drivers/net/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 #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 }