From: Huacai Chen <chenhuacai@gmail.com>
To: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Huacai Chen <chenhuacai@loongson.cn>,
Arnd Bergmann <arnd@arndb.de>, Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Airlie <airlied@linux.ie>, Jonathan Corbet <corbet@lwn.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-arch <linux-arch@vger.kernel.org>,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Xuefeng Li <lixuefeng@loongson.cn>,
Yanteng Si <siyanteng@loongson.cn>, Guo Ren <guoren@kernel.org>,
Xuerui Wang <kernel@xen0n.name>,
Jiaxun Yang <jiaxun.yang@flygoat.com>,
Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: [PATCH V10 16/22] LoongArch: Add misc common routines
Date: Sat, 14 May 2022 22:12:37 +0800 [thread overview]
Message-ID: <CAAhV-H7_a4hUoDV+FLjf9PXuHjxRa8BokjCFAGFfirgAPfGuqw@mail.gmail.com> (raw)
In-Reply-To: <Yn+nAFCA/+Wm+rC/@mail.local>
Hi, Alexandre,
On Sat, May 14, 2022 at 8:56 PM Alexandre Belloni
<alexandre.belloni@bootlin.com> wrote:
>
> Hi,
>
> On 14/05/2022 16:03:56+0800, Huacai Chen wrote:
> > diff --git a/arch/loongarch/kernel/rtc.c b/arch/loongarch/kernel/rtc.c
> > new file mode 100644
> > index 000000000000..d7568385219f
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/rtc.c
> > @@ -0,0 +1,36 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +
> > +#include <linux/init.h>
> > +#include <linux/kernel.h>
> > +#include <linux/platform_device.h>
> > +#include <asm/loongson.h>
> > +
> > +#define RTC_TOYREAD0 0x2C
> > +#define RTC_YEAR 0x30
> > +
> > +unsigned long loongson_get_rtc_time(void)
> > +{
> > + unsigned int year, mon, day, hour, min, sec;
> > + unsigned int value;
> > +
> > + value = ls7a_readl(LS7A_RTC_REG_BASE + RTC_TOYREAD0);
> > + sec = (value >> 4) & 0x3f;
> > + min = (value >> 10) & 0x3f;
> > + hour = (value >> 16) & 0x1f;
> > + day = (value >> 21) & 0x1f;
> > + mon = (value >> 26) & 0x3f;
> > + year = ls7a_readl(LS7A_RTC_REG_BASE + RTC_YEAR);
> > +
> > + year = 1900 + year;
> > +
> > + return mktime64(year, mon, day, hour, min, sec);
> > +}
> > +
> > +void read_persistent_clock64(struct timespec64 *ts)
> > +{
>
> This should rather be implemented in a proper rtc driver and then have
> userspace set the system time or use hctosys.
I found that some archs don't implement read_persistent_clock64(), so
I can safely remove the whole file if there is available rtc drivers?
Huacai
>
> > + ts->tv_sec = loongson_get_rtc_time();
> > + ts->tv_nsec = 0;
> > +}
> > --
> > 2.27.0
> >
>
> --
> Alexandre Belloni, co-owner and COO, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
next prev parent reply other threads:[~2022-05-14 14:13 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-14 8:03 [PATCH V10 00/22] arch: Add basic LoongArch support Huacai Chen
2022-05-14 8:03 ` [PATCH V10 01/22] Documentation: LoongArch: Add basic documentations Huacai Chen
2022-05-14 13:11 ` WANG Xuerui
2022-05-14 15:40 ` Huacai Chen
2022-05-15 12:41 ` Bagas Sanjaya
2022-05-15 13:14 ` Huacai Chen
2022-05-14 8:03 ` [PATCH V10 02/22] Documentation/zh_CN: Add basic LoongArch documentations Huacai Chen
2022-05-14 13:26 ` WANG Xuerui
2022-05-14 14:49 ` Huacai Chen
2022-05-15 14:14 ` Wu X.C.
2022-05-14 8:03 ` [PATCH V3 03/22] LoongArch: Add elf-related definitions Huacai Chen
2022-05-14 13:29 ` WANG Xuerui
2022-05-14 14:11 ` Huacai Chen
2022-05-15 4:13 ` WANG Xuerui
2022-05-15 11:47 ` Huacai Chen
2022-05-14 8:03 ` [PATCH V10 04/22] LoongArch: Add writecombine support for drm Huacai Chen
2022-05-15 4:18 ` WANG Xuerui
2022-05-15 11:50 ` Huacai Chen
2022-05-14 8:03 ` [PATCH V10 05/22] LoongArch: Add build infrastructure Huacai Chen
2022-05-14 13:38 ` WANG Xuerui
2022-05-14 8:03 ` [PATCH V10 06/22] LoongArch: Add CPU definition headers Huacai Chen
2022-05-14 8:03 ` [PATCH V10 07/22] LoongArch: Add atomic/locking headers Huacai Chen
2022-05-14 8:03 ` [PATCH V10 08/22] LoongArch: Add other common headers Huacai Chen
2022-05-15 0:01 ` Jason A. Donenfeld
2022-05-15 11:42 ` Huacai Chen
2022-05-14 8:03 ` [PATCH V10 09/22] LoongArch: Add boot and setup routines Huacai Chen
2022-05-15 8:44 ` WANG Xuerui
2022-05-15 12:38 ` Huacai Chen
2022-05-16 2:41 ` WANG Xuerui
2022-05-14 8:03 ` [PATCH V10 10/22] LoongArch: Add exception/interrupt handling Huacai Chen
2022-05-15 9:07 ` WANG Xuerui
2022-05-15 13:00 ` Huacai Chen
2022-05-14 8:03 ` [PATCH V10 11/22] LoongArch: Add process management Huacai Chen
2022-05-15 9:20 ` WANG Xuerui
2022-05-15 13:25 ` Huacai Chen
2022-05-14 8:03 ` [PATCH V10 12/22] LoongArch: Add memory management Huacai Chen
2022-05-15 9:42 ` WANG Xuerui
2022-05-15 13:38 ` Huacai Chen
2022-05-14 8:03 ` [PATCH V10 13/22] LoongArch: Add system call support Huacai Chen
2022-05-14 13:53 ` WANG Xuerui
2022-05-14 14:39 ` Huacai Chen
2022-05-15 9:47 ` WANG Xuerui
2022-05-14 8:03 ` [PATCH V10 14/22] LoongArch: Add signal handling support Huacai Chen
2022-05-15 10:39 ` WANG Xuerui
2022-05-15 13:48 ` Huacai Chen
2022-05-16 3:51 ` WANG Xuerui
[not found] ` <87bkvxd12b.fsf@email.froward.int.ebiederm.org>
2022-05-16 15:02 ` WANG Xuerui
2022-05-17 2:08 ` Huacai Chen
2022-05-17 15:36 ` Eric W. Biederman
2022-05-14 8:03 ` [PATCH V10 15/22] LoongArch: Add ELF and module support Huacai Chen
2022-05-15 11:03 ` WANG Xuerui
2022-05-15 14:13 ` Huacai Chen
2022-05-14 8:03 ` [PATCH V10 16/22] LoongArch: Add misc common routines Huacai Chen
2022-05-14 12:56 ` Alexandre Belloni
2022-05-14 14:12 ` Huacai Chen [this message]
2022-05-14 16:00 ` Alexandre Belloni
2022-05-15 13:03 ` WANG Xuerui
2022-05-15 14:21 ` Huacai Chen
2022-05-14 8:03 ` [PATCH V10 17/22] LoongArch: Add some library functions Huacai Chen
2022-05-15 13:11 ` WANG Xuerui
2022-05-15 14:27 ` Huacai Chen
2022-05-14 8:03 ` [PATCH V10 18/22] LoongArch: Add PCI controller support Huacai Chen
2022-05-15 13:35 ` WANG Xuerui
2022-05-14 8:03 ` [PATCH V10 19/22] LoongArch: Add VDSO and VSYSCALL support Huacai Chen
2022-05-15 14:47 ` WANG Xuerui
2022-05-15 14:52 ` Huacai Chen
2022-05-14 8:04 ` [PATCH V10 20/22] LoongArch: Add multi-processor (SMP) support Huacai Chen
2022-05-15 14:16 ` WANG Xuerui
2022-05-15 14:47 ` Huacai Chen
2022-05-14 8:04 ` [PATCH V10 21/22] LoongArch: Add Non-Uniform Memory Access (NUMA) support Huacai Chen
2022-05-15 14:27 ` WANG Xuerui
2022-05-15 14:49 ` Huacai Chen
2022-05-14 8:04 ` [PATCH V10 22/22] LoongArch: Add Loongson-3 default config file Huacai Chen
2022-05-15 14:30 ` WANG Xuerui
2022-05-14 20:54 ` [PATCH V10 00/22] arch: Add basic LoongArch support Arnd Bergmann
2022-05-16 7:41 ` Huacai Chen
2022-05-15 15:09 ` WANG Xuerui
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAAhV-H7_a4hUoDV+FLjf9PXuHjxRa8BokjCFAGFfirgAPfGuqw@mail.gmail.com \
--to=chenhuacai@gmail.com \
--cc=airlied@linux.ie \
--cc=akpm@linux-foundation.org \
--cc=alexandre.belloni@bootlin.com \
--cc=arnd@arndb.de \
--cc=chenhuacai@loongson.cn \
--cc=corbet@lwn.net \
--cc=guoren@kernel.org \
--cc=jiaxun.yang@flygoat.com \
--cc=kernel@xen0n.name \
--cc=linux-arch@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lixuefeng@loongson.cn \
--cc=luto@kernel.org \
--cc=peterz@infradead.org \
--cc=sfr@canb.auug.org.au \
--cc=siyanteng@loongson.cn \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).