drivers/macintosh/via-pmu68k.c

   1 /*
   2  * Device driver for the PMU on 68K-based Apple PowerBooks
   3  *
   4  * The VIA (versatile interface adapter) interfaces to the PMU,
   5  * a 6805 microprocessor core whose primary function is to control
   6  * battery charging and system power on the PowerBooks.
   7  * The PMU also controls the ADB (Apple Desktop Bus) which connects
   8  * to the keyboard and mouse, as well as the non-volatile RAM
   9  * and the RTC (real time clock) chip.
  10  *
  11  * Adapted for 68K PMU by Joshua M. Thompson
  12  *
  13  * Based largely on the PowerMac PMU code by Paul Mackerras and
  14  * Fabio Riccardi.
  15  *
  16  * Also based on the PMU driver from MkLinux by Apple Computer, Inc.
  17  * and the Open Software Foundation, Inc.
  18  */
  19
  20 #include <stdarg.h>
  21 #include <linux/types.h>
  22 #include <linux/errno.h>
  23 #include <linux/kernel.h>
  24 #include <linux/delay.h>
  25 #include <linux/miscdevice.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/pci.h>
  28 #include <linux/slab.h>
  29 #include <linux/init.h>
  30 #include <linux/interrupt.h>
  31
  32 #include <linux/adb.h>
  33 #include <linux/pmu.h>
  34 #include <linux/cuda.h>
  35
  36 #include <asm/macintosh.h>
  37 #include <asm/macints.h>
  38 #include <asm/machw.h>
  39 #include <asm/mac_via.h>
  40
  41 #include <asm/pgtable.h>
  42 #include <asm/system.h>
  43 #include <asm/irq.h>
  44 #include <asm/uaccess.h>
  45
  46 /* Misc minor number allocated for /dev/pmu */
  47 #define PMU_MINOR       154
  48
  49 /* VIA registers - spaced 0x200 bytes apart */
  50 #define RS              0x200           /* skip between registers */
  51 #define B               0               /* B-side data */
  52 #define A               RS              /* A-side data */
  53 #define DIRB            (2*RS)          /* B-side direction (1=output) */
  54 #define DIRA            (3*RS)          /* A-side direction (1=output) */
  55 #define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
  56 #define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
  57 #define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
  58 #define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
  59 #define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
  60 #define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
  61 #define SR              (10*RS)         /* Shift register */
  62 #define ACR             (11*RS)         /* Auxiliary control register */
  63 #define PCR             (12*RS)         /* Peripheral control register */
  64 #define IFR             (13*RS)         /* Interrupt flag register */
  65 #define IER             (14*RS)         /* Interrupt enable register */
  66 #define ANH             (15*RS)         /* A-side data, no handshake */
  67
  68 /* Bits in B data register: both active low */
  69 #define TACK            0x02            /* Transfer acknowledge (input) */
  70 #define TREQ            0x04            /* Transfer request (output) */
  71
  72 /* Bits in ACR */
  73 #define SR_CTRL         0x1c            /* Shift register control bits */
  74 #define SR_EXT          0x0c            /* Shift on external clock */
  75 #define SR_OUT          0x10            /* Shift out if 1 */
  76
  77 /* Bits in IFR and IER */
  78 #define SR_INT          0x04            /* Shift register full/empty */
  79 #define CB1_INT         0x10            /* transition on CB1 input */
  80
  81 static enum pmu_state {
  82         idle,
  83         sending,
  84         intack,
  85         reading,
  86         reading_intr,
  87 } pmu_state;
  88
  89 static struct adb_request *current_req;
  90 static struct adb_request *last_req;
  91 static struct adb_request *req_awaiting_reply;
  92 static unsigned char interrupt_data[32];
  93 static unsigned char *reply_ptr;
  94 static int data_index;
  95 static int data_len;
  96 static int adb_int_pending;
  97 static int pmu_adb_flags;
  98 static int adb_dev_map;
  99 static struct adb_request bright_req_1, bright_req_2, bright_req_3;
 100 static int pmu_kind = PMU_UNKNOWN;
 101 static int pmu_fully_inited;
 102
 103 int asleep;
 104 BLOCKING_NOTIFIER_HEAD(sleep_notifier_list);
 105
 106 static int pmu_probe(void);
 107 static int pmu_init(void);
 108 static void pmu_start(void);
 109 static irqreturn_t pmu_interrupt(int irq, void *arg);
 110 static int pmu_send_request(struct adb_request *req, int sync);
 111 static int pmu_autopoll(int devs);
 112 void pmu_poll(void);
 113 static int pmu_reset_bus(void);
 114 static int pmu_queue_request(struct adb_request *req);
 115
 116 static void pmu_start(void);
 117 static void send_byte(int x);
 118 static void recv_byte(void);
 119 static void pmu_done(struct adb_request *req);
 120 static void pmu_handle_data(unsigned char *data, int len);
 121 static void set_volume(int level);
 122 static void pmu_enable_backlight(int on);
 123 static void pmu_set_brightness(int level);
 124
 125 struct adb_driver via_pmu_driver = {
 126         "68K PMU",
 127         pmu_probe,
 128         pmu_init,
 129         pmu_send_request,
 130         pmu_autopoll,
 131         pmu_poll,
 132         pmu_reset_bus
 133 };
 134
 135 /*
 136  * This table indicates for each PMU opcode:
 137  * - the number of data bytes to be sent with the command, or -1
 138  *   if a length byte should be sent,
 139  * - the number of response bytes which the PMU will return, or
 140  *   -1 if it will send a length byte.
 141  */
 142 static s8 pmu_data_len[256][2] = {
 143 /*         0       1       2       3       4       5       6       7  */
 144 /*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 145 /*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 146 /*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 147 /*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
 148 /*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
 149 /*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
 150 /*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 151 /*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
 152 /*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 153 /*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
 154 /*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
 155 /*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
 156 /*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 157 /*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
 158 /*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 159 /*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
 160 /*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 161 /*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 162 /*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 163 /*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 164 /*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
 165 /*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 166 /*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 167 /*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 168 /*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 169 /*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 170 /*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 171 /*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
 172 /*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
 173 /*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
 174 /*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 175 /*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 176 };
 177
 178 int pmu_probe(void)
 179 {
 180         if (macintosh_config->adb_type == MAC_ADB_PB1) {
 181                 pmu_kind = PMU_68K_V1;
 182         } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 183                 pmu_kind = PMU_68K_V2;
 184         } else {
 185                 return -ENODEV;
 186         }
 187
 188         pmu_state = idle;
 189
 190         return 0;
 191 }
 192
 193 static int
 194 pmu_init(void)
 195 {
 196         int timeout;
 197         volatile struct adb_request req;
 198
 199         via2[B] |= TREQ;                                /* negate TREQ */
 200         via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
 201
 202         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
 203         timeout =  100000;
 204         while (!req.complete) {
 205                 if (--timeout < 0) {
 206                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 207                         return -EAGAIN;
 208                 }
 209                 udelay(10);
 210                 pmu_poll();
 211         }
 212
 213         /* ack all pending interrupts */
 214         timeout = 100000;
 215         interrupt_data[0] = 1;
 216         while (interrupt_data[0] || pmu_state != idle) {
 217                 if (--timeout < 0) {
 218                         printk(KERN_ERR "pmu_init: timed out acking intrs\n");
 219                         return -EAGAIN;
 220                 }
 221                 if (pmu_state == idle) {
 222                         adb_int_pending = 1;
 223                         pmu_interrupt(0, NULL);
 224                 }
 225                 pmu_poll();
 226                 udelay(10);
 227         }
 228
 229         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
 230                         PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
 231         timeout =  100000;
 232         while (!req.complete) {
 233                 if (--timeout < 0) {
 234                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 235                         return -EAGAIN;
 236                 }
 237                 udelay(10);
 238                 pmu_poll();
 239         }
 240
 241         bright_req_1.complete = 1;
 242         bright_req_2.complete = 1;
 243         bright_req_3.complete = 1;
 244
 245         if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
 246                         pmu_interrupt)) {
 247                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
 248                         IRQ_MAC_ADB_SR);
 249                 return -EAGAIN;
 250         }
 251         if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
 252                         pmu_interrupt)) {
 253                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
 254                         IRQ_MAC_ADB_CL);
 255                 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
 256                 return -EAGAIN;
 257         }
 258
 259         pmu_fully_inited = 1;
 260
 261         /* Enable backlight */
 262         pmu_enable_backlight(1);
 263
 264         printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
 265
 266         return 0;
 267 }
 268
 269 int
 270 pmu_get_model(void)
 271 {
 272         return pmu_kind;
 273 }
 274
 275 /* Send an ADB command */
 276 static int
 277 pmu_send_request(struct adb_request *req, int sync)
 278 {
 279     int i, ret;
 280
 281     if (!pmu_fully_inited)
 282     {
 283         req->complete = 1;
 284         return -ENXIO;
 285    }
 286
 287     ret = -EINVAL;
 288
 289     switch (req->data[0]) {
 290     case PMU_PACKET:
 291                 for (i = 0; i < req->nbytes - 1; ++i)
 292                         req->data[i] = req->data[i+1];
 293                 --req->nbytes;
 294                 if (pmu_data_len[req->data[0]][1] != 0) {
 295                         req->reply[0] = ADB_RET_OK;
 296                         req->reply_len = 1;
 297                 } else
 298                         req->reply_len = 0;
 299                 ret = pmu_queue_request(req);
 300                 break;
 301     case CUDA_PACKET:
 302                 switch (req->data[1]) {
 303                 case CUDA_GET_TIME:
 304                         if (req->nbytes != 2)
 305                                 break;
 306                         req->data[0] = PMU_READ_RTC;
 307                         req->nbytes = 1;
 308                         req->reply_len = 3;
 309                         req->reply[0] = CUDA_PACKET;
 310                         req->reply[1] = 0;
 311                         req->reply[2] = CUDA_GET_TIME;
 312                         ret = pmu_queue_request(req);
 313                         break;
 314                 case CUDA_SET_TIME:
 315                         if (req->nbytes != 6)
 316                                 break;
 317                         req->data[0] = PMU_SET_RTC;
 318                         req->nbytes = 5;
 319                         for (i = 1; i <= 4; ++i)
 320                                 req->data[i] = req->data[i+1];
 321                         req->reply_len = 3;
 322                         req->reply[0] = CUDA_PACKET;
 323                         req->reply[1] = 0;
 324                         req->reply[2] = CUDA_SET_TIME;
 325                         ret = pmu_queue_request(req);
 326                         break;
 327                 case CUDA_GET_PRAM:
 328                         if (req->nbytes != 4)
 329                                 break;
 330                         req->data[0] = PMU_READ_NVRAM;
 331                         req->data[1] = req->data[2];
 332                         req->data[2] = req->data[3];
 333                         req->nbytes = 3;
 334                         req->reply_len = 3;
 335                         req->reply[0] = CUDA_PACKET;
 336                         req->reply[1] = 0;
 337                         req->reply[2] = CUDA_GET_PRAM;
 338                         ret = pmu_queue_request(req);
 339                         break;
 340                 case CUDA_SET_PRAM:
 341                         if (req->nbytes != 5)
 342                                 break;
 343                         req->data[0] = PMU_WRITE_NVRAM;
 344                         req->data[1] = req->data[2];
 345                         req->data[2] = req->data[3];
 346                         req->data[3] = req->data[4];
 347                         req->nbytes = 4;
 348                         req->reply_len = 3;
 349                         req->reply[0] = CUDA_PACKET;
 350                         req->reply[1] = 0;
 351                         req->reply[2] = CUDA_SET_PRAM;
 352                         ret = pmu_queue_request(req);
 353                         break;
 354                 }
 355                 break;
 356     case ADB_PACKET:
 357                 for (i = req->nbytes - 1; i > 1; --i)
 358                         req->data[i+2] = req->data[i];
 359                 req->data[3] = req->nbytes - 2;
 360                 req->data[2] = pmu_adb_flags;
 361                 /*req->data[1] = req->data[1];*/
 362                 req->data[0] = PMU_ADB_CMD;
 363                 req->nbytes += 2;
 364                 req->reply_expected = 1;
 365                 req->reply_len = 0;
 366                 ret = pmu_queue_request(req);
 367                 break;
 368     }
 369     if (ret)
 370     {
 371         req->complete = 1;
 372         return ret;
 373     }
 374
 375     if (sync) {
 376         while (!req->complete)
 377                 pmu_poll();
 378     }
 379
 380     return 0;
 381 }
 382
 383 /* Enable/disable autopolling */
 384 static int
 385 pmu_autopoll(int devs)
 386 {
 387         struct adb_request req;
 388
 389         if (!pmu_fully_inited) return -ENXIO;
 390
 391         if (devs) {
 392                 adb_dev_map = devs;
 393                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
 394                             adb_dev_map >> 8, adb_dev_map);
 395                 pmu_adb_flags = 2;
 396         } else {
 397                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
 398                 pmu_adb_flags = 0;
 399         }
 400         while (!req.complete)
 401                 pmu_poll();
 402         return 0;
 403 }
 404
 405 /* Reset the ADB bus */
 406 static int
 407 pmu_reset_bus(void)
 408 {
 409         struct adb_request req;
 410         long timeout;
 411         int save_autopoll = adb_dev_map;
 412
 413         if (!pmu_fully_inited) return -ENXIO;
 414
 415         /* anyone got a better idea?? */
 416         pmu_autopoll(0);
 417
 418         req.nbytes = 5;
 419         req.done = NULL;
 420         req.data[0] = PMU_ADB_CMD;
 421         req.data[1] = 0;
 422         req.data[2] = 3; /* ADB_BUSRESET ??? */
 423         req.data[3] = 0;
 424         req.data[4] = 0;
 425         req.reply_len = 0;
 426         req.reply_expected = 1;
 427         if (pmu_queue_request(&req) != 0)
 428         {
 429                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
 430                 return -EIO;
 431         }
 432         while (!req.complete)
 433                 pmu_poll();
 434         timeout = 100000;
 435         while (!req.complete) {
 436                 if (--timeout < 0) {
 437                         printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
 438                         return -EIO;
 439                 }
 440                 udelay(10);
 441                 pmu_poll();
 442         }
 443
 444         if (save_autopoll != 0)
 445                 pmu_autopoll(save_autopoll);
 446
 447         return 0;
 448 }
 449
 450 /* Construct and send a pmu request */
 451 int
 452 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
 453             int nbytes, ...)
 454 {
 455         va_list list;
 456         int i;
 457
 458         if (nbytes < 0 || nbytes > 32) {
 459                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
 460                 req->complete = 1;
 461                 return -EINVAL;
 462         }
 463         req->nbytes = nbytes;
 464         req->done = done;
 465         va_start(list, nbytes);
 466         for (i = 0; i < nbytes; ++i)
 467                 req->data[i] = va_arg(list, int);
 468         va_end(list);
 469         if (pmu_data_len[req->data[0]][1] != 0) {
 470                 req->reply[0] = ADB_RET_OK;
 471                 req->reply_len = 1;
 472         } else
 473                 req->reply_len = 0;
 474         req->reply_expected = 0;
 475         return pmu_queue_request(req);
 476 }
 477
 478 static int
 479 pmu_queue_request(struct adb_request *req)
 480 {
 481         unsigned long flags;
 482         int nsend;
 483
 484         if (req->nbytes <= 0) {
 485                 req->complete = 1;
 486                 return 0;
 487         }
 488         nsend = pmu_data_len[req->data[0]][0];
 489         if (nsend >= 0 && req->nbytes != nsend + 1) {
 490                 req->complete = 1;
 491                 return -EINVAL;
 492         }
 493
 494         req->next = NULL;
 495         req->sent = 0;
 496         req->complete = 0;
 497         local_irq_save(flags);
 498
 499         if (current_req != 0) {
 500                 last_req->next = req;
 501                 last_req = req;
 502         } else {
 503                 current_req = req;
 504                 last_req = req;
 505                 if (pmu_state == idle)
 506                         pmu_start();
 507         }
 508
 509         local_irq_restore(flags);
 510         return 0;
 511 }
 512
 513 static void
 514 send_byte(int x)
 515 {
 516         via1[ACR] |= SR_CTRL;
 517         via1[SR] = x;
 518         via2[B] &= ~TREQ;               /* assert TREQ */
 519 }
 520
 521 static void
 522 recv_byte(void)
 523 {
 524         char c;
 525
 526         via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
 527         c = via1[SR];           /* resets SR */
 528         via2[B] &= ~TREQ;
 529 }
 530
 531 static void
 532 pmu_start(void)
 533 {
 534         unsigned long flags;
 535         struct adb_request *req;
 536
 537         /* assert pmu_state == idle */
 538         /* get the packet to send */
 539         local_irq_save(flags);
 540         req = current_req;
 541         if (req == 0 || pmu_state != idle
 542             || (req->reply_expected && req_awaiting_reply))
 543                 goto out;
 544
 545         pmu_state = sending;
 546         data_index = 1;
 547         data_len = pmu_data_len[req->data[0]][0];
 548
 549         /* set the shift register to shift out and send a byte */
 550         send_byte(req->data[0]);
 551
 552 out:
 553         local_irq_restore(flags);
 554 }
 555
 556 void
 557 pmu_poll(void)
 558 {
 559         unsigned long flags;
 560
 561         local_irq_save(flags);
 562         if (via1[IFR] & SR_INT) {
 563                 via1[IFR] = SR_INT;
 564                 pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
 565         }
 566         if (via1[IFR] & CB1_INT) {
 567                 via1[IFR] = CB1_INT;
 568                 pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
 569         }
 570         local_irq_restore(flags);
 571 }
 572
 573 static irqreturn_t
 574 pmu_interrupt(int irq, void *dev_id)
 575 {
 576         struct adb_request *req;
 577         int timeout, bite = 0;  /* to prevent compiler warning */
 578
 579 #if 0
 580         printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 581                 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 582 #endif
 583
 584         if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
 585                 adb_int_pending = 1;
 586         } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
 587                 if (via2[B] & TACK) {
 588                         printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
 589                 }
 590
 591                 /* if reading grab the byte */
 592                 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
 593
 594                 /* reset TREQ and wait for TACK to go high */
 595                 via2[B] |= TREQ;
 596                 timeout = 3200;
 597                 while (!(via2[B] & TACK)) {
 598                         if (--timeout < 0) {
 599                                 printk(KERN_ERR "PMU not responding (!ack)\n");
 600                                 goto finish;
 601                         }
 602                         udelay(10);
 603                 }
 604
 605                 switch (pmu_state) {
 606                 case sending:
 607                         req = current_req;
 608                         if (data_len < 0) {
 609                                 data_len = req->nbytes - 1;
 610                                 send_byte(data_len);
 611                                 break;
 612                         }
 613                         if (data_index <= data_len) {
 614                                 send_byte(req->data[data_index++]);
 615                                 break;
 616                         }
 617                         req->sent = 1;
 618                         data_len = pmu_data_len[req->data[0]][1];
 619                         if (data_len == 0) {
 620                                 pmu_state = idle;
 621                                 current_req = req->next;
 622                                 if (req->reply_expected)
 623                                         req_awaiting_reply = req;
 624                                 else
 625                                         pmu_done(req);
 626                         } else {
 627                                 pmu_state = reading;
 628                                 data_index = 0;
 629                                 reply_ptr = req->reply + req->reply_len;
 630                                 recv_byte();
 631                         }
 632                         break;
 633
 634                 case intack:
 635                         data_index = 0;
 636                         data_len = -1;
 637                         pmu_state = reading_intr;
 638                         reply_ptr = interrupt_data;
 639                         recv_byte();
 640                         break;
 641
 642                 case reading:
 643                 case reading_intr:
 644                         if (data_len == -1) {
 645                                 data_len = bite;
 646                                 if (bite > 32)
 647                                         printk(KERN_ERR "PMU: bad reply len %d\n",
 648                                                bite);
 649                         } else {
 650                                 reply_ptr[data_index++] = bite;
 651                         }
 652                         if (data_index < data_len) {
 653                                 recv_byte();
 654                                 break;
 655                         }
 656
 657                         if (pmu_state == reading_intr) {
 658                                 pmu_handle_data(interrupt_data, data_index);
 659                         } else {
 660                                 req = current_req;
 661                                 current_req = req->next;
 662                                 req->reply_len += data_index;
 663                                 pmu_done(req);
 664                         }
 665                         pmu_state = idle;
 666
 667                         break;
 668
 669                 default:
 670                         printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
 671                                pmu_state);
 672                 }
 673         }
 674 finish:
 675         if (pmu_state == idle) {
 676                 if (adb_int_pending) {
 677                         pmu_state = intack;
 678                         send_byte(PMU_INT_ACK);
 679                         adb_int_pending = 0;
 680                 } else if (current_req) {
 681                         pmu_start();
 682                 }
 683         }
 684
 685 #if 0
 686         printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 687                 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 688 #endif
 689         return IRQ_HANDLED;
 690 }
 691
 692 static void
 693 pmu_done(struct adb_request *req)
 694 {
 695         req->complete = 1;
 696         if (req->done)
 697                 (*req->done)(req);
 698 }
 699
 700 /* Interrupt data could be the result data from an ADB cmd */
 701 static void
 702 pmu_handle_data(unsigned char *data, int len)
 703 {
 704         static int show_pmu_ints = 1;
 705
 706         asleep = 0;
 707         if (len < 1) {
 708                 adb_int_pending = 0;
 709                 return;
 710         }
 711         if (data[0] & PMU_INT_ADB) {
 712                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
 713                         struct adb_request *req = req_awaiting_reply;
 714                         if (req == 0) {
 715                                 printk(KERN_ERR "PMU: extra ADB reply\n");
 716                                 return;
 717                         }
 718                         req_awaiting_reply = NULL;
 719                         if (len <= 2)
 720                                 req->reply_len = 0;
 721                         else {
 722                                 memcpy(req->reply, data + 1, len - 1);
 723                                 req->reply_len = len - 1;
 724                         }
 725                         pmu_done(req);
 726                 } else {
 727                         adb_input(data+1, len-1, 1);
 728                 }
 729         } else {
 730                 if (data[0] == 0x08 && len == 3) {
 731                         /* sound/brightness buttons pressed */
 732                         pmu_set_brightness(data[1] >> 3);
 733                         set_volume(data[2]);
 734                 } else if (show_pmu_ints
 735                            && !(data[0] == PMU_INT_TICK && len == 1)) {
 736                         int i;
 737                         printk(KERN_DEBUG "pmu intr");
 738                         for (i = 0; i < len; ++i)
 739                                 printk(" %.2x", data[i]);
 740                         printk("\n");
 741                 }
 742         }
 743 }
 744
 745 int backlight_level = -1;
 746 int backlight_enabled = 0;
 747
 748 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
 749
 750 static void
 751 pmu_enable_backlight(int on)
 752 {
 753         struct adb_request req;
 754
 755         if (on) {
 756             /* first call: get current backlight value */
 757             if (backlight_level < 0) {
 758                 switch(pmu_kind) {
 759                     case PMU_68K_V1:
 760                     case PMU_68K_V2:
 761                         pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
 762                         while (!req.complete)
 763                                 pmu_poll();
 764                         printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
 765                         backlight_level = req.reply[1];
 766                         break;
 767                     default:
 768                         backlight_enabled = 0;
 769                         return;
 770                 }
 771             }
 772             pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 773                 LEVEL_TO_BRIGHT(backlight_level));
 774             while (!req.complete)
 775                 pmu_poll();
 776         }
 777         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
 778             PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
 779         while (!req.complete)
 780                 pmu_poll();
 781         backlight_enabled = on;
 782 }
 783
 784 static void
 785 pmu_set_brightness(int level)
 786 {
 787         int bright;
 788
 789         backlight_level = level;
 790         bright = LEVEL_TO_BRIGHT(level);
 791         if (!backlight_enabled)
 792                 return;
 793         if (bright_req_1.complete)
 794                 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 795                     bright);
 796         if (bright_req_2.complete)
 797                 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
 798                     PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
 799 }
 800
 801 void
 802 pmu_enable_irled(int on)
 803 {
 804         struct adb_request req;
 805
 806         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
 807             (on ? PMU_POW_ON : PMU_POW_OFF));
 808         while (!req.complete)
 809                 pmu_poll();
 810 }
 811
 812 static void
 813 set_volume(int level)
 814 {
 815 }
 816
 817 int
 818 pmu_present(void)
 819 {
 820         return (pmu_kind != PMU_UNKNOWN);
 821 }
 822
 823 #if 0 /* needs some work for 68K */
 824
 825 /*
 826  * This struct is used to store config register values for
 827  * PCI devices which may get powered off when we sleep.
 828  */
 829 static struct pci_save {
 830         u16     command;
 831         u16     cache_lat;
 832         u16     intr;
 833 } *pbook_pci_saves;
 834 static int n_pbook_pci_saves;
 835
 836 static inline void
 837 pbook_pci_save(void)
 838 {
 839         int npci;
 840         struct pci_dev *pd = NULL;
 841         struct pci_save *ps;
 842
 843         npci = 0;
 844         while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL)
 845                 ++npci;
 846         n_pbook_pci_saves = npci;
 847         if (npci == 0)
 848                 return;
 849         ps = kmalloc(npci * sizeof(*ps), GFP_KERNEL);
 850         pbook_pci_saves = ps;
 851         if (ps == NULL)
 852                 return;
 853
 854         pd = NULL;
 855         while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
 856                 pci_read_config_word(pd, PCI_COMMAND, &ps->command);
 857                 pci_read_config_word(pd, PCI_CACHE_LINE_SIZE, &ps->cache_lat);
 858                 pci_read_config_word(pd, PCI_INTERRUPT_LINE, &ps->intr);
 859                 ++ps;
 860                 --npci;
 861         }
 862 }
 863
 864 static inline void
 865 pbook_pci_restore(void)
 866 {
 867         u16 cmd;
 868         struct pci_save *ps = pbook_pci_saves;
 869         struct pci_dev *pd = NULL;
 870         int j;
 871
 872         while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
 873                 if (ps->command == 0)
 874                         continue;
 875                 pci_read_config_word(pd, PCI_COMMAND, &cmd);
 876                 if ((ps->command & ~cmd) == 0)
 877                         continue;
 878                 switch (pd->hdr_type) {
 879                 case PCI_HEADER_TYPE_NORMAL:
 880                         for (j = 0; j < 6; ++j)
 881                                 pci_write_config_dword(pd,
 882                                         PCI_BASE_ADDRESS_0 + j*4,
 883                                         pd->resource[j].start);
 884                         pci_write_config_dword(pd, PCI_ROM_ADDRESS,
 885                                pd->resource[PCI_ROM_RESOURCE].start);
 886                         pci_write_config_word(pd, PCI_CACHE_LINE_SIZE,
 887                                 ps->cache_lat);
 888                         pci_write_config_word(pd, PCI_INTERRUPT_LINE,
 889                                 ps->intr);
 890                         pci_write_config_word(pd, PCI_COMMAND, ps->command);
 891                         break;
 892                         /* other header types not restored at present */
 893                 }
 894         }
 895 }
 896
 897 /*
 898  * Put the powerbook to sleep.
 899  */
 900 #define IRQ_ENABLE      ((unsigned int *)0xf3000024)
 901 #define MEM_CTRL        ((unsigned int *)0xf8000070)
 902
 903 int powerbook_sleep(void)
 904 {
 905         int ret, i, x;
 906         static int save_backlight;
 907         static unsigned int save_irqen;
 908         unsigned long msr;
 909         unsigned int hid0;
 910         unsigned long p, wait;
 911         struct adb_request sleep_req;
 912
 913         /* Notify device drivers */
 914         ret = blocking_notifier_call_chain(&sleep_notifier_list,
 915                         PBOOK_SLEEP, NULL);
 916         if (ret & NOTIFY_STOP_MASK)
 917                 return -EBUSY;
 918
 919         /* Sync the disks. */
 920         /* XXX It would be nice to have some way to ensure that
 921          * nobody is dirtying any new buffers while we wait. */
 922         sys_sync();
 923
 924         /* Turn off the display backlight */
 925         save_backlight = backlight_enabled;
 926         if (save_backlight)
 927                 pmu_enable_backlight(0);
 928
 929         /* Give the disks a little time to actually finish writing */
 930         for (wait = jiffies + (HZ/4); time_before(jiffies, wait); )
 931                 mb();
 932
 933         /* Disable all interrupts except pmu */
 934         save_irqen = in_le32(IRQ_ENABLE);
 935         for (i = 0; i < 32; ++i)
 936                 if (i != vias->intrs[0].line && (save_irqen & (1 << i)))
 937                         disable_irq(i);
 938         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 939
 940         /* Save the state of PCI config space for some slots */
 941         pbook_pci_save();
 942
 943         /* Set the memory controller to keep the memory refreshed
 944            while we're asleep */
 945         for (i = 0x403f; i >= 0x4000; --i) {
 946                 out_be32(MEM_CTRL, i);
 947                 do {
 948                         x = (in_be32(MEM_CTRL) >> 16) & 0x3ff;
 949                 } while (x == 0);
 950                 if (x >= 0x100)
 951                         break;
 952         }
 953
 954         /* Ask the PMU to put us to sleep */
 955         pmu_request(&sleep_req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
 956         while (!sleep_req.complete)
 957                 mb();
 958         /* displacement-flush the L2 cache - necessary? */
 959         for (p = KERNELBASE; p < KERNELBASE + 0x100000; p += 0x1000)
 960                 i = *(volatile int *)p;
 961         asleep = 1;
 962
 963         /* Put the CPU into sleep mode */
 964         asm volatile("mfspr %0,1008" : "=r" (hid0) :);
 965         hid0 = (hid0 & ~(HID0_NAP | HID0_DOZE)) | HID0_SLEEP;
 966         asm volatile("mtspr 1008,%0" : : "r" (hid0));
 967         local_save_flags(msr);
 968         msr |= MSR_POW | MSR_EE;
 969         local_irq_restore(msr);
 970         udelay(10);
 971
 972         /* OK, we're awake again, start restoring things */
 973         out_be32(MEM_CTRL, 0x3f);
 974         pbook_pci_restore();
 975
 976         /* wait for the PMU interrupt sequence to complete */
 977         while (asleep)
 978                 mb();
 979
 980         /* reenable interrupts */
 981         for (i = 0; i < 32; ++i)
 982                 if (i != vias->intrs[0].line && (save_irqen & (1 << i)))
 983                         enable_irq(i);
 984
 985         /* Notify drivers */
 986         blocking_notifier_call_chain(&sleep_notifier_list, PBOOK_WAKE, NULL);
 987
 988         /* reenable ADB autopoll */
 989         pmu_adb_autopoll(adb_dev_map);
 990
 991         /* Turn on the screen backlight, if it was on before */
 992         if (save_backlight)
 993                 pmu_enable_backlight(1);
 994
 995         /* Wait for the hard disk to spin up */
 996
 997         return 0;
 998 }
 999
1000 /*
1001  * Support for /dev/pmu device
1002  */
1003 static int pmu_open(struct inode *inode, struct file *file)
1004 {
1005         return 0;
1006 }
1007
1008 static ssize_t pmu_read(struct file *file, char *buf,
1009                         size_t count, loff_t *ppos)
1010 {
1011         return 0;
1012 }
1013
1014 static ssize_t pmu_write(struct file *file, const char *buf,
1015                          size_t count, loff_t *ppos)
1016 {
1017         return 0;
1018 }
1019
1020 static int pmu_ioctl(struct inode * inode, struct file *filp,
1021                      u_int cmd, u_long arg)
1022 {
1023         int error;
1024         __u32 value;
1025
1026         switch (cmd) {
1027             case PMU_IOC_SLEEP:
1028                 return -ENOSYS;
1029             case PMU_IOC_GET_BACKLIGHT:
1030                 return put_user(backlight_level, (__u32 *)arg);
1031             case PMU_IOC_SET_BACKLIGHT:
1032                 error = get_user(value, (__u32 *)arg);
1033                 if (!error)
1034                         pmu_set_brightness(value);
1035                 return error;
1036             case PMU_IOC_GET_MODEL:
1037                 return put_user(pmu_kind, (__u32 *)arg);
1038         }
1039         return -EINVAL;
1040 }
1041
1042 static const struct file_operations pmu_device_fops = {
1043         .read           = pmu_read,
1044         .write          = pmu_write,
1045         .ioctl          = pmu_ioctl,
1046         .open           = pmu_open,
1047 };
1048
1049 static struct miscdevice pmu_device = {
1050         PMU_MINOR, "pmu", &pmu_device_fops
1051 };
1052
1053 void pmu_device_init(void)
1054 {
1055         if (!via)
1056                 return;
1057         if (misc_register(&pmu_device) < 0)
1058                 printk(KERN_ERR "via-pmu68k: cannot register misc device.\n");
1059 }
1060 #endif /* CONFIG_PMAC_PBOOK */
1061