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Commit 7bd1584b authored by Olof Johansson's avatar Olof Johansson
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Merge tag 'sti-soc-for-v4.3-1' of... 

Merge tag 'sti-soc-for-v4.3-1' of https://git.kernel.org/pub/scm/linux/kernel/git/mcoquelin/sti into next/soc

STi SoC updates for v4.3, round 1.

Highlights:
-----------
 - Add code to release secondary cores from holding pen.
 - Remove useless call to trace_hardirqs_off() in secondary core init function.

* tag 'sti-soc-for-v4.3-1' of https://git.kernel.org/pub/scm/linux/kernel/git/mcoquelin/sti

:
  ARM: STi: Remove platform call to trace_hardirqs_off()
  ARM: STi: Add code to release secondary cores from holding pen.

Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parents d7030a08 50de4dd4

arch/arm/mach-sti/headsmp.S

+1 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ pen: ldr r7, [r6] 
	 * should now contain the SVC stack for this core

	 */

	b	secondary_startup

ENDPROC(sti_secondary_startup)



1:	.long	.

	.long	pen_release

arch/arm/mach-sti/platsmp.c

+52 −5
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/memblock.h>



#include <asm/cacheflush.h>

#include <asm/smp_plat.h>
@@ -38,8 +39,6 @@ static DEFINE_SPINLOCK(boot_lock); 


static void sti_secondary_init(unsigned int cpu)

{

	trace_hardirqs_off();



	/*

	 * let the primary processor know we're out of the

	 * pen, then head off into the C entry point
@@ -99,14 +98,62 @@ static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle) 


static void __init sti_smp_prepare_cpus(unsigned int max_cpus)

{

	void __iomem *scu_base = NULL;

	struct device_node *np = of_find_compatible_node(

					NULL, NULL, "arm,cortex-a9-scu");

	struct device_node *np;

	void __iomem *scu_base;

	u32 __iomem *cpu_strt_ptr;

	u32 release_phys;

	int cpu;

	unsigned long entry_pa = virt_to_phys(sti_secondary_startup);



	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");



	if (np) {

		scu_base = of_iomap(np, 0);

		scu_enable(scu_base);

		of_node_put(np);

	}



	if (max_cpus <= 1)

		return;



	for_each_possible_cpu(cpu) {



		np = of_get_cpu_node(cpu, NULL);



		if (!np)

			continue;



		if (of_property_read_u32(np, "cpu-release-addr",

						&release_phys)) {

			pr_err("CPU %d: missing or invalid cpu-release-addr "

				"property\n", cpu);

			continue;

		}



		/*

		 * holding pen is usually configured in SBC DMEM but can also be

		 * in RAM.

		 */



		if (!memblock_is_memory(release_phys))

			cpu_strt_ptr =

				ioremap(release_phys, sizeof(release_phys));

		else

			cpu_strt_ptr =

				(u32 __iomem *)phys_to_virt(release_phys);



		__raw_writel(entry_pa, cpu_strt_ptr);



		/*

		 * wmb so that data is actually written

		 * before cache flush is done

		 */

		smp_wmb();

		sync_cache_w(cpu_strt_ptr);



		if (!memblock_is_memory(release_phys))

			iounmap(cpu_strt_ptr);

	}

}



struct smp_operations __initdata sti_smp_ops = {

arch/arm/mach-sti/smp.h

+2 −0
Original line number Diff line number Diff line
@@ -14,4 +14,6 @@ 


extern struct smp_operations	sti_smp_ops;



void sti_secondary_startup(void);



#endif