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      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
     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
     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
     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
    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