/* $NetBSD: i2cmux_fdt.c,v 1.10 2021/01/27 03:10:21 thorpej Exp $ */ /*- * Copyright (c) 2020 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe. * * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION OR CONTRIBUTORS * 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: i2cmux_fdt.c,v 1.10 2021/01/27 03:10:21 thorpej Exp $"); #include #include #include #include #include #include #include #include /*****************************************************************************/ struct mux_info_gpio { struct fdtbus_gpio_pin **pins; int npins; uint32_t idle_value; bool has_idle_value; }; struct bus_info_gpio { bus_addr_t value; }; static void * iicmux_gpio_get_mux_info(struct iicmux_softc * const sc) { struct mux_info_gpio *mux_data; int i; mux_data = kmem_zalloc(sizeof(*mux_data), KM_SLEEP); mux_data->npins = fdtbus_gpio_count(sc->sc_handle, "mux-gpios"); if (mux_data->npins == 0) { aprint_error_dev(sc->sc_dev, "unable to get mux-gpios property\n"); goto bad; } mux_data->pins = kmem_zalloc(sizeof(*mux_data->pins) * mux_data->npins, KM_SLEEP); for (i = 0; i < mux_data->npins; i++) { mux_data->pins[i] = fdtbus_gpio_acquire_index(sc->sc_handle, "mux-gpios", i, GPIO_PIN_OUTPUT); if (mux_data->pins[i] == NULL) { aprint_error_dev(sc->sc_dev, "unable to acquire gpio #%d\n", i); goto bad; } } mux_data->has_idle_value = of_getprop_uint32(sc->sc_handle, "idle-state", &mux_data->idle_value) == 0; return mux_data; bad: for (i = 0; i < mux_data->npins; i++) { if (mux_data->pins[i] != NULL) { fdtbus_gpio_release(mux_data->pins[i]); } } kmem_free(mux_data, sizeof(*mux_data)); return NULL; } static void * iicmux_gpio_get_bus_info(struct iicmux_bus * const bus) { struct iicmux_softc * const sc = bus->mux; struct bus_info_gpio *bus_info; int error; bus_info = kmem_zalloc(sizeof(*bus_info), KM_SLEEP); error = fdtbus_get_reg(bus->handle, 0, &bus_info->value, NULL); if (error) { aprint_error_dev(sc->sc_dev, "unable to get reg property for bus %d\n", bus->busidx); kmem_free(bus_info, sizeof(*bus_info)); return NULL; } return bus_info; } static void iicmux_gpio_set_value(struct iicmux_softc * const sc, bus_addr_t value) { struct mux_info_gpio * const mux_info = sc->sc_mux_data; int i; for (i = 0; i < mux_info->npins; i++, value >>= 1) { fdtbus_gpio_write(mux_info->pins[i], value & 1); } } static int iicmux_gpio_acquire_bus(struct iicmux_bus * const bus, int const flags __unused) { struct bus_info_gpio * const bus_info = bus->bus_data; iicmux_gpio_set_value(bus->mux, bus_info->value); return 0; } static void iicmux_gpio_release_bus(struct iicmux_bus * const bus, int const flags __unused) { struct iicmux_softc * const sc = bus->mux; struct mux_info_gpio * const mux_info = sc->sc_mux_data; if (mux_info->has_idle_value) { iicmux_gpio_set_value(sc, mux_info->idle_value); } } static const struct iicmux_config iicmux_gpio_config = { .desc = "GPIO", .get_mux_info = iicmux_gpio_get_mux_info, .get_bus_info = iicmux_gpio_get_bus_info, .acquire_bus = iicmux_gpio_acquire_bus, .release_bus = iicmux_gpio_release_bus, }; /*****************************************************************************/ struct mux_info_pinctrl { u_int idle_idx; bool has_idle_idx; } sc_pinctrl; struct bus_info_pinctrl { bus_addr_t idx; }; static void * iicmux_pinctrl_get_mux_info(struct iicmux_softc * const sc) { struct mux_info_pinctrl *mux_info; mux_info = kmem_alloc(sizeof(*mux_info), KM_SLEEP); mux_info->has_idle_idx = fdtbus_get_index(sc->sc_handle, "pinctrl-names", "idle", &mux_info->idle_idx) == 0; return mux_info; } static void * iicmux_pinctrl_get_bus_info(struct iicmux_bus * const bus) { struct iicmux_softc * const sc = bus->mux; struct bus_info_pinctrl *bus_info; int error; bus_info = kmem_alloc(sizeof(*bus_info), KM_SLEEP); error = fdtbus_get_reg(bus->handle, 0, &bus_info->idx, NULL); if (error) { aprint_error_dev(sc->sc_dev, "unable to get reg property for bus %d\n", bus->busidx); kmem_free(bus_info, sizeof(*bus_info)); return NULL; } return bus_info; } static int iicmux_pinctrl_acquire_bus(struct iicmux_bus * const bus, int const flags __unused) { struct iicmux_softc * const sc = bus->mux; struct bus_info_pinctrl * const bus_info = bus->bus_data; return fdtbus_pinctrl_set_config_index(sc->sc_handle, bus_info->idx); } static void iicmux_pinctrl_release_bus(struct iicmux_bus * const bus, int const flags __unused) { struct iicmux_softc * const sc = bus->mux; struct mux_info_pinctrl * const mux_info = sc->sc_mux_data; if (mux_info->has_idle_idx) { (void) fdtbus_pinctrl_set_config_index(sc->sc_handle, mux_info->idle_idx); } } static const struct iicmux_config iicmux_pinctrl_config = { .desc = "PinMux", .get_mux_info = iicmux_pinctrl_get_mux_info, .get_bus_info = iicmux_pinctrl_get_bus_info, .acquire_bus = iicmux_pinctrl_acquire_bus, .release_bus = iicmux_pinctrl_release_bus, }; /*****************************************************************************/ static const struct device_compatible_entry compat_data[] = { { .compat = "i2c-mux-gpio", .data = &iicmux_gpio_config }, { .compat = "i2c-mux-pinctrl", .data = &iicmux_pinctrl_config }, DEVICE_COMPAT_EOL }; static int iicmux_fdt_match(device_t const parent, cfdata_t const match, void * const aux) { struct fdt_attach_args * const faa = aux; return of_compatible_match(faa->faa_phandle, compat_data); } static void iicmux_fdt_attach(device_t const parent, device_t const self, void * const aux) { struct iicmux_softc * const sc = device_private(self); struct fdt_attach_args * const faa = aux; sc->sc_dev = self; sc->sc_handle = faa->faa_phandle; sc->sc_config = of_compatible_lookup(sc->sc_handle, compat_data)->data; aprint_naive("\n"); aprint_normal(": %s I2C mux\n", sc->sc_config->desc); sc->sc_i2c_parent = fdtbus_i2c_acquire(sc->sc_handle, "i2c-parent"); if (sc->sc_i2c_parent == NULL) { aprint_error_dev(sc->sc_dev, "unable to acquire i2c-parent\n"); return; } iicmux_attach(sc); } CFATTACH_DECL_NEW(iicmux_fdt, sizeof(struct iicmux_softc), iicmux_fdt_match, iicmux_fdt_attach, NULL, NULL);