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Commit 4e3fea4a authored by Jingchang Lu's avatar Jingchang Lu Committed by Shawn Guo
Browse files

ARM: imx: Add Freescale LS1021A SMP support 



Freescale LS1021A SoCs deploy two cortex-A7 processors,
this adds bring-up support for the secondary core.

Signed-off-by: default avatarJingchang Lu <b35083@freescale.com>
Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
parent 7f0fb610

arch/arm/mach-imx/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -89,7 +89,7 @@ obj-$(CONFIG_HAVE_IMX_ANATOP) += anatop.o 
obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o

obj-$(CONFIG_HAVE_IMX_MMDC) += mmdc.o

obj-$(CONFIG_HAVE_IMX_SRC) += src.o

ifdef CONFIG_SOC_IMX6

ifneq ($(CONFIG_SOC_IMX6)$(CONFIG_SOC_LS1021A),)

AFLAGS_headsmp.o :=-Wa,-march=armv7-a

obj-$(CONFIG_SMP) += headsmp.o platsmp.o

obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o

arch/arm/mach-imx/common.h

+1 −0
Original line number Diff line number Diff line
@@ -158,5 +158,6 @@ static inline void imx_init_l2cache(void) {} 
#endif



extern struct smp_operations imx_smp_ops;

extern struct smp_operations ls1021a_smp_ops;



#endif

arch/arm/mach-imx/mach-ls1021a.c

+1 −0
Original line number Diff line number Diff line
@@ -17,5 +17,6 @@ static const char * const ls1021a_dt_compat[] __initconst = { 
};



DT_MACHINE_START(LS1021A, "Freescale LS1021A")

	.smp		= smp_ops(ls1021a_smp_ops),

	.dt_compat	= ls1021a_dt_compat,

MACHINE_END

arch/arm/mach-imx/platsmp.c

+33 −0
Original line number Diff line number Diff line
@@ -11,7 +11,10 @@ 
 */



#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>
@@ -94,3 +97,33 @@ struct smp_operations imx_smp_ops __initdata = { 
	.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;

}



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);

}



struct smp_operations  ls1021a_smp_ops __initdata = {

	.smp_prepare_cpus	= ls1021a_smp_prepare_cpus,

	.smp_boot_secondary	= ls1021a_boot_secondary,

};