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

   1 /*
   2  *   drivers/net/ifxmips_mii0.c
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation; either version 2 of the License, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program; if not, write to the Free Software
  16  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  *   Copyright (C) 2005 Infineon
  19  *
  20  *   Rewrite of Infineon IFXMips code, thanks to infineon for the support,
  21  *   software and hardware
  22  *
  23  *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
  24  *
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/errno.h>
  30 #include <linux/types.h>
  31 #include <linux/interrupt.h>
  32 #include <asm/uaccess.h>
  33 #include <linux/in.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/etherdevice.h>
  36 #include <linux/ip.h>
  37 #include <linux/tcp.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/mm.h>
  40 #include <linux/platform_device.h>
  41 #include <linux/ethtool.h>
  42 #include <asm/checksum.h>
  43 #include <linux/init.h>
  44 #include <asm/delay.h>
  45 #include <asm/ifxmips/ifxmips.h>
  46 #include <asm/ifxmips/ifxmips_mii0.h>
  47 #include <asm/ifxmips/ifxmips_dma.h>
  48 #include <asm/ifxmips/ifxmips_pmu.h>
  49
  50 #define DRVNAME         "ifxmips_mii0"
  51
  52 static struct net_device ifxmips_mii0_dev;
  53 static unsigned char u_boot_ethaddr[MAX_ADDR_LEN];
  54
  55 void
  56 ifxmips_write_mdio (u32 phy_addr, u32 phy_reg, u16 phy_data)
  57 {
  58         u32 val = MDIO_ACC_REQUEST |
  59                 ((phy_addr & MDIO_ACC_ADDR_MASK) << MDIO_ACC_ADDR_OFFSET) |
  60                 ((phy_reg & MDIO_ACC_REG_MASK) << MDIO_ACC_REG_OFFSET) |
  61                 phy_data;
  62
  63         while (readl(IFXMIPS_PPE32_MDIO_ACC) & MDIO_ACC_REQUEST);
  64         writel(val, IFXMIPS_PPE32_MDIO_ACC);
  65 }
  66
  67 unsigned short
  68 ifxmips_read_mdio (u32 phy_addr, u32 phy_reg)
  69 {
  70         u32 val = MDIO_ACC_REQUEST | MDIO_ACC_READ |
  71                 ((phy_addr & MDIO_ACC_ADDR_MASK) << MDIO_ACC_ADDR_OFFSET) |
  72                 ((phy_reg & MDIO_ACC_REG_MASK) << MDIO_ACC_REG_OFFSET);
  73
  74         writel(val, IFXMIPS_PPE32_MDIO_ACC);
  75         while (readl(IFXMIPS_PPE32_MDIO_ACC) & MDIO_ACC_REQUEST){};
  76         val = readl(IFXMIPS_PPE32_MDIO_ACC) & MDIO_ACC_VAL_MASK;
  77
  78         return val;
  79 }
  80
  81 int
  82 ifxmips_switch_open (struct net_device *dev)
  83 {
  84         struct switch_priv* priv = (struct switch_priv*)dev->priv;
  85         struct dma_device_info* dma_dev = priv->dma_device;
  86         int i;
  87
  88         for (i = 0; i < dma_dev->max_rx_chan_num; i++)
  89         {
  90                 if ((dma_dev->rx_chan[i])->control == IFXMIPS_DMA_CH_ON)
  91                         (dma_dev->rx_chan[i])->open(dma_dev->rx_chan[i]);
  92         }
  93
  94         netif_start_queue(dev);
  95
  96         return 0;
  97 }
  98
  99 int
 100 switch_release (struct net_device *dev){
 101         struct switch_priv* priv = (struct switch_priv*)dev->priv;
 102         struct dma_device_info* dma_dev = priv->dma_device;
 103         int i;
 104
 105         for (i = 0; i < dma_dev->max_rx_chan_num; i++)
 106                 dma_dev->rx_chan[i]->close(dma_dev->rx_chan[i]);
 107
 108         netif_stop_queue(dev);
 109
 110         return 0;
 111 }
 112
 113 int
 114 switch_hw_receive (struct net_device* dev,struct dma_device_info* dma_dev)
 115 {
 116         struct switch_priv *priv = (struct switch_priv*)dev->priv;
 117         unsigned char* buf = NULL;
 118         struct sk_buff *skb = NULL;
 119         int len = 0;
 120
 121         len = dma_device_read(dma_dev, &buf, (void**)&skb);
 122
 123         if (len >= ETHERNET_PACKET_DMA_BUFFER_SIZE)
 124         {
 125                 printk(KERN_INFO DRVNAME ": packet too large %d\n",len);
 126                 goto switch_hw_receive_err_exit;
 127         }
 128
 129         /* remove CRC */
 130         len -= 4;
 131         if (skb == NULL )
 132         {
 133                 printk(KERN_INFO DRVNAME ": cannot restore pointer\n");
 134                 goto switch_hw_receive_err_exit;
 135         }
 136
 137         if (len > (skb->end - skb->tail))
 138         {
 139                 printk(KERN_INFO DRVNAME ": BUG, len:%d end:%p tail:%p\n", (len+4), skb->end, skb->tail);
 140                 goto switch_hw_receive_err_exit;
 141         }
 142
 143         skb_put(skb, len);
 144         skb->dev = dev;
 145         skb->protocol = eth_type_trans(skb, dev);
 146         netif_rx(skb);
 147
 148         priv->stats.rx_packets++;
 149         priv->stats.rx_bytes += len;
 150
 151         return 0;
 152
 153 switch_hw_receive_err_exit:
 154         if (len == 0)
 155         {
 156                 if(skb)
 157                         dev_kfree_skb_any(skb);
 158                 priv->stats.rx_errors++;
 159                 priv->stats.rx_dropped++;
 160
 161                 return -EIO;
 162         } else {
 163                 return len;
 164         }
 165 }
 166
 167 int
 168 switch_hw_tx (char *buf, int len, struct net_device *dev)
 169 {
 170         int ret = 0;
 171         struct switch_priv *priv = dev->priv;
 172         struct dma_device_info* dma_dev = priv->dma_device;
 173
 174         ret = dma_device_write(dma_dev, buf, len, priv->skb);
 175
 176         return ret;
 177 }
 178
 179 int
 180 switch_tx (struct sk_buff *skb, struct net_device *dev)
 181 {
 182         int len;
 183         char *data;
 184         struct switch_priv *priv = dev->priv;
 185         struct dma_device_info* dma_dev = priv->dma_device;
 186
 187         len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
 188         data = skb->data;
 189         priv->skb = skb;
 190         dev->trans_start = jiffies;
 191         // TODO we got more than 1 dma channel, so we should do something intelligent
 192         // here to select one
 193         dma_dev->current_tx_chan = 0;
 194
 195         wmb();
 196
 197         if (switch_hw_tx(data, len, dev) != len)
 198         {
 199                 dev_kfree_skb_any(skb);
 200                 priv->stats.tx_errors++;
 201                 priv->stats.tx_dropped++;
 202         } else {
 203                 priv->stats.tx_packets++;
 204                 priv->stats.tx_bytes+=len;
 205         }
 206
 207         return 0;
 208 }
 209
 210 void
 211 switch_tx_timeout (struct net_device *dev)
 212 {
 213         int i;
 214         struct switch_priv* priv = (struct switch_priv*)dev->priv;
 215
 216         priv->stats.tx_errors++;
 217
 218         for (i = 0; i < priv->dma_device->max_tx_chan_num; i++)
 219         {
 220                 priv->dma_device->tx_chan[i]->disable_irq(priv->dma_device->tx_chan[i]);
 221         }
 222
 223         netif_wake_queue(dev);
 224
 225         return;
 226 }
 227
 228 int
 229 dma_intr_handler (struct dma_device_info* dma_dev, int status)
 230 {
 231         int i;
 232
 233         switch (status)
 234         {
 235         case RCV_INT:
 236                 switch_hw_receive(&ifxmips_mii0_dev, dma_dev);
 237                 break;
 238
 239         case TX_BUF_FULL_INT:
 240                 printk(KERN_INFO DRVNAME ": tx buffer full\n");
 241                 netif_stop_queue(&ifxmips_mii0_dev);
 242                 for (i = 0; i < dma_dev->max_tx_chan_num; i++)
 243                 {
 244                         if ((dma_dev->tx_chan[i])->control==IFXMIPS_DMA_CH_ON)
 245                                 dma_dev->tx_chan[i]->enable_irq(dma_dev->tx_chan[i]);
 246                 }
 247                 break;
 248
 249         case TRANSMIT_CPT_INT:
 250                 for (i = 0; i < dma_dev->max_tx_chan_num; i++)
 251                         dma_dev->tx_chan[i]->disable_irq(dma_dev->tx_chan[i]);
 252
 253                 netif_wake_queue(&ifxmips_mii0_dev);
 254                 break;
 255         }
 256
 257         return 0;
 258 }
 259
 260 unsigned char*
 261 ifxmips_etop_dma_buffer_alloc (int len, int *byte_offset, void **opt)
 262 {
 263         unsigned char *buffer = NULL;
 264         struct sk_buff *skb = NULL;
 265
 266         skb = dev_alloc_skb(ETHERNET_PACKET_DMA_BUFFER_SIZE);
 267         if (skb == NULL)
 268                 return NULL;
 269
 270         buffer = (unsigned char*)(skb->data);
 271         skb_reserve(skb, 2);
 272         *(int*)opt = (int)skb;
 273         *byte_offset = 2;
 274
 275         return buffer;
 276 }
 277
 278 void
 279 ifxmips_etop_dma_buffer_free (unsigned char *dataptr, void *opt)
 280 {
 281         struct sk_buff *skb = NULL;
 282
 283         if(opt == NULL)
 284         {
 285                 kfree(dataptr);
 286         } else {
 287                 skb = (struct sk_buff*)opt;
 288                 dev_kfree_skb_any(skb);
 289         }
 290 }
 291
 292 static struct net_device_stats*
 293 ifxmips_get_stats (struct net_device *dev)
 294 {
 295         return (struct net_device_stats *)dev->priv;
 296 }
 297
 298 static int
 299 switch_init (struct net_device *dev)
 300 {
 301         u64 retval = 0;
 302         int i;
 303         struct switch_priv *priv;
 304
 305         ether_setup(dev);
 306
 307         printk(KERN_INFO DRVNAME ": %s is up\n", dev->name);
 308
 309         dev->open = ifxmips_switch_open;
 310         dev->stop = switch_release;
 311         dev->hard_start_xmit = switch_tx;
 312         dev->get_stats = ifxmips_get_stats;
 313         dev->tx_timeout = switch_tx_timeout;
 314         dev->watchdog_timeo = 10 * HZ;
 315         dev->priv = kmalloc(sizeof(struct switch_priv), GFP_KERNEL);
 316
 317         if (dev->priv == NULL)
 318                 return -ENOMEM;
 319
 320         memset(dev->priv, 0, sizeof(struct switch_priv));
 321         priv = dev->priv;
 322
 323         priv->dma_device = dma_device_reserve("PPE");
 324
 325         if (!priv->dma_device){
 326                 BUG();
 327                 return -ENODEV;
 328         }
 329
 330         priv->dma_device->buffer_alloc = &ifxmips_etop_dma_buffer_alloc;
 331         priv->dma_device->buffer_free = &ifxmips_etop_dma_buffer_free;
 332         priv->dma_device->intr_handler = &dma_intr_handler;
 333         priv->dma_device->max_rx_chan_num = 4;
 334
 335         for (i = 0; i < priv->dma_device->max_rx_chan_num; i++)
 336         {
 337                 priv->dma_device->rx_chan[i]->packet_size = ETHERNET_PACKET_DMA_BUFFER_SIZE;
 338                 priv->dma_device->rx_chan[i]->control = IFXMIPS_DMA_CH_ON;
 339         }
 340
 341         for (i = 0; i < priv->dma_device->max_tx_chan_num; i++)
 342         {
 343                 if(i == 0)
 344                         priv->dma_device->tx_chan[i]->control = IFXMIPS_DMA_CH_ON;
 345                 else
 346                         priv->dma_device->tx_chan[i]->control = IFXMIPS_DMA_CH_OFF;
 347         }
 348
 349         dma_device_register(priv->dma_device);
 350
 351         /*read the mac address from the mac table and put them into the mac table.*/
 352         for (i = 0; i < 6; i++)
 353                 retval += u_boot_ethaddr[i];
 354
 355         //TODO
 356         /* ethaddr not set in u-boot ? */
 357         if (retval == 0)
 358         {
 359                 printk(KERN_INFO DRVNAME ": using default MAC address\n");
 360                 dev->dev_addr[0] = 0x00;
 361                 dev->dev_addr[1] = 0x11;
 362                 dev->dev_addr[2] = 0x22;
 363                 dev->dev_addr[3] = 0x33;
 364                 dev->dev_addr[4] = 0x44;
 365                 dev->dev_addr[5] = 0x55;
 366         } else {
 367                 for (i = 0; i < 6; i++)
 368                         dev->dev_addr[i] = u_boot_ethaddr[i];
 369         }
 370
 371         return 0;
 372 }
 373
 374 static void
 375 ifxmips_sw_chip_init (int mode)
 376 {
 377         ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_DMA);
 378         ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_PPE);
 379
 380         if(mode == REV_MII_MODE)
 381                 writel((readl(IFXMIPS_PPE32_CFG) & PPE32_MII_MASK) | PPE32_MII_REVERSE, IFXMIPS_PPE32_CFG);
 382         else if(mode == MII_MODE)
 383                 writel((readl(IFXMIPS_PPE32_CFG) & PPE32_MII_MASK) | PPE32_MII_NORMAL, IFXMIPS_PPE32_CFG);
 384
 385         writel(PPE32_PLEN_UNDER | PPE32_PLEN_OVER, IFXMIPS_PPE32_IG_PLEN_CTRL);
 386
 387         writel(PPE32_CGEN, IFXMIPS_PPE32_ENET_MAC_CFG);
 388
 389         wmb();
 390 }
 391
 392 static int
 393 ifxmips_mii_probe(struct platform_device *dev)
 394 {
 395         int result = 0;
 396
 397         ifxmips_mii0_dev.init = switch_init;
 398
 399         strcpy(ifxmips_mii0_dev.name, "eth%d");
 400         SET_MODULE_OWNER(dev);
 401
 402         result = register_netdev(&ifxmips_mii0_dev);
 403         if (result)
 404         {
 405                 printk(KERN_INFO DRVNAME ": error %i registering device \"%s\"\n", result, ifxmips_mii0_dev.name);
 406                 goto out;
 407         }
 408
 409         /* ifxmips eval kit connects the phy/switch in REV mode */
 410         ifxmips_sw_chip_init(REV_MII_MODE);
 411         printk(KERN_INFO DRVNAME ": driver loaded!\n");
 412
 413 out:
 414         return result;
 415 }
 416
 417 static int
 418 ifxmips_mii_remove(struct platform_device *dev)
 419 {
 420         struct switch_priv *priv = (struct switch_priv*)ifxmips_mii0_dev.priv;
 421
 422         printk(KERN_INFO DRVNAME ": ifxmips_mii0 cleanup\n");
 423
 424         dma_device_unregister(priv->dma_device);
 425         dma_device_release(priv->dma_device);
 426         kfree(priv->dma_device);
 427         kfree(ifxmips_mii0_dev.priv);
 428         unregister_netdev(&ifxmips_mii0_dev);
 429
 430         return 0;
 431 }
 432
 433 static struct
 434 platform_driver ifxmips_mii_driver = {
 435         .probe = ifxmips_mii_probe,
 436         .remove = ifxmips_mii_remove,
 437         .driver = {
 438                 .name = DRVNAME,
 439                 .owner = THIS_MODULE,
 440         },
 441 };
 442
 443 int __init
 444 ifxmips_mii_init(void)
 445 {
 446         int ret = platform_driver_register(&ifxmips_mii_driver);
 447         if (ret)
 448                 printk(KERN_INFO DRVNAME ": Error registering platfom driver!");
 449
 450         return ret;
 451 }
 452
 453 static void __exit
 454 ifxmips_mii_cleanup(void)
 455 {
 456         platform_driver_unregister(&ifxmips_mii_driver);
 457 }
 458
 459 module_init(ifxmips_mii_init);
 460 module_exit(ifxmips_mii_cleanup);