1 // SPDX-License-Identifier: GPL-2.0
38 /* VIA registers - spaced 0x200 bytes apart */
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) */
46 #define T1LL		(6*RS)		/* Timer 1 latch (low 8 bits) */
48 #define T2CL		(8*RS)		/* Timer 2 ctr/latch (low 8 bits) */
55 #define ANH		(15*RS)		/* A-side data, no handshake */
62  * ----------------+------------------------------------------
63  *   PB3 (input)   |  Transceiver session   (active low)
68  * ----------------+------------------------------------------
69  *   PB3 (input)   |  Transfer request      (active low)
70  *   PB4 (output)  |  Byte acknowledge      (active low)
71  *   PB5 (output)  |  Transfer in progress  (active low)
212     if (macintosh_config->adb_type != MAC_ADB_CUDA &&  in find_via_cuda()
213         macintosh_config->adb_type != MAC_ADB_EGRET)  in find_via_cuda()
218     mcu_is_egret = macintosh_config->adb_type == MAC_ADB_EGRET;  in find_via_cuda()
243     vias = of_find_node_by_name(NULL, "via-cuda");  in find_via_cuda()
249 	    printk(KERN_ERR "via-cuda: Error getting \"reg\" property !\n");  in find_via_cuda()
254 	    printk(KERN_ERR "via-cuda: Can't map address !\n");  in find_via_cuda()
291 	return -ENODEV;  in via_cuda_start()
298 	printk(KERN_ERR "via-cuda: can't map interrupts for %pOF\n",  in via_cuda_start()
300 	return -ENODEV;  in via_cuda_start()
305 	printk(KERN_ERR "via-cuda: can't request irq %d\n", cuda_irq);  in via_cuda_start()
306 	return -EAGAIN;  in via_cuda_start()
323 	return -ENODEV;  in cuda_probe()
325     if (macintosh_config->adb_type != MAC_ADB_CUDA &&  in cuda_probe()
326         macintosh_config->adb_type != MAC_ADB_EGRET)  in cuda_probe()
327 	return -ENODEV;  in cuda_probe()
330 	return -ENODEV;  in cuda_probe()
365 	for (x = 1000; !(cond); --x) {				\
368 		return -ENXIO;					\
386     (void)in_8(&via[SR]);					/* clear any left-over data */  in cuda_init_via()
398     /* sync with the CUDA - assert TACK without TIP */  in cuda_init_via()
429 	req->complete = 1;  in cuda_send_request()
430 	return -ENXIO;  in cuda_send_request()
433     req->reply_expected = 1;  in cuda_send_request()
440 	while (!req->complete)  in cuda_send_request()
454 	return -ENXIO;  in cuda_adb_autopoll()
462 /* Reset adb bus - how do we do this?? */
469 	return -ENXIO;  in cuda_reset_adb_bus()
487 	req->complete = 1;  in cuda_request()
488 	return -ENXIO;  in cuda_request()
491     req->nbytes = nbytes;  in cuda_request()
492     req->done = done;  in cuda_request()
495 	req->data[i] = va_arg(list, int);  in cuda_request()
497     req->reply_expected = 1;  in cuda_request()
507     if (req->nbytes < 2 || req->data[0] > CUDA_PACKET) {  in cuda_write()
508 	req->complete = 1;  in cuda_write()
509 	return -EINVAL;  in cuda_write()
511     req->next = NULL;  in cuda_write()
512     req->sent = 0;  in cuda_write()
513     req->complete = 0;  in cuda_write()
514     req->reply_len = 0;  in cuda_write()
518 	last_req->next = req;  in cuda_write()
543     out_8(&via[SR], current_req->data[data_index++]);  in cuda_start()
558 #define ARRAY_FULL(a, p)	((p) - (a) == ARRAY_SIZE(a))
574      * just the shift register IRQ -- other VIA interrupt sources are disabled.  in cuda_interrupt()
609 	reply_ptr = current_req->reply;  in cuda_interrupt()
624 	    out_8(&via[SR], current_req->data[data_index++]);  in cuda_interrupt()
634 	if (data_index >= req->nbytes) {  in cuda_interrupt()
638 	    req->sent = 1;  in cuda_interrupt()
639 	    if (req->reply_expected) {  in cuda_interrupt()
642 		current_req = req->next;  in cuda_interrupt()
649 	    out_8(&via[SR], req->data[data_index++]);  in cuda_interrupt()
657 	full = reading_reply ? ARRAY_FULL(current_req->reply, reply_ptr)  in cuda_interrupt()
684 	    req->reply_len = reply_ptr - req->reply;  in cuda_interrupt()
685 	    if (req->data[0] == ADB_PACKET) {  in cuda_interrupt()
687 		if (req->reply_len <= 2 || (req->reply[1] & 2) != 0) {  in cuda_interrupt()
689 		    req->reply_len = 0;  in cuda_interrupt()
692 		    req->reply_len -= 2;  in cuda_interrupt()
693 		    memmove(req->reply, req->reply + 2, req->reply_len);  in cuda_interrupt()
696 	    current_req = req->next;  in cuda_interrupt()
702 	     * re-entered from another CPU getting an interrupt  in cuda_interrupt()
707 	    ibuf_len = reply_ptr - cuda_rbuf;  in cuda_interrupt()
724     	void (*done)(struct adb_request *) = req->done;  in cuda_interrupt()
726     	req->complete = 1;  in cuda_interrupt()
728     	 * struct request will survive to setting req->complete to 1  in cuda_interrupt()
753 	adb_input(buf+2, nb-2, buf[1] & 0x40);  in cuda_input()
769 /* Offset between Unix time (1970-based) and Mac time (1904-based) */
785 	return (time64_t)now - RTC_OFFSET;  in cuda_get_time()
796 		return -ENXIO;  in cuda_set_rtc_time()