238 lines
6.2 KiB
C
238 lines
6.2 KiB
C
/* $NetBSD: iomdiic.c,v 1.7 2012/05/14 10:38:08 skrll Exp $ */
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/*
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* Copyright (c) 2003 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/mutex.h>
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#include <sys/bus.h>
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#include <sys/cpu.h>
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#include <arm/iomd/iomdreg.h>
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#include <arm/iomd/iomdvar.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/i2c/i2c_bitbang.h>
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#include <arm/iomd/iomdiicvar.h>
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struct iomdiic_softc {
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device_t sc_dev;
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bus_space_tag_t sc_st;
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bus_space_handle_t sc_sh;
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struct i2c_controller sc_i2c;
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kmutex_t sc_buslock;
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/*
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* The SDA pin is open-drain, so we make it an input by
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* writing a 1 to it.
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*/
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uint8_t sc_iomd_iocr;
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};
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static int iomdiic_acquire_bus(void *, int);
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static void iomdiic_release_bus(void *, int);
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static int iomdiic_send_start(void *, int);
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static int iomdiic_send_stop(void *, int);
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static int iomdiic_initiate_xfer(void *, i2c_addr_t, int);
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static int iomdiic_read_byte(void *, uint8_t *, int);
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static int iomdiic_write_byte(void *, uint8_t, int);
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#define IOMDIIC_READ *(volatile uint8_t *)(IOMD_ADDRESS(IOMD_IOCR))
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#define IOMDIIC_WRITE(x) *(volatile uint8_t *)(IOMD_ADDRESS(IOMD_IOCR)) = (x)
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#define IOMD_IOCR_SDA 0x01
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#define IOMD_IOCR_SCL 0x02
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static void
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iomdiic_bb_set_bits(void *cookie, uint32_t bits)
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{
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struct iomdiic_softc *sc = cookie;
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IOMDIIC_WRITE((IOMDIIC_READ & ~(IOMD_IOCR_SDA|IOMD_IOCR_SCL)) |
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sc->sc_iomd_iocr | bits);
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}
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static void
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iomdiic_bb_set_dir(void *cookie, uint32_t bits)
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{
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struct iomdiic_softc *sc = cookie;
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sc->sc_iomd_iocr = bits;
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}
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static uint32_t
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iomdiic_bb_read_bits(void *cookie)
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{
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return (IOMDIIC_READ);
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}
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static const struct i2c_bitbang_ops iomdiic_bbops = {
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iomdiic_bb_set_bits,
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iomdiic_bb_set_dir,
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iomdiic_bb_read_bits,
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{
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IOMD_IOCR_SDA, /* SDA */
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IOMD_IOCR_SCL, /* SCL */
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0, /* SDA is output */
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IOMD_IOCR_SDA, /* SDA is input */
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}
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};
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static int
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iomdiic_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct iic_attach_args *ia = aux;
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if (strcmp(ia->ia_name, "iic") == 0) return 1;
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return 0;
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}
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static void
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iomdiic_attach(device_t parent, device_t self, void *aux)
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{
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struct iomdiic_softc *sc = device_private(self);
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struct i2cbus_attach_args iba;
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aprint_normal("\n");
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sc->sc_dev = self;
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mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE);
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sc->sc_i2c.ic_cookie = sc;
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sc->sc_i2c.ic_acquire_bus = iomdiic_acquire_bus;
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sc->sc_i2c.ic_release_bus = iomdiic_release_bus;
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sc->sc_i2c.ic_send_start = iomdiic_send_start;
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sc->sc_i2c.ic_send_stop = iomdiic_send_stop;
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sc->sc_i2c.ic_initiate_xfer = iomdiic_initiate_xfer;
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sc->sc_i2c.ic_read_byte = iomdiic_read_byte;
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sc->sc_i2c.ic_write_byte = iomdiic_write_byte;
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iba.iba_tag = &sc->sc_i2c;
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(void) config_found_ia(sc->sc_dev, "i2cbus", &iba, iicbus_print);
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}
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CFATTACH_DECL_NEW(iomdiic, sizeof(struct iomdiic_softc),
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iomdiic_match, iomdiic_attach, NULL, NULL);
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i2c_tag_t
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iomdiic_bootstrap_cookie(void)
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{
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static struct iomdiic_softc sc;
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static struct device dev;
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/* XXX Yuck. */
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strcpy(dev.dv_xname, "iomdiicboot");
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sc.sc_dev = &dev;
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sc.sc_i2c.ic_cookie = ≻
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sc.sc_i2c.ic_acquire_bus = iomdiic_acquire_bus;
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sc.sc_i2c.ic_release_bus = iomdiic_release_bus;
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sc.sc_i2c.ic_send_start = iomdiic_send_start;
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sc.sc_i2c.ic_send_stop = iomdiic_send_stop;
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sc.sc_i2c.ic_initiate_xfer = iomdiic_initiate_xfer;
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sc.sc_i2c.ic_read_byte = iomdiic_read_byte;
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sc.sc_i2c.ic_write_byte = iomdiic_write_byte;
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return ((void *) &sc.sc_i2c);
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}
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static int
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iomdiic_acquire_bus(void *cookie, int flags)
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{
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struct iomdiic_softc *sc = cookie;
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/* XXX What should we do for the polling case? */
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if (flags & I2C_F_POLL)
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return (0);
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mutex_enter(&sc->sc_buslock);
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return (0);
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}
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static void
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iomdiic_release_bus(void *cookie, int flags)
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{
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struct iomdiic_softc *sc = cookie;
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/* XXX See above. */
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if (flags & I2C_F_POLL)
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return;
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mutex_exit(&sc->sc_buslock);
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}
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static int
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iomdiic_send_start(void *cookie, int flags)
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{
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return (i2c_bitbang_send_start(cookie, flags, &iomdiic_bbops));
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}
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static int
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iomdiic_send_stop(void *cookie, int flags)
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{
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return (i2c_bitbang_send_stop(cookie, flags, &iomdiic_bbops));
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}
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static int
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iomdiic_initiate_xfer(void *cookie, i2c_addr_t addr, int flags)
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{
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return (i2c_bitbang_initiate_xfer(cookie, addr, flags, &iomdiic_bbops));
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}
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static int
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iomdiic_read_byte(void *cookie, uint8_t *bytep, int flags)
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{
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return (i2c_bitbang_read_byte(cookie, bytep, flags, &iomdiic_bbops));
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}
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static int
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iomdiic_write_byte(void *cookie, uint8_t byte, int flags)
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{
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return (i2c_bitbang_write_byte(cookie, byte, flags, &iomdiic_bbops));
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}
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