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 int init_pmu(void);
 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         .name         = "68K PMU",
 124         .probe        = pmu_probe,
 125         .init         = pmu_init,
 126         .send_request = pmu_send_request,
 127         .autopoll     = pmu_autopoll,
 128         .poll         = pmu_poll,
 129         .reset_bus    = 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 __init find_via_pmu(void)
 176 {
 177         switch (macintosh_config->adb_type) {
 178         case MAC_ADB_PB1:
 179                 pmu_kind = PMU_68K_V1;
 180                 break;
 181         case MAC_ADB_PB2:
 182                 pmu_kind = PMU_68K_V2;
 183                 break;
 184         default:
 185                 pmu_kind = PMU_UNKNOWN;
 186                 return -ENODEV;
 187         }
 188
 189         pmu_state = idle;
 190
 191         if (!init_pmu())
 192                 goto fail_init;
 193
 194         pr_info("adb: PMU 68K driver v0.5 for Unified ADB\n");
 195
 196         return 1;
 197
 198 fail_init:
 199         pmu_kind = PMU_UNKNOWN;
 200         return 0;
 201 }
 202
 203 static int pmu_probe(void)
 204 {
 205         if (pmu_kind == PMU_UNKNOWN)
 206                 return -ENODEV;
 207         return 0;
 208 }
 209
 210 static int pmu_init(void)
 211 {
 212         if (pmu_kind == PMU_UNKNOWN)
 213                 return -ENODEV;
 214         return 0;
 215 }
 216
 217 static int __init via_pmu_start(void)
 218 {
 219         if (pmu_kind == PMU_UNKNOWN)
 220                 return -ENODEV;
 221
 222         if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "PMU_SR",
 223                         pmu_interrupt)) {
 224                 pr_err("%s: can't get SR irq\n", __func__);
 225                 return -ENODEV;
 226         }
 227         if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "PMU_CL",
 228                         pmu_interrupt)) {
 229                 pr_err("%s: can't get CL irq\n", __func__);
 230                 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
 231                 return -ENODEV;
 232         }
 233
 234         pmu_fully_inited = 1;
 235
 236         /* Enable backlight */
 237         pmu_enable_backlight(1);
 238
 239         return 0;
 240 }
 241
 242 arch_initcall(via_pmu_start);
 243
 244 static int __init init_pmu(void)
 245 {
 246         int timeout;
 247         volatile struct adb_request req;
 248
 249         via2[B] |= TREQ;                                /* negate TREQ */
 250         via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
 251
 252         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
 253         timeout =  100000;
 254         while (!req.complete) {
 255                 if (--timeout < 0) {
 256                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 257                         return -EAGAIN;
 258                 }
 259                 udelay(10);
 260                 pmu_poll();
 261         }
 262
 263         /* ack all pending interrupts */
 264         timeout = 100000;
 265         interrupt_data[0] = 1;
 266         while (interrupt_data[0] || pmu_state != idle) {
 267                 if (--timeout < 0) {
 268                         printk(KERN_ERR "pmu_init: timed out acking intrs\n");
 269                         return -EAGAIN;
 270                 }
 271                 if (pmu_state == idle) {
 272                         adb_int_pending = 1;
 273                         pmu_interrupt(0, NULL);
 274                 }
 275                 pmu_poll();
 276                 udelay(10);
 277         }
 278
 279         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
 280                         PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
 281         timeout =  100000;
 282         while (!req.complete) {
 283                 if (--timeout < 0) {
 284                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 285                         return -EAGAIN;
 286                 }
 287                 udelay(10);
 288                 pmu_poll();
 289         }
 290
 291         bright_req_1.complete = 1;
 292         bright_req_2.complete = 1;
 293         bright_req_3.complete = 1;
 294
 295         return 1;
 296 }
 297
 298 int
 299 pmu_get_model(void)
 300 {
 301         return pmu_kind;
 302 }
 303
 304 /* Send an ADB command */
 305 static int
 306 pmu_send_request(struct adb_request *req, int sync)
 307 {
 308     int i, ret;
 309
 310     if (!pmu_fully_inited)
 311     {
 312         req->complete = 1;
 313         return -ENXIO;
 314    }
 315
 316     ret = -EINVAL;
 317
 318     switch (req->data[0]) {
 319     case PMU_PACKET:
 320                 for (i = 0; i < req->nbytes - 1; ++i)
 321                         req->data[i] = req->data[i+1];
 322                 --req->nbytes;
 323                 if (pmu_data_len[req->data[0]][1] != 0) {
 324                         req->reply[0] = ADB_RET_OK;
 325                         req->reply_len = 1;
 326                 } else
 327                         req->reply_len = 0;
 328                 ret = pmu_queue_request(req);
 329                 break;
 330     case CUDA_PACKET:
 331                 switch (req->data[1]) {
 332                 case CUDA_GET_TIME:
 333                         if (req->nbytes != 2)
 334                                 break;
 335                         req->data[0] = PMU_READ_RTC;
 336                         req->nbytes = 1;
 337                         req->reply_len = 3;
 338                         req->reply[0] = CUDA_PACKET;
 339                         req->reply[1] = 0;
 340                         req->reply[2] = CUDA_GET_TIME;
 341                         ret = pmu_queue_request(req);
 342                         break;
 343                 case CUDA_SET_TIME:
 344                         if (req->nbytes != 6)
 345                                 break;
 346                         req->data[0] = PMU_SET_RTC;
 347                         req->nbytes = 5;
 348                         for (i = 1; i <= 4; ++i)
 349                                 req->data[i] = req->data[i+1];
 350                         req->reply_len = 3;
 351                         req->reply[0] = CUDA_PACKET;
 352                         req->reply[1] = 0;
 353                         req->reply[2] = CUDA_SET_TIME;
 354                         ret = pmu_queue_request(req);
 355                         break;
 356                 case CUDA_GET_PRAM:
 357                         if (req->nbytes != 4)
 358                                 break;
 359                         req->data[0] = PMU_READ_NVRAM;
 360                         req->data[1] = req->data[2];
 361                         req->data[2] = req->data[3];
 362                         req->nbytes = 3;
 363                         req->reply_len = 3;
 364                         req->reply[0] = CUDA_PACKET;
 365                         req->reply[1] = 0;
 366                         req->reply[2] = CUDA_GET_PRAM;
 367                         ret = pmu_queue_request(req);
 368                         break;
 369                 case CUDA_SET_PRAM:
 370                         if (req->nbytes != 5)
 371                                 break;
 372                         req->data[0] = PMU_WRITE_NVRAM;
 373                         req->data[1] = req->data[2];
 374                         req->data[2] = req->data[3];
 375                         req->data[3] = req->data[4];
 376                         req->nbytes = 4;
 377                         req->reply_len = 3;
 378                         req->reply[0] = CUDA_PACKET;
 379                         req->reply[1] = 0;
 380                         req->reply[2] = CUDA_SET_PRAM;
 381                         ret = pmu_queue_request(req);
 382                         break;
 383                 }
 384                 break;
 385     case ADB_PACKET:
 386                 for (i = req->nbytes - 1; i > 1; --i)
 387                         req->data[i+2] = req->data[i];
 388                 req->data[3] = req->nbytes - 2;
 389                 req->data[2] = pmu_adb_flags;
 390                 /*req->data[1] = req->data[1];*/
 391                 req->data[0] = PMU_ADB_CMD;
 392                 req->nbytes += 2;
 393                 req->reply_expected = 1;
 394                 req->reply_len = 0;
 395                 ret = pmu_queue_request(req);
 396                 break;
 397     }
 398     if (ret)
 399     {
 400         req->complete = 1;
 401         return ret;
 402     }
 403
 404     if (sync) {
 405         while (!req->complete)
 406                 pmu_poll();
 407     }
 408
 409     return 0;
 410 }
 411
 412 /* Enable/disable autopolling */
 413 static int
 414 pmu_autopoll(int devs)
 415 {
 416         struct adb_request req;
 417
 418         if (!pmu_fully_inited) return -ENXIO;
 419
 420         if (devs) {
 421                 adb_dev_map = devs;
 422                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
 423                             adb_dev_map >> 8, adb_dev_map);
 424                 pmu_adb_flags = 2;
 425         } else {
 426                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
 427                 pmu_adb_flags = 0;
 428         }
 429         while (!req.complete)
 430                 pmu_poll();
 431         return 0;
 432 }
 433
 434 /* Reset the ADB bus */
 435 static int
 436 pmu_reset_bus(void)
 437 {
 438         struct adb_request req;
 439         long timeout;
 440         int save_autopoll = adb_dev_map;
 441
 442         if (!pmu_fully_inited) return -ENXIO;
 443
 444         /* anyone got a better idea?? */
 445         pmu_autopoll(0);
 446
 447         req.nbytes = 5;
 448         req.done = NULL;
 449         req.data[0] = PMU_ADB_CMD;
 450         req.data[1] = 0;
 451         req.data[2] = 3; /* ADB_BUSRESET ??? */
 452         req.data[3] = 0;
 453         req.data[4] = 0;
 454         req.reply_len = 0;
 455         req.reply_expected = 1;
 456         if (pmu_queue_request(&req) != 0)
 457         {
 458                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
 459                 return -EIO;
 460         }
 461         while (!req.complete)
 462                 pmu_poll();
 463         timeout = 100000;
 464         while (!req.complete) {
 465                 if (--timeout < 0) {
 466                         printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
 467                         return -EIO;
 468                 }
 469                 udelay(10);
 470                 pmu_poll();
 471         }
 472
 473         if (save_autopoll != 0)
 474                 pmu_autopoll(save_autopoll);
 475
 476         return 0;
 477 }
 478
 479 /* Construct and send a pmu request */
 480 int
 481 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
 482             int nbytes, ...)
 483 {
 484         va_list list;
 485         int i;
 486
 487         if (nbytes < 0 || nbytes > 32) {
 488                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
 489                 req->complete = 1;
 490                 return -EINVAL;
 491         }
 492         req->nbytes = nbytes;
 493         req->done = done;
 494         va_start(list, nbytes);
 495         for (i = 0; i < nbytes; ++i)
 496                 req->data[i] = va_arg(list, int);
 497         va_end(list);
 498         if (pmu_data_len[req->data[0]][1] != 0) {
 499                 req->reply[0] = ADB_RET_OK;
 500                 req->reply_len = 1;
 501         } else
 502                 req->reply_len = 0;
 503         req->reply_expected = 0;
 504         return pmu_queue_request(req);
 505 }
 506
 507 int
 508 pmu_queue_request(struct adb_request *req)
 509 {
 510         unsigned long flags;
 511         int nsend;
 512
 513         if (req->nbytes <= 0) {
 514                 req->complete = 1;
 515                 return 0;
 516         }
 517         nsend = pmu_data_len[req->data[0]][0];
 518         if (nsend >= 0 && req->nbytes != nsend + 1) {
 519                 req->complete = 1;
 520                 return -EINVAL;
 521         }
 522
 523         req->next = NULL;
 524         req->sent = 0;
 525         req->complete = 0;
 526         local_irq_save(flags);
 527
 528         if (current_req != 0) {
 529                 last_req->next = req;
 530                 last_req = req;
 531         } else {
 532                 current_req = req;
 533                 last_req = req;
 534                 if (pmu_state == idle)
 535                         pmu_start();
 536         }
 537
 538         local_irq_restore(flags);
 539         return 0;
 540 }
 541
 542 static void
 543 send_byte(int x)
 544 {
 545         via1[ACR] |= SR_CTRL;
 546         via1[SR] = x;
 547         via2[B] &= ~TREQ;               /* assert TREQ */
 548 }
 549
 550 static void
 551 recv_byte(void)
 552 {
 553         char c;
 554
 555         via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
 556         c = via1[SR];           /* resets SR */
 557         via2[B] &= ~TREQ;
 558 }
 559
 560 static void
 561 pmu_start(void)
 562 {
 563         unsigned long flags;
 564         struct adb_request *req;
 565
 566         /* assert pmu_state == idle */
 567         /* get the packet to send */
 568         local_irq_save(flags);
 569         req = current_req;
 570         if (req == 0 || pmu_state != idle
 571             || (req->reply_expected && req_awaiting_reply))
 572                 goto out;
 573
 574         pmu_state = sending;
 575         data_index = 1;
 576         data_len = pmu_data_len[req->data[0]][0];
 577
 578         /* set the shift register to shift out and send a byte */
 579         send_byte(req->data[0]);
 580
 581 out:
 582         local_irq_restore(flags);
 583 }
 584
 585 void
 586 pmu_poll(void)
 587 {
 588         unsigned long flags;
 589
 590         local_irq_save(flags);
 591         if (via1[IFR] & SR_INT) {
 592                 via1[IFR] = SR_INT;
 593                 pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
 594         }
 595         if (via1[IFR] & CB1_INT) {
 596                 via1[IFR] = CB1_INT;
 597                 pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
 598         }
 599         local_irq_restore(flags);
 600 }
 601
 602 static irqreturn_t
 603 pmu_interrupt(int irq, void *dev_id)
 604 {
 605         struct adb_request *req;
 606         int timeout, bite = 0;  /* to prevent compiler warning */
 607
 608 #if 0
 609         printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 610                 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 611 #endif
 612
 613         if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
 614                 adb_int_pending = 1;
 615         } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
 616                 if (via2[B] & TACK) {
 617                         printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
 618                 }
 619
 620                 /* if reading grab the byte */
 621                 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
 622
 623                 /* reset TREQ and wait for TACK to go high */
 624                 via2[B] |= TREQ;
 625                 timeout = 3200;
 626                 while (!(via2[B] & TACK)) {
 627                         if (--timeout < 0) {
 628                                 printk(KERN_ERR "PMU not responding (!ack)\n");
 629                                 goto finish;
 630                         }
 631                         udelay(10);
 632                 }
 633
 634                 switch (pmu_state) {
 635                 case sending:
 636                         req = current_req;
 637                         if (data_len < 0) {
 638                                 data_len = req->nbytes - 1;
 639                                 send_byte(data_len);
 640                                 break;
 641                         }
 642                         if (data_index <= data_len) {
 643                                 send_byte(req->data[data_index++]);
 644                                 break;
 645                         }
 646                         req->sent = 1;
 647                         data_len = pmu_data_len[req->data[0]][1];
 648                         if (data_len == 0) {
 649                                 pmu_state = idle;
 650                                 current_req = req->next;
 651                                 if (req->reply_expected)
 652                                         req_awaiting_reply = req;
 653                                 else
 654                                         pmu_done(req);
 655                         } else {
 656                                 pmu_state = reading;
 657                                 data_index = 0;
 658                                 reply_ptr = req->reply + req->reply_len;
 659                                 recv_byte();
 660                         }
 661                         break;
 662
 663                 case intack:
 664                         data_index = 0;
 665                         data_len = -1;
 666                         pmu_state = reading_intr;
 667                         reply_ptr = interrupt_data;
 668                         recv_byte();
 669                         break;
 670
 671                 case reading:
 672                 case reading_intr:
 673                         if (data_len == -1) {
 674                                 data_len = bite;
 675                                 if (bite > 32)
 676                                         printk(KERN_ERR "PMU: bad reply len %d\n",
 677                                                bite);
 678                         } else {
 679                                 reply_ptr[data_index++] = bite;
 680                         }
 681                         if (data_index < data_len) {
 682                                 recv_byte();
 683                                 break;
 684                         }
 685
 686                         if (pmu_state == reading_intr) {
 687                                 pmu_handle_data(interrupt_data, data_index);
 688                         } else {
 689                                 req = current_req;
 690                                 current_req = req->next;
 691                                 req->reply_len += data_index;
 692                                 pmu_done(req);
 693                         }
 694                         pmu_state = idle;
 695
 696                         break;
 697
 698                 default:
 699                         printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
 700                                pmu_state);
 701                 }
 702         }
 703 finish:
 704         if (pmu_state == idle) {
 705                 if (adb_int_pending) {
 706                         pmu_state = intack;
 707                         send_byte(PMU_INT_ACK);
 708                         adb_int_pending = 0;
 709                 } else if (current_req) {
 710                         pmu_start();
 711                 }
 712         }
 713
 714 #if 0
 715         printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 716                 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 717 #endif
 718         return IRQ_HANDLED;
 719 }
 720
 721 static void
 722 pmu_done(struct adb_request *req)
 723 {
 724         req->complete = 1;
 725         if (req->done)
 726                 (*req->done)(req);
 727 }
 728
 729 /* Interrupt data could be the result data from an ADB cmd */
 730 static void
 731 pmu_handle_data(unsigned char *data, int len)
 732 {
 733         static int show_pmu_ints = 1;
 734
 735         asleep = 0;
 736         if (len < 1) {
 737                 adb_int_pending = 0;
 738                 return;
 739         }
 740         if (data[0] & PMU_INT_ADB) {
 741                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
 742                         struct adb_request *req = req_awaiting_reply;
 743                         if (req == 0) {
 744                                 printk(KERN_ERR "PMU: extra ADB reply\n");
 745                                 return;
 746                         }
 747                         req_awaiting_reply = NULL;
 748                         if (len <= 2)
 749                                 req->reply_len = 0;
 750                         else {
 751                                 memcpy(req->reply, data + 1, len - 1);
 752                                 req->reply_len = len - 1;
 753                         }
 754                         pmu_done(req);
 755                 } else {
 756                         adb_input(data+1, len-1, 1);
 757                 }
 758         } else {
 759                 if (data[0] == 0x08 && len == 3) {
 760                         /* sound/brightness buttons pressed */
 761                         pmu_set_brightness(data[1] >> 3);
 762                         set_volume(data[2]);
 763                 } else if (show_pmu_ints
 764                            && !(data[0] == PMU_INT_TICK && len == 1)) {
 765                         int i;
 766                         printk(KERN_DEBUG "pmu intr");
 767                         for (i = 0; i < len; ++i)
 768                                 printk(" %.2x", data[i]);
 769                         printk("\n");
 770                 }
 771         }
 772 }
 773
 774 static int backlight_level = -1;
 775 static int backlight_enabled = 0;
 776
 777 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
 778
 779 static void
 780 pmu_enable_backlight(int on)
 781 {
 782         struct adb_request req;
 783
 784         if (on) {
 785             /* first call: get current backlight value */
 786             if (backlight_level < 0) {
 787                 switch(pmu_kind) {
 788                     case PMU_68K_V1:
 789                     case PMU_68K_V2:
 790                         pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
 791                         while (!req.complete)
 792                                 pmu_poll();
 793                         printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
 794                         backlight_level = req.reply[1];
 795                         break;
 796                     default:
 797                         backlight_enabled = 0;
 798                         return;
 799                 }
 800             }
 801             pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 802                 LEVEL_TO_BRIGHT(backlight_level));
 803             while (!req.complete)
 804                 pmu_poll();
 805         }
 806         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
 807             PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
 808         while (!req.complete)
 809                 pmu_poll();
 810         backlight_enabled = on;
 811 }
 812
 813 static void
 814 pmu_set_brightness(int level)
 815 {
 816         int bright;
 817
 818         backlight_level = level;
 819         bright = LEVEL_TO_BRIGHT(level);
 820         if (!backlight_enabled)
 821                 return;
 822         if (bright_req_1.complete)
 823                 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 824                     bright);
 825         if (bright_req_2.complete)
 826                 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
 827                     PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
 828 }
 829
 830 void
 831 pmu_enable_irled(int on)
 832 {
 833         struct adb_request req;
 834
 835         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
 836             (on ? PMU_POW_ON : PMU_POW_OFF));
 837         while (!req.complete)
 838                 pmu_poll();
 839 }
 840
 841 static void
 842 set_volume(int level)
 843 {
 844 }
 845
 846 int
 847 pmu_present(void)
 848 {
 849         return (pmu_kind != PMU_UNKNOWN);
 850 }