mirror of
https://git.rtems.org/rtems-libbsd/
synced 2025-06-28 22:14:58 +08:00
Add rtems i2c adaptation layer
This commit is contained in:
Vijay Kumar Banerjee
Christian Mauderer
parent
4e1325a338
commit
7ab9e2ad53
@ -771,6 +771,7 @@ class iic(builder.Module):
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self.addRTEMSSourceFiles(
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[
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'local/iicbus_if.c',
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'sys/dev/iicbus/rtems-i2c.c',
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],
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mm.generator['source']()
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)
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231
rtemsbsd/sys/dev/iicbus/rtems-i2c.c
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231
rtemsbsd/sys/dev/iicbus/rtems-i2c.c
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@ -0,0 +1,231 @@
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/*
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* Copyright (c) 2019 Vijay Kumar Banerjee <vijaykumar9597@gmail.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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#include <machine/rtems-bsd-kernel-space.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/module.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/errno.h>
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#include <sys/bus.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iic.h>
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#include <dev/iicbus/iiconf.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/ofw/openfirm.h>
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#include <rtems/bsd/local/iicbus_if.h>
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#include <linux/i2c.h>
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#include <linux/i2c-dev.h>
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typedef struct i2c_msg i2c_msg;
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struct i2c_softc {
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device_t dev;
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device_t sc_iicbus;
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char *path;
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};
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static int
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rtems_i2c_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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}
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if (!ofw_bus_is_compatible(dev, "rtems,bsp-i2c")){
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return (ENXIO);
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}
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device_set_desc(dev, "RTEMS libbsd I2C");
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return (BUS_PROBE_SPECIFIC);
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}
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static int
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rtems_i2c_attach(device_t dev)
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{
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phandle_t node;
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ssize_t compatlen;
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char *compat;
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char *curstr;
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struct i2c_softc *sc;
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int len;
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sc = device_get_softc(dev);
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sc->dev = dev;
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node = ofw_bus_get_node(sc->dev);
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len = OF_getprop_alloc(node, "rtems,i2c-path", &sc->path);
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if (len == -1){
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device_printf(sc->dev, "Path not found in Device Tree");
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OF_prop_free(sc->path);
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return (ENXIO);
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}
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if ((sc->sc_iicbus = device_add_child(sc->dev, "iicbus", -1)) == NULL) {
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device_printf(sc->dev, "could not allocate iicbus instance\n");
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OF_prop_free(sc->path);
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return (ENXIO);
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}
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config_intrhook_oneshot((ich_func_t)bus_generic_attach, sc->dev);
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return (0);
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}
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static int
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rtems_i2c_detach(device_t dev)
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{
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struct i2c_softc *sc;
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int error;
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sc = device_get_softc(dev);
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if ((error = bus_generic_detach(sc->dev)) != 0) {
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device_printf(sc->dev, "cannot detach child devices\n");
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return (error);
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}
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if (sc->sc_iicbus && (error = device_delete_child(dev, sc->sc_iicbus)) != 0)
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return (error);
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OF_prop_free(sc->path);
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return (0);
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}
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static int
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rtems_i2c_transfer(device_t dev, struct iic_msg *msgs, u_int num)
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{
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i2c_msg *messages;
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int err = 0;
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int fd;
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char *addr;
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struct i2c_softc *sc;
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struct i2c_rdwr_ioctl_data ioctl_data;
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uint16_t newflags = 0;
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sc = device_get_softc(dev);
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/* Open /dev/iic0 */
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fd = open(sc->path, O_RDWR);
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if (fd < 0) {
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device_printf(sc->dev, "RTEMS I2C device could not be opened ");
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return errno;
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}
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/* cast iic_msg to i2c_msg */
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messages = (i2c_msg *) msgs;
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for(int i = 0; i < num; ++i){
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messages[i].addr = messages[i].addr >> 1;
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if (messages[i].flags & IIC_M_RD){
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newflags |= I2C_M_RD;
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}
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else if ((messages[i].flags & IIC_M_NOSTOP) == 0){
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newflags |= I2C_M_STOP;
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}
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else if (messages[i].flags & IIC_M_NOSTART){
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newflags |= I2C_M_NOSTART;
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}
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else
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newflags = 0;
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messages[i].flags = newflags;
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}
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ioctl_data.msgs = messages;
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ioctl_data.nmsgs = num;
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/* IOCTL call to write */
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err = ioctl(fd, I2C_RDWR, &ioctl_data);
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if (err == -1) {
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err = errno;
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}
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/* Close the device */
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close(fd);
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return (err);
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}
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static int
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rtems_i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
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{
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return (0);
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}
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static phandle_t
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rtems_i2c_get_node(device_t bus, device_t dev)
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{
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/* Share controller node with iibus device. */
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return (ofw_bus_get_node(bus));
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}
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static device_method_t rtems_i2c_methods[] = {
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/* Device Interface */
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DEVMETHOD(device_probe, rtems_i2c_probe),
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DEVMETHOD(device_attach, rtems_i2c_attach),
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DEVMETHOD(device_detach, rtems_i2c_detach),
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/* Bus interface */
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DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
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DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
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DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
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DEVMETHOD(bus_release_resource, bus_generic_release_resource),
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DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
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DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
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DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
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DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
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DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
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/* OFW methods */
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DEVMETHOD(ofw_bus_get_node, rtems_i2c_get_node),
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/* iicbus interface */
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DEVMETHOD(iicbus_callback, iicbus_null_callback),
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DEVMETHOD(iicbus_reset, rtems_i2c_reset),
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DEVMETHOD(iicbus_transfer, rtems_i2c_transfer),
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DEVMETHOD_END
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};
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static driver_t rtems_i2c_driver = {
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"rtems_i2c",
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rtems_i2c_methods,
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sizeof(struct i2c_softc),
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};
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static devclass_t rtems_i2c_devclass;
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DRIVER_MODULE(rtems_i2c, simplebus, rtems_i2c_driver, rtems_i2c_devclass, 0, 0);
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DRIVER_MODULE(iicbus, rtems_i2c, iicbus_driver, iicbus_devclass, 0, 0);
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DRIVER_MODULE(ofw_iicbus, rtems_i2c, ofw_iicbus_driver, ofw_iicbus_devclass, 0, 0);
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