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