1 /*
2 * intc-simr.c
3 *
4 * Interrupt controller code for the ColdFire 5208, 5207 & 532x parts.
5 *
6 * (C) Copyright 2009-2011, Greg Ungerer <gerg@snapgear.com>
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/types.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <linux/io.h>
19 #include <asm/coldfire.h>
20 #include <asm/mcfsim.h>
21 #include <asm/traps.h>
22
23 /*
24 * The EDGE Port interrupts are the fixed 7 external interrupts.
25 * They need some special treatment, for example they need to be acked.
26 */
27 #ifdef CONFIG_M520x
28 /*
29 * The 520x parts only support a limited range of these external
30 * interrupts, only 1, 4 and 7 (as interrupts 65, 66 and 67).
31 */
32 #define EINT0 64 /* Is not actually used, but spot reserved for it */
33 #define EINT1 65 /* EDGE Port interrupt 1 */
34 #define EINT4 66 /* EDGE Port interrupt 4 */
35 #define EINT7 67 /* EDGE Port interrupt 7 */
36
37 static unsigned int irqebitmap[] = { 0, 1, 4, 7 };
38 static inline unsigned int irq2ebit(unsigned int irq)
39 {
40 return irqebitmap[irq - EINT0];
41 }
42
43 #else
44
45 /*
46 * Most of the ColdFire parts with the EDGE Port module just have
47 * a strait direct mapping of the 7 external interrupts. Although
48 * there is a bit reserved for 0, it is not used.
49 */
50 #define EINT0 64 /* Is not actually used, but spot reserved for it */
51 #define EINT1 65 /* EDGE Port interrupt 1 */
52 #define EINT7 71 /* EDGE Port interrupt 7 */
53
54 static inline unsigned int irq2ebit(unsigned int irq)
55 {
56 return irq - EINT0;
57 }
58
59 #endif
60
61 /*
62 * There maybe one, two or three interrupt control units, each has 64
63 * interrupts. If there is no second or third unit then MCFINTC1_* or
64 * MCFINTC2_* defines will be 0 (and code for them optimized away).
65 */
66
67 static void intc_irq_mask(struct irq_data *d)
68 {
69 unsigned int irq = d->irq - MCFINT_VECBASE;
70
71 if (MCFINTC2_SIMR && (irq > 127))
72 __raw_writeb(irq - 128, MCFINTC2_SIMR);
73 else if (MCFINTC1_SIMR && (irq > 63))
74 __raw_writeb(irq - 64, MCFINTC1_SIMR);
75 else
76 __raw_writeb(irq, MCFINTC0_SIMR);
77 }
78
79 static void intc_irq_unmask(struct irq_data *d)
80 {
81 unsigned int irq = d->irq - MCFINT_VECBASE;
82
83 if (MCFINTC2_CIMR && (irq > 127))
84 __raw_writeb(irq - 128, MCFINTC2_CIMR);
85 else if (MCFINTC1_CIMR && (irq > 63))
86 __raw_writeb(irq - 64, MCFINTC1_CIMR);
87 else
88 __raw_writeb(irq, MCFINTC0_CIMR);
89 }
90
91 static void intc_irq_ack(struct irq_data *d)
92 {
93 unsigned int ebit = irq2ebit(d->irq);
94
95 __raw_writeb(0x1 << ebit, MCFEPORT_EPFR);
96 }
97
98 static unsigned int intc_irq_startup(struct irq_data *d)
99 {
100 unsigned int irq = d->irq;
101
102 if ((irq >= EINT1) && (irq <= EINT7)) {
103 unsigned int ebit = irq2ebit(irq);
104 u8 v;
105
106 #if defined(MCFEPORT_EPDDR)
107 /* Set EPORT line as input */
108 v = __raw_readb(MCFEPORT_EPDDR);
109 __raw_writeb(v & ~(0x1 << ebit), MCFEPORT_EPDDR);
110 #endif
111
112 /* Set EPORT line as interrupt source */
113 v = __raw_readb(MCFEPORT_EPIER);
114 __raw_writeb(v | (0x1 << ebit), MCFEPORT_EPIER);
115 }
116
117 irq -= MCFINT_VECBASE;
118 if (MCFINTC2_ICR0 && (irq > 127))
119 __raw_writeb(5, MCFINTC2_ICR0 + irq - 128);
120 else if (MCFINTC1_ICR0 && (irq > 63))
121 __raw_writeb(5, MCFINTC1_ICR0 + irq - 64);
122 else
123 __raw_writeb(5, MCFINTC0_ICR0 + irq);
124
125 intc_irq_unmask(d);
126 return 0;
127 }
128
129 static int intc_irq_set_type(struct irq_data *d, unsigned int type)
130 {
131 unsigned int ebit, irq = d->irq;
132 u16 pa, tb;
133
134 switch (type) {
135 case IRQ_TYPE_EDGE_RISING:
136 tb = 0x1;
137 break;
138 case IRQ_TYPE_EDGE_FALLING:
139 tb = 0x2;
140 break;
141 case IRQ_TYPE_EDGE_BOTH:
142 tb = 0x3;
143 break;
144 default:
145 /* Level triggered */
146 tb = 0;
147 break;
148 }
149
150 if (tb)
151 irq_set_handler(irq, handle_edge_irq);
152
153 ebit = irq2ebit(irq) * 2;
154 pa = __raw_readw(MCFEPORT_EPPAR);
155 pa = (pa & ~(0x3 << ebit)) | (tb << ebit);
156 __raw_writew(pa, MCFEPORT_EPPAR);
157
158 return 0;
159 }
160
161 static struct irq_chip intc_irq_chip = {
162 .name = "CF-INTC",
163 .irq_startup = intc_irq_startup,
164 .irq_mask = intc_irq_mask,
165 .irq_unmask = intc_irq_unmask,
166 };
167
168 static struct irq_chip intc_irq_chip_edge_port = {
169 .name = "CF-INTC-EP",
170 .irq_startup = intc_irq_startup,
171 .irq_mask = intc_irq_mask,
172 .irq_unmask = intc_irq_unmask,
173 .irq_ack = intc_irq_ack,
174 .irq_set_type = intc_irq_set_type,
175 };
176
177 void __init init_IRQ(void)
178 {
179 int irq, eirq;
180
181 /* Mask all interrupt sources */
182 __raw_writeb(0xff, MCFINTC0_SIMR);
183 if (MCFINTC1_SIMR)
184 __raw_writeb(0xff, MCFINTC1_SIMR);
185 if (MCFINTC2_SIMR)
186 __raw_writeb(0xff, MCFINTC2_SIMR);
187
188 eirq = MCFINT_VECBASE + 64 + (MCFINTC1_ICR0 ? 64 : 0) +
189 (MCFINTC2_ICR0 ? 64 : 0);
190 for (irq = MCFINT_VECBASE; (irq < eirq); irq++) {
191 if ((irq >= EINT1) && (irq <= EINT7))
192 irq_set_chip(irq, &intc_irq_chip_edge_port);
193 else
194 irq_set_chip(irq, &intc_irq_chip);
195 irq_set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
196 irq_set_handler(irq, handle_level_irq);
197 }
198 }
199
200
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