1/* linux/arch/arm/mach-s3c2416/irq.c
2 *
3 * Copyright (c) 2009 Yauhen Kharuzhy <jekhor@gmail.com>,
4 *	as part of OpenInkpot project
5 * Copyright (c) 2009 Promwad Innovation Company
6 *	Yauhen Kharuzhy <yauhen.kharuzhy@promwad.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21 *
22*/
23
24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/interrupt.h>
27#include <linux/ioport.h>
28#include <linux/device.h>
29#include <linux/io.h>
30
31#include <mach/hardware.h>
32#include <asm/irq.h>
33
34#include <asm/mach/irq.h>
35
36#include <mach/regs-irq.h>
37#include <mach/regs-gpio.h>
38
39#include <plat/cpu.h>
40#include <plat/pm.h>
41#include <plat/irq.h>
42
43#define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1)
44
45static inline void s3c2416_irq_demux(unsigned int irq, unsigned int len)
46{
47	unsigned int subsrc, submsk;
48	unsigned int end;
49
50	/* read the current pending interrupts, and the mask
51	 * for what it is available */
52
53	subsrc = __raw_readl(S3C2410_SUBSRCPND);
54	submsk = __raw_readl(S3C2410_INTSUBMSK);
55
56	subsrc  &= ~submsk;
57	subsrc >>= (irq - S3C2410_IRQSUB(0));
58	subsrc  &= (1 << len)-1;
59
60	end = len + irq;
61
62	for (; irq < end && subsrc; irq++) {
63		if (subsrc & 1)
64			generic_handle_irq(irq);
65
66		subsrc >>= 1;
67	}
68}
69
70/* WDT/AC97 sub interrupts */
71
72static void s3c2416_irq_demux_wdtac97(unsigned int irq, struct irq_desc *desc)
73{
74	s3c2416_irq_demux(IRQ_S3C2443_WDT, 4);
75}
76
77#define INTMSK_WDTAC97	(1UL << (IRQ_WDT - IRQ_EINT0))
78#define SUBMSK_WDTAC97	INTMSK(IRQ_S3C2443_WDT, IRQ_S3C2443_AC97)
79
80static void s3c2416_irq_wdtac97_mask(struct irq_data *data)
81{
82	s3c_irqsub_mask(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
83}
84
85static void s3c2416_irq_wdtac97_unmask(struct irq_data *data)
86{
87	s3c_irqsub_unmask(data->irq, INTMSK_WDTAC97);
88}
89
90static void s3c2416_irq_wdtac97_ack(struct irq_data *data)
91{
92	s3c_irqsub_maskack(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
93}
94
95static struct irq_chip s3c2416_irq_wdtac97 = {
96	.irq_mask	= s3c2416_irq_wdtac97_mask,
97	.irq_unmask	= s3c2416_irq_wdtac97_unmask,
98	.irq_ack	= s3c2416_irq_wdtac97_ack,
99};
100
101/* LCD sub interrupts */
102
103static void s3c2416_irq_demux_lcd(unsigned int irq, struct irq_desc *desc)
104{
105	s3c2416_irq_demux(IRQ_S3C2443_LCD1, 4);
106}
107
108#define INTMSK_LCD	(1UL << (IRQ_LCD - IRQ_EINT0))
109#define SUBMSK_LCD	INTMSK(IRQ_S3C2443_LCD1, IRQ_S3C2443_LCD4)
110
111static void s3c2416_irq_lcd_mask(struct irq_data *data)
112{
113	s3c_irqsub_mask(data->irq, INTMSK_LCD, SUBMSK_LCD);
114}
115
116static void s3c2416_irq_lcd_unmask(struct irq_data *data)
117{
118	s3c_irqsub_unmask(data->irq, INTMSK_LCD);
119}
120
121static void s3c2416_irq_lcd_ack(struct irq_data *data)
122{
123	s3c_irqsub_maskack(data->irq, INTMSK_LCD, SUBMSK_LCD);
124}
125
126static struct irq_chip s3c2416_irq_lcd = {
127	.irq_mask	= s3c2416_irq_lcd_mask,
128	.irq_unmask	= s3c2416_irq_lcd_unmask,
129	.irq_ack	= s3c2416_irq_lcd_ack,
130};
131
132/* DMA sub interrupts */
133
134static void s3c2416_irq_demux_dma(unsigned int irq, struct irq_desc *desc)
135{
136	s3c2416_irq_demux(IRQ_S3C2443_DMA0, 6);
137}
138
139#define INTMSK_DMA	(1UL << (IRQ_S3C2443_DMA - IRQ_EINT0))
140#define SUBMSK_DMA	INTMSK(IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5)
141
142
143static void s3c2416_irq_dma_mask(struct irq_data *data)
144{
145	s3c_irqsub_mask(data->irq, INTMSK_DMA, SUBMSK_DMA);
146}
147
148static void s3c2416_irq_dma_unmask(struct irq_data *data)
149{
150	s3c_irqsub_unmask(data->irq, INTMSK_DMA);
151}
152
153static void s3c2416_irq_dma_ack(struct irq_data *data)
154{
155	s3c_irqsub_maskack(data->irq, INTMSK_DMA, SUBMSK_DMA);
156}
157
158static struct irq_chip s3c2416_irq_dma = {
159	.irq_mask	= s3c2416_irq_dma_mask,
160	.irq_unmask	= s3c2416_irq_dma_unmask,
161	.irq_ack	= s3c2416_irq_dma_ack,
162};
163
164/* UART3 sub interrupts */
165
166static void s3c2416_irq_demux_uart3(unsigned int irq, struct irq_desc *desc)
167{
168	s3c2416_irq_demux(IRQ_S3C2443_RX3, 3);
169}
170
171#define INTMSK_UART3	(1UL << (IRQ_S3C2443_UART3 - IRQ_EINT0))
172#define SUBMSK_UART3	(0x7 << (IRQ_S3C2443_RX3 - S3C2410_IRQSUB(0)))
173
174static void s3c2416_irq_uart3_mask(struct irq_data *data)
175{
176	s3c_irqsub_mask(data->irq, INTMSK_UART3, SUBMSK_UART3);
177}
178
179static void s3c2416_irq_uart3_unmask(struct irq_data *data)
180{
181	s3c_irqsub_unmask(data->irq, INTMSK_UART3);
182}
183
184static void s3c2416_irq_uart3_ack(struct irq_data *data)
185{
186	s3c_irqsub_maskack(data->irq, INTMSK_UART3, SUBMSK_UART3);
187}
188
189static struct irq_chip s3c2416_irq_uart3 = {
190	.irq_mask	= s3c2416_irq_uart3_mask,
191	.irq_unmask	= s3c2416_irq_uart3_unmask,
192	.irq_ack	= s3c2416_irq_uart3_ack,
193};
194
195/* IRQ initialisation code */
196
197static int __init s3c2416_add_sub(unsigned int base,
198				   void (*demux)(unsigned int,
199						 struct irq_desc *),
200				   struct irq_chip *chip,
201				   unsigned int start, unsigned int end)
202{
203	unsigned int irqno;
204
205	irq_set_chip_and_handler(base, &s3c_irq_level_chip, handle_level_irq);
206	irq_set_chained_handler(base, demux);
207
208	for (irqno = start; irqno <= end; irqno++) {
209		irq_set_chip_and_handler(irqno, chip, handle_level_irq);
210		set_irq_flags(irqno, IRQF_VALID);
211	}
212
213	return 0;
214}
215
216static int __init s3c2416_irq_add(struct device *dev,
217				  struct subsys_interface *sif)
218{
219	printk(KERN_INFO "S3C2416: IRQ Support\n");
220
221	s3c2416_add_sub(IRQ_LCD, s3c2416_irq_demux_lcd, &s3c2416_irq_lcd,
222			IRQ_S3C2443_LCD2, IRQ_S3C2443_LCD4);
223
224	s3c2416_add_sub(IRQ_S3C2443_DMA, s3c2416_irq_demux_dma,
225			&s3c2416_irq_dma, IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5);
226
227	s3c2416_add_sub(IRQ_S3C2443_UART3, s3c2416_irq_demux_uart3,
228			&s3c2416_irq_uart3,
229			IRQ_S3C2443_RX3, IRQ_S3C2443_ERR3);
230
231	s3c2416_add_sub(IRQ_WDT, s3c2416_irq_demux_wdtac97,
232			&s3c2416_irq_wdtac97,
233			IRQ_S3C2443_WDT, IRQ_S3C2443_AC97);
234
235	return 0;
236}
237
238static struct subsys_interface s3c2416_irq_interface = {
239	.name		= "s3c2416_irq",
240	.subsys		= &s3c2416_subsys,
241	.add_dev	= s3c2416_irq_add,
242};
243
244static int __init s3c2416_irq_init(void)
245{
246	return subsys_interface_register(&s3c2416_irq_interface);
247}
248
249arch_initcall(s3c2416_irq_init);
250
251