[PATCH v4 3/5] Add rtems i2c adaptation layer
Vijay Kumar Banerjee
vijaykumar9597 at gmail.com
Tue Jun 25 07:13:41 UTC 2019
---
libbsd.py | 1 +
rtemsbsd/sys/dev/iicbus/rtems-i2c.c | 231 ++++++++++++++++++++++++++++
2 files changed, 232 insertions(+)
create mode 100644 rtemsbsd/sys/dev/iicbus/rtems-i2c.c
diff --git a/libbsd.py b/libbsd.py
index a25d3a8a..6ad046b8 100644
--- a/libbsd.py
+++ b/libbsd.py
@@ -771,6 +771,7 @@ class iic(builder.Module):
self.addRTEMSSourceFiles(
[
'local/iicbus_if.c',
+ 'sys/dev/iicbus/rtems-i2c.c',
],
mm.generator['source']()
)
diff --git a/rtemsbsd/sys/dev/iicbus/rtems-i2c.c b/rtemsbsd/sys/dev/iicbus/rtems-i2c.c
new file mode 100644
index 00000000..b965f248
--- /dev/null
+++ b/rtemsbsd/sys/dev/iicbus/rtems-i2c.c
@@ -0,0 +1,231 @@
+/*
+ * Copyright (c) 2019 Vijay Kumar Banerjee <vijaykumar9597 at gmail.com>.
+ * 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.
+ */
+
+#include <machine/rtems-bsd-kernel-space.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include <sys/module.h>
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/errno.h>
+#include <sys/bus.h>
+
+#include <dev/iicbus/iicbus.h>
+#include <dev/iicbus/iic.h>
+#include <dev/iicbus/iiconf.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/ofw/openfirm.h>
+
+#include <rtems/bsd/local/iicbus_if.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+
+typedef struct i2c_msg i2c_msg;
+
+struct i2c_softc {
+ device_t dev;
+ device_t sc_iicbus;
+ char *path;
+};
+
+static int
+rtems_i2c_probe(device_t dev)
+{
+ if (!ofw_bus_status_okay(dev)) {
+ return (ENXIO);
+ }
+ if (!ofw_bus_is_compatible(dev, "rtems,bsp-i2c")){
+ return (ENXIO);
+ }
+
+ device_set_desc(dev, "RTEMS libbsd I2C");
+ return (BUS_PROBE_SPECIFIC);
+}
+
+static int
+rtems_i2c_attach(device_t dev)
+{
+ phandle_t node;
+ ssize_t compatlen;
+ char *compat;
+ char *curstr;
+ struct i2c_softc *sc;
+ int len;
+
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+ node = ofw_bus_get_node(sc->dev);
+
+ len = OF_getprop_alloc(node, "rtems,i2c-path", &sc->path);
+ if (len == -1){
+ device_printf(sc->dev, "Path not found in Device Tree");
+ OF_prop_free(sc->path);
+ return (ENXIO);
+ }
+
+ if ((sc->sc_iicbus = device_add_child(sc->dev, "iicbus", -1)) == NULL) {
+ device_printf(sc->dev, "could not allocate iicbus instance\n");
+ OF_prop_free(sc->path);
+ return (ENXIO);
+ }
+ config_intrhook_oneshot((ich_func_t)bus_generic_attach, sc->dev);
+
+ return (0);
+}
+
+static int
+rtems_i2c_detach(device_t dev)
+{
+ struct i2c_softc *sc;
+ int error;
+
+ sc = device_get_softc(dev);
+
+ if ((error = bus_generic_detach(sc->dev)) != 0) {
+ device_printf(sc->dev, "cannot detach child devices\n");
+ return (error);
+ }
+
+ if (sc->sc_iicbus && (error = device_delete_child(dev, sc->sc_iicbus)) != 0)
+ return (error);
+
+ OF_prop_free(sc->path);
+
+ return (0);
+}
+
+static int
+rtems_i2c_transfer(device_t dev, struct iic_msg *msgs, u_int num)
+{
+ i2c_msg *messages;
+ int err = 0;
+ int fd;
+ char *addr;
+ struct i2c_softc *sc;
+ struct i2c_rdwr_ioctl_data ioctl_data;
+ uint16_t newflags = 0;
+
+ sc = device_get_softc(dev);
+
+ /* Open /dev/iic0 */
+ fd = open(sc->path, O_RDWR);
+ if (fd < 0) {
+ device_printf(sc->dev, "RTEMS I2C device could not be opened ");
+ return errno;
+ }
+
+ /* cast iic_msg to i2c_msg */
+ messages = (i2c_msg *) msgs;
+
+ for(int i = 0; i < num; ++i){
+ messages[i].addr = messages[i].addr >> 1;
+ if (messages[i].flags & IIC_M_RD){
+ newflags |= I2C_M_RD;
+ }
+ else if ((messages[i].flags & IIC_M_NOSTOP) == 0){
+ newflags |= I2C_M_STOP;
+ }
+ else if (messages[i].flags & IIC_M_NOSTART){
+ newflags |= I2C_M_NOSTART;
+ }
+ else
+ newflags = 0;
+ messages[i].flags = newflags;
+ }
+
+ ioctl_data.msgs = messages;
+ ioctl_data.nmsgs = num;
+
+ /* IOCTL call to write */
+ err = ioctl(fd, I2C_RDWR, &ioctl_data);
+ if (err == -1) {
+ err = errno;
+ }
+
+ /* Close the device */
+ close(fd);
+
+ return (err);
+}
+
+static int
+rtems_i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
+{
+ return (0);
+}
+
+static phandle_t
+rtems_i2c_get_node(device_t bus, device_t dev)
+{
+
+ /* Share controller node with iibus device. */
+ return (ofw_bus_get_node(bus));
+}
+
+static device_method_t rtems_i2c_methods[] = {
+ /* Device Interface */
+ DEVMETHOD(device_probe, rtems_i2c_probe),
+ DEVMETHOD(device_attach, rtems_i2c_attach),
+ DEVMETHOD(device_detach, rtems_i2c_detach),
+
+ /* Bus interface */
+ DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
+ DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
+ DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
+ DEVMETHOD(bus_release_resource, bus_generic_release_resource),
+ DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
+ DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
+ DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
+ DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
+ DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
+
+ /* OFW methods */
+ DEVMETHOD(ofw_bus_get_node, rtems_i2c_get_node),
+
+ /* iicbus interface */
+ DEVMETHOD(iicbus_callback, iicbus_null_callback),
+ DEVMETHOD(iicbus_reset, rtems_i2c_reset),
+ DEVMETHOD(iicbus_transfer, rtems_i2c_transfer),
+
+ DEVMETHOD_END
+};
+
+static driver_t rtems_i2c_driver = {
+ "rtems_i2c",
+ rtems_i2c_methods,
+ sizeof(struct i2c_softc),
+};
+
+static devclass_t rtems_i2c_devclass;
+DRIVER_MODULE(rtems_i2c, simplebus, rtems_i2c_driver, rtems_i2c_devclass, 0, 0);
+DRIVER_MODULE(iicbus, rtems_i2c, iicbus_driver, iicbus_devclass, 0, 0);
+DRIVER_MODULE(ofw_iicbus, rtems_i2c, ofw_iicbus_driver, ofw_iicbus_devclass, 0, 0);
--
2.20.1
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