2019-05-19 21:51:34 +08:00
|
|
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
2011-07-08 17:40:12 +08:00
|
|
|
/*
|
|
|
|
|
* This file contains common function prototypes to avoid externs in the c files.
|
|
|
|
|
*
|
|
|
|
|
* Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#ifndef __MACH_PRIMA2_COMMON_H__
|
|
|
|
|
#define __MACH_PRIMA2_COMMON_H__
|
|
|
|
|
|
|
|
|
|
#include <linux/init.h>
|
2013-07-09 07:01:40 +08:00
|
|
|
#include <linux/reboot.h>
|
|
|
|
|
|
2011-07-08 17:40:12 +08:00
|
|
|
#include <asm/mach/time.h>
|
2012-12-20 19:11:18 +08:00
|
|
|
#include <asm/exception.h>
|
2011-07-08 17:40:12 +08:00
|
|
|
|
ARM: smp: remove arch-provided "pen_release"
Consolidating the "pen_release" stuff amongst the various SoC
implementations gives credence to having a CPU holding pen for
secondary CPUs. However, this is far from the truth.
Many SoC implementations cargo-cult copied various bits of the pen
release implementation from the initial Realview/Versatile Express
implementation without understanding what it was or why it existed.
The reason it existed is because these are _development_ platforms,
and some board firmware is unable to individually control the
startup of secondary CPUs. Moreover, they do not have a way to
power down or reset secondary CPUs for hot-unplug. Hence, the
pen_release implementation was designed for ARM Ltd's development
platforms to provide a working implementation, even though it is
very far from what is required.
It was decided a while back to reduce the duplication by consolidating
the "pen_release" variable, but this only made the situation worse -
we have ended up with several implementations that read this variable
but do not write it - again, showing the cargo-cult mentality at work,
lack of proper review of new code, and in some cases a lack of testing.
While it would be preferable to remove pen_release entirely from the
kernel, this is not possible without help from the SoC maintainers,
which seems to be lacking. However, I want to remove pen_release from
arch code to remove the credence that having it gives.
This patch removes pen_release from the arch code entirely, adding
private per-SoC definitions for it instead, and explicitly stating
that write_pen_release() is cargo-cult copied and should not be
copied any further. Rename write_pen_release() in a similar fashion
as well.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
2018-12-13 22:02:48 +08:00
|
|
|
extern volatile int prima2_pen_release;
|
|
|
|
|
|
2015-11-15 09:39:53 +08:00
|
|
|
extern const struct smp_operations sirfsoc_smp_ops;
|
2012-12-20 19:37:32 +08:00
|
|
|
extern void sirfsoc_secondary_startup(void);
|
|
|
|
|
extern void sirfsoc_cpu_die(unsigned int cpu);
|
2011-07-08 17:40:12 +08:00
|
|
|
|
|
|
|
|
extern void __init sirfsoc_of_irq_init(void);
|
2012-12-20 19:11:18 +08:00
|
|
|
extern asmlinkage void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs);
|
2011-07-08 17:40:12 +08:00
|
|
|
|
2012-04-26 20:51:36 +08:00
|
|
|
#ifdef CONFIG_SUSPEND
|
|
|
|
|
extern int sirfsoc_pm_init(void);
|
|
|
|
|
#else
|
|
|
|
|
static inline int sirfsoc_pm_init(void) { return 0; }
|
|
|
|
|
#endif
|
|
|
|
|
|
2011-07-08 17:40:12 +08:00
|
|
|
#endif
|