sparc64: Stop creating dummy root PCI host controller devices.

It just creates confusion, errors, and bugs.

For one thing, this can cause dup sysfs or procfs nodes to get
created:

[    1.198015] proc_dir_entry '00.0' already registered
[    1.198036] Call Trace:
[    1.198052]  [00000000004f2534] create_proc_entry+0x7c/0x98
[    1.198092]  [00000000005719e4] pci_proc_attach_device+0xa4/0xd4
[    1.198126]  [00000000007d991c] pci_proc_init+0x64/0x88
[    1.198158]  [00000000007c62a4] kernel_init+0x190/0x330
[    1.198183]  [0000000000426cf8] kernel_thread+0x38/0x48
[    1.198210]  [00000000006a0d90] rest_init+0x18/0x5c

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 33 insertions, 112 deletions

diff --git a/arch/sparc64/kernel/pci.c b/arch/sparc64/kernel/pci.c
index dbf2fc2f4d87..112b09f16f36 100644
--- a/arch/sparc64/kernel/pci.c
+++ b/arch/sparc64/kernel/pci.c
@@ -350,8 +350,7 @@ static void pci_parse_of_addrs(struct of_device *op,
 
 struct pci_dev *of_create_pci_dev(struct pci_pbm_info *pbm,
                                   struct device_node *node,
-                                  struct pci_bus *bus, int devfn,
-                                  int host_controller)
+                                  struct pci_bus *bus, int devfn)
 {
         struct dev_archdata *sd;
         struct pci_dev *dev;
@@ -390,43 +389,28 @@ struct pci_dev *of_create_pci_dev(struct pci_pbm_info *pbm,
         dev->devfn = devfn;
         dev->multifunction = 0;         /* maybe a lie? */
 
-        if (host_controller) {
-                if (tlb_type != hypervisor) {
-                        pci_read_config_word(dev, PCI_VENDOR_ID,
-                                             &dev->vendor);
-                        pci_read_config_word(dev, PCI_DEVICE_ID,
-                                             &dev->device);
-                } else {
-                        dev->vendor = PCI_VENDOR_ID_SUN;
-                        dev->device = 0x80f0;
-                }
-                dev->cfg_size = 256;
-                dev->class = PCI_CLASS_BRIDGE_HOST << 8;
-                sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(bus),
-                        0x00, PCI_SLOT(devfn), PCI_FUNC(devfn));
-        } else {
-                dev->vendor = of_getintprop_default(node, "vendor-id", 0xffff);
-                dev->device = of_getintprop_default(node, "device-id", 0xffff);
-                dev->subsystem_vendor =
-                        of_getintprop_default(node, "subsystem-vendor-id", 0);
-                dev->subsystem_device =
-                        of_getintprop_default(node, "subsystem-id", 0);
-
-                dev->cfg_size = pci_cfg_space_size(dev);
-
-                /* We can't actually use the firmware value, we have
-                 * to read what is in the register right now.  One
-                 * reason is that in the case of IDE interfaces the
-                 * firmware can sample the value before the the IDE
-                 * interface is programmed into native mode.
-                 */
-                pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
-                dev->class = class >> 8;
-                dev->revision = class & 0xff;
+        dev->vendor = of_getintprop_default(node, "vendor-id", 0xffff);
+        dev->device = of_getintprop_default(node, "device-id", 0xffff);
+        dev->subsystem_vendor =
+                of_getintprop_default(node, "subsystem-vendor-id", 0);
+        dev->subsystem_device =
+                of_getintprop_default(node, "subsystem-id", 0);
+
+        dev->cfg_size = pci_cfg_space_size(dev);
+
+        /* We can't actually use the firmware value, we have
+         * to read what is in the register right now.  One
+         * reason is that in the case of IDE interfaces the
+         * firmware can sample the value before the the IDE
+         * interface is programmed into native mode.
+         */
+        pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
+        dev->class = class >> 8;
+        dev->revision = class & 0xff;
+
+        sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(bus),
+                dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
 
-                sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(bus),
-                        dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
-        }
         if (ofpci_verbose)
                 printk("    class: 0x%x device name: %s\n",
                        dev->class, pci_name(dev));
@@ -441,26 +425,21 @@ struct pci_dev *of_create_pci_dev(struct pci_pbm_info *pbm,
         dev->current_state = 4;         /* unknown power state */
         dev->error_state = pci_channel_io_normal;
 
-        if (host_controller) {
+        if (!strcmp(type, "pci") || !strcmp(type, "pciex")) {
+                /* a PCI-PCI bridge */
                 dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
                 dev->rom_base_reg = PCI_ROM_ADDRESS1;
-                dev->irq = PCI_IRQ_NONE;
+        } else if (!strcmp(type, "cardbus")) {
+                dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;
         } else {
-                if (!strcmp(type, "pci") || !strcmp(type, "pciex")) {
-                        /* a PCI-PCI bridge */
-                        dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
-                        dev->rom_base_reg = PCI_ROM_ADDRESS1;
-                } else if (!strcmp(type, "cardbus")) {
-                        dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;
-                } else {
-                        dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
-                        dev->rom_base_reg = PCI_ROM_ADDRESS;
+                dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
+                dev->rom_base_reg = PCI_ROM_ADDRESS;
 
-                        dev->irq = sd->op->irqs[0];
-                        if (dev->irq == 0xffffffff)
-                                dev->irq = PCI_IRQ_NONE;
-                }
+                dev->irq = sd->op->irqs[0];
+                if (dev->irq == 0xffffffff)
+                        dev->irq = PCI_IRQ_NONE;
         }
+
         pci_parse_of_addrs(sd->op, node, dev);
 
         if (ofpci_verbose)
@@ -749,7 +728,7 @@ static void __devinit pci_of_scan_bus(struct pci_pbm_info *pbm,
                 prev_devfn = devfn;
 
                 /* create a new pci_dev for this device */
-                dev = of_create_pci_dev(pbm, child, bus, devfn, 0);
+                dev = of_create_pci_dev(pbm, child, bus, devfn);
                 if (!dev)
                         continue;
                 if (ofpci_verbose)
@@ -796,48 +775,9 @@ static void __devinit pci_bus_register_of_sysfs(struct pci_bus *bus)
                 pci_bus_register_of_sysfs(child_bus);
 }
 
-int pci_host_bridge_read_pci_cfg(struct pci_bus *bus_dev,
-                                 unsigned int devfn,
-                                 int where, int size,
-                                 u32 *value)
-{
-        static u8 fake_pci_config[] = {
-                0x8e, 0x10, /* Vendor: 0x108e (Sun) */
-                0xf0, 0x80, /* Device: 0x80f0 (Fire) */
-                0x46, 0x01, /* Command: 0x0146 (SERR, PARITY, MASTER, MEM) */
-                0xa0, 0x22, /* Status: 0x02a0 (DEVSEL_MED, FB2B, 66MHZ) */
-                0x00, 0x00, 0x00, 0x06, /* Class: 0x06000000 host bridge */
-                0x00, /* Cacheline: 0x00 */
-                0x40, /* Latency: 0x40 */
-                0x00, /* Header-Type: 0x00 normal */
-        };
-
-        *value = 0;
-        if (where >= 0 && where < sizeof(fake_pci_config) &&
-            (where + size) >= 0 &&
-            (where + size) < sizeof(fake_pci_config) &&
-            size <= sizeof(u32)) {
-                while (size--) {
-                        *value <<= 8;
-                        *value |= fake_pci_config[where + size];
-                }
-        }
-
-        return PCIBIOS_SUCCESSFUL;
-}
-
-int pci_host_bridge_write_pci_cfg(struct pci_bus *bus_dev,
-                                  unsigned int devfn,
-                                  int where, int size,
-                                  u32 value)
-{
-        return PCIBIOS_SUCCESSFUL;
-}
-
 struct pci_bus * __devinit pci_scan_one_pbm(struct pci_pbm_info *pbm)
 {
         struct device_node *node = pbm->prom_node;
-        struct pci_dev *host_pdev;
         struct pci_bus *bus;
 
         printk("PCI: Scanning PBM %s\n", node->full_name);
@@ -855,10 +795,6 @@ struct pci_bus * __devinit pci_scan_one_pbm(struct pci_pbm_info *pbm)
         bus->resource[0] = &pbm->io_space;
         bus->resource[1] = &pbm->mem_space;
 
-        /* Create the dummy host bridge and link it in.  */
-        host_pdev = of_create_pci_dev(pbm, node, bus, 0x00, 1);
-        bus->self = host_pdev;
-
         pci_of_scan_bus(pbm, node, bus);
         pci_bus_add_devices(bus);
         pci_bus_register_of_sysfs(bus);
diff --git a/arch/sparc64/kernel/pci_common.c b/arch/sparc64/kernel/pci_common.c
index 923e0bcc3bfd..19fa621d6a60 100644
--- a/arch/sparc64/kernel/pci_common.c
+++ b/arch/sparc64/kernel/pci_common.c
@@ -264,9 +264,6 @@ static int sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
         unsigned int func = PCI_FUNC(devfn);
         unsigned long ret;
 
-        if (!bus && devfn == 0x00)
-                return pci_host_bridge_read_pci_cfg(bus_dev, devfn, where,
-                                                    size, value);
         if (config_out_of_range(pbm, bus, devfn, where)) {
                 ret = ~0UL;
         } else {
@@ -300,9 +297,6 @@ static int sun4v_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
         unsigned int func = PCI_FUNC(devfn);
         unsigned long ret;
 
-        if (!bus && devfn == 0x00)
-                return pci_host_bridge_write_pci_cfg(bus_dev, devfn, where,
-                                                     size, value);
         if (config_out_of_range(pbm, bus, devfn, where)) {
                 /* Do nothing. */
         } else {
diff --git a/arch/sparc64/kernel/pci_impl.h b/arch/sparc64/kernel/pci_impl.h
index 218bac4ff79b..c385d126be11 100644
--- a/arch/sparc64/kernel/pci_impl.h
+++ b/arch/sparc64/kernel/pci_impl.h
@@ -167,15 +167,6 @@ extern void pci_get_pbm_props(struct pci_pbm_info *pbm);
 extern struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm);
 extern void pci_determine_mem_io_space(struct pci_pbm_info *pbm);
 
-extern int pci_host_bridge_read_pci_cfg(struct pci_bus *bus_dev,
-                                        unsigned int devfn,
-                                        int where, int size,
-                                        u32 *value);
-extern int pci_host_bridge_write_pci_cfg(struct pci_bus *bus_dev,
-                                         unsigned int devfn,
-                                         int where, int size,
-                                         u32 value);
-
 /* Error reporting support. */
 extern void pci_scan_for_target_abort(struct pci_pbm_info *, struct pci_bus *);
 extern void pci_scan_for_master_abort(struct pci_pbm_info *, struct pci_bus *);