From 446d66db9df0f6e12e316980448a196ad9fb1cfb Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Thu, 23 Nov 2000 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2000-11-23

---
 bitsy/devuda1341.c | 19 ++++++++--------
 bitsy/fns.h        |  2 --
 bitsy/io.h         | 16 +++++++-------
 bitsy/power.c      | 55 +++++++++++++++++++++++++++++++++++++++-------
 4 files changed, 64 insertions(+), 28 deletions(-)

diff --git a/bitsy/devuda1341.c b/bitsy/devuda1341.c
index 9f6e0fcfb9f20e6fc6060b5e03f3d3c33fd6f089..5b0ec491cf57f2ec254fb54992829ce668e96622 100644
--- a/bitsy/devuda1341.c
+++ b/bitsy/devuda1341.c
@@ -624,8 +624,6 @@ outdisable(void) {
 static void
 inenable(void) {
 	/* turn on ADC, set input gain switch */
-//	egpiobits(EGPIO_audio_power, 1);
-//	audiomute(0);
 	status1 |= 0x22;
 	L3_write(UDA1341_L3Addr | UDA1341_STATUS, (uchar*)&status1, 1);
 	if (debug) {
@@ -644,20 +642,21 @@ indisable(void) {
 	}
 }
 
-static void
-disable(void) {
-	egpiobits(EGPIO_audio_ic_power | EGPIO_codec_reset, 0);
-}
-
-static 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 */
-		egpiobits(EGPIO_audio_power, 0);
-		egpiobits(EGPIO_audio_ic_power | EGPIO_codec_reset, 0);
+		if (audio.omode & Aread)
+			indisable();
+		if (audio.omode & Awrite)
+			outdisable();
+		egpiobits(EGPIO_audio_ic_power | EGPIO_codec_reset | EGPIO_audio_power, 0);
 	}
 }
 
diff --git a/bitsy/fns.h b/bitsy/fns.h
index 2bc3e93d85a402642ecbc34fe90e7ba77b0b1374..e52db50e645ea7642687012d97ce4a4b5325ccda 100644
--- a/bitsy/fns.h
+++ b/bitsy/fns.h
@@ -1,8 +1,6 @@
 #include "../port/portfns.h"
 
-void	amplifierpower(int);
 void	audiopower(int);
-void	audiomute(int);
 void	cacheflush(void);
 void	cachewb(void);
 void	cachewbaddr(void*);
diff --git a/bitsy/io.h b/bitsy/io.h
index b17235eb5f0242fc2e8f59002df39ccb1ef8c0e4..15abcd2d4ead0ae64f0e76fc8edb50b50dd9ed36 100644
--- a/bitsy/io.h
+++ b/bitsy/io.h
@@ -248,13 +248,13 @@ extern MemConfRegs *memconfregs;
 typedef struct PowerRegs PowerRegs;
 struct PowerRegs
 {
-	ulong	pmcr;
-	ulong	pssr;
-	ulong	pspr;
-	ulong	pwer;
-	ulong	pcfr;
-	ulong	ppcr;
-	ulong	pgsr;
-	ulong	posr;
+	ulong	pmcr;	/* Power manager control register */
+	ulong	pssr;	/* Power manager sleep status register */
+	ulong	pspr;	/* Power manager scratch pad register */
+	ulong	pwer;	/* Power manager wakeup enable register */
+	ulong	pcfr;	/* Power manager general configuration register */
+	ulong	ppcr;	/* Power manager PPL configuration register */
+	ulong	pgsr;	/* Power manager GPIO sleep state register */
+	ulong	posr;	/* Power manager oscillator status register */
 };
 extern PowerRegs *powerregs;
diff --git a/bitsy/power.c b/bitsy/power.c
index 32a97d082753647d5c27aa03dbaecb77051bdc03..091b48218c80222562242bbb200eec43d1d89a7e 100644
--- a/bitsy/power.c
+++ b/bitsy/power.c
@@ -10,17 +10,56 @@
 
 /* Power management for the bitsy */
 
+int powerup;
+
+enum {
+	pmcr_sf		= 0,
+
+	pcfr_opde	= 0,
+	pcfr_fp		= 1,
+	pcfr_fs		= 2,
+	pcfr_fo		= 3,
+};
+
 static void
-powerintr(Ureg*, void *x)
+onoffintr(Ureg*, void *x)
 {
-	/* Power button interrupt */
+	/* On/off button interrupt */
 	int i;
 
-	/* debounce, 50 ms*/
-	for (i = 0; i < 50; i++) {
-		delay(1);
-		if ((gpioregs->level & GPIO_PWR_ON_i) == 0)
-			return;	/* bounced */
+	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();
 	}
-	rs232power(0);
+}
+
+static void
+sa1100_power_off(void)
+{
+	delay(100);
+	splhi();
+	/* disable internal oscillator, float CS lines */
+	powerregs->pcfr = 1<<pcfr_opde | 1<<pcfr_fp | 1<<pcfr_fs;
+	/* set lowest clock */
+	powerregs->ppcr = 0;
+	/* set all GPIOs to input mode */
+	gpioregs->direction = 0;
+	/* enter sleep mode */
+	powerregs->pmcr = 1<<pmcr_sf;
 }