1 /* $NetBSD: j720ssp.c,v 1.34 2021/08/07 16:18:53 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2001, 2006 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by IWAMOTO Toshihiro.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /* Jornada 720 SSP port. */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: j720ssp.c,v 1.34 2021/08/07 16:18:53 thorpej Exp $");
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/device.h>
40
41 #include <arm/sa11x0/sa11x0_var.h>
42 #include <arm/sa11x0/sa11x0_gpioreg.h>
43 #include <arm/sa11x0/sa11x0_ppcreg.h>
44 #include <arm/sa11x0/sa11x0_sspreg.h>
45
46 #include <hpcarm/dev/j720sspvar.h>
47
48 #ifdef DEBUG
49 #define DPRINTF(arg) aprint_normal arg
50 #else
51 #define DPRINTF(arg) /* nothing */
52 #endif
53
54 #define BIT_INVERT(x) \
55 do { \
56 (x) = ((((x) & 0xf0) >> 4) | (((x) & 0x0f) << 4)); \
57 (x) = ((((x) & 0xcc) >> 2) | (((x) & 0x33) << 2)); \
58 (x) = ((((x) & 0xaa) >> 1) | (((x) & 0x55) << 1)); \
59 } while (0)
60
61 static int j720ssp_match(device_t, cfdata_t, void *);
62 static void j720ssp_attach(device_t, device_t, void *);
63 static int j720ssp_search(device_t, cfdata_t, const int *, void *);
64 static int j720ssp_print(void *, const char *);
65
66 CFATTACH_DECL_NEW(j720ssp, sizeof(struct j720ssp_softc),
67 j720ssp_match, j720ssp_attach, NULL, NULL);
68
69
70 static int
j720ssp_match(device_t parent,cfdata_t cf,void * aux)71 j720ssp_match(device_t parent, cfdata_t cf, void *aux)
72 {
73
74 if (strcmp(cf->cf_name, "j720ssp") != 0)
75 return 0;
76
77 return 1;
78 }
79
80 static void
j720ssp_attach(device_t parent,device_t self,void * aux)81 j720ssp_attach(device_t parent, device_t self, void *aux)
82 {
83 struct j720ssp_softc *sc = device_private(self);
84 struct sa11x0_softc *psc = device_private(parent);
85 struct sa11x0_attach_args *sa = aux;
86
87 sc->sc_dev = self;
88 sc->sc_iot = psc->sc_iot;
89 sc->sc_gpioh = psc->sc_gpioh;
90 sc->sc_parent = psc;
91
92 if (bus_space_map(sc->sc_iot, sa->sa_addr, sa->sa_size, 0,
93 &sc->sc_ssph)) {
94 aprint_normal(": unable to map SSP registers\n");
95 return;
96 }
97
98 aprint_normal("\n");
99
100 config_search(self, NULL,
101 CFARGS(.search = j720ssp_search));
102 }
103
104 static int
j720ssp_search(device_t parent,cfdata_t cf,const int * ldesc,void * aux)105 j720ssp_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
106 {
107
108 if (config_probe(parent, cf, NULL))
109 config_attach(parent, cf, NULL, j720ssp_print, CFARGS_NONE);
110
111 return 0;
112 }
113
114 static int
j720ssp_print(void * aux,const char * pnp)115 j720ssp_print(void *aux, const char *pnp)
116 {
117
118 return pnp ? QUIET : UNCONF;
119 }
120
121 int
j720ssp_readwrite(struct j720ssp_softc * sc,int drainfifo,int in,int * out,int wait)122 j720ssp_readwrite(struct j720ssp_softc *sc, int drainfifo, int in,
123 int *out, int wait)
124 {
125 int timeout;
126
127 while (!(bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & SR_TNF))
128 continue;
129
130 timeout = 400000;
131 while (bus_space_read_4(sc->sc_iot, sc->sc_gpioh, SAGPIO_PLR) & 0x400)
132 if (--timeout == 0) {
133 DPRINTF(("j720ssp_readwrite: timeout 0\n"));
134 return -1;
135 }
136 if (drainfifo) {
137 while (bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) &
138 SR_RNE)
139 bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_DR);
140 delay(wait);
141 }
142
143 BIT_INVERT(in);
144 bus_space_write_4(sc->sc_iot, sc->sc_ssph, SASSP_DR, in << 8);
145
146 delay(wait);
147 timeout = 100000;
148 while (!(bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & SR_RNE))
149 if (--timeout == 0) {
150 DPRINTF(("j720ssp_readwrite: timeout 1\n"));
151 return -1;
152 }
153
154 *out = bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_DR);
155 BIT_INVERT(*out);
156
157 return 0;
158 }
159