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Commit 8c653186 authored by Chris J Arges's avatar Chris J Arges Committed by Paul Mackerras
Browse files

serial/pmac_zilog: Add console polling support 



This implements poll_get_char and poll_put_char for console polling,
which enables kgdb to work on machines that use the pmac_zilog serial
driver, for example the Apple PowerMac G5.

Signed-off-by: default avatarChris J Arges <arges@linux.vnet.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 9b82f3e6

drivers/serial/pmac_zilog.c

+27 −0
Original line number Diff line number Diff line
@@ -1383,6 +1383,29 @@ static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser) 
	return -EINVAL;

}



#ifdef CONFIG_CONSOLE_POLL



static int pmz_poll_get_char(struct uart_port *port)

{

	struct uart_pmac_port *uap = (struct uart_pmac_port *)port;



	while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0)

		udelay(5);

	return read_zsdata(uap);

}



static void pmz_poll_put_char(struct uart_port *port, unsigned char c)

{

	struct uart_pmac_port *uap = (struct uart_pmac_port *)port;



	/* Wait for the transmit buffer to empty. */

	while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)

		udelay(5);

	write_zsdata(uap, c);

}



#endif



static struct uart_ops pmz_pops = {

	.tx_empty	=	pmz_tx_empty,

	.set_mctrl	=	pmz_set_mctrl,
@@ -1400,6 +1423,10 @@ static struct uart_ops pmz_pops = { 
	.request_port	=	pmz_request_port,

	.config_port	=	pmz_config_port,

	.verify_port	=	pmz_verify_port,

#ifdef CONFIG_CONSOLE_POLL

	.poll_get_char	=	pmz_poll_get_char,

	.poll_put_char	=	pmz_poll_put_char,

#endif

};



/*