| /* |
| * arch/mips/vr41xx/nec-cmbvr4133/irq.c |
| * |
| * Interrupt routines for the NEC CMB-VR4133 board. |
| * |
| * Author: Yoichi Yuasa <yyuasa@mvista.com, or source@mvista.com> and |
| * Alex Sapkov <asapkov@ru.mvista.com> |
| * |
| * 2003-2004 (c) MontaVista, Software, Inc. This file is licensed under |
| * the terms of the GNU General Public License version 2. This program |
| * is licensed "as is" without any warranty of any kind, whether express |
| * or implied. |
| * |
| * Support for NEC-CMBVR4133 in 2.6 |
| * Manish Lachwani (mlachwani@mvista.com) |
| */ |
| #include <linux/bitops.h> |
| #include <linux/errno.h> |
| #include <linux/init.h> |
| #include <linux/ioport.h> |
| #include <linux/interrupt.h> |
| |
| #include <asm/io.h> |
| #include <asm/vr41xx/cmbvr4133.h> |
| |
| extern void enable_8259A_irq(unsigned int irq); |
| extern void disable_8259A_irq(unsigned int irq); |
| extern void mask_and_ack_8259A(unsigned int irq); |
| extern void init_8259A(int hoge); |
| |
| extern int vr4133_rockhopper; |
| |
| static unsigned int startup_i8259_irq(unsigned int irq) |
| { |
| enable_8259A_irq(irq - I8259_IRQ_BASE); |
| return 0; |
| } |
| |
| static void shutdown_i8259_irq(unsigned int irq) |
| { |
| disable_8259A_irq(irq - I8259_IRQ_BASE); |
| } |
| |
| static void enable_i8259_irq(unsigned int irq) |
| { |
| enable_8259A_irq(irq - I8259_IRQ_BASE); |
| } |
| |
| static void disable_i8259_irq(unsigned int irq) |
| { |
| disable_8259A_irq(irq - I8259_IRQ_BASE); |
| } |
| |
| static void ack_i8259_irq(unsigned int irq) |
| { |
| mask_and_ack_8259A(irq - I8259_IRQ_BASE); |
| } |
| |
| static void end_i8259_irq(unsigned int irq) |
| { |
| if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) |
| enable_8259A_irq(irq - I8259_IRQ_BASE); |
| } |
| |
| static struct irq_chip i8259_irq_type = { |
| .typename = "XT-PIC", |
| .startup = startup_i8259_irq, |
| .shutdown = shutdown_i8259_irq, |
| .enable = enable_i8259_irq, |
| .disable = disable_i8259_irq, |
| .ack = ack_i8259_irq, |
| .end = end_i8259_irq, |
| }; |
| |
| static int i8259_get_irq_number(int irq) |
| { |
| unsigned long isr; |
| |
| isr = inb(0x20); |
| irq = ffz(~isr); |
| if (irq == 2) { |
| isr = inb(0xa0); |
| irq = 8 + ffz(~isr); |
| } |
| |
| if (irq < 0 || irq > 15) |
| return -EINVAL; |
| |
| return I8259_IRQ_BASE + irq; |
| } |
| |
| static struct irqaction i8259_slave_cascade = { |
| .handler = &no_action, |
| .name = "cascade", |
| }; |
| |
| void __init rockhopper_init_irq(void) |
| { |
| int i; |
| |
| if(!vr4133_rockhopper) { |
| printk(KERN_ERR "Not a Rockhopper Board \n"); |
| return; |
| } |
| |
| for (i = I8259_IRQ_BASE; i <= I8259_IRQ_LAST; i++) |
| irq_desc[i].chip = &i8259_irq_type; |
| |
| setup_irq(I8259_SLAVE_IRQ, &i8259_slave_cascade); |
| |
| vr41xx_set_irq_trigger(CMBVR41XX_INTC_PIN, TRIGGER_LEVEL, SIGNAL_THROUGH); |
| vr41xx_set_irq_level(CMBVR41XX_INTC_PIN, LEVEL_HIGH); |
| vr41xx_cascade_irq(CMBVR41XX_INTC_IRQ, i8259_get_irq_number); |
| } |