| /* |
| * SMP support for Emma Mobile EV2 |
| * |
| * Copyright (C) 2012 Renesas Solutions Corp. |
| * Copyright (C) 2012 Magnus Damm |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/smp.h> |
| #include <linux/spinlock.h> |
| #include <linux/io.h> |
| #include <linux/delay.h> |
| #include <mach/common.h> |
| #include <mach/emev2.h> |
| #include <asm/smp_plat.h> |
| #include <asm/smp_scu.h> |
| #include <asm/hardware/gic.h> |
| #include <asm/cacheflush.h> |
| |
| #define EMEV2_SCU_BASE 0x1e000000 |
| |
| static void __iomem *scu_base; |
| |
| static unsigned int __init emev2_get_core_count(void) |
| { |
| if (!scu_base) { |
| scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE); |
| emev2_clock_init(); /* need ioremapped SMU */ |
| } |
| |
| WARN_ON_ONCE(!scu_base); |
| |
| return scu_base ? scu_get_core_count(scu_base) : 1; |
| } |
| |
| static int emev2_platform_cpu_kill(unsigned int cpu) |
| { |
| return 0; /* not supported yet */ |
| } |
| |
| static int __maybe_unused emev2_cpu_kill(unsigned int cpu) |
| { |
| int k; |
| |
| /* this function is running on another CPU than the offline target, |
| * here we need wait for shutdown code in platform_cpu_die() to |
| * finish before asking SoC-specific code to power off the CPU core. |
| */ |
| for (k = 0; k < 1000; k++) { |
| if (shmobile_cpu_is_dead(cpu)) |
| return emev2_platform_cpu_kill(cpu); |
| mdelay(1); |
| } |
| |
| return 0; |
| } |
| |
| |
| static void __cpuinit emev2_secondary_init(unsigned int cpu) |
| { |
| gic_secondary_init(0); |
| } |
| |
| static int __cpuinit emev2_boot_secondary(unsigned int cpu, struct task_struct *idle) |
| { |
| cpu = cpu_logical_map(cpu); |
| |
| /* enable cache coherency */ |
| scu_power_mode(scu_base, 0); |
| |
| /* Tell ROM loader about our vector (in headsmp.S) */ |
| emev2_set_boot_vector(__pa(shmobile_secondary_vector)); |
| |
| gic_raise_softirq(cpumask_of(cpu), 0); |
| return 0; |
| } |
| |
| static void __init emev2_smp_prepare_cpus(unsigned int max_cpus) |
| { |
| scu_enable(scu_base); |
| |
| /* enable cache coherency on CPU0 */ |
| scu_power_mode(scu_base, 0); |
| } |
| |
| static void __init emev2_smp_init_cpus(void) |
| { |
| unsigned int ncores = emev2_get_core_count(); |
| |
| shmobile_smp_init_cpus(ncores); |
| } |
| |
| struct smp_operations emev2_smp_ops __initdata = { |
| .smp_init_cpus = emev2_smp_init_cpus, |
| .smp_prepare_cpus = emev2_smp_prepare_cpus, |
| .smp_secondary_init = emev2_secondary_init, |
| .smp_boot_secondary = emev2_boot_secondary, |
| #ifdef CONFIG_HOTPLUG_CPU |
| .cpu_kill = emev2_cpu_kill, |
| .cpu_die = shmobile_cpu_die, |
| .cpu_disable = shmobile_cpu_disable, |
| #endif |
| }; |