2 * arch/sparc/kernel/sun4m_irq.c:
4 * djhr: Hacked out of irq.c into a CPU dependent version.
6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
7 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
8 * Copyright (C) 1995 Pete A. Zaitcev (zaitcev@yahoo.com)
9 * Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
12 #include <linux/errno.h>
13 #include <linux/linkage.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/signal.h>
16 #include <linux/sched.h>
17 #include <linux/ptrace.h>
18 #include <linux/smp.h>
19 #include <linux/interrupt.h>
20 #include <linux/slab.h>
21 #include <linux/init.h>
22 #include <linux/ioport.h>
24 #include <asm/ptrace.h>
25 #include <asm/processor.h>
26 #include <asm/system.h>
28 #include <asm/vaddrs.h>
29 #include <asm/timer.h>
30 #include <asm/openprom.h>
31 #include <asm/oplib.h>
32 #include <asm/traps.h>
33 #include <asm/pgalloc.h>
34 #include <asm/pgtable.h>
39 #include <asm/cacheflush.h>
43 /* On the sun4m, just like the timers, we have both per-cpu and master
44 * interrupt registers.
47 /* These registers are used for sending/receiving irqs from/to
50 struct sun4m_intreg_percpu {
51 unsigned int tbt; /* Interrupts still pending for this cpu. */
53 /* These next two registers are WRITE-ONLY and are only
54 * "on bit" sensitive, "off bits" written have NO affect.
56 unsigned int clear; /* Clear this cpus irqs here. */
57 unsigned int set; /* Set this cpus irqs here. */
58 unsigned char space[PAGE_SIZE - 12];
63 * Actually the clear and set fields in this struct are misleading..
64 * according to the SLAVIO manual (and the same applies for the SEC)
65 * the clear field clears bits in the mask which will ENABLE that IRQ
66 * the set field sets bits in the mask to DISABLE the IRQ.
68 * Also the undirected_xx address in the SLAVIO is defined as
69 * RESERVED and write only..
71 * DAVEM_NOTE: The SLAVIO only specifies behavior on uniprocessor
72 * sun4m machines, for MP the layout makes more sense.
74 struct sun4m_intregs {
75 struct sun4m_intreg_percpu cpu_intregs[SUN4M_NCPUS];
76 unsigned int tbt; /* IRQ's that are still pending. */
77 unsigned int irqs; /* Master IRQ bits. */
79 /* Again, like the above, two these registers are WRITE-ONLY. */
80 unsigned int clear; /* Clear master IRQ's by setting bits here. */
81 unsigned int set; /* Set master IRQ's by setting bits here. */
83 /* This register is both READ and WRITE. */
84 unsigned int undirected_target; /* Which cpu gets undirected irqs. */
87 static unsigned long dummy;
89 struct sun4m_intregs *sun4m_interrupts;
90 unsigned long *irq_rcvreg = &dummy;
92 /* Dave Redman (djhr@tadpole.co.uk)
93 * The sun4m interrupt registers.
95 #define SUN4M_INT_ENABLE 0x80000000
96 #define SUN4M_INT_E14 0x00000080
97 #define SUN4M_INT_E10 0x00080000
99 #define SUN4M_HARD_INT(x) (0x000000001 << (x))
100 #define SUN4M_SOFT_INT(x) (0x000010000 << (x))
102 #define SUN4M_INT_MASKALL 0x80000000 /* mask all interrupts */
103 #define SUN4M_INT_MODULE_ERR 0x40000000 /* module error */
104 #define SUN4M_INT_M2S_WRITE 0x20000000 /* write buffer error */
105 #define SUN4M_INT_ECC 0x10000000 /* ecc memory error */
106 #define SUN4M_INT_FLOPPY 0x00400000 /* floppy disk */
107 #define SUN4M_INT_MODULE 0x00200000 /* module interrupt */
108 #define SUN4M_INT_VIDEO 0x00100000 /* onboard video */
109 #define SUN4M_INT_REALTIME 0x00080000 /* system timer */
110 #define SUN4M_INT_SCSI 0x00040000 /* onboard scsi */
111 #define SUN4M_INT_AUDIO 0x00020000 /* audio/isdn */
112 #define SUN4M_INT_ETHERNET 0x00010000 /* onboard ethernet */
113 #define SUN4M_INT_SERIAL 0x00008000 /* serial ports */
114 #define SUN4M_INT_KBDMS 0x00004000 /* keyboard/mouse */
115 #define SUN4M_INT_SBUSBITS 0x00003F80 /* sbus int bits */
117 #define SUN4M_INT_SBUS(x) (1 << (x+7))
118 #define SUN4M_INT_VME(x) (1 << (x))
120 /* These tables only apply for interrupts greater than 15..
122 * any intr value below 0x10 is considered to be a soft-int
123 * this may be useful or it may not.. but that's how I've done it.
124 * and it won't clash with what OBP is telling us about devices.
126 * take an encoded intr value and lookup if it's valid
127 * then get the mask bits that match from irq_mask
129 * P3: Translation from irq 0x0d to mask 0x2000 is for MrCoffee.
131 static unsigned char irq_xlate[32] = {
132 /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
133 0, 0, 0, 0, 1, 0, 2, 0, 3, 0, 4, 5, 6, 14, 0, 7,
134 0, 0, 8, 9, 0, 10, 0, 11, 0, 12, 0, 13, 0, 14, 0, 0
137 static unsigned long irq_mask[] = {
138 0, /* illegal index */
139 SUN4M_INT_SCSI, /* 1 irq 4 */
140 SUN4M_INT_ETHERNET, /* 2 irq 6 */
141 SUN4M_INT_VIDEO, /* 3 irq 8 */
142 SUN4M_INT_REALTIME, /* 4 irq 10 */
143 SUN4M_INT_FLOPPY, /* 5 irq 11 */
144 (SUN4M_INT_SERIAL | SUN4M_INT_KBDMS), /* 6 irq 12 */
145 SUN4M_INT_MODULE_ERR, /* 7 irq 15 */
146 SUN4M_INT_SBUS(0), /* 8 irq 2 */
147 SUN4M_INT_SBUS(1), /* 9 irq 3 */
148 SUN4M_INT_SBUS(2), /* 10 irq 5 */
149 SUN4M_INT_SBUS(3), /* 11 irq 7 */
150 SUN4M_INT_SBUS(4), /* 12 irq 9 */
151 SUN4M_INT_SBUS(5), /* 13 irq 11 */
152 SUN4M_INT_SBUS(6) /* 14 irq 13 */
155 static int sun4m_pil_map[] = { 0, 2, 3, 5, 7, 9, 11, 13 };
157 static unsigned int sun4m_sbint_to_irq(struct sbus_dev *sdev,
160 if (sbint >= sizeof(sun4m_pil_map)) {
161 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
164 return sun4m_pil_map[sbint] | 0x30;
167 static unsigned long sun4m_get_irqmask(unsigned int irq)
172 /* OBIO/SBUS interrupts */
174 mask = irq_mask[irq_xlate[irq]];
176 printk("sun4m_get_irqmask: IRQ%d has no valid mask!\n",irq);
178 /* Soft Interrupts will come here.
179 * Currently there is no way to trigger them but I'm sure
180 * something could be cooked up.
183 mask = SUN4M_SOFT_INT(irq);
188 static void sun4m_disable_irq(unsigned int irq_nr)
190 unsigned long mask, flags;
191 int cpu = smp_processor_id();
193 mask = sun4m_get_irqmask(irq_nr);
194 local_irq_save(flags);
196 sun4m_interrupts->set = mask;
198 sun4m_interrupts->cpu_intregs[cpu].set = mask;
199 local_irq_restore(flags);
202 static void sun4m_enable_irq(unsigned int irq_nr)
204 unsigned long mask, flags;
205 int cpu = smp_processor_id();
207 /* Dreadful floppy hack. When we use 0x2b instead of
208 * 0x0b the system blows (it starts to whistle!).
209 * So we continue to use 0x0b. Fixme ASAP. --P3
211 if (irq_nr != 0x0b) {
212 mask = sun4m_get_irqmask(irq_nr);
213 local_irq_save(flags);
215 sun4m_interrupts->clear = mask;
217 sun4m_interrupts->cpu_intregs[cpu].clear = mask;
218 local_irq_restore(flags);
220 local_irq_save(flags);
221 sun4m_interrupts->clear = SUN4M_INT_FLOPPY;
222 local_irq_restore(flags);
226 static unsigned long cpu_pil_to_imask[16] = {
229 /*2*/ SUN4M_INT_SBUS(0) | SUN4M_INT_VME(0),
230 /*3*/ SUN4M_INT_SBUS(1) | SUN4M_INT_VME(1),
231 /*4*/ SUN4M_INT_SCSI,
232 /*5*/ SUN4M_INT_SBUS(2) | SUN4M_INT_VME(2),
233 /*6*/ SUN4M_INT_ETHERNET,
234 /*7*/ SUN4M_INT_SBUS(3) | SUN4M_INT_VME(3),
235 /*8*/ SUN4M_INT_VIDEO,
236 /*9*/ SUN4M_INT_SBUS(4) | SUN4M_INT_VME(4) | SUN4M_INT_MODULE_ERR,
237 /*10*/ SUN4M_INT_REALTIME,
238 /*11*/ SUN4M_INT_SBUS(5) | SUN4M_INT_VME(5) | SUN4M_INT_FLOPPY,
239 /*12*/ SUN4M_INT_SERIAL | SUN4M_INT_KBDMS,
240 /*13*/ SUN4M_INT_AUDIO,
241 /*14*/ SUN4M_INT_E14,
245 /* We assume the caller has disabled local interrupts when these are called,
246 * or else very bizarre behavior will result.
248 static void sun4m_disable_pil_irq(unsigned int pil)
250 sun4m_interrupts->set = cpu_pil_to_imask[pil];
253 static void sun4m_enable_pil_irq(unsigned int pil)
255 sun4m_interrupts->clear = cpu_pil_to_imask[pil];
259 static void sun4m_send_ipi(int cpu, int level)
263 mask = sun4m_get_irqmask(level);
264 sun4m_interrupts->cpu_intregs[cpu].set = mask;
267 static void sun4m_clear_ipi(int cpu, int level)
271 mask = sun4m_get_irqmask(level);
272 sun4m_interrupts->cpu_intregs[cpu].clear = mask;
275 static void sun4m_set_udt(int cpu)
277 sun4m_interrupts->undirected_target = cpu;
281 #define OBIO_INTR 0x20
282 #define TIMER_IRQ (OBIO_INTR | 10)
283 #define PROFILE_IRQ (OBIO_INTR | 14)
285 static struct sun4m_timer_regs *sun4m_timers;
286 unsigned int lvl14_resolution = (((1000000/HZ) + 1) << 10);
288 static void sun4m_clear_clock_irq(void)
290 volatile unsigned int clear_intr;
291 clear_intr = sun4m_timers->l10_timer_limit;
294 static void sun4m_clear_profile_irq(int cpu)
296 volatile unsigned int clear;
298 clear = sun4m_timers->cpu_timers[cpu].l14_timer_limit;
301 static void sun4m_load_profile_irq(int cpu, unsigned int limit)
303 sun4m_timers->cpu_timers[cpu].l14_timer_limit = limit;
306 static void __init sun4m_init_timers(irq_handler_t counter_fn)
308 int reg_count, irq, cpu;
309 struct linux_prom_registers cnt_regs[PROMREG_MAX];
310 int obio_node, cnt_node;
315 prom_searchsiblings (prom_getchild(prom_root_node), "obio")) == 0 ||
316 (obio_node = prom_getchild (obio_node)) == 0 ||
317 (cnt_node = prom_searchsiblings (obio_node, "counter")) == 0) {
318 prom_printf("Cannot find /obio/counter node\n");
321 reg_count = prom_getproperty(cnt_node, "reg",
322 (void *) cnt_regs, sizeof(cnt_regs));
323 reg_count = (reg_count/sizeof(struct linux_prom_registers));
325 /* Apply the obio ranges to the timer registers. */
326 prom_apply_obio_ranges(cnt_regs, reg_count);
328 cnt_regs[4].phys_addr = cnt_regs[reg_count-1].phys_addr;
329 cnt_regs[4].reg_size = cnt_regs[reg_count-1].reg_size;
330 cnt_regs[4].which_io = cnt_regs[reg_count-1].which_io;
331 for(obio_node = 1; obio_node < 4; obio_node++) {
332 cnt_regs[obio_node].phys_addr =
333 cnt_regs[obio_node-1].phys_addr + PAGE_SIZE;
334 cnt_regs[obio_node].reg_size = cnt_regs[obio_node-1].reg_size;
335 cnt_regs[obio_node].which_io = cnt_regs[obio_node-1].which_io;
338 memset((char*)&r, 0, sizeof(struct resource));
339 /* Map the per-cpu Counter registers. */
340 r.flags = cnt_regs[0].which_io;
341 r.start = cnt_regs[0].phys_addr;
342 sun4m_timers = (struct sun4m_timer_regs *) sbus_ioremap(&r, 0,
343 PAGE_SIZE*SUN4M_NCPUS, "sun4m_cpu_cnt");
344 /* Map the system Counter register. */
345 /* XXX Here we expect consequent calls to yeld adjusent maps. */
346 r.flags = cnt_regs[4].which_io;
347 r.start = cnt_regs[4].phys_addr;
348 sbus_ioremap(&r, 0, cnt_regs[4].reg_size, "sun4m_sys_cnt");
350 sun4m_timers->l10_timer_limit = (((1000000/HZ) + 1) << 10);
351 master_l10_counter = &sun4m_timers->l10_cur_count;
352 master_l10_limit = &sun4m_timers->l10_timer_limit;
354 irq = request_irq(TIMER_IRQ,
356 (IRQF_DISABLED | SA_STATIC_ALLOC),
359 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
363 if (!cpu_find_by_instance(1, NULL, NULL)) {
364 for(cpu = 0; cpu < 4; cpu++)
365 sun4m_timers->cpu_timers[cpu].l14_timer_limit = 0;
366 sun4m_interrupts->set = SUN4M_INT_E14;
368 sun4m_timers->cpu_timers[0].l14_timer_limit = 0;
373 extern unsigned long lvl14_save[4];
374 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
376 /* For SMP we use the level 14 ticker, however the bootup code
377 * has copied the firmware's level 14 vector into the boot cpu's
378 * trap table, we must fix this now or we get squashed.
380 local_irq_save(flags);
381 trap_table->inst_one = lvl14_save[0];
382 trap_table->inst_two = lvl14_save[1];
383 trap_table->inst_three = lvl14_save[2];
384 trap_table->inst_four = lvl14_save[3];
385 local_flush_cache_all();
386 local_irq_restore(flags);
391 void __init sun4m_init_IRQ(void)
394 struct linux_prom_registers int_regs[PROMREG_MAX];
400 if((ie_node = prom_searchsiblings(prom_getchild(prom_root_node), "obio")) == 0 ||
401 (ie_node = prom_getchild (ie_node)) == 0 ||
402 (ie_node = prom_searchsiblings (ie_node, "interrupt")) == 0) {
403 prom_printf("Cannot find /obio/interrupt node\n");
406 num_regs = prom_getproperty(ie_node, "reg", (char *) int_regs,
408 num_regs = (num_regs/sizeof(struct linux_prom_registers));
410 /* Apply the obio ranges to these registers. */
411 prom_apply_obio_ranges(int_regs, num_regs);
413 int_regs[4].phys_addr = int_regs[num_regs-1].phys_addr;
414 int_regs[4].reg_size = int_regs[num_regs-1].reg_size;
415 int_regs[4].which_io = int_regs[num_regs-1].which_io;
416 for(ie_node = 1; ie_node < 4; ie_node++) {
417 int_regs[ie_node].phys_addr = int_regs[ie_node-1].phys_addr + PAGE_SIZE;
418 int_regs[ie_node].reg_size = int_regs[ie_node-1].reg_size;
419 int_regs[ie_node].which_io = int_regs[ie_node-1].which_io;
422 memset((char *)&r, 0, sizeof(struct resource));
423 /* Map the interrupt registers for all possible cpus. */
424 r.flags = int_regs[0].which_io;
425 r.start = int_regs[0].phys_addr;
426 sun4m_interrupts = (struct sun4m_intregs *) sbus_ioremap(&r, 0,
427 PAGE_SIZE*SUN4M_NCPUS, "interrupts_percpu");
429 /* Map the system interrupt control registers. */
430 r.flags = int_regs[4].which_io;
431 r.start = int_regs[4].phys_addr;
432 sbus_ioremap(&r, 0, int_regs[4].reg_size, "interrupts_system");
434 sun4m_interrupts->set = ~SUN4M_INT_MASKALL;
435 for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
436 sun4m_interrupts->cpu_intregs[mid].clear = ~0x17fff;
438 if (!cpu_find_by_instance(1, NULL, NULL)) {
439 /* system wide interrupts go to cpu 0, this should always
440 * be safe because it is guaranteed to be fitted or OBP doesn't
443 * Not sure, but writing here on SLAVIO systems may puke
444 * so I don't do it unless there is more than 1 cpu.
446 irq_rcvreg = (unsigned long *)
447 &sun4m_interrupts->undirected_target;
448 sun4m_interrupts->undirected_target = 0;
450 BTFIXUPSET_CALL(sbint_to_irq, sun4m_sbint_to_irq, BTFIXUPCALL_NORM);
451 BTFIXUPSET_CALL(enable_irq, sun4m_enable_irq, BTFIXUPCALL_NORM);
452 BTFIXUPSET_CALL(disable_irq, sun4m_disable_irq, BTFIXUPCALL_NORM);
453 BTFIXUPSET_CALL(enable_pil_irq, sun4m_enable_pil_irq, BTFIXUPCALL_NORM);
454 BTFIXUPSET_CALL(disable_pil_irq, sun4m_disable_pil_irq, BTFIXUPCALL_NORM);
455 BTFIXUPSET_CALL(clear_clock_irq, sun4m_clear_clock_irq, BTFIXUPCALL_NORM);
456 BTFIXUPSET_CALL(clear_profile_irq, sun4m_clear_profile_irq, BTFIXUPCALL_NORM);
457 BTFIXUPSET_CALL(load_profile_irq, sun4m_load_profile_irq, BTFIXUPCALL_NORM);
458 sparc_init_timers = sun4m_init_timers;
460 BTFIXUPSET_CALL(set_cpu_int, sun4m_send_ipi, BTFIXUPCALL_NORM);
461 BTFIXUPSET_CALL(clear_cpu_int, sun4m_clear_ipi, BTFIXUPCALL_NORM);
462 BTFIXUPSET_CALL(set_irq_udt, sun4m_set_udt, BTFIXUPCALL_NORM);
464 /* Cannot enable interrupts until OBP ticker is disabled. */