1 /* Sparc SS1000/SC2000 SMP support.
3 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 * Based on sun4m's smp.c, which is:
6 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
9 #include <linux/clockchips.h>
10 #include <linux/interrupt.h>
11 #include <linux/profile.h>
12 #include <linux/delay.h>
13 #include <linux/sched.h>
14 #include <linux/cpu.h>
16 #include <asm/cacheflush.h>
17 #include <asm/switch_to.h>
18 #include <asm/tlbflush.h>
19 #include <asm/timer.h>
20 #include <asm/oplib.h>
27 #define IRQ_CROSS_CALL 15
29 static volatile int smp_processors_ready;
30 static int smp_highest_cpu;
32 static inline unsigned long sun4d_swap(volatile unsigned long *ptr, unsigned long val)
34 __asm__ __volatile__("swap [%1], %0\n\t" :
35 "=&r" (val), "=&r" (ptr) :
36 "0" (val), "1" (ptr));
40 static void smp4d_ipi_init(void);
42 static unsigned char cpu_leds[32];
44 static inline void show_leds(int cpuid)
47 __asm__ __volatile__ ("stba %0, [%1] %2" : :
48 "r" ((cpu_leds[cpuid] << 4) | cpu_leds[cpuid+1]),
49 "r" (ECSR_BASE(cpuid) | BB_LEDS),
53 void __cpuinit smp4d_callin(void)
55 int cpuid = hard_smp4d_processor_id();
58 /* Show we are alive */
59 cpu_leds[cpuid] = 0x6;
62 /* Enable level15 interrupt, disable level14 interrupt for now */
63 cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
65 local_ops->cache_all();
68 notify_cpu_starting(cpuid);
70 * Unblock the master CPU _only_ when the scheduler state
71 * of all secondary CPUs will be up-to-date, so after
72 * the SMP initialization the master will be just allowed
73 * to call the scheduler code.
75 /* Get our local ticker going. */
76 register_percpu_ce(cpuid);
79 smp_store_cpu_info(cpuid);
80 local_ops->cache_all();
83 /* Allow master to continue. */
84 sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1);
85 local_ops->cache_all();
88 while ((unsigned long)current_set[cpuid] < PAGE_OFFSET)
91 while (current_set[cpuid]->cpu != cpuid)
94 /* Fix idle thread fields. */
95 __asm__ __volatile__("ld [%0], %%g6\n\t"
96 : : "r" (¤t_set[cpuid])
97 : "memory" /* paranoid */);
99 cpu_leds[cpuid] = 0x9;
102 /* Attach to the address space of init_task. */
103 atomic_inc(&init_mm.mm_count);
104 current->active_mm = &init_mm;
106 local_ops->cache_all();
107 local_ops->tlb_all();
109 local_irq_enable(); /* We don't allow PIL 14 yet */
111 while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
114 spin_lock_irqsave(&sun4d_imsk_lock, flags);
115 cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
116 spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
117 set_cpu_online(cpuid, true);
122 * Cycle through the processors asking the PROM to start each one.
124 void __init smp4d_boot_cpus(void)
128 current_set[0] = NULL;
129 local_ops->cache_all();
132 int __cpuinit smp4d_boot_one_cpu(int i)
134 unsigned long *entry = &sun4d_cpu_startup;
135 struct task_struct *p;
139 cpu_find_by_instance(i, &cpu_node, NULL);
140 /* Cook up an idler for this guy. */
142 current_set[i] = task_thread_info(p);
145 * Initialize the contexts table
146 * Since the call to prom_startcpu() trashes the structure,
147 * we need to re-initialize it for each cpu
149 smp_penguin_ctable.which_io = 0;
150 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
151 smp_penguin_ctable.reg_size = 0;
153 /* whirrr, whirrr, whirrrrrrrrr... */
154 printk(KERN_INFO "Starting CPU %d at %p\n", i, entry);
155 local_ops->cache_all();
156 prom_startcpu(cpu_node,
157 &smp_penguin_ctable, 0, (char *)entry);
159 printk(KERN_INFO "prom_startcpu returned :)\n");
161 /* wheee... it's going... */
162 for (timeout = 0; timeout < 10000; timeout++) {
163 if (cpu_callin_map[i])
168 if (!(cpu_callin_map[i])) {
169 printk(KERN_ERR "Processor %d is stuck.\n", i);
173 local_ops->cache_all();
177 void __init smp4d_smp_done(void)
182 /* setup cpu list for irq rotation */
185 for_each_online_cpu(i) {
187 prev = &cpu_data(i).next;
190 local_ops->cache_all();
192 /* Ok, they are spinning and ready to go. */
193 smp_processors_ready = 1;
194 sun4d_distribute_irqs();
197 /* Memory structure giving interrupt handler information about IPI generated */
198 struct sun4d_ipi_work {
204 static DEFINE_PER_CPU_SHARED_ALIGNED(struct sun4d_ipi_work, sun4d_ipi_work);
206 /* Initialize IPIs on the SUN4D SMP machine */
207 static void __init smp4d_ipi_init(void)
210 struct sun4d_ipi_work *work;
212 printk(KERN_INFO "smp4d: setup IPI at IRQ %d\n", SUN4D_IPI_IRQ);
214 for_each_possible_cpu(cpu) {
215 work = &per_cpu(sun4d_ipi_work, cpu);
216 work->single = work->msk = work->resched = 0;
220 void sun4d_ipi_interrupt(void)
222 struct sun4d_ipi_work *work = &__get_cpu_var(sun4d_ipi_work);
226 smp_call_function_single_interrupt();
230 smp_call_function_interrupt();
234 smp_resched_interrupt();
238 static void smp4d_ipi_single(int cpu)
240 struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu);
245 /* Generate IRQ on the CPU */
246 sun4d_send_ipi(cpu, SUN4D_IPI_IRQ);
249 static void smp4d_ipi_mask_one(int cpu)
251 struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu);
256 /* Generate IRQ on the CPU */
257 sun4d_send_ipi(cpu, SUN4D_IPI_IRQ);
260 static void smp4d_ipi_resched(int cpu)
262 struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu);
267 /* Generate IRQ on the CPU (any IRQ will cause resched) */
268 sun4d_send_ipi(cpu, SUN4D_IPI_IRQ);
271 static struct smp_funcall {
278 unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */
279 unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
280 } ccall_info __attribute__((aligned(8)));
282 static DEFINE_SPINLOCK(cross_call_lock);
284 /* Cross calls must be serialized, at least currently. */
285 static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
286 unsigned long arg2, unsigned long arg3,
289 if (smp_processors_ready) {
290 register int high = smp_highest_cpu;
293 spin_lock_irqsave(&cross_call_lock, flags);
297 * If you make changes here, make sure
298 * gcc generates proper code...
300 register smpfunc_t f asm("i0") = func;
301 register unsigned long a1 asm("i1") = arg1;
302 register unsigned long a2 asm("i2") = arg2;
303 register unsigned long a3 asm("i3") = arg3;
304 register unsigned long a4 asm("i4") = arg4;
305 register unsigned long a5 asm("i5") = 0;
307 __asm__ __volatile__(
309 "std %2, [%6 + 8]\n\t"
310 "std %4, [%6 + 16]\n\t" : :
311 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
312 "r" (&ccall_info.func));
315 /* Init receive/complete mapping, plus fire the IPI's off. */
319 cpumask_clear_cpu(smp_processor_id(), &mask);
320 cpumask_and(&mask, cpu_online_mask, &mask);
321 for (i = 0; i <= high; i++) {
322 if (cpumask_test_cpu(i, &mask)) {
323 ccall_info.processors_in[i] = 0;
324 ccall_info.processors_out[i] = 0;
325 sun4d_send_ipi(i, IRQ_CROSS_CALL);
335 if (!cpumask_test_cpu(i, &mask))
337 while (!ccall_info.processors_in[i])
339 } while (++i <= high);
343 if (!cpumask_test_cpu(i, &mask))
345 while (!ccall_info.processors_out[i])
347 } while (++i <= high);
350 spin_unlock_irqrestore(&cross_call_lock, flags);
354 /* Running cross calls. */
355 void smp4d_cross_call_irq(void)
357 int i = hard_smp4d_processor_id();
359 ccall_info.processors_in[i] = 1;
360 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
361 ccall_info.arg4, ccall_info.arg5);
362 ccall_info.processors_out[i] = 1;
365 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
367 struct pt_regs *old_regs;
368 int cpu = hard_smp4d_processor_id();
369 struct clock_event_device *ce;
370 static int cpu_tick[NR_CPUS];
371 static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
373 old_regs = set_irq_regs(regs);
374 bw_get_prof_limit(cpu);
375 bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */
378 if (!(cpu_tick[cpu] & 15)) {
379 if (cpu_tick[cpu] == 0x60)
381 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
385 ce = &per_cpu(sparc32_clockevent, cpu);
388 ce->event_handler(ce);
391 set_irq_regs(old_regs);
394 void __init smp4d_blackbox_id(unsigned *addr)
396 int rd = *addr & 0x3e000000;
398 addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
399 addr[1] = 0x01000000; /* nop */
400 addr[2] = 0x01000000; /* nop */
403 void __init smp4d_blackbox_current(unsigned *addr)
405 int rd = *addr & 0x3e000000;
407 addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
408 addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
409 addr[4] = 0x01000000; /* nop */
412 void __init sun4d_init_smp(void)
416 /* Patch ipi15 trap table */
417 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
419 /* And set btfixup... */
420 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
421 BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
422 BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
423 BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
424 BTFIXUPSET_CALL(smp_ipi_resched, smp4d_ipi_resched, BTFIXUPCALL_NORM);
425 BTFIXUPSET_CALL(smp_ipi_single, smp4d_ipi_single, BTFIXUPCALL_NORM);
426 BTFIXUPSET_CALL(smp_ipi_mask_one, smp4d_ipi_mask_one, BTFIXUPCALL_NORM);
428 for (i = 0; i < NR_CPUS; i++) {
429 ccall_info.processors_in[i] = 1;
430 ccall_info.processors_out[i] = 1;