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Message-ID: <CAL_JsqJotYwwC490XmCtn_=-mrosxG3UUCy0P_SVO3d94yW6VA@mail.gmail.com>
Date: Mon, 19 Nov 2018 10:24:11 -0600
From: Rob Herring <robh+dt@...nel.org>
To: sugaya.taichi@...ionext.com
Cc: linux-clk <linux-clk@...r.kernel.org>, devicetree@...r.kernel.org,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Russell King <linux@...linux.org.uk>,
Jiri Slaby <jslaby@...e.com>,
Masami Hiramatsu <masami.hiramatsu@...aro.org>,
Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH 01/14] ARM: milbeaut: Add basic support for Milbeaut m10v SoC
On Sun, Nov 18, 2018 at 7:00 PM Sugaya Taichi
<sugaya.taichi@...ionext.com> wrote:
>
> This adds the basic M10V SoC support under arch/arm.
> Since all cores are activated in the custom bootloader before booting
> linux, it is necessary to wait for sub-cores using the trampoline area.
>
> Signed-off-by: Sugaya Taichi <sugaya.taichi@...ionext.com>
> ---
> arch/arm/Kconfig | 2 +
> arch/arm/Makefile | 1 +
> arch/arm/mach-milbeaut/Kconfig | 28 +++++++
> arch/arm/mach-milbeaut/Makefile | 3 +
> arch/arm/mach-milbeaut/m10v_evb.c | 31 ++++++++
> arch/arm/mach-milbeaut/platsmp.c | 157 ++++++++++++++++++++++++++++++++++++++
> 6 files changed, 222 insertions(+)
> create mode 100644 arch/arm/mach-milbeaut/Kconfig
> create mode 100644 arch/arm/mach-milbeaut/Makefile
> create mode 100644 arch/arm/mach-milbeaut/m10v_evb.c
> create mode 100644 arch/arm/mach-milbeaut/platsmp.c
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 91be74d..0b8a1af 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -767,6 +767,8 @@ source "arch/arm/mach-mediatek/Kconfig"
>
> source "arch/arm/mach-meson/Kconfig"
>
> +source "arch/arm/mach-milbeaut/Kconfig"
> +
> source "arch/arm/mach-mmp/Kconfig"
>
> source "arch/arm/mach-moxart/Kconfig"
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index 05a91d8..627853c 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -190,6 +190,7 @@ machine-$(CONFIG_ARCH_MV78XX0) += mv78xx0
> machine-$(CONFIG_ARCH_MVEBU) += mvebu
> machine-$(CONFIG_ARCH_MXC) += imx
> machine-$(CONFIG_ARCH_MEDIATEK) += mediatek
> +machine-$(CONFIG_ARCH_MILBEAUT) += milbeaut
> machine-$(CONFIG_ARCH_MXS) += mxs
> machine-$(CONFIG_ARCH_NETX) += netx
> machine-$(CONFIG_ARCH_NOMADIK) += nomadik
> diff --git a/arch/arm/mach-milbeaut/Kconfig b/arch/arm/mach-milbeaut/Kconfig
> new file mode 100644
> index 0000000..63b6f69
> --- /dev/null
> +++ b/arch/arm/mach-milbeaut/Kconfig
> @@ -0,0 +1,28 @@
> +# SPDX-License-Identifier: GPL-2.0
> +menuconfig ARCH_MILBEAUT
> + bool "Socionext Milbeaut SoCs"
> + depends on ARCH_MULTI_V7
> + select ARM_GIC
> + select CLKDEV_LOOKUP
> + select GENERIC_CLOCKEVENTS
> + select CLKSRC_MMIO
The clock and timer drivers' kconfig entries should select these.
> + select ZONE_DMA
Why is this needed?
> + help
> + This enables support for Socionext Milbeaut SoCs
> +
> +if ARCH_MILBEAUT
> +
> +config ARCH_MILBEAUT_M10V
> + bool "Milbeaut SC2000/M10V platform"
> + select ARM_ARCH_TIMER
> + select M10V_TIMER
> + select PINCTRL
> + select PINCTRL_M10V
> + help
> + Support for Socionext's MILBEAUT M10V based systems
> +
> +config MACH_M10V_EVB
> + bool "Support for Milbeaut Evaluation boards"
You shouldn't need a kconfig entry for each board.
> + default y
> +
> +endif
> diff --git a/arch/arm/mach-milbeaut/Makefile b/arch/arm/mach-milbeaut/Makefile
> new file mode 100644
> index 0000000..64f6f52
> --- /dev/null
> +++ b/arch/arm/mach-milbeaut/Makefile
> @@ -0,0 +1,3 @@
> +obj-$(CONFIG_SMP) += platsmp.o
> +obj-$(CONFIG_MACH_M10V_EVB) += m10v_evb.o
> +
> diff --git a/arch/arm/mach-milbeaut/m10v_evb.c b/arch/arm/mach-milbeaut/m10v_evb.c
> new file mode 100644
> index 0000000..a1fa7c3
> --- /dev/null
> +++ b/arch/arm/mach-milbeaut/m10v_evb.c
This all looks SoC specific, not board specific.
> @@ -0,0 +1,31 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2018 Socionext Inc.
> + * Copyright: (C) 2015 Linaro Ltd.
> + */
> +
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
Not needed.
> +
> +#include <asm/mach/arch.h>
> +#include <asm/mach/map.h>
> +
> +static struct map_desc m10v_io_desc[] __initdata = {
> +};
> +
> +void __init m10v_map_io(void)
> +{
> + debug_ll_io_init();
If you use earlycon instead, then this isn't needed.
> + iotable_init(m10v_io_desc, ARRAY_SIZE(m10v_io_desc));
This isn't needed.
> +}
> +
> +static const char * const m10v_compat[] = {
> + "socionext,milbeaut-m10v-evb",
> + NULL,
> +};
> +
> +DT_MACHINE_START(M10V_REB, "Socionext Milbeaut")
> + .dt_compat = m10v_compat,
> + .l2c_aux_mask = 0xffffffff,
> + .map_io = m10v_map_io,
It looks like you can remove this entire file and use the default machine desc.
> +MACHINE_END
> diff --git a/arch/arm/mach-milbeaut/platsmp.c b/arch/arm/mach-milbeaut/platsmp.c
> new file mode 100644
> index 0000000..b706851
> --- /dev/null
> +++ b/arch/arm/mach-milbeaut/platsmp.c
> @@ -0,0 +1,157 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2018 Socionext Inc.
> + * Copyright: (C) 2015 Linaro Ltd.
> + */
> +
> +#include <linux/cpu_pm.h>
> +#include <linux/irqchip/arm-gic.h>
> +#include <linux/of_device.h>
Not needed.
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
Not needed.
> +#include <linux/suspend.h>
> +
> +#include <asm/cacheflush.h>
> +#include <asm/cp15.h>
> +#include <asm/idmap.h>
> +#include <asm/smp_plat.h>
> +#include <asm/suspend.h>
> +
> +#define M10V_MAX_CPU 4
> +
> +#define KERNEL_UNBOOT_FLAG 0x12345678
> +#define CPU_FINISH_SUSPEND_FLAG 0x56784321
> +
> +static void __iomem *trampoline;
> +
> +static int m10v_boot_secondary(unsigned int l_cpu, struct task_struct *idle)
> +{
> + unsigned int mpidr, cpu, cluster;
> +
> + mpidr = cpu_logical_map(l_cpu);
> + cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
> + cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
> +
> + if (cpu >= M10V_MAX_CPU)
> + return -EINVAL;
> +
> + pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
> +
> + writel(virt_to_phys(secondary_startup), trampoline + cpu * 4);
> + arch_send_wakeup_ipi_mask(cpumask_of(l_cpu));
> +
> + return 0;
> +}
> +
> +static void m10v_cpu_die(unsigned int l_cpu)
> +{
> + gic_cpu_if_down(0);
> +
> + v7_exit_coherency_flush(louis);
> +
> + /* Now we are prepared for power-down, do it: */
> + wfi();
> +}
> +
> +static int m10v_cpu_kill(unsigned int l_cpu)
> +{
> + unsigned int mpidr, cpu;
> +
> + mpidr = cpu_logical_map(l_cpu);
> + cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
> +
> + writel(KERNEL_UNBOOT_FLAG, trampoline + cpu * 4);
> +
> + return 1;
> +}
> +
> +static struct smp_operations m10v_smp_ops __initdata = {
> + .smp_boot_secondary = m10v_boot_secondary,
> + .cpu_die = m10v_cpu_die,
> + .cpu_kill = m10v_cpu_kill,
> +};
> +
> +static int __init m10v_smp_init(void)
> +{
> + unsigned int mpidr, cpu, cluster;
> + struct device_node *np;
> +
> + np = of_find_compatible_node(NULL, NULL, "socionext,milbeaut-m10v-evb");
> + if (!np || !of_device_is_available(np))
Just use of_machine_is_compatible() here.
> + return -ENODEV;
> + of_node_put(np);
> +
> + np = of_find_compatible_node(NULL, NULL, "socionext,smp-trampoline");
> + if (!np)
> + return -ENODEV;
> +
> + trampoline = of_iomap(np, 0);
> + if (!trampoline)
> + return -ENODEV;
> + of_node_put(np);
> +
> + mpidr = read_cpuid_mpidr();
> + cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
> + cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
> +
> + pr_info("MCPM boot on cpu_%u cluster_%u\n", cpu, cluster);
> +
> + for (cpu = 0; cpu < M10V_MAX_CPU; cpu++)
> + writel(KERNEL_UNBOOT_FLAG, trampoline + cpu * 4);
> +
> + smp_set_ops(&m10v_smp_ops);
> +
> + return 0;
> +}
> +early_initcall(m10v_smp_init);
> +
> +static int m10v_pm_valid(suspend_state_t state)
> +{
> + return (state == PM_SUSPEND_STANDBY) || (state == PM_SUSPEND_MEM);
> +}
> +
> +typedef void (*phys_reset_t)(unsigned long);
> +static phys_reset_t phys_reset;
> +
> +static int m10v_die(unsigned long arg)
> +{
> + setup_mm_for_reboot();
> + asm("wfi");
> + /* Boot just like a secondary */
> + phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
> + phys_reset(virt_to_phys(cpu_resume));
> +
> + return 0;
> +}
> +
> +static int m10v_pm_enter(suspend_state_t state)
> +{
> + switch (state) {
> + case PM_SUSPEND_STANDBY:
> + pr_err("STANDBY\n");
> + asm("wfi");
> + break;
> + case PM_SUSPEND_MEM:
> + pr_err("SUSPEND\n");
> + cpu_pm_enter();
> + cpu_suspend(0, m10v_die);
> + cpu_pm_exit();
> + break;
> + }
> + return 0;
> +}
> +
> +static const struct platform_suspend_ops m10v_pm_ops = {
> + .valid = m10v_pm_valid,
> + .enter = m10v_pm_enter,
> +};
> +
> +struct clk *m10v_clclk_register(struct device *cpu_dev);
> +
> +static int __init m10v_pm_init(void)
> +{
> + suspend_set_ops(&m10v_pm_ops);
> +
> + return 0;
> +}
> +late_initcall(m10v_pm_init);
> --
> 1.9.1
>
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