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