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 <asm/uaccess.h>
  29 #include <net/sock.h>
  30 #include <asm/uaccess.h>
  31
  32 #include <rt305x.h>
  33 #include <rt305x_regs.h>
  34 #include <eth.h>
  35
  36 #define TX_TIMEOUT (20 * HZ / 100)
  37 #define MAX_RX_LENGTH   1500
  38
  39 #ifdef CONFIG_RALINK_RT305X
  40 #include "ramips_esw.c"
  41 #endif
  42
  43 static struct net_device * ramips_dev;
  44 static void __iomem *ramips_fe_base = 0;
  45
  46 static inline void
  47 ramips_fe_wr(u32 val, unsigned reg)
  48 {
  49         __raw_writel(val, ramips_fe_base + reg);
  50 }
  51
  52 static inline u32
  53 ramips_fe_rr(unsigned reg)
  54 {
  55         return __raw_readl(ramips_fe_base + reg);
  56 }
  57
  58 static int
  59 ramips_alloc_dma(struct net_device *dev)
  60 {
  61 #define phys_to_bus(a)  (a & 0x1FFFFFFF)
  62         struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
  63         int i;
  64
  65         priv->skb_free_idx = 0;
  66
  67         /* setup tx ring */
  68         priv->tx = pci_alloc_consistent(NULL,
  69                 NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx);
  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 = pci_alloc_consistent(NULL,
  84                 NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx);
  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[i].rxd3 = (unsigned int)new_skb;
  96         }
  97         dma_cache_wback_inv((unsigned long)priv->rx,
  98                 NUM_RX_DESC * (sizeof(struct ramips_rx_dma)));
  99
 100         ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
 101         ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
 102         ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
 103         ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
 104
 105         return 0;
 106 }
 107
 108 static int
 109 ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
 110 {
 111         struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
 112         unsigned long tx;
 113         unsigned int tx_next;
 114
 115 #ifdef CONFIG_RALINK_RT305X
 116 #define MIN_PKT_LEN  64
 117          if(skb->len < MIN_PKT_LEN)
 118          {
 119              if(skb_padto(skb, MIN_PKT_LEN))
 120                  {
 121                          printk(KERN_ERR "ramips_eth: skb_padto failed\n");
 122                          kfree_skb(skb);
 123                          return 0;
 124              }
 125              skb_put(skb, MIN_PKT_LEN - skb->len);
 126          }
 127 #endif
 128         dev->trans_start = jiffies;
 129         dma_cache_wback_inv((unsigned long)skb->data, skb->len);
 130         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
 131         if(tx == NUM_TX_DESC - 1)
 132                 tx_next = 0;
 133         else
 134                 tx_next = tx + 1;
 135         if((priv->tx[tx].txd3 == 0) && (priv->tx[tx_next].txd3 == 0))
 136         {
 137                 if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
 138                 {
 139                         kfree_skb(skb);
 140                         priv->stat.tx_dropped++;
 141                         printk(KERN_ERR "%s: dropping\n", dev->name);
 142                         return 0;
 143                 }
 144                 priv->tx[tx].txd1 = virt_to_phys(skb->data);
 145                 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
 146                 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
 147                 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 148                 priv->stat.tx_packets++;
 149                 priv->stat.tx_bytes += skb->len;
 150                 priv->tx[tx].txd3 = (unsigned int)skb;
 151                 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 152         } else {
 153                 priv->stat.tx_dropped++;
 154                 kfree_skb(skb);
 155         }
 156         return 0;
 157 }
 158
 159 static void
 160 ramips_eth_rx_hw(unsigned long ptr)
 161 {
 162         struct net_device *dev = (struct net_device*)ptr;
 163         struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
 164         int rx;
 165         int max_rx = 16;
 166
 167         while(max_rx)
 168         {
 169                 struct sk_buff *rx_skb, *new_skb;
 170
 171                 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
 172                 if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
 173                         break;
 174                 max_rx--;
 175
 176                 rx_skb = (struct sk_buff*)priv->rx[rx].rxd3;
 177                 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
 178                 rx_skb->tail = rx_skb->data + rx_skb->len;
 179                 rx_skb->dev = dev;
 180                 rx_skb->protocol = eth_type_trans(rx_skb, dev);
 181                 rx_skb->ip_summed = CHECKSUM_NONE;
 182                 priv->stat.rx_packets++;
 183                 priv->stat.rx_bytes += rx_skb->len;
 184                 netif_rx(rx_skb);
 185
 186                 new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
 187                 priv->rx[rx].rxd3 = (unsigned int)new_skb;
 188                 BUG_ON(!new_skb);
 189                 skb_reserve(new_skb, 2);
 190                 priv->rx[rx].rxd1 =
 191                         dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
 192                         PCI_DMA_FROMDEVICE);
 193                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
 194                 dma_cache_wback_inv((unsigned long)&priv->rx[rx],
 195                         sizeof(struct ramips_rx_dma));
 196                 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
 197         }
 198         if(max_rx == 0)
 199                 tasklet_schedule(&priv->rx_tasklet);
 200         else
 201                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
 202                         RAMIPS_FE_INT_ENABLE);
 203 }
 204
 205 static void
 206 ramips_eth_tx_housekeeping(unsigned long ptr)
 207 {
 208         struct net_device *dev = (struct net_device*)ptr;
 209         struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
 210
 211         while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
 212                 (priv->tx[priv->skb_free_idx].txd3))
 213         {
 214                 dev_kfree_skb_irq((struct sk_buff*)priv->tx[priv->skb_free_idx].txd3);
 215                 priv->tx[priv->skb_free_idx].txd3 = 0;
 216                 priv->skb_free_idx++;
 217                 if(priv->skb_free_idx >= NUM_TX_DESC)
 218                         priv->skb_free_idx = 0;
 219         }
 220         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
 221                 RAMIPS_FE_INT_ENABLE);
 222 }
 223
 224 static struct net_device_stats*
 225 ramips_eth_get_stats(struct net_device *dev)
 226 {
 227         return &((struct raeth_priv*)netdev_priv(dev))->stat;
 228 }
 229
 230 static int
 231 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
 232 {
 233         unsigned char *mac = (unsigned char*)priv;
 234
 235         if(netif_running(dev))
 236                 return -EBUSY;
 237         memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
 238         ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
 239         ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
 240                 (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
 241         return 0;
 242 }
 243
 244 static void
 245 ramips_eth_timeout(struct net_device *dev)
 246 {
 247         tasklet_schedule(
 248                 &((struct raeth_priv*)netdev_priv(dev))->tx_housekeeping_tasklet);
 249 }
 250
 251 static irqreturn_t
 252 ramips_eth_irq(int irq, void *dev)
 253 {
 254         struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
 255         unsigned long fe_int = ramips_fe_rr(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                 tasklet_schedule(&priv->tx_housekeeping_tasklet);
 265         ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
 266         return IRQ_HANDLED;
 267 }
 268
 269 static int
 270 ramips_eth_open(struct net_device *dev)
 271 {
 272         struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
 273
 274         ramips_alloc_dma(dev);
 275         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 276                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 277                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
 278                 RAMIPS_PDMA_GLO_CFG);
 279         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
 280                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
 281                 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
 282                 RAMIPS_FE_GLO_CFG);
 283         request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED, dev->name, dev);
 284         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
 285                 (unsigned long)dev);
 286         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
 287         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
 288         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
 289         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
 290                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
 291                 RAMIPS_GDMA1_FWD_CFG);
 292         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
 293                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
 294                 RAMIPS_CDMA_CSG_CFG);
 295         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
 296         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
 297         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
 298         netif_start_queue(dev);
 299         return 0;
 300 }
 301
 302 static int
 303 ramips_eth_stop(struct net_device *dev)
 304 {
 305         struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
 306
 307         ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
 308                 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
 309         free_irq(dev->irq, dev);
 310         netif_stop_queue(dev);
 311         tasklet_kill(&priv->tx_housekeeping_tasklet);
 312         tasklet_kill(&priv->rx_tasklet);
 313         pci_free_consistent(NULL, NUM_TX_DESC * sizeof(struct ramips_tx_dma),
 314                 priv->tx, priv->phy_tx);
 315         pci_free_consistent(NULL, NUM_RX_DESC * sizeof(struct ramips_rx_dma),
 316                 priv->rx, priv->phy_rx);
 317         printk(KERN_INFO "ramips_eth: stopped\n");
 318         return 0;
 319 }
 320
 321 int __init
 322 ramips_eth_probe(struct net_device *dev)
 323 {
 324         struct sockaddr addr;
 325         unsigned char mac_addr01234[5] = {0x00, 0x0C, 0x43, 0x28, 0x80};
 326
 327         /* reset frame engine */
 328         rt305x_sysc_wr(RAMIPS_FE_RESET_BIT, RAMIPS_FE_RESET);
 329         rt305x_sysc_wr(0, RAMIPS_FE_RESET);
 330
 331         net_srandom(jiffies);
 332         memcpy(addr.sa_data, mac_addr01234, 5);
 333         addr.sa_data[5] = net_random()&0xFF;
 334         ramips_eth_set_mac_addr(dev, &addr);
 335
 336         ether_setup(dev);
 337         dev->open = ramips_eth_open;
 338         dev->stop = ramips_eth_stop;
 339         dev->hard_start_xmit = ramips_eth_hard_start_xmit;
 340         dev->get_stats = ramips_eth_get_stats;
 341         dev->set_mac_address = ramips_eth_set_mac_addr;
 342         dev->mtu = MAX_RX_LENGTH;
 343         dev->tx_timeout = ramips_eth_timeout;
 344         dev->watchdog_timeo = TX_TIMEOUT;
 345         return 0;
 346 }
 347
 348 int __init
 349 ramips_eth_init(void)
 350 {
 351         ramips_fe_base = ioremap_nocache(RT305X_FE_BASE, PAGE_SIZE);
 352         if(!ramips_fe_base)
 353                 return -ENOMEM;
 354         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
 355         if(!ramips_dev)
 356                 return -ENOMEM;
 357         strcpy(ramips_dev->name, "eth%d");
 358         ramips_dev->irq = RT305X_CPU_IRQ_FE;
 359         ramips_dev->addr_len = ETH_ALEN;
 360         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
 361         ramips_dev->init = ramips_eth_probe;
 362         if(register_netdev(ramips_dev))
 363         {
 364                 printk(KERN_ERR "ramips_eth: error bringing up device\n");
 365                 return -ENXIO;
 366         }
 367 #ifdef CONFIG_RALINK_RT305X
 368         rt305x_esw_init();
 369 #endif
 370         printk(KERN_INFO "ramips_eth: loaded\n");
 371         return 0;
 372 }
 373
 374 void
 375 ramips_eth_cleanup(void)
 376 {
 377         unregister_netdev(ramips_dev);
 378         free_netdev(ramips_dev);
 379         printk(KERN_INFO "ramips_eth: unloaded");
 380 }
 381
 382 module_init(ramips_eth_init);
 383 module_exit(ramips_eth_cleanup);
 384
 385 MODULE_LICENSE("GPL");
 386 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 387 MODULE_DESCRIPTION("ethernet driver for ramips boards");