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sparc,sunzilog: Add console polling support for sunzilog serial driver

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Allow kgdboc to work on sparc hardware with the Zilog serial chips.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wessel 2010-05-20 21:04:23 -05:00
parent 3f255eb37e
commit 6d45a1aed3
1 changed files with 50 additions and 0 deletions
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50
drivers/serial/sunzilog.c
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@ -102,6 +102,8 @@ struct uart_sunzilog_port {
#endif #endif
}; };
static void sunzilog_putchar(struct uart_port *port, int ch);
#define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase)) #define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
#define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT)) #define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
@ -996,6 +998,50 @@ static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *se
return -EINVAL; return -EINVAL;
} }
#ifdef CONFIG_CONSOLE_POLL
static int sunzilog_get_poll_char(struct uart_port *port)
{
unsigned char ch, r1;
struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
struct zilog_channel __iomem *channel
= ZILOG_CHANNEL_FROM_PORT(&up->port);
r1 = read_zsreg(channel, R1);
if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
writeb(ERR_RES, &channel->control);
ZSDELAY();
ZS_WSYNC(channel);
}
ch = readb(&channel->control);
ZSDELAY();
/* This funny hack depends upon BRK_ABRT not interfering
* with the other bits we care about in R1.
*/
if (ch & BRK_ABRT)
r1 |= BRK_ABRT;
if (!(ch & Rx_CH_AV))
return NO_POLL_CHAR;
ch = readb(&channel->data);
ZSDELAY();
ch &= up->parity_mask;
return ch;
}
static void sunzilog_put_poll_char(struct uart_port *port,
unsigned char ch)
{
struct uart_sunzilog_port *up = (struct uart_sunzilog_port *)port;
sunzilog_putchar(&up->port, ch);
}
#endif /* CONFIG_CONSOLE_POLL */
static struct uart_ops sunzilog_pops = { static struct uart_ops sunzilog_pops = {
.tx_empty = sunzilog_tx_empty, .tx_empty = sunzilog_tx_empty,
.set_mctrl = sunzilog_set_mctrl, .set_mctrl = sunzilog_set_mctrl,
@ -1013,6 +1059,10 @@ static struct uart_ops sunzilog_pops = {
.request_port = sunzilog_request_port, .request_port = sunzilog_request_port,
.config_port = sunzilog_config_port, .config_port = sunzilog_config_port,
.verify_port = sunzilog_verify_port, .verify_port = sunzilog_verify_port,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = sunzilog_get_poll_char,
.poll_put_char = sunzilog_put_poll_char,
#endif
}; };
static int uart_chip_count; static int uart_chip_count;