drivers/cs8900.c

   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 (CONFIG_COMMANDS & CFG_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 (unsigned short) CS8900_PDATA;
  69 }
  70 #endif
  71
  72 static unsigned short get_reg (int regno)
  73 {
  74         CS8900_PPTR = regno;
  75         return (unsigned short) 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_SelfST) & (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
 175 void eth_halt (void)
 176 {
 177         /* disable transmitter/receiver mode */
 178         put_reg (PP_LineCTL, 0);
 179
 180         /* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */
 181         get_reg_init_bus (PP_ChipID);
 182 }
 183
 184 int eth_init (bd_t * bd)
 185 {
 186
 187         /* verify chip id */
 188         if (get_reg_init_bus (PP_ChipID) != 0x630e) {
 189                 printf ("CS8900 Ethernet chip not found?!\n");
 190                 return 0;
 191         }
 192
 193         eth_reset ();
 194         /* set the ethernet address */
 195         put_reg (PP_IA + 0, bd->bi_enetaddr[0] | (bd->bi_enetaddr[1] << 8));
 196         put_reg (PP_IA + 2, bd->bi_enetaddr[2] | (bd->bi_enetaddr[3] << 8));
 197         put_reg (PP_IA + 4, bd->bi_enetaddr[4] | (bd->bi_enetaddr[5] << 8));
 198
 199         eth_reginit ();
 200         return 0;
 201 }
 202
 203 /* Get a data block via Ethernet */
 204 extern int eth_rx (void)
 205 {
 206         int i;
 207         unsigned short rxlen;
 208         unsigned short *addr;
 209         unsigned short status;
 210
 211         status = get_reg (PP_RER);
 212
 213         if ((status & PP_RER_RxOK) == 0)
 214                 return 0;
 215
 216         status = CS8900_RTDATA;         /* stat */
 217         rxlen = CS8900_RTDATA;          /* len */
 218
 219 #ifdef DEBUG
 220         if (rxlen > PKTSIZE_ALIGN + PKTALIGN)
 221                 printf ("packet too big!\n");
 222 #endif
 223         for (addr = (unsigned short *) NetRxPackets[0], i = rxlen >> 1; i > 0;
 224                  i--)
 225                 *addr++ = CS8900_RTDATA;
 226         if (rxlen & 1)
 227                 *addr++ = CS8900_RTDATA;
 228
 229         /* Pass the packet up to the protocol layers. */
 230         NetReceive (NetRxPackets[0], rxlen);
 231
 232         return rxlen;
 233 }
 234
 235 /* Send a data block via Ethernet. */
 236 extern int eth_send (volatile void *packet, int length)
 237 {
 238         volatile unsigned short *addr;
 239         int tmo;
 240         unsigned short s;
 241
 242 retry:
 243         /* initiate a transmit sequence */
 244         CS8900_TxCMD = PP_TxCmd_TxStart_Full;
 245         CS8900_TxLEN = length;
 246
 247         /* Test to see if the chip has allocated memory for the packet */
 248         if ((get_reg (PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) {
 249                 /* Oops... this should not happen! */
 250 #ifdef DEBUG
 251                 printf ("cs: unable to send packet; retrying...\n");
 252 #endif
 253                 for (tmo = get_timer (0) + 5 * CFG_HZ; get_timer (0) < tmo;)
 254                         /*NOP*/;
 255                 eth_reset ();
 256                 eth_reginit ();
 257                 goto retry;
 258         }
 259
 260         /* Write the contents of the packet */
 261         /* assume even number of bytes */
 262         for (addr = packet; length > 0; length -= 2)
 263                 CS8900_RTDATA = *addr++;
 264
 265         /* wait for transfer to succeed */
 266         tmo = get_timer (0) + 5 * CFG_HZ;
 267         while ((s = get_reg (PP_TER) & ~0x1F) == 0) {
 268                 if (get_timer (0) >= tmo)
 269                         break;
 270         }
 271
 272         /* nothing */ ;
 273         if ((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) {
 274 #ifdef DEBUG
 275                 printf ("\ntransmission error %#x\n", s);
 276 #endif
 277         }
 278
 279         return 0;
 280 }
 281
 282 static void cs8900_e2prom_ready(void)
 283 {
 284         while(get_reg(PP_SelfST) & SI_BUSY);
 285 }
 286
 287 /***********************************************************/
 288 /* read a 16-bit word out of the EEPROM                    */
 289 /***********************************************************/
 290
 291 int cs8900_e2prom_read(unsigned char addr, unsigned short *value)
 292 {
 293         cs8900_e2prom_ready();
 294         put_reg(PP_EECMD, EEPROM_READ_CMD | addr);
 295         cs8900_e2prom_ready();
 296         *value = get_reg(PP_EEData);
 297
 298         return 0;
 299 }
 300
 301
 302 /***********************************************************/
 303 /* write a 16-bit word into the EEPROM                     */
 304 /***********************************************************/
 305
 306 int cs8900_e2prom_write(unsigned char addr, unsigned short value)
 307 {
 308         cs8900_e2prom_ready();
 309         put_reg(PP_EECMD, EEPROM_WRITE_EN);
 310         cs8900_e2prom_ready();
 311         put_reg(PP_EEData, value);
 312         put_reg(PP_EECMD, EEPROM_WRITE_CMD | addr);
 313         cs8900_e2prom_ready();
 314         put_reg(PP_EECMD, EEPROM_WRITE_DIS);
 315         cs8900_e2prom_ready();
 316
 317         return 0;
 318 }
 319
 320 #endif  /* COMMANDS & CFG_NET */
 321
 322 #endif  /* CONFIG_DRIVER_CS8900 */