drivers/net/smc911x.c

   1 /*
   2  * SMSC LAN9[12]1[567] Network driver
   3  *
   4  * (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
   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
  25 #include <common.h>
  26 #include <command.h>
  27 #include <net.h>
  28 #include <miiphy.h>
  29
  30 #include "smc911x.h"
  31
  32 u32 pkt_data_pull(u32 addr) \
  33         __attribute__ ((weak, alias ("smc911x_reg_read")));
  34 void pkt_data_push(u32 addr, u32 val) \
  35         __attribute__ ((weak, alias ("smc911x_reg_write")));
  36
  37 #define mdelay(n)       udelay((n)*1000)
  38
  39 static int smx911x_handle_mac_address(bd_t *bd)
  40 {
  41         unsigned long addrh, addrl;
  42         uchar m[6];
  43
  44         if (eth_getenv_enetaddr("ethaddr", m)) {
  45                 /* if the environment has a valid mac address then use it */
  46                 addrl = m[0] | (m[1] << 8) | (m[2] << 16) | (m[3] << 24);
  47                 addrh = m[4] | (m[5] << 8);
  48                 smc911x_set_mac_csr(ADDRL, addrl);
  49                 smc911x_set_mac_csr(ADDRH, addrh);
  50         } else {
  51                 /* if not, try to get one from the eeprom */
  52                 addrh = smc911x_get_mac_csr(ADDRH);
  53                 addrl = smc911x_get_mac_csr(ADDRL);
  54
  55                 m[0] = (addrl       ) & 0xff;
  56                 m[1] = (addrl >>  8 ) & 0xff;
  57                 m[2] = (addrl >> 16 ) & 0xff;
  58                 m[3] = (addrl >> 24 ) & 0xff;
  59                 m[4] = (addrh       ) & 0xff;
  60                 m[5] = (addrh >>  8 ) & 0xff;
  61
  62                 /* we get 0xff when there is no eeprom connected */
  63                 if ((m[0] & m[1] & m[2] & m[3] & m[4] & m[5]) == 0xff) {
  64                         printf(DRIVERNAME ": no valid mac address in environment "
  65                                 "and no eeprom found\n");
  66                         return -1;
  67                 }
  68
  69                 eth_setenv_enetaddr("ethaddr", m);
  70         }
  71
  72         printf(DRIVERNAME ": MAC %pM\n", m);
  73
  74         return 0;
  75 }
  76
  77 static int smc911x_miiphy_read(u8 phy, u8 reg, u16 *val)
  78 {
  79         while (smc911x_get_mac_csr(MII_ACC) & MII_ACC_MII_BUSY)
  80                 ;
  81
  82         smc911x_set_mac_csr(MII_ACC, phy << 11 | reg << 6 | MII_ACC_MII_BUSY);
  83
  84         while (smc911x_get_mac_csr(MII_ACC) & MII_ACC_MII_BUSY)
  85                 ;
  86
  87         *val = smc911x_get_mac_csr(MII_DATA);
  88
  89         return 0;
  90 }
  91
  92 static int smc911x_miiphy_write(u8 phy, u8 reg, u16  val)
  93 {
  94         while (smc911x_get_mac_csr(MII_ACC) & MII_ACC_MII_BUSY)
  95                 ;
  96
  97         smc911x_set_mac_csr(MII_DATA, val);
  98         smc911x_set_mac_csr(MII_ACC,
  99                 phy << 11 | reg << 6 | MII_ACC_MII_BUSY | MII_ACC_MII_WRITE);
 100
 101         while (smc911x_get_mac_csr(MII_ACC) & MII_ACC_MII_BUSY)
 102                 ;
 103         return 0;
 104 }
 105
 106 static int smc911x_phy_reset(void)
 107 {
 108         u32 reg;
 109
 110         reg = smc911x_reg_read(PMT_CTRL);
 111         reg &= ~0xfffff030;
 112         reg |= PMT_CTRL_PHY_RST;
 113         smc911x_reg_write(PMT_CTRL, reg);
 114
 115         mdelay(100);
 116
 117         return 0;
 118 }
 119
 120 static void smc911x_shutdown(void)
 121 {
 122         unsigned int cr;
 123
 124         /* Turn of Rx and TX */
 125         cr = smc911x_get_mac_csr(MAC_CR);
 126         cr &= ~(MAC_CR_TXEN | MAC_CR_RXEN | MAC_CR_HBDIS);
 127         smc911x_set_mac_csr(MAC_CR, cr);
 128
 129         /* Stop Transmission */
 130         cr = smc911x_get_mac_csr(TX_CFG);
 131         cr &= ~(TX_CFG_STOP_TX);
 132         smc911x_set_mac_csr(TX_CFG, cr);
 133         /* Stop receiving packets */
 134         cr = smc911x_get_mac_csr(RX_CFG);
 135         cr &= ~(RX_CFG_RXDOFF);
 136         smc911x_set_mac_csr(RX_CFG, cr);
 137
 138 }
 139
 140
 141 static void smc911x_phy_configure(void)
 142 {
 143         int timeout;
 144         u16 status;
 145
 146         smc911x_phy_reset();
 147
 148         smc911x_miiphy_write(1, PHY_BMCR, PHY_BMCR_RESET);
 149         mdelay(1);
 150         smc911x_miiphy_write(1, PHY_ANAR, 0x01e1);
 151         smc911x_miiphy_write(1, PHY_BMCR, PHY_BMCR_AUTON | PHY_BMCR_RST_NEG);
 152
 153         timeout = 5000;
 154         do {
 155                 mdelay(1);
 156                 if ((timeout--) == 0)
 157                         goto err_out;
 158
 159                 if (smc911x_miiphy_read(1, PHY_BMSR, &status) != 0)
 160                         goto err_out;
 161         } while (!(status & PHY_BMSR_LS));
 162
 163         printf(DRIVERNAME ": phy initialized\n");
 164
 165         return;
 166
 167 err_out:
 168         printf(DRIVERNAME ": autonegotiation timed out\n");
 169 }
 170
 171 static void smc911x_enable(void)
 172 {
 173         /* Enable TX */
 174         smc911x_reg_write(HW_CFG, 8 << 16 | HW_CFG_SF);
 175
 176         smc911x_reg_write(GPT_CFG, GPT_CFG_TIMER_EN | 10000);
 177
 178         smc911x_reg_write(TX_CFG, TX_CFG_TX_ON);
 179
 180         /* no padding to start of packets */
 181         smc911x_reg_write(RX_CFG, 0);
 182
 183         smc911x_set_mac_csr(MAC_CR, MAC_CR_TXEN | MAC_CR_RXEN | MAC_CR_HBDIS);
 184
 185 }
 186
 187 int eth_init(bd_t *bd)
 188 {
 189         printf(DRIVERNAME ": initializing\n");
 190
 191         if (smc911x_detect_chip())
 192                 goto err_out;
 193
 194         smc911x_reset();
 195
 196         /* Configure the PHY, initialize the link state */
 197         smc911x_phy_configure();
 198
 199         if (smx911x_handle_mac_address(bd))
 200                 goto err_out;
 201
 202         /* Turn on Tx + Rx */
 203         smc911x_enable();
 204
 205         return 0;
 206
 207 err_out:
 208         return -1;
 209 }
 210
 211 int eth_send(volatile void *packet, int length)
 212 {
 213         u32 *data = (u32*)packet;
 214         u32 tmplen;
 215         u32 status;
 216
 217         smc911x_reg_write(TX_DATA_FIFO, TX_CMD_A_INT_FIRST_SEG | TX_CMD_A_INT_LAST_SEG | length);
 218         smc911x_reg_write(TX_DATA_FIFO, length);
 219
 220         tmplen = (length + 3) / 4;
 221
 222         while (tmplen--)
 223                 pkt_data_push(TX_DATA_FIFO, *data++);
 224
 225         /* wait for transmission */
 226         while (!((smc911x_reg_read(TX_FIFO_INF) & TX_FIFO_INF_TSUSED) >> 16));
 227
 228         /* get status. Ignore 'no carrier' error, it has no meaning for
 229          * full duplex operation
 230          */
 231         status = smc911x_reg_read(TX_STATUS_FIFO) & (TX_STS_LOC | TX_STS_LATE_COLL |
 232                 TX_STS_MANY_COLL | TX_STS_MANY_DEFER | TX_STS_UNDERRUN);
 233
 234         if (!status)
 235                 return 0;
 236
 237         printf(DRIVERNAME ": failed to send packet: %s%s%s%s%s\n",
 238                 status & TX_STS_LOC ? "TX_STS_LOC " : "",
 239                 status & TX_STS_LATE_COLL ? "TX_STS_LATE_COLL " : "",
 240                 status & TX_STS_MANY_COLL ? "TX_STS_MANY_COLL " : "",
 241                 status & TX_STS_MANY_DEFER ? "TX_STS_MANY_DEFER " : "",
 242                 status & TX_STS_UNDERRUN ? "TX_STS_UNDERRUN" : "");
 243
 244         return -1;
 245 }
 246
 247 void eth_halt(void)
 248 {
 249         smc911x_shutdown();
 250 }
 251
 252 int eth_rx(void)
 253 {
 254         u32 *data = (u32 *)NetRxPackets[0];
 255         u32 pktlen, tmplen;
 256         u32 status;
 257
 258         if ((smc911x_reg_read(RX_FIFO_INF) & RX_FIFO_INF_RXSUSED) >> 16) {
 259                 status = smc911x_reg_read(RX_STATUS_FIFO);
 260                 pktlen = (status & RX_STS_PKT_LEN) >> 16;
 261
 262                 smc911x_reg_write(RX_CFG, 0);
 263
 264                 tmplen = (pktlen + 2+ 3) / 4;
 265                 while (tmplen--)
 266                         *data++ = pkt_data_pull(RX_DATA_FIFO);
 267
 268                 if (status & RX_STS_ES)
 269                         printf(DRIVERNAME
 270                                 ": dropped bad packet. Status: 0x%08x\n",
 271                                 status);
 272                 else
 273                         NetReceive(NetRxPackets[0], pktlen);
 274         }
 275
 276         return 0;
 277 }