projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 59ac59f6 RK |
1 | /* |
| 2 | * linux/arch/arm/mach-vexpress/platsmp.c | |
| 3 | * | |
| 4 | * Copyright (C) 2002 ARM Ltd. | |
| 5 | * All Rights Reserved | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | #include <linux/init.h> | |
| 12 | #include <linux/errno.h> | |
| 59ac59f6 RK |
13 | #include <linux/smp.h> |
| 14 | #include <linux/io.h> | |
| d2606f81 | 15 | #include <linux/of_address.h> |
| 38669e04 | 16 | #include <linux/vexpress.h> |
| 95d59741 | 17 | |
| 033a899c | 18 | #include <asm/mcpm.h> |
| 95d59741 | 19 | #include <asm/smp_scu.h> |
| 95d59741 | 20 | #include <asm/mach/map.h> |
| 59ac59f6 | 21 | |
| 3695adc2 | 22 | #include <plat/platsmp.h> |
| 59ac59f6 | 23 | |
| 3695adc2 | 24 | #include "core.h" |
| 3705ff6d | 25 | |
| 033a899c JM |
26 | bool __init vexpress_smp_init_ops(void) |
| 27 | { | |
| 28 | #ifdef CONFIG_MCPM | |
| 29 | /* | |
| 30 | * The best way to detect a multi-cluster configuration at the moment | |
| 31 | * is to look for the presence of a CCI in the system. | |
| 32 | * Override the default vexpress_smp_ops if so. | |
| 33 | */ | |
| 34 | struct device_node *node; | |
| 35 | node = of_find_compatible_node(NULL, NULL, "arm,cci-400"); | |
| 36 | if (node && of_device_is_available(node)) { | |
| 37 | mcpm_smp_set_ops(); | |
| 38 | return true; | |
| 39 | } | |
| 40 | #endif | |
| 41 | return false; | |
| 42 | } | |
| d2606f81 | 43 | |
| d2606f81 PM |
44 | static const struct of_device_id vexpress_smp_dt_scu_match[] __initconst = { |
| 45 | { .compatible = "arm,cortex-a5-scu", }, | |
| 46 | { .compatible = "arm,cortex-a9-scu", }, | |
| 47 | {} | |
| 48 | }; | |
| 49 | ||
| 50 | static void __init vexpress_smp_dt_prepare_cpus(unsigned int max_cpus) | |
| 51 | { | |
| 52 | struct device_node *scu = of_find_matching_node(NULL, | |
| 53 | vexpress_smp_dt_scu_match); | |
| 54 | ||
| 55 | if (scu) | |
| 56 | scu_enable(of_iomap(scu, 0)); | |
| 57 | ||
| 58 | /* | |
| 59 | * Write the address of secondary startup into the | |
| 60 | * system-wide flags register. The boot monitor waits | |
| 61 | * until it receives a soft interrupt, and then the | |
| 62 | * secondary CPU branches to this address. | |
| 63 | */ | |
| 64 | vexpress_flags_set(virt_to_phys(versatile_secondary_startup)); | |
| 65 | } | |
| 66 | ||
| 67 | struct smp_operations __initdata vexpress_smp_dt_ops = { | |
| 68 | .smp_prepare_cpus = vexpress_smp_dt_prepare_cpus, | |
| 69 | .smp_secondary_init = versatile_secondary_init, | |
| 70 | .smp_boot_secondary = versatile_boot_secondary, | |
| 71 | #ifdef CONFIG_HOTPLUG_CPU | |
| 72 | .cpu_die = vexpress_cpu_die, | |
| 73 | #endif | |
| 74 | }; |