1 /* linux/arch/arm/mach-s3c2410/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 seperate file
53 #include <linux/init.h>
54 #include <linux/module.h>
55 #include <linux/interrupt.h>
56 #include <linux/ioport.h>
57 #include <linux/ptrace.h>
58 #include <linux/sysdev.h>
60 #include <asm/hardware.h>
64 #include <asm/mach/irq.h>
66 #include <asm/arch/regs-irq.h>
67 #include <asm/arch/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 irqchip s3c_irq_level_chip = {
184 .ack = s3c_irq_maskack,
185 .mask = s3c_irq_mask,
186 .unmask = s3c_irq_unmask,
187 .set_wake = s3c_irq_wake
190 static struct irqchip s3c_irq_chip = {
192 .mask = s3c_irq_mask,
193 .unmask = s3c_irq_unmask,
194 .set_wake = s3c_irq_wake
202 s3c_irqext_mask(unsigned int irqno)
208 mask = __raw_readl(S3C2410_EINTMASK);
209 mask |= ( 1UL << irqno);
210 __raw_writel(mask, S3C2410_EINTMASK);
212 if (irqno <= (IRQ_EINT7 - EXTINT_OFF)) {
213 /* check to see if all need masking */
215 if ((mask & (0xf << 4)) == (0xf << 4)) {
216 /* all masked, mask the parent */
217 s3c_irq_mask(IRQ_EINT4t7);
220 /* todo: the same check as above for the rest of the irq regs...*/
226 s3c_irqext_ack(unsigned int irqno)
232 bit = 1UL << (irqno - EXTINT_OFF);
235 mask = __raw_readl(S3C2410_EINTMASK);
237 __raw_writel(bit, S3C2410_EINTPEND);
239 req = __raw_readl(S3C2410_EINTPEND);
242 /* not sure if we should be acking the parent irq... */
244 if (irqno <= IRQ_EINT7 ) {
245 if ((req & 0xf0) == 0)
246 s3c_irq_ack(IRQ_EINT4t7);
249 s3c_irq_ack(IRQ_EINT8t23);
254 s3c_irqext_unmask(unsigned int irqno)
260 mask = __raw_readl(S3C2410_EINTMASK);
261 mask &= ~( 1UL << irqno);
262 __raw_writel(mask, S3C2410_EINTMASK);
264 s3c_irq_unmask((irqno <= (IRQ_EINT7 - EXTINT_OFF)) ? IRQ_EINT4t7 : IRQ_EINT8t23);
268 s3c_irqext_type(unsigned int irq, unsigned int type)
270 void __iomem *extint_reg;
271 void __iomem *gpcon_reg;
272 unsigned long gpcon_offset, extint_offset;
273 unsigned long newvalue = 0, value;
275 if ((irq >= IRQ_EINT0) && (irq <= IRQ_EINT3))
277 gpcon_reg = S3C2410_GPFCON;
278 extint_reg = S3C2410_EXTINT0;
279 gpcon_offset = (irq - IRQ_EINT0) * 2;
280 extint_offset = (irq - IRQ_EINT0) * 4;
282 else if ((irq >= IRQ_EINT4) && (irq <= IRQ_EINT7))
284 gpcon_reg = S3C2410_GPFCON;
285 extint_reg = S3C2410_EXTINT0;
286 gpcon_offset = (irq - (EXTINT_OFF)) * 2;
287 extint_offset = (irq - (EXTINT_OFF)) * 4;
289 else if ((irq >= IRQ_EINT8) && (irq <= IRQ_EINT15))
291 gpcon_reg = S3C2410_GPGCON;
292 extint_reg = S3C2410_EXTINT1;
293 gpcon_offset = (irq - IRQ_EINT8) * 2;
294 extint_offset = (irq - IRQ_EINT8) * 4;
296 else if ((irq >= IRQ_EINT16) && (irq <= IRQ_EINT23))
298 gpcon_reg = S3C2410_GPGCON;
299 extint_reg = S3C2410_EXTINT2;
300 gpcon_offset = (irq - IRQ_EINT8) * 2;
301 extint_offset = (irq - IRQ_EINT16) * 4;
305 /* Set the GPIO to external interrupt mode */
306 value = __raw_readl(gpcon_reg);
307 value = (value & ~(3 << gpcon_offset)) | (0x02 << gpcon_offset);
308 __raw_writel(value, gpcon_reg);
310 /* Set the external interrupt to pointed trigger type */
314 printk(KERN_WARNING "No edge setting!\n");
318 newvalue = S3C2410_EXTINT_RISEEDGE;
322 newvalue = S3C2410_EXTINT_FALLEDGE;
326 newvalue = S3C2410_EXTINT_BOTHEDGE;
330 newvalue = S3C2410_EXTINT_LOWLEV;
334 newvalue = S3C2410_EXTINT_HILEV;
338 printk(KERN_ERR "No such irq type %d", type);
342 value = __raw_readl(extint_reg);
343 value = (value & ~(7 << extint_offset)) | (newvalue << extint_offset);
344 __raw_writel(value, extint_reg);
349 static struct irqchip s3c_irqext_chip = {
350 .mask = s3c_irqext_mask,
351 .unmask = s3c_irqext_unmask,
352 .ack = s3c_irqext_ack,
353 .set_type = s3c_irqext_type,
354 .set_wake = s3c_irqext_wake
357 static struct irqchip s3c_irq_eint0t4 = {
359 .mask = s3c_irq_mask,
360 .unmask = s3c_irq_unmask,
361 .set_wake = s3c_irq_wake,
362 .set_type = s3c_irqext_type,
365 /* mask values for the parent registers for each of the interrupt types */
367 #define INTMSK_UART0 (1UL << (IRQ_UART0 - IRQ_EINT0))
368 #define INTMSK_UART1 (1UL << (IRQ_UART1 - IRQ_EINT0))
369 #define INTMSK_UART2 (1UL << (IRQ_UART2 - IRQ_EINT0))
370 #define INTMSK_ADCPARENT (1UL << (IRQ_ADCPARENT - IRQ_EINT0))
376 s3c_irq_uart0_mask(unsigned int irqno)
378 s3c_irqsub_mask(irqno, INTMSK_UART0, 7);
382 s3c_irq_uart0_unmask(unsigned int irqno)
384 s3c_irqsub_unmask(irqno, INTMSK_UART0);
388 s3c_irq_uart0_ack(unsigned int irqno)
390 s3c_irqsub_maskack(irqno, INTMSK_UART0, 7);
393 static struct irqchip s3c_irq_uart0 = {
394 .mask = s3c_irq_uart0_mask,
395 .unmask = s3c_irq_uart0_unmask,
396 .ack = s3c_irq_uart0_ack,
402 s3c_irq_uart1_mask(unsigned int irqno)
404 s3c_irqsub_mask(irqno, INTMSK_UART1, 7 << 3);
408 s3c_irq_uart1_unmask(unsigned int irqno)
410 s3c_irqsub_unmask(irqno, INTMSK_UART1);
414 s3c_irq_uart1_ack(unsigned int irqno)
416 s3c_irqsub_maskack(irqno, INTMSK_UART1, 7 << 3);
419 static struct irqchip s3c_irq_uart1 = {
420 .mask = s3c_irq_uart1_mask,
421 .unmask = s3c_irq_uart1_unmask,
422 .ack = s3c_irq_uart1_ack,
428 s3c_irq_uart2_mask(unsigned int irqno)
430 s3c_irqsub_mask(irqno, INTMSK_UART2, 7 << 6);
434 s3c_irq_uart2_unmask(unsigned int irqno)
436 s3c_irqsub_unmask(irqno, INTMSK_UART2);
440 s3c_irq_uart2_ack(unsigned int irqno)
442 s3c_irqsub_maskack(irqno, INTMSK_UART2, 7 << 6);
445 static struct irqchip s3c_irq_uart2 = {
446 .mask = s3c_irq_uart2_mask,
447 .unmask = s3c_irq_uart2_unmask,
448 .ack = s3c_irq_uart2_ack,
451 /* ADC and Touchscreen */
454 s3c_irq_adc_mask(unsigned int irqno)
456 s3c_irqsub_mask(irqno, INTMSK_ADCPARENT, 3 << 9);
460 s3c_irq_adc_unmask(unsigned int irqno)
462 s3c_irqsub_unmask(irqno, INTMSK_ADCPARENT);
466 s3c_irq_adc_ack(unsigned int irqno)
468 s3c_irqsub_ack(irqno, INTMSK_ADCPARENT, 3 << 9);
471 static struct irqchip s3c_irq_adc = {
472 .mask = s3c_irq_adc_mask,
473 .unmask = s3c_irq_adc_unmask,
474 .ack = s3c_irq_adc_ack,
477 /* irq demux for adc */
478 static void s3c_irq_demux_adc(unsigned int irq,
479 struct irqdesc *desc,
480 struct pt_regs *regs)
482 unsigned int subsrc, submsk;
483 unsigned int offset = 9;
484 struct irqdesc *mydesc;
486 /* read the current pending interrupts, and the mask
487 * for what it is available */
489 subsrc = __raw_readl(S3C2410_SUBSRCPND);
490 submsk = __raw_readl(S3C2410_INTSUBMSK);
498 mydesc = irq_desc + IRQ_TC;
499 desc_handle_irq(IRQ_TC, mydesc, regs);
502 mydesc = irq_desc + IRQ_ADC;
503 desc_handle_irq(IRQ_ADC, mydesc, regs);
508 static void s3c_irq_demux_uart(unsigned int start,
509 struct pt_regs *regs)
511 unsigned int subsrc, submsk;
512 unsigned int offset = start - IRQ_S3CUART_RX0;
513 struct irqdesc *desc;
515 /* read the current pending interrupts, and the mask
516 * for what it is available */
518 subsrc = __raw_readl(S3C2410_SUBSRCPND);
519 submsk = __raw_readl(S3C2410_INTSUBMSK);
521 irqdbf2("s3c_irq_demux_uart: start=%d (%d), subsrc=0x%08x,0x%08x\n",
522 start, offset, subsrc, submsk);
529 desc = irq_desc + start;
532 desc_handle_irq(start, desc, regs);
537 desc_handle_irq(start+1, desc, regs);
542 desc_handle_irq(start+2, desc, regs);
546 /* uart demux entry points */
549 s3c_irq_demux_uart0(unsigned int irq,
550 struct irqdesc *desc,
551 struct pt_regs *regs)
554 s3c_irq_demux_uart(IRQ_S3CUART_RX0, regs);
558 s3c_irq_demux_uart1(unsigned int irq,
559 struct irqdesc *desc,
560 struct pt_regs *regs)
563 s3c_irq_demux_uart(IRQ_S3CUART_RX1, regs);
567 s3c_irq_demux_uart2(unsigned int irq,
568 struct irqdesc *desc,
569 struct pt_regs *regs)
572 s3c_irq_demux_uart(IRQ_S3CUART_RX2, regs);
578 * Initialise S3C2410 IRQ system
581 void __init s3c24xx_init_irq(void)
588 irqdbf("s3c2410_init_irq: clearing interrupt status flags\n");
590 /* first, clear all interrupts pending... */
593 for (i = 0; i < 4; i++) {
594 pend = __raw_readl(S3C2410_EINTPEND);
596 if (pend == 0 || pend == last)
599 __raw_writel(pend, S3C2410_EINTPEND);
600 printk("irq: clearing pending ext status %08x\n", (int)pend);
605 for (i = 0; i < 4; i++) {
606 pend = __raw_readl(S3C2410_INTPND);
608 if (pend == 0 || pend == last)
611 __raw_writel(pend, S3C2410_SRCPND);
612 __raw_writel(pend, S3C2410_INTPND);
613 printk("irq: clearing pending status %08x\n", (int)pend);
618 for (i = 0; i < 4; i++) {
619 pend = __raw_readl(S3C2410_SUBSRCPND);
621 if (pend == 0 || pend == last)
624 printk("irq: clearing subpending status %08x\n", (int)pend);
625 __raw_writel(pend, S3C2410_SUBSRCPND);
629 /* register the main interrupts */
631 irqdbf("s3c2410_init_irq: registering s3c2410 interrupt handlers\n");
633 for (irqno = IRQ_BATT_FLT; irqno <= IRQ_ADCPARENT; irqno++) {
634 /* set all the s3c2410 internal irqs */
637 /* deal with the special IRQs (cascaded) */
643 set_irq_chip(irqno, &s3c_irq_level_chip);
644 set_irq_handler(irqno, do_level_IRQ);
653 //irqdbf("registering irq %d (s3c irq)\n", irqno);
654 set_irq_chip(irqno, &s3c_irq_chip);
655 set_irq_handler(irqno, do_edge_IRQ);
656 set_irq_flags(irqno, IRQF_VALID);
660 /* setup the cascade irq handlers */
662 set_irq_chained_handler(IRQ_UART0, s3c_irq_demux_uart0);
663 set_irq_chained_handler(IRQ_UART1, s3c_irq_demux_uart1);
664 set_irq_chained_handler(IRQ_UART2, s3c_irq_demux_uart2);
665 set_irq_chained_handler(IRQ_ADCPARENT, s3c_irq_demux_adc);
668 /* external interrupts */
670 for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
671 irqdbf("registering irq %d (ext int)\n", irqno);
672 set_irq_chip(irqno, &s3c_irq_eint0t4);
673 set_irq_handler(irqno, do_edge_IRQ);
674 set_irq_flags(irqno, IRQF_VALID);
677 for (irqno = IRQ_EINT4; irqno <= IRQ_EINT23; irqno++) {
678 irqdbf("registering irq %d (extended s3c irq)\n", irqno);
679 set_irq_chip(irqno, &s3c_irqext_chip);
680 set_irq_handler(irqno, do_edge_IRQ);
681 set_irq_flags(irqno, IRQF_VALID);
684 /* register the uart interrupts */
686 irqdbf("s3c2410: registering external interrupts\n");
688 for (irqno = IRQ_S3CUART_RX0; irqno <= IRQ_S3CUART_ERR0; irqno++) {
689 irqdbf("registering irq %d (s3c uart0 irq)\n", irqno);
690 set_irq_chip(irqno, &s3c_irq_uart0);
691 set_irq_handler(irqno, do_level_IRQ);
692 set_irq_flags(irqno, IRQF_VALID);
695 for (irqno = IRQ_S3CUART_RX1; irqno <= IRQ_S3CUART_ERR1; irqno++) {
696 irqdbf("registering irq %d (s3c uart1 irq)\n", irqno);
697 set_irq_chip(irqno, &s3c_irq_uart1);
698 set_irq_handler(irqno, do_level_IRQ);
699 set_irq_flags(irqno, IRQF_VALID);
702 for (irqno = IRQ_S3CUART_RX2; irqno <= IRQ_S3CUART_ERR2; irqno++) {
703 irqdbf("registering irq %d (s3c uart2 irq)\n", irqno);
704 set_irq_chip(irqno, &s3c_irq_uart2);
705 set_irq_handler(irqno, do_level_IRQ);
706 set_irq_flags(irqno, IRQF_VALID);
709 for (irqno = IRQ_TC; irqno <= IRQ_ADC; irqno++) {
710 irqdbf("registering irq %d (s3c adc irq)\n", irqno);
711 set_irq_chip(irqno, &s3c_irq_adc);
712 set_irq_handler(irqno, do_edge_IRQ);
713 set_irq_flags(irqno, IRQF_VALID);
716 irqdbf("s3c2410: registered interrupt handlers\n");