git.oblomov.eu Git - linux-2.6/blob - 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/sched.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/pci.h>
  29 #include <linux/slab.h>
  30 #include <linux/init.h>
  31 #include <linux/interrupt.h>
  32
  33 #include <linux/adb.h>
  34 #include <linux/pmu.h>
  35 #include <linux/cuda.h>
  36
  37 #include <asm/macintosh.h>
  38 #include <asm/macints.h>
  39 #include <asm/machw.h>
  40 #include <asm/mac_via.h>
  41
  42 #include <asm/pgtable.h>
  43 #include <asm/system.h>
  44 #include <asm/irq.h>
  45 #include <asm/uaccess.h>
  46
  47 /* Misc minor number allocated for /dev/pmu */
  48 #define PMU_MINOR       154
  49
  50 /* VIA registers - spaced 0x200 bytes apart */
  51 #define RS              0x200           /* skip between registers */
  52 #define B               0               /* B-side data */
  53 #define A               RS              /* A-side data */
  54 #define DIRB            (2*RS)          /* B-side direction (1=output) */
  55 #define DIRA            (3*RS)          /* A-side direction (1=output) */
  56 #define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
  57 #define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
  58 #define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
  59 #define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
  60 #define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
  61 #define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
  62 #define SR              (10*RS)         /* Shift register */
  63 #define ACR             (11*RS)         /* Auxiliary control register */
  64 #define PCR             (12*RS)         /* Peripheral control register */
  65 #define IFR             (13*RS)         /* Interrupt flag register */
  66 #define IER             (14*RS)         /* Interrupt enable register */
  67 #define ANH             (15*RS)         /* A-side data, no handshake */
  68
  69 /* Bits in B data register: both active low */
  70 #define TACK            0x02            /* Transfer acknowledge (input) */
  71 #define TREQ            0x04            /* Transfer request (output) */
  72
  73 /* Bits in ACR */
  74 #define SR_CTRL         0x1c            /* Shift register control bits */
  75 #define SR_EXT          0x0c            /* Shift on external clock */
  76 #define SR_OUT          0x10            /* Shift out if 1 */
  77
  78 /* Bits in IFR and IER */
  79 #define SR_INT          0x04            /* Shift register full/empty */
  80 #define CB1_INT         0x10            /* transition on CB1 input */
  81
  82 static enum pmu_state {
  83         idle,
  84         sending,
  85         intack,
  86         reading,
  87         reading_intr,
  88 } pmu_state;
  89
  90 static struct adb_request *current_req;
  91 static struct adb_request *last_req;
  92 static struct adb_request *req_awaiting_reply;
  93 static unsigned char interrupt_data[32];
  94 static unsigned char *reply_ptr;
  95 static int data_index;
  96 static int data_len;
  97 static int adb_int_pending;
  98 static int pmu_adb_flags;
  99 static int adb_dev_map = 0;
 100 static struct adb_request bright_req_1, bright_req_2, bright_req_3;
 101 static int pmu_kind = PMU_UNKNOWN;
 102 static int pmu_fully_inited = 0;
 103
 104 int asleep;
 105 BLOCKING_NOTIFIER_HEAD(sleep_notifier_list);
 106
 107 static int pmu_probe(void);
 108 static int pmu_init(void);
 109 static void pmu_start(void);
 110 static irqreturn_t pmu_interrupt(int irq, void *arg);
 111 static int pmu_send_request(struct adb_request *req, int sync);
 112 static int pmu_autopoll(int devs);
 113 void pmu_poll(void);
 114 static int pmu_reset_bus(void);
 115 static int pmu_queue_request(struct adb_request *req);
 116
 117 static void pmu_start(void);
 118 static void send_byte(int x);
 119 static void recv_byte(void);
 120 static void pmu_done(struct adb_request *req);
 121 static void pmu_handle_data(unsigned char *data, int len);
 122 static void set_volume(int level);
 123 static void pmu_enable_backlight(int on);
 124 static void pmu_set_brightness(int level);
 125
 126 struct adb_driver via_pmu_driver = {
 127         "68K PMU",
 128         pmu_probe,
 129         pmu_init,
 130         pmu_send_request,
 131         pmu_autopoll,
 132         pmu_poll,
 133         pmu_reset_bus
 134 };
 135
 136 /*
 137  * This table indicates for each PMU opcode:
 138  * - the number of data bytes to be sent with the command, or -1
 139  *   if a length byte should be sent,
 140  * - the number of response bytes which the PMU will return, or
 141  *   -1 if it will send a length byte.
 142  */
 143 static s8 pmu_data_len[256][2] = {
 144 /*         0       1       2       3       4       5       6       7  */
 145 /*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 146 /*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 147 /*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 148 /*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
 149 /*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
 150 /*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
 151 /*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 152 /*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
 153 /*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 154 /*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
 155 /*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
 156 /*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
 157 /*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 158 /*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
 159 /*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 160 /*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
 161 /*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 162 /*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 163 /*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 164 /*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 165 /*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
 166 /*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 167 /*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 168 /*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 169 /*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 170 /*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 171 /*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 172 /*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
 173 /*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
 174 /*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
 175 /*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 176 /*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 177 };
 178
 179 int pmu_probe(void)
 180 {
 181         if (macintosh_config->adb_type == MAC_ADB_PB1) {
 182                 pmu_kind = PMU_68K_V1;
 183         } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 184                 pmu_kind = PMU_68K_V2;
 185         } else {
 186                 return -ENODEV;
 187         }
 188
 189         pmu_state = idle;
 190
 191         return 0;
 192 }
 193
 194 static int
 195 pmu_init(void)
 196 {
 197         int timeout;
 198         volatile struct adb_request req;
 199
 200         via2[B] |= TREQ;                                /* negate TREQ */
 201         via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
 202
 203         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
 204         timeout =  100000;
 205         while (!req.complete) {
 206                 if (--timeout < 0) {
 207                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 208                         return -EAGAIN;
 209                 }
 210                 udelay(10);
 211                 pmu_poll();
 212         }
 213
 214         /* ack all pending interrupts */
 215         timeout = 100000;
 216         interrupt_data[0] = 1;
 217         while (interrupt_data[0] || pmu_state != idle) {
 218                 if (--timeout < 0) {
 219                         printk(KERN_ERR "pmu_init: timed out acking intrs\n");
 220                         return -EAGAIN;
 221                 }
 222                 if (pmu_state == idle) {
 223                         adb_int_pending = 1;
 224                         pmu_interrupt(0, NULL);
 225                 }
 226                 pmu_poll();
 227                 udelay(10);
 228         }
 229
 230         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
 231                         PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
 232         timeout =  100000;
 233         while (!req.complete) {
 234                 if (--timeout < 0) {
 235                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 236                         return -EAGAIN;
 237                 }
 238                 udelay(10);
 239                 pmu_poll();
 240         }
 241
 242         bright_req_1.complete = 1;
 243         bright_req_2.complete = 1;
 244         bright_req_3.complete = 1;
 245
 246         if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
 247                         pmu_interrupt)) {
 248                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
 249                         IRQ_MAC_ADB_SR);
 250                 return -EAGAIN;
 251         }
 252         if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
 253                         pmu_interrupt)) {
 254                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
 255                         IRQ_MAC_ADB_CL);
 256                 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
 257                 return -EAGAIN;
 258         }
 259
 260         pmu_fully_inited = 1;
 261
 262         /* Enable backlight */
 263         pmu_enable_backlight(1);
 264
 265         printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
 266
 267         return 0;
 268 }
 269
 270 int
 271 pmu_get_model(void)
 272 {
 273         return pmu_kind;
 274 }
 275
 276 /* Send an ADB command */
 277 static int
 278 pmu_send_request(struct adb_request *req, int sync)
 279 {
 280     int i, ret;
 281
 282     if (!pmu_fully_inited)
 283     {
 284         req->complete = 1;
 285         return -ENXIO;
 286    }
 287
 288     ret = -EINVAL;
 289
 290     switch (req->data[0]) {
 291     case PMU_PACKET:
 292                 for (i = 0; i < req->nbytes - 1; ++i)
 293                         req->data[i] = req->data[i+1];
 294                 --req->nbytes;
 295                 if (pmu_data_len[req->data[0]][1] != 0) {
 296                         req->reply[0] = ADB_RET_OK;
 297                         req->reply_len = 1;
 298                 } else
 299                         req->reply_len = 0;
 300                 ret = pmu_queue_request(req);
 301                 break;
 302     case CUDA_PACKET:
 303                 switch (req->data[1]) {
 304                 case CUDA_GET_TIME:
 305                         if (req->nbytes != 2)
 306                                 break;
 307                         req->data[0] = PMU_READ_RTC;
 308                         req->nbytes = 1;
 309                         req->reply_len = 3;
 310                         req->reply[0] = CUDA_PACKET;
 311                         req->reply[1] = 0;
 312                         req->reply[2] = CUDA_GET_TIME;
 313                         ret = pmu_queue_request(req);
 314                         break;
 315                 case CUDA_SET_TIME:
 316                         if (req->nbytes != 6)
 317                                 break;
 318                         req->data[0] = PMU_SET_RTC;
 319                         req->nbytes = 5;
 320                         for (i = 1; i <= 4; ++i)
 321                                 req->data[i] = req->data[i+1];
 322                         req->reply_len = 3;
 323                         req->reply[0] = CUDA_PACKET;
 324                         req->reply[1] = 0;
 325                         req->reply[2] = CUDA_SET_TIME;
 326                         ret = pmu_queue_request(req);
 327                         break;
 328                 case CUDA_GET_PRAM:
 329                         if (req->nbytes != 4)
 330                                 break;
 331                         req->data[0] = PMU_READ_NVRAM;
 332                         req->data[1] = req->data[2];
 333                         req->data[2] = req->data[3];
 334                         req->nbytes = 3;
 335                         req->reply_len = 3;
 336                         req->reply[0] = CUDA_PACKET;
 337                         req->reply[1] = 0;
 338                         req->reply[2] = CUDA_GET_PRAM;
 339                         ret = pmu_queue_request(req);
 340                         break;
 341                 case CUDA_SET_PRAM:
 342                         if (req->nbytes != 5)
 343                                 break;
 344                         req->data[0] = PMU_WRITE_NVRAM;
 345                         req->data[1] = req->data[2];
 346                         req->data[2] = req->data[3];
 347                         req->data[3] = req->data[4];
 348                         req->nbytes = 4;
 349                         req->reply_len = 3;
 350                         req->reply[0] = CUDA_PACKET;
 351                         req->reply[1] = 0;
 352                         req->reply[2] = CUDA_SET_PRAM;
 353                         ret = pmu_queue_request(req);
 354                         break;
 355                 }
 356                 break;
 357     case ADB_PACKET:
 358                 for (i = req->nbytes - 1; i > 1; --i)
 359                         req->data[i+2] = req->data[i];
 360                 req->data[3] = req->nbytes - 2;
 361                 req->data[2] = pmu_adb_flags;
 362                 /*req->data[1] = req->data[1];*/
 363                 req->data[0] = PMU_ADB_CMD;
 364                 req->nbytes += 2;
 365                 req->reply_expected = 1;
 366                 req->reply_len = 0;
 367                 ret = pmu_queue_request(req);
 368                 break;
 369     }
 370     if (ret)
 371     {
 372         req->complete = 1;
 373         return ret;
 374     }
 375
 376     if (sync) {
 377         while (!req->complete)
 378                 pmu_poll();
 379     }
 380
 381     return 0;
 382 }
 383
 384 /* Enable/disable autopolling */
 385 static int
 386 pmu_autopoll(int devs)
 387 {
 388         struct adb_request req;
 389
 390         if (!pmu_fully_inited) return -ENXIO;
 391
 392         if (devs) {
 393                 adb_dev_map = devs;
 394                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
 395                             adb_dev_map >> 8, adb_dev_map);
 396                 pmu_adb_flags = 2;
 397         } else {
 398                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
 399                 pmu_adb_flags = 0;
 400         }
 401         while (!req.complete)
 402                 pmu_poll();
 403         return 0;
 404 }
 405
 406 /* Reset the ADB bus */
 407 static int
 408 pmu_reset_bus(void)
 409 {
 410         struct adb_request req;
 411         long timeout;
 412         int save_autopoll = adb_dev_map;
 413
 414         if (!pmu_fully_inited) return -ENXIO;
 415
 416         /* anyone got a better idea?? */
 417         pmu_autopoll(0);
 418
 419         req.nbytes = 5;
 420         req.done = NULL;
 421         req.data[0] = PMU_ADB_CMD;
 422         req.data[1] = 0;
 423         req.data[2] = 3; /* ADB_BUSRESET ??? */
 424         req.data[3] = 0;
 425         req.data[4] = 0;
 426         req.reply_len = 0;
 427         req.reply_expected = 1;
 428         if (pmu_queue_request(&req) != 0)
 429         {
 430                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
 431                 return -EIO;
 432         }
 433         while (!req.complete)
 434                 pmu_poll();
 435         timeout = 100000;
 436         while (!req.complete) {
 437                 if (--timeout < 0) {
 438                         printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
 439                         return -EIO;
 440                 }
 441                 udelay(10);
 442                 pmu_poll();
 443         }
 444
 445         if (save_autopoll != 0)
 446                 pmu_autopoll(save_autopoll);
 447
 448         return 0;
 449 }
 450
 451 /* Construct and send a pmu request */
 452 int
 453 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
 454             int nbytes, ...)
 455 {
 456         va_list list;
 457         int i;
 458
 459         if (nbytes < 0 || nbytes > 32) {
 460                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
 461                 req->complete = 1;
 462                 return -EINVAL;
 463         }
 464         req->nbytes = nbytes;
 465         req->done = done;
 466         va_start(list, nbytes);
 467         for (i = 0; i < nbytes; ++i)
 468                 req->data[i] = va_arg(list, int);
 469         va_end(list);
 470         if (pmu_data_len[req->data[0]][1] != 0) {
 471                 req->reply[0] = ADB_RET_OK;
 472                 req->reply_len = 1;
 473         } else
 474                 req->reply_len = 0;
 475         req->reply_expected = 0;
 476         return pmu_queue_request(req);
 477 }
 478
 479 static int
 480 pmu_queue_request(struct adb_request *req)
 481 {
 482         unsigned long flags;
 483         int nsend;
 484
 485         if (req->nbytes <= 0) {
 486                 req->complete = 1;
 487                 return 0;
 488         }
 489         nsend = pmu_data_len[req->data[0]][0];
 490         if (nsend >= 0 && req->nbytes != nsend + 1) {
 491                 req->complete = 1;
 492                 return -EINVAL;
 493         }
 494
 495         req->next = NULL;
 496         req->sent = 0;
 497         req->complete = 0;
 498         local_irq_save(flags);
 499
 500         if (current_req != 0) {
 501                 last_req->next = req;
 502                 last_req = req;
 503         } else {
 504                 current_req = req;
 505                 last_req = req;
 506                 if (pmu_state == idle)
 507                         pmu_start();
 508         }
 509
 510         local_irq_restore(flags);
 511         return 0;
 512 }
 513
 514 static void
 515 send_byte(int x)
 516 {
 517         via1[ACR] |= SR_CTRL;
 518         via1[SR] = x;
 519         via2[B] &= ~TREQ;               /* assert TREQ */
 520 }
 521
 522 static void
 523 recv_byte(void)
 524 {
 525         char c;
 526
 527         via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
 528         c = via1[SR];           /* resets SR */
 529         via2[B] &= ~TREQ;
 530 }
 531
 532 static void
 533 pmu_start(void)
 534 {
 535         unsigned long flags;
 536         struct adb_request *req;
 537
 538         /* assert pmu_state == idle */
 539         /* get the packet to send */
 540         local_irq_save(flags);
 541         req = current_req;
 542         if (req == 0 || pmu_state != idle
 543             || (req->reply_expected && req_awaiting_reply))
 544                 goto out;
 545
 546         pmu_state = sending;
 547         data_index = 1;
 548         data_len = pmu_data_len[req->data[0]][0];
 549
 550         /* set the shift register to shift out and send a byte */
 551         send_byte(req->data[0]);
 552
 553 out:
 554         local_irq_restore(flags);
 555 }
 556
 557 void
 558 pmu_poll(void)
 559 {
 560         unsigned long flags;
 561
 562         local_irq_save(flags);
 563         if (via1[IFR] & SR_INT) {
 564                 via1[IFR] = SR_INT;
 565                 pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
 566         }
 567         if (via1[IFR] & CB1_INT) {
 568                 via1[IFR] = CB1_INT;
 569                 pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
 570         }
 571         local_irq_restore(flags);
 572 }
 573
 574 static irqreturn_t
 575 pmu_interrupt(int irq, void *dev_id)
 576 {
 577         struct adb_request *req;
 578         int timeout, bite = 0;  /* to prevent compiler warning */
 579
 580 #if 0
 581         printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 582                 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 583 #endif
 584
 585         if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
 586                 adb_int_pending = 1;
 587         } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
 588                 if (via2[B] & TACK) {
 589                         printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
 590                 }
 591
 592                 /* if reading grab the byte */
 593                 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
 594
 595                 /* reset TREQ and wait for TACK to go high */
 596                 via2[B] |= TREQ;
 597                 timeout = 3200;
 598                 while (!(via2[B] & TACK)) {
 599                         if (--timeout < 0) {
 600                                 printk(KERN_ERR "PMU not responding (!ack)\n");
 601                                 goto finish;
 602                         }
 603                         udelay(10);
 604                 }
 605
 606                 switch (pmu_state) {
 607                 case sending:
 608                         req = current_req;
 609                         if (data_len < 0) {
 610                                 data_len = req->nbytes - 1;
 611                                 send_byte(data_len);
 612                                 break;
 613                         }
 614                         if (data_index <= data_len) {
 615                                 send_byte(req->data[data_index++]);
 616                                 break;
 617                         }
 618                         req->sent = 1;
 619                         data_len = pmu_data_len[req->data[0]][1];
 620                         if (data_len == 0) {
 621                                 pmu_state = idle;
 622                                 current_req = req->next;
 623                                 if (req->reply_expected)
 624                                         req_awaiting_reply = req;
 625                                 else
 626                                         pmu_done(req);
 627                         } else {
 628                                 pmu_state = reading;
 629                                 data_index = 0;
 630                                 reply_ptr = req->reply + req->reply_len;
 631                                 recv_byte();
 632                         }
 633                         break;
 634
 635                 case intack:
 636                         data_index = 0;
 637                         data_len = -1;
 638                         pmu_state = reading_intr;
 639                         reply_ptr = interrupt_data;
 640                         recv_byte();
 641                         break;
 642
 643                 case reading:
 644                 case reading_intr:
 645                         if (data_len == -1) {
 646                                 data_len = bite;
 647                                 if (bite > 32)
 648                                         printk(KERN_ERR "PMU: bad reply len %d\n",
 649                                                bite);
 650                         } else {
 651                                 reply_ptr[data_index++] = bite;
 652                         }
 653                         if (data_index < data_len) {
 654                                 recv_byte();
 655                                 break;
 656                         }
 657
 658                         if (pmu_state == reading_intr) {
 659                                 pmu_handle_data(interrupt_data, data_index);
 660                         } else {
 661                                 req = current_req;
 662                                 current_req = req->next;
 663                                 req->reply_len += data_index;
 664                                 pmu_done(req);
 665                         }
 666                         pmu_state = idle;
 667
 668                         break;
 669
 670                 default:
 671                         printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
 672                                pmu_state);
 673                 }
 674         }
 675 finish:
 676         if (pmu_state == idle) {
 677                 if (adb_int_pending) {
 678                         pmu_state = intack;
 679                         send_byte(PMU_INT_ACK);
 680                         adb_int_pending = 0;
 681                 } else if (current_req) {
 682                         pmu_start();
 683                 }
 684         }
 685
 686 #if 0
 687         printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 688                 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 689 #endif
 690         return IRQ_HANDLED;
 691 }
 692
 693 static void
 694 pmu_done(struct adb_request *req)
 695 {
 696         req->complete = 1;
 697         if (req->done)
 698                 (*req->done)(req);
 699 }
 700
 701 /* Interrupt data could be the result data from an ADB cmd */
 702 static void
 703 pmu_handle_data(unsigned char *data, int len)
 704 {
 705         static int show_pmu_ints = 1;
 706
 707         asleep = 0;
 708         if (len < 1) {
 709                 adb_int_pending = 0;
 710                 return;
 711         }
 712         if (data[0] & PMU_INT_ADB) {
 713                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
 714                         struct adb_request *req = req_awaiting_reply;
 715                         if (req == 0) {
 716                                 printk(KERN_ERR "PMU: extra ADB reply\n");
 717                                 return;
 718                         }
 719                         req_awaiting_reply = NULL;
 720                         if (len <= 2)
 721                                 req->reply_len = 0;
 722                         else {
 723                                 memcpy(req->reply, data + 1, len - 1);
 724                                 req->reply_len = len - 1;
 725                         }
 726                         pmu_done(req);
 727                 } else {
 728                         adb_input(data+1, len-1, 1);
 729                 }
 730         } else {
 731                 if (data[0] == 0x08 && len == 3) {
 732                         /* sound/brightness buttons pressed */
 733                         pmu_set_brightness(data[1] >> 3);
 734                         set_volume(data[2]);
 735                 } else if (show_pmu_ints
 736                            && !(data[0] == PMU_INT_TICK && len == 1)) {
 737                         int i;
 738                         printk(KERN_DEBUG "pmu intr");
 739                         for (i = 0; i < len; ++i)
 740                                 printk(" %.2x", data[i]);
 741                         printk("\n");
 742                 }
 743         }
 744 }
 745
 746 int backlight_level = -1;
 747 int backlight_enabled = 0;
 748
 749 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
 750
 751 static void
 752 pmu_enable_backlight(int on)
 753 {
 754         struct adb_request req;
 755
 756         if (on) {
 757             /* first call: get current backlight value */
 758             if (backlight_level < 0) {
 759                 switch(pmu_kind) {
 760                     case PMU_68K_V1:
 761                     case PMU_68K_V2:
 762                         pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
 763                         while (!req.complete)
 764                                 pmu_poll();
 765                         printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
 766                         backlight_level = req.reply[1];
 767                         break;
 768                     default:
 769                         backlight_enabled = 0;
 770                         return;
 771                 }
 772             }
 773             pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 774                 LEVEL_TO_BRIGHT(backlight_level));
 775             while (!req.complete)
 776                 pmu_poll();
 777         }
 778         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
 779             PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
 780         while (!req.complete)
 781                 pmu_poll();
 782         backlight_enabled = on;
 783 }
 784
 785 static void
 786 pmu_set_brightness(int level)
 787 {
 788         int bright;
 789
 790         backlight_level = level;
 791         bright = LEVEL_TO_BRIGHT(level);
 792         if (!backlight_enabled)
 793                 return;
 794         if (bright_req_1.complete)
 795                 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 796                     bright);
 797         if (bright_req_2.complete)
 798                 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
 799                     PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
 800 }
 801
 802 void
 803 pmu_enable_irled(int on)
 804 {
 805         struct adb_request req;
 806
 807         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
 808             (on ? PMU_POW_ON : PMU_POW_OFF));
 809         while (!req.complete)
 810                 pmu_poll();
 811 }
 812
 813 static void
 814 set_volume(int level)
 815 {
 816 }
 817
 818 int
 819 pmu_present(void)
 820 {
 821         return (pmu_kind != PMU_UNKNOWN);
 822 }
 823
 824 #if 0 /* needs some work for 68K */
 825
 826 /*
 827  * This struct is used to store config register values for
 828  * PCI devices which may get powered off when we sleep.
 829  */
 830 static struct pci_save {
 831         u16     command;
 832         u16     cache_lat;
 833         u16     intr;
 834 } *pbook_pci_saves;
 835 static int n_pbook_pci_saves;
 836
 837 static inline void
 838 pbook_pci_save(void)
 839 {
 840         int npci;
 841         struct pci_dev *pd = NULL;
 842         struct pci_save *ps;
 843
 844         npci = 0;
 845         while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL)
 846                 ++npci;
 847         n_pbook_pci_saves = npci;
 848         if (npci == 0)
 849                 return;
 850         ps = (struct pci_save *) kmalloc(npci * sizeof(*ps), GFP_KERNEL);
 851         pbook_pci_saves = ps;
 852         if (ps == NULL)
 853                 return;
 854
 855         pd = NULL;
 856         while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
 857                 pci_read_config_word(pd, PCI_COMMAND, &ps->command);
 858                 pci_read_config_word(pd, PCI_CACHE_LINE_SIZE, &ps->cache_lat);
 859                 pci_read_config_word(pd, PCI_INTERRUPT_LINE, &ps->intr);
 860                 ++ps;
 861                 --npci;
 862         }
 863 }
 864
 865 static inline void
 866 pbook_pci_restore(void)
 867 {
 868         u16 cmd;
 869         struct pci_save *ps = pbook_pci_saves;
 870         struct pci_dev *pd = NULL;
 871         int j;
 872
 873         while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
 874                 if (ps->command == 0)
 875                         continue;
 876                 pci_read_config_word(pd, PCI_COMMAND, &cmd);
 877                 if ((ps->command & ~cmd) == 0)
 878                         continue;
 879                 switch (pd->hdr_type) {
 880                 case PCI_HEADER_TYPE_NORMAL:
 881                         for (j = 0; j < 6; ++j)
 882                                 pci_write_config_dword(pd,
 883                                         PCI_BASE_ADDRESS_0 + j*4,
 884                                         pd->resource[j].start);
 885                         pci_write_config_dword(pd, PCI_ROM_ADDRESS,
 886                                pd->resource[PCI_ROM_RESOURCE].start);
 887                         pci_write_config_word(pd, PCI_CACHE_LINE_SIZE,
 888                                 ps->cache_lat);
 889                         pci_write_config_word(pd, PCI_INTERRUPT_LINE,
 890                                 ps->intr);
 891                         pci_write_config_word(pd, PCI_COMMAND, ps->command);
 892                         break;
 893                         /* other header types not restored at present */
 894                 }
 895         }
 896 }
 897
 898 /*
 899  * Put the powerbook to sleep.
 900  */
 901 #define IRQ_ENABLE      ((unsigned int *)0xf3000024)
 902 #define MEM_CTRL        ((unsigned int *)0xf8000070)
 903
 904 int powerbook_sleep(void)
 905 {
 906         int ret, i, x;
 907         static int save_backlight;
 908         static unsigned int save_irqen;
 909         unsigned long msr;
 910         unsigned int hid0;
 911         unsigned long p, wait;
 912         struct adb_request sleep_req;
 913
 914         /* Notify device drivers */
 915         ret = blocking_notifier_call_chain(&sleep_notifier_list,
 916                         PBOOK_SLEEP, NULL);
 917         if (ret & NOTIFY_STOP_MASK)
 918                 return -EBUSY;
 919
 920         /* Sync the disks. */
 921         /* XXX It would be nice to have some way to ensure that
 922          * nobody is dirtying any new buffers while we wait. */
 923         sys_sync();
 924
 925         /* Turn off the display backlight */
 926         save_backlight = backlight_enabled;
 927         if (save_backlight)
 928                 pmu_enable_backlight(0);
 929
 930         /* Give the disks a little time to actually finish writing */
 931         for (wait = jiffies + (HZ/4); time_before(jiffies, wait); )
 932                 mb();
 933
 934         /* Disable all interrupts except pmu */
 935         save_irqen = in_le32(IRQ_ENABLE);
 936         for (i = 0; i < 32; ++i)
 937                 if (i != vias->intrs[0].line && (save_irqen & (1 << i)))
 938                         disable_irq(i);
 939         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 940
 941         /* Save the state of PCI config space for some slots */
 942         pbook_pci_save();
 943
 944         /* Set the memory controller to keep the memory refreshed
 945            while we're asleep */
 946         for (i = 0x403f; i >= 0x4000; --i) {
 947                 out_be32(MEM_CTRL, i);
 948                 do {
 949                         x = (in_be32(MEM_CTRL) >> 16) & 0x3ff;
 950                 } while (x == 0);
 951                 if (x >= 0x100)
 952                         break;
 953         }
 954
 955         /* Ask the PMU to put us to sleep */
 956         pmu_request(&sleep_req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
 957         while (!sleep_req.complete)
 958                 mb();
 959         /* displacement-flush the L2 cache - necessary? */
 960         for (p = KERNELBASE; p < KERNELBASE + 0x100000; p += 0x1000)
 961                 i = *(volatile int *)p;
 962         asleep = 1;
 963
 964         /* Put the CPU into sleep mode */
 965         asm volatile("mfspr %0,1008" : "=r" (hid0) :);
 966         hid0 = (hid0 & ~(HID0_NAP | HID0_DOZE)) | HID0_SLEEP;
 967         asm volatile("mtspr 1008,%0" : : "r" (hid0));
 968         local_save_flags(msr);
 969         msr |= MSR_POW | MSR_EE;
 970         local_irq_restore(msr);
 971         udelay(10);
 972
 973         /* OK, we're awake again, start restoring things */
 974         out_be32(MEM_CTRL, 0x3f);
 975         pbook_pci_restore();
 976
 977         /* wait for the PMU interrupt sequence to complete */
 978         while (asleep)
 979                 mb();
 980
 981         /* reenable interrupts */
 982         for (i = 0; i < 32; ++i)
 983                 if (i != vias->intrs[0].line && (save_irqen & (1 << i)))
 984                         enable_irq(i);
 985
 986         /* Notify drivers */
 987         blocking_notifier_call_chain(&sleep_notifier_list, PBOOK_WAKE, NULL);
 988
 989         /* reenable ADB autopoll */
 990         pmu_adb_autopoll(adb_dev_map);
 991
 992         /* Turn on the screen backlight, if it was on before */
 993         if (save_backlight)
 994                 pmu_enable_backlight(1);
 995
 996         /* Wait for the hard disk to spin up */
 997
 998         return 0;
 999 }
1000
1001 /*
1002  * Support for /dev/pmu device
1003  */
1004 static int pmu_open(struct inode *inode, struct file *file)
1005 {
1006         return 0;
1007 }
1008
1009 static ssize_t pmu_read(struct file *file, char *buf,
1010                         size_t count, loff_t *ppos)
1011 {
1012         return 0;
1013 }
1014
1015 static ssize_t pmu_write(struct file *file, const char *buf,
1016                          size_t count, loff_t *ppos)
1017 {
1018         return 0;
1019 }
1020
1021 static int pmu_ioctl(struct inode * inode, struct file *filp,
1022                      u_int cmd, u_long arg)
1023 {
1024         int error;
1025         __u32 value;
1026
1027         switch (cmd) {
1028             case PMU_IOC_SLEEP:
1029                 return -ENOSYS;
1030             case PMU_IOC_GET_BACKLIGHT:
1031                 return put_user(backlight_level, (__u32 *)arg);
1032             case PMU_IOC_SET_BACKLIGHT:
1033                 error = get_user(value, (__u32 *)arg);
1034                 if (!error)
1035                         pmu_set_brightness(value);
1036                 return error;
1037             case PMU_IOC_GET_MODEL:
1038                 return put_user(pmu_kind, (__u32 *)arg);
1039         }
1040         return -EINVAL;
1041 }
1042
1043 static struct file_operations pmu_device_fops = {
1044         .read           = pmu_read,
1045         .write          = pmu_write,
1046         .ioctl          = pmu_ioctl,
1047         .open           = pmu_open,
1048 };
1049
1050 static struct miscdevice pmu_device = {
1051         PMU_MINOR, "pmu", &pmu_device_fops
1052 };
1053
1054 void pmu_device_init(void)
1055 {
1056         if (!via)
1057                 return;
1058         if (misc_register(&pmu_device) < 0)
1059                 printk(KERN_ERR "via-pmu68k: cannot register misc device.\n");
1060 }
1061 #endif /* CONFIG_PMAC_PBOOK */
1062