diff options
Diffstat (limited to 'arch/arm/mach-omap2/omap-smp.c')
| -rw-r--r-- | arch/arm/mach-omap2/omap-smp.c | 169 |
1 files changed, 115 insertions, 54 deletions
diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c index c1bf3ef0ba0..256e84ef0f6 100644 --- a/arch/arm/mach-omap2/omap-smp.c +++ b/arch/arm/mach-omap2/omap-smp.c @@ -1,5 +1,5 @@ /* - * OMAP4 SMP source file. It contains platform specific fucntions + * OMAP4 SMP source file. It contains platform specific functions * needed for the linux smp kernel. * * Copyright (C) 2009 Texas Instruments, Inc. @@ -19,16 +19,25 @@ #include <linux/device.h> #include <linux/smp.h> #include <linux/io.h> +#include <linux/irqchip/arm-gic.h> -#include <asm/cacheflush.h> -#include <asm/hardware/gic.h> #include <asm/smp_scu.h> -#include <mach/hardware.h> -#include <mach/omap-secure.h> -#include "common.h" +#include "omap-secure.h" +#include "omap-wakeupgen.h" +#include <asm/cputype.h> +#include "soc.h" +#include "iomap.h" +#include "common.h" #include "clockdomain.h" +#include "pm.h" + +#define CPU_MASK 0xff0ffff0 +#define CPU_CORTEX_A9 0x410FC090 +#define CPU_CORTEX_A15 0x410FC0F0 + +#define OMAP5_CORE_COUNT 0x2 /* SCU base address */ static void __iomem *scu_base; @@ -40,7 +49,7 @@ void __iomem *omap4_get_scu_base(void) return scu_base; } -void __cpuinit platform_secondary_init(unsigned int cpu) +static void omap4_secondary_init(unsigned int cpu) { /* * Configure ACTRL and enable NS SMP bit access on CPU1 on HS device. @@ -55,11 +64,11 @@ void __cpuinit platform_secondary_init(unsigned int cpu) 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 + * Configure the CNTFRQ register for the secondary cpu's which + * indicates the frequency of the cpu local timers. */ - gic_secondary_init(0); + if (soc_is_omap54xx() || soc_is_dra7xx()) + set_cntfreq(); /* * Synchronise with the boot thread. @@ -68,10 +77,13 @@ void __cpuinit platform_secondary_init(unsigned int cpu) spin_unlock(&boot_lock); } -int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) +static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle) { static struct clockdomain *cpu1_clkdm; static bool booted; + static struct powerdomain *cpu1_pwrdm; + void __iomem *base = omap_get_wakeupgen_base(); + /* * Set synchronisation state between this boot processor * and the secondary one @@ -80,16 +92,19 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) /* * Update the AuxCoreBoot0 with boot state for secondary core. - * omap_secondary_startup() routine will hold the secondary core till + * omap4_secondary_startup() routine will hold the secondary core till * the AuxCoreBoot1 register is updated with cpu state * A barrier is added to ensure that write buffer is drained */ - omap_modify_auxcoreboot0(0x200, 0xfffffdff); - flush_cache_all(); - smp_wmb(); + if (omap_secure_apis_support()) + omap_modify_auxcoreboot0(0x200, 0xfffffdff); + else + writel_relaxed(0x20, base + OMAP_AUX_CORE_BOOT_0); - if (!cpu1_clkdm) + if (!cpu1_clkdm && !cpu1_pwrdm) { cpu1_clkdm = clkdm_lookup("mpu1_clkdm"); + cpu1_pwrdm = pwrdm_lookup("cpu1_pwrdm"); + } /* * The SGI(Software Generated Interrupts) are not wakeup capable @@ -102,15 +117,49 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) * Section : * 4.3.4.2 Power States of CPU0 and CPU1 */ - if (booted) { + if (booted && cpu1_pwrdm && cpu1_clkdm) { + /* + * GIC distributor control register has changed between + * CortexA9 r1pX and r2pX. The Control Register secure + * banked version is now composed of 2 bits: + * bit 0 == Secure Enable + * bit 1 == Non-Secure Enable + * The Non-Secure banked register has not changed + * Because the ROM Code is based on the r1pX GIC, the CPU1 + * GIC restoration will cause a problem to CPU0 Non-Secure SW. + * The workaround must be: + * 1) Before doing the CPU1 wakeup, CPU0 must disable + * the GIC distributor + * 2) CPU1 must re-enable the GIC distributor on + * it's wakeup path. + */ + if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) { + local_irq_disable(); + gic_dist_disable(); + } + + /* + * Ensure that CPU power state is set to ON to avoid CPU + * powerdomain transition on wfi + */ clkdm_wakeup(cpu1_clkdm); + omap_set_pwrdm_state(cpu1_pwrdm, PWRDM_POWER_ON); clkdm_allow_idle(cpu1_clkdm); + + if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) { + while (gic_dist_disabled()) { + udelay(1); + cpu_relax(); + } + gic_timer_retrigger(); + local_irq_enable(); + } } else { dsb_sev(); booted = true; } - gic_raise_softirq(cpumask_of(cpu), 1); + arch_send_wakeup_ipi_mask(cpumask_of(cpu)); /* * Now the secondary core is starting up let it run its @@ -121,41 +170,27 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) return 0; } -static void __init wakeup_secondary(void) -{ - /* - * Write the address of secondary startup routine into the - * AuxCoreBoot1 where ROM code will jump and start executing - * on secondary core once out of WFE - * A barrier is added to ensure that write buffer is drained - */ - omap_auxcoreboot_addr(virt_to_phys(omap_secondary_startup)); - smp_wmb(); - - /* - * Send a 'sev' to wake the secondary core from WFE. - * Drain the outstanding writes to memory - */ - dsb_sev(); - mb(); -} - /* * 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) +static void __init omap4_smp_init_cpus(void) { - unsigned int i, ncores; - - /* - * Currently we can't call ioremap here because - * SoC detection won't work until after init_early. - */ - scu_base = OMAP2_L4_IO_ADDRESS(OMAP44XX_SCU_BASE); - BUG_ON(!scu_base); - - ncores = scu_get_core_count(scu_base); + unsigned int i = 0, ncores = 1, cpu_id; + + /* Use ARM cpuid check here, as SoC detection will not work so early */ + cpu_id = read_cpuid_id() & CPU_MASK; + if (cpu_id == CPU_CORTEX_A9) { + /* + * Currently we can't call ioremap here because + * SoC detection won't work until after init_early. + */ + scu_base = OMAP2_L4_IO_ADDRESS(scu_a9_get_base()); + BUG_ON(!scu_base); + ncores = scu_get_core_count(scu_base); + } else if (cpu_id == CPU_CORTEX_A15) { + ncores = OMAP5_CORE_COUNT; + } /* sanity check */ if (ncores > nr_cpu_ids) { @@ -166,17 +201,43 @@ void __init smp_init_cpus(void) for (i = 0; i < ncores; i++) set_cpu_possible(i, true); - - set_smp_cross_call(gic_raise_softirq); } -void __init platform_smp_prepare_cpus(unsigned int max_cpus) +static void __init omap4_smp_prepare_cpus(unsigned int max_cpus) { + void *startup_addr = omap4_secondary_startup; + void __iomem *base = omap_get_wakeupgen_base(); /* * Initialise the SCU and wake up the secondary core using * wakeup_secondary(). */ - scu_enable(scu_base); - wakeup_secondary(); + if (scu_base) + scu_enable(scu_base); + + if (cpu_is_omap446x()) + startup_addr = omap4460_secondary_startup; + + /* + * Write the address of secondary startup routine into the + * AuxCoreBoot1 where ROM code will jump and start executing + * on secondary core once out of WFE + * A barrier is added to ensure that write buffer is drained + */ + if (omap_secure_apis_support()) + omap_auxcoreboot_addr(virt_to_phys(startup_addr)); + else + writel_relaxed(virt_to_phys(omap5_secondary_startup), + base + OMAP_AUX_CORE_BOOT_1); + } + +struct smp_operations omap4_smp_ops __initdata = { + .smp_init_cpus = omap4_smp_init_cpus, + .smp_prepare_cpus = omap4_smp_prepare_cpus, + .smp_secondary_init = omap4_secondary_init, + .smp_boot_secondary = omap4_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die = omap4_cpu_die, +#endif +}; |