diff options
Diffstat (limited to 'arch/arm/mach-mmp/platsmp.c')
| -rw-r--r-- | arch/arm/mach-mmp/platsmp.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/mach-mmp/platsmp.c b/arch/arm/mach-mmp/platsmp.c new file mode 100644 index 0000000000..c99405469b --- /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@v3.sk> + */ +#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(__pa_symbol(secondary_startup), SW_BRANCH_VIRT_ADDR); + return 0; +} + +static void mmp3_smp_prepare_cpus(unsigned int max_cpus) +{ + scu_enable(SCU_VIRT_BASE); +} + +static const struct smp_operations mmp3_smp_ops __initconst = { + .smp_prepare_cpus = mmp3_smp_prepare_cpus, + .smp_boot_secondary = mmp3_boot_secondary, +}; +CPU_METHOD_OF_DECLARE(mmp3_smp, "marvell,mmp3-smp", &mmp3_smp_ops); |