diff options
Diffstat (limited to 'arch/mips/momentum/ocelot_g/gt-irq.c')
| -rw-r--r-- | arch/mips/momentum/ocelot_g/gt-irq.c | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/arch/mips/momentum/ocelot_g/gt-irq.c b/arch/mips/momentum/ocelot_g/gt-irq.c deleted file mode 100644 index e5576bd50fa..00000000000 --- a/arch/mips/momentum/ocelot_g/gt-irq.c +++ /dev/null @@ -1,212 +0,0 @@ -/* - * - * Copyright 2002 Momentum Computer - * Author: mdharm@momenco.com - * - * arch/mips/momentum/ocelot_g/gt_irq.c - * Interrupt routines for gt64240. Currently it only handles timer irq. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - */ -#include <linux/module.h> -#include <linux/interrupt.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/kernel_stat.h> -#include <asm/gt64240.h> -#include <asm/io.h> - -unsigned long bus_clock; - -/* - * These are interrupt handlers for the GT on-chip interrupts. They - * all come in to the MIPS on a single interrupt line, and have to - * be handled and ack'ed differently than other MIPS interrupts. - */ - -#if 0 - -struct tq_struct irq_handlers[MAX_CAUSE_REGS][MAX_CAUSE_REG_WIDTH]; -void hook_irq_handler(int int_cause, int bit_num, void *isr_ptr); - -/* - * Hooks IRQ handler to the system. When the system is interrupted - * the interrupt service routine is called. - * - * Inputs : - * int_cause - The interrupt cause number. In EVB64120 two parameters - * are declared, INT_CAUSE_MAIN and INT_CAUSE_HIGH. - * bit_num - Indicates which bit number in the cause register - * isr_ptr - Pointer to the interrupt service routine - */ -void hook_irq_handler(int int_cause, int bit_num, void *isr_ptr) -{ - irq_handlers[int_cause][bit_num].routine = isr_ptr; -} - - -/* - * Enables the IRQ on Galileo Chip - * - * Inputs : - * int_cause - The interrupt cause number. In EVB64120 two parameters - * are declared, INT_CAUSE_MAIN and INT_CAUSE_HIGH. - * bit_num - Indicates which bit number in the cause register - * - * Outputs : - * 1 if successful, 0 if failure - */ -int enable_galileo_irq(int int_cause, int bit_num) -{ - if (int_cause == INT_CAUSE_MAIN) - SET_REG_BITS(CPU_INTERRUPT_MASK_REGISTER, (1 << bit_num)); - else if (int_cause == INT_CAUSE_HIGH) - SET_REG_BITS(CPU_HIGH_INTERRUPT_MASK_REGISTER, - (1 << bit_num)); - else - return 0; - - return 1; -} - -/* - * Disables the IRQ on Galileo Chip - * - * Inputs : - * int_cause - The interrupt cause number. In EVB64120 two parameters - * are declared, INT_CAUSE_MAIN and INT_CAUSE_HIGH. - * bit_num - Indicates which bit number in the cause register - * - * Outputs : - * 1 if successful, 0 if failure - */ -int disable_galileo_irq(int int_cause, int bit_num) -{ - if (int_cause == INT_CAUSE_MAIN) - RESET_REG_BITS(CPU_INTERRUPT_MASK_REGISTER, - (1 << bit_num)); - else if (int_cause == INT_CAUSE_HIGH) - RESET_REG_BITS(CPU_HIGH_INTERRUPT_MASK_REGISTER, - (1 << bit_num)); - else - return 0; - return 1; -} -#endif /* 0 */ - -/* - * Interrupt handler for interrupts coming from the Galileo chip via P0_INT#. - * - * We route the timer interrupt to P0_INT# (IRQ 6), and that's all this - * routine can handle, for now. - * - * In the future, we'll route more interrupts to this pin, and that's why - * we keep this particular structure in the function. - */ - -static irqreturn_t gt64240_p0int_irq(int irq, void *dev) -{ - uint32_t irq_src, irq_src_mask; - int handled; - - /* get the low interrupt cause register */ - irq_src = MV_READ(LOW_INTERRUPT_CAUSE_REGISTER); - - /* get the mask register for this pin */ - irq_src_mask = MV_READ(PCI_0INTERRUPT_CAUSE_MASK_REGISTER_LOW); - - /* mask off only the interrupts we're interested in */ - irq_src = irq_src & irq_src_mask; - - handled = IRQ_NONE; - - /* Check for timer interrupt */ - if (irq_src & 0x00000100) { - handled = IRQ_HANDLED; - irq_src &= ~0x00000100; - - /* Clear any pending cause bits */ - MV_WRITE(TIMER_COUNTER_0_3_INTERRUPT_CAUSE, 0x0); - - /* handle the timer call */ - do_timer(1); -#ifndef CONFIG_SMP - update_process_times(user_mode(get_irq_regs())); -#endif - } - - if (irq_src) { - printk(KERN_INFO - "UNKNOWN P0_INT# interrupt received, irq_src=0x%x\n", - irq_src); - } - - return handled; -} - -/* - * Initializes timer using galileo's built in timer. - */ - -/* - * This will ignore the standard MIPS timer interrupt handler - * that is passed in as *irq (=irq0 in ../kernel/time.c). - * We will do our own timer interrupt handling. - */ -void gt64240_time_init(void) -{ - static struct irqaction timer; - - /* Stop the timer -- we'll use timer #0 */ - MV_WRITE(TIMER_COUNTER_0_3_CONTROL, 0x0); - - /* Load timer value for 100 Hz */ - MV_WRITE(TIMER_COUNTER0, bus_clock / 100); - - /* - * Create the IRQ structure entry for the timer. Since we're too early - * in the boot process to use the "request_irq()" call, we'll hard-code - * the values to the correct interrupt line. - */ - timer.handler = >64240_p0int_irq; - timer.flags = IRQF_SHARED | IRQF_DISABLED; - timer.name = "timer"; - timer.dev_id = NULL; - timer.next = NULL; - timer.mask = CPU_MASK_NONE; - irq_desc[6].action = &timer; - - enable_irq(6); - - /* Clear any pending cause bits */ - MV_WRITE(TIMER_COUNTER_0_3_INTERRUPT_CAUSE, 0x0); - - /* Enable the interrupt for timer 0 */ - MV_WRITE(TIMER_COUNTER_0_3_INTERRUPT_MASK, 0x1); - - /* Enable the timer interrupt for GT-64240 pin P0_INT# */ - MV_WRITE (PCI_0INTERRUPT_CAUSE_MASK_REGISTER_LOW, 0x100); - - /* Configure and start the timer */ - MV_WRITE(TIMER_COUNTER_0_3_CONTROL, 0x3); -} - -void gt64240_irq_init(void) -{ -#if 0 - int i, j; - - /* Reset irq handlers pointers to NULL */ - for (i = 0; i < MAX_CAUSE_REGS; i++) { - for (j = 0; j < MAX_CAUSE_REG_WIDTH; j++) { - irq_handlers[i][j].next = NULL; - irq_handlers[i][j].sync = 0; - irq_handlers[i][j].routine = NULL; - irq_handlers[i][j].data = NULL; - } - } -#endif /* 0 */ -} |