m1-pd-bmc.h

// FUSB302-based serial/reset/whatever controller for M1-based systems

#include <stdint.h>
#include <stdbool.h>

#include "pico/stdlib.h"

#include "hardware/gpio.h"
#include "hardware/i2c.h"
#include "tusb.h"

struct gpio_pin_config {
	uint16_t		pin;
	gpio_function_t		mode;
	int			dir;
	bool			pu;
	bool			level;
	bool			skip;
};

enum m1_pd_bmc_pins {
	M1_BMC_PIN_START,
	LED_G = M1_BMC_PIN_START,
	I2C_SDA,
	I2C_SCL,
	FUSB_INT,
	FUSB_VBUS,
	UART_TX,
	UART_RX,
	SBU_SWAP,
	SEL_USB,
	LED_R_TX,
	LED_R_RX,
	M1_BMC_PIN_END = LED_R_RX,
};

struct hw_context {
	const struct gpio_pin_config 	*pins;
	uart_inst_t 			*const uart;
	i2c_inst_t			*const i2c;
	void				(*uart_handler)(void);
	uint8_t		 		addr;
	uint8_t				nr_pins;
	uint8_t				uart_irq;
};

const struct hw_context *get_hw_from_port(int port);
void m1_pd_bmc_fusb_setup(unsigned int port,
			  const struct hw_context *hw);
void m1_pd_bmc_run(void);

struct upstream_ops {
	void	(*tx_bytes)(int32_t port, const char *ptr, int len);
	int32_t	(*rx_byte)(int32_t port);
	void	(*flush)(void);
};

extern const struct upstream_ops *upstream_ops;
void set_upstream_ops(bool serial);
bool upstream_is_serial(void);

int get_valid_ports(void);

void upstream_tx_str(int32_t port, const char *ptr);

#define PRINTF_SIZE	512

#define __printf(__p, __f, ...)	do {					\
		char __str[PRINTF_SIZE];				\
		snprintf(__str, PRINTF_SIZE, __f, ##__VA_ARGS__);	\
		upstream_tx_str(__p, __str);				\
		upstream_ops->flush();					\
	} while(0)

#define ARRAY_SIZE(arr)	(sizeof(arr) / sizeof((arr)[0]))

/*
 * Stupid hack. Probably best to move this to a per-platform file if
 * this ever grows.
 */
#if defined(RASPBERRYPI_PICO)
#define FRQ_KHZ	133000
#elif defined(RASPBERRYPI_PICO2)
#define FRQ_KHZ	150000
#else
#error Unknown board
#endif