arch/mips/pci/pci-vr41xx.c

   1 /*
   2  *  pci-vr41xx.c, PCI Control Unit routines for the NEC VR4100 series.
   3  *
   4  *  Copyright (C) 2001-2003 MontaVista Software Inc.
   5  *    Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com>
   6  *  Copyright (C) 2004  Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22 /*
  23  * Changes:
  24  *  MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
  25  *  - New creation, NEC VR4122 and VR4131 are supported.
  26  */
  27 #include <linux/init.h>
  28 #include <linux/pci.h>
  29 #include <linux/types.h>
  30
  31 #include <asm/cpu.h>
  32 #include <asm/io.h>
  33 #include <asm/pci_channel.h>
  34 #include <asm/vr41xx/vr41xx.h>
  35
  36 #include "pci-vr41xx.h"
  37
  38 extern struct pci_ops vr41xx_pci_ops;
  39
  40 static struct pci_master_address_conversion pci_master_memory1 = {
  41         .bus_base_address       = PCI_MASTER_MEM1_BUS_BASE_ADDRESS,
  42         .address_mask           = PCI_MASTER_MEM1_ADDRESS_MASK,
  43         .pci_base_address       = PCI_MASTER_MEM1_PCI_BASE_ADDRESS,
  44 };
  45
  46 static struct pci_target_address_conversion pci_target_memory1 = {
  47         .address_mask           = PCI_TARGET_MEM1_ADDRESS_MASK,
  48         .bus_base_address       = PCI_TARGET_MEM1_BUS_BASE_ADDRESS,
  49 };
  50
  51 static struct pci_master_address_conversion pci_master_io = {
  52         .bus_base_address       = PCI_MASTER_IO_BUS_BASE_ADDRESS,
  53         .address_mask           = PCI_MASTER_IO_ADDRESS_MASK,
  54         .pci_base_address       = PCI_MASTER_IO_PCI_BASE_ADDRESS,
  55 };
  56
  57 static struct pci_mailbox_address pci_mailbox = {
  58         .base_address           = PCI_MAILBOX_BASE_ADDRESS,
  59 };
  60
  61 static struct pci_target_address_window pci_target_window1 = {
  62         .base_address           = PCI_TARGET_WINDOW1_BASE_ADDRESS,
  63 };
  64
  65 static struct resource pci_mem_resource = {
  66         .name   = "PCI Memory resources",
  67         .start  = PCI_MEM_RESOURCE_START,
  68         .end    = PCI_MEM_RESOURCE_END,
  69         .flags  = IORESOURCE_MEM,
  70 };
  71
  72 static struct resource pci_io_resource = {
  73         .name   = "PCI I/O resources",
  74         .start  = PCI_IO_RESOURCE_START,
  75         .end    = PCI_IO_RESOURCE_END,
  76         .flags  = IORESOURCE_IO,
  77 };
  78
  79 static struct pci_controller_unit_setup vr41xx_pci_controller_unit_setup = {
  80         .master_memory1                         = &pci_master_memory1,
  81         .target_memory1                         = &pci_target_memory1,
  82         .master_io                              = &pci_master_io,
  83         .exclusive_access                       = CANNOT_LOCK_FROM_DEVICE,
  84         .wait_time_limit_from_irdy_to_trdy      = 0,
  85         .mailbox                                = &pci_mailbox,
  86         .target_window1                         = &pci_target_window1,
  87         .master_latency_timer                   = 0x80,
  88         .retry_limit                            = 0,
  89         .arbiter_priority_control               = PCI_ARBITRATION_MODE_FAIR,
  90         .take_away_gnt_mode                     = PCI_TAKE_AWAY_GNT_DISABLE,
  91 };
  92
  93 static struct pci_controller vr41xx_pci_controller = {
  94         .pci_ops        = &vr41xx_pci_ops,
  95         .mem_resource   = &pci_mem_resource,
  96         .io_resource    = &pci_io_resource,
  97 };
  98
  99 void __init vr41xx_pciu_setup(struct pci_controller_unit_setup *setup)
 100 {
 101         vr41xx_pci_controller_unit_setup = *setup;
 102 }
 103
 104 static int __init vr41xx_pciu_init(void)
 105 {
 106         struct pci_controller_unit_setup *setup;
 107         struct pci_master_address_conversion *master;
 108         struct pci_target_address_conversion *target;
 109         struct pci_mailbox_address *mailbox;
 110         struct pci_target_address_window *window;
 111         unsigned long vtclock, pci_clock_max;
 112         uint32_t val;
 113
 114         setup = &vr41xx_pci_controller_unit_setup;
 115
 116         /* Disable PCI interrupt */
 117         vr41xx_disable_pciint();
 118
 119         /* Supply VTClock to PCIU */
 120         vr41xx_supply_clock(PCIU_CLOCK);
 121
 122         /* Dummy write, waiting for supply of VTClock. */
 123         vr41xx_disable_pciint();
 124
 125         /* Select PCI clock */
 126         if (setup->pci_clock_max != 0)
 127                 pci_clock_max = setup->pci_clock_max;
 128         else
 129                 pci_clock_max = PCI_CLOCK_MAX;
 130         vtclock = vr41xx_get_vtclock_frequency();
 131         if (vtclock < pci_clock_max)
 132                 writel(EQUAL_VTCLOCK, PCICLKSELREG);
 133         else if ((vtclock / 2) < pci_clock_max)
 134                 writel(HALF_VTCLOCK, PCICLKSELREG);
 135         else if (current_cpu_data.processor_id >= PRID_VR4131_REV2_1 &&
 136                  (vtclock / 3) < pci_clock_max)
 137                 writel(ONE_THIRD_VTCLOCK, PCICLKSELREG);
 138         else if ((vtclock / 4) < pci_clock_max)
 139                 writel(QUARTER_VTCLOCK, PCICLKSELREG);
 140         else {
 141                 printk(KERN_ERR "PCI Clock is over 33MHz.\n");
 142                 return -EINVAL;
 143         }
 144
 145         /* Supply PCI clock by PCI bus */
 146         vr41xx_supply_clock(PCI_CLOCK);
 147
 148         if (setup->master_memory1 != NULL) {
 149                 master = setup->master_memory1;
 150                 val = IBA(master->bus_base_address) |
 151                       MASTER_MSK(master->address_mask) |
 152                       WINEN |
 153                       PCIA(master->pci_base_address);
 154                 writel(val, PCIMMAW1REG);
 155         } else {
 156                 val = readl(PCIMMAW1REG);
 157                 val &= ~WINEN;
 158                 writel(val, PCIMMAW1REG);
 159         }
 160
 161         if (setup->master_memory2 != NULL) {
 162                 master = setup->master_memory2;
 163                 val = IBA(master->bus_base_address) |
 164                       MASTER_MSK(master->address_mask) |
 165                       WINEN |
 166                       PCIA(master->pci_base_address);
 167                 writel(val, PCIMMAW2REG);
 168         } else {
 169                 val = readl(PCIMMAW2REG);
 170                 val &= ~WINEN;
 171                 writel(val, PCIMMAW2REG);
 172         }
 173
 174         if (setup->target_memory1 != NULL) {
 175                 target = setup->target_memory1;
 176                 val = TARGET_MSK(target->address_mask) |
 177                       WINEN |
 178                       ITA(target->bus_base_address);
 179                 writel(val, PCITAW1REG);
 180         } else {
 181                 val = readl(PCITAW1REG);
 182                 val &= ~WINEN;
 183                 writel(val, PCITAW1REG);
 184         }
 185
 186         if (setup->target_memory2 != NULL) {
 187                 target = setup->target_memory2;
 188                 val = TARGET_MSK(target->address_mask) |
 189                       WINEN |
 190                       ITA(target->bus_base_address);
 191                 writel(val, PCITAW2REG);
 192         } else {
 193                 val = readl(PCITAW2REG);
 194                 val &= ~WINEN;
 195                 writel(val, PCITAW2REG);
 196         }
 197
 198         if (setup->master_io != NULL) {
 199                 master = setup->master_io;
 200                 val = IBA(master->bus_base_address) |
 201                       MASTER_MSK(master->address_mask) |
 202                       WINEN |
 203                       PCIIA(master->pci_base_address);
 204                 writel(val, PCIMIOAWREG);
 205         } else {
 206                 val = readl(PCIMIOAWREG);
 207                 val &= ~WINEN;
 208                 writel(val, PCIMIOAWREG);
 209         }
 210
 211         if (setup->exclusive_access == CANNOT_LOCK_FROM_DEVICE)
 212                 writel(UNLOCK, PCIEXACCREG);
 213         else
 214                 writel(0, PCIEXACCREG);
 215
 216         if (current_cpu_data.cputype == CPU_VR4122)
 217                 writel(TRDYV(setup->wait_time_limit_from_irdy_to_trdy), PCITRDYVREG);
 218
 219         writel(MLTIM(setup->master_latency_timer), LATTIMEREG);
 220
 221         if (setup->mailbox != NULL) {
 222                 mailbox = setup->mailbox;
 223                 val = MBADD(mailbox->base_address) | TYPE_32BITSPACE |
 224                       MSI_MEMORY | PREF_APPROVAL;
 225                 writel(val, MAILBAREG);
 226         }
 227
 228         if (setup->target_window1) {
 229                 window = setup->target_window1;
 230                 val = PMBA(window->base_address) | TYPE_32BITSPACE |
 231                       MSI_MEMORY | PREF_APPROVAL;
 232                 writel(val, PCIMBA1REG);
 233         }
 234
 235         if (setup->target_window2) {
 236                 window = setup->target_window2;
 237                 val = PMBA(window->base_address) | TYPE_32BITSPACE |
 238                       MSI_MEMORY | PREF_APPROVAL;
 239                 writel(val, PCIMBA2REG);
 240         }
 241
 242         val = readl(RETVALREG);
 243         val &= ~RTYVAL_MASK;
 244         val |= RTYVAL(setup->retry_limit);
 245         writel(val, RETVALREG);
 246
 247         val = readl(PCIAPCNTREG);
 248         val &= ~(TKYGNT | PAPC);
 249
 250         switch (setup->arbiter_priority_control) {
 251         case PCI_ARBITRATION_MODE_ALTERNATE_0:
 252                 val |= PAPC_ALTERNATE_0;
 253                 break;
 254         case PCI_ARBITRATION_MODE_ALTERNATE_B:
 255                 val |= PAPC_ALTERNATE_B;
 256                 break;
 257         default:
 258                 val |= PAPC_FAIR;
 259                 break;
 260         }
 261
 262         if (setup->take_away_gnt_mode == PCI_TAKE_AWAY_GNT_ENABLE)
 263                 val |= TKYGNT_ENABLE;
 264
 265         writel(val, PCIAPCNTREG);
 266
 267         writel(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 268                PCI_COMMAND_PARITY | PCI_COMMAND_SERR, COMMANDREG);
 269
 270         /* Clear bus error */
 271         readl(BUSERRADREG);
 272
 273         writel(CONFIG_DONE, PCIENREG);
 274
 275         if (setup->mem_resource != NULL)
 276                 vr41xx_pci_controller.mem_resource = setup->mem_resource;
 277
 278         if (setup->io_resource != NULL) {
 279                 vr41xx_pci_controller.io_resource = setup->io_resource;
 280         } else {
 281                 set_io_port_base(IO_PORT_BASE);
 282                 ioport_resource.start = IO_PORT_RESOURCE_START;
 283                 ioport_resource.end = IO_PORT_RESOURCE_END;
 284         }
 285
 286         register_pci_controller(&vr41xx_pci_controller);
 287
 288         return 0;
 289 }
 290
 291 early_initcall(vr41xx_pciu_init);