1 /*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License as published by the
4 * Free Software Foundation; either version 2 of the License, or (at your
5 * option) any later version.
6 *
7 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
8 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
10 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
11 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
12 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
13 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
14 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
15 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
16 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * Copyright 2002 MontaVista Software Inc.
23 * Author: MontaVista Software, Inc.
24 * stevel@mvista.com or source@mvista.com
25 */
26
27 #include <linux/bitops.h>
28 #include <linux/errno.h>
29 #include <linux/init.h>
30 #include <linux/io.h>
31 #include <linux/kernel_stat.h>
32 #include <linux/signal.h>
33 #include <linux/sched.h>
34 #include <linux/types.h>
35 #include <linux/interrupt.h>
36 #include <linux/ioport.h>
37 #include <linux/timex.h>
38 #include <linux/random.h>
39 #include <linux/delay.h>
40
41 #include <asm/bootinfo.h>
42 #include <asm/time.h>
43 #include <asm/mipsregs.h>
44
45 #include <asm/mach-rc32434/irq.h>
46 #include <asm/mach-rc32434/gpio.h>
47
48 struct intr_group {
49 u32 mask; /* mask of valid bits in pending/mask registers */
50 volatile u32 *base_addr;
51 };
52
53 #define RC32434_NR_IRQS (GROUP4_IRQ_BASE + 32)
54
55 #if (NR_IRQS < RC32434_NR_IRQS)
56 #error Too little irqs defined. Did you override <asm/irq.h> ?
57 #endif
58
59 static const struct intr_group intr_group[NUM_INTR_GROUPS] = {
60 {
61 .mask = 0x0000efff,
62 .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0 * IC_GROUP_OFFSET)},
63 {
64 .mask = 0x00001fff,
65 .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 1 * IC_GROUP_OFFSET)},
66 {
67 .mask = 0x00000007,
68 .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 2 * IC_GROUP_OFFSET)},
69 {
70 .mask = 0x0003ffff,
71 .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 3 * IC_GROUP_OFFSET)},
72 {
73 .mask = 0xffffffff,
74 .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 4 * IC_GROUP_OFFSET)}
75 };
76
77 #define READ_PEND(base) (*(base))
78 #define READ_MASK(base) (*(base + 2))
79 #define WRITE_MASK(base, val) (*(base + 2) = (val))
80
81 static inline int irq_to_group(unsigned int irq_nr)
82 {
83 return (irq_nr - GROUP0_IRQ_BASE) >> 5;
84 }
85
86 static inline int group_to_ip(unsigned int group)
87 {
88 return group + 2;
89 }
90
91 static inline void enable_local_irq(unsigned int ip)
92 {
93 int ipnum = 0x100 << ip;
94
95 set_c0_status(ipnum);
96 }
97
98 static inline void disable_local_irq(unsigned int ip)
99 {
100 int ipnum = 0x100 << ip;
101
102 clear_c0_status(ipnum);
103 }
104
105 static inline void ack_local_irq(unsigned int ip)
106 {
107 int ipnum = 0x100 << ip;
108
109 clear_c0_cause(ipnum);
110 }
111
112 static void rb532_enable_irq(struct irq_data *d)
113 {
114 unsigned int group, intr_bit, irq_nr = d->irq;
115 int ip = irq_nr - GROUP0_IRQ_BASE;
116 volatile unsigned int *addr;
117
118 if (ip < 0)
119 enable_local_irq(irq_nr);
120 else {
121 group = ip >> 5;
122
123 ip &= (1 << 5) - 1;
124 intr_bit = 1 << ip;
125
126 enable_local_irq(group_to_ip(group));
127
128 addr = intr_group[group].base_addr;
129 WRITE_MASK(addr, READ_MASK(addr) & ~intr_bit);
130 }
131 }
132
133 static void rb532_disable_irq(struct irq_data *d)
134 {
135 unsigned int group, intr_bit, mask, irq_nr = d->irq;
136 int ip = irq_nr - GROUP0_IRQ_BASE;
137 volatile unsigned int *addr;
138
139 if (ip < 0) {
140 disable_local_irq(irq_nr);
141 } else {
142 group = ip >> 5;
143
144 ip &= (1 << 5) - 1;
145 intr_bit = 1 << ip;
146 addr = intr_group[group].base_addr;
147 mask = READ_MASK(addr);
148 mask |= intr_bit;
149 WRITE_MASK(addr, mask);
150
151 /* There is a maximum of 14 GPIO interrupts */
152 if (group == GPIO_MAPPED_IRQ_GROUP && irq_nr <= (GROUP4_IRQ_BASE + 13))
153 rb532_gpio_set_istat(0, irq_nr - GPIO_MAPPED_IRQ_BASE);
154
155 /*
156 * if there are no more interrupts enabled in this
157 * group, disable corresponding IP
158 */
159 if (mask == intr_group[group].mask)
160 disable_local_irq(group_to_ip(group));
161 }
162 }
163
164 static void rb532_mask_and_ack_irq(struct irq_data *d)
165 {
166 rb532_disable_irq(d);
167 ack_local_irq(group_to_ip(irq_to_group(d->irq)));
168 }
169
170 static int rb532_set_type(struct irq_data *d, unsigned type)
171 {
172 int gpio = d->irq - GPIO_MAPPED_IRQ_BASE;
173 int group = irq_to_group(d->irq);
174
175 if (group != GPIO_MAPPED_IRQ_GROUP || d->irq > (GROUP4_IRQ_BASE + 13))
176 return (type == IRQ_TYPE_LEVEL_HIGH) ? 0 : -EINVAL;
177
178 switch (type) {
179 case IRQ_TYPE_LEVEL_HIGH:
180 rb532_gpio_set_ilevel(1, gpio);
181 break;
182 case IRQ_TYPE_LEVEL_LOW:
183 rb532_gpio_set_ilevel(0, gpio);
184 break;
185 default:
186 return -EINVAL;
187 }
188
189 return 0;
190 }
191
192 static struct irq_chip rc32434_irq_type = {
193 .name = "RB532",
194 .irq_ack = rb532_disable_irq,
195 .irq_mask = rb532_disable_irq,
196 .irq_mask_ack = rb532_mask_and_ack_irq,
197 .irq_unmask = rb532_enable_irq,
198 .irq_set_type = rb532_set_type,
199 };
200
201 void __init arch_init_irq(void)
202 {
203 int i;
204
205 pr_info("Initializing IRQ's: %d out of %d\n", RC32434_NR_IRQS, NR_IRQS);
206
207 for (i = 0; i < RC32434_NR_IRQS; i++)
208 irq_set_chip_and_handler(i, &rc32434_irq_type,
209 handle_level_irq);
210 }
211
212 /* Main Interrupt dispatcher */
213 asmlinkage void plat_irq_dispatch(void)
214 {
215 unsigned int ip, pend, group;
216 volatile unsigned int *addr;
217 unsigned int cp0_cause = read_c0_cause() & read_c0_status();
218
219 if (cp0_cause & CAUSEF_IP7) {
220 do_IRQ(7);
221 } else {
222 ip = (cp0_cause & 0x7c00);
223 if (ip) {
224 group = 21 + (fls(ip) - 32);
225
226 addr = intr_group[group].base_addr;
227
228 pend = READ_PEND(addr);
229 pend &= ~READ_MASK(addr); /* only unmasked interrupts */
230 pend = 39 + (fls(pend) - 32);
231 do_IRQ((group << 5) + pend);
232 }
233 }
234 }
235
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