Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 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> |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 13 | #include <linux/smp.h> |
| 14 | #include <linux/io.h> |
Pawel Moll | 95d5974 | 2012-02-24 09:18:14 +0000 | [diff] [blame] | 15 | #include <linux/of_fdt.h> |
| 16 | |
| 17 | #include <asm/smp_scu.h> |
| 18 | #include <asm/hardware/gic.h> |
| 19 | #include <asm/mach/map.h> |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 20 | |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 21 | #include <mach/motherboard.h> |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 22 | |
Marc Zyngier | 3695adc | 2011-09-08 13:15:22 +0100 | [diff] [blame] | 23 | #include <plat/platsmp.h> |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 24 | |
Marc Zyngier | 3695adc | 2011-09-08 13:15:22 +0100 | [diff] [blame] | 25 | #include "core.h" |
Russell King | 3705ff6 | 2010-12-18 10:53:12 +0000 | [diff] [blame] | 26 | |
Pawel Moll | 95d5974 | 2012-02-24 09:18:14 +0000 | [diff] [blame] | 27 | #if defined(CONFIG_OF) |
| 28 | |
| 29 | static enum { |
| 30 | GENERIC_SCU, |
| 31 | CORTEX_A9_SCU, |
| 32 | } vexpress_dt_scu __initdata = GENERIC_SCU; |
| 33 | |
| 34 | static struct map_desc vexpress_dt_cortex_a9_scu_map __initdata = { |
| 35 | .virtual = V2T_PERIPH, |
| 36 | /* .pfn set in vexpress_dt_init_cortex_a9_scu() */ |
| 37 | .length = SZ_128, |
| 38 | .type = MT_DEVICE, |
| 39 | }; |
| 40 | |
| 41 | static void *vexpress_dt_cortex_a9_scu_base __initdata; |
| 42 | |
| 43 | const static char *vexpress_dt_cortex_a9_match[] __initconst = { |
| 44 | "arm,cortex-a5-scu", |
| 45 | "arm,cortex-a9-scu", |
| 46 | NULL |
| 47 | }; |
| 48 | |
| 49 | static int __init vexpress_dt_find_scu(unsigned long node, |
| 50 | const char *uname, int depth, void *data) |
| 51 | { |
| 52 | if (of_flat_dt_match(node, vexpress_dt_cortex_a9_match)) { |
| 53 | phys_addr_t phys_addr; |
| 54 | __be32 *reg = of_get_flat_dt_prop(node, "reg", NULL); |
| 55 | |
| 56 | if (WARN_ON(!reg)) |
| 57 | return -EINVAL; |
| 58 | |
| 59 | phys_addr = be32_to_cpup(reg); |
| 60 | vexpress_dt_scu = CORTEX_A9_SCU; |
| 61 | |
| 62 | vexpress_dt_cortex_a9_scu_map.pfn = __phys_to_pfn(phys_addr); |
| 63 | iotable_init(&vexpress_dt_cortex_a9_scu_map, 1); |
| 64 | vexpress_dt_cortex_a9_scu_base = ioremap(phys_addr, SZ_256); |
| 65 | if (WARN_ON(!vexpress_dt_cortex_a9_scu_base)) |
| 66 | return -EFAULT; |
| 67 | } |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | void __init vexpress_dt_smp_map_io(void) |
| 73 | { |
| 74 | if (initial_boot_params) |
| 75 | WARN_ON(of_scan_flat_dt(vexpress_dt_find_scu, NULL)); |
| 76 | } |
| 77 | |
| 78 | static int __init vexpress_dt_cpus_num(unsigned long node, const char *uname, |
| 79 | int depth, void *data) |
| 80 | { |
| 81 | static int prev_depth = -1; |
| 82 | static int nr_cpus = -1; |
| 83 | |
| 84 | if (prev_depth > depth && nr_cpus > 0) |
| 85 | return nr_cpus; |
| 86 | |
| 87 | if (nr_cpus < 0 && strcmp(uname, "cpus") == 0) |
| 88 | nr_cpus = 0; |
| 89 | |
| 90 | if (nr_cpus >= 0) { |
| 91 | const char *device_type = of_get_flat_dt_prop(node, |
| 92 | "device_type", NULL); |
| 93 | |
| 94 | if (device_type && strcmp(device_type, "cpu") == 0) |
| 95 | nr_cpus++; |
| 96 | } |
| 97 | |
| 98 | prev_depth = depth; |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | static void __init vexpress_dt_smp_init_cpus(void) |
| 104 | { |
| 105 | int ncores = 0, i; |
| 106 | |
| 107 | switch (vexpress_dt_scu) { |
| 108 | case GENERIC_SCU: |
| 109 | ncores = of_scan_flat_dt(vexpress_dt_cpus_num, NULL); |
| 110 | break; |
| 111 | case CORTEX_A9_SCU: |
| 112 | ncores = scu_get_core_count(vexpress_dt_cortex_a9_scu_base); |
| 113 | break; |
| 114 | default: |
| 115 | WARN_ON(1); |
| 116 | break; |
| 117 | } |
| 118 | |
| 119 | if (ncores < 2) |
| 120 | return; |
| 121 | |
| 122 | if (ncores > nr_cpu_ids) { |
| 123 | pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", |
| 124 | ncores, nr_cpu_ids); |
| 125 | ncores = nr_cpu_ids; |
| 126 | } |
| 127 | |
| 128 | for (i = 0; i < ncores; ++i) |
| 129 | set_cpu_possible(i, true); |
| 130 | |
| 131 | set_smp_cross_call(gic_raise_softirq); |
| 132 | } |
| 133 | |
| 134 | static void __init vexpress_dt_smp_prepare_cpus(unsigned int max_cpus) |
| 135 | { |
| 136 | int i; |
| 137 | |
| 138 | switch (vexpress_dt_scu) { |
| 139 | case GENERIC_SCU: |
| 140 | for (i = 0; i < max_cpus; i++) |
| 141 | set_cpu_present(i, true); |
| 142 | break; |
| 143 | case CORTEX_A9_SCU: |
| 144 | scu_enable(vexpress_dt_cortex_a9_scu_base); |
| 145 | break; |
| 146 | default: |
| 147 | WARN_ON(1); |
| 148 | break; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | #else |
| 153 | |
| 154 | static void __init vexpress_dt_smp_init_cpus(void) |
| 155 | { |
| 156 | WARN_ON(1); |
| 157 | } |
| 158 | |
| 159 | void __init vexpress_dt_smp_prepare_cpus(unsigned int max_cpus) |
| 160 | { |
| 161 | WARN_ON(1); |
| 162 | } |
| 163 | |
| 164 | #endif |
| 165 | |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 166 | /* |
| 167 | * Initialise the CPU possible map early - this describes the CPUs |
| 168 | * which may be present or become present in the system. |
| 169 | */ |
Marc Zyngier | 3695adc | 2011-09-08 13:15:22 +0100 | [diff] [blame] | 170 | static void __init vexpress_smp_init_cpus(void) |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 171 | { |
Pawel Moll | 95d5974 | 2012-02-24 09:18:14 +0000 | [diff] [blame] | 172 | if (ct_desc) |
| 173 | ct_desc->init_cpu_map(); |
| 174 | else |
| 175 | vexpress_dt_smp_init_cpus(); |
| 176 | |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 177 | } |
| 178 | |
Marc Zyngier | 3695adc | 2011-09-08 13:15:22 +0100 | [diff] [blame] | 179 | static void __init vexpress_smp_prepare_cpus(unsigned int max_cpus) |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 180 | { |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 181 | /* |
| 182 | * Initialise the present map, which describes the set of CPUs |
| 183 | * actually populated at the present time. |
| 184 | */ |
Pawel Moll | 95d5974 | 2012-02-24 09:18:14 +0000 | [diff] [blame] | 185 | if (ct_desc) |
| 186 | ct_desc->smp_enable(max_cpus); |
| 187 | else |
| 188 | vexpress_dt_smp_prepare_cpus(max_cpus); |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 189 | |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 190 | /* |
Russell King | 05c74a6 | 2010-12-03 11:09:48 +0000 | [diff] [blame] | 191 | * Write the address of secondary startup into the |
| 192 | * system-wide flags register. The boot monitor waits |
| 193 | * until it receives a soft interrupt, and then the |
| 194 | * secondary CPU branches to this address. |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 195 | */ |
Pawel Moll | 98ed4ce | 2012-01-25 15:37:29 +0000 | [diff] [blame] | 196 | v2m_flags_set(virt_to_phys(versatile_secondary_startup)); |
Russell King | 59ac59f | 2010-02-11 21:56:07 +0000 | [diff] [blame] | 197 | } |
Marc Zyngier | 3695adc | 2011-09-08 13:15:22 +0100 | [diff] [blame] | 198 | |
| 199 | struct smp_operations __initdata vexpress_smp_ops = { |
| 200 | .smp_init_cpus = vexpress_smp_init_cpus, |
| 201 | .smp_prepare_cpus = vexpress_smp_prepare_cpus, |
| 202 | .smp_secondary_init = versatile_secondary_init, |
| 203 | .smp_boot_secondary = versatile_boot_secondary, |
| 204 | #ifdef CONFIG_HOTPLUG_CPU |
| 205 | .cpu_die = vexpress_cpu_die, |
| 206 | #endif |
| 207 | }; |