libata: convert native PCI host handling to new init model

Convert native PCI host handling to alloc-init-register model.  New
function ata_pci_init_native_host() follows the new init model and
replaces ata_pci_init_native_mode().  As there are remaining LLD
users, the old function isn't removed yet.

ata_pci_init_one() is reimplemented using the new function and now
fully converted to new init model.

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

1 files changed, 101 insertions, 50 deletions

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index d48e1544a0bb..d551fa1cb104 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -678,6 +678,70 @@ static int ata_pci_init_bmdma(struct ata_host *host)
         return 0;
 }
 
+/**
+ *      ata_pci_init_native_host - acquire native ATA resources and init host
+ *      @host: target ATA host
+ *      @port_mask: ports to consider
+ *
+ *      Acquire native PCI ATA resources for @host and initialize
+ *      @host accordoingly.
+ *
+ *      LOCKING:
+ *      Inherited from calling layer (may sleep).
+ *
+ *      RETURNS:
+ *      0 on success, -errno otherwise.
+ */
+int ata_pci_init_native_host(struct ata_host *host, unsigned int port_mask)
+{
+        struct device *gdev = host->dev;
+        struct pci_dev *pdev = to_pci_dev(gdev);
+        int i, rc;
+
+        /* Discard disabled ports.  Some controllers show their unused
+         * channels this way.  Disabled ports are made dummy.
+         */
+        for (i = 0; i < 2; i++) {
+                if ((port_mask & (1 << i)) && !ata_resources_present(pdev, i)) {
+                        host->ports[i]->ops = &ata_dummy_port_ops;
+                        port_mask &= ~(1 << i);
+                }
+        }
+
+        if (!port_mask) {
+                dev_printk(KERN_ERR, gdev, "no available port\n");
+                return -ENODEV;
+        }
+
+        /* request, iomap BARs and init port addresses accordingly */
+        for (i = 0; i < 2; i++) {
+                struct ata_port *ap = host->ports[i];
+                int base = i * 2;
+                void __iomem * const *iomap;
+
+                if (!(port_mask & (1 << i)))
+                        continue;
+
+                rc = pcim_iomap_regions(pdev, 0x3 << base, DRV_NAME);
+                if (rc) {
+                        dev_printk(KERN_ERR, gdev, "failed to request/iomap "
+                                   "BARs for port %d (errno=%d)\n", i, rc);
+                        if (rc == -EBUSY)
+                                pcim_pin_device(pdev);
+                        return rc;
+                }
+                host->iomap = iomap = pcim_iomap_table(pdev);
+
+                ap->ioaddr.cmd_addr = iomap[base];
+                ap->ioaddr.altstatus_addr =
+                ap->ioaddr.ctl_addr = (void __iomem *)
+                        ((unsigned long)iomap[base + 1] | ATA_PCI_CTL_OFS);
+                ata_std_ports(&ap->ioaddr);
+        }
+
+        return 0;
+}
+
 struct ata_legacy_devres {
         unsigned int    mask;
         unsigned long   cmd_port[2];
@@ -917,7 +981,6 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
                       unsigned int n_ports)
 {
         struct device *dev = &pdev->dev;
-        struct ata_probe_ent *probe_ent = NULL;
         struct ata_host *host = NULL;
         const struct ata_port_info *port[2];
         u8 mask;
@@ -943,7 +1006,7 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
 
            Checking dev->is_enabled is insufficient as this is not set at
            boot for the primary video which is BIOS enabled
-         */
+          */
 
         rc = pcim_enable_device(pdev);
         if (rc)
@@ -969,30 +1032,28 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
 #endif
         }
 
+        /* alloc and init host */
+        host = ata_host_alloc_pinfo(dev, port, 2);
+        if (!host) {
+                dev_printk(KERN_ERR, &pdev->dev,
+                           "failed to allocate ATA host\n");
+                rc = -ENOMEM;
+                goto err_out;
+        }
+
         if (!legacy_mode) {
-                rc = pci_request_regions(pdev, DRV_NAME);
-                if (rc) {
-                        pcim_pin_device(pdev);
-                        goto err_out;
-                }
+                unsigned int port_mask;
 
-                /* TODO: If we get no DMA mask we should fall back to PIO */
-                rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
-                if (rc)
-                        goto err_out;
-                rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+                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;
-
-                pci_set_master(pdev);
         } else {
                 int was_busy = 0;
 
-                rc = -ENOMEM;
-                host = ata_host_alloc_pinfo(dev, port, 2);
-                if (!host)
-                        goto err_out;
-
                 rc = ata_init_legacy_host(host, &legacy_mode, &was_busy);
                 if (was_busy)
                         pcim_pin_device(pdev);
@@ -1002,47 +1063,37 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
                 /* request respective PCI regions, may fail */
                 rc = pci_request_region(pdev, 1, DRV_NAME);
                 rc = pci_request_region(pdev, 3, DRV_NAME);
-
-                /* init bmdma */
-                ata_pci_init_bmdma(host);
-                pci_set_master(pdev);
         }
 
-        if (legacy_mode) {
+        /* init BMDMA, may fail */
+        ata_pci_init_bmdma(host);
+        pci_set_master(pdev);
+
+        /* start host and request IRQ */
+        rc = ata_host_start(host);
+        if (rc)
+                goto err_out;
+
+        if (!legacy_mode)
+                rc = devm_request_irq(dev, pdev->irq,
+                                      port_info[0]->port_ops->irq_handler,
+                                      IRQF_SHARED, DRV_NAME, host);
+        else {
                 irq_handler_t handler[2] = { host->ops->irq_handler,
                                              host->ops->irq_handler };
                 unsigned int irq_flags[2] = { IRQF_SHARED, IRQF_SHARED };
                 void *dev_id[2] = { host, host };
 
-                rc = ata_host_start(host);
-                if (rc)
-                        goto err_out;
-
                 rc = ata_request_legacy_irqs(host, handler, irq_flags, dev_id);
-                if (rc)
-                        goto err_out;
-
-                rc = ata_host_register(host, port_info[0]->sht);
-                if (rc)
-                        goto err_out;
-        } else {
-                if (n_ports == 2)
-                        probe_ent = ata_pci_init_native_mode(pdev, (struct ata_port_info **)port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
-                else
-                        probe_ent = ata_pci_init_native_mode(pdev, (struct ata_port_info **)port, ATA_PORT_PRIMARY);
-
-                if (!probe_ent) {
-                        rc = -ENOMEM;
-                        goto err_out;
-                }
+        }
+        if (rc)
+                goto err_out;
 
-                if (!ata_device_add(probe_ent)) {
-                        rc = -ENODEV;
-                        goto err_out;
-                }
+        /* register */
+        rc = ata_host_register(host, port_info[0]->sht);
+        if (rc)
+                goto err_out;
 
-                devm_kfree(dev, probe_ent);
-        }
         devres_remove_group(dev, NULL);
         return 0;