2012-04-19 16:53:13 +00:00
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/*
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2013-03-12 16:00:03 +00:00
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* spear machine family generic header file
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2012-04-19 16:53:13 +00:00
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*
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2013-03-12 16:00:03 +00:00
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* Copyright (C) 2009-2012 ST Microelectronics
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* Rajeev Kumar <rajeev-dlh.kumar@st.com>
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2015-07-17 23:23:50 +00:00
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* Viresh Kumar <vireshk@kernel.org>
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2012-04-19 16:53:13 +00:00
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#ifndef __MACH_GENERIC_H
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#define __MACH_GENERIC_H
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#include <linux/dmaengine.h>
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2013-03-12 16:00:03 +00:00
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#include <linux/amba/pl08x.h>
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#include <linux/init.h>
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2013-07-08 23:01:40 +00:00
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#include <linux/reboot.h>
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2012-04-19 16:53:13 +00:00
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#include <asm/mach/time.h>
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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 14:02:48 +00:00
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extern volatile int spear_pen_release;
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2012-11-08 19:40:59 +00:00
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extern void spear13xx_timer_init(void);
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2013-03-12 16:00:03 +00:00
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extern void spear3xx_timer_init(void);
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2012-04-19 16:53:13 +00:00
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extern struct pl022_ssp_controller pl022_plat_data;
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2013-03-12 16:00:03 +00:00
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extern struct pl08x_platform_data pl080_plat_data;
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2012-04-19 16:53:13 +00:00
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void __init spear_setup_of_timer(void);
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2012-12-02 16:59:57 +00:00
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void __init spear3xx_clk_init(void __iomem *misc_base,
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void __iomem *soc_config_base);
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2013-03-12 16:00:03 +00:00
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void __init spear3xx_map_io(void);
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void __init spear3xx_dt_init_irq(void);
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2012-12-02 16:59:57 +00:00
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void __init spear6xx_clk_init(void __iomem *misc_base);
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2012-04-19 16:53:13 +00:00
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void __init spear13xx_map_io(void);
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void __init spear13xx_l2x0_init(void);
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2013-03-12 16:00:03 +00:00
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2013-07-08 23:01:40 +00:00
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void spear_restart(enum reboot_mode, const char *);
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2013-03-12 16:00:03 +00:00
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2012-04-19 16:53:13 +00:00
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void spear13xx_secondary_startup(void);
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2013-06-17 19:43:14 +00:00
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void spear13xx_cpu_die(unsigned int cpu);
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2011-09-08 12:15:22 +00:00
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2015-11-15 01:39:53 +00:00
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extern const struct smp_operations spear13xx_smp_ops;
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2012-04-19 16:53:13 +00:00
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#endif /* __MACH_GENERIC_H */
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