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Commit 52885b32 authored by David Howells's avatar David Howells
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MN10300: Allow KGDB to use the MN10300 serial ports 



Allow KGDB to use the MN10300 serial ports through the polled I/O interface
provided via the TTY/serial layer and the kgdboc driver.  This allows the
kernel to be started with something like:

	kgdboc=ttySM0,115200

added to the command line.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent 5141c46c

arch/mn10300/kernel/mn10300-serial.c

+75 −0
Original line number Diff line number Diff line
@@ -119,6 +119,10 @@ static int mn10300_serial_request_port(struct uart_port *); 
static void mn10300_serial_config_port(struct uart_port *, int);

static int mn10300_serial_verify_port(struct uart_port *,

					struct serial_struct *);

#ifdef CONFIG_CONSOLE_POLL

static void mn10300_serial_poll_put_char(struct uart_port *, unsigned char);

static int mn10300_serial_poll_get_char(struct uart_port *);

#endif



static const struct uart_ops mn10300_serial_ops = {

	.tx_empty	= mn10300_serial_tx_empty,
@@ -138,6 +142,10 @@ static const struct uart_ops mn10300_serial_ops = { 
	.request_port	= mn10300_serial_request_port,

	.config_port	= mn10300_serial_config_port,

	.verify_port	= mn10300_serial_verify_port,

#ifdef CONFIG_CONSOLE_POLL

	.poll_put_char	= mn10300_serial_poll_put_char,

	.poll_get_char	= mn10300_serial_poll_get_char,

#endif

};



static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id);
@@ -1634,3 +1642,70 @@ static int __init mn10300_serial_console_init(void) 


console_initcall(mn10300_serial_console_init);

#endif



#ifdef CONFIG_CONSOLE_POLL

/*

 * Polled character reception for the kernel debugger

 */

static int mn10300_serial_poll_get_char(struct uart_port *_port)

{

	struct mn10300_serial_port *port =

		container_of(_port, struct mn10300_serial_port, uart);

	unsigned ix;

	u8 st, ch;



	_enter("%s", port->name);



	do {

		/* pull chars out of the hat */

		ix = port->rx_outp;

		if (ix == port->rx_inp)

			return NO_POLL_CHAR;



		ch = port->rx_buffer[ix++];

		st = port->rx_buffer[ix++];

		smp_rmb();

		port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1);



	} while (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF));



	return ch;

}





/*

 * Polled character transmission for the kernel debugger

 */

static void mn10300_serial_poll_put_char(struct uart_port *_port,

					 unsigned char ch)

{

	struct mn10300_serial_port *port =

		container_of(_port, struct mn10300_serial_port, uart);

	u8 intr, tmp;



	/* wait for the transmitter to finish anything it might be doing (and

	 * this includes the virtual DMA handler, so it might take a while) */

	while (*port->_status & (SC01STR_TBF | SC01STR_TXF))

		continue;



	/* disable the Tx ready interrupt */

	intr = *port->_intr;

	*port->_intr = intr & ~SC01ICR_TI;

	tmp = *port->_intr;



	if (ch == 0x0a) {

		*(u8 *) port->_txb = 0x0d;

		while (*port->_status & SC01STR_TBF)

			continue;

	}



	*(u8 *) port->_txb = ch;

	while (*port->_status & SC01STR_TBF)

		continue;



	/* restore the Tx interrupt flag */

	*port->_intr = intr;

	tmp = *port->_intr;

}



#endif /* CONFIG_CONSOLE_POLL */