1 files changed, 154 insertions, 0 deletions

diff --git a/arch/mips/pci/ops-gt64120.c b/arch/mips/pci/ops-gt64120.c
new file mode 100644
index 000000000000..7b99dfa33dfc
--- /dev/null
+++ b/arch/mips/pci/ops-gt64120.c
@@ -0,0 +1,154 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 1999, 2000 MIPS Technologies, Inc.  All rights reserved.
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ */
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+
+#include <asm/gt64120.h>
+
+#define PCI_ACCESS_READ  0
+#define PCI_ACCESS_WRITE 1
+
+/*
+ *  PCI configuration cycle AD bus definition
+ */
+/* Type 0 */
+#define PCI_CFG_TYPE0_REG_SHF           0
+#define PCI_CFG_TYPE0_FUNC_SHF          8
+
+/* Type 1 */
+#define PCI_CFG_TYPE1_REG_SHF           0
+#define PCI_CFG_TYPE1_FUNC_SHF          8
+#define PCI_CFG_TYPE1_DEV_SHF           11
+#define PCI_CFG_TYPE1_BUS_SHF           16
+
+static int gt64120_pcibios_config_access(unsigned char access_type,
+        struct pci_bus *bus, unsigned int devfn, int where, u32 * data)
+{
+        unsigned char busnum = bus->number;
+        u32 intr;
+
+        if ((busnum == 0) && (PCI_SLOT(devfn) == 0))
+                /* Galileo itself is devfn 0, don't move it around */
+                return -1;
+
+        if ((busnum == 0) && (devfn >= PCI_DEVFN(31, 0)))
+                return -1;      /* Because of a bug in the galileo (for slot 31). */
+
+        /* Clear cause register bits */
+        GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT |
+                                     GT_INTRCAUSE_TARABORT0_BIT));
+
+        /* Setup address */
+        GT_WRITE(GT_PCI0_CFGADDR_OFS,
+                 (busnum << GT_PCI0_CFGADDR_BUSNUM_SHF) |
+                 (devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF) |
+                 ((where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF) |
+                 GT_PCI0_CFGADDR_CONFIGEN_BIT);
+
+        if (access_type == PCI_ACCESS_WRITE) {
+                if (busnum == 0 && PCI_SLOT(devfn) == 0) {
+                        /*
+                         * The Galileo system controller is acting
+                         * differently than other devices.
+                         */
+                        GT_WRITE(GT_PCI0_CFGDATA_OFS, *data);
+                } else
+                        __GT_WRITE(GT_PCI0_CFGDATA_OFS, *data);
+        } else {
+                if (busnum == 0 && PCI_SLOT(devfn) == 0) {
+                        /*
+                         * The Galileo system controller is acting
+                         * differently than other devices.
+                         */
+                        *data = GT_READ(GT_PCI0_CFGDATA_OFS);
+                } else
+                        *data = __GT_READ(GT_PCI0_CFGDATA_OFS);
+        }
+
+        /* Check for master or target abort */
+        intr = GT_READ(GT_INTRCAUSE_OFS);
+
+        if (intr & (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)) {
+                /* Error occurred */
+
+                /* Clear bits */
+                GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT |
+                                             GT_INTRCAUSE_TARABORT0_BIT));
+
+                return -1;
+        }
+
+        return 0;
+}
+
+
+/*
+ * We can't address 8 and 16 bit words directly.  Instead we have to
+ * read/write a 32bit word and mask/modify the data we actually want.
+ */
+static int gt64120_pcibios_read(struct pci_bus *bus, unsigned int devfn,
+                                int where, int size, u32 * val)
+{
+        u32 data = 0;
+
+        if (gt64120_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
+                                          &data))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        if (size == 1)
+                *val = (data >> ((where & 3) << 3)) & 0xff;
+        else if (size == 2)
+                *val = (data >> ((where & 3) << 3)) & 0xffff;
+        else
+                *val = data;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int gt64120_pcibios_write(struct pci_bus *bus, unsigned int devfn,
+                              int where, int size, u32 val)
+{
+        u32 data = 0;
+
+        if (size == 4)
+                data = val;
+        else {
+                if (gt64120_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
+                                                  where, &data))
+                        return PCIBIOS_DEVICE_NOT_FOUND;
+
+                if (size == 1)
+                        data = (data & ~(0xff << ((where & 3) << 3))) |
+                                (val << ((where & 3) << 3));
+                else if (size == 2)
+                        data = (data & ~(0xffff << ((where & 3) << 3))) |
+                                (val << ((where & 3) << 3));
+        }
+
+        if (gt64120_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
+                                       &data))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops gt64120_pci_ops = {
+        .read = gt64120_pcibios_read,
+        .write = gt64120_pcibios_write
+};