2 * linux/arch/arm/mach-vexpress/platsmp.c
4 * Copyright (C) 2002 ARM Ltd.
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.
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/smp.h>
15 #include <linux/of_fdt.h>
16 #include <linux/vexpress.h>
18 #include <asm/smp_scu.h>
19 #include <asm/hardware/gic.h>
20 #include <asm/mach/map.h>
22 #include <mach/motherboard.h>
24 #include <plat/platsmp.h>
28 #if defined(CONFIG_OF)
33 } vexpress_dt_scu __initdata = GENERIC_SCU;
35 static struct map_desc vexpress_dt_cortex_a9_scu_map __initdata = {
36 .virtual = V2T_PERIPH,
37 /* .pfn set in vexpress_dt_init_cortex_a9_scu() */
42 static void *vexpress_dt_cortex_a9_scu_base __initdata;
44 const static char *vexpress_dt_cortex_a9_match[] __initconst = {
50 static int __init vexpress_dt_find_scu(unsigned long node,
51 const char *uname, int depth, void *data)
53 if (of_flat_dt_match(node, vexpress_dt_cortex_a9_match)) {
54 phys_addr_t phys_addr;
55 __be32 *reg = of_get_flat_dt_prop(node, "reg", NULL);
60 phys_addr = be32_to_cpup(reg);
61 vexpress_dt_scu = CORTEX_A9_SCU;
63 vexpress_dt_cortex_a9_scu_map.pfn = __phys_to_pfn(phys_addr);
64 iotable_init(&vexpress_dt_cortex_a9_scu_map, 1);
65 vexpress_dt_cortex_a9_scu_base = ioremap(phys_addr, SZ_256);
66 if (WARN_ON(!vexpress_dt_cortex_a9_scu_base))
73 void __init vexpress_dt_smp_map_io(void)
75 if (initial_boot_params)
76 WARN_ON(of_scan_flat_dt(vexpress_dt_find_scu, NULL));
79 static int __init vexpress_dt_cpus_num(unsigned long node, const char *uname,
80 int depth, void *data)
82 static int prev_depth = -1;
83 static int nr_cpus = -1;
85 if (prev_depth > depth && nr_cpus > 0)
88 if (nr_cpus < 0 && strcmp(uname, "cpus") == 0)
92 const char *device_type = of_get_flat_dt_prop(node,
95 if (device_type && strcmp(device_type, "cpu") == 0)
104 static void __init vexpress_dt_smp_init_cpus(void)
108 switch (vexpress_dt_scu) {
110 ncores = of_scan_flat_dt(vexpress_dt_cpus_num, NULL);
113 ncores = scu_get_core_count(vexpress_dt_cortex_a9_scu_base);
123 if (ncores > nr_cpu_ids) {
124 pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
129 for (i = 0; i < ncores; ++i)
130 set_cpu_possible(i, true);
132 set_smp_cross_call(gic_raise_softirq);
135 static void __init vexpress_dt_smp_prepare_cpus(unsigned int max_cpus)
139 switch (vexpress_dt_scu) {
141 for (i = 0; i < max_cpus; i++)
142 set_cpu_present(i, true);
145 scu_enable(vexpress_dt_cortex_a9_scu_base);
155 static void __init vexpress_dt_smp_init_cpus(void)
160 void __init vexpress_dt_smp_prepare_cpus(unsigned int max_cpus)
168 * Initialise the CPU possible map early - this describes the CPUs
169 * which may be present or become present in the system.
171 static void __init vexpress_smp_init_cpus(void)
174 ct_desc->init_cpu_map();
176 vexpress_dt_smp_init_cpus();
180 static void __init vexpress_smp_prepare_cpus(unsigned int max_cpus)
183 * Initialise the present map, which describes the set of CPUs
184 * actually populated at the present time.
187 ct_desc->smp_enable(max_cpus);
189 vexpress_dt_smp_prepare_cpus(max_cpus);
192 * Write the address of secondary startup into the
193 * system-wide flags register. The boot monitor waits
194 * until it receives a soft interrupt, and then the
195 * secondary CPU branches to this address.
197 vexpress_flags_set(virt_to_phys(versatile_secondary_startup));
200 struct smp_operations __initdata vexpress_smp_ops = {
201 .smp_init_cpus = vexpress_smp_init_cpus,
202 .smp_prepare_cpus = vexpress_smp_prepare_cpus,
203 .smp_secondary_init = versatile_secondary_init,
204 .smp_boot_secondary = versatile_boot_secondary,
205 #ifdef CONFIG_HOTPLUG_CPU
206 .cpu_die = vexpress_cpu_die,