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/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/init.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/platform_device.h>
  26
  27 #include <eth.h>
  28
  29 #define TX_TIMEOUT (20 * HZ / 100)
  30 #define MAX_RX_LENGTH   1500
  31
  32 #ifdef CONFIG_RALINK_RT305X
  33 #include "ramips_esw.c"
  34 #endif
  35
  36 #define phys_to_bus(a)  (a & 0x1FFFFFFF)
  37
  38 static struct net_device * ramips_dev;
  39 static void __iomem *ramips_fe_base = 0;
  40
  41 static inline void
  42 ramips_fe_wr(u32 val, unsigned reg)
  43 {
  44         __raw_writel(val, ramips_fe_base + reg);
  45 }
  46
  47 static inline u32
  48 ramips_fe_rr(unsigned reg)
  49 {
  50         return __raw_readl(ramips_fe_base + reg);
  51 }
  52
  53 static void
  54 ramips_cleanup_dma(struct net_device *dev)
  55 {
  56         struct raeth_priv *priv = netdev_priv(dev);
  57
  58         dma_free_coherent(NULL, NUM_RX_DESC * sizeof(struct ramips_rx_dma),
  59                 priv->rx, priv->phy_rx);
  60
  61         dma_free_coherent(NULL, NUM_TX_DESC * sizeof(struct ramips_tx_dma),
  62                 priv->tx, priv->phy_tx);
  63 }
  64
  65 static int
  66 ramips_alloc_dma(struct net_device *dev)
  67 {
  68         struct raeth_priv *priv = netdev_priv(dev);
  69         int i;
  70
  71         priv->skb_free_idx = 0;
  72
  73         /* setup tx ring */
  74         priv->tx = dma_alloc_coherent(NULL,
  75                 NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
  76         for(i = 0; i < NUM_TX_DESC; i++)
  77         {
  78                 memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
  79                 priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
  80                 priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
  81                 priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
  82         }
  83
  84         /* setup rx ring */
  85         priv->rx = dma_alloc_coherent(NULL,
  86                 NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
  87         memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
  88         for(i = 0; i < NUM_RX_DESC; i++)
  89         {
  90                 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
  91                 BUG_ON(!new_skb);
  92                 skb_reserve(new_skb, 2);
  93                 priv->rx[i].rxd1 =
  94                         dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
  95                                 DMA_FROM_DEVICE);
  96                 priv->rx[i].rxd2 |= RX_DMA_LSO;
  97                 priv->rx_skb[i] = new_skb;
  98         }
  99
 100         return 0;
 101 }
 102
 103 static void
 104 ramips_setup_dma(struct net_device *dev)
 105 {
 106         struct raeth_priv *priv = netdev_priv(dev);
 107
 108         ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
 109         ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
 110         ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
 111         ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
 112
 113         ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
 114         ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
 115         ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
 116         ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
 117 }
 118
 119 static int
 120 ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
 121 {
 122         struct raeth_priv *priv = netdev_priv(dev);
 123         unsigned long tx;
 124         unsigned int tx_next;
 125         unsigned int mapped_addr;
 126         if(priv->plat->min_pkt_len)
 127         {
 128                 if(skb->len < priv->plat->min_pkt_len)
 129                  {
 130                      if(skb_padto(skb, priv->plat->min_pkt_len))
 131                          {
 132                                  printk(KERN_ERR "ramips_eth: skb_padto failed\n");
 133                                  kfree_skb(skb);
 134                                  return 0;
 135                          }
 136                      skb_put(skb, priv->plat->min_pkt_len - skb->len);
 137                  }
 138         }
 139         dev->trans_start = jiffies;
 140         mapped_addr = (unsigned int)dma_map_single(NULL, skb->data, skb->len,
 141                         DMA_TO_DEVICE);
 142         dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
 143         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
 144         if(tx == NUM_TX_DESC - 1)
 145                 tx_next = 0;
 146         else
 147                 tx_next = tx + 1;
 148         if((priv->tx_skb[tx]== 0) && (priv->tx_skb[tx_next] == 0))
 149         {
 150                 if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
 151                 {
 152                         kfree_skb(skb);
 153                         dev->stats.tx_dropped++;
 154                         printk(KERN_ERR "%s: dropping\n", dev->name);
 155                         return 0;
 156                 }
 157                 priv->tx[tx].txd1 = virt_to_phys(skb->data);
 158                 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
 159                 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
 160                 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 161                 dev->stats.tx_packets++;
 162                 dev->stats.tx_bytes += skb->len;
 163                 priv->tx_skb[tx] = skb;
 164                 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 165         } else {
 166                 dev->stats.tx_dropped++;
 167                 kfree_skb(skb);
 168         }
 169         return 0;
 170 }
 171
 172 static void
 173 ramips_eth_rx_hw(unsigned long ptr)
 174 {
 175         struct net_device *dev = (struct net_device*)ptr;
 176         struct raeth_priv *priv = netdev_priv(dev);
 177         int rx;
 178         int max_rx = 16;
 179
 180         while(max_rx)
 181         {
 182                 struct sk_buff *rx_skb, *new_skb;
 183
 184                 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
 185                 if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
 186                         break;
 187                 max_rx--;
 188
 189                 rx_skb = priv->rx_skb[rx];
 190                 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
 191                 rx_skb->tail = rx_skb->data + rx_skb->len;
 192                 rx_skb->dev = dev;
 193                 rx_skb->protocol = eth_type_trans(rx_skb, dev);
 194                 rx_skb->ip_summed = CHECKSUM_NONE;
 195                 dev->stats.rx_packets++;
 196                 dev->stats.rx_bytes += rx_skb->len;
 197                 netif_rx(rx_skb);
 198
 199                 new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
 200                 priv->rx_skb[rx] = new_skb;
 201                 BUG_ON(!new_skb);
 202                 skb_reserve(new_skb, 2);
 203                 priv->rx[rx].rxd1 =
 204                         dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
 205                         DMA_FROM_DEVICE);
 206                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
 207                 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
 208         }
 209         if(max_rx == 0)
 210                 tasklet_schedule(&priv->rx_tasklet);
 211         else
 212                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
 213                         RAMIPS_FE_INT_ENABLE);
 214 }
 215
 216 static void
 217 ramips_eth_tx_housekeeping(unsigned long ptr)
 218 {
 219         struct net_device *dev = (struct net_device*)ptr;
 220         struct raeth_priv *priv = netdev_priv(dev);
 221
 222         while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
 223                 (priv->tx_skb[priv->skb_free_idx]))
 224         {
 225                 dev_kfree_skb_irq((struct sk_buff*)priv->tx_skb[priv->skb_free_idx]);
 226                 priv->tx_skb[priv->skb_free_idx] = 0;
 227                 priv->skb_free_idx++;
 228                 if(priv->skb_free_idx >= NUM_TX_DESC)
 229                         priv->skb_free_idx = 0;
 230         }
 231         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
 232                 RAMIPS_FE_INT_ENABLE);
 233 }
 234
 235 static int
 236 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
 237 {
 238         unsigned char *mac = (unsigned char*)priv;
 239
 240         if(netif_running(dev))
 241                 return -EBUSY;
 242         memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
 243         ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
 244         ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
 245                 (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
 246         return 0;
 247 }
 248
 249 static void
 250 ramips_eth_timeout(struct net_device *dev)
 251 {
 252         struct raeth_priv *priv = netdev_priv(dev);
 253
 254         tasklet_schedule(&priv->tx_housekeeping_tasklet);
 255 }
 256
 257 static irqreturn_t
 258 ramips_eth_irq(int irq, void *dev)
 259 {
 260         struct raeth_priv *priv = netdev_priv(dev);
 261         unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
 262
 263         ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
 264
 265         if(fe_int & RAMIPS_RX_DLY_INT)
 266         {
 267                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
 268                         RAMIPS_FE_INT_ENABLE);
 269                 tasklet_schedule(&priv->rx_tasklet);
 270         }
 271         if(fe_int & RAMIPS_TX_DLY_INT)
 272                 ramips_eth_tx_housekeeping((unsigned long)dev);
 273         return IRQ_HANDLED;
 274 }
 275
 276 static int
 277 ramips_eth_open(struct net_device *dev)
 278 {
 279         struct raeth_priv *priv = netdev_priv(dev);
 280
 281         ramips_alloc_dma(dev);
 282         ramips_setup_dma(dev);
 283         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 284                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 285                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
 286                 RAMIPS_PDMA_GLO_CFG);
 287         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
 288                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
 289                 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
 290                 RAMIPS_FE_GLO_CFG);
 291         request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED, dev->name, dev);
 292         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
 293                 (unsigned long)dev);
 294         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
 295         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
 296         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
 297         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
 298                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
 299                 RAMIPS_GDMA1_FWD_CFG);
 300         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
 301                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
 302                 RAMIPS_CDMA_CSG_CFG);
 303         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
 304         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
 305         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
 306         netif_start_queue(dev);
 307         return 0;
 308 }
 309
 310 static int
 311 ramips_eth_stop(struct net_device *dev)
 312 {
 313         struct raeth_priv *priv = netdev_priv(dev);
 314
 315         ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
 316                 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
 317         free_irq(dev->irq, dev);
 318         netif_stop_queue(dev);
 319         tasklet_kill(&priv->tx_housekeeping_tasklet);
 320         tasklet_kill(&priv->rx_tasklet);
 321         ramips_cleanup_dma(dev);
 322         printk(KERN_DEBUG "ramips_eth: stopped\n");
 323         return 0;
 324 }
 325
 326 static int __init
 327 ramips_eth_probe(struct net_device *dev)
 328 {
 329         struct raeth_priv *priv = netdev_priv(dev);
 330         struct sockaddr addr;
 331
 332         BUG_ON(!priv->plat->reset_fe);
 333         priv->plat->reset_fe();
 334         net_srandom(jiffies);
 335         memcpy(addr.sa_data, priv->plat->mac, 6);
 336         ramips_eth_set_mac_addr(dev, &addr);
 337
 338         ether_setup(dev);
 339         dev->open = ramips_eth_open;
 340         dev->stop = ramips_eth_stop;
 341         dev->hard_start_xmit = ramips_eth_hard_start_xmit;
 342         dev->set_mac_address = ramips_eth_set_mac_addr;
 343         dev->mtu = MAX_RX_LENGTH;
 344         dev->tx_timeout = ramips_eth_timeout;
 345         dev->watchdog_timeo = TX_TIMEOUT;
 346         return 0;
 347 }
 348
 349 static int
 350 ramips_eth_plat_probe(struct platform_device *plat)
 351 {
 352         struct raeth_priv *priv;
 353         struct ramips_eth_platform_data *data = plat->dev.platform_data;
 354         struct resource *res;
 355         int err;
 356
 357         if (!data) {
 358                 dev_err(&plat->dev, "no platform data specified\n");
 359                 return -EINVAL;
 360         }
 361
 362         res = platform_get_resource(plat, IORESOURCE_MEM, 0);
 363         if (!res) {
 364                 dev_err(&plat->dev, "no memory resource found\n");
 365                 return -ENXIO;
 366         }
 367
 368         ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
 369         if(!ramips_fe_base)
 370                 return -ENOMEM;
 371
 372         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
 373         if(!ramips_dev) {
 374                 dev_err(&plat->dev, "alloc_etherdev failed\n");
 375                 err = -ENOMEM;
 376                 goto err_unmap;
 377         }
 378
 379         strcpy(ramips_dev->name, "eth%d");
 380         ramips_dev->irq = platform_get_irq(plat, 0);
 381         if (ramips_dev->irq < 0) {
 382                 dev_err(&plat->dev, "no IRQ resource found\n");
 383                 err = -ENXIO;
 384                 goto err_free_dev;
 385         }
 386         ramips_dev->addr_len = ETH_ALEN;
 387         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
 388         ramips_dev->init = ramips_eth_probe;
 389         priv = (struct raeth_priv*)netdev_priv(ramips_dev);
 390         priv->plat = data;
 391
 392         err = register_netdev(ramips_dev);
 393         if (err) {
 394                 dev_err(&plat->dev, "error bringing up device\n");
 395                 goto err_free_dev;
 396         }
 397
 398 #ifdef CONFIG_RALINK_RT305X
 399         rt305x_esw_init();
 400 #endif
 401         printk(KERN_DEBUG "ramips_eth: loaded\n");
 402         return 0;
 403
 404  err_free_dev:
 405         kfree(ramips_dev);
 406  err_unmap:
 407         iounmap(ramips_fe_base);
 408         return err;
 409 }
 410
 411 static int
 412 ramips_eth_plat_remove(struct platform_device *plat)
 413 {
 414         unregister_netdev(ramips_dev);
 415         free_netdev(ramips_dev);
 416         printk(KERN_DEBUG "ramips_eth: unloaded\n");
 417         return 0;
 418 }
 419
 420 static struct platform_driver ramips_eth_driver = {
 421         .probe = ramips_eth_plat_probe,
 422         .remove = ramips_eth_plat_remove,
 423         .driver = {
 424                 .name = "ramips_eth",
 425                 .owner = THIS_MODULE,
 426         },
 427 };
 428
 429 static int __init
 430 ramips_eth_init(void)
 431 {
 432         int ret = platform_driver_register(&ramips_eth_driver);
 433         if (ret)
 434                 printk(KERN_ERR
 435                        "ramips_eth: Error registering platfom driver!\n");
 436         return ret;
 437 }
 438
 439 static void __exit
 440 ramips_eth_cleanup(void)
 441 {
 442         platform_driver_unregister(&ramips_eth_driver);
 443 }
 444
 445 module_init(ramips_eth_init);
 446 module_exit(ramips_eth_cleanup);
 447
 448 MODULE_LICENSE("GPL");
 449 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 450 MODULE_DESCRIPTION("ethernet driver for ramips boards");