1 /* $NetBSD: armadillo9_iic.c,v 1.11 2021/08/07 16:18:49 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 2005 HAMAJIMA Katsuomi. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: armadillo9_iic.c,v 1.11 2021/08/07 16:18:49 thorpej Exp $");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/device.h>
35 #include <sys/mutex.h>
36 #include <dev/i2c/i2cvar.h>
37 #include <dev/i2c/i2c_bitbang.h>
38 #include <arm/ep93xx/epsocvar.h>
39 #include <arm/ep93xx/epgpiovar.h>
40 #include <evbarm/armadillo/armadillo9var.h>
41
42 #include "seeprom.h"
43 #if NSEEPROM > 0
44 #include <net/if.h>
45 #include <net/if_ether.h>
46 #include <dev/i2c/at24cxxvar.h>
47 #endif
48
49 struct armadillo9iic_softc {
50 struct i2c_controller sc_i2c;
51 int sc_port;
52 int sc_sda;
53 int sc_scl;
54 struct epgpio_softc *sc_gpio;
55 };
56
57 static int armadillo9iic_match(device_t, cfdata_t, void *);
58 static void armadillo9iic_attach(device_t, device_t, void *);
59
60 static int armadillo9iic_send_start(void *, int);
61 static int armadillo9iic_send_stop(void *, int);
62 static int armadillo9iic_initiate_xfer(void *, uint16_t, int);
63 static int armadillo9iic_read_byte(void *, uint8_t *, int);
64 static int armadillo9iic_write_byte(void *, uint8_t, int);
65
66 static void armadillo9iic_bb_set_bits(void *, uint32_t);
67 static void armadillo9iic_bb_set_dir(void *, uint32_t);
68 static uint32_t armadillo9iic_bb_read_bits(void *);
69
70 CFATTACH_DECL_NEW(armadillo9iic, sizeof(struct armadillo9iic_softc),
71 armadillo9iic_match, armadillo9iic_attach, NULL, NULL);
72
73 static struct i2c_bitbang_ops armadillo9iic_bbops = {
74 armadillo9iic_bb_set_bits,
75 armadillo9iic_bb_set_dir,
76 armadillo9iic_bb_read_bits,
77 { 0, 0, 0, 0 } /* set in attach() */
78 };
79
80 int
armadillo9iic_match(device_t parent,cfdata_t cf,void * aux)81 armadillo9iic_match(device_t parent, cfdata_t cf, void *aux)
82 {
83 return 2;
84 }
85
86 void
armadillo9iic_attach(device_t parent,device_t self,void * aux)87 armadillo9iic_attach(device_t parent, device_t self, void *aux)
88 {
89 struct armadillo9iic_softc *sc = device_private(self);
90 struct i2cbus_attach_args iba;
91 #if NSEEPROM > 0
92 struct epgpio_attach_args *ga = aux;
93 #endif
94
95 sc->sc_port = ga->ga_port;
96 sc->sc_sda = ga->ga_bit1;
97 sc->sc_scl = ga->ga_bit2;
98 sc->sc_gpio = (struct epgpio_softc *)parent;
99
100 armadillo9iic_bbops.ibo_bits[I2C_BIT_SDA] = (1<<sc->sc_sda);
101 armadillo9iic_bbops.ibo_bits[I2C_BIT_SCL] = (1<<sc->sc_scl);
102 armadillo9iic_bbops.ibo_bits[I2C_BIT_OUTPUT] = sc->sc_sda;
103 armadillo9iic_bbops.ibo_bits[I2C_BIT_INPUT] = 0;
104
105 iic_tag_init(&sc->sc_i2c);
106 sc->sc_i2c.ic_cookie = sc;
107 sc->sc_i2c.ic_send_start = armadillo9iic_send_start;
108 sc->sc_i2c.ic_send_stop = armadillo9iic_send_stop;
109 sc->sc_i2c.ic_initiate_xfer = armadillo9iic_initiate_xfer;
110 sc->sc_i2c.ic_read_byte = armadillo9iic_read_byte;
111 sc->sc_i2c.ic_write_byte = armadillo9iic_write_byte;
112
113 memset(&iba, 0, sizeof(iba));
114 iba.iba_tag = &sc->sc_i2c;
115
116 epgpio_in(sc->sc_gpio, sc->sc_port, sc->sc_sda);
117 epgpio_out(sc->sc_gpio, sc->sc_port, sc->sc_scl);
118 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_scl);
119
120 printf("\n");
121
122 config_found(self, &iba, iicbus_print, CFARGS_NONE);
123
124 #if NSEEPROM > 0
125 /* read mac address */
126 /* XXX This should probably be done elsewhere, earlier in bootstrap. */
127 if (seeprom_bootstrap_read(&sc->sc_i2c, 0x50, 0x00, 128,
128 armadillo9_ethaddr, ETHER_ADDR_LEN) != 0) {
129 printf("%s: WARNING: unable to read MAC address from SEEPROM\n",
130 device_xname(self));
131 }
132 #endif
133 }
134
135 int
armadillo9iic_send_start(void * cookie,int flags)136 armadillo9iic_send_start(void *cookie, int flags)
137 {
138 return i2c_bitbang_send_start(cookie, flags, &armadillo9iic_bbops);
139 }
140
141 int
armadillo9iic_send_stop(void * cookie,int flags)142 armadillo9iic_send_stop(void *cookie, int flags)
143 {
144 return i2c_bitbang_send_stop(cookie, flags, &armadillo9iic_bbops);
145 }
146
147 int
armadillo9iic_initiate_xfer(void * cookie,i2c_addr_t addr,int flags)148 armadillo9iic_initiate_xfer(void *cookie, i2c_addr_t addr, int flags)
149 {
150 return i2c_bitbang_initiate_xfer(cookie, addr, flags,
151 &armadillo9iic_bbops);
152 }
153
154 int
armadillo9iic_read_byte(void * cookie,uint8_t * bytep,int flags)155 armadillo9iic_read_byte(void *cookie, uint8_t *bytep, int flags)
156 {
157 return i2c_bitbang_read_byte(cookie, bytep, flags,
158 &armadillo9iic_bbops);
159 }
160
161 int
armadillo9iic_write_byte(void * cookie,uint8_t byte,int flags)162 armadillo9iic_write_byte(void *cookie, uint8_t byte, int flags)
163 {
164 return i2c_bitbang_write_byte(cookie, byte, flags,
165 &armadillo9iic_bbops);
166 }
167
168 void
armadillo9iic_bb_set_bits(void * cookie,uint32_t bits)169 armadillo9iic_bb_set_bits(void *cookie, uint32_t bits)
170 {
171 struct armadillo9iic_softc *sc = cookie;
172
173 if (bits & (1 << sc->sc_sda))
174 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_sda);
175 else
176 epgpio_clear(sc->sc_gpio, sc->sc_port, sc->sc_sda);
177
178 if (bits & (1 << sc->sc_scl))
179 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_scl);
180 else
181 epgpio_clear(sc->sc_gpio, sc->sc_port, sc->sc_scl);
182 }
183
184 void
armadillo9iic_bb_set_dir(void * cookie,uint32_t bits)185 armadillo9iic_bb_set_dir(void *cookie, uint32_t bits)
186 {
187 struct armadillo9iic_softc *sc = cookie;
188
189 if(bits)
190 epgpio_out(sc->sc_gpio, sc->sc_port, sc->sc_sda);
191 else
192 epgpio_in(sc->sc_gpio, sc->sc_port, sc->sc_sda);
193 }
194
195 uint32_t
armadillo9iic_bb_read_bits(void * cookie)196 armadillo9iic_bb_read_bits(void *cookie)
197 {
198 struct armadillo9iic_softc *sc = cookie;
199 uint32_t bits = 0;
200
201 bits |= epgpio_read(sc->sc_gpio, sc->sc_port, sc->sc_sda) << sc->sc_sda;
202 bits |= epgpio_read(sc->sc_gpio, sc->sc_port, sc->sc_scl) << sc->sc_scl;
203
204 return bits;
205 }
206