diff options
Diffstat (limited to 'target/linux/cns3xxx/patches/049-cns3xxx_smp_support.patch')
| -rw-r--r-- | target/linux/cns3xxx/patches/049-cns3xxx_smp_support.patch | 419 |
1 files changed, 419 insertions, 0 deletions
diff --git a/target/linux/cns3xxx/patches/049-cns3xxx_smp_support.patch b/target/linux/cns3xxx/patches/049-cns3xxx_smp_support.patch new file mode 100644 index 0000000000..cab192d912 --- /dev/null +++ b/target/linux/cns3xxx/patches/049-cns3xxx_smp_support.patch @@ -0,0 +1,419 @@ +--- a/arch/arm/mach-cns3xxx/Makefile ++++ b/arch/arm/mach-cns3xxx/Makefile +@@ -1,3 +1,6 @@ + obj-$(CONFIG_ARCH_CNS3XXX) += core.o pm.o devices.o + obj-$(CONFIG_PCI) += pcie.o + obj-$(CONFIG_MACH_CNS3420VB) += cns3420vb.o ++obj-$(CONFIG_SMP) += platsmp.o headsmp.o ++obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o ++obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o +--- /dev/null ++++ b/arch/arm/mach-cns3xxx/headsmp.S +@@ -0,0 +1,43 @@ ++/* ++ * linux/arch/arm/mach-cns3xxx/headsmp.S ++ * ++ * Copyright (c) 2003 ARM Limited ++ * Copyright 2011 Gateworks Corporation ++ * Chris Lang <clang@gateworks.com ++ * ++ * 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/linkage.h> ++#include <linux/init.h> ++ ++ __INIT ++ ++/* ++ * CNS3XXX specific entry point for secondary CPUs. This ++ * provides a "holding pen" into which all secondary cores are held ++ * until we're ready for them to initialise. ++ */ ++ENTRY(cns3xxx_secondary_startup) ++ mrc p15, 0, r0, c0, c0, 5 ++ and r0, r0, #15 ++ adr r4, 1f ++ ldmia r4, {r5, r6} ++ sub r4, r4, r5 ++ add r6, r6, r4 ++pen: ldr r7, [r6] ++ cmp r7, r0 ++ bne pen ++ ++ /* ++ * we've been released from the holding pen: secondary_stack ++ * should now contain the SVC stack for this core ++ */ ++ b secondary_startup ++ ++ .align ++1: .long . ++ .long pen_release +--- /dev/null ++++ b/arch/arm/mach-cns3xxx/hotplug.c +@@ -0,0 +1,131 @@ ++/* ++ * linux/arch/arm/mach-cns3xxx/hotplug.c ++ * ++ * Copyright (C) 2002 ARM Ltd. ++ * Copyright 2011 Gateworks Corporation ++ * Chris Lang <clang@gateworks.com> ++ * ++ * 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/kernel.h> ++#include <linux/errno.h> ++#include <linux/smp.h> ++ ++#include <asm/cacheflush.h> ++ ++extern volatile int pen_release; ++ ++static inline void cpu_enter_lowpower(void) ++{ ++ unsigned int v; ++ ++ flush_cache_all(); ++ asm volatile( ++ "mcr p15, 0, %1, c7, c5, 0\n" ++ " mcr p15, 0, %1, c7, c10, 4\n" ++ /* ++ * Turn off coherency ++ */ ++ " mrc p15, 0, %0, c1, c0, 1\n" ++ " bic %0, %0, %3\n" ++ " mcr p15, 0, %0, c1, c0, 1\n" ++ " mrc p15, 0, %0, c1, c0, 0\n" ++ " bic %0, %0, %2\n" ++ " mcr p15, 0, %0, c1, c0, 0\n" ++ : "=&r" (v) ++ : "r" (0), "Ir" (CR_C), "Ir" (0x40) ++ : "cc"); ++} ++ ++static inline void cpu_leave_lowpower(void) ++{ ++ unsigned int v; ++ ++ asm volatile( ++ "mrc p15, 0, %0, c1, c0, 0\n" ++ " orr %0, %0, %1\n" ++ " mcr p15, 0, %0, c1, c0, 0\n" ++ " mrc p15, 0, %0, c1, c0, 1\n" ++ " orr %0, %0, %2\n" ++ " mcr p15, 0, %0, c1, c0, 1\n" ++ : "=&r" (v) ++ : "Ir" (CR_C), "Ir" (0x40) ++ : "cc"); ++} ++ ++static inline void platform_do_lowpower(unsigned int cpu, int *spurious) ++{ ++ /* ++ * there is no power-control hardware on this platform, so all ++ * we can do is put the core into WFI; this is safe as the calling ++ * code will have already disabled interrupts ++ */ ++ for (;;) { ++ /* ++ * here's the WFI ++ */ ++ asm(".word 0xe320f003\n" ++ : ++ : ++ : "memory", "cc"); ++ ++ if (pen_release == cpu) { ++ /* ++ * OK, proper wakeup, we're done ++ */ ++ break; ++ } ++ ++ /* ++ * Getting here, means that we have come out of WFI without ++ * having been woken up - this shouldn't happen ++ * ++ * Just note it happening - when we're woken, we can report ++ * its occurrence. ++ */ ++ (*spurious)++; ++ } ++} ++ ++int platform_cpu_kill(unsigned int cpu) ++{ ++ return 1; ++} ++ ++/* ++ * platform-specific code to shutdown a CPU ++ * ++ * Called with IRQs disabled ++ */ ++void platform_cpu_die(unsigned int cpu) ++{ ++ int spurious = 0; ++ ++ /* ++ * we're ready for shutdown now, so do it ++ */ ++ cpu_enter_lowpower(); ++ platform_do_lowpower(cpu, &spurious); ++ ++ /* ++ * bring this CPU back into the world of cache ++ * coherency, and then restore interrupts ++ */ ++ cpu_leave_lowpower(); ++ ++ if (spurious) ++ pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious); ++} ++ ++int platform_cpu_disable(unsigned int cpu) ++{ ++ /* ++ * we don't allow CPU 0 to be shutdown (it is still too special ++ * e.g. clock tick interrupts) ++ */ ++ return cpu == 0 ? -EPERM : 0; ++} +--- /dev/null ++++ b/arch/arm/mach-cns3xxx/localtimer.c +@@ -0,0 +1,29 @@ ++/* ++ * linux/arch/arm/mach-cns3xxx/localtimer.c ++ * ++ * Copyright (C) 2002 ARM Ltd. ++ * Copyright 2011 Gateworks Corporation ++ * Chris Lang <clang@gateworks.com> ++ * ++ * 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/smp.h> ++#include <linux/clockchips.h> ++ ++#include <asm/smp_twd.h> ++#include <asm/localtimer.h> ++#include <mach/irqs.h> ++ ++/* ++ * Setup the local clock events for a CPU. ++ */ ++void __cpuinit local_timer_setup(struct clock_event_device *evt) ++{ ++ evt->irq = IRQ_LOCALTIMER; ++ twd_timer_setup(evt); ++} +--- /dev/null ++++ b/arch/arm/mach-cns3xxx/platsmp.c +@@ -0,0 +1,168 @@ ++/* ++ * linux/arch/arm/mach-cns3xxx/platsmp.c ++ * ++ * Copyright (C) 2002 ARM Ltd. ++ * Copyright 2011 Gateworks Corporation ++ * Chris Lang <clang@gateworks.com> ++ * ++ * 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> ++#include <linux/device.h> ++#include <linux/jiffies.h> ++#include <linux/smp.h> ++#include <linux/io.h> ++ ++#include <asm/cacheflush.h> ++#include <asm/smp_scu.h> ++#include <asm/unified.h> ++#include <mach/hardware.h> ++#include <mach/cns3xxx.h> ++ ++#include "core.h" ++ ++extern void cns3xxx_secondary_startup(void); ++ ++/* ++ * control for which core is the next to come out of the secondary ++ * boot "holding pen" ++ */ ++volatile int __cpuinitdata pen_release = -1; ++ ++/* ++ * Write pen_release in a way that is guaranteed to be visible to all ++ * observers, irrespective of whether they're taking part in coherency ++ * or not. This is necessary for the hotplug code to work reliably. ++ */ ++static void __cpuinit write_pen_release(int val) ++{ ++ pen_release = val; ++ smp_wmb(); ++ __cpuc_flush_dcache_area((void *)&pen_release, sizeof(pen_release)); ++ 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) ++{ ++ /* ++ * if any interrupts are already enabled for the primary ++ * core (e.g. timer irq), then they will not have been enabled ++ * for us: do so ++ */ ++ gic_secondary_init(0); ++ ++ /* ++ * let the primary processor know we're out of the ++ * pen, then head off into the C entry point ++ */ ++ write_pen_release(-1); ++ ++ /* ++ * Synchronise with the boot thread. ++ */ ++ spin_lock(&boot_lock); ++ spin_unlock(&boot_lock); ++} ++ ++int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) ++{ ++ unsigned long timeout; ++ ++ /* ++ * Set synchronisation state between this boot processor ++ * and the secondary one ++ */ ++ spin_lock(&boot_lock); ++ ++ /* ++ * This is really belt and braces; we hold unintended secondary ++ * CPUs in the holding pen until we're ready for them. However, ++ * since we haven't sent them a soft interrupt, they shouldn't ++ * be there. ++ */ ++ write_pen_release(cpu); ++ ++ /* ++ * Send the secondary CPU a soft interrupt, thereby causing ++ * the boot monitor to read the system wide flags register, ++ * and branch to the address found there. ++ */ ++ smp_cross_call(cpumask_of(cpu), 1); ++ ++ timeout = jiffies + (1 * HZ); ++ while (time_before(jiffies, timeout)) { ++ smp_rmb(); ++ if (pen_release == -1) ++ break; ++ ++ udelay(10); ++ } ++ ++ /* ++ * now the secondary core is starting up let it run its ++ * calibrations, then wait for it to finish ++ */ ++ spin_unlock(&boot_lock); ++ ++ return pen_release != -1 ? -ENOSYS : 0; ++} ++ ++/* ++ * 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; ++ ++ ncores = scu_base ? scu_get_core_count(scu_base) : 1; ++ ++ /* 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 (i = 0; i < ncores; i++) ++ set_cpu_possible(i, true); ++} ++ ++void __init platform_smp_prepare_cpus(unsigned int max_cpus) ++{ ++ int i; ++ ++ /* ++ * Initialise the present map, which describes the set of CPUs ++ * actually populated at the present time. ++ */ ++ for (i = 0; i < max_cpus; i++) ++ set_cpu_present(i, true); ++ ++ scu_enable(scu_base_addr()); ++ ++ /* ++ * Write the address of secondary startup into the ++ * system-wide flags register. The boot monitor waits ++ * until it receives a soft interrupt, and then the ++ * secondary CPU branches to this address. ++ */ ++ __raw_writel(virt_to_phys(cns3xxx_secondary_startup), ++ (void __iomem *)(0xFFF07000 + 0x0600)); ++} +--- /dev/null ++++ b/arch/arm/mach-cns3xxx/include/mach/smp.h +@@ -0,0 +1,13 @@ ++#ifndef __MACH_SMP_H ++#define __MACH_SMP_H ++ ++#include <asm/hardware/gic.h> ++ ++/* ++ * We use IRQ1 as the IPI ++ */ ++static inline void smp_cross_call(const struct cpumask *mask, int ipi) ++{ ++ gic_raise_softirq(mask, ipi); ++} ++#endif +--- a/arch/arm/Kconfig ++++ b/arch/arm/Kconfig +@@ -1325,7 +1325,7 @@ config SMP + depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \ + MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \ + ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \ +- ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE ++ ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE || ARCH_CNS3XXX + select USE_GENERIC_SMP_HELPERS + select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP + help |