vpp - Vector Packet Processing

Age	Commit message (Collapse)	Author	Files	Lines
2017-11-09	BIER	Neale Ranns	1	-0/+390
	- see draft-ietf-bier-mpls-encapsulation-10 - midpoint, head and tail functions - supported payload protocols; IPv4 and IPv6 only. Change-Id: I59d7363bb6fdfdce8e4016a68a9c8f5a5e5791cb Signed-off-by: Neale Ranns <nranns@cisco.com>

/* * 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); } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */