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-rw-r--r--arch/mips/vr41xx/common/giu.c455
1 files changed, 455 insertions, 0 deletions
diff --git a/arch/mips/vr41xx/common/giu.c b/arch/mips/vr41xx/common/giu.c
new file mode 100644
index 000000000000..9c6b21a79e8f
--- /dev/null
+++ b/arch/mips/vr41xx/common/giu.c
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1/*
2 * giu.c, General-purpose I/O Unit Interrupt routines for NEC VR4100 series.
3 *
4 * Copyright (C) 2002 MontaVista Software Inc.
5 * Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com>
6 * Copyright (C) 2003-2004 Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
7 * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23/*
24 * Changes:
25 * MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
26 * - New creation, NEC VR4111, VR4121, VR4122 and VR4131 are supported.
27 *
28 * Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
29 * - Added support for NEC VR4133.
30 * - Removed board_irq_init.
31 */
32#include <linux/errno.h>
33#include <linux/init.h>
34#include <linux/irq.h>
35#include <linux/kernel.h>
36#include <linux/module.h>
37#include <linux/smp.h>
38#include <linux/types.h>
39
40#include <asm/cpu.h>
41#include <asm/io.h>
42#include <asm/vr41xx/vr41xx.h>
43
44#define GIUIOSELL_TYPE1 KSEG1ADDR(0x0b000100)
45#define GIUIOSELL_TYPE2 KSEG1ADDR(0x0f000140)
46
47#define GIUIOSELL 0x00
48#define GIUIOSELH 0x02
49#define GIUINTSTATL 0x08
50#define GIUINTSTATH 0x0a
51#define GIUINTENL 0x0c
52#define GIUINTENH 0x0e
53#define GIUINTTYPL 0x10
54#define GIUINTTYPH 0x12
55#define GIUINTALSELL 0x14
56#define GIUINTALSELH 0x16
57#define GIUINTHTSELL 0x18
58#define GIUINTHTSELH 0x1a
59#define GIUFEDGEINHL 0x20
60#define GIUFEDGEINHH 0x22
61#define GIUREDGEINHL 0x24
62#define GIUREDGEINHH 0x26
63
64static uint32_t giu_base;
65
66static struct irqaction giu_cascade = {
67 .handler = no_action,
68 .mask = CPU_MASK_NONE,
69 .name = "cascade",
70};
71
72#define read_giuint(offset) readw(giu_base + (offset))
73#define write_giuint(val, offset) writew((val), giu_base + (offset))
74
75#define GIUINT_HIGH_OFFSET 16
76
77static inline uint16_t set_giuint(uint8_t offset, uint16_t set)
78{
79 uint16_t res;
80
81 res = read_giuint(offset);
82 res |= set;
83 write_giuint(res, offset);
84
85 return res;
86}
87
88static inline uint16_t clear_giuint(uint8_t offset, uint16_t clear)
89{
90 uint16_t res;
91
92 res = read_giuint(offset);
93 res &= ~clear;
94 write_giuint(res, offset);
95
96 return res;
97}
98
99static unsigned int startup_giuint_low_irq(unsigned int irq)
100{
101 unsigned int pin;
102
103 pin = GIU_IRQ_TO_PIN(irq);
104 write_giuint((uint16_t)1 << pin, GIUINTSTATL);
105 set_giuint(GIUINTENL, (uint16_t)1 << pin);
106
107 return 0;
108}
109
110static void shutdown_giuint_low_irq(unsigned int irq)
111{
112 clear_giuint(GIUINTENL, (uint16_t)1 << GIU_IRQ_TO_PIN(irq));
113}
114
115static void enable_giuint_low_irq(unsigned int irq)
116{
117 set_giuint(GIUINTENL, (uint16_t)1 << GIU_IRQ_TO_PIN(irq));
118}
119
120#define disable_giuint_low_irq shutdown_giuint_low_irq
121
122static void ack_giuint_low_irq(unsigned int irq)
123{
124 unsigned int pin;
125
126 pin = GIU_IRQ_TO_PIN(irq);
127 clear_giuint(GIUINTENL, (uint16_t)1 << pin);
128 write_giuint((uint16_t)1 << pin, GIUINTSTATL);
129}
130
131static void end_giuint_low_irq(unsigned int irq)
132{
133 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
134 set_giuint(GIUINTENL, (uint16_t)1 << GIU_IRQ_TO_PIN(irq));
135}
136
137static struct hw_interrupt_type giuint_low_irq_type = {
138 .typename = "GIUINTL",
139 .startup = startup_giuint_low_irq,
140 .shutdown = shutdown_giuint_low_irq,
141 .enable = enable_giuint_low_irq,
142 .disable = disable_giuint_low_irq,
143 .ack = ack_giuint_low_irq,
144 .end = end_giuint_low_irq,
145};
146
147static unsigned int startup_giuint_high_irq(unsigned int irq)
148{
149 unsigned int pin;
150
151 pin = GIU_IRQ_TO_PIN(irq - GIUINT_HIGH_OFFSET);
152 write_giuint((uint16_t)1 << pin, GIUINTSTATH);
153 set_giuint(GIUINTENH, (uint16_t)1 << pin);
154
155 return 0;
156}
157
158static void shutdown_giuint_high_irq(unsigned int irq)
159{
160 clear_giuint(GIUINTENH, (uint16_t)1 << GIU_IRQ_TO_PIN(irq - GIUINT_HIGH_OFFSET));
161}
162
163static void enable_giuint_high_irq(unsigned int irq)
164{
165 set_giuint(GIUINTENH, (uint16_t)1 << GIU_IRQ_TO_PIN(irq - GIUINT_HIGH_OFFSET));
166}
167
168#define disable_giuint_high_irq shutdown_giuint_high_irq
169
170static void ack_giuint_high_irq(unsigned int irq)
171{
172 unsigned int pin;
173
174 pin = GIU_IRQ_TO_PIN(irq - GIUINT_HIGH_OFFSET);
175 clear_giuint(GIUINTENH, (uint16_t)1 << pin);
176 write_giuint((uint16_t)1 << pin, GIUINTSTATH);
177}
178
179static void end_giuint_high_irq(unsigned int irq)
180{
181 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
182 set_giuint(GIUINTENH, (uint16_t)1 << GIU_IRQ_TO_PIN(irq - GIUINT_HIGH_OFFSET));
183}
184
185static struct hw_interrupt_type giuint_high_irq_type = {
186 .typename = "GIUINTH",
187 .startup = startup_giuint_high_irq,
188 .shutdown = shutdown_giuint_high_irq,
189 .enable = enable_giuint_high_irq,
190 .disable = disable_giuint_high_irq,
191 .ack = ack_giuint_high_irq,
192 .end = end_giuint_high_irq,
193};
194
195void __init init_vr41xx_giuint_irq(void)
196{
197 int i;
198
199 for (i = GIU_IRQ_BASE; i <= GIU_IRQ_LAST; i++) {
200 if (i < (GIU_IRQ_BASE + GIUINT_HIGH_OFFSET))
201 irq_desc[i].handler = &giuint_low_irq_type;
202 else
203 irq_desc[i].handler = &giuint_high_irq_type;
204 }
205
206 setup_irq(GIUINT_CASCADE_IRQ, &giu_cascade);
207}
208
209void vr41xx_set_irq_trigger(int pin, int trigger, int hold)
210{
211 uint16_t mask;
212
213 if (pin < GIUINT_HIGH_OFFSET) {
214 mask = (uint16_t)1 << pin;
215 if (trigger != TRIGGER_LEVEL) {
216 set_giuint(GIUINTTYPL, mask);
217 if (hold == SIGNAL_HOLD)
218 set_giuint(GIUINTHTSELL, mask);
219 else
220 clear_giuint(GIUINTHTSELL, mask);
221 if (current_cpu_data.cputype == CPU_VR4133) {
222 switch (trigger) {
223 case TRIGGER_EDGE_FALLING:
224 set_giuint(GIUFEDGEINHL, mask);
225 clear_giuint(GIUREDGEINHL, mask);
226 break;
227 case TRIGGER_EDGE_RISING:
228 clear_giuint(GIUFEDGEINHL, mask);
229 set_giuint(GIUREDGEINHL, mask);
230 break;
231 default:
232 set_giuint(GIUFEDGEINHL, mask);
233 set_giuint(GIUREDGEINHL, mask);
234 break;
235 }
236 }
237 } else {
238 clear_giuint(GIUINTTYPL, mask);
239 clear_giuint(GIUINTHTSELL, mask);
240 }
241 write_giuint(mask, GIUINTSTATL);
242 } else {
243 mask = (uint16_t)1 << (pin - GIUINT_HIGH_OFFSET);
244 if (trigger != TRIGGER_LEVEL) {
245 set_giuint(GIUINTTYPH, mask);
246 if (hold == SIGNAL_HOLD)
247 set_giuint(GIUINTHTSELH, mask);
248 else
249 clear_giuint(GIUINTHTSELH, mask);
250 if (current_cpu_data.cputype == CPU_VR4133) {
251 switch (trigger) {
252 case TRIGGER_EDGE_FALLING:
253 set_giuint(GIUFEDGEINHH, mask);
254 clear_giuint(GIUREDGEINHH, mask);
255 break;
256 case TRIGGER_EDGE_RISING:
257 clear_giuint(GIUFEDGEINHH, mask);
258 set_giuint(GIUREDGEINHH, mask);
259 break;
260 default:
261 set_giuint(GIUFEDGEINHH, mask);
262 set_giuint(GIUREDGEINHH, mask);
263 break;
264 }
265 }
266 } else {
267 clear_giuint(GIUINTTYPH, mask);
268 clear_giuint(GIUINTHTSELH, mask);
269 }
270 write_giuint(mask, GIUINTSTATH);
271 }
272}
273
274EXPORT_SYMBOL(vr41xx_set_irq_trigger);
275
276void vr41xx_set_irq_level(int pin, int level)
277{
278 uint16_t mask;
279
280 if (pin < GIUINT_HIGH_OFFSET) {
281 mask = (uint16_t)1 << pin;
282 if (level == LEVEL_HIGH)
283 set_giuint(GIUINTALSELL, mask);
284 else
285 clear_giuint(GIUINTALSELL, mask);
286 write_giuint(mask, GIUINTSTATL);
287 } else {
288 mask = (uint16_t)1 << (pin - GIUINT_HIGH_OFFSET);
289 if (level == LEVEL_HIGH)
290 set_giuint(GIUINTALSELH, mask);
291 else
292 clear_giuint(GIUINTALSELH, mask);
293 write_giuint(mask, GIUINTSTATH);
294 }
295}
296
297EXPORT_SYMBOL(vr41xx_set_irq_level);
298
299#define GIUINT_NR_IRQS 32
300
301enum {
302 GIUINT_NO_CASCADE,
303 GIUINT_CASCADE
304};
305
306struct vr41xx_giuint_cascade {
307 unsigned int flag;
308 int (*get_irq_number)(int irq);
309};
310
311static struct vr41xx_giuint_cascade giuint_cascade[GIUINT_NR_IRQS];
312
313static int no_irq_number(int irq)
314{
315 return -EINVAL;
316}
317
318int vr41xx_cascade_irq(unsigned int irq, int (*get_irq_number)(int irq))
319{
320 unsigned int pin;
321 int retval;
322
323 if (irq < GIU_IRQ(0) || irq > GIU_IRQ(31))
324 return -EINVAL;
325
326 if(!get_irq_number)
327 return -EINVAL;
328
329 pin = GIU_IRQ_TO_PIN(irq);
330 giuint_cascade[pin].flag = GIUINT_CASCADE;
331 giuint_cascade[pin].get_irq_number = get_irq_number;
332
333 retval = setup_irq(irq, &giu_cascade);
334 if (retval != 0) {
335 giuint_cascade[pin].flag = GIUINT_NO_CASCADE;
336 giuint_cascade[pin].get_irq_number = no_irq_number;
337 }
338
339 return retval;
340}
341
342EXPORT_SYMBOL(vr41xx_cascade_irq);
343
344static inline int get_irq_pin_number(void)
345{
346 uint16_t pendl, pendh, maskl, maskh;
347 int i;
348
349 pendl = read_giuint(GIUINTSTATL);
350 pendh = read_giuint(GIUINTSTATH);
351 maskl = read_giuint(GIUINTENL);
352 maskh = read_giuint(GIUINTENH);
353
354 maskl &= pendl;
355 maskh &= pendh;
356
357 if (maskl) {
358 for (i = 0; i < 16; i++) {
359 if (maskl & ((uint16_t)1 << i))
360 return i;
361 }
362 } else if (maskh) {
363 for (i = 0; i < 16; i++) {
364 if (maskh & ((uint16_t)1 << i))
365 return i + GIUINT_HIGH_OFFSET;
366 }
367 }
368
369 printk(KERN_ERR "spurious GIU interrupt: %04x(%04x),%04x(%04x)\n",
370 maskl, pendl, maskh, pendh);
371
372 atomic_inc(&irq_err_count);
373
374 return -1;
375}
376
377static inline void ack_giuint_irq(int pin)
378{
379 if (pin < GIUINT_HIGH_OFFSET) {
380 clear_giuint(GIUINTENL, (uint16_t)1 << pin);
381 write_giuint((uint16_t)1 << pin, GIUINTSTATL);
382 } else {
383 pin -= GIUINT_HIGH_OFFSET;
384 clear_giuint(GIUINTENH, (uint16_t)1 << pin);
385 write_giuint((uint16_t)1 << pin, GIUINTSTATH);
386 }
387}
388
389static inline void end_giuint_irq(int pin)
390{
391 if (pin < GIUINT_HIGH_OFFSET)
392 set_giuint(GIUINTENL, (uint16_t)1 << pin);
393 else
394 set_giuint(GIUINTENH, (uint16_t)1 << (pin - GIUINT_HIGH_OFFSET));
395}
396
397void giuint_irq_dispatch(struct pt_regs *regs)
398{
399 struct vr41xx_giuint_cascade *cascade;
400 unsigned int giuint_irq;
401 int pin;
402
403 pin = get_irq_pin_number();
404 if (pin < 0)
405 return;
406
407 disable_irq(GIUINT_CASCADE_IRQ);
408
409 cascade = &giuint_cascade[pin];
410 giuint_irq = GIU_IRQ(pin);
411 if (cascade->flag == GIUINT_CASCADE) {
412 int irq = cascade->get_irq_number(giuint_irq);
413 ack_giuint_irq(pin);
414 if (irq >= 0)
415 do_IRQ(irq, regs);
416 end_giuint_irq(pin);
417 } else {
418 do_IRQ(giuint_irq, regs);
419 }
420
421 enable_irq(GIUINT_CASCADE_IRQ);
422}
423
424static int __init vr41xx_giu_init(void)
425{
426 int i;
427
428 switch (current_cpu_data.cputype) {
429 case CPU_VR4111:
430 case CPU_VR4121:
431 giu_base = GIUIOSELL_TYPE1;
432 break;
433 case CPU_VR4122:
434 case CPU_VR4131:
435 case CPU_VR4133:
436 giu_base = GIUIOSELL_TYPE2;
437 break;
438 default:
439 printk(KERN_ERR "GIU: Unexpected CPU of NEC VR4100 series\n");
440 return -EINVAL;
441 }
442
443 for (i = 0; i < GIUINT_NR_IRQS; i++) {
444 if (i < GIUINT_HIGH_OFFSET)
445 clear_giuint(GIUINTENL, (uint16_t)1 << i);
446 else
447 clear_giuint(GIUINTENH, (uint16_t)1 << (i - GIUINT_HIGH_OFFSET));
448 giuint_cascade[i].flag = GIUINT_NO_CASCADE;
449 giuint_cascade[i].get_irq_number = no_irq_number;
450 }
451
452 return 0;
453}
454
455early_initcall(vr41xx_giu_init);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-11 16:21:43 -0500