aic7xxx_osm.c

linux-2.4.29操作系统的源码

	.highmem_io		= 1,
#endif
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
	.slave_alloc		= ahc_linux_slave_alloc,
	.slave_configure	= ahc_linux_slave_configure,
	.slave_destroy		= ahc_linux_slave_destroy,
#else
	.detect			= ahc_linux_detect,
	.release		= ahc_linux_release,
	.select_queue_depths	= ahc_linux_select_queue_depth,
	.use_new_eh_code	= 1,
#endif
};

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

/*
 * In 2.4.X and above, this routine is called from a tasklet,
 * so we must re-acquire our lock prior to executing this code.
 * In all prior kernels, ahc_schedule_runq() calls this routine
 * directly and ahc_schedule_runq() is called with our lock held.
 */
static void
ahc_runq_tasklet(unsigned long data)
{
	struct ahc_softc* ahc;
	struct ahc_linux_device *dev;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
	u_long flags;
#endif

	ahc = (struct ahc_softc *)data;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
	ahc_lock(ahc, &flags);
#endif
	while ((dev = ahc_linux_next_device_to_run(ahc)) != NULL) {
	
		TAILQ_REMOVE(&ahc->platform_data->device_runq, dev, links);
		dev->flags &= ~AHC_DEV_ON_RUN_LIST;
		ahc_linux_check_device_queue(ahc, dev);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
		/* Yeild to our interrupt handler */
		ahc_unlock(ahc, &flags);
		ahc_lock(ahc, &flags);
#endif
	}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
	ahc_unlock(ahc, &flags);
#endif
}

/******************************** 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,
		   bus_addr_t lowaddr, bus_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)
{
	bus_dmamap_t map;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0)
	map = malloc(sizeof(*map), M_DEVBUF, M_NOWAIT);
	if (map == NULL)
		return (ENOMEM);
	/*
	 * Although we can dma data above 4GB, our
	 * "consistent" memory is below 4GB for
	 * space efficiency reasons (only need a 4byte
	 * address).  For this reason, we have to reset
	 * our dma mask when doing allocations.
	 */
	if (ahc->dev_softc != NULL)
		ahc_pci_set_dma_mask(ahc->dev_softc, 0xFFFFFFFF);
	*vaddr = pci_alloc_consistent(ahc->dev_softc,
				      dmat->maxsize, &map->bus_addr);
	if (ahc->dev_softc != NULL)
		ahc_pci_set_dma_mask(ahc->dev_softc,
				     ahc->platform_data->hw_dma_mask);
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0) */
	/*
	 * At least in 2.2.14, malloc is a slab allocator so all
	 * allocations are aligned.  We assume for these kernel versions
	 * that all allocations will be bellow 4Gig, physically contiguous,
	 * and accessible via DMA by the controller.
	 */
	map = NULL; /* No additional information to store */
	*vaddr = malloc(dmat->maxsize, M_DEVBUF, M_NOWAIT);
#endif
	if (*vaddr == NULL)
		return (ENOMEM);
	*mapp = map;
	return(0);
}

void
ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
		void* vaddr, bus_dmamap_t map)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0)
	pci_free_consistent(ahc->dev_softc, dmat->maxsize,
			    vaddr, map->bus_addr);
#else
	free(vaddr, M_DEVBUF);
#endif
}

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;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0)
	stack_sg.ds_addr = map->bus_addr;
#else
#define VIRT_TO_BUS(a) (uint32_t)virt_to_bus((void *)(a))
	stack_sg.ds_addr = VIRT_TO_BUS(buf);
#endif
	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)
{
	/*
	 * The map may is NULL in our < 2.3.X implementation.
	 */
	if (map != NULL)
		free(map, M_DEVBUF);
}

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

/********************* Platform Dependent Functions ***************************/
/*
 * Compare "left hand" softc with "right hand" softc, returning:
 * < 0 - lahc has a lower priority than rahc
 *   0 - Softcs are equal
 * > 0 - lahc has a higher priority than rahc
 */
int
ahc_softc_comp(struct ahc_softc *lahc, struct ahc_softc *rahc)
{
	int	value;
	int	rvalue;
	int	lvalue;

	/*
	 * Under Linux, cards are ordered as follows:
	 *	1) VLB/EISA BIOS enabled devices sorted by BIOS address.
	 *	2) PCI devices with BIOS enabled sorted by bus/slot/func.
	 *	3) All remaining VLB/EISA devices sorted by ioport.
	 *	4) All remaining PCI devices sorted by bus/slot/func.
	 */
	value = (lahc->flags & AHC_BIOS_ENABLED)
	      - (rahc->flags & AHC_BIOS_ENABLED);
	if (value != 0)
		/* Controllers with BIOS enabled have a *higher* priority */
		return (value);

	/*
	 * Same BIOS setting, now sort based on bus type.
	 * EISA and VL controllers sort together.  EISA/VL
	 * have higher priority than PCI.
	 */
	rvalue = (rahc->chip & AHC_BUS_MASK);
 	if (rvalue == AHC_VL)
		rvalue = AHC_EISA;
	lvalue = (lahc->chip & AHC_BUS_MASK);
 	if (lvalue == AHC_VL)
		lvalue = AHC_EISA;
	value = rvalue - lvalue;
	if (value != 0)
		return (value);

	/* Still equal.  Sort by BIOS address, ioport, or bus/slot/func. */
	switch (rvalue) {
#ifdef CONFIG_PCI
	case AHC_PCI:
	{
		char primary_channel;

		if (aic7xxx_reverse_scan != 0)
			value = ahc_get_pci_bus(lahc->dev_softc)
			      - ahc_get_pci_bus(rahc->dev_softc);
		else
			value = ahc_get_pci_bus(rahc->dev_softc)
			      - ahc_get_pci_bus(lahc->dev_softc);
		if (value != 0)
			break;
		if (aic7xxx_reverse_scan != 0)
			value = ahc_get_pci_slot(lahc->dev_softc)
			      - ahc_get_pci_slot(rahc->dev_softc);
		else
			value = ahc_get_pci_slot(rahc->dev_softc)
			      - ahc_get_pci_slot(lahc->dev_softc);
		if (value != 0)
			break;
		/*
		 * On multi-function devices, the user can choose
		 * to have function 1 probed before function 0.
		 * Give whichever channel is the primary channel
		 * the highest priority.
		 */
		primary_channel = (lahc->flags & AHC_PRIMARY_CHANNEL) + 'A';
		value = -1;
		if (lahc->channel == primary_channel)
			value = 1;
		break;
	}
#endif
#ifdef CONFIG_EISA
	case AHC_EISA:
		if ((rahc->flags & AHC_BIOS_ENABLED) != 0) {
			value = rahc->platform_data->bios_address
			      - lahc->platform_data->bios_address; 
		} else {
			value = rahc->bsh.ioport
			      - lahc->bsh.ioport; 
		}
		break;
#endif
	default:
		panic("ahc_softc_sort: invalid bus type");
	}
	return (value);
}

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

	if ((instance >= 0)
	 && (instance < NUM_ELEMENTS(aic7xxx_dv_settings))) {
		aic7xxx_dv_settings[instance] = value;
		if (bootverbose)
			printf("dv[%d] = %d\n", instance, value);
	}
}

/*
 * Handle Linux boot parameters. This routine allows for assigning a value
 * to a parameter with a ':' between the parameter and the value.
 * ie. aic7xxx=stpwlev:1,extended
 */
static int
aic7xxx_setup(char *s)
{
	int	i, n;
	char   *p;
	char   *end;

	static struct {
		const char *name;
		uint32_t *flag;
	} options[] = {
		{ "extended", &aic7xxx_extended },
		{ "no_reset", &aic7xxx_no_reset },
		{ "verbose", &aic7xxx_verbose },
		{ "allow_memio", &aic7xxx_allow_memio},
#ifdef AHC_DEBUG
		{ "debug", &ahc_debug },
#endif
		{ "reverse_scan", &aic7xxx_reverse_scan },
		{ "no_probe", &aic7xxx_probe_eisa_vl },
		{ "probe_eisa_vl", &aic7xxx_probe_eisa_vl },
		{ "periodic_otag", &aic7xxx_periodic_otag },
		{ "pci_parity", &aic7xxx_pci_parity },
		{ "seltime", &aic7xxx_seltime },
		{ "tag_info", NULL },
		{ "global_tag_depth", NULL },
		{ "dv", NULL }
	};

	end = strchr(s, '\0');

	/*
	 * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
	 * will never be 0 in this case.
	 */
	n = 0;

	while ((p = strsep(&s, ",.")) != NULL) {
		if (*p == '\0')
			continue;
		for (i = 0; i < NUM_ELEMENTS(options); i++) {

			n = strlen(options[i].name);
			if (strncmp(options[i].name, p, n) == 0)
				break;
		}
		if (i == NUM_ELEMENTS(options))
			continue;

		if (strncmp(p, "global_tag_depth", n) == 0) {
			ahc_linux_setup_tag_info_global(p + n);
		} else if (strncmp(p, "tag_info", n) == 0) {
			s = aic_parse_brace_option("tag_info", p + n, end,
			    2, ahc_linux_setup_tag_info, 0);
		} else if (strncmp(p, "dv", n) == 0) {
			s = aic_parse_brace_option("dv", p + n, end, 1,
			    ahc_linux_setup_dv, 0);
		} else if (p[n] == ':') {
			*(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
		} else if (strncmp(p, "verbose", n) == 0) {
			*(options[i].flag) = 1;
		} else {
			*(options[i].flag) ^= 0xFFFFFFFF;
		}
	}
	return 1;
}

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,3,0)
__setup("aic7xxx=", aic7xxx_setup);
#endif

uint32_t aic7xxx_verbose;

int
ahc_linux_register_host(struct ahc_softc *ahc, Scsi_Host_Template *template)
{
	char	 buf[80];
	struct	 Scsi_Host *host;
	char	*new_name;
	u_long	 s;
	u_int	 targ_offset;

	template->name = ahc->description;
	host = scsi_register(template, sizeof(struct ahc_softc *));
	if (host == NULL)
		return (ENOMEM);

	*((struct ahc_softc **)host->hostdata) = ahc;
	ahc_lock(ahc, &s);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
	scsi_assign_lock(host, &ahc->platform_data->spin_lock);
#elif AHC_SCSI_HAS_HOST_LOCK != 0
	host->lock = &ahc->platform_data->spin_lock;
#endif
	ahc->platform_data->host = host;
	host->can_queue = AHC_MAX_QUEUE;
	host->cmd_per_lun = 2;
	/* XXX No way to communicate the ID for multiple channels */
	host->this_id = ahc->our_id;
	host->irq = ahc->platform_data->irq;
	host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
	host->max_lun = AHC_NUM_LUNS;
	host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
	host->sg_tablesize = AHC_NSEG;
	ahc_set_unit(ahc, ahc_linux_next_unit());
	sprintf(buf, "scsi%d", host->host_no);
	new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
	if (new_name != NULL) {
		strcpy(new_name, buf);
		ahc_set_name(ahc, new_name);
	}
	host->unique_id = ahc->unit;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,4) && \
    LINUX_VERSION_CODE  < KERNEL_VERSION(2,5,0)
	scsi_set_pci_device(host, ahc->dev_softc);
#endif
	ahc_linux_initialize_scsi_bus(ahc);