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-rw-r--r--arch/mips/pci/ops-bridge.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-bridge.c b/arch/mips/pci/ops-bridge.c
new file mode 100644
index 000000000..a1d2c4ae0
--- /dev/null
+++ b/arch/mips/pci/ops-bridge.c
@@ -0,0 +1,322 @@
+/*
+ * 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>
+
+/*
+ * Most of the IOC3 PCI config register aren't present
+ * we emulate what is needed for a normal PCI enumeration
+ */
+static u32 emulate_ioc3_cfg(int where, int size)
+{
+ if (size == 1 && where == 0x3d)
+ return 0x01;
+ else if (size == 2 && where == 0x3c)
+ return 0x0100;
+ else if (size == 4 && where == 0x3c)
+ return 0x00000100;
+
+ return 0;
+}
+
+/*
+ * 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
+ * correctly for PCI-to-PCI bridges.
+ *
+ * The function is complicated by the ultimate brokenness 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 fucking fucked beyond belief ... 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 fucking fucked beyond belief ... Don't even give the
+ * generic PCI code a chance to look at the wrong register.
+ */
+ if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) {
+ *value = emulate_ioc3_cfg(where, size);
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ /*
+ * IOC3 is fucking fucked beyond belief ... 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 fucking fucked beyond belief ... 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 fucking fucked beyond belief ... Don't even give the
+ * generic PCI code a chance to look at the wrong register.
+ */
+ if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) {
+ *value = emulate_ioc3_cfg(where, size);
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ /*
+ * IOC3 is fucking fucked beyond belief ... 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 (!pci_is_root_bus(bus))
+ 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 fucking fucked beyond belief ... 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 fucking fucked beyond belief ... 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 fucking fucked beyond belief ... 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 fucking fucked beyond belief ... 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 fucking fucked beyond belief ... 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 fucking fucked beyond belief ... 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 (!pci_is_root_bus(bus))
+ 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,
+};
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