1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * arch/powerpc/platforms/powermac/low_i2c.c 4 * 5 * Copyright (C) 2003-2005 Ben. Herrenschmidt (benh@kernel.crashing.org) 6 * 7 * The linux i2c layer isn't completely suitable for our needs for various 8 * reasons ranging from too late initialisation to semantics not perfectly 9 * matching some requirements of the apple platform functions etc... 10 * 11 * This file thus provides a simple low level unified i2c interface for 12 * powermac that covers the various types of i2c busses used in Apple machines. 13 * For now, keywest, PMU and SMU, though we could add Cuda, or other bit 14 * banging busses found on older chipsets in earlier machines if we ever need 15 * one of them. 16 * 17 * The drivers in this file are synchronous/blocking. In addition, the 18 * keywest one is fairly slow due to the use of msleep instead of interrupts 19 * as the interrupt is currently used by i2c-keywest. In the long run, we 20 * might want to get rid of those high-level interfaces to linux i2c layer 21 * either completely (converting all drivers) or replacing them all with a 22 * single stub driver on top of this one. Once done, the interrupt will be 23 * available for our use. 24 */ 25 26 #undef DEBUG 27 #undef DEBUG_LOW 28 29 #include <linux/types.h> 30 #include <linux/sched.h> 31 #include <linux/init.h> 32 #include <linux/export.h> 33 #include <linux/adb.h> 34 #include <linux/pmu.h> 35 #include <linux/delay.h> 36 #include <linux/completion.h> 37 #include <linux/platform_device.h> 38 #include <linux/interrupt.h> 39 #include <linux/timer.h> 40 #include <linux/mutex.h> 41 #include <linux/i2c.h> 42 #include <linux/slab.h> 43 #include <linux/of_irq.h> 44 #include <asm/keylargo.h> 45 #include <asm/uninorth.h> 46 #include <asm/io.h> 47 #include <asm/machdep.h> 48 #include <asm/smu.h> 49 #include <asm/pmac_pfunc.h> 50 #include <asm/pmac_low_i2c.h> 51 52 #ifdef DEBUG 53 #define DBG(x...) do {\ 54 printk(KERN_DEBUG "low_i2c:" x); \ 55 } while(0) 56 #else 57 #define DBG(x...) 58 #endif 59 60 #ifdef DEBUG_LOW 61 #define DBG_LOW(x...) do {\ 62 printk(KERN_DEBUG "low_i2c:" x); \ 63 } while(0) 64 #else 65 #define DBG_LOW(x...) 66 #endif 67 68 69 static int pmac_i2c_force_poll = 1; 70 71 /* 72 * A bus structure. Each bus in the system has such a structure associated. 73 */ 74 struct pmac_i2c_bus 75 { 76 struct list_head link; 77 struct device_node *controller; 78 struct device_node *busnode; 79 int type; 80 int flags; 81 struct i2c_adapter adapter; 82 void *hostdata; 83 int channel; /* some hosts have multiple */ 84 int mode; /* current mode */ 85 struct mutex mutex; 86 int opened; 87 int polled; /* open mode */ 88 struct platform_device *platform_dev; 89 struct lock_class_key lock_key; 90 91 /* ops */ 92 int (*open)(struct pmac_i2c_bus *bus); 93 void (*close)(struct pmac_i2c_bus *bus); 94 int (*xfer)(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, 95 u32 subaddr, u8 *data, int len); 96 }; 97 98 static LIST_HEAD(pmac_i2c_busses); 99 100 /* 101 * Keywest implementation 102 */ 103 104 struct pmac_i2c_host_kw 105 { 106 struct mutex mutex; /* Access mutex for use by 107 * i2c-keywest */ 108 void __iomem *base; /* register base address */ 109 int bsteps; /* register stepping */ 110 int speed; /* speed */ 111 int irq; 112 u8 *data; 113 unsigned len; 114 int state; 115 int rw; 116 int polled; 117 int result; 118 struct completion complete; 119 spinlock_t lock; 120 struct timer_list timeout_timer; 121 }; 122 123 /* Register indices */ 124 typedef enum { 125 reg_mode = 0, 126 reg_control, 127 reg_status, 128 reg_isr, 129 reg_ier, 130 reg_addr, 131 reg_subaddr, 132 reg_data 133 } reg_t; 134 135 /* The Tumbler audio equalizer can be really slow sometimes */ 136 #define KW_POLL_TIMEOUT (2*HZ) 137 138 /* Mode register */ 139 #define KW_I2C_MODE_100KHZ 0x00 140 #define KW_I2C_MODE_50KHZ 0x01 141 #define KW_I2C_MODE_25KHZ 0x02 142 #define KW_I2C_MODE_DUMB 0x00 143 #define KW_I2C_MODE_STANDARD 0x04 144 #define KW_I2C_MODE_STANDARDSUB 0x08 145 #define KW_I2C_MODE_COMBINED 0x0C 146 #define KW_I2C_MODE_MODE_MASK 0x0C 147 #define KW_I2C_MODE_CHAN_MASK 0xF0 148 149 /* Control register */ 150 #define KW_I2C_CTL_AAK 0x01 151 #define KW_I2C_CTL_XADDR 0x02 152 #define KW_I2C_CTL_STOP 0x04 153 #define KW_I2C_CTL_START 0x08 154 155 /* Status register */ 156 #define KW_I2C_STAT_BUSY 0x01 157 #define KW_I2C_STAT_LAST_AAK 0x02 158 #define KW_I2C_STAT_LAST_RW 0x04 159 #define KW_I2C_STAT_SDA 0x08 160 #define KW_I2C_STAT_SCL 0x10 161 162 /* IER & ISR registers */ 163 #define KW_I2C_IRQ_DATA 0x01 164 #define KW_I2C_IRQ_ADDR 0x02 165 #define KW_I2C_IRQ_STOP 0x04 166 #define KW_I2C_IRQ_START 0x08 167 #define KW_I2C_IRQ_MASK 0x0F 168 169 /* State machine states */ 170 enum { 171 state_idle, 172 state_addr, 173 state_read, 174 state_write, 175 state_stop, 176 state_dead 177 }; 178 179 #define WRONG_STATE(name) do {\ 180 printk(KERN_DEBUG "KW: wrong state. Got %s, state: %s " \ 181 "(isr: %02x)\n", \ 182 name, __kw_state_names[host->state], isr); \ 183 } while(0) 184 185 static const char *__kw_state_names[] = { 186 "state_idle", 187 "state_addr", 188 "state_read", 189 "state_write", 190 "state_stop", 191 "state_dead" 192 }; 193 194 static inline u8 __kw_read_reg(struct pmac_i2c_host_kw *host, reg_t reg) 195 { 196 return readb(host->base + (((unsigned int)reg) << host->bsteps)); 197 } 198 199 static inline void __kw_write_reg(struct pmac_i2c_host_kw *host, 200 reg_t reg, u8 val) 201 { 202 writeb(val, host->base + (((unsigned)reg) << host->bsteps)); 203 (void)__kw_read_reg(host, reg_subaddr); 204 } 205 206 #define kw_write_reg(reg, val) __kw_write_reg(host, reg, val) 207 #define kw_read_reg(reg) __kw_read_reg(host, reg) 208 209 static u8 kw_i2c_wait_interrupt(struct pmac_i2c_host_kw *host) 210 { 211 int i, j; 212 u8 isr; 213 214 for (i = 0; i < 1000; i++) { 215 isr = kw_read_reg(reg_isr) & KW_I2C_IRQ_MASK; 216 if (isr != 0) 217 return isr; 218 219 /* This code is used with the timebase frozen, we cannot rely 220 * on udelay nor schedule when in polled mode ! 221 * For now, just use a bogus loop.... 222 */ 223 if (host->polled) { 224 for (j = 1; j < 100000; j++) 225 mb(); 226 } else 227 msleep(1); 228 } 229 return isr; 230 } 231 232 static void kw_i2c_do_stop(struct pmac_i2c_host_kw *host, int result) 233 { 234 kw_write_reg(reg_control, KW_I2C_CTL_STOP); 235 host->state = state_stop; 236 host->result = result; 237 } 238 239 240 static void kw_i2c_handle_interrupt(struct pmac_i2c_host_kw *host, u8 isr) 241 { 242 u8 ack; 243 244 DBG_LOW("kw_handle_interrupt(%s, isr: %x)\n", 245 __kw_state_names[host->state], isr); 246 247 if (host->state == state_idle) { 248 printk(KERN_WARNING "low_i2c: Keywest got an out of state" 249 " interrupt, ignoring\n"); 250 kw_write_reg(reg_isr, isr); 251 return; 252 } 253 254 if (isr == 0) { 255 printk(KERN_WARNING "low_i2c: Timeout in i2c transfer" 256 " on keywest !\n"); 257 if (host->state != state_stop) { 258 kw_i2c_do_stop(host, -EIO); 259 return; 260 } 261 ack = kw_read_reg(reg_status); 262 if (ack & KW_I2C_STAT_BUSY) 263 kw_write_reg(reg_status, 0); 264 host->state = state_idle; 265 kw_write_reg(reg_ier, 0x00); 266 if (!host->polled) 267 complete(&host->complete); 268 return; 269 } 270 271 if (isr & KW_I2C_IRQ_ADDR) { 272 ack = kw_read_reg(reg_status); 273 if (host->state != state_addr) { 274 WRONG_STATE("KW_I2C_IRQ_ADDR"); 275 kw_i2c_do_stop(host, -EIO); 276 } 277 if ((ack & KW_I2C_STAT_LAST_AAK) == 0) { 278 host->result = -ENXIO; 279 host->state = state_stop; 280 DBG_LOW("KW: NAK on address\n"); 281 } else { 282 if (host->len == 0) 283 kw_i2c_do_stop(host, 0); 284 else if (host->rw) { 285 host->state = state_read; 286 if (host->len > 1) 287 kw_write_reg(reg_control, 288 KW_I2C_CTL_AAK); 289 } else { 290 host->state = state_write; 291 kw_write_reg(reg_data, *(host->data++)); 292 host->len--; 293 } 294 } 295 kw_write_reg(reg_isr, KW_I2C_IRQ_ADDR); 296 } 297 298 if (isr & KW_I2C_IRQ_DATA) { 299 if (host->state == state_read) { 300 *(host->data++) = kw_read_reg(reg_data); 301 host->len--; 302 kw_write_reg(reg_isr, KW_I2C_IRQ_DATA); 303 if (host->len == 0) 304 host->state = state_stop; 305 else if (host->len == 1) 306 kw_write_reg(reg_control, 0); 307 } else if (host->state == state_write) { 308 ack = kw_read_reg(reg_status); 309 if ((ack & KW_I2C_STAT_LAST_AAK) == 0) { 310 DBG_LOW("KW: nack on data write\n"); 311 host->result = -EFBIG; 312 host->state = state_stop; 313 } else if (host->len) { 314 kw_write_reg(reg_data, *(host->data++)); 315 host->len--; 316 } else 317 kw_i2c_do_stop(host, 0); 318 } else { 319 WRONG_STATE("KW_I2C_IRQ_DATA"); 320 if (host->state != state_stop) 321 kw_i2c_do_stop(host, -EIO); 322 } 323 kw_write_reg(reg_isr, KW_I2C_IRQ_DATA); 324 } 325 326 if (isr & KW_I2C_IRQ_STOP) { 327 kw_write_reg(reg_isr, KW_I2C_IRQ_STOP); 328 if (host->state != state_stop) { 329 WRONG_STATE("KW_I2C_IRQ_STOP"); 330 host->result = -EIO; 331 } 332 host->state = state_idle; 333 if (!host->polled) 334 complete(&host->complete); 335 } 336 337 /* Below should only happen in manual mode which we don't use ... */ 338 if (isr & KW_I2C_IRQ_START) 339 kw_write_reg(reg_isr, KW_I2C_IRQ_START); 340 341 } 342 343 /* Interrupt handler */ 344 static irqreturn_t kw_i2c_irq(int irq, void *dev_id) 345 { 346 struct pmac_i2c_host_kw *host = dev_id; 347 unsigned long flags; 348 349 spin_lock_irqsave(&host->lock, flags); 350 del_timer(&host->timeout_timer); 351 kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr)); 352 if (host->state != state_idle) { 353 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT; 354 add_timer(&host->timeout_timer); 355 } 356 spin_unlock_irqrestore(&host->lock, flags); 357 return IRQ_HANDLED; 358 } 359 360 static void kw_i2c_timeout(struct timer_list *t) 361 { 362 struct pmac_i2c_host_kw *host = from_timer(host, t, timeout_timer); 363 unsigned long flags; 364 365 spin_lock_irqsave(&host->lock, flags); 366 367 /* 368 * If the timer is pending, that means we raced with the 369 * irq, in which case we just return 370 */ 371 if (timer_pending(&host->timeout_timer)) 372 goto skip; 373 374 kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr)); 375 if (host->state != state_idle) { 376 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT; 377 add_timer(&host->timeout_timer); 378 } 379 skip: 380 spin_unlock_irqrestore(&host->lock, flags); 381 } 382 383 static int kw_i2c_open(struct pmac_i2c_bus *bus) 384 { 385 struct pmac_i2c_host_kw *host = bus->hostdata; 386 mutex_lock(&host->mutex); 387 return 0; 388 } 389 390 static void kw_i2c_close(struct pmac_i2c_bus *bus) 391 { 392 struct pmac_i2c_host_kw *host = bus->hostdata; 393 mutex_unlock(&host->mutex); 394 } 395 396 static int kw_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, 397 u32 subaddr, u8 *data, int len) 398 { 399 struct pmac_i2c_host_kw *host = bus->hostdata; 400 u8 mode_reg = host->speed; 401 int use_irq = host->irq && !bus->polled; 402 403 /* Setup mode & subaddress if any */ 404 switch(bus->mode) { 405 case pmac_i2c_mode_dumb: 406 return -EINVAL; 407 case pmac_i2c_mode_std: 408 mode_reg |= KW_I2C_MODE_STANDARD; 409 if (subsize != 0) 410 return -EINVAL; 411 break; 412 case pmac_i2c_mode_stdsub: 413 mode_reg |= KW_I2C_MODE_STANDARDSUB; 414 if (subsize != 1) 415 return -EINVAL; 416 break; 417 case pmac_i2c_mode_combined: 418 mode_reg |= KW_I2C_MODE_COMBINED; 419 if (subsize != 1) 420 return -EINVAL; 421 break; 422 } 423 424 /* Setup channel & clear pending irqs */ 425 kw_write_reg(reg_isr, kw_read_reg(reg_isr)); 426 kw_write_reg(reg_mode, mode_reg | (bus->channel << 4)); 427 kw_write_reg(reg_status, 0); 428 429 /* Set up address and r/w bit, strip possible stale bus number from 430 * address top bits 431 */ 432 kw_write_reg(reg_addr, addrdir & 0xff); 433 434 /* Set up the sub address */ 435 if ((mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_STANDARDSUB 436 || (mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_COMBINED) 437 kw_write_reg(reg_subaddr, subaddr); 438 439 /* Prepare for async operations */ 440 host->data = data; 441 host->len = len; 442 host->state = state_addr; 443 host->result = 0; 444 host->rw = (addrdir & 1); 445 host->polled = bus->polled; 446 447 /* Enable interrupt if not using polled mode and interrupt is 448 * available 449 */ 450 if (use_irq) { 451 /* Clear completion */ 452 reinit_completion(&host->complete); 453 /* Ack stale interrupts */ 454 kw_write_reg(reg_isr, kw_read_reg(reg_isr)); 455 /* Arm timeout */ 456 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT; 457 add_timer(&host->timeout_timer); 458 /* Enable emission */ 459 kw_write_reg(reg_ier, KW_I2C_IRQ_MASK); 460 } 461 462 /* Start sending address */ 463 kw_write_reg(reg_control, KW_I2C_CTL_XADDR); 464 465 /* Wait for completion */ 466 if (use_irq) 467 wait_for_completion(&host->complete); 468 else { 469 while(host->state != state_idle) { 470 unsigned long flags; 471 472 u8 isr = kw_i2c_wait_interrupt(host); 473 spin_lock_irqsave(&host->lock, flags); 474 kw_i2c_handle_interrupt(host, isr); 475 spin_unlock_irqrestore(&host->lock, flags); 476 } 477 } 478 479 /* Disable emission */ 480 kw_write_reg(reg_ier, 0); 481 482 return host->result; 483 } 484 485 static struct pmac_i2c_host_kw *__init kw_i2c_host_init(struct device_node *np) 486 { 487 struct pmac_i2c_host_kw *host; 488 const u32 *psteps, *prate, *addrp; 489 u32 steps; 490 491 host = kzalloc(sizeof(*host), GFP_KERNEL); 492 if (host == NULL) { 493 printk(KERN_ERR "low_i2c: Can't allocate host for %pOF\n", 494 np); 495 return NULL; 496 } 497 498 /* Apple is kind enough to provide a valid AAPL,address property 499 * on all i2c keywest nodes so far ... we would have to fallback 500 * to macio parsing if that wasn't the case 501 */ 502 addrp = of_get_property(np, "AAPL,address", NULL); 503 if (addrp == NULL) { 504 printk(KERN_ERR "low_i2c: Can't find address for %pOF\n", 505 np); 506 kfree(host); 507 return NULL; 508 } 509 mutex_init(&host->mutex); 510 init_completion(&host->complete); 511 spin_lock_init(&host->lock); 512 timer_setup(&host->timeout_timer, kw_i2c_timeout, 0); 513 514 psteps = of_get_property(np, "AAPL,address-step", NULL); 515 steps = psteps ? (*psteps) : 0x10; 516 for (host->bsteps = 0; (steps & 0x01) == 0; host->bsteps++) 517 steps >>= 1; 518 /* Select interface rate */ 519 host->speed = KW_I2C_MODE_25KHZ; 520 prate = of_get_property(np, "AAPL,i2c-rate", NULL); 521 if (prate) switch(*prate) { 522 case 100: 523 host->speed = KW_I2C_MODE_100KHZ; 524 break; 525 case 50: 526 host->speed = KW_I2C_MODE_50KHZ; 527 break; 528 case 25: 529 host->speed = KW_I2C_MODE_25KHZ; 530 break; 531 } 532 host->irq = irq_of_parse_and_map(np, 0); 533 if (!host->irq) 534 printk(KERN_WARNING 535 "low_i2c: Failed to map interrupt for %pOF\n", 536 np); 537 538 host->base = ioremap((*addrp), 0x1000); 539 if (host->base == NULL) { 540 printk(KERN_ERR "low_i2c: Can't map registers for %pOF\n", 541 np); 542 kfree(host); 543 return NULL; 544 } 545 546 /* Make sure IRQ is disabled */ 547 kw_write_reg(reg_ier, 0); 548 549 /* Request chip interrupt. We set IRQF_NO_SUSPEND because we don't 550 * want that interrupt disabled between the 2 passes of driver 551 * suspend or we'll have issues running the pfuncs 552 */ 553 if (request_irq(host->irq, kw_i2c_irq, IRQF_NO_SUSPEND, 554 "keywest i2c", host)) 555 host->irq = 0; 556 557 printk(KERN_INFO "KeyWest i2c @0x%08x irq %d %pOF\n", 558 *addrp, host->irq, np); 559 560 return host; 561 } 562 563 564 static void __init kw_i2c_add(struct pmac_i2c_host_kw *host, 565 struct device_node *controller, 566 struct device_node *busnode, 567 int channel) 568 { 569 struct pmac_i2c_bus *bus; 570 571 bus = kzalloc(sizeof(struct pmac_i2c_bus), GFP_KERNEL); 572 if (bus == NULL) 573 return; 574 575 bus->controller = of_node_get(controller); 576 bus->busnode = of_node_get(busnode); 577 bus->type = pmac_i2c_bus_keywest; 578 bus->hostdata = host; 579 bus->channel = channel; 580 bus->mode = pmac_i2c_mode_std; 581 bus->open = kw_i2c_open; 582 bus->close = kw_i2c_close; 583 bus->xfer = kw_i2c_xfer; 584 mutex_init(&bus->mutex); 585 lockdep_register_key(&bus->lock_key); 586 lockdep_set_class(&bus->mutex, &bus->lock_key); 587 if (controller == busnode) 588 bus->flags = pmac_i2c_multibus; 589 list_add(&bus->link, &pmac_i2c_busses); 590 591 printk(KERN_INFO " channel %d bus %s\n", channel, 592 (controller == busnode) ? "<multibus>" : busnode->full_name); 593 } 594 595 static void __init kw_i2c_probe(void) 596 { 597 struct device_node *np, *child, *parent; 598 599 /* Probe keywest-i2c busses */ 600 for_each_compatible_node(np, "i2c","keywest-i2c") { 601 struct pmac_i2c_host_kw *host; 602 int multibus; 603 604 /* Found one, init a host structure */ 605 host = kw_i2c_host_init(np); 606 if (host == NULL) 607 continue; 608 609 /* Now check if we have a multibus setup (old style) or if we 610 * have proper bus nodes. Note that the "new" way (proper bus 611 * nodes) might cause us to not create some busses that are 612 * kept hidden in the device-tree. In the future, we might 613 * want to work around that by creating busses without a node 614 * but not for now 615 */ 616 child = of_get_next_child(np, NULL); 617 multibus = !of_node_name_eq(child, "i2c-bus"); 618 of_node_put(child); 619 620 /* For a multibus setup, we get the bus count based on the 621 * parent type 622 */ 623 if (multibus) { 624 int chans, i; 625 626 parent = of_get_parent(np); 627 if (parent == NULL) 628 continue; 629 chans = parent->name[0] == 'u' ? 2 : 1; 630 of_node_put(parent); 631 for (i = 0; i < chans; i++) 632 kw_i2c_add(host, np, np, i); 633 } else { 634 for_each_child_of_node(np, child) { 635 const u32 *reg = of_get_property(child, 636 "reg", NULL); 637 if (reg == NULL) 638 continue; 639 kw_i2c_add(host, np, child, *reg); 640 } 641 } 642 } 643 } 644 645 646 /* 647 * 648 * PMU implementation 649 * 650 */ 651 652 #ifdef CONFIG_ADB_PMU 653 654 /* 655 * i2c command block to the PMU 656 */ 657 struct pmu_i2c_hdr { 658 u8 bus; 659 u8 mode; 660 u8 bus2; 661 u8 address; 662 u8 sub_addr; 663 u8 comb_addr; 664 u8 count; 665 u8 data[]; 666 }; 667 668 static void pmu_i2c_complete(struct adb_request *req) 669 { 670 complete(req->arg); 671 } 672 673 static int pmu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, 674 u32 subaddr, u8 *data, int len) 675 { 676 struct adb_request *req = bus->hostdata; 677 struct pmu_i2c_hdr *hdr = (struct pmu_i2c_hdr *)&req->data[1]; 678 struct completion comp; 679 int read = addrdir & 1; 680 int retry; 681 int rc = 0; 682 683 /* For now, limit ourselves to 16 bytes transfers */ 684 if (len > 16) 685 return -EINVAL; 686 687 init_completion(&comp); 688 689 for (retry = 0; retry < 16; retry++) { 690 memset(req, 0, sizeof(struct adb_request)); 691 hdr->bus = bus->channel; 692 hdr->count = len; 693 694 switch(bus->mode) { 695 case pmac_i2c_mode_std: 696 if (subsize != 0) 697 return -EINVAL; 698 hdr->address = addrdir; 699 hdr->mode = PMU_I2C_MODE_SIMPLE; 700 break; 701 case pmac_i2c_mode_stdsub: 702 case pmac_i2c_mode_combined: 703 if (subsize != 1) 704 return -EINVAL; 705 hdr->address = addrdir & 0xfe; 706 hdr->comb_addr = addrdir; 707 hdr->sub_addr = subaddr; 708 if (bus->mode == pmac_i2c_mode_stdsub) 709 hdr->mode = PMU_I2C_MODE_STDSUB; 710 else 711 hdr->mode = PMU_I2C_MODE_COMBINED; 712 break; 713 default: 714 return -EINVAL; 715 } 716 717 reinit_completion(&comp); 718 req->data[0] = PMU_I2C_CMD; 719 req->reply[0] = 0xff; 720 req->nbytes = sizeof(struct pmu_i2c_hdr) + 1; 721 req->done = pmu_i2c_complete; 722 req->arg = ∁ 723 if (!read && len) { 724 memcpy(hdr->data, data, len); 725 req->nbytes += len; 726 } 727 rc = pmu_queue_request(req); 728 if (rc) 729 return rc; 730 wait_for_completion(&comp); 731 if (req->reply[0] == PMU_I2C_STATUS_OK) 732 break; 733 msleep(15); 734 } 735 if (req->reply[0] != PMU_I2C_STATUS_OK) 736 return -EIO; 737 738 for (retry = 0; retry < 16; retry++) { 739 memset(req, 0, sizeof(struct adb_request)); 740 741 /* I know that looks like a lot, slow as hell, but darwin 742 * does it so let's be on the safe side for now 743 */ 744 msleep(15); 745 746 hdr->bus = PMU_I2C_BUS_STATUS; 747 748 reinit_completion(&comp); 749 req->data[0] = PMU_I2C_CMD; 750 req->reply[0] = 0xff; 751 req->nbytes = 2; 752 req->done = pmu_i2c_complete; 753 req->arg = ∁ 754 rc = pmu_queue_request(req); 755 if (rc) 756 return rc; 757 wait_for_completion(&comp); 758 759 if (req->reply[0] == PMU_I2C_STATUS_OK && !read) 760 return 0; 761 if (req->reply[0] == PMU_I2C_STATUS_DATAREAD && read) { 762 int rlen = req->reply_len - 1; 763 764 if (rlen != len) { 765 printk(KERN_WARNING "low_i2c: PMU returned %d" 766 " bytes, expected %d !\n", rlen, len); 767 return -EIO; 768 } 769 if (len) 770 memcpy(data, &req->reply[1], len); 771 return 0; 772 } 773 } 774 return -EIO; 775 } 776 777 static void __init pmu_i2c_probe(void) 778 { 779 struct pmac_i2c_bus *bus; 780 struct device_node *busnode; 781 int channel, sz; 782 783 if (!pmu_present()) 784 return; 785 786 /* There might or might not be a "pmu-i2c" node, we use that 787 * or via-pmu itself, whatever we find. I haven't seen a machine 788 * with separate bus nodes, so we assume a multibus setup 789 */ 790 busnode = of_find_node_by_name(NULL, "pmu-i2c"); 791 if (busnode == NULL) 792 busnode = of_find_node_by_name(NULL, "via-pmu"); 793 if (busnode == NULL) 794 return; 795 796 printk(KERN_INFO "PMU i2c %pOF\n", busnode); 797 798 /* 799 * We add bus 1 and 2 only for now, bus 0 is "special" 800 */ 801 for (channel = 1; channel <= 2; channel++) { 802 sz = sizeof(struct pmac_i2c_bus) + sizeof(struct adb_request); 803 bus = kzalloc(sz, GFP_KERNEL); 804 if (bus == NULL) 805 return; 806 807 bus->controller = busnode; 808 bus->busnode = busnode; 809 bus->type = pmac_i2c_bus_pmu; 810 bus->channel = channel; 811 bus->mode = pmac_i2c_mode_std; 812 bus->hostdata = bus + 1; 813 bus->xfer = pmu_i2c_xfer; 814 mutex_init(&bus->mutex); 815 lockdep_register_key(&bus->lock_key); 816 lockdep_set_class(&bus->mutex, &bus->lock_key); 817 bus->flags = pmac_i2c_multibus; 818 list_add(&bus->link, &pmac_i2c_busses); 819 820 printk(KERN_INFO " channel %d bus <multibus>\n", channel); 821 } 822 } 823 824 #endif /* CONFIG_ADB_PMU */ 825 826 827 /* 828 * 829 * SMU implementation 830 * 831 */ 832 833 #ifdef CONFIG_PMAC_SMU 834 835 static void smu_i2c_complete(struct smu_i2c_cmd *cmd, void *misc) 836 { 837 complete(misc); 838 } 839 840 static int smu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, 841 u32 subaddr, u8 *data, int len) 842 { 843 struct smu_i2c_cmd *cmd = bus->hostdata; 844 struct completion comp; 845 int read = addrdir & 1; 846 int rc = 0; 847 848 if ((read && len > SMU_I2C_READ_MAX) || 849 ((!read) && len > SMU_I2C_WRITE_MAX)) 850 return -EINVAL; 851 852 memset(cmd, 0, sizeof(struct smu_i2c_cmd)); 853 cmd->info.bus = bus->channel; 854 cmd->info.devaddr = addrdir; 855 cmd->info.datalen = len; 856 857 switch(bus->mode) { 858 case pmac_i2c_mode_std: 859 if (subsize != 0) 860 return -EINVAL; 861 cmd->info.type = SMU_I2C_TRANSFER_SIMPLE; 862 break; 863 case pmac_i2c_mode_stdsub: 864 case pmac_i2c_mode_combined: 865 if (subsize > 3 || subsize < 1) 866 return -EINVAL; 867 cmd->info.sublen = subsize; 868 /* that's big-endian only but heh ! */ 869 memcpy(&cmd->info.subaddr, ((char *)&subaddr) + (4 - subsize), 870 subsize); 871 if (bus->mode == pmac_i2c_mode_stdsub) 872 cmd->info.type = SMU_I2C_TRANSFER_STDSUB; 873 else 874 cmd->info.type = SMU_I2C_TRANSFER_COMBINED; 875 break; 876 default: 877 return -EINVAL; 878 } 879 if (!read && len) 880 memcpy(cmd->info.data, data, len); 881 882 init_completion(&comp); 883 cmd->done = smu_i2c_complete; 884 cmd->misc = ∁ 885 rc = smu_queue_i2c(cmd); 886 if (rc < 0) 887 return rc; 888 wait_for_completion(&comp); 889 rc = cmd->status; 890 891 if (read && len) 892 memcpy(data, cmd->info.data, len); 893 return rc < 0 ? rc : 0; 894 } 895 896 static void __init smu_i2c_probe(void) 897 { 898 struct device_node *controller, *busnode; 899 struct pmac_i2c_bus *bus; 900 const u32 *reg; 901 int sz; 902 903 if (!smu_present()) 904 return; 905 906 controller = of_find_node_by_name(NULL, "smu-i2c-control"); 907 if (controller == NULL) 908 controller = of_find_node_by_name(NULL, "smu"); 909 if (controller == NULL) 910 return; 911 912 printk(KERN_INFO "SMU i2c %pOF\n", controller); 913 914 /* Look for childs, note that they might not be of the right 915 * type as older device trees mix i2c busses and other things 916 * at the same level 917 */ 918 for_each_child_of_node(controller, busnode) { 919 if (!of_node_is_type(busnode, "i2c") && 920 !of_node_is_type(busnode, "i2c-bus")) 921 continue; 922 reg = of_get_property(busnode, "reg", NULL); 923 if (reg == NULL) 924 continue; 925 926 sz = sizeof(struct pmac_i2c_bus) + sizeof(struct smu_i2c_cmd); 927 bus = kzalloc(sz, GFP_KERNEL); 928 if (bus == NULL) 929 return; 930 931 bus->controller = controller; 932 bus->busnode = of_node_get(busnode); 933 bus->type = pmac_i2c_bus_smu; 934 bus->channel = *reg; 935 bus->mode = pmac_i2c_mode_std; 936 bus->hostdata = bus + 1; 937 bus->xfer = smu_i2c_xfer; 938 mutex_init(&bus->mutex); 939 lockdep_register_key(&bus->lock_key); 940 lockdep_set_class(&bus->mutex, &bus->lock_key); 941 bus->flags = 0; 942 list_add(&bus->link, &pmac_i2c_busses); 943 944 printk(KERN_INFO " channel %x bus %pOF\n", 945 bus->channel, busnode); 946 } 947 } 948 949 #endif /* CONFIG_PMAC_SMU */ 950 951 /* 952 * 953 * Core code 954 * 955 */ 956 957 958 struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node) 959 { 960 struct device_node *p = of_node_get(node); 961 struct device_node *prev = NULL; 962 struct pmac_i2c_bus *bus; 963 964 while(p) { 965 list_for_each_entry(bus, &pmac_i2c_busses, link) { 966 if (p == bus->busnode) { 967 if (prev && bus->flags & pmac_i2c_multibus) { 968 const u32 *reg; 969 reg = of_get_property(prev, "reg", 970 NULL); 971 if (!reg) 972 continue; 973 if (((*reg) >> 8) != bus->channel) 974 continue; 975 } 976 of_node_put(p); 977 of_node_put(prev); 978 return bus; 979 } 980 } 981 of_node_put(prev); 982 prev = p; 983 p = of_get_parent(p); 984 } 985 return NULL; 986 } 987 EXPORT_SYMBOL_GPL(pmac_i2c_find_bus); 988 989 u8 pmac_i2c_get_dev_addr(struct device_node *device) 990 { 991 const u32 *reg = of_get_property(device, "reg", NULL); 992 993 if (reg == NULL) 994 return 0; 995 996 return (*reg) & 0xff; 997 } 998 EXPORT_SYMBOL_GPL(pmac_i2c_get_dev_addr); 999 1000 struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus) 1001 { 1002 return bus->controller; 1003 } 1004 EXPORT_SYMBOL_GPL(pmac_i2c_get_controller); 1005 1006 struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus) 1007 { 1008 return bus->busnode; 1009 } 1010 EXPORT_SYMBOL_GPL(pmac_i2c_get_bus_node); 1011 1012 int pmac_i2c_get_type(struct pmac_i2c_bus *bus) 1013 { 1014 return bus->type; 1015 } 1016 EXPORT_SYMBOL_GPL(pmac_i2c_get_type); 1017 1018 int pmac_i2c_get_flags(struct pmac_i2c_bus *bus) 1019 { 1020 return bus->flags; 1021 } 1022 EXPORT_SYMBOL_GPL(pmac_i2c_get_flags); 1023 1024 int pmac_i2c_get_channel(struct pmac_i2c_bus *bus) 1025 { 1026 return bus->channel; 1027 } 1028 EXPORT_SYMBOL_GPL(pmac_i2c_get_channel); 1029 1030 1031 struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus) 1032 { 1033 return &bus->adapter; 1034 } 1035 EXPORT_SYMBOL_GPL(pmac_i2c_get_adapter); 1036 1037 struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter) 1038 { 1039 struct pmac_i2c_bus *bus; 1040 1041 list_for_each_entry(bus, &pmac_i2c_busses, link) 1042 if (&bus->adapter == adapter) 1043 return bus; 1044 return NULL; 1045 } 1046 EXPORT_SYMBOL_GPL(pmac_i2c_adapter_to_bus); 1047 1048 int pmac_i2c_match_adapter(struct device_node *dev, struct i2c_adapter *adapter) 1049 { 1050 struct pmac_i2c_bus *bus = pmac_i2c_find_bus(dev); 1051 1052 if (bus == NULL) 1053 return 0; 1054 return (&bus->adapter == adapter); 1055 } 1056 EXPORT_SYMBOL_GPL(pmac_i2c_match_adapter); 1057 1058 int pmac_low_i2c_lock(struct device_node *np) 1059 { 1060 struct pmac_i2c_bus *bus, *found = NULL; 1061 1062 list_for_each_entry(bus, &pmac_i2c_busses, link) { 1063 if (np == bus->controller) { 1064 found = bus; 1065 break; 1066 } 1067 } 1068 if (!found) 1069 return -ENODEV; 1070 return pmac_i2c_open(bus, 0); 1071 } 1072 EXPORT_SYMBOL_GPL(pmac_low_i2c_lock); 1073 1074 int pmac_low_i2c_unlock(struct device_node *np) 1075 { 1076 struct pmac_i2c_bus *bus, *found = NULL; 1077 1078 list_for_each_entry(bus, &pmac_i2c_busses, link) { 1079 if (np == bus->controller) { 1080 found = bus; 1081 break; 1082 } 1083 } 1084 if (!found) 1085 return -ENODEV; 1086 pmac_i2c_close(bus); 1087 return 0; 1088 } 1089 EXPORT_SYMBOL_GPL(pmac_low_i2c_unlock); 1090 1091 1092 int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled) 1093 { 1094 int rc; 1095 1096 mutex_lock(&bus->mutex); 1097 bus->polled = polled || pmac_i2c_force_poll; 1098 bus->opened = 1; 1099 bus->mode = pmac_i2c_mode_std; 1100 if (bus->open && (rc = bus->open(bus)) != 0) { 1101 bus->opened = 0; 1102 mutex_unlock(&bus->mutex); 1103 return rc; 1104 } 1105 return 0; 1106 } 1107 EXPORT_SYMBOL_GPL(pmac_i2c_open); 1108 1109 void pmac_i2c_close(struct pmac_i2c_bus *bus) 1110 { 1111 WARN_ON(!bus->opened); 1112 if (bus->close) 1113 bus->close(bus); 1114 bus->opened = 0; 1115 mutex_unlock(&bus->mutex); 1116 } 1117 EXPORT_SYMBOL_GPL(pmac_i2c_close); 1118 1119 int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode) 1120 { 1121 WARN_ON(!bus->opened); 1122 1123 /* Report me if you see the error below as there might be a new 1124 * "combined4" mode that I need to implement for the SMU bus 1125 */ 1126 if (mode < pmac_i2c_mode_dumb || mode > pmac_i2c_mode_combined) { 1127 printk(KERN_ERR "low_i2c: Invalid mode %d requested on" 1128 " bus %pOF !\n", mode, bus->busnode); 1129 return -EINVAL; 1130 } 1131 bus->mode = mode; 1132 1133 return 0; 1134 } 1135 EXPORT_SYMBOL_GPL(pmac_i2c_setmode); 1136 1137 int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, 1138 u32 subaddr, u8 *data, int len) 1139 { 1140 int rc; 1141 1142 WARN_ON(!bus->opened); 1143 1144 DBG("xfer() chan=%d, addrdir=0x%x, mode=%d, subsize=%d, subaddr=0x%x," 1145 " %d bytes, bus %pOF\n", bus->channel, addrdir, bus->mode, subsize, 1146 subaddr, len, bus->busnode); 1147 1148 rc = bus->xfer(bus, addrdir, subsize, subaddr, data, len); 1149 1150 #ifdef DEBUG 1151 if (rc) 1152 DBG("xfer error %d\n", rc); 1153 #endif 1154 return rc; 1155 } 1156 EXPORT_SYMBOL_GPL(pmac_i2c_xfer); 1157 1158 /* some quirks for platform function decoding */ 1159 enum { 1160 pmac_i2c_quirk_invmask = 0x00000001u, 1161 pmac_i2c_quirk_skip = 0x00000002u, 1162 }; 1163 1164 static void pmac_i2c_devscan(void (*callback)(struct device_node *dev, 1165 int quirks)) 1166 { 1167 struct pmac_i2c_bus *bus; 1168 struct device_node *np; 1169 static struct whitelist_ent { 1170 char *name; 1171 char *compatible; 1172 int quirks; 1173 } whitelist[] = { 1174 /* XXX Study device-tree's & apple drivers are get the quirks 1175 * right ! 1176 */ 1177 /* Workaround: It seems that running the clockspreading 1178 * properties on the eMac will cause lockups during boot. 1179 * The machine seems to work fine without that. So for now, 1180 * let's make sure i2c-hwclock doesn't match about "imic" 1181 * clocks and we'll figure out if we really need to do 1182 * something special about those later. 1183 */ 1184 { "i2c-hwclock", "imic5002", pmac_i2c_quirk_skip }, 1185 { "i2c-hwclock", "imic5003", pmac_i2c_quirk_skip }, 1186 { "i2c-hwclock", NULL, pmac_i2c_quirk_invmask }, 1187 { "i2c-cpu-voltage", NULL, 0}, 1188 { "temp-monitor", NULL, 0 }, 1189 { "supply-monitor", NULL, 0 }, 1190 { NULL, NULL, 0 }, 1191 }; 1192 1193 /* Only some devices need to have platform functions instantiated 1194 * here. For now, we have a table. Others, like 9554 i2c GPIOs used 1195 * on Xserve, if we ever do a driver for them, will use their own 1196 * platform function instance 1197 */ 1198 list_for_each_entry(bus, &pmac_i2c_busses, link) { 1199 for_each_child_of_node(bus->busnode, np) { 1200 struct whitelist_ent *p; 1201 /* If multibus, check if device is on that bus */ 1202 if (bus->flags & pmac_i2c_multibus) 1203 if (bus != pmac_i2c_find_bus(np)) 1204 continue; 1205 for (p = whitelist; p->name != NULL; p++) { 1206 if (!of_node_name_eq(np, p->name)) 1207 continue; 1208 if (p->compatible && 1209 !of_device_is_compatible(np, p->compatible)) 1210 continue; 1211 if (p->quirks & pmac_i2c_quirk_skip) 1212 break; 1213 callback(np, p->quirks); 1214 break; 1215 } 1216 } 1217 } 1218 } 1219 1220 #define MAX_I2C_DATA 64 1221 1222 struct pmac_i2c_pf_inst 1223 { 1224 struct pmac_i2c_bus *bus; 1225 u8 addr; 1226 u8 buffer[MAX_I2C_DATA]; 1227 u8 scratch[MAX_I2C_DATA]; 1228 int bytes; 1229 int quirks; 1230 }; 1231 1232 static void* pmac_i2c_do_begin(struct pmf_function *func, struct pmf_args *args) 1233 { 1234 struct pmac_i2c_pf_inst *inst; 1235 struct pmac_i2c_bus *bus; 1236 1237 bus = pmac_i2c_find_bus(func->node); 1238 if (bus == NULL) { 1239 printk(KERN_ERR "low_i2c: Can't find bus for %pOF (pfunc)\n", 1240 func->node); 1241 return NULL; 1242 } 1243 if (pmac_i2c_open(bus, 0)) { 1244 printk(KERN_ERR "low_i2c: Can't open i2c bus for %pOF (pfunc)\n", 1245 func->node); 1246 return NULL; 1247 } 1248 1249 /* XXX might need GFP_ATOMIC when called during the suspend process, 1250 * but then, there are already lots of issues with suspending when 1251 * near OOM that need to be resolved, the allocator itself should 1252 * probably make GFP_NOIO implicit during suspend 1253 */ 1254 inst = kzalloc(sizeof(struct pmac_i2c_pf_inst), GFP_KERNEL); 1255 if (inst == NULL) { 1256 pmac_i2c_close(bus); 1257 return NULL; 1258 } 1259 inst->bus = bus; 1260 inst->addr = pmac_i2c_get_dev_addr(func->node); 1261 inst->quirks = (int)(long)func->driver_data; 1262 return inst; 1263 } 1264 1265 static void pmac_i2c_do_end(struct pmf_function *func, void *instdata) 1266 { 1267 struct pmac_i2c_pf_inst *inst = instdata; 1268 1269 if (inst == NULL) 1270 return; 1271 pmac_i2c_close(inst->bus); 1272 kfree(inst); 1273 } 1274 1275 static int pmac_i2c_do_read(PMF_STD_ARGS, u32 len) 1276 { 1277 struct pmac_i2c_pf_inst *inst = instdata; 1278 1279 inst->bytes = len; 1280 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 0, 0, 1281 inst->buffer, len); 1282 } 1283 1284 static int pmac_i2c_do_write(PMF_STD_ARGS, u32 len, const u8 *data) 1285 { 1286 struct pmac_i2c_pf_inst *inst = instdata; 1287 1288 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0, 1289 (u8 *)data, len); 1290 } 1291 1292 /* This function is used to do the masking & OR'ing for the "rmw" type 1293 * callbacks. Ze should apply the mask and OR in the values in the 1294 * buffer before writing back. The problem is that it seems that 1295 * various darwin drivers implement the mask/or differently, thus 1296 * we need to check the quirks first 1297 */ 1298 static void pmac_i2c_do_apply_rmw(struct pmac_i2c_pf_inst *inst, 1299 u32 len, const u8 *mask, const u8 *val) 1300 { 1301 int i; 1302 1303 if (inst->quirks & pmac_i2c_quirk_invmask) { 1304 for (i = 0; i < len; i ++) 1305 inst->scratch[i] = (inst->buffer[i] & mask[i]) | val[i]; 1306 } else { 1307 for (i = 0; i < len; i ++) 1308 inst->scratch[i] = (inst->buffer[i] & ~mask[i]) 1309 | (val[i] & mask[i]); 1310 } 1311 } 1312 1313 static int pmac_i2c_do_rmw(PMF_STD_ARGS, u32 masklen, u32 valuelen, 1314 u32 totallen, const u8 *maskdata, 1315 const u8 *valuedata) 1316 { 1317 struct pmac_i2c_pf_inst *inst = instdata; 1318 1319 if (masklen > inst->bytes || valuelen > inst->bytes || 1320 totallen > inst->bytes || valuelen > masklen) 1321 return -EINVAL; 1322 1323 pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata); 1324 1325 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0, 1326 inst->scratch, totallen); 1327 } 1328 1329 static int pmac_i2c_do_read_sub(PMF_STD_ARGS, u8 subaddr, u32 len) 1330 { 1331 struct pmac_i2c_pf_inst *inst = instdata; 1332 1333 inst->bytes = len; 1334 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 1, subaddr, 1335 inst->buffer, len); 1336 } 1337 1338 static int pmac_i2c_do_write_sub(PMF_STD_ARGS, u8 subaddr, u32 len, 1339 const u8 *data) 1340 { 1341 struct pmac_i2c_pf_inst *inst = instdata; 1342 1343 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1, 1344 subaddr, (u8 *)data, len); 1345 } 1346 1347 static int pmac_i2c_do_set_mode(PMF_STD_ARGS, int mode) 1348 { 1349 struct pmac_i2c_pf_inst *inst = instdata; 1350 1351 return pmac_i2c_setmode(inst->bus, mode); 1352 } 1353 1354 static int pmac_i2c_do_rmw_sub(PMF_STD_ARGS, u8 subaddr, u32 masklen, 1355 u32 valuelen, u32 totallen, const u8 *maskdata, 1356 const u8 *valuedata) 1357 { 1358 struct pmac_i2c_pf_inst *inst = instdata; 1359 1360 if (masklen > inst->bytes || valuelen > inst->bytes || 1361 totallen > inst->bytes || valuelen > masklen) 1362 return -EINVAL; 1363 1364 pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata); 1365 1366 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1, 1367 subaddr, inst->scratch, totallen); 1368 } 1369 1370 static int pmac_i2c_do_mask_and_comp(PMF_STD_ARGS, u32 len, 1371 const u8 *maskdata, 1372 const u8 *valuedata) 1373 { 1374 struct pmac_i2c_pf_inst *inst = instdata; 1375 int i, match; 1376 1377 /* Get return value pointer, it's assumed to be a u32 */ 1378 if (!args || !args->count || !args->u[0].p) 1379 return -EINVAL; 1380 1381 /* Check buffer */ 1382 if (len > inst->bytes) 1383 return -EINVAL; 1384 1385 for (i = 0, match = 1; match && i < len; i ++) 1386 if ((inst->buffer[i] & maskdata[i]) != valuedata[i]) 1387 match = 0; 1388 *args->u[0].p = match; 1389 return 0; 1390 } 1391 1392 static int pmac_i2c_do_delay(PMF_STD_ARGS, u32 duration) 1393 { 1394 msleep((duration + 999) / 1000); 1395 return 0; 1396 } 1397 1398 1399 static struct pmf_handlers pmac_i2c_pfunc_handlers = { 1400 .begin = pmac_i2c_do_begin, 1401 .end = pmac_i2c_do_end, 1402 .read_i2c = pmac_i2c_do_read, 1403 .write_i2c = pmac_i2c_do_write, 1404 .rmw_i2c = pmac_i2c_do_rmw, 1405 .read_i2c_sub = pmac_i2c_do_read_sub, 1406 .write_i2c_sub = pmac_i2c_do_write_sub, 1407 .rmw_i2c_sub = pmac_i2c_do_rmw_sub, 1408 .set_i2c_mode = pmac_i2c_do_set_mode, 1409 .mask_and_compare = pmac_i2c_do_mask_and_comp, 1410 .delay = pmac_i2c_do_delay, 1411 }; 1412 1413 static void __init pmac_i2c_dev_create(struct device_node *np, int quirks) 1414 { 1415 DBG("dev_create(%pOF)\n", np); 1416 1417 pmf_register_driver(np, &pmac_i2c_pfunc_handlers, 1418 (void *)(long)quirks); 1419 } 1420 1421 static void __init pmac_i2c_dev_init(struct device_node *np, int quirks) 1422 { 1423 DBG("dev_create(%pOF)\n", np); 1424 1425 pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_INIT, NULL); 1426 } 1427 1428 static void pmac_i2c_dev_suspend(struct device_node *np, int quirks) 1429 { 1430 DBG("dev_suspend(%pOF)\n", np); 1431 pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_SLEEP, NULL); 1432 } 1433 1434 static void pmac_i2c_dev_resume(struct device_node *np, int quirks) 1435 { 1436 DBG("dev_resume(%pOF)\n", np); 1437 pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_WAKE, NULL); 1438 } 1439 1440 void pmac_pfunc_i2c_suspend(void) 1441 { 1442 pmac_i2c_devscan(pmac_i2c_dev_suspend); 1443 } 1444 1445 void pmac_pfunc_i2c_resume(void) 1446 { 1447 pmac_i2c_devscan(pmac_i2c_dev_resume); 1448 } 1449 1450 /* 1451 * Initialize us: probe all i2c busses on the machine, instantiate 1452 * busses and platform functions as needed. 1453 */ 1454 /* This is non-static as it might be called early by smp code */ 1455 int __init pmac_i2c_init(void) 1456 { 1457 static int i2c_inited; 1458 1459 if (i2c_inited) 1460 return 0; 1461 i2c_inited = 1; 1462 1463 /* Probe keywest-i2c busses */ 1464 kw_i2c_probe(); 1465 1466 #ifdef CONFIG_ADB_PMU 1467 /* Probe PMU i2c busses */ 1468 pmu_i2c_probe(); 1469 #endif 1470 1471 #ifdef CONFIG_PMAC_SMU 1472 /* Probe SMU i2c busses */ 1473 smu_i2c_probe(); 1474 #endif 1475 1476 /* Now add platform functions for some known devices */ 1477 pmac_i2c_devscan(pmac_i2c_dev_create); 1478 1479 return 0; 1480 } 1481 machine_arch_initcall(powermac, pmac_i2c_init); 1482 1483 /* Since pmac_i2c_init can be called too early for the platform device 1484 * registration, we need to do it at a later time. In our case, subsys 1485 * happens to fit well, though I agree it's a bit of a hack... 1486 */ 1487 static int __init pmac_i2c_create_platform_devices(void) 1488 { 1489 struct pmac_i2c_bus *bus; 1490 int i = 0; 1491 1492 /* In the case where we are initialized from smp_init(), we must 1493 * not use the timer (and thus the irq). It's safe from now on 1494 * though 1495 */ 1496 pmac_i2c_force_poll = 0; 1497 1498 /* Create platform devices */ 1499 list_for_each_entry(bus, &pmac_i2c_busses, link) { 1500 bus->platform_dev = 1501 platform_device_alloc("i2c-powermac", i++); 1502 if (bus->platform_dev == NULL) 1503 return -ENOMEM; 1504 bus->platform_dev->dev.platform_data = bus; 1505 bus->platform_dev->dev.of_node = bus->busnode; 1506 platform_device_add(bus->platform_dev); 1507 } 1508 1509 /* Now call platform "init" functions */ 1510 pmac_i2c_devscan(pmac_i2c_dev_init); 1511 1512 return 0; 1513 } 1514 machine_subsys_initcall(powermac, pmac_i2c_create_platform_devices); 1515