arch/powerpc/platforms/powermac/low_i2c.c

   1 /*
   2  * arch/powerpc/platforms/powermac/low_i2c.c
   3  *
   4  *  Copyright (C) 2003-2005 Ben. Herrenschmidt (benh@kernel.crashing.org)
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version
   9  *  2 of the License, or (at your option) any later version.
  10  *
  11  * The linux i2c layer isn't completely suitable for our needs for various
  12  * reasons ranging from too late initialisation to semantics not perfectly
  13  * matching some requirements of the apple platform functions etc...
  14  *
  15  * This file thus provides a simple low level unified i2c interface for
  16  * powermac that covers the various types of i2c busses used in Apple machines.
  17  * For now, keywest, PMU and SMU, though we could add Cuda, or other bit
  18  * banging busses found on older chipstes in earlier machines if we ever need
  19  * one of them.
  20  *
  21  * The drivers in this file are synchronous/blocking. In addition, the
  22  * keywest one is fairly slow due to the use of msleep instead of interrupts
  23  * as the interrupt is currently used by i2c-keywest. In the long run, we
  24  * might want to get rid of those high-level interfaces to linux i2c layer
  25  * either completely (converting all drivers) or replacing them all with a
  26  * single stub driver on top of this one. Once done, the interrupt will be
  27  * available for our use.
  28  */
  29
  30 #undef DEBUG
  31 #undef DEBUG_LOW
  32
  33 #include <linux/types.h>
  34 #include <linux/sched.h>
  35 #include <linux/init.h>
  36 #include <linux/module.h>
  37 #include <linux/adb.h>
  38 #include <linux/pmu.h>
  39 #include <linux/delay.h>
  40 #include <linux/completion.h>
  41 #include <linux/platform_device.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/timer.h>
  44 #include <linux/mutex.h>
  45 #include <asm/keylargo.h>
  46 #include <asm/uninorth.h>
  47 #include <asm/io.h>
  48 #include <asm/prom.h>
  49 #include <asm/machdep.h>
  50 #include <asm/smu.h>
  51 #include <asm/pmac_pfunc.h>
  52 #include <asm/pmac_low_i2c.h>
  53
  54 #ifdef DEBUG
  55 #define DBG(x...) do {\
  56                 printk(KERN_DEBUG "low_i2c:" x);        \
  57         } while(0)
  58 #else
  59 #define DBG(x...)
  60 #endif
  61
  62 #ifdef DEBUG_LOW
  63 #define DBG_LOW(x...) do {\
  64                 printk(KERN_DEBUG "low_i2c:" x);        \
  65         } while(0)
  66 #else
  67 #define DBG_LOW(x...)
  68 #endif
  69
  70
  71 static int pmac_i2c_force_poll = 1;
  72
  73 /*
  74  * A bus structure. Each bus in the system has such a structure associated.
  75  */
  76 struct pmac_i2c_bus
  77 {
  78         struct list_head        link;
  79         struct device_node      *controller;
  80         struct device_node      *busnode;
  81         int                     type;
  82         int                     flags;
  83         struct i2c_adapter      *adapter;
  84         void                    *hostdata;
  85         int                     channel;        /* some hosts have multiple */
  86         int                     mode;           /* current mode */
  87         struct mutex            mutex;
  88         int                     opened;
  89         int                     polled;         /* open mode */
  90         struct platform_device  *platform_dev;
  91
  92         /* ops */
  93         int (*open)(struct pmac_i2c_bus *bus);
  94         void (*close)(struct pmac_i2c_bus *bus);
  95         int (*xfer)(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
  96                     u32 subaddr, u8 *data, int len);
  97 };
  98
  99 static LIST_HEAD(pmac_i2c_busses);
 100
 101 /*
 102  * Keywest implementation
 103  */
 104
 105 struct pmac_i2c_host_kw
 106 {
 107         struct mutex            mutex;          /* Access mutex for use by
 108                                                  * i2c-keywest */
 109         void __iomem            *base;          /* register base address */
 110         int                     bsteps;         /* register stepping */
 111         int                     speed;          /* speed */
 112         int                     irq;
 113         u8                      *data;
 114         unsigned                len;
 115         int                     state;
 116         int                     rw;
 117         int                     polled;
 118         int                     result;
 119         struct completion       complete;
 120         spinlock_t              lock;
 121         struct timer_list       timeout_timer;
 122 };
 123
 124 /* Register indices */
 125 typedef enum {
 126         reg_mode = 0,
 127         reg_control,
 128         reg_status,
 129         reg_isr,
 130         reg_ier,
 131         reg_addr,
 132         reg_subaddr,
 133         reg_data
 134 } reg_t;
 135
 136 /* The Tumbler audio equalizer can be really slow sometimes */
 137 #define KW_POLL_TIMEOUT         (2*HZ)
 138
 139 /* Mode register */
 140 #define KW_I2C_MODE_100KHZ      0x00
 141 #define KW_I2C_MODE_50KHZ       0x01
 142 #define KW_I2C_MODE_25KHZ       0x02
 143 #define KW_I2C_MODE_DUMB        0x00
 144 #define KW_I2C_MODE_STANDARD    0x04
 145 #define KW_I2C_MODE_STANDARDSUB 0x08
 146 #define KW_I2C_MODE_COMBINED    0x0C
 147 #define KW_I2C_MODE_MODE_MASK   0x0C
 148 #define KW_I2C_MODE_CHAN_MASK   0xF0
 149
 150 /* Control register */
 151 #define KW_I2C_CTL_AAK          0x01
 152 #define KW_I2C_CTL_XADDR        0x02
 153 #define KW_I2C_CTL_STOP         0x04
 154 #define KW_I2C_CTL_START        0x08
 155
 156 /* Status register */
 157 #define KW_I2C_STAT_BUSY        0x01
 158 #define KW_I2C_STAT_LAST_AAK    0x02
 159 #define KW_I2C_STAT_LAST_RW     0x04
 160 #define KW_I2C_STAT_SDA         0x08
 161 #define KW_I2C_STAT_SCL         0x10
 162
 163 /* IER & ISR registers */
 164 #define KW_I2C_IRQ_DATA         0x01
 165 #define KW_I2C_IRQ_ADDR         0x02
 166 #define KW_I2C_IRQ_STOP         0x04
 167 #define KW_I2C_IRQ_START        0x08
 168 #define KW_I2C_IRQ_MASK         0x0F
 169
 170 /* State machine states */
 171 enum {
 172         state_idle,
 173         state_addr,
 174         state_read,
 175         state_write,
 176         state_stop,
 177         state_dead
 178 };
 179
 180 #define WRONG_STATE(name) do {\
 181                 printk(KERN_DEBUG "KW: wrong state. Got %s, state: %s " \
 182                        "(isr: %02x)\n", \
 183                        name, __kw_state_names[host->state], isr); \
 184         } while(0)
 185
 186 static const char *__kw_state_names[] = {
 187         "state_idle",
 188         "state_addr",
 189         "state_read",
 190         "state_write",
 191         "state_stop",
 192         "state_dead"
 193 };
 194
 195 static inline u8 __kw_read_reg(struct pmac_i2c_host_kw *host, reg_t reg)
 196 {
 197         return readb(host->base + (((unsigned int)reg) << host->bsteps));
 198 }
 199
 200 static inline void __kw_write_reg(struct pmac_i2c_host_kw *host,
 201                                   reg_t reg, u8 val)
 202 {
 203         writeb(val, host->base + (((unsigned)reg) << host->bsteps));
 204         (void)__kw_read_reg(host, reg_subaddr);
 205 }
 206
 207 #define kw_write_reg(reg, val)  __kw_write_reg(host, reg, val)
 208 #define kw_read_reg(reg)        __kw_read_reg(host, reg)
 209
 210 static u8 kw_i2c_wait_interrupt(struct pmac_i2c_host_kw *host)
 211 {
 212         int i, j;
 213         u8 isr;
 214
 215         for (i = 0; i < 1000; i++) {
 216                 isr = kw_read_reg(reg_isr) & KW_I2C_IRQ_MASK;
 217                 if (isr != 0)
 218                         return isr;
 219
 220                 /* This code is used with the timebase frozen, we cannot rely
 221                  * on udelay nor schedule when in polled mode !
 222                  * For now, just use a bogus loop....
 223                  */
 224                 if (host->polled) {
 225                         for (j = 1; j < 100000; j++)
 226                                 mb();
 227                 } else
 228                         msleep(1);
 229         }
 230         return isr;
 231 }
 232
 233 static void kw_i2c_do_stop(struct pmac_i2c_host_kw *host, int result)
 234 {
 235         kw_write_reg(reg_control, KW_I2C_CTL_STOP);
 236         host->state = state_stop;
 237         host->result = result;
 238 }
 239
 240
 241 static void kw_i2c_handle_interrupt(struct pmac_i2c_host_kw *host, u8 isr)
 242 {
 243         u8 ack;
 244
 245         DBG_LOW("kw_handle_interrupt(%s, isr: %x)\n",
 246                 __kw_state_names[host->state], isr);
 247
 248         if (host->state == state_idle) {
 249                 printk(KERN_WARNING "low_i2c: Keywest got an out of state"
 250                        " interrupt, ignoring\n");
 251                 kw_write_reg(reg_isr, isr);
 252                 return;
 253         }
 254
 255         if (isr == 0) {
 256                 printk(KERN_WARNING "low_i2c: Timeout in i2c transfer"
 257                        " on keywest !\n");
 258                 if (host->state != state_stop) {
 259                         kw_i2c_do_stop(host, -EIO);
 260                         return;
 261                 }
 262                 ack = kw_read_reg(reg_status);
 263                 if (ack & KW_I2C_STAT_BUSY)
 264                         kw_write_reg(reg_status, 0);
 265                 host->state = state_idle;
 266                 kw_write_reg(reg_ier, 0x00);
 267                 if (!host->polled)
 268                         complete(&host->complete);
 269                 return;
 270         }
 271
 272         if (isr & KW_I2C_IRQ_ADDR) {
 273                 ack = kw_read_reg(reg_status);
 274                 if (host->state != state_addr) {
 275                         WRONG_STATE("KW_I2C_IRQ_ADDR");
 276                         kw_i2c_do_stop(host, -EIO);
 277                 }
 278                 if ((ack & KW_I2C_STAT_LAST_AAK) == 0) {
 279                         host->result = -ENXIO;
 280                         host->state = state_stop;
 281                         DBG_LOW("KW: NAK on address\n");
 282                 } else {
 283                         if (host->len == 0)
 284                                 kw_i2c_do_stop(host, 0);
 285                         else if (host->rw) {
 286                                 host->state = state_read;
 287                                 if (host->len > 1)
 288                                         kw_write_reg(reg_control,
 289                                                      KW_I2C_CTL_AAK);
 290                         } else {
 291                                 host->state = state_write;
 292                                 kw_write_reg(reg_data, *(host->data++));
 293                                 host->len--;
 294                         }
 295                 }
 296                 kw_write_reg(reg_isr, KW_I2C_IRQ_ADDR);
 297         }
 298
 299         if (isr & KW_I2C_IRQ_DATA) {
 300                 if (host->state == state_read) {
 301                         *(host->data++) = kw_read_reg(reg_data);
 302                         host->len--;
 303                         kw_write_reg(reg_isr, KW_I2C_IRQ_DATA);
 304                         if (host->len == 0)
 305                                 host->state = state_stop;
 306                         else if (host->len == 1)
 307                                 kw_write_reg(reg_control, 0);
 308                 } else if (host->state == state_write) {
 309                         ack = kw_read_reg(reg_status);
 310                         if ((ack & KW_I2C_STAT_LAST_AAK) == 0) {
 311                                 DBG_LOW("KW: nack on data write\n");
 312                                 host->result = -EFBIG;
 313                                 host->state = state_stop;
 314                         } else if (host->len) {
 315                                 kw_write_reg(reg_data, *(host->data++));
 316                                 host->len--;
 317                         } else
 318                                 kw_i2c_do_stop(host, 0);
 319                 } else {
 320                         WRONG_STATE("KW_I2C_IRQ_DATA");
 321                         if (host->state != state_stop)
 322                                 kw_i2c_do_stop(host, -EIO);
 323                 }
 324                 kw_write_reg(reg_isr, KW_I2C_IRQ_DATA);
 325         }
 326
 327         if (isr & KW_I2C_IRQ_STOP) {
 328                 kw_write_reg(reg_isr, KW_I2C_IRQ_STOP);
 329                 if (host->state != state_stop) {
 330                         WRONG_STATE("KW_I2C_IRQ_STOP");
 331                         host->result = -EIO;
 332                 }
 333                 host->state = state_idle;
 334                 if (!host->polled)
 335                         complete(&host->complete);
 336         }
 337
 338         /* Below should only happen in manual mode which we don't use ... */
 339         if (isr & KW_I2C_IRQ_START)
 340                 kw_write_reg(reg_isr, KW_I2C_IRQ_START);
 341
 342 }
 343
 344 /* Interrupt handler */
 345 static irqreturn_t kw_i2c_irq(int irq, void *dev_id)
 346 {
 347         struct pmac_i2c_host_kw *host = dev_id;
 348         unsigned long flags;
 349
 350         spin_lock_irqsave(&host->lock, flags);
 351         del_timer(&host->timeout_timer);
 352         kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr));
 353         if (host->state != state_idle) {
 354                 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT;
 355                 add_timer(&host->timeout_timer);
 356         }
 357         spin_unlock_irqrestore(&host->lock, flags);
 358         return IRQ_HANDLED;
 359 }
 360
 361 static void kw_i2c_timeout(unsigned long data)
 362 {
 363         struct pmac_i2c_host_kw *host = (struct pmac_i2c_host_kw *)data;
 364         unsigned long flags;
 365
 366         spin_lock_irqsave(&host->lock, flags);
 367         kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr));
 368         if (host->state != state_idle) {
 369                 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT;
 370                 add_timer(&host->timeout_timer);
 371         }
 372         spin_unlock_irqrestore(&host->lock, flags);
 373 }
 374
 375 static int kw_i2c_open(struct pmac_i2c_bus *bus)
 376 {
 377         struct pmac_i2c_host_kw *host = bus->hostdata;
 378         mutex_lock(&host->mutex);
 379         return 0;
 380 }
 381
 382 static void kw_i2c_close(struct pmac_i2c_bus *bus)
 383 {
 384         struct pmac_i2c_host_kw *host = bus->hostdata;
 385         mutex_unlock(&host->mutex);
 386 }
 387
 388 static int kw_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
 389                        u32 subaddr, u8 *data, int len)
 390 {
 391         struct pmac_i2c_host_kw *host = bus->hostdata;
 392         u8 mode_reg = host->speed;
 393         int use_irq = host->irq != NO_IRQ && !bus->polled;
 394
 395         /* Setup mode & subaddress if any */
 396         switch(bus->mode) {
 397         case pmac_i2c_mode_dumb:
 398                 return -EINVAL;
 399         case pmac_i2c_mode_std:
 400                 mode_reg |= KW_I2C_MODE_STANDARD;
 401                 if (subsize != 0)
 402                         return -EINVAL;
 403                 break;
 404         case pmac_i2c_mode_stdsub:
 405                 mode_reg |= KW_I2C_MODE_STANDARDSUB;
 406                 if (subsize != 1)
 407                         return -EINVAL;
 408                 break;
 409         case pmac_i2c_mode_combined:
 410                 mode_reg |= KW_I2C_MODE_COMBINED;
 411                 if (subsize != 1)
 412                         return -EINVAL;
 413                 break;
 414         }
 415
 416         /* Setup channel & clear pending irqs */
 417         kw_write_reg(reg_isr, kw_read_reg(reg_isr));
 418         kw_write_reg(reg_mode, mode_reg | (bus->channel << 4));
 419         kw_write_reg(reg_status, 0);
 420
 421         /* Set up address and r/w bit, strip possible stale bus number from
 422          * address top bits
 423          */
 424         kw_write_reg(reg_addr, addrdir & 0xff);
 425
 426         /* Set up the sub address */
 427         if ((mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_STANDARDSUB
 428             || (mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_COMBINED)
 429                 kw_write_reg(reg_subaddr, subaddr);
 430
 431         /* Prepare for async operations */
 432         host->data = data;
 433         host->len = len;
 434         host->state = state_addr;
 435         host->result = 0;
 436         host->rw = (addrdir & 1);
 437         host->polled = bus->polled;
 438
 439         /* Enable interrupt if not using polled mode and interrupt is
 440          * available
 441          */
 442         if (use_irq) {
 443                 /* Clear completion */
 444                 INIT_COMPLETION(host->complete);
 445                 /* Ack stale interrupts */
 446                 kw_write_reg(reg_isr, kw_read_reg(reg_isr));
 447                 /* Arm timeout */
 448                 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT;
 449                 add_timer(&host->timeout_timer);
 450                 /* Enable emission */
 451                 kw_write_reg(reg_ier, KW_I2C_IRQ_MASK);
 452         }
 453
 454         /* Start sending address */
 455         kw_write_reg(reg_control, KW_I2C_CTL_XADDR);
 456
 457         /* Wait for completion */
 458         if (use_irq)
 459                 wait_for_completion(&host->complete);
 460         else {
 461                 while(host->state != state_idle) {
 462                         unsigned long flags;
 463
 464                         u8 isr = kw_i2c_wait_interrupt(host);
 465                         spin_lock_irqsave(&host->lock, flags);
 466                         kw_i2c_handle_interrupt(host, isr);
 467                         spin_unlock_irqrestore(&host->lock, flags);
 468                 }
 469         }
 470
 471         /* Disable emission */
 472         kw_write_reg(reg_ier, 0);
 473
 474         return host->result;
 475 }
 476
 477 static struct pmac_i2c_host_kw *__init kw_i2c_host_init(struct device_node *np)
 478 {
 479         struct pmac_i2c_host_kw *host;
 480         const u32               *psteps, *prate, *addrp;
 481         u32                     steps;
 482
 483         host = kzalloc(sizeof(struct pmac_i2c_host_kw), GFP_KERNEL);
 484         if (host == NULL) {
 485                 printk(KERN_ERR "low_i2c: Can't allocate host for %s\n",
 486                        np->full_name);
 487                 return NULL;
 488         }
 489
 490         /* Apple is kind enough to provide a valid AAPL,address property
 491          * on all i2c keywest nodes so far ... we would have to fallback
 492          * to macio parsing if that wasn't the case
 493          */
 494         addrp = of_get_property(np, "AAPL,address", NULL);
 495         if (addrp == NULL) {
 496                 printk(KERN_ERR "low_i2c: Can't find address for %s\n",
 497                        np->full_name);
 498                 kfree(host);
 499                 return NULL;
 500         }
 501         mutex_init(&host->mutex);
 502         init_completion(&host->complete);
 503         spin_lock_init(&host->lock);
 504         init_timer(&host->timeout_timer);
 505         host->timeout_timer.function = kw_i2c_timeout;
 506         host->timeout_timer.data = (unsigned long)host;
 507
 508         psteps = of_get_property(np, "AAPL,address-step", NULL);
 509         steps = psteps ? (*psteps) : 0x10;
 510         for (host->bsteps = 0; (steps & 0x01) == 0; host->bsteps++)
 511                 steps >>= 1;
 512         /* Select interface rate */
 513         host->speed = KW_I2C_MODE_25KHZ;
 514         prate = of_get_property(np, "AAPL,i2c-rate", NULL);
 515         if (prate) switch(*prate) {
 516         case 100:
 517                 host->speed = KW_I2C_MODE_100KHZ;
 518                 break;
 519         case 50:
 520                 host->speed = KW_I2C_MODE_50KHZ;
 521                 break;
 522         case 25:
 523                 host->speed = KW_I2C_MODE_25KHZ;
 524                 break;
 525         }
 526         host->irq = irq_of_parse_and_map(np, 0);
 527         if (host->irq == NO_IRQ)
 528                 printk(KERN_WARNING
 529                        "low_i2c: Failed to map interrupt for %s\n",
 530                        np->full_name);
 531
 532         host->base = ioremap((*addrp), 0x1000);
 533         if (host->base == NULL) {
 534                 printk(KERN_ERR "low_i2c: Can't map registers for %s\n",
 535                        np->full_name);
 536                 kfree(host);
 537                 return NULL;
 538         }
 539
 540         /* Make sure IRQ is disabled */
 541         kw_write_reg(reg_ier, 0);
 542
 543         /* Request chip interrupt. We set IRQF_TIMER because we don't
 544          * want that interrupt disabled between the 2 passes of driver
 545          * suspend or we'll have issues running the pfuncs
 546          */
 547         if (request_irq(host->irq, kw_i2c_irq, IRQF_TIMER, "keywest i2c", host))
 548                 host->irq = NO_IRQ;
 549
 550         printk(KERN_INFO "KeyWest i2c @0x%08x irq %d %s\n",
 551                *addrp, host->irq, np->full_name);
 552
 553         return host;
 554 }
 555
 556
 557 static void __init kw_i2c_add(struct pmac_i2c_host_kw *host,
 558                               struct device_node *controller,
 559                               struct device_node *busnode,
 560                               int channel)
 561 {
 562         struct pmac_i2c_bus *bus;
 563
 564         bus = kzalloc(sizeof(struct pmac_i2c_bus), GFP_KERNEL);
 565         if (bus == NULL)
 566                 return;
 567
 568         bus->controller = of_node_get(controller);
 569         bus->busnode = of_node_get(busnode);
 570         bus->type = pmac_i2c_bus_keywest;
 571         bus->hostdata = host;
 572         bus->channel = channel;
 573         bus->mode = pmac_i2c_mode_std;
 574         bus->open = kw_i2c_open;
 575         bus->close = kw_i2c_close;
 576         bus->xfer = kw_i2c_xfer;
 577         mutex_init(&bus->mutex);
 578         if (controller == busnode)
 579                 bus->flags = pmac_i2c_multibus;
 580         list_add(&bus->link, &pmac_i2c_busses);
 581
 582         printk(KERN_INFO " channel %d bus %s\n", channel,
 583                (controller == busnode) ? "<multibus>" : busnode->full_name);
 584 }
 585
 586 static void __init kw_i2c_probe(void)
 587 {
 588         struct device_node *np, *child, *parent;
 589
 590         /* Probe keywest-i2c busses */
 591         for_each_compatible_node(np, "i2c","keywest-i2c") {
 592                 struct pmac_i2c_host_kw *host;
 593                 int multibus, chans, i;
 594
 595                 /* Found one, init a host structure */
 596                 host = kw_i2c_host_init(np);
 597                 if (host == NULL)
 598                         continue;
 599
 600                 /* Now check if we have a multibus setup (old style) or if we
 601                  * have proper bus nodes. Note that the "new" way (proper bus
 602                  * nodes) might cause us to not create some busses that are
 603                  * kept hidden in the device-tree. In the future, we might
 604                  * want to work around that by creating busses without a node
 605                  * but not for now
 606                  */
 607                 child = of_get_next_child(np, NULL);
 608                 multibus = !child || strcmp(child->name, "i2c-bus");
 609                 of_node_put(child);
 610
 611                 /* For a multibus setup, we get the bus count based on the
 612                  * parent type
 613                  */
 614                 if (multibus) {
 615                         parent = of_get_parent(np);
 616                         if (parent == NULL)
 617                                 continue;
 618                         chans = parent->name[0] == 'u' ? 2 : 1;
 619                         for (i = 0; i < chans; i++)
 620                                 kw_i2c_add(host, np, np, i);
 621                 } else {
 622                         for (child = NULL;
 623                              (child = of_get_next_child(np, child)) != NULL;) {
 624                                 const u32 *reg = of_get_property(child,
 625                                                 "reg", NULL);
 626                                 if (reg == NULL)
 627                                         continue;
 628                                 kw_i2c_add(host, np, child, *reg);
 629                         }
 630                 }
 631         }
 632 }
 633
 634
 635 /*
 636  *
 637  * PMU implementation
 638  *
 639  */
 640
 641 #ifdef CONFIG_ADB_PMU
 642
 643 /*
 644  * i2c command block to the PMU
 645  */
 646 struct pmu_i2c_hdr {
 647         u8      bus;
 648         u8      mode;
 649         u8      bus2;
 650         u8      address;
 651         u8      sub_addr;
 652         u8      comb_addr;
 653         u8      count;
 654         u8      data[];
 655 };
 656
 657 static void pmu_i2c_complete(struct adb_request *req)
 658 {
 659         complete(req->arg);
 660 }
 661
 662 static int pmu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
 663                         u32 subaddr, u8 *data, int len)
 664 {
 665         struct adb_request *req = bus->hostdata;
 666         struct pmu_i2c_hdr *hdr = (struct pmu_i2c_hdr *)&req->data[1];
 667         struct completion comp;
 668         int read = addrdir & 1;
 669         int retry;
 670         int rc = 0;
 671
 672         /* For now, limit ourselves to 16 bytes transfers */
 673         if (len > 16)
 674                 return -EINVAL;
 675
 676         init_completion(&comp);
 677
 678         for (retry = 0; retry < 16; retry++) {
 679                 memset(req, 0, sizeof(struct adb_request));
 680                 hdr->bus = bus->channel;
 681                 hdr->count = len;
 682
 683                 switch(bus->mode) {
 684                 case pmac_i2c_mode_std:
 685                         if (subsize != 0)
 686                                 return -EINVAL;
 687                         hdr->address = addrdir;
 688                         hdr->mode = PMU_I2C_MODE_SIMPLE;
 689                         break;
 690                 case pmac_i2c_mode_stdsub:
 691                 case pmac_i2c_mode_combined:
 692                         if (subsize != 1)
 693                                 return -EINVAL;
 694                         hdr->address = addrdir & 0xfe;
 695                         hdr->comb_addr = addrdir;
 696                         hdr->sub_addr = subaddr;
 697                         if (bus->mode == pmac_i2c_mode_stdsub)
 698                                 hdr->mode = PMU_I2C_MODE_STDSUB;
 699                         else
 700                                 hdr->mode = PMU_I2C_MODE_COMBINED;
 701                         break;
 702                 default:
 703                         return -EINVAL;
 704                 }
 705
 706                 INIT_COMPLETION(comp);
 707                 req->data[0] = PMU_I2C_CMD;
 708                 req->reply[0] = 0xff;
 709                 req->nbytes = sizeof(struct pmu_i2c_hdr) + 1;
 710                 req->done = pmu_i2c_complete;
 711                 req->arg = &comp;
 712                 if (!read && len) {
 713                         memcpy(hdr->data, data, len);
 714                         req->nbytes += len;
 715                 }
 716                 rc = pmu_queue_request(req);
 717                 if (rc)
 718                         return rc;
 719                 wait_for_completion(&comp);
 720                 if (req->reply[0] == PMU_I2C_STATUS_OK)
 721                         break;
 722                 msleep(15);
 723         }
 724         if (req->reply[0] != PMU_I2C_STATUS_OK)
 725                 return -EIO;
 726
 727         for (retry = 0; retry < 16; retry++) {
 728                 memset(req, 0, sizeof(struct adb_request));
 729
 730                 /* I know that looks like a lot, slow as hell, but darwin
 731                  * does it so let's be on the safe side for now
 732                  */
 733                 msleep(15);
 734
 735                 hdr->bus = PMU_I2C_BUS_STATUS;
 736
 737                 INIT_COMPLETION(comp);
 738                 req->data[0] = PMU_I2C_CMD;
 739                 req->reply[0] = 0xff;
 740                 req->nbytes = 2;
 741                 req->done = pmu_i2c_complete;
 742                 req->arg = &comp;
 743                 rc = pmu_queue_request(req);
 744                 if (rc)
 745                         return rc;
 746                 wait_for_completion(&comp);
 747
 748                 if (req->reply[0] == PMU_I2C_STATUS_OK && !read)
 749                         return 0;
 750                 if (req->reply[0] == PMU_I2C_STATUS_DATAREAD && read) {
 751                         int rlen = req->reply_len - 1;
 752
 753                         if (rlen != len) {
 754                                 printk(KERN_WARNING "low_i2c: PMU returned %d"
 755                                        " bytes, expected %d !\n", rlen, len);
 756                                 return -EIO;
 757                         }
 758                         if (len)
 759                                 memcpy(data, &req->reply[1], len);
 760                         return 0;
 761                 }
 762         }
 763         return -EIO;
 764 }
 765
 766 static void __init pmu_i2c_probe(void)
 767 {
 768         struct pmac_i2c_bus *bus;
 769         struct device_node *busnode;
 770         int channel, sz;
 771
 772         if (!pmu_present())
 773                 return;
 774
 775         /* There might or might not be a "pmu-i2c" node, we use that
 776          * or via-pmu itself, whatever we find. I haven't seen a machine
 777          * with separate bus nodes, so we assume a multibus setup
 778          */
 779         busnode = of_find_node_by_name(NULL, "pmu-i2c");
 780         if (busnode == NULL)
 781                 busnode = of_find_node_by_name(NULL, "via-pmu");
 782         if (busnode == NULL)
 783                 return;
 784
 785         printk(KERN_INFO "PMU i2c %s\n", busnode->full_name);
 786
 787         /*
 788          * We add bus 1 and 2 only for now, bus 0 is "special"
 789          */
 790         for (channel = 1; channel <= 2; channel++) {
 791                 sz = sizeof(struct pmac_i2c_bus) + sizeof(struct adb_request);
 792                 bus = kzalloc(sz, GFP_KERNEL);
 793                 if (bus == NULL)
 794                         return;
 795
 796                 bus->controller = busnode;
 797                 bus->busnode = busnode;
 798                 bus->type = pmac_i2c_bus_pmu;
 799                 bus->channel = channel;
 800                 bus->mode = pmac_i2c_mode_std;
 801                 bus->hostdata = bus + 1;
 802                 bus->xfer = pmu_i2c_xfer;
 803                 mutex_init(&bus->mutex);
 804                 bus->flags = pmac_i2c_multibus;
 805                 list_add(&bus->link, &pmac_i2c_busses);
 806
 807                 printk(KERN_INFO " channel %d bus <multibus>\n", channel);
 808         }
 809 }
 810
 811 #endif /* CONFIG_ADB_PMU */
 812
 813
 814 /*
 815  *
 816  * SMU implementation
 817  *
 818  */
 819
 820 #ifdef CONFIG_PMAC_SMU
 821
 822 static void smu_i2c_complete(struct smu_i2c_cmd *cmd, void *misc)
 823 {
 824         complete(misc);
 825 }
 826
 827 static int smu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
 828                         u32 subaddr, u8 *data, int len)
 829 {
 830         struct smu_i2c_cmd *cmd = bus->hostdata;
 831         struct completion comp;
 832         int read = addrdir & 1;
 833         int rc = 0;
 834
 835         if ((read && len > SMU_I2C_READ_MAX) ||
 836             ((!read) && len > SMU_I2C_WRITE_MAX))
 837                 return -EINVAL;
 838
 839         memset(cmd, 0, sizeof(struct smu_i2c_cmd));
 840         cmd->info.bus = bus->channel;
 841         cmd->info.devaddr = addrdir;
 842         cmd->info.datalen = len;
 843
 844         switch(bus->mode) {
 845         case pmac_i2c_mode_std:
 846                 if (subsize != 0)
 847                         return -EINVAL;
 848                 cmd->info.type = SMU_I2C_TRANSFER_SIMPLE;
 849                 break;
 850         case pmac_i2c_mode_stdsub:
 851         case pmac_i2c_mode_combined:
 852                 if (subsize > 3 || subsize < 1)
 853                         return -EINVAL;
 854                 cmd->info.sublen = subsize;
 855                 /* that's big-endian only but heh ! */
 856                 memcpy(&cmd->info.subaddr, ((char *)&subaddr) + (4 - subsize),
 857                        subsize);
 858                 if (bus->mode == pmac_i2c_mode_stdsub)
 859                         cmd->info.type = SMU_I2C_TRANSFER_STDSUB;
 860                 else
 861                         cmd->info.type = SMU_I2C_TRANSFER_COMBINED;
 862                 break;
 863         default:
 864                 return -EINVAL;
 865         }
 866         if (!read && len)
 867                 memcpy(cmd->info.data, data, len);
 868
 869         init_completion(&comp);
 870         cmd->done = smu_i2c_complete;
 871         cmd->misc = &comp;
 872         rc = smu_queue_i2c(cmd);
 873         if (rc < 0)
 874                 return rc;
 875         wait_for_completion(&comp);
 876         rc = cmd->status;
 877
 878         if (read && len)
 879                 memcpy(data, cmd->info.data, len);
 880         return rc < 0 ? rc : 0;
 881 }
 882
 883 static void __init smu_i2c_probe(void)
 884 {
 885         struct device_node *controller, *busnode;
 886         struct pmac_i2c_bus *bus;
 887         const u32 *reg;
 888         int sz;
 889
 890         if (!smu_present())
 891                 return;
 892
 893         controller = of_find_node_by_name(NULL, "smu-i2c-control");
 894         if (controller == NULL)
 895                 controller = of_find_node_by_name(NULL, "smu");
 896         if (controller == NULL)
 897                 return;
 898
 899         printk(KERN_INFO "SMU i2c %s\n", controller->full_name);
 900
 901         /* Look for childs, note that they might not be of the right
 902          * type as older device trees mix i2c busses and other thigns
 903          * at the same level
 904          */
 905         for (busnode = NULL;
 906              (busnode = of_get_next_child(controller, busnode)) != NULL;) {
 907                 if (strcmp(busnode->type, "i2c") &&
 908                     strcmp(busnode->type, "i2c-bus"))
 909                         continue;
 910                 reg = of_get_property(busnode, "reg", NULL);
 911                 if (reg == NULL)
 912                         continue;
 913
 914                 sz = sizeof(struct pmac_i2c_bus) + sizeof(struct smu_i2c_cmd);
 915                 bus = kzalloc(sz, GFP_KERNEL);
 916                 if (bus == NULL)
 917                         return;
 918
 919                 bus->controller = controller;
 920                 bus->busnode = of_node_get(busnode);
 921                 bus->type = pmac_i2c_bus_smu;
 922                 bus->channel = *reg;
 923                 bus->mode = pmac_i2c_mode_std;
 924                 bus->hostdata = bus + 1;
 925                 bus->xfer = smu_i2c_xfer;
 926                 mutex_init(&bus->mutex);
 927                 bus->flags = 0;
 928                 list_add(&bus->link, &pmac_i2c_busses);
 929
 930                 printk(KERN_INFO " channel %x bus %s\n",
 931                        bus->channel, busnode->full_name);
 932         }
 933 }
 934
 935 #endif /* CONFIG_PMAC_SMU */
 936
 937 /*
 938  *
 939  * Core code
 940  *
 941  */
 942
 943
 944 struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node)
 945 {
 946         struct device_node *p = of_node_get(node);
 947         struct device_node *prev = NULL;
 948         struct pmac_i2c_bus *bus;
 949
 950         while(p) {
 951                 list_for_each_entry(bus, &pmac_i2c_busses, link) {
 952                         if (p == bus->busnode) {
 953                                 if (prev && bus->flags & pmac_i2c_multibus) {
 954                                         const u32 *reg;
 955                                         reg = of_get_property(prev, "reg",
 956                                                                 NULL);
 957                                         if (!reg)
 958                                                 continue;
 959                                         if (((*reg) >> 8) != bus->channel)
 960                                                 continue;
 961                                 }
 962                                 of_node_put(p);
 963                                 of_node_put(prev);
 964                                 return bus;
 965                         }
 966                 }
 967                 of_node_put(prev);
 968                 prev = p;
 969                 p = of_get_parent(p);
 970         }
 971         return NULL;
 972 }
 973 EXPORT_SYMBOL_GPL(pmac_i2c_find_bus);
 974
 975 u8 pmac_i2c_get_dev_addr(struct device_node *device)
 976 {
 977         const u32 *reg = of_get_property(device, "reg", NULL);
 978
 979         if (reg == NULL)
 980                 return 0;
 981
 982         return (*reg) & 0xff;
 983 }
 984 EXPORT_SYMBOL_GPL(pmac_i2c_get_dev_addr);
 985
 986 struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus)
 987 {
 988         return bus->controller;
 989 }
 990 EXPORT_SYMBOL_GPL(pmac_i2c_get_controller);
 991
 992 struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus)
 993 {
 994         return bus->busnode;
 995 }
 996 EXPORT_SYMBOL_GPL(pmac_i2c_get_bus_node);
 997
 998 int pmac_i2c_get_type(struct pmac_i2c_bus *bus)
 999 {
1000         return bus->type;
1001 }
1002 EXPORT_SYMBOL_GPL(pmac_i2c_get_type);
1003
1004 int pmac_i2c_get_flags(struct pmac_i2c_bus *bus)
1005 {
1006         return bus->flags;
1007 }
1008 EXPORT_SYMBOL_GPL(pmac_i2c_get_flags);
1009
1010 int pmac_i2c_get_channel(struct pmac_i2c_bus *bus)
1011 {
1012         return bus->channel;
1013 }
1014 EXPORT_SYMBOL_GPL(pmac_i2c_get_channel);
1015
1016
1017 void pmac_i2c_attach_adapter(struct pmac_i2c_bus *bus,
1018                              struct i2c_adapter *adapter)
1019 {
1020         WARN_ON(bus->adapter != NULL);
1021         bus->adapter = adapter;
1022 }
1023 EXPORT_SYMBOL_GPL(pmac_i2c_attach_adapter);
1024
1025 void pmac_i2c_detach_adapter(struct pmac_i2c_bus *bus,
1026                              struct i2c_adapter *adapter)
1027 {
1028         WARN_ON(bus->adapter != adapter);
1029         bus->adapter = NULL;
1030 }
1031 EXPORT_SYMBOL_GPL(pmac_i2c_detach_adapter);
1032
1033 struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus)
1034 {
1035         return bus->adapter;
1036 }
1037 EXPORT_SYMBOL_GPL(pmac_i2c_get_adapter);
1038
1039 struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter)
1040 {
1041         struct pmac_i2c_bus *bus;
1042
1043         list_for_each_entry(bus, &pmac_i2c_busses, link)
1044                 if (bus->adapter == adapter)
1045                         return bus;
1046         return NULL;
1047 }
1048 EXPORT_SYMBOL_GPL(pmac_i2c_adapter_to_bus);
1049
1050 int pmac_i2c_match_adapter(struct device_node *dev, struct i2c_adapter *adapter)
1051 {
1052         struct pmac_i2c_bus *bus = pmac_i2c_find_bus(dev);
1053
1054         if (bus == NULL)
1055                 return 0;
1056         return (bus->adapter == adapter);
1057 }
1058 EXPORT_SYMBOL_GPL(pmac_i2c_match_adapter);
1059
1060 int pmac_low_i2c_lock(struct device_node *np)
1061 {
1062         struct pmac_i2c_bus *bus, *found = NULL;
1063
1064         list_for_each_entry(bus, &pmac_i2c_busses, link) {
1065                 if (np == bus->controller) {
1066                         found = bus;
1067                         break;
1068                 }
1069         }
1070         if (!found)
1071                 return -ENODEV;
1072         return pmac_i2c_open(bus, 0);
1073 }
1074 EXPORT_SYMBOL_GPL(pmac_low_i2c_lock);
1075
1076 int pmac_low_i2c_unlock(struct device_node *np)
1077 {
1078         struct pmac_i2c_bus *bus, *found = NULL;
1079
1080         list_for_each_entry(bus, &pmac_i2c_busses, link) {
1081                 if (np == bus->controller) {
1082                         found = bus;
1083                         break;
1084                 }
1085         }
1086         if (!found)
1087                 return -ENODEV;
1088         pmac_i2c_close(bus);
1089         return 0;
1090 }
1091 EXPORT_SYMBOL_GPL(pmac_low_i2c_unlock);
1092
1093
1094 int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled)
1095 {
1096         int rc;
1097
1098         mutex_lock(&bus->mutex);
1099         bus->polled = polled || pmac_i2c_force_poll;
1100         bus->opened = 1;
1101         bus->mode = pmac_i2c_mode_std;
1102         if (bus->open && (rc = bus->open(bus)) != 0) {
1103                 bus->opened = 0;
1104                 mutex_unlock(&bus->mutex);
1105                 return rc;
1106         }
1107         return 0;
1108 }
1109 EXPORT_SYMBOL_GPL(pmac_i2c_open);
1110
1111 void pmac_i2c_close(struct pmac_i2c_bus *bus)
1112 {
1113         WARN_ON(!bus->opened);
1114         if (bus->close)
1115                 bus->close(bus);
1116         bus->opened = 0;
1117         mutex_unlock(&bus->mutex);
1118 }
1119 EXPORT_SYMBOL_GPL(pmac_i2c_close);
1120
1121 int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode)
1122 {
1123         WARN_ON(!bus->opened);
1124
1125         /* Report me if you see the error below as there might be a new
1126          * "combined4" mode that I need to implement for the SMU bus
1127          */
1128         if (mode < pmac_i2c_mode_dumb || mode > pmac_i2c_mode_combined) {
1129                 printk(KERN_ERR "low_i2c: Invalid mode %d requested on"
1130                        " bus %s !\n", mode, bus->busnode->full_name);
1131                 return -EINVAL;
1132         }
1133         bus->mode = mode;
1134
1135         return 0;
1136 }
1137 EXPORT_SYMBOL_GPL(pmac_i2c_setmode);
1138
1139 int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
1140                   u32 subaddr, u8 *data, int len)
1141 {
1142         int rc;
1143
1144         WARN_ON(!bus->opened);
1145
1146         DBG("xfer() chan=%d, addrdir=0x%x, mode=%d, subsize=%d, subaddr=0x%x,"
1147             " %d bytes, bus %s\n", bus->channel, addrdir, bus->mode, subsize,
1148             subaddr, len, bus->busnode->full_name);
1149
1150         rc = bus->xfer(bus, addrdir, subsize, subaddr, data, len);
1151
1152 #ifdef DEBUG
1153         if (rc)
1154                 DBG("xfer error %d\n", rc);
1155 #endif
1156         return rc;
1157 }
1158 EXPORT_SYMBOL_GPL(pmac_i2c_xfer);
1159
1160 /* some quirks for platform function decoding */
1161 enum {
1162         pmac_i2c_quirk_invmask = 0x00000001u,
1163         pmac_i2c_quirk_skip = 0x00000002u,
1164 };
1165
1166 static void pmac_i2c_devscan(void (*callback)(struct device_node *dev,
1167                                               int quirks))
1168 {
1169         struct pmac_i2c_bus *bus;
1170         struct device_node *np;
1171         static struct whitelist_ent {
1172                 char *name;
1173                 char *compatible;
1174                 int quirks;
1175         } whitelist[] = {
1176                 /* XXX Study device-tree's & apple drivers are get the quirks
1177                  * right !
1178                  */
1179                 /* Workaround: It seems that running the clockspreading
1180                  * properties on the eMac will cause lockups during boot.
1181                  * The machine seems to work fine without that. So for now,
1182                  * let's make sure i2c-hwclock doesn't match about "imic"
1183                  * clocks and we'll figure out if we really need to do
1184                  * something special about those later.
1185                  */
1186                 { "i2c-hwclock", "imic5002", pmac_i2c_quirk_skip },
1187                 { "i2c-hwclock", "imic5003", pmac_i2c_quirk_skip },
1188                 { "i2c-hwclock", NULL, pmac_i2c_quirk_invmask },
1189                 { "i2c-cpu-voltage", NULL, 0},
1190                 {  "temp-monitor", NULL, 0 },
1191                 {  "supply-monitor", NULL, 0 },
1192                 { NULL, NULL, 0 },
1193         };
1194
1195         /* Only some devices need to have platform functions instanciated
1196          * here. For now, we have a table. Others, like 9554 i2c GPIOs used
1197          * on Xserve, if we ever do a driver for them, will use their own
1198          * platform function instance
1199          */
1200         list_for_each_entry(bus, &pmac_i2c_busses, link) {
1201                 for (np = NULL;
1202                      (np = of_get_next_child(bus->busnode, np)) != NULL;) {
1203                         struct whitelist_ent *p;
1204                         /* If multibus, check if device is on that bus */
1205                         if (bus->flags & pmac_i2c_multibus)
1206                                 if (bus != pmac_i2c_find_bus(np))
1207                                         continue;
1208                         for (p = whitelist; p->name != NULL; p++) {
1209                                 if (strcmp(np->name, p->name))
1210                                         continue;
1211                                 if (p->compatible &&
1212                                     !of_device_is_compatible(np, p->compatible))
1213                                         continue;
1214                                 if (p->quirks & pmac_i2c_quirk_skip)
1215                                         break;
1216                                 callback(np, p->quirks);
1217                                 break;
1218                         }
1219                 }
1220         }
1221 }
1222
1223 #define MAX_I2C_DATA    64
1224
1225 struct pmac_i2c_pf_inst
1226 {
1227         struct pmac_i2c_bus     *bus;
1228         u8                      addr;
1229         u8                      buffer[MAX_I2C_DATA];
1230         u8                      scratch[MAX_I2C_DATA];
1231         int                     bytes;
1232         int                     quirks;
1233 };
1234
1235 static void* pmac_i2c_do_begin(struct pmf_function *func, struct pmf_args *args)
1236 {
1237         struct pmac_i2c_pf_inst *inst;
1238         struct pmac_i2c_bus     *bus;
1239
1240         bus = pmac_i2c_find_bus(func->node);
1241         if (bus == NULL) {
1242                 printk(KERN_ERR "low_i2c: Can't find bus for %s (pfunc)\n",
1243                        func->node->full_name);
1244                 return NULL;
1245         }
1246         if (pmac_i2c_open(bus, 0)) {
1247                 printk(KERN_ERR "low_i2c: Can't open i2c bus for %s (pfunc)\n",
1248                        func->node->full_name);
1249                 return NULL;
1250         }
1251
1252         /* XXX might need GFP_ATOMIC when called during the suspend process,
1253          * but then, there are already lots of issues with suspending when
1254          * near OOM that need to be resolved, the allocator itself should
1255          * probably make GFP_NOIO implicit during suspend
1256          */
1257         inst = kzalloc(sizeof(struct pmac_i2c_pf_inst), GFP_KERNEL);
1258         if (inst == NULL) {
1259                 pmac_i2c_close(bus);
1260                 return NULL;
1261         }
1262         inst->bus = bus;
1263         inst->addr = pmac_i2c_get_dev_addr(func->node);
1264         inst->quirks = (int)(long)func->driver_data;
1265         return inst;
1266 }
1267
1268 static void pmac_i2c_do_end(struct pmf_function *func, void *instdata)
1269 {
1270         struct pmac_i2c_pf_inst *inst = instdata;
1271
1272         if (inst == NULL)
1273                 return;
1274         pmac_i2c_close(inst->bus);
1275         if (inst)
1276                 kfree(inst);
1277 }
1278
1279 static int pmac_i2c_do_read(PMF_STD_ARGS, u32 len)
1280 {
1281         struct pmac_i2c_pf_inst *inst = instdata;
1282
1283         inst->bytes = len;
1284         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 0, 0,
1285                              inst->buffer, len);
1286 }
1287
1288 static int pmac_i2c_do_write(PMF_STD_ARGS, u32 len, const u8 *data)
1289 {
1290         struct pmac_i2c_pf_inst *inst = instdata;
1291
1292         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0,
1293                              (u8 *)data, len);
1294 }
1295
1296 /* This function is used to do the masking & OR'ing for the "rmw" type
1297  * callbacks. Ze should apply the mask and OR in the values in the
1298  * buffer before writing back. The problem is that it seems that
1299  * various darwin drivers implement the mask/or differently, thus
1300  * we need to check the quirks first
1301  */
1302 static void pmac_i2c_do_apply_rmw(struct pmac_i2c_pf_inst *inst,
1303                                   u32 len, const u8 *mask, const u8 *val)
1304 {
1305         int i;
1306
1307         if (inst->quirks & pmac_i2c_quirk_invmask) {
1308                 for (i = 0; i < len; i ++)
1309                         inst->scratch[i] = (inst->buffer[i] & mask[i]) | val[i];
1310         } else {
1311                 for (i = 0; i < len; i ++)
1312                         inst->scratch[i] = (inst->buffer[i] & ~mask[i])
1313                                 | (val[i] & mask[i]);
1314         }
1315 }
1316
1317 static int pmac_i2c_do_rmw(PMF_STD_ARGS, u32 masklen, u32 valuelen,
1318                            u32 totallen, const u8 *maskdata,
1319                            const u8 *valuedata)
1320 {
1321         struct pmac_i2c_pf_inst *inst = instdata;
1322
1323         if (masklen > inst->bytes || valuelen > inst->bytes ||
1324             totallen > inst->bytes || valuelen > masklen)
1325                 return -EINVAL;
1326
1327         pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata);
1328
1329         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0,
1330                              inst->scratch, totallen);
1331 }
1332
1333 static int pmac_i2c_do_read_sub(PMF_STD_ARGS, u8 subaddr, u32 len)
1334 {
1335         struct pmac_i2c_pf_inst *inst = instdata;
1336
1337         inst->bytes = len;
1338         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 1, subaddr,
1339                              inst->buffer, len);
1340 }
1341
1342 static int pmac_i2c_do_write_sub(PMF_STD_ARGS, u8 subaddr, u32 len,
1343                                      const u8 *data)
1344 {
1345         struct pmac_i2c_pf_inst *inst = instdata;
1346
1347         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1,
1348                              subaddr, (u8 *)data, len);
1349 }
1350
1351 static int pmac_i2c_do_set_mode(PMF_STD_ARGS, int mode)
1352 {
1353         struct pmac_i2c_pf_inst *inst = instdata;
1354
1355         return pmac_i2c_setmode(inst->bus, mode);
1356 }
1357
1358 static int pmac_i2c_do_rmw_sub(PMF_STD_ARGS, u8 subaddr, u32 masklen,
1359                                u32 valuelen, u32 totallen, const u8 *maskdata,
1360                                const u8 *valuedata)
1361 {
1362         struct pmac_i2c_pf_inst *inst = instdata;
1363
1364         if (masklen > inst->bytes || valuelen > inst->bytes ||
1365             totallen > inst->bytes || valuelen > masklen)
1366                 return -EINVAL;
1367
1368         pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata);
1369
1370         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1,
1371                              subaddr, inst->scratch, totallen);
1372 }
1373
1374 static int pmac_i2c_do_mask_and_comp(PMF_STD_ARGS, u32 len,
1375                                      const u8 *maskdata,
1376                                      const u8 *valuedata)
1377 {
1378         struct pmac_i2c_pf_inst *inst = instdata;
1379         int i, match;
1380
1381         /* Get return value pointer, it's assumed to be a u32 */
1382         if (!args || !args->count || !args->u[0].p)
1383                 return -EINVAL;
1384
1385         /* Check buffer */
1386         if (len > inst->bytes)
1387                 return -EINVAL;
1388
1389         for (i = 0, match = 1; match && i < len; i ++)
1390                 if ((inst->buffer[i] & maskdata[i]) != valuedata[i])
1391                         match = 0;
1392         *args->u[0].p = match;
1393         return 0;
1394 }
1395
1396 static int pmac_i2c_do_delay(PMF_STD_ARGS, u32 duration)
1397 {
1398         msleep((duration + 999) / 1000);
1399         return 0;
1400 }
1401
1402
1403 static struct pmf_handlers pmac_i2c_pfunc_handlers = {
1404         .begin                  = pmac_i2c_do_begin,
1405         .end                    = pmac_i2c_do_end,
1406         .read_i2c               = pmac_i2c_do_read,
1407         .write_i2c              = pmac_i2c_do_write,
1408         .rmw_i2c                = pmac_i2c_do_rmw,
1409         .read_i2c_sub           = pmac_i2c_do_read_sub,
1410         .write_i2c_sub          = pmac_i2c_do_write_sub,
1411         .rmw_i2c_sub            = pmac_i2c_do_rmw_sub,
1412         .set_i2c_mode           = pmac_i2c_do_set_mode,
1413         .mask_and_compare       = pmac_i2c_do_mask_and_comp,
1414         .delay                  = pmac_i2c_do_delay,
1415 };
1416
1417 static void __init pmac_i2c_dev_create(struct device_node *np, int quirks)
1418 {
1419         DBG("dev_create(%s)\n", np->full_name);
1420
1421         pmf_register_driver(np, &pmac_i2c_pfunc_handlers,
1422                             (void *)(long)quirks);
1423 }
1424
1425 static void __init pmac_i2c_dev_init(struct device_node *np, int quirks)
1426 {
1427         DBG("dev_create(%s)\n", np->full_name);
1428
1429         pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_INIT, NULL);
1430 }
1431
1432 static void pmac_i2c_dev_suspend(struct device_node *np, int quirks)
1433 {
1434         DBG("dev_suspend(%s)\n", np->full_name);
1435         pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_SLEEP, NULL);
1436 }
1437
1438 static void pmac_i2c_dev_resume(struct device_node *np, int quirks)
1439 {
1440         DBG("dev_resume(%s)\n", np->full_name);
1441         pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_WAKE, NULL);
1442 }
1443
1444 void pmac_pfunc_i2c_suspend(void)
1445 {
1446         pmac_i2c_devscan(pmac_i2c_dev_suspend);
1447 }
1448
1449 void pmac_pfunc_i2c_resume(void)
1450 {
1451         pmac_i2c_devscan(pmac_i2c_dev_resume);
1452 }
1453
1454 /*
1455  * Initialize us: probe all i2c busses on the machine, instantiate
1456  * busses and platform functions as needed.
1457  */
1458 /* This is non-static as it might be called early by smp code */
1459 int __init pmac_i2c_init(void)
1460 {
1461         static int i2c_inited;
1462
1463         if (i2c_inited)
1464                 return 0;
1465         i2c_inited = 1;
1466
1467         /* Probe keywest-i2c busses */
1468         kw_i2c_probe();
1469
1470 #ifdef CONFIG_ADB_PMU
1471         /* Probe PMU i2c busses */
1472         pmu_i2c_probe();
1473 #endif
1474
1475 #ifdef CONFIG_PMAC_SMU
1476         /* Probe SMU i2c busses */
1477         smu_i2c_probe();
1478 #endif
1479
1480         /* Now add plaform functions for some known devices */
1481         pmac_i2c_devscan(pmac_i2c_dev_create);
1482
1483         return 0;
1484 }
1485 machine_arch_initcall(powermac, pmac_i2c_init);
1486
1487 /* Since pmac_i2c_init can be called too early for the platform device
1488  * registration, we need to do it at a later time. In our case, subsys
1489  * happens to fit well, though I agree it's a bit of a hack...
1490  */
1491 static int __init pmac_i2c_create_platform_devices(void)
1492 {
1493         struct pmac_i2c_bus *bus;
1494         int i = 0;
1495
1496         /* In the case where we are initialized from smp_init(), we must
1497          * not use the timer (and thus the irq). It's safe from now on
1498          * though
1499          */
1500         pmac_i2c_force_poll = 0;
1501
1502         /* Create platform devices */
1503         list_for_each_entry(bus, &pmac_i2c_busses, link) {
1504                 bus->platform_dev =
1505                         platform_device_alloc("i2c-powermac", i++);
1506                 if (bus->platform_dev == NULL)
1507                         return -ENOMEM;
1508                 bus->platform_dev->dev.platform_data = bus;
1509                 platform_device_add(bus->platform_dev);
1510         }
1511
1512         /* Now call platform "init" functions */
1513         pmac_i2c_devscan(pmac_i2c_dev_init);
1514
1515         return 0;
1516 }
1517 machine_subsys_initcall(powermac, pmac_i2c_create_platform_devices);