Home | History | Annotate | Line # | Download | only in nslu2
nslu2_iic.c revision 1.1.14.1
      1  1.1.14.1  gdamore /*	$NetBSD: nslu2_iic.c,v 1.1.14.1 2006/07/13 17:48:46 gdamore Exp $	*/
      2       1.1      scw 
      3       1.1      scw /*-
      4       1.1      scw  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5       1.1      scw  * All rights reserved.
      6       1.1      scw  *
      7       1.1      scw  * This code is derived from software contributed to The NetBSD Foundation
      8       1.1      scw  * by Steve C. Woodford.
      9       1.1      scw  *
     10       1.1      scw  * Redistribution and use in source and binary forms, with or without
     11       1.1      scw  * modification, are permitted provided that the following conditions
     12       1.1      scw  * are met:
     13       1.1      scw  * 1. Redistributions of source code must retain the above copyright
     14       1.1      scw  *    notice, this list of conditions and the following disclaimer.
     15       1.1      scw  * 2. Redistributions in binary form must reproduce the above copyright
     16       1.1      scw  *    notice, this list of conditions and the following disclaimer in the
     17       1.1      scw  *    documentation and/or other materials provided with the distribution.
     18       1.1      scw  * 3. All advertising materials mentioning features or use of this software
     19       1.1      scw  *    must display the following acknowledgement:
     20       1.1      scw  *        This product includes software developed by the NetBSD
     21       1.1      scw  *        Foundation, Inc. and its contributors.
     22       1.1      scw  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23       1.1      scw  *    contributors may be used to endorse or promote products derived
     24       1.1      scw  *    from this software without specific prior written permission.
     25       1.1      scw  *
     26       1.1      scw  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27       1.1      scw  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28       1.1      scw  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29       1.1      scw  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30       1.1      scw  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31       1.1      scw  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32       1.1      scw  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33       1.1      scw  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34       1.1      scw  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35       1.1      scw  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36       1.1      scw  * POSSIBILITY OF SUCH DAMAGE.
     37       1.1      scw  */
     38       1.1      scw 
     39       1.1      scw #include <sys/param.h>
     40       1.1      scw #include <sys/systm.h>
     41       1.1      scw #include <sys/kernel.h>
     42       1.1      scw #include <sys/device.h>
     43       1.1      scw #include <sys/lock.h>
     44       1.1      scw 
     45       1.1      scw #include <machine/bus.h>
     46       1.1      scw 
     47       1.1      scw #include <dev/i2c/i2cvar.h>
     48       1.1      scw #include <dev/i2c/i2c_bitbang.h>
     49       1.1      scw 
     50       1.1      scw #include <arm/xscale/ixp425reg.h>
     51       1.1      scw #include <arm/xscale/ixp425var.h>
     52       1.1      scw 
     53       1.1      scw #include <evbarm/nslu2/nslu2reg.h>
     54       1.1      scw 
     55       1.1      scw struct slugiic_softc {
     56       1.1      scw 	struct device sc_dev;
     57       1.1      scw 	struct i2c_controller sc_ic;
     58       1.1      scw 	struct i2c_bitbang_ops sc_ibo;
     59       1.1      scw 	struct lock sc_lock;
     60       1.1      scw 	uint32_t sc_dirout;
     61       1.1      scw };
     62       1.1      scw 
     63       1.1      scw static int
     64       1.1      scw slugiic_acquire_bus(void *arg, int flags)
     65       1.1      scw {
     66       1.1      scw 	struct slugiic_softc *sc = arg;
     67       1.1      scw 
     68       1.1      scw 	if (flags & I2C_F_POLL)
     69       1.1      scw 		return (0);
     70       1.1      scw 
     71       1.1      scw 	return (lockmgr(&sc->sc_lock, LK_EXCLUSIVE, NULL));
     72       1.1      scw }
     73       1.1      scw 
     74       1.1      scw static void
     75       1.1      scw slugiic_release_bus(void *arg, int flags)
     76       1.1      scw {
     77       1.1      scw 	struct slugiic_softc *sc = arg;
     78       1.1      scw 
     79       1.1      scw 	if (flags & I2C_F_POLL)
     80       1.1      scw 		return;
     81       1.1      scw 
     82       1.1      scw 	(void) lockmgr(&sc->sc_lock, LK_RELEASE, NULL);
     83       1.1      scw }
     84       1.1      scw 
     85       1.1      scw static int
     86       1.1      scw slugiic_send_start(void *arg, int flags)
     87       1.1      scw {
     88       1.1      scw 	struct slugiic_softc *sc = arg;
     89       1.1      scw 
     90       1.1      scw 	return (i2c_bitbang_send_start(sc, flags, &sc->sc_ibo));
     91       1.1      scw }
     92       1.1      scw 
     93       1.1      scw static int
     94       1.1      scw slugiic_send_stop(void *arg, int flags)
     95       1.1      scw {
     96       1.1      scw 	struct slugiic_softc *sc = arg;
     97       1.1      scw 
     98       1.1      scw 	return (i2c_bitbang_send_stop(sc, flags, &sc->sc_ibo));
     99       1.1      scw }
    100       1.1      scw 
    101       1.1      scw static int
    102       1.1      scw slugiic_initiate_xfer(void *arg, i2c_addr_t addr, int flags)
    103       1.1      scw {
    104       1.1      scw 	struct slugiic_softc *sc = arg;
    105       1.1      scw 
    106       1.1      scw 	return (i2c_bitbang_initiate_xfer(sc, addr, flags, &sc->sc_ibo));
    107       1.1      scw }
    108       1.1      scw 
    109       1.1      scw static int
    110       1.1      scw slugiic_read_byte(void *arg, uint8_t *vp, int flags)
    111       1.1      scw {
    112       1.1      scw 	struct slugiic_softc *sc = arg;
    113       1.1      scw 
    114       1.1      scw 	return (i2c_bitbang_read_byte(sc, vp, flags, &sc->sc_ibo));
    115       1.1      scw }
    116       1.1      scw 
    117       1.1      scw static int
    118       1.1      scw slugiic_write_byte(void *arg, uint8_t v, int flags)
    119       1.1      scw {
    120       1.1      scw 	struct slugiic_softc *sc = arg;
    121       1.1      scw 
    122       1.1      scw 	return (i2c_bitbang_write_byte(sc, v, flags, &sc->sc_ibo));
    123       1.1      scw }
    124       1.1      scw 
    125       1.1      scw static void
    126       1.1      scw slugiic_set_dir(void *arg, uint32_t bits)
    127       1.1      scw {
    128       1.1      scw 	struct slugiic_softc *sc = arg;
    129       1.1      scw 	uint32_t reg;
    130       1.1      scw 	int s;
    131       1.1      scw 
    132       1.1      scw 	if (sc->sc_dirout == (bits ^ GPIO_I2C_SDA_BIT))
    133       1.1      scw 		return;
    134       1.1      scw 
    135       1.1      scw 	s = splhigh();
    136       1.1      scw 
    137       1.1      scw 	sc->sc_dirout = bits ^ GPIO_I2C_SDA_BIT;
    138       1.1      scw 
    139       1.1      scw 	reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOER);
    140       1.1      scw 	reg &= ~GPIO_I2C_SDA_BIT;
    141       1.1      scw 	GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOER, reg | bits);
    142       1.1      scw 
    143       1.1      scw 	splx(s);
    144       1.1      scw }
    145       1.1      scw 
    146       1.1      scw static void
    147       1.1      scw slugiic_set_bits(void *arg, uint32_t bits)
    148       1.1      scw {
    149       1.1      scw 	struct slugiic_softc *sc = arg;
    150       1.1      scw 	uint32_t reg;
    151       1.1      scw 	int s;
    152       1.1      scw 
    153       1.1      scw 	if (sc->sc_dirout == 0 && !(bits & GPIO_I2C_SDA_BIT))
    154       1.1      scw 		bits |= GPIO_I2C_SDA_BIT;
    155       1.1      scw 
    156       1.1      scw 	s = splhigh();
    157       1.1      scw 
    158       1.1      scw 	reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOUTR);
    159       1.1      scw 	reg &= ~(GPIO_I2C_SDA_BIT | GPIO_I2C_SCL_BIT);
    160       1.1      scw 	GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOUTR, reg | bits);
    161       1.1      scw 
    162       1.1      scw 	splx(s);
    163       1.1      scw }
    164       1.1      scw 
    165       1.1      scw static uint32_t
    166       1.1      scw slugiic_read_bits(void *arg)
    167       1.1      scw {
    168       1.1      scw 	uint32_t reg;
    169       1.1      scw 
    170       1.1      scw 	reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPINR);
    171       1.1      scw 	return (reg & (GPIO_I2C_SDA_BIT | GPIO_I2C_SCL_BIT));
    172       1.1      scw }
    173       1.1      scw 
    174       1.1      scw static void
    175       1.1      scw slugiic_deferred_attach(struct device *device)
    176       1.1      scw {
    177       1.1      scw 	struct slugiic_softc *sc = (struct slugiic_softc *)device;
    178       1.1      scw 	struct i2cbus_attach_args iba;
    179       1.1      scw 	uint32_t reg;
    180       1.1      scw 
    181       1.1      scw 	reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOUTR);
    182       1.1      scw 	reg |= GPIO_I2C_SDA_BIT | GPIO_I2C_SCL_BIT;
    183       1.1      scw 	GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOUTR, reg);
    184       1.1      scw 
    185       1.1      scw 	reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOER);
    186       1.1      scw 	reg &= ~GPIO_I2C_SCL_BIT;
    187       1.1      scw 	reg |= GPIO_I2C_SDA_BIT;
    188       1.1      scw 	GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOER, reg);
    189       1.1      scw 
    190       1.1      scw 	iba.iba_tag = &sc->sc_ic;
    191  1.1.14.1  gdamore 	(void) config_found_ia(&sc->sc_dev, "i2cbus", &iba, iicbus_print);
    192       1.1      scw }
    193       1.1      scw 
    194       1.1      scw static int
    195       1.1      scw slugiic_match(struct device *parent, struct cfdata *cf, void *arg)
    196       1.1      scw {
    197       1.1      scw 
    198       1.1      scw 	return (1);
    199       1.1      scw }
    200       1.1      scw 
    201       1.1      scw static void
    202       1.1      scw slugiic_attach(struct device *parent, struct device *self, void *arg)
    203       1.1      scw {
    204       1.1      scw 	struct slugiic_softc *sc = (struct slugiic_softc *)self;
    205       1.1      scw 
    206       1.1      scw 	aprint_naive("\n");
    207       1.1      scw 	aprint_normal(": I2C bus\n");
    208       1.1      scw 
    209       1.1      scw 	sc->sc_ic.ic_cookie = sc;
    210       1.1      scw 	sc->sc_ic.ic_acquire_bus = slugiic_acquire_bus;
    211       1.1      scw 	sc->sc_ic.ic_release_bus = slugiic_release_bus;
    212       1.1      scw 	sc->sc_ic.ic_exec = NULL;
    213       1.1      scw 	sc->sc_ic.ic_send_start = slugiic_send_start;
    214       1.1      scw 	sc->sc_ic.ic_send_stop = slugiic_send_stop;
    215       1.1      scw 	sc->sc_ic.ic_initiate_xfer = slugiic_initiate_xfer;
    216       1.1      scw 	sc->sc_ic.ic_read_byte = slugiic_read_byte;
    217       1.1      scw 	sc->sc_ic.ic_write_byte = slugiic_write_byte;
    218       1.1      scw 
    219       1.1      scw 	sc->sc_ibo.ibo_set_dir = slugiic_set_dir;
    220       1.1      scw 	sc->sc_ibo.ibo_set_bits = slugiic_set_bits;
    221       1.1      scw 	sc->sc_ibo.ibo_read_bits = slugiic_read_bits;
    222       1.1      scw 	sc->sc_ibo.ibo_bits[I2C_BIT_SDA] = GPIO_I2C_SDA_BIT;
    223       1.1      scw 	sc->sc_ibo.ibo_bits[I2C_BIT_SCL] = GPIO_I2C_SCL_BIT;
    224       1.1      scw 	sc->sc_ibo.ibo_bits[I2C_BIT_OUTPUT] = 0;
    225       1.1      scw 	sc->sc_ibo.ibo_bits[I2C_BIT_INPUT] = GPIO_I2C_SDA_BIT;
    226       1.1      scw 
    227       1.1      scw 	lockinit(&sc->sc_lock, PRIBIO|PCATCH, "slugiiclk", 0, 0);
    228       1.1      scw 
    229       1.1      scw 	sc->sc_dirout = 0;
    230       1.1      scw 
    231       1.1      scw 	/*
    232       1.1      scw 	 * Defer until ixp425_softc has been initialised
    233       1.1      scw 	 */
    234       1.1      scw 	config_interrupts(self, slugiic_deferred_attach);
    235       1.1      scw }
    236       1.1      scw 
    237       1.1      scw CFATTACH_DECL(slugiic, sizeof(struct slugiic_softc),
    238       1.1      scw     slugiic_match, slugiic_attach, NULL, NULL);
    239