Linus Walleij | 5420b4b | 2015-10-09 13:38:57 +0200 | [diff] [blame] | 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> |
Linus Walleij | 7484c72 | 2016-02-25 11:26:07 +0100 | [diff] [blame] | 20 | #include "hotplug.h" |
Linus Walleij | 5420b4b | 2015-10-09 13:38:57 +0200 | [diff] [blame] | 21 | |
| 22 | #define REALVIEW_SYS_FLAGSSET_OFFSET 0x30 |
| 23 | |
| 24 | static const struct of_device_id realview_scu_match[] = { |
| 25 | { .compatible = "arm,arm11mp-scu", }, |
| 26 | { .compatible = "arm,cortex-a9-scu", }, |
| 27 | { .compatible = "arm,cortex-a5-scu", }, |
| 28 | { } |
| 29 | }; |
| 30 | |
| 31 | static const struct of_device_id realview_syscon_match[] = { |
| 32 | { .compatible = "arm,core-module-integrator", }, |
| 33 | { .compatible = "arm,realview-eb-syscon", }, |
| 34 | { .compatible = "arm,realview-pb11mp-syscon", }, |
| 35 | { .compatible = "arm,realview-pbx-syscon", }, |
| 36 | { }, |
| 37 | }; |
| 38 | |
| 39 | static void __init realview_smp_prepare_cpus(unsigned int max_cpus) |
| 40 | { |
| 41 | struct device_node *np; |
| 42 | void __iomem *scu_base; |
| 43 | struct regmap *map; |
| 44 | unsigned int ncores; |
| 45 | int i; |
| 46 | |
| 47 | np = of_find_matching_node(NULL, realview_scu_match); |
| 48 | if (!np) { |
| 49 | pr_err("PLATSMP: No SCU base address\n"); |
| 50 | return; |
| 51 | } |
| 52 | scu_base = of_iomap(np, 0); |
| 53 | of_node_put(np); |
| 54 | if (!scu_base) { |
| 55 | pr_err("PLATSMP: No SCU remap\n"); |
| 56 | return; |
| 57 | } |
| 58 | |
| 59 | scu_enable(scu_base); |
| 60 | ncores = scu_get_core_count(scu_base); |
| 61 | pr_info("SCU: %d cores detected\n", ncores); |
| 62 | for (i = 0; i < ncores; i++) |
| 63 | set_cpu_possible(i, true); |
| 64 | iounmap(scu_base); |
| 65 | |
| 66 | /* The syscon contains the magic SMP start address registers */ |
| 67 | np = of_find_matching_node(NULL, realview_syscon_match); |
| 68 | if (!np) { |
| 69 | pr_err("PLATSMP: No syscon match\n"); |
| 70 | return; |
| 71 | } |
| 72 | map = syscon_node_to_regmap(np); |
| 73 | if (IS_ERR(map)) { |
| 74 | pr_err("PLATSMP: No syscon regmap\n"); |
| 75 | return; |
| 76 | } |
| 77 | /* Put the boot address in this magic register */ |
| 78 | regmap_write(map, REALVIEW_SYS_FLAGSSET_OFFSET, |
| 79 | virt_to_phys(versatile_secondary_startup)); |
| 80 | } |
| 81 | |
Masahiro Yamada | 567fdd9 | 2016-01-25 20:33:07 +0900 | [diff] [blame] | 82 | static const struct smp_operations realview_dt_smp_ops __initconst = { |
Linus Walleij | 5420b4b | 2015-10-09 13:38:57 +0200 | [diff] [blame] | 83 | .smp_prepare_cpus = realview_smp_prepare_cpus, |
| 84 | .smp_secondary_init = versatile_secondary_init, |
| 85 | .smp_boot_secondary = versatile_boot_secondary, |
| 86 | #ifdef CONFIG_HOTPLUG_CPU |
| 87 | .cpu_die = realview_cpu_die, |
| 88 | #endif |
| 89 | }; |
| 90 | CPU_METHOD_OF_DECLARE(realview_smp, "arm,realview-smp", &realview_dt_smp_ops); |