root / hw / etraxfs_pic.c @ 487414f1
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/*
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* QEMU ETRAX Interrupt Controller.
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*
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* Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h> |
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#include "hw.h" |
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#include "etraxfs.h" |
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#define D(x)
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struct fs_pic_state_t
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{ |
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CPUState *env; |
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uint32_t rw_mask; |
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/* Active interrupt lines. */
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uint32_t r_vect; |
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/* Active lines, gated through the mask. */
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uint32_t r_masked_vect; |
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uint32_t r_nmi; |
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uint32_t r_guru; |
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}; |
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static void pic_update(struct fs_pic_state_t *fs) |
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{ |
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CPUState *env = fs->env; |
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int i;
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uint32_t vector = 0;
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fs->r_masked_vect = fs->r_vect & fs->rw_mask; |
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/* The ETRAX interrupt controller signals interrupts to teh core
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through an interrupt request wire and an irq vector bus. If
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multiple interrupts are simultaneously active it chooses vector
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0x30 and lets the sw choose the priorities. */
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if (fs->r_masked_vect) {
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uint32_t mv = fs->r_masked_vect; |
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for (i = 0; i < 31; i++) { |
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if (mv & 1) { |
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vector = 0x31 + i;
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/* Check for multiple interrupts. */
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if (mv > 1) |
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vector = 0x30;
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break;
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} |
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mv >>= 1;
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} |
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if (vector) {
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env->interrupt_vector = vector; |
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D(printf("%s vector=%x\n", __func__, vector));
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cpu_interrupt(env, CPU_INTERRUPT_HARD); |
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} |
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} else {
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env->interrupt_vector = 0;
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cpu_reset_interrupt(env, CPU_INTERRUPT_HARD); |
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D(printf("%s reset irqs\n", __func__));
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} |
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} |
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static uint32_t pic_readl (void *opaque, target_phys_addr_t addr) |
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{ |
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struct fs_pic_state_t *fs = opaque;
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uint32_t rval; |
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switch (addr)
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{ |
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case 0x0: |
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rval = fs->rw_mask; |
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break;
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case 0x4: |
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rval = fs->r_vect; |
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break;
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case 0x8: |
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rval = fs->r_masked_vect; |
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break;
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case 0xc: |
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rval = fs->r_nmi; |
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break;
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case 0x10: |
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rval = fs->r_guru; |
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break;
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default:
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cpu_abort(fs->env, "invalid PIC register.\n");
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break;
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} |
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D(printf("%s %x=%x\n", __func__, addr, rval));
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return rval;
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} |
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static void |
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pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
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{ |
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struct fs_pic_state_t *fs = opaque;
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D(printf("%s addr=%x val=%x\n", __func__, addr, value));
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switch (addr)
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{ |
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case 0x0: |
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fs->rw_mask = value; |
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pic_update(fs); |
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break;
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default:
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cpu_abort(fs->env, "invalid PIC register.\n");
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break;
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} |
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} |
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static CPUReadMemoryFunc *pic_read[] = {
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NULL, NULL, |
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&pic_readl, |
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}; |
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static CPUWriteMemoryFunc *pic_write[] = {
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NULL, NULL, |
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&pic_writel, |
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}; |
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void pic_info(void) |
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{ |
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} |
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void irq_info(void) |
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{ |
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} |
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static void irq_handler(void *opaque, int irq, int level) |
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{ |
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struct fs_pic_state_t *fs = (void *)opaque; |
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D(printf("%s irq=%d level=%d mask=%x v=%x mv=%x\n",
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__func__, irq, level, |
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fs->rw_mask, fs->r_vect, fs->r_masked_vect)); |
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irq -= 1;
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fs->r_vect &= ~(1 << irq);
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fs->r_vect |= (!!level << irq); |
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pic_update(fs); |
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} |
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static void nmi_handler(void *opaque, int irq, int level) |
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{ |
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struct fs_pic_state_t *fs = (void *)opaque; |
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CPUState *env = fs->env; |
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uint32_t mask; |
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mask = 1 << irq;
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if (level)
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fs->r_nmi |= mask; |
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else
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fs->r_nmi &= ~mask; |
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if (fs->r_nmi)
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cpu_interrupt(env, CPU_INTERRUPT_NMI); |
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else
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cpu_reset_interrupt(env, CPU_INTERRUPT_NMI); |
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} |
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static void guru_handler(void *opaque, int irq, int level) |
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{ |
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struct fs_pic_state_t *fs = (void *)opaque; |
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CPUState *env = fs->env; |
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cpu_abort(env, "%s unsupported exception\n", __func__);
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} |
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struct etraxfs_pic *etraxfs_pic_init(CPUState *env, target_phys_addr_t base)
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{ |
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struct fs_pic_state_t *fs = NULL; |
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struct etraxfs_pic *pic = NULL; |
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int intr_vect_regs;
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pic = qemu_mallocz(sizeof *pic);
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pic->internal = fs = qemu_mallocz(sizeof *fs);
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fs->env = env; |
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pic->irq = qemu_allocate_irqs(irq_handler, fs, 30);
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pic->nmi = qemu_allocate_irqs(nmi_handler, fs, 2);
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pic->guru = qemu_allocate_irqs(guru_handler, fs, 1);
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intr_vect_regs = cpu_register_io_memory(0, pic_read, pic_write, fs);
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cpu_register_physical_memory(base, 0x14, intr_vect_regs);
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return pic;
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} |