchar *str)
	{
	uchar key_mask;

	debug ("compare_magic: kbd: %04lx str: \"%s\"\n",kbd_data,str);
	for (; *str; str++)
	{
	uchar c = *str - '1';

	if (c >= KEYBD_KEY_NUM) /* bad key number */
	return -1;

	key_mask = 1 << c;

	if (!(kbd_data & key_mask)) { /* key not pressed */
	debug ( "compare_magic: "
	"kbd: %04lx mask: %04lx - key not pressed\n",
	kbd_data, key_mask );
	return -1;
	}

	kbd_data &= ~key_mask;
	}

	if (kbd_data) { /* key(s) not released */
	debug ( "compare_magic: "
	"kbd: %04lx - key(s) not released\n", kbd_data);
	return -1;
	}

	return 0;
	}

	/*-----------------------------------------------------------------------
	* Check if pressed key(s) match magic sequence,
	* and return the command string associated with that key(s).
	*
	* If no key press was decoded, NULL is returned.
	*
	* Note: the first character of the argument will be overwritten with
	* the "magic charcter code" of the decoded key(s), or '\0'.
	*
	*
	* Note: the string points to static environment data and must be
	* saved before you call any function that modifies the environment.
	*/
	static uchar *key_match (ulong kbd_data)
	{
	uchar magic[sizeof (kbd_magic_prefix) + 1];
	uchar cmd_name[sizeof (kbd_command_prefix) + 1];
	uchar *suffix;
	uchar *kbd_magic_keys;

	/*
	* The following string defines the characters that can pe appended
	* to "key_magic" to form the names of environment variables that
	* hold "magic" key codes, i. e. such key codes that can cause
	* pre-boot actions. If the string is empty (""), then only
	* "key_magic" is checked (old behaviour); the string "125" causes
	* checks for "key_magic1", "key_magic2" and "key_magic5", etc.
	*/
	if ((kbd_magic_keys = getenv ("magic_keys")) == NULL)
	kbd_magic_keys = "";

	debug ("key_match: magic_keys=\"%s\"\n", kbd_magic_keys);

	/* loop over all magic keys;
	* use '\0' suffix in case of empty string
	*/
	for (suffix=kbd_magic_keys; *suffix \|\| suffix==kbd_magic_keys; ++suffix)
	{
	sprintf (magic, "%s%c", kbd_magic_prefix, *suffix);

	debug ("key_match: magic=\"%s\"\n",
	getenv(magic) ? getenv(magic) : "<UNDEFINED>");

	if (compare_magic(kbd_data, getenv(magic)) == 0)
	{
	sprintf (cmd_name, "%s%c", kbd_command_prefix, *suffix);
	debug ("key_match: cmdname %s=\"%s\"\n",
	cmd_name,
	getenv (cmd_name) ?
	getenv (cmd_name) :
	"<UNDEFINED>");
	return (getenv (cmd_name));
	}
	}
	debug ("key_match: no match\n");
	return (NULL);
	}
	#endif /* CONFIG_PREBOOT */

	/* Read Keyboard status */
	int do_kbd (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
	{
	ulong kbd_data = KBD_DATA;
	uchar keybd_env[KEYBD_KEY_NUM + 1];
	int i;

	puts ("Keys:");
	for (i = 0; i < KEYBD_KEY_NUM; ++i) {
	keybd_env[i] = '0' + ((kbd_data >> i) & 1);
	printf (" %c", keybd_env[i]);
	}
	keybd_env[i] = '\0';
	putc ('\n');
	setenv ("keybd", keybd_env);
	return 0;
	}

	U_BOOT_CMD(
	kbd, 1, 1, do_kbd,
	"kbd - read keyboard status\n",
	NULL
	);

	#ifdef CONFIG_MODEM_SUPPORT
	static int key_pressed(void)
	{
	return (compare_magic(KBD_DATA, CONFIG_MODEM_KEY_MAGIC) == 0);
	}
	#endif /* CONFIG_MODEM_SUPPORT */

	#ifdef CFG_BRIGHTNESS

	static inline void SET_CS_TOUCH(void)
	{
	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();

	gpio->PDDAT &= 0x5FF;
	}

	static inline void CLR_CS_TOUCH(void)
	{
	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();

	gpio->PDDAT \|= 0x200;
	}

	static void spi_init(void)
	{
	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
	S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
	int i;

	/* Configure I/O ports. */
	gpio->PDCON = (gpio->PDCON & 0xF3FFFF) \| 0x040000;
	gpio->PGCON = (gpio->PGCON & 0x0F3FFF) \| 0x008000;
	gpio->PGCON = (gpio->PGCON & 0x0CFFFF) \| 0x020000;
	gpio->PGCON = (gpio->PGCON & 0x03FFFF) \| 0x080000;

	CLR_CS_TOUCH();

	spi->ch[0].SPPRE = 0x1F; /* Baudrate ca. 514kHz */
	spi->ch[0].SPPIN = 0x01; /* SPI-MOSI holds Level after last bit */
	spi->ch[0].SPCON = 0x1A; /* Polling, Prescaler, Master, CPOL=0, CPHA=1 */

	/* Dummy byte ensures clock to be low. */
	for (i = 0; i < 10; i++) {
	spi->ch[0].SPTDAT = 0xFF;
	}
	wait_transmit_done();
	}

	static void wait_transmit_done(void)
	{
	S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();

	while (!(spi->ch[0].SPSTA & 0x01)); /* wait until transfer is done */
	}

	static void tsc2000_write(unsigned int page, unsigned int reg,
	unsigned int data)
	{
	S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
	unsigned int command;

	SET_CS_TOUCH();
	command = 0x0000;
	command \|= (page << 11);
	command \|= (reg << 5);

	spi->ch[0].SPTDAT = (command & 0xFF00) >> 8;
	wait_transmit_done();
	spi->ch[0].SPTDAT = (command & 0x00FF);
	wait_transmit_done();
	spi->ch[0].SPTDAT = (data & 0xFF00) >> 8;
	wait_transmit_done();
	spi->ch[0].SPTDAT = (data & 0x00FF);
	wait_transmit_done();

	CLR_CS_TOUCH();
	}

	static void tsc2000_set_brightness(void)
	{
	uchar tmp[10];
	int i, br;

	spi_init();
	tsc2000_write(1, 2, 0x0); /* Power up DAC */

	i = getenv_r("brightness", tmp, sizeof(tmp));
	br = (i > 0)
	? (int) simple_strtoul (tmp, NULL, 10)
	: CFG_BRIGHTNESS;

	tsc2000_write(0, 0xb, br & 0xff);
	}
	#endif