mirror of https://gitee.com/openkylin/linux.git
658 lines
16 KiB
C
658 lines
16 KiB
C
/*
|
|
* 6522 Versatile Interface Adapter (VIA)
|
|
*
|
|
* There are two of these on the Mac II. Some IRQs are vectored
|
|
* via them as are assorted bits and bobs - eg RTC, ADB.
|
|
*
|
|
* CSA: Motorola seems to have removed documentation on the 6522 from
|
|
* their web site; try
|
|
* http://nerini.drf.com/vectrex/other/text/chips/6522/
|
|
* http://www.zymurgy.net/classic/vic20/vicdet1.htm
|
|
* and
|
|
* http://193.23.168.87/mikro_laborversuche/via_iobaustein/via6522_1.html
|
|
* for info. A full-text web search on 6522 AND VIA will probably also
|
|
* net some usefulness. <cananian@alumni.princeton.edu> 20apr1999
|
|
*
|
|
* Additional data is here (the SY6522 was used in the Mac II etc):
|
|
* http://www.6502.org/documents/datasheets/synertek/synertek_sy6522.pdf
|
|
* http://www.6502.org/documents/datasheets/synertek/synertek_sy6522_programming_reference.pdf
|
|
*
|
|
* PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b
|
|
* by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org)
|
|
*
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/ide.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/macintosh.h>
|
|
#include <asm/macints.h>
|
|
#include <asm/machw.h>
|
|
#include <asm/mac_via.h>
|
|
#include <asm/mac_psc.h>
|
|
|
|
volatile __u8 *via1, *via2;
|
|
#if 0
|
|
/* See note in mac_via.h about how this is possibly not useful */
|
|
volatile long *via_memory_bogon=(long *)&via_memory_bogon;
|
|
#endif
|
|
int rbv_present;
|
|
int via_alt_mapping;
|
|
EXPORT_SYMBOL(via_alt_mapping);
|
|
__u8 rbv_clear;
|
|
|
|
/*
|
|
* Globals for accessing the VIA chip registers without having to
|
|
* check if we're hitting a real VIA or an RBV. Normally you could
|
|
* just hit the combined register (ie, vIER|rIER) but that seems to
|
|
* break on AV Macs...probably because they actually decode more than
|
|
* eight address bits. Why can't Apple engineers at least be
|
|
* _consistently_ lazy? - 1999-05-21 (jmt)
|
|
*/
|
|
|
|
static int gIER,gIFR,gBufA,gBufB;
|
|
|
|
/*
|
|
* Timer defs.
|
|
*/
|
|
|
|
#define TICK_SIZE 10000
|
|
#define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */
|
|
#define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF)
|
|
#define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8)
|
|
|
|
/* To disable a NuBus slot on Quadras we make the slot IRQ lines outputs, set
|
|
* high. On RBV we just use the slot interrupt enable register. On Macs with
|
|
* genuine VIA chips we must use nubus_disabled to keep track of disabled slot
|
|
* interrupts. When any slot IRQ is disabled we mask the (edge triggered) CA1
|
|
* or "SLOTS" interrupt. When no slot is disabled, we unmask the CA1 interrupt.
|
|
* So, on genuine VIAs, having more than one NuBus IRQ can mean trouble,
|
|
* because closing one of those drivers can mask all of the NuBus interrupts.
|
|
* Also, since we can't mask the unregistered slot IRQs on genuine VIAs, it's
|
|
* possible to get interrupts from cards that MacOS or the ROM has configured
|
|
* but we have not. FWIW, "Designing Cards and Drivers for Macintosh II and
|
|
* Macintosh SE", page 9-8, says, a slot IRQ with no driver would crash MacOS.
|
|
*/
|
|
static u8 nubus_disabled;
|
|
|
|
void via_debug_dump(void);
|
|
irqreturn_t via1_irq(int, void *);
|
|
irqreturn_t via2_irq(int, void *);
|
|
irqreturn_t via_nubus_irq(int, void *);
|
|
void via_irq_enable(int irq);
|
|
void via_irq_disable(int irq);
|
|
void via_irq_clear(int irq);
|
|
|
|
extern irqreturn_t mac_scc_dispatch(int, void *);
|
|
extern int oss_present;
|
|
|
|
/*
|
|
* Initialize the VIAs
|
|
*
|
|
* First we figure out where they actually _are_ as well as what type of
|
|
* VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.)
|
|
* Then we pretty much clear them out and disable all IRQ sources.
|
|
*
|
|
* Note: the OSS is actually "detected" here and not in oss_init(). It just
|
|
* seems more logical to do it here since via_init() needs to know
|
|
* these things anyways.
|
|
*/
|
|
|
|
void __init via_init(void)
|
|
{
|
|
switch(macintosh_config->via_type) {
|
|
|
|
/* IIci, IIsi, IIvx, IIvi (P6xx), LC series */
|
|
|
|
case MAC_VIA_IIci:
|
|
via1 = (void *) VIA1_BASE;
|
|
if (macintosh_config->ident == MAC_MODEL_IIFX) {
|
|
via2 = NULL;
|
|
rbv_present = 0;
|
|
oss_present = 1;
|
|
} else {
|
|
via2 = (void *) RBV_BASE;
|
|
rbv_present = 1;
|
|
oss_present = 0;
|
|
}
|
|
if (macintosh_config->ident == MAC_MODEL_LCIII) {
|
|
rbv_clear = 0x00;
|
|
} else {
|
|
/* on most RBVs (& unlike the VIAs), you */
|
|
/* need to set bit 7 when you write to IFR */
|
|
/* in order for your clear to occur. */
|
|
rbv_clear = 0x80;
|
|
}
|
|
gIER = rIER;
|
|
gIFR = rIFR;
|
|
gBufA = rSIFR;
|
|
gBufB = rBufB;
|
|
break;
|
|
|
|
/* Quadra and early MacIIs agree on the VIA locations */
|
|
|
|
case MAC_VIA_QUADRA:
|
|
case MAC_VIA_II:
|
|
via1 = (void *) VIA1_BASE;
|
|
via2 = (void *) VIA2_BASE;
|
|
rbv_present = 0;
|
|
oss_present = 0;
|
|
rbv_clear = 0x00;
|
|
gIER = vIER;
|
|
gIFR = vIFR;
|
|
gBufA = vBufA;
|
|
gBufB = vBufB;
|
|
break;
|
|
default:
|
|
panic("UNKNOWN VIA TYPE");
|
|
}
|
|
|
|
printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1);
|
|
|
|
printk(KERN_INFO "VIA2 at %p is ", via2);
|
|
if (rbv_present) {
|
|
printk("an RBV\n");
|
|
} else if (oss_present) {
|
|
printk("an OSS\n");
|
|
} else {
|
|
printk("a 6522 or clone\n");
|
|
}
|
|
|
|
#ifdef DEBUG_VIA
|
|
via_debug_dump();
|
|
#endif
|
|
|
|
/*
|
|
* Shut down all IRQ sources, reset the timers, and
|
|
* kill the timer latch on VIA1.
|
|
*/
|
|
|
|
via1[vIER] = 0x7F;
|
|
via1[vIFR] = 0x7F;
|
|
via1[vT1LL] = 0;
|
|
via1[vT1LH] = 0;
|
|
via1[vT1CL] = 0;
|
|
via1[vT1CH] = 0;
|
|
via1[vT2CL] = 0;
|
|
via1[vT2CH] = 0;
|
|
via1[vACR] &= 0x3F;
|
|
via1[vACR] &= ~0x03; /* disable port A & B latches */
|
|
|
|
/*
|
|
* SE/30: disable video IRQ
|
|
* XXX: testing for SE/30 VBL
|
|
*/
|
|
|
|
if (macintosh_config->ident == MAC_MODEL_SE30) {
|
|
via1[vDirB] |= 0x40;
|
|
via1[vBufB] |= 0x40;
|
|
}
|
|
|
|
/*
|
|
* Set the RTC bits to a known state: all lines to outputs and
|
|
* RTC disabled (yes that's 0 to enable and 1 to disable).
|
|
*/
|
|
|
|
via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData);
|
|
via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk);
|
|
|
|
/* Everything below this point is VIA2/RBV only... */
|
|
|
|
if (oss_present) return;
|
|
|
|
#if 1
|
|
/* Some machines support an alternate IRQ mapping that spreads */
|
|
/* Ethernet and Sound out to their own autolevel IRQs and moves */
|
|
/* VIA1 to level 6. A/UX uses this mapping and we do too. Note */
|
|
/* that the IIfx emulates this alternate mapping using the OSS. */
|
|
|
|
switch(macintosh_config->ident) {
|
|
case MAC_MODEL_P475:
|
|
case MAC_MODEL_P475F:
|
|
case MAC_MODEL_P575:
|
|
case MAC_MODEL_Q605:
|
|
case MAC_MODEL_Q605_ACC:
|
|
case MAC_MODEL_C610:
|
|
case MAC_MODEL_Q610:
|
|
case MAC_MODEL_Q630:
|
|
case MAC_MODEL_C650:
|
|
case MAC_MODEL_Q650:
|
|
case MAC_MODEL_Q700:
|
|
case MAC_MODEL_Q800:
|
|
case MAC_MODEL_Q900:
|
|
case MAC_MODEL_Q950:
|
|
via_alt_mapping = 1;
|
|
via1[vDirB] |= 0x40;
|
|
via1[vBufB] &= ~0x40;
|
|
break;
|
|
default:
|
|
via_alt_mapping = 0;
|
|
break;
|
|
}
|
|
#else
|
|
via_alt_mapping = 0;
|
|
#endif
|
|
|
|
/*
|
|
* Now initialize VIA2. For RBV we just kill all interrupts;
|
|
* for a regular VIA we also reset the timers and stuff.
|
|
*/
|
|
|
|
via2[gIER] = 0x7F;
|
|
via2[gIFR] = 0x7F | rbv_clear;
|
|
if (!rbv_present) {
|
|
via2[vT1LL] = 0;
|
|
via2[vT1LH] = 0;
|
|
via2[vT1CL] = 0;
|
|
via2[vT1CH] = 0;
|
|
via2[vT2CL] = 0;
|
|
via2[vT2CH] = 0;
|
|
via2[vACR] &= 0x3F;
|
|
via2[vACR] &= ~0x03; /* disable port A & B latches */
|
|
}
|
|
|
|
/*
|
|
* Set vPCR for SCSI interrupts (but not on RBV)
|
|
*/
|
|
if (!rbv_present) {
|
|
if (macintosh_config->scsi_type == MAC_SCSI_OLD) {
|
|
/* CB2 (IRQ) indep. input, positive edge */
|
|
/* CA2 (DRQ) indep. input, positive edge */
|
|
via2[vPCR] = 0x66;
|
|
} else {
|
|
/* CB2 (IRQ) indep. input, negative edge */
|
|
/* CA2 (DRQ) indep. input, negative edge */
|
|
via2[vPCR] = 0x22;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Start the 100 Hz clock
|
|
*/
|
|
|
|
void __init via_init_clock(irq_handler_t func)
|
|
{
|
|
via1[vACR] |= 0x40;
|
|
via1[vT1LL] = MAC_CLOCK_LOW;
|
|
via1[vT1LH] = MAC_CLOCK_HIGH;
|
|
via1[vT1CL] = MAC_CLOCK_LOW;
|
|
via1[vT1CH] = MAC_CLOCK_HIGH;
|
|
|
|
request_irq(IRQ_MAC_TIMER_1, func, IRQ_FLG_LOCK, "timer", func);
|
|
}
|
|
|
|
/*
|
|
* Register the interrupt dispatchers for VIA or RBV machines only.
|
|
*/
|
|
|
|
void __init via_register_interrupts(void)
|
|
{
|
|
if (via_alt_mapping) {
|
|
request_irq(IRQ_AUTO_1, via1_irq,
|
|
IRQ_FLG_LOCK|IRQ_FLG_FAST, "software",
|
|
(void *) via1);
|
|
request_irq(IRQ_AUTO_6, via1_irq,
|
|
IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1",
|
|
(void *) via1);
|
|
} else {
|
|
request_irq(IRQ_AUTO_1, via1_irq,
|
|
IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1",
|
|
(void *) via1);
|
|
}
|
|
request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
|
|
"via2", (void *) via2);
|
|
if (!psc_present) {
|
|
request_irq(IRQ_AUTO_4, mac_scc_dispatch, IRQ_FLG_LOCK,
|
|
"scc", mac_scc_dispatch);
|
|
}
|
|
request_irq(IRQ_MAC_NUBUS, via_nubus_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
|
|
"nubus", (void *) via2);
|
|
}
|
|
|
|
/*
|
|
* Debugging dump, used in various places to see what's going on.
|
|
*/
|
|
|
|
void via_debug_dump(void)
|
|
{
|
|
printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
|
|
(uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]);
|
|
printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n",
|
|
(uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]);
|
|
if (oss_present) {
|
|
printk(KERN_DEBUG "VIA2: <OSS>\n");
|
|
} else if (rbv_present) {
|
|
printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n",
|
|
(uint) via2[rIFR], (uint) via2[rIER]);
|
|
printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n",
|
|
(uint) via2[rSIFR], (uint) via2[rSIER]);
|
|
} else {
|
|
printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
|
|
(uint) via2[vDirA], (uint) via2[vDirB],
|
|
(uint) via2[vACR]);
|
|
printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n",
|
|
(uint) via2[vPCR],
|
|
(uint) via2[vIFR], (uint) via2[vIER]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is always executed with interrupts disabled.
|
|
*
|
|
* TBI: get time offset between scheduling timer ticks
|
|
*/
|
|
|
|
unsigned long mac_gettimeoffset (void)
|
|
{
|
|
unsigned long ticks, offset = 0;
|
|
|
|
/* read VIA1 timer 2 current value */
|
|
ticks = via1[vT1CL] | (via1[vT1CH] << 8);
|
|
/* The probability of underflow is less than 2% */
|
|
if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50)
|
|
/* Check for pending timer interrupt in VIA1 IFR */
|
|
if (via1[vIFR] & 0x40) offset = TICK_SIZE;
|
|
|
|
ticks = MAC_CLOCK_TICK - ticks;
|
|
ticks = ticks * 10000L / MAC_CLOCK_TICK;
|
|
|
|
return ticks + offset;
|
|
}
|
|
|
|
/*
|
|
* Flush the L2 cache on Macs that have it by flipping
|
|
* the system into 24-bit mode for an instant.
|
|
*/
|
|
|
|
void via_flush_cache(void)
|
|
{
|
|
via2[gBufB] &= ~VIA2B_vMode32;
|
|
via2[gBufB] |= VIA2B_vMode32;
|
|
}
|
|
|
|
/*
|
|
* Return the status of the L2 cache on a IIci
|
|
*/
|
|
|
|
int via_get_cache_disable(void)
|
|
{
|
|
/* Safeguard against being called accidentally */
|
|
if (!via2) {
|
|
printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n");
|
|
return 1;
|
|
}
|
|
|
|
return (int) via2[gBufB] & VIA2B_vCDis;
|
|
}
|
|
|
|
/*
|
|
* Initialize VIA2 for Nubus access
|
|
*/
|
|
|
|
void __init via_nubus_init(void)
|
|
{
|
|
/* unlock nubus transactions */
|
|
|
|
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
|
|
(macintosh_config->adb_type != MAC_ADB_PB2)) {
|
|
/* set the line to be an output on non-RBV machines */
|
|
if (!rbv_present)
|
|
via2[vDirB] |= 0x02;
|
|
|
|
/* this seems to be an ADB bit on PMU machines */
|
|
/* according to MkLinux. -- jmt */
|
|
via2[gBufB] |= 0x02;
|
|
}
|
|
|
|
/* Disable all the slot interrupts (where possible). */
|
|
|
|
switch (macintosh_config->via_type) {
|
|
case MAC_VIA_II:
|
|
/* Just make the port A lines inputs. */
|
|
switch(macintosh_config->ident) {
|
|
case MAC_MODEL_II:
|
|
case MAC_MODEL_IIX:
|
|
case MAC_MODEL_IICX:
|
|
case MAC_MODEL_SE30:
|
|
/* The top two bits are RAM size outputs. */
|
|
via2[vDirA] &= 0xC0;
|
|
break;
|
|
default:
|
|
via2[vDirA] &= 0x80;
|
|
}
|
|
break;
|
|
case MAC_VIA_IIci:
|
|
/* RBV. Disable all the slot interrupts. SIER works like IER. */
|
|
via2[rSIER] = 0x7F;
|
|
break;
|
|
case MAC_VIA_QUADRA:
|
|
/* Disable the inactive slot interrupts by making those lines outputs. */
|
|
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
|
|
(macintosh_config->adb_type != MAC_ADB_PB2)) {
|
|
via2[vBufA] |= 0x7F;
|
|
via2[vDirA] |= 0x7F;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The generic VIA interrupt routines (shamelessly stolen from Alan Cox's
|
|
* via6522.c :-), disable/pending masks added.
|
|
*/
|
|
|
|
irqreturn_t via1_irq(int irq, void *dev_id)
|
|
{
|
|
int irq_num;
|
|
unsigned char irq_bit, events;
|
|
|
|
events = via1[vIFR] & via1[vIER] & 0x7F;
|
|
if (!events)
|
|
return IRQ_NONE;
|
|
|
|
irq_num = VIA1_SOURCE_BASE;
|
|
irq_bit = 1;
|
|
do {
|
|
if (events & irq_bit) {
|
|
via1[vIFR] = irq_bit;
|
|
m68k_handle_int(irq_num);
|
|
}
|
|
++irq_num;
|
|
irq_bit <<= 1;
|
|
} while (events >= irq_bit);
|
|
|
|
#if 0 /* freakin' pmu is doing weird stuff */
|
|
if (!oss_present) {
|
|
/* This (still) seems to be necessary to get IDE
|
|
working. However, if you enable VBL interrupts,
|
|
you're screwed... */
|
|
/* FIXME: should we check the SLOTIRQ bit before
|
|
pulling this stunt? */
|
|
/* No, it won't be set. that's why we're doing this. */
|
|
via_irq_disable(IRQ_MAC_NUBUS);
|
|
via_irq_clear(IRQ_MAC_NUBUS);
|
|
m68k_handle_int(IRQ_MAC_NUBUS);
|
|
via_irq_enable(IRQ_MAC_NUBUS);
|
|
}
|
|
#endif
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
irqreturn_t via2_irq(int irq, void *dev_id)
|
|
{
|
|
int irq_num;
|
|
unsigned char irq_bit, events;
|
|
|
|
events = via2[gIFR] & via2[gIER] & 0x7F;
|
|
if (!events)
|
|
return IRQ_NONE;
|
|
|
|
irq_num = VIA2_SOURCE_BASE;
|
|
irq_bit = 1;
|
|
do {
|
|
if (events & irq_bit) {
|
|
via2[gIFR] = irq_bit | rbv_clear;
|
|
m68k_handle_int(irq_num);
|
|
}
|
|
++irq_num;
|
|
irq_bit <<= 1;
|
|
} while (events >= irq_bit);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Dispatch Nubus interrupts. We are called as a secondary dispatch by the
|
|
* VIA2 dispatcher as a fast interrupt handler.
|
|
*/
|
|
|
|
irqreturn_t via_nubus_irq(int irq, void *dev_id)
|
|
{
|
|
int slot_irq;
|
|
unsigned char slot_bit, events;
|
|
|
|
events = ~via2[gBufA] & 0x7F;
|
|
if (rbv_present)
|
|
events &= via2[rSIER];
|
|
else
|
|
events &= ~via2[vDirA];
|
|
if (!events)
|
|
return IRQ_NONE;
|
|
|
|
do {
|
|
slot_irq = IRQ_NUBUS_F;
|
|
slot_bit = 0x40;
|
|
do {
|
|
if (events & slot_bit) {
|
|
events &= ~slot_bit;
|
|
m68k_handle_int(slot_irq);
|
|
}
|
|
--slot_irq;
|
|
slot_bit >>= 1;
|
|
} while (events);
|
|
|
|
/* clear the CA1 interrupt and make certain there's no more. */
|
|
via2[gIFR] = 0x02 | rbv_clear;
|
|
events = ~via2[gBufA] & 0x7F;
|
|
if (rbv_present)
|
|
events &= via2[rSIER];
|
|
else
|
|
events &= ~via2[vDirA];
|
|
} while (events);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
void via_irq_enable(int irq) {
|
|
int irq_src = IRQ_SRC(irq);
|
|
int irq_idx = IRQ_IDX(irq);
|
|
|
|
#ifdef DEBUG_IRQUSE
|
|
printk(KERN_DEBUG "via_irq_enable(%d)\n", irq);
|
|
#endif
|
|
|
|
if (irq_src == 1) {
|
|
via1[vIER] = IER_SET_BIT(irq_idx);
|
|
} else if (irq_src == 2) {
|
|
if (irq != IRQ_MAC_NUBUS || nubus_disabled == 0)
|
|
via2[gIER] = IER_SET_BIT(irq_idx);
|
|
} else if (irq_src == 7) {
|
|
switch (macintosh_config->via_type) {
|
|
case MAC_VIA_II:
|
|
nubus_disabled &= ~(1 << irq_idx);
|
|
/* Enable the CA1 interrupt when no slot is disabled. */
|
|
if (!nubus_disabled)
|
|
via2[gIER] = IER_SET_BIT(1);
|
|
break;
|
|
case MAC_VIA_IIci:
|
|
/* On RBV, enable the slot interrupt.
|
|
* SIER works like IER.
|
|
*/
|
|
via2[rSIER] = IER_SET_BIT(irq_idx);
|
|
break;
|
|
case MAC_VIA_QUADRA:
|
|
/* Make the port A line an input to enable the slot irq.
|
|
* But not on PowerBooks, that's ADB.
|
|
*/
|
|
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
|
|
(macintosh_config->adb_type != MAC_ADB_PB2))
|
|
via2[vDirA] &= ~(1 << irq_idx);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void via_irq_disable(int irq) {
|
|
int irq_src = IRQ_SRC(irq);
|
|
int irq_idx = IRQ_IDX(irq);
|
|
|
|
#ifdef DEBUG_IRQUSE
|
|
printk(KERN_DEBUG "via_irq_disable(%d)\n", irq);
|
|
#endif
|
|
|
|
if (irq_src == 1) {
|
|
via1[vIER] = IER_CLR_BIT(irq_idx);
|
|
} else if (irq_src == 2) {
|
|
via2[gIER] = IER_CLR_BIT(irq_idx);
|
|
} else if (irq_src == 7) {
|
|
switch (macintosh_config->via_type) {
|
|
case MAC_VIA_II:
|
|
nubus_disabled |= 1 << irq_idx;
|
|
if (nubus_disabled)
|
|
via2[gIER] = IER_CLR_BIT(1);
|
|
break;
|
|
case MAC_VIA_IIci:
|
|
via2[rSIER] = IER_CLR_BIT(irq_idx);
|
|
break;
|
|
case MAC_VIA_QUADRA:
|
|
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
|
|
(macintosh_config->adb_type != MAC_ADB_PB2))
|
|
via2[vDirA] |= 1 << irq_idx;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void via_irq_clear(int irq) {
|
|
int irq_src = IRQ_SRC(irq);
|
|
int irq_idx = IRQ_IDX(irq);
|
|
int irq_bit = 1 << irq_idx;
|
|
|
|
if (irq_src == 1) {
|
|
via1[vIFR] = irq_bit;
|
|
} else if (irq_src == 2) {
|
|
via2[gIFR] = irq_bit | rbv_clear;
|
|
} else if (irq_src == 7) {
|
|
/* FIXME: There is no way to clear an individual nubus slot
|
|
* IRQ flag, other than getting the device to do it.
|
|
*/
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns nonzero if an interrupt is pending on the given
|
|
* VIA/IRQ combination.
|
|
*/
|
|
|
|
int via_irq_pending(int irq)
|
|
{
|
|
int irq_src = IRQ_SRC(irq);
|
|
int irq_idx = IRQ_IDX(irq);
|
|
int irq_bit = 1 << irq_idx;
|
|
|
|
if (irq_src == 1) {
|
|
return via1[vIFR] & irq_bit;
|
|
} else if (irq_src == 2) {
|
|
return via2[gIFR] & irq_bit;
|
|
} else if (irq_src == 7) {
|
|
/* Always 0 for MAC_VIA_QUADRA if the slot irq is disabled. */
|
|
return ~via2[gBufA] & irq_bit;
|
|
}
|
|
return 0;
|
|
}
|