[PATCH 3/5] Add rtems i2c adaptation layer

Vijay Kumar Banerjee vijaykumar9597 at gmail.com
Sat Jun 1 19:20:12 UTC 2019


---
 libbsd.py                |   1 +
 rtemsbsd/i2c/rtems-i2c.c | 218 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 219 insertions(+)
 create mode 100644 rtemsbsd/i2c/rtems-i2c.c

diff --git a/libbsd.py b/libbsd.py
index a25d3a8a..6e8ff987 100644
--- a/libbsd.py
+++ b/libbsd.py
@@ -771,6 +771,7 @@ class iic(builder.Module):
         self.addRTEMSSourceFiles(
             [
                 'local/iicbus_if.c',
+                'i2c/rtems-i2c.c',
             ],
             mm.generator['source']()
         )
diff --git a/rtemsbsd/i2c/rtems-i2c.c b/rtemsbsd/i2c/rtems-i2c.c
new file mode 100644
index 00000000..5189e5fe
--- /dev/null
+++ b/rtemsbsd/i2c/rtems-i2c.c
@@ -0,0 +1,218 @@
+/*
+ * 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;
+	int fd;
+	int mem_rid;
+	int irq_rid;
+};
+
+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);
+	}
+	else{
+		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);
+
+	OF_prop_free(sc->path);
+
+	if (sc->sc_iicbus && (error = device_delete_child(dev, sc->sc_iicbus)) != 0)
+		return (error);
+
+	if ((error = bus_generic_detach(sc->dev)) != 0) {
+		device_printf(sc->dev, "cannot detach child devices\n");
+		return (error);
+	}
+
+
+	return (0);
+}
+
+static int
+rtems_i2c_transfer(device_t dev, struct iic_msg *msgs, u_int num)
+{
+	i2c_msg *messages;
+	int err;
+	char *addr;
+	struct i2c_softc *sc;
+	struct i2c_rdwr_ioctl_data ioctl_data;
+
+	sc = device_get_softc(dev);
+
+	/* Open /dev/iic0 */
+	sc->fd = open(sc->path, O_RDWR);
+	if (sc->fd < 0) {
+		device_printf(sc->dev, "%s\n", strerror(errno));
+		return errno;
+	}
+
+	/* cast iic_msg to i2c_msg */
+	messages = (i2c_msg *) msgs;
+	ioctl_data.msgs = messages;
+	ioctl_data.nmsgs = num;
+
+	/* IOCTL call to write */
+	err = ioctl(sc->fd, I2C_RDWR, &ioctl_data);
+	if (err < 0){
+		device_printf(sc->dev, "%s\n", strerror(errno));
+		close(sc->fd);
+		return errno;
+	}
+
+	/* Close the device */
+	close(sc->fd);
+
+	return (0);
+}
+
+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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