Merge branch 'master' of git://git.infradead.org/users/linville/wireless-next into...
[pandora-kernel.git] / arch / sparc / kernel / sun4m_irq.c
1 /*
2  * sun4m irq support
3  *
4  *  djhr: Hacked out of irq.c into a CPU dependent version.
5  *
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)
10  */
11
12 #include <asm/timer.h>
13 #include <asm/traps.h>
14 #include <asm/pgalloc.h>
15 #include <asm/pgtable.h>
16 #include <asm/irq.h>
17 #include <asm/io.h>
18 #include <asm/cacheflush.h>
19
20 #include "irq.h"
21 #include "kernel.h"
22
23 /* Sample sun4m IRQ layout:
24  *
25  * 0x22 - Power
26  * 0x24 - ESP SCSI
27  * 0x26 - Lance ethernet
28  * 0x2b - Floppy
29  * 0x2c - Zilog uart
30  * 0x32 - SBUS level 0
31  * 0x33 - Parallel port, SBUS level 1
32  * 0x35 - SBUS level 2
33  * 0x37 - SBUS level 3
34  * 0x39 - Audio, Graphics card, SBUS level 4
35  * 0x3b - SBUS level 5
36  * 0x3d - SBUS level 6
37  *
38  * Each interrupt source has a mask bit in the interrupt registers.
39  * When the mask bit is set, this blocks interrupt deliver.  So you
40  * clear the bit to enable the interrupt.
41  *
42  * Interrupts numbered less than 0x10 are software triggered interrupts
43  * and unused by Linux.
44  *
45  * Interrupt level assignment on sun4m:
46  *
47  *      level           source
48  * ------------------------------------------------------------
49  *        1             softint-1
50  *        2             softint-2, VME/SBUS level 1
51  *        3             softint-3, VME/SBUS level 2
52  *        4             softint-4, onboard SCSI
53  *        5             softint-5, VME/SBUS level 3
54  *        6             softint-6, onboard ETHERNET
55  *        7             softint-7, VME/SBUS level 4
56  *        8             softint-8, onboard VIDEO
57  *        9             softint-9, VME/SBUS level 5, Module Interrupt
58  *       10             softint-10, system counter/timer
59  *       11             softint-11, VME/SBUS level 6, Floppy
60  *       12             softint-12, Keyboard/Mouse, Serial
61  *       13             softint-13, VME/SBUS level 7, ISDN Audio
62  *       14             softint-14, per-processor counter/timer
63  *       15             softint-15, Asynchronous Errors (broadcast)
64  *
65  * Each interrupt source is masked distinctly in the sun4m interrupt
66  * registers.  The PIL level alone is therefore ambiguous, since multiple
67  * interrupt sources map to a single PIL.
68  *
69  * This ambiguity is resolved in the 'intr' property for device nodes
70  * in the OF device tree.  Each 'intr' property entry is composed of
71  * two 32-bit words.  The first word is the IRQ priority value, which
72  * is what we're intersted in.  The second word is the IRQ vector, which
73  * is unused.
74  *
75  * The low 4 bits of the IRQ priority indicate the PIL, and the upper
76  * 4 bits indicate onboard vs. SBUS leveled vs. VME leveled.  0x20
77  * means onboard, 0x30 means SBUS leveled, and 0x40 means VME leveled.
78  *
79  * For example, an 'intr' IRQ priority value of 0x24 is onboard SCSI
80  * whereas a value of 0x33 is SBUS level 2.  Here are some sample
81  * 'intr' property IRQ priority values from ss4, ss5, ss10, ss20, and
82  * Tadpole S3 GX systems.
83  *
84  * esp:         0x24    onboard ESP SCSI
85  * le:          0x26    onboard Lance ETHERNET
86  * p9100:       0x32    SBUS level 1 P9100 video
87  * bpp:         0x33    SBUS level 2 BPP parallel port device
88  * DBRI:        0x39    SBUS level 5 DBRI ISDN audio
89  * SUNW,leo:    0x39    SBUS level 5 LEO video
90  * pcmcia:      0x3b    SBUS level 6 PCMCIA controller
91  * uctrl:       0x3b    SBUS level 6 UCTRL device
92  * modem:       0x3d    SBUS level 7 MODEM
93  * zs:          0x2c    onboard keyboard/mouse/serial
94  * floppy:      0x2b    onboard Floppy
95  * power:       0x22    onboard power device (XXX unknown mask bit XXX)
96  */
97
98
99 /* Code in entry.S needs to get at these register mappings.  */
100 struct sun4m_irq_percpu __iomem *sun4m_irq_percpu[SUN4M_NCPUS];
101 struct sun4m_irq_global __iomem *sun4m_irq_global;
102
103 struct sun4m_handler_data {
104         bool    percpu;
105         long    mask;
106 };
107
108 /* Dave Redman (djhr@tadpole.co.uk)
109  * The sun4m interrupt registers.
110  */
111 #define SUN4M_INT_ENABLE        0x80000000
112 #define SUN4M_INT_E14           0x00000080
113 #define SUN4M_INT_E10           0x00080000
114
115 #define SUN4M_HARD_INT(x)       (0x000000001 << (x))
116 #define SUN4M_SOFT_INT(x)       (0x000010000 << (x))
117
118 #define SUN4M_INT_MASKALL       0x80000000        /* mask all interrupts */
119 #define SUN4M_INT_MODULE_ERR    0x40000000        /* module error */
120 #define SUN4M_INT_M2S_WRITE_ERR 0x20000000        /* write buffer error */
121 #define SUN4M_INT_ECC_ERR       0x10000000        /* ecc memory error */
122 #define SUN4M_INT_VME_ERR       0x08000000        /* vme async error */
123 #define SUN4M_INT_FLOPPY        0x00400000        /* floppy disk */
124 #define SUN4M_INT_MODULE        0x00200000        /* module interrupt */
125 #define SUN4M_INT_VIDEO         0x00100000        /* onboard video */
126 #define SUN4M_INT_REALTIME      0x00080000        /* system timer */
127 #define SUN4M_INT_SCSI          0x00040000        /* onboard scsi */
128 #define SUN4M_INT_AUDIO         0x00020000        /* audio/isdn */
129 #define SUN4M_INT_ETHERNET      0x00010000        /* onboard ethernet */
130 #define SUN4M_INT_SERIAL        0x00008000        /* serial ports */
131 #define SUN4M_INT_KBDMS         0x00004000        /* keyboard/mouse */
132 #define SUN4M_INT_SBUSBITS      0x00003F80        /* sbus int bits */
133 #define SUN4M_INT_VMEBITS       0x0000007F        /* vme int bits */
134
135 #define SUN4M_INT_ERROR         (SUN4M_INT_MODULE_ERR |    \
136                                  SUN4M_INT_M2S_WRITE_ERR | \
137                                  SUN4M_INT_ECC_ERR |       \
138                                  SUN4M_INT_VME_ERR)
139
140 #define SUN4M_INT_SBUS(x)       (1 << (x+7))
141 #define SUN4M_INT_VME(x)        (1 << (x))
142
143 /* Interrupt levels used by OBP */
144 #define OBP_INT_LEVEL_SOFT      0x10
145 #define OBP_INT_LEVEL_ONBOARD   0x20
146 #define OBP_INT_LEVEL_SBUS      0x30
147 #define OBP_INT_LEVEL_VME       0x40
148
149 #define SUN4M_TIMER_IRQ         (OBP_INT_LEVEL_ONBOARD | 10)
150 #define SUN4M_PROFILE_IRQ       (OBP_INT_LEVEL_ONBOARD | 14)
151
152 static unsigned long sun4m_imask[0x50] = {
153         /* 0x00 - SMP */
154         0,  SUN4M_SOFT_INT(1),
155         SUN4M_SOFT_INT(2),  SUN4M_SOFT_INT(3),
156         SUN4M_SOFT_INT(4),  SUN4M_SOFT_INT(5),
157         SUN4M_SOFT_INT(6),  SUN4M_SOFT_INT(7),
158         SUN4M_SOFT_INT(8),  SUN4M_SOFT_INT(9),
159         SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11),
160         SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13),
161         SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15),
162         /* 0x10 - soft */
163         0,  SUN4M_SOFT_INT(1),
164         SUN4M_SOFT_INT(2),  SUN4M_SOFT_INT(3),
165         SUN4M_SOFT_INT(4),  SUN4M_SOFT_INT(5),
166         SUN4M_SOFT_INT(6),  SUN4M_SOFT_INT(7),
167         SUN4M_SOFT_INT(8),  SUN4M_SOFT_INT(9),
168         SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11),
169         SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13),
170         SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15),
171         /* 0x20 - onboard */
172         0, 0, 0, 0,
173         SUN4M_INT_SCSI,  0, SUN4M_INT_ETHERNET, 0,
174         SUN4M_INT_VIDEO, SUN4M_INT_MODULE,
175         SUN4M_INT_REALTIME, SUN4M_INT_FLOPPY,
176         (SUN4M_INT_SERIAL | SUN4M_INT_KBDMS),
177         SUN4M_INT_AUDIO, SUN4M_INT_E14, SUN4M_INT_MODULE_ERR,
178         /* 0x30 - sbus */
179         0, 0, SUN4M_INT_SBUS(0), SUN4M_INT_SBUS(1),
180         0, SUN4M_INT_SBUS(2), 0, SUN4M_INT_SBUS(3),
181         0, SUN4M_INT_SBUS(4), 0, SUN4M_INT_SBUS(5),
182         0, SUN4M_INT_SBUS(6), 0, 0,
183         /* 0x40 - vme */
184         0, 0, SUN4M_INT_VME(0), SUN4M_INT_VME(1),
185         0, SUN4M_INT_VME(2), 0, SUN4M_INT_VME(3),
186         0, SUN4M_INT_VME(4), 0, SUN4M_INT_VME(5),
187         0, SUN4M_INT_VME(6), 0, 0
188 };
189
190 static void sun4m_mask_irq(struct irq_data *data)
191 {
192         struct sun4m_handler_data *handler_data = data->handler_data;
193         int cpu = smp_processor_id();
194
195         if (handler_data->mask) {
196                 unsigned long flags;
197
198                 local_irq_save(flags);
199                 if (handler_data->percpu) {
200                         sbus_writel(handler_data->mask, &sun4m_irq_percpu[cpu]->set);
201                 } else {
202                         sbus_writel(handler_data->mask, &sun4m_irq_global->mask_set);
203                 }
204                 local_irq_restore(flags);
205         }
206 }
207
208 static void sun4m_unmask_irq(struct irq_data *data)
209 {
210         struct sun4m_handler_data *handler_data = data->handler_data;
211         int cpu = smp_processor_id();
212
213         if (handler_data->mask) {
214                 unsigned long flags;
215
216                 local_irq_save(flags);
217                 if (handler_data->percpu) {
218                         sbus_writel(handler_data->mask, &sun4m_irq_percpu[cpu]->clear);
219                 } else {
220                         sbus_writel(handler_data->mask, &sun4m_irq_global->mask_clear);
221                 }
222                 local_irq_restore(flags);
223         }
224 }
225
226 static unsigned int sun4m_startup_irq(struct irq_data *data)
227 {
228         irq_link(data->irq);
229         sun4m_unmask_irq(data);
230         return 0;
231 }
232
233 static void sun4m_shutdown_irq(struct irq_data *data)
234 {
235         sun4m_mask_irq(data);
236         irq_unlink(data->irq);
237 }
238
239 static struct irq_chip sun4m_irq = {
240         .name           = "sun4m",
241         .irq_startup    = sun4m_startup_irq,
242         .irq_shutdown   = sun4m_shutdown_irq,
243         .irq_mask       = sun4m_mask_irq,
244         .irq_unmask     = sun4m_unmask_irq,
245 };
246
247
248 static unsigned int sun4m_build_device_irq(struct platform_device *op,
249                                            unsigned int real_irq)
250 {
251         struct sun4m_handler_data *handler_data;
252         unsigned int irq;
253         unsigned int pil;
254
255         if (real_irq >= OBP_INT_LEVEL_VME) {
256                 prom_printf("Bogus sun4m IRQ %u\n", real_irq);
257                 prom_halt();
258         }
259         pil = (real_irq & 0xf);
260         irq = irq_alloc(real_irq, pil);
261
262         if (irq == 0)
263                 goto out;
264
265         handler_data = irq_get_handler_data(irq);
266         if (unlikely(handler_data))
267                 goto out;
268
269         handler_data = kzalloc(sizeof(struct sun4m_handler_data), GFP_ATOMIC);
270         if (unlikely(!handler_data)) {
271                 prom_printf("IRQ: kzalloc(sun4m_handler_data) failed.\n");
272                 prom_halt();
273         }
274
275         handler_data->mask = sun4m_imask[real_irq];
276         handler_data->percpu = real_irq < OBP_INT_LEVEL_ONBOARD;
277         irq_set_chip_and_handler_name(irq, &sun4m_irq,
278                                       handle_level_irq, "level");
279         irq_set_handler_data(irq, handler_data);
280
281 out:
282         return irq;
283 }
284
285 #ifdef CONFIG_SMP
286 static void sun4m_send_ipi(int cpu, int level)
287 {
288         sbus_writel(SUN4M_SOFT_INT(level), &sun4m_irq_percpu[cpu]->set);
289 }
290
291 static void sun4m_clear_ipi(int cpu, int level)
292 {
293         sbus_writel(SUN4M_SOFT_INT(level), &sun4m_irq_percpu[cpu]->clear);
294 }
295
296 static void sun4m_set_udt(int cpu)
297 {
298         sbus_writel(cpu, &sun4m_irq_global->interrupt_target);
299 }
300 #endif
301
302 struct sun4m_timer_percpu {
303         u32             l14_limit;
304         u32             l14_count;
305         u32             l14_limit_noclear;
306         u32             user_timer_start_stop;
307 };
308
309 static struct sun4m_timer_percpu __iomem *timers_percpu[SUN4M_NCPUS];
310
311 struct sun4m_timer_global {
312         u32             l10_limit;
313         u32             l10_count;
314         u32             l10_limit_noclear;
315         u32             reserved;
316         u32             timer_config;
317 };
318
319 static struct sun4m_timer_global __iomem *timers_global;
320
321
322 unsigned int lvl14_resolution = (((1000000/HZ) + 1) << 10);
323
324 static void sun4m_clear_clock_irq(void)
325 {
326         sbus_readl(&timers_global->l10_limit);
327 }
328
329 void sun4m_nmi(struct pt_regs *regs)
330 {
331         unsigned long afsr, afar, si;
332
333         printk(KERN_ERR "Aieee: sun4m NMI received!\n");
334         /* XXX HyperSparc hack XXX */
335         __asm__ __volatile__("mov 0x500, %%g1\n\t"
336                              "lda [%%g1] 0x4, %0\n\t"
337                              "mov 0x600, %%g1\n\t"
338                              "lda [%%g1] 0x4, %1\n\t" :
339                              "=r" (afsr), "=r" (afar));
340         printk(KERN_ERR "afsr=%08lx afar=%08lx\n", afsr, afar);
341         si = sbus_readl(&sun4m_irq_global->pending);
342         printk(KERN_ERR "si=%08lx\n", si);
343         if (si & SUN4M_INT_MODULE_ERR)
344                 printk(KERN_ERR "Module async error\n");
345         if (si & SUN4M_INT_M2S_WRITE_ERR)
346                 printk(KERN_ERR "MBus/SBus async error\n");
347         if (si & SUN4M_INT_ECC_ERR)
348                 printk(KERN_ERR "ECC memory error\n");
349         if (si & SUN4M_INT_VME_ERR)
350                 printk(KERN_ERR "VME async error\n");
351         printk(KERN_ERR "you lose buddy boy...\n");
352         show_regs(regs);
353         prom_halt();
354 }
355
356 void sun4m_unmask_profile_irq(void)
357 {
358         unsigned long flags;
359
360         local_irq_save(flags);
361         sbus_writel(sun4m_imask[SUN4M_PROFILE_IRQ], &sun4m_irq_global->mask_clear);
362         local_irq_restore(flags);
363 }
364
365 void sun4m_clear_profile_irq(int cpu)
366 {
367         sbus_readl(&timers_percpu[cpu]->l14_limit);
368 }
369
370 static void sun4m_load_profile_irq(int cpu, unsigned int limit)
371 {
372         sbus_writel(limit, &timers_percpu[cpu]->l14_limit);
373 }
374
375 static void __init sun4m_init_timers(irq_handler_t counter_fn)
376 {
377         struct device_node *dp = of_find_node_by_name(NULL, "counter");
378         int i, err, len, num_cpu_timers;
379         unsigned int irq;
380         const u32 *addr;
381
382         if (!dp) {
383                 printk(KERN_ERR "sun4m_init_timers: No 'counter' node.\n");
384                 return;
385         }
386
387         addr = of_get_property(dp, "address", &len);
388         of_node_put(dp);
389         if (!addr) {
390                 printk(KERN_ERR "sun4m_init_timers: No 'address' prop.\n");
391                 return;
392         }
393
394         num_cpu_timers = (len / sizeof(u32)) - 1;
395         for (i = 0; i < num_cpu_timers; i++) {
396                 timers_percpu[i] = (void __iomem *)
397                         (unsigned long) addr[i];
398         }
399         timers_global = (void __iomem *)
400                 (unsigned long) addr[num_cpu_timers];
401
402         sbus_writel((((1000000/HZ) + 1) << 10), &timers_global->l10_limit);
403
404         master_l10_counter = &timers_global->l10_count;
405
406         irq = sun4m_build_device_irq(NULL, SUN4M_TIMER_IRQ);
407
408         err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
409         if (err) {
410                 printk(KERN_ERR "sun4m_init_timers: Register IRQ error %d.\n",
411                         err);
412                 return;
413         }
414
415         for (i = 0; i < num_cpu_timers; i++)
416                 sbus_writel(0, &timers_percpu[i]->l14_limit);
417         if (num_cpu_timers == 4)
418                 sbus_writel(SUN4M_INT_E14, &sun4m_irq_global->mask_set);
419
420 #ifdef CONFIG_SMP
421         {
422                 unsigned long flags;
423                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
424
425                 /* For SMP we use the level 14 ticker, however the bootup code
426                  * has copied the firmware's level 14 vector into the boot cpu's
427                  * trap table, we must fix this now or we get squashed.
428                  */
429                 local_irq_save(flags);
430                 trap_table->inst_one = lvl14_save[0];
431                 trap_table->inst_two = lvl14_save[1];
432                 trap_table->inst_three = lvl14_save[2];
433                 trap_table->inst_four = lvl14_save[3];
434                 local_flush_cache_all();
435                 local_irq_restore(flags);
436         }
437 #endif
438 }
439
440 void __init sun4m_init_IRQ(void)
441 {
442         struct device_node *dp = of_find_node_by_name(NULL, "interrupt");
443         int len, i, mid, num_cpu_iregs;
444         const u32 *addr;
445
446         if (!dp) {
447                 printk(KERN_ERR "sun4m_init_IRQ: No 'interrupt' node.\n");
448                 return;
449         }
450
451         addr = of_get_property(dp, "address", &len);
452         of_node_put(dp);
453         if (!addr) {
454                 printk(KERN_ERR "sun4m_init_IRQ: No 'address' prop.\n");
455                 return;
456         }
457
458         num_cpu_iregs = (len / sizeof(u32)) - 1;
459         for (i = 0; i < num_cpu_iregs; i++) {
460                 sun4m_irq_percpu[i] = (void __iomem *)
461                         (unsigned long) addr[i];
462         }
463         sun4m_irq_global = (void __iomem *)
464                 (unsigned long) addr[num_cpu_iregs];
465
466         local_irq_disable();
467
468         sbus_writel(~SUN4M_INT_MASKALL, &sun4m_irq_global->mask_set);
469         for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
470                 sbus_writel(~0x17fff, &sun4m_irq_percpu[mid]->clear);
471
472         if (num_cpu_iregs == 4)
473                 sbus_writel(0, &sun4m_irq_global->interrupt_target);
474
475         BTFIXUPSET_CALL(clear_clock_irq, sun4m_clear_clock_irq, BTFIXUPCALL_NORM);
476         BTFIXUPSET_CALL(load_profile_irq, sun4m_load_profile_irq, BTFIXUPCALL_NORM);
477
478         sparc_irq_config.init_timers = sun4m_init_timers;
479         sparc_irq_config.build_device_irq = sun4m_build_device_irq;
480
481 #ifdef CONFIG_SMP
482         BTFIXUPSET_CALL(set_cpu_int, sun4m_send_ipi, BTFIXUPCALL_NORM);
483         BTFIXUPSET_CALL(clear_cpu_int, sun4m_clear_ipi, BTFIXUPCALL_NORM);
484         BTFIXUPSET_CALL(set_irq_udt, sun4m_set_udt, BTFIXUPCALL_NORM);
485 #endif
486
487         /* Cannot enable interrupts until OBP ticker is disabled. */
488 }