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cmd646: synchronise DMA interrupt status with UDMA interrupt status 

Make sure that the standard DMA interrupt status bits reflect any changes made
to the UDMA interrupt status bits. The CMD646U2 datasheet claims that these
bits are equivalent, and they must be synchronised for guests that manipulate
both registers.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
master
Mark Cave-Ayland 2014-08-08 17:23:33 +01:00 committed by Stefan Hajnoczi
parent 58f16a7b47
commit 5bbc0a703d
1 changed files with 22 additions and 0 deletions
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22
hw/ide/cmd646.c
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@ -33,9 +33,13 @@
#include <hw/ide/pci.h>
/* CMD646 specific */
#define CFR 0x50
#define CFR_INTR_CH0 0x04
#define CNTRL 0x51
#define CNTRL_EN_CH0 0x04
#define CNTRL_EN_CH1 0x08
#define ARTTIM23 0x57
#define ARTTIM23_INTR_CH1 0x10
#define MRDMODE 0x71
#define MRDMODE_INTR_CH0 0x04
#define MRDMODE_INTR_CH1 0x08
@ -126,6 +130,22 @@ static void setup_cmd646_bar(PCIIDEState *d, int bus_num)
"cmd646-data", 8);
}
static void cmd646_update_dma_interrupts(PCIDevice *pd)
{
/* Sync DMA interrupt status from UDMA interrupt status */
if (pd->config[MRDMODE] & MRDMODE_INTR_CH0) {
pd->config[CFR] |= CFR_INTR_CH0;
} else {
pd->config[CFR] &= ~CFR_INTR_CH0;
}
if (pd->config[MRDMODE] & MRDMODE_INTR_CH1) {
pd->config[ARTTIM23] |= ARTTIM23_INTR_CH1;
} else {
pd->config[ARTTIM23] &= ~ARTTIM23_INTR_CH1;
}
}
static uint64_t bmdma_read(void *opaque, hwaddr addr,
unsigned size)
{
@ -184,6 +204,7 @@ static void bmdma_write(void *opaque, hwaddr addr,
case 1:
pci_dev->config[MRDMODE] =
(pci_dev->config[MRDMODE] & ~0x30) | (val & 0x30);
cmd646_update_dma_interrupts(pci_dev);
cmd646_update_irq(bm->pci_dev);
break;
case 2:
@ -249,6 +270,7 @@ static void cmd646_set_irq(void *opaque, int channel, int level)
} else {
pd->config[MRDMODE] &= ~irq_mask;
}
cmd646_update_dma_interrupts(pd);
cmd646_update_irq(d);
}