[SPARC64]: Add dummy host controller to root of all PCI domains.

We fake up a dummy one in all cases because that is the simplest
thing to do and it happens to be necessary for hypervisor systems.

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

6 files changed, 129 insertions, 30 deletions

diff --git a/arch/sparc64/kernel/pci.c b/arch/sparc64/kernel/pci.c
index 914a216da339..ec5f85b030ef 100644
--- a/arch/sparc64/kernel/pci.c
+++ b/arch/sparc64/kernel/pci.c
@@ -368,7 +368,8 @@ 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)
+                                  struct pci_bus *bus, int devfn,
+                                  int host_controller)
 {
         struct dev_archdata *sd;
         struct pci_dev *dev;
@@ -400,47 +401,62 @@ struct pci_dev *of_create_pci_dev(struct pci_pbm_info *pbm,
         dev->devfn = devfn;
         dev->multifunction = 0;         /* maybe a lie? */
 
-        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);
-
+        if (host_controller) {
+                dev->vendor = 0x108e;
+                dev->device = 0x8000;
+                dev->subsystem_vendor = 0x0000;
+                dev->subsystem_device = 0x0000;
+                dev->cfg_size = 256;
+        } 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);
+        }
         sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(bus),
                 dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
 
-        /* dev->class = of_getintprop_default(node, "class-code", 0); */
-        /* 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;
-
+        if (host_controller) {
+                dev->class = PCI_CLASS_BRIDGE_HOST << 8;
+        } else {
+                /* 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;
+        }
         printk("    class: 0x%x\n", dev->class);
 
         dev->current_state = 4;         /* unknown power state */
         dev->error_state = pci_channel_io_normal;
 
-        if (!strcmp(type, "pci") || !strcmp(type, "pciex")) {
-                /* a PCI-PCI bridge */
+        if (host_controller) {
                 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;
+                dev->irq = PCI_IRQ_NONE;
         } else {
-                dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
-                dev->rom_base_reg = PCI_ROM_ADDRESS;
+                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->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);
 
         printk("    adding to system ...\n");
@@ -632,7 +648,7 @@ static void __init pci_of_scan_bus(struct pci_pbm_info *pbm,
                 devfn = (reg[0] >> 8) & 0xff;
 
                 /* create a new pci_dev for this device */
-                dev = of_create_pci_dev(pbm, child, bus, devfn);
+                dev = of_create_pci_dev(pbm, child, bus, devfn, 0);
                 if (!dev)
                         continue;
                 printk("PCI: dev header type: %x\n", dev->hdr_type);
@@ -677,10 +693,49 @@ 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) */
+                0x00, 0x80, /* Device: 0x8000 (PBM) */
+                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 * __init pci_scan_one_pbm(struct pci_pbm_info *pbm)
 {
         struct pci_controller_info *p = pbm->parent;
         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);
@@ -698,6 +753,10 @@ struct pci_bus * __init 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_impl.h b/arch/sparc64/kernel/pci_impl.h
index c6714548d823..1208583fcb83 100644
--- a/arch/sparc64/kernel/pci_impl.h
+++ b/arch/sparc64/kernel/pci_impl.h
@@ -20,6 +20,15 @@ extern int pci_num_controllers;
 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_controller_info *, struct pci_pbm_info *, struct pci_bus *);
 extern void pci_scan_for_master_abort(struct pci_controller_info *, struct pci_pbm_info *, struct pci_bus *);
diff --git a/arch/sparc64/kernel/pci_psycho.c b/arch/sparc64/kernel/pci_psycho.c
index 2e5d40a26dbd..154c03290d5d 100644
--- a/arch/sparc64/kernel/pci_psycho.c
+++ b/arch/sparc64/kernel/pci_psycho.c
@@ -118,6 +118,10 @@ static int psycho_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
         u16 tmp16;
         u8 tmp8;
 
+        if (bus_dev == pbm->pci_bus && devfn == 0x00)
+                return pci_host_bridge_read_pci_cfg(bus_dev, devfn, where,
+                                                    size, value);
+
         switch (size) {
         case 1:
                 *value = 0xff;
@@ -171,6 +175,9 @@ static int psycho_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
         unsigned char bus = bus_dev->number;
         u32 *addr;
 
+        if (bus_dev == pbm->pci_bus && devfn == 0x00)
+                return pci_host_bridge_write_pci_cfg(bus_dev, devfn, where,
+                                                     size, value);
         addr = psycho_pci_config_mkaddr(pbm, bus, devfn, where);
         if (!addr)
                 return PCIBIOS_SUCCESSFUL;
diff --git a/arch/sparc64/kernel/pci_sabre.c b/arch/sparc64/kernel/pci_sabre.c
index 1bd7fc7c05e6..a2f129d29c20 100644
--- a/arch/sparc64/kernel/pci_sabre.c
+++ b/arch/sparc64/kernel/pci_sabre.c
@@ -319,6 +319,12 @@ static int __sabre_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 static int sabre_read_pci_cfg(struct pci_bus *bus, unsigned int devfn,
                               int where, int size, u32 *value)
 {
+        struct pci_pbm_info *pbm = bus->sysdata;
+
+        if (bus == pbm->pci_bus && devfn == 0x00)
+                return pci_host_bridge_read_pci_cfg(bus, devfn, where,
+                                                    size, value);
+
         if (!bus->number && sabre_out_of_range(devfn)) {
                 switch (size) {
                 case 1:
@@ -435,6 +441,12 @@ static int __sabre_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 static int sabre_write_pci_cfg(struct pci_bus *bus, unsigned int devfn,
                                int where, int size, u32 value)
 {
+        struct pci_pbm_info *pbm = bus->sysdata;
+
+        if (bus == pbm->pci_bus && devfn == 0x00)
+                return pci_host_bridge_write_pci_cfg(bus, devfn, where,
+                                                     size, value);
+
         if (bus->number)
                 return __sabre_write_pci_cfg(bus, devfn, where, size, value);
 
diff --git a/arch/sparc64/kernel/pci_schizo.c b/arch/sparc64/kernel/pci_schizo.c
index f1f105af8d3c..322cdbf50eff 100644
--- a/arch/sparc64/kernel/pci_schizo.c
+++ b/arch/sparc64/kernel/pci_schizo.c
@@ -125,6 +125,9 @@ static int schizo_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
         u16 tmp16;
         u8 tmp8;
 
+        if (bus_dev == pbm->pci_bus && devfn == 0x00)
+                return pci_host_bridge_read_pci_cfg(bus_dev, devfn, where,
+                                                    size, value);
         switch (size) {
         case 1:
                 *value = 0xff;
@@ -178,6 +181,9 @@ static int schizo_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
         unsigned char bus = bus_dev->number;
         u32 *addr;
 
+        if (bus_dev == pbm->pci_bus && devfn == 0x00)
+                return pci_host_bridge_write_pci_cfg(bus_dev, devfn, where,
+                                                     size, value);
         addr = schizo_pci_config_mkaddr(pbm, bus, devfn, where);
         if (!addr)
                 return PCIBIOS_SUCCESSFUL;
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index a8c12c1e8039..52bd4563492d 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -612,6 +612,9 @@ static int pci_sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
         unsigned int func = PCI_FUNC(devfn);
         unsigned long ret;
 
+        if (bus_dev == pbm->pci_bus && devfn == 0x00)
+                return pci_host_bridge_read_pci_cfg(bus_dev, devfn, where,
+                                                    size, value);
         if (pci_sun4v_out_of_range(pbm, bus, device, func)) {
                 ret = ~0UL;
         } else {
@@ -650,6 +653,9 @@ static int pci_sun4v_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
         unsigned int func = PCI_FUNC(devfn);
         unsigned long ret;
 
+        if (bus_dev == pbm->pci_bus && devfn == 0x00)
+                return pci_host_bridge_write_pci_cfg(bus_dev, devfn, where,
+                                                     size, value);
         if (pci_sun4v_out_of_range(pbm, bus, device, func)) {
                 /* Do nothing. */
         } else {