target/linux/ar7-2.6/files/arch/mips/ar7/vlynq.c

   1 /*
   2  * $Id$
   3  *
   4  * Copyright (C) 2006, 2007 OpenWrt.org
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/types.h>
  23 #include <linux/kernel.h>
  24 #include <linux/string.h>
  25 #include <linux/delay.h>
  26 #include <linux/device.h>
  27 #include <linux/ioport.h>
  28 #include <linux/errno.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/irq.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/device.h>
  33 #include <asm/addrspace.h>
  34 #include <asm/io.h>
  35 #include <asm/ar7/vlynq.h>
  36
  37 #define PER_DEVICE_IRQS 32
  38
  39 #define VLYNQ_CTRL_PM_ENABLE       0x80000000
  40 #define VLYNQ_CTRL_CLOCK_INT       0x00008000
  41 #define VLYNQ_CTRL_CLOCK_DIV(x)    ((x & 7) << 16)
  42 #define VLYNQ_CTRL_INT_LOCAL       0x00004000
  43 #define VLYNQ_CTRL_INT_ENABLE      0x00002000
  44 #define VLYNQ_CTRL_INT_VECTOR(x)   ((x & 0x1f) << 8)
  45 #define VLYNQ_CTRL_INT2CFG         0x00000080
  46 #define VLYNQ_CTRL_RESET           0x00000001
  47
  48 #define VLYNQ_STATUS_RERROR        0x00000100
  49 #define VLYNQ_STATUS_LERROR        0x00000080
  50 #define VLYNQ_STATUS_LINK          0x00000001
  51
  52 #define VINT_ENABLE    0x00000100
  53 #define VINT_TYPE_EDGE 0x00000080
  54 #define VINT_LEVEL_LOW 0x00000040
  55 #define VINT_VECTOR(x) (x & 0x1f)
  56 #define VINT_OFFSET(irq) (8 * ((irq) % 4))
  57
  58 #define VLYNQ_AUTONEGO_V2          0x00010000
  59
  60 struct vlynq_regs {
  61         volatile u32 revision;
  62         volatile u32 control;
  63         volatile u32 status;
  64         volatile u32 int_prio;
  65         volatile u32 int_status;
  66         volatile u32 int_pending;
  67         volatile u32 int_ptr;
  68         volatile u32 tx_offset;
  69         volatile struct vlynq_mapping rx_mapping[4];
  70         volatile u32 chip;
  71         volatile u32 autonego;
  72         volatile u32 unused[6];
  73         volatile u32 int_device[8];
  74 } __attribute__ ((packed));
  75
  76 #ifdef VLYNQ_DEBUG
  77 static void vlynq_dump_regs(struct vlynq_device *dev)
  78 {
  79         int i;
  80         printk("VLYNQ local=%p remote=%p\n", dev->local, dev->remote);
  81         for (i = 0; i < 32; i++) {
  82                 printk("VLYNQ: local %d: %08x\n", i + 1, ((u32 *)dev->local)[i]);
  83                 printk("VLYNQ: remote %d: %08x\n", i + 1, ((u32 *)dev->remote)[i]);
  84         }
  85 }
  86
  87 static void vlynq_dump_mem(u32 *base, int count)
  88 {
  89         int i;
  90         for (i = 0; i < (count + 3) / 4; i++) {
  91                 if (i % 4 == 0) printk("\nMEM[0x%04x]:", i * 4);
  92                 printk(" 0x%08x", *(base + i));
  93         }
  94         printk("\n");
  95 }
  96 #endif
  97
  98 int vlynq_linked(struct vlynq_device *dev)
  99 {
 100         int i;
 101         for (i = 0; i < 10; i++)
 102                 if (dev->local->status & VLYNQ_STATUS_LINK) {
 103                         printk("%s: linked\n", dev->dev.bus_id);
 104                         return 1;
 105                 } else {
 106                         mdelay(1);
 107                 }
 108         return 0;
 109 }
 110
 111 static void vlynq_irq_unmask(unsigned int irq)
 112 {
 113         volatile u32 val;
 114         struct vlynq_device *dev = irq_desc[irq].chip_data;
 115         int virq;
 116
 117         BUG_ON(!dev);
 118         virq = irq - dev->irq_start;
 119         val = dev->remote->int_device[virq >> 2];
 120         val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
 121         dev->remote->int_device[virq >> 2] = val;
 122 }
 123
 124 static void vlynq_irq_mask(unsigned int irq)
 125 {
 126         volatile u32 val;
 127         struct vlynq_device *dev = irq_desc[irq].chip_data;
 128         int virq;
 129
 130         BUG_ON(!dev);
 131         virq = irq - dev->irq_start;
 132         val = dev->remote->int_device[virq >> 2];
 133         val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
 134         dev->remote->int_device[virq >> 2] = val;
 135 }
 136
 137 static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
 138 {
 139         volatile u32 val;
 140         struct vlynq_device *dev = irq_desc[irq].chip_data;
 141         int virq;
 142
 143         BUG_ON(!dev);
 144         virq = irq - dev->irq_start;
 145         val = dev->remote->int_device[virq >> 2];
 146         switch (flow_type & IRQ_TYPE_SENSE_MASK) {
 147         case IRQ_TYPE_EDGE_RISING:
 148         case IRQ_TYPE_EDGE_FALLING:
 149         case IRQ_TYPE_EDGE_BOTH:
 150                 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
 151                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 152                 break;
 153         case IRQ_TYPE_LEVEL_HIGH:
 154                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 155                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 156                 break;
 157         case IRQ_TYPE_LEVEL_LOW:
 158                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 159                 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
 160                 break;
 161         default:
 162                 return -EINVAL;
 163         }
 164         dev->remote->int_device[virq >> 2] = val;
 165         return 0;
 166 }
 167
 168 static irqreturn_t vlynq_irq(int irq, void *dev_id)
 169 {
 170         struct vlynq_device *dev = dev_id;
 171         u32 status, ack;
 172         int virq = 0;
 173
 174         status = dev->local->int_status;
 175         dev->local->int_status = status;
 176
 177         if (status & (1 << dev->local_irq)) { /* Local vlynq IRQ. Ack */
 178                 ack = dev->local->status;
 179                 dev->local->status = ack;
 180         }
 181
 182         if (status & (1 << dev->remote_irq)) { /* Remote vlynq IRQ. Ack */
 183                 ack = dev->remote->status;
 184                 dev->remote->status = ack;
 185         }
 186
 187         status &= ~((1 << dev->local_irq) | (1 << dev->remote_irq));
 188         while (status) {
 189                 if (status & 1) /* Remote device IRQ. Pass. */
 190                         do_IRQ(dev->irq_start + virq);
 191                 status >>= 1;
 192                 virq++;
 193         }
 194
 195         return IRQ_HANDLED;
 196 }
 197
 198 static struct irq_chip vlynq_irq_chip = {
 199         .name = "vlynq",
 200         .unmask = vlynq_irq_unmask,
 201         .mask = vlynq_irq_mask,
 202         .set_type = vlynq_irq_type,
 203 };
 204
 205 static int vlynq_setup_irq(struct vlynq_device *dev)
 206 {
 207         u32 val;
 208         int i;
 209
 210         if (dev->local_irq == dev->remote_irq) {
 211                 printk("%s: local vlynq irq should be different from remote\n",
 212                        dev->dev.bus_id);
 213                 return -EINVAL;
 214         }
 215
 216         val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
 217         val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
 218                 VLYNQ_CTRL_INT2CFG;
 219         dev->local->int_ptr = 0x14;
 220         dev->local->control |= val;
 221
 222         val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
 223         val |= VLYNQ_CTRL_INT_ENABLE;
 224         dev->remote->int_ptr = 0x14;
 225         dev->remote->control |= val;
 226
 227         for (i = 0; i < PER_DEVICE_IRQS; i++) {
 228                 if ((i == dev->local_irq) || (i == dev->remote_irq))
 229                         continue;
 230                 irq_desc[dev->irq_start + i].status = IRQ_DISABLED;
 231                 irq_desc[dev->irq_start + i].action = 0;
 232                 irq_desc[dev->irq_start + i].depth = 1;
 233                 irq_desc[dev->irq_start + i].chip = &vlynq_irq_chip;
 234                 irq_desc[dev->irq_start + i].chip_data = dev;
 235                 dev->remote->int_device[i >> 2] = 0;
 236         }
 237
 238         if (request_irq(dev->irq, vlynq_irq, SA_SHIRQ, "AR7 VLYNQ", dev)) {
 239                 printk("%s: request_irq failed\n", dev->dev.bus_id);
 240                 return -EAGAIN;
 241         }
 242
 243         return 0;
 244 }
 245
 246 static void vlynq_free_irq(struct vlynq_device *dev)
 247 {
 248         free_irq(dev->irq, dev);
 249 }
 250
 251 static void vlynq_device_release(struct device *dev)
 252 {
 253         struct vlynq_device *vdev = to_vlynq_device(dev);
 254         kfree(vdev);
 255 }
 256
 257 static int vlynq_device_probe(struct device *dev)
 258 {
 259         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 260         if (drv->probe)
 261                 return drv->probe(to_vlynq_device(dev));
 262         return 0;
 263 }
 264
 265 static int vlynq_device_remove(struct device *dev)
 266 {
 267         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 268         if (drv->remove)
 269                 return drv->remove(to_vlynq_device(dev));
 270         return 0;
 271 }
 272
 273 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
 274 {
 275         driver->driver.name = driver->name;
 276         driver->driver.bus = &vlynq_bus_type;
 277 /*      driver->driver.owner = owner;*/
 278         return driver_register(&driver->driver);
 279 }
 280 EXPORT_SYMBOL(__vlynq_register_driver);
 281
 282 void vlynq_unregister_driver(struct vlynq_driver *driver)
 283 {
 284         driver_unregister(&driver->driver);
 285 }
 286 EXPORT_SYMBOL(vlynq_unregister_driver);
 287
 288 int vlynq_device_enable(struct vlynq_device *dev)
 289 {
 290         u32 val;
 291         int result;
 292         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 293
 294         result = ops->on(dev);
 295         if (result)
 296                 return result;
 297
 298         dev->local->control = 0;
 299         dev->remote->control = 0;
 300
 301         if (vlynq_linked(dev))
 302                 return vlynq_setup_irq(dev);
 303
 304         for (val = 0; val < 8; val++) {
 305                 dev->local->control = VLYNQ_CTRL_CLOCK_DIV(val) |
 306                         VLYNQ_CTRL_CLOCK_INT;
 307                 if (vlynq_linked(dev))
 308                         return vlynq_setup_irq(dev);
 309         }
 310
 311         return -ENODEV;
 312 }
 313
 314 void vlynq_device_disable(struct vlynq_device *dev)
 315 {
 316         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 317
 318         vlynq_free_irq(dev);
 319         ops->off(dev);
 320 }
 321
 322 u32 vlynq_local_id(struct vlynq_device *dev)
 323 {
 324         return dev->local->chip;
 325 }
 326
 327 u32 vlynq_remote_id(struct vlynq_device *dev)
 328 {
 329         return dev->remote->chip;
 330 }
 331
 332 void vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
 333                              struct vlynq_mapping *mapping)
 334 {
 335         int i;
 336
 337         dev->local->tx_offset = tx_offset;
 338         for (i = 0; i < 4; i++) {
 339                 dev->local->rx_mapping[i].offset = mapping[i].offset;
 340                 dev->local->rx_mapping[i].size = mapping[i].size;
 341         }
 342 }
 343
 344 void vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
 345                               struct vlynq_mapping *mapping)
 346 {
 347         int i;
 348
 349         dev->remote->tx_offset = tx_offset;
 350         for (i = 0; i < 4; i++) {
 351                 dev->remote->rx_mapping[i].offset = mapping[i].offset;
 352                 dev->remote->rx_mapping[i].size = mapping[i].size;
 353         }
 354 }
 355
 356 int vlynq_virq_to_irq(struct vlynq_device *dev, int virq)
 357 {
 358         if ((virq < 0) || (virq >= PER_DEVICE_IRQS))
 359                 return -EINVAL;
 360
 361         if ((virq == dev->local_irq) || (virq == dev->remote_irq))
 362                 return -EINVAL;
 363
 364         return dev->irq_start + virq;
 365 }
 366
 367 int vlynq_irq_to_virq(struct vlynq_device *dev, int irq)
 368 {
 369         if ((irq < dev->irq_start) || (irq >= dev->irq_start + PER_DEVICE_IRQS))
 370                 return -EINVAL;
 371
 372         return irq - dev->irq_start;
 373 }
 374
 375 int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
 376 {
 377         if ((virq < 0) || (virq >= PER_DEVICE_IRQS))
 378                 return -EINVAL;
 379
 380         if (virq == dev->remote_irq)
 381                 return -EINVAL;
 382
 383         dev->local_irq = virq;
 384
 385         return 0;
 386 }
 387
 388 int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
 389 {
 390         if ((virq < 0) || (virq >= PER_DEVICE_IRQS))
 391                 return -EINVAL;
 392
 393         if (virq == dev->local_irq)
 394                 return -EINVAL;
 395
 396         dev->remote_irq = virq;
 397
 398         return 0;
 399 }
 400
 401 static int vlynq_probe(struct platform_device *pdev)
 402 {
 403         struct vlynq_device *dev;
 404         struct resource *regs_res, *mem_res, *irq_res;
 405         int len, result;
 406
 407         if (strcmp(pdev->name, "vlynq"))
 408                 return -ENODEV;
 409
 410         regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 411         if (!regs_res)
 412                 return -ENODEV;
 413
 414         mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
 415         if (!mem_res)
 416                 return -ENODEV;
 417
 418         irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
 419         if (!irq_res)
 420                 return -ENODEV;
 421
 422         dev = kmalloc(sizeof(struct vlynq_device), GFP_KERNEL);
 423         if (!dev) {
 424                 printk(KERN_ERR "vlynq: failed to allocate device structure\n");
 425                 return -ENOMEM;
 426         }
 427
 428         memset(dev, 0, sizeof(struct vlynq_device));
 429
 430         dev->id = pdev->id;
 431         dev->dev.bus = &vlynq_bus_type;
 432         dev->dev.parent = &pdev->dev;
 433         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "vlynq%d", dev->id);
 434         dev->dev.bus_id[BUS_ID_SIZE - 1] = 0;
 435         dev->dev.platform_data = pdev->dev.platform_data;
 436         dev->dev.release = vlynq_device_release;
 437
 438         dev->regs_start = regs_res->start;
 439         dev->regs_end = regs_res->end;
 440         dev->mem_start = mem_res->start;
 441         dev->mem_end = mem_res->end;
 442
 443         len = regs_res->end - regs_res->start;
 444         if (!request_mem_region(regs_res->start, len, dev->dev.bus_id)) {
 445                 printk("%s: Can't request vlynq registers\n", dev->dev.bus_id);
 446                 result = -ENXIO;
 447                 goto fail_request;
 448         }
 449
 450         dev->local = ioremap_nocache(regs_res->start, len);
 451         if (!dev->local) {
 452                 printk("%s: Can't remap vlynq registers\n", dev->dev.bus_id);
 453                 result = -ENXIO;
 454                 goto fail_remap;
 455         }
 456
 457         dev->remote = (struct vlynq_regs *)((u32)dev->local + 128);
 458
 459         dev->irq = platform_get_irq_byname(pdev, "irq");
 460         dev->irq_start = irq_res->start;
 461         dev->irq_end = irq_res->end;
 462         dev->local_irq = 31;
 463         dev->remote_irq = 30;
 464
 465         if (device_register(&dev->dev))
 466                 goto fail_register;
 467         platform_set_drvdata(pdev, dev);
 468
 469         printk("%s: regs 0x%p, irq %d, mem 0x%p\n",
 470                dev->dev.bus_id, (void *)dev->regs_start, dev->irq,
 471                (void *)dev->mem_start);
 472
 473         return 0;
 474
 475 fail_register:
 476 fail_remap:
 477         iounmap(dev->local);
 478 fail_request:
 479         release_mem_region(regs_res->start, len);
 480         kfree(dev);
 481         return result;
 482 }
 483
 484 static int vlynq_remove(struct platform_device *pdev)
 485 {
 486         struct vlynq_device *dev = platform_get_drvdata(pdev);
 487
 488         device_unregister(&dev->dev);
 489         release_mem_region(dev->regs_start, dev->regs_end - dev->regs_start);
 490
 491         kfree(dev);
 492
 493         return 0;
 494 }
 495
 496 static struct platform_driver vlynq_driver = {
 497         .driver.name = "vlynq",
 498         .probe = vlynq_probe,
 499         .remove = vlynq_remove,
 500 };
 501
 502 struct bus_type vlynq_bus_type = {
 503         .name = "vlynq",
 504         .probe = vlynq_device_probe,
 505         .remove = vlynq_device_remove,
 506 };
 507 EXPORT_SYMBOL(vlynq_bus_type);
 508
 509 #ifdef CONFIG_PCI
 510 extern void vlynq_pci_init(void);
 511 #endif
 512 int __init vlynq_init(void)
 513 {
 514         int res = 0;
 515
 516         res = bus_register(&vlynq_bus_type);
 517         if (res)
 518                 goto fail_bus;
 519
 520         res = platform_driver_register(&vlynq_driver);
 521         if (res)
 522                 goto fail_platform;
 523
 524 #ifdef CONFIG_PCI
 525         vlynq_pci_init();
 526 #endif
 527
 528         return 0;
 529
 530 fail_platform:
 531         bus_unregister(&vlynq_bus_type);
 532 fail_bus:
 533         return res;
 534 }
 535
 536 /*
 537 void __devexit vlynq_exit(void)
 538 {
 539         platform_driver_unregister(&vlynq_driver);
 540         bus_unregister(&vlynq_bus_type);
 541 }
 542 */
 543
 544
 545 subsys_initcall(vlynq_init);