aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/sysdev/qe_lib/qe_ic.c
blob: b2b87c30e2665d1e4d133f284a6d2f72d5b77cf3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
/*
 * arch/powerpc/sysdev/qe_lib/qe_ic.c
 *
 * Copyright (C) 2006 Freescale Semiconductor, Inc.  All rights reserved.
 *
 * Author: Li Yang <leoli@freescale.com>
 * Based on code from Shlomi Gridish <gridish@freescale.com>
 *
 * QUICC ENGINE Interrupt Controller
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/device.h>
#include <linux/bootmem.h>
#include <linux/spinlock.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/qe_ic.h>

#include "qe_ic.h"

static DEFINE_RAW_SPINLOCK(qe_ic_lock);

static struct qe_ic_info qe_ic_info[] = {
	[1] = {
	       .mask = 0x00008000,
	       .mask_reg = QEIC_CIMR,
	       .pri_code = 0,
	       .pri_reg = QEIC_CIPWCC,
	       },
	[2] = {
	       .mask = 0x00004000,
	       .mask_reg = QEIC_CIMR,
	       .pri_code = 1,
	       .pri_reg = QEIC_CIPWCC,
	       },
	[3] = {
	       .mask = 0x00002000,
	       .mask_reg = QEIC_CIMR,
	       .pri_code = 2,
	       .pri_reg = QEIC_CIPWCC,
	       },
	[10] = {
		.mask = 0x00000040,
		.mask_reg = QEIC_CIMR,
		.pri_code = 1,
		.pri_reg = QEIC_CIPZCC,
		},
	[11] = {
		.mask = 0x00000020,
		.mask_reg = QEIC_CIMR,
		.pri_code = 2,
		.pri_reg = QEIC_CIPZCC,
		},
	[12] = {
		.mask = 0x00000010,
		.mask_reg = QEIC_CIMR,
		.pri_code = 3,
		.pri_reg = QEIC_CIPZCC,
		},
	[13] = {
		.mask = 0x00000008,
		.mask_reg = QEIC_CIMR,
		.pri_code = 4,
		.pri_reg = QEIC_CIPZCC,
		},
	[14] = {
		.mask = 0x00000004,
		.mask_reg = QEIC_CIMR,
		.pri_code = 5,
		.pri_reg = QEIC_CIPZCC,
		},
	[15] = {
		.mask = 0x00000002,
		.mask_reg = QEIC_CIMR,
		.pri_code = 6,
		.pri_reg = QEIC_CIPZCC,
		},
	[20] = {
		.mask = 0x10000000,
		.mask_reg = QEIC_CRIMR,
		.pri_code = 3,
		.pri_reg = QEIC_CIPRTA,
		},
	[25] = {
		.mask = 0x00800000,
		.mask_reg = QEIC_CRIMR,
		.pri_code = 0,
		.pri_reg = QEIC_CIPRTB,
		},
	[26] = {
		.mask = 0x00400000,
		.mask_reg = QEIC_CRIMR,
		.pri_code = 1,
		.pri_reg = QEIC_CIPRTB,
		},
	[27] = {
		.mask = 0x00200000,
		.mask_reg = QEIC_CRIMR,
		.pri_code = 2,
		.pri_reg = QEIC_CIPRTB,
		},
	[28] = {
		.mask = 0x00100000,
		.mask_reg = QEIC_CRIMR,
		.pri_code = 3,
		.pri_reg = QEIC_CIPRTB,
		},
	[32] = {
		.mask = 0x80000000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 0,
		.pri_reg = QEIC_CIPXCC,
		},
	[33] = {
		.mask = 0x40000000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 1,
		.pri_reg = QEIC_CIPXCC,
		},
	[34] = {
		.mask = 0x20000000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 2,
		.pri_reg = QEIC_CIPXCC,
		},
	[35] = {
		.mask = 0x10000000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 3,
		.pri_reg = QEIC_CIPXCC,
		},
	[36] = {
		.mask = 0x08000000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 4,
		.pri_reg = QEIC_CIPXCC,
		},
	[40] = {
		.mask = 0x00800000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 0,
		.pri_reg = QEIC_CIPYCC,
		},
	[41] = {
		.mask = 0x00400000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 1,
		.pri_reg = QEIC_CIPYCC,
		},
	[42] = {
		.mask = 0x00200000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 2,
		.pri_reg = QEIC_CIPYCC,
		},
	[43] = {
		.mask = 0x00100000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 3,
		.pri_reg = QEIC_CIPYCC,
		},
};

static inline u32 qe_ic_read(volatile __be32  __iomem * base, unsigned int reg)
{
	return in_be32(base + (reg >> 2));
}

static inline void qe_ic_write(volatile __be32  __iomem * base, unsigned int reg,
			       u32 value)
{
	out_be32(base + (reg >> 2), value);
}

static inline struct qe_ic *qe_ic_from_irq(unsigned int virq)
{
	return irq_get_chip_data(virq);
}

static inline struct qe_ic *qe_ic_from_irq_data(struct irq_data *d)
{
	return irq_data_get_irq_chip_data(d);
}

static void qe_ic_unmask_irq(struct irq_data *d)
{
	struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
	unsigned int src = irqd_to_hwirq(d);
	unsigned long flags;
	u32 temp;

	raw_spin_lock_irqsave(&qe_ic_lock, flags);

	temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
	qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
		    temp | qe_ic_info[src].mask);

	raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
}

static void qe_ic_mask_irq(struct irq_data *d)
{
	struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
	unsigned int src = irqd_to_hwirq(d);
	unsigned long flags;
	u32 temp;

	raw_spin_lock_irqsave(&qe_ic_lock, flags);

	temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
	qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
		    temp & ~qe_ic_info[src].mask);

	/* Flush the above write before enabling interrupts; otherwise,
	 * spurious interrupts will sometimes happen.  To be 100% sure
	 * that the write has reached the device before interrupts are
	 * enabled, the mask register would have to be read back; however,
	 * this is not required for correctness, only to avoid wasting
	 * time on a large number of spurious interrupts.  In testing,
	 * a sync reduced the observed spurious interrupts to zero.
	 */
	mb();

	raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
}

static struct irq_chip qe_ic_irq_chip = {
	.name = "QEIC",
	.irq_unmask = qe_ic_unmask_irq,
	.irq_mask = qe_ic_mask_irq,
	.irq_mask_ack = qe_ic_mask_irq,
};

static int qe_ic_host_match(struct irq_domain *h, struct device_node *node)
{
	/* Exact match, unless qe_ic node is NULL */
	return h->of_node == NULL || h->of_node == node;
}

static int qe_ic_host_map(struct irq_domain *h, unsigned int virq,
			  irq_hw_number_t hw)
{
	struct qe_ic *qe_ic = h->host_data;
	struct irq_chip *chip;

	if (qe_ic_info[hw].mask == 0) {
		printk(KERN_ERR "Can't map reserved IRQ\n");
		return -EINVAL;
	}
	/* Default chip */
	chip = &qe_ic->hc_irq;

	irq_set_chip_data(virq, qe_ic);
	irq_set_status_flags(virq, IRQ_LEVEL);

	irq_set_chip_and_handler(virq, chip, handle_level_irq);

	return 0;
}

static struct irq_domain_ops qe_ic_host_ops = {
	.match = qe_ic_host_match,
	.map = qe_ic_host_map,
	.xlate = irq_domain_xlate_onetwocell,
};

/* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
unsigned int qe_ic_get_low_irq(struct qe_ic *qe_ic)
{
	int irq;

	BUG_ON(qe_ic == NULL);

	/* get the interrupt source vector. */
	irq = qe_ic_read(qe_ic->regs, QEIC_CIVEC) >> 26;

	if (irq == 0)
		return NO_IRQ;

	return irq_linear_revmap(qe_ic->irqhost, irq);
}

/* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
unsigned int qe_ic_get_high_irq(struct qe_ic *qe_ic)
{
	int irq;

	BUG_ON(qe_ic == NULL);

	/* get the interrupt source vector. */
	irq = qe_ic_read(qe_ic->regs, QEIC_CHIVEC) >> 26;

	if (irq == 0)
		return NO_IRQ;

	return irq_linear_revmap(qe_ic->irqhost, irq);
}

void __init qe_ic_init(struct device_node *node, unsigned int flags,
		void (*low_handler)(unsigned int irq, struct irq_desc *desc),
		void (*high_handler)(unsigned int irq, struct irq_desc *desc))
{
	struct qe_ic *qe_ic;
	struct resource res;
	u32 temp = 0, ret, high_active = 0;

	ret = of_address_to_resource(node, 0, &res);
	if (ret)
		return;

	qe_ic = kzalloc(sizeof(*qe_ic), GFP_KERNEL);
	if (qe_ic == NULL)
		return;

	qe_ic->irqhost = irq_domain_add_linear(node, NR_QE_IC_INTS,
					       &qe_ic_host_ops, qe_ic);
	if (qe_ic->irqhost == NULL) {
		kfree(qe_ic);
		return;
	}

	qe_ic->regs = ioremap(res.start, resource_size(&res));

	qe_ic->hc_irq = qe_ic_irq_chip;

	qe_ic->virq_high = irq_of_parse_and_map(node, 0);
	qe_ic->virq_low = irq_of_parse_and_map(node, 1);

	if (qe_ic->virq_low == NO_IRQ) {
		printk(KERN_ERR "Failed to map QE_IC low IRQ\n");
		kfree(qe_ic);
		return;
	}

	/* default priority scheme is grouped. If spread mode is    */
	/* required, configure cicr accordingly.                    */
	if (flags & QE_IC_SPREADMODE_GRP_W)
		temp |= CICR_GWCC;
	if (flags & QE_IC_SPREADMODE_GRP_X)
		temp |= CICR_GXCC;
	if (flags & QE_IC_SPREADMODE_GRP_Y)
		temp |= CICR_GYCC;
	if (flags & QE_IC_SPREADMODE_GRP_Z)
		temp |= CICR_GZCC;
	if (flags & QE_IC_SPREADMODE_GRP_RISCA)
		temp |= CICR_GRTA;
	if (flags & QE_IC_SPREADMODE_GRP_RISCB)
		temp |= CICR_GRTB;

	/* choose destination signal for highest priority interrupt */
	if (flags & QE_IC_HIGH_SIGNAL) {
		temp |= (SIGNAL_HIGH << CICR_HPIT_SHIFT);
		high_active = 1;
	}

	qe_ic_write(qe_ic->regs, QEIC_CICR, temp);

	irq_set_handler_data(qe_ic->virq_low, qe_ic);
	irq_set_chained_handler(qe_ic->virq_low, low_handler);

	if (qe_ic->virq_high != NO_IRQ &&
			qe_ic->virq_high != qe_ic->virq_low) {
		irq_set_handler_data(qe_ic->virq_high, qe_ic);
		irq_set_chained_handler(qe_ic->virq_high, high_handler);
	}
}

void qe_ic_set_highest_priority(unsigned int virq, int high)
{
	struct qe_ic *qe_ic = qe_ic_from_irq(virq);
	unsigned int src = virq_to_hw(virq);
	u32 temp = 0;

	temp = qe_ic_read(qe_ic->regs, QEIC_CICR);

	temp &= ~CICR_HP_MASK;
	temp |= src << CICR_HP_SHIFT;

	temp &= ~CICR_HPIT_MASK;
	temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << CICR_HPIT_SHIFT;

	qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
}

/* Set Priority level within its group, from 1 to 8 */
int qe_ic_set_priority(unsigned int virq, unsigned int priority)
{
	struct qe_ic *qe_ic = qe_ic_from_irq(virq);
	unsigned int src = virq_to_hw(virq);
	u32 temp;

	if (priority > 8 || priority == 0)
		return -EINVAL;
	if (src > 127)
		return -EINVAL;
	if (qe_ic_info[src].pri_reg == 0)
		return -EINVAL;

	temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].pri_reg);

	if (priority < 4) {
		temp &= ~(0x7 << (32 - priority * 3));
		temp |= qe_ic_info[src].pri_code << (32 - priority * 3);
	} else {
		temp &= ~(0x7 << (24 - priority * 3));
		temp |= qe_ic_info[src].pri_code << (24 - priority * 3);
	}

	qe_ic_write(qe_ic->regs, qe_ic_info[src].pri_reg, temp);

	return 0;
}

/* Set a QE priority to use high irq, only priority 1~2 can use high irq */
int qe_ic_set_high_priority(unsigned int virq, unsigned int priority, int high)
{
	struct qe_ic *qe_ic = qe_ic_from_irq(virq);
	unsigned int src = virq_to_hw(virq);
	u32 temp, control_reg = QEIC_CICNR, shift = 0;

	if (priority > 2 || priority == 0)
		return -EINVAL;

	switch (qe_ic_info[src].pri_reg) {
	case QEIC_CIPZCC:
		shift = CICNR_ZCC1T_SHIFT;
		break;
	case QEIC_CIPWCC:
		shift = CICNR_WCC1T_SHIFT;
		break;
	case QEIC_CIPYCC:
		shift = CICNR_YCC1T_SHIFT;
		break;
	case QEIC_CIPXCC:
		shift = CICNR_XCC1T_SHIFT;
		break;
	case QEIC_CIPRTA:
		shift = CRICR_RTA1T_SHIFT;
		control_reg = QEIC_CRICR;
		break;
	case QEIC_CIPRTB:
		shift = CRICR_RTB1T_SHIFT;
		control_reg = QEIC_CRICR;
		break;
	default:
		return -EINVAL;
	}

	shift += (2 - priority) * 2;
	temp = qe_ic_read(qe_ic->regs, control_reg);
	temp &= ~(SIGNAL_MASK << shift);
	temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << shift;
	qe_ic_write(qe_ic->regs, control_reg, temp);

	return 0;
}

static struct bus_type qe_ic_subsys = {
	.name = "qe_ic",
	.dev_name = "qe_ic",
};

static struct device device_qe_ic = {
	.id = 0,
	.bus = &qe_ic_subsys,
};

static int __init init_qe_ic_sysfs(void)
{
	int rc;

	printk(KERN_DEBUG "Registering qe_ic with sysfs...\n");

	rc = subsys_system_register(&qe_ic_subsys, NULL);
	if (rc) {
		printk(KERN_ERR "Failed registering qe_ic sys class\n");
		return -ENODEV;
	}
	rc = device_register(&device_qe_ic);
	if (rc) {
		printk(KERN_ERR "Failed registering qe_ic sys device\n");
		return -ENODEV;
	}
	return 0;
}

subsys_initcall(init_qe_ic_sysfs);