2 * Copyright 2011 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
13 #include <linux/init.h>
14 #include <linux/smp.h>
16 #include <asm/smp_scu.h>
17 #include <asm/mach/map.h>
22 #define SCU_STANDBY_ENABLE (1 << 5)
24 static void __iomem *scu_base;
26 static struct map_desc scu_io_desc __initdata = {
27 /* .virtual and .pfn are run-time assigned */
32 void __init imx_scu_map_io(void)
37 asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
39 scu_io_desc.virtual = IMX_IO_P2V(base);
40 scu_io_desc.pfn = __phys_to_pfn(base);
41 iotable_init(&scu_io_desc, 1);
43 scu_base = IMX_IO_ADDRESS(base);
46 void imx_scu_standby_enable(void)
48 u32 val = readl_relaxed(scu_base);
50 val |= SCU_STANDBY_ENABLE;
51 writel_relaxed(val, scu_base);
54 static int __cpuinit imx_boot_secondary(unsigned int cpu, struct task_struct *idle)
56 imx_set_cpu_jump(cpu, v7_secondary_startup);
57 imx_enable_cpu(cpu, true);
62 * Initialise the CPU possible map early - this describes the CPUs
63 * which may be present or become present in the system.
65 static void __init imx_smp_init_cpus(void)
69 ncores = scu_get_core_count(scu_base);
71 for (i = ncores; i < NR_CPUS; i++)
72 set_cpu_possible(i, false);
75 void imx_smp_prepare(void)
80 static void __init imx_smp_prepare_cpus(unsigned int max_cpus)
85 struct smp_operations imx_smp_ops __initdata = {
86 .smp_init_cpus = imx_smp_init_cpus,
87 .smp_prepare_cpus = imx_smp_prepare_cpus,
88 .smp_boot_secondary = imx_boot_secondary,
89 #ifdef CONFIG_HOTPLUG_CPU
90 .cpu_die = imx_cpu_die,
91 .cpu_kill = imx_cpu_kill,