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| -rw-r--r-- | cpu/74xx_7xx/interrupts.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/cpu/74xx_7xx/interrupts.c b/cpu/74xx_7xx/interrupts.c new file mode 100644 index 0000000..10450da --- /dev/null +++ b/cpu/74xx_7xx/interrupts.c @@ -0,0 +1,204 @@ +/* + * (C) Copyright 2001 + * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* + * interrupts.c - just enough support for the decrementer/timer + */ + +#include <common.h> +#include <mpc8xx.h> +#include <mpc8xx_irq.h> +#include <asm/processor.h> +#include <commproc.h> +#include <command.h> + +/****************************************************************************/ + +unsigned decrementer_count; /* count value for 1e6/HZ microseconds */ + +/****************************************************************************/ + +static __inline__ unsigned long +get_msr(void) +{ + unsigned long msr; + + asm volatile("mfmsr %0" : "=r" (msr) :); + return msr; +} + +static __inline__ void +set_msr(unsigned long msr) +{ + asm volatile("mtmsr %0" : : "r" (msr)); +} + +static __inline__ unsigned long +get_dec(void) +{ + unsigned long val; + + asm volatile("mfdec %0" : "=r" (val) :); + return val; +} + + +static __inline__ void +set_dec(unsigned long val) +{ + asm volatile("mtdec %0" : : "r" (val)); +} + + +void +enable_interrupts(void) +{ + set_msr (get_msr() | MSR_EE); +} + +/* returns flag if MSR_EE was set before */ +int +disable_interrupts(void) +{ + ulong msr = get_msr(); + set_msr (msr & ~MSR_EE); + return ((msr & MSR_EE) != 0); +} + +/****************************************************************************/ + +int interrupt_init(void) +{ +#ifdef DEBUG + printf("interrupt_init: GT main cause reg: %08x:%08x\n", + GTREGREAD(LOW_INTERRUPT_CAUSE_REGISTER), + GTREGREAD(HIGH_INTERRUPT_CAUSE_REGISTER)); + printf("interrupt_init: ethernet cause regs: %08x %08x %08x\n", + GTREGREAD(ETHERNET0_INTERRUPT_CAUSE_REGISTER), + GTREGREAD(ETHERNET1_INTERRUPT_CAUSE_REGISTER), + GTREGREAD(ETHERNET2_INTERRUPT_CAUSE_REGISTER)); + printf("interrupt_init: ethernet mask regs: %08x %08x %08x\n", + GTREGREAD(ETHERNET0_INTERRUPT_MASK_REGISTER), + GTREGREAD(ETHERNET1_INTERRUPT_MASK_REGISTER), + GTREGREAD(ETHERNET2_INTERRUPT_MASK_REGISTER)); + puts("interrupt_init: setting decrementer_count\n"); +#endif + decrementer_count = get_tbclk() / CFG_HZ; + +#ifdef DEBUG + puts("interrupt_init: setting actual decremter\n"); +#endif + set_dec (get_tbclk() / CFG_HZ); + +#ifdef DEBUG + printf("interrupt_init: enabling interrupts (msr = %08lx)\n", + get_msr()); +#endif + set_msr (get_msr() | MSR_EE); + +#ifdef DEBUG + printf("interrupt_init: done. (msr = %08lx)\n", get_msr()); +#endif + return (0); +} + +/****************************************************************************/ + +/* + * Handle external interrupts + */ +void +external_interrupt(struct pt_regs *regs) +{ + puts("external_interrupt (oops!)\n"); +} + +volatile ulong timestamp = 0; + +/* + * timer_interrupt - gets called when the decrementer overflows, + * with interrupts disabled. + * Trivial implementation - no need to be really accurate. + */ +void +timer_interrupt(struct pt_regs *regs) +{ + set_dec(decrementer_count); + timestamp++; + +#if defined(CONFIG_WATCHDOG) + if ((timestamp % (CFG_HZ / 2)) == 0) { +#if defined(CONFIG_PCIPPC2) + extern void pcippc2_wdt_reset (void); + + pcippc2_wdt_reset(); +#endif + } +#endif /* CONFIG_WATCHDOG */ +} + +/****************************************************************************/ + +void +reset_timer(void) +{ + timestamp = 0; +} + +ulong +get_timer(ulong base) +{ + return (timestamp - base); +} + +void +set_timer(ulong t) +{ + timestamp = t; +} + +/****************************************************************************/ + +/* + * Install and free a interrupt handler. + */ + +void +irq_install_handler(int vec, interrupt_handler_t *handler, void *arg) +{ + +} + +void +irq_free_handler(int vec) +{ + +} + +/****************************************************************************/ + +void +do_irqinfo(cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[]) +{ + puts("IRQ related functions are unimplemented currently.\n"); +} |