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Date: Tue, 14 Oct 2008 15:31:09 -0700
From: donald.d.dugger@...el.com
To: linux-kernel@...r.kernel.org
Subject: [PATCH] Enable console on PCI serial devices
The problem with using a PCI serial card for the console is that, until
the PCI serial driver is loaded, output will be lost. The issue is that
PCI serial devices use a non-standard I/O port address and sometimes use
a non-standard crystal frequency. This patch gets around those problems
by allowing you to specify both I/O port address and crystal frequency on
the kernel command line. The serial console specification is enhanced to be:
BBBBPNF-III/CCC
where BBBB is the baud rate, P is the parity, N is the number of bits,
F is the flow control, III is the I/O port address (prefix with 0x for
hexadecimal) and CCC is the crystal frequency. -III and /CCC are optional
and can be omitted although -III must be specified if you want to set
/CCC. For example, the option I use is:
console=ttyS0,115200-0xe880/921600
Signed-off-by: Don Dugger <donald.d.dugger@...el.com>
Documentation/serial-console.txt | 12 ++++++++----
drivers/serial/8250.c | 2 +-
drivers/serial/serial_core.c | 26 ++++++++++++++++++++++----
include/linux/serial_core.h | 2 +-
4 files changed, 32 insertions(+), 10 deletions(-)
----- cut here for patch.d/pci_serial-1014.patch -----
diff --git a/Documentation/serial-console.txt b/Documentation/serial-console.txt
index 9a7bc8b..8cffce6 100644
--- a/Documentation/serial-console.txt
+++ b/Documentation/serial-console.txt
@@ -21,10 +21,14 @@ The format of this option is:
options: depend on the driver. For the serial port this
defines the baudrate/parity/bits/flow control of
- the port, in the format BBBBPNF, where BBBB is the
- speed, P is parity (n/o/e), N is number of bits,
- and F is flow control ('r' for RTS). Default is
- 9600n8. The maximum baudrate is 115200.
+ the port, in the format BBBBPNF-III/CCC, where BBBB
+ is the speed, P is parity (n/o/e), N is number of bits,
+ F is flow control ('r' for RTS), III is I/O port
+ address (prefix with 0x for hexadecimal) and CCC is
+ the uart crystal frequency. Default is 9600n8. The
+ I/O port defaults to 0x3f8 for ttyS0 and 0x2f8 for
+ ttyS1. The default crystal frequency is 1843200.
+ The maximum baudrate is 115200.
You can specify multiple console= options on the kernel command line.
Output will appear on all of them. The last device will be used when
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index d3ca7d3..5d59cf7 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2632,7 +2632,7 @@ static int __init serial8250_console_setup(struct console *co, char *options)
return -ENODEV;
if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
+ uart_parse_options(options, &baud, &parity, &bits, &flow, &port->iobase, &port->uartclk);
return uart_set_options(port, co, baud, parity, bits, flow);
}
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 6bdf336..31b5545 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -1864,25 +1864,43 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
* @parity: pointer to an 'int' variable for the parity.
* @bits: pointer to an 'int' variable for the number of data bits.
* @flow: pointer to an 'int' variable for the flow control character.
+ * @ioport: pointer to an 'int' variable for the I/O base for device
+ * @clk: pointer to an 'int' variable for the clock devisor
*
* uart_parse_options decodes a string containing the serial console
* options. The format of the string is <baud><parity><bits><flow>,
* eg: 115200n8r
*/
void
-uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow)
+uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow, int *ioport, int *clk)
{
char *s = options;
*baud = simple_strtoul(s, NULL, 10);
while (*s >= '0' && *s <= '9')
s++;
- if (*s)
+ if (*s && (*s != '-'))
*parity = *s++;
- if (*s)
+ if (*s && (*s != '-'))
*bits = *s++ - '0';
- if (*s)
+ if (*s && (*s != '-'))
*flow = *s;
+ if (*s && (*s != '-'))
+ *flow = *s++;
+ if (*s++ == '-') {
+ int b;
+
+ if (*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X')) {
+ s += 2;
+ b = 16;
+ } else
+ b = 10;
+ *ioport = simple_strtoul(s, NULL, b);
+ while (*s && (*s != '/'))
+ s++;
+ if (*s == '/')
+ *clk = simple_strtoul(s + 1, NULL, 10) << 4;
+ }
}
EXPORT_SYMBOL_GPL(uart_parse_options);
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index e27f216..3b4fb3a 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -402,7 +402,7 @@ unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
struct uart_port *uart_get_console(struct uart_port *ports, int nr,
struct console *c);
void uart_parse_options(char *options, int *baud, int *parity, int *bits,
- int *flow);
+ int *flow, int *iobase, int *clk);
int uart_set_options(struct uart_port *port, struct console *co, int baud,
int parity, int bits, int flow);
struct tty_driver *uart_console_device(struct console *co, int *index);
--
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