Commit 2b9e68f7 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt Committed by Jeff Garzik
Browse files

[libata] pata_sil680: Add MMIO support 



This patch adds MMIO support to the pata_sil680 for taskfile IOs,
based on what the old siimage does.

I haven't bothered changing the chip setup stuff from PCI config
cycles to MMIO though (siimage does it), I don't think it matters,
I've only adapted it to use MMIO for taskfile accesses.

I've tested it on a Cell blade and it seems to work fine.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent f4921aff

drivers/ata/pata_sil680.c

+57 −4
Original line number Diff line number Diff line
@@ -279,7 +279,7 @@ static struct ata_port_operations sil680_port_ops = { 
 *	Returns the final clock settings.

 */



static u8 sil680_init_chip(struct pci_dev *pdev)

static u8 sil680_init_chip(struct pci_dev *pdev, int *try_mmio)

{

	u32 class_rev	= 0;

	u8 tmpbyte	= 0;
@@ -297,6 +297,8 @@ static u8 sil680_init_chip(struct pci_dev *pdev) 
	dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",

		tmpbyte & 1, tmpbyte & 0x30);



	*try_mmio = (tmpbyte & 1) || pci_resource_start(pdev, 5);



	switch(tmpbyte & 0x30) {

		case 0x00:

			/* 133 clock attempt to force it on */
@@ -361,25 +363,76 @@ static int __devinit sil680_init_one(struct pci_dev *pdev, 
	};

	const struct ata_port_info *ppi[] = { &info, NULL };

	static int printed_version;

	struct ata_host *host;

	void __iomem *mmio_base;

	int rc, try_mmio;



	if (!printed_version++)

		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");



	switch(sil680_init_chip(pdev))

	{

	switch (sil680_init_chip(pdev, &try_mmio)) {

		case 0:

			ppi[0] = &info_slow;

			break;

		case 0x30:

			return -ENODEV;

	}



	if (!try_mmio)

		goto use_ioports;



	/* Try to acquire MMIO resources and fallback to PIO if

	 * that fails

	 */

	rc = pcim_enable_device(pdev);

	if (rc)

		return rc;

	rc = pcim_iomap_regions(pdev, 1 << SIL680_MMIO_BAR, DRV_NAME);

	if (rc)

		goto use_ioports;



	/* Allocate host and set it up */

	host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);

	if (!host)

		return -ENOMEM;

	host->iomap = pcim_iomap_table(pdev);



	/* Setup DMA masks */

	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);

	if (rc)

		return rc;

	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);

	if (rc)

		return rc;

	pci_set_master(pdev);



	/* Get MMIO base and initialize port addresses */

	mmio_base = host->iomap[SIL680_MMIO_BAR];

	host->ports[0]->ioaddr.bmdma_addr = mmio_base + 0x00;

	host->ports[0]->ioaddr.cmd_addr = mmio_base + 0x80;

	host->ports[0]->ioaddr.ctl_addr = mmio_base + 0x8a;

	host->ports[0]->ioaddr.altstatus_addr = mmio_base + 0x8a;

	ata_std_ports(&host->ports[0]->ioaddr);

	host->ports[1]->ioaddr.bmdma_addr = mmio_base + 0x08;

	host->ports[1]->ioaddr.cmd_addr = mmio_base + 0xc0;

	host->ports[1]->ioaddr.ctl_addr = mmio_base + 0xca;

	host->ports[1]->ioaddr.altstatus_addr = mmio_base + 0xca;

	ata_std_ports(&host->ports[1]->ioaddr);



	/* Register & activate */

	return ata_host_activate(host, pdev->irq, ata_interrupt, IRQF_SHARED,

				 &sil680_sht);



use_ioports:

	return ata_pci_init_one(pdev, ppi);

}



#ifdef CONFIG_PM

static int sil680_reinit_one(struct pci_dev *pdev)

{

	sil680_init_chip(pdev);

	int try_mmio;



	sil680_init_chip(pdev, &try_mmio);

	return ata_pci_device_resume(pdev);

}

#endif

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