mpcsa_spi.c revision 1.2
1 1.2 matt /* $Id: mpcsa_spi.c,v 1.2 2008/07/03 01:15:39 matt Exp $ */ 2 1.2 matt /* $NetBSD: mpcsa_spi.c,v 1.2 2008/07/03 01:15:39 matt Exp $ */ 3 1.2 matt 4 1.2 matt /* 5 1.2 matt * Copyright (c) 2007 Embedtronics Oy. All rights reserved. 6 1.2 matt * 7 1.2 matt * Redistribution and use in source and binary forms, with or without 8 1.2 matt * modification, are permitted provided that the following conditions 9 1.2 matt * are met: 10 1.2 matt * 1. Redistributions of source code must retain the above copyright 11 1.2 matt * notice, this list of conditions and the following disclaimer. 12 1.2 matt * 2. Redistributions in binary form must reproduce the above copyright 13 1.2 matt * notice, this list of conditions and the following disclaimer in the 14 1.2 matt * documentation and/or other materials provided with the distribution. 15 1.2 matt * 16 1.2 matt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 1.2 matt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 1.2 matt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 1.2 matt * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 1.2 matt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 1.2 matt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 1.2 matt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 1.2 matt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 1.2 matt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.2 matt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.2 matt * SUCH DAMAGE. 27 1.2 matt */ 28 1.2 matt 29 1.2 matt #include <sys/cdefs.h> 30 1.2 matt __KERNEL_RCSID(0, "$NetBSD: mpcsa_spi.c,v 1.2 2008/07/03 01:15:39 matt Exp $"); 31 1.2 matt 32 1.2 matt #include <sys/param.h> 33 1.2 matt #include <sys/systm.h> 34 1.2 matt #include <sys/kernel.h> 35 1.2 matt #include <sys/device.h> 36 1.2 matt #include <sys/lock.h> 37 1.2 matt #include <arm/at91/at91reg.h> 38 1.2 matt #include <arm/at91/at91var.h> 39 1.2 matt #include <arm/at91/at91spivar.h> 40 1.2 matt #include <arm/at91/at91piovar.h> 41 1.2 matt 42 1.2 matt #ifdef MPCSA_SPI_DEBUG 43 1.2 matt int mpcsa_spi_debug = MPCSA_SPI_DEBUG; 44 1.2 matt #define DPRINTFN(n,x) if (mpcsa_spi_debug>(n)) printf x; 45 1.2 matt #else 46 1.2 matt #define DPRINTFN(n,x) 47 1.2 matt #endif 48 1.2 matt 49 1.2 matt struct at91pio_softc; 50 1.2 matt 51 1.2 matt struct mpcsa_spi_softc { 52 1.2 matt struct at91spi_softc sc_dev; 53 1.2 matt struct at91pio_softc *sc_pioa, *sc_piod; 54 1.2 matt }; 55 1.2 matt 56 1.2 matt static int mpcsa_spi_match(struct device *, struct cfdata *, void *); 57 1.2 matt static void mpcsa_spi_attach(struct device *, struct device *, void *); 58 1.2 matt 59 1.2 matt CFATTACH_DECL(mpcsa_spi, sizeof(struct mpcsa_spi_softc), 60 1.2 matt mpcsa_spi_match, mpcsa_spi_attach, NULL, NULL); 61 1.2 matt 62 1.2 matt static int mpcsa_spi_select(void *self, int sel); 63 1.2 matt 64 1.2 matt struct at91spi_machdep mpcsa_spi_tag = { 65 1.2 matt mpcsa_spi_select 66 1.2 matt }; 67 1.2 matt 68 1.2 matt static int 69 1.2 matt mpcsa_spi_match(struct device *parent, struct cfdata *match, void *aux) 70 1.2 matt { 71 1.2 matt if (strcmp(match->cf_name, "at91spi") == 0 && strcmp(match->cf_atname, "mpcsa_spi") == 0) 72 1.2 matt return 2; 73 1.2 matt return 0; 74 1.2 matt } 75 1.2 matt 76 1.2 matt #define GPIO_SPICS0(func) (func)(sc->sc_pioa, 3) 77 1.2 matt #define GPIO_SPICS1(func) (func)(sc->sc_pioa, 4) 78 1.2 matt #define GPIO_SPICS2(func) (func)(sc->sc_piod, 19) 79 1.2 matt 80 1.2 matt 81 1.2 matt static void 82 1.2 matt mpcsa_spi_attach(struct device *parent, struct device *self, void *aux) 83 1.2 matt { 84 1.2 matt struct mpcsa_spi_softc *sc = (struct mpcsa_spi_softc *)self; 85 1.2 matt 86 1.2 matt // do some checks 87 1.2 matt if ((sc->sc_pioa = at91pio_sc(AT91_PIOA)) == NULL) { 88 1.2 matt printf("no PIOA!\n"); 89 1.2 matt return; 90 1.2 matt } 91 1.2 matt if ((sc->sc_piod = at91pio_sc(AT91_PIOD)) == NULL) { 92 1.2 matt printf("no PIOD!\n"); 93 1.2 matt return; 94 1.2 matt } 95 1.2 matt 96 1.2 matt // initialize softc 97 1.2 matt sc->sc_dev.sc_spi.sct_nslaves = 3; // number of slaves 98 1.2 matt 99 1.2 matt // configure GPIO 100 1.2 matt GPIO_SPICS0(at91pio_out); GPIO_SPICS0(at91pio_set); 101 1.2 matt GPIO_SPICS1(at91pio_out); GPIO_SPICS1(at91pio_set); 102 1.2 matt GPIO_SPICS2(at91pio_out); GPIO_SPICS2(at91pio_set); 103 1.2 matt 104 1.2 matt // and call common routine 105 1.2 matt at91spi_attach_common(parent, self, aux, &mpcsa_spi_tag); 106 1.2 matt } 107 1.2 matt 108 1.2 matt static int mpcsa_spi_select(void *self, int sel) 109 1.2 matt { 110 1.2 matt struct mpcsa_spi_softc *sc = (struct mpcsa_spi_softc *)self; 111 1.2 matt 112 1.2 matt /* first deselect everything */ 113 1.2 matt GPIO_SPICS0(at91pio_set); 114 1.2 matt GPIO_SPICS1(at91pio_set); 115 1.2 matt GPIO_SPICS2(at91pio_set); 116 1.2 matt 117 1.2 matt /* then select wanted target */ 118 1.2 matt switch (sel) { 119 1.2 matt case -1: 120 1.2 matt break; 121 1.2 matt case 0: 122 1.2 matt GPIO_SPICS0(at91pio_clear); 123 1.2 matt break; 124 1.2 matt case 1: 125 1.2 matt GPIO_SPICS2(at91pio_clear); 126 1.2 matt break; 127 1.2 matt case 2: 128 1.2 matt GPIO_SPICS2(at91pio_clear); 129 1.2 matt break; 130 1.2 matt default: 131 1.2 matt return EINVAL; 132 1.2 matt } 133 1.2 matt 134 1.2 matt return 0; 135 1.2 matt } 136
Indexes created Tue Oct 21 12:09:54 GMT 2025