2 * Copyright 2007-2009 Analog Devices Inc.
3 * Philippe Gerum <rpm@xenomai.org>
5 * Licensed under the GPL-2 or later.
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/sched.h>
11 #include <linux/delay.h>
16 static DEFINE_SPINLOCK(boot_lock);
19 * platform_init_cpus() - Tell the world about how many cores we
20 * have. This is called while setting up the architecture support
21 * (setup_arch()), so don't be too demanding here with respect to
22 * available kernel services.
25 void __init platform_init_cpus(void)
27 cpu_set(0, cpu_possible_map); /* CoreA */
28 cpu_set(1, cpu_possible_map); /* CoreB */
31 void __init platform_prepare_cpus(unsigned int max_cpus)
35 len = &coreb_trampoline_end - &coreb_trampoline_start + 1;
36 BUG_ON(len > L1_CODE_LENGTH);
38 dma_memcpy((void *)COREB_L1_CODE_START, &coreb_trampoline_start, len);
40 /* Both cores ought to be present on a bf561! */
41 cpu_set(0, cpu_present_map); /* CoreA */
42 cpu_set(1, cpu_present_map); /* CoreB */
44 printk(KERN_INFO "CoreB bootstrap code to SRAM %p via DMA.\n", (void *)COREB_L1_CODE_START);
47 int __init setup_profiling_timer(unsigned int multiplier) /* not supported */
52 void __cpuinit platform_secondary_init(unsigned int cpu)
54 /* Clone setup for peripheral interrupt sources from CoreA. */
55 bfin_write_SICB_IMASK0(bfin_read_SICA_IMASK0());
56 bfin_write_SICB_IMASK1(bfin_read_SICA_IMASK1());
59 /* Clone setup for IARs from CoreA. */
60 bfin_write_SICB_IAR0(bfin_read_SICA_IAR0());
61 bfin_write_SICB_IAR1(bfin_read_SICA_IAR1());
62 bfin_write_SICB_IAR2(bfin_read_SICA_IAR2());
63 bfin_write_SICB_IAR3(bfin_read_SICA_IAR3());
64 bfin_write_SICB_IAR4(bfin_read_SICA_IAR4());
65 bfin_write_SICB_IAR5(bfin_read_SICA_IAR5());
66 bfin_write_SICB_IAR6(bfin_read_SICA_IAR6());
67 bfin_write_SICB_IAR7(bfin_read_SICA_IAR7());
70 /* Store CPU-private information to the cpu_data array. */
71 bfin_setup_cpudata(cpu);
73 /* We are done with local CPU inits, unblock the boot CPU. */
74 set_cpu_online(cpu, true);
75 spin_lock(&boot_lock);
76 spin_unlock(&boot_lock);
79 int __cpuinit platform_boot_secondary(unsigned int cpu, struct task_struct *idle)
81 unsigned long timeout;
83 /* CoreB already running?! */
84 BUG_ON((bfin_read_SICA_SYSCR() & COREB_SRAM_INIT) == 0);
86 printk(KERN_INFO "Booting Core B.\n");
88 spin_lock(&boot_lock);
90 /* Kick CoreB, which should start execution from CORE_SRAM_BASE. */
92 bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() & ~COREB_SRAM_INIT);
95 timeout = jiffies + 1 * HZ;
96 while (time_before(jiffies, timeout)) {
103 if (cpu_online(cpu)) {
104 /* release the lock and let coreb run */
105 spin_unlock(&boot_lock);
108 panic("CPU%u: processor failed to boot\n", cpu);
111 void __init platform_request_ipi(irq_handler_t handler)
115 ret = request_irq(IRQ_SUPPLE_0, handler, IRQF_DISABLED,
116 "Supplemental Interrupt0", handler);
118 panic("Cannot request supplemental interrupt 0 for IPI service");
121 void platform_send_ipi(cpumask_t callmap)
125 for_each_cpu_mask(cpu, callmap) {
128 bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (6 + cpu)));
133 void platform_send_ipi_cpu(unsigned int cpu)
137 bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (6 + cpu)));
141 void platform_clear_ipi(unsigned int cpu)
145 bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (10 + cpu)));
150 * Setup core B's local core timer.
151 * In SMP, core timer is used for clock event device.
153 void __cpuinit bfin_local_timer_setup(void)
155 #if defined(CONFIG_TICKSOURCE_CORETMR)
157 bfin_coretmr_clockevent_init();
158 get_irq_chip(IRQ_CORETMR)->unmask(IRQ_CORETMR);
160 /* Power down the core timer, just to play safe. */