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Subject[PATCH 65/71] atari_scsi, sun3_scsi: Remove global Scsi_Host pointer
This refactoring removes two global Scsi_Host pointers. This
improves consistency with other ncr5380 drivers. Adopting the same
conventions as the other drivers makes them easier to read.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>

---
drivers/scsi/atari_NCR5380.c | 5 +-
drivers/scsi/atari_scsi.c | 29 ++++++++---------
drivers/scsi/sun3_scsi.c | 72 ++++++++++---------------------------------
3 files changed, 36 insertions(+), 70 deletions(-)

Index: linux/drivers/scsi/atari_scsi.c
===================================================================
--- linux.orig/drivers/scsi/atari_scsi.c 2015-11-18 19:34:20.000000000 +1100
+++ linux/drivers/scsi/atari_scsi.c 2015-11-18 19:34:34.000000000 +1100
@@ -159,14 +159,10 @@ static inline unsigned long SCSI_DMA_GET
return adr;
}

-#define HOSTDATA_DMALEN (((struct NCR5380_hostdata *) \
- (atari_scsi_host->hostdata))->dma_len)
-
#ifdef REAL_DMA
static void atari_scsi_fetch_restbytes(void);
#endif

-static struct Scsi_Host *atari_scsi_host;
static unsigned char (*atari_scsi_reg_read)(unsigned char reg);
static void (*atari_scsi_reg_write)(unsigned char reg, unsigned char value);

@@ -262,15 +258,17 @@ static void scsi_dma_buserr(int irq, voi
#endif


-static irqreturn_t scsi_tt_intr(int irq, void *dummy)
+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;

dma_stat = tt_scsi_dma.dma_ctrl;

- dprintk(NDEBUG_INTR, "scsi%d: NCR5380 interrupt, DMA status = %02x\n",
- atari_scsi_host->host_no, dma_stat & 0xff);
+ dsprintk(NDEBUG_INTR, instance, "NCR5380 interrupt, DMA status = %02x\n",
+ dma_stat & 0xff);

/* Look if it was the DMA that has interrupted: First possibility
* is that a bus error occurred...
@@ -293,7 +291,8 @@ static irqreturn_t scsi_tt_intr(int irq,
* data reg!
*/
if ((dma_stat & 0x02) && !(dma_stat & 0x40)) {
- atari_dma_residual = HOSTDATA_DMALEN - (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr);
+ atari_dma_residual = hostdata->dma_len -
+ (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr);

dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n",
atari_dma_residual);
@@ -345,15 +344,17 @@ static irqreturn_t scsi_tt_intr(int irq,

#endif /* REAL_DMA */

- NCR5380_intr(irq, dummy);
+ NCR5380_intr(irq, dev);

return IRQ_HANDLED;
}


-static irqreturn_t scsi_falcon_intr(int irq, void *dummy)
+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;

/* Turn off DMA and select sector counter register before
@@ -388,7 +389,7 @@ static irqreturn_t scsi_falcon_intr(int
printk(KERN_ERR "SCSI DMA error: %ld bytes lost in "
"ST-DMA fifo\n", transferred & 15);

- atari_dma_residual = HOSTDATA_DMALEN - transferred;
+ atari_dma_residual = hostdata->dma_len - transferred;
dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n",
atari_dma_residual);
} else
@@ -400,13 +401,14 @@ static irqreturn_t scsi_falcon_intr(int
* data to the original destination address.
*/
memcpy(atari_dma_orig_addr, phys_to_virt(atari_dma_startaddr),
- HOSTDATA_DMALEN - atari_dma_residual);
+ hostdata->dma_len - atari_dma_residual);
atari_dma_orig_addr = NULL;
}

#endif /* REAL_DMA */

- NCR5380_intr(irq, dummy);
+ NCR5380_intr(irq, dev);
+
return IRQ_HANDLED;
}

@@ -873,7 +875,6 @@ static int __init atari_scsi_probe(struc
error = -ENOMEM;
goto fail_alloc;
}
- atari_scsi_host = instance;

instance->irq = irq->start;

Index: linux/drivers/scsi/sun3_scsi.c
===================================================================
--- linux.orig/drivers/scsi/sun3_scsi.c 2015-11-18 19:34:20.000000000 +1100
+++ linux/drivers/scsi/sun3_scsi.c 2015-11-18 19:34:34.000000000 +1100
@@ -56,9 +56,9 @@
#define NCR5380_info sun3scsi_info

#define NCR5380_dma_read_setup(instance, data, count) \
- sun3scsi_dma_setup(data, count, 0)
+ sun3scsi_dma_setup(instance, data, count, 0)
#define NCR5380_dma_write_setup(instance, data, count) \
- sun3scsi_dma_setup(data, count, 1)
+ sun3scsi_dma_setup(instance, data, count, 1)
#define NCR5380_dma_residual(instance) \
sun3scsi_dma_residual(instance)
#define NCR5380_dma_xfer_len(instance, cmd, phase) \
@@ -99,7 +99,6 @@ static unsigned char *sun3_dma_orig_addr
static unsigned long sun3_dma_orig_count;
static int sun3_dma_active;
static unsigned long last_residual;
-static struct Scsi_Host *default_instance;

/*
* NCR 5380 register access functions
@@ -142,8 +141,9 @@ static inline void sun3_udc_write(unsign
// safe bits for the CSR
#define CSR_GOOD 0x060f

-static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
+static irqreturn_t scsi_sun3_intr(int irq, void *dev)
{
+ struct Scsi_Host *instance = dev;
unsigned short csr = dregs->csr;
int handled = 0;

@@ -152,46 +152,24 @@ static irqreturn_t scsi_sun3_intr(int ir
#endif

if(csr & ~CSR_GOOD) {
- if(csr & CSR_DMA_BUSERR) {
- printk("scsi%d: bus error in dma\n", default_instance->host_no);
- }
-
- if(csr & CSR_DMA_CONFLICT) {
- printk("scsi%d: dma conflict\n", default_instance->host_no);
- }
+ if (csr & CSR_DMA_BUSERR)
+ shost_printk(KERN_ERR, instance, "bus error in DMA\n");
+ if (csr & CSR_DMA_CONFLICT)
+ shost_printk(KERN_ERR, instance, "DMA conflict\n");
handled = 1;
}

if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
- NCR5380_intr(irq, dummy);
+ NCR5380_intr(irq, dev);
handled = 1;
}

return IRQ_RETVAL(handled);
}

-/*
- * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
- * reentering NCR5380_print_status seems to have ugly side effects
- */
-
-/* this doesn't seem to get used at all -- sam */
-#if 0
-void sun3_sun3_debug (void)
-{
- unsigned long flags;
-
- if (default_instance) {
- local_irq_save(flags);
- NCR5380_print_status(default_instance);
- local_irq_restore(flags);
- }
-}
-#endif
-
-
/* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
-static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
+static unsigned long sun3scsi_dma_setup(struct Scsi_Host *instance,
+ void *data, unsigned long count, int write_flag)
{
void *addr;

@@ -243,10 +221,9 @@ static unsigned long sun3scsi_dma_setup(
dregs->csr |= CSR_FIFO;

if(dregs->fifo_count != count) {
- printk("scsi%d: fifo_mismatch %04x not %04x\n",
- default_instance->host_no, dregs->fifo_count,
- (unsigned int) count);
- NCR5380_dprint(NDEBUG_DMA, default_instance);
+ shost_printk(KERN_ERR, instance, "FIFO mismatch %04x not %04x\n",
+ dregs->fifo_count, (unsigned int) count);
+ NCR5380_dprint(NDEBUG_DMA, instance);
}

/* setup udc */
@@ -281,21 +258,6 @@ static unsigned long sun3scsi_dma_setup(

}

-#ifndef SUN3_SCSI_VME
-static inline unsigned long sun3scsi_dma_count(struct Scsi_Host *instance)
-{
- unsigned short resid;
-
- dregs->udc_addr = 0x32;
- udelay(SUN3_DMA_DELAY);
- resid = dregs->udc_data;
- udelay(SUN3_DMA_DELAY);
- resid *= 2;
-
- return (unsigned long) resid;
-}
-#endif
-
static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
{
return last_residual;
@@ -393,7 +355,10 @@ static int sun3scsi_dma_finish(int write
}
}

- count = sun3scsi_dma_count(default_instance);
+ dregs->udc_addr = 0x32;
+ udelay(SUN3_DMA_DELAY);
+ count = 2 * dregs->udc_data;
+ udelay(SUN3_DMA_DELAY);

fifo = dregs->fifo_count;
last_residual = fifo;
@@ -547,7 +512,6 @@ static int __init sun3_scsi_probe(struct
error = -ENOMEM;
goto fail_alloc;
}
- default_instance = instance;

instance->io_port = (unsigned long)ioaddr;
instance->irq = irq->start;
Index: linux/drivers/scsi/atari_NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/atari_NCR5380.c 2015-11-18 19:34:33.000000000 +1100
+++ linux/drivers/scsi/atari_NCR5380.c 2015-11-18 19:34:34.000000000 +1100
@@ -1929,7 +1929,7 @@ static void NCR5380_information_transfer
/* this command setup for dma yet? */
if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) {
if (cmd->request->cmd_type == REQ_TYPE_FS) {
- sun3scsi_dma_setup(d, count,
+ sun3scsi_dma_setup(instance, d, count,
rq_data_dir(cmd->request));
sun3_dma_setup_done = cmd;
}
@@ -2467,7 +2467,8 @@ static void NCR5380_reselect(struct Scsi
}
/* setup this command for dma if not already */
if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) {
- sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
+ sun3scsi_dma_setup(instance, d, count,
+ rq_data_dir(tmp->request));
sun3_dma_setup_done = tmp;
}
}



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