1 /*
2 * intc-2.c
3 *
4 * General interrupt controller code for the many ColdFire cores that use
5 * interrupt controllers with 63 interrupt sources, organized as 56 fully-
6 * programmable + 7 fixed-level interrupt sources. This includes the 523x
7 * family, the 5270, 5271, 5274, 5275, and the 528x family which have two such
8 * controllers, and the 547x and 548x families which have only one of them.
9 *
10 * The external 7 fixed interrupts are part of the Edge Port unit of these
11 * ColdFire parts. They can be configured as level or edge triggered.
12 *
13 * (C) Copyright 2009-2011, Greg Ungerer <gerg@snapgear.com>
14 *
15 * This file is subject to the terms and conditions of the GNU General Public
16 * License. See the file COPYING in the main directory of this archive
17 * for more details.
18 */
19
20 #include <linux/types.h>
21 #include <linux/init.h>
22 #include <linux/kernel.h>
23 #include <linux/interrupt.h>
24 #include <linux/irq.h>
25 #include <linux/io.h>
26 #include <asm/coldfire.h>
27 #include <asm/mcfsim.h>
28 #include <asm/traps.h>
29
30 /*
31 * Bit definitions for the ICR family of registers.
32 */
33 #define MCFSIM_ICR_LEVEL(l) ((l)<<3) /* Level l intr */
34 #define MCFSIM_ICR_PRI(p) (p) /* Priority p intr */
35
36 /*
37 * The EDGE Port interrupts are the fixed 7 external interrupts.
38 * They need some special treatment, for example they need to be acked.
39 */
40 #define EINT0 64 /* Is not actually used, but spot reserved for it */
41 #define EINT1 65 /* EDGE Port interrupt 1 */
42 #define EINT7 71 /* EDGE Port interrupt 7 */
43
44 #ifdef MCFICM_INTC1
45 #define NR_VECS 128
46 #else
47 #define NR_VECS 64
48 #endif
49
50 static void intc_irq_mask(struct irq_data *d)
51 {
52 unsigned int irq = d->irq - MCFINT_VECBASE;
53 unsigned long imraddr;
54 u32 val, imrbit;
55
56 #ifdef MCFICM_INTC1
57 imraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
58 #else
59 imraddr = MCFICM_INTC0;
60 #endif
61 imraddr += (irq & 0x20) ? MCFINTC_IMRH : MCFINTC_IMRL;
62 imrbit = 0x1 << (irq & 0x1f);
63
64 val = __raw_readl(imraddr);
65 __raw_writel(val | imrbit, imraddr);
66 }
67
68 static void intc_irq_unmask(struct irq_data *d)
69 {
70 unsigned int irq = d->irq - MCFINT_VECBASE;
71 unsigned long imraddr;
72 u32 val, imrbit;
73
74 #ifdef MCFICM_INTC1
75 imraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
76 #else
77 imraddr = MCFICM_INTC0;
78 #endif
79 imraddr += ((irq & 0x20) ? MCFINTC_IMRH : MCFINTC_IMRL);
80 imrbit = 0x1 << (irq & 0x1f);
81
82 /* Don't set the "maskall" bit! */
83 if ((irq & 0x20) == 0)
84 imrbit |= 0x1;
85
86 val = __raw_readl(imraddr);
87 __raw_writel(val & ~imrbit, imraddr);
88 }
89
90 /*
91 * Only the external (or EDGE Port) interrupts need to be acknowledged
92 * here, as part of the IRQ handler. They only really need to be ack'ed
93 * if they are in edge triggered mode, but there is no harm in doing it
94 * for all types.
95 */
96 static void intc_irq_ack(struct irq_data *d)
97 {
98 unsigned int irq = d->irq;
99
100 __raw_writeb(0x1 << (irq - EINT0), MCFEPORT_EPFR);
101 }
102
103 /*
104 * Each vector needs a unique priority and level associated with it.
105 * We don't really care so much what they are, we don't rely on the
106 * traditional priority interrupt scheme of the m68k/ColdFire. This
107 * only needs to be set once for an interrupt, and we will never change
108 * these values once we have set them.
109 */
110 static u8 intc_intpri = MCFSIM_ICR_LEVEL(6) | MCFSIM_ICR_PRI(6);
111
112 static unsigned int intc_irq_startup(struct irq_data *d)
113 {
114 unsigned int irq = d->irq - MCFINT_VECBASE;
115 unsigned long icraddr;
116
117 #ifdef MCFICM_INTC1
118 icraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
119 #else
120 icraddr = MCFICM_INTC0;
121 #endif
122 icraddr += MCFINTC_ICR0 + (irq & 0x3f);
123 if (__raw_readb(icraddr) == 0)
124 __raw_writeb(intc_intpri--, icraddr);
125
126 irq = d->irq;
127 if ((irq >= EINT1) && (irq <= EINT7)) {
128 u8 v;
129
130 irq -= EINT0;
131
132 /* Set EPORT line as input */
133 v = __raw_readb(MCFEPORT_EPDDR);
134 __raw_writeb(v & ~(0x1 << irq), MCFEPORT_EPDDR);
135
136 /* Set EPORT line as interrupt source */
137 v = __raw_readb(MCFEPORT_EPIER);
138 __raw_writeb(v | (0x1 << irq), MCFEPORT_EPIER);
139 }
140
141 intc_irq_unmask(d);
142 return 0;
143 }
144
145 static int intc_irq_set_type(struct irq_data *d, unsigned int type)
146 {
147 unsigned int irq = d->irq;
148 u16 pa, tb;
149
150 switch (type) {
151 case IRQ_TYPE_EDGE_RISING:
152 tb = 0x1;
153 break;
154 case IRQ_TYPE_EDGE_FALLING:
155 tb = 0x2;
156 break;
157 case IRQ_TYPE_EDGE_BOTH:
158 tb = 0x3;
159 break;
160 default:
161 /* Level triggered */
162 tb = 0;
163 break;
164 }
165
166 if (tb)
167 irq_set_handler(irq, handle_edge_irq);
168
169 irq -= EINT0;
170 pa = __raw_readw(MCFEPORT_EPPAR);
171 pa = (pa & ~(0x3 << (irq * 2))) | (tb << (irq * 2));
172 __raw_writew(pa, MCFEPORT_EPPAR);
173
174 return 0;
175 }
176
177 static struct irq_chip intc_irq_chip = {
178 .name = "CF-INTC",
179 .irq_startup = intc_irq_startup,
180 .irq_mask = intc_irq_mask,
181 .irq_unmask = intc_irq_unmask,
182 };
183
184 static struct irq_chip intc_irq_chip_edge_port = {
185 .name = "CF-INTC-EP",
186 .irq_startup = intc_irq_startup,
187 .irq_mask = intc_irq_mask,
188 .irq_unmask = intc_irq_unmask,
189 .irq_ack = intc_irq_ack,
190 .irq_set_type = intc_irq_set_type,
191 };
192
193 void __init init_IRQ(void)
194 {
195 int irq;
196
197 /* Mask all interrupt sources */
198 __raw_writel(0x1, MCFICM_INTC0 + MCFINTC_IMRL);
199 #ifdef MCFICM_INTC1
200 __raw_writel(0x1, MCFICM_INTC1 + MCFINTC_IMRL);
201 #endif
202
203 for (irq = MCFINT_VECBASE; (irq < MCFINT_VECBASE + NR_VECS); irq++) {
204 if ((irq >= EINT1) && (irq <=EINT7))
205 irq_set_chip(irq, &intc_irq_chip_edge_port);
206 else
207 irq_set_chip(irq, &intc_irq_chip);
208 irq_set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
209 irq_set_handler(irq, handle_level_irq);
210 }
211 }
212
213
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