libata: add init helpers including ata_pci_prepare_native_host()

These will be used to convert LLDs to new init model.

* Add irq_handler field to port_info.  In new init model, requesting
  IRQ is LLD's responsibility and libata doesn't need to know about
  irq_handler.  Most LLDs can simply register their irq_handler but
  some need different irq_handler depending on specific chip.  The
  added port_info->irq_handler field can be used by LLDs to select
  the matching IRQ handler in such cases.

* Add ata_dummy_port_info.

* Implement ata_pci_prepare_native_host(), a helper to alloc ATA host,
  acquire all resources and init the host in one go.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 65 insertions, 2 deletions

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index d551fa1cb104..142120cab874 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -663,13 +663,12 @@ static int ata_pci_init_bmdma(struct ata_host *host)
 
         for (i = 0; i < 2; i++) {
                 struct ata_port *ap = host->ports[i];
-                struct ata_ioports *ioaddr = &ap->ioaddr;
                 void __iomem *bmdma = host->iomap[4] + 8 * i;
 
                 if (ata_port_is_dummy(ap))
                         continue;
 
-                ioaddr->bmdma_addr = bmdma;
+                ap->ioaddr.bmdma_addr = bmdma;
                 if ((!(ap->flags & ATA_FLAG_IGN_SIMPLEX)) &&
                     (ioread8(bmdma + 2) & 0x80))
                         host->flags |= ATA_HOST_SIMPLEX;
@@ -742,6 +741,70 @@ int ata_pci_init_native_host(struct ata_host *host, unsigned int port_mask)
         return 0;
 }
 
+/**
+ *      ata_pci_prepare_native_host - helper to prepare native PCI ATA host
+ *      @pdev: target PCI device
+ *      @ppi: array of port_info
+ *      @n_ports: number of ports to allocate
+ *      @r_host: out argument for the initialized ATA host
+ *
+ *      Helper to allocate ATA host for @pdev, acquire all native PCI
+ *      resources and initialize it accordingly in one go.
+ *
+ *      LOCKING:
+ *      Inherited from calling layer (may sleep).
+ *
+ *      RETURNS:
+ *      0 on success, -errno otherwise.
+ */
+int ata_pci_prepare_native_host(struct pci_dev *pdev,
+                                const struct ata_port_info * const * ppi,
+                                int n_ports, struct ata_host **r_host)
+{
+        struct ata_host *host;
+        unsigned int port_mask;
+        int rc;
+
+        if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
+                return -ENOMEM;
+
+        host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
+        if (!host) {
+                dev_printk(KERN_ERR, &pdev->dev,
+                           "failed to allocate ATA host\n");
+                rc = -ENOMEM;
+                goto err_out;
+        }
+
+        port_mask = ATA_PORT_PRIMARY;
+        if (n_ports > 1)
+                port_mask |= ATA_PORT_SECONDARY;
+
+        rc = ata_pci_init_native_host(host, port_mask);
+        if (rc)
+                goto err_out;
+
+        /* init DMA related stuff */
+        rc = ata_pci_init_bmdma(host);
+        if (rc)
+                goto err_bmdma;
+
+        devres_remove_group(&pdev->dev, NULL);
+        *r_host = host;
+        return 0;
+
+ err_bmdma:
+        /* This is necessary because PCI and iomap resources are
+         * merged and releasing the top group won't release the
+         * acquired resources if some of those have been acquired
+         * before entering this function.
+         */
+        pcim_iounmap_regions(pdev, 0xf);
+ err_out:
+        devres_release_group(&pdev->dev, NULL);
+        return rc;
+}
+
 struct ata_legacy_devres {
         unsigned int    mask;
         unsigned long   cmd_port[2];