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m68k: Reformat the Atari SCSI driver 

Reformat the Atari SCSI driver

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roman Zippel 2007-05-01 22:32:36 +02:00 коммит произвёл Linus Torvalds
Родитель fb810d121b
Коммит c28bda2517
2 изменённых файлов: 2366 добавлений и 2368 удалений
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4373
drivers/scsi/atari_NCR5380.c
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361
drivers/scsi/atari_scsi.c
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@ -186,38 +186,37 @@ static inline void DISABLE_IRQ(void)
/***************************** Prototypes *****************************/
#ifdef REAL_DMA
static int scsi_dma_is_ignored_buserr( unsigned char dma_stat );
static void atari_scsi_fetch_restbytes( void );
static long atari_scsi_dma_residual( struct Scsi_Host *instance );
static int falcon_classify_cmd( Scsi_Cmnd *cmd );
static unsigned long atari_dma_xfer_len( unsigned long wanted_len,
Scsi_Cmnd *cmd, int write_flag );
static int scsi_dma_is_ignored_buserr(unsigned char dma_stat);
static void atari_scsi_fetch_restbytes(void);
static long atari_scsi_dma_residual(struct Scsi_Host *instance);
static int falcon_classify_cmd(Scsi_Cmnd *cmd);
static unsigned long atari_dma_xfer_len(unsigned long wanted_len,
Scsi_Cmnd *cmd, int write_flag);
#endif
static irqreturn_t scsi_tt_intr( int irq, void *dummy);
static irqreturn_t scsi_falcon_intr( int irq, void *dummy);
static void falcon_release_lock_if_possible( struct NCR5380_hostdata *
hostdata );
static void falcon_get_lock( void );
static irqreturn_t scsi_tt_intr(int irq, void *dummy);
static irqreturn_t scsi_falcon_intr(int irq, void *dummy);
static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata);
static void falcon_get_lock(void);
#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
static void atari_scsi_reset_boot( void );
static void atari_scsi_reset_boot(void);
#endif
static unsigned char atari_scsi_tt_reg_read( unsigned char reg );
static void atari_scsi_tt_reg_write( unsigned char reg, unsigned char value);
static unsigned char atari_scsi_falcon_reg_read( unsigned char reg );
static void atari_scsi_falcon_reg_write( unsigned char reg, unsigned char value );
static unsigned char atari_scsi_tt_reg_read(unsigned char reg);
static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value);
static unsigned char atari_scsi_falcon_reg_read(unsigned char reg);
static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value);
/************************* End of Prototypes **************************/
static struct Scsi_Host *atari_scsi_host = NULL;
static unsigned char (*atari_scsi_reg_read)( unsigned char reg );
static void (*atari_scsi_reg_write)( unsigned char reg, unsigned char value );
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);
#ifdef REAL_DMA
static unsigned long atari_dma_residual, atari_dma_startaddr;
static short atari_dma_active;
/* pointer to the dribble buffer */
static char *atari_dma_buffer = NULL;
static char *atari_dma_buffer;
/* precalculated physical address of the dribble buffer */
static unsigned long atari_dma_phys_buffer;
/* != 0 tells the Falcon int handler to copy data from the dribble buffer */
@ -233,7 +232,7 @@ static char *atari_dma_orig_addr;
static unsigned long atari_dma_stram_mask;
#define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0)
/* number of bytes to cut from a transfer to handle NCR overruns */
static int atari_read_overruns = 0;
static int atari_read_overruns;
#endif
static int setup_can_queue = -1;
@ -256,10 +255,10 @@ module_param(setup_hostid, int, 0);
#if defined(REAL_DMA)
static int scsi_dma_is_ignored_buserr( unsigned char dma_stat )
static int scsi_dma_is_ignored_buserr(unsigned char dma_stat)
{
int i;
unsigned long addr = SCSI_DMA_READ_P( dma_addr ), end_addr;
unsigned long addr = SCSI_DMA_READ_P(dma_addr), end_addr;
if (dma_stat & 0x01) {
@ -267,15 +266,14 @@ static int scsi_dma_is_ignored_buserr( unsigned char dma_stat )
* physical memory chunk (DMA prefetch!), but that doesn't hurt.
* Check for this case:
*/
for( i = 0; i < m68k_num_memory; ++i ) {
end_addr = m68k_memory[i].addr +
m68k_memory[i].size;
for (i = 0; i < m68k_num_memory; ++i) {
end_addr = m68k_memory[i].addr + m68k_memory[i].size;
if (end_addr <= addr && addr <= end_addr + 4)
return( 1 );
return 1;
}
}
return( 0 );
return 0;
}
@ -284,28 +282,27 @@ static int scsi_dma_is_ignored_buserr( unsigned char dma_stat )
* end-of-DMA, both SCSI ints are triggered simultaneously, so the NCR int has
* to clear the DMA int pending bit before it allows other level 6 interrupts.
*/
static void scsi_dma_buserr (int irq, void *dummy)
static void scsi_dma_buserr(int irq, void *dummy)
{
unsigned char dma_stat = tt_scsi_dma.dma_ctrl;
unsigned char dma_stat = tt_scsi_dma.dma_ctrl;
/* Don't do anything if a NCR interrupt is pending. Probably it's just
* masked... */
if (atari_irq_pending( IRQ_TT_MFP_SCSI ))
if (atari_irq_pending(IRQ_TT_MFP_SCSI))
return;
printk("Bad SCSI DMA interrupt! dma_addr=0x%08lx dma_stat=%02x dma_cnt=%08lx\n",
SCSI_DMA_READ_P(dma_addr), dma_stat, SCSI_DMA_READ_P(dma_cnt));
if (dma_stat & 0x80) {
if (!scsi_dma_is_ignored_buserr( dma_stat ))
printk( "SCSI DMA bus error -- bad DMA programming!\n" );
}
else {
if (!scsi_dma_is_ignored_buserr(dma_stat))
printk("SCSI DMA bus error -- bad DMA programming!\n");
} else {
/* Under normal circumstances we never should get to this point,
* since both interrupts are triggered simultaneously and the 5380
* int has higher priority. When this irq is handled, that DMA
* interrupt is cleared. So a warning message is printed here.
*/
printk( "SCSI DMA intr ?? -- this shouldn't happen!\n" );
printk("SCSI DMA intr ?? -- this shouldn't happen!\n");
}
}
#endif
@ -313,7 +310,7 @@ static void scsi_dma_buserr (int irq, void *dummy)
#endif
static irqreturn_t scsi_tt_intr (int irq, void *dummy)
static irqreturn_t scsi_tt_intr(int irq, void *dummy)
{
#ifdef REAL_DMA
int dma_stat;
@ -327,7 +324,7 @@ static irqreturn_t scsi_tt_intr (int irq, void *dummy)
* is that a bus error occurred...
*/
if (dma_stat & 0x80) {
if (!scsi_dma_is_ignored_buserr( dma_stat )) {
if (!scsi_dma_is_ignored_buserr(dma_stat)) {
printk(KERN_ERR "SCSI DMA caused bus error near 0x%08lx\n",
SCSI_DMA_READ_P(dma_addr));
printk(KERN_CRIT "SCSI DMA bus error -- bad DMA programming!");
@ -344,8 +341,7 @@ static irqreturn_t scsi_tt_intr (int irq, void *dummy)
* 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_DMALEN - (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr);
DMA_PRINTK("SCSI DMA: There are %ld residual bytes.\n",
atari_dma_residual);
@ -353,28 +349,30 @@ static irqreturn_t scsi_tt_intr (int irq, void *dummy)
if ((signed int)atari_dma_residual < 0)
atari_dma_residual = 0;
if ((dma_stat & 1) == 0) {
/* After read operations, we maybe have to
transport some rest bytes */
/*
* After read operations, we maybe have to
* transport some rest bytes
*/
atari_scsi_fetch_restbytes();
}
else {
/* There seems to be a nasty bug in some SCSI-DMA/NCR
combinations: If a target disconnects while a write
operation is going on, the address register of the
DMA may be a few bytes farer than it actually read.
This is probably due to DMA prefetching and a delay
between DMA and NCR. Experiments showed that the
dma_addr is 9 bytes to high, but this could vary.
The problem is, that the residual is thus calculated
wrong and the next transfer will start behind where
it should. So we round up the residual to the next
multiple of a sector size, if it isn't already a
multiple and the originally expected transfer size
was. The latter condition is there to ensure that
the correction is taken only for "real" data
transfers and not for, e.g., the parameters of some
other command. These shouldn't disconnect anyway.
*/
} else {
/*
* There seems to be a nasty bug in some SCSI-DMA/NCR
* combinations: If a target disconnects while a write
* operation is going on, the address register of the
* DMA may be a few bytes farer than it actually read.
* This is probably due to DMA prefetching and a delay
* between DMA and NCR. Experiments showed that the
* dma_addr is 9 bytes to high, but this could vary.
* The problem is, that the residual is thus calculated
* wrong and the next transfer will start behind where
* it should. So we round up the residual to the next
* multiple of a sector size, if it isn't already a
* multiple and the originally expected transfer size
* was. The latter condition is there to ensure that
* the correction is taken only for "real" data
* transfers and not for, e.g., the parameters of some
* other command. These shouldn't disconnect anyway.
*/
if (atari_dma_residual & 0x1ff) {
DMA_PRINTK("SCSI DMA: DMA bug corrected, "
"difference %ld bytes\n",
@ -394,18 +392,18 @@ static irqreturn_t scsi_tt_intr (int irq, void *dummy)
}
#endif /* REAL_DMA */
NCR5380_intr(0, 0);
#if 0
/* To be sure the int is not masked */
atari_enable_irq( IRQ_TT_MFP_SCSI );
atari_enable_irq(IRQ_TT_MFP_SCSI);
#endif
return IRQ_HANDLED;
}
static irqreturn_t scsi_falcon_intr (int irq, void *dummy)
static irqreturn_t scsi_falcon_intr(int irq, void *dummy)
{
#ifdef REAL_DMA
int dma_stat;
@ -430,7 +428,7 @@ static irqreturn_t scsi_falcon_intr (int irq, void *dummy)
* bytes are stuck in the ST-DMA fifo (there's no way to reach them!)
*/
if (atari_dma_active && (dma_stat & 0x02)) {
unsigned long transferred;
unsigned long transferred;
transferred = SCSI_DMA_GETADR() - atari_dma_startaddr;
/* The ST-DMA address is incremented in 2-byte steps, but the
@ -445,8 +443,7 @@ static irqreturn_t scsi_falcon_intr (int irq, void *dummy)
atari_dma_residual = HOSTDATA_DMALEN - transferred;
DMA_PRINTK("SCSI DMA: There are %ld residual bytes.\n",
atari_dma_residual);
}
else
} else
atari_dma_residual = 0;
atari_dma_active = 0;
@ -467,7 +464,7 @@ static irqreturn_t scsi_falcon_intr (int irq, void *dummy)
#ifdef REAL_DMA
static void atari_scsi_fetch_restbytes( void )
static void atari_scsi_fetch_restbytes(void)
{
int nr;
char *src, *dst;
@ -505,19 +502,17 @@ static int falcon_dont_release = 0;
* again (but others waiting longer more probably will win).
*/
static void
falcon_release_lock_if_possible( struct NCR5380_hostdata * hostdata )
static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata)
{
unsigned long flags;
if (IS_A_TT()) return;
if (IS_A_TT())
return;
local_irq_save(flags);
if (falcon_got_lock &&
!hostdata->disconnected_queue &&
!hostdata->issue_queue &&
!hostdata->connected) {
if (falcon_got_lock && !hostdata->disconnected_queue &&
!hostdata->issue_queue && !hostdata->connected) {
if (falcon_dont_release) {
#if 0
@ -528,7 +523,7 @@ falcon_release_lock_if_possible( struct NCR5380_hostdata * hostdata )
}
falcon_got_lock = 0;
stdma_release();
wake_up( &falcon_fairness_wait );
wake_up(&falcon_fairness_wait);
}
local_irq_restore(flags);
@ -549,31 +544,31 @@ falcon_release_lock_if_possible( struct NCR5380_hostdata * hostdata )
* Complicated, complicated.... Sigh...
*/
static void falcon_get_lock( void )
static void falcon_get_lock(void)
{
unsigned long flags;
if (IS_A_TT()) return;
if (IS_A_TT())
return;
local_irq_save(flags);
while (!in_irq() && falcon_got_lock && stdma_others_waiting())
sleep_on( &falcon_fairness_wait );
sleep_on(&falcon_fairness_wait);
while (!falcon_got_lock) {
if (in_irq())
panic( "Falcon SCSI hasn't ST-DMA lock in interrupt" );
panic("Falcon SCSI hasn't ST-DMA lock in interrupt");
if (!falcon_trying_lock) {
falcon_trying_lock = 1;
stdma_lock(scsi_falcon_intr, NULL);
falcon_got_lock = 1;
falcon_trying_lock = 0;
wake_up( &falcon_try_wait );
wake_up(&falcon_try_wait);
} else {
sleep_on(&falcon_try_wait);
}
else {
sleep_on( &falcon_try_wait );
}
}
}
local_irq_restore(flags);
if (!falcon_got_lock)
@ -587,18 +582,18 @@ static void falcon_get_lock( void )
*/
#if 0
int atari_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
int atari_queue_command(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
{
/* falcon_get_lock();
* ++guenther: moved to NCR5380_queue_command() to prevent
* race condition, see there for an explanation.
*/
return( NCR5380_queue_command( cmd, done ) );
return NCR5380_queue_command(cmd, done);
}
#endif
int atari_scsi_detect (struct scsi_host_template *host)
int atari_scsi_detect(struct scsi_host_template *host)
{
static int called = 0;
struct Scsi_Host *instance;
@ -606,7 +601,7 @@ int atari_scsi_detect (struct scsi_host_template *host)
if (!MACH_IS_ATARI ||
(!ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(TT_SCSI)) ||
called)
return( 0 );
return 0;
host->proc_name = "Atari";
@ -655,32 +650,33 @@ int atari_scsi_detect (struct scsi_host_template *host)
!ATARIHW_PRESENT(EXTD_DMA) && m68k_num_memory > 1) {
atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI");
if (!atari_dma_buffer) {
printk( KERN_ERR "atari_scsi_detect: can't allocate ST-RAM "
"double buffer\n" );
return( 0 );
printk(KERN_ERR "atari_scsi_detect: can't allocate ST-RAM "
"double buffer\n");
return 0;
}
atari_dma_phys_buffer = virt_to_phys( atari_dma_buffer );
atari_dma_phys_buffer = virt_to_phys(atari_dma_buffer);
atari_dma_orig_addr = 0;
}
#endif
instance = scsi_register (host, sizeof (struct NCR5380_hostdata));
if(instance == NULL)
{
instance = scsi_register(host, sizeof(struct NCR5380_hostdata));
if (instance == NULL) {
atari_stram_free(atari_dma_buffer);
atari_dma_buffer = 0;
return 0;
}
atari_scsi_host = instance;
/* Set irq to 0, to avoid that the mid-level code disables our interrupt
* during queue_command calls. This is completely unnecessary, and even
* worse causes bad problems on the Falcon, where the int is shared with
* IDE and floppy! */
/*
* Set irq to 0, to avoid that the mid-level code disables our interrupt
* during queue_command calls. This is completely unnecessary, and even
* worse causes bad problems on the Falcon, where the int is shared with
* IDE and floppy!
*/
instance->irq = 0;
#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
atari_scsi_reset_boot();
#endif
NCR5380_init (instance, 0);
NCR5380_init(instance, 0);
if (IS_A_TT()) {
@ -727,11 +723,10 @@ int atari_scsi_detect (struct scsi_host_template *host)
* the rest data bug is fixed, this can be lowered to 1.
*/
atari_read_overruns = 4;
}
}
#endif /*REAL_DMA*/
}
else { /* ! IS_A_TT */
} else { /* ! IS_A_TT */
/* Nothing to do for the interrupt: the ST-DMA is initialized
* already by atari_init_INTS()
*/
@ -756,19 +751,19 @@ int atari_scsi_detect (struct scsi_host_template *host)
setup_use_tagged_queuing ? "yes" : "no",
#endif
instance->hostt->this_id );
NCR5380_print_options (instance);
printk ("\n");
NCR5380_print_options(instance);
printk("\n");
called = 1;
return( 1 );
return 1;
}
int atari_scsi_release (struct Scsi_Host *sh)
int atari_scsi_release(struct Scsi_Host *sh)
{
if (IS_A_TT())
free_irq(IRQ_TT_MFP_SCSI, scsi_tt_intr);
if (atari_dma_buffer)
atari_stram_free (atari_dma_buffer);
atari_stram_free(atari_dma_buffer);
return 1;
}
@ -779,9 +774,9 @@ void __init atari_scsi_setup(char *str, int *ints)
* Defaults depend on TT or Falcon, hostid determined at run time.
* Negative values mean don't change.
*/
if (ints[0] < 1) {
printk( "atari_scsi_setup: no arguments!\n" );
printk("atari_scsi_setup: no arguments!\n");
return;
}
@ -807,7 +802,7 @@ void __init atari_scsi_setup(char *str, int *ints)
if (ints[4] >= 0 && ints[4] <= 7)
setup_hostid = ints[4];
else if (ints[4] > 7)
printk( "atari_scsi_setup: invalid host ID %d !\n", ints[4] );
printk("atari_scsi_setup: invalid host ID %d !\n", ints[4]);
}
#ifdef SUPPORT_TAGS
if (ints[0] >= 5) {
@ -819,7 +814,7 @@ void __init atari_scsi_setup(char *str, int *ints)
int atari_scsi_bus_reset(Scsi_Cmnd *cmd)
{
int rv;
int rv;
struct NCR5380_hostdata *hostdata =
(struct NCR5380_hostdata *)cmd->device->host->hostdata;
@ -829,13 +824,12 @@ int atari_scsi_bus_reset(Scsi_Cmnd *cmd)
*/
/* And abort a maybe active DMA transfer */
if (IS_A_TT()) {
atari_turnoff_irq( IRQ_TT_MFP_SCSI );
atari_turnoff_irq(IRQ_TT_MFP_SCSI);
#ifdef REAL_DMA
tt_scsi_dma.dma_ctrl = 0;
#endif /* REAL_DMA */
}
else {
atari_turnoff_irq( IRQ_MFP_FSCSI );
} else {
atari_turnoff_irq(IRQ_MFP_FSCSI);
#ifdef REAL_DMA
st_dma.dma_mode_status = 0x90;
atari_dma_active = 0;
@ -847,52 +841,51 @@ int atari_scsi_bus_reset(Scsi_Cmnd *cmd)
/* Re-enable ints */
if (IS_A_TT()) {
atari_turnon_irq( IRQ_TT_MFP_SCSI );
}
else {
atari_turnon_irq( IRQ_MFP_FSCSI );
atari_turnon_irq(IRQ_TT_MFP_SCSI);
} else {
atari_turnon_irq(IRQ_MFP_FSCSI);
}
if ((rv & SCSI_RESET_ACTION) == SCSI_RESET_SUCCESS)
falcon_release_lock_if_possible(hostdata);
return( rv );
return rv;
}
#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..." );
printk("Atari SCSI: resetting the SCSI bus...");
/* get in phase */
NCR5380_write( TARGET_COMMAND_REG,
PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
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 );
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
/* The min. reset hold time is 25us, so 40us should be enough */
udelay( 50 );
udelay(50);
/* reset RST and interrupt */
NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
NCR5380_read( RESET_PARITY_INTERRUPT_REG );
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" );
printk(" done\n");
}
#endif
const char * atari_scsi_info (struct Scsi_Host *host)
const char *atari_scsi_info(struct Scsi_Host *host)
{
/* atari_scsi_detect() is verbose enough... */
static const char string[] = "Atari native SCSI";
@ -902,10 +895,10 @@ const char * atari_scsi_info (struct Scsi_Host *host)
#if defined(REAL_DMA)
unsigned long atari_scsi_dma_setup( struct Scsi_Host *instance, void *data,
unsigned long count, int dir )
unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance, void *data,
unsigned long count, int dir)
{
unsigned long addr = virt_to_phys( data );
unsigned long addr = virt_to_phys(data);
DMA_PRINTK("scsi%d: setting up dma, data = %p, phys = %lx, count = %ld, "
"dir = %d\n", instance->host_no, data, addr, count, dir);
@ -917,38 +910,37 @@ unsigned long atari_scsi_dma_setup( struct Scsi_Host *instance, void *data,
* wanted address.
*/
if (dir)
memcpy( atari_dma_buffer, data, count );
memcpy(atari_dma_buffer, data, count);
else
atari_dma_orig_addr = data;
addr = atari_dma_phys_buffer;
}
atari_dma_startaddr = addr; /* Needed for calculating residual later. */
/* Cache cleanup stuff: On writes, push any dirty cache out before sending
* it to the peripheral. (Must be done before DMA setup, since at least
* the ST-DMA begins to fill internal buffers right after setup. For
* reads, invalidate any cache, may be altered after DMA without CPU
* knowledge.
*
*
* ++roman: For the Medusa, there's no need at all for that cache stuff,
* because the hardware does bus snooping (fine!).
*/
dma_cache_maintenance( addr, count, dir );
dma_cache_maintenance(addr, count, dir);
if (count == 0)
printk(KERN_NOTICE "SCSI warning: DMA programmed for 0 bytes !\n");
if (IS_A_TT()) {
tt_scsi_dma.dma_ctrl = dir;
SCSI_DMA_WRITE_P( dma_addr, addr );
SCSI_DMA_WRITE_P( dma_cnt, count );
SCSI_DMA_WRITE_P(dma_addr, addr);
SCSI_DMA_WRITE_P(dma_cnt, count);
tt_scsi_dma.dma_ctrl = dir | 2;
}
else { /* ! IS_A_TT */
} else { /* ! IS_A_TT */
/* set address */
SCSI_DMA_SETADR( addr );
SCSI_DMA_SETADR(addr);
/* toggle direction bit to clear FIFO and set DMA direction */
dir <<= 8;
@ -966,13 +958,13 @@ unsigned long atari_scsi_dma_setup( struct Scsi_Host *instance, void *data,
atari_dma_active = 1;
}
return( count );
return count;
}
static long atari_scsi_dma_residual( struct Scsi_Host *instance )
static long atari_scsi_dma_residual(struct Scsi_Host *instance)
{
return( atari_dma_residual );
return atari_dma_residual;
}
@ -980,13 +972,13 @@ static long atari_scsi_dma_residual( struct Scsi_Host *instance )
#define CMD_SURELY_BYTE_MODE 1
#define CMD_MODE_UNKNOWN 2
static int falcon_classify_cmd( Scsi_Cmnd *cmd )
static int falcon_classify_cmd(Scsi_Cmnd *cmd)
{
unsigned char opcode = cmd->cmnd[0];
if (opcode == READ_DEFECT_DATA || opcode == READ_LONG ||
opcode == READ_BUFFER)
return( CMD_SURELY_BYTE_MODE );
opcode == READ_BUFFER)
return CMD_SURELY_BYTE_MODE;
else if (opcode == READ_6 || opcode == READ_10 ||
opcode == 0xa8 /* READ_12 */ || opcode == READ_REVERSE ||
opcode == RECOVER_BUFFERED_DATA) {
@ -994,12 +986,11 @@ static int falcon_classify_cmd( Scsi_Cmnd *cmd )
* needed here: The transfer is block-mode only if the 'fixed' bit is
* set! */
if (cmd->device->type == TYPE_TAPE && !(cmd->cmnd[1] & 1))
return( CMD_SURELY_BYTE_MODE );
return CMD_SURELY_BYTE_MODE;
else
return( CMD_SURELY_BLOCK_MODE );
}
else
return( CMD_MODE_UNKNOWN );
return CMD_SURELY_BLOCK_MODE;
} else
return CMD_MODE_UNKNOWN;
}
@ -1012,19 +1003,18 @@ static int falcon_classify_cmd( Scsi_Cmnd *cmd )
* the overrun problem, so this question is academic :-)
*/
static unsigned long atari_dma_xfer_len( unsigned long wanted_len,
Scsi_Cmnd *cmd,
int write_flag )
static unsigned long atari_dma_xfer_len(unsigned long wanted_len,
Scsi_Cmnd *cmd, int write_flag)
{
unsigned long possible_len, limit;
#ifndef CONFIG_TT_DMA_EMUL
if (MACH_IS_HADES)
/* Hades has no SCSI DMA at all :-( Always force use of PIO */
return( 0 );
#endif
return 0;
#endif
if (IS_A_TT())
/* TT SCSI DMA can transfer arbitrary #bytes */
return( wanted_len );
return wanted_len;
/* ST DMA chip is stupid -- only multiples of 512 bytes! (and max.
* 255*512 bytes, but this should be enough)
@ -1060,8 +1050,7 @@ static unsigned long atari_dma_xfer_len( unsigned long wanted_len,
* this).
*/
possible_len = wanted_len;
}
else {
} else {
/* Read operations: if the wanted transfer length is not a multiple of
* 512, we cannot use DMA, since the ST-DMA cannot split transfers
* (no interrupt on DMA finished!)
@ -1071,15 +1060,15 @@ static unsigned long atari_dma_xfer_len( unsigned long wanted_len,
else {
/* Now classify the command (see above) and decide whether it is
* allowed to do DMA at all */
switch( falcon_classify_cmd( cmd )) {
case CMD_SURELY_BLOCK_MODE:
switch (falcon_classify_cmd(cmd)) {
case CMD_SURELY_BLOCK_MODE:
possible_len = wanted_len;
break;
case CMD_SURELY_BYTE_MODE:
case CMD_SURELY_BYTE_MODE:
possible_len = 0; /* DMA prohibited */
break;
case CMD_MODE_UNKNOWN:
default:
case CMD_MODE_UNKNOWN:
default:
/* For unknown commands assume block transfers if the transfer
* size/allocation length is >= 1024 */
possible_len = (wanted_len < 1024) ? 0 : wanted_len;
@ -1087,9 +1076,9 @@ static unsigned long atari_dma_xfer_len( unsigned long wanted_len,
}
}
}
/* Last step: apply the hard limit on DMA transfers */
limit = (atari_dma_buffer && !STRAM_ADDR( virt_to_phys(cmd->SCp.ptr) )) ?
limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ?
STRAM_BUFFER_SIZE : 255*512;
if (possible_len > limit)
possible_len = limit;
@ -1098,7 +1087,7 @@ static unsigned long atari_dma_xfer_len( unsigned long wanted_len,
DMA_PRINTK("Sorry, must cut DMA transfer size to %ld bytes "
"instead of %ld\n", possible_len, wanted_len);
return( possible_len );
return possible_len;
}
@ -1112,23 +1101,23 @@ static unsigned long atari_dma_xfer_len( unsigned long wanted_len,
* NCR5380_write call these functions via function pointers.
*/
static unsigned char atari_scsi_tt_reg_read( unsigned char reg )
static unsigned char atari_scsi_tt_reg_read(unsigned char reg)
{
return( tt_scsi_regp[reg * 2] );
return tt_scsi_regp[reg * 2];
}
static void atari_scsi_tt_reg_write( unsigned char reg, unsigned char value )
static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value)
{
tt_scsi_regp[reg * 2] = value;
}
static unsigned char atari_scsi_falcon_reg_read( unsigned char reg )
static unsigned char atari_scsi_falcon_reg_read(unsigned char reg)
{
dma_wd.dma_mode_status= (u_short)(0x88 + reg);
return( (u_char)dma_wd.fdc_acces_seccount );
return (u_char)dma_wd.fdc_acces_seccount;
}
static void atari_scsi_falcon_reg_write( unsigned char reg, unsigned char value )
static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value)
{
dma_wd.dma_mode_status = (u_short)(0x88 + reg);
dma_wd.fdc_acces_seccount = (u_short)value;