sgiioc4.c

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		printk(KERN_ERR
		       "%s(%s) -- ERROR, Unable to map addresses 0x%lx to 0x%lx\n",
		       __FUNCTION__, hwif->name, dma_base, dma_base + num_ports - 1);
		goto dma_remap_failure;
	}
	hwif->dma_base = (unsigned long) virt_dma_base;

	hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
					  IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
					  &hwif->dmatable_dma);

	if (!hwif->dmatable_cpu)
		goto dma_pci_alloc_failure;

	hwif->sg_max_nents = IOC4_PRD_ENTRIES;

	pad = pci_alloc_consistent(hwif->pci_dev, IOC4_IDE_CACHELINE_SIZE,
				   (dma_addr_t *) &(hwif->dma_status));

	if (pad) {
		ide_set_hwifdata(hwif, pad);
		return 0;
	}

	pci_free_consistent(hwif->pci_dev,
			    IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
			    hwif->dmatable_cpu, hwif->dmatable_dma);
	printk(KERN_INFO
	       "%s() -- Error! Unable to allocate DMA Maps for drive %s\n",
	       __FUNCTION__, hwif->name);
	printk(KERN_INFO
	       "Changing from DMA to PIO mode for Drive %s\n", hwif->name);

dma_pci_alloc_failure:
	iounmap(virt_dma_base);

dma_remap_failure:
	release_mem_region(dma_base, num_ports);

	return -1;
}

/* Initializes the IOC4 DMA Engine */
static void
sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
{
	u32 ioc4_dma;
	ide_hwif_t *hwif = HWIF(drive);
	unsigned long dma_base = hwif->dma_base;
	unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
	u32 dma_addr, ending_dma_addr;

	ioc4_dma = readl((void __iomem *)ioc4_dma_addr);

	if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
		printk(KERN_WARNING
			"%s(%s):Warning!! DMA from previous transfer was still active\n",
		       __FUNCTION__, drive->name);
		writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
		ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);

		if (ioc4_dma & IOC4_S_DMA_STOP)
			printk(KERN_ERR
			       "%s(%s) : IOC4 Dma STOP bit is still 1\n",
			       __FUNCTION__, drive->name);
	}

	ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
	if (ioc4_dma & IOC4_S_DMA_ERROR) {
		printk(KERN_WARNING
		       "%s(%s) : Warning!! - DMA Error during Previous"
		       " transfer | status 0x%x\n",
		       __FUNCTION__, drive->name, ioc4_dma);
		writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
		ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);

		if (ioc4_dma & IOC4_S_DMA_STOP)
			printk(KERN_ERR
			       "%s(%s) : IOC4 DMA STOP bit is still 1\n",
			       __FUNCTION__, drive->name);
	}

	/* Address of the Scatter Gather List */
	dma_addr = cpu_to_le32(hwif->dmatable_dma);
	writel(dma_addr, (void __iomem *)(dma_base + IOC4_DMA_PTR_L * 4));

	/* Address of the Ending DMA */
	memset(ide_get_hwifdata(hwif), 0, IOC4_IDE_CACHELINE_SIZE);
	ending_dma_addr = cpu_to_le32(hwif->dma_status);
	writel(ending_dma_addr, (void __iomem *)(dma_base + IOC4_DMA_END_ADDR * 4));

	writel(dma_direction, (void __iomem *)ioc4_dma_addr);
	drive->waiting_for_dma = 1;
}

/* IOC4 Scatter Gather list Format 					 */
/* 128 Bit entries to support 64 bit addresses in the future		 */
/* The Scatter Gather list Entry should be in the BIG-ENDIAN Format	 */
/* --------------------------------------------------------------------- */
/* | Upper 32 bits - Zero           |	 	Lower 32 bits- address | */
/* --------------------------------------------------------------------- */
/* | Upper 32 bits - Zero	    |EOL| 15 unused     | 16 Bit Length| */
/* --------------------------------------------------------------------- */
/* Creates the scatter gather list, DMA Table */
static unsigned int
sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
{
	ide_hwif_t *hwif = HWIF(drive);
	unsigned int *table = hwif->dmatable_cpu;
	unsigned int count = 0, i = 1;
	struct scatterlist *sg;

	hwif->sg_nents = i = ide_build_sglist(drive, rq);

	if (!i)
		return 0;	/* sglist of length Zero */

	sg = hwif->sg_table;
	while (i && sg_dma_len(sg)) {
		dma_addr_t cur_addr;
		int cur_len;
		cur_addr = sg_dma_address(sg);
		cur_len = sg_dma_len(sg);

		while (cur_len) {
			if (count++ >= IOC4_PRD_ENTRIES) {
				printk(KERN_WARNING
				       "%s: DMA table too small\n",
				       drive->name);
				goto use_pio_instead;
			} else {
				u32 bcount =
				    0x10000 - (cur_addr & 0xffff);

				if (bcount > cur_len)
					bcount = cur_len;

				/* put the addr, length in
				 * the IOC4 dma-table format */
				*table = 0x0;
				table++;
				*table = cpu_to_be32(cur_addr);
				table++;
				*table = 0x0;
				table++;

				*table = cpu_to_be32(bcount);
				table++;

				cur_addr += bcount;
				cur_len -= bcount;
			}
		}

		sg = sg_next(sg);
		i--;
	}

	if (count) {
		table--;
		*table |= cpu_to_be32(0x80000000);
		return count;
	}

use_pio_instead:
	pci_unmap_sg(hwif->pci_dev, hwif->sg_table, hwif->sg_nents,
		     hwif->sg_dma_direction);

	return 0;		/* revert to PIO for this request */
}

static int sgiioc4_ide_dma_setup(ide_drive_t *drive)
{
	struct request *rq = HWGROUP(drive)->rq;
	unsigned int count = 0;
	int ddir;

	if (rq_data_dir(rq))
		ddir = PCI_DMA_TODEVICE;
	else
		ddir = PCI_DMA_FROMDEVICE;

	if (!(count = sgiioc4_build_dma_table(drive, rq, ddir))) {
		/* try PIO instead of DMA */
		ide_map_sg(drive, rq);
		return 1;
	}

	if (rq_data_dir(rq))
		/* Writes TO the IOC4 FROM Main Memory */
		ddir = IOC4_DMA_READ;
	else
		/* Writes FROM the IOC4 TO Main Memory */
		ddir = IOC4_DMA_WRITE;

	sgiioc4_configure_for_dma(ddir, drive);

	return 0;
}

static void __devinit
ide_init_sgiioc4(ide_hwif_t * hwif)
{
	hwif->mmio = 1;
	hwif->pio_mask = 0x00;
	hwif->set_pio_mode = NULL; /* Sets timing for PIO mode */
	hwif->set_dma_mode = &sgiioc4_set_dma_mode;
	hwif->selectproc = NULL;/* Use the default routine to select drive */
	hwif->reset_poll = NULL;/* No HBA specific reset_poll needed */
	hwif->pre_reset = NULL;	/* No HBA specific pre_set needed */
	hwif->resetproc = &sgiioc4_resetproc;/* Reset DMA engine,
						clear interrupts */
	hwif->intrproc = NULL;	/* Enable or Disable interrupt from drive */
	hwif->maskproc = &sgiioc4_maskproc;	/* Mask on/off NIEN register */
	hwif->quirkproc = NULL;
	hwif->busproc = NULL;

	hwif->INB = &sgiioc4_INB;

	if (hwif->dma_base == 0)
		return;

	hwif->mwdma_mask = ATA_MWDMA2_ONLY;

	hwif->dma_setup = &sgiioc4_ide_dma_setup;
	hwif->dma_start = &sgiioc4_ide_dma_start;
	hwif->ide_dma_end = &sgiioc4_ide_dma_end;
	hwif->ide_dma_on = &sgiioc4_ide_dma_on;
	hwif->dma_off_quietly = &sgiioc4_dma_off_quietly;
	hwif->ide_dma_test_irq = &sgiioc4_ide_dma_test_irq;
	hwif->dma_host_on = &sgiioc4_dma_host_on;
	hwif->dma_host_off = &sgiioc4_dma_host_off;
	hwif->dma_lost_irq = &sgiioc4_dma_lost_irq;
	hwif->dma_timeout = &ide_dma_timeout;
}

static int __devinit
sgiioc4_ide_setup_pci_device(struct pci_dev *dev)
{
	unsigned long cmd_base, dma_base, irqport;
	unsigned long bar0, cmd_phys_base, ctl;
	void __iomem *virt_base;
	ide_hwif_t *hwif;
	int h;
	u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };

	/*
	 * Find an empty HWIF; if none available, return -ENOMEM.
	 */
	for (h = 0; h < MAX_HWIFS; ++h) {
		hwif = &ide_hwifs[h];
		if (hwif->chipset == ide_unknown)
			break;
	}
	if (h == MAX_HWIFS) {
		printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n",
				DRV_NAME);
		return -ENOMEM;
	}

	/*  Get the CmdBlk and CtrlBlk Base Registers */
	bar0 = pci_resource_start(dev, 0);
	virt_base = ioremap(bar0, pci_resource_len(dev, 0));
	if (virt_base == NULL) {
		printk(KERN_ERR "%s: Unable to remap BAR 0 address: 0x%lx\n",
				DRV_NAME, bar0);
		return -ENOMEM;
	}
	cmd_base = (unsigned long) virt_base + IOC4_CMD_OFFSET;
	ctl = (unsigned long) virt_base + IOC4_CTRL_OFFSET;
	irqport = (unsigned long) virt_base + IOC4_INTR_OFFSET;
	dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;

	cmd_phys_base = bar0 + IOC4_CMD_OFFSET;
	if (!request_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE,
	    hwif->name)) {
		printk(KERN_ERR
			"%s : %s -- ERROR, Addresses "
			"0x%p to 0x%p ALREADY in use\n",
		       __FUNCTION__, hwif->name, (void *) cmd_phys_base,
		       (void *) cmd_phys_base + IOC4_CMD_CTL_BLK_SIZE);
		return -ENOMEM;
	}

	if (hwif->io_ports[IDE_DATA_OFFSET] != cmd_base) {
		hw_regs_t hw;

		/* Initialize the IO registers */
		memset(&hw, 0, sizeof(hw));
		sgiioc4_init_hwif_ports(&hw, cmd_base, ctl, irqport);
		memcpy(hwif->io_ports, hw.io_ports, sizeof(hwif->io_ports));
		hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
	}

	hwif->irq = dev->irq;
	hwif->chipset = ide_pci;
	hwif->pci_dev = dev;
	hwif->channel = 0;	/* Single Channel chip */
	hwif->gendev.parent = &dev->dev;/* setup proper ancestral information */

	/* The IOC4 uses MMIO rather than Port IO. */
	default_hwif_mmiops(hwif);

	/* Initializing chipset IRQ Registers */
	writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));

	if (dma_base == 0 || ide_dma_sgiioc4(hwif, dma_base))
		printk(KERN_INFO "%s: %s Bus-Master DMA disabled\n",
				 hwif->name, DRV_NAME);

	ide_init_sgiioc4(hwif);

	idx[0] = hwif->index;

	if (ide_device_add(idx))
		return -EIO;

	return 0;
}

static unsigned int __devinit
pci_init_sgiioc4(struct pci_dev *dev)
{
	int ret;

	printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
			 DRV_NAME, pci_name(dev), dev->revision);

	if (dev->revision < IOC4_SUPPORTED_FIRMWARE_REV) {
		printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
				"firmware is obsolete - please upgrade to "
				"revision46 or higher\n",
				DRV_NAME, pci_name(dev));
		ret = -EAGAIN;
		goto out;
	}
	ret = sgiioc4_ide_setup_pci_device(dev);
out:
	return ret;
}

int
ioc4_ide_attach_one(struct ioc4_driver_data *idd)
{
	/* PCI-RT does not bring out IDE connection.
	 * Do not attach to this particular IOC4.
	 */
	if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
		return 0;

	return pci_init_sgiioc4(idd->idd_pdev);
}

static struct ioc4_submodule ioc4_ide_submodule = {
	.is_name = "IOC4_ide",
	.is_owner = THIS_MODULE,
	.is_probe = ioc4_ide_attach_one,
/*	.is_remove = ioc4_ide_remove_one,	*/
};

static int __init ioc4_ide_init(void)
{
	return ioc4_register_submodule(&ioc4_ide_submodule);
}

late_initcall(ioc4_ide_init); /* Call only after IDE init is done */

MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");
MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
MODULE_LICENSE("GPL");