1 /*
2 * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com
4 *
5 * Common Codes for EXYNOS
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
15 #include <linux/io.h>
16 #include <linux/device.h>
17 #include <linux/gpio.h>
18 #include <linux/sched.h>
19 #include <linux/serial_core.h>
20 #include <linux/of.h>
21 #include <linux/of_irq.h>
22
23 #include <asm/proc-fns.h>
24 #include <asm/exception.h>
25 #include <asm/hardware/cache-l2x0.h>
26 #include <asm/hardware/gic.h>
27 #include <asm/mach/map.h>
28 #include <asm/mach/irq.h>
29
30 #include <mach/regs-irq.h>
31 #include <mach/regs-pmu.h>
32 #include <mach/regs-gpio.h>
33
34 #include <plat/cpu.h>
35 #include <plat/clock.h>
36 #include <plat/devs.h>
37 #include <plat/pm.h>
38 #include <plat/sdhci.h>
39 #include <plat/gpio-cfg.h>
40 #include <plat/adc-core.h>
41 #include <plat/fb-core.h>
42 #include <plat/fimc-core.h>
43 #include <plat/iic-core.h>
44 #include <plat/tv-core.h>
45 #include <plat/regs-serial.h>
46
47 #include "common.h"
48
49 static const char name_exynos4210[] = "EXYNOS4210";
50 static const char name_exynos4212[] = "EXYNOS4212";
51 static const char name_exynos4412[] = "EXYNOS4412";
52
53 static struct cpu_table cpu_ids[] __initdata = {
54 {
55 .idcode = EXYNOS4210_CPU_ID,
56 .idmask = EXYNOS4_CPU_MASK,
57 .map_io = exynos4_map_io,
58 .init_clocks = exynos4_init_clocks,
59 .init_uarts = exynos4_init_uarts,
60 .init = exynos_init,
61 .name = name_exynos4210,
62 }, {
63 .idcode = EXYNOS4212_CPU_ID,
64 .idmask = EXYNOS4_CPU_MASK,
65 .map_io = exynos4_map_io,
66 .init_clocks = exynos4_init_clocks,
67 .init_uarts = exynos4_init_uarts,
68 .init = exynos_init,
69 .name = name_exynos4212,
70 }, {
71 .idcode = EXYNOS4412_CPU_ID,
72 .idmask = EXYNOS4_CPU_MASK,
73 .map_io = exynos4_map_io,
74 .init_clocks = exynos4_init_clocks,
75 .init_uarts = exynos4_init_uarts,
76 .init = exynos_init,
77 .name = name_exynos4412,
78 },
79 };
80
81 /* Initial IO mappings */
82
83 static struct map_desc exynos_iodesc[] __initdata = {
84 {
85 .virtual = (unsigned long)S5P_VA_CHIPID,
86 .pfn = __phys_to_pfn(EXYNOS4_PA_CHIPID),
87 .length = SZ_4K,
88 .type = MT_DEVICE,
89 }, {
90 .virtual = (unsigned long)S3C_VA_SYS,
91 .pfn = __phys_to_pfn(EXYNOS4_PA_SYSCON),
92 .length = SZ_64K,
93 .type = MT_DEVICE,
94 }, {
95 .virtual = (unsigned long)S3C_VA_TIMER,
96 .pfn = __phys_to_pfn(EXYNOS4_PA_TIMER),
97 .length = SZ_16K,
98 .type = MT_DEVICE,
99 }, {
100 .virtual = (unsigned long)S3C_VA_WATCHDOG,
101 .pfn = __phys_to_pfn(EXYNOS4_PA_WATCHDOG),
102 .length = SZ_4K,
103 .type = MT_DEVICE,
104 }, {
105 .virtual = (unsigned long)S5P_VA_SROMC,
106 .pfn = __phys_to_pfn(EXYNOS4_PA_SROMC),
107 .length = SZ_4K,
108 .type = MT_DEVICE,
109 }, {
110 .virtual = (unsigned long)S5P_VA_SYSTIMER,
111 .pfn = __phys_to_pfn(EXYNOS4_PA_SYSTIMER),
112 .length = SZ_4K,
113 .type = MT_DEVICE,
114 }, {
115 .virtual = (unsigned long)S5P_VA_PMU,
116 .pfn = __phys_to_pfn(EXYNOS4_PA_PMU),
117 .length = SZ_64K,
118 .type = MT_DEVICE,
119 }, {
120 .virtual = (unsigned long)S5P_VA_COMBINER_BASE,
121 .pfn = __phys_to_pfn(EXYNOS4_PA_COMBINER),
122 .length = SZ_4K,
123 .type = MT_DEVICE,
124 }, {
125 .virtual = (unsigned long)S5P_VA_GIC_CPU,
126 .pfn = __phys_to_pfn(EXYNOS4_PA_GIC_CPU),
127 .length = SZ_64K,
128 .type = MT_DEVICE,
129 }, {
130 .virtual = (unsigned long)S5P_VA_GIC_DIST,
131 .pfn = __phys_to_pfn(EXYNOS4_PA_GIC_DIST),
132 .length = SZ_64K,
133 .type = MT_DEVICE,
134 }, {
135 .virtual = (unsigned long)S3C_VA_UART,
136 .pfn = __phys_to_pfn(EXYNOS4_PA_UART),
137 .length = SZ_512K,
138 .type = MT_DEVICE,
139 },
140 };
141
142 static struct map_desc exynos4_iodesc[] __initdata = {
143 {
144 .virtual = (unsigned long)S5P_VA_CMU,
145 .pfn = __phys_to_pfn(EXYNOS4_PA_CMU),
146 .length = SZ_128K,
147 .type = MT_DEVICE,
148 }, {
149 .virtual = (unsigned long)S5P_VA_COREPERI_BASE,
150 .pfn = __phys_to_pfn(EXYNOS4_PA_COREPERI),
151 .length = SZ_8K,
152 .type = MT_DEVICE,
153 }, {
154 .virtual = (unsigned long)S5P_VA_L2CC,
155 .pfn = __phys_to_pfn(EXYNOS4_PA_L2CC),
156 .length = SZ_4K,
157 .type = MT_DEVICE,
158 }, {
159 .virtual = (unsigned long)S5P_VA_GPIO1,
160 .pfn = __phys_to_pfn(EXYNOS4_PA_GPIO1),
161 .length = SZ_4K,
162 .type = MT_DEVICE,
163 }, {
164 .virtual = (unsigned long)S5P_VA_GPIO2,
165 .pfn = __phys_to_pfn(EXYNOS4_PA_GPIO2),
166 .length = SZ_4K,
167 .type = MT_DEVICE,
168 }, {
169 .virtual = (unsigned long)S5P_VA_GPIO3,
170 .pfn = __phys_to_pfn(EXYNOS4_PA_GPIO3),
171 .length = SZ_256,
172 .type = MT_DEVICE,
173 }, {
174 .virtual = (unsigned long)S5P_VA_DMC0,
175 .pfn = __phys_to_pfn(EXYNOS4_PA_DMC0),
176 .length = SZ_4K,
177 .type = MT_DEVICE,
178 }, {
179 .virtual = (unsigned long)S3C_VA_USB_HSPHY,
180 .pfn = __phys_to_pfn(EXYNOS4_PA_HSPHY),
181 .length = SZ_4K,
182 .type = MT_DEVICE,
183 },
184 };
185
186 static struct map_desc exynos4_iodesc0[] __initdata = {
187 {
188 .virtual = (unsigned long)S5P_VA_SYSRAM,
189 .pfn = __phys_to_pfn(EXYNOS4_PA_SYSRAM0),
190 .length = SZ_4K,
191 .type = MT_DEVICE,
192 },
193 };
194
195 static struct map_desc exynos4_iodesc1[] __initdata = {
196 {
197 .virtual = (unsigned long)S5P_VA_SYSRAM,
198 .pfn = __phys_to_pfn(EXYNOS4_PA_SYSRAM1),
199 .length = SZ_4K,
200 .type = MT_DEVICE,
201 },
202 };
203
exynos_idle(void)204 static void exynos_idle(void)
205 {
206 if (!need_resched())
207 cpu_do_idle();
208
209 local_irq_enable();
210 }
211
exynos4_restart(char mode,const char * cmd)212 void exynos4_restart(char mode, const char *cmd)
213 {
214 __raw_writel(0x1, S5P_SWRESET);
215 }
216
217 /*
218 * exynos_map_io
219 *
220 * register the standard cpu IO areas
221 */
222
exynos_init_io(struct map_desc * mach_desc,int size)223 void __init exynos_init_io(struct map_desc *mach_desc, int size)
224 {
225 /* initialize the io descriptors we need for initialization */
226 iotable_init(exynos_iodesc, ARRAY_SIZE(exynos_iodesc));
227 if (mach_desc)
228 iotable_init(mach_desc, size);
229
230 /* detect cpu id and rev. */
231 s5p_init_cpu(S5P_VA_CHIPID);
232
233 s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
234 }
235
exynos4_map_io(void)236 void __init exynos4_map_io(void)
237 {
238 iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
239
240 if (soc_is_exynos4210() && samsung_rev() == EXYNOS4210_REV_0)
241 iotable_init(exynos4_iodesc0, ARRAY_SIZE(exynos4_iodesc0));
242 else
243 iotable_init(exynos4_iodesc1, ARRAY_SIZE(exynos4_iodesc1));
244
245 /* initialize device information early */
246 exynos4_default_sdhci0();
247 exynos4_default_sdhci1();
248 exynos4_default_sdhci2();
249 exynos4_default_sdhci3();
250
251 s3c_adc_setname("samsung-adc-v3");
252
253 s3c_fimc_setname(0, "exynos4-fimc");
254 s3c_fimc_setname(1, "exynos4-fimc");
255 s3c_fimc_setname(2, "exynos4-fimc");
256 s3c_fimc_setname(3, "exynos4-fimc");
257
258 /* The I2C bus controllers are directly compatible with s3c2440 */
259 s3c_i2c0_setname("s3c2440-i2c");
260 s3c_i2c1_setname("s3c2440-i2c");
261 s3c_i2c2_setname("s3c2440-i2c");
262
263 s5p_fb_setname(0, "exynos4-fb");
264 s5p_hdmi_setname("exynos4-hdmi");
265 }
266
exynos4_init_clocks(int xtal)267 void __init exynos4_init_clocks(int xtal)
268 {
269 printk(KERN_DEBUG "%s: initializing clocks\n", __func__);
270
271 s3c24xx_register_baseclocks(xtal);
272 s5p_register_clocks(xtal);
273
274 if (soc_is_exynos4210())
275 exynos4210_register_clocks();
276 else if (soc_is_exynos4212() || soc_is_exynos4412())
277 exynos4212_register_clocks();
278
279 exynos4_register_clocks();
280 exynos4_setup_clocks();
281 }
282
283 #define COMBINER_ENABLE_SET 0x0
284 #define COMBINER_ENABLE_CLEAR 0x4
285 #define COMBINER_INT_STATUS 0xC
286
287 static DEFINE_SPINLOCK(irq_controller_lock);
288
289 struct combiner_chip_data {
290 unsigned int irq_offset;
291 unsigned int irq_mask;
292 void __iomem *base;
293 };
294
295 static struct combiner_chip_data combiner_data[MAX_COMBINER_NR];
296
combiner_base(struct irq_data * data)297 static inline void __iomem *combiner_base(struct irq_data *data)
298 {
299 struct combiner_chip_data *combiner_data =
300 irq_data_get_irq_chip_data(data);
301
302 return combiner_data->base;
303 }
304
combiner_mask_irq(struct irq_data * data)305 static void combiner_mask_irq(struct irq_data *data)
306 {
307 u32 mask = 1 << (data->irq % 32);
308
309 __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
310 }
311
combiner_unmask_irq(struct irq_data * data)312 static void combiner_unmask_irq(struct irq_data *data)
313 {
314 u32 mask = 1 << (data->irq % 32);
315
316 __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET);
317 }
318
combiner_handle_cascade_irq(unsigned int irq,struct irq_desc * desc)319 static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
320 {
321 struct combiner_chip_data *chip_data = irq_get_handler_data(irq);
322 struct irq_chip *chip = irq_get_chip(irq);
323 unsigned int cascade_irq, combiner_irq;
324 unsigned long status;
325
326 chained_irq_enter(chip, desc);
327
328 spin_lock(&irq_controller_lock);
329 status = __raw_readl(chip_data->base + COMBINER_INT_STATUS);
330 spin_unlock(&irq_controller_lock);
331 status &= chip_data->irq_mask;
332
333 if (status == 0)
334 goto out;
335
336 combiner_irq = __ffs(status);
337
338 cascade_irq = combiner_irq + (chip_data->irq_offset & ~31);
339 if (unlikely(cascade_irq >= NR_IRQS))
340 do_bad_IRQ(cascade_irq, desc);
341 else
342 generic_handle_irq(cascade_irq);
343
344 out:
345 chained_irq_exit(chip, desc);
346 }
347
348 static struct irq_chip combiner_chip = {
349 .name = "COMBINER",
350 .irq_mask = combiner_mask_irq,
351 .irq_unmask = combiner_unmask_irq,
352 };
353
combiner_cascade_irq(unsigned int combiner_nr,unsigned int irq)354 static void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq)
355 {
356 if (combiner_nr >= MAX_COMBINER_NR)
357 BUG();
358 if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0)
359 BUG();
360 irq_set_chained_handler(irq, combiner_handle_cascade_irq);
361 }
362
combiner_init(unsigned int combiner_nr,void __iomem * base,unsigned int irq_start)363 static void __init combiner_init(unsigned int combiner_nr, void __iomem *base,
364 unsigned int irq_start)
365 {
366 unsigned int i;
367
368 if (combiner_nr >= MAX_COMBINER_NR)
369 BUG();
370
371 combiner_data[combiner_nr].base = base;
372 combiner_data[combiner_nr].irq_offset = irq_start;
373 combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3);
374
375 /* Disable all interrupts */
376
377 __raw_writel(combiner_data[combiner_nr].irq_mask,
378 base + COMBINER_ENABLE_CLEAR);
379
380 /* Setup the Linux IRQ subsystem */
381
382 for (i = irq_start; i < combiner_data[combiner_nr].irq_offset
383 + MAX_IRQ_IN_COMBINER; i++) {
384 irq_set_chip_and_handler(i, &combiner_chip, handle_level_irq);
385 irq_set_chip_data(i, &combiner_data[combiner_nr]);
386 set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
387 }
388 }
389
390 #ifdef CONFIG_OF
391 static const struct of_device_id exynos4_dt_irq_match[] = {
392 { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
393 {},
394 };
395 #endif
396
exynos4_init_irq(void)397 void __init exynos4_init_irq(void)
398 {
399 int irq;
400 unsigned int gic_bank_offset;
401
402 gic_bank_offset = soc_is_exynos4412() ? 0x4000 : 0x8000;
403
404 if (!of_have_populated_dt())
405 gic_init_bases(0, IRQ_PPI(0), S5P_VA_GIC_DIST, S5P_VA_GIC_CPU, gic_bank_offset);
406 #ifdef CONFIG_OF
407 else
408 of_irq_init(exynos4_dt_irq_match);
409 #endif
410
411 for (irq = 0; irq < MAX_COMBINER_NR; irq++) {
412
413 combiner_init(irq, (void __iomem *)S5P_VA_COMBINER(irq),
414 COMBINER_IRQ(irq, 0));
415 combiner_cascade_irq(irq, IRQ_SPI(irq));
416 }
417
418 /*
419 * The parameters of s5p_init_irq() are for VIC init.
420 * Theses parameters should be NULL and 0 because EXYNOS4
421 * uses GIC instead of VIC.
422 */
423 s5p_init_irq(NULL, 0);
424 }
425
426 struct bus_type exynos4_subsys = {
427 .name = "exynos4-core",
428 .dev_name = "exynos4-core",
429 };
430
431 static struct device exynos4_dev = {
432 .bus = &exynos4_subsys,
433 };
434
exynos4_core_init(void)435 static int __init exynos4_core_init(void)
436 {
437 return subsys_system_register(&exynos4_subsys, NULL);
438 }
439 core_initcall(exynos4_core_init);
440
441 #ifdef CONFIG_CACHE_L2X0
exynos4_l2x0_cache_init(void)442 static int __init exynos4_l2x0_cache_init(void)
443 {
444 /* TAG, Data Latency Control: 2cycle */
445 __raw_writel(0x110, S5P_VA_L2CC + L2X0_TAG_LATENCY_CTRL);
446
447 if (soc_is_exynos4210())
448 __raw_writel(0x110, S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL);
449 else if (soc_is_exynos4212() || soc_is_exynos4412())
450 __raw_writel(0x120, S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL);
451
452 /* L2X0 Prefetch Control */
453 __raw_writel(0x30000007, S5P_VA_L2CC + L2X0_PREFETCH_CTRL);
454
455 /* L2X0 Power Control */
456 __raw_writel(L2X0_DYNAMIC_CLK_GATING_EN | L2X0_STNDBY_MODE_EN,
457 S5P_VA_L2CC + L2X0_POWER_CTRL);
458
459 l2x0_init(S5P_VA_L2CC, 0x7C470001, 0xC200ffff);
460
461 return 0;
462 }
463
464 early_initcall(exynos4_l2x0_cache_init);
465 #endif
466
exynos_init(void)467 int __init exynos_init(void)
468 {
469 printk(KERN_INFO "EXYNOS: Initializing architecture\n");
470
471 /* set idle function */
472 pm_idle = exynos_idle;
473
474 return device_register(&exynos4_dev);
475 }
476
477 /* uart registration process */
478
exynos4_init_uarts(struct s3c2410_uartcfg * cfg,int no)479 void __init exynos4_init_uarts(struct s3c2410_uartcfg *cfg, int no)
480 {
481 struct s3c2410_uartcfg *tcfg = cfg;
482 u32 ucnt;
483
484 for (ucnt = 0; ucnt < no; ucnt++, tcfg++)
485 tcfg->has_fracval = 1;
486
487 s3c24xx_init_uartdevs("exynos4210-uart", s5p_uart_resources, cfg, no);
488 }
489
490 static DEFINE_SPINLOCK(eint_lock);
491
492 static unsigned int eint0_15_data[16];
493
exynos4_get_irq_nr(unsigned int number)494 static unsigned int exynos4_get_irq_nr(unsigned int number)
495 {
496 u32 ret = 0;
497
498 switch (number) {
499 case 0 ... 3:
500 ret = (number + IRQ_EINT0);
501 break;
502 case 4 ... 7:
503 ret = (number + (IRQ_EINT4 - 4));
504 break;
505 case 8 ... 15:
506 ret = (number + (IRQ_EINT8 - 8));
507 break;
508 default:
509 printk(KERN_ERR "number available : %d\n", number);
510 }
511
512 return ret;
513 }
514
exynos4_irq_eint_mask(struct irq_data * data)515 static inline void exynos4_irq_eint_mask(struct irq_data *data)
516 {
517 u32 mask;
518
519 spin_lock(&eint_lock);
520 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(data->irq)));
521 mask |= eint_irq_to_bit(data->irq);
522 __raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(data->irq)));
523 spin_unlock(&eint_lock);
524 }
525
exynos4_irq_eint_unmask(struct irq_data * data)526 static void exynos4_irq_eint_unmask(struct irq_data *data)
527 {
528 u32 mask;
529
530 spin_lock(&eint_lock);
531 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(data->irq)));
532 mask &= ~(eint_irq_to_bit(data->irq));
533 __raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(data->irq)));
534 spin_unlock(&eint_lock);
535 }
536
exynos4_irq_eint_ack(struct irq_data * data)537 static inline void exynos4_irq_eint_ack(struct irq_data *data)
538 {
539 __raw_writel(eint_irq_to_bit(data->irq),
540 S5P_EINT_PEND(EINT_REG_NR(data->irq)));
541 }
542
exynos4_irq_eint_maskack(struct irq_data * data)543 static void exynos4_irq_eint_maskack(struct irq_data *data)
544 {
545 exynos4_irq_eint_mask(data);
546 exynos4_irq_eint_ack(data);
547 }
548
exynos4_irq_eint_set_type(struct irq_data * data,unsigned int type)549 static int exynos4_irq_eint_set_type(struct irq_data *data, unsigned int type)
550 {
551 int offs = EINT_OFFSET(data->irq);
552 int shift;
553 u32 ctrl, mask;
554 u32 newvalue = 0;
555
556 switch (type) {
557 case IRQ_TYPE_EDGE_RISING:
558 newvalue = S5P_IRQ_TYPE_EDGE_RISING;
559 break;
560
561 case IRQ_TYPE_EDGE_FALLING:
562 newvalue = S5P_IRQ_TYPE_EDGE_FALLING;
563 break;
564
565 case IRQ_TYPE_EDGE_BOTH:
566 newvalue = S5P_IRQ_TYPE_EDGE_BOTH;
567 break;
568
569 case IRQ_TYPE_LEVEL_LOW:
570 newvalue = S5P_IRQ_TYPE_LEVEL_LOW;
571 break;
572
573 case IRQ_TYPE_LEVEL_HIGH:
574 newvalue = S5P_IRQ_TYPE_LEVEL_HIGH;
575 break;
576
577 default:
578 printk(KERN_ERR "No such irq type %d", type);
579 return -EINVAL;
580 }
581
582 shift = (offs & 0x7) * 4;
583 mask = 0x7 << shift;
584
585 spin_lock(&eint_lock);
586 ctrl = __raw_readl(S5P_EINT_CON(EINT_REG_NR(data->irq)));
587 ctrl &= ~mask;
588 ctrl |= newvalue << shift;
589 __raw_writel(ctrl, S5P_EINT_CON(EINT_REG_NR(data->irq)));
590 spin_unlock(&eint_lock);
591
592 switch (offs) {
593 case 0 ... 7:
594 s3c_gpio_cfgpin(EINT_GPIO_0(offs & 0x7), EINT_MODE);
595 break;
596 case 8 ... 15:
597 s3c_gpio_cfgpin(EINT_GPIO_1(offs & 0x7), EINT_MODE);
598 break;
599 case 16 ... 23:
600 s3c_gpio_cfgpin(EINT_GPIO_2(offs & 0x7), EINT_MODE);
601 break;
602 case 24 ... 31:
603 s3c_gpio_cfgpin(EINT_GPIO_3(offs & 0x7), EINT_MODE);
604 break;
605 default:
606 printk(KERN_ERR "No such irq number %d", offs);
607 }
608
609 return 0;
610 }
611
612 static struct irq_chip exynos4_irq_eint = {
613 .name = "exynos4-eint",
614 .irq_mask = exynos4_irq_eint_mask,
615 .irq_unmask = exynos4_irq_eint_unmask,
616 .irq_mask_ack = exynos4_irq_eint_maskack,
617 .irq_ack = exynos4_irq_eint_ack,
618 .irq_set_type = exynos4_irq_eint_set_type,
619 #ifdef CONFIG_PM
620 .irq_set_wake = s3c_irqext_wake,
621 #endif
622 };
623
624 /*
625 * exynos4_irq_demux_eint
626 *
627 * This function demuxes the IRQ from from EINTs 16 to 31.
628 * It is designed to be inlined into the specific handler
629 * s5p_irq_demux_eintX_Y.
630 *
631 * Each EINT pend/mask registers handle eight of them.
632 */
exynos4_irq_demux_eint(unsigned int start)633 static inline void exynos4_irq_demux_eint(unsigned int start)
634 {
635 unsigned int irq;
636
637 u32 status = __raw_readl(S5P_EINT_PEND(EINT_REG_NR(start)));
638 u32 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(start)));
639
640 status &= ~mask;
641 status &= 0xff;
642
643 while (status) {
644 irq = fls(status) - 1;
645 generic_handle_irq(irq + start);
646 status &= ~(1 << irq);
647 }
648 }
649
exynos4_irq_demux_eint16_31(unsigned int irq,struct irq_desc * desc)650 static void exynos4_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
651 {
652 struct irq_chip *chip = irq_get_chip(irq);
653 chained_irq_enter(chip, desc);
654 exynos4_irq_demux_eint(IRQ_EINT(16));
655 exynos4_irq_demux_eint(IRQ_EINT(24));
656 chained_irq_exit(chip, desc);
657 }
658
exynos4_irq_eint0_15(unsigned int irq,struct irq_desc * desc)659 static void exynos4_irq_eint0_15(unsigned int irq, struct irq_desc *desc)
660 {
661 u32 *irq_data = irq_get_handler_data(irq);
662 struct irq_chip *chip = irq_get_chip(irq);
663
664 chained_irq_enter(chip, desc);
665 chip->irq_mask(&desc->irq_data);
666
667 if (chip->irq_ack)
668 chip->irq_ack(&desc->irq_data);
669
670 generic_handle_irq(*irq_data);
671
672 chip->irq_unmask(&desc->irq_data);
673 chained_irq_exit(chip, desc);
674 }
675
exynos4_init_irq_eint(void)676 int __init exynos4_init_irq_eint(void)
677 {
678 int irq;
679
680 for (irq = 0 ; irq <= 31 ; irq++) {
681 irq_set_chip_and_handler(IRQ_EINT(irq), &exynos4_irq_eint,
682 handle_level_irq);
683 set_irq_flags(IRQ_EINT(irq), IRQF_VALID);
684 }
685
686 irq_set_chained_handler(IRQ_EINT16_31, exynos4_irq_demux_eint16_31);
687
688 for (irq = 0 ; irq <= 15 ; irq++) {
689 eint0_15_data[irq] = IRQ_EINT(irq);
690
691 irq_set_handler_data(exynos4_get_irq_nr(irq),
692 &eint0_15_data[irq]);
693 irq_set_chained_handler(exynos4_get_irq_nr(irq),
694 exynos4_irq_eint0_15);
695 }
696
697 return 0;
698 }
699 arch_initcall(exynos4_init_irq_eint);
700