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 <source@mvista.com>
   6  *  Copyright (C) 2004-2008  Yoichi Yuasa <yuasa@linux-mips.org>
   7  *  Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23 /*
  24  * Changes:
  25  *  MontaVista Software Inc. <source@mvista.com>
  26  *  - New creation, NEC VR4122 and VR4131 are supported.
  27  */
  28 #include <linux/init.h>
  29 #include <linux/pci.h>
  30 #include <linux/types.h>
  31
  32 #include <asm/cpu.h>
  33 #include <asm/io.h>
  34 #include <asm/vr41xx/pci.h>
  35 #include <asm/vr41xx/vr41xx.h>
  36
  37 #include "pci-vr41xx.h"
  38
  39 extern struct pci_ops vr41xx_pci_ops;
  40
  41 static void __iomem *pciu_base;
  42
  43 #define pciu_read(offset)               readl(pciu_base + (offset))
  44 #define pciu_write(offset, value)       writel((value), pciu_base + (offset))
  45
  46 static struct pci_master_address_conversion pci_master_memory1 = {
  47         .bus_base_address       = PCI_MASTER_MEM1_BUS_BASE_ADDRESS,
  48         .address_mask           = PCI_MASTER_MEM1_ADDRESS_MASK,
  49         .pci_base_address       = PCI_MASTER_MEM1_PCI_BASE_ADDRESS,
  50 };
  51
  52 static struct pci_target_address_conversion pci_target_memory1 = {
  53         .address_mask           = PCI_TARGET_MEM1_ADDRESS_MASK,
  54         .bus_base_address       = PCI_TARGET_MEM1_BUS_BASE_ADDRESS,
  55 };
  56
  57 static struct pci_master_address_conversion pci_master_io = {
  58         .bus_base_address       = PCI_MASTER_IO_BUS_BASE_ADDRESS,
  59         .address_mask           = PCI_MASTER_IO_ADDRESS_MASK,
  60         .pci_base_address       = PCI_MASTER_IO_PCI_BASE_ADDRESS,
  61 };
  62
  63 static struct pci_mailbox_address pci_mailbox = {
  64         .base_address           = PCI_MAILBOX_BASE_ADDRESS,
  65 };
  66
  67 static struct pci_target_address_window pci_target_window1 = {
  68         .base_address           = PCI_TARGET_WINDOW1_BASE_ADDRESS,
  69 };
  70
  71 static struct resource pci_mem_resource = {
  72         .name   = "PCI Memory resources",
  73         .start  = PCI_MEM_RESOURCE_START,
  74         .end    = PCI_MEM_RESOURCE_END,
  75         .flags  = IORESOURCE_MEM,
  76 };
  77
  78 static struct resource pci_io_resource = {
  79         .name   = "PCI I/O resources",
  80         .start  = PCI_IO_RESOURCE_START,
  81         .end    = PCI_IO_RESOURCE_END,
  82         .flags  = IORESOURCE_IO,
  83 };
  84
  85 static struct pci_controller_unit_setup vr41xx_pci_controller_unit_setup = {
  86         .master_memory1                         = &pci_master_memory1,
  87         .target_memory1                         = &pci_target_memory1,
  88         .master_io                              = &pci_master_io,
  89         .exclusive_access                       = CANNOT_LOCK_FROM_DEVICE,
  90         .wait_time_limit_from_irdy_to_trdy      = 0,
  91         .mailbox                                = &pci_mailbox,
  92         .target_window1                         = &pci_target_window1,
  93         .master_latency_timer                   = 0x80,
  94         .retry_limit                            = 0,
  95         .arbiter_priority_control               = PCI_ARBITRATION_MODE_FAIR,
  96         .take_away_gnt_mode                     = PCI_TAKE_AWAY_GNT_DISABLE,
  97 };
  98
  99 static struct pci_controller vr41xx_pci_controller = {
 100         .pci_ops        = &vr41xx_pci_ops,
 101         .mem_resource   = &pci_mem_resource,
 102         .io_resource    = &pci_io_resource,
 103 };
 104
 105 void __init vr41xx_pciu_setup(struct pci_controller_unit_setup *setup)
 106 {
 107         vr41xx_pci_controller_unit_setup = *setup;
 108 }
 109
 110 static int __init vr41xx_pciu_init(void)
 111 {
 112         struct pci_controller_unit_setup *setup;
 113         struct pci_master_address_conversion *master;
 114         struct pci_target_address_conversion *target;
 115         struct pci_mailbox_address *mailbox;
 116         struct pci_target_address_window *window;
 117         unsigned long vtclock, pci_clock_max;
 118         uint32_t val;
 119
 120         setup = &vr41xx_pci_controller_unit_setup;
 121
 122         if (request_mem_region(PCIU_BASE, PCIU_SIZE, "PCIU") == NULL)
 123                 return -EBUSY;
 124
 125         pciu_base = ioremap(PCIU_BASE, PCIU_SIZE);
 126         if (pciu_base == NULL) {
 127                 release_mem_region(PCIU_BASE, PCIU_SIZE);
 128                 return -EBUSY;
 129         }
 130
 131         /* Disable PCI interrupt */
 132         vr41xx_disable_pciint();
 133
 134         /* Supply VTClock to PCIU */
 135         vr41xx_supply_clock(PCIU_CLOCK);
 136
 137         /* Dummy write, waiting for supply of VTClock. */
 138         vr41xx_disable_pciint();
 139
 140         /* Select PCI clock */
 141         if (setup->pci_clock_max != 0)
 142                 pci_clock_max = setup->pci_clock_max;
 143         else
 144                 pci_clock_max = PCI_CLOCK_MAX;
 145         vtclock = vr41xx_get_vtclock_frequency();
 146         if (vtclock < pci_clock_max)
 147                 pciu_write(PCICLKSELREG, EQUAL_VTCLOCK);
 148         else if ((vtclock / 2) < pci_clock_max)
 149                 pciu_write(PCICLKSELREG, HALF_VTCLOCK);
 150         else if (current_cpu_data.processor_id >= PRID_VR4131_REV2_1 &&
 151                  (vtclock / 3) < pci_clock_max)
 152                 pciu_write(PCICLKSELREG, ONE_THIRD_VTCLOCK);
 153         else if ((vtclock / 4) < pci_clock_max)
 154                 pciu_write(PCICLKSELREG, QUARTER_VTCLOCK);
 155         else {
 156                 printk(KERN_ERR "PCI Clock is over 33MHz.\n");
 157                 iounmap(pciu_base);
 158                 return -EINVAL;
 159         }
 160
 161         /* Supply PCI clock by PCI bus */
 162         vr41xx_supply_clock(PCI_CLOCK);
 163
 164         if (setup->master_memory1 != NULL) {
 165                 master = setup->master_memory1;
 166                 val = IBA(master->bus_base_address) |
 167                       MASTER_MSK(master->address_mask) |
 168                       WINEN |
 169                       PCIA(master->pci_base_address);
 170                 pciu_write(PCIMMAW1REG, val);
 171         } else {
 172                 val = pciu_read(PCIMMAW1REG);
 173                 val &= ~WINEN;
 174                 pciu_write(PCIMMAW1REG, val);
 175         }
 176
 177         if (setup->master_memory2 != NULL) {
 178                 master = setup->master_memory2;
 179                 val = IBA(master->bus_base_address) |
 180                       MASTER_MSK(master->address_mask) |
 181                       WINEN |
 182                       PCIA(master->pci_base_address);
 183                 pciu_write(PCIMMAW2REG, val);
 184         } else {
 185                 val = pciu_read(PCIMMAW2REG);
 186                 val &= ~WINEN;
 187                 pciu_write(PCIMMAW2REG, val);
 188         }
 189
 190         if (setup->target_memory1 != NULL) {
 191                 target = setup->target_memory1;
 192                 val = TARGET_MSK(target->address_mask) |
 193                       WINEN |
 194                       ITA(target->bus_base_address);
 195                 pciu_write(PCITAW1REG, val);
 196         } else {
 197                 val = pciu_read(PCITAW1REG);
 198                 val &= ~WINEN;
 199                 pciu_write(PCITAW1REG, val);
 200         }
 201
 202         if (setup->target_memory2 != NULL) {
 203                 target = setup->target_memory2;
 204                 val = TARGET_MSK(target->address_mask) |
 205                       WINEN |
 206                       ITA(target->bus_base_address);
 207                 pciu_write(PCITAW2REG, val);
 208         } else {
 209                 val = pciu_read(PCITAW2REG);
 210                 val &= ~WINEN;
 211                 pciu_write(PCITAW2REG, val);
 212         }
 213
 214         if (setup->master_io != NULL) {
 215                 master = setup->master_io;
 216                 val = IBA(master->bus_base_address) |
 217                       MASTER_MSK(master->address_mask) |
 218                       WINEN |
 219                       PCIIA(master->pci_base_address);
 220                 pciu_write(PCIMIOAWREG, val);
 221         } else {
 222                 val = pciu_read(PCIMIOAWREG);
 223                 val &= ~WINEN;
 224                 pciu_write(PCIMIOAWREG, val);
 225         }
 226
 227         if (setup->exclusive_access == CANNOT_LOCK_FROM_DEVICE)
 228                 pciu_write(PCIEXACCREG, UNLOCK);
 229         else
 230                 pciu_write(PCIEXACCREG, 0);
 231
 232         if (current_cpu_type() == CPU_VR4122)
 233                 pciu_write(PCITRDYVREG, TRDYV(setup->wait_time_limit_from_irdy_to_trdy));
 234
 235         pciu_write(LATTIMEREG, MLTIM(setup->master_latency_timer));
 236
 237         if (setup->mailbox != NULL) {
 238                 mailbox = setup->mailbox;
 239                 val = MBADD(mailbox->base_address) | TYPE_32BITSPACE |
 240                       MSI_MEMORY | PREF_APPROVAL;
 241                 pciu_write(MAILBAREG, val);
 242         }
 243
 244         if (setup->target_window1) {
 245                 window = setup->target_window1;
 246                 val = PMBA(window->base_address) | TYPE_32BITSPACE |
 247                       MSI_MEMORY | PREF_APPROVAL;
 248                 pciu_write(PCIMBA1REG, val);
 249         }
 250
 251         if (setup->target_window2) {
 252                 window = setup->target_window2;
 253                 val = PMBA(window->base_address) | TYPE_32BITSPACE |
 254                       MSI_MEMORY | PREF_APPROVAL;
 255                 pciu_write(PCIMBA2REG, val);
 256         }
 257
 258         val = pciu_read(RETVALREG);
 259         val &= ~RTYVAL_MASK;
 260         val |= RTYVAL(setup->retry_limit);
 261         pciu_write(RETVALREG, val);
 262
 263         val = pciu_read(PCIAPCNTREG);
 264         val &= ~(TKYGNT | PAPC);
 265
 266         switch (setup->arbiter_priority_control) {
 267         case PCI_ARBITRATION_MODE_ALTERNATE_0:
 268                 val |= PAPC_ALTERNATE_0;
 269                 break;
 270         case PCI_ARBITRATION_MODE_ALTERNATE_B:
 271                 val |= PAPC_ALTERNATE_B;
 272                 break;
 273         default:
 274                 val |= PAPC_FAIR;
 275                 break;
 276         }
 277
 278         if (setup->take_away_gnt_mode == PCI_TAKE_AWAY_GNT_ENABLE)
 279                 val |= TKYGNT_ENABLE;
 280
 281         pciu_write(PCIAPCNTREG, val);
 282
 283         pciu_write(COMMANDREG, PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
 284                                PCI_COMMAND_MASTER | PCI_COMMAND_PARITY |
 285                                PCI_COMMAND_SERR);
 286
 287         /* Clear bus error */
 288         pciu_read(BUSERRADREG);
 289
 290         pciu_write(PCIENREG, PCIU_CONFIG_DONE);
 291
 292         if (setup->mem_resource != NULL)
 293                 vr41xx_pci_controller.mem_resource = setup->mem_resource;
 294
 295         if (setup->io_resource != NULL) {
 296                 vr41xx_pci_controller.io_resource = setup->io_resource;
 297         } else {
 298                 set_io_port_base(IO_PORT_BASE);
 299                 ioport_resource.start = IO_PORT_RESOURCE_START;
 300                 ioport_resource.end = IO_PORT_RESOURCE_END;
 301         }
 302
 303         if (setup->master_io) {
 304                 void __iomem *io_map_base;
 305                 struct resource *res = vr41xx_pci_controller.io_resource;
 306                 master = setup->master_io;
 307                 io_map_base = ioremap(master->bus_base_address,
 308                                       resource_size(res));
 309                 if (!io_map_base)
 310                         return -EBUSY;
 311
 312                 vr41xx_pci_controller.io_map_base = (unsigned long)io_map_base;
 313         }
 314
 315         register_pci_controller(&vr41xx_pci_controller);
 316
 317         return 0;
 318 }
 319
 320 arch_initcall(vr41xx_pciu_init);