[PATCH] OLPC rtc-cmos support

Marcelo Tosatti
2007-07-08T03:55:04Z

Hi,

The following patch implements the hooks necessary for OLPC to use the
rtc-cmos driver. This is necessary since we do not want CONFIG_PNP.

This makes it possible to control rtc wakeup via
/sys/devices/platform/rtc_cmos/power/wakeup.

Comments?

diff --git a/arch/i386/kernel/olpc-pm.c b/arch/i386/kernel/olpc-pm.c
index 9599dbe..d92c54a 100644
--- a/arch/i386/kernel/olpc-pm.c
+++ b/arch/i386/kernel/olpc-pm.c
@@ -11,6 +11,9 @@ #include <linux/delay.h>
#include <linux/input.h>
#include <linux/suspend.h>
#include <linux/bootmem.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/mc146818rtc.h>
#include <asm/io.h>

#include <asm/olpc.h>
@@ -272,6 +275,8 @@ static int olpc_pm_enter(suspend_state_t
return 0;
}

+static u16 olpc_wakeup_mask = CS5536_PM_PWRBTN;
+
int asmlinkage olpc_do_sleep(u8 sleep_state)
{
void *pgd_addr = __va(read_cr3());
@@ -282,7 +287,7 @@ int asmlinkage olpc_do_sleep(u8 sleep_st

/* FIXME: Set any other SCI events that we might want here */

- outl((CS5536_PM_PWRBTN << 16) | 0xFFFF, acpi_base + PM1_STS);
+ outl((olpc_wakeup_mask << 16) | 0xFFFF, acpi_base + PM1_STS);

/* If we are in test mode, then just return (simulate a successful
suspend/resume). Otherwise, if we are doing the real thing,
@@ -549,6 +554,92 @@ static int __init olpc_pm_init(void)
return 0;
}

+
+#if defined (CONFIG_RTC_DRV_CMOS) || defined (CONFIG_RTC_DRV_CMOS_MODULE)
+struct resource rtc_platform_resource[2] = {
+ {
+ .flags = IORESOURCE_IO,
+ .start = RTC_PORT(0),
+ .end = RTC_PORT(0) + RTC_IO_EXTENT
+ },
+ {
+ .flags = IORESOURCE_IRQ,
+ .start = 8,
+ .end = 8,
+ },
+};
+
+struct resource rtc_platform_irq = {
+ .flags = IORESOURCE_IRQ,
+ .start = 8,
+ .end = 8,
+};
+
+static int olpc_add_rtc(void)
+{
+ struct platform_device *pd;
+
+ pd = platform_device_register_simple("rtc_cmos", -1,
+ rtc_platform_resource, 2);
+ if (IS_ERR(pd))
+ return PTR_ERR(pd);
+
+ /* rtc-cmos only supports 24-hr mode */
+ CMOS_WRITE(CMOS_READ(RTC_CONTROL) | RTC_24H, RTC_CONTROL);
+
+ return 0;
+}
+arch_initcall(olpc_add_rtc);
+
+static struct cmos_rtc_board_info rtc_info;
+
+static void rtc_wake_on(struct device *dev)
+{
+ olpc_wakeup_mask |= CS5536_PM_RTC;
+}
+
+static void rtc_wake_off(struct device *dev)
+{
+ olpc_wakeup_mask &= ~(CS5536_PM_RTC);
+}
+
+static int rtc_match(struct device *dev, void *data)
+{
+ static const char *devname = { "rtc_cmos" };
+ struct rtc_device *rtcdev = to_rtc_device(dev);
+
+ if (!strcmp(devname, rtcdev->name))
+ return 1;
+
+ return 0;
+}
+
+static struct device * get_rtc_dev(void)
+{
+ return bus_find_device(&platform_bus_type, NULL, NULL, rtc_match);
+}
+
+static int olpc_rtc_init(void)
+{
+ struct device *dev = get_rtc_dev();
+
+ if (dev) {
+ rtc_info.rtc_day_alarm = 0;
+ rtc_info.rtc_mon_alarm = 0;
+ rtc_info.rtc_century = 0;
+ rtc_info.wake_on = rtc_wake_on;
+ rtc_info.wake_off = rtc_wake_off;
+
+ dev->platform_data = &rtc_info;
+
+ device_init_wakeup(dev, 1);
+ } else
+ printk(KERN_ERR "no rtc\n");
+ return 0;
+}
+fs_initcall(olpc_rtc_init);
+#endif /* CONFIG_RTC_DRV_CMOS */
+
static void olpc_pm_exit(void)
{
/* Clear any pending events, and disable them */