linux-kernel - Please ignore this one [Was: RE: [PATCH 1/1] arm: rzn1: Add support for the second CPU.]

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Date:   Mon, 16 Apr 2018 09:45:24 +0000
From:   Michel Pollet <michel.pollet@...renesas.com>
To:     Michel Pollet <michel.pollet@...renesas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Simon Horman <horms@...ge.net.au>
CC:     Phil Edworthy <phil.edworthy@...esas.com>,
        "buserror+upstream@...il.com" <buserror+upstream@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Magnus Damm <magnus.damm@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Chen-Yu Tsai <wens@...e.org>,
        Kevin Hilman <khilman@...libre.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        "Rajendra Nayak" <rnayak@...eaurora.org>,
        Frank Rowand <frank.rowand@...y.com>,
        "Florian Fainelli" <f.fainelli@...il.com>,
        Carlo Caione <carlo@...lessm.com>,
        "Juri Lelli" <juri.lelli@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Please ignore this one [Was: RE: [PATCH 1/1] arm: rzn1: Add support
 for the second CPU.]

Please ignore this one... it's rebase junk 😊

Michel

>
> This enables starting the second CA7 core. Also handles the case the
> bootloader has had to change the second CPU parking address to allow
> booting in NONSEC/HYP.
>
> Signed-off-by: Michel Pollet <michel.pollet@...renesas.com>
> ---
>  arch/arm/mach-shmobile/Makefile          |  1 +
>  arch/arm/mach-shmobile/r9a06g032.h       |  7 +++
>  arch/arm/mach-shmobile/setup-r9a06g032.c |  2 +
>  arch/arm/mach-shmobile/smp-r9a06g032.c   | 88
> ++++++++++++++++++++++++++++++++
>  4 files changed, 98 insertions(+)
>  create mode 100644 arch/arm/mach-shmobile/r9a06g032.h
>  create mode 100644 arch/arm/mach-shmobile/smp-r9a06g032.c
>
> diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-
> shmobile/Makefile index a63e5c2..e0f8c97 100644
> --- a/arch/arm/mach-shmobile/Makefile
> +++ b/arch/arm/mach-shmobile/Makefile
> @@ -36,6 +36,7 @@ smp-$(CONFIG_ARCH_R8A7779)+= smp-r8a7779.o
> headsmp-scu.o platsmp-scu.o
>  smp-$(CONFIG_ARCH_R8A7790)+= smp-r8a7790.o
>  smp-$(CONFIG_ARCH_R8A7791)+= smp-r8a7791.o
>  smp-$(CONFIG_ARCH_EMEV2)+= smp-emev2.o headsmp-scu.o
> platsmp-scu.o
> +smp-$(CONFIG_ARCH_R9A06G032)+= smp-r9a06g032.o
>
>  # PM objects
>  obj-$(CONFIG_SUSPEND)+= suspend.o
> diff --git a/arch/arm/mach-shmobile/r9a06g032.h b/arch/arm/mach-
> shmobile/r9a06g032.h
> new file mode 100644
> index 0000000..3992e97
> --- /dev/null
> +++ b/arch/arm/mach-shmobile/r9a06g032.h
> @@ -0,0 +1,7 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __R9A06G032_H__
> +#define __R9A06G032_H__
> +
> +extern const struct smp_operations rzn1_smp_ops;
> +
> +#endif /* __R9A06G032_H__ */
> diff --git a/arch/arm/mach-shmobile/setup-r9a06g032.c b/arch/arm/mach-
> shmobile/setup-r9a06g032.c
> index 65288e1..7bc6216 100644
> --- a/arch/arm/mach-shmobile/setup-r9a06g032.c
> +++ b/arch/arm/mach-shmobile/setup-r9a06g032.c
> @@ -11,6 +11,7 @@
>  #include <asm/mach/arch.h>
>  #include <dt-bindings/soc/renesas,rzn1-map.h>
>  #include <soc/rzn1/sysctrl.h>
> +#include "r9a06g032.h"
>
>  static void __iomem *sysctrl_base_addr;
>
> @@ -50,6 +51,7 @@ static const char *rzn1_boards_compat_dt[] __initconst
> = {  };
>
>  DT_MACHINE_START(RZN1_DT, "Renesas RZ/N1 (Device Tree)")
> +.smp= smp_ops(rzn1_smp_ops),
>  .dt_compat      = rzn1_boards_compat_dt,
>  .restart= rzn1_restart,
>  MACHINE_END
> diff --git a/arch/arm/mach-shmobile/smp-r9a06g032.c b/arch/arm/mach-
> shmobile/smp-r9a06g032.c
> new file mode 100644
> index 0000000..e441188
> --- /dev/null
> +++ b/arch/arm/mach-shmobile/smp-r9a06g032.c
> @@ -0,0 +1,88 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * SMP support for Renesas RZ/N1D
> + *
> + * Copyright (C) 2018 Renesas Electronics Europe Limited
> + *
> + * Michel Pollet <michel.pollet@...renesas.com>, <buserror@...il.com>
> + *
> + * Based on code
> + *  Copyright (C) 2012-2013 Allwinner Ltd.
> + *
> + */
> +
> +#include <linux/of.h>
> +#include <soc/rzn1/sysctrl.h>
> +#include "r9a06g032.h"
> +
> +#define BOOTADDR2_CANARY0x525a4e31
> +
> +static void __iomem *pen2_base;
> +
> +static DEFINE_SPINLOCK(cpu_lock);
> +
> +/*
> + * The alternate boot address for the second core can be overridden in
> +the DT,
> + * typically this will happen if the bootloader decides to park the
> +second
> + * core somewhere else than the fixed ALT_BOOTADDR address.
> + *
> + * This use case is required for NONSEC, as the SYSCTRL BOOTADDR
> +register isn't
> + * available after switching mode, so the bootloader parks the CPU#2 in
> +a pen
> + * is SRAM to await on an alternate address (followed by a canary) then
> +the
> + * bootloader switches mode, and finaly starts the kernel...
> + * The address of that alternate 'register' is passed in /chosen.
> + */
> +static void __init rzn1_smp_prepare_cpus(unsigned int max_cpus) {
> +u32 bootaddr = 0;
> +struct device_node *np = of_find_node_by_path("/chosen");
> +
> +if (np)
> +of_property_read_u32(np, "rzn1,bootaddr", &bootaddr);
> +
> +if (bootaddr &&
> +bootaddr != RZN1_SYSCTRL_REG_BOOTADDR &&
> +bootaddr !=
> (RZN1_SYSTEM_CTRL_BASE+RZN1_SYSCTRL_REG_BOOTADDR)) {
> +
> +pr_info("RZ/N1 CPU#2 boot address %08x\n", bootaddr);
> +pen2_base = ioremap(bootaddr, 8);
> +
> +if (!pen2_base)
> +pr_warn("Couldn't map RZ/N1 CPU#2 PEN2\n");
> +return;
> +}
> +pr_info("RZ/N1 CPU#2 boot address not specified - using SYSCTRL
> +reg\n"); }
> +
> +static int __init rzn1_smp_boot_secondary(unsigned int cpu,
> +    struct task_struct *idle)
> +{
> +u32 t = (u32)virt_to_phys(secondary_startup);
> +
> +/* Inform on what is the second CPU boot address */
> +if (pen2_base && (readl(pen2_base + 4) == BOOTADDR2_CANARY))
> +pr_info("RZ/N1 CPU#%d writing %08x to boot address\n",
> cpu, t);
> +else
> +pr_info("RZ/N1 CPU#%d writing %08x to SYSCTRL reg\n",
> cpu, t);
> +
> +spin_lock(&cpu_lock);
> +
> +/* Set CPU boot address */
> +if (pen2_base && (readl(pen2_base + 4) == BOOTADDR2_CANARY))
> +writel(virt_to_phys(secondary_startup), pen2_base);
> +else
> +rzn1_sysctrl_writel(virt_to_phys(secondary_startup),
> +RZN1_SYSCTRL_REG_BOOTADDR);
> +
> +arch_send_wakeup_ipi_mask(cpumask_of(cpu));
> +
> +spin_unlock(&cpu_lock);
> +
> +return 0;
> +}
> +
> +const struct smp_operations rzn1_smp_ops __initconst = {
> +.smp_prepare_cpus= rzn1_smp_prepare_cpus,
> +.smp_boot_secondary= rzn1_smp_boot_secondary,
> +};
> +CPU_METHOD_OF_DECLARE(rzn1_smp, "renesas,r9a06g032",
> &rzn1_smp_ops);
> --
> 2.7.4




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