projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * arch/mips/vr41xx/nec-cmbvr4133/irq.c | |
| 3 | * | |
| 4 | * Interrupt routines for the NEC CMB-VR4133 board. | |
| 5 | * | |
| 6 | * Author: Yoichi Yuasa <yyuasa@mvista.com, or source@mvista.com> and | |
| 7 | * Alex Sapkov <asapkov@ru.mvista.com> | |
| 8 | * | |
| 9 | * 2003-2004 (c) MontaVista, Software, Inc. This file is licensed under | |
| 10 | * the terms of the GNU General Public License version 2. This program | |
| 11 | * is licensed "as is" without any warranty of any kind, whether express | |
| 12 | * or implied. | |
| 13 | * | |
| 14 | * Support for NEC-CMBVR4133 in 2.6 | |
| 15 | * Manish Lachwani (mlachwani@mvista.com) | |
| 16 | */ | |
| 17 | #include <linux/bitops.h> | |
| 18 | #include <linux/errno.h> | |
| 19 | #include <linux/init.h> | |
| 20 | #include <linux/ioport.h> | |
| 21 | #include <linux/interrupt.h> | |
| 22 | ||
| 23 | #include <asm/io.h> | |
| 24 | #include <asm/vr41xx/cmbvr4133.h> | |
| 25 | ||
| 26 | extern void enable_8259A_irq(unsigned int irq); | |
| 27 | extern void disable_8259A_irq(unsigned int irq); | |
| 28 | extern void mask_and_ack_8259A(unsigned int irq); | |
| 29 | extern void init_8259A(int hoge); | |
| 30 | ||
| 31 | extern int vr4133_rockhopper; | |
| 32 | ||
| 1da177e4 LT |
33 | static void enable_i8259_irq(unsigned int irq) |
| 34 | { | |
| 35 | enable_8259A_irq(irq - I8259_IRQ_BASE); | |
| 36 | } | |
| 37 | ||
| 38 | static void disable_i8259_irq(unsigned int irq) | |
| 39 | { | |
| 40 | disable_8259A_irq(irq - I8259_IRQ_BASE); | |
| 41 | } | |
| 42 | ||
| 43 | static void ack_i8259_irq(unsigned int irq) | |
| 44 | { | |
| 45 | mask_and_ack_8259A(irq - I8259_IRQ_BASE); | |
| 46 | } | |
| 47 | ||
| 48 | static void end_i8259_irq(unsigned int irq) | |
| 49 | { | |
| 50 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) | |
| 51 | enable_8259A_irq(irq - I8259_IRQ_BASE); | |
| 52 | } | |
| 53 | ||
| 94dee171 | 54 | static struct irq_chip i8259_irq_type = { |
| 1da177e4 | 55 | .typename = "XT-PIC", |
| 1da177e4 | 56 | .ack = ack_i8259_irq, |
| 1603b5ac AN |
57 | .mask = disable_i8259_irq, |
| 58 | .mask_ack = ack_i8259_irq, | |
| 59 | .unmask = enable_i8259_irq, | |
| 1da177e4 LT |
60 | .end = end_i8259_irq, |
| 61 | }; | |
| 62 | ||
| 63 | static int i8259_get_irq_number(int irq) | |
| 64 | { | |
| 65 | unsigned long isr; | |
| 66 | ||
| 67 | isr = inb(0x20); | |
| 68 | irq = ffz(~isr); | |
| 69 | if (irq == 2) { | |
| 70 | isr = inb(0xa0); | |
| 71 | irq = 8 + ffz(~isr); | |
| 72 | } | |
| 73 | ||
| 74 | if (irq < 0 || irq > 15) | |
| 75 | return -EINVAL; | |
| 76 | ||
| 77 | return I8259_IRQ_BASE + irq; | |
| 78 | } | |
| 79 | ||
| 80 | static struct irqaction i8259_slave_cascade = { | |
| 81 | .handler = &no_action, | |
| 82 | .name = "cascade", | |
| 83 | }; | |
| 84 | ||
| 85 | void __init rockhopper_init_irq(void) | |
| 86 | { | |
| 87 | int i; | |
| 88 | ||
| 89 | if(!vr4133_rockhopper) { | |
| 90 | printk(KERN_ERR "Not a Rockhopper Board \n"); | |
| 91 | return; | |
| 92 | } | |
| 93 | ||
| 94 | for (i = I8259_IRQ_BASE; i <= I8259_IRQ_LAST; i++) | |
| 1603b5ac | 95 | set_irq_chip(i, &i8259_irq_type); |
| 1da177e4 LT |
96 | |
| 97 | setup_irq(I8259_SLAVE_IRQ, &i8259_slave_cascade); | |
| 98 | ||
| 99 | vr41xx_set_irq_trigger(CMBVR41XX_INTC_PIN, TRIGGER_LEVEL, SIGNAL_THROUGH); | |
| 100 | vr41xx_set_irq_level(CMBVR41XX_INTC_PIN, LEVEL_HIGH); | |
| 101 | vr41xx_cascade_irq(CMBVR41XX_INTC_IRQ, i8259_get_irq_number); | |
| 102 | } |