Re: aranym /dev/rtc
Going back into time...
On Mon, 27 Apr 2009, Geert Uytterhoeven wrote:
> 4. CONFIG_RTC_CLASS=y, CONFIG_RTC_DRV_CMOS=[my], /dev/rtc is dynamic
> While rtc-cmos can be enabled on Atari (it was derived from
> rtc.c), it won't work yet,
> as the necessary rtc_cmos platform device is not yet created on Atari.
I gave it a try, cfr. "[PATCH 1/2] [RFC] m68k/atari: Create rtc_cmos platform
device" below.
Unfortunately it didn't work well, cfr. "[PATCH 2/2] [RFC] rtc: Disable
RTC_DRV_CMOS on Atari" below, while rtc-generic works fine for the RTC part,
and the separate nvram driver works for the NVRAM part.
So unless someone has a good reason for using rtc_cmos (and some patches
to fix its issues), I'll go for [PATCH 2/2].
Thanks for your feedback!
>From 454783a49347468b5ddf5a01e00aa5b1b66d2480 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Mon, 2 Dec 2013 11:08:13 +0100
Subject: [PATCH 1/2] [RFC] m68k/atari: Create rtc_cmos platform device
Create an "rtc_cmos" platform device, so rtc-cmos can be used on Atari.
Its IRQ is available on systems with a TT_MFP only.
This requires renaming RTC_PORT(), as rtc-cmos uses the presence of this
macro to enable support for the second NVRAM bank, which Atari doesn't
have ("Unable to handle kernel access at virtual address 00ff8965").
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
arch/m68k/atari/config.c | 26 ++++++++++++++++++++++++++
arch/m68k/include/asm/mc146818rtc.h | 10 +++++-----
2 files changed, 31 insertions(+), 5 deletions(-)
diff --git a/arch/m68k/atari/config.c b/arch/m68k/atari/config.c
index 01a62161b08a..59704b127146 100644
--- a/arch/m68k/atari/config.c
+++ b/arch/m68k/atari/config.c
@@ -660,6 +660,26 @@ static void atari_get_hardware_list(struct seq_file *m)
ATARIHW_ANNOUNCE(DSP56K, "DSP56001 processor");
}
+static struct resource rtc_resources[] = {
+ [0] = {
+ .start = TT_RTC_BAS,
+ .end = TT_RTC_BAS + 2 * 2 - 1,
+ .flags = IORESOURCE_IO,
+ },
+ [1] = {
+ .start = IRQ_TT_MFP_RTC,
+ .end = IRQ_TT_MFP_RTC,
+ .flags = IORESOURCE_IRQ,
+ }
+};
+
+static struct platform_device rtc_device = {
+ .name = "rtc_cmos",
+ .id = -1,
+ .resource = rtc_resources,
+ .num_resources = 1 /* Default to no IRQ */
+};
+
/*
* MSch: initial platform device support for Atari,
* required for EtherNAT/EtherNEC/NetUSBee drivers
@@ -865,6 +885,12 @@ int __init atari_platform_init(void)
if (!MACH_IS_ATARI)
return -ENODEV;
+ if (ATARIHW_PRESENT(TT_MFP)) {
+ /* Enable IRQ resource */
+ rtc_device.num_resources = 2;
+ }
+ platform_device_register(&rtc_device);
+
#ifdef CONFIG_ATARI_ETHERNAT
{
unsigned char *enatc_virt;
diff --git a/arch/m68k/include/asm/mc146818rtc.h b/arch/m68k/include/asm/mc146818rtc.h
index 9f70a01f73dc..05b43bf5cdf3 100644
--- a/arch/m68k/include/asm/mc146818rtc.h
+++ b/arch/m68k/include/asm/mc146818rtc.h
@@ -10,16 +10,16 @@
#include <asm/atarihw.h>
-#define RTC_PORT(x) (TT_RTC_BAS + 2*(x))
+#define ATARI_RTC_PORT(x) (TT_RTC_BAS + 2*(x))
#define RTC_ALWAYS_BCD 0
#define CMOS_READ(addr) ({ \
-atari_outb_p((addr),RTC_PORT(0)); \
-atari_inb_p(RTC_PORT(1)); \
+atari_outb_p((addr), ATARI_RTC_PORT(0)); \
+atari_inb_p(ATARI_RTC_PORT(1)); \
})
#define CMOS_WRITE(val, addr) ({ \
-atari_outb_p((addr),RTC_PORT(0)); \
-atari_outb_p((val),RTC_PORT(1)); \
+atari_outb_p((addr), ATARI_RTC_PORT(0)); \
+atari_outb_p((val), ATARI_RTC_PORT(1)); \
})
#endif /* CONFIG_ATARI */
--
1.7.9.5
>From 6c81cebe1f9bcf5fecae689235e86b42c9f8e28c Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Mon, 2 Dec 2013 11:12:23 +0100
Subject: [PATCH 2/2] [RFC] rtc: Disable RTC_DRV_CMOS on Atari
On ARAnyM (emulating an Atari Falcon, which doesn't have an RTC IRQ),
rtc-cmos doesn't work well:
- The date is of by 32 years (2045 instead of 2013):
rtc_cmos rtc_cmos: setting system clock to 2045-12-02 10:56:17 UTC (2395824977)
- The hwclock utility doesn't work:
hwclock: ioctl() to /dev/rtc to turn on update interrupts failed unexpectedly, errno=5: Input/output error.
rtc-generic works fine for the RTC part, and nvram works for the NVRAM part,
though.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
drivers/rtc/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 007730222116..f1d7e974a700 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -626,7 +626,7 @@ comment "Platform RTC drivers"
config RTC_DRV_CMOS
tristate "PC-style 'CMOS'"
- depends on X86 || ARM || M32R || ATARI || PPC || MIPS || SPARC64
+ depends on X86 || ARM || M32R || PPC || MIPS || SPARC64
default y if X86
help
Say "yes" here to get direct support for the real time clock
--
1.7.9.5
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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