| From 67254fd71e313f20bdc9024401fc64f342b8ec1a Mon Sep 17 00:00:00 2001 |
| From: Magnus Damm <damm@opensource.se> |
| Date: Tue, 1 Oct 2013 17:13:16 +0900 |
| Subject: ARM: shmobile: r8a7791 SMP support |
| |
| 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> |
| (cherry picked from commit 2349199db55bfb99e2ebdce285a7e297ba63a7ef) |
| Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
| --- |
| arch/arm/mach-shmobile/Makefile | 1 + |
| arch/arm/mach-shmobile/include/mach/r8a7791.h | 1 + |
| arch/arm/mach-shmobile/setup-r8a7791.c | 1 + |
| arch/arm/mach-shmobile/smp-r8a7791.c | 62 +++++++++++++++++++++++++++ |
| 4 files changed, 65 insertions(+) |
| create mode 100644 arch/arm/mach-shmobile/smp-r8a7791.c |
| |
| diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-shmobile/Makefile |
| index af9e0ee9bea7..663f8941153a 100644 |
| --- a/arch/arm/mach-shmobile/Makefile |
| +++ b/arch/arm/mach-shmobile/Makefile |
| @@ -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 |
| diff --git a/arch/arm/mach-shmobile/include/mach/r8a7791.h b/arch/arm/mach-shmobile/include/mach/r8a7791.h |
| index 2a86a5394672..051ead3c286e 100644 |
| --- a/arch/arm/mach-shmobile/include/mach/r8a7791.h |
| +++ b/arch/arm/mach-shmobile/include/mach/r8a7791.h |
| @@ -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__ */ |
| diff --git a/arch/arm/mach-shmobile/setup-r8a7791.c b/arch/arm/mach-shmobile/setup-r8a7791.c |
| index cb3859b4cc95..d9393d61ee27 100644 |
| --- a/arch/arm/mach-shmobile/setup-r8a7791.c |
| +++ b/arch/arm/mach-shmobile/setup-r8a7791.c |
| @@ -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, |
| diff --git a/arch/arm/mach-shmobile/smp-r8a7791.c b/arch/arm/mach-shmobile/smp-r8a7791.c |
| new file mode 100644 |
| index 000000000000..2df5bd190fe4 |
| --- /dev/null |
| +++ b/arch/arm/mach-shmobile/smp-r8a7791.c |
| @@ -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 |
| +}; |
| -- |
| 1.8.5.rc3 |
| |