C++ (Cpp) dmastart Examples

Example #1

File: spi.c Project: Mekapaedia/inferno-rpi

void
spirw(uint cs, void *buf, int len)
{
	Spiregs *r;

	assert(cs <= 2);
	assert(len < (1<<16));
	qlock(&spi.lock);
	if(waserror()){
		qunlock(&spi.lock);
		nexterror();
	}
	if(spi.regs == 0)
		spiinit();
	r = spi.regs;
	r->dlen = len;
	r->cs = (cs << Csshift) | Rxclear | Txclear | Dmaen | Adcs | Ta;
	/*
	 * Start write channel before read channel - cache wb before inv
	 */
	dmastart(DmaChanSpiTx, DmaDevSpiTx, DmaM2D,
		buf, &r->data, len);
	dmastart(DmaChanSpiRx, DmaDevSpiRx, DmaD2M,
		&r->data, buf, len);
	if(dmawait(DmaChanSpiRx) < 0)
		error(Eio);
	cachedinvse(buf, len);
	r->cs = 0;
	qunlock(&spi.lock);
	poperror();
}

Example #2

File: dma.c Project: carriercomm/plan9-gpl

/*
 * try to confirm sane operation
 */
void
dmatest(void)
{
	int n, done;
	uchar *bp;
	static ulong pat = 0x87654321;
	static Rendez trendez;

	if (up == nil)
		panic("dmatest: up not set yet");
	bp = (uchar *)KADDR(PHYSDRAM + 128*MB);
	memset(bp, Testbyte, Scratch);
	done = 0;
	dmastart((void *)PADDR(bp), Postincr, (void *)PADDR(&pat), Const,
		Testsize, &trendez, &done);
	sleep(&trendez, istestdmadone, &done);
	cachedinvse(bp, Scratch);

	if (((ulong *)bp)[0] != pat)
		panic("dmainit: copied incorrect data %#lux != %#lux",
			((ulong *)bp)[0], pat);
	for (n = Testsize; n < Scratch && bp[n] != Testbyte; n++)
		;
	if (n >= Scratch)
		panic("dmainit: ran wild over memory, clobbered ≥%,d bytes", n);
	if (bp[n] == Testbyte && n != Testsize)
		iprint("dma: %d-byte dma stopped after %d bytes!\n",
			Testsize, n);
}

Example #3

File: emmc.c Project: 0intro/plan9-contrib

static void
emmcio(int write, uchar *buf, int len)
{
	u32int *r;
	int i;

	r = (u32int*)EMMCREGS;
	assert((len&3) == 0);
	okay(1);
	if(waserror()){
		okay(0);
		nexterror();
	}
	if(write)
		dmastart(DmaChanEmmc, DmaDevEmmc, DmaM2D,
			buf, &r[Data], len);
	else
		dmastart(DmaChanEmmc, DmaDevEmmc, DmaD2M,
			&r[Data], buf, len);
	if(dmawait(DmaChanEmmc) < 0)
		error(Eio);
	if(!write)
		cachedinvse(buf, len);
	WR(Irpten, Datadone|Err);
	tsleep(&emmc.r, datadone, 0, 3000);
	WR(Irpten, 0);
	emmc.datadone = 0;
	i = r[Interrupt];
	if((i & Datadone) == 0){
		print("emmcio: %d timeout intr %ux stat %ux\n",
			write, i, r[Status]);
		WR(Interrupt, i);
		error(Eio);
	}
	if(i & Err){
		print("emmcio: %d error intr %ux stat %ux\n",
			write, r[Interrupt], r[Status]);
		WR(Interrupt, i);
		error(Eio);
	}
	if(i)
		WR(Interrupt, i);
	poperror();
	okay(0);
}