arch/mips/cpu/au1x00_eth.c

   1 /* Only eth0 supported for now
   2  *
   3  * (C) Copyright 2003
   4  * Thomas.Lange@corelatus.se
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24 #include <config.h>
  25
  26 #if defined(CONFIG_SYS_DISCOVER_PHY)
  27 #error "PHY not supported yet"
  28 /* We just assume that we are running 100FD for now */
  29 /* We all use switches, right? ;-) */
  30 #endif
  31
  32 /* I assume ethernet behaves like au1000 */
  33
  34 #ifdef CONFIG_SOC_AU1000
  35 /* Base address differ between cpu:s */
  36 #define ETH0_BASE AU1000_ETH0_BASE
  37 #define MAC0_ENABLE AU1000_MAC0_ENABLE
  38 #else
  39 #ifdef CONFIG_SOC_AU1100
  40 #define ETH0_BASE AU1100_ETH0_BASE
  41 #define MAC0_ENABLE AU1100_MAC0_ENABLE
  42 #else
  43 #ifdef CONFIG_SOC_AU1500
  44 #define ETH0_BASE AU1500_ETH0_BASE
  45 #define MAC0_ENABLE AU1500_MAC0_ENABLE
  46 #else
  47 #ifdef CONFIG_SOC_AU1550
  48 #define ETH0_BASE AU1550_ETH0_BASE
  49 #define MAC0_ENABLE AU1550_MAC0_ENABLE
  50 #else
  51 #error "No valid cpu set"
  52 #endif
  53 #endif
  54 #endif
  55 #endif
  56
  57 #include <common.h>
  58 #include <malloc.h>
  59 #include <net.h>
  60 #include <command.h>
  61 #include <asm/io.h>
  62 #include <asm/au1x00.h>
  63
  64 #if defined(CONFIG_CMD_MII)
  65 #include <miiphy.h>
  66 #endif
  67
  68 /* Ethernet Transmit and Receive Buffers */
  69 #define DBUF_LENGTH  1520
  70 #define PKT_MAXBUF_SIZE         1518
  71
  72 static char txbuf[DBUF_LENGTH];
  73
  74 static int next_tx;
  75 static int next_rx;
  76
  77 /* 4 rx and 4 tx fifos */
  78 #define NO_OF_FIFOS 4
  79
  80 typedef struct{
  81         u32 status;
  82         u32 addr;
  83         u32 len; /* Only used for tx */
  84         u32 not_used;
  85 } mac_fifo_t;
  86
  87 mac_fifo_t mac_fifo[NO_OF_FIFOS];
  88
  89 #define MAX_WAIT 1000
  90
  91 #if defined(CONFIG_CMD_MII)
  92 int  au1x00_miiphy_read(char *devname, unsigned char addr,
  93                 unsigned char reg, unsigned short * value)
  94 {
  95         volatile u32 *mii_control_reg = (volatile u32*)(ETH0_BASE+MAC_MII_CNTRL);
  96         volatile u32 *mii_data_reg = (volatile u32*)(ETH0_BASE+MAC_MII_DATA);
  97         u32 mii_control;
  98         unsigned int timedout = 20;
  99
 100         while (*mii_control_reg & MAC_MII_BUSY) {
 101                 udelay(1000);
 102                 if (--timedout == 0) {
 103                         printf("au1x00_eth: miiphy_read busy timeout!!\n");
 104                         return -1;
 105                 }
 106         }
 107
 108         mii_control = MAC_SET_MII_SELECT_REG(reg) |
 109                 MAC_SET_MII_SELECT_PHY(addr) | MAC_MII_READ;
 110
 111         *mii_control_reg = mii_control;
 112
 113         timedout = 20;
 114         while (*mii_control_reg & MAC_MII_BUSY) {
 115                 udelay(1000);
 116                 if (--timedout == 0) {
 117                         printf("au1x00_eth: miiphy_read busy timeout!!\n");
 118                         return -1;
 119                 }
 120         }
 121         *value = *mii_data_reg;
 122         return 0;
 123 }
 124
 125 int  au1x00_miiphy_write(char *devname, unsigned char addr,
 126                 unsigned char reg, unsigned short value)
 127 {
 128         volatile u32 *mii_control_reg = (volatile u32*)(ETH0_BASE+MAC_MII_CNTRL);
 129         volatile u32 *mii_data_reg = (volatile u32*)(ETH0_BASE+MAC_MII_DATA);
 130         u32 mii_control;
 131         unsigned int timedout = 20;
 132
 133         while (*mii_control_reg & MAC_MII_BUSY) {
 134                 udelay(1000);
 135                 if (--timedout == 0) {
 136                         printf("au1x00_eth: miiphy_write busy timeout!!\n");
 137                         return -1;
 138                 }
 139         }
 140
 141         mii_control = MAC_SET_MII_SELECT_REG(reg) |
 142                 MAC_SET_MII_SELECT_PHY(addr) | MAC_MII_WRITE;
 143
 144         *mii_data_reg = value;
 145         *mii_control_reg = mii_control;
 146         return 0;
 147 }
 148 #endif
 149
 150 static int au1x00_send(struct eth_device* dev, volatile void *packet, int length){
 151         volatile mac_fifo_t *fifo_tx =
 152                 (volatile mac_fifo_t*)(MAC0_TX_DMA_ADDR+MAC_TX_BUFF0_STATUS);
 153         int i;
 154         int res;
 155
 156         /* tx fifo should always be idle */
 157         fifo_tx[next_tx].len = length;
 158         fifo_tx[next_tx].addr = (virt_to_phys(packet))|TX_DMA_ENABLE;
 159         au_sync();
 160
 161         udelay(1);
 162         i=0;
 163         while(!(fifo_tx[next_tx].addr&TX_T_DONE)){
 164                 if(i>MAX_WAIT){
 165                         printf("TX timeout\n");
 166                         break;
 167                 }
 168                 udelay(1);
 169                 i++;
 170         }
 171
 172         /* Clear done bit */
 173         fifo_tx[next_tx].addr = 0;
 174         fifo_tx[next_tx].len = 0;
 175         au_sync();
 176
 177         res = fifo_tx[next_tx].status;
 178
 179         next_tx++;
 180         if(next_tx>=NO_OF_FIFOS){
 181                 next_tx=0;
 182         }
 183         return(res);
 184 }
 185
 186 static int au1x00_recv(struct eth_device* dev){
 187         volatile mac_fifo_t *fifo_rx =
 188                 (volatile mac_fifo_t*)(MAC0_RX_DMA_ADDR+MAC_RX_BUFF0_STATUS);
 189
 190         int length;
 191         u32 status;
 192
 193         for(;;){
 194                 if(!(fifo_rx[next_rx].addr&RX_T_DONE)){
 195                         /* Nothing has been received */
 196                         return(-1);
 197                 }
 198
 199                 status = fifo_rx[next_rx].status;
 200
 201                 length = status&0x3FFF;
 202
 203                 if(status&RX_ERROR){
 204                         printf("Rx error 0x%x\n", status);
 205                 }
 206                 else{
 207                         /* Pass the packet up to the protocol layers. */
 208                         NetReceive(NetRxPackets[next_rx], length - 4);
 209                 }
 210
 211                 fifo_rx[next_rx].addr = (virt_to_phys(NetRxPackets[next_rx]))|RX_DMA_ENABLE;
 212
 213                 next_rx++;
 214                 if(next_rx>=NO_OF_FIFOS){
 215                         next_rx=0;
 216                 }
 217         } /* for */
 218
 219         return(0); /* Does anyone use this? */
 220 }
 221
 222 static int au1x00_init(struct eth_device* dev, bd_t * bd){
 223
 224         volatile u32 *macen = (volatile u32*)MAC0_ENABLE;
 225         volatile u32 *mac_ctrl = (volatile u32*)(ETH0_BASE+MAC_CONTROL);
 226         volatile u32 *mac_addr_high = (volatile u32*)(ETH0_BASE+MAC_ADDRESS_HIGH);
 227         volatile u32 *mac_addr_low = (volatile u32*)(ETH0_BASE+MAC_ADDRESS_LOW);
 228         volatile u32 *mac_mcast_high = (volatile u32*)(ETH0_BASE+MAC_MCAST_HIGH);
 229         volatile u32 *mac_mcast_low = (volatile u32*)(ETH0_BASE+MAC_MCAST_LOW);
 230         volatile mac_fifo_t *fifo_tx =
 231                 (volatile mac_fifo_t*)(MAC0_TX_DMA_ADDR+MAC_TX_BUFF0_STATUS);
 232         volatile mac_fifo_t *fifo_rx =
 233                 (volatile mac_fifo_t*)(MAC0_RX_DMA_ADDR+MAC_RX_BUFF0_STATUS);
 234         int i;
 235
 236         next_tx = TX_GET_DMA_BUFFER(fifo_tx[0].addr);
 237         next_rx = RX_GET_DMA_BUFFER(fifo_rx[0].addr);
 238
 239         /* We have to enable clocks before releasing reset */
 240         *macen = MAC_EN_CLOCK_ENABLE;
 241         udelay(10);
 242
 243         /* Enable MAC0 */
 244         /* We have to release reset before accessing registers */
 245         *macen = MAC_EN_CLOCK_ENABLE|MAC_EN_RESET0|
 246                 MAC_EN_RESET1|MAC_EN_RESET2;
 247         udelay(10);
 248
 249         for(i=0;i<NO_OF_FIFOS;i++){
 250                 fifo_tx[i].len = 0;
 251                 fifo_tx[i].addr = virt_to_phys(&txbuf[0]);
 252                 fifo_rx[i].addr = (virt_to_phys(NetRxPackets[i]))|RX_DMA_ENABLE;
 253         }
 254
 255         /* Put mac addr in little endian */
 256 #define ea eth_get_dev()->enetaddr
 257         *mac_addr_high  =       (ea[5] <<  8) | (ea[4]      ) ;
 258         *mac_addr_low   =       (ea[3] << 24) | (ea[2] << 16) |
 259                 (ea[1] <<  8) | (ea[0]      ) ;
 260 #undef ea
 261         *mac_mcast_low = 0;
 262         *mac_mcast_high = 0;
 263
 264         /* Make sure the MAC buffer is in the correct endian mode */
 265 #ifdef __LITTLE_ENDIAN
 266         *mac_ctrl = MAC_FULL_DUPLEX;
 267         udelay(1);
 268         *mac_ctrl = MAC_FULL_DUPLEX|MAC_RX_ENABLE|MAC_TX_ENABLE;
 269 #else
 270         *mac_ctrl = MAC_BIG_ENDIAN|MAC_FULL_DUPLEX;
 271         udelay(1);
 272         *mac_ctrl = MAC_BIG_ENDIAN|MAC_FULL_DUPLEX|MAC_RX_ENABLE|MAC_TX_ENABLE;
 273 #endif
 274
 275         return(1);
 276 }
 277
 278 static void au1x00_halt(struct eth_device* dev){
 279         volatile u32 *macen = (volatile u32*)MAC0_ENABLE;
 280
 281         /* Put MAC0 in reset */
 282         *macen = 0;
 283 }
 284
 285 int au1x00_enet_initialize(bd_t *bis){
 286         struct eth_device* dev;
 287
 288         if ((dev = (struct eth_device*)malloc(sizeof *dev)) == NULL) {
 289                 puts ("malloc failed\n");
 290                 return -1;
 291         }
 292
 293         memset(dev, 0, sizeof *dev);
 294
 295         sprintf(dev->name, "Au1X00 ethernet");
 296         dev->iobase = 0;
 297         dev->priv   = 0;
 298         dev->init   = au1x00_init;
 299         dev->halt   = au1x00_halt;
 300         dev->send   = au1x00_send;
 301         dev->recv   = au1x00_recv;
 302
 303         eth_register(dev);
 304
 305 #if defined(CONFIG_CMD_MII)
 306         miiphy_register(dev->name,
 307                 au1x00_miiphy_read, au1x00_miiphy_write);
 308 #endif
 309
 310         return 1;
 311 }