serverworks.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

}

static int config_chipset_for_dma (ide_drive_t *drive)
{
	u8 speed = ide_dma_speed(drive, svwks_ratemask(drive));

	if (!(speed))
		speed = XFER_PIO_0 + ide_get_best_pio_mode(drive, 255, 5, NULL);

	(void) svwks_tune_chipset(drive, speed);
	return ide_dma_enable(drive);
}

static int svwks_config_drive_xfer_rate (ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	struct hd_driveid *id	= drive->id;

	drive->init_speed = 0;

	if (id && (id->capability & 1) && drive->autodma) {
		/* Consult the list of known "bad" drives */
		if (hwif->ide_dma_bad_drive(drive))
			goto fast_ata_pio;
		if (id->field_valid & 4) {
			if (id->dma_ultra & hwif->ultra_mask) {
				/* Force if Capable UltraDMA */
				int dma = config_chipset_for_dma(drive);
				if ((id->field_valid & 2) && !dma)
					goto try_dma_modes;
			}
		} else if (id->field_valid & 2) {
try_dma_modes:
			if ((id->dma_mword & hwif->mwdma_mask) ||
			    (id->dma_1word & hwif->swdma_mask)) {
				/* Force if Capable regular DMA modes */
				if (!config_chipset_for_dma(drive))
					goto no_dma_set;
			}
		} else if (hwif->ide_dma_good_drive(drive) &&
			   (id->eide_dma_time < 150)) {
			/* Consult the list of known "good" drives */
			if (!config_chipset_for_dma(drive))
				goto no_dma_set;
		} else {
			goto no_dma_set;
		}
	} else if ((id->capability & 8) || (id->field_valid & 2)) {
fast_ata_pio:
no_dma_set:
		config_chipset_for_pio(drive);
		//	hwif->tuneproc(drive, 5);
		return hwif->ide_dma_off_quietly(drive);
	}
	return hwif->ide_dma_on(drive);
}

static int svwks_ide_dma_end (ide_drive_t *drive)
{
	/*
	 *	We never place the OSB4 into a UDMA mode with a disk
	 *	medium, that means the UDMA "all my data is 4 byte shifted"
	 *	problem cannot occur.
	 */
#if 0
	ide_hwif_t *hwif	= HWIF(drive);
	u8 dma_stat		= hwif->INB(hwif->dma_status);

	if ((dma_stat & 1) && drive->media == ide_disk)
	{
		printk(KERN_CRIT "Serverworks OSB4 in impossible state.\n");
		printk(KERN_CRIT "Disable UDMA or if you are using Seagate then try switching disk types\n");
		printk(KERN_CRIT "on this controller. Please report this event to [e-mail]\n");
		/* Panic might sys_sync -> death by corrupt disk */
		printk(KERN_CRIT "OSB4: continuing might cause disk corruption.\n");
		while(1)
			cpu_relax();
	}
#endif	
	return __ide_dma_end(drive);
}

static unsigned int __init init_chipset_svwks (struct pci_dev *dev, const char *name)
{
	unsigned int reg;
	u8 btr;

	/* save revision id to determine DMA capability */
	pci_read_config_byte(dev, PCI_REVISION_ID, &svwks_revision);

	/* force Master Latency Timer value to 64 PCICLKs */
	pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x40);

	/* OSB4 : South Bridge and IDE */
	if (dev->device == PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
		isa_dev = pci_find_device(PCI_VENDOR_ID_SERVERWORKS,
			  PCI_DEVICE_ID_SERVERWORKS_OSB4, NULL);
		if (isa_dev) {
			pci_read_config_dword(isa_dev, 0x64, &reg);
			reg &= ~0x00002000; /* disable 600ns interrupt mask */
			if(!(reg & 0x00004000))
				printk(KERN_DEBUG "%s: UDMA not BIOS enabled.\n", name);
			reg |=  0x00004000; /* enable UDMA/33 support */
			pci_write_config_dword(isa_dev, 0x64, reg);
		}
	}

	/* setup CSB5/CSB6 : South Bridge and IDE option RAID */
	else if ((dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE) ||
		 (dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
		 (dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) {
//		u32 pioreg = 0, dmareg = 0;

		/* Third Channel Test */
		if (!(PCI_FUNC(dev->devfn) & 1)) {
#if 1
			struct pci_dev * findev = NULL;
			u32 reg4c = 0;
			findev = pci_find_device(PCI_VENDOR_ID_SERVERWORKS,
				PCI_DEVICE_ID_SERVERWORKS_CSB5, NULL);
			if (findev) {
				pci_read_config_dword(findev, 0x4C, &reg4c);
				reg4c &= ~0x000007FF;
				reg4c |=  0x00000040;
				reg4c |=  0x00000020;
				pci_write_config_dword(findev, 0x4C, reg4c);
			}
#endif
			outb_p(0x06, 0x0c00);
			dev->irq = inb_p(0x0c01);
#if 0
			/* WE need to figure out how to get the correct one */
			printk("%s: interrupt %d\n", name, dev->irq);
			if (dev->irq != 0x0B)
				dev->irq = 0x0B;
#endif
#if 0
			printk("%s: device class (0x%04x)\n",
				name, dev->class);
#else
			if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE) {
				dev->class &= ~0x000F0F00;
		//		dev->class |= ~0x00000400;
				dev->class |= ~0x00010100;
				/**/
			}
#endif
		} else {
			struct pci_dev * findev = NULL;
			u8 reg41 = 0;

			findev = pci_find_device(PCI_VENDOR_ID_SERVERWORKS,
					PCI_DEVICE_ID_SERVERWORKS_CSB6, NULL);
			if (findev) {
				pci_read_config_byte(findev, 0x41, &reg41);
				reg41 &= ~0x40;
				pci_write_config_byte(findev, 0x41, reg41);
			}
			/*
			 * This is a device pin issue on CSB6.
			 * Since there will be a future raid mode,
			 * early versions of the chipset require the
			 * interrupt pin to be set, and it is a compatablity
			 * mode issue.
			 */
			dev->irq = 0;
		}
//		pci_read_config_dword(dev, 0x40, &pioreg)
//		pci_write_config_dword(dev, 0x40, 0x99999999);
//		pci_read_config_dword(dev, 0x44, &dmareg);
//		pci_write_config_dword(dev, 0x44, 0xFFFFFFFF);
		/* setup the UDMA Control register
		 *
		 * 1. clear bit 6 to enable DMA
		 * 2. enable DMA modes with bits 0-1
		 * 	00 : legacy
		 * 	01 : udma2
		 * 	10 : udma2/udma4
		 * 	11 : udma2/udma4/udma5
		 */
		pci_read_config_byte(dev, 0x5A, &btr);
		btr &= ~0x40;
		if (!(PCI_FUNC(dev->devfn) & 1))
			btr |= 0x2;
		else
			btr |= (svwks_revision >= SVWKS_CSB5_REVISION_NEW) ? 0x3 : 0x2;
		pci_write_config_byte(dev, 0x5A, btr);
	}


#if defined(DISPLAY_SVWKS_TIMINGS) && defined(CONFIG_PROC_FS)
	svwks_devs[n_svwks_devs++] = dev;

	if (!svwks_proc) {
		svwks_proc = 1;
		ide_pci_register_host_proc(&svwks_procs[0]);
	}
#endif /* DISPLAY_SVWKS_TIMINGS && CONFIG_PROC_FS */

	return (dev->irq) ? dev->irq : 0;
}

static unsigned int __init ata66_svwks_svwks (ide_hwif_t *hwif)
{
//	struct pci_dev *dev = hwif->pci_dev;
//	return 0;
	return 1;
}

/* On Dell PowerEdge servers with a CSB5/CSB6, the top two bits
 * of the subsystem device ID indicate presence of an 80-pin cable.
 * Bit 15 clear = secondary IDE channel does not have 80-pin cable.
 * Bit 15 set   = secondary IDE channel has 80-pin cable.
 * Bit 14 clear = primary IDE channel does not have 80-pin cable.
 * Bit 14 set   = primary IDE channel has 80-pin cable.
 */
static unsigned int __init ata66_svwks_dell (ide_hwif_t *hwif)
{
	struct pci_dev *dev = hwif->pci_dev;
	if (dev->subsystem_vendor == PCI_VENDOR_ID_DELL &&
	    dev->vendor	== PCI_VENDOR_ID_SERVERWORKS &&
	    (dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE ||
	     dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE))
		return ((1 << (hwif->channel + 14)) &
			dev->subsystem_device) ? 1 : 0;
	return 0;
}

/* Sun Cobalt Alpine hardware avoids the 80-pin cable
 * detect issue by attaching the drives directly to the board.
 * This check follows the Dell precedent (how scary is that?!)
 *
 * WARNING: this only works on Alpine hardware!
 */
static unsigned int __init ata66_svwks_cobalt (ide_hwif_t *hwif)
{
	struct pci_dev *dev = hwif->pci_dev;
	if (dev->subsystem_vendor == PCI_VENDOR_ID_SUN &&
	    dev->vendor	== PCI_VENDOR_ID_SERVERWORKS &&
	    dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE)
		return ((1 << (hwif->channel + 14)) &
			dev->subsystem_device) ? 1 : 0;
	return 0;
}

static unsigned int __init ata66_svwks (ide_hwif_t *hwif)
{
	struct pci_dev *dev = hwif->pci_dev;

	/* Per Specified Design by OEM, and ASIC Architect */
	if ((dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
	    (dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2))
		return 1;

	/* Server Works */
	if (dev->subsystem_vendor == PCI_VENDOR_ID_SERVERWORKS)
		return ata66_svwks_svwks (hwif);
	
	/* Dell PowerEdge */
	if (dev->subsystem_vendor == PCI_VENDOR_ID_DELL)
		return ata66_svwks_dell (hwif);

	/* Cobalt Alpine */
	if (dev->subsystem_vendor == PCI_VENDOR_ID_SUN)
		return ata66_svwks_cobalt (hwif);

	return 0;
}

#undef CAN_SW_DMA
static void __init init_hwif_svwks (ide_hwif_t *hwif)
{
	u8 dma_stat = 0;

	if (!hwif->irq)
		hwif->irq = hwif->channel ? 15 : 14;

	hwif->tuneproc = &svwks_tune_drive;
	hwif->speedproc = &svwks_tune_chipset;

	hwif->atapi_dma = 1;

	if (hwif->pci_dev->device != PCI_DEVICE_ID_SERVERWORKS_OSB4IDE)
		hwif->ultra_mask = 0x3f;

	hwif->mwdma_mask = 0x07;
#ifdef CAN_SW_DMA
	hwif->swdma_mask = 0x07;
#endif /* CAN_SW_DMA */

	hwif->autodma = 0;

	if (!hwif->dma_base) {
		hwif->drives[0].autotune = 1;
		hwif->drives[1].autotune = 1;
		return;
	}

	hwif->ide_dma_check = &svwks_config_drive_xfer_rate;
	if (hwif->pci_dev->device == PCI_DEVICE_ID_SERVERWORKS_OSB4IDE)
		hwif->ide_dma_end = &svwks_ide_dma_end;
	else if (!(hwif->udma_four))
		hwif->udma_four = ata66_svwks(hwif);
	if (!noautodma)
		hwif->autodma = 1;

	dma_stat = hwif->INB(hwif->dma_status);
	hwif->drives[0].autodma = (dma_stat & 0x20);
	hwif->drives[1].autodma = (dma_stat & 0x40);
	hwif->drives[0].autotune = (!(dma_stat & 0x20));
	hwif->drives[1].autotune = (!(dma_stat & 0x40));
//	hwif->drives[0].autodma = hwif->autodma;
//	hwif->drives[1].autodma = hwif->autodma;
}

/*
 * We allow the BM-DMA driver to only work on enabled interfaces.
 */
static void __init init_dma_svwks (ide_hwif_t *hwif, unsigned long dmabase)
{
	struct pci_dev *dev = hwif->pci_dev;

	if (((dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
	     (dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) &&
	    (!(PCI_FUNC(dev->devfn) & 1)) && (hwif->channel))
		return;

	ide_setup_dma(hwif, dmabase, 8);
}

extern void ide_setup_pci_device(struct pci_dev *, ide_pci_device_t *);

static void __init init_setup_svwks (struct pci_dev *dev, ide_pci_device_t *d)
{
	ide_setup_pci_device(dev, d);
}

static void __init init_setup_csb6 (struct pci_dev *dev, ide_pci_device_t *d)
{
	if (!(PCI_FUNC(dev->devfn) & 1)) {
		d->bootable = NEVER_BOARD;
		if (dev->resource[0].start == 0x01f1)
			d->bootable = ON_BOARD;
	} else {
		if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
			return;
	}
#if 0
	if ((IDE_PCI_DEVID_EQ(d->devid, DEVID_CSB6) &&
             (!(PCI_FUNC(dev->devfn) & 1)))
		d->autodma = AUTODMA;
#endif

	d->channels = (((d->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
			(d->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) &&
		       (!(PCI_FUNC(dev->devfn) & 1))) ? 1 : 2;

	ide_setup_pci_device(dev, d);
}


/**
 *	svwks_init_one	-	called when a OSB/CSB is found
 *	@dev: the svwks device
 *	@id: the matching pci id
 *
 *	Called when the PCI registration layer (or the IDE initialization)
 *	finds a device matching our IDE device tables.
 */
 
static int __devinit svwks_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
	ide_pci_device_t *d = &serverworks_chipsets[id->driver_data];

	if (dev->device != d->device)
		BUG();
	d->init_setup(dev, d);
	MOD_INC_USE_COUNT;
	return 0;
}

static struct pci_device_id svwks_pci_tbl[] __devinitdata = {
	{ PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4IDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB5IDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
	{ PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 2},
	{ PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 3},
	{ 0, },
};

static struct pci_driver driver = {
	.name		= "Serverworks IDE",
	.id_table	= svwks_pci_tbl,
	.probe		= svwks_init_one,
#if 0	/* FIXME: implement */
	.suspend	= ,
	.resume		= ,
#endif
};

static int svwks_ide_init(void)
{
	return ide_pci_register_driver(&driver);
}

static void svwks_ide_exit(void)
{
	ide_pci_unregister_driver(&driver);
}

module_init(svwks_ide_init);
module_exit(svwks_ide_exit);

MODULE_AUTHOR("Michael Aubry. Andrzej Krzysztofowicz, Andre Hedrick");
MODULE_DESCRIPTION("PCI driver module for Serverworks OSB4/CSB5/CSB6 IDE");
MODULE_LICENSE("GPL");

EXPORT_NO_SYMBOLS;