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 #ifdef CONFIG_DRIVER_CS8900 45 46 #if defined(CONFIG_CMD_NET) 47 48 #undef DEBUG 49 50 /* packet page register access functions */ 51 52 #ifdef CS8900_BUS32 53 /* we don't need 16 bit initialisation on 32 bit bus */ 54 #define get_reg_init_bus(x) get_reg((x)) 55 #else 56 static unsigned short get_reg_init_bus (int regno) 57 { 58 /* force 16 bit busmode */ 59 volatile unsigned char c; 60 61 c = CS8900_BUS16_0; 62 c = CS8900_BUS16_1; 63 c = CS8900_BUS16_0; 64 c = CS8900_BUS16_1; 65 c = CS8900_BUS16_0; 66 67 CS8900_PPTR = regno; 68 return CS8900_PDATA; 69 } 70 #endif 71 72 static unsigned short get_reg (int regno) 73 { 74 CS8900_PPTR = regno; 75 return CS8900_PDATA; 76 } 77 78 79 static void put_reg (int regno, unsigned short val) 80 { 81 CS8900_PPTR = regno; 82 CS8900_PDATA = val; 83 } 84 85 static void eth_reset (void) 86 { 87 int tmo; 88 unsigned short us; 89 90 /* reset NIC */ 91 put_reg (PP_SelfCTL, get_reg (PP_SelfCTL) | PP_SelfCTL_Reset); 92 93 /* wait for 200ms */ 94 udelay (200000); 95 /* Wait until the chip is reset */ 96 97 tmo = get_timer (0) + 1 * CFG_HZ; 98 while ((((us = get_reg_init_bus (PP_SelfSTAT)) & PP_SelfSTAT_InitD) == 0) 99 && tmo < get_timer (0)) 100 /*NOP*/; 101 } 102 103 static void eth_reginit (void) 104 { 105 /* receive only error free packets addressed to this card */ 106 put_reg (PP_RxCTL, PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK); 107 /* do not generate any interrupts on receive operations */ 108 put_reg (PP_RxCFG, 0); 109 /* do not generate any interrupts on transmit operations */ 110 put_reg (PP_TxCFG, 0); 111 /* do not generate any interrupts on buffer operations */ 112 put_reg (PP_BufCFG, 0); 113 /* enable transmitter/receiver mode */ 114 put_reg (PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx); 115 } 116 117 void cs8900_get_enetaddr (uchar * addr) 118 { 119 int i; 120 unsigned char env_enetaddr[6]; 121 char *tmp = getenv ("ethaddr"); 122 char *end; 123 124 for (i=0; i<6; i++) { 125 env_enetaddr[i] = tmp ? simple_strtoul(tmp, &end, 16) : 0; 126 if (tmp) 127 tmp = (*end) ? end+1 : end; 128 } 129 130 /* verify chip id */ 131 if (get_reg_init_bus (PP_ChipID) != 0x630e) 132 return; 133 eth_reset (); 134 if ((get_reg (PP_SelfSTAT) & (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) == 135 (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) { 136 137 /* Load the MAC from EEPROM */ 138 for (i = 0; i < 6 / 2; i++) { 139 unsigned int Addr; 140 141 Addr = get_reg (PP_IA + i * 2); 142 addr[i * 2] = Addr & 0xFF; 143 addr[i * 2 + 1] = Addr >> 8; 144 } 145 146 if (memcmp(env_enetaddr, "\0\0\0\0\0\0", 6) != 0 && 147 memcmp(env_enetaddr, addr, 6) != 0) { 148 printf ("\nWarning: MAC addresses don't match:\n"); 149 printf ("\tHW MAC address: " 150 "%02X:%02X:%02X:%02X:%02X:%02X\n", 151 addr[0], addr[1], 152 addr[2], addr[3], 153 addr[4], addr[5] ); 154 printf ("\t\"ethaddr\" value: " 155 "%02X:%02X:%02X:%02X:%02X:%02X\n", 156 env_enetaddr[0], env_enetaddr[1], 157 env_enetaddr[2], env_enetaddr[3], 158 env_enetaddr[4], env_enetaddr[5]) ; 159 debug ("### Set MAC addr from environment\n"); 160 memcpy (addr, env_enetaddr, 6); 161 } 162 if (!tmp) { 163 char ethaddr[20]; 164 sprintf (ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X", 165 addr[0], addr[1], 166 addr[2], addr[3], 167 addr[4], addr[5]) ; 168 debug ("### Set environment from HW MAC addr = \"%s\"\n", ethaddr); 169 setenv ("ethaddr", ethaddr); 170 } 171 } 172 } 173 174 void eth_halt (void) 175 { 176 /* disable transmitter/receiver mode */ 177 put_reg (PP_LineCTL, 0); 178 179 /* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */ 180 get_reg_init_bus (PP_ChipID); 181 } 182 183 int eth_init (bd_t * bd) 184 { 185 /* verify chip id */ 186 if (get_reg_init_bus (PP_ChipID) != 0x630e) { 187 printf ("CS8900 Ethernet chip not found?!\n"); 188 return 0; 189 } 190 191 eth_reset (); 192 /* set the ethernet address */ 193 put_reg (PP_IA + 0, bd->bi_enetaddr[0] | (bd->bi_enetaddr[1] << 8)); 194 put_reg (PP_IA + 2, bd->bi_enetaddr[2] | (bd->bi_enetaddr[3] << 8)); 195 put_reg (PP_IA + 4, bd->bi_enetaddr[4] | (bd->bi_enetaddr[5] << 8)); 196 197 eth_reginit (); 198 return 0; 199 } 200 201 /* Get a data block via Ethernet */ 202 int eth_rx (void) 203 { 204 int i; 205 unsigned short rxlen; 206 unsigned short *addr; 207 unsigned short status; 208 209 status = get_reg (PP_RER); 210 211 if ((status & PP_RER_RxOK) == 0) 212 return 0; 213 214 status = CS8900_RTDATA; /* stat */ 215 rxlen = CS8900_RTDATA; /* len */ 216 217 #ifdef DEBUG 218 if (rxlen > PKTSIZE_ALIGN + PKTALIGN) 219 printf ("packet too big!\n"); 220 #endif 221 for (addr = (unsigned short *) NetRxPackets[0], i = rxlen >> 1; i > 0; 222 i--) 223 *addr++ = CS8900_RTDATA; 224 if (rxlen & 1) 225 *addr++ = CS8900_RTDATA; 226 227 /* Pass the packet up to the protocol layers. */ 228 NetReceive (NetRxPackets[0], rxlen); 229 230 return rxlen; 231 } 232 233 /* Send a data block via Ethernet. */ 234 int eth_send (volatile void *packet, int length) 235 { 236 volatile unsigned short *addr; 237 int tmo; 238 unsigned short s; 239 240 retry: 241 /* initiate a transmit sequence */ 242 CS8900_TxCMD = PP_TxCmd_TxStart_Full; 243 CS8900_TxLEN = length; 244 245 /* Test to see if the chip has allocated memory for the packet */ 246 if ((get_reg (PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) { 247 /* Oops... this should not happen! */ 248 #ifdef DEBUG 249 printf ("cs: unable to send packet; retrying...\n"); 250 #endif 251 for (tmo = get_timer (0) + 5 * CFG_HZ; get_timer (0) < tmo;) 252 /*NOP*/; 253 eth_reset (); 254 eth_reginit (); 255 goto retry; 256 } 257 258 /* Write the contents of the packet */ 259 /* assume even number of bytes */ 260 for (addr = packet; length > 0; length -= 2) 261 CS8900_RTDATA = *addr++; 262 263 /* wait for transfer to succeed */ 264 tmo = get_timer (0) + 5 * CFG_HZ; 265 while ((s = get_reg (PP_TER) & ~0x1F) == 0) { 266 if (get_timer (0) >= tmo) 267 break; 268 } 269 270 /* nothing */ ; 271 if ((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) { 272 #ifdef DEBUG 273 printf ("\ntransmission error %#x\n", s); 274 #endif 275 } 276 277 return 0; 278 } 279 280 static void cs8900_e2prom_ready(void) 281 { 282 while (get_reg(PP_SelfSTAT) & SI_BUSY) 283 ; 284 } 285 286 /***********************************************************/ 287 /* read a 16-bit word out of the EEPROM */ 288 /***********************************************************/ 289 290 int cs8900_e2prom_read(unsigned char addr, unsigned short *value) 291 { 292 cs8900_e2prom_ready(); 293 put_reg(PP_EECMD, EEPROM_READ_CMD | addr); 294 cs8900_e2prom_ready(); 295 *value = get_reg(PP_EEData); 296 297 return 0; 298 } 299 300 301 /***********************************************************/ 302 /* write a 16-bit word into the EEPROM */ 303 /***********************************************************/ 304 305 int cs8900_e2prom_write(unsigned char addr, unsigned short value) 306 { 307 cs8900_e2prom_ready(); 308 put_reg(PP_EECMD, EEPROM_WRITE_EN); 309 cs8900_e2prom_ready(); 310 put_reg(PP_EEData, value); 311 put_reg(PP_EECMD, EEPROM_WRITE_CMD | addr); 312 cs8900_e2prom_ready(); 313 put_reg(PP_EECMD, EEPROM_WRITE_DIS); 314 cs8900_e2prom_ready(); 315 316 return 0; 317 } 318 319 #endif /* CONFIG_CMD_NET */ 320 321 #endif /* CONFIG_DRIVER_CS8900 */ 322