target/linux/ar7/files/arch/mips/ar7/vlynq.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/init.h>
  20 #include <linux/types.h>
  21 #include <linux/kernel.h>
  22 #include <linux/string.h>
  23 #include <linux/delay.h>
  24 #include <linux/device.h>
  25 #include <linux/ioport.h>
  26 #include <linux/errno.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/irq.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/device.h>
  31 #include <linux/io.h>
  32
  33 #include <asm/addrspace.h>
  34 #include <asm/ar7/ar7.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_LINK          0x00000001
  49 #define VLYNQ_STATUS_LERROR        0x00000080
  50 #define VLYNQ_STATUS_RERROR        0x00000100
  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         u32 revision;
  62         u32 control;
  63         u32 status;
  64         u32 int_prio;
  65         u32 int_status;
  66         u32 int_pending;
  67         u32 int_ptr;
  68         u32 tx_offset;
  69         struct vlynq_mapping rx_mapping[4];
  70         u32 chip;
  71         u32 autonego;
  72         u32 unused[6];
  73         u32 int_device[8];
  74 } __attribute__ ((packed));
  75
  76 #define vlynq_reg_read(reg) readl(&(reg))
  77 #define vlynq_reg_write(reg, val)  writel(val, &(reg))
  78
  79 #ifdef VLYNQ_DEBUG
  80 static void vlynq_dump_regs(struct vlynq_device *dev)
  81 {
  82         int i;
  83         printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
  84                         dev->local, dev->remote);
  85         for (i = 0; i < 32; i++) {
  86                 printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
  87                         i + 1, ((u32 *)dev->local)[i]);
  88                 printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
  89                         i + 1, ((u32 *)dev->remote)[i]);
  90         }
  91 }
  92
  93 static void vlynq_dump_mem(u32 *base, int count)
  94 {
  95         int i;
  96         for (i = 0; i < (count + 3) / 4; i++) {
  97                 if (i % 4 == 0) printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
  98                 printk(KERN_DEBUG " 0x%08x", *(base + i));
  99         }
 100         printk(KERN_DEBUG "\n");
 101 }
 102 #endif
 103
 104 int vlynq_linked(struct vlynq_device *dev)
 105 {
 106         int i;
 107
 108         for (i = 0; i < 10; i++)
 109                 if (vlynq_reg_read(dev->local->status) & VLYNQ_STATUS_LINK)
 110                         return 1;
 111                 else
 112                         mdelay(1);
 113
 114         return 0;
 115 }
 116
 117 static void vlynq_irq_unmask(unsigned int irq)
 118 {
 119         u32 val;
 120         struct vlynq_device *dev = get_irq_chip_data(irq);
 121         int virq;
 122
 123         BUG_ON(!dev);
 124         virq = irq - dev->irq_start;
 125         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 126         val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
 127         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 128 }
 129
 130 static void vlynq_irq_mask(unsigned int irq)
 131 {
 132         u32 val;
 133         struct vlynq_device *dev = get_irq_chip_data(irq);
 134         int virq;
 135
 136         BUG_ON(!dev);
 137         virq = irq - dev->irq_start;
 138         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 139         val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
 140         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 141 }
 142
 143 static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
 144 {
 145         u32 val;
 146         struct vlynq_device *dev = irq_desc[irq].chip_data;
 147         int virq;
 148
 149         BUG_ON(!dev);
 150         virq = irq - dev->irq_start;
 151         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 152         switch (flow_type & IRQ_TYPE_SENSE_MASK) {
 153         case IRQ_TYPE_EDGE_RISING:
 154         case IRQ_TYPE_EDGE_FALLING:
 155         case IRQ_TYPE_EDGE_BOTH:
 156                 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
 157                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 158                 break;
 159         case IRQ_TYPE_LEVEL_HIGH:
 160                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 161                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 162                 break;
 163         case IRQ_TYPE_LEVEL_LOW:
 164                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 165                 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
 166                 break;
 167         default:
 168                 return -EINVAL;
 169         }
 170         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 171         return 0;
 172 }
 173
 174 static irqreturn_t vlynq_irq(int irq, void *dev_id)
 175 {
 176         struct vlynq_device *dev = dev_id;
 177         u32 status, ack;
 178         int virq = 0;
 179
 180         status = vlynq_reg_read(dev->local->int_status);
 181         vlynq_reg_write(dev->local->int_status, status);
 182
 183         if (status & (1 << dev->local_irq)) { /* Local vlynq IRQ. Ack */
 184                 ack = vlynq_reg_read(dev->local->status);
 185                 vlynq_reg_write(dev->local->status, ack);
 186         }
 187
 188         if (status & (1 << dev->remote_irq)) { /* Remote vlynq IRQ. Ack */
 189                 ack = vlynq_reg_read(dev->remote->status);
 190                 vlynq_reg_write(dev->remote->status, ack);
 191         }
 192
 193         status &= ~((1 << dev->local_irq) | (1 << dev->remote_irq));
 194         while (status) {
 195                 if (status & 1) /* Remote device IRQ. Pass. */
 196                         do_IRQ(dev->irq_start + virq);
 197                 status >>= 1;
 198                 virq++;
 199         }
 200
 201         return IRQ_HANDLED;
 202 }
 203
 204 static struct irq_chip vlynq_irq_chip = {
 205         .name = "vlynq",
 206         .unmask = vlynq_irq_unmask,
 207         .mask = vlynq_irq_mask,
 208         .set_type = vlynq_irq_type,
 209 };
 210
 211 static int vlynq_setup_irq(struct vlynq_device *dev)
 212 {
 213         u32 val;
 214         int i;
 215
 216         if (dev->local_irq == dev->remote_irq) {
 217                 printk(KERN_WARNING
 218                         "%s: local vlynq irq should be different from remote\n",
 219                         dev->dev.bus_id);
 220                 return -EINVAL;
 221         }
 222
 223         val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
 224         val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
 225                 VLYNQ_CTRL_INT2CFG;
 226         val |= vlynq_reg_read(dev->local->control);
 227         vlynq_reg_write(dev->local->int_ptr, 0x14);
 228         vlynq_reg_write(dev->local->control, val);
 229
 230         val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
 231         val |= VLYNQ_CTRL_INT_ENABLE;
 232         val |= vlynq_reg_read(dev->remote->control);
 233         vlynq_reg_write(dev->remote->int_ptr, 0x14);
 234         vlynq_reg_write(dev->remote->control, val);
 235
 236         for (i = 0; i < PER_DEVICE_IRQS; i++) {
 237                 if ((i == dev->local_irq) || (i == dev->remote_irq))
 238                         continue;
 239                 set_irq_chip(dev->irq_start + i, &vlynq_irq_chip);
 240                 set_irq_chip_data(dev->irq_start + i, dev);
 241                 vlynq_reg_write(dev->remote->int_device[i >> 2], 0);
 242         }
 243
 244         if (request_irq(dev->irq, vlynq_irq, SA_SHIRQ, "vlynq", dev)) {
 245                 printk(KERN_ERR "%s: request_irq failed\n", dev->dev.bus_id);
 246                 return -EAGAIN;
 247         }
 248
 249         return 0;
 250 }
 251
 252 static void vlynq_free_irq(struct vlynq_device *dev)
 253 {
 254         free_irq(dev->irq, dev);
 255 }
 256
 257 static void vlynq_device_release(struct device *dev)
 258 {
 259         struct vlynq_device *vdev = to_vlynq_device(dev);
 260         kfree(vdev);
 261 }
 262
 263 static int vlynq_device_probe(struct device *dev)
 264 {
 265         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 266         if (drv->probe)
 267                 return drv->probe(to_vlynq_device(dev));
 268         return 0;
 269 }
 270
 271 static int vlynq_device_remove(struct device *dev)
 272 {
 273         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 274         if (drv->remove)
 275                 return drv->remove(to_vlynq_device(dev));
 276         return 0;
 277 }
 278
 279 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
 280 {
 281         driver->driver.name = driver->name;
 282         driver->driver.bus = &vlynq_bus_type;
 283 /*      driver->driver.owner = owner;*/
 284         return driver_register(&driver->driver);
 285 }
 286 EXPORT_SYMBOL(__vlynq_register_driver);
 287
 288 void vlynq_unregister_driver(struct vlynq_driver *driver)
 289 {
 290         driver_unregister(&driver->driver);
 291 }
 292 EXPORT_SYMBOL(vlynq_unregister_driver);
 293
 294 int vlynq_device_enable(struct vlynq_device *dev)
 295 {
 296         u32 div;
 297         int result;
 298         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 299
 300         result = ops->on(dev);
 301         if (result)
 302                 return result;
 303
 304         vlynq_reg_write(dev->local->control, 0);
 305         vlynq_reg_write(dev->remote->control, 0);
 306
 307 /*
 308         if (vlynq_linked(dev)) {
 309                 printk(KERN_INFO "%s: linked (using external clock)\n",
 310                         dev->dev.bus_id);
 311                 return vlynq_setup_irq(dev);
 312         }
 313 */
 314
 315         for (div = 1; div <= 8; div++) {
 316                 mdelay(20);
 317                 vlynq_reg_write(dev->local->control, VLYNQ_CTRL_CLOCK_INT |
 318                         VLYNQ_CTRL_CLOCK_DIV(div - 1));
 319                 vlynq_reg_write(dev->remote->control, 0);
 320                 if (vlynq_linked(dev)) {
 321                         printk(KERN_INFO "%s: linked (using internal clock, div: %d)\n",
 322                                 dev->dev.bus_id, div);
 323                         return vlynq_setup_irq(dev);
 324                 }
 325         }
 326
 327         return -ENODEV;
 328 }
 329
 330 void vlynq_device_disable(struct vlynq_device *dev)
 331 {
 332         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 333
 334         vlynq_free_irq(dev);
 335         ops->off(dev);
 336 }
 337
 338 u32 vlynq_remote_id(struct vlynq_device *dev)
 339 {
 340         return vlynq_reg_read(dev->remote->chip);
 341 }
 342
 343 void vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
 344                              struct vlynq_mapping *mapping)
 345 {
 346         int i;
 347
 348         vlynq_reg_write(dev->local->tx_offset, tx_offset);
 349         for (i = 0; i < 4; i++) {
 350                 vlynq_reg_write(dev->local->rx_mapping[i].offset, mapping[i].offset);
 351                 vlynq_reg_write(dev->local->rx_mapping[i].size, mapping[i].size);
 352         }
 353 }
 354
 355 void vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
 356                               struct vlynq_mapping *mapping)
 357 {
 358         int i;
 359
 360         vlynq_reg_write(dev->remote->tx_offset, tx_offset);
 361         for (i = 0; i < 4; i++) {
 362                 vlynq_reg_write(dev->remote->rx_mapping[i].offset, mapping[i].offset);
 363                 vlynq_reg_write(dev->remote->rx_mapping[i].size, mapping[i].size);
 364         }
 365 }
 366
 367 int vlynq_virq_to_irq(struct vlynq_device *dev, int virq)
 368 {
 369         if ((virq < 0) || (virq >= PER_DEVICE_IRQS))
 370                 return -EINVAL;
 371
 372         if ((virq == dev->local_irq) || (virq == dev->remote_irq))
 373                 return -EINVAL;
 374
 375         return dev->irq_start + virq;
 376 }
 377
 378 int vlynq_irq_to_virq(struct vlynq_device *dev, int irq)
 379 {
 380         if ((irq < dev->irq_start) || (irq >= dev->irq_start + PER_DEVICE_IRQS))
 381                 return -EINVAL;
 382
 383         return irq - dev->irq_start;
 384 }
 385
 386 int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
 387 {
 388         if ((virq < 0) || (virq >= PER_DEVICE_IRQS))
 389                 return -EINVAL;
 390
 391         if (virq == dev->remote_irq)
 392                 return -EINVAL;
 393
 394         dev->local_irq = virq;
 395
 396         return 0;
 397 }
 398
 399 int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
 400 {
 401         if ((virq < 0) || (virq >= PER_DEVICE_IRQS))
 402                 return -EINVAL;
 403
 404         if (virq == dev->local_irq)
 405                 return -EINVAL;
 406
 407         dev->remote_irq = virq;
 408
 409         return 0;
 410 }
 411
 412 static int vlynq_probe(struct platform_device *pdev)
 413 {
 414         struct vlynq_device *dev;
 415         struct resource *regs_res, *mem_res, *irq_res;
 416         int len, result;
 417
 418         if (strcmp(pdev->name, "vlynq"))
 419                 return -ENODEV;
 420
 421         regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 422         if (!regs_res)
 423                 return -ENODEV;
 424
 425         mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
 426         if (!mem_res)
 427                 return -ENODEV;
 428
 429         irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
 430         if (!irq_res)
 431                 return -ENODEV;
 432
 433         dev = kzalloc(sizeof(struct vlynq_device), GFP_KERNEL);
 434         if (!dev) {
 435                 printk(KERN_ERR "vlynq: failed to allocate device structure\n");
 436                 return -ENOMEM;
 437         }
 438
 439         dev->id = pdev->id;
 440         dev->dev.bus = &vlynq_bus_type;
 441         dev->dev.parent = &pdev->dev;
 442         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "vlynq%d", dev->id);
 443         dev->dev.bus_id[BUS_ID_SIZE - 1] = 0;
 444         dev->dev.platform_data = pdev->dev.platform_data;
 445         dev->dev.release = vlynq_device_release;
 446
 447         dev->regs_start = regs_res->start;
 448         dev->regs_end = regs_res->end;
 449         dev->mem_start = mem_res->start;
 450         dev->mem_end = mem_res->end;
 451
 452         len = regs_res->end - regs_res->start;
 453         if (!request_mem_region(regs_res->start, len, dev->dev.bus_id)) {
 454                 printk(KERN_ERR "%s: Can't request vlynq registers\n",
 455                                                         dev->dev.bus_id);
 456                 result = -ENXIO;
 457                 goto fail_request;
 458         }
 459
 460         dev->local = ioremap_nocache(regs_res->start, len);
 461         if (!dev->local) {
 462                 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
 463                                                         dev->dev.bus_id);
 464                 result = -ENXIO;
 465                 goto fail_remap;
 466         }
 467
 468         dev->remote = (struct vlynq_regs *)((u32)dev->local + 128);
 469
 470         dev->irq = platform_get_irq_byname(pdev, "irq");
 471         dev->irq_start = irq_res->start;
 472         dev->irq_end = irq_res->end;
 473         dev->local_irq = 31;
 474         dev->remote_irq = 30;
 475
 476         if (device_register(&dev->dev))
 477                 goto fail_register;
 478         platform_set_drvdata(pdev, dev);
 479
 480         printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
 481                dev->dev.bus_id, (void *)dev->regs_start, dev->irq,
 482                (void *)dev->mem_start);
 483
 484         return 0;
 485
 486 fail_register:
 487 fail_remap:
 488         iounmap(dev->local);
 489 fail_request:
 490         release_mem_region(regs_res->start, len);
 491         kfree(dev);
 492         return result;
 493 }
 494
 495 static int vlynq_remove(struct platform_device *pdev)
 496 {
 497         struct vlynq_device *dev = platform_get_drvdata(pdev);
 498
 499         device_unregister(&dev->dev);
 500         release_mem_region(dev->regs_start, dev->regs_end - dev->regs_start);
 501
 502         kfree(dev);
 503
 504         return 0;
 505 }
 506
 507 static struct platform_driver vlynq_driver = {
 508         .driver.name = "vlynq",
 509         .probe = vlynq_probe,
 510         .remove = vlynq_remove,
 511 };
 512
 513 struct bus_type vlynq_bus_type = {
 514         .name = "vlynq",
 515         .probe = vlynq_device_probe,
 516         .remove = vlynq_device_remove,
 517 };
 518 EXPORT_SYMBOL(vlynq_bus_type);
 519
 520 #ifdef CONFIG_PCI
 521 extern void vlynq_pci_init(void);
 522 #endif
 523 static int __init vlynq_init(void)
 524 {
 525         int res = 0;
 526
 527         res = bus_register(&vlynq_bus_type);
 528         if (res)
 529                 goto fail_bus;
 530
 531         res = platform_driver_register(&vlynq_driver);
 532         if (res)
 533                 goto fail_platform;
 534
 535 #ifdef CONFIG_PCI
 536         vlynq_pci_init();
 537 #endif
 538
 539         return 0;
 540
 541 fail_platform:
 542         bus_unregister(&vlynq_bus_type);
 543 fail_bus:
 544         return res;
 545 }
 546
 547 /*
 548 void __devexit vlynq_exit(void)
 549 {
 550         platform_driver_unregister(&vlynq_driver);
 551         bus_unregister(&vlynq_bus_type);
 552 }
 553 */
 554
 555
 556 subsys_initcall(vlynq_init);