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From: magnus.damm@gmail.com (Magnus Damm)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: shmobile: Check r8a7791 MD21 at SMP boot
Date: Wed, 26 Feb 2014 18:59:16 +0900	[thread overview]
Message-ID: <20140226095916.15676.99394.sendpatchset@w520> (raw)

From: Magnus Damm <damm@opensource.se>

On r8a7791 the hardware boot mode bit MD21 indicates if hardware
debug mode is enabled or not. In case hardware debug mode is enabled
print a warning and refrain from booting secondary CPU cores.

Without this patch Koelsch with SW8-4 set to OFF will hang at SMP boot.

Signed-off-by: Magnus Damm <damm@opensource.se>
---

 This is a reworked version of the APMU patch previously posted as
 [PATCH] ARM: shmobile: Check MD21 at SMP boot in case of APMU

 Written against renesas-devel-v3.14-rc4-20140226

 arch/arm/mach-shmobile/smp-r8a7791.c |   15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

--- 0001/arch/arm/mach-shmobile/smp-r8a7791.c
+++ work/arch/arm/mach-shmobile/smp-r8a7791.c	2014-02-26 18:49:39.000000000 +0900
@@ -20,6 +20,7 @@
 #include <asm/smp_plat.h>
 #include <mach/common.h>
 #include <mach/r8a7791.h>
+#include <mach/rcar-gen2.h>
 
 #define RST		0xe6160000
 #define CA15BAR		0x0020
@@ -51,9 +52,21 @@ static void __init r8a7791_smp_prepare_c
 	iounmap(p);
 }
 
+static int r8a7791_smp_boot_secondary(unsigned int cpu,
+				      struct task_struct *idle)
+{
+	/* Error out when hardware debug mode is enabled */
+	if (rcar_gen2_read_mode_pins() & BIT(21)) {
+		pr_warn("Unable to boot CPU%u when MD21 is set\n", cpu);
+		return -ENOTSUPP;
+	}
+
+	return shmobile_smp_apmu_boot_secondary(cpu, idle);
+}
+
 struct smp_operations r8a7791_smp_ops __initdata = {
 	.smp_prepare_cpus	= r8a7791_smp_prepare_cpus,
-	.smp_boot_secondary	= shmobile_smp_apmu_boot_secondary,
+	.smp_boot_secondary	= r8a7791_smp_boot_secondary,
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_disable		= shmobile_smp_cpu_disable,
 	.cpu_die		= shmobile_smp_apmu_cpu_die,

             reply	other threads:[~2014-02-26  9:59 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-26  9:59 Magnus Damm [this message]
2014-02-26 10:11 ` [PATCH] ARM: shmobile: Check r8a7791 MD21 at SMP boot Geert Uytterhoeven
2014-02-27  3:33   ` Magnus Damm
2014-02-27  8:08     ` Geert Uytterhoeven
2014-03-13  2:02       ` Simon Horman
2014-03-13  4:59         ` Magnus Damm

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