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   1 /*
   2  *  vrc4173.c, NEC VRC4173 base driver for NEC VR4122/VR4131.
   3  *
   4  *  Copyright (C) 2001-2003  MontaVista Software Inc.
   5  *    Author: Yoichi Yuasa <yyuasa@mvista.com, or source@mvista.com>
   6  *  Copyright (C) 2004  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
   7  *  Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/irq.h>
  27 #include <linux/pci.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/types.h>
  30
  31 #include <asm/vr41xx/vr41xx.h>
  32 #include <asm/vr41xx/vrc4173.h>
  33
  34 MODULE_DESCRIPTION("NEC VRC4173 base driver for NEC VR4122/4131");
  35 MODULE_AUTHOR("Yoichi Yuasa <yyuasa@mvista.com>");
  36 MODULE_LICENSE("GPL");
  37
  38 #define VRC4173_CMUCLKMSK       0x040
  39  #define MSKPIU                 0x0001
  40  #define MSKKIU                 0x0002
  41  #define MSKAIU                 0x0004
  42  #define MSKPS2CH1              0x0008
  43  #define MSKPS2CH2              0x0010
  44  #define MSKUSB                 0x0020
  45  #define MSKCARD1               0x0040
  46  #define MSKCARD2               0x0080
  47  #define MSKAC97                0x0100
  48  #define MSK48MUSB              0x0400
  49  #define MSK48MPIN              0x0800
  50  #define MSK48MOSC              0x1000
  51 #define VRC4173_CMUSRST         0x042
  52  #define USBRST                 0x0001
  53  #define CARD1RST               0x0002
  54  #define CARD2RST               0x0004
  55  #define AC97RST                0x0008
  56
  57 #define VRC4173_SYSINT1REG      0x060
  58 #define VRC4173_MSYSINT1REG     0x06c
  59 #define VRC4173_MPIUINTREG      0x06e
  60 #define VRC4173_MAIUINTREG      0x070
  61 #define VRC4173_MKIUINTREG      0x072
  62
  63 #define VRC4173_SELECTREG       0x09e
  64  #define SEL3                   0x0008
  65  #define SEL2                   0x0004
  66  #define SEL1                   0x0002
  67  #define SEL0                   0x0001
  68
  69 static struct pci_device_id vrc4173_id_table[] __devinitdata = {
  70         {       .vendor         = PCI_VENDOR_ID_NEC,
  71                 .device         = PCI_DEVICE_ID_NEC_VRC4173,
  72                 .subvendor      = PCI_ANY_ID,
  73                 .subdevice      = PCI_ANY_ID,                   },
  74         {       .vendor         = 0,                            },
  75 };
  76
  77 unsigned long vrc4173_io_offset = 0;
  78
  79 EXPORT_SYMBOL(vrc4173_io_offset);
  80
  81 static int vrc4173_initialized;
  82 static uint16_t vrc4173_cmuclkmsk;
  83 static uint16_t vrc4173_selectreg;
  84 static DEFINE_SPINLOCK(vrc4173_cmu_lock);
  85 static DEFINE_SPINLOCK(vrc4173_giu_lock);
  86
  87 static inline void set_cmusrst(uint16_t val)
  88 {
  89         uint16_t cmusrst;
  90
  91         cmusrst = vrc4173_inw(VRC4173_CMUSRST);
  92         cmusrst |= val;
  93         vrc4173_outw(cmusrst, VRC4173_CMUSRST);
  94 }
  95
  96 static inline void clear_cmusrst(uint16_t val)
  97 {
  98         uint16_t cmusrst;
  99
 100         cmusrst = vrc4173_inw(VRC4173_CMUSRST);
 101         cmusrst &= ~val;
 102         vrc4173_outw(cmusrst, VRC4173_CMUSRST);
 103 }
 104
 105 void vrc4173_supply_clock(vrc4173_clock_t clock)
 106 {
 107         if (vrc4173_initialized) {
 108                 spin_lock_irq(&vrc4173_cmu_lock);
 109
 110                 switch (clock) {
 111                 case VRC4173_PIU_CLOCK:
 112                         vrc4173_cmuclkmsk |= MSKPIU;
 113                         break;
 114                 case VRC4173_KIU_CLOCK:
 115                         vrc4173_cmuclkmsk |= MSKKIU;
 116                         break;
 117                 case VRC4173_AIU_CLOCK:
 118                         vrc4173_cmuclkmsk |= MSKAIU;
 119                         break;
 120                 case VRC4173_PS2_CH1_CLOCK:
 121                         vrc4173_cmuclkmsk |= MSKPS2CH1;
 122                         break;
 123                 case VRC4173_PS2_CH2_CLOCK:
 124                         vrc4173_cmuclkmsk |= MSKPS2CH2;
 125                         break;
 126                 case VRC4173_USBU_PCI_CLOCK:
 127                         set_cmusrst(USBRST);
 128                         vrc4173_cmuclkmsk |= MSKUSB;
 129                         break;
 130                 case VRC4173_CARDU1_PCI_CLOCK:
 131                         set_cmusrst(CARD1RST);
 132                         vrc4173_cmuclkmsk |= MSKCARD1;
 133                         break;
 134                 case VRC4173_CARDU2_PCI_CLOCK:
 135                         set_cmusrst(CARD2RST);
 136                         vrc4173_cmuclkmsk |= MSKCARD2;
 137                         break;
 138                 case VRC4173_AC97U_PCI_CLOCK:
 139                         set_cmusrst(AC97RST);
 140                         vrc4173_cmuclkmsk |= MSKAC97;
 141                         break;
 142                 case VRC4173_USBU_48MHz_CLOCK:
 143                         set_cmusrst(USBRST);
 144                         vrc4173_cmuclkmsk |= MSK48MUSB;
 145                         break;
 146                 case VRC4173_EXT_48MHz_CLOCK:
 147                         if (vrc4173_cmuclkmsk & MSK48MOSC)
 148                                 vrc4173_cmuclkmsk |= MSK48MPIN;
 149                         else
 150                                 printk(KERN_WARNING
 151                                        "vrc4173_supply_clock: "
 152                                        "Please supply VRC4173_48MHz_CLOCK first "
 153                                        "rather than VRC4173_EXT_48MHz_CLOCK.\n");
 154                         break;
 155                 case VRC4173_48MHz_CLOCK:
 156                         vrc4173_cmuclkmsk |= MSK48MOSC;
 157                         break;
 158                 default:
 159                         printk(KERN_WARNING
 160                                "vrc4173_supply_clock: Invalid CLOCK value %u\n", clock);
 161                         break;
 162                 }
 163
 164                 vrc4173_outw(vrc4173_cmuclkmsk, VRC4173_CMUCLKMSK);
 165
 166                 switch (clock) {
 167                 case VRC4173_USBU_PCI_CLOCK:
 168                 case VRC4173_USBU_48MHz_CLOCK:
 169                         clear_cmusrst(USBRST);
 170                         break;
 171                 case VRC4173_CARDU1_PCI_CLOCK:
 172                         clear_cmusrst(CARD1RST);
 173                         break;
 174                 case VRC4173_CARDU2_PCI_CLOCK:
 175                         clear_cmusrst(CARD2RST);
 176                         break;
 177                 case VRC4173_AC97U_PCI_CLOCK:
 178                         clear_cmusrst(AC97RST);
 179                         break;
 180                 default:
 181                         break;
 182                 }
 183
 184                 spin_unlock_irq(&vrc4173_cmu_lock);
 185         }
 186 }
 187
 188 EXPORT_SYMBOL(vrc4173_supply_clock);
 189
 190 void vrc4173_mask_clock(vrc4173_clock_t clock)
 191 {
 192         if (vrc4173_initialized) {
 193                 spin_lock_irq(&vrc4173_cmu_lock);
 194
 195                 switch (clock) {
 196                 case VRC4173_PIU_CLOCK:
 197                         vrc4173_cmuclkmsk &= ~MSKPIU;
 198                         break;
 199                 case VRC4173_KIU_CLOCK:
 200                         vrc4173_cmuclkmsk &= ~MSKKIU;
 201                         break;
 202                 case VRC4173_AIU_CLOCK:
 203                         vrc4173_cmuclkmsk &= ~MSKAIU;
 204                         break;
 205                 case VRC4173_PS2_CH1_CLOCK:
 206                         vrc4173_cmuclkmsk &= ~MSKPS2CH1;
 207                         break;
 208                 case VRC4173_PS2_CH2_CLOCK:
 209                         vrc4173_cmuclkmsk &= ~MSKPS2CH2;
 210                         break;
 211                 case VRC4173_USBU_PCI_CLOCK:
 212                         set_cmusrst(USBRST);
 213                         vrc4173_cmuclkmsk &= ~MSKUSB;
 214                         break;
 215                 case VRC4173_CARDU1_PCI_CLOCK:
 216                         set_cmusrst(CARD1RST);
 217                         vrc4173_cmuclkmsk &= ~MSKCARD1;
 218                         break;
 219                 case VRC4173_CARDU2_PCI_CLOCK:
 220                         set_cmusrst(CARD2RST);
 221                         vrc4173_cmuclkmsk &= ~MSKCARD2;
 222                         break;
 223                 case VRC4173_AC97U_PCI_CLOCK:
 224                         set_cmusrst(AC97RST);
 225                         vrc4173_cmuclkmsk &= ~MSKAC97;
 226                         break;
 227                 case VRC4173_USBU_48MHz_CLOCK:
 228                         set_cmusrst(USBRST);
 229                         vrc4173_cmuclkmsk &= ~MSK48MUSB;
 230                         break;
 231                 case VRC4173_EXT_48MHz_CLOCK:
 232                         vrc4173_cmuclkmsk &= ~MSK48MPIN;
 233                         break;
 234                 case VRC4173_48MHz_CLOCK:
 235                         vrc4173_cmuclkmsk &= ~MSK48MOSC;
 236                         break;
 237                 default:
 238                         printk(KERN_WARNING "vrc4173_mask_clock: Invalid CLOCK value %u\n", clock);
 239                         break;
 240                 }
 241
 242                 vrc4173_outw(vrc4173_cmuclkmsk, VRC4173_CMUCLKMSK);
 243
 244                 switch (clock) {
 245                 case VRC4173_USBU_PCI_CLOCK:
 246                 case VRC4173_USBU_48MHz_CLOCK:
 247                         clear_cmusrst(USBRST);
 248                         break;
 249                 case VRC4173_CARDU1_PCI_CLOCK:
 250                         clear_cmusrst(CARD1RST);
 251                         break;
 252                 case VRC4173_CARDU2_PCI_CLOCK:
 253                         clear_cmusrst(CARD2RST);
 254                         break;
 255                 case VRC4173_AC97U_PCI_CLOCK:
 256                         clear_cmusrst(AC97RST);
 257                         break;
 258                 default:
 259                         break;
 260                 }
 261
 262                 spin_unlock_irq(&vrc4173_cmu_lock);
 263         }
 264 }
 265
 266 EXPORT_SYMBOL(vrc4173_mask_clock);
 267
 268 static inline void vrc4173_cmu_init(void)
 269 {
 270         vrc4173_cmuclkmsk = vrc4173_inw(VRC4173_CMUCLKMSK);
 271
 272         spin_lock_init(&vrc4173_cmu_lock);
 273 }
 274
 275 void vrc4173_select_function(vrc4173_function_t function)
 276 {
 277         if (vrc4173_initialized) {
 278                 spin_lock_irq(&vrc4173_giu_lock);
 279
 280                 switch(function) {
 281                 case PS2_CHANNEL1:
 282                         vrc4173_selectreg |= SEL2;
 283                         break;
 284                 case PS2_CHANNEL2:
 285                         vrc4173_selectreg |= SEL1;
 286                         break;
 287                 case TOUCHPANEL:
 288                         vrc4173_selectreg &= SEL2 | SEL1 | SEL0;
 289                         break;
 290                 case KEYBOARD_8SCANLINES:
 291                         vrc4173_selectreg &= SEL3 | SEL2 | SEL1;
 292                         break;
 293                 case KEYBOARD_10SCANLINES:
 294                         vrc4173_selectreg &= SEL3 | SEL2;
 295                         break;
 296                 case KEYBOARD_12SCANLINES:
 297                         vrc4173_selectreg &= SEL3;
 298                         break;
 299                 case GPIO_0_15PINS:
 300                         vrc4173_selectreg |= SEL0;
 301                         break;
 302                 case GPIO_16_20PINS:
 303                         vrc4173_selectreg |= SEL3;
 304                         break;
 305                 }
 306
 307                 vrc4173_outw(vrc4173_selectreg, VRC4173_SELECTREG);
 308
 309                 spin_unlock_irq(&vrc4173_giu_lock);
 310         }
 311 }
 312
 313 EXPORT_SYMBOL(vrc4173_select_function);
 314
 315 static inline void vrc4173_giu_init(void)
 316 {
 317         vrc4173_selectreg = vrc4173_inw(VRC4173_SELECTREG);
 318
 319         spin_lock_init(&vrc4173_giu_lock);
 320 }
 321
 322 void vrc4173_enable_piuint(uint16_t mask)
 323 {
 324         irq_desc_t *desc = irq_desc + VRC4173_PIU_IRQ;
 325         unsigned long flags;
 326         uint16_t val;
 327
 328         spin_lock_irqsave(&desc->lock, flags);
 329         val = vrc4173_inw(VRC4173_MPIUINTREG);
 330         val |= mask;
 331         vrc4173_outw(val, VRC4173_MPIUINTREG);
 332         spin_unlock_irqrestore(&desc->lock, flags);
 333 }
 334
 335 EXPORT_SYMBOL(vrc4173_enable_piuint);
 336
 337 void vrc4173_disable_piuint(uint16_t mask)
 338 {
 339         irq_desc_t *desc = irq_desc + VRC4173_PIU_IRQ;
 340         unsigned long flags;
 341         uint16_t val;
 342
 343         spin_lock_irqsave(&desc->lock, flags);
 344         val = vrc4173_inw(VRC4173_MPIUINTREG);
 345         val &= ~mask;
 346         vrc4173_outw(val, VRC4173_MPIUINTREG);
 347         spin_unlock_irqrestore(&desc->lock, flags);
 348 }
 349
 350 EXPORT_SYMBOL(vrc4173_disable_piuint);
 351
 352 void vrc4173_enable_aiuint(uint16_t mask)
 353 {
 354         irq_desc_t *desc = irq_desc + VRC4173_AIU_IRQ;
 355         unsigned long flags;
 356         uint16_t val;
 357
 358         spin_lock_irqsave(&desc->lock, flags);
 359         val = vrc4173_inw(VRC4173_MAIUINTREG);
 360         val |= mask;
 361         vrc4173_outw(val, VRC4173_MAIUINTREG);
 362         spin_unlock_irqrestore(&desc->lock, flags);
 363 }
 364
 365 EXPORT_SYMBOL(vrc4173_enable_aiuint);
 366
 367 void vrc4173_disable_aiuint(uint16_t mask)
 368 {
 369         irq_desc_t *desc = irq_desc + VRC4173_AIU_IRQ;
 370         unsigned long flags;
 371         uint16_t val;
 372
 373         spin_lock_irqsave(&desc->lock, flags);
 374         val = vrc4173_inw(VRC4173_MAIUINTREG);
 375         val &= ~mask;
 376         vrc4173_outw(val, VRC4173_MAIUINTREG);
 377         spin_unlock_irqrestore(&desc->lock, flags);
 378 }
 379
 380 EXPORT_SYMBOL(vrc4173_disable_aiuint);
 381
 382 void vrc4173_enable_kiuint(uint16_t mask)
 383 {
 384         irq_desc_t *desc = irq_desc + VRC4173_KIU_IRQ;
 385         unsigned long flags;
 386         uint16_t val;
 387
 388         spin_lock_irqsave(&desc->lock, flags);
 389         val = vrc4173_inw(VRC4173_MKIUINTREG);
 390         val |= mask;
 391         vrc4173_outw(val, VRC4173_MKIUINTREG);
 392         spin_unlock_irqrestore(&desc->lock, flags);
 393 }
 394
 395 EXPORT_SYMBOL(vrc4173_enable_kiuint);
 396
 397 void vrc4173_disable_kiuint(uint16_t mask)
 398 {
 399         irq_desc_t *desc = irq_desc + VRC4173_KIU_IRQ;
 400         unsigned long flags;
 401         uint16_t val;
 402
 403         spin_lock_irqsave(&desc->lock, flags);
 404         val = vrc4173_inw(VRC4173_MKIUINTREG);
 405         val &= ~mask;
 406         vrc4173_outw(val, VRC4173_MKIUINTREG);
 407         spin_unlock_irqrestore(&desc->lock, flags);
 408 }
 409
 410 EXPORT_SYMBOL(vrc4173_disable_kiuint);
 411
 412 static void enable_vrc4173_irq(unsigned int irq)
 413 {
 414         uint16_t val;
 415
 416         val = vrc4173_inw(VRC4173_MSYSINT1REG);
 417         val |= (uint16_t)1 << (irq - VRC4173_IRQ_BASE);
 418         vrc4173_outw(val, VRC4173_MSYSINT1REG);
 419 }
 420
 421 static void disable_vrc4173_irq(unsigned int irq)
 422 {
 423         uint16_t val;
 424
 425         val = vrc4173_inw(VRC4173_MSYSINT1REG);
 426         val &= ~((uint16_t)1 << (irq - VRC4173_IRQ_BASE));
 427         vrc4173_outw(val, VRC4173_MSYSINT1REG);
 428 }
 429
 430 static unsigned int startup_vrc4173_irq(unsigned int irq)
 431 {
 432         enable_vrc4173_irq(irq);
 433         return 0; /* never anything pending */
 434 }
 435
 436 #define shutdown_vrc4173_irq    disable_vrc4173_irq
 437 #define ack_vrc4173_irq         disable_vrc4173_irq
 438
 439 static void end_vrc4173_irq(unsigned int irq)
 440 {
 441         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
 442                 enable_vrc4173_irq(irq);
 443 }
 444
 445 static struct hw_interrupt_type vrc4173_irq_type = {
 446         .typename       = "VRC4173",
 447         .startup        = startup_vrc4173_irq,
 448         .shutdown       = shutdown_vrc4173_irq,
 449         .enable         = enable_vrc4173_irq,
 450         .disable        = disable_vrc4173_irq,
 451         .ack            = ack_vrc4173_irq,
 452         .end            = end_vrc4173_irq,
 453 };
 454
 455 static int vrc4173_get_irq_number(int irq)
 456 {
 457         uint16_t status, mask;
 458         int i;
 459
 460         status = vrc4173_inw(VRC4173_SYSINT1REG);
 461         mask = vrc4173_inw(VRC4173_MSYSINT1REG);
 462
 463         status &= mask;
 464         if (status) {
 465                 for (i = 0; i < 16; i++)
 466                         if (status & (0x0001 << i))
 467                                 return VRC4173_IRQ(i);
 468         }
 469
 470         return -EINVAL;
 471 }
 472
 473 static inline int vrc4173_icu_init(int cascade_irq)
 474 {
 475         int i;
 476
 477         if (cascade_irq < GIU_IRQ(0) || cascade_irq > GIU_IRQ(15))
 478                 return -EINVAL;
 479
 480         vrc4173_outw(0, VRC4173_MSYSINT1REG);
 481
 482         vr41xx_set_irq_trigger(GIU_IRQ_TO_PIN(cascade_irq), TRIGGER_LEVEL, SIGNAL_THROUGH);
 483         vr41xx_set_irq_level(GIU_IRQ_TO_PIN(cascade_irq), LEVEL_LOW);
 484
 485         for (i = VRC4173_IRQ_BASE; i <= VRC4173_IRQ_LAST; i++)
 486                 irq_desc[i].handler = &vrc4173_irq_type;
 487
 488         return 0;
 489 }
 490
 491 static int __devinit vrc4173_probe(struct pci_dev *dev,
 492                                    const struct pci_device_id *id)
 493 {
 494         unsigned long start, flags;
 495         int err;
 496
 497         err = pci_enable_device(dev);
 498         if (err < 0) {
 499                 printk(KERN_ERR "vrc4173: Failed to enable PCI device, aborting\n");
 500                 return err;
 501         }
 502
 503         pci_set_master(dev);
 504
 505         start = pci_resource_start(dev, 0);
 506         if (start == 0) {
 507                 printk(KERN_ERR "vrc4173:No such PCI I/O resource, aborting\n");
 508                 return -ENXIO;
 509         }
 510
 511         flags = pci_resource_flags(dev, 0);
 512         if ((flags & IORESOURCE_IO) == 0) {
 513                 printk(KERN_ERR "vrc4173: No such PCI I/O resource, aborting\n");
 514                 return -ENXIO;
 515         }
 516
 517         err = pci_request_regions(dev, "NEC VRC4173");
 518         if (err < 0) {
 519                 printk(KERN_ERR "vrc4173: PCI resources are busy, aborting\n");
 520                 return err;
 521         }
 522
 523         set_vrc4173_io_offset(start);
 524
 525         vrc4173_cmu_init();
 526         vrc4173_giu_init();
 527
 528         err = vrc4173_icu_init(dev->irq);
 529         if (err < 0) {
 530                 printk(KERN_ERR "vrc4173: Invalid IRQ %d, aborting\n", dev->irq);
 531                 return err;
 532         }
 533
 534         err = vr41xx_cascade_irq(dev->irq, vrc4173_get_irq_number);
 535         if (err < 0) {
 536                 printk(KERN_ERR "vrc4173: IRQ resource %d is busy, aborting\n", dev->irq);
 537                 return err;
 538         }
 539
 540         printk(KERN_INFO
 541                "NEC VRC4173 at 0x%#08lx, IRQ is cascaded to %d\n", start, dev->irq);
 542
 543         return 0;
 544 }
 545
 546 static void vrc4173_remove(struct pci_dev *dev)
 547 {
 548         free_irq(dev->irq, NULL);
 549
 550         pci_release_regions(dev);
 551 }
 552
 553 static struct pci_driver vrc4173_driver = {
 554         .name           = "NEC VRC4173",
 555         .probe          = vrc4173_probe,
 556         .remove         = vrc4173_remove,
 557         .id_table       = vrc4173_id_table,
 558 };
 559
 560 static int __devinit vrc4173_init(void)
 561 {
 562         int err;
 563
 564         err = pci_register_driver(&vrc4173_driver);
 565         if (err < 0)
 566                 return err;
 567
 568         vrc4173_initialized = 1;
 569
 570         return 0;
 571 }
 572
 573 static void __devexit vrc4173_exit(void)
 574 {
 575         vrc4173_initialized = 0;
 576
 577         pci_unregister_driver(&vrc4173_driver);
 578 }
 579
 580 module_init(vrc4173_init);
 581 module_exit(vrc4173_exit);