From 32c5540b39a80a26c17e8590eaa8c58102f0d3da Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Sat, 25 Nov 2000 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2000-11-25

---
 bitsy/devuda1341.c | 57 ++++++++++++++++++++++++++++++----------------
 bitsy/fns.h        |  2 +-
 bitsy/power.c      | 45 +++++++++++++++++++-----------------
 bitsy/sa1110dma.c  | 28 ++++++++++++++---------
 bitsy/sa1110dma.h  |  1 +
 bitsy/trap.c       |  2 +-
 6 files changed, 82 insertions(+), 53 deletions(-)

diff --git a/bitsy/devuda1341.c b/bitsy/devuda1341.c
index 5b0ec491cf57f2ec254fb54992829ce668e96622..c692600390b35e9a7820c99e96672c80b3771ebf 100644
--- a/bitsy/devuda1341.c
+++ b/bitsy/devuda1341.c
@@ -642,24 +642,6 @@ indisable(void) {
 	}
 }
 
-void
-audiopower(int flag) {
-	if (debug) {
-		iprint("audiopower %d\n", flag);
-	}
-	if (flag) {
-		egpiobits(EGPIO_audio_power, 1);
-		egpiobits(EGPIO_audio_ic_power | EGPIO_codec_reset, 1);
-	} else {
-		/* power off */
-		if (audio.omode & Aread)
-			indisable();
-		if (audio.omode & Awrite)
-			outdisable();
-		egpiobits(EGPIO_audio_ic_power | EGPIO_codec_reset | EGPIO_audio_power, 0);
-	}
-}
-
 static void
 sendaudio(IOstate *s) {
 	/* interrupt routine calls this too */
@@ -731,6 +713,42 @@ recvaudio(IOstate *s) {
 	iunlock(&s->ilock);
 }
 
+void
+audiopower(int flag) {
+	IOstate *s;
+
+	if (debug) {
+		iprint("audiopower %d\n", flag);
+	}
+	if (flag) {
+		/* power on only when necessary */
+		if (audio.amode) {
+			egpiobits(EGPIO_audio_power | EGPIO_audio_ic_power | EGPIO_codec_reset, 1);
+			enable();
+			if (audio.amode & Aread) {
+				inenable();
+				s = &audio.i;
+				dmareset(s->dma, 1, 0, 4, 2, SSPRecvDMA, Port4SSP);
+				recvaudio(s);
+			}
+			if (audio.amode & Awrite) {
+				outenable();
+				s = &audio.o;
+				dmareset(s->dma, 0, 0, 4, 2, SSPXmitDMA, Port4SSP);
+				sendaudio(s);
+			}
+			mxvolume();
+		}
+	} else {
+		/* power off */
+		if (audio.amode & Aread)
+			indisable();
+		if (audio.amode & Awrite)
+			outdisable();
+		egpiobits(EGPIO_audio_ic_power | EGPIO_codec_reset | EGPIO_audio_power, 0);
+	}
+}
+
 static void
 audiointr(void *x, ulong ndma) {
 	IOstate *s = x;
@@ -804,13 +822,13 @@ audioopen(Chan *c, int mode)
 		if (omode & Aread) {
 			inenable();
 			s = &audio.i;
-			audio.amode |= Aread;
 			if(s->bufinit == 0)
 				bufinit(s);
 			setempty(s);
 			s->emptying = &s->buf[Nbuf-1];
 			s->chan = c;
 			s->dma = dmaalloc(1, 0, 4, 2, SSPRecvDMA, Port4SSP, audiointr, (void*)s);
+			audio.amode |= Aread;
 		}
 		if (omode & Awrite) {
 			outenable();
@@ -821,6 +839,7 @@ audioopen(Chan *c, int mode)
 			setempty(s);
 			s->chan = c;
 			s->dma = dmaalloc(0, 0, 4, 2, SSPXmitDMA, Port4SSP, audiointr, (void*)s);
+			audio.amode |= Awrite;
 		}
 		resetlevel();
 		mxvolume();
diff --git a/bitsy/fns.h b/bitsy/fns.h
index e52db50e645ea7642687012d97ce4a4b5325ccda..7106202089c43ab2deb6ee2f36458fd6eb77e6a2 100644
--- a/bitsy/fns.h
+++ b/bitsy/fns.h
@@ -23,7 +23,7 @@ char*	getconf(char*);
 ulong	getfar(void);
 ulong	getfsr(void);
 #define	getpgcolor(a)	0
-void	gpiointrenable(ulong, int, void (*)(Ureg*, void*), void*, char*)
+void	gpiointrenable(ulong, int, void (*)(Ureg*, void*), void*, char*);
 void	h3650uartsetup(void);
 void	icacheinvalidate(void);
 void	idle(void);
diff --git a/bitsy/power.c b/bitsy/power.c
index 091b48218c80222562242bbb200eec43d1d89a7e..288a015551a82f6b7eb8842ed1cf8a687456f526 100644
--- a/bitsy/power.c
+++ b/bitsy/power.c
@@ -10,8 +10,6 @@
 
 /* Power management for the bitsy */
 
-int powerup;
-
 enum {
 	pmcr_sf		= 0,
 
@@ -21,32 +19,35 @@ enum {
 	pcfr_fo		= 3,
 };
 
+jmp_buf power_resume;
+
 static void
 onoffintr(Ureg*, void *x)
 {
 	/* On/off button interrupt */
 	int i;
 
-	if (powerup) {
-		/* Power back up */
-		powerup = 0;
-		exit(0);
-	} else {
-		/* Power down */
-
-		/* debounce, 50 ms*/
-		for (i = 0; i < 50; i++) {
-			delay(1);
-			if ((gpioregs->level & GPIO_PWR_ON_i) == 0)
-				return;	/* bounced */
-		}
-		powerup = 1;
-		irpower(0);
-		audiopower(0);
-		lcdpower(0);
-		rs232power(0);
-		sa1100_power_off();
+	/* debounce, 50 ms*/
+	for (i = 0; i < 50; i++) {
+		delay(1);
+		if ((gpioregs->level & GPIO_PWR_ON_i) == 0)
+			return;	/* bounced */
+	}
+	if (i = setjmp(power_resume)) {
+		/* power back up */
+		rs232power(1);
+		lcdpower(1);
+		audiopower(1);
+		irpower(1);
+		return;
 	}
+	/* Power down */
+	irpower(0);
+	audiopower(0);
+	lcdpower(0);
+	rs232power(0);
+	sa1100_power_off();
+	/* no return */
 }
 
 static void
@@ -54,6 +55,8 @@ sa1100_power_off(void)
 {
 	delay(100);
 	splhi();
+	/* enable wakeup by µcontroller, on/off switch or real-time clock alarm */
+	powerregs->pwer = 0x80000003;
 	/* disable internal oscillator, float CS lines */
 	powerregs->pcfr = 1<<pcfr_opde | 1<<pcfr_fp | 1<<pcfr_fs;
 	/* set lowest clock */
diff --git a/bitsy/sa1110dma.c b/bitsy/sa1110dma.c
index 74019765f9e12b757dc6daa02899948b29596e24..3d545b6220ca3e95becfd50a16b607ceb7a27f7c 100644
--- a/bitsy/sa1110dma.c
+++ b/bitsy/sa1110dma.c
@@ -78,10 +78,25 @@ dmainit(void) {
 	}
 }
 
+void
+dmareset(int i, int rd, int bigendian, int burstsize, int datumsize, int device, ulong port) {
+	ulong ddar;
+
+	ddar =
+		(rd?1:0)<<RW |
+		(bigendian?1:0)<<E |
+		((burstsize==8)?1:0)<<BS |
+		((datumsize==2)?1:0)<<DW |
+		device<<DS |
+		0x80000000 | ((ulong)port << 6);
+	dmaregs[i].ddar = ddar;
+	dmaregs[i].dcsr_clr = 0xff;
+	if (debug) print("dma: dmareset: 0x%lux\n", ddar);
+}
+
 int
 dmaalloc(int rd, int bigendian, int burstsize, int datumsize, int device, ulong port, void (*intr)(void*, ulong), void *param) {
 	int i;
-	ulong ddar;
 
 	lock(&dma);
 	for (i = 0; i < NDMA; i++) {
@@ -89,18 +104,9 @@ dmaalloc(int rd, int bigendian, int burstsize, int datumsize, int device, ulong
 			continue;
 		dma.chan[i].allocated++;
 		unlock(&dma);
-		ddar =
-			(rd?1:0)<<RW |
-			(bigendian?1:0)<<E |
-			((burstsize==8)?1:0)<<BS |
-			((datumsize==2)?1:0)<<DW |
-			device<<DS |
-			0x80000000 | ((ulong)port << 6);
-		dmaregs[i].ddar = ddar;
-		if (debug) print("dma: dmaalloc: 0x%lux\n", ddar);
+		dmareset(i, rd, bigendian, burstsize, datumsize, device, port);
 		dma.chan[i].intr = intr;
 		dma.chan[i].param = param;
-		dmaregs[i].dcsr_clr = 0xff;
 		return i;
 	}
 	unlock(&dma);
diff --git a/bitsy/sa1110dma.h b/bitsy/sa1110dma.h
index b1c5942b730e8d5a7fca82415a016112524bf969..24810e8d4f4728984ee055a5adf88fe8c265cd4d 100644
--- a/bitsy/sa1110dma.h
+++ b/bitsy/sa1110dma.h
@@ -9,6 +9,7 @@ enum {
 
 void	dmainit(void);
 int		dmaalloc(int, int, int, int, int, ulong, void (*)(void*, ulong), void*);
+void	dmareset(int, int, int, int, int, int, ulong);
 void	dmafree(int);
 
 ulong	dmastart(int, ulong, int);
diff --git a/bitsy/trap.c b/bitsy/trap.c
index 940bfb845fc37221d5f3c1e420dd1ce4b60529ce..7c1a1484ee7381388d4840d9540594669e224ec8 100644
--- a/bitsy/trap.c
+++ b/bitsy/trap.c
@@ -146,7 +146,7 @@ gpiointrenable(ulong bit, int edge, void (*f)(Ureg*, void*), void* a, char *name
 
 	/* it had better be input */
 	if(bit & gpioregs->direction)
-		panic(""gpiointrenable %lux of output pin", bit);
+		panic("gpiointrenable %lux of output pin", bit);
 
 	/* set edge register */
 	switch(edge){