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