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Subject[PATCH 10/71] atari_NCR5380: Remove RESET_BOOT, CONFIG_ATARI_SCSI_TOSHIBA_DELAY and CONFIG_ATARI_SCSI_RESET_BOOT
The atari_NCR5380.c core driver now takes care of bus reset upon driver
initialization if required (same as NCR5380.c). Move the Toshiba CD-ROM
support into the core driver, enabled with a host flag, so that all
NCR5380 drivers can make use of it.

Drop the RESET_BOOT macros and the ATARI_SCSI_RESET_BOOT and
ATARI_SCSI_TOSHIBA_DELAY Kconfig symbols, which are now redundant.

Remove the atari_scsi_reset_boot(), mac_scsi_reset_boot() and
sun3_scsi_reset_boot() routines. None of this duplicated code is needed
now that all drivers can use NCR5380_maybe_reset_bus().

This brings atari_scsi, mac_scsi and sun3_scsi into line with all of the
other NCR5380 drivers.

The bus reset may raise an interrupt. That would be new behaviour for
atari_scsi only when CONFIG_ATARI_SCSI_RESET_BOOT=n. The ST DMA interrupt
is not assigned to atari_scsi at this stage, so
CONFIG_ATARI_SCSI_RESET_BOOT=y may well be problematic already.
Regardless, do_reset() now raises and clears the interrupt within
local_irq_save/restore which should avoid problems.

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

---
drivers/scsi/Kconfig | 17 -----------
drivers/scsi/NCR5380.c | 17 +++++++++--
drivers/scsi/NCR5380.h | 1
drivers/scsi/atari_NCR5380.c | 22 +++++++++-----
drivers/scsi/atari_scsi.c | 60 +++++----------------------------------
drivers/scsi/mac_scsi.c | 65 ++++++-------------------------------------
drivers/scsi/sun3_scsi.c | 47 -------------------------------
7 files changed, 51 insertions(+), 178 deletions(-)

Index: linux/drivers/scsi/Kconfig
===================================================================
--- linux.orig/drivers/scsi/Kconfig 2015-11-18 19:25:56.000000000 +1100
+++ linux/drivers/scsi/Kconfig 2015-11-18 19:33:15.000000000 +1100
@@ -1624,23 +1624,6 @@ config ATARI_SCSI
ST-DMA, replacing ACSI). It does NOT support other schemes, like
in the Hades (without DMA).

-config ATARI_SCSI_TOSHIBA_DELAY
- bool "Long delays for Toshiba CD-ROMs"
- depends on ATARI_SCSI
- help
- This option increases the delay after a SCSI arbitration to
- accommodate some flaky Toshiba CD-ROM drives. Say Y if you intend to
- use a Toshiba CD-ROM drive; otherwise, the option is not needed and
- would impact performance a bit, so say N.
-
-config ATARI_SCSI_RESET_BOOT
- bool "Reset SCSI-devices at boottime"
- depends on ATARI_SCSI
- help
- Reset the devices on your Atari whenever it boots. This makes the
- boot process fractionally longer but may assist recovery from errors
- that leave the devices with SCSI operations partway completed.
-
config MAC_SCSI
tristate "Macintosh NCR5380 SCSI"
depends on MAC && SCSI=y
Index: linux/drivers/scsi/atari_NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/atari_NCR5380.c 2015-11-18 19:33:13.000000000 +1100
+++ linux/drivers/scsi/atari_NCR5380.c 2015-11-18 19:33:15.000000000 +1100
@@ -674,13 +674,14 @@ static void prepare_info(struct Scsi_Hos
"base 0x%lx, irq %d, "
"can_queue %d, cmd_per_lun %d, "
"sg_tablesize %d, this_id %d, "
- "flags { %s}, "
+ "flags { %s%s}, "
"options { %s} ",
instance->hostt->name, instance->io_port, instance->n_io_port,
instance->base, instance->irq,
instance->can_queue, instance->cmd_per_lun,
instance->sg_tablesize, instance->this_id,
hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "",
+ hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "",
#ifdef DIFFERENTIAL
"DIFFERENTIAL "
#endif
@@ -860,6 +861,7 @@ static int __init NCR5380_init(struct Sc

static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance)
{
+ struct NCR5380_hostdata *hostdata = shost_priv(instance);
int pass;

for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
@@ -878,6 +880,14 @@ static int NCR5380_maybe_reset_bus(struc
case 4:
shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n");
do_reset(instance);
+ /* Wait after a reset; the SCSI standard calls for
+ * 250ms, we wait 500ms to be on the safe side.
+ * But some Toshiba CD-ROMs need ten times that.
+ */
+ if (hostdata->flags & FLAG_TOSHIBA_DELAY)
+ msleep(2500);
+ else
+ msleep(500);
break;
case 6:
shost_printk(KERN_ERR, instance, "bus locked solid\n");
@@ -1493,12 +1503,10 @@ static int NCR5380_select(struct Scsi_Ho
* a minimum so we'll udelay ceil(1.2)
*/

-#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
- /* ++roman: But some targets (see above :-) seem to need a bit more... */
- udelay(15);
-#else
- udelay(2);
-#endif
+ if (hostdata->flags & FLAG_TOSHIBA_DELAY)
+ udelay(15);
+ else
+ udelay(2);

if (hostdata->connected) {
NCR5380_write(MODE_REG, MR_BASE);
Index: linux/drivers/scsi/atari_scsi.c
===================================================================
--- linux.orig/drivers/scsi/atari_scsi.c 2015-11-18 19:32:58.000000000 +1100
+++ linux/drivers/scsi/atari_scsi.c 2015-11-18 19:33:15.000000000 +1100
@@ -164,15 +164,6 @@ static inline unsigned long SCSI_DMA_GET
#define HOSTDATA_DMALEN (((struct NCR5380_hostdata *) \
(atari_scsi_host->hostdata))->dma_len)

-/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
- * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
- * need ten times the standard value... */
-#ifndef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
-#define AFTER_RESET_DELAY (HZ/2)
-#else
-#define AFTER_RESET_DELAY (5*HZ/2)
-#endif
-
#ifdef REAL_DMA
static void atari_scsi_fetch_restbytes(void);
#endif
@@ -208,12 +199,12 @@ static int setup_cmd_per_lun = -1;
module_param(setup_cmd_per_lun, int, 0);
static int setup_sg_tablesize = -1;
module_param(setup_sg_tablesize, int, 0);
-#ifdef SUPPORT_TAGS
static int setup_use_tagged_queuing = -1;
module_param(setup_use_tagged_queuing, int, 0);
-#endif
static int setup_hostid = -1;
module_param(setup_hostid, int, 0);
+static int setup_toshiba_delay = -1;
+module_param(setup_toshiba_delay, int, 0);


#if defined(REAL_DMA)
@@ -488,7 +479,7 @@ static int __init atari_scsi_setup(char
* Defaults depend on TT or Falcon, determined at run time.
* Negative values mean don't change.
*/
- int ints[6];
+ int ints[8];

get_options(str, ARRAY_SIZE(ints), ints);

@@ -504,10 +495,11 @@ static int __init atari_scsi_setup(char
setup_sg_tablesize = ints[3];
if (ints[0] >= 4)
setup_hostid = ints[4];
-#ifdef SUPPORT_TAGS
if (ints[0] >= 5)
setup_use_tagged_queuing = ints[5];
-#endif
+ /* ints[6] (use_pdma) is ignored */
+ if (ints[0] >= 7)
+ setup_toshiba_delay = ints[7];

return 1;
}
@@ -516,38 +508,6 @@ __setup("atascsi=", atari_scsi_setup);
#endif /* !MODULE */


-#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
-static void __init atari_scsi_reset_boot(void)
-{
- unsigned long end;
-
- /*
- * Do a SCSI reset to clean up the bus during initialization. No messing
- * with the queues, interrupts, or locks necessary here.
- */
-
- printk("Atari SCSI: resetting the SCSI bus...");
-
- /* get in phase */
- NCR5380_write(TARGET_COMMAND_REG,
- PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
-
- /* assert RST */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
- /* The min. reset hold time is 25us, so 40us should be enough */
- udelay(50);
- /* reset RST and interrupt */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- NCR5380_read(RESET_PARITY_INTERRUPT_REG);
-
- end = jiffies + AFTER_RESET_DELAY;
- while (time_before(jiffies, end))
- barrier();
-
- printk(" done\n");
-}
-#endif
-
#if defined(REAL_DMA)

static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance,
@@ -917,17 +877,13 @@ static int __init atari_scsi_probe(struc
}
atari_scsi_host = instance;

-#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
- atari_scsi_reset_boot();
-#endif
-
instance->irq = irq->start;

host_flags |= IS_A_TT() ? 0 : FLAG_LATE_DMA_SETUP;
-
#ifdef SUPPORT_TAGS
host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0;
#endif
+ host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;

NCR5380_init(instance, host_flags);

@@ -975,6 +931,8 @@ static int __init atari_scsi_probe(struc
#endif
}

+ NCR5380_maybe_reset_bus(instance);
+
error = scsi_add_host(instance, NULL);
if (error)
goto fail_host;
Index: linux/drivers/scsi/mac_scsi.c
===================================================================
--- linux.orig/drivers/scsi/mac_scsi.c 2015-11-18 19:33:05.000000000 +1100
+++ linux/drivers/scsi/mac_scsi.c 2015-11-18 19:33:15.000000000 +1100
@@ -49,8 +49,6 @@

#include "NCR5380.h"

-#define RESET_BOOT
-
static int setup_can_queue = -1;
module_param(setup_can_queue, int, 0);
static int setup_cmd_per_lun = -1;
@@ -63,17 +61,8 @@ static int setup_use_tagged_queuing = -1
module_param(setup_use_tagged_queuing, int, 0);
static int setup_hostid = -1;
module_param(setup_hostid, int, 0);
-
-/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
- * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
- * need ten times the standard value... */
-#define TOSHIBA_DELAY
-
-#ifdef TOSHIBA_DELAY
-#define AFTER_RESET_DELAY (5*HZ/2)
-#else
-#define AFTER_RESET_DELAY (HZ/2)
-#endif
+static int setup_toshiba_delay = -1;
+module_param(setup_toshiba_delay, int, 0);

/*
* NCR 5380 register access functions
@@ -92,12 +81,12 @@ static inline void macscsi_write(struct
#ifndef MODULE
static int __init mac_scsi_setup(char *str)
{
- int ints[7];
+ int ints[8];

(void)get_options(str, ARRAY_SIZE(ints), ints);

- if (ints[0] < 1 || ints[0] > 6) {
- pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>]]]]]\n");
+ if (ints[0] < 1) {
+ pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,toshiba_delay]]]]]]\n");
return 0;
}
if (ints[0] >= 1)
@@ -112,47 +101,14 @@ static int __init mac_scsi_setup(char *s
setup_use_tagged_queuing = ints[5];
if (ints[0] >= 6)
setup_use_pdma = ints[6];
+ if (ints[0] >= 7)
+ setup_toshiba_delay = ints[7];
return 1;
}

__setup("mac5380=", mac_scsi_setup);
#endif /* !MODULE */

-#ifdef RESET_BOOT
-/*
- * Our 'bus reset on boot' function
- */
-
-static void mac_scsi_reset_boot(struct Scsi_Host *instance)
-{
- unsigned long end;
-
- /*
- * Do a SCSI reset to clean up the bus during initialization. No messing
- * with the queues, interrupts, or locks necessary here.
- */
-
- printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
-
- /* get in phase */
- NCR5380_write( TARGET_COMMAND_REG,
- PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
-
- /* assert RST */
- NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
- /* The min. reset hold time is 25us, so 40us should be enough */
- udelay( 50 );
- /* reset RST and interrupt */
- NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
- NCR5380_read( RESET_PARITY_INTERRUPT_REG );
-
- for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
- barrier();
-
- printk(KERN_INFO " done\n" );
-}
-#endif
-
#ifdef PSEUDO_DMA
/*
Pseudo-DMA: (Ove Edlund)
@@ -421,13 +377,10 @@ static int __init mac_scsi_probe(struct
} else
host_flags |= FLAG_NO_PSEUDO_DMA;

-#ifdef RESET_BOOT
- mac_scsi_reset_boot(instance);
-#endif
-
#ifdef SUPPORT_TAGS
host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0;
#endif
+ host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;

NCR5380_init(instance, host_flags);

@@ -438,6 +391,8 @@ static int __init mac_scsi_probe(struct
goto fail_irq;
}

+ NCR5380_maybe_reset_bus(instance);
+
error = scsi_add_host(instance, NULL);
if (error)
goto fail_host;
Index: linux/drivers/scsi/sun3_scsi.c
===================================================================
--- linux.orig/drivers/scsi/sun3_scsi.c 2015-11-18 19:32:59.000000000 +1100
+++ linux/drivers/scsi/sun3_scsi.c 2015-11-18 19:33:15.000000000 +1100
@@ -86,10 +86,6 @@ module_param(setup_use_tagged_queuing, i
static int setup_hostid = -1;
module_param(setup_hostid, int, 0);

-/* #define RESET_BOOT */
-
-#define AFTER_RESET_DELAY (HZ/2)
-
/* ms to wait after hitting dma regs */
#define SUN3_DMA_DELAY 10

@@ -144,45 +140,6 @@ static inline void sun3_udc_write(unsign
}
#endif

-#ifdef RESET_BOOT
-static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
-{
- unsigned long end;
-
- /*
- * Do a SCSI reset to clean up the bus during initialization. No
- * messing with the queues, interrupts, or locks necessary here.
- */
-
- printk( "Sun3 SCSI: resetting the SCSI bus..." );
-
- /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
-// sun3_disable_irq( IRQ_SUN3_SCSI );
-
- /* get in phase */
- NCR5380_write( TARGET_COMMAND_REG,
- PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
-
- /* assert RST */
- NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
-
- /* The min. reset hold time is 25us, so 40us should be enough */
- udelay( 50 );
-
- /* reset RST and interrupt */
- NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
- NCR5380_read( RESET_PARITY_INTERRUPT_REG );
-
- for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
- barrier();
-
- /* switch on SCSI IRQ again */
-// sun3_enable_irq( IRQ_SUN3_SCSI );
-
- printk( " done\n" );
-}
-#endif
-
// safe bits for the CSR
#define CSR_GOOD 0x060f

@@ -631,9 +588,7 @@ static int __init sun3_scsi_probe(struct
dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
#endif

-#ifdef RESET_BOOT
- sun3_scsi_reset_boot(instance);
-#endif
+ NCR5380_maybe_reset_bus(instance);

error = scsi_add_host(instance, NULL);
if (error)
Index: linux/drivers/scsi/NCR5380.h
===================================================================
--- linux.orig/drivers/scsi/NCR5380.h 2015-11-18 19:33:10.000000000 +1100
+++ linux/drivers/scsi/NCR5380.h 2015-11-18 19:33:15.000000000 +1100
@@ -243,6 +243,7 @@
#define FLAG_DTC3181E 16 /* DTC3181E */
#define FLAG_LATE_DMA_SETUP 32 /* Setup NCR before DMA H/W */
#define FLAG_TAGGED_QUEUING 64 /* as X3T9.2 spelled it */
+#define FLAG_TOSHIBA_DELAY 128 /* Allow for borken CD-ROMs */

#ifdef SUPPORT_TAGS
struct tag_alloc {
Index: linux/drivers/scsi/NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/NCR5380.c 2015-11-18 19:33:13.000000000 +1100
+++ linux/drivers/scsi/NCR5380.c 2015-11-18 19:33:15.000000000 +1100
@@ -618,7 +618,7 @@ static void prepare_info(struct Scsi_Hos
"base 0x%lx, irq %d, "
"can_queue %d, cmd_per_lun %d, "
"sg_tablesize %d, this_id %d, "
- "flags { %s%s%s}, "
+ "flags { %s%s%s%s}, "
#if defined(USLEEP_POLL) && defined(USLEEP_WAITLONG)
"USLEEP_POLL %lu, USLEEP_WAITLONG %lu, "
#endif
@@ -630,6 +630,7 @@ static void prepare_info(struct Scsi_Hos
hostdata->flags & FLAG_NCR53C400 ? "NCR53C400 " : "",
hostdata->flags & FLAG_DTC3181E ? "DTC3181E " : "",
hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "",
+ hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "",
#if defined(USLEEP_POLL) && defined(USLEEP_WAITLONG)
USLEEP_POLL, USLEEP_WAITLONG,
#endif
@@ -831,6 +832,7 @@ static int NCR5380_init(struct Scsi_Host

static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance)
{
+ struct NCR5380_hostdata *hostdata = shost_priv(instance);
int pass;

for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
@@ -849,6 +851,14 @@ static int NCR5380_maybe_reset_bus(struc
case 4:
shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n");
do_reset(instance);
+ /* Wait after a reset; the SCSI standard calls for
+ * 250ms, we wait 500ms to be on the safe side.
+ * But some Toshiba CD-ROMs need ten times that.
+ */
+ if (hostdata->flags & FLAG_TOSHIBA_DELAY)
+ msleep(2500);
+ else
+ msleep(500);
break;
case 6:
shost_printk(KERN_ERR, instance, "bus locked solid\n");
@@ -1253,7 +1263,10 @@ static int NCR5380_select(struct Scsi_Ho
* a minimum so we'll udelay ceil(1.2)
*/

- udelay(2);
+ if (hostdata->flags & FLAG_TOSHIBA_DELAY)
+ udelay(15);
+ else
+ udelay(2);

dprintk(NDEBUG_ARBITRATION, "scsi%d : won arbitration\n", instance->host_no);




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