Merge ../linux-2.6/
[linux-2.6] / 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/config.h>
34 #include <linux/types.h>
35 #include <linux/sched.h>
36 #include <linux/init.h>
37 #include <linux/module.h>
38 #include <linux/adb.h>
39 #include <linux/pmu.h>
40 #include <linux/delay.h>
41 #include <linux/completion.h>
42 #include <linux/platform_device.h>
43 #include <linux/interrupt.h>
44 #include <linux/completion.h>
45 #include <linux/timer.h>
46 #include <asm/keylargo.h>
47 #include <asm/uninorth.h>
48 #include <asm/io.h>
49 #include <asm/prom.h>
50 #include <asm/machdep.h>
51 #include <asm/smu.h>
52 #include <asm/pmac_pfunc.h>
53 #include <asm/pmac_low_i2c.h>
54
55 #ifdef DEBUG
56 #define DBG(x...) do {\
57                 printk(KERN_DEBUG "low_i2c:" x);        \
58         } while(0)
59 #else
60 #define DBG(x...)
61 #endif
62
63 #ifdef DEBUG_LOW
64 #define DBG_LOW(x...) do {\
65                 printk(KERN_DEBUG "low_i2c:" x);        \
66         } while(0)
67 #else
68 #define DBG_LOW(x...)
69 #endif
70
71
72 static int pmac_i2c_force_poll = 1;
73
74 /*
75  * A bus structure. Each bus in the system has such a structure associated.
76  */
77 struct pmac_i2c_bus
78 {
79         struct list_head        link;
80         struct device_node      *controller;
81         struct device_node      *busnode;
82         int                     type;
83         int                     flags;
84         struct i2c_adapter      *adapter;
85         void                    *hostdata;
86         int                     channel;        /* some hosts have multiple */
87         int                     mode;           /* current mode */
88         struct semaphore        sem;
89         int                     opened;
90         int                     polled;         /* open mode */
91         struct platform_device  *platform_dev;
92
93         /* ops */
94         int (*open)(struct pmac_i2c_bus *bus);
95         void (*close)(struct pmac_i2c_bus *bus);
96         int (*xfer)(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
97                     u32 subaddr, u8 *data, int len);
98 };
99
100 static LIST_HEAD(pmac_i2c_busses);
101
102 /*
103  * Keywest implementation
104  */
105
106 struct pmac_i2c_host_kw
107 {
108         struct semaphore        mutex;          /* Access mutex for use by
109                                                  * i2c-keywest */
110         void __iomem            *base;          /* register base address */
111         int                     bsteps;         /* register stepping */
112         int                     speed;          /* speed */
113         int                     irq;
114         u8                      *data;
115         unsigned                len;
116         int                     state;
117         int                     rw;
118         int                     polled;
119         int                     result;
120         struct completion       complete;
121         spinlock_t              lock;
122         struct timer_list       timeout_timer;
123 };
124
125 /* Register indices */
126 typedef enum {
127         reg_mode = 0,
128         reg_control,
129         reg_status,
130         reg_isr,
131         reg_ier,
132         reg_addr,
133         reg_subaddr,
134         reg_data
135 } reg_t;
136
137 /* The Tumbler audio equalizer can be really slow sometimes */
138 #define KW_POLL_TIMEOUT         (2*HZ)
139
140 /* Mode register */
141 #define KW_I2C_MODE_100KHZ      0x00
142 #define KW_I2C_MODE_50KHZ       0x01
143 #define KW_I2C_MODE_25KHZ       0x02
144 #define KW_I2C_MODE_DUMB        0x00
145 #define KW_I2C_MODE_STANDARD    0x04
146 #define KW_I2C_MODE_STANDARDSUB 0x08
147 #define KW_I2C_MODE_COMBINED    0x0C
148 #define KW_I2C_MODE_MODE_MASK   0x0C
149 #define KW_I2C_MODE_CHAN_MASK   0xF0
150
151 /* Control register */
152 #define KW_I2C_CTL_AAK          0x01
153 #define KW_I2C_CTL_XADDR        0x02
154 #define KW_I2C_CTL_STOP         0x04
155 #define KW_I2C_CTL_START        0x08
156
157 /* Status register */
158 #define KW_I2C_STAT_BUSY        0x01
159 #define KW_I2C_STAT_LAST_AAK    0x02
160 #define KW_I2C_STAT_LAST_RW     0x04
161 #define KW_I2C_STAT_SDA         0x08
162 #define KW_I2C_STAT_SCL         0x10
163
164 /* IER & ISR registers */
165 #define KW_I2C_IRQ_DATA         0x01
166 #define KW_I2C_IRQ_ADDR         0x02
167 #define KW_I2C_IRQ_STOP         0x04
168 #define KW_I2C_IRQ_START        0x08
169 #define KW_I2C_IRQ_MASK         0x0F
170
171 /* State machine states */
172 enum {
173         state_idle,
174         state_addr,
175         state_read,
176         state_write,
177         state_stop,
178         state_dead
179 };
180
181 #define WRONG_STATE(name) do {\
182                 printk(KERN_DEBUG "KW: wrong state. Got %s, state: %s " \
183                        "(isr: %02x)\n", \
184                        name, __kw_state_names[host->state], isr); \
185         } while(0)
186
187 static const char *__kw_state_names[] = {
188         "state_idle",
189         "state_addr",
190         "state_read",
191         "state_write",
192         "state_stop",
193         "state_dead"
194 };
195
196 static inline u8 __kw_read_reg(struct pmac_i2c_host_kw *host, reg_t reg)
197 {
198         return readb(host->base + (((unsigned int)reg) << host->bsteps));
199 }
200
201 static inline void __kw_write_reg(struct pmac_i2c_host_kw *host,
202                                   reg_t reg, u8 val)
203 {
204         writeb(val, host->base + (((unsigned)reg) << host->bsteps));
205         (void)__kw_read_reg(host, reg_subaddr);
206 }
207
208 #define kw_write_reg(reg, val)  __kw_write_reg(host, reg, val)
209 #define kw_read_reg(reg)        __kw_read_reg(host, reg)
210
211 static u8 kw_i2c_wait_interrupt(struct pmac_i2c_host_kw *host)
212 {
213         int i, j;
214         u8 isr;
215         
216         for (i = 0; i < 1000; i++) {
217                 isr = kw_read_reg(reg_isr) & KW_I2C_IRQ_MASK;
218                 if (isr != 0)
219                         return isr;
220
221                 /* This code is used with the timebase frozen, we cannot rely
222                  * on udelay nor schedule when in polled mode !
223                  * For now, just use a bogus loop....
224                  */
225                 if (host->polled) {
226                         for (j = 1; j < 100000; j++)
227                                 mb();
228                 } else
229                         msleep(1);
230         }
231         return isr;
232 }
233
234 static void kw_i2c_do_stop(struct pmac_i2c_host_kw *host, int result)
235 {
236         kw_write_reg(reg_control, KW_I2C_CTL_STOP);
237         host->state = state_stop;
238         host->result = result;
239 }
240
241
242 static void kw_i2c_handle_interrupt(struct pmac_i2c_host_kw *host, u8 isr)
243 {
244         u8 ack;
245
246         DBG_LOW("kw_handle_interrupt(%s, isr: %x)\n",
247                 __kw_state_names[host->state], isr);
248
249         if (host->state == state_idle) {
250                 printk(KERN_WARNING "low_i2c: Keywest got an out of state"
251                        " interrupt, ignoring\n");
252                 kw_write_reg(reg_isr, isr);
253                 return;
254         }
255
256         if (isr == 0) {
257                 printk(KERN_WARNING "low_i2c: Timeout in i2c transfer"
258                        " on keywest !\n");
259                 if (host->state != state_stop) {
260                         kw_i2c_do_stop(host, -EIO);
261                         return;
262                 }
263                 ack = kw_read_reg(reg_status);
264                 if (ack & KW_I2C_STAT_BUSY)
265                         kw_write_reg(reg_status, 0);
266                 host->state = state_idle;
267                 kw_write_reg(reg_ier, 0x00);
268                 if (!host->polled)
269                         complete(&host->complete);
270                 return;
271         }
272
273         if (isr & KW_I2C_IRQ_ADDR) {
274                 ack = kw_read_reg(reg_status);
275                 if (host->state != state_addr) {
276                         WRONG_STATE("KW_I2C_IRQ_ADDR"); 
277                         kw_i2c_do_stop(host, -EIO);
278                 }
279                 if ((ack & KW_I2C_STAT_LAST_AAK) == 0) {
280                         host->result = -ENXIO;
281                         host->state = state_stop;
282                         DBG_LOW("KW: NAK on address\n");
283                 } else {
284                         if (host->len == 0)
285                                 kw_i2c_do_stop(host, 0);
286                         else if (host->rw) {
287                                 host->state = state_read;
288                                 if (host->len > 1)
289                                         kw_write_reg(reg_control,
290                                                      KW_I2C_CTL_AAK);
291                         } else {
292                                 host->state = state_write;
293                                 kw_write_reg(reg_data, *(host->data++));
294                                 host->len--;
295                         }
296                 }
297                 kw_write_reg(reg_isr, KW_I2C_IRQ_ADDR);
298         }
299
300         if (isr & KW_I2C_IRQ_DATA) {
301                 if (host->state == state_read) {
302                         *(host->data++) = kw_read_reg(reg_data);
303                         host->len--;
304                         kw_write_reg(reg_isr, KW_I2C_IRQ_DATA);
305                         if (host->len == 0)
306                                 host->state = state_stop;
307                         else if (host->len == 1)
308                                 kw_write_reg(reg_control, 0);
309                 } else if (host->state == state_write) {
310                         ack = kw_read_reg(reg_status);
311                         if ((ack & KW_I2C_STAT_LAST_AAK) == 0) {
312                                 DBG_LOW("KW: nack on data write\n");
313                                 host->result = -EFBIG;
314                                 host->state = state_stop;
315                         } else if (host->len) {
316                                 kw_write_reg(reg_data, *(host->data++));
317                                 host->len--;
318                         } else
319                                 kw_i2c_do_stop(host, 0);
320                 } else {
321                         WRONG_STATE("KW_I2C_IRQ_DATA"); 
322                         if (host->state != state_stop)
323                                 kw_i2c_do_stop(host, -EIO);
324                 }
325                 kw_write_reg(reg_isr, KW_I2C_IRQ_DATA);
326         }
327
328         if (isr & KW_I2C_IRQ_STOP) {
329                 kw_write_reg(reg_isr, KW_I2C_IRQ_STOP);
330                 if (host->state != state_stop) {
331                         WRONG_STATE("KW_I2C_IRQ_STOP");
332                         host->result = -EIO;
333                 }
334                 host->state = state_idle;
335                 if (!host->polled)
336                         complete(&host->complete);
337         }
338
339         /* Below should only happen in manual mode which we don't use ... */
340         if (isr & KW_I2C_IRQ_START)
341                 kw_write_reg(reg_isr, KW_I2C_IRQ_START);
342
343 }
344
345 /* Interrupt handler */
346 static irqreturn_t kw_i2c_irq(int irq, void *dev_id, struct pt_regs *regs)
347 {
348         struct pmac_i2c_host_kw *host = dev_id;
349         unsigned long flags;
350
351         spin_lock_irqsave(&host->lock, flags);
352         del_timer(&host->timeout_timer);
353         kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr));
354         if (host->state != state_idle) {
355                 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT;
356                 add_timer(&host->timeout_timer);
357         }
358         spin_unlock_irqrestore(&host->lock, flags);
359         return IRQ_HANDLED;
360 }
361
362 static void kw_i2c_timeout(unsigned long data)
363 {
364         struct pmac_i2c_host_kw *host = (struct pmac_i2c_host_kw *)data;
365         unsigned long flags;
366
367         spin_lock_irqsave(&host->lock, flags);
368         kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr));
369         if (host->state != state_idle) {
370                 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT;
371                 add_timer(&host->timeout_timer);
372         }
373         spin_unlock_irqrestore(&host->lock, flags);
374 }
375
376 static int kw_i2c_open(struct pmac_i2c_bus *bus)
377 {
378         struct pmac_i2c_host_kw *host = bus->hostdata;
379         down(&host->mutex);
380         return 0;
381 }
382
383 static void kw_i2c_close(struct pmac_i2c_bus *bus)
384 {
385         struct pmac_i2c_host_kw *host = bus->hostdata;
386         up(&host->mutex);
387 }
388
389 static int kw_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
390                        u32 subaddr, u8 *data, int len)
391 {
392         struct pmac_i2c_host_kw *host = bus->hostdata;
393         u8 mode_reg = host->speed;
394         int use_irq = host->irq != NO_IRQ && !bus->polled;
395
396         /* Setup mode & subaddress if any */
397         switch(bus->mode) {
398         case pmac_i2c_mode_dumb:
399                 return -EINVAL;
400         case pmac_i2c_mode_std:
401                 mode_reg |= KW_I2C_MODE_STANDARD;
402                 if (subsize != 0)
403                         return -EINVAL;
404                 break;
405         case pmac_i2c_mode_stdsub:
406                 mode_reg |= KW_I2C_MODE_STANDARDSUB;
407                 if (subsize != 1)
408                         return -EINVAL;
409                 break;
410         case pmac_i2c_mode_combined:
411                 mode_reg |= KW_I2C_MODE_COMBINED;
412                 if (subsize != 1)
413                         return -EINVAL;
414                 break;
415         }
416
417         /* Setup channel & clear pending irqs */
418         kw_write_reg(reg_isr, kw_read_reg(reg_isr));
419         kw_write_reg(reg_mode, mode_reg | (bus->channel << 4));
420         kw_write_reg(reg_status, 0);
421
422         /* Set up address and r/w bit, strip possible stale bus number from
423          * address top bits
424          */
425         kw_write_reg(reg_addr, addrdir & 0xff);
426
427         /* Set up the sub address */
428         if ((mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_STANDARDSUB
429             || (mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_COMBINED)
430                 kw_write_reg(reg_subaddr, subaddr);
431
432         /* Prepare for async operations */
433         host->data = data;
434         host->len = len;
435         host->state = state_addr;
436         host->result = 0;
437         host->rw = (addrdir & 1);
438         host->polled = bus->polled;
439
440         /* Enable interrupt if not using polled mode and interrupt is
441          * available
442          */
443         if (use_irq) {
444                 /* Clear completion */
445                 INIT_COMPLETION(host->complete);
446                 /* Ack stale interrupts */
447                 kw_write_reg(reg_isr, kw_read_reg(reg_isr));
448                 /* Arm timeout */
449                 host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT;
450                 add_timer(&host->timeout_timer);
451                 /* Enable emission */
452                 kw_write_reg(reg_ier, KW_I2C_IRQ_MASK);
453         }
454
455         /* Start sending address */
456         kw_write_reg(reg_control, KW_I2C_CTL_XADDR);
457
458         /* Wait for completion */
459         if (use_irq)
460                 wait_for_completion(&host->complete);
461         else {
462                 while(host->state != state_idle) {
463                         unsigned long flags;
464
465                         u8 isr = kw_i2c_wait_interrupt(host);
466                         spin_lock_irqsave(&host->lock, flags);
467                         kw_i2c_handle_interrupt(host, isr);
468                         spin_unlock_irqrestore(&host->lock, flags);
469                 }
470         }
471
472         /* Disable emission */
473         kw_write_reg(reg_ier, 0);
474
475         return host->result;
476 }
477
478 static struct pmac_i2c_host_kw *__init kw_i2c_host_init(struct device_node *np)
479 {
480         struct pmac_i2c_host_kw *host;
481         u32                     *psteps, *prate, *addrp, 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 = (u32 *)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         init_MUTEX(&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 = (u32 *)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 = (u32 *)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         if (np->n_intrs > 0)
527                 host->irq = np->intrs[0].line;
528         else
529                 host->irq = NO_IRQ;
530
531         host->base = ioremap((*addrp), 0x1000);
532         if (host->base == NULL) {
533                 printk(KERN_ERR "low_i2c: Can't map registers for %s\n",
534                        np->full_name);
535                 kfree(host);
536                 return NULL;
537         }
538
539         /* Make sure IRQ is disabled */
540         kw_write_reg(reg_ier, 0);
541
542         /* Request chip interrupt */
543         if (request_irq(host->irq, kw_i2c_irq, 0, "keywest i2c", host))
544                 host->irq = NO_IRQ;
545
546         printk(KERN_INFO "KeyWest i2c @0x%08x irq %d %s\n",
547                *addrp, host->irq, np->full_name);
548
549         return host;
550 }
551
552
553 static void __init kw_i2c_add(struct pmac_i2c_host_kw *host,
554                               struct device_node *controller,
555                               struct device_node *busnode,
556                               int channel)
557 {
558         struct pmac_i2c_bus *bus;
559
560         bus = kzalloc(sizeof(struct pmac_i2c_bus), GFP_KERNEL);
561         if (bus == NULL)
562                 return;
563
564         bus->controller = of_node_get(controller);
565         bus->busnode = of_node_get(busnode);
566         bus->type = pmac_i2c_bus_keywest;
567         bus->hostdata = host;
568         bus->channel = channel;
569         bus->mode = pmac_i2c_mode_std;
570         bus->open = kw_i2c_open;
571         bus->close = kw_i2c_close;
572         bus->xfer = kw_i2c_xfer;
573         init_MUTEX(&bus->sem);
574         if (controller == busnode)
575                 bus->flags = pmac_i2c_multibus;
576         list_add(&bus->link, &pmac_i2c_busses);
577
578         printk(KERN_INFO " channel %d bus %s\n", channel,
579                (controller == busnode) ? "<multibus>" : busnode->full_name);
580 }
581
582 static void __init kw_i2c_probe(void)
583 {
584         struct device_node *np, *child, *parent;
585
586         /* Probe keywest-i2c busses */
587         for (np = NULL;
588              (np = of_find_compatible_node(np, "i2c","keywest-i2c")) != NULL;){
589                 struct pmac_i2c_host_kw *host;
590                 int multibus, chans, i;
591
592                 /* Found one, init a host structure */
593                 host = kw_i2c_host_init(np);
594                 if (host == NULL)
595                         continue;
596
597                 /* Now check if we have a multibus setup (old style) or if we
598                  * have proper bus nodes. Note that the "new" way (proper bus
599                  * nodes) might cause us to not create some busses that are
600                  * kept hidden in the device-tree. In the future, we might
601                  * want to work around that by creating busses without a node
602                  * but not for now
603                  */
604                 child = of_get_next_child(np, NULL);
605                 multibus = !child || strcmp(child->name, "i2c-bus");
606                 of_node_put(child);
607
608                 /* For a multibus setup, we get the bus count based on the
609                  * parent type
610                  */
611                 if (multibus) {
612                         parent = of_get_parent(np);
613                         if (parent == NULL)
614                                 continue;
615                         chans = parent->name[0] == 'u' ? 2 : 1;
616                         for (i = 0; i < chans; i++)
617                                 kw_i2c_add(host, np, np, i);
618                 } else {
619                         for (child = NULL;
620                              (child = of_get_next_child(np, child)) != NULL;) {
621                                 u32 *reg =
622                                         (u32 *)get_property(child, "reg", NULL);
623                                 if (reg == NULL)
624                                         continue;
625                                 kw_i2c_add(host, np, child, *reg);
626                         }
627                 }
628         }
629 }
630
631
632 /*
633  *
634  * PMU implementation
635  *
636  */
637
638 #ifdef CONFIG_ADB_PMU
639
640 /*
641  * i2c command block to the PMU
642  */
643 struct pmu_i2c_hdr {
644         u8      bus;
645         u8      mode;
646         u8      bus2;
647         u8      address;
648         u8      sub_addr;
649         u8      comb_addr;
650         u8      count;
651         u8      data[];
652 };
653
654 static void pmu_i2c_complete(struct adb_request *req)
655 {
656         complete(req->arg);
657 }
658
659 static int pmu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
660                         u32 subaddr, u8 *data, int len)
661 {
662         struct adb_request *req = bus->hostdata;
663         struct pmu_i2c_hdr *hdr = (struct pmu_i2c_hdr *)&req->data[1];
664         struct completion comp;
665         int read = addrdir & 1;
666         int retry;
667         int rc = 0;
668
669         /* For now, limit ourselves to 16 bytes transfers */
670         if (len > 16)
671                 return -EINVAL;
672
673         init_completion(&comp);
674
675         for (retry = 0; retry < 16; retry++) {
676                 memset(req, 0, sizeof(struct adb_request));
677                 hdr->bus = bus->channel;
678                 hdr->count = len;
679
680                 switch(bus->mode) {
681                 case pmac_i2c_mode_std:
682                         if (subsize != 0)
683                                 return -EINVAL;
684                         hdr->address = addrdir;
685                         hdr->mode = PMU_I2C_MODE_SIMPLE;
686                         break;
687                 case pmac_i2c_mode_stdsub:
688                 case pmac_i2c_mode_combined:
689                         if (subsize != 1)
690                                 return -EINVAL;
691                         hdr->address = addrdir & 0xfe;
692                         hdr->comb_addr = addrdir;
693                         hdr->sub_addr = subaddr;
694                         if (bus->mode == pmac_i2c_mode_stdsub)
695                                 hdr->mode = PMU_I2C_MODE_STDSUB;
696                         else
697                                 hdr->mode = PMU_I2C_MODE_COMBINED;
698                         break;
699                 default:
700                         return -EINVAL;
701                 }
702
703                 INIT_COMPLETION(comp);
704                 req->data[0] = PMU_I2C_CMD;
705                 req->reply[0] = 0xff;
706                 req->nbytes = sizeof(struct pmu_i2c_hdr) + 1;
707                 req->done = pmu_i2c_complete;
708                 req->arg = &comp;
709                 if (!read && len) {
710                         memcpy(hdr->data, data, len);
711                         req->nbytes += len;
712                 }
713                 rc = pmu_queue_request(req);
714                 if (rc)
715                         return rc;
716                 wait_for_completion(&comp);
717                 if (req->reply[0] == PMU_I2C_STATUS_OK)
718                         break;
719                 msleep(15);
720         }
721         if (req->reply[0] != PMU_I2C_STATUS_OK)
722                 return -EIO;
723
724         for (retry = 0; retry < 16; retry++) {
725                 memset(req, 0, sizeof(struct adb_request));
726
727                 /* I know that looks like a lot, slow as hell, but darwin
728                  * does it so let's be on the safe side for now
729                  */
730                 msleep(15);
731
732                 hdr->bus = PMU_I2C_BUS_STATUS;
733
734                 INIT_COMPLETION(comp);
735                 req->data[0] = PMU_I2C_CMD;
736                 req->reply[0] = 0xff;
737                 req->nbytes = 2;
738                 req->done = pmu_i2c_complete;
739                 req->arg = &comp;
740                 rc = pmu_queue_request(req);
741                 if (rc)
742                         return rc;
743                 wait_for_completion(&comp);
744
745                 if (req->reply[0] == PMU_I2C_STATUS_OK && !read)
746                         return 0;
747                 if (req->reply[0] == PMU_I2C_STATUS_DATAREAD && read) {
748                         int rlen = req->reply_len - 1;
749
750                         if (rlen != len) {
751                                 printk(KERN_WARNING "low_i2c: PMU returned %d"
752                                        " bytes, expected %d !\n", rlen, len);
753                                 return -EIO;
754                         }
755                         if (len)
756                                 memcpy(data, &req->reply[1], len);
757                         return 0;
758                 }
759         }
760         return -EIO;
761 }
762
763 static void __init pmu_i2c_probe(void)
764 {
765         struct pmac_i2c_bus *bus;
766         struct device_node *busnode;
767         int channel, sz;
768
769         if (!pmu_present())
770                 return;
771
772         /* There might or might not be a "pmu-i2c" node, we use that
773          * or via-pmu itself, whatever we find. I haven't seen a machine
774          * with separate bus nodes, so we assume a multibus setup
775          */
776         busnode = of_find_node_by_name(NULL, "pmu-i2c");
777         if (busnode == NULL)
778                 busnode = of_find_node_by_name(NULL, "via-pmu");
779         if (busnode == NULL)
780                 return;
781
782         printk(KERN_INFO "PMU i2c %s\n", busnode->full_name);
783
784         /*
785          * We add bus 1 and 2 only for now, bus 0 is "special"
786          */
787         for (channel = 1; channel <= 2; channel++) {
788                 sz = sizeof(struct pmac_i2c_bus) + sizeof(struct adb_request);
789                 bus = kzalloc(sz, GFP_KERNEL);
790                 if (bus == NULL)
791                         return;
792
793                 bus->controller = busnode;
794                 bus->busnode = busnode;
795                 bus->type = pmac_i2c_bus_pmu;
796                 bus->channel = channel;
797                 bus->mode = pmac_i2c_mode_std;
798                 bus->hostdata = bus + 1;
799                 bus->xfer = pmu_i2c_xfer;
800                 init_MUTEX(&bus->sem);
801                 bus->flags = pmac_i2c_multibus;
802                 list_add(&bus->link, &pmac_i2c_busses);
803
804                 printk(KERN_INFO " channel %d bus <multibus>\n", channel);
805         }
806 }
807
808 #endif /* CONFIG_ADB_PMU */
809
810
811 /*
812  *
813  * SMU implementation
814  *
815  */
816
817 #ifdef CONFIG_PMAC_SMU
818
819 static void smu_i2c_complete(struct smu_i2c_cmd *cmd, void *misc)
820 {
821         complete(misc);
822 }
823
824 static int smu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
825                         u32 subaddr, u8 *data, int len)
826 {
827         struct smu_i2c_cmd *cmd = bus->hostdata;
828         struct completion comp;
829         int read = addrdir & 1;
830         int rc = 0;
831
832         if ((read && len > SMU_I2C_READ_MAX) ||
833             ((!read) && len > SMU_I2C_WRITE_MAX))
834                 return -EINVAL;
835
836         memset(cmd, 0, sizeof(struct smu_i2c_cmd));
837         cmd->info.bus = bus->channel;
838         cmd->info.devaddr = addrdir;
839         cmd->info.datalen = len;
840
841         switch(bus->mode) {
842         case pmac_i2c_mode_std:
843                 if (subsize != 0)
844                         return -EINVAL;
845                 cmd->info.type = SMU_I2C_TRANSFER_SIMPLE;
846                 break;
847         case pmac_i2c_mode_stdsub:
848         case pmac_i2c_mode_combined:
849                 if (subsize > 3 || subsize < 1)
850                         return -EINVAL;
851                 cmd->info.sublen = subsize;
852                 /* that's big-endian only but heh ! */
853                 memcpy(&cmd->info.subaddr, ((char *)&subaddr) + (4 - subsize),
854                        subsize);
855                 if (bus->mode == pmac_i2c_mode_stdsub)
856                         cmd->info.type = SMU_I2C_TRANSFER_STDSUB;
857                 else
858                         cmd->info.type = SMU_I2C_TRANSFER_COMBINED;
859                 break;
860         default:
861                 return -EINVAL;
862         }
863         if (!read && len)
864                 memcpy(cmd->info.data, data, len);
865
866         init_completion(&comp);
867         cmd->done = smu_i2c_complete;
868         cmd->misc = &comp;
869         rc = smu_queue_i2c(cmd);
870         if (rc < 0)
871                 return rc;
872         wait_for_completion(&comp);
873         rc = cmd->status;
874
875         if (read && len)
876                 memcpy(data, cmd->info.data, len);
877         return rc < 0 ? rc : 0;
878 }
879
880 static void __init smu_i2c_probe(void)
881 {
882         struct device_node *controller, *busnode;
883         struct pmac_i2c_bus *bus;
884         u32 *reg;
885         int sz;
886
887         if (!smu_present())
888                 return;
889
890         controller = of_find_node_by_name(NULL, "smu-i2c-control");
891         if (controller == NULL)
892                 controller = of_find_node_by_name(NULL, "smu");
893         if (controller == NULL)
894                 return;
895
896         printk(KERN_INFO "SMU i2c %s\n", controller->full_name);
897
898         /* Look for childs, note that they might not be of the right
899          * type as older device trees mix i2c busses and other thigns
900          * at the same level
901          */
902         for (busnode = NULL;
903              (busnode = of_get_next_child(controller, busnode)) != NULL;) {
904                 if (strcmp(busnode->type, "i2c") &&
905                     strcmp(busnode->type, "i2c-bus"))
906                         continue;
907                 reg = (u32 *)get_property(busnode, "reg", NULL);
908                 if (reg == NULL)
909                         continue;
910
911                 sz = sizeof(struct pmac_i2c_bus) + sizeof(struct smu_i2c_cmd);
912                 bus = kzalloc(sz, GFP_KERNEL);
913                 if (bus == NULL)
914                         return;
915
916                 bus->controller = controller;
917                 bus->busnode = of_node_get(busnode);
918                 bus->type = pmac_i2c_bus_smu;
919                 bus->channel = *reg;
920                 bus->mode = pmac_i2c_mode_std;
921                 bus->hostdata = bus + 1;
922                 bus->xfer = smu_i2c_xfer;
923                 init_MUTEX(&bus->sem);
924                 bus->flags = 0;
925                 list_add(&bus->link, &pmac_i2c_busses);
926
927                 printk(KERN_INFO " channel %x bus %s\n",
928                        bus->channel, busnode->full_name);
929         }
930 }
931
932 #endif /* CONFIG_PMAC_SMU */
933
934 /*
935  *
936  * Core code
937  *
938  */
939
940
941 struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node)
942 {
943         struct device_node *p = of_node_get(node);
944         struct device_node *prev = NULL;
945         struct pmac_i2c_bus *bus;
946
947         while(p) {
948                 list_for_each_entry(bus, &pmac_i2c_busses, link) {
949                         if (p == bus->busnode) {
950                                 if (prev && bus->flags & pmac_i2c_multibus) {
951                                         u32 *reg;
952                                         reg = (u32 *)get_property(prev, "reg",
953                                                                   NULL);
954                                         if (!reg)
955                                                 continue;
956                                         if (((*reg) >> 8) != bus->channel)
957                                                 continue;
958                                 }
959                                 of_node_put(p);
960                                 of_node_put(prev);
961                                 return bus;
962                         }
963                 }
964                 of_node_put(prev);
965                 prev = p;
966                 p = of_get_parent(p);
967         }
968         return NULL;
969 }
970 EXPORT_SYMBOL_GPL(pmac_i2c_find_bus);
971
972 u8 pmac_i2c_get_dev_addr(struct device_node *device)
973 {
974         u32 *reg = (u32 *)get_property(device, "reg", NULL);
975
976         if (reg == NULL)
977                 return 0;
978
979         return (*reg) & 0xff;
980 }
981 EXPORT_SYMBOL_GPL(pmac_i2c_get_dev_addr);
982
983 struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus)
984 {
985         return bus->controller;
986 }
987 EXPORT_SYMBOL_GPL(pmac_i2c_get_controller);
988
989 struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus)
990 {
991         return bus->busnode;
992 }
993 EXPORT_SYMBOL_GPL(pmac_i2c_get_bus_node);
994
995 int pmac_i2c_get_type(struct pmac_i2c_bus *bus)
996 {
997         return bus->type;
998 }
999 EXPORT_SYMBOL_GPL(pmac_i2c_get_type);
1000
1001 int pmac_i2c_get_flags(struct pmac_i2c_bus *bus)
1002 {
1003         return bus->flags;
1004 }
1005 EXPORT_SYMBOL_GPL(pmac_i2c_get_flags);
1006
1007 int pmac_i2c_get_channel(struct pmac_i2c_bus *bus)
1008 {
1009         return bus->channel;
1010 }
1011 EXPORT_SYMBOL_GPL(pmac_i2c_get_channel);
1012
1013
1014 void pmac_i2c_attach_adapter(struct pmac_i2c_bus *bus,
1015                              struct i2c_adapter *adapter)
1016 {
1017         WARN_ON(bus->adapter != NULL);
1018         bus->adapter = adapter;
1019 }
1020 EXPORT_SYMBOL_GPL(pmac_i2c_attach_adapter);
1021
1022 void pmac_i2c_detach_adapter(struct pmac_i2c_bus *bus,
1023                              struct i2c_adapter *adapter)
1024 {
1025         WARN_ON(bus->adapter != adapter);
1026         bus->adapter = NULL;
1027 }
1028 EXPORT_SYMBOL_GPL(pmac_i2c_detach_adapter);
1029
1030 struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus)
1031 {
1032         return bus->adapter;
1033 }
1034 EXPORT_SYMBOL_GPL(pmac_i2c_get_adapter);
1035
1036 struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter)
1037 {
1038         struct pmac_i2c_bus *bus;
1039
1040         list_for_each_entry(bus, &pmac_i2c_busses, link)
1041                 if (bus->adapter == adapter)
1042                         return bus;
1043         return NULL;
1044 }
1045 EXPORT_SYMBOL_GPL(pmac_i2c_adapter_to_bus);
1046
1047 int pmac_i2c_match_adapter(struct device_node *dev, struct i2c_adapter *adapter)
1048 {
1049         struct pmac_i2c_bus *bus = pmac_i2c_find_bus(dev);
1050
1051         if (bus == NULL)
1052                 return 0;
1053         return (bus->adapter == adapter);
1054 }
1055 EXPORT_SYMBOL_GPL(pmac_i2c_match_adapter);
1056
1057 int pmac_low_i2c_lock(struct device_node *np)
1058 {
1059         struct pmac_i2c_bus *bus, *found = NULL;
1060
1061         list_for_each_entry(bus, &pmac_i2c_busses, link) {
1062                 if (np == bus->controller) {
1063                         found = bus;
1064                         break;
1065                 }
1066         }
1067         if (!found)
1068                 return -ENODEV;
1069         return pmac_i2c_open(bus, 0);
1070 }
1071 EXPORT_SYMBOL_GPL(pmac_low_i2c_lock);
1072
1073 int pmac_low_i2c_unlock(struct device_node *np)
1074 {
1075         struct pmac_i2c_bus *bus, *found = NULL;
1076
1077         list_for_each_entry(bus, &pmac_i2c_busses, link) {
1078                 if (np == bus->controller) {
1079                         found = bus;
1080                         break;
1081                 }
1082         }
1083         if (!found)
1084                 return -ENODEV;
1085         pmac_i2c_close(bus);
1086         return 0;
1087 }
1088 EXPORT_SYMBOL_GPL(pmac_low_i2c_unlock);
1089
1090
1091 int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled)
1092 {
1093         int rc;
1094
1095         down(&bus->sem);
1096         bus->polled = polled || pmac_i2c_force_poll;
1097         bus->opened = 1;
1098         bus->mode = pmac_i2c_mode_std;
1099         if (bus->open && (rc = bus->open(bus)) != 0) {
1100                 bus->opened = 0;
1101                 up(&bus->sem);
1102                 return rc;
1103         }
1104         return 0;
1105 }
1106 EXPORT_SYMBOL_GPL(pmac_i2c_open);
1107
1108 void pmac_i2c_close(struct pmac_i2c_bus *bus)
1109 {
1110         WARN_ON(!bus->opened);
1111         if (bus->close)
1112                 bus->close(bus);
1113         bus->opened = 0;
1114         up(&bus->sem);
1115 }
1116 EXPORT_SYMBOL_GPL(pmac_i2c_close);
1117
1118 int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode)
1119 {
1120         WARN_ON(!bus->opened);
1121
1122         /* Report me if you see the error below as there might be a new
1123          * "combined4" mode that I need to implement for the SMU bus
1124          */
1125         if (mode < pmac_i2c_mode_dumb || mode > pmac_i2c_mode_combined) {
1126                 printk(KERN_ERR "low_i2c: Invalid mode %d requested on"
1127                        " bus %s !\n", mode, bus->busnode->full_name);
1128                 return -EINVAL;
1129         }
1130         bus->mode = mode;
1131
1132         return 0;
1133 }
1134 EXPORT_SYMBOL_GPL(pmac_i2c_setmode);
1135
1136 int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize,
1137                   u32 subaddr, u8 *data, int len)
1138 {
1139         int rc;
1140
1141         WARN_ON(!bus->opened);
1142
1143         DBG("xfer() chan=%d, addrdir=0x%x, mode=%d, subsize=%d, subaddr=0x%x,"
1144             " %d bytes, bus %s\n", bus->channel, addrdir, bus->mode, subsize,
1145             subaddr, len, bus->busnode->full_name);
1146
1147         rc = bus->xfer(bus, addrdir, subsize, subaddr, data, len);
1148
1149 #ifdef DEBUG
1150         if (rc)
1151                 DBG("xfer error %d\n", rc);
1152 #endif
1153         return rc;
1154 }
1155 EXPORT_SYMBOL_GPL(pmac_i2c_xfer);
1156
1157 /* some quirks for platform function decoding */
1158 enum {
1159         pmac_i2c_quirk_invmask = 0x00000001u,
1160         pmac_i2c_quirk_skip = 0x00000002u,
1161 };
1162
1163 static void pmac_i2c_devscan(void (*callback)(struct device_node *dev,
1164                                               int quirks))
1165 {
1166         struct pmac_i2c_bus *bus;
1167         struct device_node *np;
1168         static struct whitelist_ent {
1169                 char *name;
1170                 char *compatible;
1171                 int quirks;
1172         } whitelist[] = {
1173                 /* XXX Study device-tree's & apple drivers are get the quirks
1174                  * right !
1175                  */
1176                 /* Workaround: It seems that running the clockspreading
1177                  * properties on the eMac will cause lockups during boot.
1178                  * The machine seems to work fine without that. So for now,
1179                  * let's make sure i2c-hwclock doesn't match about "imic"
1180                  * clocks and we'll figure out if we really need to do
1181                  * something special about those later.
1182                  */
1183                 { "i2c-hwclock", "imic5002", pmac_i2c_quirk_skip },
1184                 { "i2c-hwclock", "imic5003", pmac_i2c_quirk_skip },
1185                 { "i2c-hwclock", NULL, pmac_i2c_quirk_invmask },
1186                 { "i2c-cpu-voltage", NULL, 0},
1187                 {  "temp-monitor", NULL, 0 },
1188                 {  "supply-monitor", NULL, 0 },
1189                 { NULL, NULL, 0 },
1190         };
1191
1192         /* Only some devices need to have platform functions instanciated
1193          * here. For now, we have a table. Others, like 9554 i2c GPIOs used
1194          * on Xserve, if we ever do a driver for them, will use their own
1195          * platform function instance
1196          */
1197         list_for_each_entry(bus, &pmac_i2c_busses, link) {
1198                 for (np = NULL;
1199                      (np = of_get_next_child(bus->busnode, np)) != NULL;) {
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 (strcmp(np->name, p->name))
1207                                         continue;
1208                                 if (p->compatible &&
1209                                     !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 %s (pfunc)\n",
1240                        func->node->full_name);
1241                 return NULL;
1242         }
1243         if (pmac_i2c_open(bus, 0)) {
1244                 printk(KERN_ERR "low_i2c: Can't open i2c bus for %s (pfunc)\n",
1245                        func->node->full_name);
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         if (inst)
1273                 kfree(inst);
1274 }
1275
1276 static int pmac_i2c_do_read(PMF_STD_ARGS, u32 len)
1277 {
1278         struct pmac_i2c_pf_inst *inst = instdata;
1279
1280         inst->bytes = len;
1281         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 0, 0,
1282                              inst->buffer, len);
1283 }
1284
1285 static int pmac_i2c_do_write(PMF_STD_ARGS, u32 len, const u8 *data)
1286 {
1287         struct pmac_i2c_pf_inst *inst = instdata;
1288
1289         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0,
1290                              (u8 *)data, len);
1291 }
1292
1293 /* This function is used to do the masking & OR'ing for the "rmw" type
1294  * callbacks. Ze should apply the mask and OR in the values in the
1295  * buffer before writing back. The problem is that it seems that
1296  * various darwin drivers implement the mask/or differently, thus
1297  * we need to check the quirks first
1298  */
1299 static void pmac_i2c_do_apply_rmw(struct pmac_i2c_pf_inst *inst,
1300                                   u32 len, const u8 *mask, const u8 *val)
1301 {
1302         int i;
1303
1304         if (inst->quirks & pmac_i2c_quirk_invmask) {
1305                 for (i = 0; i < len; i ++)
1306                         inst->scratch[i] = (inst->buffer[i] & mask[i]) | val[i];
1307         } else {
1308                 for (i = 0; i < len; i ++)
1309                         inst->scratch[i] = (inst->buffer[i] & ~mask[i])
1310                                 | (val[i] & mask[i]);
1311         }
1312 }
1313
1314 static int pmac_i2c_do_rmw(PMF_STD_ARGS, u32 masklen, u32 valuelen,
1315                            u32 totallen, const u8 *maskdata,
1316                            const u8 *valuedata)
1317 {
1318         struct pmac_i2c_pf_inst *inst = instdata;
1319
1320         if (masklen > inst->bytes || valuelen > inst->bytes ||
1321             totallen > inst->bytes || valuelen > masklen)
1322                 return -EINVAL;
1323
1324         pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata);
1325
1326         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0,
1327                              inst->scratch, totallen);
1328 }
1329
1330 static int pmac_i2c_do_read_sub(PMF_STD_ARGS, u8 subaddr, u32 len)
1331 {
1332         struct pmac_i2c_pf_inst *inst = instdata;
1333
1334         inst->bytes = len;
1335         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 1, subaddr,
1336                              inst->buffer, len);
1337 }
1338
1339 static int pmac_i2c_do_write_sub(PMF_STD_ARGS, u8 subaddr, u32 len,
1340                                      const u8 *data)
1341 {
1342         struct pmac_i2c_pf_inst *inst = instdata;
1343
1344         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1,
1345                              subaddr, (u8 *)data, len);
1346 }
1347
1348 static int pmac_i2c_do_set_mode(PMF_STD_ARGS, int mode)
1349 {
1350         struct pmac_i2c_pf_inst *inst = instdata;
1351
1352         return pmac_i2c_setmode(inst->bus, mode);
1353 }
1354
1355 static int pmac_i2c_do_rmw_sub(PMF_STD_ARGS, u8 subaddr, u32 masklen,
1356                                u32 valuelen, u32 totallen, const u8 *maskdata,
1357                                const u8 *valuedata)
1358 {
1359         struct pmac_i2c_pf_inst *inst = instdata;
1360
1361         if (masklen > inst->bytes || valuelen > inst->bytes ||
1362             totallen > inst->bytes || valuelen > masklen)
1363                 return -EINVAL;
1364
1365         pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata);
1366
1367         return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1,
1368                              subaddr, inst->scratch, totallen);
1369 }
1370
1371 static int pmac_i2c_do_mask_and_comp(PMF_STD_ARGS, u32 len,
1372                                      const u8 *maskdata,
1373                                      const u8 *valuedata)
1374 {
1375         struct pmac_i2c_pf_inst *inst = instdata;
1376         int i, match;
1377
1378         /* Get return value pointer, it's assumed to be a u32 */
1379         if (!args || !args->count || !args->u[0].p)
1380                 return -EINVAL;
1381
1382         /* Check buffer */
1383         if (len > inst->bytes)
1384                 return -EINVAL;
1385
1386         for (i = 0, match = 1; match && i < len; i ++)
1387                 if ((inst->buffer[i] & maskdata[i]) != valuedata[i])
1388                         match = 0;
1389         *args->u[0].p = match;
1390         return 0;
1391 }
1392
1393 static int pmac_i2c_do_delay(PMF_STD_ARGS, u32 duration)
1394 {
1395         msleep((duration + 999) / 1000);
1396         return 0;
1397 }
1398
1399
1400 static struct pmf_handlers pmac_i2c_pfunc_handlers = {
1401         .begin                  = pmac_i2c_do_begin,
1402         .end                    = pmac_i2c_do_end,
1403         .read_i2c               = pmac_i2c_do_read,
1404         .write_i2c              = pmac_i2c_do_write,
1405         .rmw_i2c                = pmac_i2c_do_rmw,
1406         .read_i2c_sub           = pmac_i2c_do_read_sub,
1407         .write_i2c_sub          = pmac_i2c_do_write_sub,
1408         .rmw_i2c_sub            = pmac_i2c_do_rmw_sub,
1409         .set_i2c_mode           = pmac_i2c_do_set_mode,
1410         .mask_and_compare       = pmac_i2c_do_mask_and_comp,
1411         .delay                  = pmac_i2c_do_delay,
1412 };
1413
1414 static void __init pmac_i2c_dev_create(struct device_node *np, int quirks)
1415 {
1416         DBG("dev_create(%s)\n", np->full_name);
1417
1418         pmf_register_driver(np, &pmac_i2c_pfunc_handlers,
1419                             (void *)(long)quirks);
1420 }
1421
1422 static void __init pmac_i2c_dev_init(struct device_node *np, int quirks)
1423 {
1424         DBG("dev_create(%s)\n", np->full_name);
1425
1426         pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_INIT, NULL);
1427 }
1428
1429 static void pmac_i2c_dev_suspend(struct device_node *np, int quirks)
1430 {
1431         DBG("dev_suspend(%s)\n", np->full_name);
1432         pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_SLEEP, NULL);
1433 }
1434
1435 static void pmac_i2c_dev_resume(struct device_node *np, int quirks)
1436 {
1437         DBG("dev_resume(%s)\n", np->full_name);
1438         pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_WAKE, NULL);
1439 }
1440
1441 void pmac_pfunc_i2c_suspend(void)
1442 {
1443         pmac_i2c_devscan(pmac_i2c_dev_suspend);
1444 }
1445
1446 void pmac_pfunc_i2c_resume(void)
1447 {
1448         pmac_i2c_devscan(pmac_i2c_dev_resume);
1449 }
1450
1451 /*
1452  * Initialize us: probe all i2c busses on the machine, instantiate
1453  * busses and platform functions as needed.
1454  */
1455 /* This is non-static as it might be called early by smp code */
1456 int __init pmac_i2c_init(void)
1457 {
1458         static int i2c_inited;
1459
1460         if (i2c_inited)
1461                 return 0;
1462         i2c_inited = 1;
1463
1464         if (!machine_is(powermac))
1465                 return 0;
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 arch_initcall(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 subsys_initcall(pmac_i2c_create_platform_devices);