136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/* $Id: mpcsa_spi.c,v 1.2 2008/07/03 01:15:39 matt Exp $ */
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/* $NetBSD: mpcsa_spi.c,v 1.2 2008/07/03 01:15:39 matt Exp $ */
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/*
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* Copyright (c) 2007 Embedtronics Oy. All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: mpcsa_spi.c,v 1.2 2008/07/03 01:15:39 matt Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/lock.h>
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#include <arm/at91/at91reg.h>
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#include <arm/at91/at91var.h>
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#include <arm/at91/at91spivar.h>
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#include <arm/at91/at91piovar.h>
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#ifdef MPCSA_SPI_DEBUG
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int mpcsa_spi_debug = MPCSA_SPI_DEBUG;
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#define DPRINTFN(n,x) if (mpcsa_spi_debug>(n)) printf x;
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#else
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#define DPRINTFN(n,x)
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#endif
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struct at91pio_softc;
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struct mpcsa_spi_softc {
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struct at91spi_softc sc_dev;
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struct at91pio_softc *sc_pioa, *sc_piod;
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};
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static int mpcsa_spi_match(struct device *, struct cfdata *, void *);
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static void mpcsa_spi_attach(struct device *, struct device *, void *);
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CFATTACH_DECL(mpcsa_spi, sizeof(struct mpcsa_spi_softc),
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mpcsa_spi_match, mpcsa_spi_attach, NULL, NULL);
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static int mpcsa_spi_select(void *self, int sel);
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struct at91spi_machdep mpcsa_spi_tag = {
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mpcsa_spi_select
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};
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static int
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mpcsa_spi_match(struct device *parent, struct cfdata *match, void *aux)
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{
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if (strcmp(match->cf_name, "at91spi") == 0 && strcmp(match->cf_atname, "mpcsa_spi") == 0)
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return 2;
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return 0;
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}
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#define GPIO_SPICS0(func) (func)(sc->sc_pioa, 3)
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#define GPIO_SPICS1(func) (func)(sc->sc_pioa, 4)
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#define GPIO_SPICS2(func) (func)(sc->sc_piod, 19)
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static void
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mpcsa_spi_attach(struct device *parent, struct device *self, void *aux)
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{
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struct mpcsa_spi_softc *sc = (struct mpcsa_spi_softc *)self;
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// do some checks
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if ((sc->sc_pioa = at91pio_sc(AT91_PIOA)) == NULL) {
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printf("no PIOA!\n");
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return;
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}
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if ((sc->sc_piod = at91pio_sc(AT91_PIOD)) == NULL) {
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printf("no PIOD!\n");
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return;
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}
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// initialize softc
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sc->sc_dev.sc_spi.sct_nslaves = 3; // number of slaves
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// configure GPIO
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GPIO_SPICS0(at91pio_out); GPIO_SPICS0(at91pio_set);
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GPIO_SPICS1(at91pio_out); GPIO_SPICS1(at91pio_set);
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GPIO_SPICS2(at91pio_out); GPIO_SPICS2(at91pio_set);
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// and call common routine
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at91spi_attach_common(parent, self, aux, &mpcsa_spi_tag);
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}
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static int mpcsa_spi_select(void *self, int sel)
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{
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struct mpcsa_spi_softc *sc = (struct mpcsa_spi_softc *)self;
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/* first deselect everything */
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GPIO_SPICS0(at91pio_set);
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GPIO_SPICS1(at91pio_set);
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GPIO_SPICS2(at91pio_set);
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/* then select wanted target */
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switch (sel) {
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case -1:
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break;
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case 0:
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GPIO_SPICS0(at91pio_clear);
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break;
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case 1:
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GPIO_SPICS2(at91pio_clear);
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break;
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case 2:
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GPIO_SPICS2(at91pio_clear);
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break;
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default:
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return EINVAL;
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}
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return 0;
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}
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