Get nexus(4) out of the RTC business. The interface used by nexus(4)

in Open Firmware was Apple-specific, and we have complete coverage of Apple
system controllers, so move RTC responsibilities into the system controller
drivers. This avoids interesting problems from manipulating these devices
through Open Firmware behind the backs of their drivers.

Obtained from:	NetBSD
MFC after:	2 weeks

1 files changed, 67 insertions, 0 deletions

diff --git a/sys/powerpc/powermac/smu.c b/sys/powerpc/powermac/smu.c
index 6754b3b..1001876 100644
--- a/sys/powerpc/powermac/smu.c
+++ b/sys/powerpc/powermac/smu.c
@@ -34,6 +34,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/module.h>
 #include <sys/conf.h>
 #include <sys/cpu.h>
+#include <sys/clock.h>
 #include <sys/ctype.h>
 #include <sys/kernel.h>
 #include <sys/kthread.h>
@@ -51,6 +52,8 @@ __FBSDID("$FreeBSD$");
 #include <dev/ofw/ofw_bus.h>
 #include <powerpc/powermac/macgpiovar.h>
 
+#include "clock_if.h"
+
 struct smu_cmd {
 	volatile uint8_t cmd;
 	uint8_t		len;
@@ -140,6 +143,10 @@ static int	smu_attach(device_t);
 static void	smu_cpufreq_pre_change(device_t, const struct cf_level *level);
 static void	smu_cpufreq_post_change(device_t, const struct cf_level *level);
 
+/* clock interface */
+static int	smu_gettime(device_t dev, struct timespec *ts);
+static int	smu_settime(device_t dev, struct timespec *ts);
+
 /* utility functions */
 static int	smu_run_cmd(device_t dev, struct smu_cmd *cmd, int wait);
 static int	smu_get_datablock(device_t dev, int8_t id, uint8_t *buf,
@@ -160,6 +167,10 @@ static device_method_t  smu_methods[] = {
 	/* Device interface */
 	DEVMETHOD(device_probe,		smu_probe),
 	DEVMETHOD(device_attach,	smu_attach),
+
+	/* Clock interface */
+	DEVMETHOD(clock_gettime,	smu_gettime),
+	DEVMETHOD(clock_settime,	smu_settime),
 	{ 0, 0 },
 };
 
@@ -192,6 +203,9 @@ MALLOC_DEFINE(M_SMU, "smu", "SMU Sensor Information");
 #define  SMU_PWR_GET_POWERUP	0x00
 #define  SMU_PWR_SET_POWERUP	0x01
 #define  SMU_PWR_CLR_POWERUP	0x02
+#define SMU_RTC			0x8e
+#define  SMU_RTC_GET		0x81
+#define  SMU_RTC_SET		0x80
 
 /* Power event types */
 #define SMU_WAKEUP_KEYPRESS	0x01
@@ -349,6 +363,11 @@ smu_attach(device_t dev)
 	powerpc_config_intr(rman_get_start(sc->sc_doorbellirq),
 	    INTR_TRIGGER_EDGE, INTR_POLARITY_LOW);
 
+	/*
+	 * Connect RTC interface.
+	 */
+	clock_register(dev, 1000);
+
 	return (0);
 }
 
@@ -1043,3 +1062,51 @@ smu_server_mode(SYSCTL_HANDLER_ARGS)
 	return (smu_run_cmd(smu, &cmd, 1));
 }
 
+static int
+smu_gettime(device_t dev, struct timespec *ts)
+{
+	struct smu_cmd cmd;
+	struct clocktime ct;
+
+	cmd.cmd = SMU_RTC;
+	cmd.len = 1;
+	cmd.data[0] = SMU_RTC_GET;
+
+	if (smu_run_cmd(dev, &cmd, 1) != 0)
+		return (ENXIO);
+
+	ct.nsec	= 0;
+	ct.sec	= bcd2bin(cmd.data[0]);
+	ct.min	= bcd2bin(cmd.data[1]);
+	ct.hour	= bcd2bin(cmd.data[2]);
+	ct.dow	= bcd2bin(cmd.data[3]);
+	ct.day	= bcd2bin(cmd.data[4]);
+	ct.mon	= bcd2bin(cmd.data[5]);
+	ct.year	= bcd2bin(cmd.data[6]) + 2000;
+
+	return (clock_ct_to_ts(&ct, ts));
+}
+
+static int
+smu_settime(device_t dev, struct timespec *ts)
+{
+	struct smu_cmd cmd;
+	struct clocktime ct;
+
+	cmd.cmd = SMU_RTC;
+	cmd.len = 8;
+	cmd.data[0] = SMU_RTC_SET;
+
+	clock_ts_to_ct(ts, &ct);
+
+	cmd.data[1] = bin2bcd(ct.sec);
+	cmd.data[2] = bin2bcd(ct.min);
+	cmd.data[3] = bin2bcd(ct.hour);
+	cmd.data[4] = bin2bcd(ct.dow);
+	cmd.data[5] = bin2bcd(ct.day);
+	cmd.data[6] = bin2bcd(ct.mon);
+	cmd.data[7] = bin2bcd(ct.year - 2000);
+
+	return (smu_run_cmd(dev, &cmd, 1));
+}
+