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_RERROR        0x00000100
  50 #define VLYNQ_STATUS_LERROR        0x00000080
  51 #define VLYNQ_STATUS_LINK          0x00000001
  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         volatile u32 revision;
  63         volatile u32 control;
  64         volatile u32 status;
  65         volatile u32 int_prio;
  66         volatile u32 int_status;
  67         volatile u32 int_pending;
  68         volatile u32 int_ptr;
  69         volatile u32 tx_offset;
  70         volatile struct vlynq_mapping rx_mapping[4];
  71         volatile u32 chip;
  72         volatile u32 autonego;
  73         volatile u32 unused[6];
  74         volatile u32 int_device[8];
  75 } __attribute__ ((packed));
  76
  77 #ifdef VLYNQ_DEBUG
  78 static void vlynq_dump_regs(struct vlynq_device *dev)
  79 {
  80         int i;
  81         printk("VLYNQ local=%p remote=%p\n", dev->local, dev->remote);
  82         for (i = 0; i < 32; i++) {
  83                 printk("VLYNQ: local %d: %08x\n", i + 1, ((u32 *)dev->local)[i]);
  84                 printk("VLYNQ: remote %d: %08x\n", i + 1, ((u32 *)dev->remote)[i]);
  85         }
  86 }
  87
  88 static void vlynq_dump_mem(u32 *base, int count)
  89 {
  90         int i;
  91         for (i = 0; i < (count + 3) / 4; i++) {
  92                 if (i % 4 == 0) printk("\nMEM[0x%04x]:", i * 4);
  93                 printk(" 0x%08x", *(base + i));
  94         }
  95         printk("\n");
  96 }
  97 #endif
  98
  99 int vlynq_linked(struct vlynq_device *dev)
 100 {
 101         int i;
 102         for (i = 0; i < 10; i++)
 103                 if (dev->local->status & VLYNQ_STATUS_LINK) {
 104                         printk("%s: linked\n", dev->dev.bus_id);
 105                         return 1;
 106                 } else {
 107                         mdelay(1);
 108                 }
 109         return 0;
 110 }
 111
 112 static void vlynq_irq_unmask(unsigned int irq)
 113 {
 114         volatile u32 val;
 115         struct vlynq_device *dev = irq_desc[irq].chip_data;
 116         int virq;
 117
 118         BUG_ON(!dev);
 119         virq = irq - dev->irq_start;
 120         val = dev->remote->int_device[virq >> 2];
 121         val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
 122         dev->remote->int_device[virq >> 2] = val;
 123 }
 124
 125 static void vlynq_irq_mask(unsigned int irq)
 126 {
 127         volatile u32 val;
 128         struct vlynq_device *dev = irq_desc[irq].chip_data;
 129         int virq;
 130
 131         BUG_ON(!dev);
 132         virq = irq - dev->irq_start;
 133         val = dev->remote->int_device[virq >> 2];
 134         val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
 135         dev->remote->int_device[virq >> 2] = val;
 136 }
 137
 138 static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
 139 {
 140         volatile u32 val;
 141         struct vlynq_device *dev = irq_desc[irq].chip_data;
 142         int virq;
 143
 144         BUG_ON(!dev);
 145         virq = irq - dev->irq_start;
 146         val = dev->remote->int_device[virq >> 2];
 147         switch (flow_type & IRQ_TYPE_SENSE_MASK) {
 148         case IRQ_TYPE_EDGE_RISING:
 149         case IRQ_TYPE_EDGE_FALLING:
 150         case IRQ_TYPE_EDGE_BOTH:
 151                 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
 152                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 153                 break;
 154         case IRQ_TYPE_LEVEL_HIGH:
 155                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 156                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 157                 break;
 158         case IRQ_TYPE_LEVEL_LOW:
 159                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 160                 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
 161                 break;
 162         default:
 163                 return -EINVAL;
 164         }
 165         dev->remote->int_device[virq >> 2] = val;
 166         return 0;
 167 }
 168
 169 static irqreturn_t vlynq_irq(int irq, void *dev_id)
 170 {
 171         struct vlynq_device *dev = dev_id;
 172         u32 status, ack;
 173         int virq = 0;
 174
 175         status = dev->local->int_status;
 176         dev->local->int_status = status;
 177
 178         if (status & (1 << dev->local_irq)) { /* Local vlynq IRQ. Ack */
 179                 ack = dev->local->status;
 180                 dev->local->status = ack;
 181         }
 182
 183         if (status & (1 << dev->remote_irq)) { /* Remote vlynq IRQ. Ack */
 184                 ack = dev->remote->status;
 185                 dev->remote->status = ack;
 186         }
 187
 188         status &= ~((1 << dev->local_irq) | (1 << dev->remote_irq));
 189         while (status) {
 190                 if (status & 1) /* Remote device IRQ. Pass. */
 191                         do_IRQ(dev->irq_start + virq);
 192                 status >>= 1;
 193                 virq++;
 194         }
 195
 196         return IRQ_HANDLED;
 197 }
 198
 199 static struct irq_chip vlynq_irq_chip = {
 200         .typename = "VLYNQ",
 201         .name = "vlynq",
 202         .unmask = vlynq_irq_unmask,
 203         .mask = vlynq_irq_mask,
 204         .set_type = vlynq_irq_type,
 205 };
 206
 207 static int vlynq_setup_irq(struct vlynq_device *dev)
 208 {
 209         u32 val;
 210         int i;
 211
 212         if (dev->local_irq == dev->remote_irq) {
 213                 printk("%s: local vlynq irq should be different from remote\n",
 214                        dev->dev.bus_id);
 215                 return -EINVAL;
 216         }
 217
 218         val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
 219         val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
 220                 VLYNQ_CTRL_INT2CFG;
 221         dev->local->int_ptr = 0x14;
 222         dev->local->control |= val;
 223
 224         val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
 225         val |= VLYNQ_CTRL_INT_ENABLE;
 226         dev->remote->int_ptr = 0x14;
 227         dev->remote->control |= val;
 228
 229         for (i = 0; i < PER_DEVICE_IRQS; i++) {
 230                 if ((i == dev->local_irq) || (i == dev->remote_irq))
 231                         continue;
 232                 irq_desc[dev->irq_start + i].status = IRQ_DISABLED;
 233                 irq_desc[dev->irq_start + i].action = 0;
 234                 irq_desc[dev->irq_start + i].depth = 1;
 235                 irq_desc[dev->irq_start + i].chip = &vlynq_irq_chip;
 236                 irq_desc[dev->irq_start + i].chip_data = dev;
 237                 dev->remote->int_device[i >> 2] = 0;
 238         }
 239
 240         if (request_irq(dev->irq, vlynq_irq, SA_SHIRQ, "vlynq", dev)) {
 241                 printk("%s: request_irq failed\n", dev->dev.bus_id);
 242                 return -EAGAIN;
 243         }
 244
 245         return 0;
 246 }
 247
 248 static void vlynq_free_irq(struct vlynq_device *dev)
 249 {
 250         free_irq(dev->irq, dev);
 251 }
 252
 253 static void vlynq_device_release(struct device *dev)
 254 {
 255         struct vlynq_device *vdev = to_vlynq_device(dev);
 256         kfree(vdev);
 257 }
 258
 259 static int vlynq_device_probe(struct device *dev)
 260 {
 261         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 262         if (drv->probe)
 263                 return drv->probe(to_vlynq_device(dev));
 264         return 0;
 265 }
 266
 267 static int vlynq_device_remove(struct device *dev)
 268 {
 269         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 270         if (drv->remove)
 271                 return drv->remove(to_vlynq_device(dev));
 272         return 0;
 273 }
 274
 275 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
 276 {
 277         driver->driver.name = driver->name;
 278         driver->driver.bus = &vlynq_bus_type;
 279 /*      driver->driver.owner = owner;*/
 280         return driver_register(&driver->driver);
 281 }
 282 EXPORT_SYMBOL(__vlynq_register_driver);
 283
 284 void vlynq_unregister_driver(struct vlynq_driver *driver)
 285 {
 286         driver_unregister(&driver->driver);
 287 }
 288 EXPORT_SYMBOL(vlynq_unregister_driver);
 289
 290 int vlynq_device_enable(struct vlynq_device *dev)
 291 {
 292         u32 div;
 293         int result;
 294         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 295
 296         result = ops->on(dev);
 297         if (result)
 298                 return result;
 299
 300         dev->local->control = 0;
 301         dev->remote->control = 0;
 302         dev->local->control = VLYNQ_CTRL_CLOCK_INT;
 303
 304         div = ar7_dsp_freq() / 62500000;
 305         if (div != 0 ) {
 306                 if (ar7_dsp_freq() / div != 62500000) {
 307                         printk(KERN_WARNING
 308                                 "VLYNQ: Adjusted requested frequency %d to %d\n",
 309                                 62500000, ar7_dsp_freq() / div);
 310                 }
 311
 312                 printk("VLYNQ: Setting clock to %d (clock divider %u)\n",
 313                         ar7_dsp_freq() / div, div);
 314                 dev->local->control |= VLYNQ_CTRL_CLOCK_DIV((div - 1));
 315         }
 316         if (vlynq_linked(dev))
 317                 return vlynq_setup_irq(dev);
 318
 319         return -ENODEV;
 320 }
 321
 322 void vlynq_device_disable(struct vlynq_device *dev)
 323 {
 324         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 325
 326         vlynq_free_irq(dev);
 327         ops->off(dev);
 328 }
 329
 330 u32 vlynq_local_id(struct vlynq_device *dev)
 331 {
 332         return dev->local->chip;
 333 }
 334
 335 u32 vlynq_remote_id(struct vlynq_device *dev)
 336 {
 337         return 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         dev->local->tx_offset = tx_offset;
 346         for (i = 0; i < 4; i++) {
 347                 dev->local->rx_mapping[i].offset = mapping[i].offset;
 348                 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         dev->remote->tx_offset = tx_offset;
 358         for (i = 0; i < 4; i++) {
 359                 dev->remote->rx_mapping[i].offset = mapping[i].offset;
 360                 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 = kmalloc(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 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);