2018-06-14 09:56:06 +08:00
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// SPDX-License-Identifier: GPL-2.0
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2012-01-10 16:44:39 +08:00
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/*
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* SMP support for R-Mobile / SH-Mobile - r8a7779 portion
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*
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* Copyright (C) 2011 Renesas Solutions Corp.
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* Copyright (C) 2011 Magnus Damm
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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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2016-04-20 20:02:36 +08:00
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#include <linux/soc/renesas/rcar-sysc.h>
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2014-06-21 00:53:05 +08:00
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2013-02-18 21:47:25 +08:00
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#include <asm/cacheflush.h>
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2012-01-20 19:01:12 +08:00
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#include <asm/smp_plat.h>
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2012-01-10 16:44:39 +08:00
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#include <asm/smp_scu.h>
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2014-06-21 00:53:05 +08:00
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2014-06-17 15:47:37 +08:00
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#include "common.h"
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2014-06-21 00:53:05 +08:00
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#include "r8a7779.h"
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2012-01-10 16:44:39 +08:00
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2012-03-10 07:16:40 +08:00
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#define AVECR IOMEM(0xfe700040)
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2013-02-18 21:47:16 +08:00
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#define R8A7779_SCU_BASE 0xf0000000
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2013-02-13 21:46:48 +08:00
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2013-06-18 03:43:14 +08:00
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static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
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2012-01-10 16:44:39 +08:00
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{
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2018-05-30 23:25:14 +08:00
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int ret = -EIO;
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2012-01-10 16:44:39 +08:00
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2018-05-30 23:25:14 +08:00
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cpu = cpu_logical_map(cpu);
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if (cpu)
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ret = rcar_sysc_power_up_cpu(cpu);
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2012-01-10 16:44:39 +08:00
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return ret;
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}
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2011-09-08 20:15:22 +08:00
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static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
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2012-01-10 16:44:39 +08:00
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{
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2013-06-10 17:19:56 +08:00
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/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
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__raw_writel(__pa(shmobile_boot_vector), AVECR);
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2012-01-10 16:44:39 +08:00
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2013-07-31 15:07:31 +08:00
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/* setup r8a7779 specific SCU bits */
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ARM: shmobile: Consolidate SCU mapping code
Currently the SCU registers are mapped in SoC-specific code, using
different methods, all involving the static mapping set up from
machine_desc.map_io():
- On emev2, a static (non-identity) mapping is used, with ioremap().
As the static mapping uses the MT_DEVICE type, ioremap() reuses it,
and the returned virtual address is suitable for passing to
shmobile_smp_hook(),
- On sh73a0 and r8a7779, a static identity mapping is used, with the
legacy IOMEM() macro.
As the static mapping uses the MT_DEVICE_NONSHARED type, replacing
IOMEM() by ioremap() would create a new mapping, whose virtual
address cannot be passed to shmobile_smp_hook().
Move the mapping of the SCU registers from SoC-specific code to common
code, always using ioremap(). To work in the absence of a static
mapping, this requires passing the physical SCU base address to
shmobile_smp_hook().
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
2016-01-28 23:13:32 +08:00
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shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
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2012-01-10 16:44:39 +08:00
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}
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2011-09-08 20:15:22 +08:00
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2013-02-18 21:47:54 +08:00
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#ifdef CONFIG_HOTPLUG_CPU
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2018-07-06 23:15:19 +08:00
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static int r8a7779_platform_cpu_kill(unsigned int cpu)
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{
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int ret = -EIO;
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cpu = cpu_logical_map(cpu);
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if (cpu)
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ret = rcar_sysc_power_down_cpu(cpu);
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return ret ? ret : 1;
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}
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2013-02-18 21:47:54 +08:00
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static int r8a7779_cpu_kill(unsigned int cpu)
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{
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2013-07-31 15:08:09 +08:00
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if (shmobile_smp_scu_cpu_kill(cpu))
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return r8a7779_platform_cpu_kill(cpu);
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2013-02-18 21:47:54 +08:00
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return 0;
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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2015-11-15 09:39:53 +08:00
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const struct smp_operations r8a7779_smp_ops __initconst = {
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2011-09-08 20:15:22 +08:00
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.smp_prepare_cpus = r8a7779_smp_prepare_cpus,
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.smp_boot_secondary = r8a7779_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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2013-07-31 15:08:09 +08:00
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.cpu_die = shmobile_smp_scu_cpu_die,
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.cpu_kill = r8a7779_cpu_kill,
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2011-09-08 20:15:22 +08:00
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#endif
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};
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