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 spdmem_iic_match(struct device *parent, void *match, void *aux) 77 { 78 struct i2c_attach_args *ia = aux; 79 struct spdmem_iic_softc sc; 80 81 /* clever attachments like openfirmware informed macppc */ 82 if (strcmp(ia->ia_name, "spd") == 0) 83 return (1); 84 85 /* dumb, need sanity checks */ 86 if (strcmp(ia->ia_name, "eeprom") != 0) 87 return (0); 88 89 sc.sc_tag = ia->ia_tag; 90 sc.sc_addr = ia->ia_addr; 91 sc.sc_base.sc_read = spdmem_iic_read; 92 93 return spdmem_probe(&sc.sc_base); 94 } 95 96 void 97 spdmem_iic_attach(struct device *parent, struct device *self, void *aux) 98 { 99 struct spdmem_iic_softc *sc = (struct spdmem_iic_softc *)self; 100 struct i2c_attach_args *ia = aux; 101 102 sc->sc_tag = ia->ia_tag; 103 sc->sc_addr = ia->ia_addr; 104 sc->sc_base.sc_read = spdmem_iic_read; 105 106 printf(":"); 107 108 spdmem_attach_common(&sc->sc_base); 109 } 110 111 uint8_t 112 spdmem_iic_read(struct spdmem_softc *v, uint8_t reg) 113 { 114 struct spdmem_iic_softc *sc = (struct spdmem_iic_softc *)v; 115 uint8_t val = 0xff; 116 117 iic_acquire_bus(sc->sc_tag,0); 118 iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, 119 ®, sizeof reg, &val, sizeof val, 0); 120 iic_release_bus(sc->sc_tag, 0); 121 122 return val; 123 } 124