/*- * Copyright 2013-2015 John Wehle * 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 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 AUTHOR 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. */ /* * Amlogic aml8726 I2C driver. * * Currently this implementation doesn't take full advantage of the hardware. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "iicbb_if.h" struct aml8726_iic_softc { device_t dev; struct resource *res[1]; struct mtx mtx; device_t iicbb; }; static struct resource_spec aml8726_iic_spec[] = { { SYS_RES_MEMORY, 0, RF_ACTIVE }, { -1, 0 } }; #define AML_I2C_LOCK(sc) mtx_lock(&(sc)->mtx) #define AML_I2C_UNLOCK(sc) mtx_unlock(&(sc)->mtx) #define AML_I2C_LOCK_INIT(sc) \ mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev), \ "i2c", MTX_DEF) #define AML_I2C_LOCK_DESTROY(sc) mtx_destroy(&(sc)->mtx); #define AML_I2C_CTRL_REG 0 #define AML_I2C_MANUAL_SDA_I (1 << 26) #define AML_I2C_MANUAL_SCL_I (1 << 25) #define AML_I2C_MANUAL_SDA_O (1 << 24) #define AML_I2C_MANUAL_SCL_O (1 << 23) #define AML_I2C_MANUAL_EN (1 << 22) #define CSR_WRITE_4(sc, reg, val) bus_write_4((sc)->res[0], reg, (val)) #define CSR_READ_4(sc, reg) bus_read_4((sc)->res[0], reg) static int aml8726_iic_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (!ofw_bus_is_compatible(dev, "amlogic,meson6-i2c")) return (ENXIO); device_set_desc(dev, "Amlogic aml8726 I2C"); return (BUS_PROBE_DEFAULT); } static int aml8726_iic_attach(device_t dev) { struct aml8726_iic_softc *sc = device_get_softc(dev); int error; sc->dev = dev; if (bus_alloc_resources(dev, aml8726_iic_spec, sc->res)) { device_printf(dev, "can not allocate resources for device\n"); return (ENXIO); } AML_I2C_LOCK_INIT(sc); sc->iicbb = device_add_child(dev, "iicbb", -1); if (sc->iicbb == NULL) { device_printf(dev, "could not add iicbb\n"); error = ENXIO; goto fail; } error = device_probe_and_attach(sc->iicbb); if (error) { device_printf(dev, "could not attach iicbb\n"); goto fail; } return (0); fail: AML_I2C_LOCK_DESTROY(sc); bus_release_resources(dev, aml8726_iic_spec, sc->res); return (error); } static int aml8726_iic_detach(device_t dev) { struct aml8726_iic_softc *sc = device_get_softc(dev); device_t child; /* * Detach the children before recursively deleting * in case a child has a pointer to a grandchild * which is used by the child's detach routine. * * Remember the child before detaching so we can * delete it (bus_generic_detach indirectly zeroes * sc->child_dev). */ child = sc->iicbb; bus_generic_detach(dev); if (child) device_delete_child(dev, child); AML_I2C_LOCK_DESTROY(sc); bus_release_resources(dev, aml8726_iic_spec, sc->res); return (0); } static void aml8726_iic_child_detached(device_t dev, device_t child) { struct aml8726_iic_softc *sc = device_get_softc(dev); if (child == sc->iicbb) sc->iicbb = NULL; } static int aml8726_iic_callback(device_t dev, int index, caddr_t data) { return (0); } static int aml8726_iic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr) { struct aml8726_iic_softc *sc = device_get_softc(dev); AML_I2C_LOCK(sc); CSR_WRITE_4(sc, AML_I2C_CTRL_REG, (CSR_READ_4(sc, AML_I2C_CTRL_REG) | AML_I2C_MANUAL_SDA_O | AML_I2C_MANUAL_SCL_O | AML_I2C_MANUAL_EN)); AML_I2C_UNLOCK(sc); /* Wait for 10 usec */ DELAY(10); return (IIC_ENOADDR); } static int aml8726_iic_getscl(device_t dev) { struct aml8726_iic_softc *sc = device_get_softc(dev); return (CSR_READ_4(sc, AML_I2C_CTRL_REG) & AML_I2C_MANUAL_SCL_I); } static int aml8726_iic_getsda(device_t dev) { struct aml8726_iic_softc *sc = device_get_softc(dev); return (CSR_READ_4(sc, AML_I2C_CTRL_REG) & AML_I2C_MANUAL_SDA_I); } static void aml8726_iic_setscl(device_t dev, int val) { struct aml8726_iic_softc *sc = device_get_softc(dev); AML_I2C_LOCK(sc); CSR_WRITE_4(sc, AML_I2C_CTRL_REG, ((CSR_READ_4(sc, AML_I2C_CTRL_REG) & ~AML_I2C_MANUAL_SCL_O) | (val ? AML_I2C_MANUAL_SCL_O : 0) | AML_I2C_MANUAL_EN)); AML_I2C_UNLOCK(sc); } static void aml8726_iic_setsda(device_t dev, int val) { struct aml8726_iic_softc *sc = device_get_softc(dev); AML_I2C_LOCK(sc); CSR_WRITE_4(sc, AML_I2C_CTRL_REG, ((CSR_READ_4(sc, AML_I2C_CTRL_REG) & ~AML_I2C_MANUAL_SDA_O) | (val ? AML_I2C_MANUAL_SDA_O : 0) | AML_I2C_MANUAL_EN)); AML_I2C_UNLOCK(sc); } static device_method_t aml8726_iic_methods[] = { /* Device interface */ DEVMETHOD(device_probe, aml8726_iic_probe), DEVMETHOD(device_attach, aml8726_iic_attach), DEVMETHOD(device_detach, aml8726_iic_detach), /* bus interface */ DEVMETHOD(bus_child_detached, aml8726_iic_child_detached), DEVMETHOD(bus_print_child, bus_generic_print_child), DEVMETHOD(bus_driver_added, bus_generic_driver_added), /* IICBB interface */ DEVMETHOD(iicbb_callback, aml8726_iic_callback), DEVMETHOD(iicbb_reset, aml8726_iic_reset), DEVMETHOD(iicbb_getscl, aml8726_iic_getscl), DEVMETHOD(iicbb_getsda, aml8726_iic_getsda), DEVMETHOD(iicbb_setscl, aml8726_iic_setscl), DEVMETHOD(iicbb_setsda, aml8726_iic_setsda), DEVMETHOD_END }; static driver_t aml8726_iic_driver = { "aml8726_iic", aml8726_iic_methods, sizeof(struct aml8726_iic_softc), }; static devclass_t aml8726_iic_devclass; DRIVER_MODULE(aml8726_iic, simplebus, aml8726_iic_driver, aml8726_iic_devclass, 0, 0); DRIVER_MODULE(iicbb, aml8726_iic, iicbb_driver, iicbb_devclass, 0, 0); MODULE_DEPEND(aml8726_iic, iicbb, IICBB_MINVER, IICBB_PREFVER, IICBB_MAXVER); MODULE_VERSION(aml8726_iic, 1);