xref: /netbsd-src/sys/arch/arm/imx/imxi2c.c (revision 66fba52e4619ef9a369226cff8c03152b1a40a11)
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