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/config.h>
13 #include <linux/errno.h>
14 #include <linux/linkage.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/signal.h>
17 #include <linux/sched.h>
18 #include <linux/ptrace.h>
19 #include <linux/smp.h>
20 #include <linux/interrupt.h>
21 #include <linux/slab.h>
22 #include <linux/init.h>
23 #include <linux/ioport.h>
25 #include <asm/ptrace.h>
26 #include <asm/processor.h>
27 #include <asm/system.h>
29 #include <asm/vaddrs.h>
30 #include <asm/timer.h>
31 #include <asm/openprom.h>
32 #include <asm/oplib.h>
33 #include <asm/traps.h>
34 #include <asm/pgalloc.h>
35 #include <asm/pgtable.h>
40 #include <asm/cacheflush.h>
42 static unsigned long dummy;
44 struct sun4m_intregs *sun4m_interrupts;
45 unsigned long *irq_rcvreg = &dummy;
47 /* These tables only apply for interrupts greater than 15..
49 * any intr value below 0x10 is considered to be a soft-int
50 * this may be useful or it may not.. but that's how I've done it.
51 * and it won't clash with what OBP is telling us about devices.
53 * take an encoded intr value and lookup if it's valid
54 * then get the mask bits that match from irq_mask
56 * P3: Translation from irq 0x0d to mask 0x2000 is for MrCoffee.
58 static unsigned char irq_xlate[32] = {
59 /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
60 0, 0, 0, 0, 1, 0, 2, 0, 3, 0, 4, 5, 6, 14, 0, 7,
61 0, 0, 8, 9, 0, 10, 0, 11, 0, 12, 0, 13, 0, 14, 0, 0
64 static unsigned long irq_mask[] = {
65 0, /* illegal index */
66 SUN4M_INT_SCSI, /* 1 irq 4 */
67 SUN4M_INT_ETHERNET, /* 2 irq 6 */
68 SUN4M_INT_VIDEO, /* 3 irq 8 */
69 SUN4M_INT_REALTIME, /* 4 irq 10 */
70 SUN4M_INT_FLOPPY, /* 5 irq 11 */
71 (SUN4M_INT_SERIAL | SUN4M_INT_KBDMS), /* 6 irq 12 */
72 SUN4M_INT_MODULE_ERR, /* 7 irq 15 */
73 SUN4M_INT_SBUS(0), /* 8 irq 2 */
74 SUN4M_INT_SBUS(1), /* 9 irq 3 */
75 SUN4M_INT_SBUS(2), /* 10 irq 5 */
76 SUN4M_INT_SBUS(3), /* 11 irq 7 */
77 SUN4M_INT_SBUS(4), /* 12 irq 9 */
78 SUN4M_INT_SBUS(5), /* 13 irq 11 */
79 SUN4M_INT_SBUS(6) /* 14 irq 13 */
82 static int sun4m_pil_map[] = { 0, 2, 3, 5, 7, 9, 11, 13 };
84 unsigned int sun4m_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
86 if (sbint >= sizeof(sun4m_pil_map)) {
87 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
90 return sun4m_pil_map[sbint] | 0x30;
93 inline unsigned long sun4m_get_irqmask(unsigned int irq)
98 /* OBIO/SBUS interrupts */
100 mask = irq_mask[irq_xlate[irq]];
102 printk("sun4m_get_irqmask: IRQ%d has no valid mask!\n",irq);
104 /* Soft Interrupts will come here.
105 * Currently there is no way to trigger them but I'm sure
106 * something could be cooked up.
109 mask = SUN4M_SOFT_INT(irq);
114 static void sun4m_disable_irq(unsigned int irq_nr)
116 unsigned long mask, flags;
117 int cpu = smp_processor_id();
119 mask = sun4m_get_irqmask(irq_nr);
120 local_irq_save(flags);
122 sun4m_interrupts->set = mask;
124 sun4m_interrupts->cpu_intregs[cpu].set = mask;
125 local_irq_restore(flags);
128 static void sun4m_enable_irq(unsigned int irq_nr)
130 unsigned long mask, flags;
131 int cpu = smp_processor_id();
133 /* Dreadful floppy hack. When we use 0x2b instead of
134 * 0x0b the system blows (it starts to whistle!).
135 * So we continue to use 0x0b. Fixme ASAP. --P3
137 if (irq_nr != 0x0b) {
138 mask = sun4m_get_irqmask(irq_nr);
139 local_irq_save(flags);
141 sun4m_interrupts->clear = mask;
143 sun4m_interrupts->cpu_intregs[cpu].clear = mask;
144 local_irq_restore(flags);
146 local_irq_save(flags);
147 sun4m_interrupts->clear = SUN4M_INT_FLOPPY;
148 local_irq_restore(flags);
152 static unsigned long cpu_pil_to_imask[16] = {
155 /*2*/ SUN4M_INT_SBUS(0) | SUN4M_INT_VME(0),
156 /*3*/ SUN4M_INT_SBUS(1) | SUN4M_INT_VME(1),
157 /*4*/ SUN4M_INT_SCSI,
158 /*5*/ SUN4M_INT_SBUS(2) | SUN4M_INT_VME(2),
159 /*6*/ SUN4M_INT_ETHERNET,
160 /*7*/ SUN4M_INT_SBUS(3) | SUN4M_INT_VME(3),
161 /*8*/ SUN4M_INT_VIDEO,
162 /*9*/ SUN4M_INT_SBUS(4) | SUN4M_INT_VME(4) | SUN4M_INT_MODULE_ERR,
163 /*10*/ SUN4M_INT_REALTIME,
164 /*11*/ SUN4M_INT_SBUS(5) | SUN4M_INT_VME(5) | SUN4M_INT_FLOPPY,
165 /*12*/ SUN4M_INT_SERIAL | SUN4M_INT_KBDMS,
166 /*13*/ SUN4M_INT_AUDIO,
167 /*14*/ SUN4M_INT_E14,
171 /* We assume the caller has disabled local interrupts when these are called,
172 * or else very bizarre behavior will result.
174 static void sun4m_disable_pil_irq(unsigned int pil)
176 sun4m_interrupts->set = cpu_pil_to_imask[pil];
179 static void sun4m_enable_pil_irq(unsigned int pil)
181 sun4m_interrupts->clear = cpu_pil_to_imask[pil];
185 static void sun4m_send_ipi(int cpu, int level)
189 mask = sun4m_get_irqmask(level);
190 sun4m_interrupts->cpu_intregs[cpu].set = mask;
193 static void sun4m_clear_ipi(int cpu, int level)
197 mask = sun4m_get_irqmask(level);
198 sun4m_interrupts->cpu_intregs[cpu].clear = mask;
201 static void sun4m_set_udt(int cpu)
203 sun4m_interrupts->undirected_target = cpu;
207 #define OBIO_INTR 0x20
208 #define TIMER_IRQ (OBIO_INTR | 10)
209 #define PROFILE_IRQ (OBIO_INTR | 14)
211 struct sun4m_timer_regs *sun4m_timers;
212 unsigned int lvl14_resolution = (((1000000/HZ) + 1) << 10);
214 static void sun4m_clear_clock_irq(void)
216 volatile unsigned int clear_intr;
217 clear_intr = sun4m_timers->l10_timer_limit;
220 static void sun4m_clear_profile_irq(int cpu)
222 volatile unsigned int clear;
224 clear = sun4m_timers->cpu_timers[cpu].l14_timer_limit;
227 static void sun4m_load_profile_irq(int cpu, unsigned int limit)
229 sun4m_timers->cpu_timers[cpu].l14_timer_limit = limit;
232 char *sun4m_irq_itoa(unsigned int irq)
234 static char buff[16];
235 sprintf(buff, "%d", irq);
239 static void __init sun4m_init_timers(irqreturn_t (*counter_fn)(int, void *, struct pt_regs *))
241 int reg_count, irq, cpu;
242 struct linux_prom_registers cnt_regs[PROMREG_MAX];
243 int obio_node, cnt_node;
248 prom_searchsiblings (prom_getchild(prom_root_node), "obio")) == 0 ||
249 (obio_node = prom_getchild (obio_node)) == 0 ||
250 (cnt_node = prom_searchsiblings (obio_node, "counter")) == 0) {
251 prom_printf("Cannot find /obio/counter node\n");
254 reg_count = prom_getproperty(cnt_node, "reg",
255 (void *) cnt_regs, sizeof(cnt_regs));
256 reg_count = (reg_count/sizeof(struct linux_prom_registers));
258 /* Apply the obio ranges to the timer registers. */
259 prom_apply_obio_ranges(cnt_regs, reg_count);
261 cnt_regs[4].phys_addr = cnt_regs[reg_count-1].phys_addr;
262 cnt_regs[4].reg_size = cnt_regs[reg_count-1].reg_size;
263 cnt_regs[4].which_io = cnt_regs[reg_count-1].which_io;
264 for(obio_node = 1; obio_node < 4; obio_node++) {
265 cnt_regs[obio_node].phys_addr =
266 cnt_regs[obio_node-1].phys_addr + PAGE_SIZE;
267 cnt_regs[obio_node].reg_size = cnt_regs[obio_node-1].reg_size;
268 cnt_regs[obio_node].which_io = cnt_regs[obio_node-1].which_io;
271 memset((char*)&r, 0, sizeof(struct resource));
272 /* Map the per-cpu Counter registers. */
273 r.flags = cnt_regs[0].which_io;
274 r.start = cnt_regs[0].phys_addr;
275 sun4m_timers = (struct sun4m_timer_regs *) sbus_ioremap(&r, 0,
276 PAGE_SIZE*SUN4M_NCPUS, "sun4m_cpu_cnt");
277 /* Map the system Counter register. */
278 /* XXX Here we expect consequent calls to yeld adjusent maps. */
279 r.flags = cnt_regs[4].which_io;
280 r.start = cnt_regs[4].phys_addr;
281 sbus_ioremap(&r, 0, cnt_regs[4].reg_size, "sun4m_sys_cnt");
283 sun4m_timers->l10_timer_limit = (((1000000/HZ) + 1) << 10);
284 master_l10_counter = &sun4m_timers->l10_cur_count;
285 master_l10_limit = &sun4m_timers->l10_timer_limit;
287 irq = request_irq(TIMER_IRQ,
289 (SA_INTERRUPT | SA_STATIC_ALLOC),
292 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
296 if (!cpu_find_by_instance(1, NULL, NULL)) {
297 for(cpu = 0; cpu < 4; cpu++)
298 sun4m_timers->cpu_timers[cpu].l14_timer_limit = 0;
299 sun4m_interrupts->set = SUN4M_INT_E14;
301 sun4m_timers->cpu_timers[0].l14_timer_limit = 0;
306 extern unsigned long lvl14_save[4];
307 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
309 /* For SMP we use the level 14 ticker, however the bootup code
310 * has copied the firmwares level 14 vector into boot cpu's
311 * trap table, we must fix this now or we get squashed.
313 local_irq_save(flags);
314 trap_table->inst_one = lvl14_save[0];
315 trap_table->inst_two = lvl14_save[1];
316 trap_table->inst_three = lvl14_save[2];
317 trap_table->inst_four = lvl14_save[3];
318 local_flush_cache_all();
319 local_irq_restore(flags);
324 void __init sun4m_init_IRQ(void)
327 struct linux_prom_registers int_regs[PROMREG_MAX];
333 if((ie_node = prom_searchsiblings(prom_getchild(prom_root_node), "obio")) == 0 ||
334 (ie_node = prom_getchild (ie_node)) == 0 ||
335 (ie_node = prom_searchsiblings (ie_node, "interrupt")) == 0) {
336 prom_printf("Cannot find /obio/interrupt node\n");
339 num_regs = prom_getproperty(ie_node, "reg", (char *) int_regs,
341 num_regs = (num_regs/sizeof(struct linux_prom_registers));
343 /* Apply the obio ranges to these registers. */
344 prom_apply_obio_ranges(int_regs, num_regs);
346 int_regs[4].phys_addr = int_regs[num_regs-1].phys_addr;
347 int_regs[4].reg_size = int_regs[num_regs-1].reg_size;
348 int_regs[4].which_io = int_regs[num_regs-1].which_io;
349 for(ie_node = 1; ie_node < 4; ie_node++) {
350 int_regs[ie_node].phys_addr = int_regs[ie_node-1].phys_addr + PAGE_SIZE;
351 int_regs[ie_node].reg_size = int_regs[ie_node-1].reg_size;
352 int_regs[ie_node].which_io = int_regs[ie_node-1].which_io;
355 memset((char *)&r, 0, sizeof(struct resource));
356 /* Map the interrupt registers for all possible cpus. */
357 r.flags = int_regs[0].which_io;
358 r.start = int_regs[0].phys_addr;
359 sun4m_interrupts = (struct sun4m_intregs *) sbus_ioremap(&r, 0,
360 PAGE_SIZE*SUN4M_NCPUS, "interrupts_percpu");
362 /* Map the system interrupt control registers. */
363 r.flags = int_regs[4].which_io;
364 r.start = int_regs[4].phys_addr;
365 sbus_ioremap(&r, 0, int_regs[4].reg_size, "interrupts_system");
367 sun4m_interrupts->set = ~SUN4M_INT_MASKALL;
368 for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
369 sun4m_interrupts->cpu_intregs[mid].clear = ~0x17fff;
371 if (!cpu_find_by_instance(1, NULL, NULL)) {
372 /* system wide interrupts go to cpu 0, this should always
373 * be safe because it is guaranteed to be fitted or OBP doesn't
376 * Not sure, but writing here on SLAVIO systems may puke
377 * so I don't do it unless there is more than 1 cpu.
379 irq_rcvreg = (unsigned long *)
380 &sun4m_interrupts->undirected_target;
381 sun4m_interrupts->undirected_target = 0;
383 BTFIXUPSET_CALL(sbint_to_irq, sun4m_sbint_to_irq, BTFIXUPCALL_NORM);
384 BTFIXUPSET_CALL(enable_irq, sun4m_enable_irq, BTFIXUPCALL_NORM);
385 BTFIXUPSET_CALL(disable_irq, sun4m_disable_irq, BTFIXUPCALL_NORM);
386 BTFIXUPSET_CALL(enable_pil_irq, sun4m_enable_pil_irq, BTFIXUPCALL_NORM);
387 BTFIXUPSET_CALL(disable_pil_irq, sun4m_disable_pil_irq, BTFIXUPCALL_NORM);
388 BTFIXUPSET_CALL(clear_clock_irq, sun4m_clear_clock_irq, BTFIXUPCALL_NORM);
389 BTFIXUPSET_CALL(clear_profile_irq, sun4m_clear_profile_irq, BTFIXUPCALL_NORM);
390 BTFIXUPSET_CALL(load_profile_irq, sun4m_load_profile_irq, BTFIXUPCALL_NORM);
391 BTFIXUPSET_CALL(__irq_itoa, sun4m_irq_itoa, BTFIXUPCALL_NORM);
392 sparc_init_timers = sun4m_init_timers;
394 BTFIXUPSET_CALL(set_cpu_int, sun4m_send_ipi, BTFIXUPCALL_NORM);
395 BTFIXUPSET_CALL(clear_cpu_int, sun4m_clear_ipi, BTFIXUPCALL_NORM);
396 BTFIXUPSET_CALL(set_irq_udt, sun4m_set_udt, BTFIXUPCALL_NORM);
398 /* Cannot enable interrupts until OBP ticker is disabled. */