target/linux/ar7/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/ar7.h>
  36 #include <asm/ar7/vlynq.h>
  37
  38 #define PER_DEVICE_IRQS 32
  39
  40 #define VLYNQ_CTRL_PM_ENABLE       0x80000000
  41 #define VLYNQ_CTRL_CLOCK_INT       0x00008000
  42 #define VLYNQ_CTRL_CLOCK_DIV(x)    (((x) & 7) << 16)
  43 #define VLYNQ_CTRL_INT_LOCAL       0x00004000
  44 #define VLYNQ_CTRL_INT_ENABLE      0x00002000
  45 #define VLYNQ_CTRL_INT_VECTOR(x)   (((x) & 0x1f) << 8)
  46 #define VLYNQ_CTRL_INT2CFG         0x00000080
  47 #define VLYNQ_CTRL_RESET           0x00000001
  48
  49 #define VLYNQ_STATUS_LINK          0x00000001
  50 #define VLYNQ_STATUS_LERROR        0x00000080
  51 #define VLYNQ_STATUS_RERROR        0x00000100
  52
  53 #define VINT_ENABLE    0x00000100
  54 #define VINT_TYPE_EDGE 0x00000080
  55 #define VINT_LEVEL_LOW 0x00000040
  56 #define VINT_VECTOR(x) ((x) & 0x1f)
  57 #define VINT_OFFSET(irq) (8 * ((irq) % 4))
  58
  59 #define VLYNQ_AUTONEGO_V2          0x00010000
  60
  61 struct vlynq_regs {
  62         u32 revision;
  63         u32 control;
  64         u32 status;
  65         u32 int_prio;
  66         u32 int_status;
  67         u32 int_pending;
  68         u32 int_ptr;
  69         u32 tx_offset;
  70         struct vlynq_mapping rx_mapping[4];
  71         u32 chip;
  72         u32 autonego;
  73         u32 unused[6];
  74         u32 int_device[8];
  75 } __attribute__ ((packed));
  76
  77 #define vlynq_reg_read(reg) readl(&(reg))
  78 #define vlynq_reg_write(reg, val)  writel(val, &(reg))
  79
  80 #ifdef VLYNQ_DEBUG
  81 static void vlynq_dump_regs(struct vlynq_device *dev)
  82 {
  83         int i;
  84         printk("VLYNQ local=%p remote=%p\n", dev->local, dev->remote);
  85         for (i = 0; i < 32; i++) {
  86                 printk("VLYNQ: local %d: %08x\n", i + 1, ((u32 *)dev->local)[i]);
  87                 printk("VLYNQ: remote %d: %08x\n", i + 1, ((u32 *)dev->remote)[i]);
  88         }
  89 }
  90
  91 static void vlynq_dump_mem(u32 *base, int count)
  92 {
  93         int i;
  94         for (i = 0; i < (count + 3) / 4; i++) {
  95                 if (i % 4 == 0) printk("\nMEM[0x%04x]:", i * 4);
  96                 printk(" 0x%08x", *(base + i));
  97         }
  98         printk("\n");
  99 }
 100 #endif
 101
 102 int vlynq_linked(struct vlynq_device *dev)
 103 {
 104         int i;
 105
 106         for (i = 0; i < 10; i++)
 107                 if (vlynq_reg_read(dev->local->status) & VLYNQ_STATUS_LINK)
 108                         return 1;
 109                 else
 110                         mdelay(1);
 111
 112         return 0;
 113 }
 114
 115 static void vlynq_irq_unmask(unsigned int irq)
 116 {
 117         u32 val;
 118         struct vlynq_device *dev = get_irq_chip_data(irq);
 119         int virq;
 120
 121         BUG_ON(!dev);
 122         virq = irq - dev->irq_start;
 123         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 124         val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
 125         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 126 }
 127
 128 static void vlynq_irq_mask(unsigned int irq)
 129 {
 130         u32 val;
 131         struct vlynq_device *dev = get_irq_chip_data(irq);
 132         int virq;
 133
 134         BUG_ON(!dev);
 135         virq = irq - dev->irq_start;
 136         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 137         val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
 138         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 139 }
 140
 141 static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
 142 {
 143         u32 val;
 144         struct vlynq_device *dev = irq_desc[irq].chip_data;
 145         int virq;
 146
 147         BUG_ON(!dev);
 148         virq = irq - dev->irq_start;
 149         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 150         switch (flow_type & IRQ_TYPE_SENSE_MASK) {
 151         case IRQ_TYPE_EDGE_RISING:
 152         case IRQ_TYPE_EDGE_FALLING:
 153         case IRQ_TYPE_EDGE_BOTH:
 154                 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
 155                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 156                 break;
 157         case IRQ_TYPE_LEVEL_HIGH:
 158                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 159                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 160                 break;
 161         case IRQ_TYPE_LEVEL_LOW:
 162                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 163                 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
 164                 break;
 165         default:
 166                 return -EINVAL;
 167         }
 168         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 169         return 0;
 170 }
 171
 172 static irqreturn_t vlynq_irq(int irq, void *dev_id)
 173 {
 174         struct vlynq_device *dev = dev_id;
 175         u32 status, ack;
 176         int virq = 0;
 177
 178         status = vlynq_reg_read(dev->local->int_status);
 179         vlynq_reg_write(dev->local->int_status, status);
 180
 181         if (status & (1 << dev->local_irq)) { /* Local vlynq IRQ. Ack */
 182                 ack = vlynq_reg_read(dev->local->status);
 183                 vlynq_reg_write(dev->local->status, ack);
 184         }
 185
 186         if (status & (1 << dev->remote_irq)) { /* Remote vlynq IRQ. Ack */
 187                 ack = vlynq_reg_read(dev->remote->status);
 188                 vlynq_reg_write(dev->remote->status, ack);
 189         }
 190
 191         status &= ~((1 << dev->local_irq) | (1 << dev->remote_irq));
 192         while (status) {
 193                 if (status & 1) /* Remote device IRQ. Pass. */
 194                         do_IRQ(dev->irq_start + virq);
 195                 status >>= 1;
 196                 virq++;
 197         }
 198
 199         return IRQ_HANDLED;
 200 }
 201
 202 static struct irq_chip vlynq_irq_chip = {
 203         .name = "vlynq",
 204         .unmask = vlynq_irq_unmask,
 205         .mask = vlynq_irq_mask,
 206         .set_type = vlynq_irq_type,
 207 };
 208
 209 static int vlynq_setup_irq(struct vlynq_device *dev)
 210 {
 211         u32 val;
 212         int i;
 213
 214         if (dev->local_irq == dev->remote_irq) {
 215                 printk("%s: local vlynq irq should be different from remote\n",
 216                        dev->dev.bus_id);
 217                 return -EINVAL;
 218         }
 219
 220         val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
 221         val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
 222                 VLYNQ_CTRL_INT2CFG;
 223         val |= vlynq_reg_read(dev->local->control);
 224         vlynq_reg_write(dev->local->int_ptr, 0x14);
 225         vlynq_reg_write(dev->local->control, val);
 226
 227         val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
 228         val |= VLYNQ_CTRL_INT_ENABLE;
 229         val |= vlynq_reg_read(dev->remote->control);
 230         vlynq_reg_write(dev->remote->int_ptr, 0x14);
 231         vlynq_reg_write(dev->remote->control, val);
 232
 233         for (i = 0; i < PER_DEVICE_IRQS; i++) {
 234                 if ((i == dev->local_irq) || (i == dev->remote_irq))
 235                         continue;
 236                 set_irq_chip(dev->irq_start + i, &vlynq_irq_chip);
 237                 set_irq_chip_data(dev->irq_start + i, dev);
 238                 vlynq_reg_write(dev->remote->int_device[i >> 2], 0);
 239         }
 240
 241         if (request_irq(dev->irq, vlynq_irq, SA_SHIRQ, "vlynq", dev)) {
 242                 printk("%s: request_irq failed\n", dev->dev.bus_id);
 243                 return -EAGAIN;
 244         }
 245
 246         return 0;
 247 }
 248
 249 static void vlynq_free_irq(struct vlynq_device *dev)
 250 {
 251         free_irq(dev->irq, dev);
 252 }
 253
 254 static void vlynq_device_release(struct device *dev)
 255 {
 256         struct vlynq_device *vdev = to_vlynq_device(dev);
 257         kfree(vdev);
 258 }
 259
 260 static int vlynq_device_probe(struct device *dev)
 261 {
 262         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 263         if (drv->probe)
 264                 return drv->probe(to_vlynq_device(dev));
 265         return 0;
 266 }
 267
 268 static int vlynq_device_remove(struct device *dev)
 269 {
 270         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 271         if (drv->remove)
 272                 return drv->remove(to_vlynq_device(dev));
 273         return 0;
 274 }
 275
 276 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
 277 {
 278         driver->driver.name = driver->name;
 279         driver->driver.bus = &vlynq_bus_type;
 280 /*      driver->driver.owner = owner;*/
 281         return driver_register(&driver->driver);
 282 }
 283 EXPORT_SYMBOL(__vlynq_register_driver);
 284
 285 void vlynq_unregister_driver(struct vlynq_driver *driver)
 286 {
 287         driver_unregister(&driver->driver);
 288 }
 289 EXPORT_SYMBOL(vlynq_unregister_driver);
 290
 291 int vlynq_device_enable(struct vlynq_device *dev)
 292 {
 293         u32 div;
 294         int result;
 295         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 296
 297         result = ops->on(dev);
 298         if (result)
 299                 return result;
 300
 301         vlynq_reg_write(dev->local->control, 0);
 302         vlynq_reg_write(dev->remote->control, 0);
 303
 304 /*
 305         if (vlynq_linked(dev)) {
 306                 printk(KERN_INFO "%s: linked (using external clock)\n",
 307                         dev->dev.bus_id);
 308                 return vlynq_setup_irq(dev);
 309         }
 310 */
 311
 312         for (div = 1; div <= 8; div++) {
 313                 mdelay(20);
 314                 vlynq_reg_write(dev->local->control, VLYNQ_CTRL_CLOCK_INT |
 315                         VLYNQ_CTRL_CLOCK_DIV(div - 1));
 316                 vlynq_reg_write(dev->remote->control, 0);
 317                 if (vlynq_linked(dev)) {
 318                         printk(KERN_INFO "%s: linked (using internal clock, div: %d)\n",
 319                                 dev->dev.bus_id, div);
 320                         return vlynq_setup_irq(dev);
 321                 }
 322         }
 323
 324         return -ENODEV;
 325 }
 326
 327 void vlynq_device_disable(struct vlynq_device *dev)
 328 {
 329         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 330
 331         vlynq_free_irq(dev);
 332         ops->off(dev);
 333 }
 334
 335 u32 vlynq_remote_id(struct vlynq_device *dev)
 336 {
 337         return vlynq_reg_read(dev->remote->chip);
 338 }
 339
 340 void vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
 341                              struct vlynq_mapping *mapping)
 342 {
 343         int i;
 344
 345         vlynq_reg_write(dev->local->tx_offset, tx_offset);
 346         for (i = 0; i < 4; i++) {
 347                 vlynq_reg_write(dev->local->rx_mapping[i].offset, mapping[i].offset);
 348                 vlynq_reg_write(dev->local->rx_mapping[i].size, mapping[i].size);
 349         }
 350 }
 351
 352 void vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
 353                               struct vlynq_mapping *mapping)
 354 {
 355         int i;
 356
 357         vlynq_reg_write(dev->remote->tx_offset, tx_offset);
 358         for (i = 0; i < 4; i++) {
 359                 vlynq_reg_write(dev->remote->rx_mapping[i].offset, mapping[i].offset);
 360                 vlynq_reg_write(dev->remote->rx_mapping[i].size, mapping[i].size);
 361         }
 362 }
 363
 364 int vlynq_virq_to_irq(struct vlynq_device *dev, int virq)
 365 {
 366         if ((virq < 0) || (virq >= PER_DEVICE_IRQS))
 367                 return -EINVAL;
 368
 369         if ((virq == dev->local_irq) || (virq == dev->remote_irq))
 370                 return -EINVAL;
 371
 372         return dev->irq_start + virq;
 373 }
 374
 375 int vlynq_irq_to_virq(struct vlynq_device *dev, int irq)
 376 {
 377         if ((irq < dev->irq_start) || (irq >= dev->irq_start + PER_DEVICE_IRQS))
 378                 return -EINVAL;
 379
 380         return irq - dev->irq_start;
 381 }
 382
 383 int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
 384 {
 385         if ((virq < 0) || (virq >= PER_DEVICE_IRQS))
 386                 return -EINVAL;
 387
 388         if (virq == dev->remote_irq)
 389                 return -EINVAL;
 390
 391         dev->local_irq = virq;
 392
 393         return 0;
 394 }
 395
 396 int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
 397 {
 398         if ((virq < 0) || (virq >= PER_DEVICE_IRQS))
 399                 return -EINVAL;
 400
 401         if (virq == dev->local_irq)
 402                 return -EINVAL;
 403
 404         dev->remote_irq = virq;
 405
 406         return 0;
 407 }
 408
 409 static int vlynq_probe(struct platform_device *pdev)
 410 {
 411         struct vlynq_device *dev;
 412         struct resource *regs_res, *mem_res, *irq_res;
 413         int len, result;
 414
 415         if (strcmp(pdev->name, "vlynq"))
 416                 return -ENODEV;
 417
 418         regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 419         if (!regs_res)
 420                 return -ENODEV;
 421
 422         mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
 423         if (!mem_res)
 424                 return -ENODEV;
 425
 426         irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
 427         if (!irq_res)
 428                 return -ENODEV;
 429
 430         dev = kzalloc(sizeof(struct vlynq_device), GFP_KERNEL);
 431         if (!dev) {
 432                 printk(KERN_ERR "vlynq: failed to allocate device structure\n");
 433                 return -ENOMEM;
 434         }
 435
 436         memset(dev, 0, sizeof(struct vlynq_device));
 437
 438         dev->id = pdev->id;
 439         dev->dev.bus = &vlynq_bus_type;
 440         dev->dev.parent = &pdev->dev;
 441         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "vlynq%d", dev->id);
 442         dev->dev.bus_id[BUS_ID_SIZE - 1] = 0;
 443         dev->dev.platform_data = pdev->dev.platform_data;
 444         dev->dev.release = vlynq_device_release;
 445
 446         dev->regs_start = regs_res->start;
 447         dev->regs_end = regs_res->end;
 448         dev->mem_start = mem_res->start;
 449         dev->mem_end = mem_res->end;
 450
 451         len = regs_res->end - regs_res->start;
 452         if (!request_mem_region(regs_res->start, len, dev->dev.bus_id)) {
 453                 printk("%s: Can't request vlynq registers\n", dev->dev.bus_id);
 454                 result = -ENXIO;
 455                 goto fail_request;
 456         }
 457
 458         dev->local = ioremap_nocache(regs_res->start, len);
 459         if (!dev->local) {
 460                 printk("%s: Can't remap vlynq registers\n", dev->dev.bus_id);
 461                 result = -ENXIO;
 462                 goto fail_remap;
 463         }
 464
 465         dev->remote = (struct vlynq_regs *)((u32)dev->local + 128);
 466
 467         dev->irq = platform_get_irq_byname(pdev, "irq");
 468         dev->irq_start = irq_res->start;
 469         dev->irq_end = irq_res->end;
 470         dev->local_irq = 31;
 471         dev->remote_irq = 30;
 472
 473         if (device_register(&dev->dev))
 474                 goto fail_register;
 475         platform_set_drvdata(pdev, dev);
 476
 477         printk("%s: regs 0x%p, irq %d, mem 0x%p\n",
 478                dev->dev.bus_id, (void *)dev->regs_start, dev->irq,
 479                (void *)dev->mem_start);
 480
 481         return 0;
 482
 483 fail_register:
 484 fail_remap:
 485         iounmap(dev->local);
 486 fail_request:
 487         release_mem_region(regs_res->start, len);
 488         kfree(dev);
 489         return result;
 490 }
 491
 492 static int vlynq_remove(struct platform_device *pdev)
 493 {
 494         struct vlynq_device *dev = platform_get_drvdata(pdev);
 495
 496         device_unregister(&dev->dev);
 497         release_mem_region(dev->regs_start, dev->regs_end - dev->regs_start);
 498
 499         kfree(dev);
 500
 501         return 0;
 502 }
 503
 504 static struct platform_driver vlynq_driver = {
 505         .driver.name = "vlynq",
 506         .probe = vlynq_probe,
 507         .remove = vlynq_remove,
 508 };
 509
 510 struct bus_type vlynq_bus_type = {
 511         .name = "vlynq",
 512         .probe = vlynq_device_probe,
 513         .remove = vlynq_device_remove,
 514 };
 515 EXPORT_SYMBOL(vlynq_bus_type);
 516
 517 #ifdef CONFIG_PCI
 518 extern void vlynq_pci_init(void);
 519 #endif
 520 static int __init vlynq_init(void)
 521 {
 522         int res = 0;
 523
 524         res = bus_register(&vlynq_bus_type);
 525         if (res)
 526                 goto fail_bus;
 527
 528         res = platform_driver_register(&vlynq_driver);
 529         if (res)
 530                 goto fail_platform;
 531
 532 #ifdef CONFIG_PCI
 533         vlynq_pci_init();
 534 #endif
 535
 536         return 0;
 537
 538 fail_platform:
 539         bus_unregister(&vlynq_bus_type);
 540 fail_bus:
 541         return res;
 542 }
 543
 544 /*
 545 void __devexit vlynq_exit(void)
 546 {
 547         platform_driver_unregister(&vlynq_driver);
 548         bus_unregister(&vlynq_bus_type);
 549 }
 550 */
 551
 552
 553 subsys_initcall(vlynq_init);