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bcm64/sdhc: add *emmc2bus kernel parameter to set dma dram bus address

On the raspberry pi 4, depending on the chip revision,
the emmc2 controller has different dram bus address window,
so make it configurable.

--- a/sys/src/9/bcm64/sdhc.c

+++ b/sys/src/9/bcm64/sdhc.c

@@ -199,11 +199,11 @@

 struct Ctlr {

 	Rendez	r;

-	Rendez	cardr;

 	int	fastclock;

 	ulong	extclk;

 	int	appcmd;

 	Adma	*dma;

+	uintptr	busdram;

 };

 static Ctlr emmc;

@@ -247,7 +247,7 @@

 			p->desc |= len<<OLength | End | Int;

 		else

 			p->desc |= Maxdma<<OLength;

-		p->addr = dmaaddr((void*)a);

+		p->addr = emmc.busdram + (PADDR(a) - PHYSDRAM);

 		a += Maxdma;

 		len -= Maxdma;

 		n--;

@@ -293,7 +293,11 @@

 {

 	u32int *r;

 	ulong clk;

+	char *s;

+	emmc.busdram = soc.busdram;

+	if((s = getconf("*emmc2bus")) != nil)

+		emmc.busdram = strtoull(s, nil, 16);

 	clk = getclkrate(ClkEmmc2);

 	if(clk == 0){

 		clk = Extfreq;

@@ -401,9 +405,9 @@

 		WR(Interrupt, i);

 	}

 	WR(Cmdtm, c);

-	now = m->ticks;

+	now = MACHP(0)->ticks;

 	while(((i=r[Interrupt])&(Cmddone|Err)) == 0)

-		if(m->ticks-now > HZ)

+		if(MACHP(0)->ticks - now > HZ)

 			break;

 	if((i&(Cmddone|Err)) != Cmddone){

 		if((i&~(Err|Cardintr)) != Ctoerr)

@@ -507,7 +511,7 @@

 		cachedwbse(buf, len);

 	else

 		cachedwbinvse(buf, len);

-	WR(Dmadesc, dmaaddr(emmc.dma));

+	WR(Dmadesc, emmc.busdram + (PADDR(emmc.dma) - PHYSDRAM));

 	okay(1);

 }

@@ -549,8 +553,6 @@

 	i = r[Interrupt];

 	if(i&(Datadone|Err))

 		wakeup(&emmc.r);

-	if(i&Cardintr)

-		wakeup(&emmc.cardr);

 	WR(Irpten, r[Irpten] & ~i);

 }