From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/arm/mach-berlin/platsmp.c | 99 +++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 kernel/arch/arm/mach-berlin/platsmp.c (limited to 'kernel/arch/arm/mach-berlin/platsmp.c') diff --git a/kernel/arch/arm/mach-berlin/platsmp.c b/kernel/arch/arm/mach-berlin/platsmp.c new file mode 100644 index 000000000..702e79820 --- /dev/null +++ b/kernel/arch/arm/mach-berlin/platsmp.c @@ -0,0 +1,99 @@ +/* + * Copyright (C) 2014 Marvell Technology Group Ltd. + * + * Antoine Ténart + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include + +#include +#include +#include + +#define CPU_RESET 0x00 + +#define RESET_VECT 0x00 +#define SW_RESET_ADDR 0x94 + +extern void berlin_secondary_startup(void); +extern u32 boot_inst; + +static void __iomem *cpu_ctrl; + +static inline void berlin_perform_reset_cpu(unsigned int cpu) +{ + u32 val; + + val = readl(cpu_ctrl + CPU_RESET); + val |= BIT(cpu_logical_map(cpu)); + writel(val, cpu_ctrl + CPU_RESET); +} + +static int berlin_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + if (!cpu_ctrl) + return -EFAULT; + + /* + * Reset the CPU, making it to execute the instruction in the reset + * exception vector. + */ + berlin_perform_reset_cpu(cpu); + + return 0; +} + +static void __init berlin_smp_prepare_cpus(unsigned int max_cpus) +{ + struct device_node *np; + void __iomem *scu_base; + void __iomem *vectors_base; + + np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu"); + scu_base = of_iomap(np, 0); + of_node_put(np); + if (!scu_base) + return; + + np = of_find_compatible_node(NULL, NULL, "marvell,berlin-cpu-ctrl"); + cpu_ctrl = of_iomap(np, 0); + of_node_put(np); + if (!cpu_ctrl) + goto unmap_scu; + + vectors_base = ioremap(CONFIG_VECTORS_BASE, SZ_32K); + if (!vectors_base) + goto unmap_scu; + + scu_enable(scu_base); + flush_cache_all(); + + /* + * Write the first instruction the CPU will execute after being reset + * in the reset exception vector. + */ + writel(boot_inst, vectors_base + RESET_VECT); + + /* + * Write the secondary startup address into the SW reset address + * vector. This is used by boot_inst. + */ + writel(virt_to_phys(berlin_secondary_startup), vectors_base + SW_RESET_ADDR); + + iounmap(vectors_base); +unmap_scu: + iounmap(scu_base); +} + +static struct smp_operations berlin_smp_ops __initdata = { + .smp_prepare_cpus = berlin_smp_prepare_cpus, + .smp_boot_secondary = berlin_boot_secondary, +}; +CPU_METHOD_OF_DECLARE(berlin_smp, "marvell,berlin-smp", &berlin_smp_ops); -- cgit 1.2.3-korg