diff options
Diffstat (limited to 'arch/blackfin/mach-bf561/smp.c')
| -rw-r--r-- | arch/blackfin/mach-bf561/smp.c | 157 |
1 files changed, 81 insertions, 76 deletions
diff --git a/arch/blackfin/mach-bf561/smp.c b/arch/blackfin/mach-bf561/smp.c index 9b27e698c0b..11789beca75 100644 --- a/arch/blackfin/mach-bf561/smp.c +++ b/arch/blackfin/mach-bf561/smp.c @@ -1,23 +1,8 @@ /* - * File: arch/blackfin/mach-bf561/smp.c - * Author: Philippe Gerum <rpm@xenomai.org> + * Copyright 2007-2009 Analog Devices Inc. + * Philippe Gerum <rpm@xenomai.org> * - * Copyright 2007 Analog Devices Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, see the file COPYING, or write - * to the Free Software Foundation, Inc., - * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * Licensed under the GPL-2 or later. */ #include <linux/init.h> @@ -26,11 +11,10 @@ #include <linux/delay.h> #include <asm/smp.h> #include <asm/dma.h> +#include <asm/time.h> static DEFINE_SPINLOCK(boot_lock); -static cpumask_t cpu_callin_map; - /* * platform_init_cpus() - Tell the world about how many cores we * have. This is called while setting up the architecture support @@ -40,24 +24,23 @@ static cpumask_t cpu_callin_map; void __init platform_init_cpus(void) { - cpu_set(0, cpu_possible_map); /* CoreA */ - cpu_set(1, cpu_possible_map); /* CoreB */ + struct cpumask mask; + + cpumask_set_cpu(0, &mask); /* CoreA */ + cpumask_set_cpu(1, &mask); /* CoreB */ + init_cpu_possible(&mask); } void __init platform_prepare_cpus(unsigned int max_cpus) { - int len; - - len = &coreb_trampoline_end - &coreb_trampoline_start + 1; - BUG_ON(len > L1_CODE_LENGTH); + struct cpumask mask; - dma_memcpy((void *)COREB_L1_CODE_START, &coreb_trampoline_start, len); + bfin_relocate_coreb_l1_mem(); /* Both cores ought to be present on a bf561! */ - cpu_set(0, cpu_present_map); /* CoreA */ - cpu_set(1, cpu_present_map); /* CoreB */ - - printk(KERN_INFO "CoreB bootstrap code to SRAM %p via DMA.\n", (void *)COREB_L1_CODE_START); + cpumask_set_cpu(0, &mask); /* CoreA */ + cpumask_set_cpu(1, &mask); /* CoreB */ + init_cpu_present(&mask); } int __init setup_profiling_timer(unsigned int multiplier) /* not supported */ @@ -65,103 +48,125 @@ int __init setup_profiling_timer(unsigned int multiplier) /* not supported */ return -EINVAL; } -void __cpuinit platform_secondary_init(unsigned int cpu) +void platform_secondary_init(unsigned int cpu) { - local_irq_disable(); - /* Clone setup for peripheral interrupt sources from CoreA. */ - bfin_write_SICB_IMASK0(bfin_read_SICA_IMASK0()); - bfin_write_SICB_IMASK1(bfin_read_SICA_IMASK1()); + bfin_write_SICB_IMASK0(bfin_read_SIC_IMASK0()); + bfin_write_SICB_IMASK1(bfin_read_SIC_IMASK1()); SSYNC(); /* Clone setup for IARs from CoreA. */ - bfin_write_SICB_IAR0(bfin_read_SICA_IAR0()); - bfin_write_SICB_IAR1(bfin_read_SICA_IAR1()); - bfin_write_SICB_IAR2(bfin_read_SICA_IAR2()); - bfin_write_SICB_IAR3(bfin_read_SICA_IAR3()); - bfin_write_SICB_IAR4(bfin_read_SICA_IAR4()); - bfin_write_SICB_IAR5(bfin_read_SICA_IAR5()); - bfin_write_SICB_IAR6(bfin_read_SICA_IAR6()); - bfin_write_SICB_IAR7(bfin_read_SICA_IAR7()); + bfin_write_SICB_IAR0(bfin_read_SIC_IAR0()); + bfin_write_SICB_IAR1(bfin_read_SIC_IAR1()); + bfin_write_SICB_IAR2(bfin_read_SIC_IAR2()); + bfin_write_SICB_IAR3(bfin_read_SIC_IAR3()); + bfin_write_SICB_IAR4(bfin_read_SIC_IAR4()); + bfin_write_SICB_IAR5(bfin_read_SIC_IAR5()); + bfin_write_SICB_IAR6(bfin_read_SIC_IAR6()); + bfin_write_SICB_IAR7(bfin_read_SIC_IAR7()); + bfin_write_SICB_IWR0(IWR_DISABLE_ALL); + bfin_write_SICB_IWR1(IWR_DISABLE_ALL); SSYNC(); - local_irq_enable(); - - /* Calibrate loops per jiffy value. */ - calibrate_delay(); - - /* Store CPU-private information to the cpu_data array. */ - bfin_setup_cpudata(cpu); - /* We are done with local CPU inits, unblock the boot CPU. */ - cpu_set(cpu, cpu_callin_map); spin_lock(&boot_lock); spin_unlock(&boot_lock); } -int __cpuinit platform_boot_secondary(unsigned int cpu, struct task_struct *idle) +int platform_boot_secondary(unsigned int cpu, struct task_struct *idle) { unsigned long timeout; - /* CoreB already running?! */ - BUG_ON((bfin_read_SICA_SYSCR() & COREB_SRAM_INIT) == 0); - printk(KERN_INFO "Booting Core B.\n"); spin_lock(&boot_lock); - /* Kick CoreB, which should start execution from CORE_SRAM_BASE. */ - SSYNC(); - bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() & ~COREB_SRAM_INIT); - SSYNC(); + if ((bfin_read_SYSCR() & COREB_SRAM_INIT) == 0) { + /* CoreB already running, sending ipi to wakeup it */ + smp_send_reschedule(cpu); + } else { + /* Kick CoreB, which should start execution from CORE_SRAM_BASE. */ + bfin_write_SYSCR(bfin_read_SYSCR() & ~COREB_SRAM_INIT); + SSYNC(); + } - timeout = jiffies + 1 * HZ; + timeout = jiffies + HZ; + /* release the lock and let coreb run */ + spin_unlock(&boot_lock); while (time_before(jiffies, timeout)) { - if (cpu_isset(cpu, cpu_callin_map)) + if (cpu_online(cpu)) break; udelay(100); barrier(); } - spin_unlock(&boot_lock); - - return cpu_isset(cpu, cpu_callin_map) ? 0 : -ENOSYS; + if (cpu_online(cpu)) { + return 0; + } else + panic("CPU%u: processor failed to boot\n", cpu); } -void __init platform_request_ipi(irq_handler_t handler) +static const char supple0[] = "IRQ_SUPPLE_0"; +static const char supple1[] = "IRQ_SUPPLE_1"; +void __init platform_request_ipi(int irq, void *handler) { int ret; + const char *name = (irq == IRQ_SUPPLE_0) ? supple0 : supple1; - ret = request_irq(IRQ_SUPPLE_0, handler, IRQF_DISABLED, - "SMP interrupt", handler); + ret = request_irq(irq, handler, IRQF_PERCPU | IRQF_NO_SUSPEND | + IRQF_FORCE_RESUME, name, handler); if (ret) - panic("Cannot request supplemental interrupt 0 for IPI service\n"); + panic("Cannot request %s for IPI service", name); } -void platform_send_ipi(cpumask_t callmap) +void platform_send_ipi(cpumask_t callmap, int irq) { unsigned int cpu; + int offset = (irq == IRQ_SUPPLE_0) ? 6 : 8; for_each_cpu_mask(cpu, callmap) { BUG_ON(cpu >= 2); SSYNC(); - bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (6 + cpu))); + bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (offset + cpu))); SSYNC(); } } -void platform_send_ipi_cpu(unsigned int cpu) +void platform_send_ipi_cpu(unsigned int cpu, int irq) { + int offset = (irq == IRQ_SUPPLE_0) ? 6 : 8; BUG_ON(cpu >= 2); SSYNC(); - bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (6 + cpu))); + bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (offset + cpu))); SSYNC(); } -void platform_clear_ipi(unsigned int cpu) +void platform_clear_ipi(unsigned int cpu, int irq) { + int offset = (irq == IRQ_SUPPLE_0) ? 10 : 12; BUG_ON(cpu >= 2); SSYNC(); - bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (10 + cpu))); + bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (offset + cpu))); SSYNC(); } + +/* + * Setup core B's local core timer. + * In SMP, core timer is used for clock event device. + */ +void bfin_local_timer_setup(void) +{ +#if defined(CONFIG_TICKSOURCE_CORETMR) + struct irq_data *data = irq_get_irq_data(IRQ_CORETMR); + struct irq_chip *chip = irq_data_get_irq_chip(data); + + bfin_coretmr_init(); + bfin_coretmr_clockevent_init(); + + chip->irq_unmask(data); +#else + /* Power down the core timer, just to play safe. */ + bfin_write_TCNTL(0); +#endif + +} |