dev/en/midway.c

65  * "transmit DMA complete" interrupt.   using the "telnet" test I got data
70  * just fine with byte DMA.
106 	DBG_DMA		= 0x0040,	/* debug DMA probing */
220  * While a transmit mbuf is waiting to get transmit DMA resources we
348  * en_b2sz: convert a DMA burst code to its byte size
371  * en_sz2b: convert a burst size (bytes) to DMA burst code
422  * DMA maps
431  * to allocate the DMA map yet have no means to signal this error. Therefor
451 		device_printf(sc->dev, "cannot create DMA map %d\n", err);
500  * Argument structure to load a transmit DMA map
513  * TX DMA map loader helper. This function is the callback when the map
514  * is loaded. It should fill the DMA segment descriptors into the hardware.
547 	 * Local macro to add an entry to the transmit DMA area. If there
567 	 * Local macro to generate a DMA entry to DMA cnt bytes. Updates
596 		/* update DMA address */
618 		 * do we need to do a DMA op to align to the maximum
672 		/* update DMA address */
696  * en_txdma: start transmit DMA on the given channel, if possible
720 	 * get an mbuf waiting for DMA
1698  * TX DMA interrupt
1700  * check for TX DMA complete, if detected then this means
1800  * Handle a receive DMA completion
1812 	m = NULL;	/* assume "JK" trash DMA */
1872  * check for RX DMA complete, and pass the data "upstairs"
1999 		panic("too many DMA segments");
2010 	 * Local macro to add an entry to the receive DMA area. If there
2030 	 * Local macro to generate a DMA entry to DMA cnt bytes. Updates
2048 		/* update DMA address */
2073 		 * do we need to do a DMA op to align to the maximum
2118 		/* update DMA address */
2530  * Probing the DMA brokeness of the card
2534  * Physical address load helper function for DMA probe
2548  * see how the card handles DMA by running a few DMA tests.   we need
2549  * to figure out the largest number of bytes we can DMA in one burst
2555  * we more than 4 bytes fails (with an RX DMA timeout) for physical
2563  * en_dmaprobe_doit: do actual testing for the DMA test.
2596 	/* enable DMA (only) */
2603 	 * try it now . . .  DMA it out, then DMA it back in and compare
2609 	DBG(sc, DMA, ("test sp=%p/%#lx, dp=%p/%#lx",
2612 		DBG(sc, DMA, ("test lcv=%d", lcv));
2621 		/* build lcv-byte-DMA x NBURSTS */
2637 				DBG(sc, DMA, ("unexpected timeout in tx "
2638 				    "DMA test\n  alignment=0x%lx, burst size=%d"
2649 			DBG(sc, DMA, ("unexpected status in tx DMA test: %#x\n",
2653 		/* re-enable DMA (only) */
2658 		/* build lcv-byte-DMA x NBURSTS */
2674 				DBG(sc, DMA, ("unexpected timeout in rx "
2675 				    "DMA test, rdrx=%#x\n", reg));
2681 			DBG(sc, DMA, ("unexpected status in rx DMA "
2686 			DBG(sc, DMA, ("DMA test failed! lcv=%d, sp=%p, "
2693 	return (retval);	/* studly 64 byte DMA present!  oh baby!! */
2697  * Find the best DMA parameters
2716 	 * Allocate some DMA-able memory.
2724 		panic("%s: cannot create test DMA tag %d", __func__, err);
2728 		panic("%s: cannot allocate test DMA memory %d", __func__, err);
2733 		panic("%s: cannot load test DMA map %d", __func__, err);
2735 	DBG(sc, DMA, ("phys=%#lx addr=%p", (u_long)phys, addr));
2765 	 * to DMA.
2771 	DELAY(10000);			/* may still do DMA */
2774 	 * Free the DMA stuff
2831 	 * determine the largest DMA burst supported
2877 			    "passed 64 byte DMA test\n");
2879 			device_printf(sc->dev, "FAILED DMA TEST: "
2884 		device_printf(sc->dev, "maximum DMA burst length = %d "
3069 	 * destroy the DMA maps using the tag)