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