mirror of https://gitee.com/openkylin/linux.git
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
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* Copyright 2011 Freescale Semiconductor, Inc.
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* Copyright 2011 Linaro Ltd.
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <asm/cacheflush.h>
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#include <asm/page.h>
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#include <asm/smp_scu.h>
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#include <asm/mach/map.h>
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#include "common.h"
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#include "hardware.h"
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#define SCU_STANDBY_ENABLE (1 << 5)
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u32 g_diag_reg;
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static void __iomem *scu_base;
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static struct map_desc scu_io_desc __initdata = {
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/* .virtual and .pfn are run-time assigned */
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.length = SZ_4K,
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.type = MT_DEVICE,
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};
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void __init imx_scu_map_io(void)
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{
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unsigned long base;
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/* Get SCU base */
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asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
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scu_io_desc.virtual = IMX_IO_P2V(base);
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scu_io_desc.pfn = __phys_to_pfn(base);
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iotable_init(&scu_io_desc, 1);
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scu_base = IMX_IO_ADDRESS(base);
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}
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void imx_scu_standby_enable(void)
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{
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u32 val = readl_relaxed(scu_base);
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val |= SCU_STANDBY_ENABLE;
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writel_relaxed(val, scu_base);
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}
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static int __cpuinit imx_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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imx_set_cpu_jump(cpu, v7_secondary_startup);
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imx_enable_cpu(cpu, true);
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return 0;
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}
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/*
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* Initialise the CPU possible map early - this describes the CPUs
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* which may be present or become present in the system.
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*/
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static void __init imx_smp_init_cpus(void)
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{
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int i, ncores;
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ncores = scu_get_core_count(scu_base);
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for (i = ncores; i < NR_CPUS; i++)
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set_cpu_possible(i, false);
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}
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void imx_smp_prepare(void)
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{
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scu_enable(scu_base);
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}
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static void __init imx_smp_prepare_cpus(unsigned int max_cpus)
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{
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imx_smp_prepare();
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/*
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* The diagnostic register holds the errata bits. Mostly bootloader
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* does not bring up secondary cores, so that when errata bits are set
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* in bootloader, they are set only for boot cpu. But on a SMP
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* configuration, it should be equally done on every single core.
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* Read the register from boot cpu here, and will replicate it into
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* secondary cores when booting them.
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*/
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asm("mrc p15, 0, %0, c15, c0, 1" : "=r" (g_diag_reg) : : "cc");
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__cpuc_flush_dcache_area(&g_diag_reg, sizeof(g_diag_reg));
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outer_clean_range(__pa(&g_diag_reg), __pa(&g_diag_reg + 1));
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}
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struct smp_operations imx_smp_ops __initdata = {
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.smp_init_cpus = imx_smp_init_cpus,
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.smp_prepare_cpus = imx_smp_prepare_cpus,
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.smp_boot_secondary = imx_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = imx_cpu_die,
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.cpu_kill = imx_cpu_kill,
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#endif
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};
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