Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 619 insertions, 0 deletions

diff --git a/arch/m68k/mac/via.c b/arch/m68k/mac/via.c
new file mode 100644
index 000000000000..cd528bf7b43f
--- /dev/null
+++ b/arch/m68k/mac/via.c
@@ -0,0 +1,619 @@
+/*
+ *	6522 Versatile Interface Adapter (VIA)
+ *
+ *	There are two of these on the Mac II. Some IRQ's 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
+ *
+ * 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 <asm/traps.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,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)
+
+static int  nubus_active;
+
+void via_debug_dump(void);
+irqreturn_t via1_irq(int, void *, struct pt_regs *);
+irqreturn_t via2_irq(int, void *, struct pt_regs *);
+irqreturn_t via_nubus_irq(int, void *, struct pt_regs *);
+void via_irq_enable(int irq);
+void via_irq_disable(int irq);
+void via_irq_clear(int irq);
+
+extern irqreturn_t mac_bang(int, void *, struct pt_regs *);
+extern irqreturn_t mac_scc_dispatch(int, void *, struct pt_regs *);
+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(KERN_INFO "an RBV\n");
+	} else if (oss_present) {
+		printk(KERN_INFO "an OSS\n");
+	} else {
+		printk(KERN_INFO "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;
+
+	/*
+	 * 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_C610:
+		case MAC_MODEL_Q610:
+		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
+	/* The alernate IRQ mapping seems to just not work. Anyone with a   */
+	/* supported machine is welcome to take a stab at fixing it. It     */
+	/* _should_ work on the following Quadras: 610,650,700,800,900,950  */
+	/*                                               - 1999-06-12 (jmt) */
+
+	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;
+	}
+}
+
+/*
+ * Start the 100 Hz clock
+ */
+
+void __init via_init_clock(irqreturn_t (*func)(int, void *, struct pt_regs *))
+{
+	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) {
+		cpu_request_irq(IRQ_AUTO_1, via1_irq,
+				IRQ_FLG_LOCK|IRQ_FLG_FAST, "software",
+				(void *) via1);
+		cpu_request_irq(IRQ_AUTO_6, via1_irq,
+				IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1",
+				(void *) via1);
+	} else {
+		cpu_request_irq(IRQ_AUTO_1, via1_irq,
+				IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1",
+				(void *) via1);
+#if 0 /* interferes with serial on some machines */
+		if (!psc_present) {
+			cpu_request_irq(IRQ_AUTO_6, mac_bang, IRQ_FLG_LOCK,
+					"Off Switch", mac_bang);
+		}
+#endif
+	}
+	cpu_request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
+			"via2", (void *) via2);
+	if (!psc_present) {
+		cpu_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)
+{
+	/* don't set nubus_active = 0 here, it kills the Baboon */
+	/* interrupt that we've already registered.		*/
+
+	/* unlock nubus transactions */
+
+	if (!rbv_present) {
+		/* 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)) {
+			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)) {
+		via2[gBufB] |= 0x02;
+	}
+
+	/* disable nubus slot interrupts. */
+	if (rbv_present) {
+		via2[rSIER] = 0x7F;
+		via2[rSIER] = nubus_active | 0x80;
+	} else {
+		/* These are ADB bits on PMU */
+		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;
+			}
+		}
+	}
+}
+
+/*
+ * 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, struct pt_regs *regs)
+{
+	int irq_bit, i;
+	unsigned char events, mask;
+
+	mask = via1[vIER] & 0x7F;
+	if (!(events = via1[vIFR] & mask))
+		return IRQ_NONE;
+
+	for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1)
+		if (events & irq_bit) {
+			via1[vIER] = irq_bit;
+			mac_do_irq_list(VIA1_SOURCE_BASE + i, regs);
+			via1[vIFR] = irq_bit;
+			via1[vIER] = irq_bit | 0x80;
+		}
+
+#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);
+		mac_do_irq_list(IRQ_MAC_NUBUS, regs);
+		via_irq_enable(IRQ_MAC_NUBUS);
+	}
+#endif
+	return IRQ_HANDLED;
+}
+
+irqreturn_t via2_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+	int irq_bit, i;
+	unsigned char events, mask;
+
+	mask = via2[gIER] & 0x7F;
+	if (!(events = via2[gIFR] & mask))
+		return IRQ_NONE;
+
+	for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1)
+		if (events & irq_bit) {
+			via2[gIER] = irq_bit;
+			mac_do_irq_list(VIA2_SOURCE_BASE + i, regs);
+			via2[gIFR] = irq_bit | rbv_clear;
+			via2[gIER] = irq_bit | 0x80;
+		}
+	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, struct pt_regs *regs)
+{
+	int irq_bit, i;
+	unsigned char events;
+
+	if (!(events = ~via2[gBufA] & nubus_active))
+		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);
+			mac_do_irq_list(NUBUS_SOURCE_BASE + i, regs);
+			via_irq_enable(NUBUS_SOURCE_BASE + i);
+		}
+	}
+	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;
+	} 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;
+	} else if (irq_src == 7) {
+		if (rbv_present) {
+			/* 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... */
+			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;
+				}
+			}
+		}
+		nubus_active |= irq_bit;
+	}
+}
+
+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;
+	} else if (irq_src == 2) {
+		via2[gIER] = irq_bit;
+	} else if (irq_src == 7) {
+		if (rbv_present) {
+			/* disable the slot interrupt.  SIER works like IER. */
+			via2[rSIER] = IER_CLR_BIT(irq_idx);
+		} else {
+			/* disable the nubus irq by changing dir to output */
+			/* except on PMU */
+			if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
+			   (macintosh_config->adb_type != MAC_ADB_PB2)) {
+				via2[vDirA] |= irq_bit;
+			}
+		}
+		nubus_active &= ~irq_bit;
+	}
+}
+
+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: hmm.. */
+	}
+}
+
+/*
+ * 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) {
+		return ~via2[gBufA] & irq_bit;
+	}
+	return 0;
+}