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SPARC SCSI fixes. 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2158 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
pbrook 2006-09-17 03:20:58 +00:00
parent b8174937ed
commit 6787f5fae0
1 changed files with 31 additions and 8 deletions
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39
hw/esp.c
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@ -61,7 +61,11 @@ struct ESPState {
int cmdlen;
int do_cmd;
/* The amount of data left in the current DMA transfer. */
uint32_t dma_left;
/* The size of the current DMA transfer. Zero if no transfer is in
progress. */
uint32_t dma_counter;
uint8_t *async_buf;
uint32_t async_len;
void *dma_opaque;
@ -92,7 +96,7 @@ static int get_cmd(ESPState *s, uint8_t *buf)
uint32_t dmalen;
int target;
dmalen = s->wregs[0] | (s->wregs[1] << 8);
dmalen = s->rregs[0] | (s->rregs[1] << 8);
target = s->wregs[4] & 7;
DPRINTF("get_cmd: len %d target %d\n", dmalen, target);
if (s->dma) {
@ -137,6 +141,7 @@ static void do_cmd(ESPState *s, uint8_t *buf)
if (datalen != 0) {
s->rregs[4] = STAT_IN | STAT_TC;
s->dma_left = 0;
s->dma_counter = 0;
if (datalen > 0) {
s->rregs[4] |= STAT_DI;
scsi_read_data(s->current_dev, 0);
@ -198,6 +203,8 @@ static void esp_dma_done(ESPState *s)
s->rregs[5] = INTR_BS;
s->rregs[6] = 0;
s->rregs[7] = 0;
s->rregs[0] = 0;
s->rregs[1] = 0;
espdma_raise_irq(s->dma_opaque);
}
@ -232,17 +239,25 @@ static void esp_do_dma(ESPState *s)
s->dma_left -= len;
s->async_buf += len;
s->async_len -= len;
if (to_device)
s->ti_size += len;
else
s->ti_size -= len;
if (s->async_len == 0) {
if (to_device) {
// ti_size is negative
s->ti_size += len;
scsi_write_data(s->current_dev, 0);
} else {
s->ti_size -= len;
scsi_read_data(s->current_dev, 0);
/* If there is still data to be read from the device then
complete the DMA operation immeriately. Otherwise defer
until the scsi layer has completed. */
if (s->dma_left == 0 && s->ti_size > 0) {
esp_dma_done(s);
}
}
}
if (s->dma_left == 0) {
} else {
/* Partially filled a scsi buffer. Complete immediately. */
esp_dma_done(s);
}
}
@ -269,8 +284,13 @@ static void esp_command_complete(void *opaque, int reason, uint32_t tag,
DPRINTF("transfer %d/%d\n", s->dma_left, s->ti_size);
s->async_len = arg;
s->async_buf = scsi_get_buf(s->current_dev, 0);
if (s->dma_left)
if (s->dma_left) {
esp_do_dma(s);
} else if (s->dma_counter != 0 && s->ti_size <= 0) {
/* If this was the last part of a DMA transfer then the
completion interrupt is deferred to here. */
esp_dma_done(s);
}
}
}
@ -278,10 +298,11 @@ static void handle_ti(ESPState *s)
{
uint32_t dmalen, minlen;
dmalen = s->wregs[0] | (s->wregs[1] << 8);
dmalen = s->rregs[0] | (s->rregs[1] << 8);
if (dmalen==0) {
dmalen=0x10000;
}
s->dma_counter = dmalen;
if (s->do_cmd)
minlen = (dmalen < 32) ? dmalen : 32;
@ -366,7 +387,6 @@ static void esp_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
switch (saddr) {
case 0:
case 1:
s->rregs[saddr] = val;
s->rregs[4] &= ~STAT_TC;
break;
case 2:
@ -388,6 +408,9 @@ static void esp_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
// Command
if (val & 0x80) {
s->dma = 1;
/* Reload DMA counter. */
s->rregs[0] = s->wregs[0];
s->rregs[1] = s->wregs[1];
} else {
s->dma = 0;
}