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285 lines
7.0 KiB
C
285 lines
7.0 KiB
C
/*-
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* Copyright 2013-2015 John Wehle <john@feith.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Amlogic aml8726 I2C driver.
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*
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* Currently this implementation doesn't take full advantage of the hardware.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include "iicbb_if.h"
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struct aml8726_iic_softc {
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device_t dev;
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struct resource *res[1];
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struct mtx mtx;
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device_t iicbb;
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};
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static struct resource_spec aml8726_iic_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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#define AML_I2C_LOCK(sc) mtx_lock(&(sc)->mtx)
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#define AML_I2C_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
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#define AML_I2C_LOCK_INIT(sc) \
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mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev), \
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"i2c", MTX_DEF)
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#define AML_I2C_LOCK_DESTROY(sc) mtx_destroy(&(sc)->mtx);
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#define AML_I2C_CTRL_REG 0
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#define AML_I2C_MANUAL_SDA_I (1 << 26)
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#define AML_I2C_MANUAL_SCL_I (1 << 25)
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#define AML_I2C_MANUAL_SDA_O (1 << 24)
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#define AML_I2C_MANUAL_SCL_O (1 << 23)
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#define AML_I2C_MANUAL_EN (1 << 22)
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#define CSR_WRITE_4(sc, reg, val) bus_write_4((sc)->res[0], reg, (val))
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#define CSR_READ_4(sc, reg) bus_read_4((sc)->res[0], reg)
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static int
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aml8726_iic_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "amlogic,meson6-i2c"))
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return (ENXIO);
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device_set_desc(dev, "Amlogic aml8726 I2C");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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aml8726_iic_attach(device_t dev)
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{
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struct aml8726_iic_softc *sc = device_get_softc(dev);
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int error;
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sc->dev = dev;
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if (bus_alloc_resources(dev, aml8726_iic_spec, sc->res)) {
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device_printf(dev, "can not allocate resources for device\n");
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return (ENXIO);
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}
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AML_I2C_LOCK_INIT(sc);
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sc->iicbb = device_add_child(dev, "iicbb", -1);
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if (sc->iicbb == NULL) {
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device_printf(dev, "could not add iicbb\n");
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error = ENXIO;
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goto fail;
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}
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error = device_probe_and_attach(sc->iicbb);
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if (error) {
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device_printf(dev, "could not attach iicbb\n");
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goto fail;
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}
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return (0);
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fail:
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AML_I2C_LOCK_DESTROY(sc);
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bus_release_resources(dev, aml8726_iic_spec, sc->res);
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return (error);
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}
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static int
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aml8726_iic_detach(device_t dev)
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{
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struct aml8726_iic_softc *sc = device_get_softc(dev);
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device_t child;
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/*
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* Detach the children before recursively deleting
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* in case a child has a pointer to a grandchild
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* which is used by the child's detach routine.
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*
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* Remember the child before detaching so we can
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* delete it (bus_generic_detach indirectly zeroes
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* sc->child_dev).
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*/
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child = sc->iicbb;
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bus_generic_detach(dev);
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if (child)
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device_delete_child(dev, child);
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AML_I2C_LOCK_DESTROY(sc);
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bus_release_resources(dev, aml8726_iic_spec, sc->res);
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return (0);
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}
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static void
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aml8726_iic_child_detached(device_t dev, device_t child)
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{
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struct aml8726_iic_softc *sc = device_get_softc(dev);
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if (child == sc->iicbb)
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sc->iicbb = NULL;
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}
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static int
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aml8726_iic_callback(device_t dev, int index, caddr_t data)
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{
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return (0);
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}
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static int
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aml8726_iic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
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{
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struct aml8726_iic_softc *sc = device_get_softc(dev);
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AML_I2C_LOCK(sc);
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CSR_WRITE_4(sc, AML_I2C_CTRL_REG,
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(CSR_READ_4(sc, AML_I2C_CTRL_REG) | AML_I2C_MANUAL_SDA_O |
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AML_I2C_MANUAL_SCL_O | AML_I2C_MANUAL_EN));
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AML_I2C_UNLOCK(sc);
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/* Wait for 10 usec */
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DELAY(10);
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return (IIC_ENOADDR);
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}
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static int
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aml8726_iic_getscl(device_t dev)
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{
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struct aml8726_iic_softc *sc = device_get_softc(dev);
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return (CSR_READ_4(sc, AML_I2C_CTRL_REG) & AML_I2C_MANUAL_SCL_I);
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}
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static int
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aml8726_iic_getsda(device_t dev)
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{
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struct aml8726_iic_softc *sc = device_get_softc(dev);
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return (CSR_READ_4(sc, AML_I2C_CTRL_REG) & AML_I2C_MANUAL_SDA_I);
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}
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static void
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aml8726_iic_setscl(device_t dev, int val)
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{
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struct aml8726_iic_softc *sc = device_get_softc(dev);
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AML_I2C_LOCK(sc);
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CSR_WRITE_4(sc, AML_I2C_CTRL_REG, ((CSR_READ_4(sc, AML_I2C_CTRL_REG) &
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~AML_I2C_MANUAL_SCL_O) | (val ? AML_I2C_MANUAL_SCL_O : 0) |
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AML_I2C_MANUAL_EN));
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AML_I2C_UNLOCK(sc);
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}
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static void
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aml8726_iic_setsda(device_t dev, int val)
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{
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struct aml8726_iic_softc *sc = device_get_softc(dev);
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AML_I2C_LOCK(sc);
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CSR_WRITE_4(sc, AML_I2C_CTRL_REG, ((CSR_READ_4(sc, AML_I2C_CTRL_REG) &
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~AML_I2C_MANUAL_SDA_O) | (val ? AML_I2C_MANUAL_SDA_O : 0) |
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AML_I2C_MANUAL_EN));
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AML_I2C_UNLOCK(sc);
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}
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static device_method_t aml8726_iic_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, aml8726_iic_probe),
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DEVMETHOD(device_attach, aml8726_iic_attach),
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DEVMETHOD(device_detach, aml8726_iic_detach),
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/* bus interface */
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DEVMETHOD(bus_child_detached, aml8726_iic_child_detached),
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DEVMETHOD(bus_print_child, bus_generic_print_child),
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DEVMETHOD(bus_driver_added, bus_generic_driver_added),
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/* IICBB interface */
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DEVMETHOD(iicbb_callback, aml8726_iic_callback),
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DEVMETHOD(iicbb_reset, aml8726_iic_reset),
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DEVMETHOD(iicbb_getscl, aml8726_iic_getscl),
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DEVMETHOD(iicbb_getsda, aml8726_iic_getsda),
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DEVMETHOD(iicbb_setscl, aml8726_iic_setscl),
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DEVMETHOD(iicbb_setsda, aml8726_iic_setsda),
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DEVMETHOD_END
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};
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static driver_t aml8726_iic_driver = {
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"aml8726_iic",
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aml8726_iic_methods,
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sizeof(struct aml8726_iic_softc),
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};
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static devclass_t aml8726_iic_devclass;
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DRIVER_MODULE(aml8726_iic, simplebus, aml8726_iic_driver,
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aml8726_iic_devclass, 0, 0);
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DRIVER_MODULE(iicbb, aml8726_iic, iicbb_driver, iicbb_devclass, 0, 0);
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MODULE_DEPEND(aml8726_iic, iicbb, IICBB_MINVER, IICBB_PREFVER, IICBB_MAXVER);
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MODULE_VERSION(aml8726_iic, 1);
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