1 /* $NetBSD: imxi2c.c,v 1.2 2015/03/27 05:31:23 hkenken 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 1.2 2015/03/27 05:31:23 hkenken Exp $"); 31 32 #include "opt_imx.h" 33 34 #include <sys/param.h> 35 #include <sys/bus.h> 36 #include <sys/device.h> 37 38 #include <dev/i2c/motoi2cvar.h> 39 #include <dev/i2c/motoi2creg.h> 40 #include <arm/imx/imxi2cvar.h> 41 42 struct clk_div { 43 uint8_t ic_val; 44 int div; 45 }; 46 47 static const struct clk_div imxi2c_clk_div[] = { 48 {0x20, 22}, {0x21, 24}, {0x22, 26}, {0x23, 28}, 49 {0x00, 30}, {0x01, 32}, {0x24, 32}, {0x02, 36}, 50 {0x25, 36}, {0x26, 40}, {0x03, 42}, {0x27, 44}, 51 {0x04, 48}, {0x28, 48}, {0x05, 52}, {0x29, 56}, 52 {0x06, 60}, {0x2A, 64}, {0x07, 72}, {0x2B, 72}, 53 {0x08, 80}, {0x2C, 80}, {0x09, 88}, {0x2D, 96}, 54 {0x0A, 104}, {0x2E, 112}, {0x0B, 128}, {0x2F, 128}, 55 {0x0C, 144}, {0x0D, 160}, {0x30, 160}, {0x0E, 192}, 56 {0x31, 192}, {0x32, 224}, {0x0F, 240}, {0x33, 256}, 57 {0x10, 288}, {0x11, 320}, {0x34, 320}, {0x12, 384}, 58 {0x35, 384}, {0x36, 448}, {0x13, 480}, {0x37, 512}, 59 {0x14, 576}, {0x15, 640}, {0x38, 640}, {0x16, 768}, 60 {0x39, 768}, {0x3A, 896}, {0x17, 960}, {0x3B, 1024}, 61 {0x18, 1152}, {0x19, 1280}, {0x3C, 1280}, {0x1A, 1536}, 62 {0x3D, 1536}, {0x3E, 1792}, {0x1B, 1920}, {0x3F, 2048}, 63 {0x1C, 2304}, {0x1D, 2560}, {0x1E, 3072}, {0x1F, 3840}, 64 }; 65 66 CFATTACH_DECL_NEW(imxi2c, sizeof(struct imxi2c_softc), 67 imxi2c_match, imxi2c_attach, NULL, NULL); 68 69 static uint8_t 70 imxi2c_iord1(struct motoi2c_softc *sc, bus_size_t off) 71 { 72 if (off < I2CDFSRR) 73 return bus_space_read_2(sc->sc_iot, sc->sc_ioh, off) & 0xff; 74 else 75 return 0; 76 } 77 78 static void 79 imxi2c_iowr1(struct motoi2c_softc *sc, bus_size_t off, uint8_t data) 80 { 81 if (off < I2CDFSRR) 82 bus_space_write_2(sc->sc_iot, sc->sc_ioh, off, data); 83 } 84 85 int 86 imxi2c_attach_common(device_t parent, device_t self, 87 bus_space_tag_t iot, paddr_t iobase, size_t size, int intr, int flags) 88 { 89 struct imxi2c_softc *sc = device_private(self); 90 struct motoi2c_softc *msc = &sc->sc_motoi2c; 91 int error; 92 93 aprint_naive("\n"); 94 aprint_normal("\n"); 95 96 sc->sc_dev = self; 97 msc->sc_iot = iot; 98 error = bus_space_map(msc->sc_iot, iobase, size, 0, &msc->sc_ioh); 99 if (error) { 100 aprint_error_dev(sc->sc_dev, 101 "failed to map registers (errno=%d)\n", error); 102 return 1; 103 } 104 105 sc->sc_motoi2c_settings.i2c_adr = MOTOI2C_ADR_DEFAULT; 106 sc->sc_motoi2c_settings.i2c_dfsrr = MOTOI2C_DFSRR_DEFAULT; 107 msc->sc_iord = imxi2c_iord1; 108 msc->sc_iowr = imxi2c_iowr1; 109 110 motoi2c_attach_common(self, msc, &sc->sc_motoi2c_settings); 111 112 return 0; 113 } 114 115 int 116 imxi2c_set_freq(device_t self, long freq, int speed) 117 { 118 struct imxi2c_softc *sc = device_private(self); 119 bool found = false; 120 int index; 121 122 for (index = 0; index < __arraycount(imxi2c_clk_div); index++) { 123 if (freq / imxi2c_clk_div[index].div < speed) { 124 found = true; 125 break; 126 } 127 } 128 129 if (found == false) 130 sc->sc_motoi2c_settings.i2c_fdr = 0x1f; 131 else 132 sc->sc_motoi2c_settings.i2c_fdr = imxi2c_clk_div[index].ic_val; 133 134 return 0; 135 } 136