Line data    Source code

       1             : /*      $OpenBSD: spdmem_i2c.c,v 1.1 2010/03/22 21:20:58 miod Exp $     */
       2             : /* $NetBSD: spdmem.c,v 1.3 2007/09/20 23:09:59 xtraeme Exp $ */
       3             : 
       4             : /*
       5             :  * Copyright (c) 2007 Jonathan Gray <jsg@openbsd.org>
       6             :  *
       7             :  * Permission to use, copy, modify, and distribute this software for any
       8             :  * purpose with or without fee is hereby granted, provided that the above
       9             :  * copyright notice and this permission notice appear in all copies.
      10             :  *
      11             :  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      12             :  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      13             :  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      14             :  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      15             :  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      16             :  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      17             :  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
      18             :  */
      19             : 
      20             : /*
      21             :  * Copyright (c) 2007 Nicolas Joly
      22             :  * Copyright (c) 2007 Paul Goyette
      23             :  * Copyright (c) 2007 Tobias Nygren
      24             :  * All rights reserved.
      25             :  *
      26             :  * Redistribution and use in source and binary forms, with or without
      27             :  * modification, are permitted provided that the following conditions
      28             :  * are met:
      29             :  * 1. Redistributions of source code must retain the above copyright
      30             :  *    notice, this list of conditions and the following disclaimer.
      31             :  * 2. Redistributions in binary form must reproduce the above copyright
      32             :  *    notice, this list of conditions and the following disclaimer in the
      33             :  *    documentation and/or other materials provided with the distribution.
      34             :  * 3. The name of the author may not be used to endorse or promote products
      35             :  *    derived from this software without specific prior written permission.
      36             :  *
      37             :  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
      38             :  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
      39             :  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
      40             :  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
      41             :  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
      42             :  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
      43             :  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
      44             :  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
      45             :  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      46             :  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
      47             :  * POSSIBILITY OF SUCH DAMAGE.
      48             :  */
      49             : 
      50             : /*
      51             :  * Serial Presence Detect (SPD) memory identification
      52             :  */
      53             : 
      54             : #include <sys/param.h>
      55             : #include <sys/systm.h>
      56             : #include <sys/device.h>
      57             : 
      58             : #include <dev/spdmemvar.h>
      59             : #include <dev/i2c/i2cvar.h>
      60             : 
      61             : struct spdmem_iic_softc {
      62             :         struct spdmem_softc     sc_base;
      63             :         i2c_tag_t               sc_tag;
      64             :         i2c_addr_t              sc_addr;
      65             : };
      66             : 
      67             : int     spdmem_iic_match(struct device *, void *, void *);
      68             : void    spdmem_iic_attach(struct device *, struct device *, void *);
      69             : uint8_t spdmem_iic_read(struct spdmem_softc *, uint8_t);
      70             : 
      71             : struct cfattach spdmem_iic_ca = {
      72             :         sizeof(struct spdmem_iic_softc), spdmem_iic_match, spdmem_iic_attach
      73             : };
      74             : 
      75             : int
      76           0 : spdmem_iic_match(struct device *parent, void *match, void *aux)
      77             : {
      78           0 :         struct i2c_attach_args *ia = aux;
      79           0 :         struct spdmem_iic_softc sc;
      80             : 
      81             :         /* clever attachments like openfirmware informed macppc */      
      82           0 :         if (strcmp(ia->ia_name, "spd") == 0)
      83           0 :                 return (1);
      84             : 
      85             :         /* dumb, need sanity checks */
      86           0 :         if (strcmp(ia->ia_name, "eeprom") != 0)
      87           0 :                 return (0);
      88             : 
      89           0 :         sc.sc_tag = ia->ia_tag;
      90           0 :         sc.sc_addr = ia->ia_addr;
      91           0 :         sc.sc_base.sc_read = spdmem_iic_read;
      92             : 
      93           0 :         return spdmem_probe(&sc.sc_base);
      94           0 : }
      95             : 
      96             : void
      97           0 : spdmem_iic_attach(struct device *parent, struct device *self, void *aux)
      98             : {
      99           0 :         struct spdmem_iic_softc *sc = (struct spdmem_iic_softc *)self;
     100           0 :         struct i2c_attach_args *ia = aux;
     101             : 
     102           0 :         sc->sc_tag = ia->ia_tag;
     103           0 :         sc->sc_addr = ia->ia_addr;
     104           0 :         sc->sc_base.sc_read = spdmem_iic_read;
     105             : 
     106           0 :         printf(":");
     107             : 
     108           0 :         spdmem_attach_common(&sc->sc_base);
     109           0 : }
     110             : 
     111             : uint8_t
     112           0 : spdmem_iic_read(struct spdmem_softc *v, uint8_t reg)
     113             : {
     114           0 :         struct spdmem_iic_softc *sc = (struct spdmem_iic_softc *)v;
     115           0 :         uint8_t val = 0xff;
     116             : 
     117           0 :         iic_acquire_bus(sc->sc_tag,0);
     118           0 :         iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
     119             :             &reg, sizeof reg, &val, sizeof val, 0);
     120           0 :         iic_release_bus(sc->sc_tag, 0);
     121             : 
     122           0 :         return val;
     123           0 : }