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Date: Tue, 19 Dec 2006 01:06:01 -0800
From: David Brownell <david-b@...bell.net>
To: Paul Sokolovsky <pmiscml@...il.com>
Cc: kernel-discuss@...dhelds.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [PATCH] RTC classdev: Add sysfs support for wakeup alarm (r/w)
On Monday 18 December 2006 10:41 pm, Paul Sokolovsky wrote:
>
> Do you mean enable_irq_wake()/disable_irq_wake() calls? In what way
> they are buggy? The only "bug" with them I see is that they are not
> implemented for PXA,
Notice how the number of enables and disables don't balance, and then
how the genirq framework handles such unbalanced calls. Appended see
a "should make it all work" patch. Test with the "rtcwake.c" program;
I'd expect pxa2[1567]x and sa1100 to work ... but obviously, there are
many more wakeup event sources that could be supported.
> This is pretty interesting topic for us, and so far in handhelds.org
> ports we don't handle dynamic wakeup configuration at all, so I would
> eagerly expect your samples. In the meantime, I went and hacked
> .set_wake methods for PXA's irq_chips. And that's when I got idea why
> it might haven't been implemented at all - PXA27x's model of wakeup
> sources is a bit weird comparing with nice and clean PXA25x's ;-).
The appended patch is for pxa25x; maybe it needs to be #ifdeffed.
- Dave
============== CUT HERE
This updates the SA-1100/PXA RTC support:
- For PXA, copy the sa1100 irqchip set_wake handler; now this RTC
should be a wakeup event source. (GPIOs still not supported,
and the comment is correct for pxa2[156]x not pxa27x.)
- For both PXA and SA1100, mark the RTC platform device as capable
of being a system wakeup event source before registration.
- Bugfix the (shared) RTC driver to properly manage wakeup irqs, by
adding new suspend/resume methods. The previous code was deeply
broken, and would generate error messages from the genirq framework.
- Bugfix the (shared) RTC driver to handle the rtc_wkalrm.enable flag
properly, reporting it when the alarm is read and setting it as
requested when the alarm is set.
- Add a missing MODULE_ALIAS so this driver can hotplug; "rtc-sa1100.c"
would normally hold a driver named "rtc-sa1100", not "sa1100-rtc".
Compile-tested.
Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
---
arch/arm/mach-pxa/generic.c | 2 ++
arch/arm/mach-pxa/irq.c | 16 ++++++++++++++++
arch/arm/mach-sa1100/generic.c | 2 ++
drivers/rtc/rtc-sa1100.c | 31 ++++++++++++++++++++++++++-----
4 files changed, 46 insertions(+), 5 deletions(-)
Index: at91/arch/arm/mach-pxa/irq.c
===================================================================
--- at91.orig/arch/arm/mach-pxa/irq.c 2006-12-07 21:22:59.000000000 -0800
+++ at91/arch/arm/mach-pxa/irq.c 2006-12-19 00:33:06.000000000 -0800
@@ -39,11 +39,27 @@ static void pxa_unmask_low_irq(unsigned
ICMR |= (1 << (irq + PXA_IRQ_SKIP));
}
+/*
+ * Apart from GPIOs 0-15, only the RTC alarm can be a wakeup event.
+ */
+static int pxa_set_wake(unsigned int irq, unsigned int on)
+{
+ if (irq == IRQ_RTCAlrm) {
+ if (on)
+ PWER |= PWER_RTC;
+ else
+ PWER &= ~PWER_RTC;
+ return 0;
+ }
+ return -EINVAL;
+}
+
static struct irq_chip pxa_internal_chip_low = {
.name = "SC",
.ack = pxa_mask_low_irq,
.mask = pxa_mask_low_irq,
.unmask = pxa_unmask_low_irq,
+ .set_wake = pxa_set_wake,
};
#if PXA_INTERNAL_IRQS > 32
Index: at91/arch/arm/mach-pxa/generic.c
===================================================================
--- at91.orig/arch/arm/mach-pxa/generic.c 2006-12-07 21:22:59.000000000 -0800
+++ at91/arch/arm/mach-pxa/generic.c 2006-12-19 00:34:21.000000000 -0800
@@ -398,6 +398,8 @@ static int __init pxa_init(void)
{
int cpuid, ret;
+ device_init_wakeup(&pxartc_device.dev, 1);
+
ret = platform_add_devices(devices, ARRAY_SIZE(devices));
if (ret)
return ret;
Index: at91/arch/arm/mach-sa1100/generic.c
===================================================================
--- at91.orig/arch/arm/mach-sa1100/generic.c 2006-12-07 21:23:00.000000000 -0800
+++ at91/arch/arm/mach-sa1100/generic.c 2006-12-19 00:25:21.000000000 -0800
@@ -354,6 +354,8 @@ static int __init sa1100_init(void)
if (sa11x0ir_device.dev.platform_data)
platform_device_register(&sa11x0ir_device);
+ device_init_wakeup(&sa11x0rtc_device.dev, 1);
+
return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
}
Index: at91/drivers/rtc/rtc-sa1100.c
===================================================================
--- at91.orig/drivers/rtc/rtc-sa1100.c 2006-12-18 23:32:22.000000000 -0800
+++ at91/drivers/rtc/rtc-sa1100.c 2006-12-19 00:09:46.000000000 -0800
@@ -263,8 +263,12 @@ static int sa1100_rtc_set_time(struct de
static int sa1100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
+ u32 rtsr;
+
memcpy(&alrm->time, &rtc_alarm, sizeof(struct rtc_time));
- alrm->pending = RTSR & RTSR_AL ? 1 : 0;
+ rtsr = RTSR;
+ alrm->enabled = (rtsr & RTSR_ALE) ? 1 : 0;
+ alrm->pending = (rtsr & RTSR_AL) ? 1 : 0;
return 0;
}
@@ -275,12 +279,10 @@ static int sa1100_rtc_set_alarm(struct d
spin_lock_irq(&sa1100_rtc_lock);
ret = rtc_update_alarm(&alrm->time);
if (ret == 0) {
- memcpy(&rtc_alarm, &alrm->time, sizeof(struct rtc_time));
-
if (alrm->enabled)
- enable_irq_wake(IRQ_RTCAlrm);
+ RTSR |= RTSR_ALE;
else
- disable_irq_wake(IRQ_RTCAlrm);
+ RTSR &= ~RTSR_ALE;
}
spin_unlock_irq(&sa1100_rtc_lock);
@@ -350,9 +352,28 @@ static int sa1100_rtc_remove(struct plat
return 0;
}
+static int sa1100_rtc_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+ if (device_may_wakeup(&pdev->dev))
+ enable_irq_wake(IRQ_RTCAlrm);
+ return 0;
+}
+
+static int sa1100_rtc_resume(struct platform_device *pdev)
+{
+ if (device_may_wakeup(&pdev->dev))
+ disable_irq_wake(IRQ_RTCAlrm);
+ return 0;
+}
+
+/* alias needed so hotplug behaves ("modprobe $MODALIAS") */
+MODULE_ALIAS("sa1100-rtc");
+
static struct platform_driver sa1100_rtc_driver = {
.probe = sa1100_rtc_probe,
.remove = sa1100_rtc_remove,
+ .suspend = sa1100_rtc_suspend,
+ .resume = sa1100_rtc_resume,
.driver = {
.name = "sa1100-rtc",
},
-
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