mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
f45913fde0
We have a handy macro to replace open coded __cpuc_flush_dcache_area(() and outer_clean_range() sequences. Let's use it. No functional change. Signed-off-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Olof Johansson <olof@lixom.net>
107 lines
2.5 KiB
C
107 lines
2.5 KiB
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/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"
|
|
|
|
#define SCU_STANDBY_ENABLE (1 << 5)
|
|
|
|
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);
|
|
}
|
|
|
|
void imx_scu_standby_enable(void)
|
|
{
|
|
u32 val = readl_relaxed(scu_base);
|
|
|
|
val |= SCU_STANDBY_ENABLE;
|
|
writel_relaxed(val, scu_base);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
void imx_smp_prepare(void)
|
|
{
|
|
scu_enable(scu_base);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
struct smp_operations imx_smp_ops __initdata = {
|
|
.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
|
|
};
|