lwmon.c

嵌入式试验箱S3C2410的bootloader源代码

C* Coding:       [e-mail]
V* Verification: [e-mail]
 ***********************************************************************/
static uchar *key_match (uchar *kbd_data)
{
	char magic[sizeof (kbd_magic_prefix) + 1];
	uchar *suffix;
	char *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=(uchar *)kbd_magic_keys; *suffix || suffix==(uchar *)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, (uchar *)getenv(magic)) == 0) {
			char 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 ((uchar *)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;
}
U_BOOT_CMD(
	pic,	4,	1,	do_pic,
	"pic     - read and write PIC registers\n",
	"read  reg      - read PIC register `reg'\n"
	"pic write reg val  - write value `val' to PIC register `reg'\n"
);

/***********************************************************************
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];
	char 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;
}

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

/* 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;
}

U_BOOT_CMD(
	lsb,	2,	1,	do_lsb,
	"lsb     - check and set LSB switch\n",
	"on  - switch LSB on\n"
	"lsb off - switch LSB off\n"
	"lsb     - print current setting\n"
);

#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, (uchar *)CONFIG_MODEM_KEY_MAGIC) == 0);
}
#endif	/* CONFIG_MODEM_SUPPORT */

#ifdef CONFIG_POST
/*
 * Returns 1 if keys pressed to start the power-on long-running tests
 * Called from board_init_f().
 */
int post_hotkeys_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, (uchar *)CONFIG_POST_KEY_MAGIC) == 0);
}
#endif