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/mac_via.h>
  39
  40 #include <asm/pgtable.h>
  41 #include <asm/system.h>
  42 #include <asm/irq.h>
  43 #include <asm/uaccess.h>
  44
  45 /* Misc minor number allocated for /dev/pmu */
  46 #define PMU_MINOR       154
  47
  48 /* VIA registers - spaced 0x200 bytes apart */
  49 #define RS              0x200           /* skip between registers */
  50 #define B               0               /* B-side data */
  51 #define A               RS              /* A-side data */
  52 #define DIRB            (2*RS)          /* B-side direction (1=output) */
  53 #define DIRA            (3*RS)          /* A-side direction (1=output) */
  54 #define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
  55 #define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
  56 #define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
  57 #define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
  58 #define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
  59 #define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
  60 #define SR              (10*RS)         /* Shift register */
  61 #define ACR             (11*RS)         /* Auxiliary control register */
  62 #define PCR             (12*RS)         /* Peripheral control register */
  63 #define IFR             (13*RS)         /* Interrupt flag register */
  64 #define IER             (14*RS)         /* Interrupt enable register */
  65 #define ANH             (15*RS)         /* A-side data, no handshake */
  66
  67 /* Bits in B data register: both active low */
  68 #define TACK            0x02            /* Transfer acknowledge (input) */
  69 #define TREQ            0x04            /* Transfer request (output) */
  70
  71 /* Bits in ACR */
  72 #define SR_CTRL         0x1c            /* Shift register control bits */
  73 #define SR_EXT          0x0c            /* Shift on external clock */
  74 #define SR_OUT          0x10            /* Shift out if 1 */
  75
  76 /* Bits in IFR and IER */
  77 #define SR_INT          0x04            /* Shift register full/empty */
  78 #define CB1_INT         0x10            /* transition on CB1 input */
  79
  80 static enum pmu_state {
  81         idle,
  82         sending,
  83         intack,
  84         reading,
  85         reading_intr,
  86 } pmu_state;
  87
  88 static struct adb_request *current_req;
  89 static struct adb_request *last_req;
  90 static struct adb_request *req_awaiting_reply;
  91 static unsigned char interrupt_data[32];
  92 static unsigned char *reply_ptr;
  93 static int data_index;
  94 static int data_len;
  95 static int adb_int_pending;
  96 static int pmu_adb_flags;
  97 static int adb_dev_map;
  98 static struct adb_request bright_req_1, bright_req_2, bright_req_3;
  99 static int pmu_kind = PMU_UNKNOWN;
 100 static int pmu_fully_inited;
 101
 102 int asleep;
 103
 104 static int pmu_probe(void);
 105 static int pmu_init(void);
 106 static void pmu_start(void);
 107 static irqreturn_t pmu_interrupt(int irq, void *arg);
 108 static int pmu_send_request(struct adb_request *req, int sync);
 109 static int pmu_autopoll(int devs);
 110 void pmu_poll(void);
 111 static int pmu_reset_bus(void);
 112
 113 static void pmu_start(void);
 114 static void send_byte(int x);
 115 static void recv_byte(void);
 116 static void pmu_done(struct adb_request *req);
 117 static void pmu_handle_data(unsigned char *data, int len);
 118 static void set_volume(int level);
 119 static void pmu_enable_backlight(int on);
 120 static void pmu_set_brightness(int level);
 121
 122 struct adb_driver via_pmu_driver = {
 123         "68K PMU",
 124         pmu_probe,
 125         pmu_init,
 126         pmu_send_request,
 127         pmu_autopoll,
 128         pmu_poll,
 129         pmu_reset_bus
 130 };
 131
 132 /*
 133  * This table indicates for each PMU opcode:
 134  * - the number of data bytes to be sent with the command, or -1
 135  *   if a length byte should be sent,
 136  * - the number of response bytes which the PMU will return, or
 137  *   -1 if it will send a length byte.
 138  */
 139 static s8 pmu_data_len[256][2] = {
 140 /*         0       1       2       3       4       5       6       7  */
 141 /*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 142 /*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 143 /*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 144 /*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
 145 /*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
 146 /*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
 147 /*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 148 /*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
 149 /*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 150 /*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
 151 /*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
 152 /*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
 153 /*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 154 /*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
 155 /*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 156 /*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
 157 /*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 158 /*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 159 /*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 160 /*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 161 /*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
 162 /*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 163 /*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 164 /*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 165 /*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 166 /*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 167 /*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 168 /*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
 169 /*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
 170 /*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
 171 /*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 172 /*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 173 };
 174
 175 int pmu_probe(void)
 176 {
 177         if (macintosh_config->adb_type == MAC_ADB_PB1) {
 178                 pmu_kind = PMU_68K_V1;
 179         } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 180                 pmu_kind = PMU_68K_V2;
 181         } else {
 182                 return -ENODEV;
 183         }
 184
 185         pmu_state = idle;
 186
 187         return 0;
 188 }
 189
 190 static int
 191 pmu_init(void)
 192 {
 193         int timeout;
 194         volatile struct adb_request req;
 195
 196         via2[B] |= TREQ;                                /* negate TREQ */
 197         via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
 198
 199         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
 200         timeout =  100000;
 201         while (!req.complete) {
 202                 if (--timeout < 0) {
 203                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 204                         return -EAGAIN;
 205                 }
 206                 udelay(10);
 207                 pmu_poll();
 208         }
 209
 210         /* ack all pending interrupts */
 211         timeout = 100000;
 212         interrupt_data[0] = 1;
 213         while (interrupt_data[0] || pmu_state != idle) {
 214                 if (--timeout < 0) {
 215                         printk(KERN_ERR "pmu_init: timed out acking intrs\n");
 216                         return -EAGAIN;
 217                 }
 218                 if (pmu_state == idle) {
 219                         adb_int_pending = 1;
 220                         pmu_interrupt(0, NULL);
 221                 }
 222                 pmu_poll();
 223                 udelay(10);
 224         }
 225
 226         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
 227                         PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
 228         timeout =  100000;
 229         while (!req.complete) {
 230                 if (--timeout < 0) {
 231                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 232                         return -EAGAIN;
 233                 }
 234                 udelay(10);
 235                 pmu_poll();
 236         }
 237
 238         bright_req_1.complete = 1;
 239         bright_req_2.complete = 1;
 240         bright_req_3.complete = 1;
 241
 242         if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
 243                         pmu_interrupt)) {
 244                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
 245                         IRQ_MAC_ADB_SR);
 246                 return -EAGAIN;
 247         }
 248         if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
 249                         pmu_interrupt)) {
 250                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
 251                         IRQ_MAC_ADB_CL);
 252                 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
 253                 return -EAGAIN;
 254         }
 255
 256         pmu_fully_inited = 1;
 257
 258         /* Enable backlight */
 259         pmu_enable_backlight(1);
 260
 261         printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
 262
 263         return 0;
 264 }
 265
 266 int
 267 pmu_get_model(void)
 268 {
 269         return pmu_kind;
 270 }
 271
 272 /* Send an ADB command */
 273 static int
 274 pmu_send_request(struct adb_request *req, int sync)
 275 {
 276     int i, ret;
 277
 278     if (!pmu_fully_inited)
 279     {
 280         req->complete = 1;
 281         return -ENXIO;
 282    }
 283
 284     ret = -EINVAL;
 285
 286     switch (req->data[0]) {
 287     case PMU_PACKET:
 288                 for (i = 0; i < req->nbytes - 1; ++i)
 289                         req->data[i] = req->data[i+1];
 290                 --req->nbytes;
 291                 if (pmu_data_len[req->data[0]][1] != 0) {
 292                         req->reply[0] = ADB_RET_OK;
 293                         req->reply_len = 1;
 294                 } else
 295                         req->reply_len = 0;
 296                 ret = pmu_queue_request(req);
 297                 break;
 298     case CUDA_PACKET:
 299                 switch (req->data[1]) {
 300                 case CUDA_GET_TIME:
 301                         if (req->nbytes != 2)
 302                                 break;
 303                         req->data[0] = PMU_READ_RTC;
 304                         req->nbytes = 1;
 305                         req->reply_len = 3;
 306                         req->reply[0] = CUDA_PACKET;
 307                         req->reply[1] = 0;
 308                         req->reply[2] = CUDA_GET_TIME;
 309                         ret = pmu_queue_request(req);
 310                         break;
 311                 case CUDA_SET_TIME:
 312                         if (req->nbytes != 6)
 313                                 break;
 314                         req->data[0] = PMU_SET_RTC;
 315                         req->nbytes = 5;
 316                         for (i = 1; i <= 4; ++i)
 317                                 req->data[i] = req->data[i+1];
 318                         req->reply_len = 3;
 319                         req->reply[0] = CUDA_PACKET;
 320                         req->reply[1] = 0;
 321                         req->reply[2] = CUDA_SET_TIME;
 322                         ret = pmu_queue_request(req);
 323                         break;
 324                 case CUDA_GET_PRAM:
 325                         if (req->nbytes != 4)
 326                                 break;
 327                         req->data[0] = PMU_READ_NVRAM;
 328                         req->data[1] = req->data[2];
 329                         req->data[2] = req->data[3];
 330                         req->nbytes = 3;
 331                         req->reply_len = 3;
 332                         req->reply[0] = CUDA_PACKET;
 333                         req->reply[1] = 0;
 334                         req->reply[2] = CUDA_GET_PRAM;
 335                         ret = pmu_queue_request(req);
 336                         break;
 337                 case CUDA_SET_PRAM:
 338                         if (req->nbytes != 5)
 339                                 break;
 340                         req->data[0] = PMU_WRITE_NVRAM;
 341                         req->data[1] = req->data[2];
 342                         req->data[2] = req->data[3];
 343                         req->data[3] = req->data[4];
 344                         req->nbytes = 4;
 345                         req->reply_len = 3;
 346                         req->reply[0] = CUDA_PACKET;
 347                         req->reply[1] = 0;
 348                         req->reply[2] = CUDA_SET_PRAM;
 349                         ret = pmu_queue_request(req);
 350                         break;
 351                 }
 352                 break;
 353     case ADB_PACKET:
 354                 for (i = req->nbytes - 1; i > 1; --i)
 355                         req->data[i+2] = req->data[i];
 356                 req->data[3] = req->nbytes - 2;
 357                 req->data[2] = pmu_adb_flags;
 358                 /*req->data[1] = req->data[1];*/
 359                 req->data[0] = PMU_ADB_CMD;
 360                 req->nbytes += 2;
 361                 req->reply_expected = 1;
 362                 req->reply_len = 0;
 363                 ret = pmu_queue_request(req);
 364                 break;
 365     }
 366     if (ret)
 367     {
 368         req->complete = 1;
 369         return ret;
 370     }
 371
 372     if (sync) {
 373         while (!req->complete)
 374                 pmu_poll();
 375     }
 376
 377     return 0;
 378 }
 379
 380 /* Enable/disable autopolling */
 381 static int
 382 pmu_autopoll(int devs)
 383 {
 384         struct adb_request req;
 385
 386         if (!pmu_fully_inited) return -ENXIO;
 387
 388         if (devs) {
 389                 adb_dev_map = devs;
 390                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
 391                             adb_dev_map >> 8, adb_dev_map);
 392                 pmu_adb_flags = 2;
 393         } else {
 394                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
 395                 pmu_adb_flags = 0;
 396         }
 397         while (!req.complete)
 398                 pmu_poll();
 399         return 0;
 400 }
 401
 402 /* Reset the ADB bus */
 403 static int
 404 pmu_reset_bus(void)
 405 {
 406         struct adb_request req;
 407         long timeout;
 408         int save_autopoll = adb_dev_map;
 409
 410         if (!pmu_fully_inited) return -ENXIO;
 411
 412         /* anyone got a better idea?? */
 413         pmu_autopoll(0);
 414
 415         req.nbytes = 5;
 416         req.done = NULL;
 417         req.data[0] = PMU_ADB_CMD;
 418         req.data[1] = 0;
 419         req.data[2] = 3; /* ADB_BUSRESET ??? */
 420         req.data[3] = 0;
 421         req.data[4] = 0;
 422         req.reply_len = 0;
 423         req.reply_expected = 1;
 424         if (pmu_queue_request(&req) != 0)
 425         {
 426                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
 427                 return -EIO;
 428         }
 429         while (!req.complete)
 430                 pmu_poll();
 431         timeout = 100000;
 432         while (!req.complete) {
 433                 if (--timeout < 0) {
 434                         printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
 435                         return -EIO;
 436                 }
 437                 udelay(10);
 438                 pmu_poll();
 439         }
 440
 441         if (save_autopoll != 0)
 442                 pmu_autopoll(save_autopoll);
 443
 444         return 0;
 445 }
 446
 447 /* Construct and send a pmu request */
 448 int
 449 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
 450             int nbytes, ...)
 451 {
 452         va_list list;
 453         int i;
 454
 455         if (nbytes < 0 || nbytes > 32) {
 456                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
 457                 req->complete = 1;
 458                 return -EINVAL;
 459         }
 460         req->nbytes = nbytes;
 461         req->done = done;
 462         va_start(list, nbytes);
 463         for (i = 0; i < nbytes; ++i)
 464                 req->data[i] = va_arg(list, int);
 465         va_end(list);
 466         if (pmu_data_len[req->data[0]][1] != 0) {
 467                 req->reply[0] = ADB_RET_OK;
 468                 req->reply_len = 1;
 469         } else
 470                 req->reply_len = 0;
 471         req->reply_expected = 0;
 472         return pmu_queue_request(req);
 473 }
 474
 475 int
 476 pmu_queue_request(struct adb_request *req)
 477 {
 478         unsigned long flags;
 479         int nsend;
 480
 481         if (req->nbytes <= 0) {
 482                 req->complete = 1;
 483                 return 0;
 484         }
 485         nsend = pmu_data_len[req->data[0]][0];
 486         if (nsend >= 0 && req->nbytes != nsend + 1) {
 487                 req->complete = 1;
 488                 return -EINVAL;
 489         }
 490
 491         req->next = NULL;
 492         req->sent = 0;
 493         req->complete = 0;
 494         local_irq_save(flags);
 495
 496         if (current_req != 0) {
 497                 last_req->next = req;
 498                 last_req = req;
 499         } else {
 500                 current_req = req;
 501                 last_req = req;
 502                 if (pmu_state == idle)
 503                         pmu_start();
 504         }
 505
 506         local_irq_restore(flags);
 507         return 0;
 508 }
 509
 510 static void
 511 send_byte(int x)
 512 {
 513         via1[ACR] |= SR_CTRL;
 514         via1[SR] = x;
 515         via2[B] &= ~TREQ;               /* assert TREQ */
 516 }
 517
 518 static void
 519 recv_byte(void)
 520 {
 521         char c;
 522
 523         via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
 524         c = via1[SR];           /* resets SR */
 525         via2[B] &= ~TREQ;
 526 }
 527
 528 static void
 529 pmu_start(void)
 530 {
 531         unsigned long flags;
 532         struct adb_request *req;
 533
 534         /* assert pmu_state == idle */
 535         /* get the packet to send */
 536         local_irq_save(flags);
 537         req = current_req;
 538         if (req == 0 || pmu_state != idle
 539             || (req->reply_expected && req_awaiting_reply))
 540                 goto out;
 541
 542         pmu_state = sending;
 543         data_index = 1;
 544         data_len = pmu_data_len[req->data[0]][0];
 545
 546         /* set the shift register to shift out and send a byte */
 547         send_byte(req->data[0]);
 548
 549 out:
 550         local_irq_restore(flags);
 551 }
 552
 553 void
 554 pmu_poll(void)
 555 {
 556         unsigned long flags;
 557
 558         local_irq_save(flags);
 559         if (via1[IFR] & SR_INT) {
 560                 via1[IFR] = SR_INT;
 561                 pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
 562         }
 563         if (via1[IFR] & CB1_INT) {
 564                 via1[IFR] = CB1_INT;
 565                 pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
 566         }
 567         local_irq_restore(flags);
 568 }
 569
 570 static irqreturn_t
 571 pmu_interrupt(int irq, void *dev_id)
 572 {
 573         struct adb_request *req;
 574         int timeout, bite = 0;  /* to prevent compiler warning */
 575
 576 #if 0
 577         printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 578                 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 579 #endif
 580
 581         if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
 582                 adb_int_pending = 1;
 583         } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
 584                 if (via2[B] & TACK) {
 585                         printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
 586                 }
 587
 588                 /* if reading grab the byte */
 589                 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
 590
 591                 /* reset TREQ and wait for TACK to go high */
 592                 via2[B] |= TREQ;
 593                 timeout = 3200;
 594                 while (!(via2[B] & TACK)) {
 595                         if (--timeout < 0) {
 596                                 printk(KERN_ERR "PMU not responding (!ack)\n");
 597                                 goto finish;
 598                         }
 599                         udelay(10);
 600                 }
 601
 602                 switch (pmu_state) {
 603                 case sending:
 604                         req = current_req;
 605                         if (data_len < 0) {
 606                                 data_len = req->nbytes - 1;
 607                                 send_byte(data_len);
 608                                 break;
 609                         }
 610                         if (data_index <= data_len) {
 611                                 send_byte(req->data[data_index++]);
 612                                 break;
 613                         }
 614                         req->sent = 1;
 615                         data_len = pmu_data_len[req->data[0]][1];
 616                         if (data_len == 0) {
 617                                 pmu_state = idle;
 618                                 current_req = req->next;
 619                                 if (req->reply_expected)
 620                                         req_awaiting_reply = req;
 621                                 else
 622                                         pmu_done(req);
 623                         } else {
 624                                 pmu_state = reading;
 625                                 data_index = 0;
 626                                 reply_ptr = req->reply + req->reply_len;
 627                                 recv_byte();
 628                         }
 629                         break;
 630
 631                 case intack:
 632                         data_index = 0;
 633                         data_len = -1;
 634                         pmu_state = reading_intr;
 635                         reply_ptr = interrupt_data;
 636                         recv_byte();
 637                         break;
 638
 639                 case reading:
 640                 case reading_intr:
 641                         if (data_len == -1) {
 642                                 data_len = bite;
 643                                 if (bite > 32)
 644                                         printk(KERN_ERR "PMU: bad reply len %d\n",
 645                                                bite);
 646                         } else {
 647                                 reply_ptr[data_index++] = bite;
 648                         }
 649                         if (data_index < data_len) {
 650                                 recv_byte();
 651                                 break;
 652                         }
 653
 654                         if (pmu_state == reading_intr) {
 655                                 pmu_handle_data(interrupt_data, data_index);
 656                         } else {
 657                                 req = current_req;
 658                                 current_req = req->next;
 659                                 req->reply_len += data_index;
 660                                 pmu_done(req);
 661                         }
 662                         pmu_state = idle;
 663
 664                         break;
 665
 666                 default:
 667                         printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
 668                                pmu_state);
 669                 }
 670         }
 671 finish:
 672         if (pmu_state == idle) {
 673                 if (adb_int_pending) {
 674                         pmu_state = intack;
 675                         send_byte(PMU_INT_ACK);
 676                         adb_int_pending = 0;
 677                 } else if (current_req) {
 678                         pmu_start();
 679                 }
 680         }
 681
 682 #if 0
 683         printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 684                 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 685 #endif
 686         return IRQ_HANDLED;
 687 }
 688
 689 static void
 690 pmu_done(struct adb_request *req)
 691 {
 692         req->complete = 1;
 693         if (req->done)
 694                 (*req->done)(req);
 695 }
 696
 697 /* Interrupt data could be the result data from an ADB cmd */
 698 static void
 699 pmu_handle_data(unsigned char *data, int len)
 700 {
 701         static int show_pmu_ints = 1;
 702
 703         asleep = 0;
 704         if (len < 1) {
 705                 adb_int_pending = 0;
 706                 return;
 707         }
 708         if (data[0] & PMU_INT_ADB) {
 709                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
 710                         struct adb_request *req = req_awaiting_reply;
 711                         if (req == 0) {
 712                                 printk(KERN_ERR "PMU: extra ADB reply\n");
 713                                 return;
 714                         }
 715                         req_awaiting_reply = NULL;
 716                         if (len <= 2)
 717                                 req->reply_len = 0;
 718                         else {
 719                                 memcpy(req->reply, data + 1, len - 1);
 720                                 req->reply_len = len - 1;
 721                         }
 722                         pmu_done(req);
 723                 } else {
 724                         adb_input(data+1, len-1, 1);
 725                 }
 726         } else {
 727                 if (data[0] == 0x08 && len == 3) {
 728                         /* sound/brightness buttons pressed */
 729                         pmu_set_brightness(data[1] >> 3);
 730                         set_volume(data[2]);
 731                 } else if (show_pmu_ints
 732                            && !(data[0] == PMU_INT_TICK && len == 1)) {
 733                         int i;
 734                         printk(KERN_DEBUG "pmu intr");
 735                         for (i = 0; i < len; ++i)
 736                                 printk(" %.2x", data[i]);
 737                         printk("\n");
 738                 }
 739         }
 740 }
 741
 742 static int backlight_level = -1;
 743 static int backlight_enabled = 0;
 744
 745 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
 746
 747 static void
 748 pmu_enable_backlight(int on)
 749 {
 750         struct adb_request req;
 751
 752         if (on) {
 753             /* first call: get current backlight value */
 754             if (backlight_level < 0) {
 755                 switch(pmu_kind) {
 756                     case PMU_68K_V1:
 757                     case PMU_68K_V2:
 758                         pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
 759                         while (!req.complete)
 760                                 pmu_poll();
 761                         printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
 762                         backlight_level = req.reply[1];
 763                         break;
 764                     default:
 765                         backlight_enabled = 0;
 766                         return;
 767                 }
 768             }
 769             pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 770                 LEVEL_TO_BRIGHT(backlight_level));
 771             while (!req.complete)
 772                 pmu_poll();
 773         }
 774         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
 775             PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
 776         while (!req.complete)
 777                 pmu_poll();
 778         backlight_enabled = on;
 779 }
 780
 781 static void
 782 pmu_set_brightness(int level)
 783 {
 784         int bright;
 785
 786         backlight_level = level;
 787         bright = LEVEL_TO_BRIGHT(level);
 788         if (!backlight_enabled)
 789                 return;
 790         if (bright_req_1.complete)
 791                 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 792                     bright);
 793         if (bright_req_2.complete)
 794                 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
 795                     PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
 796 }
 797
 798 void
 799 pmu_enable_irled(int on)
 800 {
 801         struct adb_request req;
 802
 803         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
 804             (on ? PMU_POW_ON : PMU_POW_OFF));
 805         while (!req.complete)
 806                 pmu_poll();
 807 }
 808
 809 static void
 810 set_volume(int level)
 811 {
 812 }
 813
 814 int
 815 pmu_present(void)
 816 {
 817         return (pmu_kind != PMU_UNKNOWN);
 818 }