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 sun4d_cpu_pre_starting(void *arg
)
55 int cpuid
= hard_smp_processor_id();
57 /* Show we are alive */
58 cpu_leds
[cpuid
] = 0x6;
61 /* Enable level15 interrupt, disable level14 interrupt for now */
62 cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
65 void sun4d_cpu_pre_online(void *arg
)
70 cpuid
= hard_smp_processor_id();
72 /* Unblock the master CPU _only_ when the scheduler state
73 * of all secondary CPUs will be up-to-date, so after
74 * the SMP initialization the master will be just allowed
75 * to call the scheduler code.
77 sun4d_swap((unsigned long *)&cpu_callin_map
[cpuid
], 1);
78 local_ops
->cache_all();
81 while ((unsigned long)current_set
[cpuid
] < PAGE_OFFSET
)
84 while (current_set
[cpuid
]->cpu
!= cpuid
)
87 /* Fix idle thread fields. */
88 __asm__
__volatile__("ld [%0], %%g6\n\t"
89 : : "r" (¤t_set
[cpuid
])
90 : "memory" /* paranoid */);
92 cpu_leds
[cpuid
] = 0x9;
95 /* Attach to the address space of init_task. */
96 atomic_inc(&init_mm
.mm_count
);
97 current
->active_mm
= &init_mm
;
99 local_ops
->cache_all();
100 local_ops
->tlb_all();
102 while (!cpumask_test_cpu(cpuid
, &smp_commenced_mask
))
105 spin_lock_irqsave(&sun4d_imsk_lock
, flags
);
106 cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
107 spin_unlock_irqrestore(&sun4d_imsk_lock
, flags
);
111 * Cycle through the processors asking the PROM to start each one.
113 void __init
smp4d_boot_cpus(void)
117 current_set
[0] = NULL
;
118 local_ops
->cache_all();
121 int smp4d_boot_one_cpu(int i
, struct task_struct
*idle
)
123 unsigned long *entry
= &sun4d_cpu_startup
;
127 cpu_find_by_instance(i
, &cpu_node
, NULL
);
128 current_set
[i
] = task_thread_info(idle
);
130 * Initialize the contexts table
131 * Since the call to prom_startcpu() trashes the structure,
132 * we need to re-initialize it for each cpu
134 smp_penguin_ctable
.which_io
= 0;
135 smp_penguin_ctable
.phys_addr
= (unsigned int) srmmu_ctx_table_phys
;
136 smp_penguin_ctable
.reg_size
= 0;
138 /* whirrr, whirrr, whirrrrrrrrr... */
139 printk(KERN_INFO
"Starting CPU %d at %p\n", i
, entry
);
140 local_ops
->cache_all();
141 prom_startcpu(cpu_node
,
142 &smp_penguin_ctable
, 0, (char *)entry
);
144 printk(KERN_INFO
"prom_startcpu returned :)\n");
146 /* wheee... it's going... */
147 for (timeout
= 0; timeout
< 10000; timeout
++) {
148 if (cpu_callin_map
[i
])
153 if (!(cpu_callin_map
[i
])) {
154 printk(KERN_ERR
"Processor %d is stuck.\n", i
);
158 local_ops
->cache_all();
162 void __init
smp4d_smp_done(void)
167 /* setup cpu list for irq rotation */
170 for_each_online_cpu(i
) {
172 prev
= &cpu_data(i
).next
;
175 local_ops
->cache_all();
177 /* Ok, they are spinning and ready to go. */
178 smp_processors_ready
= 1;
179 sun4d_distribute_irqs();
182 /* Memory structure giving interrupt handler information about IPI generated */
183 struct sun4d_ipi_work
{
189 static DEFINE_PER_CPU_SHARED_ALIGNED(struct sun4d_ipi_work
, sun4d_ipi_work
);
191 /* Initialize IPIs on the SUN4D SMP machine */
192 static void __init
smp4d_ipi_init(void)
195 struct sun4d_ipi_work
*work
;
197 printk(KERN_INFO
"smp4d: setup IPI at IRQ %d\n", SUN4D_IPI_IRQ
);
199 for_each_possible_cpu(cpu
) {
200 work
= &per_cpu(sun4d_ipi_work
, cpu
);
201 work
->single
= work
->msk
= work
->resched
= 0;
205 void sun4d_ipi_interrupt(void)
207 struct sun4d_ipi_work
*work
= &__get_cpu_var(sun4d_ipi_work
);
211 smp_call_function_single_interrupt();
215 smp_call_function_interrupt();
219 smp_resched_interrupt();
223 /* +-------+-------------+-----------+------------------------------------+
224 * | bcast | devid | sid | levels mask |
225 * +-------+-------------+-----------+------------------------------------+
226 * 31 30 23 22 15 14 0
228 #define IGEN_MESSAGE(bcast, devid, sid, levels) \
229 (((bcast) << 31) | ((devid) << 23) | ((sid) << 15) | (levels))
231 static void sun4d_send_ipi(int cpu
, int level
)
233 cc_set_igen(IGEN_MESSAGE(0, cpu
<< 3, 6 + ((level
>> 1) & 7), 1 << (level
- 1)));
236 static void sun4d_ipi_single(int cpu
)
238 struct sun4d_ipi_work
*work
= &per_cpu(sun4d_ipi_work
, cpu
);
243 /* Generate IRQ on the CPU */
244 sun4d_send_ipi(cpu
, SUN4D_IPI_IRQ
);
247 static void sun4d_ipi_mask_one(int cpu
)
249 struct sun4d_ipi_work
*work
= &per_cpu(sun4d_ipi_work
, cpu
);
254 /* Generate IRQ on the CPU */
255 sun4d_send_ipi(cpu
, SUN4D_IPI_IRQ
);
258 static void sun4d_ipi_resched(int cpu
)
260 struct sun4d_ipi_work
*work
= &per_cpu(sun4d_ipi_work
, cpu
);
265 /* Generate IRQ on the CPU (any IRQ will cause resched) */
266 sun4d_send_ipi(cpu
, SUN4D_IPI_IRQ
);
269 static struct smp_funcall
{
276 unsigned char processors_in
[NR_CPUS
]; /* Set when ipi entered. */
277 unsigned char processors_out
[NR_CPUS
]; /* Set when ipi exited. */
278 } ccall_info
__attribute__((aligned(8)));
280 static DEFINE_SPINLOCK(cross_call_lock
);
282 /* Cross calls must be serialized, at least currently. */
283 static void sun4d_cross_call(smpfunc_t func
, cpumask_t mask
, unsigned long arg1
,
284 unsigned long arg2
, unsigned long arg3
,
287 if (smp_processors_ready
) {
288 register int high
= smp_highest_cpu
;
291 spin_lock_irqsave(&cross_call_lock
, flags
);
295 * If you make changes here, make sure
296 * gcc generates proper code...
298 register smpfunc_t f
asm("i0") = func
;
299 register unsigned long a1
asm("i1") = arg1
;
300 register unsigned long a2
asm("i2") = arg2
;
301 register unsigned long a3
asm("i3") = arg3
;
302 register unsigned long a4
asm("i4") = arg4
;
303 register unsigned long a5
asm("i5") = 0;
305 __asm__
__volatile__(
307 "std %2, [%6 + 8]\n\t"
308 "std %4, [%6 + 16]\n\t" : :
309 "r"(f
), "r"(a1
), "r"(a2
), "r"(a3
), "r"(a4
), "r"(a5
),
310 "r" (&ccall_info
.func
));
313 /* Init receive/complete mapping, plus fire the IPI's off. */
317 cpumask_clear_cpu(smp_processor_id(), &mask
);
318 cpumask_and(&mask
, cpu_online_mask
, &mask
);
319 for (i
= 0; i
<= high
; i
++) {
320 if (cpumask_test_cpu(i
, &mask
)) {
321 ccall_info
.processors_in
[i
] = 0;
322 ccall_info
.processors_out
[i
] = 0;
323 sun4d_send_ipi(i
, IRQ_CROSS_CALL
);
333 if (!cpumask_test_cpu(i
, &mask
))
335 while (!ccall_info
.processors_in
[i
])
337 } while (++i
<= high
);
341 if (!cpumask_test_cpu(i
, &mask
))
343 while (!ccall_info
.processors_out
[i
])
345 } while (++i
<= high
);
348 spin_unlock_irqrestore(&cross_call_lock
, flags
);
352 /* Running cross calls. */
353 void smp4d_cross_call_irq(void)
355 int i
= hard_smp_processor_id();
357 ccall_info
.processors_in
[i
] = 1;
358 ccall_info
.func(ccall_info
.arg1
, ccall_info
.arg2
, ccall_info
.arg3
,
359 ccall_info
.arg4
, ccall_info
.arg5
);
360 ccall_info
.processors_out
[i
] = 1;
363 void smp4d_percpu_timer_interrupt(struct pt_regs
*regs
)
365 struct pt_regs
*old_regs
;
366 int cpu
= hard_smp_processor_id();
367 struct clock_event_device
*ce
;
368 static int cpu_tick
[NR_CPUS
];
369 static char led_mask
[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
371 old_regs
= set_irq_regs(regs
);
372 bw_get_prof_limit(cpu
);
373 bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */
376 if (!(cpu_tick
[cpu
] & 15)) {
377 if (cpu_tick
[cpu
] == 0x60)
379 cpu_leds
[cpu
] = led_mask
[cpu_tick
[cpu
] >> 4];
383 ce
= &per_cpu(sparc32_clockevent
, cpu
);
386 ce
->event_handler(ce
);
389 set_irq_regs(old_regs
);
392 static const struct sparc32_ipi_ops sun4d_ipi_ops
= {
393 .cross_call
= sun4d_cross_call
,
394 .resched
= sun4d_ipi_resched
,
395 .single
= sun4d_ipi_single
,
396 .mask_one
= sun4d_ipi_mask_one
,
399 void __init
sun4d_init_smp(void)
403 /* Patch ipi15 trap table */
404 t_nmi
[1] = t_nmi
[1] + (linux_trap_ipi15_sun4d
- linux_trap_ipi15_sun4m
);
406 sparc32_ipi_ops
= &sun4d_ipi_ops
;
408 for (i
= 0; i
< NR_CPUS
; i
++) {
409 ccall_info
.processors_in
[i
] = 1;
410 ccall_info
.processors_out
[i
] = 1;