target/linux/ar7/files/arch/mips/ar7/vlynq-pci.c

   1 /*
   2  * Copyright (C) 2006, 2007 OpenWrt.org
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include <linux/types.h>
  20 #include <linux/pci.h>
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/irq.h>
  24 #include <asm/ar7/vlynq.h>
  25
  26 #define VLYNQ_PCI_SLOTS 2
  27
  28 struct vlynq_reg_config {
  29         u32 offset;
  30         u32 value;
  31 };
  32
  33 struct vlynq_pci_config {
  34         u32 chip_id;
  35         char name[32];
  36         struct vlynq_mapping rx_mapping[4];
  37         int irq;
  38         int irq_type;
  39         u32 chip;
  40         u32 class;
  41         int num_regs;
  42         struct vlynq_reg_config regs[10];
  43 };
  44
  45 struct vlynq_pci_private {
  46         u32 latency;
  47         u32 cache_line;
  48         u32 command;
  49         u32 sz_mask;
  50         struct vlynq_pci_config *config;
  51 };
  52
  53 static struct vlynq_pci_config known_devices[] = {
  54         {
  55                 .chip_id = 0x00000009, .name = "TI TNETW1130",
  56                 .rx_mapping = {
  57                         { .size = 0x22000, .offset = 0xf0000000 },
  58                         { .size = 0x40000, .offset = 0xc0000000 },
  59                         { .size = 0x0, .offset = 0x0 },
  60                         { .size = 0x0, .offset = 0x0 },
  61                 },
  62                 .irq = 0, .chip = 0x9066104c,
  63                 .irq_type = IRQ_TYPE_EDGE_RISING,
  64                 .class = PCI_CLASS_NETWORK_OTHER,
  65                 .num_regs = 5,
  66                 .regs = {
  67                         {
  68                                 .offset = 0x790,
  69                                 .value = (0xd0000000 - PHYS_OFFSET)
  70                         },
  71                         {
  72                                 .offset = 0x794,
  73                                 .value = (0xd0000000 - PHYS_OFFSET)
  74                         },
  75                         { .offset = 0x740, .value = 0 },
  76                         { .offset = 0x744, .value = 0x00010000 },
  77                         { .offset = 0x764, .value = 0x00010000 },
  78                 },
  79         },
  80         {
  81                 .chip_id = 0x00000029, .name = "TI TNETW1350",
  82                 .rx_mapping = {
  83                         { .size = 0x100000, .offset = 0x00300000 },
  84                         { .size = 0x80000, .offset = 0x00000000 },
  85                         { .size = 0x0, .offset = 0x0 },
  86                         { .size = 0x0, .offset = 0x0 },
  87                 },
  88                 .irq = 0, .chip = 0x9066104c,
  89                 .irq_type = IRQ_TYPE_EDGE_RISING,
  90                 .class = PCI_CLASS_NETWORK_OTHER,
  91                 .num_regs = 5,
  92                 .regs = {
  93                         {
  94                                 .offset = 0x790,
  95                                 .value = (0x60000000 - PHYS_OFFSET)
  96                         },
  97                         {
  98                                 .offset = 0x794,
  99                                 .value = (0x60000000 - PHYS_OFFSET)
 100                         },
 101                         { .offset = 0x740, .value = 0 },
 102                         { .offset = 0x744, .value = 0x00010000 },
 103                         { .offset = 0x764, .value = 0x00010000 },
 104                 },
 105         },
 106 };
 107
 108 static struct vlynq_device *slots[VLYNQ_PCI_SLOTS] = { NULL, };
 109
 110 static struct resource vlynq_io_resource = {
 111         .start  = 0x00000000,
 112         .end    = 0x00000000,
 113         .name   = "pci IO space",
 114         .flags  = IORESOURCE_IO
 115 };
 116
 117 static struct resource vlynq_mem_resource = {
 118         .start  = 0x00000000,
 119         .end    = 0x00000000,
 120         .name   = "pci memory space",
 121         .flags  = IORESOURCE_MEM
 122 };
 123
 124 static inline u32 vlynq_get_mapped(struct vlynq_device *dev, int res)
 125 {
 126         int i;
 127         struct vlynq_pci_private *priv = dev->priv;
 128         u32 ret = dev->mem_start;
 129         if (!priv->config->rx_mapping[res].size) return 0;
 130         for (i = 0; i < res; i++)
 131                 ret += priv->config->rx_mapping[i].size;
 132
 133         return ret;
 134 }
 135
 136 static inline u32 vlynq_read(u32 val, int size)
 137 {
 138         switch (size) {
 139         case 1:
 140                 return *(u8 *)&val;
 141         case 2:
 142                 return *(u16 *)&val;
 143         }
 144         return val;
 145 }
 146
 147 static int vlynq_config_read(struct pci_bus *bus, unsigned int devfn,
 148                              int where, int size, u32 *val)
 149 {
 150         struct vlynq_device *dev;
 151         struct vlynq_pci_private *priv;
 152         int resno, slot = PCI_SLOT(devfn);
 153
 154         if ((size == 2) && (where & 1))
 155                 return PCIBIOS_BAD_REGISTER_NUMBER;
 156         else if ((size == 4) && (where & 3))
 157                 return PCIBIOS_BAD_REGISTER_NUMBER;
 158
 159         if (slot >= VLYNQ_PCI_SLOTS)
 160                 return PCIBIOS_DEVICE_NOT_FOUND;
 161
 162         dev = slots[slot];
 163
 164         if (!dev || (PCI_FUNC(devfn) > 0))
 165                 return PCIBIOS_DEVICE_NOT_FOUND;
 166
 167         priv = dev->priv;
 168
 169         switch (where) {
 170         case PCI_VENDOR_ID:
 171                 *val = vlynq_read(priv->config->chip, size);
 172                 break;
 173         case PCI_DEVICE_ID:
 174                 *val = priv->config->chip & 0xffff;
 175         case PCI_COMMAND:
 176                 *val = priv->command;
 177         case PCI_STATUS:
 178 /*              *val = PCI_STATUS_CAP_LIST;*/
 179                 *val = 0;
 180                 break;
 181         case PCI_CLASS_REVISION:
 182                 *val = priv->config->class;
 183                 break;
 184         case PCI_LATENCY_TIMER:
 185                 *val = priv->latency;
 186                 break;
 187         case PCI_HEADER_TYPE:
 188                 *val = PCI_HEADER_TYPE_NORMAL;
 189                 break;
 190         case PCI_CACHE_LINE_SIZE:
 191                 *val = priv->cache_line;
 192                 break;
 193         case PCI_BASE_ADDRESS_0:
 194         case PCI_BASE_ADDRESS_1:
 195         case PCI_BASE_ADDRESS_2:
 196         case PCI_BASE_ADDRESS_3:
 197                 resno = (where - PCI_BASE_ADDRESS_0) >> 2;
 198                 if (priv->sz_mask & (1 << resno)) {
 199                         priv->sz_mask &= ~(1 << resno);
 200                         *val = priv->config->rx_mapping[resno].size;
 201                 } else {
 202                         *val = vlynq_get_mapped(dev, resno);
 203                 }
 204                 break;
 205         case PCI_BASE_ADDRESS_4:
 206         case PCI_BASE_ADDRESS_5:
 207         case PCI_SUBSYSTEM_VENDOR_ID:
 208         case PCI_SUBSYSTEM_ID:
 209         case PCI_ROM_ADDRESS:
 210         case PCI_INTERRUPT_LINE:
 211         case PCI_CARDBUS_CIS:
 212         case PCI_CAPABILITY_LIST:
 213                 *val = 0;
 214                 break;
 215         case PCI_INTERRUPT_PIN:
 216                 *val = 1;
 217                 break;
 218         default:
 219                 printk(KERN_NOTICE "%s: Read of unknown register 0x%x "
 220                        "(size %d)\n", dev->dev.bus_id, where, size);
 221                 return PCIBIOS_BAD_REGISTER_NUMBER;
 222         }
 223         return PCIBIOS_SUCCESSFUL;
 224 }
 225
 226 static int vlynq_config_write(struct pci_bus *bus, unsigned int devfn,
 227                               int where, int size, u32 val)
 228 {
 229         struct vlynq_device *dev;
 230         struct vlynq_pci_private *priv;
 231         int resno, slot = PCI_SLOT(devfn);
 232
 233         if ((size == 2) && (where & 1))
 234                 return PCIBIOS_BAD_REGISTER_NUMBER;
 235         else if ((size == 4) && (where & 3))
 236                 return PCIBIOS_BAD_REGISTER_NUMBER;
 237
 238         if (slot >= VLYNQ_PCI_SLOTS)
 239                 return PCIBIOS_DEVICE_NOT_FOUND;
 240
 241         dev = slots[slot];
 242
 243         if (!dev || (PCI_FUNC(devfn) > 0))
 244                 return PCIBIOS_DEVICE_NOT_FOUND;
 245
 246         priv = dev->priv;
 247
 248         switch (where) {
 249         case PCI_VENDOR_ID:
 250         case PCI_DEVICE_ID:
 251         case PCI_STATUS:
 252         case PCI_CLASS_REVISION:
 253         case PCI_HEADER_TYPE:
 254         case PCI_CACHE_LINE_SIZE:
 255         case PCI_SUBSYSTEM_VENDOR_ID:
 256         case PCI_SUBSYSTEM_ID:
 257         case PCI_INTERRUPT_LINE:
 258         case PCI_INTERRUPT_PIN:
 259         case PCI_CARDBUS_CIS:
 260         case PCI_CAPABILITY_LIST:
 261                 return PCIBIOS_FUNC_NOT_SUPPORTED;
 262         case PCI_COMMAND:
 263                 priv->command = val;
 264         case PCI_LATENCY_TIMER:
 265                 priv->latency = val;
 266                 break;
 267         case PCI_BASE_ADDRESS_0:
 268         case PCI_BASE_ADDRESS_1:
 269         case PCI_BASE_ADDRESS_2:
 270         case PCI_BASE_ADDRESS_3:
 271                 if (val == 0xffffffff) {
 272                         resno = (where - PCI_BASE_ADDRESS_0) >> 2;
 273                         priv->sz_mask |= (1 << resno);
 274                         break;
 275                 }
 276         case PCI_BASE_ADDRESS_4:
 277         case PCI_BASE_ADDRESS_5:
 278         case PCI_ROM_ADDRESS:
 279                 break;
 280         default:
 281                 printk(KERN_NOTICE "%s: Write to unknown register 0x%x "
 282                        "(size %d) value=0x%x\n", dev->dev.bus_id, where, size,
 283                        val);
 284                 return PCIBIOS_BAD_REGISTER_NUMBER;
 285         }
 286         return PCIBIOS_SUCCESSFUL;
 287 }
 288
 289 static struct pci_ops vlynq_pci_ops = {
 290         vlynq_config_read,
 291         vlynq_config_write
 292 };
 293
 294 static struct pci_controller vlynq_controller = {
 295         .pci_ops        = &vlynq_pci_ops,
 296         .io_resource    = &vlynq_io_resource,
 297         .mem_resource   = &vlynq_mem_resource,
 298 };
 299
 300 static int vlynq_pci_probe(struct vlynq_device *dev)
 301 {
 302         int result, i;
 303         u32 chip_id, addr;
 304         struct vlynq_pci_private *priv;
 305         struct vlynq_mapping mapping[4] = { { 0, }, };
 306         struct vlynq_pci_config *config = NULL;
 307
 308         result = vlynq_set_local_irq(dev, 31);
 309         if (result)
 310                 return result;
 311
 312         result = vlynq_set_remote_irq(dev, 30);
 313         if (result)
 314                 return result;
 315
 316         dev->divisor = vlynq_div_auto;
 317         result = vlynq_device_enable(dev);
 318         if (result)
 319                 return result;
 320
 321         chip_id = vlynq_remote_id(dev);
 322         for (i = 0; i < ARRAY_SIZE(known_devices); i++)
 323                 if (chip_id == known_devices[i].chip_id)
 324                         config = &known_devices[i];
 325
 326         if (!config) {
 327                 printk(KERN_DEBUG "vlynq-pci: skipping unknown device "
 328                        "%04x:%04x at %s\n", chip_id >> 16,
 329                        chip_id & 0xffff, dev->dev.bus_id);
 330                 result = -ENODEV;
 331                 goto fail;
 332         }
 333
 334         printk(KERN_NOTICE "vlynq-pci: attaching device %s at %s\n",
 335                config->name, dev->dev.bus_id);
 336
 337         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 338         if (!priv) {
 339                 printk(KERN_ERR "%s: failed to allocate private data\n",
 340                        dev->dev.bus_id);
 341                 result = -ENOMEM;
 342                 goto fail;
 343         }
 344
 345         priv->latency = 64;
 346         priv->cache_line = 32;
 347         priv->config = config;
 348
 349         mapping[0].offset = ARCH_PFN_OFFSET << PAGE_SHIFT;
 350         mapping[0].size = 0x02000000;
 351         vlynq_set_local_mapping(dev, dev->mem_start, mapping);
 352         vlynq_set_remote_mapping(dev, 0, config->rx_mapping);
 353
 354         set_irq_type(vlynq_virq_to_irq(dev, config->irq), config->irq_type);
 355
 356         addr = (u32)ioremap_nocache(dev->mem_start, 0x10000);
 357         if (!addr) {
 358                 printk(KERN_ERR "%s: failed to remap io memory\n",
 359                        dev->dev.bus_id);
 360                 result = -ENXIO;
 361                 goto fail;
 362         }
 363
 364         for (i = 0; i < config->num_regs; i++)
 365                 iowrite32(config->regs[i].value,
 366                           (u32 *)(addr + config->regs[i].offset));
 367
 368         dev->priv = priv;
 369         for (i = 0; i < VLYNQ_PCI_SLOTS; i++) {
 370                 if (!slots[i]) {
 371                         slots[i] = dev;
 372                         break;
 373                 }
 374         }
 375
 376         return 0;
 377
 378 fail:
 379         vlynq_device_disable(dev);
 380
 381         return result;
 382 }
 383
 384 static int vlynq_pci_remove(struct vlynq_device *dev)
 385 {
 386         int i;
 387         struct vlynq_pci_private *priv = dev->priv;
 388
 389         for (i = 0; i < VLYNQ_PCI_SLOTS; i++)
 390                 if (slots[i] == dev)
 391                         slots[i] = NULL;
 392
 393         vlynq_device_disable(dev);
 394         kfree(priv);
 395
 396         return 0;
 397 }
 398
 399 static struct vlynq_driver vlynq_pci = {
 400         .name = "PCI over VLYNQ emulation",
 401         .probe = vlynq_pci_probe,
 402         .remove = vlynq_pci_remove,
 403 };
 404
 405 int vlynq_pci_init(void)
 406 {
 407         int res;
 408         res = vlynq_register_driver(&vlynq_pci);
 409         if (res)
 410                 return res;
 411
 412         register_pci_controller(&vlynq_controller);
 413
 414         return 0;
 415 }
 416
 417 int pcibios_map_irq(struct pci_dev *pdev, u8 slot, u8 pin)
 418 {
 419         struct vlynq_device *dev;
 420         struct vlynq_pci_private *priv;
 421
 422         dev = slots[slot];
 423
 424         if (!dev)
 425                 return 0;
 426
 427         priv = dev->priv;
 428
 429         return vlynq_virq_to_irq(dev, priv->config->irq);
 430 }
 431
 432 /* Do platform specific device initialization at pci_enable_device() time */
 433 int pcibios_plat_dev_init(struct pci_dev *dev)
 434 {
 435         return 0;
 436 }