diff options
| -rw-r--r-- | hw/scsi/esp.c | 53 |
1 files changed, 34 insertions, 19 deletions
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index d8d7ede..10e63d1 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -243,6 +243,9 @@ static uint32_t get_cmd(ESPState *s) s->dma_memory_read(s->dma_opaque, buf, dmalen); } else { set_pdma(s, TI); + if (esp_select(s) < 0) { + return -1; + } esp_raise_drq(s); return 0; } @@ -257,7 +260,7 @@ static uint32_t get_cmd(ESPState *s) trace_esp_get_cmd(dmalen, target); if (esp_select(s) < 0) { - return 0; + return -1; } return dmalen; } @@ -299,9 +302,6 @@ static void do_cmd(ESPState *s) static void satn_pdma_cb(ESPState *s) { - if (esp_select(s) < 0) { - return; - } s->do_cmd = 0; if (s->cmdlen) { do_cmd(s); @@ -310,24 +310,28 @@ static void satn_pdma_cb(ESPState *s) static void handle_satn(ESPState *s) { + int32_t cmdlen; + if (s->dma && !s->dma_enabled) { s->dma_cb = handle_satn; return; } s->pdma_cb = satn_pdma_cb; - s->cmdlen = get_cmd(s); - if (s->cmdlen) { + cmdlen = get_cmd(s); + if (cmdlen > 0) { + s->cmdlen = cmdlen; do_cmd(s); - } else { + } else if (cmdlen == 0) { + s->cmdlen = 0; s->do_cmd = 1; + /* Target present, but no cmd yet - switch to command phase */ + s->rregs[ESP_RSEQ] = SEQ_CD; + s->rregs[ESP_RSTAT] = STAT_CD; } } static void s_without_satn_pdma_cb(ESPState *s) { - if (esp_select(s) < 0) { - return; - } s->do_cmd = 0; if (s->cmdlen) { do_busid_cmd(s, s->cmdbuf, 0); @@ -336,24 +340,28 @@ static void s_without_satn_pdma_cb(ESPState *s) static void handle_s_without_atn(ESPState *s) { + int32_t cmdlen; + if (s->dma && !s->dma_enabled) { s->dma_cb = handle_s_without_atn; return; } s->pdma_cb = s_without_satn_pdma_cb; - s->cmdlen = get_cmd(s); - if (s->cmdlen) { + cmdlen = get_cmd(s); + if (cmdlen > 0) { + s->cmdlen = cmdlen; do_busid_cmd(s, s->cmdbuf, 0); - } else { + } else if (cmdlen == 0) { + s->cmdlen = 0; s->do_cmd = 1; + /* Target present, but no cmd yet - switch to command phase */ + s->rregs[ESP_RSEQ] = SEQ_CD; + s->rregs[ESP_RSTAT] = STAT_CD; } } static void satn_stop_pdma_cb(ESPState *s) { - if (esp_select(s) < 0) { - return; - } s->do_cmd = 0; if (s->cmdlen) { trace_esp_handle_satn_stop(s->cmdlen); @@ -367,21 +375,28 @@ static void satn_stop_pdma_cb(ESPState *s) static void handle_satn_stop(ESPState *s) { + int32_t cmdlen; + if (s->dma && !s->dma_enabled) { s->dma_cb = handle_satn_stop; return; } s->pdma_cb = satn_stop_pdma_cb; - s->cmdlen = get_cmd(s); - if (s->cmdlen) { + cmdlen = get_cmd(s); + if (cmdlen > 0) { trace_esp_handle_satn_stop(s->cmdlen); + s->cmdlen = cmdlen; s->do_cmd = 1; s->rregs[ESP_RSTAT] = STAT_TC | STAT_CD; s->rregs[ESP_RINTR] = INTR_BS | INTR_FC; s->rregs[ESP_RSEQ] = SEQ_CD; esp_raise_irq(s); - } else { + } else if (cmdlen == 0) { + s->cmdlen = 0; s->do_cmd = 1; + /* Target present, but no cmd yet - switch to command phase */ + s->rregs[ESP_RSEQ] = SEQ_CD; + s->rregs[ESP_RSTAT] = STAT_CD; } } |