projects / mirror_ubuntu-disco-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 5420b4b1 LW |
1 | /* |
| 2 | * Copyright (C) 2015 Linus Walleij | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | */ | |
| 8 | #include <linux/smp.h> | |
| 9 | #include <linux/io.h> | |
| 10 | #include <linux/of.h> | |
| 11 | #include <linux/of_address.h> | |
| 12 | #include <linux/regmap.h> | |
| 13 | #include <linux/mfd/syscon.h> | |
| 14 | ||
| 15 | #include <asm/cacheflush.h> | |
| 16 | #include <asm/smp_plat.h> | |
| 17 | #include <asm/smp_scu.h> | |
| 18 | ||
| 19 | #include <plat/platsmp.h> | |
| 5420b4b1 LW |
20 | |
| 21 | #define REALVIEW_SYS_FLAGSSET_OFFSET 0x30 | |
| 22 | ||
| 23 | static const struct of_device_id realview_scu_match[] = { | |
| 24 | { .compatible = "arm,arm11mp-scu", }, | |
| 25 | { .compatible = "arm,cortex-a9-scu", }, | |
| 26 | { .compatible = "arm,cortex-a5-scu", }, | |
| 27 | { } | |
| 28 | }; | |
| 29 | ||
| 30 | static const struct of_device_id realview_syscon_match[] = { | |
| 31 | { .compatible = "arm,core-module-integrator", }, | |
| 32 | { .compatible = "arm,realview-eb-syscon", }, | |
| 33 | { .compatible = "arm,realview-pb11mp-syscon", }, | |
| 34 | { .compatible = "arm,realview-pbx-syscon", }, | |
| 35 | { }, | |
| 36 | }; | |
| 37 | ||
| 38 | static void __init realview_smp_prepare_cpus(unsigned int max_cpus) | |
| 39 | { | |
| 40 | struct device_node *np; | |
| 41 | void __iomem *scu_base; | |
| 42 | struct regmap *map; | |
| 43 | unsigned int ncores; | |
| 44 | int i; | |
| 45 | ||
| 46 | np = of_find_matching_node(NULL, realview_scu_match); | |
| 47 | if (!np) { | |
| 48 | pr_err("PLATSMP: No SCU base address\n"); | |
| 49 | return; | |
| 50 | } | |
| 51 | scu_base = of_iomap(np, 0); | |
| 52 | of_node_put(np); | |
| 53 | if (!scu_base) { | |
| 54 | pr_err("PLATSMP: No SCU remap\n"); | |
| 55 | return; | |
| 56 | } | |
| 57 | ||
| 58 | scu_enable(scu_base); | |
| 59 | ncores = scu_get_core_count(scu_base); | |
| 60 | pr_info("SCU: %d cores detected\n", ncores); | |
| 61 | for (i = 0; i < ncores; i++) | |
| 62 | set_cpu_possible(i, true); | |
| 63 | iounmap(scu_base); | |
| 64 | ||
| 65 | /* The syscon contains the magic SMP start address registers */ | |
| 66 | np = of_find_matching_node(NULL, realview_syscon_match); | |
| 67 | if (!np) { | |
| 68 | pr_err("PLATSMP: No syscon match\n"); | |
| 69 | return; | |
| 70 | } | |
| 71 | map = syscon_node_to_regmap(np); | |
| 72 | if (IS_ERR(map)) { | |
| 73 | pr_err("PLATSMP: No syscon regmap\n"); | |
| 74 | return; | |
| 75 | } | |
| 76 | /* Put the boot address in this magic register */ | |
| 77 | regmap_write(map, REALVIEW_SYS_FLAGSSET_OFFSET, | |
| 64fc2a94 | 78 | __pa_symbol(versatile_secondary_startup)); |
| 5420b4b1 LW |
79 | } |
| 80 | ||
| 4fb68e12 RK |
81 | #ifdef CONFIG_HOTPLUG_CPU |
| 82 | static void realview_cpu_die(unsigned int cpu) | |
| 83 | { | |
| 84 | return versatile_immitation_cpu_die(cpu, 0x20); | |
| 85 | } | |
| 86 | #endif | |
| 87 | ||
| 567fdd9d | 88 | static const struct smp_operations realview_dt_smp_ops __initconst = { |
| 5420b4b1 LW |
89 | .smp_prepare_cpus = realview_smp_prepare_cpus, |
| 90 | .smp_secondary_init = versatile_secondary_init, | |
| 91 | .smp_boot_secondary = versatile_boot_secondary, | |
| 92 | #ifdef CONFIG_HOTPLUG_CPU | |
| 93 | .cpu_die = realview_cpu_die, | |
| 94 | #endif | |
| 95 | }; | |
| 96 | CPU_METHOD_OF_DECLARE(realview_smp, "arm,realview-smp", &realview_dt_smp_ops); |