iomdiic.c revision 1.2.4.3
1 1.2.4.3 skrll /* $NetBSD: iomdiic.c,v 1.2.4.3 2004/09/18 14:32:32 skrll Exp $ */ 2 1.2.4.2 skrll 3 1.2.4.2 skrll /* 4 1.2.4.2 skrll * Copyright (c) 2003 Wasabi Systems, Inc. 5 1.2.4.2 skrll * All rights reserved. 6 1.2.4.2 skrll * 7 1.2.4.2 skrll * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 1.2.4.2 skrll * 9 1.2.4.2 skrll * Redistribution and use in source and binary forms, with or without 10 1.2.4.2 skrll * modification, are permitted provided that the following conditions 11 1.2.4.2 skrll * are met: 12 1.2.4.2 skrll * 1. Redistributions of source code must retain the above copyright 13 1.2.4.2 skrll * notice, this list of conditions and the following disclaimer. 14 1.2.4.2 skrll * 2. Redistributions in binary form must reproduce the above copyright 15 1.2.4.2 skrll * notice, this list of conditions and the following disclaimer in the 16 1.2.4.2 skrll * documentation and/or other materials provided with the distribution. 17 1.2.4.2 skrll * 3. All advertising materials mentioning features or use of this software 18 1.2.4.2 skrll * must display the following acknowledgement: 19 1.2.4.2 skrll * This product includes software developed for the NetBSD Project by 20 1.2.4.2 skrll * Wasabi Systems, Inc. 21 1.2.4.2 skrll * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 1.2.4.2 skrll * or promote products derived from this software without specific prior 23 1.2.4.2 skrll * written permission. 24 1.2.4.2 skrll * 25 1.2.4.2 skrll * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 1.2.4.2 skrll * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 1.2.4.2 skrll * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 1.2.4.2 skrll * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 1.2.4.2 skrll * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 1.2.4.2 skrll * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 1.2.4.2 skrll * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 1.2.4.2 skrll * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 1.2.4.2 skrll * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 1.2.4.2 skrll * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 1.2.4.2 skrll * POSSIBILITY OF SUCH DAMAGE. 36 1.2.4.2 skrll */ 37 1.2.4.2 skrll 38 1.2.4.2 skrll #include <sys/param.h> 39 1.2.4.2 skrll #include <sys/device.h> 40 1.2.4.2 skrll #include <sys/kernel.h> 41 1.2.4.2 skrll #include <sys/systm.h> 42 1.2.4.2 skrll #include <sys/lock.h> 43 1.2.4.2 skrll 44 1.2.4.2 skrll #include <machine/bus.h> 45 1.2.4.2 skrll #include <machine/cpu.h> 46 1.2.4.2 skrll 47 1.2.4.2 skrll #include <arm/iomd/iomdreg.h> 48 1.2.4.2 skrll #include <arm/iomd/iomdvar.h> 49 1.2.4.2 skrll 50 1.2.4.2 skrll #include <dev/i2c/i2cvar.h> 51 1.2.4.2 skrll #include <dev/i2c/i2c_bitbang.h> 52 1.2.4.2 skrll 53 1.2.4.2 skrll #include <arm/iomd/iomdiicvar.h> 54 1.2.4.2 skrll 55 1.2.4.2 skrll struct iomdiic_softc { 56 1.2.4.2 skrll struct device sc_dev; 57 1.2.4.2 skrll bus_space_tag_t sc_st; 58 1.2.4.2 skrll bus_space_handle_t sc_sh; 59 1.2.4.2 skrll 60 1.2.4.2 skrll struct i2c_controller sc_i2c; 61 1.2.4.2 skrll struct lock sc_buslock; 62 1.2.4.2 skrll 63 1.2.4.2 skrll /* 64 1.2.4.2 skrll * The SDA pin is open-drain, so we make it an input by 65 1.2.4.2 skrll * writing a 1 to it. 66 1.2.4.2 skrll */ 67 1.2.4.2 skrll uint8_t sc_iomd_iocr; 68 1.2.4.2 skrll }; 69 1.2.4.2 skrll 70 1.2.4.2 skrll static int iomdiic_acquire_bus(void *, int); 71 1.2.4.2 skrll static void iomdiic_release_bus(void *, int); 72 1.2.4.2 skrll 73 1.2.4.2 skrll static int iomdiic_send_start(void *, int); 74 1.2.4.2 skrll static int iomdiic_send_stop(void *, int); 75 1.2.4.2 skrll static int iomdiic_initiate_xfer(void *, i2c_addr_t, int); 76 1.2.4.2 skrll static int iomdiic_read_byte(void *, uint8_t *, int); 77 1.2.4.2 skrll static int iomdiic_write_byte(void *, uint8_t, int); 78 1.2.4.2 skrll 79 1.2.4.2 skrll #define IOMDIIC_READ *(__volatile uint8_t *)(IOMD_ADDRESS(IOMD_IOCR)) 80 1.2.4.2 skrll #define IOMDIIC_WRITE(x) *(__volatile uint8_t *)(IOMD_ADDRESS(IOMD_IOCR)) = (x) 81 1.2.4.2 skrll 82 1.2.4.2 skrll #define IOMD_IOCR_SDA 0x01 83 1.2.4.2 skrll #define IOMD_IOCR_SCL 0x02 84 1.2.4.2 skrll 85 1.2.4.2 skrll static void 86 1.2.4.2 skrll iomdiic_bb_set_bits(void *cookie, uint32_t bits) 87 1.2.4.2 skrll { 88 1.2.4.2 skrll struct iomdiic_softc *sc = cookie; 89 1.2.4.2 skrll 90 1.2.4.2 skrll IOMDIIC_WRITE((IOMDIIC_READ & ~(IOMD_IOCR_SDA|IOMD_IOCR_SCL)) | 91 1.2.4.2 skrll sc->sc_iomd_iocr | bits); 92 1.2.4.2 skrll } 93 1.2.4.2 skrll 94 1.2.4.2 skrll static void 95 1.2.4.2 skrll iomdiic_bb_set_dir(void *cookie, uint32_t bits) 96 1.2.4.2 skrll { 97 1.2.4.2 skrll struct iomdiic_softc *sc = cookie; 98 1.2.4.2 skrll 99 1.2.4.2 skrll sc->sc_iomd_iocr = bits; 100 1.2.4.2 skrll } 101 1.2.4.2 skrll 102 1.2.4.2 skrll static uint32_t 103 1.2.4.2 skrll iomdiic_bb_read_bits(void *cookie) 104 1.2.4.2 skrll { 105 1.2.4.2 skrll 106 1.2.4.2 skrll return (IOMDIIC_READ); 107 1.2.4.2 skrll } 108 1.2.4.2 skrll 109 1.2.4.2 skrll static const struct i2c_bitbang_ops iomdiic_bbops = { 110 1.2.4.2 skrll iomdiic_bb_set_bits, 111 1.2.4.2 skrll iomdiic_bb_set_dir, 112 1.2.4.2 skrll iomdiic_bb_read_bits, 113 1.2.4.2 skrll { 114 1.2.4.2 skrll IOMD_IOCR_SDA, /* SDA */ 115 1.2.4.2 skrll IOMD_IOCR_SCL, /* SCL */ 116 1.2.4.2 skrll 0, /* SDA is output */ 117 1.2.4.2 skrll IOMD_IOCR_SDA, /* SDA is input */ 118 1.2.4.2 skrll } 119 1.2.4.2 skrll }; 120 1.2.4.2 skrll 121 1.2.4.2 skrll static int 122 1.2.4.2 skrll iomdiic_match(struct device *parent, struct cfdata *cf, void *aux) 123 1.2.4.2 skrll { 124 1.2.4.2 skrll struct iic_attach_args *ia = aux; 125 1.2.4.2 skrll 126 1.2.4.2 skrll if (strcmp(ia->ia_name, "iic") == 0) return 1; 127 1.2.4.2 skrll return 0; 128 1.2.4.2 skrll } 129 1.2.4.2 skrll 130 1.2.4.2 skrll static void 131 1.2.4.2 skrll iomdiic_attach(struct device *parent, struct device *self, void *aux) 132 1.2.4.2 skrll { 133 1.2.4.2 skrll struct iomdiic_softc *sc = (void *) self; 134 1.2.4.2 skrll struct i2cbus_attach_args iba; 135 1.2.4.2 skrll 136 1.2.4.2 skrll printf("\n"); 137 1.2.4.2 skrll 138 1.2.4.2 skrll lockinit(&sc->sc_buslock, PRIBIO|PCATCH, "iomdiiclk", 0, 0); 139 1.2.4.2 skrll 140 1.2.4.2 skrll sc->sc_i2c.ic_cookie = sc; 141 1.2.4.2 skrll sc->sc_i2c.ic_acquire_bus = iomdiic_acquire_bus; 142 1.2.4.2 skrll sc->sc_i2c.ic_release_bus = iomdiic_release_bus; 143 1.2.4.2 skrll sc->sc_i2c.ic_send_start = iomdiic_send_start; 144 1.2.4.2 skrll sc->sc_i2c.ic_send_stop = iomdiic_send_stop; 145 1.2.4.2 skrll sc->sc_i2c.ic_initiate_xfer = iomdiic_initiate_xfer; 146 1.2.4.2 skrll sc->sc_i2c.ic_read_byte = iomdiic_read_byte; 147 1.2.4.2 skrll sc->sc_i2c.ic_write_byte = iomdiic_write_byte; 148 1.2.4.2 skrll 149 1.2.4.2 skrll iba.iba_name = "iic"; 150 1.2.4.2 skrll iba.iba_tag = &sc->sc_i2c; 151 1.2.4.2 skrll (void) config_found(&sc->sc_dev, &iba, iicbus_print); 152 1.2.4.2 skrll } 153 1.2.4.2 skrll 154 1.2.4.2 skrll CFATTACH_DECL(iomdiic, sizeof(struct iomdiic_softc), 155 1.2.4.2 skrll iomdiic_match, iomdiic_attach, NULL, NULL); 156 1.2.4.2 skrll 157 1.2.4.2 skrll i2c_tag_t 158 1.2.4.2 skrll iomdiic_bootstrap_cookie(void) 159 1.2.4.2 skrll { 160 1.2.4.2 skrll static struct iomdiic_softc sc; 161 1.2.4.2 skrll 162 1.2.4.2 skrll /* XXX Yuck. */ 163 1.2.4.2 skrll strcpy(sc.sc_dev.dv_xname, "iomdiicboot"); 164 1.2.4.2 skrll 165 1.2.4.2 skrll sc.sc_i2c.ic_cookie = ≻ 166 1.2.4.2 skrll sc.sc_i2c.ic_acquire_bus = iomdiic_acquire_bus; 167 1.2.4.2 skrll sc.sc_i2c.ic_release_bus = iomdiic_release_bus; 168 1.2.4.2 skrll sc.sc_i2c.ic_send_start = iomdiic_send_start; 169 1.2.4.2 skrll sc.sc_i2c.ic_send_stop = iomdiic_send_stop; 170 1.2.4.2 skrll sc.sc_i2c.ic_initiate_xfer = iomdiic_initiate_xfer; 171 1.2.4.2 skrll sc.sc_i2c.ic_read_byte = iomdiic_read_byte; 172 1.2.4.2 skrll sc.sc_i2c.ic_write_byte = iomdiic_write_byte; 173 1.2.4.2 skrll 174 1.2.4.2 skrll return ((void *) &sc.sc_i2c); 175 1.2.4.2 skrll } 176 1.2.4.2 skrll 177 1.2.4.2 skrll static int 178 1.2.4.2 skrll iomdiic_acquire_bus(void *cookie, int flags) 179 1.2.4.2 skrll { 180 1.2.4.2 skrll struct iomdiic_softc *sc = cookie; 181 1.2.4.2 skrll 182 1.2.4.2 skrll /* XXX What should we do for the polling case? */ 183 1.2.4.2 skrll if (flags & I2C_F_POLL) 184 1.2.4.2 skrll return (0); 185 1.2.4.2 skrll 186 1.2.4.2 skrll return (lockmgr(&sc->sc_buslock, LK_EXCLUSIVE, NULL)); 187 1.2.4.2 skrll } 188 1.2.4.2 skrll 189 1.2.4.2 skrll static void 190 1.2.4.2 skrll iomdiic_release_bus(void *cookie, int flags) 191 1.2.4.2 skrll { 192 1.2.4.2 skrll struct iomdiic_softc *sc = cookie; 193 1.2.4.2 skrll 194 1.2.4.2 skrll /* XXX See above. */ 195 1.2.4.2 skrll if (flags & I2C_F_POLL) 196 1.2.4.2 skrll return; 197 1.2.4.2 skrll 198 1.2.4.2 skrll (void) lockmgr(&sc->sc_buslock, LK_RELEASE, NULL); 199 1.2.4.2 skrll } 200 1.2.4.2 skrll 201 1.2.4.2 skrll static int 202 1.2.4.2 skrll iomdiic_send_start(void *cookie, int flags) 203 1.2.4.2 skrll { 204 1.2.4.2 skrll 205 1.2.4.2 skrll return (i2c_bitbang_send_start(cookie, flags, &iomdiic_bbops)); 206 1.2.4.2 skrll } 207 1.2.4.2 skrll 208 1.2.4.2 skrll static int 209 1.2.4.2 skrll iomdiic_send_stop(void *cookie, int flags) 210 1.2.4.2 skrll { 211 1.2.4.2 skrll 212 1.2.4.2 skrll return (i2c_bitbang_send_stop(cookie, flags, &iomdiic_bbops)); 213 1.2.4.2 skrll } 214 1.2.4.2 skrll 215 1.2.4.2 skrll static int 216 1.2.4.2 skrll iomdiic_initiate_xfer(void *cookie, i2c_addr_t addr, int flags) 217 1.2.4.2 skrll { 218 1.2.4.2 skrll 219 1.2.4.2 skrll return (i2c_bitbang_initiate_xfer(cookie, addr, flags, &iomdiic_bbops)); 220 1.2.4.2 skrll } 221 1.2.4.2 skrll 222 1.2.4.2 skrll static int 223 1.2.4.2 skrll iomdiic_read_byte(void *cookie, uint8_t *bytep, int flags) 224 1.2.4.2 skrll { 225 1.2.4.2 skrll 226 1.2.4.2 skrll return (i2c_bitbang_read_byte(cookie, bytep, flags, &iomdiic_bbops)); 227 1.2.4.2 skrll } 228 1.2.4.2 skrll 229 1.2.4.2 skrll static int 230 1.2.4.2 skrll iomdiic_write_byte(void *cookie, uint8_t byte, int flags) 231 1.2.4.2 skrll { 232 1.2.4.2 skrll 233 1.2.4.2 skrll return (i2c_bitbang_write_byte(cookie, byte, flags, &iomdiic_bbops)); 234 1.2.4.2 skrll } 235
Indexes created Thu Oct 30 16:09:53 GMT 2025