/* $NetBSD: jbus-i2c.c,v 1.7 2021/08/07 16:19:05 thorpej Exp $ */ /* * Copyright (c) 2018 Michael Lorenz * 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: jbus-i2c.c,v 1.7 2021/08/07 16:19:05 thorpej Exp $"); #include #include #include #include #include #include #include #include #ifdef JBUSI2C_DEBUG #define DPRINTF printf #else #define DPRINTF if (0) printf #endif /* I2C glue */ static int jbusi2c_i2c_send_start(void *, int); static int jbusi2c_i2c_send_stop(void *, int); static int jbusi2c_i2c_initiate_xfer(void *, i2c_addr_t, int); static int jbusi2c_i2c_read_byte(void *, uint8_t *, int); static int jbusi2c_i2c_write_byte(void *, uint8_t, int); /* I2C bitbang glue */ static void jbusi2c_i2cbb_set_bits(void *, uint32_t); static void jbusi2c_i2cbb_set_dir(void *, uint32_t); static uint32_t jbusi2c_i2cbb_read(void *); static const struct i2c_bitbang_ops jbusi2c_i2cbb_ops = { jbusi2c_i2cbb_set_bits, jbusi2c_i2cbb_set_dir, jbusi2c_i2cbb_read, { 2, /* bit 1 is data */ 1, /* bit 0 is clock */ 3, /* direction register for both out */ 1 /* data in, clock out */ } }; static int jbusi2c_match(device_t, cfdata_t, void *); static void jbusi2c_attach(device_t, device_t, void *); struct jbusi2c_softc { device_t sc_dev; struct i2c_controller sc_i2c; bus_space_tag_t sc_bustag; bus_space_handle_t sc_regh; int sc_node; }; static void jbusi2c_setup_i2c(struct jbusi2c_softc *); CFATTACH_DECL_NEW(jbusi2c, sizeof(struct jbusi2c_softc), jbusi2c_match, jbusi2c_attach, NULL, NULL); /* schizo GPIO registers */ #define DATA 0 #define DIR 8 int jbusi2c_match(device_t parent, cfdata_t match, void *aux) { struct mainbus_attach_args *ma = aux; char *str; if (strcmp(ma->ma_name, "i2c") != 0) return (0); str = prom_getpropstring(ma->ma_node, "compatible"); if (strcmp(str, "jbus-i2c") == 0) return (1); return (0); } void jbusi2c_attach(device_t parent, device_t self, void *aux) { struct jbusi2c_softc *sc = device_private(self); struct mainbus_attach_args *ma = aux; aprint_normal(": addr %" PRIx64 "\n", ma->ma_reg[0].ur_paddr); sc->sc_dev = self; sc->sc_node = ma->ma_node; sc->sc_bustag = ma->ma_bustag; if (bus_space_map(sc->sc_bustag, ma->ma_reg[0].ur_paddr, 16, 0, &sc->sc_regh)) { aprint_error(": failed to map registers\n"); return; } jbusi2c_setup_i2c(sc); } static void jbusi2c_setup_i2c(struct jbusi2c_softc *sc) { struct i2cbus_attach_args iba; prop_array_t cfg; prop_dictionary_t dev; prop_dictionary_t dict = device_properties(sc->sc_dev); int devs, regs[2], addr; char name[64], compat[256]; iic_tag_init(&sc->sc_i2c); sc->sc_i2c.ic_cookie = sc; sc->sc_i2c.ic_send_start = jbusi2c_i2c_send_start; sc->sc_i2c.ic_send_stop = jbusi2c_i2c_send_stop; sc->sc_i2c.ic_initiate_xfer = jbusi2c_i2c_initiate_xfer; sc->sc_i2c.ic_read_byte = jbusi2c_i2c_read_byte; sc->sc_i2c.ic_write_byte = jbusi2c_i2c_write_byte; /* round up i2c devices */ devs = OF_child(sc->sc_node); cfg = prop_array_create(); prop_dictionary_set(dict, "i2c-child-devices", cfg); prop_object_release(cfg); while (devs != 0) { if (OF_getprop(devs, "name", name, 256) <= 0) goto skip; memset(compat, 0, sizeof(compat)); if (OF_getprop(devs, "compatible", compat, 255) <= 0) goto skip; if (OF_getprop(devs, "reg", regs, 8) <= 0) goto skip; if (regs[0] != 0) goto skip; addr = (regs[1] & 0xff) >> 1; DPRINTF("-> %s@%d,%x\n", name, regs[0], addr); dev = prop_dictionary_create(); prop_dictionary_set_string(dev, "name", name); prop_dictionary_set_data(dev, "compatible", compat, strlen(compat)+1); prop_dictionary_set_uint32(dev, "addr", addr); prop_dictionary_set_uint64(dev, "cookie", devs); prop_array_add(cfg, dev); prop_object_release(dev); skip: devs = OF_peer(devs); } memset(&iba, 0, sizeof(iba)); iba.iba_tag = &sc->sc_i2c; config_found(sc->sc_dev, &iba, iicbus_print, CFARGS_NONE); } static inline void jbusi2c_write(struct jbusi2c_softc *sc, int reg, uint64_t bits) { bus_space_write_8(sc->sc_bustag, sc->sc_regh, reg, bits); } static inline uint64_t jbusi2c_read(struct jbusi2c_softc *sc, int reg) { return bus_space_read_8(sc->sc_bustag, sc->sc_regh, reg); } /* I2C bitbanging */ static void jbusi2c_i2cbb_set_bits(void *cookie, uint32_t bits) { struct jbusi2c_softc *sc = cookie; jbusi2c_write(sc, DATA, bits); } static void jbusi2c_i2cbb_set_dir(void *cookie, uint32_t dir) { struct jbusi2c_softc *sc = cookie; jbusi2c_write(sc, DIR, dir); } static uint32_t jbusi2c_i2cbb_read(void *cookie) { struct jbusi2c_softc *sc = cookie; return jbusi2c_read(sc, DATA); } /* higher level I2C stuff */ static int jbusi2c_i2c_send_start(void *cookie, int flags) { return i2c_bitbang_send_start(cookie, flags, &jbusi2c_i2cbb_ops); } static int jbusi2c_i2c_send_stop(void *cookie, int flags) { return i2c_bitbang_send_stop(cookie, flags, &jbusi2c_i2cbb_ops); } static int jbusi2c_i2c_initiate_xfer(void *cookie, i2c_addr_t addr, int flags) { return i2c_bitbang_initiate_xfer(cookie, addr, flags, &jbusi2c_i2cbb_ops); } static int jbusi2c_i2c_read_byte(void *cookie, uint8_t *valp, int flags) { return i2c_bitbang_read_byte(cookie, valp, flags, &jbusi2c_i2cbb_ops); } static int jbusi2c_i2c_write_byte(void *cookie, uint8_t val, int flags) { return i2c_bitbang_write_byte(cookie, val, flags, &jbusi2c_i2cbb_ops); }