1 /* $NetBSD: imxi2c.c,v 1.4 2022/07/22 23:43:23 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 2012, 2015 Genetec Corporation. All rights reserved.
5 * Written by Hashimoto Kenichi for Genetec Corporation.
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 REGENTS 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 REGENTS 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: imxi2c.c,v 1.4 2022/07/22 23:43:23 thorpej Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/device.h>
35
36 #include <dev/i2c/motoi2cvar.h>
37 #include <dev/i2c/motoi2creg.h>
38 #include <arm/imx/imxi2cvar.h>
39
40 static const struct clk_div {
41 uint8_t ic_val;
42 int div;
43 } imxi2c_clk_div[] = {
44 {0x20, 22}, {0x21, 24}, {0x22, 26}, {0x23, 28},
45 {0x00, 30}, {0x01, 32}, {0x24, 32}, {0x02, 36},
46 {0x25, 36}, {0x26, 40}, {0x03, 42}, {0x27, 44},
47 {0x04, 48}, {0x28, 48}, {0x05, 52}, {0x29, 56},
48 {0x06, 60}, {0x2A, 64}, {0x07, 72}, {0x2B, 72},
49 {0x08, 80}, {0x2C, 80}, {0x09, 88}, {0x2D, 96},
50 {0x0A, 104}, {0x2E, 112}, {0x0B, 128}, {0x2F, 128},
51 {0x0C, 144}, {0x0D, 160}, {0x30, 160}, {0x0E, 192},
52 {0x31, 192}, {0x32, 224}, {0x0F, 240}, {0x33, 256},
53 {0x10, 288}, {0x11, 320}, {0x34, 320}, {0x12, 384},
54 {0x35, 384}, {0x36, 448}, {0x13, 480}, {0x37, 512},
55 {0x14, 576}, {0x15, 640}, {0x38, 640}, {0x16, 768},
56 {0x39, 768}, {0x3A, 896}, {0x17, 960}, {0x3B, 1024},
57 {0x18, 1152}, {0x19, 1280}, {0x3C, 1280}, {0x1A, 1536},
58 {0x3D, 1536}, {0x3E, 1792}, {0x1B, 1920}, {0x3F, 2048},
59 {0x1C, 2304}, {0x1D, 2560}, {0x1E, 3072}, {0x1F, 3840},
60 };
61
62 CFATTACH_DECL_NEW(imxi2c, sizeof(struct imxi2c_softc),
63 imxi2c_match, imxi2c_attach, NULL, NULL);
64
65 static uint8_t
imxi2c_iord1(struct motoi2c_softc * sc,bus_size_t off)66 imxi2c_iord1(struct motoi2c_softc *sc, bus_size_t off)
67 {
68 if (off < I2CDFSRR)
69 return bus_space_read_2(sc->sc_iot, sc->sc_ioh, off) & 0xff;
70 else
71 return 0;
72 }
73
74 static void
imxi2c_iowr1(struct motoi2c_softc * sc,bus_size_t off,uint8_t data)75 imxi2c_iowr1(struct motoi2c_softc *sc, bus_size_t off, uint8_t data)
76 {
77 if (off < I2CDFSRR)
78 bus_space_write_2(sc->sc_iot, sc->sc_ioh, off, data);
79 }
80
81 static void
imxi2c_set_freq(struct imxi2c_softc * imxsc,long freq,unsigned int speed)82 imxi2c_set_freq(struct imxi2c_softc *imxsc, long freq, unsigned int speed)
83 {
84 bool found = false;
85 int index;
86
87 for (index = 0; index < __arraycount(imxi2c_clk_div); index++) {
88 if (freq / imxi2c_clk_div[index].div < speed) {
89 found = true;
90 break;
91 }
92 }
93
94 if (found == false) {
95 imxsc->sc_motoi2c_settings.i2c_fdr = 0x1f;
96 } else {
97 imxsc->sc_motoi2c_settings.i2c_fdr =
98 imxi2c_clk_div[index].ic_val;
99 }
100 }
101
102 void
imxi2c_attach_common(device_t self,bus_space_tag_t iot,paddr_t iobase,size_t size,long freq,unsigned int speed)103 imxi2c_attach_common(device_t self, bus_space_tag_t iot, paddr_t iobase,
104 size_t size, long freq, unsigned int speed)
105 {
106 struct imxi2c_softc *imxsc = device_private(self);
107 struct motoi2c_softc *sc = &imxsc->sc_motoi2c;
108 int error;
109
110 aprint_naive("\n");
111 aprint_normal("\n");
112
113 sc->sc_dev = self;
114 sc->sc_iot = iot;
115 error = bus_space_map(sc->sc_iot, iobase, size, 0, &sc->sc_ioh);
116 if (error) {
117 aprint_error_dev(sc->sc_dev,
118 "failed to map registers (errno=%d)\n", error);
119 return;
120 }
121
122 imxsc->sc_motoi2c_settings.i2c_adr = MOTOI2C_ADR_DEFAULT;
123 imxsc->sc_motoi2c_settings.i2c_dfsrr = MOTOI2C_DFSRR_DEFAULT;
124 imxi2c_set_freq(imxsc, freq, speed);
125
126 sc->sc_iord = imxi2c_iord1;
127 sc->sc_iowr = imxi2c_iowr1;
128
129 motoi2c_attach(sc, &imxsc->sc_motoi2c_settings);
130 }
131