[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: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 57 insertions, 4 deletions

diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c
index 2eb75cd74a96..4dc2e73298fd 100644
--- a/drivers/ata/pata_sil680.c
+++ b/drivers/ata/pata_sil680.c
@@ -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