pca9564.c revision 1.6
1 /* $NetBSD: pca9564.c,v 1.6 2025/09/15 13:23:03 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2010 NONAKA Kimihiro <nonaka (at) netbsd.org> 5 * All rights reserved. 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: pca9564.c,v 1.6 2025/09/15 13:23:03 thorpej Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/device.h> 33 #include <sys/mutex.h> 34 #include <sys/bus.h> 35 36 #include <dev/i2c/i2cvar.h> 37 38 #include <dev/ic/pca9564reg.h> 39 #include <dev/ic/pca9564var.h> 40 41 #if defined(PCA9564_DEBUG) 42 int pca9564debug = 0; 43 #define DPRINTF(s) if (pca9564debug) printf s 44 #else 45 #define DPRINTF(s) 46 #endif 47 48 static int pca9564_acquire_bus(void *, int); 49 static void pca9564_release_bus(void *, int); 50 51 static int pca9564_send_start(void *, int); 52 static int pca9564_send_stop(void *, int); 53 static int pca9564_initiate_xfer(void *, uint16_t, int); 54 static int pca9564_read_byte(void *, uint8_t *, int); 55 static int pca9564_write_byte(void *, uint8_t, int); 56 57 static int pca9564_ack(void *, bool, int); 58 59 #define CSR_READ(sc, r) (*sc->sc_ios.read_byte)(sc->sc_dev, r) 60 #define CSR_WRITE(sc, r, v) (*sc->sc_ios.write_byte)(sc->sc_dev, r, v) 61 62 void 63 pca9564_attach(struct pca9564_softc *sc) 64 { 65 66 aprint_naive("\n"); 67 aprint_normal(": PCA9564 I2C Controller\n"); 68 69 iic_tag_init(&sc->sc_i2c); 70 sc->sc_i2c.ic_cookie = sc; 71 sc->sc_i2c.ic_acquire_bus = pca9564_acquire_bus; 72 sc->sc_i2c.ic_release_bus = pca9564_release_bus; 73 sc->sc_i2c.ic_send_start = pca9564_send_start; 74 sc->sc_i2c.ic_send_stop = pca9564_send_stop; 75 sc->sc_i2c.ic_initiate_xfer = pca9564_initiate_xfer; 76 sc->sc_i2c.ic_read_byte = pca9564_read_byte; 77 sc->sc_i2c.ic_write_byte = pca9564_write_byte; 78 79 /* set serial clock rate */ 80 switch (sc->sc_i2c_clock) { 81 case 330000: /* 330kHz */ 82 sc->sc_i2c_clock = I2CCON_CR_330KHZ; 83 break; 84 case 288000: /* 288kHz */ 85 sc->sc_i2c_clock = I2CCON_CR_288KHZ; 86 break; 87 case 217000: /* 217kHz */ 88 sc->sc_i2c_clock = I2CCON_CR_217KHZ; 89 break; 90 case 146000: /* 146kHz */ 91 sc->sc_i2c_clock = I2CCON_CR_146KHZ; 92 break; 93 case 88000: /* 88kHz */ 94 sc->sc_i2c_clock = I2CCON_CR_88KHZ; 95 break; 96 case 0: /* default */ 97 case 59000: /* 59kHz */ 98 sc->sc_i2c_clock = I2CCON_CR_59KHZ; 99 break; 100 case 44000: /* 44kHz */ 101 sc->sc_i2c_clock = I2CCON_CR_44KHZ; 102 break; 103 case 36000: /* 36kHz */ 104 sc->sc_i2c_clock = I2CCON_CR_36KHZ; 105 break; 106 default: 107 aprint_error_dev(sc->sc_dev, "unknown i2c clock %dHz\n", 108 sc->sc_i2c_clock); 109 sc->sc_i2c_clock = I2CCON_CR_59KHZ; 110 break; 111 } 112 113 iicbus_attach(sc->sc_dev, &sc->sc_i2c); 114 } 115 116 static int 117 pca9564_acquire_bus(void *cookie, int flags) 118 { 119 struct pca9564_softc *sc = cookie; 120 uint8_t control; 121 122 /* Enable SIO and set clock */ 123 control = CSR_READ(sc, PCA9564_I2CCON); 124 control |= I2CCON_ENSIO; 125 control &= ~(I2CCON_STA|I2CCON_STO|I2CCON_SI|I2CCON_AA); 126 control &= ~I2CCON_CR_MASK; 127 control |= sc->sc_i2c_clock; 128 CSR_WRITE(sc, PCA9564_I2CCON, control); 129 delay(500); 130 131 return 0; 132 } 133 134 static void 135 pca9564_release_bus(void *cookie, int flags) 136 { 137 struct pca9564_softc *sc = cookie; 138 uint8_t control; 139 140 /* Disable SIO */ 141 control = CSR_READ(sc, PCA9564_I2CCON); 142 control &= ~I2CCON_ENSIO; 143 CSR_WRITE(sc, PCA9564_I2CCON, control); 144 } 145 146 #define PCA9564_TIMEOUT 100 /* protocol timeout, in uSecs */ 147 148 static int 149 pca9564_wait(struct pca9564_softc *sc, int flags) 150 { 151 int timeout; 152 153 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 154 for (timeout = PCA9564_TIMEOUT; timeout > 0; timeout--) { 155 if (CSR_READ(sc, PCA9564_I2CCON) & I2CCON_SI) 156 break; 157 delay(1); 158 } 159 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 160 if (timeout == 0) { 161 aprint_error_dev(sc->sc_dev, "timeout\n"); 162 return ETIMEDOUT; 163 } 164 return 0; 165 } 166 167 static int 168 pca9564_send_start(void *cookie, int flags) 169 { 170 struct pca9564_softc *sc = cookie; 171 uint8_t control; 172 173 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 174 control = CSR_READ(sc, PCA9564_I2CCON); 175 control |= I2CCON_STA; 176 control &= ~(I2CCON_STO|I2CCON_SI); 177 CSR_WRITE(sc, PCA9564_I2CCON, control); 178 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 179 180 return pca9564_wait(sc, flags); 181 } 182 183 static int 184 pca9564_send_stop(void *cookie, int flags) 185 { 186 struct pca9564_softc *sc = cookie; 187 uint8_t control; 188 189 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 190 control = CSR_READ(sc, PCA9564_I2CCON); 191 control |= I2CCON_STO; 192 control &= ~(I2CCON_STA|I2CCON_SI); 193 CSR_WRITE(sc, PCA9564_I2CCON, control); 194 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 195 196 return 0; 197 } 198 199 static int 200 pca9564_initiate_xfer(void *cookie, uint16_t addr, int flags) 201 { 202 struct pca9564_softc *sc = cookie; 203 int error, rd_req = (flags & I2C_F_READ) != 0; 204 uint8_t data, control; 205 206 error = pca9564_send_start(sc, flags); 207 if (error) { 208 aprint_error_dev(sc->sc_dev, "failed to send start %s xfer\n", 209 rd_req ? "read" : "write"); 210 return error; 211 } 212 213 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 214 control = CSR_READ(sc, PCA9564_I2CCON); 215 216 data = (addr << 1) | (rd_req ? 1 : 0); 217 CSR_WRITE(sc, PCA9564_I2CDAT, data); 218 219 control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI); 220 CSR_WRITE(sc, PCA9564_I2CCON, control); 221 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 222 223 error = pca9564_wait(sc, flags); 224 if (error) 225 aprint_error_dev(sc->sc_dev, "failed to initiate %s xfer\n", 226 rd_req ? "read" : "write"); 227 return error; 228 } 229 230 static int 231 pca9564_read_byte(void *cookie, uint8_t *bytep, int flags) 232 { 233 struct pca9564_softc *sc = cookie; 234 int send_stop = (flags & I2C_F_STOP) != 0; 235 int error; 236 237 error = pca9564_ack(sc, !send_stop, flags); 238 if (error) { 239 aprint_error_dev(sc->sc_dev, "failed to ack\n"); 240 return error; 241 } 242 243 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 244 *bytep = CSR_READ(sc, PCA9564_I2CDAT); 245 DPRINTF(("%s: status=%#x, byte=%#x\n", __func__, 246 CSR_READ(sc, PCA9564_I2CSTA), *bytep)); 247 248 if (send_stop) 249 pca9564_send_stop(sc, flags); 250 251 return 0; 252 } 253 254 static int 255 pca9564_write_byte(void *cookie, uint8_t byte, int flags) 256 { 257 struct pca9564_softc *sc = cookie; 258 int send_stop = (flags & I2C_F_STOP) != 0; 259 int error; 260 uint8_t control; 261 262 DPRINTF(("%s: status=%#x, byte=%#x\n", __func__, 263 CSR_READ(sc, PCA9564_I2CSTA), byte)); 264 control = CSR_READ(sc, PCA9564_I2CCON); 265 266 CSR_WRITE(sc, PCA9564_I2CDAT, byte); 267 268 control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI); 269 CSR_WRITE(sc, PCA9564_I2CCON, control); 270 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 271 272 error = pca9564_wait(sc, flags); 273 if (error) 274 aprint_error_dev(sc->sc_dev, "write byte failed\n"); 275 276 if (send_stop) 277 pca9564_send_stop(sc, flags); 278 279 return error; 280 } 281 282 static int 283 pca9564_ack(void *cookie, bool ack, int flags) 284 { 285 struct pca9564_softc *sc = cookie; 286 uint8_t control; 287 288 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 289 control = CSR_READ(sc, PCA9564_I2CCON); 290 control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI|I2CCON_AA); 291 if (ack) 292 control |= I2CCON_AA; 293 CSR_WRITE(sc, PCA9564_I2CCON, control); 294 DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); 295 296 return pca9564_wait(sc, flags); 297 } 298
Indexes created Mon Sep 22 10:09:38 GMT 2025