[MIPS] IP27: Extract pci_ops into separate file.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
git-mirror · Jun 19, 2006 · 9e0c7af · 9e0c7af
1 parent 3a11545
commit 9e0c7af
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Showing 3 changed files with 308 additions and 292 deletions.
diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
@@ -43,7 +43,7 @@ obj-$(CONFIG_MOMENCO_OCELOT_C)	+= fixup-ocelot-c.o pci-ocelot-c.o
 obj-$(CONFIG_MOMENCO_OCELOT_G)	+= fixup-ocelot-g.o pci-ocelot-g.o
 obj-$(CONFIG_PMC_YOSEMITE)	+= fixup-yosemite.o ops-titan.o ops-titan-ht.o \
 				   pci-yosemite.o
-obj-$(CONFIG_SGI_IP27)		+= pci-ip27.o
+obj-$(CONFIG_SGI_IP27)		+= ops-bridge.o pci-ip27.o
 obj-$(CONFIG_SGI_IP32)		+= fixup-ip32.o ops-mace.o pci-ip32.o
 obj-$(CONFIG_SIBYTE_SB1250)	+= fixup-sb1250.o pci-sb1250.o
 obj-$(CONFIG_SIBYTE_BCM112X)	+= fixup-sb1250.o pci-sb1250.o

diff --git a/arch/mips/pci/ops-bridge.c 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,
+};