diff options
| -rw-r--r-- | arch/arm/mach-berlin/Kconfig | 3 | ||||
| -rw-r--r-- | arch/arm/mach-berlin/Makefile | 3 | ||||
| -rw-r--r-- | arch/arm/mach-berlin/headsmp.S | 30 | ||||
| -rw-r--r-- | arch/arm/mach-berlin/platsmp.c | 99 |
4 files changed, 134 insertions, 1 deletions
diff --git a/arch/arm/mach-berlin/Kconfig b/arch/arm/mach-berlin/Kconfig index 101e0f3..ba5b6ce 100644 --- a/arch/arm/mach-berlin/Kconfig +++ b/arch/arm/mach-berlin/Kconfig @@ -15,7 +15,9 @@ config MACH_BERLIN_BG2 bool "Marvell Armada 1500 (BG2)" select CACHE_L2X0 select CPU_PJ4B + select HAVE_ARM_SCU if SMP select HAVE_ARM_TWD if SMP + select HAVE_SMP select PINCTRL_BERLIN_BG2 config MACH_BERLIN_BG2CD @@ -27,6 +29,7 @@ config MACH_BERLIN_BG2CD config MACH_BERLIN_BG2Q bool "Marvell Armada 1500 Pro (BG2-Q)" select CACHE_L2X0 + select HAVE_ARM_SCU if SMP select HAVE_ARM_TWD if SMP select PINCTRL_BERLIN_BG2Q diff --git a/arch/arm/mach-berlin/Makefile b/arch/arm/mach-berlin/Makefile index ab69fe9..c0719ec 100644 --- a/arch/arm/mach-berlin/Makefile +++ b/arch/arm/mach-berlin/Makefile @@ -1 +1,2 @@ -obj-y += berlin.o +obj-y += berlin.o +obj-$(CONFIG_SMP) += headsmp.o platsmp.o diff --git a/arch/arm/mach-berlin/headsmp.S b/arch/arm/mach-berlin/headsmp.S new file mode 100644 index 0000000..4a4c56a --- /dev/null +++ b/arch/arm/mach-berlin/headsmp.S @@ -0,0 +1,30 @@ +/* + * Copyright (C) 2014 Marvell Technology Group Ltd. + * + * Antoine Ténart <antoine.tenart@free-electrons.com> + * + * 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 <linux/linkage.h> +#include <linux/init.h> +#include <asm/assembler.h> + +ENTRY(berlin_secondary_startup) + ARM_BE8(setend be) + bl v7_invalidate_l1 + b secondary_startup +ENDPROC(berlin_secondary_startup) + +/* + * If the following instruction is set in the reset exception vector, CPUs + * will fetch the value of the software reset address vector when being + * reset. + */ +.global boot_inst +boot_inst: + ldr pc, [pc, #140] + + .align diff --git a/arch/arm/mach-berlin/platsmp.c b/arch/arm/mach-berlin/platsmp.c new file mode 100644 index 0000000..702e798 --- /dev/null +++ b/arch/arm/mach-berlin/platsmp.c @@ -0,0 +1,99 @@ +/* + * Copyright (C) 2014 Marvell Technology Group Ltd. + * + * Antoine Ténart <antoine.tenart@free-electrons.com> + * + * 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 <linux/io.h> +#include <linux/delay.h> +#include <linux/of.h> +#include <linux/of_address.h> + +#include <asm/cacheflush.h> +#include <asm/smp_plat.h> +#include <asm/smp_scu.h> + +#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); |
