Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[linux-2.6] / arch / sh / kernel / cpu / irq / pint.c
1 /*
2  * arch/sh/kernel/cpu/irq/pint.c - Interrupt handling for PINT-based IRQs.
3  *
4  * Copyright (C) 1999  Niibe Yutaka & Takeshi Yaegashi
5  * Copyright (C) 2000  Kazumoto Kojima
6  * Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
7  *
8  * This file is subject to the terms and conditions of the GNU General Public
9  * License.  See the file "COPYING" in the main directory of this archive
10  * for more details.
11  */
12
13 #include <linux/config.h>
14 #include <linux/init.h>
15 #include <linux/irq.h>
16 #include <linux/module.h>
17
18 #include <asm/system.h>
19 #include <asm/io.h>
20 #include <asm/machvec.h>
21
22 static unsigned char pint_map[256];
23 static unsigned long portcr_mask;
24
25 static void enable_pint_irq(unsigned int irq);
26 static void disable_pint_irq(unsigned int irq);
27
28 /* shutdown is same as "disable" */
29 #define shutdown_pint_irq disable_pint_irq
30
31 static void mask_and_ack_pint(unsigned int);
32 static void end_pint_irq(unsigned int irq);
33
34 static unsigned int startup_pint_irq(unsigned int irq)
35 {
36         enable_pint_irq(irq);
37         return 0; /* never anything pending */
38 }
39
40 static struct hw_interrupt_type pint_irq_type = {
41         .typename = "PINT-IRQ",
42         .startup = startup_pint_irq,
43         .shutdown = shutdown_pint_irq,
44         .enable = enable_pint_irq,
45         .disable = disable_pint_irq,
46         .ack = mask_and_ack_pint,
47         .end = end_pint_irq
48 };
49
50 static void disable_pint_irq(unsigned int irq)
51 {
52         unsigned long val, flags;
53
54         local_irq_save(flags);
55         val = ctrl_inw(INTC_INTER);
56         val &= ~(1 << (irq - PINT_IRQ_BASE));
57         ctrl_outw(val, INTC_INTER);     /* disable PINTn */
58         portcr_mask &= ~(3 << (irq - PINT_IRQ_BASE)*2);
59         local_irq_restore(flags);
60 }
61
62 static void enable_pint_irq(unsigned int irq)
63 {
64         unsigned long val, flags;
65
66         local_irq_save(flags);
67         val = ctrl_inw(INTC_INTER);
68         val |= 1 << (irq - PINT_IRQ_BASE);
69         ctrl_outw(val, INTC_INTER);     /* enable PINTn */
70         portcr_mask |= 3 << (irq - PINT_IRQ_BASE)*2;
71         local_irq_restore(flags);
72 }
73
74 static void mask_and_ack_pint(unsigned int irq)
75 {
76         disable_pint_irq(irq);
77 }
78
79 static void end_pint_irq(unsigned int irq)
80 {
81         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
82                 enable_pint_irq(irq);
83 }
84
85 void make_pint_irq(unsigned int irq)
86 {
87         disable_irq_nosync(irq);
88         irq_desc[irq].handler = &pint_irq_type;
89         disable_pint_irq(irq);
90 }
91
92 void __init init_IRQ_pint(void)
93 {
94         int i;
95
96         make_ipr_irq(PINT0_IRQ, PINT0_IPR_ADDR, PINT0_IPR_POS, PINT0_PRIORITY);
97         make_ipr_irq(PINT8_IRQ, PINT8_IPR_ADDR, PINT8_IPR_POS, PINT8_PRIORITY);
98
99         enable_irq(PINT0_IRQ);
100         enable_irq(PINT8_IRQ);
101
102         for(i = 0; i < 16; i++)
103                 make_pint_irq(PINT_IRQ_BASE + i);
104
105         for(i = 0; i < 256; i++) {
106                 if (i & 1)
107                         pint_map[i] = 0;
108                 else if (i & 2)
109                         pint_map[i] = 1;
110                 else if (i & 4)
111                         pint_map[i] = 2;
112                 else if (i & 8)
113                         pint_map[i] = 3;
114                 else if (i & 0x10)
115                         pint_map[i] = 4;
116                 else if (i & 0x20)
117                         pint_map[i] = 5;
118                 else if (i & 0x40)
119                         pint_map[i] = 6;
120                 else if (i & 0x80)
121                         pint_map[i] = 7;
122         }
123 }
124
125 int ipr_irq_demux(int irq)
126 {
127         unsigned long creg, dreg, d, sav;
128
129         if (irq == PINT0_IRQ) {
130 #if defined(CONFIG_CPU_SUBTYPE_SH7707)
131                 creg = PORT_PACR;
132                 dreg = PORT_PADR;
133 #else
134                 creg = PORT_PCCR;
135                 dreg = PORT_PCDR;
136 #endif
137                 sav = ctrl_inw(creg);
138                 ctrl_outw(sav | portcr_mask, creg);
139                 d = (~ctrl_inb(dreg) ^ ctrl_inw(INTC_ICR2)) &
140                         ctrl_inw(INTC_INTER) & 0xff;
141                 ctrl_outw(sav, creg);
142
143                 if (d == 0)
144                         return irq;
145
146                 return PINT_IRQ_BASE + pint_map[d];
147         } else if (irq == PINT8_IRQ) {
148 #if defined(CONFIG_CPU_SUBTYPE_SH7707)
149                 creg = PORT_PBCR;
150                 dreg = PORT_PBDR;
151 #else
152                 creg = PORT_PFCR;
153                 dreg = PORT_PFDR;
154 #endif
155                 sav = ctrl_inw(creg);
156                 ctrl_outw(sav | (portcr_mask >> 16), creg);
157                 d = (~ctrl_inb(dreg) ^ (ctrl_inw(INTC_ICR2) >> 8)) &
158                         (ctrl_inw(INTC_INTER) >> 8) & 0xff;
159                 ctrl_outw(sav, creg);
160
161                 if (d == 0)
162                         return irq;
163
164                 return PINT_IRQ_BASE + 8 + pint_map[d];
165         }
166
167         return irq;
168 }
169