Add sbbc(4), a driver for the BootBus controller found in Serengeti and

StarCat systems which provides time-of-day services for both as well as
console service for Serengeti, i.e. Sun Fire V1280. While the latter is
described with a device type of serial in the OFW device tree, it isn't
actually an UART. Nevertheless the console service is handled by uart(4)
as this allowed to re-use quite a bit of MD and MI code. Actually, this
idea is stolen from Linux which interfaces the sun4v hypervisor console
with the Linux counterpart of uart(4).

2 files changed, 12 insertions, 0 deletions

diff --git a/sys/dev/uart/uart.h b/sys/dev/uart/uart.h
index eb66da0..bd7861d 100644
--- a/sys/dev/uart/uart.h
+++ b/sys/dev/uart/uart.h
@@ -67,6 +67,7 @@ struct uart_class;
 extern struct uart_class uart_ns8250_class __attribute__((weak));
 extern struct uart_class uart_quicc_class __attribute__((weak));
 extern struct uart_class uart_sab82532_class __attribute__((weak));
+extern struct uart_class uart_sbbc_class __attribute__((weak));
 extern struct uart_class uart_z8530_class __attribute__((weak));
 
 #ifdef PC98
diff --git a/sys/dev/uart/uart_cpu_sparc64.c b/sys/dev/uart/uart_cpu_sparc64.c
index 0f40cb7..c89b39f 100644
--- a/sys/dev/uart/uart_cpu_sparc64.c
+++ b/sys/dev/uart/uart_cpu_sparc64.c
@@ -133,6 +133,14 @@ uart_cpu_getdev_console(phandle_t options, char *dev, size_t devsz)
 		return (-1);
 	if (strcmp(buf, "serial") != 0)
 		return (-1);
+	/* For a Serengeti console device point to the bootbus controller. */
+	if (OF_getprop(input, "name", buf, sizeof(buf)) > 0 &&
+	    !strcmp(buf, "sgcn")) {
+		if ((chosen = OF_finddevice("/chosen")) == -1)
+			return (-1);
+		if (OF_getprop(chosen, "iosram", &input, sizeof(input)) == -1)
+			return (-1);
+	}
 	return (input);
 }
 
@@ -258,6 +266,9 @@ uart_cpu_getdev(int devtype, struct uart_devinfo *di)
 	    !strcmp(compat, "su16552")) {
 		class = &uart_ns8250_class;
 		di->bas.chan = 0;
+	} else if (!strcmp(compat, "sgsbbc")) {
+		class = &uart_sbbc_class;
+		di->bas.chan = 0;
 	}
 	if (class == NULL)
 		return (ENXIO);