aic7xxx_osm.c

linux-2.6.15.6

	return (bp);
}

/*
 * Queue an SCB to the controller.
 */
static int
ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
{
	struct	 ahc_softc *ahc;
	struct	 ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
	int rtn = SCSI_MLQUEUE_HOST_BUSY;
	unsigned long flags;

	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;

	ahc_lock(ahc, &flags);
	if (ahc->platform_data->qfrozen == 0) {
		cmd->scsi_done = scsi_done;
		cmd->result = CAM_REQ_INPROG << 16;
		rtn = ahc_linux_run_command(ahc, dev, cmd);
	}
	ahc_unlock(ahc, &flags);

	return rtn;
}

static inline struct scsi_target **
ahc_linux_target_in_softc(struct scsi_target *starget)
{
	struct	ahc_softc *ahc =
		*((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
	unsigned int target_offset;

	target_offset = starget->id;
	if (starget->channel != 0)
		target_offset += 8;

	return &ahc->platform_data->starget[target_offset];
}

static int
ahc_linux_target_alloc(struct scsi_target *starget)
{
	struct	ahc_softc *ahc =
		*((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
	struct seeprom_config *sc = ahc->seep_config;
	unsigned long flags;
	struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
	struct ahc_linux_target *targ = scsi_transport_target_data(starget);
	unsigned short scsirate;
	struct ahc_devinfo devinfo;
	struct ahc_initiator_tinfo *tinfo;
	struct ahc_tmode_tstate *tstate;
	char channel = starget->channel + 'A';
	unsigned int our_id = ahc->our_id;
	unsigned int target_offset;

	target_offset = starget->id;
	if (starget->channel != 0)
		target_offset += 8;
	  
	if (starget->channel)
		our_id = ahc->our_id_b;

	ahc_lock(ahc, &flags);

	BUG_ON(*ahc_targp != NULL);

	*ahc_targp = starget;
	memset(targ, 0, sizeof(*targ));

	if (sc) {
		int maxsync = AHC_SYNCRATE_DT;
		int ultra = 0;
		int flags = sc->device_flags[target_offset];

		if (ahc->flags & AHC_NEWEEPROM_FMT) {
		    if (flags & CFSYNCHISULTRA)
			ultra = 1;
		} else if (flags & CFULTRAEN)
			ultra = 1;
		/* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
		 * change it to ultra=0, CFXFER = 0 */
		if(ultra && (flags & CFXFER) == 0x04) {
			ultra = 0;
			flags &= ~CFXFER;
		}
	    
		if ((ahc->features & AHC_ULTRA2) != 0) {
			scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
		} else {
			scsirate = (flags & CFXFER) << 4;
			maxsync = ultra ? AHC_SYNCRATE_ULTRA : 
				AHC_SYNCRATE_FAST;
		}
		spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
		if (!(flags & CFSYNCH))
			spi_max_offset(starget) = 0;
		spi_min_period(starget) = 
			ahc_find_period(ahc, scsirate, maxsync);

		tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
					    starget->id, &tstate);
	}
	ahc_compile_devinfo(&devinfo, our_id, starget->id,
			    CAM_LUN_WILDCARD, channel,
			    ROLE_INITIATOR);
	ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
			 AHC_TRANS_GOAL, /*paused*/FALSE);
	ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
		      AHC_TRANS_GOAL, /*paused*/FALSE);
	ahc_unlock(ahc, &flags);

	return 0;
}

static void
ahc_linux_target_destroy(struct scsi_target *starget)
{
	struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);

	*ahc_targp = NULL;
}

static int
ahc_linux_slave_alloc(struct scsi_device *sdev)
{
	struct	ahc_softc *ahc =
		*((struct ahc_softc **)sdev->host->hostdata);
	struct scsi_target *starget = sdev->sdev_target;
	struct ahc_linux_target *targ = scsi_transport_target_data(starget);
	struct ahc_linux_device *dev;

	if (bootverbose)
		printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);

	BUG_ON(targ->sdev[sdev->lun] != NULL);

	dev = scsi_transport_device_data(sdev);
	memset(dev, 0, sizeof(*dev));

	/*
	 * We start out life using untagged
	 * transactions of which we allow one.
	 */
	dev->openings = 1;

	/*
	 * Set maxtags to 0.  This will be changed if we
	 * later determine that we are dealing with
	 * a tagged queuing capable device.
	 */
	dev->maxtags = 0;
	
	targ->sdev[sdev->lun] = sdev;

	spi_period(starget) = 0;

	return 0;
}

static int
ahc_linux_slave_configure(struct scsi_device *sdev)
{
	struct	ahc_softc *ahc;

	ahc = *((struct ahc_softc **)sdev->host->hostdata);

	if (bootverbose)
		sdev_printk(KERN_INFO, sdev, "Slave Configure\n");

	ahc_linux_device_queue_depth(sdev);

	/* Initial Domain Validation */
	if (!spi_initial_dv(sdev->sdev_target))
		spi_dv_device(sdev);

	return 0;
}

static void
ahc_linux_slave_destroy(struct scsi_device *sdev)
{
	struct	ahc_softc *ahc;
	struct	ahc_linux_device *dev = scsi_transport_device_data(sdev);
	struct	ahc_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);

	ahc = *((struct ahc_softc **)sdev->host->hostdata);
	if (bootverbose)
		printf("%s: Slave Destroy %d\n", ahc_name(ahc), sdev->id);

	BUG_ON(dev->active);

	targ->sdev[sdev->lun] = NULL;
}

#if defined(__i386__)
/*
 * Return the disk geometry for the given SCSI device.
 */
static int
ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
		    sector_t capacity, int geom[])
{
	uint8_t *bh;
	int	 heads;
	int	 sectors;
	int	 cylinders;
	int	 ret;
	int	 extended;
	struct	 ahc_softc *ahc;
	u_int	 channel;

	ahc = *((struct ahc_softc **)sdev->host->hostdata);
	channel = sdev_channel(sdev);

	bh = scsi_bios_ptable(bdev);
	if (bh) {
		ret = scsi_partsize(bh, capacity,
				    &geom[2], &geom[0], &geom[1]);
		kfree(bh);
		if (ret != -1)
			return (ret);
	}
	heads = 64;
	sectors = 32;
	cylinders = aic_sector_div(capacity, heads, sectors);

	if (aic7xxx_extended != 0)
		extended = 1;
	else if (channel == 0)
		extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
	else
		extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
	if (extended && cylinders >= 1024) {
		heads = 255;
		sectors = 63;
		cylinders = aic_sector_div(capacity, heads, sectors);
	}
	geom[0] = heads;
	geom[1] = sectors;
	geom[2] = cylinders;
	return (0);
}
#endif

/*
 * Abort the current SCSI command(s).
 */
static int
ahc_linux_abort(struct scsi_cmnd *cmd)
{
	int error;

	error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
	if (error != 0)
		printf("aic7xxx_abort returns 0x%x\n", error);
	return (error);
}

/*
 * Attempt to send a target reset message to the device that timed out.
 */
static int
ahc_linux_dev_reset(struct scsi_cmnd *cmd)
{
	int error;

	error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
	if (error != 0)
		printf("aic7xxx_dev_reset returns 0x%x\n", error);
	return (error);
}

/*
 * Reset the SCSI bus.
 */
static int
ahc_linux_bus_reset(struct scsi_cmnd *cmd)
{
	struct ahc_softc *ahc;
	int    found;
	unsigned long flags;

	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;

	ahc_lock(ahc, &flags);
	found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
				  /*initiate reset*/TRUE);
	ahc_unlock(ahc, &flags);

	if (bootverbose)
		printf("%s: SCSI bus reset delivered. "
		       "%d SCBs aborted.\n", ahc_name(ahc), found);

	return SUCCESS;
}

struct scsi_host_template aic7xxx_driver_template = {
	.module			= THIS_MODULE,
	.name			= "aic7xxx",
	.proc_name		= "aic7xxx",
	.proc_info		= ahc_linux_proc_info,
	.info			= ahc_linux_info,
	.queuecommand		= ahc_linux_queue,
	.eh_abort_handler	= ahc_linux_abort,
	.eh_device_reset_handler = ahc_linux_dev_reset,
	.eh_bus_reset_handler	= ahc_linux_bus_reset,
#if defined(__i386__)
	.bios_param		= ahc_linux_biosparam,
#endif
	.can_queue		= AHC_MAX_QUEUE,
	.this_id		= -1,
	.cmd_per_lun		= 2,
	.use_clustering		= ENABLE_CLUSTERING,
	.slave_alloc		= ahc_linux_slave_alloc,
	.slave_configure	= ahc_linux_slave_configure,
	.slave_destroy		= ahc_linux_slave_destroy,
	.target_alloc		= ahc_linux_target_alloc,
	.target_destroy		= ahc_linux_target_destroy,
};

/**************************** Tasklet Handler *********************************/

/******************************** Macros **************************************/
#define BUILD_SCSIID(ahc, cmd)						    \
	((((cmd)->device->id << TID_SHIFT) & TID)			    \
	| (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
	| (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))

/******************************** Bus DMA *************************************/
int
ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
		   bus_size_t alignment, bus_size_t boundary,
		   dma_addr_t lowaddr, dma_addr_t highaddr,
		   bus_dma_filter_t *filter, void *filterarg,
		   bus_size_t maxsize, int nsegments,
		   bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
{
	bus_dma_tag_t dmat;

	dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
	if (dmat == NULL)
		return (ENOMEM);

	/*
	 * Linux is very simplistic about DMA memory.  For now don't
	 * maintain all specification information.  Once Linux supplies
	 * better facilities for doing these operations, or the
	 * needs of this particular driver change, we might need to do
	 * more here.
	 */
	dmat->alignment = alignment;
	dmat->boundary = boundary;
	dmat->maxsize = maxsize;
	*ret_tag = dmat;
	return (0);
}

void
ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
{
	free(dmat, M_DEVBUF);
}

int
ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
		 int flags, bus_dmamap_t *mapp)
{
	*vaddr = pci_alloc_consistent(ahc->dev_softc,
				      dmat->maxsize, mapp);
	if (*vaddr == NULL)
		return ENOMEM;
	return 0;
}

void
ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
		void* vaddr, bus_dmamap_t map)
{
	pci_free_consistent(ahc->dev_softc, dmat->maxsize,
			    vaddr, map);
}

int
ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
		void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
		void *cb_arg, int flags)
{
	/*
	 * Assume for now that this will only be used during
	 * initialization and not for per-transaction buffer mapping.
	 */
	bus_dma_segment_t stack_sg;

	stack_sg.ds_addr = map;
	stack_sg.ds_len = dmat->maxsize;
	cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
	return (0);
}

void
ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
{
}

int
ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
{
	/* Nothing to do */
	return (0);
}

static void
ahc_linux_setup_tag_info_global(char *p)
{
	int tags, i, j;

	tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
	printf("Setting Global Tags= %d\n", tags);

	for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
		for (j = 0; j < AHC_NUM_TARGETS; j++) {
			aic7xxx_tag_info[i].tag_commands[j] = tags;
		}
	}
}

static void
ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
{

	if ((instance >= 0) && (targ >= 0)
	 && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
	 && (targ < AHC_NUM_TARGETS)) {
		aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
		if (bootverbose)
			printf("tag_info[%d:%d] = %d\n", instance, targ, value);
	}
}

static char *
ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
		       void (*callback)(u_long, int, int, int32_t),
		       u_long callback_arg)
{
	char	*tok_end;
	char	*tok_end2;
	int      i;
	int      instance;
	int	 targ;
	int	 done;
	char	 tok_list[] = {'.', ',', '{', '}', '\0'};

	/* All options use a ':' name/arg separator */
	if (*opt_arg != ':')
		return (opt_arg);
	opt_arg++;
	instance = -1;
	targ = -1;
	done = FALSE;
	/*
	 * Restore separator that may be in
	 * the middle of our option argument.
	 */
	tok_end = strchr(opt_arg, '\0');