diff options
| -rw-r--r-- | src/hw/esp-scsi.c | 36 |
1 files changed, 22 insertions, 14 deletions
diff --git a/src/hw/esp-scsi.c b/src/hw/esp-scsi.c index 06ef20d..b8631ea6 100644 --- a/src/hw/esp-scsi.c +++ b/src/hw/esp-scsi.c @@ -57,6 +57,8 @@ #define ESP_STAT_MSG 0x04 #define ESP_STAT_TC 0x10 +#define ESP_INTR_FC 0x08 +#define ESP_INTR_BS 0x10 #define ESP_INTR_DC 0x20 struct esp_lun_s { @@ -97,8 +99,9 @@ esp_scsi_process_op(struct disk_op_s *op) outb(target, iobase + ESP_WBUSID); - /* Clear FIFO before sending command. */ + /* Clear FIFO and interrupts before sending command. */ outb(ESP_CMD_FLUSH, iobase + ESP_CMD); + inb(iobase + ESP_RINTR); /* * We need to pass the LUN at the beginning of the command, and the FIFO @@ -115,21 +118,26 @@ esp_scsi_process_op(struct disk_op_s *op) for (state = 0;;) { u8 stat = inb(iobase + ESP_RSTAT); + u8 intr; - /* Detect disconnected device. */ - if (state == 0 && (inb(iobase + ESP_RINTR) & ESP_INTR_DC)) { - return DISK_RET_ENOTREADY; - } + if (state == 0) { + intr = inb(iobase + ESP_RINTR); - /* HBA reads command, clears CD, sets TC -> do DMA if needed. */ - if (state == 0 && (stat & ESP_STAT_TC)) { - state++; - if (op->count && blocksize) { - /* Data phase. */ - u32 count = (u32)op->count * blocksize; - esp_scsi_dma(iobase, (u32)op->buf_fl, count, scsi_is_read(op)); - outb(ESP_CMD_TI | ESP_CMD_DMA, iobase + ESP_CMD); - continue; + /* Detect disconnected device. */ + if (intr & ESP_INTR_DC) { + return DISK_RET_ENOTREADY; + } + + /* HBA reads command, executes it, sets BS/FC -> do DMA if needed. */ + if (intr & (ESP_INTR_BS | ESP_INTR_FC)) { + state++; + if (op->count && blocksize) { + /* Data phase. */ + u32 count = (u32)op->count * blocksize; + esp_scsi_dma(iobase, (u32)op->buf_fl, count, scsi_is_read(op)); + outb(ESP_CMD_TI | ESP_CMD_DMA, iobase + ESP_CMD); + continue; + } } } |