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Commit 9e634cae authored by Linus Walleij's avatar Linus Walleij
Browse files

ARM: ux500: simplify secondary boot 



Inline the wakeup_secondary() static function, and keep the
backupram remapping around: it is reused when resuming from
suspend so no point in remapping it every time.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 7ce7d89f

arch/arm/mach-ux500/platsmp.c

+19 −26
Original line number Diff line number Diff line
@@ -31,10 +31,14 @@ 
#define UX500_CPU1_JUMPADDR_OFFSET 0x1FF4

#define UX500_CPU1_WAKEMAGIC_OFFSET 0x1FF0



static void wakeup_secondary(void)

static void __iomem *backupram;



static void __init ux500_smp_prepare_cpus(unsigned int max_cpus)

{

	struct device_node *np;

	static void __iomem *backupram;

	static void __iomem *scu_base;

	unsigned int ncores;

	int i;



	np = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram");

	if (!np) {
@@ -48,29 +52,6 @@ static void wakeup_secondary(void) 
		return;

	}



	/*

	 * write the address of secondary startup into the backup ram register

	 * at offset 0x1FF4, then write the magic number 0xA1FEED01 to the

	 * backup ram register at offset 0x1FF0, which is what boot rom code

	 * is waiting for. This will wake up the secondary core from WFE.

	 */

	writel(virt_to_phys(secondary_startup),

	       backupram + UX500_CPU1_JUMPADDR_OFFSET);

	writel(0xA1FEED01,

	       backupram + UX500_CPU1_WAKEMAGIC_OFFSET);



	/* make sure write buffer is drained */

	mb();

	iounmap(backupram);

}



static void __init ux500_smp_prepare_cpus(unsigned int max_cpus)

{

	struct device_node *np;

	static void __iomem *scu_base;

	unsigned int ncores;

	int i;



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

	if (!np) {

		pr_err("No SCU base address\n");
@@ -92,7 +73,19 @@ static void __init ux500_smp_prepare_cpus(unsigned int max_cpus) 


static int ux500_boot_secondary(unsigned int cpu, struct task_struct *idle)

{

	wakeup_secondary();

	/*

	 * write the address of secondary startup into the backup ram register

	 * at offset 0x1FF4, then write the magic number 0xA1FEED01 to the

	 * backup ram register at offset 0x1FF0, which is what boot rom code

	 * is waiting for. This will wake up the secondary core from WFE.

	 */

	writel(virt_to_phys(secondary_startup),

	       backupram + UX500_CPU1_JUMPADDR_OFFSET);

	writel(0xA1FEED01,

	       backupram + UX500_CPU1_WAKEMAGIC_OFFSET);



	/* make sure write buffer is drained */

	mb();

	arch_send_wakeup_ipi_mask(cpumask_of(cpu));

	return 0;

}