ncr53c8xx.c

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	return m;
}

static void __m_free_dma(m_bush_t bush, void *m, int size, char *name)
{
	u_long flags;
	struct m_pool *mp;

	spin_lock_irqsave(&ncr53c8xx_lock, flags);
	mp = ___get_dma_pool(bush);
	if (mp)
		__m_free(mp, m, size, name);
	if (mp && !mp->nump)
		___del_dma_pool(mp);
	spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
}

static m_addr_t __vtobus(m_bush_t bush, void *m)
{
	u_long flags;
	m_pool_s *mp;
	int hc = VTOB_HASH_CODE(m);
	m_vtob_s *vp = NULL;
	m_addr_t a = ((m_addr_t) m) & ~MEMO_CLUSTER_MASK;

	spin_lock_irqsave(&ncr53c8xx_lock, flags);
	mp = ___get_dma_pool(bush);
	if (mp) {
		vp = mp->vtob[hc];
		while (vp && (m_addr_t) vp->vaddr != a)
			vp = vp->next;
	}
	spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
	return vp ? vp->baddr + (((m_addr_t) m) - a) : 0;
}

#define _m_calloc_dma(np, s, n)		__m_calloc_dma(np->dev, s, n)
#define _m_free_dma(np, p, s, n)	__m_free_dma(np->dev, p, s, n)
#define m_calloc_dma(s, n)		_m_calloc_dma(np, s, n)
#define m_free_dma(p, s, n)		_m_free_dma(np, p, s, n)
#define _vtobus(np, p)			__vtobus(np->dev, p)
#define vtobus(p)			_vtobus(np, p)

/*
 *  Deal with DMA mapping/unmapping.
 */

/* To keep track of the dma mapping (sg/single) that has been set */
#define __data_mapped	SCp.phase
#define __data_mapping	SCp.have_data_in

static void __unmap_scsi_data(struct device *dev, struct scsi_cmnd *cmd)
{
	switch(cmd->__data_mapped) {
	case 2:
		scsi_dma_unmap(cmd);
		break;
	}
	cmd->__data_mapped = 0;
}

static int __map_scsi_sg_data(struct device *dev, struct scsi_cmnd *cmd)
{
	int use_sg;

	use_sg = scsi_dma_map(cmd);
	if (!use_sg)
		return 0;

	cmd->__data_mapped = 2;
	cmd->__data_mapping = use_sg;

	return use_sg;
}

#define unmap_scsi_data(np, cmd)	__unmap_scsi_data(np->dev, cmd)
#define map_scsi_sg_data(np, cmd)	__map_scsi_sg_data(np->dev, cmd)

/*==========================================================
**
**	Driver setup.
**
**	This structure is initialized from linux config 
**	options. It can be overridden at boot-up by the boot 
**	command line.
**
**==========================================================
*/
static struct ncr_driver_setup
	driver_setup			= SCSI_NCR_DRIVER_SETUP;

#ifndef MODULE
#ifdef	SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
static struct ncr_driver_setup
	driver_safe_setup __initdata	= SCSI_NCR_DRIVER_SAFE_SETUP;
#endif
#endif /* !MODULE */

#define initverbose (driver_setup.verbose)
#define bootverbose (np->verbose)


/*===================================================================
**
**	Driver setup from the boot command line
**
**===================================================================
*/

#ifdef MODULE
#define	ARG_SEP	' '
#else
#define	ARG_SEP	','
#endif

#define OPT_TAGS		1
#define OPT_MASTER_PARITY	2
#define OPT_SCSI_PARITY		3
#define OPT_DISCONNECTION	4
#define OPT_SPECIAL_FEATURES	5
#define OPT_UNUSED_1		6
#define OPT_FORCE_SYNC_NEGO	7
#define OPT_REVERSE_PROBE	8
#define OPT_DEFAULT_SYNC	9
#define OPT_VERBOSE		10
#define OPT_DEBUG		11
#define OPT_BURST_MAX		12
#define OPT_LED_PIN		13
#define OPT_MAX_WIDE		14
#define OPT_SETTLE_DELAY	15
#define OPT_DIFF_SUPPORT	16
#define OPT_IRQM		17
#define OPT_PCI_FIX_UP		18
#define OPT_BUS_CHECK		19
#define OPT_OPTIMIZE		20
#define OPT_RECOVERY		21
#define OPT_SAFE_SETUP		22
#define OPT_USE_NVRAM		23
#define OPT_EXCLUDE		24
#define OPT_HOST_ID		25

#ifdef SCSI_NCR_IARB_SUPPORT
#define OPT_IARB		26
#endif

#ifdef MODULE
#define	ARG_SEP	' '
#else
#define	ARG_SEP	','
#endif

#ifndef MODULE
static char setup_token[] __initdata = 
	"tags:"   "mpar:"
	"spar:"   "disc:"
	"specf:"  "ultra:"
	"fsn:"    "revprob:"
	"sync:"   "verb:"
	"debug:"  "burst:"
	"led:"    "wide:"
	"settle:" "diff:"
	"irqm:"   "pcifix:"
	"buschk:" "optim:"
	"recovery:"
	"safe:"   "nvram:"
	"excl:"   "hostid:"
#ifdef SCSI_NCR_IARB_SUPPORT
	"iarb:"
#endif
	;	/* DONNOT REMOVE THIS ';' */

static int __init get_setup_token(char *p)
{
	char *cur = setup_token;
	char *pc;
	int i = 0;

	while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
		++pc;
		++i;
		if (!strncmp(p, cur, pc - cur))
			return i;
		cur = pc;
	}
	return 0;
}

static int __init sym53c8xx__setup(char *str)
{
#ifdef SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
	char *cur = str;
	char *pc, *pv;
	int i, val, c;
	int xi = 0;

	while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
		char *pe;

		val = 0;
		pv = pc;
		c = *++pv;

		if	(c == 'n')
			val = 0;
		else if	(c == 'y')
			val = 1;
		else
			val = (int) simple_strtoul(pv, &pe, 0);

		switch (get_setup_token(cur)) {
		case OPT_TAGS:
			driver_setup.default_tags = val;
			if (pe && *pe == '/') {
				i = 0;
				while (*pe && *pe != ARG_SEP && 
					i < sizeof(driver_setup.tag_ctrl)-1) {
					driver_setup.tag_ctrl[i++] = *pe++;
				}
				driver_setup.tag_ctrl[i] = '\0';
			}
			break;
		case OPT_MASTER_PARITY:
			driver_setup.master_parity = val;
			break;
		case OPT_SCSI_PARITY:
			driver_setup.scsi_parity = val;
			break;
		case OPT_DISCONNECTION:
			driver_setup.disconnection = val;
			break;
		case OPT_SPECIAL_FEATURES:
			driver_setup.special_features = val;
			break;
		case OPT_FORCE_SYNC_NEGO:
			driver_setup.force_sync_nego = val;
			break;
		case OPT_REVERSE_PROBE:
			driver_setup.reverse_probe = val;
			break;
		case OPT_DEFAULT_SYNC:
			driver_setup.default_sync = val;
			break;
		case OPT_VERBOSE:
			driver_setup.verbose = val;
			break;
		case OPT_DEBUG:
			driver_setup.debug = val;
			break;
		case OPT_BURST_MAX:
			driver_setup.burst_max = val;
			break;
		case OPT_LED_PIN:
			driver_setup.led_pin = val;
			break;
		case OPT_MAX_WIDE:
			driver_setup.max_wide = val? 1:0;
			break;
		case OPT_SETTLE_DELAY:
			driver_setup.settle_delay = val;
			break;
		case OPT_DIFF_SUPPORT:
			driver_setup.diff_support = val;
			break;
		case OPT_IRQM:
			driver_setup.irqm = val;
			break;
		case OPT_PCI_FIX_UP:
			driver_setup.pci_fix_up	= val;
			break;
		case OPT_BUS_CHECK:
			driver_setup.bus_check = val;
			break;
		case OPT_OPTIMIZE:
			driver_setup.optimize = val;
			break;
		case OPT_RECOVERY:
			driver_setup.recovery = val;
			break;
		case OPT_USE_NVRAM:
			driver_setup.use_nvram = val;
			break;
		case OPT_SAFE_SETUP:
			memcpy(&driver_setup, &driver_safe_setup,
				sizeof(driver_setup));
			break;
		case OPT_EXCLUDE:
			if (xi < SCSI_NCR_MAX_EXCLUDES)
				driver_setup.excludes[xi++] = val;
			break;
		case OPT_HOST_ID:
			driver_setup.host_id = val;
			break;
#ifdef SCSI_NCR_IARB_SUPPORT
		case OPT_IARB:
			driver_setup.iarb = val;
			break;
#endif
		default:
			printk("sym53c8xx_setup: unexpected boot option '%.*s' ignored\n", (int)(pc-cur+1), cur);
			break;
		}

		if ((cur = strchr(cur, ARG_SEP)) != NULL)
			++cur;
	}
#endif /* SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT */
	return 1;
}
#endif /* !MODULE */

/*===================================================================
**
**	Get device queue depth from boot command line.
**
**===================================================================
*/
#define DEF_DEPTH	(driver_setup.default_tags)
#define ALL_TARGETS	-2
#define NO_TARGET	-1
#define ALL_LUNS	-2
#define NO_LUN		-1

static int device_queue_depth(int unit, int target, int lun)
{
	int c, h, t, u, v;
	char *p = driver_setup.tag_ctrl;
	char *ep;

	h = -1;
	t = NO_TARGET;
	u = NO_LUN;
	while ((c = *p++) != 0) {
		v = simple_strtoul(p, &ep, 0);
		switch(c) {
		case '/':
			++h;
			t = ALL_TARGETS;
			u = ALL_LUNS;
			break;
		case 't':
			if (t != target)
				t = (target == v) ? v : NO_TARGET;
			u = ALL_LUNS;
			break;
		case 'u':
			if (u != lun)
				u = (lun == v) ? v : NO_LUN;
			break;
		case 'q':
			if (h == unit &&
				(t == ALL_TARGETS || t == target) &&
				(u == ALL_LUNS    || u == lun))
				return v;
			break;
		case '-':
			t = ALL_TARGETS;
			u = ALL_LUNS;
			break;
		default:
			break;
		}
		p = ep;
	}
	return DEF_DEPTH;
}


/*==========================================================
**
**	The CCB done queue uses an array of CCB virtual 
**	addresses. Empty entries are flagged using the bogus 
**	virtual address 0xffffffff.
**
**	Since PCI ensures that only aligned DWORDs are accessed 
**	atomically, 64 bit little-endian architecture requires 
**	to test the high order DWORD of the entry to determine 
**	if it is empty or valid.
**
**	BTW, I will make things differently as soon as I will 
**	have a better idea, but this is simple and should work.
**
**==========================================================
*/
 
#define SCSI_NCR_CCB_DONE_SUPPORT
#ifdef  SCSI_NCR_CCB_DONE_SUPPORT

#define MAX_DONE 24
#define CCB_DONE_EMPTY 0xffffffffUL

/* All 32 bit architectures */
#if BITS_PER_LONG == 32
#define CCB_DONE_VALID(cp)  (((u_long) cp) != CCB_DONE_EMPTY)

/* All > 32 bit (64 bit) architectures regardless endian-ness */
#else
#define CCB_DONE_VALID(cp)  \
	((((u_long) cp) & 0xffffffff00000000ul) && 	\
	 (((u_long) cp) & 0xfffffffful) != CCB_DONE_EMPTY)
#endif

#endif /* SCSI_NCR_CCB_DONE_SUPPORT */

/*==========================================================
**
**	Configuration and Debugging
**
**==========================================================
*/

/*
**    SCSI address of this device.
**    The boot routines should have set it.
**    If not, use this.
*/

#ifndef SCSI_NCR_MYADDR
#define SCSI_NCR_MYADDR      (7)
#endif

/*
**    The maximum number of tags per logic unit.
**    Used only for disk devices that support tags.
*/

#ifndef SCSI_NCR_MAX_TAGS
#define SCSI_NCR_MAX_TAGS    (8)
#endif

/*
**    TAGS are actually limited to 64 tags/lun.
**    We need to deal with power of 2, for alignment constraints.
*/
#if	SCSI_NCR_MAX_TAGS > 64
#define	MAX_TAGS (64)
#else
#define	MAX_TAGS SCSI_NCR_MAX_TAGS
#endif

#define NO_TAG	(255)

/*
**	Choose appropriate type for tag bitmap.
*/
#if	MAX_TAGS > 32
typedef u64 tagmap_t;
#else
typedef u32 tagmap_t;
#endif

/*
**    Number of targets supported by the driver.
**    n permits target numbers 0..n-1.
**    Default is 16, meaning targets #0..#15.
**    #7 .. is myself.
*/

#ifdef SCSI_NCR_MAX_TARGET
#define MAX_TARGET  (SCSI_NCR_MAX_TARGET)
#else
#define MAX_TARGET  (16)
#endif

/*
**    Number of logic units supported by the driver.
**    n enables logic unit numbers 0..n-1.
**    The common SCSI devices require only
**    one lun, so take 1 as the default.
*/

#ifdef SCSI_NCR_MAX_LUN
#define MAX_LUN    SCSI_NCR_MAX_LUN
#else
#define MAX_LUN    (1)
#endif