#include <scsi/scsi_host.h>
+#define DMA_MIN_SIZE 32
+
/* Definitions for the core NCR5380 driver. */
-#define REAL_DMA
#define SUPPORT_TAGS
#define MAX_TAGS 32
-#define DMA_MIN_SIZE 32
#define NCR5380_implementation_fields /* none */
return adr;
}
-#ifdef REAL_DMA
static void atari_scsi_fetch_restbytes(void);
-#endif
static unsigned char (*atari_scsi_reg_read)(unsigned char reg);
static void (*atari_scsi_reg_write)(unsigned char reg, unsigned char value);
-#ifdef REAL_DMA
static unsigned long atari_dma_residual, atari_dma_startaddr;
static short atari_dma_active;
/* pointer to the dribble buffer */
/* mask for address bits that can't be used with the ST-DMA */
static unsigned long atari_dma_stram_mask;
#define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0)
-#endif
static int setup_can_queue = -1;
module_param(setup_can_queue, int, 0);
module_param(setup_toshiba_delay, int, 0);
-#if defined(REAL_DMA)
-
static int scsi_dma_is_ignored_buserr(unsigned char dma_stat)
{
int i;
}
#endif
-#endif
-
static irqreturn_t scsi_tt_intr(int irq, void *dev)
{
-#ifdef REAL_DMA
struct Scsi_Host *instance = dev;
struct NCR5380_hostdata *hostdata = shost_priv(instance);
int dma_stat;
tt_scsi_dma.dma_ctrl = 0;
}
-#endif /* REAL_DMA */
-
NCR5380_intr(irq, dev);
return IRQ_HANDLED;
static irqreturn_t scsi_falcon_intr(int irq, void *dev)
{
-#ifdef REAL_DMA
struct Scsi_Host *instance = dev;
struct NCR5380_hostdata *hostdata = shost_priv(instance);
int dma_stat;
atari_dma_orig_addr = NULL;
}
-#endif /* REAL_DMA */
-
NCR5380_intr(irq, dev);
return IRQ_HANDLED;
}
-#ifdef REAL_DMA
static void atari_scsi_fetch_restbytes(void)
{
int nr;
*dst++ = *src++;
}
}
-#endif /* REAL_DMA */
/* This function releases the lock on the DMA chip if there is no
#endif /* !MODULE */
-#if defined(REAL_DMA)
-
static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance,
void *data, unsigned long count,
int dir)
{
unsigned long possible_len, limit;
+ if (wanted_len < DMA_MIN_SIZE)
+ return 0;
+
if (IS_A_TT())
/* TT SCSI DMA can transfer arbitrary #bytes */
return wanted_len;
}
-#endif /* REAL_DMA */
-
-
/* NCR5380 register access functions
*
* There are separate functions for TT and Falcon, because the access
local_irq_save(flags);
-#ifdef REAL_DMA
/* Abort a maybe active DMA transfer */
if (IS_A_TT()) {
tt_scsi_dma.dma_ctrl = 0;
atari_dma_active = 0;
atari_dma_orig_addr = NULL;
}
-#endif
rv = NCR5380_bus_reset(cmd);
}
}
-
-#ifdef REAL_DMA
/* If running on a Falcon and if there's TT-Ram (i.e., more than one
* memory block, since there's always ST-Ram in a Falcon), then
* allocate a STRAM_BUFFER_SIZE byte dribble buffer for transfers
atari_dma_phys_buffer = atari_stram_to_phys(atari_dma_buffer);
atari_dma_orig_addr = 0;
}
-#endif
instance = scsi_host_alloc(&atari_scsi_template,
sizeof(struct NCR5380_hostdata));
goto fail_irq;
}
tt_mfp.active_edge |= 0x80; /* SCSI int on L->H */
-#ifdef REAL_DMA
+
tt_scsi_dma.dma_ctrl = 0;
atari_dma_residual = 0;
hostdata->read_overruns = 4;
}
-#endif
} else {
/* Nothing to do for the interrupt: the ST-DMA is initialized
* already.
*/
-#ifdef REAL_DMA
atari_dma_residual = 0;
atari_dma_active = 0;
atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000
: 0xff000000);
-#endif
}
NCR5380_maybe_reset_bus(instance);