Release 4.10 arch/arm/mach-imx/platsmp.c
/*
* Copyright 2011 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/init.h>
#include <linux/of_address.h>
#include <linux/of.h>
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/page.h>
#include <asm/smp_scu.h>
#include <asm/mach/map.h>
#include "common.h"
#include "hardware.h"
u32 g_diag_reg;
static void __iomem *scu_base;
static struct map_desc scu_io_desc __initdata = {
/* .virtual and .pfn are run-time assigned */
.length = SZ_4K,
.type = MT_DEVICE,
};
void __init imx_scu_map_io(void)
{
unsigned long base;
/* Get SCU base */
asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
scu_io_desc.virtual = IMX_IO_P2V(base);
scu_io_desc.pfn = __phys_to_pfn(base);
iotable_init(&scu_io_desc, 1);
scu_base = IMX_IO_ADDRESS(base);
}
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static int imx_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
imx_set_cpu_jump(cpu, v7_secondary_startup);
imx_enable_cpu(cpu, true);
return 0;
}
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/*
* Initialise the CPU possible map early - this describes the CPUs
* which may be present or become present in the system.
*/
static void __init imx_smp_init_cpus(void)
{
int i, ncores;
ncores = scu_get_core_count(scu_base);
for (i = ncores; i < NR_CPUS; i++)
set_cpu_possible(i, false);
}
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void imx_smp_prepare(void)
{
scu_enable(scu_base);
}
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static void __init imx_smp_prepare_cpus(unsigned int max_cpus)
{
imx_smp_prepare();
/*
* The diagnostic register holds the errata bits. Mostly bootloader
* does not bring up secondary cores, so that when errata bits are set
* in bootloader, they are set only for boot cpu. But on a SMP
* configuration, it should be equally done on every single core.
* Read the register from boot cpu here, and will replicate it into
* secondary cores when booting them.
*/
asm("mrc p15, 0, %0, c15, c0, 1" : "=r" (g_diag_reg) : : "cc");
sync_cache_w(&g_diag_reg);
}
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const struct smp_operations imx_smp_ops __initconst = {
.smp_init_cpus = imx_smp_init_cpus,
.smp_prepare_cpus = imx_smp_prepare_cpus,
.smp_boot_secondary = imx_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_die = imx_cpu_die,
.cpu_kill = imx_cpu_kill,
#endif
};
#define DCFG_CCSR_SCRATCHRW1 0x200
static int ls1021a_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
arch_send_wakeup_ipi_mask(cpumask_of(cpu));
return 0;
}
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static void __init ls1021a_smp_prepare_cpus(unsigned int max_cpus)
{
struct device_node *np;
void __iomem *dcfg_base;
unsigned long paddr;
np = of_find_compatible_node(NULL, NULL, "fsl,ls1021a-dcfg");
dcfg_base = of_iomap(np, 0);
BUG_ON(!dcfg_base);
paddr = virt_to_phys(secondary_startup);
writel_relaxed(cpu_to_be32(paddr), dcfg_base + DCFG_CCSR_SCRATCHRW1);
iounmap(dcfg_base);
}
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const struct smp_operations ls1021a_smp_ops __initconst = {
.smp_prepare_cpus = ls1021a_smp_prepare_cpus,
.smp_boot_secondary = ls1021a_boot_secondary,
};
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