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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/net/cs8900.c
2 * Cirrus Logic CS8900A Ethernet
4 * (C) 2003 Wolfgang Denk, wd@denx.de
5 * Extension to synchronize ethaddr environment variable
6 * against value in EEPROM
9 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
10 * Marius Groeger <mgroeger@sysgo.de>
12 * Copyright (C) 1999 Ben Williamson <benw@pobox.com>
14 * See file CREDITS for list of people who contributed to this
17 * This program is loaded into SRAM in bootstrap mode, where it waits
18 * for commands on UART1 to read and write memory, jump to code etc.
19 * A design goal for this program is to be entirely independent of the
20 * target board. Anything with a CL-PS7111 or EP7211 should be able to run
21 * this code in bootstrap mode. All the board specifics can be handled on
24 * This program is free software; you can redistribute it and/or modify
25 * it under the terms of the GNU General Public License as published by
26 * the Free Software Foundation; either version 2 of the License, or
27 * (at your option) any later version.
29 * This program is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
32 * GNU General Public License for more details.
34 * You should have received a copy of the GNU General Public License
35 * along with this program; if not, write to the Free Software
36 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
46 /* packet page register access functions */
49 /* we don't need 16 bit initialisation on 32 bit bus */
50 #define get_reg_init_bus(x) get_reg((x))
52 static unsigned short get_reg_init_bus (int regno
)
54 /* force 16 bit busmode */
55 volatile unsigned char c
;
68 static unsigned short get_reg (int regno
)
75 static void put_reg (int regno
, unsigned short val
)
81 static void eth_reset (void)
87 put_reg (PP_SelfCTL
, get_reg (PP_SelfCTL
) | PP_SelfCTL_Reset
);
91 /* Wait until the chip is reset */
93 tmo
= get_timer (0) + 1 * CONFIG_SYS_HZ
;
94 while ((((us
= get_reg_init_bus (PP_SelfSTAT
)) & PP_SelfSTAT_InitD
) == 0)
95 && tmo
< get_timer (0))
99 static void eth_reginit (void)
101 /* receive only error free packets addressed to this card */
102 put_reg (PP_RxCTL
, PP_RxCTL_IA
| PP_RxCTL_Broadcast
| PP_RxCTL_RxOK
);
103 /* do not generate any interrupts on receive operations */
104 put_reg (PP_RxCFG
, 0);
105 /* do not generate any interrupts on transmit operations */
106 put_reg (PP_TxCFG
, 0);
107 /* do not generate any interrupts on buffer operations */
108 put_reg (PP_BufCFG
, 0);
109 /* enable transmitter/receiver mode */
110 put_reg (PP_LineCTL
, PP_LineCTL_Rx
| PP_LineCTL_Tx
);
113 void cs8900_get_enetaddr (void)
118 /* if the env is setup, then bail */
119 if (eth_getenv_enetaddr("ethaddr", enetaddr
))
123 if (get_reg_init_bus (PP_ChipID
) != 0x630e)
126 if ((get_reg (PP_SelfSTAT
) & (PP_SelfSTAT_EEPROM
| PP_SelfSTAT_EEPROM_OK
)) ==
127 (PP_SelfSTAT_EEPROM
| PP_SelfSTAT_EEPROM_OK
)) {
129 /* Load the MAC from EEPROM */
130 for (i
= 0; i
< 6 / 2; i
++) {
133 Addr
= get_reg (PP_IA
+ i
* 2);
134 enetaddr
[i
* 2] = Addr
& 0xFF;
135 enetaddr
[i
* 2 + 1] = Addr
>> 8;
138 eth_setenv_enetaddr("ethaddr", enetaddr
);
139 debug("### Set environment from HW MAC addr = \"%pM\"\n", enetaddr
);
145 /* disable transmitter/receiver mode */
146 put_reg (PP_LineCTL
, 0);
148 /* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */
149 get_reg_init_bus (PP_ChipID
);
152 int eth_init (bd_t
* bd
)
157 if (get_reg_init_bus (PP_ChipID
) != 0x630e) {
158 printf ("CS8900 Ethernet chip not found?!\n");
163 /* set the ethernet address */
164 eth_getenv_enetaddr("ethaddr", enetaddr
);
165 put_reg (PP_IA
+ 0, enetaddr
[0] | (enetaddr
[1] << 8));
166 put_reg (PP_IA
+ 2, enetaddr
[2] | (enetaddr
[3] << 8));
167 put_reg (PP_IA
+ 4, enetaddr
[4] | (enetaddr
[5] << 8));
173 /* Get a data block via Ethernet */
177 unsigned short rxlen
;
178 unsigned short *addr
;
179 unsigned short status
;
181 status
= get_reg (PP_RER
);
183 if ((status
& PP_RER_RxOK
) == 0)
186 status
= CS8900_RTDATA
; /* stat */
187 rxlen
= CS8900_RTDATA
; /* len */
190 if (rxlen
> PKTSIZE_ALIGN
+ PKTALIGN
)
191 printf ("packet too big!\n");
193 for (addr
= (unsigned short *) NetRxPackets
[0], i
= rxlen
>> 1; i
> 0;
195 *addr
++ = CS8900_RTDATA
;
197 *addr
++ = CS8900_RTDATA
;
199 /* Pass the packet up to the protocol layers. */
200 NetReceive (NetRxPackets
[0], rxlen
);
205 /* Send a data block via Ethernet. */
206 int eth_send (volatile void *packet
, int length
)
208 volatile unsigned short *addr
;
213 /* initiate a transmit sequence */
214 CS8900_TxCMD
= PP_TxCmd_TxStart_Full
;
215 CS8900_TxLEN
= length
;
217 /* Test to see if the chip has allocated memory for the packet */
218 if ((get_reg (PP_BusSTAT
) & PP_BusSTAT_TxRDY
) == 0) {
219 /* Oops... this should not happen! */
221 printf ("cs: unable to send packet; retrying...\n");
223 for (tmo
= get_timer (0) + 5 * CONFIG_SYS_HZ
; get_timer (0) < tmo
;)
230 /* Write the contents of the packet */
231 /* assume even number of bytes */
232 for (addr
= packet
; length
> 0; length
-= 2)
233 CS8900_RTDATA
= *addr
++;
235 /* wait for transfer to succeed */
236 tmo
= get_timer (0) + 5 * CONFIG_SYS_HZ
;
237 while ((s
= get_reg (PP_TER
) & ~0x1F) == 0) {
238 if (get_timer (0) >= tmo
)
243 if ((s
& (PP_TER_CRS
| PP_TER_TxOK
)) != PP_TER_TxOK
) {
245 printf ("\ntransmission error %#x\n", s
);
252 static void cs8900_e2prom_ready(void)
254 while (get_reg(PP_SelfSTAT
) & SI_BUSY
)
258 /***********************************************************/
259 /* read a 16-bit word out of the EEPROM */
260 /***********************************************************/
262 int cs8900_e2prom_read(unsigned char addr
, unsigned short *value
)
264 cs8900_e2prom_ready();
265 put_reg(PP_EECMD
, EEPROM_READ_CMD
| addr
);
266 cs8900_e2prom_ready();
267 *value
= get_reg(PP_EEData
);
273 /***********************************************************/
274 /* write a 16-bit word into the EEPROM */
275 /***********************************************************/
277 int cs8900_e2prom_write(unsigned char addr
, unsigned short value
)
279 cs8900_e2prom_ready();
280 put_reg(PP_EECMD
, EEPROM_WRITE_EN
);
281 cs8900_e2prom_ready();
282 put_reg(PP_EEData
, value
);
283 put_reg(PP_EECMD
, EEPROM_WRITE_CMD
| addr
);
284 cs8900_e2prom_ready();
285 put_reg(PP_EECMD
, EEPROM_WRITE_DIS
);
286 cs8900_e2prom_ready();