target/linux/ifxmips/files/drivers/net/ifxmips_mii0.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  *   Copyright (C) 2005 Wu Qi Ming <Qi-Ming.Wu@infineon.com>
  17  *   Copyright (C) 2008 John Crispin <blogic@openwrt.org>
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/slab.h>
  22 #include <linux/errno.h>
  23 #include <linux/types.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/in.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/ip.h>
  30 #include <linux/tcp.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/mm.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/init.h>
  36 #include <linux/delay.h>
  37 #include <asm/checksum.h>
  38 #include <asm/ifxmips/ifxmips.h>
  39 #include <asm/ifxmips/ifxmips_dma.h>
  40 #include <asm/ifxmips/ifxmips_pmu.h>
  41
  42 struct ifxmips_mii_priv {
  43         struct net_device_stats stats;
  44         struct dma_device_info *dma_device;
  45         struct sk_buff *skb;
  46 };
  47
  48 static struct net_device *ifxmips_mii0_dev;
  49 static unsigned char mac_addr[MAX_ADDR_LEN];
  50
  51 void ifxmips_write_mdio(u32 phy_addr, u32 phy_reg, u16 phy_data)
  52 {
  53         u32 val = MDIO_ACC_REQUEST |
  54                 ((phy_addr & MDIO_ACC_ADDR_MASK) << MDIO_ACC_ADDR_OFFSET) |
  55                 ((phy_reg & MDIO_ACC_REG_MASK) << MDIO_ACC_REG_OFFSET) |
  56                 phy_data;
  57
  58         while (ifxmips_r32(IFXMIPS_PPE32_MDIO_ACC) & MDIO_ACC_REQUEST);
  59         ifxmips_w32(val, IFXMIPS_PPE32_MDIO_ACC);
  60 }
  61 EXPORT_SYMBOL(ifxmips_write_mdio);
  62
  63 unsigned short ifxmips_read_mdio(u32 phy_addr, u32 phy_reg)
  64 {
  65         u32 val = MDIO_ACC_REQUEST | MDIO_ACC_READ |
  66                 ((phy_addr & MDIO_ACC_ADDR_MASK) << MDIO_ACC_ADDR_OFFSET) |
  67                 ((phy_reg & MDIO_ACC_REG_MASK) << MDIO_ACC_REG_OFFSET);
  68
  69         while (ifxmips_r32(IFXMIPS_PPE32_MDIO_ACC) & MDIO_ACC_REQUEST) ;
  70         ifxmips_w32(val, IFXMIPS_PPE32_MDIO_ACC);
  71         while (ifxmips_r32(IFXMIPS_PPE32_MDIO_ACC) & MDIO_ACC_REQUEST) ;
  72         val = ifxmips_r32(IFXMIPS_PPE32_MDIO_ACC) & MDIO_ACC_VAL_MASK;
  73         return val;
  74 }
  75 EXPORT_SYMBOL(ifxmips_read_mdio);
  76
  77 int ifxmips_ifxmips_mii_open(struct net_device *dev)
  78 {
  79         struct ifxmips_mii_priv *priv = (struct ifxmips_mii_priv *)dev->priv;
  80         struct dma_device_info *dma_dev = priv->dma_device;
  81         int i;
  82
  83         for (i = 0; i < dma_dev->max_rx_chan_num; i++) {
  84                 if ((dma_dev->rx_chan[i])->control == IFXMIPS_DMA_CH_ON)
  85                         (dma_dev->rx_chan[i])->open(dma_dev->rx_chan[i]);
  86         }
  87         netif_start_queue(dev);
  88         return 0;
  89 }
  90
  91 int ifxmips_mii_release(struct net_device *dev)
  92 {
  93         struct ifxmips_mii_priv *priv = (struct ifxmips_mii_priv *)dev->priv;
  94         struct dma_device_info *dma_dev = priv->dma_device;
  95         int i;
  96
  97         for (i = 0; i < dma_dev->max_rx_chan_num; i++)
  98                 dma_dev->rx_chan[i]->close(dma_dev->rx_chan[i]);
  99         netif_stop_queue(dev);
 100         return 0;
 101 }
 102
 103 int ifxmips_mii_hw_receive(struct net_device *dev, struct dma_device_info *dma_dev)
 104 {
 105         struct ifxmips_mii_priv *priv = (struct ifxmips_mii_priv *)dev->priv;
 106         unsigned char *buf = NULL;
 107         struct sk_buff *skb = NULL;
 108         int len = 0;
 109
 110         len = dma_device_read(dma_dev, &buf, (void **)&skb);
 111
 112         if (len >= ETHERNET_PACKET_DMA_BUFFER_SIZE) {
 113                 printk(KERN_INFO "ifxmips_mii0: packet too large %d\n", len);
 114                 goto ifxmips_mii_hw_receive_err_exit;
 115         }
 116
 117         /* remove CRC */
 118         len -= 4;
 119         if (skb == NULL) {
 120                 printk(KERN_INFO "ifxmips_mii0: cannot restore pointer\n");
 121                 goto ifxmips_mii_hw_receive_err_exit;
 122         }
 123
 124         if (len > (skb->end - skb->tail)) {
 125                 printk(KERN_INFO "ifxmips_mii0: BUG, len:%d end:%p tail:%p\n",
 126                         (len+4), skb->end, skb->tail);
 127                 goto ifxmips_mii_hw_receive_err_exit;
 128         }
 129
 130         skb_put(skb, len);
 131         skb->dev = dev;
 132         skb->protocol = eth_type_trans(skb, dev);
 133         netif_rx(skb);
 134
 135         priv->stats.rx_packets++;
 136         priv->stats.rx_bytes += len;
 137         return 0;
 138
 139 ifxmips_mii_hw_receive_err_exit:
 140         if (len == 0) {
 141                 if (skb)
 142                         dev_kfree_skb_any(skb);
 143                 priv->stats.rx_errors++;
 144                 priv->stats.rx_dropped++;
 145                 return -EIO;
 146         } else {
 147                 return len;
 148         }
 149 }
 150
 151 int ifxmips_mii_hw_tx(char *buf, int len, struct net_device *dev)
 152 {
 153         int ret = 0;
 154         struct ifxmips_mii_priv *priv = dev->priv;
 155         struct dma_device_info *dma_dev = priv->dma_device;
 156         ret = dma_device_write(dma_dev, buf, len, priv->skb);
 157         return ret;
 158 }
 159
 160 int ifxmips_mii_tx(struct sk_buff *skb, struct net_device *dev)
 161 {
 162         int len;
 163         char *data;
 164         struct ifxmips_mii_priv *priv = dev->priv;
 165         struct dma_device_info *dma_dev = priv->dma_device;
 166
 167         len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
 168         data = skb->data;
 169         priv->skb = skb;
 170         dev->trans_start = jiffies;
 171         /* TODO: we got more than 1 dma channel,
 172            so we should do something intelligent here to select one */
 173         dma_dev->current_tx_chan = 0;
 174
 175         wmb();
 176
 177         if (ifxmips_mii_hw_tx(data, len, dev) != len) {
 178                 dev_kfree_skb_any(skb);
 179                 priv->stats.tx_errors++;
 180                 priv->stats.tx_dropped++;
 181         } else {
 182                 priv->stats.tx_packets++;
 183                 priv->stats.tx_bytes += len;
 184         }
 185
 186         return 0;
 187 }
 188
 189 void ifxmips_mii_tx_timeout(struct net_device *dev)
 190 {
 191         int i;
 192         struct ifxmips_mii_priv *priv = (struct ifxmips_mii_priv *)dev->priv;
 193
 194         priv->stats.tx_errors++;
 195         for (i = 0; i < priv->dma_device->max_tx_chan_num; i++)
 196                 priv->dma_device->tx_chan[i]->disable_irq(priv->dma_device->tx_chan[i]);
 197         netif_wake_queue(dev);
 198         return;
 199 }
 200
 201 int dma_intr_handler(struct dma_device_info *dma_dev, int status)
 202 {
 203         int i;
 204
 205         switch (status) {
 206         case RCV_INT:
 207                 ifxmips_mii_hw_receive(ifxmips_mii0_dev, dma_dev);
 208                 break;
 209
 210         case TX_BUF_FULL_INT:
 211                 printk(KERN_INFO "ifxmips_mii0: tx buffer full\n");
 212                 netif_stop_queue(ifxmips_mii0_dev);
 213                 for (i = 0; i < dma_dev->max_tx_chan_num; i++) {
 214                         if ((dma_dev->tx_chan[i])->control == IFXMIPS_DMA_CH_ON)
 215                                 dma_dev->tx_chan[i]->enable_irq(dma_dev->tx_chan[i]);
 216                 }
 217                 break;
 218
 219         case TRANSMIT_CPT_INT:
 220                 for (i = 0; i < dma_dev->max_tx_chan_num; i++)
 221                         dma_dev->tx_chan[i]->disable_irq(dma_dev->tx_chan[i]);
 222
 223                 netif_wake_queue(ifxmips_mii0_dev);
 224                 break;
 225         }
 226
 227         return 0;
 228 }
 229
 230 unsigned char *ifxmips_etop_dma_buffer_alloc(int len, int *byte_offset, void **opt)
 231 {
 232         unsigned char *buffer = NULL;
 233         struct sk_buff *skb = NULL;
 234
 235         skb = dev_alloc_skb(ETHERNET_PACKET_DMA_BUFFER_SIZE);
 236         if (skb == NULL)
 237                 return NULL;
 238
 239         buffer = (unsigned char *)(skb->data);
 240         skb_reserve(skb, 2);
 241         *(int *)opt = (int)skb;
 242         *byte_offset = 2;
 243
 244         return buffer;
 245 }
 246
 247 void ifxmips_etop_dma_buffer_free(unsigned char *dataptr, void *opt)
 248 {
 249         struct sk_buff *skb = NULL;
 250
 251         if (opt == NULL) {
 252                 kfree(dataptr);
 253         } else {
 254                 skb = (struct sk_buff *)opt;
 255                 dev_kfree_skb_any(skb);
 256         }
 257 }
 258
 259 static struct net_device_stats *ifxmips_get_stats(struct net_device *dev)
 260 {
 261         return (struct net_device_stats *)dev->priv;
 262 }
 263
 264 static int ifxmips_mii_dev_init(struct net_device *dev)
 265 {
 266         int i;
 267         struct ifxmips_mii_priv *priv;
 268
 269         ether_setup(dev);
 270         printk(KERN_INFO "ifxmips_mii0: %s is up\n", dev->name);
 271         dev->open = ifxmips_ifxmips_mii_open;
 272         dev->stop = ifxmips_mii_release;
 273         dev->hard_start_xmit = ifxmips_mii_tx;
 274         dev->get_stats = ifxmips_get_stats;
 275         dev->tx_timeout = ifxmips_mii_tx_timeout;
 276         dev->watchdog_timeo = 10 * HZ;
 277         memset(dev->priv, 0, sizeof(struct ifxmips_mii_priv));
 278         priv = dev->priv;
 279         priv->dma_device = dma_device_reserve("PPE");
 280         if (!priv->dma_device) {
 281                 BUG();
 282                 return -ENODEV;
 283         }
 284         priv->dma_device->buffer_alloc = &ifxmips_etop_dma_buffer_alloc;
 285         priv->dma_device->buffer_free = &ifxmips_etop_dma_buffer_free;
 286         priv->dma_device->intr_handler = &dma_intr_handler;
 287         priv->dma_device->max_rx_chan_num = 4;
 288
 289         for (i = 0; i < priv->dma_device->max_rx_chan_num; i++) {
 290                 priv->dma_device->rx_chan[i]->packet_size = ETHERNET_PACKET_DMA_BUFFER_SIZE;
 291                 priv->dma_device->rx_chan[i]->control = IFXMIPS_DMA_CH_ON;
 292         }
 293
 294         for (i = 0; i < priv->dma_device->max_tx_chan_num; i++)
 295                 if (i == 0)
 296                         priv->dma_device->tx_chan[i]->control = IFXMIPS_DMA_CH_ON;
 297                 else
 298                         priv->dma_device->tx_chan[i]->control = IFXMIPS_DMA_CH_OFF;
 299
 300         dma_device_register(priv->dma_device);
 301
 302         printk(KERN_INFO "ifxmips_mii0: using mac=");
 303         for (i = 0; i < 6; i++) {
 304                 dev->dev_addr[i] = mac_addr[i];
 305                 printk("%02X%c", dev->dev_addr[i], (i == 5)?('\n'):(':'));
 306         }
 307         return 0;
 308 }
 309
 310 static void ifxmips_mii_chip_init(int mode)
 311 {
 312         ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_DMA);
 313         ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_PPE);
 314
 315         if (mode == REV_MII_MODE)
 316                 ifxmips_w32_mask(PPE32_MII_MASK, PPE32_MII_REVERSE, IFXMIPS_PPE32_CFG);
 317         else if (mode == MII_MODE)
 318                 ifxmips_w32_mask(PPE32_MII_MASK, PPE32_MII_NORMAL, IFXMIPS_PPE32_CFG);
 319         ifxmips_w32(PPE32_PLEN_UNDER | PPE32_PLEN_OVER, IFXMIPS_PPE32_IG_PLEN_CTRL);
 320         ifxmips_w32(PPE32_CGEN, IFXMIPS_PPE32_ENET_MAC_CFG);
 321         wmb();
 322 }
 323
 324 static int ifxmips_mii_probe(struct platform_device *dev)
 325 {
 326         int result = 0;
 327         unsigned char *mac = (unsigned char *)dev->dev.platform_data;
 328         ifxmips_mii0_dev = alloc_etherdev(sizeof(struct ifxmips_mii_priv));
 329         ifxmips_mii0_dev->init = ifxmips_mii_dev_init;
 330         memcpy(mac_addr, mac, 6);
 331         strcpy(ifxmips_mii0_dev->name, "eth%d");
 332         ifxmips_mii_chip_init(REV_MII_MODE);
 333         result = register_netdev(ifxmips_mii0_dev);
 334         if (result) {
 335                 printk(KERN_INFO "ifxmips_mii0: error %i registering device \"%s\"\n", result, ifxmips_mii0_dev->name);
 336                 goto out;
 337         }
 338
 339         printk(KERN_INFO "ifxmips_mii0: driver loaded!\n");
 340
 341 out:
 342         return result;
 343 }
 344
 345 static int ifxmips_mii_remove(struct platform_device *dev)
 346 {
 347         struct ifxmips_mii_priv *priv = (struct ifxmips_mii_priv *)ifxmips_mii0_dev->priv;
 348
 349         printk(KERN_INFO "ifxmips_mii0: ifxmips_mii0 cleanup\n");
 350
 351         dma_device_unregister(priv->dma_device);
 352         dma_device_release(priv->dma_device);
 353         kfree(priv->dma_device);
 354         kfree(ifxmips_mii0_dev->priv);
 355         unregister_netdev(ifxmips_mii0_dev);
 356         return 0;
 357 }
 358
 359 static struct platform_driver ifxmips_mii_driver = {
 360         .probe = ifxmips_mii_probe,
 361         .remove = ifxmips_mii_remove,
 362         .driver = {
 363                 .name = "ifxmips_mii0",
 364                 .owner = THIS_MODULE,
 365         },
 366 };
 367
 368 int __init ifxmips_mii_init(void)
 369 {
 370         int ret = platform_driver_register(&ifxmips_mii_driver);
 371         if (ret)
 372                 printk(KERN_INFO "ifxmips_mii0: Error registering platfom driver!");
 373         return ret;
 374 }
 375
 376 static void __exit ifxmips_mii_cleanup(void)
 377 {
 378         platform_driver_unregister(&ifxmips_mii_driver);
 379 }
 380
 381 module_init(ifxmips_mii_init);
 382 module_exit(ifxmips_mii_cleanup);
 383
 384 MODULE_LICENSE("GPL");
 385 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 386 MODULE_DESCRIPTION("ethernet map driver for IFXMIPS boards");
 387