1 files changed, 306 insertions, 0 deletions

diff --git a/arch/mips/pci/ops-bridge.c b/arch/mips/pci/ops-bridge.c
new file mode 100644
index 000000000000..1fa09929cd7a
--- /dev/null
+++ b/arch/mips/pci/ops-bridge.c
@@ -0,0 +1,306 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999, 2000, 04, 06 Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ */
+#include <linux/pci.h>
+#include <asm/paccess.h>
+#include <asm/pci/bridge.h>
+#include <asm/sn/arch.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/sn0/hub.h>
+
+/*
+ * The Bridge ASIC supports both type 0 and type 1 access.  Type 1 is
+ * not really documented, so right now I can't write code which uses it.
+ * Therefore we use type 0 accesses for now even though they won't work
+ * correcly for PCI-to-PCI bridges.
+ *
+ * The function is complicated by the ultimate brokeness of the IOC3 chip
+ * which is used in SGI systems.  The IOC3 can only handle 32-bit PCI
+ * accesses and does only decode parts of it's address space.
+ */
+
+static int pci_conf0_read_config(struct pci_bus *bus, unsigned int devfn,
+                                 int where, int size, u32 * value)
+{
+        struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
+        bridge_t *bridge = bc->base;
+        int slot = PCI_SLOT(devfn);
+        int fn = PCI_FUNC(devfn);
+        volatile void *addr;
+        u32 cf, shift, mask;
+        int res;
+
+        addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[PCI_VENDOR_ID];
+        if (get_dbe(cf, (u32 *) addr))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't even give the
+         * generic PCI code a chance to look at it for real ...
+         */
+        if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
+                goto oh_my_gawd;
+
+        addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[where ^ (4 - size)];
+
+        if (size == 1)
+                res = get_dbe(*value, (u8 *) addr);
+        else if (size == 2)
+                res = get_dbe(*value, (u16 *) addr);
+        else
+                res = get_dbe(*value, (u32 *) addr);
+
+        return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+
+oh_my_gawd:
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't even give the
+         * generic PCI code a chance to look at the wrong register.
+         */
+        if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) {
+                *value = 0;
+                return PCIBIOS_SUCCESSFUL;
+        }
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't try to access
+         * anything but 32-bit words ...
+         */
+        addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
+
+        if (get_dbe(cf, (u32 *) addr))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        shift = ((where & 3) << 3);
+        mask = (0xffffffffU >> ((4 - size) << 3));
+        *value = (cf >> shift) & mask;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_conf1_read_config(struct pci_bus *bus, unsigned int devfn,
+                                 int where, int size, u32 * value)
+{
+        struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
+        bridge_t *bridge = bc->base;
+        int busno = bus->number;
+        int slot = PCI_SLOT(devfn);
+        int fn = PCI_FUNC(devfn);
+        volatile void *addr;
+        u32 cf, shift, mask;
+        int res;
+
+        bridge->b_pci_cfg = (busno << 16) | (slot << 11);
+        addr = &bridge->b_type1_cfg.c[(fn << 8) | PCI_VENDOR_ID];
+        if (get_dbe(cf, (u32 *) addr))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't even give the
+         * generic PCI code a chance to look at it for real ...
+         */
+        if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
+                goto oh_my_gawd;
+
+        bridge->b_pci_cfg = (busno << 16) | (slot << 11);
+        addr = &bridge->b_type1_cfg.c[(fn << 8) | (where ^ (4 - size))];
+
+        if (size == 1)
+                res = get_dbe(*value, (u8 *) addr);
+        else if (size == 2)
+                res = get_dbe(*value, (u16 *) addr);
+        else
+                res = get_dbe(*value, (u32 *) addr);
+
+        return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+
+oh_my_gawd:
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't even give the
+         * generic PCI code a chance to look at the wrong register.
+         */
+        if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) {
+                *value = 0;
+                return PCIBIOS_SUCCESSFUL;
+        }
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't try to access
+         * anything but 32-bit words ...
+         */
+        bridge->b_pci_cfg = (busno << 16) | (slot << 11);
+        addr = &bridge->b_type1_cfg.c[(fn << 8) | where];
+
+        if (get_dbe(cf, (u32 *) addr))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        shift = ((where & 3) << 3);
+        mask = (0xffffffffU >> ((4 - size) << 3));
+        *value = (cf >> shift) & mask;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_read_config(struct pci_bus *bus, unsigned int devfn,
+                           int where, int size, u32 * value)
+{
+        if (bus->number > 0)
+                return pci_conf1_read_config(bus, devfn, where, size, value);
+
+        return pci_conf0_read_config(bus, devfn, where, size, value);
+}
+
+static int pci_conf0_write_config(struct pci_bus *bus, unsigned int devfn,
+                                  int where, int size, u32 value)
+{
+        struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
+        bridge_t *bridge = bc->base;
+        int slot = PCI_SLOT(devfn);
+        int fn = PCI_FUNC(devfn);
+        volatile void *addr;
+        u32 cf, shift, mask, smask;
+        int res;
+
+        addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[PCI_VENDOR_ID];
+        if (get_dbe(cf, (u32 *) addr))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't even give the
+         * generic PCI code a chance to look at it for real ...
+         */
+        if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
+                goto oh_my_gawd;
+
+        addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[where ^ (4 - size)];
+
+        if (size == 1) {
+                res = put_dbe(value, (u8 *) addr);
+        } else if (size == 2) {
+                res = put_dbe(value, (u16 *) addr);
+        } else {
+                res = put_dbe(value, (u32 *) addr);
+        }
+
+        if (res)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        return PCIBIOS_SUCCESSFUL;
+
+oh_my_gawd:
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't even give the
+         * generic PCI code a chance to touch the wrong register.
+         */
+        if ((where >= 0x14 && where < 0x40) || (where >= 0x48))
+                return PCIBIOS_SUCCESSFUL;
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't try to access
+         * anything but 32-bit words ...
+         */
+        addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
+
+        if (get_dbe(cf, (u32 *) addr))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        shift = ((where & 3) << 3);
+        mask = (0xffffffffU >> ((4 - size) << 3));
+        smask = mask << shift;
+
+        cf = (cf & ~smask) | ((value & mask) << shift);
+        if (put_dbe(cf, (u32 *) addr))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_conf1_write_config(struct pci_bus *bus, unsigned int devfn,
+                                  int where, int size, u32 value)
+{
+        struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
+        bridge_t *bridge = bc->base;
+        int slot = PCI_SLOT(devfn);
+        int fn = PCI_FUNC(devfn);
+        int busno = bus->number;
+        volatile void *addr;
+        u32 cf, shift, mask, smask;
+        int res;
+
+        bridge->b_pci_cfg = (busno << 16) | (slot << 11);
+        addr = &bridge->b_type1_cfg.c[(fn << 8) | PCI_VENDOR_ID];
+        if (get_dbe(cf, (u32 *) addr))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't even give the
+         * generic PCI code a chance to look at it for real ...
+         */
+        if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
+                goto oh_my_gawd;
+
+        addr = &bridge->b_type1_cfg.c[(fn << 8) | (where ^ (4 - size))];
+
+        if (size == 1) {
+                res = put_dbe(value, (u8 *) addr);
+        } else if (size == 2) {
+                res = put_dbe(value, (u16 *) addr);
+        } else {
+                res = put_dbe(value, (u32 *) addr);
+        }
+
+        if (res)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        return PCIBIOS_SUCCESSFUL;
+
+oh_my_gawd:
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't even give the
+         * generic PCI code a chance to touch the wrong register.
+         */
+        if ((where >= 0x14 && where < 0x40) || (where >= 0x48))
+                return PCIBIOS_SUCCESSFUL;
+
+        /*
+         * IOC3 is fucked fucked beyond believe ...  Don't try to access
+         * anything but 32-bit words ...
+         */
+        addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
+
+        if (get_dbe(cf, (u32 *) addr))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        shift = ((where & 3) << 3);
+        mask = (0xffffffffU >> ((4 - size) << 3));
+        smask = mask << shift;
+
+        cf = (cf & ~smask) | ((value & mask) << shift);
+        if (put_dbe(cf, (u32 *) addr))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_write_config(struct pci_bus *bus, unsigned int devfn,
+        int where, int size, u32 value)
+{
+        if (bus->number > 0)
+                return pci_conf1_write_config(bus, devfn, where, size, value);
+
+        return pci_conf0_write_config(bus, devfn, where, size, value);
+}
+
+struct pci_ops bridge_pci_ops = {
+        .read   = pci_read_config,
+        .write  = pci_write_config,
+};