aboutsummaryrefslogtreecommitdiffstats
path: root/arch/m68k/mac/via.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/m68k/mac/via.c')
-rw-r--r--arch/m68k/mac/via.c284
1 files changed, 166 insertions, 118 deletions
diff --git a/arch/m68k/mac/via.c b/arch/m68k/mac/via.c
index e27735be2924..d5cac72eb3db 100644
--- a/arch/m68k/mac/via.c
+++ b/arch/m68k/mac/via.c
@@ -13,6 +13,10 @@
* 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)
*
@@ -37,7 +41,7 @@ volatile __u8 *via1, *via2;
/* 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,via_alt_mapping;
+int rbv_present, via_alt_mapping;
__u8 rbv_clear;
/*
@@ -60,7 +64,19 @@ static int gIER,gIFR,gBufA,gBufB;
#define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF)
#define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8)
-static int nubus_active;
+/* 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 *);
@@ -138,11 +154,11 @@ void __init via_init(void)
printk(KERN_INFO "VIA2 at %p is ", via2);
if (rbv_present) {
- printk(KERN_INFO "an RBV\n");
+ printk("an RBV\n");
} else if (oss_present) {
- printk(KERN_INFO "an OSS\n");
+ printk("an OSS\n");
} else {
- printk(KERN_INFO "a 6522 or clone\n");
+ printk("a 6522 or clone\n");
}
#ifdef DEBUG_VIA
@@ -163,6 +179,7 @@ void __init via_init(void)
via1[vT2CL] = 0;
via1[vT2CH] = 0;
via1[vACR] &= 0x3F;
+ via1[vACR] &= ~0x03; /* disable port A & B latches */
/*
* SE/30: disable video IRQ
@@ -193,8 +210,14 @@ void __init via_init(void)
/* 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:
@@ -228,6 +251,22 @@ void __init via_init(void)
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;
+ }
}
}
@@ -356,78 +395,75 @@ int via_get_cache_disable(void)
void __init via_nubus_init(void)
{
- /* don't set nubus_active = 0 here, it kills the Baboon */
- /* interrupt that we've already registered. */
-
/* unlock nubus transactions */
- if (!rbv_present) {
+ 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 ((macintosh_config->adb_type != MAC_ADB_PB1) &&
- (macintosh_config->adb_type != MAC_ADB_PB2)) {
+ if (!rbv_present)
via2[vDirB] |= 0x02;
- }
- }
- /* this seems to be an ADB bit on PMU machines */
- /* according to MkLinux. -- jmt */
-
- if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
- (macintosh_config->adb_type != MAC_ADB_PB2)) {
+ /* this seems to be an ADB bit on PMU machines */
+ /* according to MkLinux. -- jmt */
via2[gBufB] |= 0x02;
}
- /* disable nubus slot interrupts. */
- if (rbv_present) {
+ /* 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;
- via2[rSIER] = nubus_active | 0x80;
- } else {
- /* These are ADB bits on PMU */
+ 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)) {
- switch(macintosh_config->ident)
- {
- case MAC_MODEL_II:
- case MAC_MODEL_IIX:
- case MAC_MODEL_IICX:
- case MAC_MODEL_SE30:
- via2[vBufA] |= 0x3F;
- via2[vDirA] = ~nubus_active | 0xc0;
- break;
- default:
- via2[vBufA] = 0xFF;
- via2[vDirA] = ~nubus_active;
- }
+ (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.
- *
- * The new interrupt architecture in macints.c takes care of a lot of the
- * gruntwork for us, including tallying the interrupts and calling the
- * handlers on the linked list. All we need to do here is basically generate
- * the machspec interrupt number after clearing the interrupt.
*/
irqreturn_t via1_irq(int irq, void *dev_id)
{
- int irq_bit, i;
- unsigned char events, mask;
+ int irq_num;
+ unsigned char irq_bit, events;
- mask = via1[vIER] & 0x7F;
- if (!(events = via1[vIFR] & mask))
+ events = via1[vIFR] & via1[vIER] & 0x7F;
+ if (!events)
return IRQ_NONE;
- for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1)
+ irq_num = VIA1_SOURCE_BASE;
+ irq_bit = 1;
+ do {
if (events & irq_bit) {
- via1[vIER] = irq_bit;
- m68k_handle_int(VIA1_SOURCE_BASE + i);
via1[vIFR] = irq_bit;
- via1[vIER] = irq_bit | 0x80;
+ 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) {
@@ -448,20 +484,23 @@ irqreturn_t via1_irq(int irq, void *dev_id)
irqreturn_t via2_irq(int irq, void *dev_id)
{
- int irq_bit, i;
- unsigned char events, mask;
+ int irq_num;
+ unsigned char irq_bit, events;
- mask = via2[gIER] & 0x7F;
- if (!(events = via2[gIFR] & mask))
+ events = via2[gIFR] & via2[gIER] & 0x7F;
+ if (!events)
return IRQ_NONE;
- for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1)
+ irq_num = VIA2_SOURCE_BASE;
+ irq_bit = 1;
+ do {
if (events & irq_bit) {
- via2[gIER] = irq_bit;
via2[gIFR] = irq_bit | rbv_clear;
- m68k_handle_int(VIA2_SOURCE_BASE + i);
- via2[gIER] = irq_bit | 0x80;
+ m68k_handle_int(irq_num);
}
+ ++irq_num;
+ irq_bit <<= 1;
+ } while (events >= irq_bit);
return IRQ_HANDLED;
}
@@ -472,71 +511,75 @@ irqreturn_t via2_irq(int irq, void *dev_id)
irqreturn_t via_nubus_irq(int irq, void *dev_id)
{
- int irq_bit, i;
- unsigned char events;
-
- if (!(events = ~via2[gBufA] & nubus_active))
+ 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;
- for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) {
- if (events & irq_bit) {
- via_irq_disable(NUBUS_SOURCE_BASE + i);
- m68k_handle_int(NUBUS_SOURCE_BASE + i);
- via_irq_enable(NUBUS_SOURCE_BASE + i);
- }
- }
+ 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);
- int irq_bit = 1 << irq_idx;
#ifdef DEBUG_IRQUSE
printk(KERN_DEBUG "via_irq_enable(%d)\n", irq);
#endif
if (irq_src == 1) {
- via1[vIER] = irq_bit | 0x80;
+ via1[vIER] = IER_SET_BIT(irq_idx);
} else if (irq_src == 2) {
- /*
- * Set vPCR for SCSI interrupts (but not on RBV)
- */
- if ((irq_idx == 0) && !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;
- }
- }
- via2[gIER] = irq_bit | 0x80;
+ if (irq != IRQ_MAC_NUBUS || nubus_disabled == 0)
+ via2[gIER] = IER_SET_BIT(irq_idx);
} else if (irq_src == 7) {
- nubus_active |= irq_bit;
- if (rbv_present) {
- /* enable the slot interrupt. SIER works like IER. */
+ 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);
- } else {
- /* Make sure the bit is an input, to enable the irq */
- /* But not on PowerBooks, that's ADB... */
+ 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)) {
- switch(macintosh_config->ident)
- {
- case MAC_MODEL_II:
- case MAC_MODEL_IIX:
- case MAC_MODEL_IICX:
- case MAC_MODEL_SE30:
- via2[vDirA] &= (~irq_bit | 0xc0);
- break;
- default:
- via2[vDirA] &= ~irq_bit;
- }
- }
+ (macintosh_config->adb_type != MAC_ADB_PB2))
+ via2[vDirA] &= ~(1 << irq_idx);
+ break;
}
}
}
@@ -544,29 +587,31 @@ void via_irq_enable(int irq) {
void via_irq_disable(int irq) {
int irq_src = IRQ_SRC(irq);
int irq_idx = IRQ_IDX(irq);
- int irq_bit = 1 << irq_idx;
#ifdef DEBUG_IRQUSE
printk(KERN_DEBUG "via_irq_disable(%d)\n", irq);
#endif
if (irq_src == 1) {
- via1[vIER] = irq_bit;
+ via1[vIER] = IER_CLR_BIT(irq_idx);
} else if (irq_src == 2) {
- via2[gIER] = irq_bit;
+ via2[gIER] = IER_CLR_BIT(irq_idx);
} else if (irq_src == 7) {
- if (rbv_present) {
- /* disable the slot interrupt. SIER works like IER. */
+ 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);
- } else {
- /* disable the nubus irq by changing dir to output */
- /* except on PMU */
+ break;
+ case MAC_VIA_QUADRA:
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
- (macintosh_config->adb_type != MAC_ADB_PB2)) {
- via2[vDirA] |= irq_bit;
- }
+ (macintosh_config->adb_type != MAC_ADB_PB2))
+ via2[vDirA] |= 1 << irq_idx;
+ break;
}
- nubus_active &= ~irq_bit;
}
}
@@ -580,7 +625,9 @@ void via_irq_clear(int irq) {
} else if (irq_src == 2) {
via2[gIFR] = irq_bit | rbv_clear;
} else if (irq_src == 7) {
- /* FIXME: hmm.. */
+ /* FIXME: There is no way to clear an individual nubus slot
+ * IRQ flag, other than getting the device to do it.
+ */
}
}
@@ -600,6 +647,7 @@ int via_irq_pending(int irq)
} 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;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.