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authorDavid Woodhouse <dwmw2@infradead.org>2007-04-05 00:19:43 +1000
committerPaul Mackerras <paulus@samba.org>2007-09-22 14:49:21 +1000
commite4533b243e5e0c3a26287a902a1ed0f8f5b1cec0 (patch)
tree806ef6091f0a434c7c95560d6b24bcde113614ef /drivers/serial
parentc4d5e375470862fd741f93bf0686d7ac2f7fdce4 (diff)
downloadop-kernel-dev-e4533b243e5e0c3a26287a902a1ed0f8f5b1cec0.zip
op-kernel-dev-e4533b243e5e0c3a26287a902a1ed0f8f5b1cec0.tar.gz
[POWERPC] Optionally use new device number for pmac_zilog
This adds the option for the pmac_zilog driver to use the major/minor numbers recently allocated specifically for it (/dev/ttyPZn) instead of the /dev/ttySn numbers. The advantage of doing this is that it allows the pmac_zilog and 8250 drivers to coexist. The disadvantage of doing this is that it is a user-visible ABI change and it will break existing working setups on powermacs, and could be confusing to users. Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/Kconfig25
-rw-r--r--drivers/serial/pmac_zilog.c20
2 files changed, 40 insertions, 5 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 81b52b7..d6ae38e 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -986,6 +986,31 @@ config SERIAL_PMACZILOG
PowerMac machines.
Say Y or M if you want to be able to these serial ports.
+config SERIAL_PMACZILOG_TTYS
+ bool "Use ttySn device nodes for Zilog z85c30"
+ depends on SERIAL_PMACZILOG
+ help
+ The pmac_zilog driver for the z85C30 chip on many powermacs
+ historically used the device numbers for /dev/ttySn. The
+ 8250 serial port driver also uses these numbers, which means
+ the two drivers being unable to coexist; you could not use
+ both z85C30 and 8250 type ports at the same time.
+
+ If this option is not selected, the pmac_zilog driver will
+ use the device numbers allocated for /dev/ttyPZn. This allows
+ the pmac_zilog and 8250 drivers to co-exist, but may cause
+ existing userspace setups to break. Programs that need to
+ access the built-in serial ports on powermacs will need to
+ be reconfigured to use /dev/ttyPZn instead of /dev/ttySn.
+
+ If you enable this option, any z85c30 ports in the system will
+ be registered as ttyS0 onwards as in the past, and you will be
+ unable to use the 8250 module for PCMCIA or other 16C550-style
+ UARTs.
+
+ Say N unless you need the z85c30 ports on your powermac
+ to appear as /dev/ttySn.
+
config SERIAL_PMACZILOG_CONSOLE
bool "Console on PowerMac z85c30 serial port"
depends on SERIAL_PMACZILOG=y
diff --git a/drivers/serial/pmac_zilog.c b/drivers/serial/pmac_zilog.c
index f793ac2..794bd0f 100644
--- a/drivers/serial/pmac_zilog.c
+++ b/drivers/serial/pmac_zilog.c
@@ -88,6 +88,16 @@ MODULE_LICENSE("GPL");
#define PWRDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg)
+#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
+#define PMACZILOG_MAJOR TTY_MAJOR
+#define PMACZILOG_MINOR 64
+#define PMACZILOG_NAME "ttyS"
+#else
+#define PMACZILOG_MAJOR 204
+#define PMACZILOG_MINOR 192
+#define PMACZILOG_NAME "ttyPZ"
+#endif
+
/*
* For the sake of early serial console, we can do a pre-probe
@@ -99,9 +109,10 @@ static DEFINE_MUTEX(pmz_irq_mutex);
static struct uart_driver pmz_uart_reg = {
.owner = THIS_MODULE,
- .driver_name = "ttyS",
- .dev_name = "ttyS",
- .major = TTY_MAJOR,
+ .driver_name = PMACZILOG_NAME,
+ .dev_name = PMACZILOG_NAME,
+ .major = PMACZILOG_MAJOR,
+ .minor = PMACZILOG_MINOR,
};
@@ -1778,7 +1789,7 @@ static void pmz_console_write(struct console *con, const char *s, unsigned int c
static int __init pmz_console_setup(struct console *co, char *options);
static struct console pmz_console = {
- .name = "ttyS",
+ .name = PMACZILOG_NAME,
.write = pmz_console_write,
.device = uart_console_device,
.setup = pmz_console_setup,
@@ -1802,7 +1813,6 @@ static int __init pmz_register(void)
pmz_uart_reg.nr = pmz_ports_count;
pmz_uart_reg.cons = PMACZILOG_CONSOLE;
- pmz_uart_reg.minor = 64;
/*
* Register this driver with the serial core
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