sh: Add support for Solution Engine 7206 and 7619 boards.
[linux-2.6.git] / arch / sh / boards / se / 7206 / irq.c
1 /*
2  * linux/arch/sh/boards/se/7206/irq.c
3  *
4  * Copyright (C) 2005,2006 Yoshinori Sato
5  *
6  * Hitachi SolutionEngine Support.
7  *
8  */
9
10 #include <linux/config.h>
11 #include <linux/init.h>
12 #include <linux/irq.h>
13 #include <asm/irq.h>
14 #include <asm/io.h>
15 #include <asm/se7206.h>
16
17 #define INTSTS0 0x31800000
18 #define INTSTS1 0x31800002
19 #define INTMSK0 0x31800004
20 #define INTMSK1 0x31800006
21 #define INTSEL  0x31800008
22
23 /* shutdown is same as "disable" */
24 #define shutdown_se7206_irq disable_se7206_irq
25
26 static void disable_se7206_irq(unsigned int irq)
27 {
28         unsigned short val;
29         unsigned short mask = 0xffff ^ (0x0f << 4 * (3 - (IRQ0_IRQ - irq)));
30         unsigned short msk0,msk1;
31
32         /* Set the priority in IPR to 0 */
33         val = ctrl_inw(INTC_IPR01);
34         val &= mask;
35         ctrl_outw(val, INTC_IPR01);
36         /* FPGA mask set */
37         msk0 = ctrl_inw(INTMSK0);
38         msk1 = ctrl_inw(INTMSK1);
39
40         switch (irq) {
41         case IRQ0_IRQ:
42                 msk0 |= 0x0010;
43                 break;
44         case IRQ1_IRQ:
45                 msk0 |= 0x000f;
46                 break;
47         case IRQ2_IRQ:
48                 msk0 |= 0x0f00;
49                 msk1 |= 0x00ff;
50                 break;
51         }
52         ctrl_outw(msk0, INTMSK0);
53         ctrl_outw(msk1, INTMSK1);
54 }
55
56 static void enable_se7206_irq(unsigned int irq)
57 {
58         unsigned short val;
59         unsigned short value = (0x0001 << 4 * (3 - (IRQ0_IRQ - irq)));
60         unsigned short msk0,msk1;
61
62         /* Set priority in IPR back to original value */
63         val = ctrl_inw(INTC_IPR01);
64         val |= value;
65         ctrl_outw(val, INTC_IPR01);
66
67         /* FPGA mask reset */
68         msk0 = ctrl_inw(INTMSK0);
69         msk1 = ctrl_inw(INTMSK1);
70
71         switch (irq) {
72         case IRQ0_IRQ:
73                 msk0 &= ~0x0010;
74                 break;
75         case IRQ1_IRQ:
76                 msk0 &= ~0x000f;
77                 break;
78         case IRQ2_IRQ:
79                 msk0 &= ~0x0f00;
80                 msk1 &= ~0x00ff;
81                 break;
82         }
83         ctrl_outw(msk0, INTMSK0);
84         ctrl_outw(msk1, INTMSK1);
85 }
86
87 static unsigned int startup_se7206_irq(unsigned int irq)
88 {
89         enable_se7206_irq(irq);
90         return 0; /* never anything pending */
91 }
92
93 static void ack_se7206_irq(unsigned int irq)
94 {
95         disable_se7206_irq(irq);
96 }
97
98 static void end_se7206_irq(unsigned int irq)
99 {
100         unsigned short sts0,sts1;
101
102         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
103                 enable_se7206_irq(irq);
104         /* FPGA isr clear */
105         sts0 = ctrl_inw(INTSTS0);
106         sts1 = ctrl_inw(INTSTS1);
107
108         switch (irq) {
109         case IRQ0_IRQ:
110                 sts0 &= ~0x0010;
111                 break;
112         case IRQ1_IRQ:
113                 sts0 &= ~0x000f;
114                 break;
115         case IRQ2_IRQ:
116                 sts0 &= ~0x0f00;
117                 sts1 &= ~0x00ff;
118                 break;
119         }
120         ctrl_outw(sts0, INTSTS0);
121         ctrl_outw(sts1, INTSTS1);
122 }
123
124 static struct hw_interrupt_type se7206_irq_type = {
125         .typename =  "SE7206 FPGA-IRQ",
126         .startup = startup_se7206_irq,
127         .shutdown = shutdown_se7206_irq,
128         .enable = enable_se7206_irq,
129         .disable = disable_se7206_irq,
130         .ack = ack_se7206_irq,
131         .end = end_se7206_irq,
132 };
133
134 static void make_se7206_irq(unsigned int irq)
135 {
136         disable_irq_nosync(irq);
137         irq_desc[irq].handler = &se7206_irq_type;
138         disable_se7206_irq(irq);
139 }
140
141 /*
142  * Initialize IRQ setting
143  */
144 void __init init_se7206_IRQ(void)
145 {
146         make_se7206_irq(IRQ0_IRQ); /* SMC91C111 */
147         make_se7206_irq(IRQ1_IRQ); /* ATA */
148         make_se7206_irq(IRQ3_IRQ); /* SLOT / PCM */
149         ctrl_outw(inw(INTC_ICR1) | 0x000b ,INTC_ICR1 ) ; /* ICR1 */
150
151         /* FPGA System register setup*/
152         ctrl_outw(0x0000,INTSTS0); /* Clear INTSTS0 */
153         ctrl_outw(0x0000,INTSTS1); /* Clear INTSTS1 */
154         /* IRQ0=LAN, IRQ1=ATA, IRQ3=SLT,PCM */
155         ctrl_outw(0x0001,INTSEL);
156 }
157
158 int se7206_irq_demux(int irq)
159 {
160         return irq;
161 }