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authorImre Kaloz <kaloz@openwrt.org>2012-09-27 08:07:17 +0000
committerImre Kaloz <kaloz@openwrt.org>2012-09-27 08:07:17 +0000
commit68f8db67316914937e9a361a95e812218c01252a (patch)
tree162f1efd52540cea9654a46fc7768d313d62d84b
parent9ace6ace8f7d8317a2bcf3704127842197aff437 (diff)
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fix ncores for single-core systems.
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
-rw-r--r--target/linux/cns3xxx/patches-3.3/450-smp_ncores.patch109
1 files changed, 109 insertions, 0 deletions
diff --git a/target/linux/cns3xxx/patches-3.3/450-smp_ncores.patch b/target/linux/cns3xxx/patches-3.3/450-smp_ncores.patch
new file mode 100644
index 0000000000..c942a9b7e3
--- /dev/null
+++ b/target/linux/cns3xxx/patches-3.3/450-smp_ncores.patch
@@ -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