[people/ms/u-boot.git] / drivers / net / xilinx_emaclite.c

/******************************************************************************
 *
 * XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
 * AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
 * SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE,
 * OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
 * APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
 * THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
 * AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
 * FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY
 * WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
 * IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
 * REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
 * INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE.
 *
 * (C) Copyright 2007-2008 Michal Simek
 * Michal SIMEK <monstr@monstr.eu>
 *
 * (c) Copyright 2003 Xilinx Inc.
 * All rights reserved.
 *
 ******************************************************************************/

#include <common.h>
#include <net.h>
#include <config.h>
#include <asm/io.h>

#undef DEBUG

#define ENET_MAX_MTU		PKTSIZE
#define ENET_MAX_MTU_ALIGNED	PKTSIZE_ALIGN
#define ENET_ADDR_LENGTH	6

/* EmacLite constants */
#define XEL_BUFFER_OFFSET	0x0800	/* Next buffer's offset */
#define XEL_TPLR_OFFSET		0x07F4	/* Tx packet length */
#define XEL_TSR_OFFSET		0x07FC	/* Tx status */
#define XEL_RSR_OFFSET		0x17FC	/* Rx status */
#define XEL_RXBUFF_OFFSET	0x1000	/* Receive Buffer */

/* Xmit complete */
#define XEL_TSR_XMIT_BUSY_MASK		0x00000001UL
/* Xmit interrupt enable bit */
#define XEL_TSR_XMIT_IE_MASK		0x00000008UL
/* Buffer is active, SW bit only */
#define XEL_TSR_XMIT_ACTIVE_MASK	0x80000000UL
/* Program the MAC address */
#define XEL_TSR_PROGRAM_MASK		0x00000002UL
/* define for programming the MAC address into the EMAC Lite */
#define XEL_TSR_PROG_MAC_ADDR	(XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK)

/* Transmit packet length upper byte */
#define XEL_TPLR_LENGTH_MASK_HI		0x0000FF00UL
/* Transmit packet length lower byte */
#define XEL_TPLR_LENGTH_MASK_LO		0x000000FFUL

/* Recv complete */
#define XEL_RSR_RECV_DONE_MASK		0x00000001UL
/* Recv interrupt enable bit */
#define XEL_RSR_RECV_IE_MASK		0x00000008UL

typedef struct {
	unsigned int baseaddress;	/* Base address for device (IPIF) */
	unsigned int nexttxbuffertouse;	/* Next TX buffer to write to */
	unsigned int nextrxbuffertouse;	/* Next RX buffer to read from */
	unsigned char deviceid;		/* Unique ID of device - for future */
} xemaclite;

static xemaclite emaclite;

static char etherrxbuff[PKTSIZE_ALIGN/4]; /* Receive buffer */

/* hardcoded MAC address for the Xilinx EMAC Core when env is nowhere*/
#ifdef CFG_ENV_IS_NOWHERE
static u8 emacaddr[ENET_ADDR_LENGTH] = { 0x00, 0x0a, 0x35, 0x00, 0x22, 0x01 };
#else
static u8 emacaddr[ENET_ADDR_LENGTH];
#endif

void xemaclite_alignedread (u32 * srcptr, void *destptr, unsigned bytecount)
{
	unsigned int i;
	u32 alignbuffer;
	u32 *to32ptr;
	u32 *from32ptr;
	u8 *to8ptr;
	u8 *from8ptr;

	from32ptr = (u32 *) srcptr;

	/* Word aligned buffer, no correction needed. */
	to32ptr = (u32 *) destptr;
	while (bytecount > 3) {
		*to32ptr++ = *from32ptr++;
		bytecount -= 4;
	}
	to8ptr = (u8 *) to32ptr;

	alignbuffer = *from32ptr++;
	from8ptr = (u8 *) & alignbuffer;

	for (i = 0; i < bytecount; i++) {
		*to8ptr++ = *from8ptr++;
	}
}

void xemaclite_alignedwrite (void *srcptr, u32 destptr, unsigned bytecount)
{
	unsigned i;
	u32 alignbuffer;
	u32 *to32ptr = (u32 *) destptr;
	u32 *from32ptr;
	u8 *to8ptr;
	u8 *from8ptr;

	from32ptr = (u32 *) srcptr;
	while (bytecount > 3) {

		*to32ptr++ = *from32ptr++;
		bytecount -= 4;
	}

	alignbuffer = 0;
	to8ptr = (u8 *) & alignbuffer;
	from8ptr = (u8 *) from32ptr;

	for (i = 0; i < bytecount; i++) {
		*to8ptr++ = *from8ptr++;
	}

	*to32ptr++ = alignbuffer;
}

void eth_halt (void)
{
	debug ("eth_halt\n");
}

int eth_init (bd_t * bis)
{
	debug ("EmacLite Initialization Started\n");
	memset (&emaclite, 0, sizeof (xemaclite));
	emaclite.baseaddress = XILINX_EMACLITE_BASEADDR;

	if (!getenv("ethaddr")) {
		memcpy(bis->bi_enetaddr, emacaddr, ENET_ADDR_LENGTH);
	}

/*
 * TX - TX_PING & TX_PONG initialization
 */
	/* Restart PING TX */
	out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, 0);
	/* Copy MAC address */
	xemaclite_alignedwrite (bis->bi_enetaddr,
		emaclite.baseaddress, ENET_ADDR_LENGTH);
	/* Set the length */
	out_be32 (emaclite.baseaddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
	/* Update the MAC address in the EMAC Lite */
	out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, XEL_TSR_PROG_MAC_ADDR);
	/* Wait for EMAC Lite to finish with the MAC address update */
	while ((in_be32 (emaclite.baseaddress + XEL_TSR_OFFSET) &
		XEL_TSR_PROG_MAC_ADDR) != 0) ;

#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
	/* The same operation with PONG TX */
	out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET, 0);
	xemaclite_alignedwrite (bis->bi_enetaddr, emaclite.baseaddress +
		XEL_BUFFER_OFFSET, ENET_ADDR_LENGTH);
	out_be32 (emaclite.baseaddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
	out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET,
		XEL_TSR_PROG_MAC_ADDR);
	while ((in_be32 (emaclite.baseaddress + XEL_TSR_OFFSET +
		XEL_BUFFER_OFFSET) & XEL_TSR_PROG_MAC_ADDR) != 0) ;
#endif

/*
 * RX - RX_PING & RX_PONG initialization
 */
	/* Write out the value to flush the RX buffer */
	out_be32 (emaclite.baseaddress + XEL_RSR_OFFSET, XEL_RSR_RECV_IE_MASK);
#ifdef CONFIG_XILINX_EMACLITE_RX_PING_PONG
	out_be32 (emaclite.baseaddress + XEL_RSR_OFFSET + XEL_BUFFER_OFFSET,
		XEL_RSR_RECV_IE_MASK);
#endif

	debug ("EmacLite Initialization complete\n");
	return 0;
}

int xemaclite_txbufferavailable (xemaclite * instanceptr)
{
	u32 reg;
	u32 txpingbusy;
	u32 txpongbusy;
	/*
	 * Read the other buffer register
	 * and determine if the other buffer is available
	 */
	reg = in_be32 (instanceptr->baseaddress +
			instanceptr->nexttxbuffertouse + 0);
	txpingbusy = ((reg & XEL_TSR_XMIT_BUSY_MASK) ==
			XEL_TSR_XMIT_BUSY_MASK);

	reg = in_be32 (instanceptr->baseaddress +
			(instanceptr->nexttxbuffertouse ^ XEL_TSR_OFFSET) + 0);
	txpongbusy = ((reg & XEL_TSR_XMIT_BUSY_MASK) ==
			XEL_TSR_XMIT_BUSY_MASK);

	return (!(txpingbusy && txpongbusy));
}

int eth_send (volatile void *ptr, int len) {

	unsigned int reg;
	unsigned int baseaddress;

	unsigned maxtry = 1000;

	if (len > ENET_MAX_MTU)
		len = ENET_MAX_MTU;

	while (!xemaclite_txbufferavailable (&emaclite) && maxtry) {
		udelay (10);
		maxtry--;
	}

	if (!maxtry) {
		printf ("Error: Timeout waiting for ethernet TX buffer\n");
		/* Restart PING TX */
		out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, 0);
#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
		out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET +
		XEL_BUFFER_OFFSET, 0);
#endif
		return 0;
	}

	/* Determine the expected TX buffer address */
	baseaddress = (emaclite.baseaddress + emaclite.nexttxbuffertouse);

	/* Determine if the expected buffer address is empty */
	reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
	if (((reg & XEL_TSR_XMIT_BUSY_MASK) == 0)
		&& ((in_be32 ((baseaddress) + XEL_TSR_OFFSET)
			& XEL_TSR_XMIT_ACTIVE_MASK) == 0)) {

#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
		emaclite.nexttxbuffertouse ^= XEL_BUFFER_OFFSET;
#endif
		debug ("Send packet from 0x%x\n", baseaddress);
		/* Write the frame to the buffer */
		xemaclite_alignedwrite ((void *) ptr, baseaddress, len);
		out_be32 (baseaddress + XEL_TPLR_OFFSET,(len &
			(XEL_TPLR_LENGTH_MASK_HI | XEL_TPLR_LENGTH_MASK_LO)));
		reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
		reg |= XEL_TSR_XMIT_BUSY_MASK;
		if ((reg & XEL_TSR_XMIT_IE_MASK) != 0) {
			reg |= XEL_TSR_XMIT_ACTIVE_MASK;
		}
		out_be32 (baseaddress + XEL_TSR_OFFSET, reg);
		return 1;
	}
#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
	/* Switch to second buffer */
	baseaddress ^= XEL_BUFFER_OFFSET;
	/* Determine if the expected buffer address is empty */
	reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
	if (((reg & XEL_TSR_XMIT_BUSY_MASK) == 0)
		&& ((in_be32 ((baseaddress) + XEL_TSR_OFFSET)
			& XEL_TSR_XMIT_ACTIVE_MASK) == 0)) {
		debug ("Send packet from 0x%x\n", baseaddress);
		/* Write the frame to the buffer */
		xemaclite_alignedwrite ((void *) ptr, baseaddress, len);
		out_be32 (baseaddress + XEL_TPLR_OFFSET,(len &
			(XEL_TPLR_LENGTH_MASK_HI | XEL_TPLR_LENGTH_MASK_LO)));
		reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
		reg |= XEL_TSR_XMIT_BUSY_MASK;
		if ((reg & XEL_TSR_XMIT_IE_MASK) != 0) {
			reg |= XEL_TSR_XMIT_ACTIVE_MASK;
		}
		out_be32 (baseaddress + XEL_TSR_OFFSET, reg);
		return 1;
	}
#endif
	puts ("Error while sending frame\n");
	return 0;
}

int eth_rx (void)
{
	unsigned int length;
	unsigned int reg;
	unsigned int baseaddress;

	baseaddress = emaclite.baseaddress + emaclite.nextrxbuffertouse;
	reg = in_be32 (baseaddress + XEL_RSR_OFFSET);
	debug ("Testing data at address 0x%x\n", baseaddress);
	if ((reg & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
#ifdef CONFIG_XILINX_EMACLITE_RX_PING_PONG
		emaclite.nextrxbuffertouse ^= XEL_BUFFER_OFFSET;
#endif
	} else {
#ifndef CONFIG_XILINX_EMACLITE_RX_PING_PONG
		debug ("No data was available - address 0x%x\n", baseaddress);
		return 0;
#else
		baseaddress ^= XEL_BUFFER_OFFSET;
		reg = in_be32 (baseaddress + XEL_RSR_OFFSET);
		if ((reg & XEL_RSR_RECV_DONE_MASK) !=
					XEL_RSR_RECV_DONE_MASK) {
			debug ("No data was available - address 0x%x\n",
					baseaddress);
			return 0;
		}
#endif
	}
	/* Get the length of the frame that arrived */
	switch(((in_be32 (baseaddress + XEL_RXBUFF_OFFSET + 0xC)) &
			0xFFFF0000 ) >> 16) {
		case 0x806:
			length = 42 + 20; /* FIXME size of ARP */
			debug ("ARP Packet\n");
			break;
		case 0x800:
			length = 14 + 14 +
			(((in_be32 (baseaddress + XEL_RXBUFF_OFFSET + 0x10)) &
			0xFFFF0000) >> 16); /* FIXME size of IP packet */
			debug ("IP Packet\n");
			break;
		default:
			debug ("Other Packet\n");
			length = ENET_MAX_MTU;
			break;
	}

	xemaclite_alignedread ((u32 *) (baseaddress + XEL_RXBUFF_OFFSET),
			etherrxbuff, length);

	/* Acknowledge the frame */
	reg = in_be32 (baseaddress + XEL_RSR_OFFSET);
	reg &= ~XEL_RSR_RECV_DONE_MASK;
	out_be32 (baseaddress + XEL_RSR_OFFSET, reg);

	debug ("Packet receive from 0x%x, length %dB\n", baseaddress, length);
	NetReceive ((uchar *) etherrxbuff, length);
	return 1;

}
Commit	Line	Data
89c53891 MS	1	/******************************************************************************
	2	*
	3	* XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
	4	* AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
	5	* SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE,
	6	* OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
	7	* APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
	8	* THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
	9	* AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
	10	* FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY
	11	* WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
	12	* IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
	13	* REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
	14	* INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
	15	* FOR A PARTICULAR PURPOSE.
	16	*
	17	* (C) Copyright 2007-2008 Michal Simek
	18	* Michal SIMEK <monstr@monstr.eu>
	19	*
	20	* (c) Copyright 2003 Xilinx Inc.
	21	* All rights reserved.
	22	*
	23	******************************************************************************/
	24
	25	#include <common.h>
	26	#include <net.h>
	27	#include <config.h>
	28	#include <asm/io.h>
	29
	30	#undef DEBUG
	31
	32	#define ENET_MAX_MTU PKTSIZE
	33	#define ENET_MAX_MTU_ALIGNED PKTSIZE_ALIGN
	34	#define ENET_ADDR_LENGTH 6
	35
	36	/* EmacLite constants */
	37	#define XEL_BUFFER_OFFSET 0x0800 /* Next buffer's offset */
	38	#define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */
	39	#define XEL_TSR_OFFSET 0x07FC /* Tx status */
	40	#define XEL_RSR_OFFSET 0x17FC /* Rx status */
	41	#define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */
	42
	43	/* Xmit complete */
	44	#define XEL_TSR_XMIT_BUSY_MASK 0x00000001UL
	45	/* Xmit interrupt enable bit */
	46	#define XEL_TSR_XMIT_IE_MASK 0x00000008UL
	47	/* Buffer is active, SW bit only */
	48	#define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000UL
	49	/* Program the MAC address */
	50	#define XEL_TSR_PROGRAM_MASK 0x00000002UL
	51	/* define for programming the MAC address into the EMAC Lite */
	52	#define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK \| XEL_TSR_PROGRAM_MASK)
	53
	54	/* Transmit packet length upper byte */
	55	#define XEL_TPLR_LENGTH_MASK_HI 0x0000FF00UL
	56	/* Transmit packet length lower byte */
	57	#define XEL_TPLR_LENGTH_MASK_LO 0x000000FFUL
	58
	59	/* Recv complete */
	60	#define XEL_RSR_RECV_DONE_MASK 0x00000001UL
	61	/* Recv interrupt enable bit */
	62	#define XEL_RSR_RECV_IE_MASK 0x00000008UL
	63
	64	typedef struct {
65	unsigned int baseaddress; /* Base address for device (IPIF) */
66	unsigned int nexttxbuffertouse; /* Next TX buffer to write to */
67	unsigned int nextrxbuffertouse; /* Next RX buffer to read from */
68	unsigned char deviceid; /* Unique ID of device - for future */
69	} xemaclite;
70
71	static xemaclite emaclite;
72
73	static char etherrxbuff[PKTSIZE_ALIGN/4]; /* Receive buffer */
74
75	/* hardcoded MAC address for the Xilinx EMAC Core when env is nowhere*/
76	#ifdef CFG_ENV_IS_NOWHERE
77	static u8 emacaddr[ENET_ADDR_LENGTH] = { 0x00, 0x0a, 0x35, 0x00, 0x22, 0x01 };
78	#else
79	static u8 emacaddr[ENET_ADDR_LENGTH];
80	#endif
81
82	void xemaclite_alignedread (u32 * srcptr, void *destptr, unsigned bytecount)
83	{
84	unsigned int i;
85	u32 alignbuffer;
86	u32 *to32ptr;
87	u32 *from32ptr;
88	u8 *to8ptr;
89	u8 *from8ptr;
90
91	from32ptr = (u32 *) srcptr;
92
93	/* Word aligned buffer, no correction needed. */
94	to32ptr = (u32 *) destptr;
95	while (bytecount > 3) {
96	to32ptr++ = from32ptr++;
97	bytecount -= 4;
98	}
99	to8ptr = (u8 *) to32ptr;
100
101	alignbuffer = *from32ptr++;
102	from8ptr = (u8 *) & alignbuffer;
103
104	for (i = 0; i < bytecount; i++) {
105	to8ptr++ = from8ptr++;
106	}
107	}
108
109	void xemaclite_alignedwrite (void *srcptr, u32 destptr, unsigned bytecount)
110	{
111	unsigned i;
112	u32 alignbuffer;
113	u32 to32ptr = (u32 ) destptr;
114	u32 *from32ptr;
115	u8 *to8ptr;
116	u8 *from8ptr;
117
118	from32ptr = (u32 *) srcptr;
119	while (bytecount > 3) {
120
121	to32ptr++ = from32ptr++;
122	bytecount -= 4;
123	}
124
125	alignbuffer = 0;
126	to8ptr = (u8 *) & alignbuffer;
127	from8ptr = (u8 *) from32ptr;
128
129	for (i = 0; i < bytecount; i++) {
130	to8ptr++ = from8ptr++;
131	}
132
133	*to32ptr++ = alignbuffer;
134	}
135
136	void eth_halt (void)
137	{
138	debug ("eth_halt\n");
139	}
140
141	int eth_init (bd_t * bis)
142	{
143	debug ("EmacLite Initialization Started\n");
144	memset (&emaclite, 0, sizeof (xemaclite));
145	emaclite.baseaddress = XILINX_EMACLITE_BASEADDR;
146
147	if (!getenv("ethaddr")) {
148	memcpy(bis->bi_enetaddr, emacaddr, ENET_ADDR_LENGTH);
149	}
150
151	/*
152	* TX - TX_PING & TX_PONG initialization
153	*/
154	/* Restart PING TX */
155	out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, 0);
156	/* Copy MAC address */
157	xemaclite_alignedwrite (bis->bi_enetaddr,
158	emaclite.baseaddress, ENET_ADDR_LENGTH);
159	/* Set the length */
160	out_be32 (emaclite.baseaddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
161	/* Update the MAC address in the EMAC Lite */
162	out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, XEL_TSR_PROG_MAC_ADDR);
163	/* Wait for EMAC Lite to finish with the MAC address update */
164	while ((in_be32 (emaclite.baseaddress + XEL_TSR_OFFSET) &
165	XEL_TSR_PROG_MAC_ADDR) != 0) ;
166
167	#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
168	/* The same operation with PONG TX */
169	out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET, 0);
170	xemaclite_alignedwrite (bis->bi_enetaddr, emaclite.baseaddress +
171	XEL_BUFFER_OFFSET, ENET_ADDR_LENGTH);
172	out_be32 (emaclite.baseaddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
173	out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET,
174	XEL_TSR_PROG_MAC_ADDR);
175	while ((in_be32 (emaclite.baseaddress + XEL_TSR_OFFSET +
176	XEL_BUFFER_OFFSET) & XEL_TSR_PROG_MAC_ADDR) != 0) ;
177	#endif
178
179	/*
180	* RX - RX_PING & RX_PONG initialization
181	*/
182	/* Write out the value to flush the RX buffer */
183	out_be32 (emaclite.baseaddress + XEL_RSR_OFFSET, XEL_RSR_RECV_IE_MASK);
184	#ifdef CONFIG_XILINX_EMACLITE_RX_PING_PONG
185	out_be32 (emaclite.baseaddress + XEL_RSR_OFFSET + XEL_BUFFER_OFFSET,
186	XEL_RSR_RECV_IE_MASK);
187	#endif
188
189	debug ("EmacLite Initialization complete\n");
190	return 0;
191	}
192
193	int xemaclite_txbufferavailable (xemaclite * instanceptr)
194	{
195	u32 reg;
196	u32 txpingbusy;
197	u32 txpongbusy;
198	/*
199	* Read the other buffer register
200	* and determine if the other buffer is available
201	*/
202	reg = in_be32 (instanceptr->baseaddress +
203	instanceptr->nexttxbuffertouse + 0);
204	txpingbusy = ((reg & XEL_TSR_XMIT_BUSY_MASK) ==
205	XEL_TSR_XMIT_BUSY_MASK);
206
207	reg = in_be32 (instanceptr->baseaddress +
208	(instanceptr->nexttxbuffertouse ^ XEL_TSR_OFFSET) + 0);
209	txpongbusy = ((reg & XEL_TSR_XMIT_BUSY_MASK) ==
210	XEL_TSR_XMIT_BUSY_MASK);
211
212	return (!(txpingbusy && txpongbusy));
213	}
214
215	int eth_send (volatile void *ptr, int len) {
216
217	unsigned int reg;
218	unsigned int baseaddress;
219
220	unsigned maxtry = 1000;
221
222	if (len > ENET_MAX_MTU)
223	len = ENET_MAX_MTU;
224
225	while (!xemaclite_txbufferavailable (&emaclite) && maxtry) {
226	udelay (10);
227	maxtry--;
228	}
229
230	if (!maxtry) {
231	printf ("Error: Timeout waiting for ethernet TX buffer\n");
232	/* Restart PING TX */
233	out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, 0);
234	#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
235	out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET +
236	XEL_BUFFER_OFFSET, 0);
237	#endif
238	return 0;
239	}
240
241	/* Determine the expected TX buffer address */
242	baseaddress = (emaclite.baseaddress + emaclite.nexttxbuffertouse);
243
244	/* Determine if the expected buffer address is empty */
245	reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
246	if (((reg & XEL_TSR_XMIT_BUSY_MASK) == 0)
247	&& ((in_be32 ((baseaddress) + XEL_TSR_OFFSET)
248	& XEL_TSR_XMIT_ACTIVE_MASK) == 0)) {
249
250	#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
251	emaclite.nexttxbuffertouse ^= XEL_BUFFER_OFFSET;
252	#endif
253	debug ("Send packet from 0x%x\n", baseaddress);
254	/* Write the frame to the buffer */
255	xemaclite_alignedwrite ((void *) ptr, baseaddress, len);
256	out_be32 (baseaddress + XEL_TPLR_OFFSET,(len &
257	(XEL_TPLR_LENGTH_MASK_HI \| XEL_TPLR_LENGTH_MASK_LO)));
258	reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
259	reg \|= XEL_TSR_XMIT_BUSY_MASK;
260	if ((reg & XEL_TSR_XMIT_IE_MASK) != 0) {
261	reg \|= XEL_TSR_XMIT_ACTIVE_MASK;
262	}
263	out_be32 (baseaddress + XEL_TSR_OFFSET, reg);
264	return 1;
265	}
266	#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
267	/* Switch to second buffer */
268	baseaddress ^= XEL_BUFFER_OFFSET;
269	/* Determine if the expected buffer address is empty */
270	reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
271	if (((reg & XEL_TSR_XMIT_BUSY_MASK) == 0)
272	&& ((in_be32 ((baseaddress) + XEL_TSR_OFFSET)
273	& XEL_TSR_XMIT_ACTIVE_MASK) == 0)) {
274	debug ("Send packet from 0x%x\n", baseaddress);
275	/* Write the frame to the buffer */
276	xemaclite_alignedwrite ((void *) ptr, baseaddress, len);
277	out_be32 (baseaddress + XEL_TPLR_OFFSET,(len &
278	(XEL_TPLR_LENGTH_MASK_HI \| XEL_TPLR_LENGTH_MASK_LO)));
279	reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
280	reg \|= XEL_TSR_XMIT_BUSY_MASK;
281	if ((reg & XEL_TSR_XMIT_IE_MASK) != 0) {
282	reg \|= XEL_TSR_XMIT_ACTIVE_MASK;
283	}
284	out_be32 (baseaddress + XEL_TSR_OFFSET, reg);
285	return 1;
286	}
287	#endif
288	puts ("Error while sending frame\n");
289	return 0;
290	}
291
292	int eth_rx (void)
293	{
294	unsigned int length;
295	unsigned int reg;
296	unsigned int baseaddress;
297
298	baseaddress = emaclite.baseaddress + emaclite.nextrxbuffertouse;
299	reg = in_be32 (baseaddress + XEL_RSR_OFFSET);
300	debug ("Testing data at address 0x%x\n", baseaddress);
301	if ((reg & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
302	#ifdef CONFIG_XILINX_EMACLITE_RX_PING_PONG
303	emaclite.nextrxbuffertouse ^= XEL_BUFFER_OFFSET;
304	#endif
305	} else {
306	#ifndef CONFIG_XILINX_EMACLITE_RX_PING_PONG
307	debug ("No data was available - address 0x%x\n", baseaddress);
308	return 0;
309	#else
310	baseaddress ^= XEL_BUFFER_OFFSET;
311	reg = in_be32 (baseaddress + XEL_RSR_OFFSET);
312	if ((reg & XEL_RSR_RECV_DONE_MASK) !=
313	XEL_RSR_RECV_DONE_MASK) {
314	debug ("No data was available - address 0x%x\n",
315	baseaddress);
316	return 0;
317	}
318	#endif
319	}
320	/* Get the length of the frame that arrived */
321	switch(((in_be32 (baseaddress + XEL_RXBUFF_OFFSET + 0xC)) &
322	0xFFFF0000 ) >> 16) {
323	case 0x806:
324	length = 42 + 20; /* FIXME size of ARP */
325	debug ("ARP Packet\n");
326	break;
327	case 0x800:
328	length = 14 + 14 +
329	(((in_be32 (baseaddress + XEL_RXBUFF_OFFSET + 0x10)) &
330	0xFFFF0000) >> 16); /* FIXME size of IP packet */
331	debug ("IP Packet\n");
332	break;
333	default:
334	debug ("Other Packet\n");
335	length = ENET_MAX_MTU;
336	break;
337	}
338
339	xemaclite_alignedread ((u32 *) (baseaddress + XEL_RXBUFF_OFFSET),
340	etherrxbuff, length);
341
342	/* Acknowledge the frame */
343	reg = in_be32 (baseaddress + XEL_RSR_OFFSET);
344	reg &= ~XEL_RSR_RECV_DONE_MASK;
345	out_be32 (baseaddress + XEL_RSR_OFFSET, reg);
346
347	debug ("Packet receive from 0x%x, length %dB\n", baseaddress, length);
348	NetReceive ((uchar *) etherrxbuff, length);
349	return 1;
350
351	}