1 files changed, 196 insertions, 0 deletions

diff --git a/arch/mips/pci/ops-bonito64.c b/arch/mips/pci/ops-bonito64.c
new file mode 100644
index 000000000000..4b4e086a7eb1
--- /dev/null
+++ b/arch/mips/pci/ops-bonito64.c
@@ -0,0 +1,196 @@
+/*
+ * 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.
+ *
+ * MIPS boards specific PCI support.
+ */
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <asm/mips-boards/bonito64.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 bonito64_pcibios_config_access(unsigned char access_type,
+                                      struct pci_bus *bus,
+                                      unsigned int devfn, int where,
+                                      u32 * data)
+{
+        unsigned char busnum = bus->number;
+        u32 dummy;
+        u64 pci_addr;
+
+        /* Algorithmics Bonito64 system controller. */
+
+        if ((busnum == 0) && (PCI_SLOT(devfn) > 21)) {
+                /* We number bus 0 devices from 0..21 */
+                return -1;
+        }
+
+#ifdef CONFIG_MIPS_BOARDS_GEN
+        if ((busnum == 0) && (PCI_SLOT(devfn) == 17)) {
+                /* MIPS Core boards have Bonito connected as device 17 */
+                return -1;
+        }
+#endif
+
+        /* Clear cause register bits */
+        BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
+                          BONITO_PCICMD_MTABORT_CLR);
+
+        /*
+         * Setup pattern to be used as PCI "address" for
+         * Type 0 cycle
+         */
+        if (busnum == 0) {
+                /* IDSEL */
+                pci_addr = (u64) 1 << (PCI_SLOT(devfn) + 10);
+        } else {
+                /* Bus number */
+                pci_addr = busnum << PCI_CFG_TYPE1_BUS_SHF;
+
+                /* Device number */
+                pci_addr |=
+                    PCI_SLOT(devfn) << PCI_CFG_TYPE1_DEV_SHF;
+        }
+
+        /* Function (same for Type 0/1) */
+        pci_addr |= PCI_FUNC(devfn) << PCI_CFG_TYPE0_FUNC_SHF;
+
+        /* Register number (same for Type 0/1) */
+        pci_addr |= (where & ~0x3) << PCI_CFG_TYPE0_REG_SHF;
+
+        if (busnum == 0) {
+                /* Type 0 */
+                BONITO_PCIMAP_CFG = pci_addr >> 16;
+        } else {
+                /* Type 1 */
+                BONITO_PCIMAP_CFG = (pci_addr >> 16) | 0x10000;
+        }
+
+        pci_addr &= 0xffff;
+
+        /* Flush Bonito register block */
+        dummy = BONITO_PCIMAP_CFG;
+        iob();          /* sync */
+
+        /* Perform access */
+        if (access_type == PCI_ACCESS_WRITE) {
+                *(volatile u32 *) (_pcictrl_bonito_pcicfg + (u32)pci_addr) = *(u32 *) data;
+
+                /* Wait till done */
+                while (BONITO_PCIMSTAT & 0xF);
+        } else {
+                *(u32 *) data = *(volatile u32 *) (_pcictrl_bonito_pcicfg + (u32)pci_addr);
+        }
+
+        /* Detect Master/Target abort */
+        if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
+                             BONITO_PCICMD_MTABORT_CLR)) {
+                /* Error occurred */
+
+                /* Clear bits */
+                BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
+                                  BONITO_PCICMD_MTABORT_CLR);
+
+                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 bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn,
+                             int where, int size, u32 * val)
+{
+        u32 data = 0;
+
+        if ((size == 2) && (where & 1))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+        else if ((size == 4) && (where & 3))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+
+        if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
+                                       &data))
+                return -1;
+
+        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 bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
+                              int where, int size, u32 val)
+{
+        u32 data = 0;
+
+        if ((size == 2) && (where & 1))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+        else if ((size == 4) && (where & 3))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+
+        if (size == 4)
+                data = val;
+        else {
+                if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
+                                               where, &data))
+                        return -1;
+
+                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 (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
+                                       &data))
+                return -1;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops bonito64_pci_ops = {
+        .read = bonito64_pcibios_read,
+        .write = bonito64_pcibios_write
+};