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-rw-r--r--vlib/Makefile.am2
-rw-r--r--vlib/vlib/i2c.c222
-rw-r--r--vlib/vlib/i2c.h57
-rw-r--r--vlib/vlib/physmem.h3
-rw-r--r--vlib/vlib/unix/physmem.c1
-rw-r--r--vlib/vlib/unix/unix.h7
6 files changed, 292 insertions, 0 deletions
diff --git a/vlib/Makefile.am b/vlib/Makefile.am
index 981c2befd5e..274756719c1 100644
--- a/vlib/Makefile.am
+++ b/vlib/Makefile.am
@@ -31,6 +31,7 @@ libvlib_la_SOURCES = \
vlib/counter.c \
vlib/error.c \
vlib/format.c \
+ vlib/i2c.c \
vlib/init.c \
vlib/main.c \
vlib/mc.c \
@@ -61,6 +62,7 @@ nobase_include_HEADERS = \
vlib/error.h \
vlib/format_funcs.h \
vlib/global_funcs.h \
+ vlib/i2c.h \
vlib/init.h \
vlib/main.h \
vlib/mc.h \
diff --git a/vlib/vlib/i2c.c b/vlib/vlib/i2c.c
new file mode 100644
index 00000000000..83a702edbd6
--- /dev/null
+++ b/vlib/vlib/i2c.c
@@ -0,0 +1,222 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vlib/vlib.h>
+#include <vlib/i2c.h>
+
+static inline void
+i2c_delay (i2c_bus_t * b, f64 timeout)
+{
+ vlib_main_t * vm = vlib_get_main();
+ vlib_time_wait (vm, timeout);
+}
+
+static void
+i2c_wait_for_scl (i2c_bus_t * b)
+{
+ f64 t = 0;
+
+ while (t < b->hold_time)
+ {
+ int sda, scl;
+ i2c_delay(b, b->rise_fall_time);
+ b->get_bits (b, &scl, &sda);
+
+ if (scl)
+ return;
+
+ t += b->rise_fall_time;
+ }
+ b->timeout = 1;
+}
+
+static void
+i2c_start (i2c_bus_t * b)
+{
+ b->timeout = 0;
+
+ b->put_bits (b, 1, 1);
+ i2c_wait_for_scl (b);
+
+ if (vlib_i2c_bus_timed_out (b))
+ return;
+
+ b->put_bits (b, 1, 0);
+ i2c_delay (b, b->hold_time);
+ b->put_bits (b, 0, 0);
+ i2c_delay (b, b->hold_time);
+}
+
+static void
+i2c_stop (i2c_bus_t * b)
+{
+ b->put_bits (b, 0, 0);
+ i2c_delay (b, b->rise_fall_time);
+
+ b->put_bits (b, 1, 0);
+ i2c_delay (b, b->hold_time);
+
+ b->put_bits (b, 1, 1);
+ i2c_delay (b, b->hold_time);
+}
+
+static void
+i2c_write_bit (i2c_bus_t * b, int sda)
+{
+ b->put_bits (b, 0, sda);
+ i2c_delay (b, b->rise_fall_time);
+
+ b->put_bits (b, 1, sda);
+ i2c_wait_for_scl (b);
+ i2c_delay (b, b->hold_time);
+
+ b->put_bits (b, 0, sda);
+ i2c_delay (b, b->rise_fall_time);
+}
+
+static void
+i2c_read_bit (i2c_bus_t * b, int * sda)
+{
+ int scl;
+
+ b->put_bits (b, 1, 1);
+ i2c_wait_for_scl (b);
+ i2c_delay (b, b->hold_time);
+
+ b->get_bits (b, &scl, sda);
+
+ b->put_bits (b, 0, 1);
+ i2c_delay (b, b->rise_fall_time);
+}
+
+static void
+i2c_write_byte (i2c_bus_t * b, u8 data)
+{
+ int i, sda;
+
+ for (i = 7; i >= 0; i--)
+ {
+ i2c_write_bit (b, (data >> i) & 1);
+ if (b->timeout)
+ return;
+ }
+
+ b->put_bits (b, 0, 1);
+ i2c_delay (b, b->rise_fall_time);
+
+ i2c_read_bit(b, &sda);
+
+ if (sda)
+ b->timeout = 1;
+}
+
+
+static void
+i2c_read_byte (i2c_bus_t * b, u8 * data, int ack)
+{
+ int i, sda;
+
+ *data = 0;
+
+ b->put_bits (b, 0, 1);
+ i2c_delay (b, b->rise_fall_time);
+
+ for (i = 7; i >= 0; i--)
+ {
+ i2c_read_bit (b, &sda);
+ if (b->timeout)
+ return;
+
+ *data |= (sda != 0) << i;
+ }
+
+ i2c_write_bit (b, ack == 0);
+}
+
+
+void
+vlib_i2c_init (i2c_bus_t * b)
+{
+ f64 tick;
+ if (!b->clock)
+ b->clock = 400000;
+
+ tick = 1.0 / b->clock;
+
+ /* Spend 40% of time in low and high states */
+ if (!b->hold_time)
+ b->hold_time = 0.4 * tick;
+
+ /* Spend 10% of time waiting for rise and fall */
+ if (!b->rise_fall_time)
+ b->rise_fall_time = 0.1 * tick;
+}
+
+void
+vlib_i2c_xfer (i2c_bus_t * bus, i2c_msg_t * msgs)
+{
+ i2c_msg_t *msg;
+ int i;
+
+ vec_foreach (msg, msgs)
+ {
+ i2c_start (bus);
+ i2c_write_byte (bus, (msg->addr << 1) + (msg->flags == I2C_MSG_FLAG_READ));
+
+ if (msg->flags & I2C_MSG_FLAG_READ)
+ for (i=0; i< msg->len; i++)
+ {
+ i2c_read_byte (bus, &msg->buffer[i], /* ack */ i + 1 != msg->len);
+ if (bus->timeout)
+ goto done;
+ }
+
+ else
+ for (i=0; i< msg->len; i++)
+ {
+ i2c_write_byte (bus, msg->buffer[i]);
+ if (bus->timeout)
+ goto done;
+ }
+ }
+
+done:
+ i2c_stop(bus);
+}
+
+void
+vlib_i2c_read_eeprom (i2c_bus_t * bus, u8 i2c_addr, u16 start_addr, u16 length, u8 * data)
+{
+ i2c_msg_t * msg = 0;
+ u8 start_address[1];
+
+ vec_validate (msg, 1);
+
+ start_address[0] = start_addr;
+ msg[0].addr = i2c_addr;
+ msg[0].flags = I2C_MSG_FLAG_WRITE;
+ msg[0].buffer = (u8 *) &start_address;
+ msg[0].len = 1;
+
+ msg[1].addr = i2c_addr;
+ msg[1].flags = I2C_MSG_FLAG_READ;
+ msg[1].buffer = data;
+ msg[1].len = length;
+
+ vlib_i2c_xfer(bus, msg);
+
+ vec_free (msg);
+}
+
diff --git a/vlib/vlib/i2c.h b/vlib/vlib/i2c.h
new file mode 100644
index 00000000000..451957d8513
--- /dev/null
+++ b/vlib/vlib/i2c.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef included_vlib_i2c_h
+#define included_vlib_i2c_h
+
+#include <vppinfra/types.h>
+
+
+#define I2C_MSG_FLAG_WRITE 0
+#define I2C_MSG_FLAG_READ 1
+
+typedef struct {
+ u8 addr;
+ u8 flags;
+ u16 len;
+ u8 * buffer;
+} i2c_msg_t;
+
+typedef struct i2c_bus_t {
+ void (* put_bits) (struct i2c_bus_t * b, int scl, int sda);
+ void (* get_bits) (struct i2c_bus_t * b, int *scl, int *sda);
+
+ int timeout;
+ u32 clock;
+ f64 hold_time;
+ f64 rise_fall_time;
+
+ /* Private data */
+ uword private_data;
+
+} i2c_bus_t;
+
+void vlib_i2c_init (i2c_bus_t * bus);
+void vlib_i2c_xfer (i2c_bus_t * bus, i2c_msg_t * msgs);
+void vlib_i2c_read_eeprom (i2c_bus_t * bus, u8 i2c_addr, u16 start_addr, u16 length, u8 * data);
+
+static inline int
+vlib_i2c_bus_timed_out(i2c_bus_t * bus)
+{
+ return bus->timeout;
+}
+
+#endif /* included_vlib_i2c_h */
+
diff --git a/vlib/vlib/physmem.h b/vlib/vlib/physmem.h
index 6e70291c1d9..6f75a0f3662 100644
--- a/vlib/vlib/physmem.h
+++ b/vlib/vlib/physmem.h
@@ -53,6 +53,9 @@ typedef struct {
uword page_mask;
u64 * page_table;
+
+ /* is fake physmem */
+ u8 is_fake;
} vlib_physmem_main_t;
always_inline u64
diff --git a/vlib/vlib/unix/physmem.c b/vlib/vlib/unix/physmem.c
index 67c2233929d..d3155e0c7c9 100644
--- a/vlib/vlib/unix/physmem.c
+++ b/vlib/vlib/unix/physmem.c
@@ -245,6 +245,7 @@ clib_error_t * unix_physmem_init (vlib_main_t * vm, int physical_memory_required
vpm->virtual.start = pointer_to_uword (pm->mem);
vpm->virtual.size = pm->mem_size;
vpm->virtual.end = vpm->virtual.start + vpm->virtual.size;
+ vpm->is_fake = 1;
fformat(stderr, "%s: use fake dma pages\n", __FUNCTION__);
diff --git a/vlib/vlib/unix/unix.h b/vlib/vlib/unix/unix.h
index 75d5df04e56..6c1f985aaba 100644
--- a/vlib/vlib/unix/unix.h
+++ b/vlib/vlib/unix/unix.h
@@ -180,6 +180,13 @@ int vlib_unix_main (int argc, char * argv[]);
clib_error_t * unix_physmem_init (vlib_main_t * vm,
int fail_if_physical_memory_not_present);
+static inline int
+unix_physmem_is_fake (vlib_main_t * vm)
+{
+ vlib_physmem_main_t * vpm = &vm->physmem_main;
+ return vpm->is_fake;
+}
+
/* Set prompt for CLI. */
void vlib_unix_cli_set_prompt (char * prompt);