1 // SPDX-License-Identifier: GPL-2.0
6  *	via them as are assorted bits and bobs - eg RTC, ADB.
14  * for info.  A full-text web search on 6522 AND VIA will probably also
53  * _consistently_ lazy?                          - 1999-05-21 (jmt)
61  * Quadra-like ASICs. (RBV and OSS machines don't have this limitation.)
65  * (at least) the Quadra 700. A NuBus card's /NMRQ signal is an open-collector
66  * circuit (see Designing Cards and Drivers for Macintosh II and Macintosh SE,
67  * p. 10-11 etc) but VIA outputs are not (see datasheet).
80  * and therefore no interrupt, even after being re-enabled.
93  * limitation, "Designing Cards and Drivers", p. 9-8, says that a slot
120 		switch (macintosh_config->via_type) {  in via_init()
128 			if (macintosh_config->ident == MAC_MODEL_LCIII) {  in via_init()
180 	 * SE/30: disable video IRQ  in via_init()
183 	if (macintosh_config->ident == MAC_MODEL_SE30) {  in via_init()
188 	switch (macintosh_config->adb_type) {  in via_init()
206 	if ((macintosh_config->via_type == MAC_VIA_QUADRA) &&  in via_init()
207 	    (macintosh_config->adb_type != MAC_ADB_PB1) &&  in via_init()
208 	    (macintosh_config->adb_type != MAC_ADB_PB2) &&  in via_init()
209 	    (macintosh_config->ident    != MAC_MODEL_C660) &&  in via_init()
210 	    (macintosh_config->ident    != MAC_MODEL_Q840)) {  in via_init()
247 	 * Testing reveals that PowerBooks do too. However, the SE/30  in via_init()
252 	if (macintosh_config->via_type == MAC_VIA_II) {  in via_init()
256 		/* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, neg. edge */  in via_init()
290  * the system into 24-bit mode for an instant.
311 	if ((macintosh_config->adb_type != MAC_ADB_PB1) &&  in via_nubus_init()
312 	    (macintosh_config->adb_type != MAC_ADB_PB2)) {  in via_nubus_init()
313 		/* set the line to be an output on non-RBV machines */  in via_nubus_init()
318 		/* according to MkLinux.  -- jmt               */  in via_nubus_init()
327 	switch (macintosh_config->via_type) {  in via_nubus_init()
343 	switch (macintosh_config->via_type) {  in via_nubus_irq_startup()
347 		if (macintosh_config->via_type == MAC_VIA_II) {  in via_nubus_irq_startup()
363 	switch (macintosh_config->via_type) {  in via_nubus_irq_shutdown()
377  * via6522.c :-), disable/pending masks added.
465 			--slot_irq;  in via_nubus_irq()
507 		switch (macintosh_config->via_type) {  in via_irq_enable()
534 		switch (macintosh_config->via_type) {  in via_irq_disable()
568 #define VIA_TC             (VIA_TIMER_CYCLES - 2) /* including 0 and -1 */
616 	 * Timer counter wrap-around is detected with the timer interrupt flag  in mac_read_clk()
631 	ticks = VIA_TIMER_CYCLES - count;  in mac_read_clk()