1 /*
2 * linux/arch/sh/boards/se/7343/irq.c
3 *
4 * Copyright (C) 2008 Yoshihiro Shimoda
5 *
6 * Based on linux/arch/sh/boards/se/7722/irq.c
7 * Copyright (C) 2007 Nobuhiro Iwamatsu
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file "COPYING" in the main directory of this archive
11 * for more details.
12 */
13 #include <linux/init.h>
14 #include <linux/irq.h>
15 #include <linux/interrupt.h>
16 #include <linux/io.h>
17 #include <mach-se/mach/se7343.h>
18
19 unsigned int se7343_fpga_irq[SE7343_FPGA_IRQ_NR] = { 0, };
20
disable_se7343_irq(struct irq_data * data)21 static void disable_se7343_irq(struct irq_data *data)
22 {
23 unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data);
24 __raw_writew(__raw_readw(PA_CPLD_IMSK) | 1 << bit, PA_CPLD_IMSK);
25 }
26
enable_se7343_irq(struct irq_data * data)27 static void enable_se7343_irq(struct irq_data *data)
28 {
29 unsigned int bit = (unsigned int)irq_data_get_irq_chip_data(data);
30 __raw_writew(__raw_readw(PA_CPLD_IMSK) & ~(1 << bit), PA_CPLD_IMSK);
31 }
32
33 static struct irq_chip se7343_irq_chip __read_mostly = {
34 .name = "SE7343-FPGA",
35 .irq_mask = disable_se7343_irq,
36 .irq_unmask = enable_se7343_irq,
37 };
38
se7343_irq_demux(unsigned int irq,struct irq_desc * desc)39 static void se7343_irq_demux(unsigned int irq, struct irq_desc *desc)
40 {
41 unsigned short intv = __raw_readw(PA_CPLD_ST);
42 unsigned int ext_irq = 0;
43
44 intv &= (1 << SE7343_FPGA_IRQ_NR) - 1;
45
46 for (; intv; intv >>= 1, ext_irq++) {
47 if (!(intv & 1))
48 continue;
49
50 generic_handle_irq(se7343_fpga_irq[ext_irq]);
51 }
52 }
53
54 /*
55 * Initialize IRQ setting
56 */
init_7343se_IRQ(void)57 void __init init_7343se_IRQ(void)
58 {
59 int i, irq;
60
61 __raw_writew(0, PA_CPLD_IMSK); /* disable all irqs */
62 __raw_writew(0x2000, 0xb03fffec); /* mrshpc irq enable */
63
64 for (i = 0; i < SE7343_FPGA_IRQ_NR; i++) {
65 irq = create_irq();
66 if (irq < 0)
67 return;
68 se7343_fpga_irq[i] = irq;
69
70 irq_set_chip_and_handler_name(se7343_fpga_irq[i],
71 &se7343_irq_chip,
72 handle_level_irq,
73 "level");
74
75 irq_set_chip_data(se7343_fpga_irq[i], (void *)i);
76 }
77
78 irq_set_chained_handler(IRQ0_IRQ, se7343_irq_demux);
79 irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
80 irq_set_chained_handler(IRQ1_IRQ, se7343_irq_demux);
81 irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
82 irq_set_chained_handler(IRQ4_IRQ, se7343_irq_demux);
83 irq_set_irq_type(IRQ4_IRQ, IRQ_TYPE_LEVEL_LOW);
84 irq_set_chained_handler(IRQ5_IRQ, se7343_irq_demux);
85 irq_set_irq_type(IRQ5_IRQ, IRQ_TYPE_LEVEL_LOW);
86 }
87