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 <ramips_eth_platform.h>
  28 #include "ramips_eth.h"
  29
  30 #define TX_TIMEOUT (20 * HZ / 100)
  31 #define MAX_RX_LENGTH   1600
  32
  33 #ifdef CONFIG_RALINK_RT305X
  34 #include "ramips_esw.c"
  35 #endif
  36
  37 #define phys_to_bus(a)  (a & 0x1FFFFFFF)
  38
  39 static struct net_device * ramips_dev;
  40 static void __iomem *ramips_fe_base = 0;
  41
  42 static inline void
  43 ramips_fe_wr(u32 val, unsigned reg)
  44 {
  45         __raw_writel(val, ramips_fe_base + reg);
  46 }
  47
  48 static inline u32
  49 ramips_fe_rr(unsigned reg)
  50 {
  51         return __raw_readl(ramips_fe_base + reg);
  52 }
  53
  54 static void
  55 ramips_cleanup_dma(struct raeth_priv *re)
  56 {
  57         int i;
  58
  59         for (i = 0; i < NUM_RX_DESC; i++)
  60                 if (re->rx_skb[i])
  61                         dev_kfree_skb_any(re->rx_skb[i]);
  62
  63         if (re->rx)
  64                 dma_free_coherent(NULL,
  65                                   NUM_RX_DESC * sizeof(struct ramips_rx_dma),
  66                                   re->rx, re->phy_rx);
  67
  68         if (re->tx)
  69                 dma_free_coherent(NULL,
  70                                   NUM_TX_DESC * sizeof(struct ramips_tx_dma),
  71                                   re->tx, re->phy_tx);
  72 }
  73
  74 static int
  75 ramips_alloc_dma(struct raeth_priv *re)
  76 {
  77         int err = -ENOMEM;
  78         int i;
  79
  80         re->skb_free_idx = 0;
  81
  82         /* setup tx ring */
  83         re->tx = dma_alloc_coherent(NULL,
  84                                     NUM_TX_DESC * sizeof(struct ramips_tx_dma),
  85                                     &re->phy_tx, GFP_ATOMIC);
  86         if (!re->tx)
  87                 goto err_cleanup;
  88
  89         memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
  90         for (i = 0; i < NUM_TX_DESC; i++) {
  91                 re->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
  92                 re->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
  93                 re->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
  94         }
  95
  96         /* setup rx ring */
  97         re->rx = dma_alloc_coherent(NULL,
  98                                     NUM_RX_DESC * sizeof(struct ramips_rx_dma),
  99                                     &re->phy_rx, GFP_ATOMIC);
 100         if (!re->rx)
 101                 goto err_cleanup;
 102
 103         memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
 104         for (i = 0; i < NUM_RX_DESC; i++) {
 105                 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
 106
 107                 if (!new_skb)
 108                         goto err_cleanup;
 109
 110                 skb_reserve(new_skb, 2);
 111                 re->rx[i].rxd1 = dma_map_single(NULL,
 112                                                 skb_put(new_skb, 2),
 113                                                 MAX_RX_LENGTH + 2,
 114                                                 DMA_FROM_DEVICE);
 115                 re->rx[i].rxd2 |= RX_DMA_LSO;
 116                 re->rx_skb[i] = new_skb;
 117         }
 118
 119         return 0;
 120
 121  err_cleanup:
 122         ramips_cleanup_dma(re);
 123         return err;
 124 }
 125
 126 static void
 127 ramips_setup_dma(struct raeth_priv *re)
 128 {
 129         ramips_fe_wr(phys_to_bus(re->phy_tx), RAMIPS_TX_BASE_PTR0);
 130         ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
 131         ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
 132         ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
 133
 134         ramips_fe_wr(phys_to_bus(re->phy_rx), RAMIPS_RX_BASE_PTR0);
 135         ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
 136         ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
 137         ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
 138 }
 139
 140 static int
 141 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 142 {
 143         struct raeth_priv *priv = netdev_priv(dev);
 144         unsigned long tx;
 145         unsigned int tx_next;
 146         unsigned int mapped_addr;
 147         unsigned long flags;
 148
 149         if (priv->plat->min_pkt_len) {
 150                 if (skb->len < priv->plat->min_pkt_len) {
 151                         if (skb_padto(skb, priv->plat->min_pkt_len)) {
 152                                 printk(KERN_ERR
 153                                        "ramips_eth: skb_padto failed\n");
 154                                 kfree_skb(skb);
 155                                 return 0;
 156                         }
 157                         skb_put(skb, priv->plat->min_pkt_len - skb->len);
 158                 }
 159         }
 160
 161         dev->trans_start = jiffies;
 162         mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
 163                                                     DMA_TO_DEVICE);
 164         dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
 165         spin_lock_irqsave(&priv->page_lock, flags);
 166         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
 167         if (tx == NUM_TX_DESC - 1)
 168                 tx_next = 0;
 169         else
 170                 tx_next = tx + 1;
 171
 172         if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
 173             !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
 174             !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
 175                 goto out;
 176
 177         priv->tx[tx].txd1 = mapped_addr;
 178         priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
 179         priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
 180         dev->stats.tx_packets++;
 181         dev->stats.tx_bytes += skb->len;
 182         priv->tx_skb[tx] = skb;
 183         wmb();
 184         ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 185         spin_unlock_irqrestore(&priv->page_lock, flags);
 186         return NETDEV_TX_OK;
 187
 188  out:
 189         spin_unlock_irqrestore(&priv->page_lock, flags);
 190         dev->stats.tx_dropped++;
 191         kfree_skb(skb);
 192         return NETDEV_TX_OK;
 193 }
 194
 195 static void
 196 ramips_eth_rx_hw(unsigned long ptr)
 197 {
 198         struct net_device *dev = (struct net_device *) ptr;
 199         struct raeth_priv *priv = netdev_priv(dev);
 200         int rx;
 201         int max_rx = 16;
 202
 203         while (max_rx) {
 204                 struct sk_buff *rx_skb, *new_skb;
 205
 206                 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
 207                 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
 208                         break;
 209                 max_rx--;
 210
 211                 rx_skb = priv->rx_skb[rx];
 212                 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
 213                 rx_skb->dev = dev;
 214                 rx_skb->protocol = eth_type_trans(rx_skb, dev);
 215                 rx_skb->ip_summed = CHECKSUM_NONE;
 216                 dev->stats.rx_packets++;
 217                 dev->stats.rx_bytes += rx_skb->len;
 218                 netif_rx(rx_skb);
 219
 220                 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
 221                 priv->rx_skb[rx] = new_skb;
 222                 BUG_ON(!new_skb);
 223                 skb_reserve(new_skb, 2);
 224                 priv->rx[rx].rxd1 = dma_map_single(NULL,
 225                                                    new_skb->data,
 226                                                    MAX_RX_LENGTH + 2,
 227                                                    DMA_FROM_DEVICE);
 228                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
 229                 wmb();
 230                 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
 231         }
 232
 233         if (max_rx == 0)
 234                 tasklet_schedule(&priv->rx_tasklet);
 235         else
 236                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
 237                              RAMIPS_FE_INT_ENABLE);
 238 }
 239
 240 static void
 241 ramips_eth_tx_housekeeping(unsigned long ptr)
 242 {
 243         struct net_device *dev = (struct net_device*)ptr;
 244         struct raeth_priv *priv = netdev_priv(dev);
 245
 246         while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
 247                (priv->tx_skb[priv->skb_free_idx])) {
 248                 dev_kfree_skb_irq((struct sk_buff *) priv->tx_skb[priv->skb_free_idx]);
 249                 priv->tx_skb[priv->skb_free_idx] = 0;
 250                 priv->skb_free_idx++;
 251                 if (priv->skb_free_idx >= NUM_TX_DESC)
 252                         priv->skb_free_idx = 0;
 253         }
 254
 255         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
 256                      RAMIPS_FE_INT_ENABLE);
 257 }
 258
 259 static int
 260 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
 261 {
 262         unsigned char *mac = (unsigned char *) priv;
 263
 264         if (netif_running(dev))
 265                 return -EBUSY;
 266
 267         memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
 268         ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
 269         ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
 270                      RAMIPS_GDMA1_MAC_ADRL);
 271         return 0;
 272 }
 273
 274 static void
 275 ramips_eth_timeout(struct net_device *dev)
 276 {
 277         struct raeth_priv *priv = netdev_priv(dev);
 278
 279         tasklet_schedule(&priv->tx_housekeeping_tasklet);
 280 }
 281
 282 static irqreturn_t
 283 ramips_eth_irq(int irq, void *dev)
 284 {
 285         struct raeth_priv *priv = netdev_priv(dev);
 286         unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
 287
 288         ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
 289
 290         if (fe_int & RAMIPS_RX_DLY_INT) {
 291                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
 292                              RAMIPS_FE_INT_ENABLE);
 293                 tasklet_schedule(&priv->rx_tasklet);
 294         }
 295
 296         if (fe_int & RAMIPS_TX_DLY_INT)
 297                 ramips_eth_tx_housekeeping((unsigned long)dev);
 298
 299         return IRQ_HANDLED;
 300 }
 301
 302 static int
 303 ramips_eth_open(struct net_device *dev)
 304 {
 305         struct raeth_priv *priv = netdev_priv(dev);
 306         int err;
 307
 308         err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
 309                           dev->name, dev);
 310         if (err)
 311                 return err;
 312
 313         err = ramips_alloc_dma(priv);
 314         if (err)
 315                 goto err_free_irq;
 316
 317         ramips_setup_dma(priv);
 318         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 319                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 320                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
 321                 RAMIPS_PDMA_GLO_CFG);
 322         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
 323                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
 324                 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
 325                 RAMIPS_FE_GLO_CFG);
 326
 327         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
 328                      (unsigned long)dev);
 329         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
 330
 331         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
 332         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
 333         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
 334                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
 335                 RAMIPS_GDMA1_FWD_CFG);
 336         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
 337                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
 338                 RAMIPS_CDMA_CSG_CFG);
 339         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
 340         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
 341         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
 342
 343         netif_start_queue(dev);
 344         return 0;
 345
 346  err_free_irq:
 347         free_irq(dev->irq, dev);
 348         return err;
 349 }
 350
 351 static int
 352 ramips_eth_stop(struct net_device *dev)
 353 {
 354         struct raeth_priv *priv = netdev_priv(dev);
 355
 356         ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
 357                      ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
 358                      RAMIPS_PDMA_GLO_CFG);
 359         free_irq(dev->irq, dev);
 360         netif_stop_queue(dev);
 361         tasklet_kill(&priv->tx_housekeeping_tasklet);
 362         tasklet_kill(&priv->rx_tasklet);
 363         ramips_cleanup_dma(priv);
 364         printk(KERN_DEBUG "ramips_eth: stopped\n");
 365         return 0;
 366 }
 367
 368 static int __init
 369 ramips_eth_probe(struct net_device *dev)
 370 {
 371         struct raeth_priv *priv = netdev_priv(dev);
 372         struct sockaddr addr;
 373
 374         BUG_ON(!priv->plat->reset_fe);
 375         priv->plat->reset_fe();
 376         net_srandom(jiffies);
 377         memcpy(addr.sa_data, priv->plat->mac, 6);
 378         ramips_eth_set_mac_addr(dev, &addr);
 379
 380         ether_setup(dev);
 381         dev->mtu = 1500;
 382         dev->watchdog_timeo = TX_TIMEOUT;
 383         spin_lock_init(&priv->page_lock);
 384
 385         return 0;
 386 }
 387
 388 static const struct net_device_ops ramips_eth_netdev_ops = {
 389         .ndo_init               = ramips_eth_probe,
 390         .ndo_open               = ramips_eth_open,
 391         .ndo_stop               = ramips_eth_stop,
 392         .ndo_start_xmit         = ramips_eth_hard_start_xmit,
 393         .ndo_tx_timeout         = ramips_eth_timeout,
 394         .ndo_change_mtu         = eth_change_mtu,
 395         .ndo_set_mac_address    = ramips_eth_set_mac_addr,
 396         .ndo_validate_addr      = eth_validate_addr,
 397 };
 398
 399 static int
 400 ramips_eth_plat_probe(struct platform_device *plat)
 401 {
 402         struct raeth_priv *priv;
 403         struct ramips_eth_platform_data *data = plat->dev.platform_data;
 404         struct resource *res;
 405         int err;
 406
 407         if (!data) {
 408                 dev_err(&plat->dev, "no platform data specified\n");
 409                 return -EINVAL;
 410         }
 411
 412         res = platform_get_resource(plat, IORESOURCE_MEM, 0);
 413         if (!res) {
 414                 dev_err(&plat->dev, "no memory resource found\n");
 415                 return -ENXIO;
 416         }
 417
 418         ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
 419         if (!ramips_fe_base)
 420                 return -ENOMEM;
 421
 422         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
 423         if (!ramips_dev) {
 424                 dev_err(&plat->dev, "alloc_etherdev failed\n");
 425                 err = -ENOMEM;
 426                 goto err_unmap;
 427         }
 428
 429         strcpy(ramips_dev->name, "eth%d");
 430         ramips_dev->irq = platform_get_irq(plat, 0);
 431         if (ramips_dev->irq < 0) {
 432                 dev_err(&plat->dev, "no IRQ resource found\n");
 433                 err = -ENXIO;
 434                 goto err_free_dev;
 435         }
 436         ramips_dev->addr_len = ETH_ALEN;
 437         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
 438         ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
 439
 440         priv = netdev_priv(ramips_dev);
 441         priv->plat = data;
 442
 443         err = register_netdev(ramips_dev);
 444         if (err) {
 445                 dev_err(&plat->dev, "error bringing up device\n");
 446                 goto err_free_dev;
 447         }
 448
 449 #ifdef CONFIG_RALINK_RT305X
 450         rt305x_esw_init();
 451 #endif
 452         printk(KERN_DEBUG "ramips_eth: loaded\n");
 453         return 0;
 454
 455  err_free_dev:
 456         kfree(ramips_dev);
 457  err_unmap:
 458         iounmap(ramips_fe_base);
 459         return err;
 460 }
 461
 462 static int
 463 ramips_eth_plat_remove(struct platform_device *plat)
 464 {
 465         unregister_netdev(ramips_dev);
 466         free_netdev(ramips_dev);
 467         printk(KERN_DEBUG "ramips_eth: unloaded\n");
 468         return 0;
 469 }
 470
 471 static struct platform_driver ramips_eth_driver = {
 472         .probe = ramips_eth_plat_probe,
 473         .remove = ramips_eth_plat_remove,
 474         .driver = {
 475                 .name = "ramips_eth",
 476                 .owner = THIS_MODULE,
 477         },
 478 };
 479
 480 static int __init
 481 ramips_eth_init(void)
 482 {
 483         int ret = platform_driver_register(&ramips_eth_driver);
 484         if (ret)
 485                 printk(KERN_ERR
 486                        "ramips_eth: Error registering platfom driver!\n");
 487         return ret;
 488 }
 489
 490 static void __exit
 491 ramips_eth_cleanup(void)
 492 {
 493         platform_driver_unregister(&ramips_eth_driver);
 494 }
 495
 496 module_init(ramips_eth_init);
 497 module_exit(ramips_eth_cleanup);
 498
 499 MODULE_LICENSE("GPL");
 500 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 501 MODULE_DESCRIPTION("ethernet driver for ramips boards");