1 // SPDX-License-Identifier: GPL-2.0
7  * This MCU controls system power, Parameter RAM, Real Time Clock and the
35 /* VIA registers - spaced 0x200 bytes apart */
37 #define B		0		/* B-side data */
38 #define A		RS		/* A-side data */
39 #define DIRB		(2*RS)		/* B-side direction (1=output) */
40 #define DIRA		(3*RS)		/* A-side direction (1=output) */
52 #define ANH		(15*RS)		/* A-side data, no handshake */
58  *   VIA pin       |  Egret pin
59  * ----------------+------------------------------------------
64  *   VIA pin       |  Cuda pin
65  * ----------------+------------------------------------------
209     if (macintosh_config->adb_type != MAC_ADB_CUDA &&  in find_via_cuda()
210         macintosh_config->adb_type != MAC_ADB_EGRET)  in find_via_cuda()
215     mcu_is_egret = macintosh_config->adb_type == MAC_ADB_EGRET;  in find_via_cuda()
241     vias = of_find_node_by_name(NULL, "via-cuda");  in find_via_cuda()
247 	    printk(KERN_ERR "via-cuda: No \"reg\" property !\n");  in find_via_cuda()
252 	    printk(KERN_ERR "via-cuda: Can't translate address !\n");  in find_via_cuda()
257 	    printk(KERN_ERR "via-cuda: Can't map address !\n");  in find_via_cuda()
294 	return -ENODEV;  in via_cuda_start()
301 	printk(KERN_ERR "via-cuda: can't map interrupts for %pOF\n",  in via_cuda_start()
303 	return -ENODEV;  in via_cuda_start()
308 	printk(KERN_ERR "via-cuda: can't request irq %d\n", cuda_irq);  in via_cuda_start()
309 	return -EAGAIN;  in via_cuda_start()
326 	return -ENODEV;  in cuda_probe()
328     if (macintosh_config->adb_type != MAC_ADB_CUDA &&  in cuda_probe()
329         macintosh_config->adb_type != MAC_ADB_EGRET)  in cuda_probe()
330 	return -ENODEV;  in cuda_probe()
333 	return -ENODEV;  in cuda_probe()
368 	for (x = 1000; !(cond); --x) {				\
371 		return -ENXIO;					\
389     (void)in_8(&via[SR]);					/* clear any left-over data */  in cuda_init_via()
396     /* delay 4ms and then clear any pending interrupt */  in cuda_init_via()
401     /* sync with the CUDA - assert TACK without TIP */  in cuda_init_via()
404     /* wait for the CUDA to assert TREQ in response */  in cuda_init_via()
432 	req->complete = 1;  in cuda_send_request()
433 	return -ENXIO;  in cuda_send_request()
436     req->reply_expected = 1;  in cuda_send_request()
443 	while (!req->complete)  in cuda_send_request()
457 	return -ENXIO;  in cuda_adb_autopoll()
465 /* Reset adb bus - how do we do this?? */
472 	return -ENXIO;  in cuda_reset_adb_bus()
490 	req->complete = 1;  in cuda_request()
491 	return -ENXIO;  in cuda_request()
494     req->nbytes = nbytes;  in cuda_request()
495     req->done = done;  in cuda_request()
498 	req->data[i] = va_arg(list, int);  in cuda_request()
500     req->reply_expected = 1;  in cuda_request()
510     if (req->nbytes < 2 || req->data[0] > CUDA_PACKET) {  in cuda_write()
511 	req->complete = 1;  in cuda_write()
512 	return -EINVAL;  in cuda_write()
514     req->next = NULL;  in cuda_write()
515     req->sent = 0;  in cuda_write()
516     req->complete = 0;  in cuda_write()
517     req->reply_len = 0;  in cuda_write()
521 	last_req->next = req;  in cuda_write()
537     /* assert cuda_state == idle */  in cuda_start()
546     out_8(&via[SR], current_req->data[data_index++]);  in cuda_start()
561 #define ARRAY_FULL(a, p)	((p) - (a) == ARRAY_SIZE(a))
577      * just the shift register IRQ -- other VIA interrupt sources are disabled.  in cuda_interrupt()
612 	reply_ptr = current_req->reply;  in cuda_interrupt()
627 	    out_8(&via[SR], current_req->data[data_index++]);  in cuda_interrupt()
637 	if (data_index >= req->nbytes) {  in cuda_interrupt()
641 	    req->sent = 1;  in cuda_interrupt()
642 	    if (req->reply_expected) {  in cuda_interrupt()
645 		current_req = req->next;  in cuda_interrupt()
652 	    out_8(&via[SR], req->data[data_index++]);  in cuda_interrupt()
660 	full = reading_reply ? ARRAY_FULL(current_req->reply, reply_ptr)  in cuda_interrupt()
687 	    req->reply_len = reply_ptr - req->reply;  in cuda_interrupt()
688 	    if (req->data[0] == ADB_PACKET) {  in cuda_interrupt()
690 		if (req->reply_len <= 2 || (req->reply[1] & 2) != 0) {  in cuda_interrupt()
692 		    req->reply_len = 0;  in cuda_interrupt()
695 		    req->reply_len -= 2;  in cuda_interrupt()
696 		    memmove(req->reply, req->reply + 2, req->reply_len);  in cuda_interrupt()
699 	    current_req = req->next;  in cuda_interrupt()
705 	     * re-entered from another CPU getting an interrupt  in cuda_interrupt()
710 	    ibuf_len = reply_ptr - cuda_rbuf;  in cuda_interrupt()
727     	void (*done)(struct adb_request *) = req->done;  in cuda_interrupt()
729     	req->complete = 1;  in cuda_interrupt()
731     	 * struct request will survive to setting req->complete to 1  in cuda_interrupt()
756 	adb_input(buf+2, nb-2, buf[1] & 0x40);  in cuda_input()
772 /* Offset between Unix time (1970-based) and Mac time (1904-based) */
788 	return (time64_t)now - RTC_OFFSET;  in cuda_get_time()
799 		return -ENXIO;  in cuda_set_rtc_time()