97f6512aa1b7c565a1aa3e2bd04ba777b84ac5b6
[linux-2.6.git] / arch / sh / cchips / hd6446x / hd64461.c
1 /*
2  *      Copyright (C) 2000 YAEGASHI Takeshi
3  *      Hitachi HD64461 companion chip support
4  */
5
6 #include <linux/sched.h>
7 #include <linux/module.h>
8 #include <linux/kernel.h>
9 #include <linux/param.h>
10 #include <linux/interrupt.h>
11 #include <linux/init.h>
12 #include <linux/irq.h>
13 #include <asm/io.h>
14 #include <asm/irq.h>
15 #include <asm/hd64461.h>
16
17 static void disable_hd64461_irq(unsigned int irq)
18 {
19         unsigned short nimr;
20         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
21
22         nimr = inw(HD64461_NIMR);
23         nimr |= mask;
24         outw(nimr, HD64461_NIMR);
25 }
26
27 static void enable_hd64461_irq(unsigned int irq)
28 {
29         unsigned short nimr;
30         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
31
32         nimr = inw(HD64461_NIMR);
33         nimr &= ~mask;
34         outw(nimr, HD64461_NIMR);
35 }
36
37 static void mask_and_ack_hd64461(unsigned int irq)
38 {
39         disable_hd64461_irq(irq);
40 #ifdef CONFIG_HD64461_ENABLER
41         if (irq == HD64461_IRQBASE + 13)
42                 outb(0x00, HD64461_PCC1CSCR);
43 #endif
44 }
45
46 static void end_hd64461_irq(unsigned int irq)
47 {
48         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
49                 enable_hd64461_irq(irq);
50 }
51
52 static unsigned int startup_hd64461_irq(unsigned int irq)
53 {
54         enable_hd64461_irq(irq);
55         return 0;
56 }
57
58 static void shutdown_hd64461_irq(unsigned int irq)
59 {
60         disable_hd64461_irq(irq);
61 }
62
63 static struct hw_interrupt_type hd64461_irq_type = {
64         .typename       = "HD64461-IRQ",
65         .startup        = startup_hd64461_irq,
66         .shutdown       = shutdown_hd64461_irq,
67         .enable         = enable_hd64461_irq,
68         .disable        = disable_hd64461_irq,
69         .ack            = mask_and_ack_hd64461,
70         .end            = end_hd64461_irq,
71 };
72
73 static irqreturn_t hd64461_interrupt(int irq, void *dev_id)
74 {
75         printk(KERN_INFO
76                "HD64461: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
77                inw(HD64461_NIRR), inw(HD64461_NIMR));
78
79         return IRQ_NONE;
80 }
81
82 static struct {
83         int (*func) (int, void *);
84         void *dev;
85 } hd64461_demux[HD64461_IRQ_NUM];
86
87 void hd64461_register_irq_demux(int irq,
88                                 int (*demux) (int irq, void *dev), void *dev)
89 {
90         hd64461_demux[irq - HD64461_IRQBASE].func = demux;
91         hd64461_demux[irq - HD64461_IRQBASE].dev = dev;
92 }
93
94 EXPORT_SYMBOL(hd64461_register_irq_demux);
95
96 void hd64461_unregister_irq_demux(int irq)
97 {
98         hd64461_demux[irq - HD64461_IRQBASE].func = 0;
99 }
100
101 EXPORT_SYMBOL(hd64461_unregister_irq_demux);
102
103 int hd64461_irq_demux(int irq)
104 {
105         if (irq == CONFIG_HD64461_IRQ) {
106                 unsigned short bit;
107                 unsigned short nirr = inw(HD64461_NIRR);
108                 unsigned short nimr = inw(HD64461_NIMR);
109                 int i;
110
111                 nirr &= ~nimr;
112                 for (bit = 1, i = 0; i < 16; bit <<= 1, i++)
113                         if (nirr & bit)
114                                 break;
115                 if (i == 16)
116                         irq = CONFIG_HD64461_IRQ;
117                 else {
118                         irq = HD64461_IRQBASE + i;
119                         if (hd64461_demux[i].func != 0) {
120                                 irq = hd64461_demux[i].func(irq, hd64461_demux[i].dev);
121                         }
122                 }
123         }
124         return __irq_demux(irq);
125 }
126
127 static struct irqaction irq0 = { hd64461_interrupt, IRQF_DISABLED, CPU_MASK_NONE, "HD64461", NULL, NULL };
128
129 int __init setup_hd64461(void)
130 {
131         int i;
132
133         if (!MACH_HD64461)
134                 return 0;
135
136         printk(KERN_INFO
137                "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
138                CONFIG_HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE,
139                HD64461_IRQBASE + 15);
140
141 #if defined(CONFIG_CPU_SUBTYPE_SH7709)  /* Should be at processor specific part.. */
142         outw(0x2240, INTC_ICR1);
143 #endif
144         outw(0xffff, HD64461_NIMR);
145
146         for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) {
147                 irq_desc[i].chip = &hd64461_irq_type;
148         }
149
150         setup_irq(CONFIG_HD64461_IRQ, &irq0);
151
152 #ifdef CONFIG_HD64461_ENABLER
153         printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
154         outb(0x4c, HD64461_PCC1CSCIER);
155         outb(0x00, HD64461_PCC1CSCR);
156 #endif
157
158         return 0;
159 }
160
161 module_init(setup_hd64461);