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