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      1 /*	$NetBSD: if_iee_sbdio.c,v 1.13 2020/07/22 01:24:40 msaitoh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2003 Jochen Kunz.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of Jochen Kunz may not be used to endorse or promote
     16  *    products derived from this software without specific prior
     17  *    written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY JOCHEN KUNZ
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL JOCHEN KUNZ
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: if_iee_sbdio.c,v 1.13 2020/07/22 01:24:40 msaitoh Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/bus.h>
     37 #include <sys/device.h>
     38 #include <sys/intr.h>
     39 #include <sys/mbuf.h>
     40 #include <sys/socket.h>
     41 #include <sys/systm.h>
     42 
     43 #include <net/if.h>
     44 #include <net/if_dl.h>
     45 #include <net/if_media.h>
     46 #include <net/if_ether.h>
     47 
     48 #include <mips/cache.h>
     49 #include <mips/locore.h>
     50 #include <machine/sbdvar.h>	/* for ether_addr() */
     51 #include <machine/sbdiovar.h>
     52 
     53 #include <dev/ic/i82596reg.h>
     54 #include <dev/ic/i82596var.h>
     55 
     56 int iee_sbdio_match(device_t, cfdata_t, void *);
     57 void iee_sbdio_attach(device_t, device_t, void *);
     58 int iee_sbdio_cmd(struct iee_softc *, uint32_t);
     59 int iee_sbdio_reset(struct iee_softc *);
     60 
     61 static void iee_sbdio_channel_attention(void *);
     62 static void iee_sbdio_chip_reset(void *);
     63 static void iee_sbdio_set_scp(void *, uint32_t);
     64 
     65 struct iee_sbdio_softc {
     66 	struct iee_softc sc_iee;
     67 	volatile uint32_t *sc_port;	/* CPU <-> i82596 interface */
     68 };
     69 
     70 CFATTACH_DECL_NEW(iee_sbdio, sizeof(struct iee_sbdio_softc),
     71     iee_sbdio_match, iee_sbdio_attach, NULL, NULL);
     72 
     73 int
     74 iee_sbdio_match(device_t parent, cfdata_t cf, void *aux)
     75 {
     76 	struct sbdio_attach_args *sa = aux;
     77 
     78 	return strcmp(sa->sa_name, "iee") ? 0 : 1;
     79 }
     80 
     81 void
     82 iee_sbdio_attach(device_t parent, device_t self, void *aux)
     83 {
     84 	struct iee_sbdio_softc *sc_ssc = device_private(self);
     85 	struct iee_softc *sc = &sc_ssc->sc_iee;
     86 	struct sbdio_attach_args *sa = aux;
     87 	uint8_t eaddr[ETHER_ADDR_LEN];
     88 	int media[2];
     89 
     90 	sc->sc_dev = self;
     91 	sc_ssc->sc_port =
     92 	    (volatile uint32_t *)MIPS_PHYS_TO_KSEG1(sa->sa_addr1);
     93 	sc->sc_type = I82596_CA;
     94 	sc->sc_flags = IEE_NEED_SWAP;
     95 
     96 	/* bus_dma round the dma size to page size. */
     97 	sc->sc_cl_align = 1;
     98 
     99 	sc->sc_dmat = sa->sa_dmat;
    100 
    101 	/* Setup SYSBUS byte. TR2 specific? -uch */
    102 	sc->sc_sysbus = IEE_SYSBUS_BE | IEE_SYSBUS_INT |
    103 	    IEE_SYSBUS_LIEAR | IEE_SYSBUS_STD;
    104 
    105 	sc->sc_iee_reset = iee_sbdio_reset;
    106 	sc->sc_iee_cmd = iee_sbdio_cmd;
    107 	sc->sc_mediachange = NULL;
    108 	sc->sc_mediastatus = NULL;
    109 
    110 	media[0] = IFM_ETHER | IFM_MANUAL;
    111 	media[1] = IFM_ETHER | IFM_10_5;
    112 
    113 	intr_establish(sa->sa_irq, iee_intr, sc);
    114 	(*platform.ether_addr)(eaddr);
    115 	iee_attach(sc, eaddr, media, 2, IFM_ETHER | IFM_10_5);
    116 }
    117 
    118 int
    119 iee_sbdio_cmd(struct iee_softc *sc, uint32_t cmd)
    120 {
    121 	int retry = 8;
    122 	int n;
    123 	uint32_t ack;
    124 
    125 	SC_SCB(sc)->scb_cmd = cmd;
    126 	IEE_SCBSYNC(sc, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
    127 
    128 	iee_sbdio_channel_attention(sc);
    129 
    130 	/* Wait for the cmd to finish */
    131 	for (n = 0 ; n < retry; n++) {
    132 		IEE_SCBSYNC(sc, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
    133 		ack = SC_SCB(sc)->scb_cmd;
    134 		IEE_SCBSYNC(sc, BUS_DMASYNC_PREREAD);
    135 		if (ack == 0)
    136 			break;
    137 		delay(1);
    138 	}
    139 	if (n < retry)
    140 		return 0;
    141 
    142 	printf("%s: command timeout. retry=%d\n",
    143 	    device_xname(sc->sc_dev), retry);
    144 
    145 	return -1;
    146 }
    147 
    148 int
    149 iee_sbdio_reset(struct iee_softc *sc)
    150 {
    151 #define	IEE_ISCP_BUSY 0x1
    152 	int n, retry = 8;
    153 	uint32_t cmd, ack;
    154 
    155 	/* Make sure the busy byte is set and the cache is flushed. */
    156 	SC_ISCP(sc)->iscp_busy = IEE_ISCP_BUSY;
    157 	IEE_ISCPSYNC(sc, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
    158 
    159 	/* Setup the PORT Command with pointer to SCP. */
    160 	cmd = IEE_PORT_SCP | IEE_PHYS_SHMEM(sc->sc_scp_off);
    161 
    162 	/* Initiate a Hardware reset. */
    163 	printf("%s: resetting chip... ", device_xname(sc->sc_dev));
    164 	iee_sbdio_chip_reset(sc);
    165 
    166 	/* Set SCP address to CU */
    167 	iee_sbdio_set_scp(sc, cmd);
    168 
    169 	/* Wait for the chip to initialize and read SCP and ISCP. */
    170 	for (n = 0 ; n < retry; n++) {
    171 		IEE_ISCPSYNC(sc, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
    172 		ack = SC_ISCP(sc)->iscp_busy;
    173 		IEE_ISCPSYNC(sc, BUS_DMASYNC_PREREAD);
    174 		if (ack != IEE_ISCP_BUSY) {
    175 			break;
    176 		}
    177 		delay(100);
    178 	}
    179 
    180 	if (n < retry) {
    181 		/* ACK interrupts we may have caused */
    182 		sc->sc_iee_cmd(sc, IEE_SCB_ACK);
    183 		printf("done.\n");
    184 
    185 		return 0;
    186 	}
    187 	printf("time out.\n");
    188 
    189 	return -1;
    190 }
    191 
    192 static void
    193 iee_sbdio_channel_attention(void *cookie)
    194 {
    195 	struct iee_sbdio_softc *sc = cookie;
    196 	uint32_t dummy;
    197 
    198 	/* Issue a Channel Attention */
    199 	dummy = *sc->sc_port;
    200 	dummy = *sc->sc_port;
    201 	__USE(dummy);
    202 }
    203 
    204 static void
    205 iee_sbdio_chip_reset(void *cookie)
    206 {
    207 	struct iee_sbdio_softc *sc = cookie;
    208 
    209 	*sc->sc_port = 0;
    210 	*sc->sc_port = 0;
    211 	delay(10);
    212 }
    213 
    214 static void
    215 iee_sbdio_set_scp(void *cookie, uint32_t cmd)
    216 {
    217 	struct iee_sbdio_softc *sc = cookie;
    218 	cmd = (cmd << 16) | (cmd >> 16);
    219 
    220 	*sc->sc_port = cmd;
    221 	*sc->sc_port = cmd;
    222 
    223 	/* Issue a Channel Attention to read SCP */
    224 	iee_sbdio_channel_attention(cookie);
    225 }
    226