337 lines
12 KiB
C
337 lines
12 KiB
C
// Copyright (c) 2022 Cesanta Software Limited
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// All rights reserved
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "hardware/dma.h"
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#include "hardware/pio.h"
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#include "pico/stdlib.h"
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#include "driver_rp2040_rmii.h"
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#include "mongoose.h"
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#define RXSM 0
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#define TXSM 1
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#define SMITXSM 2
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#define SMIRXSM 0 // pio1
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static uint smi_wr_addr, smi_rd_addr;
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static int dma_rx;
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static int dma_tx;
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static dma_channel_config dmacfg_rx;
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static dma_channel_config dmacfg_tx;
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// Max frame size with VLAN tag + CRC and excluding preamble
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#define ETH_PKT_SIZE 1522
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static uint8_t s_rxbuf[2][ETH_PKT_SIZE]; // ping-pong buffer
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static uint8_t s_txbuf[ETH_PKT_SIZE];
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static struct mg_tcpip_if *s_ifp; // MIP interface
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#define rmii_tx_wrap_target 0
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#define rmii_tx_wrap 8
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static const uint16_t rmii_tx_program_instructions[] = {
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// .wrap_target
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0xe000, // 0: set pins, 0 side 0
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0x80a0, // 1: pull block side 0
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0xe03d, // 2: set x, 29 side 0
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0xf101, // 3: set pins, 1 side 1 [1]
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0x1144, // 4: jmp x--, 4 side 1 [1]
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0xf103, // 5: set pins, 3 side 1 [1]
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0x7002, // 6: out pins, 2 side 1
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0x10e6, // 7: jmp !osre, 6 side 1
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// .wrap
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};
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static const struct pio_program rmii_tx_program = {
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.instructions = rmii_tx_program_instructions,
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.length = 9,
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.origin = -1,
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};
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static inline pio_sm_config rmii_tx_program_get_default_config(uint addr) {
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pio_sm_config c = pio_get_default_sm_config();
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sm_config_set_wrap(&c, addr + rmii_tx_wrap_target, addr + rmii_tx_wrap);
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sm_config_set_sideset(&c, 1, false, false);
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return c;
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}
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static inline void rmii_tx_init(PIO pio, uint sm, uint addr, uint gpio) {
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pio_sm_config c = rmii_tx_program_get_default_config(addr);
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pio_gpio_init(pio, gpio);
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pio_gpio_init(pio, gpio + 1);
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pio_gpio_init(pio, gpio + 2);
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sm_config_set_out_pins(&c, gpio, 2);
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sm_config_set_set_pins(&c, gpio, 2);
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sm_config_set_sideset_pins(&c, gpio + 2);
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pio_sm_set_consecutive_pindirs(pio, sm, gpio, 3, true);
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sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
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sm_config_set_out_shift(&c, true, true, 8); // pull bytes, LSB first, auto
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sm_config_set_clkdiv(&c,
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5); // Run at 50/5 = 10MHz (2x 2-bit nibble data rate)
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pio_sm_init(pio, sm, addr, &c);
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pio_sm_set_enabled(pio, sm, true);
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}
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#define rmii_rx_wrap_target 0
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#define rmii_rx_wrap 10
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static const uint16_t rmii_rx_program_instructions[] = {
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// .wrap_target
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0x2122, // 0: wait 0 pin, 2 [1]
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0x21a2, // 1: wait 1 pin, 2 [1]
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0x21a0, // 2: wait 1 pin, 0 [1]
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0x2121, // 3: wait 0 pin, 1 [1]
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0x21a1, // 4: wait 1 pin, 1 [1]
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0x4002, // 5: in pins, 2
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0x00c5, // 6: jmp pin, 5
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0x4002, // 7: in pins, 2
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0x00c5, // 8: jmp pin, 5
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0xa0c3, // 9: mov isr, null
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0xc020, // 10: irq wait 0
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// .wrap
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};
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static const struct pio_program rmii_rx_program = {
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.instructions = rmii_rx_program_instructions,
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.length = 11,
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.origin = -1,
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};
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static inline pio_sm_config rmii_rx_program_get_default_config(uint addr) {
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pio_sm_config c = pio_get_default_sm_config();
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sm_config_set_wrap(&c, addr + rmii_rx_wrap_target, addr + rmii_rx_wrap);
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return c;
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}
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static inline void rmii_rx_init(PIO pio, uint sm, uint addr, uint gpio) {
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pio_sm_config c = rmii_rx_program_get_default_config(addr);
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pio_gpio_init(pio, gpio);
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pio_gpio_init(pio, gpio + 1);
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pio_gpio_init(pio, gpio + 2);
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sm_config_set_in_pins(&c, gpio);
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pio_sm_set_consecutive_pindirs(pio, sm, gpio, 3, false);
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sm_config_set_jmp_pin(&c, gpio + 2);
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sm_config_set_in_shift(&c, true, true, 8); // push bytes, LSB first, auto
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sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_RX);
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sm_config_set_clkdiv(&c,
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5); // Run at 50/5 = 10MHz (2x 2-bit nibble data rate)
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pio_sm_init(pio, sm, addr, &c);
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pio_sm_set_enabled(pio, sm, true);
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}
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#define smi_wr_wrap_target 0
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#define smi_wr_wrap 4
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static const uint16_t smi_wr_program_instructions[] = {
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// .wrap_target
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0xe03f, // 0: set x, 31 side 0
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0xe101, // 1: set pins, 1 side 0 [1]
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0x1141, // 2: jmp x--, 1 side 1 [1]
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0x6101, // 3: out pins, 1 side 0 [1]
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0x1103, // 4: jmp 3 side 1 [1]
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// .wrap
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};
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static const struct pio_program smi_wr_program = {
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.instructions = smi_wr_program_instructions,
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.length = 5,
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.origin = -1,
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};
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static inline pio_sm_config smi_wr_program_get_default_config(uint addr) {
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pio_sm_config c = pio_get_default_sm_config();
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sm_config_set_wrap(&c, addr + smi_wr_wrap_target, addr + smi_wr_wrap);
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sm_config_set_sideset(&c, 1, false, false);
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return c;
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}
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#define smi_rd_wrap_target 13
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#define smi_rd_wrap 13
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static const uint16_t smi_rd_program_instructions[] = {
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0xe03f, // 0: set x, 31 side 0
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0xe101, // 1: set pins, 1 side 0 [1]
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0x1141, // 2: jmp x--, 1 side 1 [1]
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0xf02d, // 3: set x, 13 side 1
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0x6101, // 4: out pins, 1 side 0 [1]
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0x1144, // 5: jmp x--, 4 side 1 [1]
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0xe180, // 6: set pindirs, 0 side 0 [1]
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0xf101, // 7: set pins, 1 side 1 [1]
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0xa142, // 8: nop side 0 [1]
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0xf12f, // 9: set x, 15 side 1 [1]
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0xa042, // 10: nop side 0
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0x4001, // 11: in pins, 1 side 0
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0x114a, // 12: jmp x--, 10 side 1 [1]
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// .wrap_target
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0xf081, // 13: set pindirs, 1 side 1
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// .wrap
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};
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static const struct pio_program smi_rd_program = {
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.instructions = smi_rd_program_instructions,
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.length = 14,
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.origin = -1,
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};
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static inline pio_sm_config smi_rd_program_get_default_config(uint addr) {
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pio_sm_config c = pio_get_default_sm_config();
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sm_config_set_wrap(&c, addr + smi_rd_wrap_target, addr + smi_rd_wrap);
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sm_config_set_sideset(&c, 1, false, false);
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return c;
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}
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static inline void smi_wr_init(PIO pio, uint sm, uint addr, uint gpio) {
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pio_gpio_init(pio, gpio);
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pio_gpio_init(pio, gpio + 1);
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pio_sm_config c = smi_wr_program_get_default_config(addr);
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sm_config_set_out_pins(&c, gpio, 1);
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sm_config_set_set_pins(&c, gpio, 1);
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sm_config_set_sideset_pins(&c, gpio + 1);
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pio_sm_set_consecutive_pindirs(pio, sm, gpio, 2, true);
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sm_config_set_out_shift(&c, false, true,
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16); // pull half-words, MSB first, auto
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sm_config_set_clkdiv(&c, 6); // Run at 50/6 = <10MHz (4x data rate)
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pio_sm_init(pio, sm, addr, &c);
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}
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static inline void smi_rd_init(PIO pio, uint sm, uint addr, uint gpio) {
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pio_gpio_init(pio, gpio);
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pio_gpio_init(pio, gpio + 1);
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pio_sm_config c = smi_rd_program_get_default_config(addr);
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sm_config_set_in_pins(&c, gpio);
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sm_config_set_out_pins(&c, gpio, 1);
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sm_config_set_set_pins(&c, gpio, 1);
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sm_config_set_sideset_pins(&c, gpio + 1);
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pio_sm_set_consecutive_pindirs(pio, sm, gpio, 2, true);
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sm_config_set_out_shift(&c, false, true,
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16); // pull half-words, MSB first, auto
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sm_config_set_in_shift(&c, false, true,
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16); // push half-words, MSB first, auto
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sm_config_set_clkdiv(&c, 6); // Run at 50/6 = <10MHz (4x data rate)
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pio_sm_init(pio, sm, addr, &c);
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}
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static void eth_write_phy(int addr, int reg, int val, uint8_t gpio) {
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uint16_t op = 0x5002 | (addr << 7) | (reg << 2); // b0101aaaaarrrrr10
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smi_wr_init(pio0, SMITXSM, smi_wr_addr, gpio);
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pio_sm_put(pio0, SMITXSM, op << 16);
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pio_sm_put(pio0, SMITXSM, (uint16_t) val << 16);
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pio_sm_set_enabled(pio0, SMITXSM, true);
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}
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static uint16_t eth_read_phy(uint addr, uint reg, uint8_t gpio) {
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uint16_t op = 0x6000 | (addr << 7) | (reg << 2); // b0110aaaaarrrrr00
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smi_rd_init(pio1, SMIRXSM, smi_rd_addr, gpio);
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pio_sm_put(pio1, SMIRXSM, op << 16);
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pio_sm_set_enabled(pio1, SMIRXSM, true);
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uint16_t val = (uint16_t) pio_sm_get_blocking(pio1, SMIRXSM);
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pio_sm_set_enabled(pio1, SMIRXSM, false);
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return val;
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}
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static void rx_irq(void);
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static bool mg_tcpip_driver_rp2040_rmii_init(struct mg_tcpip_if *ifp) {
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struct mg_tcpip_driver_rp2040_rmii_data *d =
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(struct mg_tcpip_driver_rp2040_rmii_data *) ifp->driver_data;
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uint rx_sm_addr, tx_sm_addr;
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s_ifp = ifp;
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rx_sm_addr = pio_add_program(pio0, &rmii_rx_program);
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tx_sm_addr = pio_add_program(pio0, &rmii_tx_program);
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smi_wr_addr = pio_add_program(pio0, &smi_wr_program);
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smi_rd_addr = pio_add_program(pio1, &smi_rd_program);
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dma_tx = dma_claim_unused_channel(true);
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dmacfg_tx = dma_channel_get_default_config(dma_tx);
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channel_config_set_read_increment(&dmacfg_tx, true); // read from memory
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channel_config_set_write_increment(&dmacfg_tx, false); // write to FIFO
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channel_config_set_dreq(&dmacfg_tx, pio_get_dreq(pio0, TXSM, true));
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channel_config_set_transfer_data_size(&dmacfg_tx,
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DMA_SIZE_8); // transfer bytes
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rmii_tx_init(pio0, TXSM, tx_sm_addr, d->tx0);
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eth_write_phy(d->phy_addr, 4, 0x61,
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d->mdio); // Auto Negotiation Advertisement Register: enable
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// only 10BASE-T full and half duplex (two-pair), use
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// IEEE 802.3 format
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sleep_us(31); // give some time for PIO to work (64 bits @2.5MHz = 25.6 us)
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eth_write_phy(d->phy_addr, 0, 0x1000,
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d->mdio); // Basic Control Register: enable Auto-Negotiation
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sleep_us(31);
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dma_rx = dma_claim_unused_channel(true);
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dmacfg_rx = dma_channel_get_default_config(dma_rx);
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channel_config_set_read_increment(&dmacfg_rx, false); // read from FIFO
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channel_config_set_write_increment(&dmacfg_rx,
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true); // write to memory, increment
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channel_config_set_dreq(&dmacfg_rx, pio_get_dreq(pio0, RXSM, false));
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channel_config_set_transfer_data_size(&dmacfg_rx,
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DMA_SIZE_8); // transfer bytes
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dma_channel_configure(dma_rx, &dmacfg_rx, s_rxbuf[0],
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((uint8_t *) &pio0->rxf[RXSM]) + 3, ETH_PKT_SIZE, true);
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pio_set_irq0_source_enabled(pio0, pis_interrupt0,
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true); // enable SM0 on PIO0_IRQ_0
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irq_set_exclusive_handler(7, rx_irq); // set handler for PIO0_IRQ_0
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irq_set_enabled(7, true); // enable it
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rmii_rx_init(pio0, RXSM, rx_sm_addr, d->rx0);
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return true;
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}
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static size_t mg_tcpip_driver_rp2040_rmii_tx(const void *buf, size_t len,
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struct mg_tcpip_if *ifp) {
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dma_channel_wait_for_finish_blocking(dma_tx);
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memset(s_txbuf, 0, 60); // pre-pad
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memcpy(s_txbuf, buf, len);
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if (len < 60) len = 60; // pad
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uint32_t crc = mg_crc32(0, s_txbuf, len); // host is little-endian
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memcpy(s_txbuf + len, (uint8_t *) &crc, 4);
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len += 4;
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sleep_us(10); // enforce IFG in case software has been lightning fast...
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dma_channel_configure(dma_tx, &dmacfg_tx, ((uint8_t *) &pio0->txf[TXSM]) + 3,
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s_txbuf, len, true);
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return len;
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}
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static uint32_t s_rxno;
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// The max amount of time we should keep the PIO state machine stopped is the
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// IFG time (10us) and that includes irq latency
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static void rx_irq(void) {
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dma_channel_hw_t *hw = dma_channel_hw_addr(dma_rx);
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uint32_t rxno =
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(s_rxno + 1) &
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1; // 2 buffers, switch to the available one as fast as possible
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size_t len = ETH_PKT_SIZE - hw->transfer_count;
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dma_channel_abort(dma_rx);
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dma_channel_set_write_addr(dma_rx, s_rxbuf[rxno], true); // restart DMA
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pio_interrupt_clear(pio0,
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0); // ACK PIO IRQ so the state machine resumes receiving
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// NOTE(scaprile) Here we could check addressing to avoid queuing frames not
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// for us. The max amount of time we can linger here is what it takes for the
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// other buffer to fill (<8us) and that includes irq chaining
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if (len >= 64 && len <= ETH_PKT_SIZE)
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mg_tcpip_qwrite(s_rxbuf[s_rxno], len, s_ifp);
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s_rxno = rxno;
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}
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static bool mg_tcpip_driver_rp2040_rmii_up(struct mg_tcpip_if *ifp) {
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struct mg_tcpip_driver_rp2040_rmii_data *d =
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(struct mg_tcpip_driver_rp2040_rmii_data *) ifp->driver_data;
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uint32_t bsr =
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eth_read_phy(d->phy_addr, 1, d->mdio); // Basic Status Register
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return (bsr & (1 << 2)) ? 1 : 0; // check Link Status flag
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}
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struct mg_tcpip_driver mg_tcpip_driver_rp2040_rmii = {
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mg_tcpip_driver_rp2040_rmii_init,
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mg_tcpip_driver_rp2040_rmii_tx,
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NULL,
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mg_tcpip_driver_rp2040_rmii_up,
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};
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