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

--- a/sys/src/9/bcm/fns.h

+++ b/sys/src/9/bcm/fns.h

@@ -32,6 +32,7 @@

 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);

--- a/sys/src/9/bcm/vcore.c

+++ b/sys/src/9/bcm/vcore.c

@@ -40,9 +40,18 @@

 	TagGetpower	= 0x00020001,

 	TagSetpower	= 0x00028001,

 		Powerwait	= 1<<1,

-	TagGetclkspd= 0x00030002,

-	TagGetclkmax= 0x00030004,

-	TagSetclkspd= 0x00038002,

+	TagGetclkstate	= 0x00030001,

+	TagGetclkspd	= 0x00030002,

+	TagGetclkmax	= 0x00030004,

+	TagSetclkstate	= 0x00038001,

+	TagSetclkspd	= 0x00038002,

+

+	TagGetEgpioState= 0x00030041,

+	TagSetEgpioState= 0x00038041,

+	TagSetSdhostClk	= 0x00038042,

+	TagGetEgpioConf	= 0x00030043,

+	TagSetEgpioConf	= 0x00038043,

+

 	TagGettemp	= 0x00030006,

 	TagFballoc	= 0x00040001,

 	TagFbfree	= 0x00048001,

@@ -387,4 +396,19 @@

 		vgpio.decs++;

 	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));

 }

--- a/sys/src/9/bcm64/fns.h

+++ b/sys/src/9/bcm64/fns.h

@@ -164,6 +164,7 @@

 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);