sym_glue.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 2,149 行 · 第 1/4 页

	scsi_host_put(instance);

	return NULL;
 }


/*
 *    Detect and try to read SYMBIOS and TEKRAM NVRAM.
 */
#if SYM_CONF_NVRAM_SUPPORT
static void __devinit sym_get_nvram(struct sym_device *devp, struct sym_nvram *nvp)
{
	devp->nvram = nvp;
	devp->device_id = devp->chip.device_id;
	nvp->type = 0;

	sym_read_nvram(devp, nvp);
}
#else
static inline void sym_get_nvram(struct sym_device *devp, struct sym_nvram *nvp)
{
}
#endif	/* SYM_CONF_NVRAM_SUPPORT */

static int __devinit sym_check_supported(struct sym_device *device)
{
	struct sym_chip *chip;
	struct pci_dev *pdev = device->pdev;
	u_char revision;
	unsigned long io_port = pci_resource_start(pdev, 0);
	int i;

	/*
	 *  If user excluded this chip, do not initialize it.
	 *  I hate this code so much.  Must kill it.
	 */
	if (io_port) {
		for (i = 0 ; i < 8 ; i++) {
			if (sym_driver_setup.excludes[i] == io_port)
				return -ENODEV;
		}
	}

	/*
	 * Check if the chip is supported.  Then copy the chip description
	 * to our device structure so we can make it match the actual device
	 * and options.
	 */
	pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);
	chip = sym_lookup_chip_table(pdev->device, revision);
	if (!chip) {
		dev_info(&pdev->dev, "device not supported\n");
		return -ENODEV;
	}
	memcpy(&device->chip, chip, sizeof(device->chip));
	device->chip.revision_id = revision;

	return 0;
}

/*
 * Ignore Symbios chips controlled by various RAID controllers.
 * These controllers set value 0x52414944 at RAM end - 16.
 */
static int __devinit sym_check_raid(struct sym_device *device)
{
	unsigned int ram_size, ram_val;

	if (!device->s.ramaddr)
		return 0;

	if (device->chip.features & FE_RAM8K)
		ram_size = 8192;
	else
		ram_size = 4096;

	ram_val = readl(device->s.ramaddr + ram_size - 16);
	if (ram_val != 0x52414944)
		return 0;

	dev_info(&device->pdev->dev,
			"not initializing, driven by RAID controller.\n");
	return -ENODEV;
}

static int __devinit sym_set_workarounds(struct sym_device *device)
{
	struct sym_chip *chip = &device->chip;
	struct pci_dev *pdev = device->pdev;
	u_short status_reg;

	/*
	 *  (ITEM 12 of a DEL about the 896 I haven't yet).
	 *  We must ensure the chip will use WRITE AND INVALIDATE.
	 *  The revision number limit is for now arbitrary.
	 */
	if (pdev->device == PCI_DEVICE_ID_NCR_53C896 && chip->revision_id < 0x4) {
		chip->features	|= (FE_WRIE | FE_CLSE);
	}

	/* If the chip can do Memory Write Invalidate, enable it */
	if (chip->features & FE_WRIE) {
		if (pci_set_mwi(pdev))
			return -ENODEV;
	}

	/*
	 *  Work around for errant bit in 895A. The 66Mhz
	 *  capable bit is set erroneously. Clear this bit.
	 *  (Item 1 DEL 533)
	 *
	 *  Make sure Config space and Features agree.
	 *
	 *  Recall: writes are not normal to status register -
	 *  write a 1 to clear and a 0 to leave unchanged.
	 *  Can only reset bits.
	 */
	pci_read_config_word(pdev, PCI_STATUS, &status_reg);
	if (chip->features & FE_66MHZ) {
		if (!(status_reg & PCI_STATUS_66MHZ))
			chip->features &= ~FE_66MHZ;
	} else {
		if (status_reg & PCI_STATUS_66MHZ) {
			status_reg = PCI_STATUS_66MHZ;
			pci_write_config_word(pdev, PCI_STATUS, status_reg);
			pci_read_config_word(pdev, PCI_STATUS, &status_reg);
		}
	}

	return 0;
}

/*
 *  Read and check the PCI configuration for any detected NCR 
 *  boards and save data for attaching after all boards have 
 *  been detected.
 */
static void __devinit
sym_init_device(struct pci_dev *pdev, struct sym_device *device)
{
	int i = 2;
	struct pci_bus_region bus_addr;

	device->host_id = SYM_SETUP_HOST_ID;
	device->pdev = pdev;

	pcibios_resource_to_bus(pdev, &bus_addr, &pdev->resource[1]);
	device->mmio_base = bus_addr.start;

	/*
	 * If the BAR is 64-bit, resource 2 will be occupied by the
	 * upper 32 bits
	 */
	if (!pdev->resource[i].flags)
		i++;
	pcibios_resource_to_bus(pdev, &bus_addr, &pdev->resource[i]);
	device->ram_base = bus_addr.start;

#ifdef CONFIG_SCSI_SYM53C8XX_MMIO
	if (device->mmio_base)
		device->s.ioaddr = pci_iomap(pdev, 1,
						pci_resource_len(pdev, 1));
#endif
	if (!device->s.ioaddr)
		device->s.ioaddr = pci_iomap(pdev, 0,
						pci_resource_len(pdev, 0));
	if (device->ram_base)
		device->s.ramaddr = pci_iomap(pdev, i,
						pci_resource_len(pdev, i));
}

/*
 * The NCR PQS and PDS cards are constructed as a DEC bridge
 * behind which sits a proprietary NCR memory controller and
 * either four or two 53c875s as separate devices.  We can tell
 * if an 875 is part of a PQS/PDS or not since if it is, it will
 * be on the same bus as the memory controller.  In its usual
 * mode of operation, the 875s are slaved to the memory
 * controller for all transfers.  To operate with the Linux
 * driver, the memory controller is disabled and the 875s
 * freed to function independently.  The only wrinkle is that
 * the preset SCSI ID (which may be zero) must be read in from
 * a special configuration space register of the 875.
 */
static void sym_config_pqs(struct pci_dev *pdev, struct sym_device *sym_dev)
{
	int slot;
	u8 tmp;

	for (slot = 0; slot < 256; slot++) {
		struct pci_dev *memc = pci_get_slot(pdev->bus, slot);

		if (!memc || memc->vendor != 0x101a || memc->device == 0x0009) {
			pci_dev_put(memc);
			continue;
		}

		/* bit 1: allow individual 875 configuration */
		pci_read_config_byte(memc, 0x44, &tmp);
		if ((tmp & 0x2) == 0) {
			tmp |= 0x2;
			pci_write_config_byte(memc, 0x44, tmp);
		}

		/* bit 2: drive individual 875 interrupts to the bus */
		pci_read_config_byte(memc, 0x45, &tmp);
		if ((tmp & 0x4) == 0) {
			tmp |= 0x4;
			pci_write_config_byte(memc, 0x45, tmp);
		}

		pci_dev_put(memc);
		break;
	}

	pci_read_config_byte(pdev, 0x84, &tmp);
	sym_dev->host_id = tmp;
}

/*
 *  Called before unloading the module.
 *  Detach the host.
 *  We have to free resources and halt the NCR chip.
 */
static int sym_detach(struct sym_hcb *np, struct pci_dev *pdev)
{
	printk("%s: detaching ...\n", sym_name(np));

	del_timer_sync(&np->s.timer);

	/*
	 * Reset NCR chip.
	 * We should use sym_soft_reset(), but we don't want to do 
	 * so, since we may not be safe if interrupts occur.
	 */
	printk("%s: resetting chip\n", sym_name(np));
	OUTB(np, nc_istat, SRST);
	INB(np, nc_mbox1);
	udelay(10);
	OUTB(np, nc_istat, 0);

	sym_free_resources(np, pdev);

	return 1;
}

/*
 * Driver host template.
 */
static struct scsi_host_template sym2_template = {
	.module			= THIS_MODULE,
	.name			= "sym53c8xx",
	.info			= sym53c8xx_info, 
	.queuecommand		= sym53c8xx_queue_command,
	.slave_alloc		= sym53c8xx_slave_alloc,
	.slave_configure	= sym53c8xx_slave_configure,
	.slave_destroy		= sym53c8xx_slave_destroy,
	.eh_abort_handler	= sym53c8xx_eh_abort_handler,
	.eh_device_reset_handler = sym53c8xx_eh_device_reset_handler,
	.eh_bus_reset_handler	= sym53c8xx_eh_bus_reset_handler,
	.eh_host_reset_handler	= sym53c8xx_eh_host_reset_handler,
	.this_id		= 7,
	.use_clustering		= ENABLE_CLUSTERING,
	.max_sectors		= 0xFFFF,
#ifdef SYM_LINUX_PROC_INFO_SUPPORT
	.proc_info		= sym53c8xx_proc_info,
	.proc_name		= NAME53C8XX,
#endif
};

static int attach_count;

static int __devinit sym2_probe(struct pci_dev *pdev,
				const struct pci_device_id *ent)
{
	struct sym_device sym_dev;
	struct sym_nvram nvram;
	struct Scsi_Host *instance;

	memset(&sym_dev, 0, sizeof(sym_dev));
	memset(&nvram, 0, sizeof(nvram));

	if (pci_enable_device(pdev))
		goto leave;

	pci_set_master(pdev);

	if (pci_request_regions(pdev, NAME53C8XX))
		goto disable;

	sym_init_device(pdev, &sym_dev);
	if (sym_check_supported(&sym_dev))
		goto free;

	if (sym_check_raid(&sym_dev))
		goto leave;	/* Don't disable the device */

	if (sym_set_workarounds(&sym_dev))
		goto free;

	sym_config_pqs(pdev, &sym_dev);

	sym_get_nvram(&sym_dev, &nvram);

	instance = sym_attach(&sym2_template, attach_count, &sym_dev);
	if (!instance)
		goto free;

	if (scsi_add_host(instance, &pdev->dev))
		goto detach;
	scsi_scan_host(instance);

	attach_count++;

	return 0;

 detach:
	sym_detach(pci_get_drvdata(pdev), pdev);
 free:
	pci_release_regions(pdev);
 disable:
	pci_disable_device(pdev);
 leave:
	return -ENODEV;
}

static void __devexit sym2_remove(struct pci_dev *pdev)
{
	struct sym_hcb *np = pci_get_drvdata(pdev);
	struct Scsi_Host *host = np->s.host;

	scsi_remove_host(host);
	scsi_host_put(host);

	sym_detach(np, pdev);

	pci_release_regions(pdev);
	pci_disable_device(pdev);

	attach_count--;
}

static void sym2_get_signalling(struct Scsi_Host *shost)
{
	struct sym_hcb *np = sym_get_hcb(shost);
	enum spi_signal_type type;

	switch (np->scsi_mode) {
	case SMODE_SE:
		type = SPI_SIGNAL_SE;
		break;
	case SMODE_LVD:
		type = SPI_SIGNAL_LVD;
		break;
	case SMODE_HVD:
		type = SPI_SIGNAL_HVD;
		break;
	default:
		type = SPI_SIGNAL_UNKNOWN;
		break;
	}
	spi_signalling(shost) = type;
}

static void sym2_set_offset(struct scsi_target *starget, int offset)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct sym_hcb *np = sym_get_hcb(shost);
	struct sym_tcb *tp = &np->target[starget->id];

	tp->tgoal.offset = offset;
	tp->tgoal.check_nego = 1;
}

static void sym2_set_period(struct scsi_target *starget, int period)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct sym_hcb *np = sym_get_hcb(shost);
	struct sym_tcb *tp = &np->target[starget->id];

	/* have to have DT for these transfers, but DT will also
	 * set width, so check that this is allowed */
	if (period <= np->minsync && spi_width(starget))
		tp->tgoal.dt = 1;

	tp->tgoal.period = period;
	tp->tgoal.check_nego = 1;
}

static void sym2_set_width(struct scsi_target *starget, int width)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct sym_hcb *np = sym_get_hcb(shost);
	struct sym_tcb *tp = &np->target[starget->id];

	/* It is illegal to have DT set on narrow transfers.  If DT is
	 * clear, we must also clear IU and QAS.  */
	if (width == 0)
		tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;

	tp->tgoal.width = width;
	tp->tgoal.check_nego = 1;
}

static void sym2_set_dt(struct scsi_target *starget, int dt)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct sym_hcb *np = sym_get_hcb(shost);
	struct sym_tcb *tp = &np->target[starget->id];

	/* We must clear QAS and IU if DT is clear */
	if (dt)
		tp->tgoal.dt = 1;
	else
		tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
	tp->tgoal.check_nego = 1;
}

#if 0
static void sym2_set_iu(struct scsi_target *starget, int iu)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct sym_hcb *np = sym_get_hcb(shost);
	struct sym_tcb *tp = &np->target[starget->id];

	if (iu)
		tp->tgoal.iu = tp->tgoal.dt = 1;
	else
		tp->tgoal.iu = 0;
	tp->tgoal.check_nego = 1;
}

static void sym2_set_qas(struct scsi_target *starget, int qas)
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct sym_hcb *np = sym_get_hcb(shost);
	struct sym_tcb *tp = &np->target[starget->id];

	if (qas)
		tp->tgoal.dt = tp->tgoal.qas = 1;
	else
		tp->tgoal.qas = 0;
	tp->tgoal.check_nego = 1;
}
#endif

static struct spi_function_template sym2_transport_functions = {
	.set_offset	= sym2_set_offset,
	.show_offset	= 1,
	.set_period	= sym2_set_period,
	.show_period	= 1,
	.set_width	= sym2_set_width,
	.show_width	= 1,
	.set_dt		= sym2_set_dt,
	.show_dt	= 1,
#if 0
	.set_iu		= sym2_set_iu,
	.show_iu	= 1,
	.set_qas	= sym2_set_qas,
	.show_qas	= 1,
#endif
	.get_signalling	= sym2_get_signalling,
};

static struct pci_device_id sym2_id_table[] __devinitdata = {
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C810,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C820,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C825,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C815,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C810AP,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C860,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1510,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C896,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C895,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C885,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C1510,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C895A,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C875A,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_33,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_66,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875J,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, sym2_id_table);

static struct pci_driver sym2_driver = {
	.name		= NAME53C8XX,
	.id_table	= sym2_id_table,
	.probe		= sym2_probe,
	.remove		= __devexit_p(sym2_remove),
};

static int __init sym2_init(void)
{
	int error;

	sym2_setup_params();
	sym2_transport_template = spi_attach_transport(&sym2_transport_functions);
	if (!sym2_transport_template)
		return -ENODEV;

	error = pci_register_driver(&sym2_driver);
	if (error)
		spi_release_transport(sym2_transport_template);
	return error;
}

static void __exit sym2_exit(void)
{
	pci_unregister_driver(&sym2_driver);
	spi_release_transport(sym2_transport_template);
}

module_init(sym2_init);
module_exit(sym2_exit);