target/linux/ramips/files/drivers/net/ramips.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; version 2 of the License
   5  *
   6  *   This program is distributed in the hope that it will be useful,
   7  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  *   GNU General Public License for more details.
  10  *
  11  *   You should have received a copy of the GNU General Public License
  12  *   along with this program; if not, write to the Free Software
  13  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  14  *
  15  *   Copyright (C) 2009 John Crispin <blogic@openwrt.org>
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/version.h>
  20 #include <linux/kernel.h>
  21 #include <linux/types.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/init.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/if_vlan.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/platform_device.h>
  28 #include <asm/uaccess.h>
  29 #include <net/sock.h>
  30 #include <asm/uaccess.h>
  31
  32 #include <eth.h>
  33
  34 #define TX_TIMEOUT (20 * HZ / 100)
  35 #define MAX_RX_LENGTH   1500
  36
  37 #ifdef CONFIG_RALINK_RT305X
  38 #include "ramips_esw.c"
  39 #endif
  40
  41 #define phys_to_bus(a)  (a & 0x1FFFFFFF)
  42
  43 static struct net_device * ramips_dev;
  44 static void __iomem *ramips_fe_base = 0;
  45
  46 static inline void
  47 ramips_fe_wr(u32 val, unsigned reg)
  48 {
  49         __raw_writel(val, ramips_fe_base + reg);
  50 }
  51
  52 static inline u32
  53 ramips_fe_rr(unsigned reg)
  54 {
  55         return __raw_readl(ramips_fe_base + reg);
  56 }
  57
  58 static int
  59 ramips_alloc_dma(struct net_device *dev)
  60 {
  61         struct raeth_priv *priv = netdev_priv(dev);
  62         int i;
  63
  64         priv->skb_free_idx = 0;
  65
  66         /* setup tx ring */
  67         priv->tx = dma_alloc_coherent(NULL,
  68                 NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
  69         for(i = 0; i < NUM_TX_DESC; i++)
  70         {
  71                 memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
  72                 priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
  73                 priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
  74                 priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
  75         }
  76         ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
  77         ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
  78         ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
  79         ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
  80
  81         /* setup rx ring */
  82         priv->rx = dma_alloc_coherent(NULL,
  83                 NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
  84         memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
  85         for(i = 0; i < NUM_RX_DESC; i++)
  86         {
  87                 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
  88                 BUG_ON(!new_skb);
  89                 skb_reserve(new_skb, 2);
  90                 priv->rx[i].rxd1 =
  91                         dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
  92                                 DMA_FROM_DEVICE);
  93                 priv->rx[i].rxd2 |= RX_DMA_LSO;
  94                 priv->rx_skb[i] = new_skb;
  95         }
  96         ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
  97         ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
  98         ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
  99         ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
 100
 101         return 0;
 102 }
 103
 104 static int
 105 ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
 106 {
 107         struct raeth_priv *priv = netdev_priv(dev);
 108         unsigned long tx;
 109         unsigned int tx_next;
 110         unsigned int mapped_addr;
 111         if(priv->plat->min_pkt_len)
 112         {
 113                 if(skb->len < priv->plat->min_pkt_len)
 114                  {
 115                      if(skb_padto(skb, priv->plat->min_pkt_len))
 116                          {
 117                                  printk(KERN_ERR "ramips_eth: skb_padto failed\n");
 118                                  kfree_skb(skb);
 119                                  return 0;
 120                          }
 121                      skb_put(skb, priv->plat->min_pkt_len - skb->len);
 122                  }
 123         }
 124         dev->trans_start = jiffies;
 125         mapped_addr = (unsigned int)dma_map_single(NULL, skb->data, skb->len,
 126                         DMA_TO_DEVICE);
 127         dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
 128         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
 129         if(tx == NUM_TX_DESC - 1)
 130                 tx_next = 0;
 131         else
 132                 tx_next = tx + 1;
 133         if((priv->tx_skb[tx]== 0) && (priv->tx_skb[tx_next] == 0))
 134         {
 135                 if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
 136                 {
 137                         kfree_skb(skb);
 138                         dev->stats.tx_dropped++;
 139                         printk(KERN_ERR "%s: dropping\n", dev->name);
 140                         return 0;
 141                 }
 142                 priv->tx[tx].txd1 = virt_to_phys(skb->data);
 143                 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
 144                 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
 145                 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 146                 dev->stats.tx_packets++;
 147                 dev->stats.tx_bytes += skb->len;
 148                 priv->tx_skb[tx] = skb;
 149                 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 150         } else {
 151                 dev->stats.tx_dropped++;
 152                 kfree_skb(skb);
 153         }
 154         return 0;
 155 }
 156
 157 static void
 158 ramips_eth_rx_hw(unsigned long ptr)
 159 {
 160         struct net_device *dev = (struct net_device*)ptr;
 161         struct raeth_priv *priv = netdev_priv(dev);
 162         int rx;
 163         int max_rx = 16;
 164
 165         while(max_rx)
 166         {
 167                 struct sk_buff *rx_skb, *new_skb;
 168
 169                 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
 170                 if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
 171                         break;
 172                 max_rx--;
 173
 174                 rx_skb = priv->rx_skb[rx];
 175                 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
 176                 rx_skb->tail = rx_skb->data + rx_skb->len;
 177                 rx_skb->dev = dev;
 178                 rx_skb->protocol = eth_type_trans(rx_skb, dev);
 179                 rx_skb->ip_summed = CHECKSUM_NONE;
 180                 dev->stats.rx_packets++;
 181                 dev->stats.rx_bytes += rx_skb->len;
 182                 netif_rx(rx_skb);
 183
 184                 new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
 185                 priv->rx_skb[rx] = new_skb;
 186                 BUG_ON(!new_skb);
 187                 skb_reserve(new_skb, 2);
 188                 priv->rx[rx].rxd1 =
 189                         dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
 190                         DMA_FROM_DEVICE);
 191                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
 192                 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
 193         }
 194         if(max_rx == 0)
 195                 tasklet_schedule(&priv->rx_tasklet);
 196         else
 197                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
 198                         RAMIPS_FE_INT_ENABLE);
 199 }
 200
 201 static void
 202 ramips_eth_tx_housekeeping(unsigned long ptr)
 203 {
 204         struct net_device *dev = (struct net_device*)ptr;
 205         struct raeth_priv *priv = netdev_priv(dev);
 206
 207         while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
 208                 (priv->tx_skb[priv->skb_free_idx]))
 209         {
 210                 dev_kfree_skb_irq((struct sk_buff*)priv->tx_skb[priv->skb_free_idx]);
 211                 priv->tx_skb[priv->skb_free_idx] = 0;
 212                 priv->skb_free_idx++;
 213                 if(priv->skb_free_idx >= NUM_TX_DESC)
 214                         priv->skb_free_idx = 0;
 215         }
 216         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
 217                 RAMIPS_FE_INT_ENABLE);
 218 }
 219
 220 static int
 221 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
 222 {
 223         unsigned char *mac = (unsigned char*)priv;
 224
 225         if(netif_running(dev))
 226                 return -EBUSY;
 227         memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
 228         ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
 229         ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
 230                 (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
 231         return 0;
 232 }
 233
 234 static void
 235 ramips_eth_timeout(struct net_device *dev)
 236 {
 237         struct raeth_priv *priv = netdev_priv(dev);
 238
 239         tasklet_schedule(&priv->tx_housekeeping_tasklet);
 240 }
 241
 242 static irqreturn_t
 243 ramips_eth_irq(int irq, void *dev)
 244 {
 245         struct raeth_priv *priv = netdev_priv(dev);
 246         unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
 247
 248         ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
 249
 250         if(fe_int & RAMIPS_RX_DLY_INT)
 251         {
 252                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
 253                         RAMIPS_FE_INT_ENABLE);
 254                 tasklet_schedule(&priv->rx_tasklet);
 255         }
 256         if(fe_int & RAMIPS_TX_DLY_INT)
 257                 ramips_eth_tx_housekeeping((unsigned long)dev);
 258         return IRQ_HANDLED;
 259 }
 260
 261 static int
 262 ramips_eth_open(struct net_device *dev)
 263 {
 264         struct raeth_priv *priv = netdev_priv(dev);
 265
 266         ramips_alloc_dma(dev);
 267         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 268                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 269                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
 270                 RAMIPS_PDMA_GLO_CFG);
 271         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
 272                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
 273                 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
 274                 RAMIPS_FE_GLO_CFG);
 275         request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED, dev->name, dev);
 276         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
 277                 (unsigned long)dev);
 278         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
 279         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
 280         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
 281         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
 282                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
 283                 RAMIPS_GDMA1_FWD_CFG);
 284         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
 285                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
 286                 RAMIPS_CDMA_CSG_CFG);
 287         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
 288         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
 289         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
 290         netif_start_queue(dev);
 291         return 0;
 292 }
 293
 294 static int
 295 ramips_eth_stop(struct net_device *dev)
 296 {
 297         struct raeth_priv *priv = netdev_priv(dev);
 298
 299         ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
 300                 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
 301         free_irq(dev->irq, dev);
 302         netif_stop_queue(dev);
 303         tasklet_kill(&priv->tx_housekeeping_tasklet);
 304         tasklet_kill(&priv->rx_tasklet);
 305         dma_free_coherent(NULL, NUM_TX_DESC * sizeof(struct ramips_tx_dma),
 306                 priv->tx, priv->phy_tx);
 307         dma_free_coherent(NULL, NUM_RX_DESC * sizeof(struct ramips_rx_dma),
 308                 priv->rx, priv->phy_rx);
 309         printk(KERN_DEBUG "ramips_eth: stopped\n");
 310         return 0;
 311 }
 312
 313 static int __init
 314 ramips_eth_probe(struct net_device *dev)
 315 {
 316         struct raeth_priv *priv = netdev_priv(dev);
 317         struct sockaddr addr;
 318
 319         BUG_ON(!priv->plat->reset_fe);
 320         priv->plat->reset_fe();
 321         net_srandom(jiffies);
 322         memcpy(addr.sa_data, priv->plat->mac, 6);
 323         ramips_eth_set_mac_addr(dev, &addr);
 324
 325         ether_setup(dev);
 326         dev->open = ramips_eth_open;
 327         dev->stop = ramips_eth_stop;
 328         dev->hard_start_xmit = ramips_eth_hard_start_xmit;
 329         dev->set_mac_address = ramips_eth_set_mac_addr;
 330         dev->mtu = MAX_RX_LENGTH;
 331         dev->tx_timeout = ramips_eth_timeout;
 332         dev->watchdog_timeo = TX_TIMEOUT;
 333         return 0;
 334 }
 335
 336 static int
 337 ramips_eth_plat_probe(struct platform_device *plat)
 338 {
 339         struct raeth_priv *priv;
 340         struct ramips_eth_platform_data *data = plat->dev.platform_data;
 341         struct resource *res;
 342         int err;
 343
 344         if (!data) {
 345                 dev_err(&plat->dev, "no platform data specified\n");
 346                 return -EINVAL;
 347         }
 348
 349         res = platform_get_resource(plat, IORESOURCE_MEM, 0);
 350         if (!res) {
 351                 dev_err(&plat->dev, "no memory resource found\n");
 352                 return -ENXIO;
 353         }
 354
 355         ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
 356         if(!ramips_fe_base)
 357                 return -ENOMEM;
 358
 359         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
 360         if(!ramips_dev) {
 361                 dev_err(&plat->dev, "alloc_etherdev failed\n");
 362                 err = -ENOMEM;
 363                 goto err_unmap;
 364         }
 365
 366         strcpy(ramips_dev->name, "eth%d");
 367         ramips_dev->irq = platform_get_irq(plat, 0);
 368         if (ramips_dev->irq < 0) {
 369                 dev_err(&plat->dev, "no IRQ resource found\n");
 370                 err = -ENXIO;
 371                 goto err_free_dev;
 372         }
 373         ramips_dev->addr_len = ETH_ALEN;
 374         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
 375         ramips_dev->init = ramips_eth_probe;
 376         priv = (struct raeth_priv*)netdev_priv(ramips_dev);
 377         priv->plat = data;
 378
 379         err = register_netdev(ramips_dev);
 380         if (err) {
 381                 dev_err(&plat->dev, "error bringing up device\n");
 382                 goto err_free_dev;
 383         }
 384
 385 #ifdef CONFIG_RALINK_RT305X
 386         rt305x_esw_init();
 387 #endif
 388         printk(KERN_DEBUG "ramips_eth: loaded\n");
 389         return 0;
 390
 391  err_free_dev:
 392         kfree(ramips_dev);
 393  err_unmap:
 394         iounmap(ramips_fe_base);
 395         return err;
 396 }
 397
 398 static int
 399 ramips_eth_plat_remove(struct platform_device *plat)
 400 {
 401         unregister_netdev(ramips_dev);
 402         free_netdev(ramips_dev);
 403         printk(KERN_DEBUG "ramips_eth: unloaded\n");
 404         return 0;
 405 }
 406
 407 static struct platform_driver ramips_eth_driver = {
 408         .probe = ramips_eth_plat_probe,
 409         .remove = ramips_eth_plat_remove,
 410         .driver = {
 411                 .name = "ramips_eth",
 412                 .owner = THIS_MODULE,
 413         },
 414 };
 415
 416 static int __init
 417 ramips_eth_init(void)
 418 {
 419         int ret = platform_driver_register(&ramips_eth_driver);
 420         if (ret)
 421                 printk(KERN_ERR
 422                        "ramips_eth: Error registering platfom driver!\n");
 423         return ret;
 424 }
 425
 426 static void __exit
 427 ramips_eth_cleanup(void)
 428 {
 429         platform_driver_unregister(&ramips_eth_driver);
 430 }
 431
 432 module_init(ramips_eth_init);
 433 module_exit(ramips_eth_cleanup);
 434
 435 MODULE_LICENSE("GPL");
 436 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 437 MODULE_DESCRIPTION("ethernet driver for ramips boards");