drivers/macintosh/via-pmu68k.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Device driver for the PMU on 68K-based Apple PowerBooks
   4  *
   5  * The VIA (versatile interface adapter) interfaces to the PMU,
   6  * a 6805 microprocessor core whose primary function is to control
   7  * battery charging and system power on the PowerBooks.
   8  * The PMU also controls the ADB (Apple Desktop Bus) which connects
   9  * to the keyboard and mouse, as well as the non-volatile RAM
  10  * and the RTC (real time clock) chip.
  11  *
  12  * Adapted for 68K PMU by Joshua M. Thompson
  13  *
  14  * Based largely on the PowerMac PMU code by Paul Mackerras and
  15  * Fabio Riccardi.
  16  *
  17  * Also based on the PMU driver from MkLinux by Apple Computer, Inc.
  18  * and the Open Software Foundation, Inc.
  19  */
  20
  21 #include <stdarg.h>
  22 #include <linux/types.h>
  23 #include <linux/errno.h>
  24 #include <linux/kernel.h>
  25 #include <linux/delay.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/pci.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/irq.h>
  42 #include <linux/uaccess.h>
  43
  44 /* Misc minor number allocated for /dev/pmu */
  45 #define PMU_MINOR       154
  46
  47 /* VIA registers - spaced 0x200 bytes apart */
  48 #define RS              0x200           /* skip between registers */
  49 #define B               0               /* B-side data */
  50 #define A               RS              /* A-side data */
  51 #define DIRB            (2*RS)          /* B-side direction (1=output) */
  52 #define DIRA            (3*RS)          /* A-side direction (1=output) */
  53 #define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
  54 #define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
  55 #define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
  56 #define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
  57 #define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
  58 #define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
  59 #define SR              (10*RS)         /* Shift register */
  60 #define ACR             (11*RS)         /* Auxiliary control register */
  61 #define PCR             (12*RS)         /* Peripheral control register */
  62 #define IFR             (13*RS)         /* Interrupt flag register */
  63 #define IER             (14*RS)         /* Interrupt enable register */
  64 #define ANH             (15*RS)         /* A-side data, no handshake */
  65
  66 /* Bits in B data register: both active low */
  67 #define TACK            0x02            /* Transfer acknowledge (input) */
  68 #define TREQ            0x04            /* Transfer request (output) */
  69
  70 /* Bits in ACR */
  71 #define SR_CTRL         0x1c            /* Shift register control bits */
  72 #define SR_EXT          0x0c            /* Shift on external clock */
  73 #define SR_OUT          0x10            /* Shift out if 1 */
  74
  75 /* Bits in IFR and IER */
  76 #define SR_INT          0x04            /* Shift register full/empty */
  77 #define CB1_INT         0x10            /* transition on CB1 input */
  78
  79 static enum pmu_state {
  80         idle,
  81         sending,
  82         intack,
  83         reading,
  84         reading_intr,
  85 } pmu_state;
  86
  87 static struct adb_request *current_req;
  88 static struct adb_request *last_req;
  89 static struct adb_request *req_awaiting_reply;
  90 static unsigned char interrupt_data[32];
  91 static unsigned char *reply_ptr;
  92 static int data_index;
  93 static int data_len;
  94 static int adb_int_pending;
  95 static int pmu_adb_flags;
  96 static int adb_dev_map;
  97 static struct adb_request bright_req_1, bright_req_2, bright_req_3;
  98 static int pmu_kind = PMU_UNKNOWN;
  99 static int pmu_fully_inited;
 100
 101 int asleep;
 102
 103 static int pmu_probe(void);
 104 static int pmu_init(void);
 105 static void pmu_start(void);
 106 static irqreturn_t pmu_interrupt(int irq, void *arg);
 107 static int pmu_send_request(struct adb_request *req, int sync);
 108 static int pmu_autopoll(int devs);
 109 void pmu_poll(void);
 110 static int pmu_reset_bus(void);
 111
 112 static void pmu_start(void);
 113 static void send_byte(int x);
 114 static void recv_byte(void);
 115 static void pmu_done(struct adb_request *req);
 116 static void pmu_handle_data(unsigned char *data, int len);
 117 static void set_volume(int level);
 118 static void pmu_enable_backlight(int on);
 119 static void pmu_set_brightness(int level);
 120
 121 struct adb_driver via_pmu_driver = {
 122         "68K PMU",
 123         pmu_probe,
 124         pmu_init,
 125         pmu_send_request,
 126         pmu_autopoll,
 127         pmu_poll,
 128         pmu_reset_bus
 129 };
 130
 131 /*
 132  * This table indicates for each PMU opcode:
 133  * - the number of data bytes to be sent with the command, or -1
 134  *   if a length byte should be sent,
 135  * - the number of response bytes which the PMU will return, or
 136  *   -1 if it will send a length byte.
 137  */
 138 static s8 pmu_data_len[256][2] = {
 139 /*         0       1       2       3       4       5       6       7  */
 140 /*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 141 /*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 142 /*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 143 /*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
 144 /*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
 145 /*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
 146 /*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 147 /*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
 148 /*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 149 /*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
 150 /*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
 151 /*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
 152 /*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 153 /*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
 154 /*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 155 /*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
 156 /*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 157 /*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 158 /*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 159 /*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 160 /*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
 161 /*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 162 /*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 163 /*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 164 /*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 165 /*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 166 /*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 167 /*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
 168 /*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
 169 /*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
 170 /*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 171 /*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 172 };
 173
 174 int pmu_probe(void)
 175 {
 176         if (macintosh_config->adb_type == MAC_ADB_PB1) {
 177                 pmu_kind = PMU_68K_V1;
 178         } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 179                 pmu_kind = PMU_68K_V2;
 180         } else {
 181                 return -ENODEV;
 182         }
 183
 184         pmu_state = idle;
 185
 186         return 0;
 187 }
 188
 189 static int
 190 pmu_init(void)
 191 {
 192         int timeout;
 193         volatile struct adb_request req;
 194
 195         via2[B] |= TREQ;                                /* negate TREQ */
 196         via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
 197
 198         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
 199         timeout =  100000;
 200         while (!req.complete) {
 201                 if (--timeout < 0) {
 202                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 203                         return -EAGAIN;
 204                 }
 205                 udelay(10);
 206                 pmu_poll();
 207         }
 208
 209         /* ack all pending interrupts */
 210         timeout = 100000;
 211         interrupt_data[0] = 1;
 212         while (interrupt_data[0] || pmu_state != idle) {
 213                 if (--timeout < 0) {
 214                         printk(KERN_ERR "pmu_init: timed out acking intrs\n");
 215                         return -EAGAIN;
 216                 }
 217                 if (pmu_state == idle) {
 218                         adb_int_pending = 1;
 219                         pmu_interrupt(0, NULL);
 220                 }
 221                 pmu_poll();
 222                 udelay(10);
 223         }
 224
 225         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
 226                         PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
 227         timeout =  100000;
 228         while (!req.complete) {
 229                 if (--timeout < 0) {
 230                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 231                         return -EAGAIN;
 232                 }
 233                 udelay(10);
 234                 pmu_poll();
 235         }
 236
 237         bright_req_1.complete = 1;
 238         bright_req_2.complete = 1;
 239         bright_req_3.complete = 1;
 240
 241         if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
 242                         pmu_interrupt)) {
 243                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
 244                         IRQ_MAC_ADB_SR);
 245                 return -EAGAIN;
 246         }
 247         if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
 248                         pmu_interrupt)) {
 249                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
 250                         IRQ_MAC_ADB_CL);
 251                 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
 252                 return -EAGAIN;
 253         }
 254
 255         pmu_fully_inited = 1;
 256
 257         /* Enable backlight */
 258         pmu_enable_backlight(1);
 259
 260         printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
 261
 262         return 0;
 263 }
 264
 265 int
 266 pmu_get_model(void)
 267 {
 268         return pmu_kind;
 269 }
 270
 271 /* Send an ADB command */
 272 static int
 273 pmu_send_request(struct adb_request *req, int sync)
 274 {
 275     int i, ret;
 276
 277     if (!pmu_fully_inited)
 278     {
 279         req->complete = 1;
 280         return -ENXIO;
 281    }
 282
 283     ret = -EINVAL;
 284
 285     switch (req->data[0]) {
 286     case PMU_PACKET:
 287                 for (i = 0; i < req->nbytes - 1; ++i)
 288                         req->data[i] = req->data[i+1];
 289                 --req->nbytes;
 290                 if (pmu_data_len[req->data[0]][1] != 0) {
 291                         req->reply[0] = ADB_RET_OK;
 292                         req->reply_len = 1;
 293                 } else
 294                         req->reply_len = 0;
 295                 ret = pmu_queue_request(req);
 296                 break;
 297     case CUDA_PACKET:
 298                 switch (req->data[1]) {
 299                 case CUDA_GET_TIME:
 300                         if (req->nbytes != 2)
 301                                 break;
 302                         req->data[0] = PMU_READ_RTC;
 303                         req->nbytes = 1;
 304                         req->reply_len = 3;
 305                         req->reply[0] = CUDA_PACKET;
 306                         req->reply[1] = 0;
 307                         req->reply[2] = CUDA_GET_TIME;
 308                         ret = pmu_queue_request(req);
 309                         break;
 310                 case CUDA_SET_TIME:
 311                         if (req->nbytes != 6)
 312                                 break;
 313                         req->data[0] = PMU_SET_RTC;
 314                         req->nbytes = 5;
 315                         for (i = 1; i <= 4; ++i)
 316                                 req->data[i] = req->data[i+1];
 317                         req->reply_len = 3;
 318                         req->reply[0] = CUDA_PACKET;
 319                         req->reply[1] = 0;
 320                         req->reply[2] = CUDA_SET_TIME;
 321                         ret = pmu_queue_request(req);
 322                         break;
 323                 case CUDA_GET_PRAM:
 324                         if (req->nbytes != 4)
 325                                 break;
 326                         req->data[0] = PMU_READ_NVRAM;
 327                         req->data[1] = req->data[2];
 328                         req->data[2] = req->data[3];
 329                         req->nbytes = 3;
 330                         req->reply_len = 3;
 331                         req->reply[0] = CUDA_PACKET;
 332                         req->reply[1] = 0;
 333                         req->reply[2] = CUDA_GET_PRAM;
 334                         ret = pmu_queue_request(req);
 335                         break;
 336                 case CUDA_SET_PRAM:
 337                         if (req->nbytes != 5)
 338                                 break;
 339                         req->data[0] = PMU_WRITE_NVRAM;
 340                         req->data[1] = req->data[2];
 341                         req->data[2] = req->data[3];
 342                         req->data[3] = req->data[4];
 343                         req->nbytes = 4;
 344                         req->reply_len = 3;
 345                         req->reply[0] = CUDA_PACKET;
 346                         req->reply[1] = 0;
 347                         req->reply[2] = CUDA_SET_PRAM;
 348                         ret = pmu_queue_request(req);
 349                         break;
 350                 }
 351                 break;
 352     case ADB_PACKET:
 353                 for (i = req->nbytes - 1; i > 1; --i)
 354                         req->data[i+2] = req->data[i];
 355                 req->data[3] = req->nbytes - 2;
 356                 req->data[2] = pmu_adb_flags;
 357                 /*req->data[1] = req->data[1];*/
 358                 req->data[0] = PMU_ADB_CMD;
 359                 req->nbytes += 2;
 360                 req->reply_expected = 1;
 361                 req->reply_len = 0;
 362                 ret = pmu_queue_request(req);
 363                 break;
 364     }
 365     if (ret)
 366     {
 367         req->complete = 1;
 368         return ret;
 369     }
 370
 371     if (sync) {
 372         while (!req->complete)
 373                 pmu_poll();
 374     }
 375
 376     return 0;
 377 }
 378
 379 /* Enable/disable autopolling */
 380 static int
 381 pmu_autopoll(int devs)
 382 {
 383         struct adb_request req;
 384
 385         if (!pmu_fully_inited) return -ENXIO;
 386
 387         if (devs) {
 388                 adb_dev_map = devs;
 389                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
 390                             adb_dev_map >> 8, adb_dev_map);
 391                 pmu_adb_flags = 2;
 392         } else {
 393                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
 394                 pmu_adb_flags = 0;
 395         }
 396         while (!req.complete)
 397                 pmu_poll();
 398         return 0;
 399 }
 400
 401 /* Reset the ADB bus */
 402 static int
 403 pmu_reset_bus(void)
 404 {
 405         struct adb_request req;
 406         long timeout;
 407         int save_autopoll = adb_dev_map;
 408
 409         if (!pmu_fully_inited) return -ENXIO;
 410
 411         /* anyone got a better idea?? */
 412         pmu_autopoll(0);
 413
 414         req.nbytes = 5;
 415         req.done = NULL;
 416         req.data[0] = PMU_ADB_CMD;
 417         req.data[1] = 0;
 418         req.data[2] = 3; /* ADB_BUSRESET ??? */
 419         req.data[3] = 0;
 420         req.data[4] = 0;
 421         req.reply_len = 0;
 422         req.reply_expected = 1;
 423         if (pmu_queue_request(&req) != 0)
 424         {
 425                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
 426                 return -EIO;
 427         }
 428         while (!req.complete)
 429                 pmu_poll();
 430         timeout = 100000;
 431         while (!req.complete) {
 432                 if (--timeout < 0) {
 433                         printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
 434                         return -EIO;
 435                 }
 436                 udelay(10);
 437                 pmu_poll();
 438         }
 439
 440         if (save_autopoll != 0)
 441                 pmu_autopoll(save_autopoll);
 442
 443         return 0;
 444 }
 445
 446 /* Construct and send a pmu request */
 447 int
 448 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
 449             int nbytes, ...)
 450 {
 451         va_list list;
 452         int i;
 453
 454         if (nbytes < 0 || nbytes > 32) {
 455                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
 456                 req->complete = 1;
 457                 return -EINVAL;
 458         }
 459         req->nbytes = nbytes;
 460         req->done = done;
 461         va_start(list, nbytes);
 462         for (i = 0; i < nbytes; ++i)
 463                 req->data[i] = va_arg(list, int);
 464         va_end(list);
 465         if (pmu_data_len[req->data[0]][1] != 0) {
 466                 req->reply[0] = ADB_RET_OK;
 467                 req->reply_len = 1;
 468         } else
 469                 req->reply_len = 0;
 470         req->reply_expected = 0;
 471         return pmu_queue_request(req);
 472 }
 473
 474 int
 475 pmu_queue_request(struct adb_request *req)
 476 {
 477         unsigned long flags;
 478         int nsend;
 479
 480         if (req->nbytes <= 0) {
 481                 req->complete = 1;
 482                 return 0;
 483         }
 484         nsend = pmu_data_len[req->data[0]][0];
 485         if (nsend >= 0 && req->nbytes != nsend + 1) {
 486                 req->complete = 1;
 487                 return -EINVAL;
 488         }
 489
 490         req->next = NULL;
 491         req->sent = 0;
 492         req->complete = 0;
 493         local_irq_save(flags);
 494
 495         if (current_req != 0) {
 496                 last_req->next = req;
 497                 last_req = req;
 498         } else {
 499                 current_req = req;
 500                 last_req = req;
 501                 if (pmu_state == idle)
 502                         pmu_start();
 503         }
 504
 505         local_irq_restore(flags);
 506         return 0;
 507 }
 508
 509 static void
 510 send_byte(int x)
 511 {
 512         via1[ACR] |= SR_CTRL;
 513         via1[SR] = x;
 514         via2[B] &= ~TREQ;               /* assert TREQ */
 515 }
 516
 517 static void
 518 recv_byte(void)
 519 {
 520         char c;
 521
 522         via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
 523         c = via1[SR];           /* resets SR */
 524         via2[B] &= ~TREQ;
 525 }
 526
 527 static void
 528 pmu_start(void)
 529 {
 530         unsigned long flags;
 531         struct adb_request *req;
 532
 533         /* assert pmu_state == idle */
 534         /* get the packet to send */
 535         local_irq_save(flags);
 536         req = current_req;
 537         if (req == 0 || pmu_state != idle
 538             || (req->reply_expected && req_awaiting_reply))
 539                 goto out;
 540
 541         pmu_state = sending;
 542         data_index = 1;
 543         data_len = pmu_data_len[req->data[0]][0];
 544
 545         /* set the shift register to shift out and send a byte */
 546         send_byte(req->data[0]);
 547
 548 out:
 549         local_irq_restore(flags);
 550 }
 551
 552 void
 553 pmu_poll(void)
 554 {
 555         unsigned long flags;
 556
 557         local_irq_save(flags);
 558         if (via1[IFR] & SR_INT) {
 559                 via1[IFR] = SR_INT;
 560                 pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
 561         }
 562         if (via1[IFR] & CB1_INT) {
 563                 via1[IFR] = CB1_INT;
 564                 pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
 565         }
 566         local_irq_restore(flags);
 567 }
 568
 569 static irqreturn_t
 570 pmu_interrupt(int irq, void *dev_id)
 571 {
 572         struct adb_request *req;
 573         int timeout, bite = 0;  /* to prevent compiler warning */
 574
 575 #if 0
 576         printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 577                 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 578 #endif
 579
 580         if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
 581                 adb_int_pending = 1;
 582         } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
 583                 if (via2[B] & TACK) {
 584                         printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
 585                 }
 586
 587                 /* if reading grab the byte */
 588                 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
 589
 590                 /* reset TREQ and wait for TACK to go high */
 591                 via2[B] |= TREQ;
 592                 timeout = 3200;
 593                 while (!(via2[B] & TACK)) {
 594                         if (--timeout < 0) {
 595                                 printk(KERN_ERR "PMU not responding (!ack)\n");
 596                                 goto finish;
 597                         }
 598                         udelay(10);
 599                 }
 600
 601                 switch (pmu_state) {
 602                 case sending:
 603                         req = current_req;
 604                         if (data_len < 0) {
 605                                 data_len = req->nbytes - 1;
 606                                 send_byte(data_len);
 607                                 break;
 608                         }
 609                         if (data_index <= data_len) {
 610                                 send_byte(req->data[data_index++]);
 611                                 break;
 612                         }
 613                         req->sent = 1;
 614                         data_len = pmu_data_len[req->data[0]][1];
 615                         if (data_len == 0) {
 616                                 pmu_state = idle;
 617                                 current_req = req->next;
 618                                 if (req->reply_expected)
 619                                         req_awaiting_reply = req;
 620                                 else
 621                                         pmu_done(req);
 622                         } else {
 623                                 pmu_state = reading;
 624                                 data_index = 0;
 625                                 reply_ptr = req->reply + req->reply_len;
 626                                 recv_byte();
 627                         }
 628                         break;
 629
 630                 case intack:
 631                         data_index = 0;
 632                         data_len = -1;
 633                         pmu_state = reading_intr;
 634                         reply_ptr = interrupt_data;
 635                         recv_byte();
 636                         break;
 637
 638                 case reading:
 639                 case reading_intr:
 640                         if (data_len == -1) {
 641                                 data_len = bite;
 642                                 if (bite > 32)
 643                                         printk(KERN_ERR "PMU: bad reply len %d\n",
 644                                                bite);
 645                         } else {
 646                                 reply_ptr[data_index++] = bite;
 647                         }
 648                         if (data_index < data_len) {
 649                                 recv_byte();
 650                                 break;
 651                         }
 652
 653                         if (pmu_state == reading_intr) {
 654                                 pmu_handle_data(interrupt_data, data_index);
 655                         } else {
 656                                 req = current_req;
 657                                 current_req = req->next;
 658                                 req->reply_len += data_index;
 659                                 pmu_done(req);
 660                         }
 661                         pmu_state = idle;
 662
 663                         break;
 664
 665                 default:
 666                         printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
 667                                pmu_state);
 668                 }
 669         }
 670 finish:
 671         if (pmu_state == idle) {
 672                 if (adb_int_pending) {
 673                         pmu_state = intack;
 674                         send_byte(PMU_INT_ACK);
 675                         adb_int_pending = 0;
 676                 } else if (current_req) {
 677                         pmu_start();
 678                 }
 679         }
 680
 681 #if 0
 682         printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 683                 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 684 #endif
 685         return IRQ_HANDLED;
 686 }
 687
 688 static void
 689 pmu_done(struct adb_request *req)
 690 {
 691         req->complete = 1;
 692         if (req->done)
 693                 (*req->done)(req);
 694 }
 695
 696 /* Interrupt data could be the result data from an ADB cmd */
 697 static void
 698 pmu_handle_data(unsigned char *data, int len)
 699 {
 700         static int show_pmu_ints = 1;
 701
 702         asleep = 0;
 703         if (len < 1) {
 704                 adb_int_pending = 0;
 705                 return;
 706         }
 707         if (data[0] & PMU_INT_ADB) {
 708                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
 709                         struct adb_request *req = req_awaiting_reply;
 710                         if (req == 0) {
 711                                 printk(KERN_ERR "PMU: extra ADB reply\n");
 712                                 return;
 713                         }
 714                         req_awaiting_reply = NULL;
 715                         if (len <= 2)
 716                                 req->reply_len = 0;
 717                         else {
 718                                 memcpy(req->reply, data + 1, len - 1);
 719                                 req->reply_len = len - 1;
 720                         }
 721                         pmu_done(req);
 722                 } else {
 723                         adb_input(data+1, len-1, 1);
 724                 }
 725         } else {
 726                 if (data[0] == 0x08 && len == 3) {
 727                         /* sound/brightness buttons pressed */
 728                         pmu_set_brightness(data[1] >> 3);
 729                         set_volume(data[2]);
 730                 } else if (show_pmu_ints
 731                            && !(data[0] == PMU_INT_TICK && len == 1)) {
 732                         int i;
 733                         printk(KERN_DEBUG "pmu intr");
 734                         for (i = 0; i < len; ++i)
 735                                 printk(" %.2x", data[i]);
 736                         printk("\n");
 737                 }
 738         }
 739 }
 740
 741 static int backlight_level = -1;
 742 static int backlight_enabled = 0;
 743
 744 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
 745
 746 static void
 747 pmu_enable_backlight(int on)
 748 {
 749         struct adb_request req;
 750
 751         if (on) {
 752             /* first call: get current backlight value */
 753             if (backlight_level < 0) {
 754                 switch(pmu_kind) {
 755                     case PMU_68K_V1:
 756                     case PMU_68K_V2:
 757                         pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
 758                         while (!req.complete)
 759                                 pmu_poll();
 760                         printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
 761                         backlight_level = req.reply[1];
 762                         break;
 763                     default:
 764                         backlight_enabled = 0;
 765                         return;
 766                 }
 767             }
 768             pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 769                 LEVEL_TO_BRIGHT(backlight_level));
 770             while (!req.complete)
 771                 pmu_poll();
 772         }
 773         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
 774             PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
 775         while (!req.complete)
 776                 pmu_poll();
 777         backlight_enabled = on;
 778 }
 779
 780 static void
 781 pmu_set_brightness(int level)
 782 {
 783         int bright;
 784
 785         backlight_level = level;
 786         bright = LEVEL_TO_BRIGHT(level);
 787         if (!backlight_enabled)
 788                 return;
 789         if (bright_req_1.complete)
 790                 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 791                     bright);
 792         if (bright_req_2.complete)
 793                 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
 794                     PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
 795 }
 796
 797 void
 798 pmu_enable_irled(int on)
 799 {
 800         struct adb_request req;
 801
 802         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
 803             (on ? PMU_POW_ON : PMU_POW_OFF));
 804         while (!req.complete)
 805                 pmu_poll();
 806 }
 807
 808 static void
 809 set_volume(int level)
 810 {
 811 }
 812
 813 int
 814 pmu_present(void)
 815 {
 816         return (pmu_kind != PMU_UNKNOWN);
 817 }