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8bd26e3a7e
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings. In any case, they are temporary and harmless.
This removes all the ARM uses of the __cpuinit macros from C code,
and all __CPUINIT from assembly code. It also had two ".previous"
section statements that were paired off against __CPUINIT
(aka .section ".cpuinit.text") that also get removed here.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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* SMP support for R-Mobile / SH-Mobile - sh73a0 portion
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*
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* Copyright (C) 2010 Magnus Damm
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* Copyright (C) 2010 Takashi Yoshii
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <mach/common.h>
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#include <asm/cacheflush.h>
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#include <asm/smp_plat.h>
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#include <mach/sh73a0.h>
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#include <asm/smp_scu.h>
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#include <asm/smp_twd.h>
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#define WUPCR IOMEM(0xe6151010)
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#define SRESCR IOMEM(0xe6151018)
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#define PSTR IOMEM(0xe6151040)
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#define SBAR IOMEM(0xe6180020)
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#define APARMBAREA IOMEM(0xe6f10020)
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#define PSTR_SHUTDOWN_MODE 3
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#define SH73A0_SCU_BASE 0xf0000000
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#ifdef CONFIG_HAVE_ARM_TWD
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static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, SH73A0_SCU_BASE + 0x600, 29);
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void __init sh73a0_register_twd(void)
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{
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twd_local_timer_register(&twd_local_timer);
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}
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#endif
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static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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cpu = cpu_logical_map(cpu);
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if (((__raw_readl(PSTR) >> (4 * cpu)) & 3) == 3)
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__raw_writel(1 << cpu, WUPCR); /* wake up */
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else
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__raw_writel(1 << cpu, SRESCR); /* reset */
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return 0;
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}
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static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
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{
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scu_enable(shmobile_scu_base);
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/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
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__raw_writel(0, APARMBAREA); /* 4k */
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__raw_writel(__pa(shmobile_boot_vector), SBAR);
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shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
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shmobile_boot_arg = (unsigned long)shmobile_scu_base;
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/* enable cache coherency on booting CPU */
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scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
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}
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static void __init sh73a0_smp_init_cpus(void)
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{
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/* setup sh73a0 specific SCU base */
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shmobile_scu_base = IOMEM(SH73A0_SCU_BASE);
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shmobile_smp_init_cpus(scu_get_core_count(shmobile_scu_base));
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static int sh73a0_cpu_kill(unsigned int cpu)
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{
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int k;
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u32 pstr;
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/*
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* wait until the power status register confirms the shutdown of the
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* offline target
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*/
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for (k = 0; k < 1000; k++) {
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pstr = (__raw_readl(PSTR) >> (4 * cpu)) & 3;
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if (pstr == PSTR_SHUTDOWN_MODE)
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return 1;
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mdelay(1);
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}
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return 0;
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}
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static void sh73a0_cpu_die(unsigned int cpu)
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{
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/* Set power off mode. This takes the CPU out of the MP cluster */
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scu_power_mode(shmobile_scu_base, SCU_PM_POWEROFF);
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/* Enter shutdown mode */
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cpu_do_idle();
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}
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static int sh73a0_cpu_disable(unsigned int cpu)
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{
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return 0; /* CPU0 and CPU1 supported */
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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struct smp_operations sh73a0_smp_ops __initdata = {
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.smp_init_cpus = sh73a0_smp_init_cpus,
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.smp_prepare_cpus = sh73a0_smp_prepare_cpus,
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.smp_boot_secondary = sh73a0_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_kill = sh73a0_cpu_kill,
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.cpu_die = sh73a0_cpu_die,
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.cpu_disable = sh73a0_cpu_disable,
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#endif
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};
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