static int __init kgdb_parse_options(char *options)
{
char c;
int baud;
/* Check for port spec (or use default) */
/* Determine port type and instance */
if (!memcmp(options, "tty", 3)) {
struct kgdb_sermap *map = kgdb_serlist;
while (map && memcmp(options, map->name, map->namelen))
map = map->next;
if (!map) {
KGDB_PRINTK("unknown port spec in %s\n", options);
return -1;
}
kgdb_porttype = map;
kgdb_serial_setup = map->setup_fn;
kgdb_portnum = options[map->namelen] - '0';
options += map->namelen + 1;
options = (*options == ',') ? options+1 : options;
/* Read optional parameters (baud/parity/bits) */
baud = simple_strtoul(options, &options, 10);
if (baud != 0) {
kgdb_baud = baud;
c = toupper(*options);
if (c == 'E' || c == 'O' || c == 'N') {
kgdb_parity = c;
options++;
}
c = *options;
if (c == '7' || c == '8') {
kgdb_bits = c;
options++;
}
options = (*options == ',') ? options+1 : options;
}
}
/* Check for action specification */
if (!memcmp(options, "halt", 4)) {
kgdb_halt = 1;
options += 4;
} else if (!memcmp(options, "disabled", 8)) {
kgdb_enabled = 0;
options += 8;
}
if (*options) {
KGDB_PRINTK("ignored unknown options: %s\n", options);
return 0;
}
return 1;
}
/*
* Initialize UART to configured/requested values.
* (But we don't interrupts yet, or interact w/serial.c)
*/
static int kgdb_uart_setup(void)
{
int port;
int lcr = 0;
int bdiv = 0;
if (kgdb_portnum >= UART_NPORTS) {
KGDB_PRINTK("uart port %d invalid.\n", kgdb_portnum);
return -1;
}
kgdb_uart_port = &uart_ports[kgdb_portnum];
/* Init sequence from gdb_hook_interrupt */
UART_IN(UART_RX);
UART_OUT(UART_IER, 0);
UART_IN(UART_RX); /* Serial driver comments say */
UART_IN(UART_IIR); /* this clears interrupt regs */
UART_IN(UART_MSR);
/* Figure basic LCR values */
switch (kgdb_bits) {
case '7':
lcr |= UART_LCR_WLEN7;
break;
default: case '8':
lcr |= UART_LCR_WLEN8;
break;
}
switch (kgdb_parity) {
case 'O':
lcr |= UART_LCR_PARITY;
break;
case 'E':
lcr |= (UART_LCR_PARITY | UART_LCR_EPAR);
break;
default: break;
}
/* Figure the baud rate divisor */
bdiv = (SB_BASE/kgdb_baud);
/* Set the baud rate and LCR values */
UART_OUT(UART_LCR, (lcr | UART_LCR_DLAB));
UART_OUT(UART_DLL, (bdiv & 0xff));
UART_OUT(UART_DLM, ((bdiv >> 8) & 0xff));
UART_OUT(UART_LCR, lcr);
/* Set the MCR */
UART_OUT(UART_MCR, SB_MCR);
/* Turn off FIFOs for now */
UART_OUT(UART_FCR, 0);
/* Setup complete: initialize function pointers */
kgdb_getchar = kgdb_uart_getchar;
kgdb_putchar = kgdb_uart_putchar;
return 0;
}