mayhem-firmware/firmware/baseband/sd_over_usb/sd_over_usb.c

/*
 * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
 * Copyright (C) 2023 Bernd Herzog
 *
 * This file is part of PortaPack.
 *
 * 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 2, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "sd_over_usb.h"
#include "scsi.h"

bool scsi_running = false;

usb_request_status_t report_max_lun(
	usb_endpoint_t* const endpoint,
	const usb_transfer_stage_t stage)
{
	if (stage == USB_TRANSFER_STAGE_SETUP) {
		endpoint->buffer[0] = 0;
		usb_transfer_schedule_block(
			endpoint->in,
			&endpoint->buffer,
			1,
			NULL,
			NULL);

		usb_transfer_schedule_ack(endpoint->out);

		scsi_running = true;
	}
	
	return USB_REQUEST_STATUS_OK;
}

usb_request_status_t usb_class_request(usb_endpoint_t* const endpoint, const usb_transfer_stage_t stage) {
	usb_request_status_t status = USB_REQUEST_STATUS_STALL;

	volatile uint8_t request = endpoint->setup.request;

	if (request == 0xFE)
		return report_max_lun(endpoint, stage);

	return status;
}

const usb_request_handlers_t usb_request_handlers = {
	.standard = usb_standard_request,
	.class = usb_class_request,
	.vendor = 0,
	.reserved = 0
};

void usb_configuration_changed(usb_device_t* const device) {
	(void)device;

	usb_endpoint_init(&usb_endpoint_bulk_in);
	usb_endpoint_init(&usb_endpoint_bulk_out);
}

void start_usb(void) {
	detect_hardware_platform();
	pin_setup();
	cpu_clock_init();

	usb_set_configuration_changed_cb(usb_configuration_changed);
	usb_peripheral_reset();

	usb_device_init(0, &usb_device);

	usb_queue_init(&usb_endpoint_control_out_queue);
	usb_queue_init(&usb_endpoint_control_in_queue);
	usb_queue_init(&usb_endpoint_bulk_out_queue);
	usb_queue_init(&usb_endpoint_bulk_in_queue);

	usb_endpoint_init(&usb_endpoint_control_out);
	usb_endpoint_init(&usb_endpoint_control_in);

	nvic_set_priority(NVIC_USB0_IRQ, 255);

	usb_run(&usb_device);
}

void stop_usb(void) {
	usb_peripheral_reset();
}

void irq_usb(void) {
	usb0_isr();
}

volatile bool transfer_complete = false;
void scsi_bulk_transfer_complete(void* user_data, unsigned int bytes_transferred)
{
	(void)user_data;
	(void)bytes_transferred;

	transfer_complete = true;
}

void usb_transfer(void) {
	if (scsi_running) {
		transfer_complete = false;
		usb_transfer_schedule_block(
			&usb_endpoint_bulk_out,
			&usb_bulk_buffer[0x4000],
			USB_TRANSFER_SIZE,
			scsi_bulk_transfer_complete,
			NULL);

		while (!transfer_complete);

		msd_cbw_t *msd_cbw_data = (msd_cbw_t *) &usb_bulk_buffer[0x4000];

		if (msd_cbw_data->signature == MSD_CBW_SIGNATURE){
			scsi_command(msd_cbw_data);
		}
	}
}