diff options
Diffstat (limited to 'firmware/zpu/lib/pkt_ctrl.c')
-rw-r--r-- | firmware/zpu/lib/pkt_ctrl.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/firmware/zpu/lib/pkt_ctrl.c b/firmware/zpu/lib/pkt_ctrl.c new file mode 100644 index 000000000..2bbe2f843 --- /dev/null +++ b/firmware/zpu/lib/pkt_ctrl.c @@ -0,0 +1,100 @@ +/* + * 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; +} |