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
347  * en_b2sz: convert a DMA burst code to its byte size
369  * en_sz2b: convert a burst size (bytes) to DMA burst code
420  * DMA maps
429  * to allocate the DMA map yet have no means to signal this error. Therefor
449 		device_printf(sc->dev, "cannot create DMA map %d\n", err);
498  * Argument structure to load a transmit DMA map
511  * TX DMA map loader helper. This function is the callback when the map
512  * is loaded. It should fill the DMA segment descriptors into the hardware.
545 	 * Local macro to add an entry to the transmit DMA area. If there
565 	 * Local macro to generate a DMA entry to DMA cnt bytes. Updates
594 		/* update DMA address */
616 		 * do we need to do a DMA op to align to the maximum
670 		/* update DMA address */
694  * en_txdma: start transmit DMA on the given channel, if possible
718 	 * get an mbuf waiting for DMA
1696  * TX DMA interrupt
1698  * check for TX DMA complete, if detected then this means
1798  * Handle a receive DMA completion
1810 	m = NULL;	/* assume "JK" trash DMA */
1870  * check for RX DMA complete, and pass the data "upstairs"
1997 		panic("too many DMA segments");
2008 	 * Local macro to add an entry to the receive DMA area. If there
2028 	 * Local macro to generate a DMA entry to DMA cnt bytes. Updates
2046 		/* update DMA address */
2071 		 * do we need to do a DMA op to align to the maximum
2116 		/* update DMA address */
2528  * Probing the DMA brokeness of the card
2532  * Physical address load helper function for DMA probe
2546  * see how the card handles DMA by running a few DMA tests.   we need
2547  * to figure out the largest number of bytes we can DMA in one burst
2553  * we more than 4 bytes fails (with an RX DMA timeout) for physical
2561  * en_dmaprobe_doit: do actual testing for the DMA test.
2594 	/* enable DMA (only) */
2601 	 * try it now . . .  DMA it out, then DMA it back in and compare
2607 	DBG(sc, DMA, ("test sp=%p/%#lx, dp=%p/%#lx",
2610 		DBG(sc, DMA, ("test lcv=%d", lcv));
2619 		/* build lcv-byte-DMA x NBURSTS */
2635 				DBG(sc, DMA, ("unexpected timeout in tx "
2636 				    "DMA test\n  alignment=0x%lx, burst size=%d"
2647 			DBG(sc, DMA, ("unexpected status in tx DMA test: %#x\n",
2651 		/* re-enable DMA (only) */
2656 		/* build lcv-byte-DMA x NBURSTS */
2672 				DBG(sc, DMA, ("unexpected timeout in rx "
2673 				    "DMA test, rdrx=%#x\n", reg));
2679 			DBG(sc, DMA, ("unexpected status in rx DMA "
2684 			DBG(sc, DMA, ("DMA test failed! lcv=%d, sp=%p, "
2691 	return (retval);	/* studly 64 byte DMA present!  oh baby!! */
2695  * Find the best DMA parameters
2714 	 * Allocate some DMA-able memory.
2722 		panic("%s: cannot create test DMA tag %d", __func__, err);
2726 		panic("%s: cannot allocate test DMA memory %d", __func__, err);
2731 		panic("%s: cannot load test DMA map %d", __func__, err);
2733 	DBG(sc, DMA, ("phys=%#lx addr=%p", (u_long)phys, addr));
2763 	 * to DMA.
2769 	DELAY(10000);			/* may still do DMA */
2772 	 * Free the DMA stuff
2829 	 * determine the largest DMA burst supported
2875 			    "passed 64 byte DMA test\n");
2877 			device_printf(sc->dev, "FAILED DMA TEST: "
2882 		device_printf(sc->dev, "maximum DMA burst length = %d "
3067 	 * destroy the DMA maps using the tag)