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/*
* Copyright 2010-2011 Ettus Research LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pkt_ctrl.h"
#include "memory_map.h"
#include <nonstdio.h>
//status signals from WB into PR
#define CPU_STAT_RD_DONE (1 << 0)
#define CPU_STAT_RD_EROR (1 << 1)
#define CPU_STAT_RD_IDLE (1 << 2)
//status signals from PR into WB
#define CPU_STAT_WR_DONE (1 << 4)
#define CPU_STAT_WR_EROR (1 << 5)
#define CPU_STAT_WR_IDLE (1 << 6)
//control signals from WB into PR
#define CPU_CTRL_RD_CLEAR (1 << 0)
#define CPU_CTRL_RD_START (1 << 1)
//control signals from PR into WB
#define CPU_CTRL_WR_CLEAR (1 << 2)
#define CPU_CTRL_WR_START (1 << 3)
void pkt_ctrl_program_inspector(
const struct ip_addr *ip_addr, uint16_t data_port
){
router_ctrl->ip_addr = ip_addr->addr;
router_ctrl->data_ports = data_port;
}
void pkt_ctrl_set_routing_mode(pkt_ctrl_routing_mode_t mode){
//About to change the mode; ensure that we are accepting packets.
//The plumbing will not switch if it cannot pass an end of packet.
pkt_ctrl_release_incoming_buffer();
//Change the mode; this switches the valves and crossbars.
router_ctrl->mode_ctrl = mode;
}
static inline void cpu_stat_wait_for(int bm){
while((router_status->status & bm) == 0){
/* NOP */
}
}
void *pkt_ctrl_claim_incoming_buffer(size_t *num_lines){
uint32_t status = router_status->status;
//if done: clear the read and return the buffer
if (status & CPU_STAT_RD_DONE){
*num_lines = (router_status->status >> 16) & 0xffff;
return ((uint32_t *) ROUTER_RAM_BASE);
}
//if error: drop the packet and start a new read
if (status & CPU_STAT_RD_EROR){
putstr("E");
pkt_ctrl_release_incoming_buffer();
}
//otherwise null for nothing ready
return NULL;
}
void pkt_ctrl_release_incoming_buffer(void){
//clear, wait for idle, and start a new read
router_ctrl->iface_ctrl = CPU_CTRL_RD_CLEAR;
cpu_stat_wait_for(CPU_STAT_RD_IDLE);
router_ctrl->iface_ctrl = CPU_CTRL_RD_START;
}
void *pkt_ctrl_claim_outgoing_buffer(void){
//wait for idle and return the buffer
cpu_stat_wait_for(CPU_STAT_WR_IDLE);
return ((uint32_t *) ROUTER_RAM_BASE);
}
void pkt_ctrl_commit_outgoing_buffer(size_t num_lines){
//start a new write with the given length
router_ctrl->iface_ctrl = ((num_lines & 0xffff) << 16) | CPU_CTRL_WR_START;
//wait for the write to become done
cpu_stat_wait_for(CPU_STAT_WR_DONE);
router_ctrl->iface_ctrl = CPU_CTRL_WR_CLEAR;
}
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