SPEAr13xx: Add source files

#

# SPEAr13XX Machine configuration file

#

if ARCH_SPEAR13XX

menu "SPEAr13xx Implementations"

config MACH_SPEAR1310

	bool "SPEAr1310 Machine support with Device Tree"

	help

	  Supports ST SPEAr1310 machine configured via the device-tree

config MACH_SPEAR1340

	bool "SPEAr1340 Machine support with Device Tree"

	help

	  Supports ST SPEAr1340 machine configured via the device-tree

endmenu

endif #ARCH_SPEAR13XX

#

# Makefile for SPEAr13XX machine series

#

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

obj-$(CONFIG_HOTPLUG_CPU)	+= hotplug.o

obj-$(CONFIG_ARCH_SPEAR13XX)	+= spear13xx.o

obj-$(CONFIG_MACH_SPEAR1310)	+= spear1310.o

obj-$(CONFIG_MACH_SPEAR1340)	+= spear1340.o

zreladdr-y	+= 0x00008000

params_phys-y	:= 0x00000100

initrd_phys-y	:= 0x00800000

dtb-$(CONFIG_MACH_SPEAR1310)	+= spear1310-evb.dtb

dtb-$(CONFIG_MACH_SPEAR1340)	+= spear1340-evb.dtb

/*

 * arch/arm/mach-spear13XX/headsmp.S

 *

 * Picked from realview

 * Copyright (c) 2012 ST Microelectronics Limited

 * Shiraz Hashim <shiraz.hashim@st.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/linkage.h>

#include <linux/init.h>

	__INIT

/*

 * spear13xx specific entry point for secondary CPUs. This provides

 * a "holding pen" into which all secondary cores are held until we're

 * ready for them to initialise.

 */

ENTRY(spear13xx_secondary_startup)

	mrc	p15, 0, r0, c0, c0, 5

	and	r0, r0, #15

	adr	r4, 1f

	ldmia	r4, {r5, r6}

	sub	r4, r4, r5

	add	r6, r6, r4

pen:	ldr	r7, [r6]

	cmp	r7, r0

	bne	pen

	/* re-enable coherency */

	mrc	p15, 0, r0, c1, c0, 1

	orr	r0, r0, #(1 << 6) | (1 << 0)

	mcr	p15, 0, r0, c1, c0, 1

	/*

	 * we've been released from the holding pen: secondary_stack

	 * should now contain the SVC stack for this core

	 */

	b	secondary_startup

	.align

1:	.long	.

	.long	pen_release

ENDPROC(spear13xx_secondary_startup)

/*

 * linux/arch/arm/mach-spear13xx/hotplug.c

 *

 * Copyright (C) 2012 ST Microelectronics Ltd.

 * Deepak Sikri <deepak.sikri@st.com>

 *

 * based upon linux/arch/arm/mach-realview/hotplug.c

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/smp.h>

#include <asm/cacheflush.h>

#include <asm/cp15.h>

#include <asm/smp_plat.h>

extern volatile int pen_release;

static inline void cpu_enter_lowpower(void)

{

	unsigned int v;

	flush_cache_all();

	asm volatile(

	"	mcr	p15, 0, %1, c7, c5, 0\n"

	"	dsb\n"

	/*

	 * Turn off coherency

	 */

	"	mrc	p15, 0, %0, c1, c0, 1\n"

	"	bic	%0, %0, #0x20\n"

	"	mcr	p15, 0, %0, c1, c0, 1\n"

	"	mrc	p15, 0, %0, c1, c0, 0\n"

	"	bic	%0, %0, %2\n"

	"	mcr	p15, 0, %0, c1, c0, 0\n"

	: "=&r" (v)

	: "r" (0), "Ir" (CR_C)

	: "cc", "memory");

}

static inline void cpu_leave_lowpower(void)

{

	unsigned int v;

	asm volatile("mrc	p15, 0, %0, c1, c0, 0\n"

	"	orr	%0, %0, %1\n"

	"	mcr	p15, 0, %0, c1, c0, 0\n"

	"	mrc	p15, 0, %0, c1, c0, 1\n"

	"	orr	%0, %0, #0x20\n"

	"	mcr	p15, 0, %0, c1, c0, 1\n"

	: "=&r" (v)

	: "Ir" (CR_C)

	: "cc");

}

static inline void platform_do_lowpower(unsigned int cpu, int *spurious)

{

	for (;;) {

		wfi();

		if (pen_release == cpu) {

			/*

			 * OK, proper wakeup, we're done

			 */

			break;

		}

		/*

		 * Getting here, means that we have come out of WFI without

		 * having been woken up - this shouldn't happen

		 *

		 * Just note it happening - when we're woken, we can report

		 * its occurrence.

		 */

		(*spurious)++;

	}

}

int platform_cpu_kill(unsigned int cpu)

{

	return 1;

}

/*

 * platform-specific code to shutdown a CPU

 *

 * Called with IRQs disabled

 */

void __cpuinit platform_cpu_die(unsigned int cpu)

{

	int spurious = 0;

	/*

	 * we're ready for shutdown now, so do it

	 */

	cpu_enter_lowpower();

	platform_do_lowpower(cpu, &spurious);

	/*

	 * bring this CPU back into the world of cache

	 * coherency, and then restore interrupts

	 */

	cpu_leave_lowpower();

	if (spurious)

		pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);

}

int platform_cpu_disable(unsigned int cpu)

{

	/*

	 * we don't allow CPU 0 to be shutdown (it is still too special

	 * e.g. clock tick interrupts)

	 */

	return cpu == 0 ? -EPERM : 0;

}