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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 
s3c2416_irq_demux(unsigned int irq,unsigned int len)45 static 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 
s3c2416_irq_demux_wdtac97(unsigned int irq,struct irq_desc * desc)72 static 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 
s3c2416_irq_wdtac97_mask(struct irq_data * data)80 static void s3c2416_irq_wdtac97_mask(struct irq_data *data)
81 {
82 	s3c_irqsub_mask(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
83 }
84 
s3c2416_irq_wdtac97_unmask(struct irq_data * data)85 static void s3c2416_irq_wdtac97_unmask(struct irq_data *data)
86 {
87 	s3c_irqsub_unmask(data->irq, INTMSK_WDTAC97);
88 }
89 
s3c2416_irq_wdtac97_ack(struct irq_data * data)90 static void s3c2416_irq_wdtac97_ack(struct irq_data *data)
91 {
92 	s3c_irqsub_maskack(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
93 }
94 
95 static 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 
s3c2416_irq_demux_lcd(unsigned int irq,struct irq_desc * desc)103 static 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 
s3c2416_irq_lcd_mask(struct irq_data * data)111 static void s3c2416_irq_lcd_mask(struct irq_data *data)
112 {
113 	s3c_irqsub_mask(data->irq, INTMSK_LCD, SUBMSK_LCD);
114 }
115 
s3c2416_irq_lcd_unmask(struct irq_data * data)116 static void s3c2416_irq_lcd_unmask(struct irq_data *data)
117 {
118 	s3c_irqsub_unmask(data->irq, INTMSK_LCD);
119 }
120 
s3c2416_irq_lcd_ack(struct irq_data * data)121 static void s3c2416_irq_lcd_ack(struct irq_data *data)
122 {
123 	s3c_irqsub_maskack(data->irq, INTMSK_LCD, SUBMSK_LCD);
124 }
125 
126 static 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 
s3c2416_irq_demux_dma(unsigned int irq,struct irq_desc * desc)134 static 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 
s3c2416_irq_dma_mask(struct irq_data * data)143 static void s3c2416_irq_dma_mask(struct irq_data *data)
144 {
145 	s3c_irqsub_mask(data->irq, INTMSK_DMA, SUBMSK_DMA);
146 }
147 
s3c2416_irq_dma_unmask(struct irq_data * data)148 static void s3c2416_irq_dma_unmask(struct irq_data *data)
149 {
150 	s3c_irqsub_unmask(data->irq, INTMSK_DMA);
151 }
152 
s3c2416_irq_dma_ack(struct irq_data * data)153 static void s3c2416_irq_dma_ack(struct irq_data *data)
154 {
155 	s3c_irqsub_maskack(data->irq, INTMSK_DMA, SUBMSK_DMA);
156 }
157 
158 static 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 
s3c2416_irq_demux_uart3(unsigned int irq,struct irq_desc * desc)166 static 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 
s3c2416_irq_uart3_mask(struct irq_data * data)174 static void s3c2416_irq_uart3_mask(struct irq_data *data)
175 {
176 	s3c_irqsub_mask(data->irq, INTMSK_UART3, SUBMSK_UART3);
177 }
178 
s3c2416_irq_uart3_unmask(struct irq_data * data)179 static void s3c2416_irq_uart3_unmask(struct irq_data *data)
180 {
181 	s3c_irqsub_unmask(data->irq, INTMSK_UART3);
182 }
183 
s3c2416_irq_uart3_ack(struct irq_data * data)184 static void s3c2416_irq_uart3_ack(struct irq_data *data)
185 {
186 	s3c_irqsub_maskack(data->irq, INTMSK_UART3, SUBMSK_UART3);
187 }
188 
189 static 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 
s3c2416_add_sub(unsigned int base,void (* demux)(unsigned int,struct irq_desc *),struct irq_chip * chip,unsigned int start,unsigned int end)197 static 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 
s3c2416_irq_add(struct device * dev,struct subsys_interface * sif)216 static 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 
238 static struct subsys_interface s3c2416_irq_interface = {
239 	.name		= "s3c2416_irq",
240 	.subsys		= &s3c2416_subsys,
241 	.add_dev	= s3c2416_irq_add,
242 };
243 
s3c2416_irq_init(void)244 static int __init s3c2416_irq_init(void)
245 {
246 	return subsys_interface_register(&s3c2416_irq_interface);
247 }
248 
249 arch_initcall(s3c2416_irq_init);
250 
251