diff options
Diffstat (limited to 'arch/microblaze/cpu/interrupts.c')
| -rw-r--r-- | arch/microblaze/cpu/interrupts.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/arch/microblaze/cpu/interrupts.c b/arch/microblaze/cpu/interrupts.c new file mode 100644 index 0000000..7f2ee64 --- /dev/null +++ b/arch/microblaze/cpu/interrupts.c @@ -0,0 +1,218 @@ +/* + * (C) Copyright 2007 Michal Simek + * (C) Copyright 2004 Atmark Techno, Inc. + * + * Michal SIMEK <monstr@monstr.eu> + * Yasushi SHOJI <yashi@atmark-techno.com> + * + * 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 + */ + +#include <common.h> +#include <command.h> +#include <malloc.h> +#include <asm/microblaze_intc.h> +#include <asm/asm.h> + +#undef DEBUG_INT + +void enable_interrupts(void) +{ + MSRSET(0x2); +} + +int disable_interrupts(void) +{ + unsigned int msr; + + MFS(msr, rmsr); + MSRCLR(0x2); + return (msr & 0x2) != 0; +} + +static struct irq_action *vecs; +static u32 irq_no; + +/* mapping structure to interrupt controller */ +microblaze_intc_t *intc; + +/* default handler */ +static void def_hdlr(void) +{ + puts("def_hdlr\n"); +} + +static void enable_one_interrupt(int irq) +{ + int mask; + int offset = 1; + + offset <<= irq; + mask = intc->ier; + intc->ier = (mask | offset); +#ifdef DEBUG_INT + printf("Enable one interrupt irq %x - mask %x,ier %x\n", offset, mask, + intc->ier); + printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier, + intc->iar, intc->mer); +#endif +} + +static void disable_one_interrupt(int irq) +{ + int mask; + int offset = 1; + + offset <<= irq; + mask = intc->ier; + intc->ier = (mask & ~offset); +#ifdef DEBUG_INT + printf("Disable one interrupt irq %x - mask %x,ier %x\n", irq, mask, + intc->ier); + printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier, + intc->iar, intc->mer); +#endif +} + +int install_interrupt_handler(int irq, interrupt_handler_t *hdlr, void *arg) +{ + struct irq_action *act; + + /* irq out of range */ + if ((irq < 0) || (irq > irq_no)) { + puts("IRQ out of range\n"); + return -1; + } + act = &vecs[irq]; + if (hdlr) { /* enable */ + act->handler = hdlr; + act->arg = arg; + act->count = 0; + enable_one_interrupt (irq); + return 0; + } + + /* Disable */ + act->handler = (interrupt_handler_t *) def_hdlr; + act->arg = (void *)irq; + disable_one_interrupt(irq); + return 1; +} + +/* initialization interrupt controller - hardware */ +static void intc_init(void) +{ + intc->mer = 0; + intc->ier = 0; + intc->iar = 0xFFFFFFFF; + /* XIntc_Start - hw_interrupt enable and all interrupt enable */ + intc->mer = 0x3; +#ifdef DEBUG_INT + printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier, + intc->iar, intc->mer); +#endif +} + +int interrupts_init(void) +{ + int i; + +#if defined(CONFIG_SYS_INTC_0_ADDR) && defined(CONFIG_SYS_INTC_0_NUM) + intc = (microblaze_intc_t *) (CONFIG_SYS_INTC_0_ADDR); + irq_no = CONFIG_SYS_INTC_0_NUM; +#endif + if (irq_no) { + vecs = calloc(1, sizeof(struct irq_action) * irq_no); + if (vecs == NULL) { + puts("Interrupt vector allocation failed\n"); + return -1; + } + + /* initialize irq list */ + for (i = 0; i < irq_no; i++) { + vecs[i].handler = (interrupt_handler_t *) def_hdlr; + vecs[i].arg = (void *)i; + vecs[i].count = 0; + } + /* initialize intc controller */ + intc_init(); + enable_interrupts(); + } else { + puts("Undefined interrupt controller\n"); + } + return 0; +} + +void interrupt_handler(void) +{ + int irqs = intc->ivr; /* find active interrupt */ + int mask = 1; +#ifdef DEBUG_INT + int value; + printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier, + intc->iar, intc->mer); + R14(value); + printf ("Interrupt handler on %x line, r14 %x\n", irqs, value); +#endif + struct irq_action *act = vecs + irqs; + +#ifdef DEBUG_INT + printf + ("Jumping to interrupt handler rutine addr %x,count %x,arg %x\n", + act->handler, act->count, act->arg); +#endif + act->handler (act->arg); + act->count++; + + intc->iar = mask << irqs; + +#ifdef DEBUG_INT + printf ("Dump INTC reg, isr %x, ier %x, iar %x, mer %x\n", intc->isr, + intc->ier, intc->iar, intc->mer); + R14(value); + printf ("Interrupt handler on %x line, r14 %x\n", irqs, value); +#endif +} + +#if defined(CONFIG_CMD_IRQ) +int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, const char *argv[]) +{ + int i; + struct irq_action *act = vecs; + + if (irq_no) { + puts("\nInterrupt-Information:\n\n" + "Nr Routine Arg Count\n" + "-----------------------------\n"); + + for (i = 0; i < irq_no; i++) { + if (act->handler != (interrupt_handler_t *) def_hdlr) { + printf("%02d %08x %08x %d\n", i, + (int)act->handler, (int)act->arg, + act->count); + } + act++; + } + puts("\n"); + } else { + puts("Undefined interrupt controller\n"); + } + return 0; +} +#endif |
