1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Device driver for the Cuda and Egret system controllers found on PowerMacs
4 * and 68k Macs.
5 *
6 * The Cuda or Egret is a 6805 microcontroller interfaced to the 6522 VIA.
7 * This MCU controls system power, Parameter RAM, Real Time Clock and the
8 * Apple Desktop Bus (ADB) that connects to the keyboard and mouse.
9 *
10 * Copyright (C) 1996 Paul Mackerras.
11 */
12#include <linux/stdarg.h>
13#include <linux/types.h>
14#include <linux/errno.h>
15#include <linux/kernel.h>
16#include <linux/delay.h>
17#include <linux/adb.h>
18#include <linux/cuda.h>
19#include <linux/spinlock.h>
20#include <linux/interrupt.h>
21#include <linux/of_address.h>
22#include <linux/of_irq.h>
23
24#ifdef CONFIG_PPC
25#include <asm/machdep.h>
26#include <asm/pmac_feature.h>
27#else
28#include <asm/macintosh.h>
29#include <asm/macints.h>
30#include <asm/mac_via.h>
31#endif
32#include <asm/io.h>
33#include <linux/init.h>
34
35static volatile unsigned char __iomem *via;
36static DEFINE_SPINLOCK(cuda_lock);
37
38/* VIA registers - spaced 0x200 bytes apart */
39#define RS		0x200		/* skip between registers */
40#define B		0		/* B-side data */
41#define A		RS		/* A-side data */
42#define DIRB		(2*RS)		/* B-side direction (1=output) */
43#define DIRA		(3*RS)		/* A-side direction (1=output) */
44#define T1CL		(4*RS)		/* Timer 1 ctr/latch (low 8 bits) */
45#define T1CH		(5*RS)		/* Timer 1 counter (high 8 bits) */
46#define T1LL		(6*RS)		/* Timer 1 latch (low 8 bits) */
47#define T1LH		(7*RS)		/* Timer 1 latch (high 8 bits) */
48#define T2CL		(8*RS)		/* Timer 2 ctr/latch (low 8 bits) */
49#define T2CH		(9*RS)		/* Timer 2 counter (high 8 bits) */
50#define SR		(10*RS)		/* Shift register */
51#define ACR		(11*RS)		/* Auxiliary control register */
52#define PCR		(12*RS)		/* Peripheral control register */
53#define IFR		(13*RS)		/* Interrupt flag register */
54#define IER		(14*RS)		/* Interrupt enable register */
55#define ANH		(15*RS)		/* A-side data, no handshake */
56
57/*
58 * When the Cuda design replaced the Egret, some signal names and
59 * logic sense changed. They all serve the same purposes, however.
60 *
61 *   VIA pin       |  Egret pin
62 * ----------------+------------------------------------------
63 *   PB3 (input)   |  Transceiver session   (active low)
64 *   PB4 (output)  |  VIA full              (active high)
65 *   PB5 (output)  |  System session        (active high)
66 *
67 *   VIA pin       |  Cuda pin
68 * ----------------+------------------------------------------
69 *   PB3 (input)   |  Transfer request      (active low)
70 *   PB4 (output)  |  Byte acknowledge      (active low)
71 *   PB5 (output)  |  Transfer in progress  (active low)
72 */
73
74/* Bits in Port B data register */
75#define TREQ		0x08		/* Transfer request */
76#define TACK		0x10		/* Transfer acknowledge */
77#define TIP		0x20		/* Transfer in progress */
78
79/* Bits in ACR */
80#define SR_CTRL		0x1c		/* Shift register control bits */
81#define SR_EXT		0x0c		/* Shift on external clock */
82#define SR_OUT		0x10		/* Shift out if 1 */
83
84/* Bits in IFR and IER */
85#define IER_SET		0x80		/* set bits in IER */
86#define IER_CLR		0		/* clear bits in IER */
87#define SR_INT		0x04		/* Shift register full/empty */
88
89/* Duration of byte acknowledgement pulse (us) */
90#define EGRET_TACK_ASSERTED_DELAY	300
91#define EGRET_TACK_NEGATED_DELAY	400
92
93/* Interval from interrupt to start of session (us) */
94#define EGRET_SESSION_DELAY		450
95
96#ifdef CONFIG_PPC
97#define mcu_is_egret	false
98#else
99static bool mcu_is_egret;
100#endif
101
102static inline bool TREQ_asserted(u8 portb)
103{
104	return !(portb & TREQ);
105}
106
107static inline void assert_TIP(void)
108{
109	if (mcu_is_egret) {
110		udelay(EGRET_SESSION_DELAY);
111		out_8(&via[B], in_8(&via[B]) | TIP);
112	} else
113		out_8(&via[B], in_8(&via[B]) & ~TIP);
114}
115
116static inline void assert_TIP_and_TACK(void)
117{
118	if (mcu_is_egret) {
119		udelay(EGRET_SESSION_DELAY);
120		out_8(&via[B], in_8(&via[B]) | TIP | TACK);
121	} else
122		out_8(&via[B], in_8(&via[B]) & ~(TIP | TACK));
123}
124
125static inline void assert_TACK(void)
126{
127	if (mcu_is_egret) {
128		udelay(EGRET_TACK_NEGATED_DELAY);
129		out_8(&via[B], in_8(&via[B]) | TACK);
130	} else
131		out_8(&via[B], in_8(&via[B]) & ~TACK);
132}
133
134static inline void toggle_TACK(void)
135{
136	out_8(&via[B], in_8(&via[B]) ^ TACK);
137}
138
139static inline void negate_TACK(void)
140{
141	if (mcu_is_egret) {
142		udelay(EGRET_TACK_ASSERTED_DELAY);
143		out_8(&via[B], in_8(&via[B]) & ~TACK);
144	} else
145		out_8(&via[B], in_8(&via[B]) | TACK);
146}
147
148static inline void negate_TIP_and_TACK(void)
149{
150	if (mcu_is_egret) {
151		udelay(EGRET_TACK_ASSERTED_DELAY);
152		out_8(&via[B], in_8(&via[B]) & ~(TIP | TACK));
153	} else
154		out_8(&via[B], in_8(&via[B]) | TIP | TACK);
155}
156
157static enum cuda_state {
158    idle,
159    sent_first_byte,
160    sending,
161    reading,
162    read_done,
163    awaiting_reply
164} cuda_state;
165
166static struct adb_request *current_req;
167static struct adb_request *last_req;
168static unsigned char cuda_rbuf[16];
169static unsigned char *reply_ptr;
170static int reading_reply;
171static int data_index;
172static int cuda_irq;
173#ifdef CONFIG_PPC
174static struct device_node *vias;
175#endif
176static int cuda_fully_inited;
177
178#ifdef CONFIG_ADB
179static int cuda_probe(void);
180static int cuda_send_request(struct adb_request *req, int sync);
181static int cuda_adb_autopoll(int devs);
182static int cuda_reset_adb_bus(void);
183#endif /* CONFIG_ADB */
184
185static int cuda_init_via(void);
186static void cuda_start(void);
187static irqreturn_t cuda_interrupt(int irq, void *arg);
188static void cuda_input(unsigned char *buf, int nb);
189void cuda_poll(void);
190static int cuda_write(struct adb_request *req);
191
192int cuda_request(struct adb_request *req,
193		 void (*done)(struct adb_request *), int nbytes, ...);
194
195#ifdef CONFIG_ADB
196struct adb_driver via_cuda_driver = {
197	.name         = "CUDA",
198	.probe        = cuda_probe,
199	.send_request = cuda_send_request,
200	.autopoll     = cuda_adb_autopoll,
201	.poll         = cuda_poll,
202	.reset_bus    = cuda_reset_adb_bus,
203};
204#endif /* CONFIG_ADB */
205
206#ifdef CONFIG_MAC
207int __init find_via_cuda(void)
208{
209    struct adb_request req;
210    int err;
211
212    if (macintosh_config->adb_type != MAC_ADB_CUDA &&
213        macintosh_config->adb_type != MAC_ADB_EGRET)
214	return 0;
215
216    via = via1;
217    cuda_state = idle;
218    mcu_is_egret = macintosh_config->adb_type == MAC_ADB_EGRET;
219
220    err = cuda_init_via();
221    if (err) {
222	printk(KERN_ERR "cuda_init_via() failed\n");
223	via = NULL;
224	return 0;
225    }
226
227    /* enable autopoll */
228    cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
229    while (!req.complete)
230	cuda_poll();
231
232    return 1;
233}
234#else
235int __init find_via_cuda(void)
236{
237    struct adb_request req;
238    struct resource res;
239    int err;
240
241    if (vias)
242	return 1;
243    vias = of_find_node_by_name(NULL, "via-cuda");
244    if (!vias)
245	return 0;
246
247    err = of_address_to_resource(vias, 0, &res);
248    if (err) {
249	    printk(KERN_ERR "via-cuda: Error getting \"reg\" property !\n");
250	    goto fail;
251    }
252    via = ioremap(res.start, 0x2000);
253    if (via == NULL) {
254	    printk(KERN_ERR "via-cuda: Can't map address !\n");
255	    goto fail;
256    }
257
258    cuda_state = idle;
259    sys_ctrler = SYS_CTRLER_CUDA;
260
261    err = cuda_init_via();
262    if (err) {
263	printk(KERN_ERR "cuda_init_via() failed\n");
264	via = NULL;
265	return 0;
266    }
267
268    /* Clear and enable interrupts, but only on PPC. On 68K it's done  */
269    /* for us by the main VIA driver in arch/m68k/mac/via.c        */
270
271    out_8(&via[IFR], 0x7f);	/* clear interrupts by writing 1s */
272    out_8(&via[IER], IER_SET|SR_INT); /* enable interrupt from SR */
273
274    /* enable autopoll */
275    cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
276    while (!req.complete)
277	cuda_poll();
278
279    return 1;
280
281 fail:
282    of_node_put(vias);
283    vias = NULL;
284    return 0;
285}
286#endif /* !defined CONFIG_MAC */
287
288static int __init via_cuda_start(void)
289{
290    if (via == NULL)
291	return -ENODEV;
292
293#ifdef CONFIG_MAC
294    cuda_irq = IRQ_MAC_ADB;
295#else
296    cuda_irq = irq_of_parse_and_map(vias, 0);
297    if (!cuda_irq) {
298	printk(KERN_ERR "via-cuda: can't map interrupts for %pOF\n",
299	       vias);
300	return -ENODEV;
301    }
302#endif
303
304    if (request_irq(cuda_irq, cuda_interrupt, 0, "ADB", cuda_interrupt)) {
305	printk(KERN_ERR "via-cuda: can't request irq %d\n", cuda_irq);
306	return -EAGAIN;
307    }
308
309    pr_info("Macintosh Cuda and Egret driver.\n");
310
311    cuda_fully_inited = 1;
312    return 0;
313}
314
315device_initcall(via_cuda_start);
316
317#ifdef CONFIG_ADB
318static int
319cuda_probe(void)
320{
321#ifdef CONFIG_PPC
322    if (sys_ctrler != SYS_CTRLER_CUDA)
323	return -ENODEV;
324#else
325    if (macintosh_config->adb_type != MAC_ADB_CUDA &&
326        macintosh_config->adb_type != MAC_ADB_EGRET)
327	return -ENODEV;
328#endif
329    if (via == NULL)
330	return -ENODEV;
331    return 0;
332}
333#endif /* CONFIG_ADB */
334
335static int __init sync_egret(void)
336{
337	if (TREQ_asserted(in_8(&via[B]))) {
338		/* Complete the inbound transfer */
339		assert_TIP_and_TACK();
340		while (1) {
341			negate_TACK();
342			mdelay(1);
343			(void)in_8(&via[SR]);
344			assert_TACK();
345			if (!TREQ_asserted(in_8(&via[B])))
346				break;
347		}
348		negate_TIP_and_TACK();
349	} else if (in_8(&via[B]) & TIP) {
350		/* Terminate the outbound transfer */
351		negate_TACK();
352		assert_TACK();
353		mdelay(1);
354		negate_TIP_and_TACK();
355	}
356	/* Clear shift register interrupt */
357	if (in_8(&via[IFR]) & SR_INT)
358		(void)in_8(&via[SR]);
359	return 0;
360}
361
362#define WAIT_FOR(cond, what)					\
363    do {                                                        \
364    	int x;							\
365	for (x = 1000; !(cond); --x) {				\
366	    if (x == 0) {					\
367		pr_err("Timeout waiting for " what "\n");	\
368		return -ENXIO;					\
369	    }							\
370	    udelay(100);					\
371	}							\
372    } while (0)
373
374static int
375__init cuda_init_via(void)
376{
377#ifdef CONFIG_PPC
378    out_8(&via[IER], 0x7f);					/* disable interrupts from VIA */
379    (void)in_8(&via[IER]);
380#else
381    out_8(&via[IER], SR_INT);					/* disable SR interrupt from VIA */
382#endif
383
384    out_8(&via[DIRB], (in_8(&via[DIRB]) | TACK | TIP) & ~TREQ);	/* TACK & TIP out */
385    out_8(&via[ACR], (in_8(&via[ACR]) & ~SR_CTRL) | SR_EXT);	/* SR data in */
386    (void)in_8(&via[SR]);					/* clear any left-over data */
387
388    if (mcu_is_egret)
389	return sync_egret();
390
391    negate_TIP_and_TACK();
392
393    /* delay 4ms and then clear any pending interrupt */
394    mdelay(4);
395    (void)in_8(&via[SR]);
396    out_8(&via[IFR], SR_INT);
397
398    /* sync with the CUDA - assert TACK without TIP */
399    assert_TACK();
400
401    /* wait for the CUDA to assert TREQ in response */
402    WAIT_FOR(TREQ_asserted(in_8(&via[B])), "CUDA response to sync");
403
404    /* wait for the interrupt and then clear it */
405    WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (2)");
406    (void)in_8(&via[SR]);
407    out_8(&via[IFR], SR_INT);
408
409    /* finish the sync by negating TACK */
410    negate_TACK();
411
412    /* wait for the CUDA to negate TREQ and the corresponding interrupt */
413    WAIT_FOR(!TREQ_asserted(in_8(&via[B])), "CUDA response to sync (3)");
414    WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (4)");
415    (void)in_8(&via[SR]);
416    out_8(&via[IFR], SR_INT);
417
418    return 0;
419}
420
421#ifdef CONFIG_ADB
422/* Send an ADB command */
423static int
424cuda_send_request(struct adb_request *req, int sync)
425{
426    int i;
427
428    if ((via == NULL) || !cuda_fully_inited) {
429	req->complete = 1;
430	return -ENXIO;
431    }
432
433    req->reply_expected = 1;
434
435    i = cuda_write(req);
436    if (i)
437	return i;
438
439    if (sync) {
440	while (!req->complete)
441	    cuda_poll();
442    }
443    return 0;
444}
445
446
447/* Enable/disable autopolling */
448static int
449cuda_adb_autopoll(int devs)
450{
451    struct adb_request req;
452
453    if ((via == NULL) || !cuda_fully_inited)
454	return -ENXIO;
455
456    cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, (devs? 1: 0));
457    while (!req.complete)
458	cuda_poll();
459    return 0;
460}
461
462/* Reset adb bus - how do we do this?? */
463static int
464cuda_reset_adb_bus(void)
465{
466    struct adb_request req;
467
468    if ((via == NULL) || !cuda_fully_inited)
469	return -ENXIO;
470
471    cuda_request(&req, NULL, 2, ADB_PACKET, 0);		/* maybe? */
472    while (!req.complete)
473	cuda_poll();
474    return 0;
475}
476#endif /* CONFIG_ADB */
477
478/* Construct and send a cuda request */
479int
480cuda_request(struct adb_request *req, void (*done)(struct adb_request *),
481	     int nbytes, ...)
482{
483    va_list list;
484    int i;
485
486    if (via == NULL) {
487	req->complete = 1;
488	return -ENXIO;
489    }
490
491    req->nbytes = nbytes;
492    req->done = done;
493    va_start(list, nbytes);
494    for (i = 0; i < nbytes; ++i)
495	req->data[i] = va_arg(list, int);
496    va_end(list);
497    req->reply_expected = 1;
498    return cuda_write(req);
499}
500EXPORT_SYMBOL(cuda_request);
501
502static int
503cuda_write(struct adb_request *req)
504{
505    unsigned long flags;
506
507    if (req->nbytes < 2 || req->data[0] > CUDA_PACKET) {
508	req->complete = 1;
509	return -EINVAL;
510    }
511    req->next = NULL;
512    req->sent = 0;
513    req->complete = 0;
514    req->reply_len = 0;
515
516    spin_lock_irqsave(&cuda_lock, flags);
517    if (current_req) {
518	last_req->next = req;
519	last_req = req;
520    } else {
521	current_req = req;
522	last_req = req;
523	if (cuda_state == idle)
524	    cuda_start();
525    }
526    spin_unlock_irqrestore(&cuda_lock, flags);
527
528    return 0;
529}
530
531static void
532cuda_start(void)
533{
534    /* assert cuda_state == idle */
535    if (current_req == NULL)
536	return;
537    data_index = 0;
538    if (TREQ_asserted(in_8(&via[B])))
539	return;			/* a byte is coming in from the CUDA */
540
541    /* set the shift register to shift out and send a byte */
542    out_8(&via[ACR], in_8(&via[ACR]) | SR_OUT);
543    out_8(&via[SR], current_req->data[data_index++]);
544    if (mcu_is_egret)
545	assert_TIP_and_TACK();
546    else
547	assert_TIP();
548    cuda_state = sent_first_byte;
549}
550
551void
552cuda_poll(void)
553{
554	cuda_interrupt(0, NULL);
555}
556EXPORT_SYMBOL(cuda_poll);
557
558#define ARRAY_FULL(a, p)	((p) - (a) == ARRAY_SIZE(a))
559
560static irqreturn_t
561cuda_interrupt(int irq, void *arg)
562{
563    unsigned long flags;
564    u8 status;
565    struct adb_request *req = NULL;
566    unsigned char ibuf[16];
567    int ibuf_len = 0;
568    int complete = 0;
569    bool full;
570
571    spin_lock_irqsave(&cuda_lock, flags);
572
573    /* On powermacs, this handler is registered for the VIA IRQ. But they use
574     * just the shift register IRQ -- other VIA interrupt sources are disabled.
575     * On m68k macs, the VIA IRQ sources are dispatched individually. Unless
576     * we are polling, the shift register IRQ flag has already been cleared.
577     */
578
579#ifdef CONFIG_MAC
580    if (!arg)
581#endif
582    {
583        if ((in_8(&via[IFR]) & SR_INT) == 0) {
584            spin_unlock_irqrestore(&cuda_lock, flags);
585            return IRQ_NONE;
586        } else {
587            out_8(&via[IFR], SR_INT);
588        }
589    }
590
591    status = in_8(&via[B]) & (TIP | TACK | TREQ);
592
593    switch (cuda_state) {
594    case idle:
595	/* System controller has unsolicited data for us */
596	(void)in_8(&via[SR]);
597idle_state:
598	assert_TIP();
599	cuda_state = reading;
600	reply_ptr = cuda_rbuf;
601	reading_reply = 0;
602	break;
603
604    case awaiting_reply:
605	/* System controller has reply data for us */
606	(void)in_8(&via[SR]);
607	assert_TIP();
608	cuda_state = reading;
609	reply_ptr = current_req->reply;
610	reading_reply = 1;
611	break;
612
613    case sent_first_byte:
614	if (TREQ_asserted(status)) {
615	    /* collision */
616	    out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
617	    (void)in_8(&via[SR]);
618	    negate_TIP_and_TACK();
619	    cuda_state = idle;
620	    /* Egret does not raise an "aborted" interrupt */
621	    if (mcu_is_egret)
622		goto idle_state;
623	} else {
624	    out_8(&via[SR], current_req->data[data_index++]);
625	    toggle_TACK();
626	    if (mcu_is_egret)
627		assert_TACK();
628	    cuda_state = sending;
629	}
630	break;
631
632    case sending:
633	req = current_req;
634	if (data_index >= req->nbytes) {
635	    out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
636	    (void)in_8(&via[SR]);
637	    negate_TIP_and_TACK();
638	    req->sent = 1;
639	    if (req->reply_expected) {
640		cuda_state = awaiting_reply;
641	    } else {
642		current_req = req->next;
643		complete = 1;
644		/* not sure about this */
645		cuda_state = idle;
646		cuda_start();
647	    }
648	} else {
649	    out_8(&via[SR], req->data[data_index++]);
650	    toggle_TACK();
651	    if (mcu_is_egret)
652		assert_TACK();
653	}
654	break;
655
656    case reading:
657	full = reading_reply ? ARRAY_FULL(current_req->reply, reply_ptr)
658	                     : ARRAY_FULL(cuda_rbuf, reply_ptr);
659	if (full)
660	    (void)in_8(&via[SR]);
661	else
662	    *reply_ptr++ = in_8(&via[SR]);
663	if (!TREQ_asserted(status) || full) {
664	    if (mcu_is_egret)
665		assert_TACK();
666	    /* that's all folks */
667	    negate_TIP_and_TACK();
668	    cuda_state = read_done;
669	    /* Egret does not raise a "read done" interrupt */
670	    if (mcu_is_egret)
671		goto read_done_state;
672	} else {
673	    toggle_TACK();
674	    if (mcu_is_egret)
675		negate_TACK();
676	}
677	break;
678
679    case read_done:
680	(void)in_8(&via[SR]);
681read_done_state:
682	if (reading_reply) {
683	    req = current_req;
684	    req->reply_len = reply_ptr - req->reply;
685	    if (req->data[0] == ADB_PACKET) {
686		/* Have to adjust the reply from ADB commands */
687		if (req->reply_len <= 2 || (req->reply[1] & 2) != 0) {
688		    /* the 0x2 bit indicates no response */
689		    req->reply_len = 0;
690		} else {
691		    /* leave just the command and result bytes in the reply */
692		    req->reply_len -= 2;
693		    memmove(req->reply, req->reply + 2, req->reply_len);
694		}
695	    }
696	    current_req = req->next;
697	    complete = 1;
698	    reading_reply = 0;
699	} else {
700	    /* This is tricky. We must break the spinlock to call
701	     * cuda_input. However, doing so means we might get
702	     * re-entered from another CPU getting an interrupt
703	     * or calling cuda_poll(). I ended up using the stack
704	     * (it's only for 16 bytes) and moving the actual
705	     * call to cuda_input to outside of the lock.
706	     */
707	    ibuf_len = reply_ptr - cuda_rbuf;
708	    memcpy(ibuf, cuda_rbuf, ibuf_len);
709	}
710	reply_ptr = cuda_rbuf;
711	cuda_state = idle;
712	cuda_start();
713	if (cuda_state == idle && TREQ_asserted(in_8(&via[B]))) {
714	    assert_TIP();
715	    cuda_state = reading;
716	}
717	break;
718
719    default:
720	pr_err("cuda_interrupt: unknown cuda_state %d?\n", cuda_state);
721    }
722    spin_unlock_irqrestore(&cuda_lock, flags);
723    if (complete && req) {
724    	void (*done)(struct adb_request *) = req->done;
725    	mb();
726    	req->complete = 1;
727    	/* Here, we assume that if the request has a done member, the
728    	 * struct request will survive to setting req->complete to 1
729    	 */
730    	if (done)
731		(*done)(req);
732    }
733    if (ibuf_len)
734	cuda_input(ibuf, ibuf_len);
735    return IRQ_HANDLED;
736}
737
738static void
739cuda_input(unsigned char *buf, int nb)
740{
741    switch (buf[0]) {
742    case ADB_PACKET:
743#ifdef CONFIG_XMON
744	if (nb == 5 && buf[2] == 0x2c) {
745	    extern int xmon_wants_key, xmon_adb_keycode;
746	    if (xmon_wants_key) {
747		xmon_adb_keycode = buf[3];
748		return;
749	    }
750	}
751#endif /* CONFIG_XMON */
752#ifdef CONFIG_ADB
753	adb_input(buf+2, nb-2, buf[1] & 0x40);
754#endif /* CONFIG_ADB */
755	break;
756
757    case TIMER_PACKET:
758	/* Egret sends these periodically. Might be useful as a 'heartbeat'
759	 * to trigger a recovery for the VIA shift register errata.
760	 */
761	break;
762
763    default:
764	print_hex_dump(KERN_INFO, "cuda_input: ", DUMP_PREFIX_NONE, 32, 1,
765	               buf, nb, false);
766    }
767}
768
769/* Offset between Unix time (1970-based) and Mac time (1904-based) */
770#define RTC_OFFSET	2082844800
771
772time64_t cuda_get_time(void)
773{
774	struct adb_request req;
775	u32 now;
776
777	if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
778		return 0;
779	while (!req.complete)
780		cuda_poll();
781	if (req.reply_len != 7)
782		pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
783	now = (req.reply[3] << 24) + (req.reply[4] << 16) +
784	      (req.reply[5] << 8) + req.reply[6];
785	return (time64_t)now - RTC_OFFSET;
786}
787
788int cuda_set_rtc_time(struct rtc_time *tm)
789{
790	u32 now;
791	struct adb_request req;
792
793	now = lower_32_bits(rtc_tm_to_time64(tm) + RTC_OFFSET);
794	if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
795	                 now >> 24, now >> 16, now >> 8, now) < 0)
796		return -ENXIO;
797	while (!req.complete)
798		cuda_poll();
799	if ((req.reply_len != 3) && (req.reply_len != 7))
800		pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
801	return 0;
802}
803