[linux-2.6-block.git] / drivers / usb / gadget / udc / net2272.h

// SPDX-License-Identifier: GPL-2.0+
/*
 * PLX NET2272 high/full speed USB device controller
 *
 * Copyright (C) 2005-2006 PLX Technology, Inc.
 * Copyright (C) 2006-2011 Analog Devices, Inc.
 *
 * 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 of the License, 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; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef __NET2272_H__
#define __NET2272_H__

/* Main Registers */
#define REGADDRPTR			0x00
#define REGDATA				0x01
#define IRQSTAT0			0x02
#define 	ENDPOINT_0_INTERRUPT			0
#define 	ENDPOINT_A_INTERRUPT			1
#define 	ENDPOINT_B_INTERRUPT			2
#define 	ENDPOINT_C_INTERRUPT			3
#define 	VIRTUALIZED_ENDPOINT_INTERRUPT		4
#define 	SETUP_PACKET_INTERRUPT			5
#define 	DMA_DONE_INTERRUPT			6
#define 	SOF_INTERRUPT				7
#define IRQSTAT1			0x03
#define 	CONTROL_STATUS_INTERRUPT		1
#define 	VBUS_INTERRUPT				2
#define 	SUSPEND_REQUEST_INTERRUPT		3
#define 	SUSPEND_REQUEST_CHANGE_INTERRUPT	4
#define 	RESUME_INTERRUPT			5
#define 	ROOT_PORT_RESET_INTERRUPT		6
#define 	RESET_STATUS				7
#define PAGESEL				0x04
#define DMAREQ				0x1c
#define 	DMA_ENDPOINT_SELECT			0
#define 	DREQ_POLARITY				1
#define 	DACK_POLARITY				2
#define 	EOT_POLARITY				3
#define 	DMA_CONTROL_DACK			4
#define 	DMA_REQUEST_ENABLE			5
#define 	DMA_REQUEST				6
#define 	DMA_BUFFER_VALID			7
#define SCRATCH				0x1d
#define IRQENB0				0x20
#define 	ENDPOINT_0_INTERRUPT_ENABLE		0
#define 	ENDPOINT_A_INTERRUPT_ENABLE		1
#define 	ENDPOINT_B_INTERRUPT_ENABLE		2
#define 	ENDPOINT_C_INTERRUPT_ENABLE		3
#define 	VIRTUALIZED_ENDPOINT_INTERRUPT_ENABLE	4
#define 	SETUP_PACKET_INTERRUPT_ENABLE		5
#define 	DMA_DONE_INTERRUPT_ENABLE		6
#define 	SOF_INTERRUPT_ENABLE			7
#define IRQENB1				0x21
#define 	VBUS_INTERRUPT_ENABLE			2
#define 	SUSPEND_REQUEST_INTERRUPT_ENABLE	3
#define 	SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE	4
#define 	RESUME_INTERRUPT_ENABLE			5
#define 	ROOT_PORT_RESET_INTERRUPT_ENABLE	6
#define LOCCTL				0x22
#define 	DATA_WIDTH				0
#define 	LOCAL_CLOCK_OUTPUT			1
#define 		LOCAL_CLOCK_OUTPUT_OFF			0
#define 		LOCAL_CLOCK_OUTPUT_3_75MHZ		1
#define 		LOCAL_CLOCK_OUTPUT_7_5MHZ		2
#define 		LOCAL_CLOCK_OUTPUT_15MHZ		3
#define 		LOCAL_CLOCK_OUTPUT_30MHZ		4
#define 		LOCAL_CLOCK_OUTPUT_60MHZ		5
#define 	DMA_SPLIT_BUS_MODE			4
#define 	BYTE_SWAP				5
#define 	BUFFER_CONFIGURATION			6
#define 		BUFFER_CONFIGURATION_EPA512_EPB512	0
#define 		BUFFER_CONFIGURATION_EPA1024_EPB512	1
#define 		BUFFER_CONFIGURATION_EPA1024_EPB1024	2
#define 		BUFFER_CONFIGURATION_EPA1024DB		3
#define CHIPREV_LEGACY			0x23
#define 		NET2270_LEGACY_REV			0x40
#define LOCCTL1				0x24
#define 	DMA_MODE				0
#define 		SLOW_DREQ				0
#define 		FAST_DREQ				1
#define 		BURST_MODE				2
#define 	DMA_DACK_ENABLE				2
#define CHIPREV_2272			0x25
#define 		CHIPREV_NET2272_R1			0x10
#define 		CHIPREV_NET2272_R1A			0x11
/* USB Registers */
#define USBCTL0				0x18
#define 	IO_WAKEUP_ENABLE			1
#define 	USB_DETECT_ENABLE			3
#define 	USB_ROOT_PORT_WAKEUP_ENABLE		5
#define USBCTL1				0x19
#define 	VBUS_PIN				0
#define 		USB_FULL_SPEED				1
#define 		USB_HIGH_SPEED				2
#define 	GENERATE_RESUME				3
#define 	VIRTUAL_ENDPOINT_ENABLE			4
#define FRAME0				0x1a
#define FRAME1				0x1b
#define OURADDR				0x30
#define 	FORCE_IMMEDIATE				7
#define USBDIAG				0x31
#define 	FORCE_TRANSMIT_CRC_ERROR		0
#define 	PREVENT_TRANSMIT_BIT_STUFF		1
#define 	FORCE_RECEIVE_ERROR			2
#define 	FAST_TIMES				4
#define USBTEST				0x32
#define 	TEST_MODE_SELECT			0
#define 		NORMAL_OPERATION			0
#define 		TEST_J					1
#define 		TEST_K					2
#define 		TEST_SE0_NAK				3
#define 		TEST_PACKET				4
#define 		TEST_FORCE_ENABLE			5
#define XCVRDIAG			0x33
#define 	FORCE_FULL_SPEED			2
#define 	FORCE_HIGH_SPEED			3
#define 	OPMODE					4
#define 		NORMAL_OPERATION			0
#define 		NON_DRIVING				1
#define 		DISABLE_BITSTUFF_AND_NRZI_ENCODE	2
#define 	LINESTATE				6
#define 		SE0_STATE				0
#define 		J_STATE					1
#define 		K_STATE					2
#define 		SE1_STATE				3
#define VIRTOUT0			0x34
#define VIRTOUT1			0x35
#define VIRTIN0				0x36
#define VIRTIN1				0x37
#define SETUP0				0x40
#define SETUP1				0x41
#define SETUP2				0x42
#define SETUP3				0x43
#define SETUP4				0x44
#define SETUP5				0x45
#define SETUP6				0x46
#define SETUP7				0x47
/* Endpoint Registers (Paged via PAGESEL) */
#define EP_DATA				0x05
#define EP_STAT0			0x06
#define 	DATA_IN_TOKEN_INTERRUPT			0
#define 	DATA_OUT_TOKEN_INTERRUPT		1
#define 	DATA_PACKET_TRANSMITTED_INTERRUPT	2
#define 	DATA_PACKET_RECEIVED_INTERRUPT		3
#define 	SHORT_PACKET_TRANSFERRED_INTERRUPT	4
#define 	NAK_OUT_PACKETS				5
#define 	BUFFER_EMPTY				6
#define 	BUFFER_FULL				7
#define EP_STAT1			0x07
#define 	TIMEOUT					0
#define 	USB_OUT_ACK_SENT			1
#define 	USB_OUT_NAK_SENT			2
#define 	USB_IN_ACK_RCVD				3
#define 	USB_IN_NAK_SENT				4
#define 	USB_STALL_SENT				5
#define 	LOCAL_OUT_ZLP				6
#define 	BUFFER_FLUSH				7
#define EP_TRANSFER0			0x08
#define EP_TRANSFER1			0x09
#define EP_TRANSFER2			0x0a
#define EP_IRQENB			0x0b
#define 	DATA_IN_TOKEN_INTERRUPT_ENABLE		0
#define 	DATA_OUT_TOKEN_INTERRUPT_ENABLE		1
#define 	DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE	2
#define 	DATA_PACKET_RECEIVED_INTERRUPT_ENABLE	3
#define 	SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE	4
#define EP_AVAIL0			0x0c
#define EP_AVAIL1			0x0d
#define EP_RSPCLR			0x0e
#define EP_RSPSET			0x0f
#define 	ENDPOINT_HALT				0
#define 	ENDPOINT_TOGGLE				1
#define 	NAK_OUT_PACKETS_MODE			2
#define 	CONTROL_STATUS_PHASE_HANDSHAKE		3
#define 	INTERRUPT_MODE				4
#define 	AUTOVALIDATE				5
#define 	HIDE_STATUS_PHASE			6
#define 	ALT_NAK_OUT_PACKETS			7
#define EP_MAXPKT0			0x28
#define EP_MAXPKT1			0x29
#define 	ADDITIONAL_TRANSACTION_OPPORTUNITIES	3
#define 		NONE_ADDITIONAL_TRANSACTION		0
#define 		ONE_ADDITIONAL_TRANSACTION		1
#define 		TWO_ADDITIONAL_TRANSACTION		2
#define EP_CFG				0x2a
#define 	ENDPOINT_NUMBER				0
#define 	ENDPOINT_DIRECTION			4
#define 	ENDPOINT_TYPE				5
#define 	ENDPOINT_ENABLE				7
#define EP_HBW				0x2b
#define 	HIGH_BANDWIDTH_OUT_TRANSACTION_PID	0
#define 		DATA0_PID				0
#define 		DATA1_PID				1
#define 		DATA2_PID				2
#define 		MDATA_PID				3
#define EP_BUFF_STATES			0x2c
#define 	BUFFER_A_STATE				0
#define 	BUFFER_B_STATE				2
#define 		BUFF_FREE				0
#define 		BUFF_VALID				1
#define 		BUFF_LCL				2
#define 		BUFF_USB				3

/*---------------------------------------------------------------------------*/

#define PCI_DEVICE_ID_RDK1	0x9054

/* PCI-RDK EPLD Registers */
#define RDK_EPLD_IO_REGISTER1		0x00000000
#define 	RDK_EPLD_USB_RESET				0
#define 	RDK_EPLD_USB_POWERDOWN				1
#define 	RDK_EPLD_USB_WAKEUP				2
#define 	RDK_EPLD_USB_EOT				3
#define 	RDK_EPLD_DPPULL					4
#define RDK_EPLD_IO_REGISTER2		0x00000004
#define 	RDK_EPLD_BUSWIDTH				0
#define 	RDK_EPLD_USER					2
#define 	RDK_EPLD_RESET_INTERRUPT_ENABLE			3
#define 	RDK_EPLD_DMA_TIMEOUT_ENABLE			4
#define RDK_EPLD_STATUS_REGISTER	0x00000008
#define 	RDK_EPLD_USB_LRESET				0
#define RDK_EPLD_REVISION_REGISTER	0x0000000c

/* PCI-RDK PLX 9054 Registers */
#define INTCSR				0x68
#define 	PCI_INTERRUPT_ENABLE				8
#define 	LOCAL_INTERRUPT_INPUT_ENABLE			11
#define 	LOCAL_INPUT_INTERRUPT_ACTIVE			15
#define 	LOCAL_DMA_CHANNEL_0_INTERRUPT_ENABLE		18
#define 	LOCAL_DMA_CHANNEL_1_INTERRUPT_ENABLE		19
#define 	DMA_CHANNEL_0_INTERRUPT_ACTIVE			21
#define 	DMA_CHANNEL_1_INTERRUPT_ACTIVE			22
#define CNTRL				0x6C
#define 	RELOAD_CONFIGURATION_REGISTERS			29
#define 	PCI_ADAPTER_SOFTWARE_RESET			30
#define DMAMODE0			0x80
#define 	LOCAL_BUS_WIDTH					0
#define 	INTERNAL_WAIT_STATES				2
#define 	TA_READY_INPUT_ENABLE				6
#define 	LOCAL_BURST_ENABLE				8
#define 	SCATTER_GATHER_MODE				9
#define 	DONE_INTERRUPT_ENABLE				10
#define 	LOCAL_ADDRESSING_MODE				11
#define 	DEMAND_MODE					12
#define 	DMA_EOT_ENABLE					14
#define 	FAST_SLOW_TERMINATE_MODE_SELECT			15
#define 	DMA_CHANNEL_INTERRUPT_SELECT			17
#define DMAPADR0			0x84
#define DMALADR0			0x88
#define DMASIZ0				0x8c
#define DMADPR0				0x90
#define 	DESCRIPTOR_LOCATION				0
#define 	END_OF_CHAIN					1
#define 	INTERRUPT_AFTER_TERMINAL_COUNT			2
#define 	DIRECTION_OF_TRANSFER				3
#define DMACSR0				0xa8
#define 	CHANNEL_ENABLE					0
#define 	CHANNEL_START					1
#define 	CHANNEL_ABORT					2
#define 	CHANNEL_CLEAR_INTERRUPT				3
#define 	CHANNEL_DONE					4
#define DMATHR				0xb0
#define LBRD1				0xf8
#define 	MEMORY_SPACE_LOCAL_BUS_WIDTH			0
#define 	W8_BIT						0
#define 	W16_BIT						1

/* Special OR'ing of INTCSR bits */
#define LOCAL_INTERRUPT_TEST \
	((1 << LOCAL_INPUT_INTERRUPT_ACTIVE) | \
	 (1 << LOCAL_INTERRUPT_INPUT_ENABLE))

#define DMA_CHANNEL_0_TEST \
	((1 << DMA_CHANNEL_0_INTERRUPT_ACTIVE) | \
	 (1 << LOCAL_DMA_CHANNEL_0_INTERRUPT_ENABLE))

#define DMA_CHANNEL_1_TEST \
	((1 << DMA_CHANNEL_1_INTERRUPT_ACTIVE) | \
	 (1 << LOCAL_DMA_CHANNEL_1_INTERRUPT_ENABLE))

/* EPLD Registers */
#define RDK_EPLD_IO_REGISTER1			0x00000000
#define 	RDK_EPLD_USB_RESET			0
#define 	RDK_EPLD_USB_POWERDOWN			1
#define 	RDK_EPLD_USB_WAKEUP			2
#define 	RDK_EPLD_USB_EOT			3
#define 	RDK_EPLD_DPPULL				4
#define RDK_EPLD_IO_REGISTER2			0x00000004
#define 	RDK_EPLD_BUSWIDTH			0
#define 	RDK_EPLD_USER				2
#define 	RDK_EPLD_RESET_INTERRUPT_ENABLE		3
#define 	RDK_EPLD_DMA_TIMEOUT_ENABLE		4
#define RDK_EPLD_STATUS_REGISTER		0x00000008
#define RDK_EPLD_USB_LRESET				0
#define RDK_EPLD_REVISION_REGISTER		0x0000000c

#define EPLD_IO_CONTROL_REGISTER		0x400
#define 	NET2272_RESET				0
#define 	BUSWIDTH				1
#define 	MPX_MODE				3
#define 	USER					4
#define 	DMA_TIMEOUT_ENABLE			5
#define 	DMA_CTL_DACK				6
#define 	EPLD_DMA_ENABLE				7
#define EPLD_DMA_CONTROL_REGISTER		0x800
#define 	SPLIT_DMA_MODE				0
#define 	SPLIT_DMA_DIRECTION			1
#define 	SPLIT_DMA_ENABLE			2
#define 	SPLIT_DMA_INTERRUPT_ENABLE		3
#define 	SPLIT_DMA_INTERRUPT			4
#define 	EPLD_DMA_MODE				5
#define 	EPLD_DMA_CONTROLLER_ENABLE		7
#define SPLIT_DMA_ADDRESS_LOW			0xc00
#define SPLIT_DMA_ADDRESS_HIGH			0x1000
#define SPLIT_DMA_BYTE_COUNT_LOW		0x1400
#define SPLIT_DMA_BYTE_COUNT_HIGH		0x1800
#define EPLD_REVISION_REGISTER			0x1c00
#define SPLIT_DMA_RAM				0x4000
#define DMA_RAM_SIZE				0x1000

/*---------------------------------------------------------------------------*/

#define PCI_DEVICE_ID_RDK2	0x3272

/* PCI-RDK version 2 registers */

/* Main Control Registers */

#define RDK2_IRQENB			0x00
#define RDK2_IRQSTAT			0x04
#define 	PB7				23
#define 	PB6				22
#define 	PB5				21
#define 	PB4				20
#define 	PB3				19
#define 	PB2				18
#define 	PB1				17
#define 	PB0				16
#define 	GP3				23
#define 	GP2				23
#define 	GP1				23
#define 	GP0				23
#define 	DMA_RETRY_ABORT			6
#define 	DMA_PAUSE_DONE			5
#define 	DMA_ABORT_DONE			4
#define 	DMA_OUT_FIFO_TRANSFER_DONE	3
#define 	DMA_LOCAL_DONE			2
#define 	DMA_PCI_DONE			1
#define 	NET2272_PCI_IRQ			0

#define RDK2_LOCCTLRDK			0x08
#define 	CHIP_RESET			3
#define 	SPLIT_DMA			2
#define 	MULTIPLEX_MODE			1
#define 	BUS_WIDTH			0

#define RDK2_GPIOCTL			0x10
#define 	GP3_OUT_ENABLE					7
#define 	GP2_OUT_ENABLE					6
#define 	GP1_OUT_ENABLE					5
#define 	GP0_OUT_ENABLE					4
#define 	GP3_DATA					3
#define 	GP2_DATA					2
#define 	GP1_DATA					1
#define 	GP0_DATA					0

#define RDK2_LEDSW			0x14
#define 	LED3				27
#define 	LED2				26
#define 	LED1				25
#define 	LED0				24
#define 	PBUTTON				16
#define 	DIPSW				0

#define RDK2_DIAG			0x18
#define 	RDK2_FAST_TIMES				2
#define 	FORCE_PCI_SERR				1
#define 	FORCE_PCI_INT				0
#define RDK2_FPGAREV			0x1C

/* Dma Control registers */
#define RDK2_DMACTL			0x80
#define 	ADDR_HOLD				24
#define 	RETRY_COUNT				16	/* 23:16 */
#define 	FIFO_THRESHOLD				11	/* 15:11 */
#define 	MEM_WRITE_INVALIDATE			10
#define 	READ_MULTIPLE				9
#define 	READ_LINE				8
#define 	RDK2_DMA_MODE				6	/* 7:6 */
#define 	CONTROL_DACK				5
#define 	EOT_ENABLE				4
#define 	EOT_POLARITY				3
#define 	DACK_POLARITY				2
#define 	DREQ_POLARITY				1
#define 	DMA_ENABLE				0

#define RDK2_DMASTAT			0x84
#define 	GATHER_COUNT				12	/* 14:12 */
#define 	FIFO_COUNT				6	/* 11:6 */
#define 	FIFO_FLUSH				5
#define 	FIFO_TRANSFER				4
#define 	PAUSE_DONE				3
#define 	ABORT_DONE				2
#define 	DMA_ABORT				1
#define 	DMA_START				0

#define RDK2_DMAPCICOUNT		0x88
#define 	DMA_DIRECTION				31
#define 	DMA_PCI_BYTE_COUNT			0	/* 0:23 */

#define RDK2_DMALOCCOUNT		0x8C	/* 0:23 dma local byte count */

#define RDK2_DMAADDR			0x90	/* 2:31 PCI bus starting address */

/*---------------------------------------------------------------------------*/

#define REG_INDEXED_THRESHOLD	(1 << 5)

/* DRIVER DATA STRUCTURES and UTILITIES */
struct net2272_ep {
	struct usb_ep ep;
	struct net2272 *dev;
	unsigned long irqs;

	/* analogous to a host-side qh */
	struct list_head queue;
	const struct usb_endpoint_descriptor *desc;
	unsigned num:8,
	         fifo_size:12,
	         stopped:1,
	         wedged:1,
	         is_in:1,
	         is_iso:1,
	         dma:1,
	         not_empty:1;
};

struct net2272 {
	/* each device provides one gadget, several endpoints */
	struct usb_gadget gadget;
	struct device *dev;
	unsigned short dev_id;

	spinlock_t lock;
	struct net2272_ep ep[4];
	struct usb_gadget_driver *driver;
	unsigned protocol_stall:1,
	         softconnect:1,
	         wakeup:1,
	         dma_eot_polarity:1,
	         dma_dack_polarity:1,
	         dma_dreq_polarity:1,
	         dma_busy:1;
	u16 chiprev;
	u8 pagesel;

	unsigned int irq;
	unsigned short fifo_mode;

	unsigned int base_shift;
	u16 __iomem *base_addr;
	union {
#ifdef CONFIG_USB_PCI
		struct {
			void __iomem *plx9054_base_addr;
			void __iomem *epld_base_addr;
		} rdk1;
		struct {
			/* Bar0, Bar1 is base_addr both mem-mapped */
			void __iomem *fpga_base_addr;
		} rdk2;
#endif
	};
};

static void __iomem *
net2272_reg_addr(struct net2272 *dev, unsigned int reg)
{
	return dev->base_addr + (reg << dev->base_shift);
}

static void
net2272_write(struct net2272 *dev, unsigned int reg, u8 value)
{
	if (reg >= REG_INDEXED_THRESHOLD) {
		/*
		 * Indexed register; use REGADDRPTR/REGDATA
		 *  - Save and restore REGADDRPTR. This prevents REGADDRPTR from
		 *    changes between other code sections, but it is time consuming.
		 *  - Performance tips: either do not save and restore REGADDRPTR (if it
		 *    is safe) or do save/restore operations only in critical sections.
		u8 tmp = readb(dev->base_addr + REGADDRPTR);
		 */
		writeb((u8)reg, net2272_reg_addr(dev, REGADDRPTR));
		writeb(value, net2272_reg_addr(dev, REGDATA));
		/* writeb(tmp, net2272_reg_addr(dev, REGADDRPTR)); */
	} else
		writeb(value, net2272_reg_addr(dev, reg));
}

static u8
net2272_read(struct net2272 *dev, unsigned int reg)
{
	u8 ret;

	if (reg >= REG_INDEXED_THRESHOLD) {
		/*
		 * Indexed register; use REGADDRPTR/REGDATA
		 *  - Save and restore REGADDRPTR. This prevents REGADDRPTR from
		 *    changes between other code sections, but it is time consuming.
		 *  - Performance tips: either do not save and restore REGADDRPTR (if it
		 *    is safe) or do save/restore operations only in critical sections.
		u8 tmp = readb(dev->base_addr + REGADDRPTR);
		 */
		writeb((u8)reg, net2272_reg_addr(dev, REGADDRPTR));
		ret = readb(net2272_reg_addr(dev, REGDATA));
		/* writeb(tmp, net2272_reg_addr(dev, REGADDRPTR)); */
	} else
		ret = readb(net2272_reg_addr(dev, reg));

	return ret;
}

static void
net2272_ep_write(struct net2272_ep *ep, unsigned int reg, u8 value)
{
	struct net2272 *dev = ep->dev;

	if (dev->pagesel != ep->num) {
		net2272_write(dev, PAGESEL, ep->num);
		dev->pagesel = ep->num;
	}
	net2272_write(dev, reg, value);
}

static u8
net2272_ep_read(struct net2272_ep *ep, unsigned int reg)
{
	struct net2272 *dev = ep->dev;

	if (dev->pagesel != ep->num) {
		net2272_write(dev, PAGESEL, ep->num);
		dev->pagesel = ep->num;
	}
	return net2272_read(dev, reg);
}

static void allow_status(struct net2272_ep *ep)
{
	/* ep0 only */
	net2272_ep_write(ep, EP_RSPCLR,
		(1 << CONTROL_STATUS_PHASE_HANDSHAKE) |
		(1 << ALT_NAK_OUT_PACKETS) |
		(1 << NAK_OUT_PACKETS_MODE));
	ep->stopped = 1;
}

static void set_halt(struct net2272_ep *ep)
{
	/* ep0 and bulk/intr endpoints */
	net2272_ep_write(ep, EP_RSPCLR, 1 << CONTROL_STATUS_PHASE_HANDSHAKE);
	net2272_ep_write(ep, EP_RSPSET, 1 << ENDPOINT_HALT);
}

static void clear_halt(struct net2272_ep *ep)
{
	/* ep0 and bulk/intr endpoints */
	net2272_ep_write(ep, EP_RSPCLR,
		(1 << ENDPOINT_HALT) | (1 << ENDPOINT_TOGGLE));
}

/* count (<= 4) bytes in the next fifo write will be valid */
static void set_fifo_bytecount(struct net2272_ep *ep, unsigned count)
{
	/* net2272_ep_write will truncate to u8 for us */
	net2272_ep_write(ep, EP_TRANSFER2, count >> 16);
	net2272_ep_write(ep, EP_TRANSFER1, count >> 8);
	net2272_ep_write(ep, EP_TRANSFER0, count);
}

struct net2272_request {
	struct usb_request req;
	struct list_head queue;
	unsigned mapped:1,
	         valid:1;
};

#endif
Commit	Line	Data
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0+
ceb80363 SL	2	/*
	3	* PLX NET2272 high/full speed USB device controller
	4	*
	5	* Copyright (C) 2005-2006 PLX Technology, Inc.
	6	* Copyright (C) 2006-2011 Analog Devices, Inc.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22
	23	#ifndef __NET2272_H__
	24	#define __NET2272_H__
	25
	26	/* Main Registers */
	27	#define REGADDRPTR 0x00
	28	#define REGDATA 0x01
	29	#define IRQSTAT0 0x02
	30	#define ENDPOINT_0_INTERRUPT 0
	31	#define ENDPOINT_A_INTERRUPT 1
	32	#define ENDPOINT_B_INTERRUPT 2
	33	#define ENDPOINT_C_INTERRUPT 3
	34	#define VIRTUALIZED_ENDPOINT_INTERRUPT 4
	35	#define SETUP_PACKET_INTERRUPT 5
	36	#define DMA_DONE_INTERRUPT 6
	37	#define SOF_INTERRUPT 7
	38	#define IRQSTAT1 0x03
	39	#define CONTROL_STATUS_INTERRUPT 1
	40	#define VBUS_INTERRUPT 2
	41	#define SUSPEND_REQUEST_INTERRUPT 3
	42	#define SUSPEND_REQUEST_CHANGE_INTERRUPT 4
	43	#define RESUME_INTERRUPT 5
	44	#define ROOT_PORT_RESET_INTERRUPT 6
	45	#define RESET_STATUS 7
	46	#define PAGESEL 0x04
	47	#define DMAREQ 0x1c
	48	#define DMA_ENDPOINT_SELECT 0
	49	#define DREQ_POLARITY 1
	50	#define DACK_POLARITY 2
	51	#define EOT_POLARITY 3
	52	#define DMA_CONTROL_DACK 4
	53	#define DMA_REQUEST_ENABLE 5
	54	#define DMA_REQUEST 6
	55	#define DMA_BUFFER_VALID 7
	56	#define SCRATCH 0x1d
	57	#define IRQENB0 0x20
	58	#define ENDPOINT_0_INTERRUPT_ENABLE 0
	59	#define ENDPOINT_A_INTERRUPT_ENABLE 1
	60	#define ENDPOINT_B_INTERRUPT_ENABLE 2
	61	#define ENDPOINT_C_INTERRUPT_ENABLE 3
	62	#define VIRTUALIZED_ENDPOINT_INTERRUPT_ENABLE 4
	63	#define SETUP_PACKET_INTERRUPT_ENABLE 5
	64	#define DMA_DONE_INTERRUPT_ENABLE 6
	65	#define SOF_INTERRUPT_ENABLE 7
66	#define IRQENB1 0x21
67	#define VBUS_INTERRUPT_ENABLE 2
68	#define SUSPEND_REQUEST_INTERRUPT_ENABLE 3
69	#define SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE 4
70	#define RESUME_INTERRUPT_ENABLE 5
71	#define ROOT_PORT_RESET_INTERRUPT_ENABLE 6
72	#define LOCCTL 0x22
73	#define DATA_WIDTH 0
74	#define LOCAL_CLOCK_OUTPUT 1
75	#define LOCAL_CLOCK_OUTPUT_OFF 0
76	#define LOCAL_CLOCK_OUTPUT_3_75MHZ 1
77	#define LOCAL_CLOCK_OUTPUT_7_5MHZ 2
78	#define LOCAL_CLOCK_OUTPUT_15MHZ 3
79	#define LOCAL_CLOCK_OUTPUT_30MHZ 4
80	#define LOCAL_CLOCK_OUTPUT_60MHZ 5
81	#define DMA_SPLIT_BUS_MODE 4
82	#define BYTE_SWAP 5
83	#define BUFFER_CONFIGURATION 6
84	#define BUFFER_CONFIGURATION_EPA512_EPB512 0
85	#define BUFFER_CONFIGURATION_EPA1024_EPB512 1
86	#define BUFFER_CONFIGURATION_EPA1024_EPB1024 2
87	#define BUFFER_CONFIGURATION_EPA1024DB 3
88	#define CHIPREV_LEGACY 0x23
89	#define NET2270_LEGACY_REV 0x40
90	#define LOCCTL1 0x24
91	#define DMA_MODE 0
92	#define SLOW_DREQ 0
93	#define FAST_DREQ 1
94	#define BURST_MODE 2
95	#define DMA_DACK_ENABLE 2
96	#define CHIPREV_2272 0x25
97	#define CHIPREV_NET2272_R1 0x10
98	#define CHIPREV_NET2272_R1A 0x11
99	/* USB Registers */
100	#define USBCTL0 0x18
101	#define IO_WAKEUP_ENABLE 1
102	#define USB_DETECT_ENABLE 3
103	#define USB_ROOT_PORT_WAKEUP_ENABLE 5
104	#define USBCTL1 0x19
105	#define VBUS_PIN 0
106	#define USB_FULL_SPEED 1
107	#define USB_HIGH_SPEED 2
108	#define GENERATE_RESUME 3
109	#define VIRTUAL_ENDPOINT_ENABLE 4
110	#define FRAME0 0x1a
111	#define FRAME1 0x1b
112	#define OURADDR 0x30
113	#define FORCE_IMMEDIATE 7
114	#define USBDIAG 0x31
115	#define FORCE_TRANSMIT_CRC_ERROR 0
116	#define PREVENT_TRANSMIT_BIT_STUFF 1
117	#define FORCE_RECEIVE_ERROR 2
118	#define FAST_TIMES 4
119	#define USBTEST 0x32
120	#define TEST_MODE_SELECT 0
121	#define NORMAL_OPERATION 0
122	#define TEST_J 1
123	#define TEST_K 2
124	#define TEST_SE0_NAK 3
125	#define TEST_PACKET 4
126	#define TEST_FORCE_ENABLE 5
127	#define XCVRDIAG 0x33
128	#define FORCE_FULL_SPEED 2
129	#define FORCE_HIGH_SPEED 3
130	#define OPMODE 4
131	#define NORMAL_OPERATION 0
132	#define NON_DRIVING 1
133	#define DISABLE_BITSTUFF_AND_NRZI_ENCODE 2
134	#define LINESTATE 6
135	#define SE0_STATE 0
136	#define J_STATE 1
137	#define K_STATE 2
138	#define SE1_STATE 3
139	#define VIRTOUT0 0x34
140	#define VIRTOUT1 0x35
141	#define VIRTIN0 0x36
142	#define VIRTIN1 0x37
143	#define SETUP0 0x40
144	#define SETUP1 0x41
145	#define SETUP2 0x42
146	#define SETUP3 0x43
147	#define SETUP4 0x44
148	#define SETUP5 0x45
149	#define SETUP6 0x46
150	#define SETUP7 0x47
151	/* Endpoint Registers (Paged via PAGESEL) */
152	#define EP_DATA 0x05
153	#define EP_STAT0 0x06
154	#define DATA_IN_TOKEN_INTERRUPT 0
155	#define DATA_OUT_TOKEN_INTERRUPT 1
156	#define DATA_PACKET_TRANSMITTED_INTERRUPT 2
157	#define DATA_PACKET_RECEIVED_INTERRUPT 3
158	#define SHORT_PACKET_TRANSFERRED_INTERRUPT 4
159	#define NAK_OUT_PACKETS 5
160	#define BUFFER_EMPTY 6
161	#define BUFFER_FULL 7
162	#define EP_STAT1 0x07
163	#define TIMEOUT 0
164	#define USB_OUT_ACK_SENT 1
165	#define USB_OUT_NAK_SENT 2
166	#define USB_IN_ACK_RCVD 3
167	#define USB_IN_NAK_SENT 4
168	#define USB_STALL_SENT 5
169	#define LOCAL_OUT_ZLP 6
170	#define BUFFER_FLUSH 7
171	#define EP_TRANSFER0 0x08
172	#define EP_TRANSFER1 0x09
173	#define EP_TRANSFER2 0x0a
174	#define EP_IRQENB 0x0b
175	#define DATA_IN_TOKEN_INTERRUPT_ENABLE 0
176	#define DATA_OUT_TOKEN_INTERRUPT_ENABLE 1
177	#define DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE 2
178	#define DATA_PACKET_RECEIVED_INTERRUPT_ENABLE 3
179	#define SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE 4
180	#define EP_AVAIL0 0x0c
181	#define EP_AVAIL1 0x0d
182	#define EP_RSPCLR 0x0e
183	#define EP_RSPSET 0x0f
184	#define ENDPOINT_HALT 0
185	#define ENDPOINT_TOGGLE 1
186	#define NAK_OUT_PACKETS_MODE 2
187	#define CONTROL_STATUS_PHASE_HANDSHAKE 3
188	#define INTERRUPT_MODE 4
189	#define AUTOVALIDATE 5
190	#define HIDE_STATUS_PHASE 6
191	#define ALT_NAK_OUT_PACKETS 7
192	#define EP_MAXPKT0 0x28
193	#define EP_MAXPKT1 0x29
194	#define ADDITIONAL_TRANSACTION_OPPORTUNITIES 3
195	#define NONE_ADDITIONAL_TRANSACTION 0
196	#define ONE_ADDITIONAL_TRANSACTION 1
197	#define TWO_ADDITIONAL_TRANSACTION 2
198	#define EP_CFG 0x2a
199	#define ENDPOINT_NUMBER 0
200	#define ENDPOINT_DIRECTION 4
201	#define ENDPOINT_TYPE 5
202	#define ENDPOINT_ENABLE 7
203	#define EP_HBW 0x2b
204	#define HIGH_BANDWIDTH_OUT_TRANSACTION_PID 0
205	#define DATA0_PID 0
206	#define DATA1_PID 1
207	#define DATA2_PID 2
208	#define MDATA_PID 3
209	#define EP_BUFF_STATES 0x2c
210	#define BUFFER_A_STATE 0
211	#define BUFFER_B_STATE 2
212	#define BUFF_FREE 0
213	#define BUFF_VALID 1
214	#define BUFF_LCL 2
215	#define BUFF_USB 3
216
217	/---------------------------------------------------------------------------/
218
219	#define PCI_DEVICE_ID_RDK1 0x9054
220
221	/* PCI-RDK EPLD Registers */
222	#define RDK_EPLD_IO_REGISTER1 0x00000000
223	#define RDK_EPLD_USB_RESET 0
224	#define RDK_EPLD_USB_POWERDOWN 1
225	#define RDK_EPLD_USB_WAKEUP 2
226	#define RDK_EPLD_USB_EOT 3
227	#define RDK_EPLD_DPPULL 4
228	#define RDK_EPLD_IO_REGISTER2 0x00000004
229	#define RDK_EPLD_BUSWIDTH 0
230	#define RDK_EPLD_USER 2
231	#define RDK_EPLD_RESET_INTERRUPT_ENABLE 3
232	#define RDK_EPLD_DMA_TIMEOUT_ENABLE 4
233	#define RDK_EPLD_STATUS_REGISTER 0x00000008
234	#define RDK_EPLD_USB_LRESET 0
235	#define RDK_EPLD_REVISION_REGISTER 0x0000000c
236
237	/* PCI-RDK PLX 9054 Registers */
238	#define INTCSR 0x68
239	#define PCI_INTERRUPT_ENABLE 8
240	#define LOCAL_INTERRUPT_INPUT_ENABLE 11
241	#define LOCAL_INPUT_INTERRUPT_ACTIVE 15
242	#define LOCAL_DMA_CHANNEL_0_INTERRUPT_ENABLE 18
243	#define LOCAL_DMA_CHANNEL_1_INTERRUPT_ENABLE 19
244	#define DMA_CHANNEL_0_INTERRUPT_ACTIVE 21
245	#define DMA_CHANNEL_1_INTERRUPT_ACTIVE 22
246	#define CNTRL 0x6C
247	#define RELOAD_CONFIGURATION_REGISTERS 29
248	#define PCI_ADAPTER_SOFTWARE_RESET 30
249	#define DMAMODE0 0x80
250	#define LOCAL_BUS_WIDTH 0
251	#define INTERNAL_WAIT_STATES 2
252	#define TA_READY_INPUT_ENABLE 6
253	#define LOCAL_BURST_ENABLE 8
254	#define SCATTER_GATHER_MODE 9
255	#define DONE_INTERRUPT_ENABLE 10
256	#define LOCAL_ADDRESSING_MODE 11
257	#define DEMAND_MODE 12
258	#define DMA_EOT_ENABLE 14
259	#define FAST_SLOW_TERMINATE_MODE_SELECT 15
260	#define DMA_CHANNEL_INTERRUPT_SELECT 17
261	#define DMAPADR0 0x84
262	#define DMALADR0 0x88
263	#define DMASIZ0 0x8c
264	#define DMADPR0 0x90
265	#define DESCRIPTOR_LOCATION 0
266	#define END_OF_CHAIN 1
267	#define INTERRUPT_AFTER_TERMINAL_COUNT 2
268	#define DIRECTION_OF_TRANSFER 3
269	#define DMACSR0 0xa8
270	#define CHANNEL_ENABLE 0
271	#define CHANNEL_START 1
272	#define CHANNEL_ABORT 2
273	#define CHANNEL_CLEAR_INTERRUPT 3
274	#define CHANNEL_DONE 4
275	#define DMATHR 0xb0
276	#define LBRD1 0xf8
277	#define MEMORY_SPACE_LOCAL_BUS_WIDTH 0
278	#define W8_BIT 0
279	#define W16_BIT 1
280
281	/* Special OR'ing of INTCSR bits */
282	#define LOCAL_INTERRUPT_TEST \
283	((1 << LOCAL_INPUT_INTERRUPT_ACTIVE) \| \
284	(1 << LOCAL_INTERRUPT_INPUT_ENABLE))
285
286	#define DMA_CHANNEL_0_TEST \
287	((1 << DMA_CHANNEL_0_INTERRUPT_ACTIVE) \| \
288	(1 << LOCAL_DMA_CHANNEL_0_INTERRUPT_ENABLE))
289
290	#define DMA_CHANNEL_1_TEST \
291	((1 << DMA_CHANNEL_1_INTERRUPT_ACTIVE) \| \
292	(1 << LOCAL_DMA_CHANNEL_1_INTERRUPT_ENABLE))
293
294	/* EPLD Registers */
295	#define RDK_EPLD_IO_REGISTER1 0x00000000
296	#define RDK_EPLD_USB_RESET 0
297	#define RDK_EPLD_USB_POWERDOWN 1
298	#define RDK_EPLD_USB_WAKEUP 2
299	#define RDK_EPLD_USB_EOT 3
300	#define RDK_EPLD_DPPULL 4
301	#define RDK_EPLD_IO_REGISTER2 0x00000004
302	#define RDK_EPLD_BUSWIDTH 0
303	#define RDK_EPLD_USER 2
304	#define RDK_EPLD_RESET_INTERRUPT_ENABLE 3
305	#define RDK_EPLD_DMA_TIMEOUT_ENABLE 4
306	#define RDK_EPLD_STATUS_REGISTER 0x00000008
307	#define RDK_EPLD_USB_LRESET 0
308	#define RDK_EPLD_REVISION_REGISTER 0x0000000c
309
310	#define EPLD_IO_CONTROL_REGISTER 0x400
311	#define NET2272_RESET 0
312	#define BUSWIDTH 1
313	#define MPX_MODE 3
314	#define USER 4
315	#define DMA_TIMEOUT_ENABLE 5
316	#define DMA_CTL_DACK 6
317	#define EPLD_DMA_ENABLE 7
318	#define EPLD_DMA_CONTROL_REGISTER 0x800
319	#define SPLIT_DMA_MODE 0
320	#define SPLIT_DMA_DIRECTION 1
321	#define SPLIT_DMA_ENABLE 2
322	#define SPLIT_DMA_INTERRUPT_ENABLE 3
323	#define SPLIT_DMA_INTERRUPT 4
324	#define EPLD_DMA_MODE 5
325	#define EPLD_DMA_CONTROLLER_ENABLE 7
326	#define SPLIT_DMA_ADDRESS_LOW 0xc00
327	#define SPLIT_DMA_ADDRESS_HIGH 0x1000
328	#define SPLIT_DMA_BYTE_COUNT_LOW 0x1400
329	#define SPLIT_DMA_BYTE_COUNT_HIGH 0x1800
330	#define EPLD_REVISION_REGISTER 0x1c00
331	#define SPLIT_DMA_RAM 0x4000
332	#define DMA_RAM_SIZE 0x1000
333
334	/---------------------------------------------------------------------------/
335
336	#define PCI_DEVICE_ID_RDK2 0x3272
337
338	/* PCI-RDK version 2 registers */
339
340	/* Main Control Registers */
341
342	#define RDK2_IRQENB 0x00
343	#define RDK2_IRQSTAT 0x04
344	#define PB7 23
345	#define PB6 22
346	#define PB5 21
347	#define PB4 20
348	#define PB3 19
349	#define PB2 18
350	#define PB1 17
351	#define PB0 16
352	#define GP3 23
353	#define GP2 23
354	#define GP1 23
355	#define GP0 23
356	#define DMA_RETRY_ABORT 6
357	#define DMA_PAUSE_DONE 5
358	#define DMA_ABORT_DONE 4
359	#define DMA_OUT_FIFO_TRANSFER_DONE 3
360	#define DMA_LOCAL_DONE 2
361	#define DMA_PCI_DONE 1
362	#define NET2272_PCI_IRQ 0
363
364	#define RDK2_LOCCTLRDK 0x08
365	#define CHIP_RESET 3
366	#define SPLIT_DMA 2
367	#define MULTIPLEX_MODE 1
368	#define BUS_WIDTH 0
369
370	#define RDK2_GPIOCTL 0x10
371	#define GP3_OUT_ENABLE 7
372	#define GP2_OUT_ENABLE 6
373	#define GP1_OUT_ENABLE 5
374	#define GP0_OUT_ENABLE 4
375	#define GP3_DATA 3
376	#define GP2_DATA 2
377	#define GP1_DATA 1
378	#define GP0_DATA 0
379
380	#define RDK2_LEDSW 0x14
381	#define LED3 27
382	#define LED2 26
383	#define LED1 25
384	#define LED0 24
385	#define PBUTTON 16
386	#define DIPSW 0
387
388	#define RDK2_DIAG 0x18
389	#define RDK2_FAST_TIMES 2
390	#define FORCE_PCI_SERR 1
391	#define FORCE_PCI_INT 0
392	#define RDK2_FPGAREV 0x1C
393
394	/* Dma Control registers */
395	#define RDK2_DMACTL 0x80
396	#define ADDR_HOLD 24
397	#define RETRY_COUNT 16 /* 23:16 */
398	#define FIFO_THRESHOLD 11 /* 15:11 */
399	#define MEM_WRITE_INVALIDATE 10
400	#define READ_MULTIPLE 9
401	#define READ_LINE 8
402	#define RDK2_DMA_MODE 6 /* 7:6 */
403	#define CONTROL_DACK 5
404	#define EOT_ENABLE 4
405	#define EOT_POLARITY 3
406	#define DACK_POLARITY 2
407	#define DREQ_POLARITY 1
408	#define DMA_ENABLE 0
409
410	#define RDK2_DMASTAT 0x84
411	#define GATHER_COUNT 12 /* 14:12 */
412	#define FIFO_COUNT 6 /* 11:6 */
413	#define FIFO_FLUSH 5
414	#define FIFO_TRANSFER 4
415	#define PAUSE_DONE 3
416	#define ABORT_DONE 2
417	#define DMA_ABORT 1
418	#define DMA_START 0
419
420	#define RDK2_DMAPCICOUNT 0x88
421	#define DMA_DIRECTION 31
422	#define DMA_PCI_BYTE_COUNT 0 /* 0:23 */
423
424	#define RDK2_DMALOCCOUNT 0x8C /* 0:23 dma local byte count */
425
426	#define RDK2_DMAADDR 0x90 /* 2:31 PCI bus starting address */
427
428	/---------------------------------------------------------------------------/
429
430	#define REG_INDEXED_THRESHOLD (1 << 5)
431
432	/* DRIVER DATA STRUCTURES and UTILITIES */
433	struct net2272_ep {
434	struct usb_ep ep;
435	struct net2272 *dev;
436	unsigned long irqs;
437
438	/* analogous to a host-side qh */
439	struct list_head queue;
440	const struct usb_endpoint_descriptor *desc;
441	unsigned num:8,
442	fifo_size:12,
443	stopped:1,
444	wedged:1,
445	is_in:1,
446	is_iso:1,
447	dma:1,
448	not_empty:1;
449	};
450
451	struct net2272 {
452	/* each device provides one gadget, several endpoints */
453	struct usb_gadget gadget;
454	struct device *dev;
455	unsigned short dev_id;
456
457	spinlock_t lock;
458	struct net2272_ep ep[4];
459	struct usb_gadget_driver *driver;
460	unsigned protocol_stall:1,
461	softconnect:1,
ceb80363 SL	462	wakeup:1,
	463	dma_eot_polarity:1,
	464	dma_dack_polarity:1,
	465	dma_dreq_polarity:1,
	466	dma_busy:1;
	467	u16 chiprev;
	468	u8 pagesel;
	469
	470	unsigned int irq;
	471	unsigned short fifo_mode;
	472
	473	unsigned int base_shift;
	474	u16 __iomem *base_addr;
	475	union {
2c93e790	476	#ifdef CONFIG_USB_PCI
ceb80363 SL	477	struct {
	478	void __iomem *plx9054_base_addr;
	479	void __iomem *epld_base_addr;
	480	} rdk1;
	481	struct {
	482	/* Bar0, Bar1 is base_addr both mem-mapped */
	483	void __iomem *fpga_base_addr;
	484	} rdk2;
	485	#endif
	486	};
	487	};
	488
	489	static void __iomem *
	490	net2272_reg_addr(struct net2272 *dev, unsigned int reg)
	491	{
	492	return dev->base_addr + (reg << dev->base_shift);
	493	}
	494
	495	static void
	496	net2272_write(struct net2272 *dev, unsigned int reg, u8 value)
	497	{
	498	if (reg >= REG_INDEXED_THRESHOLD) {
	499	/*
	500	* Indexed register; use REGADDRPTR/REGDATA
	501	* - Save and restore REGADDRPTR. This prevents REGADDRPTR from
	502	* changes between other code sections, but it is time consuming.
	503	* - Performance tips: either do not save and restore REGADDRPTR (if it
	504	* is safe) or do save/restore operations only in critical sections.
	505	u8 tmp = readb(dev->base_addr + REGADDRPTR);
	506	*/
	507	writeb((u8)reg, net2272_reg_addr(dev, REGADDRPTR));
	508	writeb(value, net2272_reg_addr(dev, REGDATA));
	509	/* writeb(tmp, net2272_reg_addr(dev, REGADDRPTR)); */
	510	} else
	511	writeb(value, net2272_reg_addr(dev, reg));
	512	}
	513
	514	static u8
	515	net2272_read(struct net2272 *dev, unsigned int reg)
	516	{
	517	u8 ret;
	518
	519	if (reg >= REG_INDEXED_THRESHOLD) {
	520	/*
	521	* Indexed register; use REGADDRPTR/REGDATA
	522	* - Save and restore REGADDRPTR. This prevents REGADDRPTR from
	523	* changes between other code sections, but it is time consuming.
	524	* - Performance tips: either do not save and restore REGADDRPTR (if it
	525	* is safe) or do save/restore operations only in critical sections.
	526	u8 tmp = readb(dev->base_addr + REGADDRPTR);
	527	*/
	528	writeb((u8)reg, net2272_reg_addr(dev, REGADDRPTR));
	529	ret = readb(net2272_reg_addr(dev, REGDATA));
	530	/* writeb(tmp, net2272_reg_addr(dev, REGADDRPTR)); */
	531	} else
	532	ret = readb(net2272_reg_addr(dev, reg));
	533
	534	return ret;
	535	}
	536
	537	static void
	538	net2272_ep_write(struct net2272_ep *ep, unsigned int reg, u8 value)
	539	{
	540	struct net2272 *dev = ep->dev;
541
542	if (dev->pagesel != ep->num) {
543	net2272_write(dev, PAGESEL, ep->num);
544	dev->pagesel = ep->num;
545	}
546	net2272_write(dev, reg, value);
547	}
548
549	static u8
550	net2272_ep_read(struct net2272_ep *ep, unsigned int reg)
551	{
552	struct net2272 *dev = ep->dev;
553
554	if (dev->pagesel != ep->num) {
555	net2272_write(dev, PAGESEL, ep->num);
556	dev->pagesel = ep->num;
557	}
558	return net2272_read(dev, reg);
559	}
560
561	static void allow_status(struct net2272_ep *ep)
562	{
563	/* ep0 only */
564	net2272_ep_write(ep, EP_RSPCLR,
565	(1 << CONTROL_STATUS_PHASE_HANDSHAKE) \|
566	(1 << ALT_NAK_OUT_PACKETS) \|
567	(1 << NAK_OUT_PACKETS_MODE));
568	ep->stopped = 1;
569	}
570
571	static void set_halt(struct net2272_ep *ep)
572	{
573	/* ep0 and bulk/intr endpoints */
574	net2272_ep_write(ep, EP_RSPCLR, 1 << CONTROL_STATUS_PHASE_HANDSHAKE);
575	net2272_ep_write(ep, EP_RSPSET, 1 << ENDPOINT_HALT);
576	}
577
578	static void clear_halt(struct net2272_ep *ep)
579	{
580	/* ep0 and bulk/intr endpoints */
581	net2272_ep_write(ep, EP_RSPCLR,
582	(1 << ENDPOINT_HALT) \| (1 << ENDPOINT_TOGGLE));
583	}
584
585	/* count (<= 4) bytes in the next fifo write will be valid */
586	static void set_fifo_bytecount(struct net2272_ep *ep, unsigned count)
587	{
588	/* net2272_ep_write will truncate to u8 for us */
589	net2272_ep_write(ep, EP_TRANSFER2, count >> 16);
590	net2272_ep_write(ep, EP_TRANSFER1, count >> 8);
591	net2272_ep_write(ep, EP_TRANSFER0, count);
592	}
593
594	struct net2272_request {
595	struct usb_request req;
596	struct list_head queue;
597	unsigned mapped:1,
598	valid:1;
599	};
600
601	#endif