From 6f57bbf48cc42056a53495990f6770c3de1f4480 Mon Sep 17 00:00:00 2001 From: Artyom Tarasenko Date: Mon, 15 Feb 2010 18:39:50 +0100 Subject: sparc32 fix spurious dma interrupts v2 Don't raise irq when not enabled. Raise irq on enabling if DMA_INTR is set Don't clear irq unless it was raised by DMA, as there are other irq sources Don't set DMA_INTR bit spuriously. v1->v2: - Don't clear irq unless it was raised by DMA - Raise irq on enabling if DMA_INTR is set - Assume revertion of 787cfbc432bf1d353a77cbdb613754f3963371a3 Signed-off-by: Artyom Tarasenko Signed-off-by: Blue Swirl --- hw/sparc32_dma.c | 34 ++++++++++++++++++++++++---------- 1 file changed, 24 insertions(+), 10 deletions(-) (limited to 'hw') diff --git a/hw/sparc32_dma.c b/hw/sparc32_dma.c index faf6dbc..3ceb851 100644 --- a/hw/sparc32_dma.c +++ b/hw/sparc32_dma.c @@ -3,6 +3,9 @@ * * Copyright (c) 2006 Fabrice Bellard * + * Modifications: + * 2010-Feb-14 Artyom Tarasenko : reworked irq generation + * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights @@ -125,13 +128,19 @@ static void dma_set_irq(void *opaque, int irq, int level) { DMAState *s = opaque; if (level) { - DPRINTF("Raise IRQ\n"); s->dmaregs[0] |= DMA_INTR; - qemu_irq_raise(s->irq); + if (s->dmaregs[0] & DMA_INTREN) { + DPRINTF("Raise IRQ\n"); + qemu_irq_raise(s->irq); + } } else { - s->dmaregs[0] &= ~DMA_INTR; - DPRINTF("Lower IRQ\n"); - qemu_irq_lower(s->irq); + if (s->dmaregs[0] & DMA_INTR) { + s->dmaregs[0] &= ~DMA_INTR; + if (s->dmaregs[0] & DMA_INTREN) { + DPRINTF("Lower IRQ\n"); + qemu_irq_lower(s->irq); + } + } } } @@ -142,7 +151,6 @@ void espdma_memory_read(void *opaque, uint8_t *buf, int len) DPRINTF("DMA read, direction: %c, addr 0x%8.8x\n", s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]); sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len); - s->dmaregs[0] |= DMA_INTR; s->dmaregs[1] += len; } @@ -153,7 +161,6 @@ void espdma_memory_write(void *opaque, uint8_t *buf, int len) DPRINTF("DMA write, direction: %c, addr 0x%8.8x\n", s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]); sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len); - s->dmaregs[0] |= DMA_INTR; s->dmaregs[1] += len; } @@ -179,9 +186,16 @@ static void dma_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val) s->dmaregs[saddr], val); switch (saddr) { case 0: - if (!(val & DMA_INTREN)) { - DPRINTF("Lower IRQ\n"); - qemu_irq_lower(s->irq); + if (val & DMA_INTREN) { + if (val & DMA_INTR) { + DPRINTF("Raise IRQ\n"); + qemu_irq_raise(s->irq); + } + } else { + if (s->dmaregs[0] & (DMA_INTR | DMA_INTREN)) { + DPRINTF("Lower IRQ\n"); + qemu_irq_lower(s->irq); + } } if (val & DMA_RESET) { qemu_irq_raise(s->dev_reset); -- cgit v1.1