release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/fs_enet/mac-fec.c

   1 /*
   2  * Freescale Ethernet controllers
   3  *
   4  * Copyright (c) 2005 Intracom S.A.
   5  *  by Pantelis Antoniou <panto@intracom.gr>
   6  *
   7  * 2005 (c) MontaVista Software, Inc.
   8  * Vitaly Bordug <vbordug@ru.mvista.com>
   9  *
  10  * This file is licensed under the terms of the GNU General Public License
  11  * version 2. This program is licensed "as is" without any warranty of any
  12  * kind, whether express or implied.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/types.h>
  18 #include <linux/string.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/errno.h>
  21 #include <linux/ioport.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/init.h>
  24 #include <linux/delay.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/mii.h>
  30 #include <linux/ethtool.h>
  31 #include <linux/bitops.h>
  32 #include <linux/fs.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/of_device.h>
  35 #include <linux/gfp.h>
  36
  37 #include <asm/irq.h>
  38 #include <asm/uaccess.h>
  39
  40 #ifdef CONFIG_8xx
  41 #include <asm/8xx_immap.h>
  42 #include <asm/pgtable.h>
  43 #include <asm/mpc8xx.h>
  44 #include <asm/cpm1.h>
  45 #endif
  46
  47 #include "fs_enet.h"
  48 #include "fec.h"
  49
  50 /*************************************************/
  51
  52 #if defined(CONFIG_CPM1)
  53 /* for a CPM1 __raw_xxx's are sufficient */
  54 #define __fs_out32(addr, x)     __raw_writel(x, addr)
  55 #define __fs_out16(addr, x)     __raw_writew(x, addr)
  56 #define __fs_in32(addr) __raw_readl(addr)
  57 #define __fs_in16(addr) __raw_readw(addr)
  58 #else
  59 /* for others play it safe */
  60 #define __fs_out32(addr, x)     out_be32(addr, x)
  61 #define __fs_out16(addr, x)     out_be16(addr, x)
  62 #define __fs_in32(addr) in_be32(addr)
  63 #define __fs_in16(addr) in_be16(addr)
  64 #endif
  65
  66 /* write */
  67 #define FW(_fecp, _reg, _v) __fs_out32(&(_fecp)->fec_ ## _reg, (_v))
  68
  69 /* read */
  70 #define FR(_fecp, _reg) __fs_in32(&(_fecp)->fec_ ## _reg)
  71
  72 /* set bits */
  73 #define FS(_fecp, _reg, _v) FW(_fecp, _reg, FR(_fecp, _reg) | (_v))
  74
  75 /* clear bits */
  76 #define FC(_fecp, _reg, _v) FW(_fecp, _reg, FR(_fecp, _reg) & ~(_v))
  77
  78 /*
  79  * Delay to wait for FEC reset command to complete (in us)
  80  */
  81 #define FEC_RESET_DELAY         50
  82
  83 static int whack_reset(struct fec __iomem *fecp)
  84 {
  85         int i;
  86
  87         FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
  88         for (i = 0; i < FEC_RESET_DELAY; i++) {
  89                 if ((FR(fecp, ecntrl) & FEC_ECNTRL_RESET) == 0)
  90                         return 0;       /* OK */
  91                 udelay(1);
  92         }
  93
  94         return -1;
  95 }
  96
  97 static int do_pd_setup(struct fs_enet_private *fep)
  98 {
  99         struct platform_device *ofdev = to_platform_device(fep->dev);
 100
 101         fep->interrupt = of_irq_to_resource(ofdev->dev.of_node, 0, NULL);
 102         if (fep->interrupt == NO_IRQ)
 103                 return -EINVAL;
 104
 105         fep->fec.fecp = of_iomap(ofdev->dev.of_node, 0);
 106         if (!fep->fcc.fccp)
 107                 return -EINVAL;
 108
 109         return 0;
 110 }
 111
 112 #define FEC_NAPI_RX_EVENT_MSK   (FEC_ENET_RXF | FEC_ENET_RXB)
 113 #define FEC_RX_EVENT            (FEC_ENET_RXF)
 114 #define FEC_TX_EVENT            (FEC_ENET_TXF)
 115 #define FEC_ERR_EVENT_MSK       (FEC_ENET_HBERR | FEC_ENET_BABR | \
 116                                  FEC_ENET_BABT | FEC_ENET_EBERR)
 117
 118 static int setup_data(struct net_device *dev)
 119 {
 120         struct fs_enet_private *fep = netdev_priv(dev);
 121
 122         if (do_pd_setup(fep) != 0)
 123                 return -EINVAL;
 124
 125         fep->fec.hthi = 0;
 126         fep->fec.htlo = 0;
 127
 128         fep->ev_napi_rx = FEC_NAPI_RX_EVENT_MSK;
 129         fep->ev_rx = FEC_RX_EVENT;
 130         fep->ev_tx = FEC_TX_EVENT;
 131         fep->ev_err = FEC_ERR_EVENT_MSK;
 132
 133         return 0;
 134 }
 135
 136 static int allocate_bd(struct net_device *dev)
 137 {
 138         struct fs_enet_private *fep = netdev_priv(dev);
 139         const struct fs_platform_info *fpi = fep->fpi;
 140
 141         fep->ring_base = (void __force __iomem *)dma_alloc_coherent(fep->dev,
 142                                             (fpi->tx_ring + fpi->rx_ring) *
 143                                             sizeof(cbd_t), &fep->ring_mem_addr,
 144                                             GFP_KERNEL);
 145         if (fep->ring_base == NULL)
 146                 return -ENOMEM;
 147
 148         return 0;
 149 }
 150
 151 static void free_bd(struct net_device *dev)
 152 {
 153         struct fs_enet_private *fep = netdev_priv(dev);
 154         const struct fs_platform_info *fpi = fep->fpi;
 155
 156         if(fep->ring_base)
 157                 dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring)
 158                                         * sizeof(cbd_t),
 159                                         (void __force *)fep->ring_base,
 160                                         fep->ring_mem_addr);
 161 }
 162
 163 static void cleanup_data(struct net_device *dev)
 164 {
 165         /* nothing */
 166 }
 167
 168 static void set_promiscuous_mode(struct net_device *dev)
 169 {
 170         struct fs_enet_private *fep = netdev_priv(dev);
 171         struct fec __iomem *fecp = fep->fec.fecp;
 172
 173         FS(fecp, r_cntrl, FEC_RCNTRL_PROM);
 174 }
 175
 176 static void set_multicast_start(struct net_device *dev)
 177 {
 178         struct fs_enet_private *fep = netdev_priv(dev);
 179
 180         fep->fec.hthi = 0;
 181         fep->fec.htlo = 0;
 182 }
 183
 184 static void set_multicast_one(struct net_device *dev, const u8 *mac)
 185 {
 186         struct fs_enet_private *fep = netdev_priv(dev);
 187         int temp, hash_index, i, j;
 188         u32 crc, csrVal;
 189         u8 byte, msb;
 190
 191         crc = 0xffffffff;
 192         for (i = 0; i < 6; i++) {
 193                 byte = mac[i];
 194                 for (j = 0; j < 8; j++) {
 195                         msb = crc >> 31;
 196                         crc <<= 1;
 197                         if (msb ^ (byte & 0x1))
 198                                 crc ^= FEC_CRC_POLY;
 199                         byte >>= 1;
 200                 }
 201         }
 202
 203         temp = (crc & 0x3f) >> 1;
 204         hash_index = ((temp & 0x01) << 4) |
 205                      ((temp & 0x02) << 2) |
 206                      ((temp & 0x04)) |
 207                      ((temp & 0x08) >> 2) |
 208                      ((temp & 0x10) >> 4);
 209         csrVal = 1 << hash_index;
 210         if (crc & 1)
 211                 fep->fec.hthi |= csrVal;
 212         else
 213                 fep->fec.htlo |= csrVal;
 214 }
 215
 216 static void set_multicast_finish(struct net_device *dev)
 217 {
 218         struct fs_enet_private *fep = netdev_priv(dev);
 219         struct fec __iomem *fecp = fep->fec.fecp;
 220
 221         /* if all multi or too many multicasts; just enable all */
 222         if ((dev->flags & IFF_ALLMULTI) != 0 ||
 223             netdev_mc_count(dev) > FEC_MAX_MULTICAST_ADDRS) {
 224                 fep->fec.hthi = 0xffffffffU;
 225                 fep->fec.htlo = 0xffffffffU;
 226         }
 227
 228         FC(fecp, r_cntrl, FEC_RCNTRL_PROM);
 229         FW(fecp, hash_table_high, fep->fec.hthi);
 230         FW(fecp, hash_table_low, fep->fec.htlo);
 231 }
 232
 233 static void set_multicast_list(struct net_device *dev)
 234 {
 235         struct netdev_hw_addr *ha;
 236
 237         if ((dev->flags & IFF_PROMISC) == 0) {
 238                 set_multicast_start(dev);
 239                 netdev_for_each_mc_addr(ha, dev)
 240                         set_multicast_one(dev, ha->addr);
 241                 set_multicast_finish(dev);
 242         } else
 243                 set_promiscuous_mode(dev);
 244 }
 245
 246 static void restart(struct net_device *dev)
 247 {
 248         struct fs_enet_private *fep = netdev_priv(dev);
 249         struct fec __iomem *fecp = fep->fec.fecp;
 250         const struct fs_platform_info *fpi = fep->fpi;
 251         dma_addr_t rx_bd_base_phys, tx_bd_base_phys;
 252         int r;
 253         u32 addrhi, addrlo;
 254
 255         struct mii_bus* mii = fep->phydev->bus;
 256         struct fec_info* fec_inf = mii->priv;
 257
 258         r = whack_reset(fep->fec.fecp);
 259         if (r != 0)
 260                 dev_err(fep->dev, "FEC Reset FAILED!\n");
 261         /*
 262          * Set station address.
 263          */
 264         addrhi = ((u32) dev->dev_addr[0] << 24) |
 265                  ((u32) dev->dev_addr[1] << 16) |
 266                  ((u32) dev->dev_addr[2] <<  8) |
 267                   (u32) dev->dev_addr[3];
 268         addrlo = ((u32) dev->dev_addr[4] << 24) |
 269                  ((u32) dev->dev_addr[5] << 16);
 270         FW(fecp, addr_low, addrhi);
 271         FW(fecp, addr_high, addrlo);
 272
 273         /*
 274          * Reset all multicast.
 275          */
 276         FW(fecp, hash_table_high, fep->fec.hthi);
 277         FW(fecp, hash_table_low, fep->fec.htlo);
 278
 279         /*
 280          * Set maximum receive buffer size.
 281          */
 282         FW(fecp, r_buff_size, PKT_MAXBLR_SIZE);
 283 #ifdef CONFIG_FS_ENET_MPC5121_FEC
 284         FW(fecp, r_cntrl, PKT_MAXBUF_SIZE << 16);
 285 #else
 286         FW(fecp, r_hash, PKT_MAXBUF_SIZE);
 287 #endif
 288
 289         /* get physical address */
 290         rx_bd_base_phys = fep->ring_mem_addr;
 291         tx_bd_base_phys = rx_bd_base_phys + sizeof(cbd_t) * fpi->rx_ring;
 292
 293         /*
 294          * Set receive and transmit descriptor base.
 295          */
 296         FW(fecp, r_des_start, rx_bd_base_phys);
 297         FW(fecp, x_des_start, tx_bd_base_phys);
 298
 299         fs_init_bds(dev);
 300
 301         /*
 302          * Enable big endian and don't care about SDMA FC.
 303          */
 304 #ifdef CONFIG_FS_ENET_MPC5121_FEC
 305         FS(fecp, dma_control, 0xC0000000);
 306 #else
 307         FW(fecp, fun_code, 0x78000000);
 308 #endif
 309
 310         /*
 311          * Set MII speed.
 312          */
 313         FW(fecp, mii_speed, fec_inf->mii_speed);
 314
 315         /*
 316          * Clear any outstanding interrupt.
 317          */
 318         FW(fecp, ievent, 0xffc0);
 319 #ifndef CONFIG_FS_ENET_MPC5121_FEC
 320         FW(fecp, ivec, (virq_to_hw(fep->interrupt) / 2) << 29);
 321
 322         FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
 323 #else
 324         /*
 325          * Only set MII mode - do not touch maximum frame length
 326          * configured before.
 327          */
 328         FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE);
 329 #endif
 330         /*
 331          * adjust to duplex mode
 332          */
 333         if (fep->phydev->duplex) {
 334                 FC(fecp, r_cntrl, FEC_RCNTRL_DRT);
 335                 FS(fecp, x_cntrl, FEC_TCNTRL_FDEN);     /* FD enable */
 336         } else {
 337                 FS(fecp, r_cntrl, FEC_RCNTRL_DRT);
 338                 FC(fecp, x_cntrl, FEC_TCNTRL_FDEN);     /* FD disable */
 339         }
 340
 341         /*
 342          * Enable interrupts we wish to service.
 343          */
 344         FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB |
 345            FEC_ENET_RXF | FEC_ENET_RXB);
 346
 347         /*
 348          * And last, enable the transmit and receive processing.
 349          */
 350         FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
 351         FW(fecp, r_des_active, 0x01000000);
 352 }
 353
 354 static void stop(struct net_device *dev)
 355 {
 356         struct fs_enet_private *fep = netdev_priv(dev);
 357         const struct fs_platform_info *fpi = fep->fpi;
 358         struct fec __iomem *fecp = fep->fec.fecp;
 359
 360         struct fec_info* feci= fep->phydev->bus->priv;
 361
 362         int i;
 363
 364         if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0)
 365                 return;         /* already down */
 366
 367         FW(fecp, x_cntrl, 0x01);        /* Graceful transmit stop */
 368         for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) &&
 369              i < FEC_RESET_DELAY; i++)
 370                 udelay(1);
 371
 372         if (i == FEC_RESET_DELAY)
 373                 dev_warn(fep->dev, "FEC timeout on graceful transmit stop\n");
 374         /*
 375          * Disable FEC. Let only MII interrupts.
 376          */
 377         FW(fecp, imask, 0);
 378         FC(fecp, ecntrl, FEC_ECNTRL_ETHER_EN);
 379
 380         fs_cleanup_bds(dev);
 381
 382         /* shut down FEC1? that's where the mii bus is */
 383         if (fpi->has_phy) {
 384                 FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
 385                 FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
 386                 FW(fecp, ievent, FEC_ENET_MII);
 387                 FW(fecp, mii_speed, feci->mii_speed);
 388         }
 389 }
 390
 391 static void napi_clear_rx_event(struct net_device *dev)
 392 {
 393         struct fs_enet_private *fep = netdev_priv(dev);
 394         struct fec __iomem *fecp = fep->fec.fecp;
 395
 396         FW(fecp, ievent, FEC_NAPI_RX_EVENT_MSK);
 397 }
 398
 399 static void napi_enable_rx(struct net_device *dev)
 400 {
 401         struct fs_enet_private *fep = netdev_priv(dev);
 402         struct fec __iomem *fecp = fep->fec.fecp;
 403
 404         FS(fecp, imask, FEC_NAPI_RX_EVENT_MSK);
 405 }
 406
 407 static void napi_disable_rx(struct net_device *dev)
 408 {
 409         struct fs_enet_private *fep = netdev_priv(dev);
 410         struct fec __iomem *fecp = fep->fec.fecp;
 411
 412         FC(fecp, imask, FEC_NAPI_RX_EVENT_MSK);
 413 }
 414
 415 static void rx_bd_done(struct net_device *dev)
 416 {
 417         struct fs_enet_private *fep = netdev_priv(dev);
 418         struct fec __iomem *fecp = fep->fec.fecp;
 419
 420         FW(fecp, r_des_active, 0x01000000);
 421 }
 422
 423 static void tx_kickstart(struct net_device *dev)
 424 {
 425         struct fs_enet_private *fep = netdev_priv(dev);
 426         struct fec __iomem *fecp = fep->fec.fecp;
 427
 428         FW(fecp, x_des_active, 0x01000000);
 429 }
 430
 431 static u32 get_int_events(struct net_device *dev)
 432 {
 433         struct fs_enet_private *fep = netdev_priv(dev);
 434         struct fec __iomem *fecp = fep->fec.fecp;
 435
 436         return FR(fecp, ievent) & FR(fecp, imask);
 437 }
 438
 439 static void clear_int_events(struct net_device *dev, u32 int_events)
 440 {
 441         struct fs_enet_private *fep = netdev_priv(dev);
 442         struct fec __iomem *fecp = fep->fec.fecp;
 443
 444         FW(fecp, ievent, int_events);
 445 }
 446
 447 static void ev_error(struct net_device *dev, u32 int_events)
 448 {
 449         struct fs_enet_private *fep = netdev_priv(dev);
 450
 451         dev_warn(fep->dev, "FEC ERROR(s) 0x%x\n", int_events);
 452 }
 453
 454 static int get_regs(struct net_device *dev, void *p, int *sizep)
 455 {
 456         struct fs_enet_private *fep = netdev_priv(dev);
 457
 458         if (*sizep < sizeof(struct fec))
 459                 return -EINVAL;
 460
 461         memcpy_fromio(p, fep->fec.fecp, sizeof(struct fec));
 462
 463         return 0;
 464 }
 465
 466 static int get_regs_len(struct net_device *dev)
 467 {
 468         return sizeof(struct fec);
 469 }
 470
 471 static void tx_restart(struct net_device *dev)
 472 {
 473         /* nothing */
 474 }
 475
 476 /*************************************************************************/
 477
 478 const struct fs_ops fs_fec_ops = {
 479         .setup_data             = setup_data,
 480         .cleanup_data           = cleanup_data,
 481         .set_multicast_list     = set_multicast_list,
 482         .restart                = restart,
 483         .stop                   = stop,
 484         .napi_clear_rx_event    = napi_clear_rx_event,
 485         .napi_enable_rx         = napi_enable_rx,
 486         .napi_disable_rx        = napi_disable_rx,
 487         .rx_bd_done             = rx_bd_done,
 488         .tx_kickstart           = tx_kickstart,
 489         .get_int_events         = get_int_events,
 490         .clear_int_events       = clear_int_events,
 491         .ev_error               = ev_error,
 492         .get_regs               = get_regs,
 493         .get_regs_len           = get_regs_len,
 494         .tx_restart             = tx_restart,
 495         .allocate_bd            = allocate_bd,
 496         .free_bd                = free_bd,
 497 };