1 /* linux/arch/arm/plat-s3c24xx/irq.c
3 * Copyright (c) 2003,2004 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * 22-Jul-2004 Ben Dooks <ben@simtec.co.uk>
23 * Fixed compile warnings
25 * 22-Jul-2004 Roc Wu <cooloney@yahoo.com.cn>
26 * Fixed s3c_extirq_type
28 * 21-Jul-2004 Arnaud Patard (Rtp) <arnaud.patard@rtp-net.org>
29 * Addition of ADC/TC demux
31 * 04-Oct-2004 Klaus Fetscher <k.fetscher@fetron.de>
32 * Fix for set_irq_type() on low EINT numbers
34 * 05-Oct-2004 Ben Dooks <ben@simtec.co.uk>
35 * Tidy up KF's patch and sort out new release
37 * 05-Oct-2004 Ben Dooks <ben@simtec.co.uk>
38 * Add support for power management controls
40 * 04-Nov-2004 Ben Dooks
41 * Fix standard IRQ wake for EINT0..4 and RTC
43 * 22-Feb-2005 Ben Dooks
44 * Fixed edge-triggering on ADC IRQ
46 * 28-Jun-2005 Ben Dooks
49 * 25-Jul-2005 Ben Dooks
50 * Split the S3C2440 IRQ code to separate file
53 #include <linux/init.h>
54 #include <linux/module.h>
55 #include <linux/interrupt.h>
56 #include <linux/ioport.h>
57 #include <linux/sysdev.h>
60 #include <mach/hardware.h>
63 #include <asm/mach/irq.h>
65 #include <plat/regs-irqtype.h>
66 #include <mach/regs-irq.h>
67 #include <mach/regs-gpio.h>
73 /* wakeup irq control */
77 /* state for IRQs over sleep */
79 /* default is to allow for EINT0..EINT15, and IRQ_RTC as wakeup sources
81 * set bit to 1 in allow bitfield to enable the wakeup settings on it
84 unsigned long s3c_irqwake_intallow = 1L << (IRQ_RTC - IRQ_EINT0) | 0xfL;
85 unsigned long s3c_irqwake_intmask = 0xffffffffL;
86 unsigned long s3c_irqwake_eintallow = 0x0000fff0L;
87 unsigned long s3c_irqwake_eintmask = 0xffffffffL;
90 s3c_irq_wake(unsigned int irqno, unsigned int state)
92 unsigned long irqbit = 1 << (irqno - IRQ_EINT0);
94 if (!(s3c_irqwake_intallow & irqbit))
97 printk(KERN_INFO "wake %s for irq %d\n",
98 state ? "enabled" : "disabled", irqno);
101 s3c_irqwake_intmask |= irqbit;
103 s3c_irqwake_intmask &= ~irqbit;
109 s3c_irqext_wake(unsigned int irqno, unsigned int state)
111 unsigned long bit = 1L << (irqno - EXTINT_OFF);
113 if (!(s3c_irqwake_eintallow & bit))
116 printk(KERN_INFO "wake %s for irq %d\n",
117 state ? "enabled" : "disabled", irqno);
120 s3c_irqwake_eintmask |= bit;
122 s3c_irqwake_eintmask &= ~bit;
128 #define s3c_irqext_wake NULL
129 #define s3c_irq_wake NULL
134 s3c_irq_mask(unsigned int irqno)
140 mask = __raw_readl(S3C2410_INTMSK);
141 mask |= 1UL << irqno;
142 __raw_writel(mask, S3C2410_INTMSK);
146 s3c_irq_ack(unsigned int irqno)
148 unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
150 __raw_writel(bitval, S3C2410_SRCPND);
151 __raw_writel(bitval, S3C2410_INTPND);
155 s3c_irq_maskack(unsigned int irqno)
157 unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
160 mask = __raw_readl(S3C2410_INTMSK);
161 __raw_writel(mask|bitval, S3C2410_INTMSK);
163 __raw_writel(bitval, S3C2410_SRCPND);
164 __raw_writel(bitval, S3C2410_INTPND);
169 s3c_irq_unmask(unsigned int irqno)
173 if (irqno != IRQ_TIMER4 && irqno != IRQ_EINT8t23)
174 irqdbf2("s3c_irq_unmask %d\n", irqno);
178 mask = __raw_readl(S3C2410_INTMSK);
179 mask &= ~(1UL << irqno);
180 __raw_writel(mask, S3C2410_INTMSK);
183 struct irq_chip s3c_irq_level_chip = {
185 .ack = s3c_irq_maskack,
186 .mask = s3c_irq_mask,
187 .unmask = s3c_irq_unmask,
188 .set_wake = s3c_irq_wake
191 struct irq_chip s3c_irq_chip = {
194 .mask = s3c_irq_mask,
195 .unmask = s3c_irq_unmask,
196 .set_wake = s3c_irq_wake
200 s3c_irqext_mask(unsigned int irqno)
206 mask = __raw_readl(S3C24XX_EINTMASK);
207 mask |= ( 1UL << irqno);
208 __raw_writel(mask, S3C24XX_EINTMASK);
212 s3c_irqext_ack(unsigned int irqno)
218 bit = 1UL << (irqno - EXTINT_OFF);
220 mask = __raw_readl(S3C24XX_EINTMASK);
222 __raw_writel(bit, S3C24XX_EINTPEND);
224 req = __raw_readl(S3C24XX_EINTPEND);
227 /* not sure if we should be acking the parent irq... */
229 if (irqno <= IRQ_EINT7 ) {
230 if ((req & 0xf0) == 0)
231 s3c_irq_ack(IRQ_EINT4t7);
234 s3c_irq_ack(IRQ_EINT8t23);
239 s3c_irqext_unmask(unsigned int irqno)
245 mask = __raw_readl(S3C24XX_EINTMASK);
246 mask &= ~( 1UL << irqno);
247 __raw_writel(mask, S3C24XX_EINTMASK);
251 s3c_irqext_type(unsigned int irq, unsigned int type)
253 void __iomem *extint_reg;
254 void __iomem *gpcon_reg;
255 unsigned long gpcon_offset, extint_offset;
256 unsigned long newvalue = 0, value;
258 if ((irq >= IRQ_EINT0) && (irq <= IRQ_EINT3))
260 gpcon_reg = S3C2410_GPFCON;
261 extint_reg = S3C24XX_EXTINT0;
262 gpcon_offset = (irq - IRQ_EINT0) * 2;
263 extint_offset = (irq - IRQ_EINT0) * 4;
265 else if ((irq >= IRQ_EINT4) && (irq <= IRQ_EINT7))
267 gpcon_reg = S3C2410_GPFCON;
268 extint_reg = S3C24XX_EXTINT0;
269 gpcon_offset = (irq - (EXTINT_OFF)) * 2;
270 extint_offset = (irq - (EXTINT_OFF)) * 4;
272 else if ((irq >= IRQ_EINT8) && (irq <= IRQ_EINT15))
274 gpcon_reg = S3C2410_GPGCON;
275 extint_reg = S3C24XX_EXTINT1;
276 gpcon_offset = (irq - IRQ_EINT8) * 2;
277 extint_offset = (irq - IRQ_EINT8) * 4;
279 else if ((irq >= IRQ_EINT16) && (irq <= IRQ_EINT23))
281 gpcon_reg = S3C2410_GPGCON;
282 extint_reg = S3C24XX_EXTINT2;
283 gpcon_offset = (irq - IRQ_EINT8) * 2;
284 extint_offset = (irq - IRQ_EINT16) * 4;
288 /* Set the GPIO to external interrupt mode */
289 value = __raw_readl(gpcon_reg);
290 value = (value & ~(3 << gpcon_offset)) | (0x02 << gpcon_offset);
291 __raw_writel(value, gpcon_reg);
293 /* Set the external interrupt to pointed trigger type */
297 printk(KERN_WARNING "No edge setting!\n");
300 case IRQ_TYPE_EDGE_RISING:
301 newvalue = S3C2410_EXTINT_RISEEDGE;
304 case IRQ_TYPE_EDGE_FALLING:
305 newvalue = S3C2410_EXTINT_FALLEDGE;
308 case IRQ_TYPE_EDGE_BOTH:
309 newvalue = S3C2410_EXTINT_BOTHEDGE;
312 case IRQ_TYPE_LEVEL_LOW:
313 newvalue = S3C2410_EXTINT_LOWLEV;
316 case IRQ_TYPE_LEVEL_HIGH:
317 newvalue = S3C2410_EXTINT_HILEV;
321 printk(KERN_ERR "No such irq type %d", type);
325 value = __raw_readl(extint_reg);
326 value = (value & ~(7 << extint_offset)) | (newvalue << extint_offset);
327 __raw_writel(value, extint_reg);
332 static struct irq_chip s3c_irqext_chip = {
334 .mask = s3c_irqext_mask,
335 .unmask = s3c_irqext_unmask,
336 .ack = s3c_irqext_ack,
337 .set_type = s3c_irqext_type,
338 .set_wake = s3c_irqext_wake
341 static struct irq_chip s3c_irq_eint0t4 = {
344 .mask = s3c_irq_mask,
345 .unmask = s3c_irq_unmask,
346 .set_wake = s3c_irq_wake,
347 .set_type = s3c_irqext_type,
350 /* mask values for the parent registers for each of the interrupt types */
352 #define INTMSK_UART0 (1UL << (IRQ_UART0 - IRQ_EINT0))
353 #define INTMSK_UART1 (1UL << (IRQ_UART1 - IRQ_EINT0))
354 #define INTMSK_UART2 (1UL << (IRQ_UART2 - IRQ_EINT0))
355 #define INTMSK_ADCPARENT (1UL << (IRQ_ADCPARENT - IRQ_EINT0))
361 s3c_irq_uart0_mask(unsigned int irqno)
363 s3c_irqsub_mask(irqno, INTMSK_UART0, 7);
367 s3c_irq_uart0_unmask(unsigned int irqno)
369 s3c_irqsub_unmask(irqno, INTMSK_UART0);
373 s3c_irq_uart0_ack(unsigned int irqno)
375 s3c_irqsub_maskack(irqno, INTMSK_UART0, 7);
378 static struct irq_chip s3c_irq_uart0 = {
380 .mask = s3c_irq_uart0_mask,
381 .unmask = s3c_irq_uart0_unmask,
382 .ack = s3c_irq_uart0_ack,
388 s3c_irq_uart1_mask(unsigned int irqno)
390 s3c_irqsub_mask(irqno, INTMSK_UART1, 7 << 3);
394 s3c_irq_uart1_unmask(unsigned int irqno)
396 s3c_irqsub_unmask(irqno, INTMSK_UART1);
400 s3c_irq_uart1_ack(unsigned int irqno)
402 s3c_irqsub_maskack(irqno, INTMSK_UART1, 7 << 3);
405 static struct irq_chip s3c_irq_uart1 = {
407 .mask = s3c_irq_uart1_mask,
408 .unmask = s3c_irq_uart1_unmask,
409 .ack = s3c_irq_uart1_ack,
415 s3c_irq_uart2_mask(unsigned int irqno)
417 s3c_irqsub_mask(irqno, INTMSK_UART2, 7 << 6);
421 s3c_irq_uart2_unmask(unsigned int irqno)
423 s3c_irqsub_unmask(irqno, INTMSK_UART2);
427 s3c_irq_uart2_ack(unsigned int irqno)
429 s3c_irqsub_maskack(irqno, INTMSK_UART2, 7 << 6);
432 static struct irq_chip s3c_irq_uart2 = {
434 .mask = s3c_irq_uart2_mask,
435 .unmask = s3c_irq_uart2_unmask,
436 .ack = s3c_irq_uart2_ack,
439 /* ADC and Touchscreen */
442 s3c_irq_adc_mask(unsigned int irqno)
444 s3c_irqsub_mask(irqno, INTMSK_ADCPARENT, 3 << 9);
448 s3c_irq_adc_unmask(unsigned int irqno)
450 s3c_irqsub_unmask(irqno, INTMSK_ADCPARENT);
454 s3c_irq_adc_ack(unsigned int irqno)
456 s3c_irqsub_ack(irqno, INTMSK_ADCPARENT, 3 << 9);
459 static struct irq_chip s3c_irq_adc = {
461 .mask = s3c_irq_adc_mask,
462 .unmask = s3c_irq_adc_unmask,
463 .ack = s3c_irq_adc_ack,
466 /* irq demux for adc */
467 static void s3c_irq_demux_adc(unsigned int irq,
468 struct irq_desc *desc)
470 unsigned int subsrc, submsk;
471 unsigned int offset = 9;
473 /* read the current pending interrupts, and the mask
474 * for what it is available */
476 subsrc = __raw_readl(S3C2410_SUBSRCPND);
477 submsk = __raw_readl(S3C2410_INTSUBMSK);
485 generic_handle_irq(IRQ_TC);
488 generic_handle_irq(IRQ_ADC);
493 static void s3c_irq_demux_uart(unsigned int start)
495 unsigned int subsrc, submsk;
496 unsigned int offset = start - IRQ_S3CUART_RX0;
498 /* read the current pending interrupts, and the mask
499 * for what it is available */
501 subsrc = __raw_readl(S3C2410_SUBSRCPND);
502 submsk = __raw_readl(S3C2410_INTSUBMSK);
504 irqdbf2("s3c_irq_demux_uart: start=%d (%d), subsrc=0x%08x,0x%08x\n",
505 start, offset, subsrc, submsk);
513 generic_handle_irq(start);
516 generic_handle_irq(start+1);
519 generic_handle_irq(start+2);
523 /* uart demux entry points */
526 s3c_irq_demux_uart0(unsigned int irq,
527 struct irq_desc *desc)
530 s3c_irq_demux_uart(IRQ_S3CUART_RX0);
534 s3c_irq_demux_uart1(unsigned int irq,
535 struct irq_desc *desc)
538 s3c_irq_demux_uart(IRQ_S3CUART_RX1);
542 s3c_irq_demux_uart2(unsigned int irq,
543 struct irq_desc *desc)
546 s3c_irq_demux_uart(IRQ_S3CUART_RX2);
550 s3c_irq_demux_extint8(unsigned int irq,
551 struct irq_desc *desc)
553 unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
554 unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
557 eintpnd &= ~0xff; /* ignore lower irqs */
559 /* we may as well handle all the pending IRQs here */
562 irq = __ffs(eintpnd);
563 eintpnd &= ~(1<<irq);
565 irq += (IRQ_EINT4 - 4);
566 generic_handle_irq(irq);
572 s3c_irq_demux_extint4t7(unsigned int irq,
573 struct irq_desc *desc)
575 unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
576 unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
579 eintpnd &= 0xff; /* only lower irqs */
581 /* we may as well handle all the pending IRQs here */
584 irq = __ffs(eintpnd);
585 eintpnd &= ~(1<<irq);
587 irq += (IRQ_EINT4 - 4);
589 generic_handle_irq(irq);
595 static struct sleep_save irq_save[] = {
596 SAVE_ITEM(S3C2410_INTMSK),
597 SAVE_ITEM(S3C2410_INTSUBMSK),
600 /* the extint values move between the s3c2410/s3c2440 and the s3c2412
601 * so we use an array to hold them, and to calculate the address of
602 * the register at run-time
605 static unsigned long save_extint[3];
606 static unsigned long save_eintflt[4];
607 static unsigned long save_eintmask;
609 int s3c24xx_irq_suspend(struct sys_device *dev, pm_message_t state)
613 for (i = 0; i < ARRAY_SIZE(save_extint); i++)
614 save_extint[i] = __raw_readl(S3C24XX_EXTINT0 + (i*4));
616 for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
617 save_eintflt[i] = __raw_readl(S3C24XX_EINFLT0 + (i*4));
619 s3c2410_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
620 save_eintmask = __raw_readl(S3C24XX_EINTMASK);
625 int s3c24xx_irq_resume(struct sys_device *dev)
629 for (i = 0; i < ARRAY_SIZE(save_extint); i++)
630 __raw_writel(save_extint[i], S3C24XX_EXTINT0 + (i*4));
632 for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
633 __raw_writel(save_eintflt[i], S3C24XX_EINFLT0 + (i*4));
635 s3c2410_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
636 __raw_writel(save_eintmask, S3C24XX_EINTMASK);
642 #define s3c24xx_irq_suspend NULL
643 #define s3c24xx_irq_resume NULL
648 * Initialise S3C2410 IRQ system
651 void __init s3c24xx_init_irq(void)
658 irqdbf("s3c2410_init_irq: clearing interrupt status flags\n");
660 /* first, clear all interrupts pending... */
663 for (i = 0; i < 4; i++) {
664 pend = __raw_readl(S3C24XX_EINTPEND);
666 if (pend == 0 || pend == last)
669 __raw_writel(pend, S3C24XX_EINTPEND);
670 printk("irq: clearing pending ext status %08x\n", (int)pend);
675 for (i = 0; i < 4; i++) {
676 pend = __raw_readl(S3C2410_INTPND);
678 if (pend == 0 || pend == last)
681 __raw_writel(pend, S3C2410_SRCPND);
682 __raw_writel(pend, S3C2410_INTPND);
683 printk("irq: clearing pending status %08x\n", (int)pend);
688 for (i = 0; i < 4; i++) {
689 pend = __raw_readl(S3C2410_SUBSRCPND);
691 if (pend == 0 || pend == last)
694 printk("irq: clearing subpending status %08x\n", (int)pend);
695 __raw_writel(pend, S3C2410_SUBSRCPND);
699 /* register the main interrupts */
701 irqdbf("s3c2410_init_irq: registering s3c2410 interrupt handlers\n");
703 for (irqno = IRQ_EINT4t7; irqno <= IRQ_ADCPARENT; irqno++) {
704 /* set all the s3c2410 internal irqs */
707 /* deal with the special IRQs (cascaded) */
715 set_irq_chip(irqno, &s3c_irq_level_chip);
716 set_irq_handler(irqno, handle_level_irq);
725 //irqdbf("registering irq %d (s3c irq)\n", irqno);
726 set_irq_chip(irqno, &s3c_irq_chip);
727 set_irq_handler(irqno, handle_edge_irq);
728 set_irq_flags(irqno, IRQF_VALID);
732 /* setup the cascade irq handlers */
734 set_irq_chained_handler(IRQ_EINT4t7, s3c_irq_demux_extint4t7);
735 set_irq_chained_handler(IRQ_EINT8t23, s3c_irq_demux_extint8);
737 set_irq_chained_handler(IRQ_UART0, s3c_irq_demux_uart0);
738 set_irq_chained_handler(IRQ_UART1, s3c_irq_demux_uart1);
739 set_irq_chained_handler(IRQ_UART2, s3c_irq_demux_uart2);
740 set_irq_chained_handler(IRQ_ADCPARENT, s3c_irq_demux_adc);
742 /* external interrupts */
744 for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
745 irqdbf("registering irq %d (ext int)\n", irqno);
746 set_irq_chip(irqno, &s3c_irq_eint0t4);
747 set_irq_handler(irqno, handle_edge_irq);
748 set_irq_flags(irqno, IRQF_VALID);
751 for (irqno = IRQ_EINT4; irqno <= IRQ_EINT23; irqno++) {
752 irqdbf("registering irq %d (extended s3c irq)\n", irqno);
753 set_irq_chip(irqno, &s3c_irqext_chip);
754 set_irq_handler(irqno, handle_edge_irq);
755 set_irq_flags(irqno, IRQF_VALID);
758 /* register the uart interrupts */
760 irqdbf("s3c2410: registering external interrupts\n");
762 for (irqno = IRQ_S3CUART_RX0; irqno <= IRQ_S3CUART_ERR0; irqno++) {
763 irqdbf("registering irq %d (s3c uart0 irq)\n", irqno);
764 set_irq_chip(irqno, &s3c_irq_uart0);
765 set_irq_handler(irqno, handle_level_irq);
766 set_irq_flags(irqno, IRQF_VALID);
769 for (irqno = IRQ_S3CUART_RX1; irqno <= IRQ_S3CUART_ERR1; irqno++) {
770 irqdbf("registering irq %d (s3c uart1 irq)\n", irqno);
771 set_irq_chip(irqno, &s3c_irq_uart1);
772 set_irq_handler(irqno, handle_level_irq);
773 set_irq_flags(irqno, IRQF_VALID);
776 for (irqno = IRQ_S3CUART_RX2; irqno <= IRQ_S3CUART_ERR2; irqno++) {
777 irqdbf("registering irq %d (s3c uart2 irq)\n", irqno);
778 set_irq_chip(irqno, &s3c_irq_uart2);
779 set_irq_handler(irqno, handle_level_irq);
780 set_irq_flags(irqno, IRQF_VALID);
783 for (irqno = IRQ_TC; irqno <= IRQ_ADC; irqno++) {
784 irqdbf("registering irq %d (s3c adc irq)\n", irqno);
785 set_irq_chip(irqno, &s3c_irq_adc);
786 set_irq_handler(irqno, handle_edge_irq);
787 set_irq_flags(irqno, IRQF_VALID);
790 irqdbf("s3c2410: registered interrupt handlers\n");