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ARM: shmobile: r8a7791 SMP support

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Tie in the APMU SMP code on r8a7791. When used together
with the secondary CPU device node and smp_ops in the
board specific code then this will allow use of the
two Cortex-A15 cores in the r8a7791 SoC.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Magnus Damm 2013-10-01 17:13:16 +09:00 committed by Simon Horman
parent 31e4e292f8
commit 687c27b070
4 changed files with 65 additions and 0 deletions
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1
arch/arm/mach-shmobile/Makefile
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@ -40,6 +40,7 @@ smp-y := platsmp.o headsmp.o
smp-$(CONFIG_ARCH_SH73A0) += smp-sh73a0.o headsmp-scu.o platsmp-scu.o
smp-$(CONFIG_ARCH_R8A7779) += smp-r8a7779.o headsmp-scu.o platsmp-scu.o
smp-$(CONFIG_ARCH_R8A7790) += smp-r8a7790.o platsmp-apmu.o
smp-$(CONFIG_ARCH_R8A7791) += smp-r8a7791.o platsmp-apmu.o
smp-$(CONFIG_ARCH_EMEV2) += smp-emev2.o headsmp-scu.o platsmp-scu.o
# IRQ objects

1
arch/arm/mach-shmobile/include/mach/r8a7791.h
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@ -5,5 +5,6 @@ void r8a7791_add_standard_devices(void);
void r8a7791_add_dt_devices(void);
void r8a7791_clock_init(void);
void r8a7791_init_early(void);
extern struct smp_operations r8a7791_smp_ops;
#endif /* __ASM_R8A7791_H__ */

1
arch/arm/mach-shmobile/setup-r8a7791.c
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@ -176,6 +176,7 @@ static const char *r8a7791_boards_compat_dt[] __initdata = {
};
DT_MACHINE_START(R8A7791_DT, "Generic R8A7791 (Flattened Device Tree)")
.smp = smp_ops(r8a7791_smp_ops),
.init_early = r8a7791_init_early,
.init_time = rcar_gen2_timer_init,
.dt_compat = r8a7791_boards_compat_dt,

62
arch/arm/mach-shmobile/smp-r8a7791.c Normal file
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@ -0,0 +1,62 @@
/*
* SMP support for r8a7791
*
* Copyright (C) 2013 Renesas Solutions Corp.
* Copyright (C) 2013 Magnus Damm
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <asm/smp_plat.h>
#include <mach/common.h>
#include <mach/r8a7791.h>
#define RST 0xe6160000
#define CA15BAR 0x0020
#define CA15RESCNT 0x0040
#define RAM 0xe6300000
static void __init r8a7791_smp_prepare_cpus(unsigned int max_cpus)
{
void __iomem *p;
u32 bar;
/* let APMU code install data related to shmobile_boot_vector */
shmobile_smp_apmu_prepare_cpus(max_cpus);
/* RAM for jump stub, because BAR requires 256KB aligned address */
p = ioremap_nocache(RAM, shmobile_boot_size);
memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
iounmap(p);
/* setup reset vectors */
p = ioremap_nocache(RST, 0x63);
bar = (RAM >> 8) & 0xfffffc00;
writel_relaxed(bar, p + CA15BAR);
writel_relaxed(bar | 0x10, p + CA15BAR);
/* enable clocks to all CPUs */
writel_relaxed((readl_relaxed(p + CA15RESCNT) & ~0x0f) | 0xa5a50000,
p + CA15RESCNT);
iounmap(p);
}
struct smp_operations r8a7791_smp_ops __initdata = {
.smp_prepare_cpus = r8a7791_smp_prepare_cpus,
.smp_boot_secondary = shmobile_smp_apmu_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_disable = shmobile_smp_cpu_disable,
.cpu_die = shmobile_smp_apmu_cpu_die,
.cpu_kill = shmobile_smp_apmu_cpu_kill,
#endif
};