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/* libhw/w5500.h - <libhw/generic/net.h> implementation for the WIZnet W5500 chip
*
* Copyright (C) 2024-2025 Luke T. Shumaker <lukeshu@lukeshu.com>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#ifndef _LIBHW_W5500_H_
#define _LIBHW_W5500_H_
#include <pico/binary_info.h> /* for bi_* */
#include <libcr_ipc/chan.h>
#include <libcr_ipc/mutex.h>
#include <libcr_ipc/sema.h>
#include <libmisc/private.h>
#include <libhw/generic/net.h>
#include <libhw/generic/spi.h>
CR_CHAN_DECLARE(_w5500_sockintr_ch, uint8_t)
struct _w5500_socket {
BEGIN_PRIVATE(LIBHW_W5500_H);
/* const-after-init */
uint8_t socknum;
/* mutable */
struct _w5500_socket *next_free;
enum {
W5500_MODE_NONE = 0,
W5500_MODE_TCP,
W5500_MODE_UDP,
} mode;
uint16_t port; /* MODE_{TCP,UDP} */
uint64_t read_deadline_ns; /* MODE_{TCP,UDP} */
cr_sema_t listen_sema; /* MODE_TCP */
cr_sema_t read_sema; /* MODE_{TCP,UDP} */
_w5500_sockintr_ch_t write_ch; /* MODE_{TCP,UDP} */
bool list_open, read_open, write_open; /* MODE_TCP */
END_PRIVATE(LIBHW_W5500_H);
};
LO_IMPLEMENTATION_H(io_closer, struct _w5500_socket, w5500_tcplist);
LO_IMPLEMENTATION_H(net_stream_listener, struct _w5500_socket, w5500_tcplist);
LO_IMPLEMENTATION_H(io_reader, struct _w5500_socket, w5500_tcp);
LO_IMPLEMENTATION_H(io_writer, struct _w5500_socket, w5500_tcp);
LO_IMPLEMENTATION_H(io_readwriter, struct _w5500_socket, w5500_tcp);
LO_IMPLEMENTATION_H(io_closer, struct _w5500_socket, w5500_tcp);
LO_IMPLEMENTATION_H(io_bidi_closer, struct _w5500_socket, w5500_tcp);
LO_IMPLEMENTATION_H(net_stream_conn, struct _w5500_socket, w5500_tcp);
LO_IMPLEMENTATION_H(io_closer, struct _w5500_socket, w5500_udp);
LO_IMPLEMENTATION_H(net_packet_conn, struct _w5500_socket, w5500_udp);
struct w5500 {
BEGIN_PRIVATE(LIBHW_W5500_H);
/* const-after-init */
lo_interface spi spidev;
uint pin_intr;
uint pin_reset;
struct net_eth_addr hwaddr;
/* mutable */
uint16_t next_local_port;
struct _w5500_socket sockets[8];
struct _w5500_socket *free;
cr_sema_t intr;
cr_mutex_t mu;
END_PRIVATE(LIBHW_W5500_H);
};
LO_IMPLEMENTATION_H(net_iface, struct w5500, w5500_if);
/**
* Initialize a WIZnet W5500 Ethernet-and-TCP/IP-offload chip.
*
* The W5500 has 3 lines of communication with the MCU:
*
* - An SPI-based RPC protocol:
* + mode: mode 0 or mode 3
* + bit-order: MSB-first
* + clock frequency: 33.3MHz - 80MHz
* - An interrupt pin that it pulls low when an event happens (to let
* the MCU know that it should do an SPI RPC "get" to see what
* happened.)
* - A reset pin that the MCU can pull low to reset the W5500.
*/
#define w5500_init(self, name, spi, pin_intr, pin_reset, eth_addr) do { \
bi_decl(bi_2pins_with_names(pin_intr, name" interrupt", \
pin_reset, name" reset")); \
_w5500_init(self, spi, pin_intr, pin_reset, eth_addr); \
} while (0)
void _w5500_init(struct w5500 *self,
lo_interface spi spi, uint pin_intr, uint pin_reset,
struct net_eth_addr addr);
/**
* Perform a hard reset on the chip (pull the reset line low).
*
* If you have any in-use sockets when you call this, you're going to
* have a bad time.
*/
void w5500_hard_reset(struct w5500 *self);
/**
* Perform a soft reset on the chip (send the RST command).
*
* If you have any in-use sockets when you call this, you're going to
* have a bad time.
*/
void w5500_soft_reset(struct w5500 *self);
#endif /* _LIBHW_W5500_H_ */
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