2 * arch/mips/emma2rh/markeins/irq.c
3 * This file defines the irq handler for EMMA2RH.
5 * Copyright (C) NEC Electronics Corporation 2004-2006
7 * This file is based on the arch/mips/ddb5xxx/ddb5477/irq.c
9 * Copyright 2001 MontaVista Software Inc.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/irq.h>
28 #include <linux/types.h>
29 #include <linux/ptrace.h>
30 #include <linux/delay.h>
32 #include <asm/irq_cpu.h>
33 #include <asm/system.h>
34 #include <asm/mipsregs.h>
35 #include <asm/addrspace.h>
36 #include <asm/bootinfo.h>
38 #include <asm/emma/emma2rh.h>
40 /* number of total irqs supported by EMMA2RH */
41 #define NUM_EMMA2RH_IRQ 96
46 * 0-7: 8 CPU interrupts
47 * 0 - software interrupt 0
48 * 1 - software interrupt 1
49 * 2 - most Vrc5477 interrupts are routed to this pin
50 * 3 - (optional) some other interrupts routed to this pin for debugg
54 * 7 - cpu timer (used by default)
58 void ll_emma2rh_irq_enable(int emma2rh_irq)
64 reg_index = EMMA2RH_BHIF_INT_EN_0 +
65 (EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0) *
67 reg_value = emma2rh_in32(reg_index);
68 reg_bitmask = 0x1 << (emma2rh_irq % 32);
69 emma2rh_out32(reg_index, reg_value | reg_bitmask);
72 void ll_emma2rh_irq_disable(int emma2rh_irq)
78 reg_index = EMMA2RH_BHIF_INT_EN_0 +
79 (EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0) *
81 reg_value = emma2rh_in32(reg_index);
82 reg_bitmask = 0x1 << (emma2rh_irq % 32);
83 emma2rh_out32(reg_index, reg_value & ~reg_bitmask);
86 static void emma2rh_irq_enable(unsigned int irq)
88 ll_emma2rh_irq_enable(irq - EMMA2RH_IRQ_BASE);
91 static void emma2rh_irq_disable(unsigned int irq)
93 ll_emma2rh_irq_disable(irq - EMMA2RH_IRQ_BASE);
96 struct irq_chip emma2rh_irq_controller = {
97 .name = "emma2rh_irq",
98 .ack = emma2rh_irq_disable,
99 .mask = emma2rh_irq_disable,
100 .mask_ack = emma2rh_irq_disable,
101 .unmask = emma2rh_irq_enable,
104 void emma2rh_irq_init(void)
108 for (i = 0; i < NUM_EMMA2RH_IRQ; i++)
109 set_irq_chip_and_handler(EMMA2RH_IRQ_BASE + i,
110 &emma2rh_irq_controller,
114 void ll_emma2rh_sw_irq_enable(int irq)
118 reg = emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
120 emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, reg);
123 void ll_emma2rh_sw_irq_disable(int irq)
127 reg = emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
129 emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, reg);
132 static void emma2rh_sw_irq_enable(unsigned int irq)
134 ll_emma2rh_sw_irq_enable(irq - EMMA2RH_SW_IRQ_BASE);
137 static void emma2rh_sw_irq_disable(unsigned int irq)
139 ll_emma2rh_sw_irq_disable(irq - EMMA2RH_SW_IRQ_BASE);
142 struct irq_chip emma2rh_sw_irq_controller = {
143 .name = "emma2rh_sw_irq",
144 .ack = emma2rh_sw_irq_disable,
145 .mask = emma2rh_sw_irq_disable,
146 .mask_ack = emma2rh_sw_irq_disable,
147 .unmask = emma2rh_sw_irq_enable,
150 void emma2rh_sw_irq_init(void)
154 for (i = 0; i < NUM_EMMA2RH_IRQ_SW; i++)
155 set_irq_chip_and_handler(EMMA2RH_SW_IRQ_BASE + i,
156 &emma2rh_sw_irq_controller,
160 void ll_emma2rh_gpio_irq_enable(int irq)
164 reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
166 emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
169 void ll_emma2rh_gpio_irq_disable(int irq)
173 reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
175 emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
178 static void emma2rh_gpio_irq_enable(unsigned int irq)
180 ll_emma2rh_gpio_irq_enable(irq - EMMA2RH_GPIO_IRQ_BASE);
183 static void emma2rh_gpio_irq_disable(unsigned int irq)
185 ll_emma2rh_gpio_irq_disable(irq - EMMA2RH_GPIO_IRQ_BASE);
188 static void emma2rh_gpio_irq_ack(unsigned int irq)
190 irq -= EMMA2RH_GPIO_IRQ_BASE;
191 emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~(1 << irq));
192 ll_emma2rh_gpio_irq_disable(irq);
195 static void emma2rh_gpio_irq_end(unsigned int irq)
197 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
198 ll_emma2rh_gpio_irq_enable(irq - EMMA2RH_GPIO_IRQ_BASE);
201 struct irq_chip emma2rh_gpio_irq_controller = {
202 .name = "emma2rh_gpio_irq",
203 .ack = emma2rh_gpio_irq_ack,
204 .mask = emma2rh_gpio_irq_disable,
205 .mask_ack = emma2rh_gpio_irq_ack,
206 .unmask = emma2rh_gpio_irq_enable,
207 .end = emma2rh_gpio_irq_end,
210 void emma2rh_gpio_irq_init(void)
214 for (i = 0; i < NUM_EMMA2RH_IRQ_GPIO; i++)
215 set_irq_chip(EMMA2RH_GPIO_IRQ_BASE + i,
216 &emma2rh_gpio_irq_controller);
219 static struct irqaction irq_cascade = {
220 .handler = no_action,
222 .mask = CPU_MASK_NONE,
229 * the first level int-handler will jump here if it is a emma2rh irq
231 void emma2rh_irq_dispatch(void)
237 intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_0) &
238 emma2rh_in32(EMMA2RH_BHIF_INT_EN_0);
240 #ifdef EMMA2RH_SW_CASCADE
242 (1 << ((EMMA2RH_SW_CASCADE - EMMA2RH_IRQ_INT0) & (32 - 1)))) {
244 swIntStatus = emma2rh_in32(EMMA2RH_BHIF_SW_INT)
245 & emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
246 for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
247 if (swIntStatus & bitmask) {
248 do_IRQ(EMMA2RH_SW_IRQ_BASE + i);
255 for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
256 if (intStatus & bitmask) {
257 do_IRQ(EMMA2RH_IRQ_BASE + i);
262 intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_1) &
263 emma2rh_in32(EMMA2RH_BHIF_INT_EN_1);
265 #ifdef EMMA2RH_GPIO_CASCADE
267 (1 << ((EMMA2RH_GPIO_CASCADE - EMMA2RH_IRQ_INT0) & (32 - 1)))) {
269 gpioIntStatus = emma2rh_in32(EMMA2RH_GPIO_INT_ST)
270 & emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
271 for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
272 if (gpioIntStatus & bitmask) {
273 do_IRQ(EMMA2RH_GPIO_IRQ_BASE + i);
280 for (i = 32, bitmask = 1; i < 64; i++, bitmask <<= 1) {
281 if (intStatus & bitmask) {
282 do_IRQ(EMMA2RH_IRQ_BASE + i);
287 intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_2) &
288 emma2rh_in32(EMMA2RH_BHIF_INT_EN_2);
290 for (i = 64, bitmask = 1; i < 96; i++, bitmask <<= 1) {
291 if (intStatus & bitmask) {
292 do_IRQ(EMMA2RH_IRQ_BASE + i);
298 void __init arch_init_irq(void)
302 /* by default, interrupts are disabled. */
303 emma2rh_out32(EMMA2RH_BHIF_INT_EN_0, 0);
304 emma2rh_out32(EMMA2RH_BHIF_INT_EN_1, 0);
305 emma2rh_out32(EMMA2RH_BHIF_INT_EN_2, 0);
306 emma2rh_out32(EMMA2RH_BHIF_INT1_EN_0, 0);
307 emma2rh_out32(EMMA2RH_BHIF_INT1_EN_1, 0);
308 emma2rh_out32(EMMA2RH_BHIF_INT1_EN_2, 0);
309 emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, 0);
311 clear_c0_status(0xff00);
312 set_c0_status(0x0400);
314 #define GPIO_PCI (0xf<<15)
315 /* setup GPIO interrupt for PCI interface */
316 /* direction input */
317 reg = emma2rh_in32(EMMA2RH_GPIO_DIR);
318 emma2rh_out32(EMMA2RH_GPIO_DIR, reg & ~GPIO_PCI);
319 /* disable interrupt */
320 reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
321 emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg & ~GPIO_PCI);
323 reg = emma2rh_in32(EMMA2RH_GPIO_INT_MODE);
324 emma2rh_out32(EMMA2RH_GPIO_INT_MODE, reg | GPIO_PCI);
325 reg = emma2rh_in32(EMMA2RH_GPIO_INT_CND_A);
326 emma2rh_out32(EMMA2RH_GPIO_INT_CND_A, reg & (~GPIO_PCI));
327 /* interrupt clear */
328 emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~GPIO_PCI);
330 /* init all controllers */
332 emma2rh_sw_irq_init();
333 emma2rh_gpio_irq_init();
336 /* setup cascade interrupts */
337 setup_irq(EMMA2RH_IRQ_BASE + EMMA2RH_SW_CASCADE, &irq_cascade);
338 setup_irq(EMMA2RH_IRQ_BASE + EMMA2RH_GPIO_CASCADE, &irq_cascade);
339 setup_irq(CPU_IRQ_BASE + CPU_EMMA2RH_CASCADE, &irq_cascade);
342 asmlinkage void plat_irq_dispatch(void)
344 unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
346 if (pending & STATUSF_IP7)
347 do_IRQ(CPU_IRQ_BASE + 7);
348 else if (pending & STATUSF_IP2)
349 emma2rh_irq_dispatch();
350 else if (pending & STATUSF_IP1)
351 do_IRQ(CPU_IRQ_BASE + 1);
352 else if (pending & STATUSF_IP0)
353 do_IRQ(CPU_IRQ_BASE + 0);
355 spurious_interrupt();