/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 1997, 1998, 1999
 *	Bill Paul <wpaul@ee.columbia.edu>.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Bill Paul.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 */

/*
 * Register definitions for ADMtek Pegasus AN986 USB to Ethernet
 * chip. The Pegasus uses a total of four USB endpoints: the control
 * endpoint (0), a bulk read endpoint for receiving packets (1),
 * a bulk write endpoint for sending packets (2) and an interrupt
 * endpoint for passing RX and TX status (3). Endpoint 0 is used
 * to read and write the ethernet module's registers. All registers
 * are 8 bits wide.
 *
 * Packet transfer is done in 64 byte chunks. The last chunk in a
 * transfer is denoted by having a length less that 64 bytes. For
 * the RX case, the data includes an optional RX status word.
 */

#define	AUE_UR_READREG		0xF0
#define	AUE_UR_WRITEREG		0xF1

#define	AUE_CONFIG_INDEX	0	/* config number 1 */
#define	AUE_IFACE_IDX		0

/*
 * Note that while the ADMtek technically has four endpoints, the control
 * endpoint (endpoint 0) is regarded as special by the USB code and drivers
 * don't have direct access to it (we access it using usbd_do_request()
 * when reading/writing registers.  Consequently, our endpoint indexes
 * don't match those in the ADMtek Pegasus manual: we consider the RX data
 * endpoint to be index 0 and work up from there.
 */
enum {
	AUE_BULK_DT_WR,
	AUE_BULK_DT_RD,
	AUE_INTR_DT_RD,
	AUE_N_TRANSFER,
};

#define	AUE_INTR_PKTLEN		0x8

#define	AUE_CTL0		0x00
#define	AUE_CTL1		0x01
#define	AUE_CTL2		0x02
#define	AUE_MAR0		0x08
#define	AUE_MAR1		0x09
#define	AUE_MAR2		0x0A
#define	AUE_MAR3		0x0B
#define	AUE_MAR4		0x0C
#define	AUE_MAR5		0x0D
#define	AUE_MAR6		0x0E
#define	AUE_MAR7		0x0F
#define	AUE_MAR			AUE_MAR0
#define	AUE_PAR0		0x10
#define	AUE_PAR1		0x11
#define	AUE_PAR2		0x12
#define	AUE_PAR3		0x13
#define	AUE_PAR4		0x14
#define	AUE_PAR5		0x15
#define	AUE_PAR			AUE_PAR0
#define	AUE_PAUSE0		0x18
#define	AUE_PAUSE1		0x19
#define	AUE_PAUSE		AUE_PAUSE0
#define	AUE_RX_FLOWCTL_CNT	0x1A
#define	AUE_RX_FLOWCTL_FIFO	0x1B
#define	AUE_REG_1D		0x1D
#define	AUE_EE_REG		0x20
#define	AUE_EE_DATA0		0x21
#define	AUE_EE_DATA1		0x22
#define	AUE_EE_DATA		AUE_EE_DATA0
#define	AUE_EE_CTL		0x23
#define	AUE_PHY_ADDR		0x25
#define	AUE_PHY_DATA0		0x26
#define	AUE_PHY_DATA1		0x27
#define	AUE_PHY_DATA		AUE_PHY_DATA0
#define	AUE_PHY_CTL		0x28
#define	AUE_USB_STS		0x2A
#define	AUE_TXSTAT0		0x2B
#define	AUE_TXSTAT1		0x2C
#define	AUE_TXSTAT		AUE_TXSTAT0
#define	AUE_RXSTAT		0x2D
#define	AUE_PKTLOST0		0x2E
#define	AUE_PKTLOST1		0x2F
#define	AUE_PKTLOST		AUE_PKTLOST0

#define	AUE_REG_7B		0x7B
#define	AUE_GPIO0		0x7E
#define	AUE_GPIO1		0x7F
#define	AUE_REG_81		0x81

#define	AUE_CTL0_INCLUDE_RXCRC	0x01
#define	AUE_CTL0_ALLMULTI	0x02
#define	AUE_CTL0_STOP_BACKOFF	0x04
#define	AUE_CTL0_RXSTAT_APPEND	0x08
#define	AUE_CTL0_WAKEON_ENB	0x10
#define	AUE_CTL0_RXPAUSE_ENB	0x20
#define	AUE_CTL0_RX_ENB		0x40
#define	AUE_CTL0_TX_ENB		0x80

#define	AUE_CTL1_HOMELAN	0x04
#define	AUE_CTL1_RESETMAC	0x08
#define	AUE_CTL1_SPEEDSEL	0x10	/* 0 = 10mbps, 1 = 100mbps */
#define	AUE_CTL1_DUPLEX		0x20	/* 0 = half, 1 = full */
#define	AUE_CTL1_DELAYHOME	0x40

#define	AUE_CTL2_EP3_CLR	0x01	/* reading EP3 clrs status regs */
#define	AUE_CTL2_RX_BADFRAMES	0x02
#define	AUE_CTL2_RX_PROMISC	0x04
#define	AUE_CTL2_LOOPBACK	0x08
#define	AUE_CTL2_EEPROMWR_ENB	0x10
#define	AUE_CTL2_EEPROM_LOAD	0x20

#define	AUE_EECTL_WRITE		0x01
#define	AUE_EECTL_READ		0x02
#define	AUE_EECTL_DONE		0x04

#define	AUE_PHYCTL_PHYREG	0x1F
#define	AUE_PHYCTL_WRITE	0x20
#define	AUE_PHYCTL_READ		0x40
#define	AUE_PHYCTL_DONE		0x80

#define	AUE_USBSTS_SUSPEND	0x01
#define	AUE_USBSTS_RESUME	0x02

#define	AUE_TXSTAT0_JABTIMO	0x04
#define	AUE_TXSTAT0_CARLOSS	0x08
#define	AUE_TXSTAT0_NOCARRIER	0x10
#define	AUE_TXSTAT0_LATECOLL	0x20
#define	AUE_TXSTAT0_EXCESSCOLL	0x40
#define	AUE_TXSTAT0_UNDERRUN	0x80

#define	AUE_TXSTAT1_PKTCNT	0x0F
#define	AUE_TXSTAT1_FIFO_EMPTY	0x40
#define	AUE_TXSTAT1_FIFO_FULL	0x80

#define	AUE_RXSTAT_OVERRUN	0x01
#define	AUE_RXSTAT_PAUSE	0x02

#define	AUE_GPIO_IN0		0x01
#define	AUE_GPIO_OUT0		0x02
#define	AUE_GPIO_SEL0		0x04
#define	AUE_GPIO_IN1		0x08
#define	AUE_GPIO_OUT1		0x10
#define	AUE_GPIO_SEL1		0x20

#define	AUE_TIMEOUT		100	/* 10*ms */
#define	AUE_MIN_FRAMELEN	60

#define	AUE_RXSTAT_MCAST	0x01
#define	AUE_RXSTAT_GIANT	0x02
#define	AUE_RXSTAT_RUNT		0x04
#define	AUE_RXSTAT_CRCERR	0x08
#define	AUE_RXSTAT_DRIBBLE	0x10
#define	AUE_RXSTAT_MASK		0x1E

#define	GET_MII(sc)		uether_getmii(&(sc)->sc_ue)

struct aue_intrpkt {
	uint8_t	aue_txstat0;
	uint8_t	aue_txstat1;
	uint8_t	aue_rxstat;
	uint8_t	aue_rxlostpkt0;
	uint8_t	aue_rxlostpkt1;
	uint8_t	aue_wakeupstat;
	uint8_t	aue_rsvd;
} __packed;

struct aue_rxpkt {
	uint16_t aue_pktlen;
	uint8_t	aue_rxstat;
	uint8_t	pad;
} __packed;

struct aue_softc {
	struct usb_ether	sc_ue;
	struct mtx		sc_mtx;
	struct usb_xfer	*sc_xfer[AUE_N_TRANSFER];

	int			sc_flags;
#define	AUE_FLAG_LSYS		0x0001	/* use Linksys reset */
#define	AUE_FLAG_PNA		0x0002	/* has Home PNA */
#define	AUE_FLAG_PII		0x0004	/* Pegasus II chip */
#define	AUE_FLAG_LINK		0x0008	/* wait for link to come up */
#define	AUE_FLAG_VER_2		0x0200	/* chip is version 2 */
#define	AUE_FLAG_DUAL_PHY	0x0400	/* chip has two transcivers */
};

#define	AUE_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
#define	AUE_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_mtx)
#define	AUE_LOCK_ASSERT(_sc, t)	mtx_assert(&(_sc)->sc_mtx, t)