bcm, bcm64: add vcore support for raspberry pi 3 GPIO expander

sys/src/9/bcm/fns.h

@@ -32,6 +32,7 @@ extern void dmaflush(int, void*, ulong);
 extern void dmastart(int, int, int, void*, void*, int);
 extern int dmawait(int);
 extern uintptr dmaaddr(void *va);
+extern void egpset(uint, int);
 extern int fbblank(int);
 extern void* fbinit(int, int*, int*, int*);
 extern u32int farget(void);

sys/src/9/bcm/vcore.c

@@ -40,9 +40,18 @@ enum {
 	TagGetpower	= 0x00020001,
 	TagSetpower	= 0x00028001,
 		Powerwait	= 1<<1,
-	TagGetclkspd= 0x00030002,
+	TagGetclkstate	= 0x00030001,
-	TagGetclkmax= 0x00030004,
+	TagGetclkspd	= 0x00030002,
-	TagSetclkspd= 0x00038002,
+	TagGetclkmax	= 0x00030004,
+	TagSetclkstate	= 0x00038001,
+	TagSetclkspd	= 0x00038002,
+
+	TagGetEgpioState= 0x00030041,
+	TagSetEgpioState= 0x00038041,
+	TagSetSdhostClk	= 0x00038042,
+	TagGetEgpioConf	= 0x00030043,
+	TagSetEgpioConf	= 0x00038043,
+
 	TagGettemp	= 0x00030006,
 	TagFballoc	= 0x00040001,
 	TagFbfree	= 0x00048001,
@@ -388,3 +397,18 @@ vgpset(uint port, int on)
 	vgpio.counts[port] = (vgpio.incs << 16) | vgpio.decs;
 	vgpio.ison = on;
 }
+
+/*
+ * Raspberry Pi GPIO expander (Pi 3 and 4)
+ */
+void
+egpset(uint port, int on)
+{
+	u32int buf[2];
+
+	if(port >= 8)
+		return;
+	buf[0] = 128 + port;
+	buf[1] = on;
+	vcreq(TagSetEgpioState, buf, sizeof(buf), sizeof(buf));
+}

sys/src/9/bcm64/fns.h

@@ -164,6 +164,7 @@ extern void setclkrate(int clkid, ulong hz);
 extern uint getcputemp(void);
 extern void vgpinit(void);
 extern void vgpset(uint port, int on);
+extern void egpset(uint port, int on);
 
 /* bootargs */
 extern void bootargsinit(uintptr);