lwmon.c

AT91RM9200的完整启动代码：包括loader, boot及U-boot三部分均已编译通过！欢迎下载使用！

	}
	/* Reset error code and verify */
	val = KEYBD_CMD_RESET_ERRORS;
	i2c_write (kbd_addr, 0, 0, &val, 1);
	udelay(1000);	/* delay NEEDED by keyboard PIC !!! */

	val = KEYBD_CMD_READ_STATUS;
	i2c_write (kbd_addr, 0, 0, &val, 1);
	i2c_read (kbd_addr, 0, 0, &val, 1);

	val &= KEYBD_STATUS_MASK;	/* clear unused bits */
	if (val) {			/* permanent error, report it */
		gd->kbd_status |= val;
		return;
	}

	/*
	 * Read current keyboard state.
	 *
         * After the error reset it may take some time before the
         * keyboard PIC picks up a valid keyboard scan - the total
         * scan time is approx. 1.6 ms (information by Martin Rajek,
         * 28 Sep 2002). We read a couple of times for the keyboard
         * to stabilize, using a big enough delay.
         * 10 times should be enough. If the data is still changing,
         * we use what we get :-(
	 */

	memset (tmp_data, 0xFF, KEYBD_DATALEN);	/* impossible value */
	for (i=0; i<10; ++i) {
		val = KEYBD_CMD_READ_KEYS;
		i2c_write (kbd_addr, 0, 0, &val, 1);
		i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);

		if (memcmp(kbd_data, tmp_data, KEYBD_DATALEN) == 0) {
			/* consistent state, done */
			break;
		}
		/* remeber last state, delay, and retry */
		memcpy (tmp_data, kbd_data, KEYBD_DATALEN);
		udelay (5000);
	}
}

/***********************************************************************
F* Function:     int misc_init_r (void) P*A*Z*
 *
P* Parameters:   none
P*
P* Returnvalue:  int
P*                - 0 is always returned, even in the case of a keyboard
P*                    error.
 *
Z* Intention:    This function is the misc_init_r() method implementation
Z*               for the lwmon board.
Z*               The keyboard controller is initialized and the result
Z*               of a read copied to the environment variable "keybd".
Z*               If KEYBD_SET_DEBUGMODE is defined, a check is made for
Z*               this key, and if found display to the LCD will be enabled.
Z*               The keys in "keybd" are checked against the magic
Z*               keycommands defined in the environment.
Z*               See also key_match().
 *
D* Design:       [e-mail]
C* Coding:       [e-mail]
V* Verification: [e-mail]
 ***********************************************************************/
int misc_init_r (void)
{
	DECLARE_GLOBAL_DATA_PTR;

	uchar kbd_data[KEYBD_DATALEN];
	uchar keybd_env[2 * KEYBD_DATALEN + 1];
	uchar kbd_init_status = gd->kbd_status >> 8;
	uchar kbd_status = gd->kbd_status;
	uchar val;
	uchar *str;
	int i;

	if (kbd_init_status) {
		printf ("KEYBD: Error %02X\n", kbd_init_status);
	}
	if (kbd_status) {		/* permanent error, report it */
		printf ("*** Keyboard error code %02X ***\n", kbd_status);
		sprintf (keybd_env, "%02X", kbd_status);
		setenv ("keybd", keybd_env);
		return 0;
	}

	/*
	 * Now we know that we have a working  keyboard,  so  disable
	 * all output to the LCD except when a key press is detected.
	 */

	if ((console_assign (stdout, "serial") < 0) ||
		(console_assign (stderr, "serial") < 0)) {
		printf ("Can't assign serial port as output device\n");
	}

	/* Read Version */
	val = KEYBD_CMD_READ_VERSION;
	i2c_write (kbd_addr, 0, 0, &val, 1);
	i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_VERSIONLEN);
	printf ("KEYBD: Version %d.%d\n", kbd_data[0], kbd_data[1]);

	/* Read current keyboard state */
	val = KEYBD_CMD_READ_KEYS;
	i2c_write (kbd_addr, 0, 0, &val, 1);
	i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);

	for (i = 0; i < KEYBD_DATALEN; ++i) {
		sprintf (keybd_env + i + i, "%02X", kbd_data[i]);
	}
	setenv ("keybd", keybd_env);

	str = strdup (key_match (kbd_data));	/* decode keys */
#ifdef KEYBD_SET_DEBUGMODE
	if (kbd_data[0] == KEYBD_SET_DEBUGMODE) {	/* set debug mode */
		if ((console_assign (stdout, "lcd") < 0) ||
			(console_assign (stderr, "lcd") < 0)) {
			printf ("Can't assign LCD display as output device\n");
		}
	}
#endif /* KEYBD_SET_DEBUGMODE */
#ifdef CONFIG_PREBOOT	/* automatically configure "preboot" command on key match */
	setenv ("preboot", str);	/* set or delete definition */
#endif /* CONFIG_PREBOOT */
	if (str != NULL) {
		free (str);
	}
	return (0);
}

#ifdef CONFIG_PREBOOT

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

static int compare_magic (uchar *kbd_data, uchar *str)
{
	uchar compare[KEYBD_DATALEN-1];
	uchar *nxt;
	int i;

	/* Don't include modifier byte */
	memcpy (compare, kbd_data+1, KEYBD_DATALEN-1);

	for (; str != NULL; str = (*nxt) ? nxt+1 : nxt) {
		uchar c;
		int k;

		c = (uchar) simple_strtoul (str, (char **) (&nxt), 16);

		if (str == nxt) {	/* invalid character */
			break;
		}

		/*
		 * Check if this key matches the input.
		 * Set matches to zero, so they match only once
		 * and we can find duplicates or extra keys
		 */
		for (k = 0; k < sizeof(compare); ++k) {
			if (compare[k] == '\0')	/* only non-zero entries */
				continue;
			if (c == compare[k]) {	/* found matching key */
				compare[k] = '\0';
				break;
			}
		}
		if (k == sizeof(compare)) {
			return -1;		/* unmatched key */
		}
	}

	/*
	 * A full match leaves no keys in the `compare' array,
	 */
	for (i = 0; i < sizeof(compare); ++i) {
		if (compare[i])
		{
			return -1;
		}
	}

	return 0;
}

/***********************************************************************
F* Function:     static uchar *key_match (uchar *kbd_data) P*A*Z*
 *
P* Parameters:   uchar *kbd_data
P*                - The keys to match against our magic definitions
P*
P* Returnvalue:  uchar *
P*                - != NULL: Pointer to the corresponding command(s)
P*                     NULL: No magic is about to happen
 *
Z* Intention:    Check if pressed key(s) match magic sequence,
Z*               and return the command string associated with that key(s).
Z*
Z*               If no key press was decoded, NULL is returned.
Z*
Z*               Note: the first character of the argument will be
Z*                     overwritten with the "magic charcter code" of the
Z*                     decoded key(s), or '\0'.
Z*
Z*               Note: the string points to static environment data
Z*                     and must be saved before you call any function that
Z*                     modifies the environment.
 *
D* Design:       [e-mail]
C* Coding:       [e-mail]
V* Verification: [e-mail]
 ***********************************************************************/
static uchar *key_match (uchar *kbd_data)
{
	uchar magic[sizeof (kbd_magic_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 = "";

	/* 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);
#if 0
		printf ("### Check magic \"%s\"\n", magic);
#endif
		if (compare_magic(kbd_data, getenv(magic)) == 0) {
			uchar cmd_name[sizeof (kbd_command_prefix) + 1];
			char *cmd;

			sprintf (cmd_name, "%s%c", kbd_command_prefix, *suffix);

			cmd = getenv (cmd_name);
#if 0
			printf ("### Set PREBOOT to $(%s): \"%s\"\n",
					cmd_name, cmd ? cmd : "<<NULL>>");
#endif
			*kbd_data = *suffix;
			return (cmd);
		}
	}
#if 0
	printf ("### Delete PREBOOT\n");
#endif
	*kbd_data = '\0';
	return (NULL);
}
#endif /* CONFIG_PREBOOT */

/*---------------Board Special Commands: PIC read/write ---------------*/

#if (CONFIG_COMMANDS & CFG_CMD_BSP)
/***********************************************************************
F* Function:     int do_pic (cmd_tbl_t *cmdtp, int flag,
F*                           int argc, char *argv[]) P*A*Z*
 *
P* Parameters:   cmd_tbl_t *cmdtp
P*                - Pointer to our command table entry
P*               int flag
P*                - If the CMD_FLAG_REPEAT bit is set, then this call is
P*                  a repetition
P*               int argc
P*                - Argument count
P*               char *argv[]
P*                - Array of the actual arguments
P*
P* Returnvalue:  int
P*                - 0  The command was handled successfully
P*                  1  An error occurred
 *
Z* Intention:    Implement the "pic [read|write]" commands.
Z*               The read subcommand takes one argument, the register,
Z*               whereas the write command takes two, the register and
Z*               the new value.
 *
D* Design:       [e-mail]
C* Coding:       [e-mail]
V* Verification: [e-mail]
 ***********************************************************************/
int do_pic (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	uchar reg, val;

	switch (argc) {
	case 3:					/* PIC read reg */
		if (strcmp (argv[1], "read") != 0)
			break;

		reg = simple_strtoul (argv[2], NULL, 16);

		printf ("PIC read: reg %02x: %02x\n\n", reg, pic_read (reg));

		return 0;
	case 4:					/* PIC write reg val */
		if (strcmp (argv[1], "write") != 0)
			break;

		reg = simple_strtoul (argv[2], NULL, 16);
		val = simple_strtoul (argv[3], NULL, 16);

		printf ("PIC write: reg %02x val 0x%02x: %02x => ",
				reg, val, pic_read (reg));
		pic_write (reg, val);
		printf ("%02x\n\n", pic_read (reg));
		return 0;
	default:
		break;
	}
	printf ("Usage:\n%s\n", cmdtp->usage);
	return 1;
}

/***********************************************************************
F* Function:     int do_kbd (cmd_tbl_t *cmdtp, int flag,
F*                           int argc, char *argv[]) P*A*Z*
 *
P* Parameters:   cmd_tbl_t *cmdtp
P*                - Pointer to our command table entry
P*               int flag
P*                - If the CMD_FLAG_REPEAT bit is set, then this call is
P*                  a repetition
P*               int argc
P*                - Argument count
P*               char *argv[]
P*                - Array of the actual arguments
P*
P* Returnvalue:  int
P*                - 0 is always returned.
 *
Z* Intention:    Implement the "kbd" command.
Z*               The keyboard status is read.  The result is printed on
Z*               the console and written into the "keybd" environment
Z*               variable.
 *
D* Design:       [e-mail]
C* Coding:       [e-mail]
V* Verification: [e-mail]
 ***********************************************************************/
int do_kbd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	uchar kbd_data[KEYBD_DATALEN];
	uchar keybd_env[2 * KEYBD_DATALEN + 1];
	uchar val;
	int i;

#if 0 /* Done in kbd_init */
	i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
#endif

	/* Read keys */
	val = KEYBD_CMD_READ_KEYS;
	i2c_write (kbd_addr, 0, 0, &val, 1);
	i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);

	puts ("Keys:");
	for (i = 0; i < KEYBD_DATALEN; ++i) {
		sprintf (keybd_env + i + i, "%02X", kbd_data[i]);
		printf (" %02x", kbd_data[i]);
	}
	putc ('\n');
	setenv ("keybd", keybd_env);
	return 0;
}

/* Read and set LSB switch */
#define CFG_PC_TXD1_ENA		0x0008		/* PC.12 */

/***********************************************************************
F* Function:     int do_lsb (cmd_tbl_t *cmdtp, int flag,
F*                           int argc, char *argv[]) P*A*Z*
 *
P* Parameters:   cmd_tbl_t *cmdtp
P*                - Pointer to our command table entry
P*               int flag
P*                - If the CMD_FLAG_REPEAT bit is set, then this call is
P*                  a repetition
P*               int argc
P*                - Argument count
P*               char *argv[]
P*                - Array of the actual arguments
P*
P* Returnvalue:  int
P*                - 0  The command was handled successfully
P*                  1  An error occurred
 *
Z* Intention:    Implement the "lsb [on|off]" commands.
Z*               The lsb is switched according to the first parameter by
Z*               by signaling the PIC I/O expander.
Z*               Called with no arguments, the current setting is
Z*               printed.
 *
D* Design:       [e-mail]
C* Coding:       [e-mail]
V* Verification: [e-mail]
 ***********************************************************************/
int do_lsb (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	uchar val;
	immap_t *immr = (immap_t *) CFG_IMMR;

	switch (argc) {
	case 1:					/* lsb - print setting */
		val = pic_read (0x60);
		printf ("LSB is o%s\n", (val & 0x20) ? "n" : "ff");
		return 0;
	case 2:					/* lsb on or lsb off - set switch */
		val = pic_read (0x60);

		if (strcmp (argv[1], "on") == 0) {
			val |= 0x20;
			immr->im_ioport.iop_pcpar &= ~(CFG_PC_TXD1_ENA);
			immr->im_ioport.iop_pcdat |= CFG_PC_TXD1_ENA;
			immr->im_ioport.iop_pcdir |= CFG_PC_TXD1_ENA;
		} else if (strcmp (argv[1], "off") == 0) {
			val &= ~0x20;
			immr->im_ioport.iop_pcpar &= ~(CFG_PC_TXD1_ENA);
			immr->im_ioport.iop_pcdat &= ~(CFG_PC_TXD1_ENA);
			immr->im_ioport.iop_pcdir |= CFG_PC_TXD1_ENA;
		} else {
			break;
		}
		pic_write (0x60, val);
		return 0;
	default:
		break;
	}
	printf ("Usage:\n%s\n", cmdtp->usage);
	return 1;
}

#endif /* CFG_CMD_BSP */

/*----------------------------- Utilities -----------------------------*/
/***********************************************************************
F* Function:     uchar pic_read (uchar reg) P*A*Z*
 *
P* Parameters:   uchar reg
P*                - Register to read
P*
P* Returnvalue:  uchar
P*                - Value read from register
 *
Z* Intention:    Read a register from the PIC I/O expander.
 *
D* Design:       [e-mail]
C* Coding:       [e-mail]
V* Verification: [e-mail]
 ***********************************************************************/
uchar pic_read (uchar reg)
{
	return (i2c_reg_read (CFG_I2C_PICIO_ADDR, reg));
}

/***********************************************************************
F* Function:     void pic_write (uchar reg, uchar val) P*A*Z*
 *
P* Parameters:   uchar reg
P*                - Register to read
P*               uchar val
P*                - Value to write
P*
P* Returnvalue:  none
 *
Z* Intention:    Write to a register on the PIC I/O expander.
 *
D* Design:       [e-mail]
C* Coding:       [e-mail]
V* Verification: [e-mail]
 ***********************************************************************/
void pic_write (uchar reg, uchar val)
{
	i2c_reg_write (CFG_I2C_PICIO_ADDR, reg, val);
}

/*---------------------- Board Control Functions ----------------------*/
/***********************************************************************
F* Function:     void board_poweroff (void) P*A*Z*
 *
P* Parameters:   none
P*
P* Returnvalue:  none
 *
Z* Intention:    Turn off the battery power and loop endless, so this
Z*               should better be the last function you call...
 *
D* Design:       [e-mail]
C* Coding:       [e-mail]
V* Verification: [e-mail]
 ***********************************************************************/
void board_poweroff (void)
{
    /* Turn battery off */
    ((volatile immap_t *)CFG_IMMR)->im_ioport.iop_pcdat &= ~(1 << (31 - 13));

    while (1);
}

#ifdef CONFIG_MODEM_SUPPORT
static int key_pressed(void)
{
	uchar kbd_data[KEYBD_DATALEN];
	uchar val;

	/* Read keys */
	val = KEYBD_CMD_READ_KEYS;
	i2c_write (kbd_addr, 0, 0, &val, 1);
	i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);

	return (compare_magic(kbd_data, CONFIG_MODEM_KEY_MAGIC) == 0);
}
#endif	/* CONFIG_MODEM_SUPPORT */