1 /* 2 * Cirrus Logic CS8900A Ethernet 3 * 4 * (C) 2003 Wolfgang Denk, wd@denx.de 5 * Extension to synchronize ethaddr environment variable 6 * against value in EEPROM 7 * 8 * (C) Copyright 2002 9 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 10 * Marius Groeger <mgroeger@sysgo.de> 11 * 12 * Copyright (C) 1999 Ben Williamson <benw@pobox.com> 13 * 14 * See file CREDITS for list of people who contributed to this 15 * project. 16 * 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 22 * the host. 23 * 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. 28 * 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. 33 * 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. 37 */ 38 39 #include <common.h> 40 #include <command.h> 41 #include "cs8900.h" 42 #include <net.h> 43 44 #undef DEBUG 45 46 /* packet page register access functions */ 47 48 #ifdef CS8900_BUS32 49 /* we don't need 16 bit initialisation on 32 bit bus */ 50 #define get_reg_init_bus(x) get_reg((x)) 51 #else 52 static unsigned short get_reg_init_bus (int regno) 53 { 54 /* force 16 bit busmode */ 55 volatile unsigned char c; 56 57 c = CS8900_BUS16_0; 58 c = CS8900_BUS16_1; 59 c = CS8900_BUS16_0; 60 c = CS8900_BUS16_1; 61 c = CS8900_BUS16_0; 62 63 CS8900_PPTR = regno; 64 return CS8900_PDATA; 65 } 66 #endif 67 68 static unsigned short get_reg (int regno) 69 { 70 CS8900_PPTR = regno; 71 return CS8900_PDATA; 72 } 73 74 75 static void put_reg (int regno, unsigned short val) 76 { 77 CS8900_PPTR = regno; 78 CS8900_PDATA = val; 79 } 80 81 static void eth_reset (void) 82 { 83 int tmo; 84 unsigned short us; 85 86 /* reset NIC */ 87 put_reg (PP_SelfCTL, get_reg (PP_SelfCTL) | PP_SelfCTL_Reset); 88 89 /* wait for 200ms */ 90 udelay (200000); 91 /* Wait until the chip is reset */ 92 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)) 96 /*NOP*/; 97 } 98 99 static void eth_reginit (void) 100 { 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); 111 } 112 113 void cs8900_get_enetaddr (uchar * addr) 114 { 115 int i; 116 unsigned char env_enetaddr[6]; 117 char *tmp = getenv ("ethaddr"); 118 char *end; 119 120 for (i=0; i<6; i++) { 121 env_enetaddr[i] = tmp ? simple_strtoul(tmp, &end, 16) : 0; 122 if (tmp) 123 tmp = (*end) ? end+1 : end; 124 } 125 126 /* verify chip id */ 127 if (get_reg_init_bus (PP_ChipID) != 0x630e) 128 return; 129 eth_reset (); 130 if ((get_reg (PP_SelfSTAT) & (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) == 131 (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) { 132 133 /* Load the MAC from EEPROM */ 134 for (i = 0; i < 6 / 2; i++) { 135 unsigned int Addr; 136 137 Addr = get_reg (PP_IA + i * 2); 138 addr[i * 2] = Addr & 0xFF; 139 addr[i * 2 + 1] = Addr >> 8; 140 } 141 142 if (memcmp(env_enetaddr, "\0\0\0\0\0\0", 6) != 0 && 143 memcmp(env_enetaddr, addr, 6) != 0) { 144 printf ("\nWarning: MAC addresses don't match:\n"); 145 printf ("\tHW MAC address: " 146 "%02X:%02X:%02X:%02X:%02X:%02X\n", 147 addr[0], addr[1], 148 addr[2], addr[3], 149 addr[4], addr[5] ); 150 printf ("\t\"ethaddr\" value: " 151 "%02X:%02X:%02X:%02X:%02X:%02X\n", 152 env_enetaddr[0], env_enetaddr[1], 153 env_enetaddr[2], env_enetaddr[3], 154 env_enetaddr[4], env_enetaddr[5]) ; 155 debug ("### Set MAC addr from environment\n"); 156 memcpy (addr, env_enetaddr, 6); 157 } 158 if (!tmp) { 159 char ethaddr[20]; 160 sprintf (ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X", 161 addr[0], addr[1], 162 addr[2], addr[3], 163 addr[4], addr[5]) ; 164 debug ("### Set environment from HW MAC addr = \"%s\"\n", ethaddr); 165 setenv ("ethaddr", ethaddr); 166 } 167 } 168 } 169 170 void eth_halt (void) 171 { 172 /* disable transmitter/receiver mode */ 173 put_reg (PP_LineCTL, 0); 174 175 /* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */ 176 get_reg_init_bus (PP_ChipID); 177 } 178 179 int eth_init (bd_t * bd) 180 { 181 /* verify chip id */ 182 if (get_reg_init_bus (PP_ChipID) != 0x630e) { 183 printf ("CS8900 Ethernet chip not found?!\n"); 184 return 0; 185 } 186 187 eth_reset (); 188 /* set the ethernet address */ 189 put_reg (PP_IA + 0, bd->bi_enetaddr[0] | (bd->bi_enetaddr[1] << 8)); 190 put_reg (PP_IA + 2, bd->bi_enetaddr[2] | (bd->bi_enetaddr[3] << 8)); 191 put_reg (PP_IA + 4, bd->bi_enetaddr[4] | (bd->bi_enetaddr[5] << 8)); 192 193 eth_reginit (); 194 return 0; 195 } 196 197 /* Get a data block via Ethernet */ 198 int eth_rx (void) 199 { 200 int i; 201 unsigned short rxlen; 202 unsigned short *addr; 203 unsigned short status; 204 205 status = get_reg (PP_RER); 206 207 if ((status & PP_RER_RxOK) == 0) 208 return 0; 209 210 status = CS8900_RTDATA; /* stat */ 211 rxlen = CS8900_RTDATA; /* len */ 212 213 #ifdef DEBUG 214 if (rxlen > PKTSIZE_ALIGN + PKTALIGN) 215 printf ("packet too big!\n"); 216 #endif 217 for (addr = (unsigned short *) NetRxPackets[0], i = rxlen >> 1; i > 0; 218 i--) 219 *addr++ = CS8900_RTDATA; 220 if (rxlen & 1) 221 *addr++ = CS8900_RTDATA; 222 223 /* Pass the packet up to the protocol layers. */ 224 NetReceive (NetRxPackets[0], rxlen); 225 226 return rxlen; 227 } 228 229 /* Send a data block via Ethernet. */ 230 int eth_send (volatile void *packet, int length) 231 { 232 volatile unsigned short *addr; 233 int tmo; 234 unsigned short s; 235 236 retry: 237 /* initiate a transmit sequence */ 238 CS8900_TxCMD = PP_TxCmd_TxStart_Full; 239 CS8900_TxLEN = length; 240 241 /* Test to see if the chip has allocated memory for the packet */ 242 if ((get_reg (PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) { 243 /* Oops... this should not happen! */ 244 #ifdef DEBUG 245 printf ("cs: unable to send packet; retrying...\n"); 246 #endif 247 for (tmo = get_timer (0) + 5 * CONFIG_SYS_HZ; get_timer (0) < tmo;) 248 /*NOP*/; 249 eth_reset (); 250 eth_reginit (); 251 goto retry; 252 } 253 254 /* Write the contents of the packet */ 255 /* assume even number of bytes */ 256 for (addr = packet; length > 0; length -= 2) 257 CS8900_RTDATA = *addr++; 258 259 /* wait for transfer to succeed */ 260 tmo = get_timer (0) + 5 * CONFIG_SYS_HZ; 261 while ((s = get_reg (PP_TER) & ~0x1F) == 0) { 262 if (get_timer (0) >= tmo) 263 break; 264 } 265 266 /* nothing */ ; 267 if ((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) { 268 #ifdef DEBUG 269 printf ("\ntransmission error %#x\n", s); 270 #endif 271 } 272 273 return 0; 274 } 275 276 static void cs8900_e2prom_ready(void) 277 { 278 while (get_reg(PP_SelfSTAT) & SI_BUSY) 279 ; 280 } 281 282 /***********************************************************/ 283 /* read a 16-bit word out of the EEPROM */ 284 /***********************************************************/ 285 286 int cs8900_e2prom_read(unsigned char addr, unsigned short *value) 287 { 288 cs8900_e2prom_ready(); 289 put_reg(PP_EECMD, EEPROM_READ_CMD | addr); 290 cs8900_e2prom_ready(); 291 *value = get_reg(PP_EEData); 292 293 return 0; 294 } 295 296 297 /***********************************************************/ 298 /* write a 16-bit word into the EEPROM */ 299 /***********************************************************/ 300 301 int cs8900_e2prom_write(unsigned char addr, unsigned short value) 302 { 303 cs8900_e2prom_ready(); 304 put_reg(PP_EECMD, EEPROM_WRITE_EN); 305 cs8900_e2prom_ready(); 306 put_reg(PP_EEData, value); 307 put_reg(PP_EECMD, EEPROM_WRITE_CMD | addr); 308 cs8900_e2prom_ready(); 309 put_reg(PP_EECMD, EEPROM_WRITE_DIS); 310 cs8900_e2prom_ready(); 311 312 return 0; 313 } 314