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dwc_gmac_var.h revision 1.1 
      1 /*-
      2  * Copyright (c) 2013, 2014 The NetBSD Foundation, Inc.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to The NetBSD Foundation
      6  * by Matt Thomas of 3am Software Foundry and Martin Husemann.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  * POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 
     31 /*
     32  * We could use 1024 DMA descriptors to fill up an 8k page (each is 16 byte).
     33  * However, on TX we probably will not need that many, and on RX we allocate
     34  * a full mbuf cluster for each, so secondary memory consumption will grow
     35  * rapidly.
     36  * So currently we waste half a page of dma memory and consume 512k Byte of
     37  * RAM for mbuf clusters.
     38  * XXX Maybe fine-tune later, or reconsider unsharing of RX/TX dmamap.
     39  */
     40 #define		AWGE_RX_RING_COUNT	256
     41 #define		AWGE_TX_RING_COUNT	256
     42 #define		AWGE_TOTAL_RING_COUNT	\
     43 			(AWGE_RX_RING_COUNT + AWGE_TX_RING_COUNT)
     44 
     45 #define		AWGE_MAX_PACKET		(ETHER_MAX_LEN + ETHER_VLAN_ENCAP_LEN)
     46 
     47 
     48 
     49 struct dwc_gmac_rx_data {
     50 	bus_dmamap_t	rd_map;
     51 	struct mbuf	*rd_m;
     52 };
     53 
     54 struct dwc_gmac_tx_data {
     55 	bus_dmamap_t	td_map;
     56 	bus_dmamap_t	td_active;
     57 	struct mbuf	*td_m;
     58 };
     59 
     60 struct dwc_gmac_tx_ring {
     61 	bus_addr_t			t_physaddr; /* PA of TX ring start */
     62 	struct dwc_gmac_dev_dmadesc	*t_desc;    /* VA of TX ring start */
     63 	struct dwc_gmac_tx_data	t_data[AWGE_TX_RING_COUNT];
     64 	int				t_cur, t_next, t_queued;
     65 };
     66 
     67 struct dwc_gmac_rx_ring {
     68 	bus_addr_t			r_physaddr; /* PA of RX ring start */
     69 	struct dwc_gmac_dev_dmadesc	*r_desc;    /* VA of RX ring start */
     70 	struct dwc_gmac_rx_data	r_data[AWGE_RX_RING_COUNT];
     71 	int				r_cur, r_next;
     72 	kmutex_t			r_mtx;
     73 };
     74 
     75 struct dwc_gmac_softc {
     76 	device_t sc_dev;
     77 	bus_space_tag_t sc_bst;
     78 	bus_space_handle_t sc_bsh;
     79 	bus_dma_tag_t sc_dmat;
     80 	struct ethercom sc_ec;
     81 	struct mii_data sc_mii;
     82 	kmutex_t sc_mdio_lock;
     83 	bus_dmamap_t sc_dma_ring_map;		/* common dma memory for RX */
     84 	bus_dma_segment_t sc_dma_ring_seg;	/* and TX ring */
     85 	struct dwc_gmac_rx_ring sc_rxq;
     86 	struct dwc_gmac_tx_ring sc_txq;
     87 };
     88 
     89 void dwc_gmac_attach(struct dwc_gmac_softc*, uint8_t*);
     90 int dwc_gmac_intr(struct dwc_gmac_softc*);
     91