4 * ADM5120 specific interrupt handlers
6 * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
7 * Copyright (C) 2007 OpenWrt.org
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the
21 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 * Boston, MA 02110-1301, USA.
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/version.h>
29 #include <linux/interrupt.h>
30 #include <linux/ioport.h>
34 #include <asm/irq_cpu.h>
35 #include <asm/mipsregs.h>
36 #include <asm/bitops.h>
38 #include <adm5120_defs.h>
39 #include <adm5120_irq.h>
41 #define INTC_WRITE(reg, val) __raw_writel((val), \
42 (void __iomem *)(KSEG1ADDR(ADM5120_INTC_BASE) + reg))
44 #define INTC_READ(reg) __raw_readl(\
45 (void __iomem *)(KSEG1ADDR(ADM5120_INTC_BASE) + reg))
47 static void adm5120_intc_irq_unmask(unsigned int irq);
48 static void adm5120_intc_irq_mask(unsigned int irq);
49 static int adm5120_intc_irq_set_type(unsigned int irq, unsigned int flow_type);
51 static struct irq_chip adm5120_intc_irq_chip = {
53 .unmask = adm5120_intc_irq_unmask,
54 .mask = adm5120_intc_irq_mask,
55 .mask_ack = adm5120_intc_irq_mask,
56 .set_type = adm5120_intc_irq_set_type
59 static struct irqaction adm5120_intc_irq_action = {
61 .name = "cascade [INTC]"
64 static void adm5120_intc_irq_unmask(unsigned int irq)
66 irq -= ADM5120_INTC_IRQ_BASE;
67 INTC_WRITE(INTC_REG_IRQ_ENABLE, 1 << irq);
70 static void adm5120_intc_irq_mask(unsigned int irq)
72 irq -= ADM5120_INTC_IRQ_BASE;
73 INTC_WRITE(INTC_REG_IRQ_DISABLE, 1 << irq);
76 static int adm5120_intc_irq_set_type(unsigned int irq, unsigned int flow_type)
78 /* TODO: not yet tested */
84 sense = flow_type & (IRQ_TYPE_SENSE_MASK);
87 case IRQ_TYPE_LEVEL_HIGH:
89 case IRQ_TYPE_LEVEL_LOW:
91 case ADM5120_IRQ_GPIO2:
92 case ADM5120_IRQ_GPIO4:
108 case ADM5120_IRQ_GPIO2:
109 case ADM5120_IRQ_GPIO4:
110 mode = INTC_READ(INTC_REG_INT_MODE);
111 if (sense == IRQ_TYPE_LEVEL_LOW)
112 mode |= (1 << (irq-ADM5120_INTC_IRQ_BASE));
114 mode &= (1 << (irq-ADM5120_INTC_IRQ_BASE));
116 INTC_WRITE(INTC_REG_INT_MODE, mode);
119 irq_desc[irq].status &= ~IRQ_TYPE_SENSE_MASK;
120 irq_desc[irq].status |= sense;
127 static void adm5120_intc_irq_dispatch(void)
129 unsigned long status;
132 /* dispatch only one IRQ at a time */
133 status = INTC_READ(INTC_REG_IRQ_STATUS) & INTC_INT_ALL;
136 irq = ADM5120_INTC_IRQ_BASE+fls(status)-1;
139 spurious_interrupt();
142 asmlinkage void plat_irq_dispatch(void)
144 unsigned long pending;
146 pending = read_c0_status() & read_c0_cause() & ST0_IM;
148 if (pending & STATUSF_IP7)
149 do_IRQ(ADM5120_IRQ_COUNTER);
150 else if (pending & STATUSF_IP2)
151 adm5120_intc_irq_dispatch();
153 spurious_interrupt();
156 #define INTC_IRQ_STATUS (IRQ_LEVEL | IRQ_TYPE_LEVEL_HIGH | IRQ_DISABLED)
158 static void __init adm5120_intc_irq_init(int base)
162 /* disable all interrupts */
163 INTC_WRITE(INTC_REG_IRQ_DISABLE, INTC_INT_ALL);
165 /* setup all interrupts to generate IRQ instead of FIQ */
166 INTC_WRITE(INTC_REG_INT_MODE, 0);
168 /* set active level for all external interrupts to HIGH */
169 INTC_WRITE(INTC_REG_INT_LEVEL, 0);
171 /* disable usage of the TEST_SOURCE register */
172 INTC_WRITE(INTC_REG_IRQ_SOURCE_SELECT, 0);
174 for (i = ADM5120_INTC_IRQ_BASE;
175 i <= ADM5120_INTC_IRQ_BASE+INTC_IRQ_LAST;
177 irq_desc[i].status = INTC_IRQ_STATUS;
178 set_irq_chip_and_handler(i, &adm5120_intc_irq_chip,
182 setup_irq(ADM5120_IRQ_INTC, &adm5120_intc_irq_action);
185 void __init arch_init_irq(void) {
187 adm5120_intc_irq_init(ADM5120_INTC_IRQ_BASE);