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fix ncores for single-core systems.

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For cns3xxx SCU_CONFIGURATION always shows multipe cores but SCU_CPU_STATUS
shows which ones are active.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

SVN-Revision: 33566
This commit is contained in:
Imre Kaloz 2012-09-27 08:07:17 +00:00
parent 9ace6ace8f
commit 68f8db6731
1 changed files with 109 additions and 0 deletions
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109
target/linux/cns3xxx/patches-3.3/450-smp_ncores.patch Normal file
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@ -0,0 +1,109 @@
--- a/arch/arm/mach-cns3xxx/platsmp.c
+++ b/arch/arm/mach-cns3xxx/platsmp.c
@@ -1,18 +1,17 @@
-/* linux/arch/arm/mach-cns3xxx/platsmp.c
+/*
+ * linux/arch/arm/mach-cns3xxx/platsmp.c
*
- * Copyright 2011 Gateworks Corporation
+ * Copyright (C) 2002 ARM Ltd.
+ * Copyright 2012 Gateworks Corporation
* Chris Lang <clang@gateworks.com>
+ * Tim Harvey <tharvey@gateworks.com>
*
- * Cloned from linux/arch/arm/mach-vexpress/platsmp.c
- *
- * Copyright (C) 2002 ARM Ltd.
* All Rights Reserved
*
* 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/init.h>
#include <linux/errno.h>
#include <linux/delay.h>
@@ -30,11 +29,13 @@
extern void cns3xxx_secondary_startup(void);
+#define SCU_CPU_STATUS 0x08
+static void __iomem *scu_base;
+
/*
* control for which core is the next to come out of the secondary
* boot "holding pen"
*/
-
volatile int __cpuinitdata pen_release = -1;
/*
@@ -50,11 +51,6 @@ static void write_pen_release(int val)
outer_clean_range(__pa(&pen_release), __pa(&pen_release + 1));
}
-static void __iomem *scu_base_addr(void)
-{
- return (void __iomem *)(CNS3XXX_TC11MP_SCU_BASE_VIRT);
-}
-
static DEFINE_SPINLOCK(boot_lock);
void __cpuinit platform_secondary_init(unsigned int cpu)
@@ -128,25 +124,24 @@ int __cpuinit boot_secondary(unsigned in
* Initialise the CPU possible map early - this describes the CPUs
* which may be present or become present in the system.
*/
-
void __init smp_init_cpus(void)
{
- void __iomem *scu_base = scu_base_addr();
unsigned int i, ncores;
+ unsigned int status;
- ncores = scu_base ? scu_get_core_count(scu_base) : 1;
+ scu_base = (void __iomem *) CNS3XXX_TC11MP_SCU_BASE_VIRT;
- /* sanity check */
- if (ncores > NR_CPUS) {
- printk(KERN_WARNING
- "cns3xxx: no. of cores (%d) greater than configured "
- "maximum of %d - clipping\n",
- ncores, NR_CPUS);
- ncores = NR_CPUS;
+ /* for CNS3xxx SCU_CPU_STATUS must be examined instead of SCU_CONFIGURATION
+ * used in scu_get_core_count
+ */
+ status = __raw_readl(scu_base + SCU_CPU_STATUS);
+ for (i = 0; i < NR_CPUS+1; i++) {
+ if (((status >> (i*2)) & 0x3) == 0)
+ set_cpu_possible(i, true);
+ else
+ break;
}
-
- for (i = 0; i < ncores; i++)
- set_cpu_possible(i, true);
+ ncores = i;
set_smp_cross_call(gic_raise_softirq);
}
@@ -159,10 +154,14 @@ void __init platform_smp_prepare_cpus(un
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
- for (i = 0; i < max_cpus; i++)
+ for (i = 0; i < max_cpus; i++) {
set_cpu_present(i, true);
+ }
- scu_enable(scu_base_addr());
+ /*
+ * enable SCU
+ */
+ scu_enable(scu_base);
/*
* Write the address of secondary startup into the