arch/mips/pci/ops-bonito64.c

   1 /*
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 1999, 2000 MIPS Technologies, Inc.  All rights reserved.
   4  *
   5  *  This program is free software; you can distribute it and/or modify it
   6  *  under the terms of the GNU General Public License (Version 2) as
   7  *  published by the Free Software Foundation.
   8  *
   9  *  This program is distributed in the hope it will be useful, but WITHOUT
  10  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  *  for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License along
  15  *  with this program; if not, write to the Free Software Foundation, Inc.,
  16  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  17  *
  18  * MIPS boards specific PCI support.
  19  */
  20 #include <linux/config.h>
  21 #include <linux/types.h>
  22 #include <linux/pci.h>
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25
  26 #include <asm/mips-boards/bonito64.h>
  27
  28 #define PCI_ACCESS_READ  0
  29 #define PCI_ACCESS_WRITE 1
  30
  31 /*
  32  *  PCI configuration cycle AD bus definition
  33  */
  34 /* Type 0 */
  35 #define PCI_CFG_TYPE0_REG_SHF           0
  36 #define PCI_CFG_TYPE0_FUNC_SHF          8
  37
  38 /* Type 1 */
  39 #define PCI_CFG_TYPE1_REG_SHF           0
  40 #define PCI_CFG_TYPE1_FUNC_SHF          8
  41 #define PCI_CFG_TYPE1_DEV_SHF           11
  42 #define PCI_CFG_TYPE1_BUS_SHF           16
  43
  44 static int bonito64_pcibios_config_access(unsigned char access_type,
  45                                       struct pci_bus *bus,
  46                                       unsigned int devfn, int where,
  47                                       u32 * data)
  48 {
  49         unsigned char busnum = bus->number;
  50         u32 dummy;
  51         u64 pci_addr;
  52
  53         /* Algorithmics Bonito64 system controller. */
  54
  55         if ((busnum == 0) && (PCI_SLOT(devfn) > 21)) {
  56                 /* We number bus 0 devices from 0..21 */
  57                 return -1;
  58         }
  59
  60 #ifdef CONFIG_MIPS_BOARDS_GEN
  61         if ((busnum == 0) && (PCI_SLOT(devfn) == 17)) {
  62                 /* MIPS Core boards have Bonito connected as device 17 */
  63                 return -1;
  64         }
  65 #endif
  66
  67         /* Clear cause register bits */
  68         BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
  69                           BONITO_PCICMD_MTABORT_CLR);
  70
  71         /*
  72          * Setup pattern to be used as PCI "address" for
  73          * Type 0 cycle
  74          */
  75         if (busnum == 0) {
  76                 /* IDSEL */
  77                 pci_addr = (u64) 1 << (PCI_SLOT(devfn) + 10);
  78         } else {
  79                 /* Bus number */
  80                 pci_addr = busnum << PCI_CFG_TYPE1_BUS_SHF;
  81
  82                 /* Device number */
  83                 pci_addr |=
  84                     PCI_SLOT(devfn) << PCI_CFG_TYPE1_DEV_SHF;
  85         }
  86
  87         /* Function (same for Type 0/1) */
  88         pci_addr |= PCI_FUNC(devfn) << PCI_CFG_TYPE0_FUNC_SHF;
  89
  90         /* Register number (same for Type 0/1) */
  91         pci_addr |= (where & ~0x3) << PCI_CFG_TYPE0_REG_SHF;
  92
  93         if (busnum == 0) {
  94                 /* Type 0 */
  95                 BONITO_PCIMAP_CFG = pci_addr >> 16;
  96         } else {
  97                 /* Type 1 */
  98                 BONITO_PCIMAP_CFG = (pci_addr >> 16) | 0x10000;
  99         }
 100
 101         pci_addr &= 0xffff;
 102
 103         /* Flush Bonito register block */
 104         dummy = BONITO_PCIMAP_CFG;
 105         iob();          /* sync */
 106
 107         /* Perform access */
 108         if (access_type == PCI_ACCESS_WRITE) {
 109                 *(volatile u32 *) (_pcictrl_bonito_pcicfg + (u32)pci_addr) = *(u32 *) data;
 110
 111                 /* Wait till done */
 112                 while (BONITO_PCIMSTAT & 0xF);
 113         } else {
 114                 *(u32 *) data = *(volatile u32 *) (_pcictrl_bonito_pcicfg + (u32)pci_addr);
 115         }
 116
 117         /* Detect Master/Target abort */
 118         if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
 119                              BONITO_PCICMD_MTABORT_CLR)) {
 120                 /* Error occurred */
 121
 122                 /* Clear bits */
 123                 BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
 124                                   BONITO_PCICMD_MTABORT_CLR);
 125
 126                 return -1;
 127         }
 128
 129         return 0;
 130 }
 131
 132
 133 /*
 134  * We can't address 8 and 16 bit words directly.  Instead we have to
 135  * read/write a 32bit word and mask/modify the data we actually want.
 136  */
 137 static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 138                              int where, int size, u32 * val)
 139 {
 140         u32 data = 0;
 141
 142         if ((size == 2) && (where & 1))
 143                 return PCIBIOS_BAD_REGISTER_NUMBER;
 144         else if ((size == 4) && (where & 3))
 145                 return PCIBIOS_BAD_REGISTER_NUMBER;
 146
 147         if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
 148                                        &data))
 149                 return -1;
 150
 151         if (size == 1)
 152                 *val = (data >> ((where & 3) << 3)) & 0xff;
 153         else if (size == 2)
 154                 *val = (data >> ((where & 3) << 3)) & 0xffff;
 155         else
 156                 *val = data;
 157
 158         return PCIBIOS_SUCCESSFUL;
 159 }
 160
 161 static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 162                               int where, int size, u32 val)
 163 {
 164         u32 data = 0;
 165
 166         if ((size == 2) && (where & 1))
 167                 return PCIBIOS_BAD_REGISTER_NUMBER;
 168         else if ((size == 4) && (where & 3))
 169                 return PCIBIOS_BAD_REGISTER_NUMBER;
 170
 171         if (size == 4)
 172                 data = val;
 173         else {
 174                 if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
 175                                                where, &data))
 176                         return -1;
 177
 178                 if (size == 1)
 179                         data = (data & ~(0xff << ((where & 3) << 3))) |
 180                                 (val << ((where & 3) << 3));
 181                 else if (size == 2)
 182                         data = (data & ~(0xffff << ((where & 3) << 3))) |
 183                                 (val << ((where & 3) << 3));
 184         }
 185
 186         if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
 187                                        &data))
 188                 return -1;
 189
 190         return PCIBIOS_SUCCESSFUL;
 191 }
 192
 193 struct pci_ops bonito64_pci_ops = {
 194         .read = bonito64_pcibios_read,
 195         .write = bonito64_pcibios_write
 196 };