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98658538 LY |
1 | /* |
2 | * arch/powerpc/sysdev/qe_lib/qe_ic.c | |
3 | * | |
4 | * Copyright (C) 2006 Freescale Semicondutor, Inc. All rights reserved. | |
5 | * | |
6 | * Author: Li Yang <leoli@freescale.com> | |
7 | * Based on code from Shlomi Gridish <gridish@freescale.com> | |
8 | * | |
9 | * QUICC ENGINE Interrupt Controller | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/reboot.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/stddef.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/signal.h> | |
25 | #include <linux/sysdev.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/bootmem.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <asm/irq.h> | |
30 | #include <asm/io.h> | |
31 | #include <asm/prom.h> | |
32 | #include <asm/qe_ic.h> | |
33 | ||
34 | #include "qe_ic.h" | |
35 | ||
36 | static DEFINE_SPINLOCK(qe_ic_lock); | |
37 | ||
38 | static struct qe_ic_info qe_ic_info[] = { | |
39 | [1] = { | |
40 | .mask = 0x00008000, | |
41 | .mask_reg = QEIC_CIMR, | |
42 | .pri_code = 0, | |
43 | .pri_reg = QEIC_CIPWCC, | |
44 | }, | |
45 | [2] = { | |
46 | .mask = 0x00004000, | |
47 | .mask_reg = QEIC_CIMR, | |
48 | .pri_code = 1, | |
49 | .pri_reg = QEIC_CIPWCC, | |
50 | }, | |
51 | [3] = { | |
52 | .mask = 0x00002000, | |
53 | .mask_reg = QEIC_CIMR, | |
54 | .pri_code = 2, | |
55 | .pri_reg = QEIC_CIPWCC, | |
56 | }, | |
57 | [10] = { | |
58 | .mask = 0x00000040, | |
59 | .mask_reg = QEIC_CIMR, | |
60 | .pri_code = 1, | |
61 | .pri_reg = QEIC_CIPZCC, | |
62 | }, | |
63 | [11] = { | |
64 | .mask = 0x00000020, | |
65 | .mask_reg = QEIC_CIMR, | |
66 | .pri_code = 2, | |
67 | .pri_reg = QEIC_CIPZCC, | |
68 | }, | |
69 | [12] = { | |
70 | .mask = 0x00000010, | |
71 | .mask_reg = QEIC_CIMR, | |
72 | .pri_code = 3, | |
73 | .pri_reg = QEIC_CIPZCC, | |
74 | }, | |
75 | [13] = { | |
76 | .mask = 0x00000008, | |
77 | .mask_reg = QEIC_CIMR, | |
78 | .pri_code = 4, | |
79 | .pri_reg = QEIC_CIPZCC, | |
80 | }, | |
81 | [14] = { | |
82 | .mask = 0x00000004, | |
83 | .mask_reg = QEIC_CIMR, | |
84 | .pri_code = 5, | |
85 | .pri_reg = QEIC_CIPZCC, | |
86 | }, | |
87 | [15] = { | |
88 | .mask = 0x00000002, | |
89 | .mask_reg = QEIC_CIMR, | |
90 | .pri_code = 6, | |
91 | .pri_reg = QEIC_CIPZCC, | |
92 | }, | |
93 | [20] = { | |
94 | .mask = 0x10000000, | |
95 | .mask_reg = QEIC_CRIMR, | |
96 | .pri_code = 3, | |
97 | .pri_reg = QEIC_CIPRTA, | |
98 | }, | |
99 | [25] = { | |
100 | .mask = 0x00800000, | |
101 | .mask_reg = QEIC_CRIMR, | |
102 | .pri_code = 0, | |
103 | .pri_reg = QEIC_CIPRTB, | |
104 | }, | |
105 | [26] = { | |
106 | .mask = 0x00400000, | |
107 | .mask_reg = QEIC_CRIMR, | |
108 | .pri_code = 1, | |
109 | .pri_reg = QEIC_CIPRTB, | |
110 | }, | |
111 | [27] = { | |
112 | .mask = 0x00200000, | |
113 | .mask_reg = QEIC_CRIMR, | |
114 | .pri_code = 2, | |
115 | .pri_reg = QEIC_CIPRTB, | |
116 | }, | |
117 | [28] = { | |
118 | .mask = 0x00100000, | |
119 | .mask_reg = QEIC_CRIMR, | |
120 | .pri_code = 3, | |
121 | .pri_reg = QEIC_CIPRTB, | |
122 | }, | |
123 | [32] = { | |
124 | .mask = 0x80000000, | |
125 | .mask_reg = QEIC_CIMR, | |
126 | .pri_code = 0, | |
127 | .pri_reg = QEIC_CIPXCC, | |
128 | }, | |
129 | [33] = { | |
130 | .mask = 0x40000000, | |
131 | .mask_reg = QEIC_CIMR, | |
132 | .pri_code = 1, | |
133 | .pri_reg = QEIC_CIPXCC, | |
134 | }, | |
135 | [34] = { | |
136 | .mask = 0x20000000, | |
137 | .mask_reg = QEIC_CIMR, | |
138 | .pri_code = 2, | |
139 | .pri_reg = QEIC_CIPXCC, | |
140 | }, | |
141 | [35] = { | |
142 | .mask = 0x10000000, | |
143 | .mask_reg = QEIC_CIMR, | |
144 | .pri_code = 3, | |
145 | .pri_reg = QEIC_CIPXCC, | |
146 | }, | |
147 | [36] = { | |
148 | .mask = 0x08000000, | |
149 | .mask_reg = QEIC_CIMR, | |
150 | .pri_code = 4, | |
151 | .pri_reg = QEIC_CIPXCC, | |
152 | }, | |
153 | [40] = { | |
154 | .mask = 0x00800000, | |
155 | .mask_reg = QEIC_CIMR, | |
156 | .pri_code = 0, | |
157 | .pri_reg = QEIC_CIPYCC, | |
158 | }, | |
159 | [41] = { | |
160 | .mask = 0x00400000, | |
161 | .mask_reg = QEIC_CIMR, | |
162 | .pri_code = 1, | |
163 | .pri_reg = QEIC_CIPYCC, | |
164 | }, | |
165 | [42] = { | |
166 | .mask = 0x00200000, | |
167 | .mask_reg = QEIC_CIMR, | |
168 | .pri_code = 2, | |
169 | .pri_reg = QEIC_CIPYCC, | |
170 | }, | |
171 | [43] = { | |
172 | .mask = 0x00100000, | |
173 | .mask_reg = QEIC_CIMR, | |
174 | .pri_code = 3, | |
175 | .pri_reg = QEIC_CIPYCC, | |
176 | }, | |
177 | }; | |
178 | ||
179 | static inline u32 qe_ic_read(volatile __be32 __iomem * base, unsigned int reg) | |
180 | { | |
181 | return in_be32(base + (reg >> 2)); | |
182 | } | |
183 | ||
184 | static inline void qe_ic_write(volatile __be32 __iomem * base, unsigned int reg, | |
185 | u32 value) | |
186 | { | |
187 | out_be32(base + (reg >> 2), value); | |
188 | } | |
189 | ||
190 | static inline struct qe_ic *qe_ic_from_irq(unsigned int virq) | |
191 | { | |
6cff46f4 | 192 | return irq_to_desc(virq)->chip_data; |
98658538 LY |
193 | } |
194 | ||
195 | #define virq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq) | |
196 | ||
197 | static void qe_ic_unmask_irq(unsigned int virq) | |
198 | { | |
199 | struct qe_ic *qe_ic = qe_ic_from_irq(virq); | |
200 | unsigned int src = virq_to_hw(virq); | |
201 | unsigned long flags; | |
202 | u32 temp; | |
203 | ||
204 | spin_lock_irqsave(&qe_ic_lock, flags); | |
205 | ||
206 | temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg); | |
207 | qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg, | |
208 | temp | qe_ic_info[src].mask); | |
209 | ||
210 | spin_unlock_irqrestore(&qe_ic_lock, flags); | |
211 | } | |
212 | ||
213 | static void qe_ic_mask_irq(unsigned int virq) | |
214 | { | |
215 | struct qe_ic *qe_ic = qe_ic_from_irq(virq); | |
216 | unsigned int src = virq_to_hw(virq); | |
217 | unsigned long flags; | |
218 | u32 temp; | |
219 | ||
220 | spin_lock_irqsave(&qe_ic_lock, flags); | |
221 | ||
222 | temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg); | |
223 | qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg, | |
224 | temp & ~qe_ic_info[src].mask); | |
225 | ||
2c1d2f34 SW |
226 | /* Flush the above write before enabling interrupts; otherwise, |
227 | * spurious interrupts will sometimes happen. To be 100% sure | |
228 | * that the write has reached the device before interrupts are | |
229 | * enabled, the mask register would have to be read back; however, | |
230 | * this is not required for correctness, only to avoid wasting | |
231 | * time on a large number of spurious interrupts. In testing, | |
232 | * a sync reduced the observed spurious interrupts to zero. | |
233 | */ | |
234 | mb(); | |
98658538 LY |
235 | |
236 | spin_unlock_irqrestore(&qe_ic_lock, flags); | |
237 | } | |
238 | ||
239 | static struct irq_chip qe_ic_irq_chip = { | |
fc380c0c | 240 | .name = "QEIC", |
98658538 LY |
241 | .unmask = qe_ic_unmask_irq, |
242 | .mask = qe_ic_mask_irq, | |
2c1d2f34 | 243 | .mask_ack = qe_ic_mask_irq, |
98658538 LY |
244 | }; |
245 | ||
246 | static int qe_ic_host_match(struct irq_host *h, struct device_node *node) | |
247 | { | |
98658538 | 248 | /* Exact match, unless qe_ic node is NULL */ |
52964f87 | 249 | return h->of_node == NULL || h->of_node == node; |
98658538 LY |
250 | } |
251 | ||
252 | static int qe_ic_host_map(struct irq_host *h, unsigned int virq, | |
253 | irq_hw_number_t hw) | |
254 | { | |
255 | struct qe_ic *qe_ic = h->host_data; | |
256 | struct irq_chip *chip; | |
257 | ||
258 | if (qe_ic_info[hw].mask == 0) { | |
8354be9c | 259 | printk(KERN_ERR "Can't map reserved IRQ\n"); |
98658538 LY |
260 | return -EINVAL; |
261 | } | |
262 | /* Default chip */ | |
263 | chip = &qe_ic->hc_irq; | |
264 | ||
265 | set_irq_chip_data(virq, qe_ic); | |
6cff46f4 | 266 | irq_to_desc(virq)->status |= IRQ_LEVEL; |
98658538 LY |
267 | |
268 | set_irq_chip_and_handler(virq, chip, handle_level_irq); | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
273 | static int qe_ic_host_xlate(struct irq_host *h, struct device_node *ct, | |
40d50cf7 | 274 | const u32 * intspec, unsigned int intsize, |
98658538 LY |
275 | irq_hw_number_t * out_hwirq, |
276 | unsigned int *out_flags) | |
277 | { | |
278 | *out_hwirq = intspec[0]; | |
279 | if (intsize > 1) | |
280 | *out_flags = intspec[1]; | |
281 | else | |
282 | *out_flags = IRQ_TYPE_NONE; | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static struct irq_host_ops qe_ic_host_ops = { | |
287 | .match = qe_ic_host_match, | |
288 | .map = qe_ic_host_map, | |
289 | .xlate = qe_ic_host_xlate, | |
290 | }; | |
291 | ||
292 | /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */ | |
35a84c2f | 293 | unsigned int qe_ic_get_low_irq(struct qe_ic *qe_ic) |
98658538 LY |
294 | { |
295 | int irq; | |
296 | ||
297 | BUG_ON(qe_ic == NULL); | |
298 | ||
299 | /* get the interrupt source vector. */ | |
300 | irq = qe_ic_read(qe_ic->regs, QEIC_CIVEC) >> 26; | |
301 | ||
302 | if (irq == 0) | |
303 | return NO_IRQ; | |
304 | ||
305 | return irq_linear_revmap(qe_ic->irqhost, irq); | |
306 | } | |
307 | ||
308 | /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */ | |
35a84c2f | 309 | unsigned int qe_ic_get_high_irq(struct qe_ic *qe_ic) |
98658538 LY |
310 | { |
311 | int irq; | |
312 | ||
313 | BUG_ON(qe_ic == NULL); | |
314 | ||
315 | /* get the interrupt source vector. */ | |
316 | irq = qe_ic_read(qe_ic->regs, QEIC_CHIVEC) >> 26; | |
317 | ||
318 | if (irq == 0) | |
319 | return NO_IRQ; | |
320 | ||
321 | return irq_linear_revmap(qe_ic->irqhost, irq); | |
322 | } | |
323 | ||
cccd2102 AV |
324 | void __init qe_ic_init(struct device_node *node, unsigned int flags, |
325 | void (*low_handler)(unsigned int irq, struct irq_desc *desc), | |
326 | void (*high_handler)(unsigned int irq, struct irq_desc *desc)) | |
98658538 LY |
327 | { |
328 | struct qe_ic *qe_ic; | |
329 | struct resource res; | |
330 | u32 temp = 0, ret, high_active = 0; | |
331 | ||
2272a55f ME |
332 | ret = of_address_to_resource(node, 0, &res); |
333 | if (ret) | |
334 | return; | |
335 | ||
ea96025a | 336 | qe_ic = kzalloc(sizeof(*qe_ic), GFP_KERNEL); |
98658538 LY |
337 | if (qe_ic == NULL) |
338 | return; | |
339 | ||
19fc65b5 | 340 | qe_ic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR, |
98658538 | 341 | NR_QE_IC_INTS, &qe_ic_host_ops, 0); |
3475dd8a JL |
342 | if (qe_ic->irqhost == NULL) { |
343 | kfree(qe_ic); | |
98658538 | 344 | return; |
3475dd8a | 345 | } |
98658538 | 346 | |
98658538 LY |
347 | qe_ic->regs = ioremap(res.start, res.end - res.start + 1); |
348 | ||
349 | qe_ic->irqhost->host_data = qe_ic; | |
350 | qe_ic->hc_irq = qe_ic_irq_chip; | |
351 | ||
352 | qe_ic->virq_high = irq_of_parse_and_map(node, 0); | |
353 | qe_ic->virq_low = irq_of_parse_and_map(node, 1); | |
354 | ||
355 | if (qe_ic->virq_low == NO_IRQ) { | |
356 | printk(KERN_ERR "Failed to map QE_IC low IRQ\n"); | |
3475dd8a | 357 | kfree(qe_ic); |
98658538 LY |
358 | return; |
359 | } | |
360 | ||
361 | /* default priority scheme is grouped. If spread mode is */ | |
362 | /* required, configure cicr accordingly. */ | |
363 | if (flags & QE_IC_SPREADMODE_GRP_W) | |
364 | temp |= CICR_GWCC; | |
365 | if (flags & QE_IC_SPREADMODE_GRP_X) | |
366 | temp |= CICR_GXCC; | |
367 | if (flags & QE_IC_SPREADMODE_GRP_Y) | |
368 | temp |= CICR_GYCC; | |
369 | if (flags & QE_IC_SPREADMODE_GRP_Z) | |
370 | temp |= CICR_GZCC; | |
371 | if (flags & QE_IC_SPREADMODE_GRP_RISCA) | |
372 | temp |= CICR_GRTA; | |
373 | if (flags & QE_IC_SPREADMODE_GRP_RISCB) | |
374 | temp |= CICR_GRTB; | |
375 | ||
376 | /* choose destination signal for highest priority interrupt */ | |
377 | if (flags & QE_IC_HIGH_SIGNAL) { | |
378 | temp |= (SIGNAL_HIGH << CICR_HPIT_SHIFT); | |
379 | high_active = 1; | |
380 | } | |
381 | ||
382 | qe_ic_write(qe_ic->regs, QEIC_CICR, temp); | |
383 | ||
384 | set_irq_data(qe_ic->virq_low, qe_ic); | |
cccd2102 | 385 | set_irq_chained_handler(qe_ic->virq_low, low_handler); |
98658538 | 386 | |
cccd2102 AV |
387 | if (qe_ic->virq_high != NO_IRQ && |
388 | qe_ic->virq_high != qe_ic->virq_low) { | |
98658538 | 389 | set_irq_data(qe_ic->virq_high, qe_ic); |
cccd2102 | 390 | set_irq_chained_handler(qe_ic->virq_high, high_handler); |
98658538 | 391 | } |
98658538 LY |
392 | } |
393 | ||
394 | void qe_ic_set_highest_priority(unsigned int virq, int high) | |
395 | { | |
396 | struct qe_ic *qe_ic = qe_ic_from_irq(virq); | |
397 | unsigned int src = virq_to_hw(virq); | |
398 | u32 temp = 0; | |
399 | ||
400 | temp = qe_ic_read(qe_ic->regs, QEIC_CICR); | |
401 | ||
402 | temp &= ~CICR_HP_MASK; | |
403 | temp |= src << CICR_HP_SHIFT; | |
404 | ||
405 | temp &= ~CICR_HPIT_MASK; | |
406 | temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << CICR_HPIT_SHIFT; | |
407 | ||
408 | qe_ic_write(qe_ic->regs, QEIC_CICR, temp); | |
409 | } | |
410 | ||
411 | /* Set Priority level within its group, from 1 to 8 */ | |
412 | int qe_ic_set_priority(unsigned int virq, unsigned int priority) | |
413 | { | |
414 | struct qe_ic *qe_ic = qe_ic_from_irq(virq); | |
415 | unsigned int src = virq_to_hw(virq); | |
416 | u32 temp; | |
417 | ||
418 | if (priority > 8 || priority == 0) | |
419 | return -EINVAL; | |
420 | if (src > 127) | |
421 | return -EINVAL; | |
422 | if (qe_ic_info[src].pri_reg == 0) | |
423 | return -EINVAL; | |
424 | ||
425 | temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].pri_reg); | |
426 | ||
427 | if (priority < 4) { | |
428 | temp &= ~(0x7 << (32 - priority * 3)); | |
429 | temp |= qe_ic_info[src].pri_code << (32 - priority * 3); | |
430 | } else { | |
431 | temp &= ~(0x7 << (24 - priority * 3)); | |
432 | temp |= qe_ic_info[src].pri_code << (24 - priority * 3); | |
433 | } | |
434 | ||
435 | qe_ic_write(qe_ic->regs, qe_ic_info[src].pri_reg, temp); | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
440 | /* Set a QE priority to use high irq, only priority 1~2 can use high irq */ | |
441 | int qe_ic_set_high_priority(unsigned int virq, unsigned int priority, int high) | |
442 | { | |
443 | struct qe_ic *qe_ic = qe_ic_from_irq(virq); | |
444 | unsigned int src = virq_to_hw(virq); | |
445 | u32 temp, control_reg = QEIC_CICNR, shift = 0; | |
446 | ||
447 | if (priority > 2 || priority == 0) | |
448 | return -EINVAL; | |
449 | ||
450 | switch (qe_ic_info[src].pri_reg) { | |
451 | case QEIC_CIPZCC: | |
452 | shift = CICNR_ZCC1T_SHIFT; | |
453 | break; | |
454 | case QEIC_CIPWCC: | |
455 | shift = CICNR_WCC1T_SHIFT; | |
456 | break; | |
457 | case QEIC_CIPYCC: | |
458 | shift = CICNR_YCC1T_SHIFT; | |
459 | break; | |
460 | case QEIC_CIPXCC: | |
461 | shift = CICNR_XCC1T_SHIFT; | |
462 | break; | |
463 | case QEIC_CIPRTA: | |
464 | shift = CRICR_RTA1T_SHIFT; | |
465 | control_reg = QEIC_CRICR; | |
466 | break; | |
467 | case QEIC_CIPRTB: | |
468 | shift = CRICR_RTB1T_SHIFT; | |
469 | control_reg = QEIC_CRICR; | |
470 | break; | |
471 | default: | |
472 | return -EINVAL; | |
473 | } | |
474 | ||
475 | shift += (2 - priority) * 2; | |
476 | temp = qe_ic_read(qe_ic->regs, control_reg); | |
477 | temp &= ~(SIGNAL_MASK << shift); | |
478 | temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << shift; | |
479 | qe_ic_write(qe_ic->regs, control_reg, temp); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | static struct sysdev_class qe_ic_sysclass = { | |
af5ca3f4 | 485 | .name = "qe_ic", |
98658538 LY |
486 | }; |
487 | ||
488 | static struct sys_device device_qe_ic = { | |
489 | .id = 0, | |
490 | .cls = &qe_ic_sysclass, | |
491 | }; | |
492 | ||
493 | static int __init init_qe_ic_sysfs(void) | |
494 | { | |
495 | int rc; | |
496 | ||
497 | printk(KERN_DEBUG "Registering qe_ic with sysfs...\n"); | |
498 | ||
499 | rc = sysdev_class_register(&qe_ic_sysclass); | |
500 | if (rc) { | |
501 | printk(KERN_ERR "Failed registering qe_ic sys class\n"); | |
502 | return -ENODEV; | |
503 | } | |
504 | rc = sysdev_register(&device_qe_ic); | |
505 | if (rc) { | |
506 | printk(KERN_ERR "Failed registering qe_ic sys device\n"); | |
507 | return -ENODEV; | |
508 | } | |
509 | return 0; | |
510 | } | |
511 | ||
512 | subsys_initcall(init_qe_ic_sysfs); |