/* $NetBSD: pca9564.c,v 1.2 2016/02/14 19:54:21 chs Exp $ */ /* * Copyright (c) 2010 NONAKA Kimihiro * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: pca9564.c,v 1.2 2016/02/14 19:54:21 chs Exp $"); #include #include #include #include #include #include #include #if defined(PCA9564_DEBUG) int pca9564debug = 0; #define DPRINTF(s) if (pca9564debug) printf s #else #define DPRINTF(s) #endif static int pca9564_acquire_bus(void *, int); static void pca9564_release_bus(void *, int); static int pca9564_send_start(void *, int); static int pca9564_send_stop(void *, int); static int pca9564_initiate_xfer(void *, uint16_t, int); static int pca9564_read_byte(void *, uint8_t *, int); static int pca9564_write_byte(void *, uint8_t, int); static int pca9564_ack(void *, bool, int); #define CSR_READ(sc, r) (*sc->sc_ios.read_byte)(sc->sc_dev, r) #define CSR_WRITE(sc, r, v) (*sc->sc_ios.write_byte)(sc->sc_dev, r, v) void pca9564_attach(struct pca9564_softc *sc) { struct i2cbus_attach_args iba; aprint_naive("\n"); aprint_normal(": PCA9564 I2C Controller\n"); mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE); sc->sc_i2c.ic_cookie = sc; sc->sc_i2c.ic_acquire_bus = pca9564_acquire_bus; sc->sc_i2c.ic_release_bus = pca9564_release_bus; sc->sc_i2c.ic_send_start = pca9564_send_start; sc->sc_i2c.ic_send_stop = pca9564_send_stop; sc->sc_i2c.ic_initiate_xfer = pca9564_initiate_xfer; sc->sc_i2c.ic_read_byte = pca9564_read_byte; sc->sc_i2c.ic_write_byte = pca9564_write_byte; sc->sc_i2c.ic_exec = NULL; /* set serial clock rate */ switch (sc->sc_i2c_clock) { case 330000: /* 330kHz */ sc->sc_i2c_clock = I2CCON_CR_330KHZ; break; case 288000: /* 288kHz */ sc->sc_i2c_clock = I2CCON_CR_288KHZ; break; case 217000: /* 217kHz */ sc->sc_i2c_clock = I2CCON_CR_217KHZ; break; case 146000: /* 146kHz */ sc->sc_i2c_clock = I2CCON_CR_146KHZ; break; case 88000: /* 88kHz */ sc->sc_i2c_clock = I2CCON_CR_88KHZ; break; case 0: /* default */ case 59000: /* 59kHz */ sc->sc_i2c_clock = I2CCON_CR_59KHZ; break; case 44000: /* 44kHz */ sc->sc_i2c_clock = I2CCON_CR_44KHZ; break; case 36000: /* 36kHz */ sc->sc_i2c_clock = I2CCON_CR_36KHZ; break; default: aprint_error_dev(sc->sc_dev, "unknown i2c clock %dHz\n", sc->sc_i2c_clock); sc->sc_i2c_clock = I2CCON_CR_59KHZ; break; } memset(&iba, 0, sizeof(iba)); iba.iba_tag = &sc->sc_i2c; (void) config_found_ia(sc->sc_dev, "i2cbus", &iba, iicbus_print); } static int pca9564_acquire_bus(void *cookie, int flags) { struct pca9564_softc *sc = cookie; uint8_t control; mutex_enter(&sc->sc_buslock); /* Enable SIO and set clock */ control = CSR_READ(sc, PCA9564_I2CCON); control |= I2CCON_ENSIO; control &= ~(I2CCON_STA|I2CCON_STO|I2CCON_SI|I2CCON_AA); control &= ~I2CCON_CR_MASK; control |= sc->sc_i2c_clock; CSR_WRITE(sc, PCA9564_I2CCON, control); delay(500); return 0; } static void pca9564_release_bus(void *cookie, int flags) { struct pca9564_softc *sc = cookie; uint8_t control; /* Disable SIO */ control = CSR_READ(sc, PCA9564_I2CCON); control &= ~I2CCON_ENSIO; CSR_WRITE(sc, PCA9564_I2CCON, control); mutex_exit(&sc->sc_buslock); } #define PCA9564_TIMEOUT 100 /* protocol timeout, in uSecs */ static int pca9564_wait(struct pca9564_softc *sc, int flags) { int timeout; DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); for (timeout = PCA9564_TIMEOUT; timeout > 0; timeout--) { if (CSR_READ(sc, PCA9564_I2CCON) & I2CCON_SI) break; delay(1); } DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); if (timeout == 0) { aprint_error_dev(sc->sc_dev, "timeout\n"); return ETIMEDOUT; } return 0; } static int pca9564_send_start(void *cookie, int flags) { struct pca9564_softc *sc = cookie; uint8_t control; DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); control = CSR_READ(sc, PCA9564_I2CCON); control |= I2CCON_STA; control &= ~(I2CCON_STO|I2CCON_SI); CSR_WRITE(sc, PCA9564_I2CCON, control); DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); return pca9564_wait(sc, flags); } static int pca9564_send_stop(void *cookie, int flags) { struct pca9564_softc *sc = cookie; uint8_t control; DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); control = CSR_READ(sc, PCA9564_I2CCON); control |= I2CCON_STO; control &= ~(I2CCON_STA|I2CCON_SI); CSR_WRITE(sc, PCA9564_I2CCON, control); DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); return 0; } static int pca9564_initiate_xfer(void *cookie, uint16_t addr, int flags) { struct pca9564_softc *sc = cookie; int error, rd_req = (flags & I2C_F_READ) != 0; uint8_t data, control; error = pca9564_send_start(sc, flags); if (error) { aprint_error_dev(sc->sc_dev, "failed to send start %s xfer\n", rd_req ? "read" : "write"); return error; } DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); control = CSR_READ(sc, PCA9564_I2CCON); data = (addr << 1) | (rd_req ? 1 : 0); CSR_WRITE(sc, PCA9564_I2CDAT, data); control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI); CSR_WRITE(sc, PCA9564_I2CCON, control); DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); error = pca9564_wait(sc, flags); if (error) aprint_error_dev(sc->sc_dev, "failed to initiate %s xfer\n", rd_req ? "read" : "write"); return error; } static int pca9564_read_byte(void *cookie, uint8_t *bytep, int flags) { struct pca9564_softc *sc = cookie; int send_stop = (flags & I2C_F_STOP) != 0; int error; error = pca9564_ack(sc, !send_stop, flags); if (error) { aprint_error_dev(sc->sc_dev, "failed to ack\n"); return error; } DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); *bytep = CSR_READ(sc, PCA9564_I2CDAT); DPRINTF(("%s: status=%#x, byte=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA), *bytep)); if (send_stop) pca9564_send_stop(sc, flags); return 0; } static int pca9564_write_byte(void *cookie, uint8_t byte, int flags) { struct pca9564_softc *sc = cookie; int send_stop = (flags & I2C_F_STOP) != 0; int error; uint8_t control; DPRINTF(("%s: status=%#x, byte=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA), byte)); control = CSR_READ(sc, PCA9564_I2CCON); CSR_WRITE(sc, PCA9564_I2CDAT, byte); control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI); CSR_WRITE(sc, PCA9564_I2CCON, control); DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); error = pca9564_wait(sc, flags); if (error) aprint_error_dev(sc->sc_dev, "write byte failed\n"); if (send_stop) pca9564_send_stop(sc, flags); return error; } static int pca9564_ack(void *cookie, bool ack, int flags) { struct pca9564_softc *sc = cookie; uint8_t control; DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); control = CSR_READ(sc, PCA9564_I2CCON); control &= ~(I2CCON_STO|I2CCON_STA|I2CCON_SI|I2CCON_AA); if (ack) control |= I2CCON_AA; CSR_WRITE(sc, PCA9564_I2CCON, control); DPRINTF(("%s: status=%#x\n", __func__, CSR_READ(sc, PCA9564_I2CSTA))); return pca9564_wait(sc, flags); }