diff options
Diffstat (limited to 'target/linux/cns3xxx/patches-3.3/450-smp_ncores.patch')
| -rw-r--r-- | target/linux/cns3xxx/patches-3.3/450-smp_ncores.patch | 109 |
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 000000000..c942a9b7e --- /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 |