On 8/9/19 2:31 AM, Lubomir Rintel wrote:
> Used to bring up the second core on MMP3.
>
> Signed-off-by: Lubomir Rintel <lkundrak@xxxxx>
> ---
> arch/arm/mach-mmp/Makefile | 3 +++
> arch/arm/mach-mmp/platsmp.c | 32 ++++++++++++++++++++++++++++++++
> 2 files changed, 35 insertions(+)
> create mode 100644 arch/arm/mach-mmp/platsmp.c
>
> diff --git a/arch/arm/mach-mmp/Makefile b/arch/arm/mach-mmp/Makefile
> index 322c1c97dc900..7b3a7f979eece 100644
> --- a/arch/arm/mach-mmp/Makefile
> +++ b/arch/arm/mach-mmp/Makefile
> @@ -22,6 +22,9 @@ ifeq ($(CONFIG_PM),y)
> obj-$(CONFIG_CPU_PXA910) += pm-pxa910.o
> obj-$(CONFIG_CPU_MMP2) += pm-mmp2.o
> endif
> +ifeq ($(CONFIG_SMP),y)
> +obj-$(CONFIG_MACH_MMP3_DT) += platsmp.o
> +endif
>
> # board support
> obj-$(CONFIG_MACH_ASPENITE) += aspenite.o
> diff --git a/arch/arm/mach-mmp/platsmp.c b/arch/arm/mach-mmp/platsmp.c
> new file mode 100644
> index 0000000000000..255df640b5bc1
> --- /dev/null
> +++ b/arch/arm/mach-mmp/platsmp.c
> @@ -0,0 +1,32 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2019 Lubomir Rintel <lkundrak@xxxxx>
> + */
> +#include <linux/io.h>
> +#include <asm/smp_scu.h>
> +#include <asm/smp.h>
> +#include "addr-map.h"
> +
> +#define SW_BRANCH_VIRT_ADDR CIU_REG(0x24)
> +
> +static int mmp3_boot_secondary(unsigned int cpu, struct task_struct *idle)
> +{
> + /*
> + * Apparently, the boot ROM on the second core spins on this
> + * register becoming non-zero and then jumps to the address written
> + * there. No IPIs involved.
> + */
> + __raw_writel(virt_to_phys(secondary_startup), SW_BRANCH_VIRT_ADDR);
You would want to use __pa_symbol() here (which is equivalent, but will
avoid barfing on you with CONFIG_DEBUG_VIRTUAL).
--
Florian
