| 1 |
1275 |
phoenix |
/*
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* 6522 Versatile Interface Adapter (VIA)
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*
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* There are two of these on the Mac II. Some IRQ's are vectored
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* via them as are assorted bits and bobs - eg RTC, ADB.
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*
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* CSA: Motorola seems to have removed documentation on the 6522 from
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* their web site; try
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* http://nerini.drf.com/vectrex/other/text/chips/6522/
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* http://www.zymurgy.net/classic/vic20/vicdet1.htm
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* and
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* http://193.23.168.87/mikro_laborversuche/via_iobaustein/via6522_1.html
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* for info. A full-text web search on 6522 AND VIA will probably also
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* net some usefulness. <cananian@alumni.princeton.edu> 20apr1999
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*
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* PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b
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* by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org)
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*
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/ide.h>
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#include <asm/traps.h>
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#include <asm/bootinfo.h>
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#include <asm/macintosh.h>
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#include <asm/macints.h>
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#include <asm/machw.h>
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#include <asm/mac_via.h>
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#include <asm/mac_psc.h>
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volatile __u8 *via1, *via2;
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#if 0
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/* See note in mac_via.h about how this is possibly not useful */
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volatile long *via_memory_bogon=(long *)&via_memory_bogon;
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#endif
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int rbv_present,via_alt_mapping;
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__u8 rbv_clear;
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/*
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* Globals for accessing the VIA chip registers without having to
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* check if we're hitting a real VIA or an RBV. Normally you could
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* just hit the combined register (ie, vIER|rIER) but that seems to
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* break on AV Macs...probably because they actually decode more than
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* eight address bits. Why can't Apple engineers at least be
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* _consistantly_ lazy? - 1999-05-21 (jmt)
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*/
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static int gIER,gIFR,gBufA,gBufB;
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/*
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* Timer defs.
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*/
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#define TICK_SIZE 10000
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#define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */
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#define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF)
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#define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8)
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static int nubus_active = 0;
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void via_debug_dump(void);
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void via1_irq(int, void *, struct pt_regs *);
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void via2_irq(int, void *, struct pt_regs *);
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void via_nubus_irq(int, void *, struct pt_regs *);
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void via_irq_enable(int irq);
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void via_irq_disable(int irq);
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void via_irq_clear(int irq);
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extern void mac_bang(int, void *, struct pt_regs *);
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extern void mac_scc_dispatch(int, void *, struct pt_regs *);
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extern int oss_present;
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/*
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* Initialize the VIAs
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*
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* First we figure out where they actually _are_ as well as what type of
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* VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.)
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* Then we pretty much clear them out and disable all IRQ sources.
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*
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* Note: the OSS is actually "detected" here and not in oss_init(). It just
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* seems more logical to do it here since via_init() needs to know
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* these things anyways.
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*/
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void __init via_init(void)
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{
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switch(macintosh_config->via_type) {
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/* IIci, IIsi, IIvx, IIvi (P6xx), LC series */
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case MAC_VIA_IIci:
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via1 = (void *) VIA1_BASE;
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if (macintosh_config->ident == MAC_MODEL_IIFX) {
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via2 = NULL;
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rbv_present = 0;
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oss_present = 1;
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} else {
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via2 = (void *) RBV_BASE;
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rbv_present = 1;
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oss_present = 0;
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}
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if (macintosh_config->ident == MAC_MODEL_LCIII) {
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rbv_clear = 0x00;
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} else {
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/* on most RBVs (& unlike the VIAs), you */
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/* need to set bit 7 when you write to IFR */
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/* in order for your clear to occur. */
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rbv_clear = 0x80;
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}
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gIER = rIER;
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gIFR = rIFR;
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gBufA = rSIFR;
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gBufB = rBufB;
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break;
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/* Quadra and early MacIIs agree on the VIA locations */
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case MAC_VIA_QUADRA:
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case MAC_VIA_II:
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via1 = (void *) VIA1_BASE;
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via2 = (void *) VIA2_BASE;
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rbv_present = 0;
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oss_present = 0;
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rbv_clear = 0x00;
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gIER = vIER;
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gIFR = vIFR;
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gBufA = vBufA;
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gBufB = vBufB;
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break;
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default:
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panic("UNKNOWN VIA TYPE");
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}
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printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1);
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printk(KERN_INFO "VIA2 at %p is ", via2);
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if (rbv_present) {
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printk(KERN_INFO "an RBV\n");
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} else if (oss_present) {
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printk(KERN_INFO "an OSS\n");
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} else {
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printk(KERN_INFO "a 6522 or clone\n");
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}
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| 151 |
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#ifdef DEBUG_VIA
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via_debug_dump();
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#endif
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/*
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* Shut down all IRQ sources, reset the timers, and
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* kill the timer latch on VIA1.
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*/
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via1[vIER] = 0x7F;
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via1[vIFR] = 0x7F;
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via1[vT1LL] = 0;
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via1[vT1LH] = 0;
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via1[vT1CL] = 0;
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via1[vT1CH] = 0;
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via1[vT2CL] = 0;
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via1[vT2CH] = 0;
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via1[vACR] &= 0x3F;
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/*
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* SE/30: disable video IRQ
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* XXX: testing for SE/30 VBL
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*/
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if (macintosh_config->ident == MAC_MODEL_SE30) {
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via1[vDirB] |= 0x40;
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via1[vBufB] |= 0x40;
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}
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/*
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* Set the RTC bits to a known state: all lines to outputs and
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* RTC disabled (yes that's 0 to enable and 1 to disable).
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*/
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via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData);
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via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk);
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/* Everything below this point is VIA2/RBV only... */
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if (oss_present) return;
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#if 1
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/* Some machines support an alternate IRQ mapping that spreads */
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/* Ethernet and Sound out to their own autolevel IRQs and moves */
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/* VIA1 to level 6. A/UX uses this mapping and we do too. Note */
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/* that the IIfx emulates this alternate mapping using the OSS. */
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| 198 |
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switch(macintosh_config->ident) {
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case MAC_MODEL_C610:
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case MAC_MODEL_Q610:
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case MAC_MODEL_C650:
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case MAC_MODEL_Q650:
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case MAC_MODEL_Q700:
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case MAC_MODEL_Q800:
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case MAC_MODEL_Q900:
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case MAC_MODEL_Q950:
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via_alt_mapping = 1;
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| 208 |
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via1[vDirB] |= 0x40;
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| 209 |
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via1[vBufB] &= ~0x40;
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| 210 |
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break;
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| 211 |
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default:
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| 212 |
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via_alt_mapping = 0;
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| 213 |
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break;
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| 214 |
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}
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| 215 |
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#else
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| 216 |
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/* The alernate IRQ mapping seems to just not work. Anyone with a */
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| 217 |
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/* supported machine is welcome to take a stab at fixing it. It */
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| 218 |
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/* _should_ work on the following Quadras: 610,650,700,800,900,950 */
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| 219 |
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/* - 1999-06-12 (jmt) */
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| 220 |
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| 221 |
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via_alt_mapping = 0;
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#endif
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| 223 |
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| 224 |
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/*
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| 225 |
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* Now initialize VIA2. For RBV we just kill all interrupts;
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| 226 |
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* for a regular VIA we also reset the timers and stuff.
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| 227 |
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*/
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| 228 |
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| 229 |
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via2[gIER] = 0x7F;
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| 230 |
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via2[gIFR] = 0x7F | rbv_clear;
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| 231 |
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if (!rbv_present) {
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| 232 |
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via2[vT1LL] = 0;
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| 233 |
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via2[vT1LH] = 0;
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| 234 |
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via2[vT1CL] = 0;
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| 235 |
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via2[vT1CH] = 0;
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| 236 |
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via2[vT2CL] = 0;
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| 237 |
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via2[vT2CH] = 0;
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| 238 |
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via2[vACR] &= 0x3F;
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| 239 |
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}
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| 240 |
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}
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| 241 |
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| 242 |
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/*
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| 243 |
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* Start the 100 Hz clock
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| 244 |
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*/
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| 245 |
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| 246 |
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void __init via_init_clock(void (*func)(int, void *, struct pt_regs *))
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| 247 |
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{
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| 248 |
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via1[vACR] |= 0x40;
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| 249 |
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via1[vT1LL] = MAC_CLOCK_LOW;
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| 250 |
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via1[vT1LH] = MAC_CLOCK_HIGH;
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| 251 |
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via1[vT1CL] = MAC_CLOCK_LOW;
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| 252 |
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via1[vT1CH] = MAC_CLOCK_HIGH;
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| 253 |
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| 254 |
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request_irq(IRQ_MAC_TIMER_1, func, IRQ_FLG_LOCK, "timer", func);
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| 255 |
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}
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| 256 |
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| 257 |
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/*
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| 258 |
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* Register the interrupt dispatchers for VIA or RBV machines only.
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| 259 |
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*/
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| 260 |
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| 261 |
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void __init via_register_interrupts(void)
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| 262 |
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{
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| 263 |
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if (via_alt_mapping) {
|
| 264 |
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sys_request_irq(IRQ_AUTO_1, via1_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
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| 265 |
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"software", (void *) via1);
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| 266 |
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sys_request_irq(IRQ_AUTO_6, via1_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
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| 267 |
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"via1", (void *) via1);
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| 268 |
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} else {
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| 269 |
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sys_request_irq(IRQ_AUTO_1, via1_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
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| 270 |
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"via1", (void *) via1);
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| 271 |
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#if 0 /* interferes with serial on some machines */
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| 272 |
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if (!psc_present) {
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| 273 |
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sys_request_irq(IRQ_AUTO_6, mac_bang, IRQ_FLG_LOCK,
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| 274 |
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"Off Switch", mac_bang);
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| 275 |
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}
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| 276 |
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#endif
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| 277 |
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}
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| 278 |
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sys_request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
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| 279 |
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"via2", (void *) via2);
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| 280 |
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if (!psc_present) {
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| 281 |
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sys_request_irq(IRQ_AUTO_4, mac_scc_dispatch, IRQ_FLG_LOCK,
|
| 282 |
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"scc", mac_scc_dispatch);
|
| 283 |
|
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}
|
| 284 |
|
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request_irq(IRQ_MAC_NUBUS, via_nubus_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
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| 285 |
|
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"nubus", (void *) via2);
|
| 286 |
|
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}
|
| 287 |
|
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|
| 288 |
|
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/*
|
| 289 |
|
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* Debugging dump, used in various places to see what's going on.
|
| 290 |
|
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*/
|
| 291 |
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|
| 292 |
|
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void via_debug_dump(void)
|
| 293 |
|
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{
|
| 294 |
|
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printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
|
| 295 |
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(uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]);
|
| 296 |
|
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printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n",
|
| 297 |
|
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(uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]);
|
| 298 |
|
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if (oss_present) {
|
| 299 |
|
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printk(KERN_DEBUG "VIA2: <OSS>\n");
|
| 300 |
|
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} else if (rbv_present) {
|
| 301 |
|
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printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n",
|
| 302 |
|
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(uint) via2[rIFR], (uint) via2[rIER]);
|
| 303 |
|
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printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n",
|
| 304 |
|
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(uint) via2[rSIFR], (uint) via2[rSIER]);
|
| 305 |
|
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} else {
|
| 306 |
|
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printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
|
| 307 |
|
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(uint) via2[vDirA], (uint) via2[vDirB],
|
| 308 |
|
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(uint) via2[vACR]);
|
| 309 |
|
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printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n",
|
| 310 |
|
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(uint) via2[vPCR],
|
| 311 |
|
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(uint) via2[vIFR], (uint) via2[vIER]);
|
| 312 |
|
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}
|
| 313 |
|
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}
|
| 314 |
|
|
|
| 315 |
|
|
/*
|
| 316 |
|
|
* This is always executed with interrupts disabled.
|
| 317 |
|
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*
|
| 318 |
|
|
* TBI: get time offset between scheduling timer ticks
|
| 319 |
|
|
*/
|
| 320 |
|
|
|
| 321 |
|
|
unsigned long mac_gettimeoffset (void)
|
| 322 |
|
|
{
|
| 323 |
|
|
unsigned long ticks, offset = 0;
|
| 324 |
|
|
|
| 325 |
|
|
/* read VIA1 timer 2 current value */
|
| 326 |
|
|
ticks = via1[vT1CL] | (via1[vT1CH] << 8);
|
| 327 |
|
|
/* The probability of underflow is less than 2% */
|
| 328 |
|
|
if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50)
|
| 329 |
|
|
/* Check for pending timer interrupt in VIA1 IFR */
|
| 330 |
|
|
if (via1[vIFR] & 0x40) offset = TICK_SIZE;
|
| 331 |
|
|
|
| 332 |
|
|
ticks = MAC_CLOCK_TICK - ticks;
|
| 333 |
|
|
ticks = ticks * 10000L / MAC_CLOCK_TICK;
|
| 334 |
|
|
|
| 335 |
|
|
return ticks + offset;
|
| 336 |
|
|
}
|
| 337 |
|
|
|
| 338 |
|
|
/*
|
| 339 |
|
|
* Flush the L2 cache on Macs that have it by flipping
|
| 340 |
|
|
* the system into 24-bit mode for an instant.
|
| 341 |
|
|
*/
|
| 342 |
|
|
|
| 343 |
|
|
void via_flush_cache(void)
|
| 344 |
|
|
{
|
| 345 |
|
|
via2[gBufB] &= ~VIA2B_vMode32;
|
| 346 |
|
|
via2[gBufB] |= VIA2B_vMode32;
|
| 347 |
|
|
}
|
| 348 |
|
|
|
| 349 |
|
|
/*
|
| 350 |
|
|
* Return the status of the L2 cache on a IIci
|
| 351 |
|
|
*/
|
| 352 |
|
|
|
| 353 |
|
|
int via_get_cache_disable(void)
|
| 354 |
|
|
{
|
| 355 |
|
|
/* Safeguard against being called accidentally */
|
| 356 |
|
|
if (!via2) {
|
| 357 |
|
|
printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n");
|
| 358 |
|
|
return 1;
|
| 359 |
|
|
}
|
| 360 |
|
|
|
| 361 |
|
|
return (int) via2[gBufB] & VIA2B_vCDis;
|
| 362 |
|
|
}
|
| 363 |
|
|
|
| 364 |
|
|
/*
|
| 365 |
|
|
* Initialize VIA2 for Nubus access
|
| 366 |
|
|
*/
|
| 367 |
|
|
|
| 368 |
|
|
void __init via_nubus_init(void)
|
| 369 |
|
|
{
|
| 370 |
|
|
/* don't set nubus_active = 0 here, it kills the Baboon */
|
| 371 |
|
|
/* interrupt that we've already registered. */
|
| 372 |
|
|
|
| 373 |
|
|
/* unlock nubus transactions */
|
| 374 |
|
|
|
| 375 |
|
|
if (!rbv_present) {
|
| 376 |
|
|
/* set the line to be an output on non-RBV machines */
|
| 377 |
|
|
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
|
| 378 |
|
|
(macintosh_config->adb_type != MAC_ADB_PB2)) {
|
| 379 |
|
|
via2[vDirB] |= 0x02;
|
| 380 |
|
|
}
|
| 381 |
|
|
}
|
| 382 |
|
|
|
| 383 |
|
|
/* this seems to be an ADB bit on PMU machines */
|
| 384 |
|
|
/* according to MkLinux. -- jmt */
|
| 385 |
|
|
|
| 386 |
|
|
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
|
| 387 |
|
|
(macintosh_config->adb_type != MAC_ADB_PB2)) {
|
| 388 |
|
|
via2[gBufB] |= 0x02;
|
| 389 |
|
|
}
|
| 390 |
|
|
|
| 391 |
|
|
/* disable nubus slot interrupts. */
|
| 392 |
|
|
if (rbv_present) {
|
| 393 |
|
|
via2[rSIER] = 0x7F;
|
| 394 |
|
|
via2[rSIER] = nubus_active | 0x80;
|
| 395 |
|
|
} else {
|
| 396 |
|
|
/* These are ADB bits on PMU */
|
| 397 |
|
|
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
|
| 398 |
|
|
(macintosh_config->adb_type != MAC_ADB_PB2)) {
|
| 399 |
|
|
switch(macintosh_config->ident)
|
| 400 |
|
|
{
|
| 401 |
|
|
case MAC_MODEL_II:
|
| 402 |
|
|
case MAC_MODEL_IIX:
|
| 403 |
|
|
case MAC_MODEL_IICX:
|
| 404 |
|
|
case MAC_MODEL_SE30:
|
| 405 |
|
|
via2[vBufA] |= 0x3F;
|
| 406 |
|
|
via2[vDirA] = ~nubus_active | 0xc0;
|
| 407 |
|
|
break;
|
| 408 |
|
|
default:
|
| 409 |
|
|
via2[vBufA] = 0xFF;
|
| 410 |
|
|
via2[vDirA] = ~nubus_active;
|
| 411 |
|
|
}
|
| 412 |
|
|
}
|
| 413 |
|
|
}
|
| 414 |
|
|
}
|
| 415 |
|
|
|
| 416 |
|
|
/*
|
| 417 |
|
|
* The generic VIA interrupt routines (shamelessly stolen from Alan Cox's
|
| 418 |
|
|
* via6522.c :-), disable/pending masks added.
|
| 419 |
|
|
*
|
| 420 |
|
|
* The new interrupt architecture in macints.c takes care of a lot of the
|
| 421 |
|
|
* gruntwork for us, including tallying the interrupts and calling the
|
| 422 |
|
|
* handlers on the linked list. All we need to do here is basically generate
|
| 423 |
|
|
* the machspec interrupt number after clearing the interrupt.
|
| 424 |
|
|
*/
|
| 425 |
|
|
|
| 426 |
|
|
void via1_irq(int irq, void *dev_id, struct pt_regs *regs)
|
| 427 |
|
|
{
|
| 428 |
|
|
int irq_bit, i;
|
| 429 |
|
|
unsigned char events, mask;
|
| 430 |
|
|
|
| 431 |
|
|
mask = via1[vIER] & 0x7F;
|
| 432 |
|
|
if (!(events = via1[vIFR] & mask)) return;
|
| 433 |
|
|
|
| 434 |
|
|
for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1)
|
| 435 |
|
|
if (events & irq_bit) {
|
| 436 |
|
|
via1[vIER] = irq_bit;
|
| 437 |
|
|
mac_do_irq_list(VIA1_SOURCE_BASE + i, regs);
|
| 438 |
|
|
via1[vIFR] = irq_bit;
|
| 439 |
|
|
via1[vIER] = irq_bit | 0x80;
|
| 440 |
|
|
}
|
| 441 |
|
|
|
| 442 |
|
|
#if 0 /* freakin' pmu is doing weird stuff */
|
| 443 |
|
|
if (!oss_present) {
|
| 444 |
|
|
/* This (still) seems to be necessary to get IDE
|
| 445 |
|
|
working. However, if you enable VBL interrupts,
|
| 446 |
|
|
you're screwed... */
|
| 447 |
|
|
/* FIXME: should we check the SLOTIRQ bit before
|
| 448 |
|
|
pulling this stunt? */
|
| 449 |
|
|
/* No, it won't be set. that's why we're doing this. */
|
| 450 |
|
|
via_irq_disable(IRQ_MAC_NUBUS);
|
| 451 |
|
|
via_irq_clear(IRQ_MAC_NUBUS);
|
| 452 |
|
|
mac_do_irq_list(IRQ_MAC_NUBUS, regs);
|
| 453 |
|
|
via_irq_enable(IRQ_MAC_NUBUS);
|
| 454 |
|
|
}
|
| 455 |
|
|
#endif
|
| 456 |
|
|
}
|
| 457 |
|
|
|
| 458 |
|
|
void via2_irq(int irq, void *dev_id, struct pt_regs *regs)
|
| 459 |
|
|
{
|
| 460 |
|
|
int irq_bit, i;
|
| 461 |
|
|
unsigned char events, mask;
|
| 462 |
|
|
|
| 463 |
|
|
mask = via2[gIER] & 0x7F;
|
| 464 |
|
|
if (!(events = via2[gIFR] & mask)) return;
|
| 465 |
|
|
|
| 466 |
|
|
for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1)
|
| 467 |
|
|
if (events & irq_bit) {
|
| 468 |
|
|
via2[gIER] = irq_bit;
|
| 469 |
|
|
mac_do_irq_list(VIA2_SOURCE_BASE + i, regs);
|
| 470 |
|
|
via2[gIFR] = irq_bit | rbv_clear;
|
| 471 |
|
|
via2[gIER] = irq_bit | 0x80;
|
| 472 |
|
|
}
|
| 473 |
|
|
}
|
| 474 |
|
|
|
| 475 |
|
|
/*
|
| 476 |
|
|
* Dispatch Nubus interrupts. We are called as a secondary dispatch by the
|
| 477 |
|
|
* VIA2 dispatcher as a fast interrupt handler.
|
| 478 |
|
|
*/
|
| 479 |
|
|
|
| 480 |
|
|
void via_nubus_irq(int irq, void *dev_id, struct pt_regs *regs)
|
| 481 |
|
|
{
|
| 482 |
|
|
int irq_bit, i;
|
| 483 |
|
|
unsigned char events;
|
| 484 |
|
|
|
| 485 |
|
|
if (!(events = ~via2[gBufA] & nubus_active)) return;
|
| 486 |
|
|
|
| 487 |
|
|
for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) {
|
| 488 |
|
|
if (events & irq_bit) {
|
| 489 |
|
|
via_irq_disable(NUBUS_SOURCE_BASE + i);
|
| 490 |
|
|
mac_do_irq_list(NUBUS_SOURCE_BASE + i, regs);
|
| 491 |
|
|
via_irq_enable(NUBUS_SOURCE_BASE + i);
|
| 492 |
|
|
}
|
| 493 |
|
|
}
|
| 494 |
|
|
}
|
| 495 |
|
|
|
| 496 |
|
|
void via_irq_enable(int irq) {
|
| 497 |
|
|
int irq_src = IRQ_SRC(irq);
|
| 498 |
|
|
int irq_idx = IRQ_IDX(irq);
|
| 499 |
|
|
int irq_bit = 1 << irq_idx;
|
| 500 |
|
|
|
| 501 |
|
|
#ifdef DEBUG_IRQUSE
|
| 502 |
|
|
printk(KERN_DEBUG "via_irq_enable(%d)\n", irq);
|
| 503 |
|
|
#endif
|
| 504 |
|
|
|
| 505 |
|
|
if (irq_src == 1) {
|
| 506 |
|
|
via1[vIER] = irq_bit | 0x80;
|
| 507 |
|
|
} else if (irq_src == 2) {
|
| 508 |
|
|
/*
|
| 509 |
|
|
* Set vPCR for SCSI interrupts (but not on RBV)
|
| 510 |
|
|
*/
|
| 511 |
|
|
if ((irq_idx == 0) && !rbv_present) {
|
| 512 |
|
|
if (macintosh_config->scsi_type == MAC_SCSI_OLD) {
|
| 513 |
|
|
/* CB2 (IRQ) indep. input, positive edge */
|
| 514 |
|
|
/* CA2 (DRQ) indep. input, positive edge */
|
| 515 |
|
|
via2[vPCR] = 0x66;
|
| 516 |
|
|
} else {
|
| 517 |
|
|
/* CB2 (IRQ) indep. input, negative edge */
|
| 518 |
|
|
/* CA2 (DRQ) indep. input, negative edge */
|
| 519 |
|
|
via2[vPCR] = 0x22;
|
| 520 |
|
|
}
|
| 521 |
|
|
}
|
| 522 |
|
|
via2[gIER] = irq_bit | 0x80;
|
| 523 |
|
|
} else if (irq_src == 7) {
|
| 524 |
|
|
if (rbv_present) {
|
| 525 |
|
|
/* enable the slot interrupt. SIER works like IER. */
|
| 526 |
|
|
via2[rSIER] = IER_SET_BIT(irq_idx);
|
| 527 |
|
|
} else {
|
| 528 |
|
|
/* Make sure the bit is an input, to enable the irq */
|
| 529 |
|
|
/* But not on PowerBooks, that's ADB... */
|
| 530 |
|
|
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
|
| 531 |
|
|
(macintosh_config->adb_type != MAC_ADB_PB2)) {
|
| 532 |
|
|
switch(macintosh_config->ident)
|
| 533 |
|
|
{
|
| 534 |
|
|
case MAC_MODEL_II:
|
| 535 |
|
|
case MAC_MODEL_IIX:
|
| 536 |
|
|
case MAC_MODEL_IICX:
|
| 537 |
|
|
case MAC_MODEL_SE30:
|
| 538 |
|
|
via2[vDirA] &= (~irq_bit | 0xc0);
|
| 539 |
|
|
break;
|
| 540 |
|
|
default:
|
| 541 |
|
|
via2[vDirA] &= ~irq_bit;
|
| 542 |
|
|
}
|
| 543 |
|
|
}
|
| 544 |
|
|
}
|
| 545 |
|
|
nubus_active |= irq_bit;
|
| 546 |
|
|
}
|
| 547 |
|
|
}
|
| 548 |
|
|
|
| 549 |
|
|
void via_irq_disable(int irq) {
|
| 550 |
|
|
int irq_src = IRQ_SRC(irq);
|
| 551 |
|
|
int irq_idx = IRQ_IDX(irq);
|
| 552 |
|
|
int irq_bit = 1 << irq_idx;
|
| 553 |
|
|
|
| 554 |
|
|
#ifdef DEBUG_IRQUSE
|
| 555 |
|
|
printk(KERN_DEBUG "via_irq_disable(%d)\n", irq);
|
| 556 |
|
|
#endif
|
| 557 |
|
|
|
| 558 |
|
|
if (irq_src == 1) {
|
| 559 |
|
|
via1[vIER] = irq_bit;
|
| 560 |
|
|
} else if (irq_src == 2) {
|
| 561 |
|
|
via2[gIER] = irq_bit;
|
| 562 |
|
|
} else if (irq_src == 7) {
|
| 563 |
|
|
if (rbv_present) {
|
| 564 |
|
|
/* disable the slot interrupt. SIER works like IER. */
|
| 565 |
|
|
via2[rSIER] = IER_CLR_BIT(irq_idx);
|
| 566 |
|
|
} else {
|
| 567 |
|
|
/* disable the nubus irq by changing dir to output */
|
| 568 |
|
|
/* except on PMU */
|
| 569 |
|
|
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
|
| 570 |
|
|
(macintosh_config->adb_type != MAC_ADB_PB2)) {
|
| 571 |
|
|
via2[vDirA] |= irq_bit;
|
| 572 |
|
|
}
|
| 573 |
|
|
}
|
| 574 |
|
|
nubus_active &= ~irq_bit;
|
| 575 |
|
|
}
|
| 576 |
|
|
}
|
| 577 |
|
|
|
| 578 |
|
|
void via_irq_clear(int irq) {
|
| 579 |
|
|
int irq_src = IRQ_SRC(irq);
|
| 580 |
|
|
int irq_idx = IRQ_IDX(irq);
|
| 581 |
|
|
int irq_bit = 1 << irq_idx;
|
| 582 |
|
|
|
| 583 |
|
|
if (irq_src == 1) {
|
| 584 |
|
|
via1[vIFR] = irq_bit;
|
| 585 |
|
|
} else if (irq_src == 2) {
|
| 586 |
|
|
via2[gIFR] = irq_bit | rbv_clear;
|
| 587 |
|
|
} else if (irq_src == 7) {
|
| 588 |
|
|
/* FIXME: hmm.. */
|
| 589 |
|
|
}
|
| 590 |
|
|
}
|
| 591 |
|
|
|
| 592 |
|
|
/*
|
| 593 |
|
|
* Returns nonzero if an interrupt is pending on the given
|
| 594 |
|
|
* VIA/IRQ combination.
|
| 595 |
|
|
*/
|
| 596 |
|
|
|
| 597 |
|
|
int via_irq_pending(int irq)
|
| 598 |
|
|
{
|
| 599 |
|
|
int irq_src = IRQ_SRC(irq);
|
| 600 |
|
|
int irq_idx = IRQ_IDX(irq);
|
| 601 |
|
|
int irq_bit = 1 << irq_idx;
|
| 602 |
|
|
|
| 603 |
|
|
if (irq_src == 1) {
|
| 604 |
|
|
return via1[vIFR] & irq_bit;
|
| 605 |
|
|
} else if (irq_src == 2) {
|
| 606 |
|
|
return via2[gIFR] & irq_bit;
|
| 607 |
|
|
} else if (irq_src == 7) {
|
| 608 |
|
|
return ~via2[gBufA] & irq_bit;
|
| 609 |
|
|
}
|
| 610 |
|
|
return 0;
|
| 611 |
|
|
}
|
