linux-toradex.git/drivers/clocksource/timer-sp804.c, branch v5.10-rc6

clocksource/drivers/sp804: Enable Hisilicon sp804 timer 64bit mode

2020-09-24T08:51:04+00:00

A 100MHZ 32-bit timer will be wrapped up less than 43s. Although the
kernel maintains a software high 32-bit count in the tick IRQ. But it's
not applicable to the user mode APPs.

Note: The kernel still uses the lower 32 bits of the timer.

Signed-off-by: Zhen Lei 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20200918132237.3552-9-thunder.leizhen@huawei.com

clocksource/drivers/sp804: Add support for Hisilicon sp804 timer

2020-09-24T08:51:04+00:00

The ARM SP804 supports a maximum of 32-bit counter, but Hisilicon extends
it to 64-bit. That means, the registers: TimerXload, TimerXValue and
TimerXBGLoad are 64bits, all other registers are the same as those in the
SP804. The driver code can be completely reused except that the register
offset is different.

Use compatible = "hisilicon,sp804" mark as Hisilicon sp804 timer.

Signed-off-by: Zhen Lei 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20200918132237.3552-8-thunder.leizhen@huawei.com

clocksource/drivers/sp804: Support non-standard register offset

2020-09-24T08:51:04+00:00

The ARM SP804 supports a maximum of 32-bit counter, but Hisilicon extends
it to 64-bit. That means, the registers: TimerXload, TimerXValue and
TimerXBGLoad are 64bits, all other registers are the same as those in the
SP804. The driver code can be completely reused except that the register
offset is different.

Currently, we get a timer register address by: add the constant register
offset to the timer base address. e.g. "base + TIMER_CTRL". It can not be
dynamically adjusted at run time.

So create a new structure "sp804_timer" to record the original registers
offset, and create a new structure "sp804_clkevt" to record the
calculated registers address. So the "base + TIMER_CTRL" is changed to
"clkevt->ctrl", this will faster than "base + timer->ctrl".

For example:
	struct sp804_timer arm_sp804_timer = {
		.ctrl	= TIMER_CTRL,
	};

	struct sp804_clkevt clkevt;

	clkevt.ctrl = base + arm_sp804_timer.ctrl.

-	writel(0, base + TIMER_CTRL);
+	writel(0, clkevt->ctrl);

Signed-off-by: Zhen Lei 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20200918132237.3552-7-thunder.leizhen@huawei.com

clocksource/drivers/sp804: Prepare for support non-standard register offset

2020-09-24T08:51:04+00:00

Add two local variables: timer1_base and timer2_base in sp804_of_init(),
to avoid repeatedly calculate the base address of timer2, and make it
easier to recognize timer1. Hope to make the next patch looks more clear.

No functional change.

Signed-off-by: Zhen Lei 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20200918132237.3552-6-thunder.leizhen@huawei.com

clocksource/drivers/sp804: Remove a mismatched comment

2020-09-24T08:51:04+00:00

writel(0, base + TIMER_CTRL);
... ...
writel(xxx | TIMER_CTRL_PERIODIC, base + TIMER_CTRL);

The timer is just temporarily disabled, and it will be set to periodic
mode later.

The description of the field TimerMode of the register TimerXControl
as shown below:
0 = Timer module is in free-running mode (default)
1 = Timer module is in periodic mode.

Signed-off-by: Zhen Lei 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20200918132237.3552-5-thunder.leizhen@huawei.com

clocksource/drivers/sp804: Delete the leading "__" of some functions

2020-09-24T08:51:04+00:00

Delete the leading "__" of __sp804_clocksource_and_sched_clock_init() and
__sp804_clockevents_init(), make it looks a little more comfortable.

Signed-off-by: Zhen Lei 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20200918132237.3552-4-thunder.leizhen@huawei.com

clocksource/drivers/sp804: Remove unused sp804_timer_disable() and timer-sp804.h

2020-09-24T08:51:04+00:00

Since commit 7484c727b636 ("ARM: realview: delete the RealView board
files") and commit 16956fed35fe ("ARM: versatile: switch to DT only
booting and remove legacy code"), there's no one to use the functions
defined or declared in include/clocksource/timer-sp804.h. Delete it.

Signed-off-by: Zhen Lei 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20200918132237.3552-3-thunder.leizhen@huawei.com

clocksource/drivers/sp804: Cleanup clk_get_sys()

2020-09-24T08:51:04+00:00

Move the clk_get_sys() part into sp804_get_clock_rate(), cleanup the same
code.

Signed-off-by: Kefeng Wang 
Signed-off-by: Zhen Lei 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/20200918132237.3552-2-thunder.leizhen@huawei.com

clocksource: Replace setup_irq() by request_irq()

2020-02-27T11:15:24+00:00

request_irq() is preferred over setup_irq(). The early boot setup_irq()
invocations happen either via 'init_IRQ()' or 'time_init()', while
memory allocators are ready by 'mm_init()'.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

Seldom remove_irq() usage has been observed coupled with setup_irq(),
wherever that has been found, it too has been replaced by free_irq().

A build error that was reported by kbuild test robot 
in the previous version of the patch also has been fixed.

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

Signed-off-by: afzal mohammed 
Signed-off-by: Daniel Lezcano 
Link: https://lore.kernel.org/r/91961c77c1cf93d41523f5e1ac52043f32f97077.1582799709.git.afzal.mohd.ma@gmail.com

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

2019-05-30T18:26:35+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Allison Randal 
Reviewed-by: Richard Fontana 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman