Annotation of sys/arch/arm/xscale/i80321_i2c.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: i80321_i2c.c,v 1.2 2006/07/10 15:39:56 drahn Exp $ */
! 2: /* $NetBSD: i80321_i2c.c,v 1.2 2005/12/11 12:16:51 christos Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 2003 Wasabi Systems, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * Written by Jason R. Thorpe for Wasabi Systems, Inc.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: * 3. All advertising materials mentioning features or use of this software
! 19: * must display the following acknowledgement:
! 20: * This product includes software developed for the NetBSD Project by
! 21: * Wasabi Systems, Inc.
! 22: * 4. The name of Wasabi Systems, Inc. may not be used to endorse
! 23: * or promote products derived from this software without specific prior
! 24: * written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 28: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 29: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
! 30: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 31: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 32: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 33: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 34: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 35: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 36: * POSSIBILITY OF SUCH DAMAGE.
! 37: */
! 38:
! 39: /*
! 40: * Intel i80321 I/O Processor I2C Controller Unit support.
! 41: */
! 42:
! 43: #include <sys/param.h>
! 44: #include <sys/lock.h>
! 45: #include <sys/systm.h>
! 46: #include <sys/device.h>
! 47: #include <sys/kernel.h>
! 48:
! 49: #include <machine/bus.h>
! 50: #include <machine/intr.h>
! 51:
! 52: #include <arm/xscale/i80321reg.h>
! 53: #include <arm/xscale/i80321var.h>
! 54:
! 55: #include <dev/i2c/i2cvar.h>
! 56:
! 57: #include <arm/xscale/iopi2creg.h>
! 58: #include <arm/xscale/iopi2cvar.h>
! 59:
! 60: int i80321_i2c_match(struct device *parent, void *v, void *aux);
! 61: void i80321_i2c_attach(struct device *parent, struct device *self, void *aux);
! 62:
! 63: struct cfattach i80321_i2c_ca = {
! 64: sizeof(struct iopiic_softc), i80321_i2c_match, i80321_i2c_attach
! 65: };
! 66:
! 67: int
! 68: i80321_i2c_match(struct device *parent, void *v, void *aux)
! 69: {
! 70: struct cfdata *cf = v;
! 71: struct iopxs_attach_args *ia = aux;
! 72:
! 73: /* XXX thecus will reboot if iopiic1 attaches */
! 74: if (ia->ia_offset == VERDE_I2C_BASE1)
! 75: return 0;
! 76:
! 77: if (strcmp(cf->cf_driver->cd_name, ia->ia_name) == 0)
! 78: return (1);
! 79:
! 80: return (0);
! 81: }
! 82:
! 83: void
! 84: i80321_i2c_attach(struct device *parent, struct device *self, void *aux)
! 85: {
! 86: struct iopiic_softc *sc = (void *) self;
! 87: struct iopxs_attach_args *ia = aux;
! 88: int error;
! 89: #ifdef LATER
! 90: uint8_t gpio_bits;
! 91: #endif
! 92:
! 93: printf(": I2C controller\n");
! 94:
! 95: sc->sc_st = ia->ia_st;
! 96: if ((error = bus_space_subregion(sc->sc_st, ia->ia_sh,
! 97: ia->ia_offset, ia->ia_size,
! 98: &sc->sc_sh)) != 0) {
! 99: printf("%s: unable to subregion registers, error = %d\n",
! 100: sc->sc_dev.dv_xname, error);
! 101: return;
! 102: }
! 103:
! 104: #ifdef LATER
! 105: gpio_bits = (ia->ia_offset == VERDE_I2C_BASE0) ?
! 106: (1U << 7) | (1U << 6) : (1U << 5) | (1U << 4);
! 107: i80321_gpio_set_val(gpio_bits, 0);
! 108: i80321_gpio_set_direction(gpio_bits, 0);
! 109: #endif
! 110:
! 111: /* XXX Reset the I2C unit? */
! 112:
! 113: lockinit(&sc->sc_buslock, PRIBIO|PCATCH, "iopiiclk", 0, 0);
! 114:
! 115: /* XXX We don't currently use interrupts. Fix this some day. */
! 116: #if 0
! 117: sc->sc_ih = i80321_intr_establish((ia->ia_offset == VERDE_I2C_BASE0) ?
! 118: ICU_INT_I2C0 : ICU_INT_I2C1, IPL_BIO, iopiic_intr, sc);
! 119: if (sc->sc_ih == NULL) {
! 120: aprint_error("%s: unable to establish interrupt handler\n",
! 121: sc->sc_dev.dv_xname);
! 122: return;
! 123: }
! 124: #endif
! 125:
! 126: /*
! 127: * Enable the I2C unit as a master.
! 128: * No, we do not support slave mode.
! 129: */
! 130: sc->sc_icr = IIC_ICR_GCD | IIC_ICR_UE | IIC_ICR_SCLE;
! 131: bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, 0);
! 132: bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ISAR, 0);
! 133: bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, sc->sc_icr);
! 134:
! 135: iopiic_attach(sc);
! 136: }
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