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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/export.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 <linux/i2c.h>
46#include <linux/slab.h>
47#include <asm/keylargo.h>
48#include <asm/uninorth.h>
49#include <asm/io.h>
50#include <asm/prom.h>
51#include <asm/machdep.h>
52#include <asm/smu.h>
53#include <asm/pmac_pfunc.h>
54#include <asm/pmac_low_i2c.h>
55
56#ifdef DEBUG
57#define DBG(x...) do {\
58 printk(KERN_DEBUG "low_i2c:" x); \
59 } while(0)
60#else
61#define DBG(x...)
62#endif
63
64#ifdef DEBUG_LOW
65#define DBG_LOW(x...) do {\
66 printk(KERN_DEBUG "low_i2c:" x); \
67 } while(0)
68#else
69#define DBG_LOW(x...)
70#endif
71
72
73static int pmac_i2c_force_poll = 1;
74
75
76
77
78struct pmac_i2c_bus
79{
80 struct list_head link;
81 struct device_node *controller;
82 struct device_node *busnode;
83 int type;
84 int flags;
85 struct i2c_adapter adapter;
86 void *hostdata;
87 int channel;
88 int mode;
89 struct mutex mutex;
90 int opened;
91 int polled;
92 struct platform_device *platform_dev;
93 struct lock_class_key lock_key;
94
95
96 int (*open)(struct pmac_i2c_bus *bus);
97 void (*close)(struct pmac_i2c_bus *bus);
98 int (*xfer)(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
99 u32 subaddr, u8 *data, int len);
100};
101
102static LIST_HEAD(pmac_i2c_busses);
103
104
105
106
107
108struct pmac_i2c_host_kw
109{
110 struct mutex mutex;
111
112 void __iomem *base;
113 int bsteps;
114 int speed;
115 int irq;
116 u8 *data;
117 unsigned len;
118 int state;
119 int rw;
120 int polled;
121 int result;
122 struct completion complete;
123 spinlock_t lock;
124 struct timer_list timeout_timer;
125};
126
127
128typedef enum {
129 reg_mode = 0,
130 reg_control,
131 reg_status,
132 reg_isr,
133 reg_ier,
134 reg_addr,
135 reg_subaddr,
136 reg_data
137} reg_t;
138
139
140#define KW_POLL_TIMEOUT (2*HZ)
141
142
143#define KW_I2C_MODE_100KHZ 0x00
144#define KW_I2C_MODE_50KHZ 0x01
145#define KW_I2C_MODE_25KHZ 0x02
146#define KW_I2C_MODE_DUMB 0x00
147#define KW_I2C_MODE_STANDARD 0x04
148#define KW_I2C_MODE_STANDARDSUB 0x08
149#define KW_I2C_MODE_COMBINED 0x0C
150#define KW_I2C_MODE_MODE_MASK 0x0C
151#define KW_I2C_MODE_CHAN_MASK 0xF0
152
153
154#define KW_I2C_CTL_AAK 0x01
155#define KW_I2C_CTL_XADDR 0x02
156#define KW_I2C_CTL_STOP 0x04
157#define KW_I2C_CTL_START 0x08
158
159
160#define KW_I2C_STAT_BUSY 0x01
161#define KW_I2C_STAT_LAST_AAK 0x02
162#define KW_I2C_STAT_LAST_RW 0x04
163#define KW_I2C_STAT_SDA 0x08
164#define KW_I2C_STAT_SCL 0x10
165
166
167#define KW_I2C_IRQ_DATA 0x01
168#define KW_I2C_IRQ_ADDR 0x02
169#define KW_I2C_IRQ_STOP 0x04
170#define KW_I2C_IRQ_START 0x08
171#define KW_I2C_IRQ_MASK 0x0F
172
173
174enum {
175 state_idle,
176 state_addr,
177 state_read,
178 state_write,
179 state_stop,
180 state_dead
181};
182
183#define WRONG_STATE(name) do {\
184 printk(KERN_DEBUG "KW: wrong state. Got %s, state: %s " \
185 "(isr: %02x)\n", \
186 name, __kw_state_names[host->state], isr); \
187 } while(0)
188
189static const char *__kw_state_names[] = {
190 "state_idle",
191 "state_addr",
192 "state_read",
193 "state_write",
194 "state_stop",
195 "state_dead"
196};
197
198static inline u8 __kw_read_reg(struct pmac_i2c_host_kw *host, reg_t reg)
199{
200 return readb(host->base + (((unsigned int)reg) << host->bsteps));
201}
202
203static inline void __kw_write_reg(struct pmac_i2c_host_kw *host,
204 reg_t reg, u8 val)
205{
206 writeb(val, host->base + (((unsigned)reg) << host->bsteps));
207 (void)__kw_read_reg(host, reg_subaddr);
208}
209
210#define kw_write_reg(reg, val) __kw_write_reg(host, reg, val)
211#define kw_read_reg(reg) __kw_read_reg(host, reg)
212
213static u8 kw_i2c_wait_interrupt(struct pmac_i2c_host_kw *host)
214{
215 int i, j;
216 u8 isr;
217
218 for (i = 0; i < 1000; i++) {
219 isr = kw_read_reg(reg_isr) & KW_I2C_IRQ_MASK;
220 if (isr != 0)
221 return isr;
222
223
224
225
226
227 if (host->polled) {
228 for (j = 1; j < 100000; j++)
229 mb();
230 } else
231 msleep(1);
232 }
233 return isr;
234}
235
236static void kw_i2c_do_stop(struct pmac_i2c_host_kw *host, int result)
237{
238 kw_write_reg(reg_control, KW_I2C_CTL_STOP);
239 host->state = state_stop;
240 host->result = result;
241}
242
243
244static void kw_i2c_handle_interrupt(struct pmac_i2c_host_kw *host, u8 isr)
245{
246 u8 ack;
247
248 DBG_LOW("kw_handle_interrupt(%s, isr: %x)\n",
249 __kw_state_names[host->state], isr);
250
251 if (host->state == state_idle) {
252 printk(KERN_WARNING "low_i2c: Keywest got an out of state"
253 " interrupt, ignoring\n");
254 kw_write_reg(reg_isr, isr);
255 return;
256 }
257
258 if (isr == 0) {
259 printk(KERN_WARNING "low_i2c: Timeout in i2c transfer"
260 " on keywest !\n");
261 if (host->state != state_stop) {
262 kw_i2c_do_stop(host, -EIO);
263 return;
264 }
265 ack = kw_read_reg(reg_status);
266 if (ack & KW_I2C_STAT_BUSY)
267 kw_write_reg(reg_status, 0);
268 host->state = state_idle;
269 kw_write_reg(reg_ier, 0x00);
270 if (!host->polled)
271 complete(&host->complete);
272 return;
273 }
274
275 if (isr & KW_I2C_IRQ_ADDR) {
276 ack = kw_read_reg(reg_status);
277 if (host->state != state_addr) {
278 WRONG_STATE("KW_I2C_IRQ_ADDR");
279 kw_i2c_do_stop(host, -EIO);
280 }
281 if ((ack & KW_I2C_STAT_LAST_AAK) == 0) {
282 host->result = -ENXIO;
283 host->state = state_stop;
284 DBG_LOW("KW: NAK on address\n");
285 } else {
286 if (host->len == 0)
287 kw_i2c_do_stop(host, 0);
288 else if (host->rw) {
289 host->state = state_read;
290 if (host->len > 1)
291 kw_write_reg(reg_control,
292 KW_I2C_CTL_AAK);
293 } else {
294 host->state = state_write;
295 kw_write_reg(reg_data, *(host->data++));
296 host->len--;
297 }
298 }
299 kw_write_reg(reg_isr, KW_I2C_IRQ_ADDR);
300 }
301
302 if (isr & KW_I2C_IRQ_DATA) {
303 if (host->state == state_read) {
304 *(host->data++) = kw_read_reg(reg_data);
305 host->len--;
306 kw_write_reg(reg_isr, KW_I2C_IRQ_DATA);
307 if (host->len == 0)
308 host->state = state_stop;
309 else if (host->len == 1)
310 kw_write_reg(reg_control, 0);
311 } else if (host->state == state_write) {
312 ack = kw_read_reg(reg_status);
313 if ((ack & KW_I2C_STAT_LAST_AAK) == 0) {
314 DBG_LOW("KW: nack on data write\n");
315 host->result = -EFBIG;
316 host->state = state_stop;
317 } else if (host->len) {
318 kw_write_reg(reg_data, *(host->data++));
319 host->len--;
320 } else
321 kw_i2c_do_stop(host, 0);
322 } else {
323 WRONG_STATE("KW_I2C_IRQ_DATA");
324 if (host->state != state_stop)
325 kw_i2c_do_stop(host, -EIO);
326 }
327 kw_write_reg(reg_isr, KW_I2C_IRQ_DATA);
328 }
329
330 if (isr & KW_I2C_IRQ_STOP) {
331 kw_write_reg(reg_isr, KW_I2C_IRQ_STOP);
332 if (host->state != state_stop) {
333 WRONG_STATE("KW_I2C_IRQ_STOP");
334 host->result = -EIO;
335 }
336 host->state = state_idle;
337 if (!host->polled)
338 complete(&host->complete);
339 }
340
341
342 if (isr & KW_I2C_IRQ_START)
343 kw_write_reg(reg_isr, KW_I2C_IRQ_START);
344
345}
346
347
348static irqreturn_t kw_i2c_irq(int irq, void *dev_id)
349{
350 struct pmac_i2c_host_kw *host = dev_id;
351 unsigned long flags;
352
353 spin_lock_irqsave(&host->lock, flags);
354 del_timer(&host->timeout_timer);
355 kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr));
356 if (host->state != state_idle) {
357 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT;
358 add_timer(&host->timeout_timer);
359 }
360 spin_unlock_irqrestore(&host->lock, flags);
361 return IRQ_HANDLED;
362}
363
364static void kw_i2c_timeout(struct timer_list *t)
365{
366 struct pmac_i2c_host_kw *host = from_timer(host, t, timeout_timer);
367 unsigned long flags;
368
369 spin_lock_irqsave(&host->lock, flags);
370
371
372
373
374
375 if (timer_pending(&host->timeout_timer))
376 goto skip;
377
378 kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr));
379 if (host->state != state_idle) {
380 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT;
381 add_timer(&host->timeout_timer);
382 }
383 skip:
384 spin_unlock_irqrestore(&host->lock, flags);
385}
386
387static int kw_i2c_open(struct pmac_i2c_bus *bus)
388{
389 struct pmac_i2c_host_kw *host = bus->hostdata;
390 mutex_lock(&host->mutex);
391 return 0;
392}
393
394static void kw_i2c_close(struct pmac_i2c_bus *bus)
395{
396 struct pmac_i2c_host_kw *host = bus->hostdata;
397 mutex_unlock(&host->mutex);
398}
399
400static int kw_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
401 u32 subaddr, u8 *data, int len)
402{
403 struct pmac_i2c_host_kw *host = bus->hostdata;
404 u8 mode_reg = host->speed;
405 int use_irq = host->irq && !bus->polled;
406
407
408 switch(bus->mode) {
409 case pmac_i2c_mode_dumb:
410 return -EINVAL;
411 case pmac_i2c_mode_std:
412 mode_reg |= KW_I2C_MODE_STANDARD;
413 if (subsize != 0)
414 return -EINVAL;
415 break;
416 case pmac_i2c_mode_stdsub:
417 mode_reg |= KW_I2C_MODE_STANDARDSUB;
418 if (subsize != 1)
419 return -EINVAL;
420 break;
421 case pmac_i2c_mode_combined:
422 mode_reg |= KW_I2C_MODE_COMBINED;
423 if (subsize != 1)
424 return -EINVAL;
425 break;
426 }
427
428
429 kw_write_reg(reg_isr, kw_read_reg(reg_isr));
430 kw_write_reg(reg_mode, mode_reg | (bus->channel << 4));
431 kw_write_reg(reg_status, 0);
432
433
434
435
436 kw_write_reg(reg_addr, addrdir & 0xff);
437
438
439 if ((mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_STANDARDSUB
440 || (mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_COMBINED)
441 kw_write_reg(reg_subaddr, subaddr);
442
443
444 host->data = data;
445 host->len = len;
446 host->state = state_addr;
447 host->result = 0;
448 host->rw = (addrdir & 1);
449 host->polled = bus->polled;
450
451
452
453
454 if (use_irq) {
455
456 reinit_completion(&host->complete);
457
458 kw_write_reg(reg_isr, kw_read_reg(reg_isr));
459
460 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT;
461 add_timer(&host->timeout_timer);
462
463 kw_write_reg(reg_ier, KW_I2C_IRQ_MASK);
464 }
465
466
467 kw_write_reg(reg_control, KW_I2C_CTL_XADDR);
468
469
470 if (use_irq)
471 wait_for_completion(&host->complete);
472 else {
473 while(host->state != state_idle) {
474 unsigned long flags;
475
476 u8 isr = kw_i2c_wait_interrupt(host);
477 spin_lock_irqsave(&host->lock, flags);
478 kw_i2c_handle_interrupt(host, isr);
479 spin_unlock_irqrestore(&host->lock, flags);
480 }
481 }
482
483
484 kw_write_reg(reg_ier, 0);
485
486 return host->result;
487}
488
489static struct pmac_i2c_host_kw *__init kw_i2c_host_init(struct device_node *np)
490{
491 struct pmac_i2c_host_kw *host;
492 const u32 *psteps, *prate, *addrp;
493 u32 steps;
494
495 host = kzalloc(sizeof(*host), GFP_KERNEL);
496 if (host == NULL) {
497 printk(KERN_ERR "low_i2c: Can't allocate host for %pOF\n",
498 np);
499 return NULL;
500 }
501
502
503
504
505
506 addrp = of_get_property(np, "AAPL,address", NULL);
507 if (addrp == NULL) {
508 printk(KERN_ERR "low_i2c: Can't find address for %pOF\n",
509 np);
510 kfree(host);
511 return NULL;
512 }
513 mutex_init(&host->mutex);
514 init_completion(&host->complete);
515 spin_lock_init(&host->lock);
516 timer_setup(&host->timeout_timer, kw_i2c_timeout, 0);
517
518 psteps = of_get_property(np, "AAPL,address-step", NULL);
519 steps = psteps ? (*psteps) : 0x10;
520 for (host->bsteps = 0; (steps & 0x01) == 0; host->bsteps++)
521 steps >>= 1;
522
523 host->speed = KW_I2C_MODE_25KHZ;
524 prate = of_get_property(np, "AAPL,i2c-rate", NULL);
525 if (prate) switch(*prate) {
526 case 100:
527 host->speed = KW_I2C_MODE_100KHZ;
528 break;
529 case 50:
530 host->speed = KW_I2C_MODE_50KHZ;
531 break;
532 case 25:
533 host->speed = KW_I2C_MODE_25KHZ;
534 break;
535 }
536 host->irq = irq_of_parse_and_map(np, 0);
537 if (!host->irq)
538 printk(KERN_WARNING
539 "low_i2c: Failed to map interrupt for %pOF\n",
540 np);
541
542 host->base = ioremap((*addrp), 0x1000);
543 if (host->base == NULL) {
544 printk(KERN_ERR "low_i2c: Can't map registers for %pOF\n",
545 np);
546 kfree(host);
547 return NULL;
548 }
549
550
551 kw_write_reg(reg_ier, 0);
552
553
554
555
556
557 if (request_irq(host->irq, kw_i2c_irq, IRQF_NO_SUSPEND,
558 "keywest i2c", host))
559 host->irq = 0;
560
561 printk(KERN_INFO "KeyWest i2c @0x%08x irq %d %pOF\n",
562 *addrp, host->irq, np);
563
564 return host;
565}
566
567
568static void __init kw_i2c_add(struct pmac_i2c_host_kw *host,
569 struct device_node *controller,
570 struct device_node *busnode,
571 int channel)
572{
573 struct pmac_i2c_bus *bus;
574
575 bus = kzalloc(sizeof(struct pmac_i2c_bus), GFP_KERNEL);
576 if (bus == NULL)
577 return;
578
579 bus->controller = of_node_get(controller);
580 bus->busnode = of_node_get(busnode);
581 bus->type = pmac_i2c_bus_keywest;
582 bus->hostdata = host;
583 bus->channel = channel;
584 bus->mode = pmac_i2c_mode_std;
585 bus->open = kw_i2c_open;
586 bus->close = kw_i2c_close;
587 bus->xfer = kw_i2c_xfer;
588 mutex_init(&bus->mutex);
589 lockdep_set_class(&bus->mutex, &bus->lock_key);
590 if (controller == busnode)
591 bus->flags = pmac_i2c_multibus;
592 list_add(&bus->link, &pmac_i2c_busses);
593
594 printk(KERN_INFO " channel %d bus %s\n", channel,
595 (controller == busnode) ? "<multibus>" : busnode->full_name);
596}
597
598static void __init kw_i2c_probe(void)
599{
600 struct device_node *np, *child, *parent;
601
602
603 for_each_compatible_node(np, "i2c","keywest-i2c") {
604 struct pmac_i2c_host_kw *host;
605 int multibus;
606
607
608 host = kw_i2c_host_init(np);
609 if (host == NULL)
610 continue;
611
612
613
614
615
616
617
618
619 child = of_get_next_child(np, NULL);
620 multibus = !child || strcmp(child->name, "i2c-bus");
621 of_node_put(child);
622
623
624
625
626 if (multibus) {
627 int chans, i;
628
629 parent = of_get_parent(np);
630 if (parent == NULL)
631 continue;
632 chans = parent->name[0] == 'u' ? 2 : 1;
633 for (i = 0; i < chans; i++)
634 kw_i2c_add(host, np, np, i);
635 } else {
636 for (child = NULL;
637 (child = of_get_next_child(np, child)) != NULL;) {
638 const u32 *reg = of_get_property(child,
639 "reg", NULL);
640 if (reg == NULL)
641 continue;
642 kw_i2c_add(host, np, child, *reg);
643 }
644 }
645 }
646}
647
648
649
650
651
652
653
654
655#ifdef CONFIG_ADB_PMU
656
657
658
659
660struct pmu_i2c_hdr {
661 u8 bus;
662 u8 mode;
663 u8 bus2;
664 u8 address;
665 u8 sub_addr;
666 u8 comb_addr;
667 u8 count;
668 u8 data[];
669};
670
671static void pmu_i2c_complete(struct adb_request *req)
672{
673 complete(req->arg);
674}
675
676static int pmu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
677 u32 subaddr, u8 *data, int len)
678{
679 struct adb_request *req = bus->hostdata;
680 struct pmu_i2c_hdr *hdr = (struct pmu_i2c_hdr *)&req->data[1];
681 struct completion comp;
682 int read = addrdir & 1;
683 int retry;
684 int rc = 0;
685
686
687 if (len > 16)
688 return -EINVAL;
689
690 init_completion(&comp);
691
692 for (retry = 0; retry < 16; retry++) {
693 memset(req, 0, sizeof(struct adb_request));
694 hdr->bus = bus->channel;
695 hdr->count = len;
696
697 switch(bus->mode) {
698 case pmac_i2c_mode_std:
699 if (subsize != 0)
700 return -EINVAL;
701 hdr->address = addrdir;
702 hdr->mode = PMU_I2C_MODE_SIMPLE;
703 break;
704 case pmac_i2c_mode_stdsub:
705 case pmac_i2c_mode_combined:
706 if (subsize != 1)
707 return -EINVAL;
708 hdr->address = addrdir & 0xfe;
709 hdr->comb_addr = addrdir;
710 hdr->sub_addr = subaddr;
711 if (bus->mode == pmac_i2c_mode_stdsub)
712 hdr->mode = PMU_I2C_MODE_STDSUB;
713 else
714 hdr->mode = PMU_I2C_MODE_COMBINED;
715 break;
716 default:
717 return -EINVAL;
718 }
719
720 reinit_completion(&comp);
721 req->data[0] = PMU_I2C_CMD;
722 req->reply[0] = 0xff;
723 req->nbytes = sizeof(struct pmu_i2c_hdr) + 1;
724 req->done = pmu_i2c_complete;
725 req->arg = ∁
726 if (!read && len) {
727 memcpy(hdr->data, data, len);
728 req->nbytes += len;
729 }
730 rc = pmu_queue_request(req);
731 if (rc)
732 return rc;
733 wait_for_completion(&comp);
734 if (req->reply[0] == PMU_I2C_STATUS_OK)
735 break;
736 msleep(15);
737 }
738 if (req->reply[0] != PMU_I2C_STATUS_OK)
739 return -EIO;
740
741 for (retry = 0; retry < 16; retry++) {
742 memset(req, 0, sizeof(struct adb_request));
743
744
745
746
747 msleep(15);
748
749 hdr->bus = PMU_I2C_BUS_STATUS;
750
751 reinit_completion(&comp);
752 req->data[0] = PMU_I2C_CMD;
753 req->reply[0] = 0xff;
754 req->nbytes = 2;
755 req->done = pmu_i2c_complete;
756 req->arg = ∁
757 rc = pmu_queue_request(req);
758 if (rc)
759 return rc;
760 wait_for_completion(&comp);
761
762 if (req->reply[0] == PMU_I2C_STATUS_OK && !read)
763 return 0;
764 if (req->reply[0] == PMU_I2C_STATUS_DATAREAD && read) {
765 int rlen = req->reply_len - 1;
766
767 if (rlen != len) {
768 printk(KERN_WARNING "low_i2c: PMU returned %d"
769 " bytes, expected %d !\n", rlen, len);
770 return -EIO;
771 }
772 if (len)
773 memcpy(data, &req->reply[1], len);
774 return 0;
775 }
776 }
777 return -EIO;
778}
779
780static void __init pmu_i2c_probe(void)
781{
782 struct pmac_i2c_bus *bus;
783 struct device_node *busnode;
784 int channel, sz;
785
786 if (!pmu_present())
787 return;
788
789
790
791
792
793 busnode = of_find_node_by_name(NULL, "pmu-i2c");
794 if (busnode == NULL)
795 busnode = of_find_node_by_name(NULL, "via-pmu");
796 if (busnode == NULL)
797 return;
798
799 printk(KERN_INFO "PMU i2c %pOF\n", busnode);
800
801
802
803
804 for (channel = 1; channel <= 2; channel++) {
805 sz = sizeof(struct pmac_i2c_bus) + sizeof(struct adb_request);
806 bus = kzalloc(sz, GFP_KERNEL);
807 if (bus == NULL)
808 return;
809
810 bus->controller = busnode;
811 bus->busnode = busnode;
812 bus->type = pmac_i2c_bus_pmu;
813 bus->channel = channel;
814 bus->mode = pmac_i2c_mode_std;
815 bus->hostdata = bus + 1;
816 bus->xfer = pmu_i2c_xfer;
817 mutex_init(&bus->mutex);
818 lockdep_set_class(&bus->mutex, &bus->lock_key);
819 bus->flags = pmac_i2c_multibus;
820 list_add(&bus->link, &pmac_i2c_busses);
821
822 printk(KERN_INFO " channel %d bus <multibus>\n", channel);
823 }
824}
825
826#endif
827
828
829
830
831
832
833
834
835#ifdef CONFIG_PMAC_SMU
836
837static void smu_i2c_complete(struct smu_i2c_cmd *cmd, void *misc)
838{
839 complete(misc);
840}
841
842static int smu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
843 u32 subaddr, u8 *data, int len)
844{
845 struct smu_i2c_cmd *cmd = bus->hostdata;
846 struct completion comp;
847 int read = addrdir & 1;
848 int rc = 0;
849
850 if ((read && len > SMU_I2C_READ_MAX) ||
851 ((!read) && len > SMU_I2C_WRITE_MAX))
852 return -EINVAL;
853
854 memset(cmd, 0, sizeof(struct smu_i2c_cmd));
855 cmd->info.bus = bus->channel;
856 cmd->info.devaddr = addrdir;
857 cmd->info.datalen = len;
858
859 switch(bus->mode) {
860 case pmac_i2c_mode_std:
861 if (subsize != 0)
862 return -EINVAL;
863 cmd->info.type = SMU_I2C_TRANSFER_SIMPLE;
864 break;
865 case pmac_i2c_mode_stdsub:
866 case pmac_i2c_mode_combined:
867 if (subsize > 3 || subsize < 1)
868 return -EINVAL;
869 cmd->info.sublen = subsize;
870
871 memcpy(&cmd->info.subaddr, ((char *)&subaddr) + (4 - subsize),
872 subsize);
873 if (bus->mode == pmac_i2c_mode_stdsub)
874 cmd->info.type = SMU_I2C_TRANSFER_STDSUB;
875 else
876 cmd->info.type = SMU_I2C_TRANSFER_COMBINED;
877 break;
878 default:
879 return -EINVAL;
880 }
881 if (!read && len)
882 memcpy(cmd->info.data, data, len);
883
884 init_completion(&comp);
885 cmd->done = smu_i2c_complete;
886 cmd->misc = ∁
887 rc = smu_queue_i2c(cmd);
888 if (rc < 0)
889 return rc;
890 wait_for_completion(&comp);
891 rc = cmd->status;
892
893 if (read && len)
894 memcpy(data, cmd->info.data, len);
895 return rc < 0 ? rc : 0;
896}
897
898static void __init smu_i2c_probe(void)
899{
900 struct device_node *controller, *busnode;
901 struct pmac_i2c_bus *bus;
902 const u32 *reg;
903 int sz;
904
905 if (!smu_present())
906 return;
907
908 controller = of_find_node_by_name(NULL, "smu-i2c-control");
909 if (controller == NULL)
910 controller = of_find_node_by_name(NULL, "smu");
911 if (controller == NULL)
912 return;
913
914 printk(KERN_INFO "SMU i2c %pOF\n", controller);
915
916
917
918
919
920 for (busnode = NULL;
921 (busnode = of_get_next_child(controller, busnode)) != NULL;) {
922 if (strcmp(busnode->type, "i2c") &&
923 strcmp(busnode->type, "i2c-bus"))
924 continue;
925 reg = of_get_property(busnode, "reg", NULL);
926 if (reg == NULL)
927 continue;
928
929 sz = sizeof(struct pmac_i2c_bus) + sizeof(struct smu_i2c_cmd);
930 bus = kzalloc(sz, GFP_KERNEL);
931 if (bus == NULL)
932 return;
933
934 bus->controller = controller;
935 bus->busnode = of_node_get(busnode);
936 bus->type = pmac_i2c_bus_smu;
937 bus->channel = *reg;
938 bus->mode = pmac_i2c_mode_std;
939 bus->hostdata = bus + 1;
940 bus->xfer = smu_i2c_xfer;
941 mutex_init(&bus->mutex);
942 lockdep_set_class(&bus->mutex, &bus->lock_key);
943 bus->flags = 0;
944 list_add(&bus->link, &pmac_i2c_busses);
945
946 printk(KERN_INFO " channel %x bus %pOF\n",
947 bus->channel, busnode);
948 }
949}
950
951#endif
952
953
954
955
956
957
958
959
960struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node)
961{
962 struct device_node *p = of_node_get(node);
963 struct device_node *prev = NULL;
964 struct pmac_i2c_bus *bus;
965
966 while(p) {
967 list_for_each_entry(bus, &pmac_i2c_busses, link) {
968 if (p == bus->busnode) {
969 if (prev && bus->flags & pmac_i2c_multibus) {
970 const u32 *reg;
971 reg = of_get_property(prev, "reg",
972 NULL);
973 if (!reg)
974 continue;
975 if (((*reg) >> 8) != bus->channel)
976 continue;
977 }
978 of_node_put(p);
979 of_node_put(prev);
980 return bus;
981 }
982 }
983 of_node_put(prev);
984 prev = p;
985 p = of_get_parent(p);
986 }
987 return NULL;
988}
989EXPORT_SYMBOL_GPL(pmac_i2c_find_bus);
990
991u8 pmac_i2c_get_dev_addr(struct device_node *device)
992{
993 const u32 *reg = of_get_property(device, "reg", NULL);
994
995 if (reg == NULL)
996 return 0;
997
998 return (*reg) & 0xff;
999}
1000EXPORT_SYMBOL_GPL(pmac_i2c_get_dev_addr);
1001
1002struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus)
1003{
1004 return bus->controller;
1005}
1006EXPORT_SYMBOL_GPL(pmac_i2c_get_controller);
1007
1008struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus)
1009{
1010 return bus->busnode;
1011}
1012EXPORT_SYMBOL_GPL(pmac_i2c_get_bus_node);
1013
1014int pmac_i2c_get_type(struct pmac_i2c_bus *bus)
1015{
1016 return bus->type;
1017}
1018EXPORT_SYMBOL_GPL(pmac_i2c_get_type);
1019
1020int pmac_i2c_get_flags(struct pmac_i2c_bus *bus)
1021{
1022 return bus->flags;
1023}
1024EXPORT_SYMBOL_GPL(pmac_i2c_get_flags);
1025
1026int pmac_i2c_get_channel(struct pmac_i2c_bus *bus)
1027{
1028 return bus->channel;
1029}
1030EXPORT_SYMBOL_GPL(pmac_i2c_get_channel);
1031
1032
1033struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus)
1034{
1035 return &bus->adapter;
1036}
1037EXPORT_SYMBOL_GPL(pmac_i2c_get_adapter);
1038
1039struct 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}
1048EXPORT_SYMBOL_GPL(pmac_i2c_adapter_to_bus);
1049
1050int 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}
1058EXPORT_SYMBOL_GPL(pmac_i2c_match_adapter);
1059
1060int 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}
1074EXPORT_SYMBOL_GPL(pmac_low_i2c_lock);
1075
1076int 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}
1091EXPORT_SYMBOL_GPL(pmac_low_i2c_unlock);
1092
1093
1094int 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}
1109EXPORT_SYMBOL_GPL(pmac_i2c_open);
1110
1111void 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}
1119EXPORT_SYMBOL_GPL(pmac_i2c_close);
1120
1121int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode)
1122{
1123 WARN_ON(!bus->opened);
1124
1125
1126
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 %pOF !\n", mode, bus->busnode);
1131 return -EINVAL;
1132 }
1133 bus->mode = mode;
1134
1135 return 0;
1136}
1137EXPORT_SYMBOL_GPL(pmac_i2c_setmode);
1138
1139int 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 %pOF\n", bus->channel, addrdir, bus->mode, subsize,
1148 subaddr, len, bus->busnode);
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}
1158EXPORT_SYMBOL_GPL(pmac_i2c_xfer);
1159
1160
1161enum {
1162 pmac_i2c_quirk_invmask = 0x00000001u,
1163 pmac_i2c_quirk_skip = 0x00000002u,
1164};
1165
1166static 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
1177
1178
1179
1180
1181
1182
1183
1184
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
1196
1197
1198
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
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
1225struct 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
1235static 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 %pOF (pfunc)\n",
1243 func->node);
1244 return NULL;
1245 }
1246 if (pmac_i2c_open(bus, 0)) {
1247 printk(KERN_ERR "low_i2c: Can't open i2c bus for %pOF (pfunc)\n",
1248 func->node);
1249 return NULL;
1250 }
1251
1252
1253
1254
1255
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
1268static 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 kfree(inst);
1276}
1277
1278static int pmac_i2c_do_read(PMF_STD_ARGS, u32 len)
1279{
1280 struct pmac_i2c_pf_inst *inst = instdata;
1281
1282 inst->bytes = len;
1283 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 0, 0,
1284 inst->buffer, len);
1285}
1286
1287static int pmac_i2c_do_write(PMF_STD_ARGS, u32 len, const u8 *data)
1288{
1289 struct pmac_i2c_pf_inst *inst = instdata;
1290
1291 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0,
1292 (u8 *)data, len);
1293}
1294
1295
1296
1297
1298
1299
1300
1301static void pmac_i2c_do_apply_rmw(struct pmac_i2c_pf_inst *inst,
1302 u32 len, const u8 *mask, const u8 *val)
1303{
1304 int i;
1305
1306 if (inst->quirks & pmac_i2c_quirk_invmask) {
1307 for (i = 0; i < len; i ++)
1308 inst->scratch[i] = (inst->buffer[i] & mask[i]) | val[i];
1309 } else {
1310 for (i = 0; i < len; i ++)
1311 inst->scratch[i] = (inst->buffer[i] & ~mask[i])
1312 | (val[i] & mask[i]);
1313 }
1314}
1315
1316static int pmac_i2c_do_rmw(PMF_STD_ARGS, u32 masklen, u32 valuelen,
1317 u32 totallen, const u8 *maskdata,
1318 const u8 *valuedata)
1319{
1320 struct pmac_i2c_pf_inst *inst = instdata;
1321
1322 if (masklen > inst->bytes || valuelen > inst->bytes ||
1323 totallen > inst->bytes || valuelen > masklen)
1324 return -EINVAL;
1325
1326 pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata);
1327
1328 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0,
1329 inst->scratch, totallen);
1330}
1331
1332static int pmac_i2c_do_read_sub(PMF_STD_ARGS, u8 subaddr, u32 len)
1333{
1334 struct pmac_i2c_pf_inst *inst = instdata;
1335
1336 inst->bytes = len;
1337 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 1, subaddr,
1338 inst->buffer, len);
1339}
1340
1341static int pmac_i2c_do_write_sub(PMF_STD_ARGS, u8 subaddr, u32 len,
1342 const u8 *data)
1343{
1344 struct pmac_i2c_pf_inst *inst = instdata;
1345
1346 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1,
1347 subaddr, (u8 *)data, len);
1348}
1349
1350static int pmac_i2c_do_set_mode(PMF_STD_ARGS, int mode)
1351{
1352 struct pmac_i2c_pf_inst *inst = instdata;
1353
1354 return pmac_i2c_setmode(inst->bus, mode);
1355}
1356
1357static int pmac_i2c_do_rmw_sub(PMF_STD_ARGS, u8 subaddr, u32 masklen,
1358 u32 valuelen, u32 totallen, const u8 *maskdata,
1359 const u8 *valuedata)
1360{
1361 struct pmac_i2c_pf_inst *inst = instdata;
1362
1363 if (masklen > inst->bytes || valuelen > inst->bytes ||
1364 totallen > inst->bytes || valuelen > masklen)
1365 return -EINVAL;
1366
1367 pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata);
1368
1369 return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1,
1370 subaddr, inst->scratch, totallen);
1371}
1372
1373static int pmac_i2c_do_mask_and_comp(PMF_STD_ARGS, u32 len,
1374 const u8 *maskdata,
1375 const u8 *valuedata)
1376{
1377 struct pmac_i2c_pf_inst *inst = instdata;
1378 int i, match;
1379
1380
1381 if (!args || !args->count || !args->u[0].p)
1382 return -EINVAL;
1383
1384
1385 if (len > inst->bytes)
1386 return -EINVAL;
1387
1388 for (i = 0, match = 1; match && i < len; i ++)
1389 if ((inst->buffer[i] & maskdata[i]) != valuedata[i])
1390 match = 0;
1391 *args->u[0].p = match;
1392 return 0;
1393}
1394
1395static int pmac_i2c_do_delay(PMF_STD_ARGS, u32 duration)
1396{
1397 msleep((duration + 999) / 1000);
1398 return 0;
1399}
1400
1401
1402static struct pmf_handlers pmac_i2c_pfunc_handlers = {
1403 .begin = pmac_i2c_do_begin,
1404 .end = pmac_i2c_do_end,
1405 .read_i2c = pmac_i2c_do_read,
1406 .write_i2c = pmac_i2c_do_write,
1407 .rmw_i2c = pmac_i2c_do_rmw,
1408 .read_i2c_sub = pmac_i2c_do_read_sub,
1409 .write_i2c_sub = pmac_i2c_do_write_sub,
1410 .rmw_i2c_sub = pmac_i2c_do_rmw_sub,
1411 .set_i2c_mode = pmac_i2c_do_set_mode,
1412 .mask_and_compare = pmac_i2c_do_mask_and_comp,
1413 .delay = pmac_i2c_do_delay,
1414};
1415
1416static void __init pmac_i2c_dev_create(struct device_node *np, int quirks)
1417{
1418 DBG("dev_create(%pOF)\n", np);
1419
1420 pmf_register_driver(np, &pmac_i2c_pfunc_handlers,
1421 (void *)(long)quirks);
1422}
1423
1424static void __init pmac_i2c_dev_init(struct device_node *np, int quirks)
1425{
1426 DBG("dev_create(%pOF)\n", np);
1427
1428 pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_INIT, NULL);
1429}
1430
1431static void pmac_i2c_dev_suspend(struct device_node *np, int quirks)
1432{
1433 DBG("dev_suspend(%pOF)\n", np);
1434 pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_SLEEP, NULL);
1435}
1436
1437static void pmac_i2c_dev_resume(struct device_node *np, int quirks)
1438{
1439 DBG("dev_resume(%pOF)\n", np);
1440 pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_WAKE, NULL);
1441}
1442
1443void pmac_pfunc_i2c_suspend(void)
1444{
1445 pmac_i2c_devscan(pmac_i2c_dev_suspend);
1446}
1447
1448void pmac_pfunc_i2c_resume(void)
1449{
1450 pmac_i2c_devscan(pmac_i2c_dev_resume);
1451}
1452
1453
1454
1455
1456
1457
1458int __init pmac_i2c_init(void)
1459{
1460 static int i2c_inited;
1461
1462 if (i2c_inited)
1463 return 0;
1464 i2c_inited = 1;
1465
1466
1467 kw_i2c_probe();
1468
1469#ifdef CONFIG_ADB_PMU
1470
1471 pmu_i2c_probe();
1472#endif
1473
1474#ifdef CONFIG_PMAC_SMU
1475
1476 smu_i2c_probe();
1477#endif
1478
1479
1480 pmac_i2c_devscan(pmac_i2c_dev_create);
1481
1482 return 0;
1483}
1484machine_arch_initcall(powermac, pmac_i2c_init);
1485
1486
1487
1488
1489
1490static int __init pmac_i2c_create_platform_devices(void)
1491{
1492 struct pmac_i2c_bus *bus;
1493 int i = 0;
1494
1495
1496
1497
1498
1499 pmac_i2c_force_poll = 0;
1500
1501
1502 list_for_each_entry(bus, &pmac_i2c_busses, link) {
1503 bus->platform_dev =
1504 platform_device_alloc("i2c-powermac", i++);
1505 if (bus->platform_dev == NULL)
1506 return -ENOMEM;
1507 bus->platform_dev->dev.platform_data = bus;
1508 bus->platform_dev->dev.of_node = bus->busnode;
1509 platform_device_add(bus->platform_dev);
1510 }
1511
1512
1513 pmac_i2c_devscan(pmac_i2c_dev_init);
1514
1515 return 0;
1516}
1517machine_subsys_initcall(powermac, pmac_i2c_create_platform_devices);
1518