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// SPDX-License-Identifier: GPL-2.0
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/*
* SMP support for R - Mobile / SH - Mobile - r8a7779 portion
*
* Copyright ( C ) 2011 Renesas Solutions Corp .
* Copyright ( C ) 2011 Magnus Damm
*/
# include <linux/kernel.h>
# include <linux/init.h>
# include <linux/smp.h>
# include <linux/spinlock.h>
# include <linux/io.h>
# include <linux/delay.h>
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# include <linux/soc/renesas/rcar-sysc.h>
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# include <asm/cacheflush.h>
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# include <asm/smp_plat.h>
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# include <asm/smp_scu.h>
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# include "common.h"
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# include "r8a7779.h"
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# define HPBREG_BASE 0xfe700000
# define AVECR 0x0040 /* ARM Reset Vector Address Register */
# define R8A7779_SCU_BASE 0xf0000000
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static int r8a7779_boot_secondary ( unsigned int cpu , struct task_struct * idle )
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{
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int ret = - EIO ;
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cpu = cpu_logical_map ( cpu ) ;
if ( cpu )
ret = rcar_sysc_power_up_cpu ( cpu ) ;
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return ret ;
}
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static void __init r8a7779_smp_prepare_cpus ( unsigned int max_cpus )
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{
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void __iomem * base = ioremap ( HPBREG_BASE , 0x1000 ) ;
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/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
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writel ( __pa ( shmobile_boot_vector ) , base + AVECR ) ;
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/* setup r8a7779 specific SCU bits */
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>
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shmobile_smp_scu_prepare_cpus ( R8A7779_SCU_BASE , max_cpus ) ;
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iounmap ( base ) ;
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}
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# ifdef CONFIG_HOTPLUG_CPU
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static int r8a7779_platform_cpu_kill ( unsigned int cpu )
{
int ret = - EIO ;
cpu = cpu_logical_map ( cpu ) ;
if ( cpu )
ret = rcar_sysc_power_down_cpu ( cpu ) ;
return ret ? ret : 1 ;
}
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static int r8a7779_cpu_kill ( unsigned int cpu )
{
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if ( shmobile_smp_scu_cpu_kill ( cpu ) )
return r8a7779_platform_cpu_kill ( cpu ) ;
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return 0 ;
}
# endif /* CONFIG_HOTPLUG_CPU */
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const struct smp_operations r8a7779_smp_ops __initconst = {
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. smp_prepare_cpus = r8a7779_smp_prepare_cpus ,
. smp_boot_secondary = r8a7779_boot_secondary ,
# ifdef CONFIG_HOTPLUG_CPU
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. cpu_die = shmobile_smp_scu_cpu_die ,
. cpu_kill = r8a7779_cpu_kill ,
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# endif
} ;