1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/*
* intc-simr.c
*
* Interrupt controller code for the ColdFire 5208, 5207 & 532x parts.
*
* (C) Copyright 2009-2011, Greg Ungerer <gerg@snapgear.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/traps.h>
/*
* The EDGE Port interrupts are the fixed 7 external interrupts.
* They need some special treatment, for example they need to be acked.
*/
#ifdef CONFIG_M520x
/*
* The 520x parts only support a limited range of these external
* interrupts, only 1, 4 and 7 (as interrupts 65, 66 and 67).
*/
#define EINT0 64 /* Is not actually used, but spot reserved for it */
#define EINT1 65 /* EDGE Port interrupt 1 */
#define EINT4 66 /* EDGE Port interrupt 4 */
#define EINT7 67 /* EDGE Port interrupt 7 */
static unsigned int irqebitmap[] = { 0, 1, 4, 7 };
static unsigned int inline irq2ebit(unsigned int irq)
{
return irqebitmap[irq - EINT0];
}
#else
/*
* Most of the ColdFire parts with the EDGE Port module just have
* a strait direct mapping of the 7 external interrupts. Although
* there is a bit reserved for 0, it is not used.
*/
#define EINT0 64 /* Is not actually used, but spot reserved for it */
#define EINT1 65 /* EDGE Port interrupt 1 */
#define EINT7 71 /* EDGE Port interrupt 7 */
static unsigned int inline irq2ebit(unsigned int irq)
{
return irq - EINT0;
}
#endif
/*
* There maybe one, two or three interrupt control units, each has 64
* interrupts. If there is no second or third unit then MCFINTC1_* or
* MCFINTC2_* defines will be 0 (and code for them optimized away).
*/
static void intc_irq_mask(struct irq_data *d)
{
unsigned int irq = d->irq - MCFINT_VECBASE;
if (MCFINTC2_SIMR && (irq > 128))
__raw_writeb(irq - 128, MCFINTC2_SIMR);
else if (MCFINTC1_SIMR && (irq > 64))
__raw_writeb(irq - 64, MCFINTC1_SIMR);
else
__raw_writeb(irq, MCFINTC0_SIMR);
}
static void intc_irq_unmask(struct irq_data *d)
{
unsigned int irq = d->irq - MCFINT_VECBASE;
if (MCFINTC2_CIMR && (irq > 128))
__raw_writeb(irq - 128, MCFINTC2_CIMR);
else if (MCFINTC1_CIMR && (irq > 64))
__raw_writeb(irq - 64, MCFINTC1_CIMR);
else
__raw_writeb(irq, MCFINTC0_CIMR);
}
static void intc_irq_ack(struct irq_data *d)
{
unsigned int ebit = irq2ebit(d->irq);
__raw_writeb(0x1 << ebit, MCFEPORT_EPFR);
}
static unsigned int intc_irq_startup(struct irq_data *d)
{
unsigned int irq = d->irq;
if ((irq >= EINT1) && (irq <= EINT7)) {
unsigned int ebit = irq2ebit(irq);
u8 v;
#if defined(MCFEPORT_EPDDR)
/* Set EPORT line as input */
v = __raw_readb(MCFEPORT_EPDDR);
__raw_writeb(v & ~(0x1 << ebit), MCFEPORT_EPDDR);
#endif
/* Set EPORT line as interrupt source */
v = __raw_readb(MCFEPORT_EPIER);
__raw_writeb(v | (0x1 << ebit), MCFEPORT_EPIER);
}
irq -= MCFINT_VECBASE;
if (MCFINTC2_ICR0 && (irq > 128))
__raw_writeb(5, MCFINTC2_ICR0 + irq - 128);
else if (MCFINTC1_ICR0 && (irq > 64))
__raw_writeb(5, MCFINTC1_ICR0 + irq - 64);
else
__raw_writeb(5, MCFINTC0_ICR0 + irq);
intc_irq_unmask(d);
return 0;
}
static int intc_irq_set_type(struct irq_data *d, unsigned int type)
{
unsigned int ebit, irq = d->irq;
u16 pa, tb;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
tb = 0x1;
break;
case IRQ_TYPE_EDGE_FALLING:
tb = 0x2;
break;
case IRQ_TYPE_EDGE_BOTH:
tb = 0x3;
break;
default:
/* Level triggered */
tb = 0;
break;
}
if (tb)
irq_set_handler(irq, handle_edge_irq);
ebit = irq2ebit(irq) * 2;
pa = __raw_readw(MCFEPORT_EPPAR);
pa = (pa & ~(0x3 << ebit)) | (tb << ebit);
__raw_writew(pa, MCFEPORT_EPPAR);
return 0;
}
static struct irq_chip intc_irq_chip = {
.name = "CF-INTC",
.irq_startup = intc_irq_startup,
.irq_mask = intc_irq_mask,
.irq_unmask = intc_irq_unmask,
};
static struct irq_chip intc_irq_chip_edge_port = {
.name = "CF-INTC-EP",
.irq_startup = intc_irq_startup,
.irq_mask = intc_irq_mask,
.irq_unmask = intc_irq_unmask,
.irq_ack = intc_irq_ack,
.irq_set_type = intc_irq_set_type,
};
void __init init_IRQ(void)
{
int irq, eirq;
/* Mask all interrupt sources */
__raw_writeb(0xff, MCFINTC0_SIMR);
if (MCFINTC1_SIMR)
__raw_writeb(0xff, MCFINTC1_SIMR);
if (MCFINTC2_SIMR)
__raw_writeb(0xff, MCFINTC2_SIMR);
eirq = MCFINT_VECBASE + 64 + (MCFINTC1_ICR0 ? 64 : 0) +
(MCFINTC2_ICR0 ? 64 : 0);
for (irq = MCFINT_VECBASE; (irq < eirq); irq++) {
if ((irq >= EINT1) && (irq <= EINT7))
irq_set_chip(irq, &intc_irq_chip_edge_port);
else
irq_set_chip(irq, &intc_irq_chip);
irq_set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
irq_set_handler(irq, handle_level_irq);
}
}
|
