diff options
Diffstat (limited to 'arch/arm/mach-omap2/omap-smp.c')
| -rw-r--r-- | arch/arm/mach-omap2/omap-smp.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c index e99bc6cd4714..c1bf3ef0ba02 100644 --- a/arch/arm/mach-omap2/omap-smp.c +++ b/arch/arm/mach-omap2/omap-smp.c @@ -24,17 +24,37 @@ #include <asm/hardware/gic.h> #include <asm/smp_scu.h> #include <mach/hardware.h> +#include <mach/omap-secure.h> #include "common.h" +#include "clockdomain.h" + /* SCU base address */ static void __iomem *scu_base; static DEFINE_SPINLOCK(boot_lock); +void __iomem *omap4_get_scu_base(void) +{ + return scu_base; +} + void __cpuinit platform_secondary_init(unsigned int cpu) { /* + * Configure ACTRL and enable NS SMP bit access on CPU1 on HS device. + * OMAP44XX EMU/HS devices - CPU0 SMP bit access is enabled in PPA + * init and for CPU1, a secure PPA API provided. CPU0 must be ON + * while executing NS_SMP API on CPU1 and PPA version must be 1.4.0+. + * OMAP443X GP devices- SMP bit isn't accessible. + * OMAP446X GP devices - SMP bit access is enabled on both CPUs. + */ + if (cpu_is_omap443x() && (omap_type() != OMAP2_DEVICE_TYPE_GP)) + omap_secure_dispatcher(OMAP4_PPA_CPU_ACTRL_SMP_INDEX, + 4, 0, 0, 0, 0, 0); + + /* * 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 @@ -50,6 +70,8 @@ void __cpuinit platform_secondary_init(unsigned int cpu) int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) { + static struct clockdomain *cpu1_clkdm; + static bool booted; /* * Set synchronisation state between this boot processor * and the secondary one @@ -65,6 +87,29 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) omap_modify_auxcoreboot0(0x200, 0xfffffdff); flush_cache_all(); smp_wmb(); + + if (!cpu1_clkdm) + cpu1_clkdm = clkdm_lookup("mpu1_clkdm"); + + /* + * The SGI(Software Generated Interrupts) are not wakeup capable + * from low power states. This is known limitation on OMAP4 and + * needs to be worked around by using software forced clockdomain + * wake-up. To wakeup CPU1, CPU0 forces the CPU1 clockdomain to + * software force wakeup. The clockdomain is then put back to + * hardware supervised mode. + * More details can be found in OMAP4430 TRM - Version J + * Section : + * 4.3.4.2 Power States of CPU0 and CPU1 + */ + if (booted) { + clkdm_wakeup(cpu1_clkdm); + clkdm_allow_idle(cpu1_clkdm); + } else { + dsb_sev(); + booted = true; + } + gic_raise_softirq(cpumask_of(cpu), 1); /* |