drivers/usb/musb/blackfin.h

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2007 by Analog Devices, Inc.
 *
 * The Inventra Controller Driver for Linux is free software; you
 * can redistribute it and/or modify it under the terms of the GNU
 * General Public License version 2 as published by the Free Software
 * Foundation.
 */

#ifndef __MUSB_BLACKFIN_H__
#define __MUSB_BLACKFIN_H__

/*
 * Blackfin specific definitions
 */

/* Anomalies notes:
 *
 *  05000450 - USB DMA Mode 1 Short Packet Data Corruption:
 *             MUSB driver is designed to transfer buffer of N * maxpacket size
 *             in DMA mode 1 and leave the rest of the data to the next
 *             transfer in DMA mode 0, so we never transmit a short packet in
 *             DMA mode 1.
 *
 *  05000463 - This anomaly doesn't affect this driver since it
 *             never uses L1 or L2 memory as data destination.
 *
 *  05000464 - This anomaly doesn't affect this driver since it
 *             never uses L1 or L2 memory as data source.
 *
 *  05000465 - The anomaly can be seen when SCLK is over 100 MHz, and there is
 *             no way to workaround for bulk endpoints.  Since the wMaxPackSize
 *             of bulk is less than or equal to 512, while the fifo size of
 *             endpoint 5, 6, 7 is 1024, the double buffer mode is enabled
 *             automatically when these endpoints are used for bulk OUT.
 *
 *  05000466 - This anomaly doesn't affect this driver since it never mixes
 *             concurrent DMA and core accesses to the TX endpoint FIFOs.
 *
 *  05000467 - The workaround for this anomaly will introduce another
 *             anomaly - 05000465.
 */

/* The Mentor USB DMA engine on BF52x (silicon v0.0 and v0.1) seems to be
 * unstable in host mode.  This may be caused by Anomaly 05000380.  After
 * digging out the root cause, we will change this number accordingly.
 * So, need to either use silicon v0.2+ or disable DMA mode in MUSB.
 */
#if ANOMALY_05000380 && defined(CONFIG_BF52x) && \
	!defined(CONFIG_MUSB_PIO_ONLY)
# error "Please use PIO mode in MUSB driver on bf52x chip v0.0 and v0.1"
#endif

#undef DUMP_FIFO_DATA
#ifdef DUMP_FIFO_DATA
static void dump_fifo_data(u8 *buf, u16 len)
{
	u8 *tmp = buf;
	int i;

	for (i = 0; i < len; i++) {
		if (!(i % 16) && i)
			pr_debug("\n");
		pr_debug("%02x ", *tmp++);
	}
	pr_debug("\n");
}
#else
#define dump_fifo_data(buf, len)	do {} while (0)
#endif


#define USB_DMA_BASE		USB_DMA_INTERRUPT
#define USB_DMAx_CTRL		0x04
#define USB_DMAx_ADDR_LOW	0x08
#define USB_DMAx_ADDR_HIGH	0x0C
#define USB_DMAx_COUNT_LOW	0x10
#define USB_DMAx_COUNT_HIGH	0x14

#define USB_DMA_REG(ep, reg)	(USB_DMA_BASE + 0x20 * ep + reg)

/* Almost 1 second */
#define TIMER_DELAY	(1 * HZ)

static struct timer_list musb_conn_timer;

#endif	/* __MUSB_BLACKFIN_H__ */