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; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  *   Copyright (C) 2009 John Crispin <blogic@openwrt.org>
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/version.h>
  21 #include <linux/kernel.h>
  22 #include <linux/types.h>
  23 #include <linux/pci.h>
  24 #include <linux/init.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/if_vlan.h>
  27 #include <linux/if_ether.h>
  28 #include <linux/platform_device.h>
  29 #include <asm/uaccess.h>
  30 #include <net/sock.h>
  31 #include <asm/uaccess.h>
  32
  33 #include <eth.h>
  34
  35 #define TX_TIMEOUT (20 * HZ / 100)
  36 #define MAX_RX_LENGTH   1500
  37
  38 #ifdef CONFIG_RALINK_RT305X
  39 #include "ramips_esw.c"
  40 #endif
  41
  42 #define phys_to_bus(a)  (a & 0x1FFFFFFF)
  43
  44 static struct net_device * ramips_dev;
  45 static void __iomem *ramips_fe_base = 0;
  46
  47 static inline void
  48 ramips_fe_wr(u32 val, unsigned reg)
  49 {
  50         __raw_writel(val, ramips_fe_base + reg);
  51 }
  52
  53 static inline u32
  54 ramips_fe_rr(unsigned reg)
  55 {
  56         return __raw_readl(ramips_fe_base + reg);
  57 }
  58
  59 static int
  60 ramips_alloc_dma(struct net_device *dev)
  61 {
  62         struct raeth_priv *priv = netdev_priv(dev);
  63         int i;
  64
  65         priv->skb_free_idx = 0;
  66
  67         /* setup tx ring */
  68         priv->tx = dma_alloc_coherent(NULL,
  69                 NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
  70         for(i = 0; i < NUM_TX_DESC; i++)
  71         {
  72                 memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
  73                 priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
  74                 priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
  75                 priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
  76         }
  77         ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
  78         ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
  79         ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
  80         ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
  81
  82         /* setup rx ring */
  83         priv->rx = dma_alloc_coherent(NULL,
  84                 NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
  85         memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
  86         for(i = 0; i < NUM_RX_DESC; i++)
  87         {
  88                 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
  89                 BUG_ON(!new_skb);
  90                 skb_reserve(new_skb, 2);
  91                 priv->rx[i].rxd1 =
  92                         dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
  93                                 PCI_DMA_FROMDEVICE);
  94                 priv->rx[i].rxd2 |= RX_DMA_LSO;
  95                 priv->rx_skb[i] = new_skb;
  96         }
  97         ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
  98         ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
  99         ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
 100         ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
 101
 102         return 0;
 103 }
 104
 105 static int
 106 ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
 107 {
 108         struct raeth_priv *priv = netdev_priv(dev);
 109         unsigned long tx;
 110         unsigned int tx_next;
 111         unsigned int mapped_addr;
 112         if(priv->plat->min_pkt_len)
 113         {
 114                 if(skb->len < priv->plat->min_pkt_len)
 115                  {
 116                      if(skb_padto(skb, priv->plat->min_pkt_len))
 117                          {
 118                                  printk(KERN_ERR "ramips_eth: skb_padto failed\n");
 119                                  kfree_skb(skb);
 120                                  return 0;
 121                          }
 122                      skb_put(skb, priv->plat->min_pkt_len - skb->len);
 123                  }
 124         }
 125         dev->trans_start = jiffies;
 126         mapped_addr = (unsigned int)dma_map_single(NULL, skb->data, skb->len,
 127                         PCI_DMA_TODEVICE);
 128         dma_sync_single_for_device(NULL, mapped_addr, skb->len, PCI_DMA_TODEVICE);
 129         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
 130         if(tx == NUM_TX_DESC - 1)
 131                 tx_next = 0;
 132         else
 133                 tx_next = tx + 1;
 134         if((priv->tx_skb[tx]== 0) && (priv->tx_skb[tx_next] == 0))
 135         {
 136                 if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
 137                 {
 138                         kfree_skb(skb);
 139                         dev->stats.tx_dropped++;
 140                         printk(KERN_ERR "%s: dropping\n", dev->name);
 141                         return 0;
 142                 }
 143                 priv->tx[tx].txd1 = virt_to_phys(skb->data);
 144                 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
 145                 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
 146                 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 147                 dev->stats.tx_packets++;
 148                 dev->stats.tx_bytes += skb->len;
 149                 priv->tx_skb[tx] = skb;
 150                 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 151         } else {
 152                 dev->stats.tx_dropped++;
 153                 kfree_skb(skb);
 154         }
 155         return 0;
 156 }
 157
 158 static void
 159 ramips_eth_rx_hw(unsigned long ptr)
 160 {
 161         struct net_device *dev = (struct net_device*)ptr;
 162         struct raeth_priv *priv = netdev_priv(dev);
 163         int rx;
 164         int max_rx = 16;
 165
 166         while(max_rx)
 167         {
 168                 struct sk_buff *rx_skb, *new_skb;
 169
 170                 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
 171                 if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
 172                         break;
 173                 max_rx--;
 174
 175                 rx_skb = priv->rx_skb[rx];
 176                 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
 177                 rx_skb->tail = rx_skb->data + rx_skb->len;
 178                 rx_skb->dev = dev;
 179                 rx_skb->protocol = eth_type_trans(rx_skb, dev);
 180                 rx_skb->ip_summed = CHECKSUM_NONE;
 181                 dev->stats.rx_packets++;
 182                 dev->stats.rx_bytes += rx_skb->len;
 183                 netif_rx(rx_skb);
 184
 185                 new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
 186                 priv->rx_skb[rx] = new_skb;
 187                 BUG_ON(!new_skb);
 188                 skb_reserve(new_skb, 2);
 189                 priv->rx[rx].rxd1 =
 190                         dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
 191                         PCI_DMA_FROMDEVICE);
 192                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
 193                 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
 194         }
 195         if(max_rx == 0)
 196                 tasklet_schedule(&priv->rx_tasklet);
 197         else
 198                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
 199                         RAMIPS_FE_INT_ENABLE);
 200 }
 201
 202 static void
 203 ramips_eth_tx_housekeeping(unsigned long ptr)
 204 {
 205         struct net_device *dev = (struct net_device*)ptr;
 206         struct raeth_priv *priv = netdev_priv(dev);
 207
 208         while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
 209                 (priv->tx_skb[priv->skb_free_idx]))
 210         {
 211                 dev_kfree_skb_irq((struct sk_buff*)priv->tx_skb[priv->skb_free_idx]);
 212                 priv->tx_skb[priv->skb_free_idx] = 0;
 213                 priv->skb_free_idx++;
 214                 if(priv->skb_free_idx >= NUM_TX_DESC)
 215                         priv->skb_free_idx = 0;
 216         }
 217         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
 218                 RAMIPS_FE_INT_ENABLE);
 219 }
 220
 221 static int
 222 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
 223 {
 224         unsigned char *mac = (unsigned char*)priv;
 225
 226         if(netif_running(dev))
 227                 return -EBUSY;
 228         memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
 229         ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
 230         ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
 231                 (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
 232         return 0;
 233 }
 234
 235 static void
 236 ramips_eth_timeout(struct net_device *dev)
 237 {
 238         struct raeth_priv *priv = netdev_priv(dev);
 239
 240         tasklet_schedule(&priv->tx_housekeeping_tasklet);
 241 }
 242
 243 static irqreturn_t
 244 ramips_eth_irq(int irq, void *dev)
 245 {
 246         struct raeth_priv *priv = netdev_priv(dev);
 247         unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
 248
 249         ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
 250
 251         if(fe_int & RAMIPS_RX_DLY_INT)
 252         {
 253                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
 254                         RAMIPS_FE_INT_ENABLE);
 255                 tasklet_schedule(&priv->rx_tasklet);
 256         }
 257         if(fe_int & RAMIPS_TX_DLY_INT)
 258                 ramips_eth_tx_housekeeping((unsigned long)dev);
 259         return IRQ_HANDLED;
 260 }
 261
 262 static int
 263 ramips_eth_open(struct net_device *dev)
 264 {
 265         struct raeth_priv *priv = netdev_priv(dev);
 266
 267         ramips_alloc_dma(dev);
 268         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 269                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 270                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
 271                 RAMIPS_PDMA_GLO_CFG);
 272         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
 273                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
 274                 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
 275                 RAMIPS_FE_GLO_CFG);
 276         request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED, dev->name, dev);
 277         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
 278                 (unsigned long)dev);
 279         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
 280         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
 281         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
 282         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
 283                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
 284                 RAMIPS_GDMA1_FWD_CFG);
 285         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
 286                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
 287                 RAMIPS_CDMA_CSG_CFG);
 288         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
 289         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
 290         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
 291         netif_start_queue(dev);
 292         return 0;
 293 }
 294
 295 static int
 296 ramips_eth_stop(struct net_device *dev)
 297 {
 298         struct raeth_priv *priv = netdev_priv(dev);
 299
 300         ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
 301                 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
 302         free_irq(dev->irq, dev);
 303         netif_stop_queue(dev);
 304         tasklet_kill(&priv->tx_housekeeping_tasklet);
 305         tasklet_kill(&priv->rx_tasklet);
 306         pci_free_consistent(NULL, NUM_TX_DESC * sizeof(struct ramips_tx_dma),
 307                 priv->tx, priv->phy_tx);
 308         pci_free_consistent(NULL, NUM_RX_DESC * sizeof(struct ramips_rx_dma),
 309                 priv->rx, priv->phy_rx);
 310         printk(KERN_DEBUG "ramips_eth: stopped\n");
 311         return 0;
 312 }
 313
 314 static int __init
 315 ramips_eth_probe(struct net_device *dev)
 316 {
 317         struct raeth_priv *priv = netdev_priv(dev);
 318         struct sockaddr addr;
 319
 320         BUG_ON(!priv->plat->reset_fe);
 321         priv->plat->reset_fe();
 322         net_srandom(jiffies);
 323         memcpy(addr.sa_data, priv->plat->mac, 6);
 324         ramips_eth_set_mac_addr(dev, &addr);
 325
 326         ether_setup(dev);
 327         dev->open = ramips_eth_open;
 328         dev->stop = ramips_eth_stop;
 329         dev->hard_start_xmit = ramips_eth_hard_start_xmit;
 330         dev->set_mac_address = ramips_eth_set_mac_addr;
 331         dev->mtu = MAX_RX_LENGTH;
 332         dev->tx_timeout = ramips_eth_timeout;
 333         dev->watchdog_timeo = TX_TIMEOUT;
 334         return 0;
 335 }
 336
 337 static int
 338 ramips_eth_plat_probe(struct platform_device *plat)
 339 {
 340         struct raeth_priv *priv;
 341         struct ramips_eth_platform_data *data = plat->dev.platform_data;
 342         ramips_fe_base = ioremap_nocache(data->base_addr, PAGE_SIZE);
 343         if(!ramips_fe_base)
 344                 return -ENOMEM;
 345         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
 346         if(!ramips_dev)
 347                 return -ENOMEM;
 348         strcpy(ramips_dev->name, "eth%d");
 349         ramips_dev->irq = data->irq;
 350         ramips_dev->addr_len = ETH_ALEN;
 351         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
 352         ramips_dev->init = ramips_eth_probe;
 353         priv = (struct raeth_priv*)netdev_priv(ramips_dev);
 354         priv->plat = data;
 355         if(register_netdev(ramips_dev))
 356         {
 357                 printk(KERN_ERR "ramips_eth: error bringing up device\n");
 358                 return -ENXIO;
 359         }
 360 #ifdef CONFIG_RALINK_RT305X
 361         rt305x_esw_init();
 362 #endif
 363         printk(KERN_DEBUG "ramips_eth: loaded\n");
 364         return 0;
 365 }
 366
 367 static int
 368 ramips_eth_plat_remove(struct platform_device *plat)
 369 {
 370         unregister_netdev(ramips_dev);
 371         free_netdev(ramips_dev);
 372         printk(KERN_DEBUG "ramips_eth: unloaded\n");
 373         return 0;
 374 }
 375
 376 static struct platform_driver ramips_eth_driver = {
 377         .probe = ramips_eth_plat_probe,
 378         .remove = ramips_eth_plat_remove,
 379         .driver = {
 380                 .name = "ramips_eth",
 381                 .owner = THIS_MODULE,
 382         },
 383 };
 384
 385 static int __init
 386 ramips_eth_init(void)
 387 {
 388         int ret = platform_driver_register(&ramips_eth_driver);
 389         if (ret)
 390                 printk(KERN_ERR
 391                        "ramips_eth: Error registering platfom driver!\n");
 392         return ret;
 393 }
 394
 395 static void __exit
 396 ramips_eth_cleanup(void)
 397 {
 398         platform_driver_unregister(&ramips_eth_driver);
 399 }
 400
 401 module_init(ramips_eth_init);
 402 module_exit(ramips_eth_cleanup);
 403
 404 MODULE_LICENSE("GPL");
 405 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 406 MODULE_DESCRIPTION("ethernet driver for ramips boards");