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Message-ID: <87a8a8vd1p.fsf@free-electrons.com>
Date: Mon, 30 Jan 2017 15:26:58 +0100
From: Gregory CLEMENT <gregory.clement@...e-electrons.com>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc: linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Jason Cooper <jason@...edaemon.net>,
Andrew Lunn <andrew@...n.ch>,
Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/5] arm: mvebu: support for SMP on 98DX3336 SoC
Hi Chris,
On lun., janv. 30 2017, Chris Packham <chris.packham@...iedtelesis.co.nz> wrote:
> Compared to the armada-xp the 98DX3336 uses different registers to set
> the boot address for the secondary CPU so a new enable-method is needed.
> This will only work if the machine definition doesn't define an overall
> smp_ops because there is not currently a way of overriding this from the
> device tree if it is set in the machine definition.
>
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> Acked-by: Rob Herring <robh@...nel.org>
Applied on mvebu/soc
Thanks,
Gregory
> ---
>
> Notes:
> Changes in v2:
> - Document new enable-method value
> - Correct some references from 98DX4521 to 98DX3236
> Changes in v3:
> - Simplify mv98dx3236_resume_init by using of_io_request_and_map()
> Changes in v4:
> - integrate changes into platsmp.c instead of new init call
> - avoid duplicated code.
> - fix error return
> - Collect ack from Rob
> Changes in v5:
> - Remove useless casts (thanks to Stephen Boyd)
> Changes in v6:
> - use a #define instead of a new structure for resume control registers.
>
> Documentation/devicetree/bindings/arm/cpus.txt | 1 +
> .../bindings/arm/marvell/98dx3236-resume-ctrl.txt | 16 +++++
> arch/arm/mach-mvebu/platsmp.c | 75 ++++++++++++++++++++++
> 3 files changed, 92 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/arm/marvell/98dx3236-resume-ctrl.txt
>
> diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
> index a1bcfeed5f24..3c2fd72d0bf9 100644
> --- a/Documentation/devicetree/bindings/arm/cpus.txt
> +++ b/Documentation/devicetree/bindings/arm/cpus.txt
> @@ -202,6 +202,7 @@ nodes to be present and contain the properties described below.
> "marvell,armada-380-smp"
> "marvell,armada-390-smp"
> "marvell,armada-xp-smp"
> + "marvell,98dx3236-smp"
> "mediatek,mt6589-smp"
> "mediatek,mt81xx-tz-smp"
> "qcom,gcc-msm8660"
> diff --git a/Documentation/devicetree/bindings/arm/marvell/98dx3236-resume-ctrl.txt b/Documentation/devicetree/bindings/arm/marvell/98dx3236-resume-ctrl.txt
> new file mode 100644
> index 000000000000..26eb9d3aa630
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/marvell/98dx3236-resume-ctrl.txt
> @@ -0,0 +1,16 @@
> +Resume Control
> +--------------
> +Available on Marvell SOCs: 98DX3336 and 98DX4251
> +
> +Required properties:
> +
> +- compatible: must be "marvell,98dx3336-resume-ctrl"
> +
> +- reg: Should contain resume control registers location and length
> +
> +Example:
> +
> +resume@...80 {
> + compatible = "marvell,98dx3336-resume-ctrl";
> + reg = <0x20980 0x10>;
> +};
> diff --git a/arch/arm/mach-mvebu/platsmp.c b/arch/arm/mach-mvebu/platsmp.c
> index 46c742d3bd41..e62273aacb43 100644
> --- a/arch/arm/mach-mvebu/platsmp.c
> +++ b/arch/arm/mach-mvebu/platsmp.c
> @@ -184,3 +184,78 @@ const struct smp_operations armada_xp_smp_ops __initconst = {
>
> CPU_METHOD_OF_DECLARE(armada_xp_smp, "marvell,armada-xp-smp",
> &armada_xp_smp_ops);
> +
> +#define MV98DX3236_CPU_RESUME_CTRL_REG 0x08
> +#define MV98DX3236_CPU_RESUME_ADDR_REG 0x04
> +
> +static const struct of_device_id of_mv98dx3236_resume_table[] = {
> + {
> + .compatible = "marvell,98dx3336-resume-ctrl",
> + },
> + { /* end of list */ },
> +};
> +
> +static int mv98dx3236_resume_set_cpu_boot_addr(int hw_cpu, void *boot_addr)
> +{
> + struct device_node *np;
> + void __iomem *base;
> + WARN_ON(hw_cpu != 1);
> +
> + np = of_find_matching_node(NULL, of_mv98dx3236_resume_table);
> + if (!np)
> + return -ENODEV;
> +
> + base = of_io_request_and_map(np, 0, of_node_full_name(np));
> + of_node_put(np);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + writel(0, base + MV98DX3236_CPU_RESUME_CTRL_REG);
> + writel(virt_to_phys(boot_addr), base + MV98DX3236_CPU_RESUME_ADDR_REG);
> +
> + iounmap(base);
> +
> + return 0;
> +}
> +
> +static int mv98dx3236_boot_secondary(unsigned int cpu, struct task_struct *idle)
> +{
> + int ret, hw_cpu;
> +
> + hw_cpu = cpu_logical_map(cpu);
> + set_secondary_cpu_clock(hw_cpu);
> + mv98dx3236_resume_set_cpu_boot_addr(hw_cpu,
> + armada_xp_secondary_startup);
> +
> + /*
> + * This is needed to wake up CPUs in the offline state after
> + * using CPU hotplug.
> + */
> + arch_send_wakeup_ipi_mask(cpumask_of(cpu));
> +
> + /*
> + * This is needed to take secondary CPUs out of reset on the
> + * initial boot.
> + */
> + ret = mvebu_cpu_reset_deassert(hw_cpu);
> + if (ret) {
> + pr_warn("unable to boot CPU: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static const struct smp_operations mv98dx3236_smp_ops __initconst = {
> + .smp_init_cpus = armada_xp_smp_init_cpus,
> + .smp_prepare_cpus = armada_xp_smp_prepare_cpus,
> + .smp_boot_secondary = mv98dx3236_boot_secondary,
> + .smp_secondary_init = armada_xp_secondary_init,
> +#ifdef CONFIG_HOTPLUG_CPU
> + .cpu_die = armada_xp_cpu_die,
> + .cpu_kill = armada_xp_cpu_kill,
> +#endif
> +};
> +
> +CPU_METHOD_OF_DECLARE(mv98dx3236_smp, "marvell,98dx3236-smp",
> + &mv98dx3236_smp_ops);
> --
> 2.11.0.24.ge6920cf
>
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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