1/* $NetBSD: i80312_i2c.c,v 1.5 2011/07/01 20:32:51 dyoung Exp $ */ 2 3/* 4 * Copyright (c) 2003 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38/* 39 * Intel i80321 I/O Processor I2C Controller Unit support. 40 */ 41 42#include <sys/cdefs.h> 43__KERNEL_RCSID(0, "$NetBSD: i80312_i2c.c,v 1.5 2011/07/01 20:32:51 dyoung Exp $"); 44 45#include <sys/param.h> 46#include <sys/mutex.h> 47#include <sys/systm.h> 48#include <sys/device.h> 49#include <sys/kernel.h> 50 51#include <sys/bus.h> 52#include <machine/intr.h> 53 54#include <arm/xscale/i80312var.h> 55 56#include <dev/i2c/i2cvar.h> 57 58#include <arm/xscale/iopi2cvar.h> 59#include <arm/xscale/iopi2creg.h> 60 61static int 62iic312_match(device_t parent, cfdata_t cf, void *aux) 63{ 64 struct iopxs_attach_args *ia = aux; 65 66 if (strcmp(cf->cf_name, ia->ia_name) == 0) 67 return (1); 68 69 return (0); 70} 71 72static void 73iic312_attach(device_t parent, device_t self, void *aux) 74{ 75 struct iopiic_softc *sc = device_private(self); 76 struct iopxs_attach_args *ia = aux; 77 int error; 78 79 aprint_naive(": I2C controller\n"); 80 aprint_normal(": I2C controller\n"); 81 82 sc->sc_dev = self; 83 sc->sc_st = ia->ia_st; 84 if ((error = bus_space_subregion(sc->sc_st, ia->ia_sh, 85 ia->ia_offset, ia->ia_size, 86 &sc->sc_sh)) != 0) { 87 aprint_error_dev(self, 88 "unable to subregion registers, error = %d\n", error); 89 return; 90 } 91 92 /* XXX Reset the I2C unit? */ 93 94 mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE); 95 96 /* XXX We don't currently use interrupts. Fix this some day. */ 97#if 0 98 sc->sc_ih = i80321_intr_establish(ICU_INT_I2C, IPL_BIO, 99 iopiic_intr, sc); 100 if (sc->sc_ih == NULL) { 101 aprint_error_dev(self, 102 "unable to establish interrupt handler\n"); 103 return; 104 } 105#endif 106 107 /* 108 * Enable the I2C unit as a master running at 100.0 kHz (ICCR=0x1f4 109 * per p.12-8 of the i80312 developer's manual). 110 * No, we do not support slave mode. 111 */ 112 sc->sc_icr = IIC_ICR_GCD | IIC_ICR_UE | IIC_ICR_SCLE; 113 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, 0); 114 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICCR, 0x1f4); 115 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ISAR, 0); 116 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, sc->sc_icr); 117 118 iopiic_attach(sc); 119} 120 121CFATTACH_DECL_NEW(iopiic, sizeof(struct iopiic_softc), 122 iic312_match, iic312_attach, NULL, NULL); 123