drivers/net/fs_enet/mac-scc.c

   1 /*
   2  * Ethernet on Serial Communications Controller (SCC) driver for Motorola MPC8xx and MPC82xx.
   3  *
   4  * Copyright (c) 2003 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/slab.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/init.h>
  25 #include <linux/delay.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/mii.h>
  31 #include <linux/ethtool.h>
  32 #include <linux/bitops.h>
  33 #include <linux/fs.h>
  34 #include <linux/platform_device.h>
  35
  36 #include <asm/irq.h>
  37 #include <asm/uaccess.h>
  38
  39 #ifdef CONFIG_8xx
  40 #include <asm/8xx_immap.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/mpc8xx.h>
  43 #include <asm/cpm1.h>
  44 #endif
  45
  46 #ifdef CONFIG_PPC_CPM_NEW_BINDING
  47 #include <asm/of_platform.h>
  48 #endif
  49
  50 #include "fs_enet.h"
  51
  52 /*************************************************/
  53
  54 #if defined(CONFIG_CPM1)
  55 /* for a 8xx __raw_xxx's are sufficient */
  56 #define __fs_out32(addr, x)     __raw_writel(x, addr)
  57 #define __fs_out16(addr, x)     __raw_writew(x, addr)
  58 #define __fs_out8(addr, x)      __raw_writeb(x, addr)
  59 #define __fs_in32(addr) __raw_readl(addr)
  60 #define __fs_in16(addr) __raw_readw(addr)
  61 #define __fs_in8(addr)  __raw_readb(addr)
  62 #else
  63 /* for others play it safe */
  64 #define __fs_out32(addr, x)     out_be32(addr, x)
  65 #define __fs_out16(addr, x)     out_be16(addr, x)
  66 #define __fs_in32(addr) in_be32(addr)
  67 #define __fs_in16(addr) in_be16(addr)
  68 #endif
  69
  70 /* write, read, set bits, clear bits */
  71 #define W32(_p, _m, _v) __fs_out32(&(_p)->_m, (_v))
  72 #define R32(_p, _m)     __fs_in32(&(_p)->_m)
  73 #define S32(_p, _m, _v) W32(_p, _m, R32(_p, _m) | (_v))
  74 #define C32(_p, _m, _v) W32(_p, _m, R32(_p, _m) & ~(_v))
  75
  76 #define W16(_p, _m, _v) __fs_out16(&(_p)->_m, (_v))
  77 #define R16(_p, _m)     __fs_in16(&(_p)->_m)
  78 #define S16(_p, _m, _v) W16(_p, _m, R16(_p, _m) | (_v))
  79 #define C16(_p, _m, _v) W16(_p, _m, R16(_p, _m) & ~(_v))
  80
  81 #define W8(_p, _m, _v)  __fs_out8(&(_p)->_m, (_v))
  82 #define R8(_p, _m)      __fs_in8(&(_p)->_m)
  83 #define S8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) | (_v))
  84 #define C8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) & ~(_v))
  85
  86 #define SCC_MAX_MULTICAST_ADDRS 64
  87
  88 /*
  89  * Delay to wait for SCC reset command to complete (in us)
  90  */
  91 #define SCC_RESET_DELAY         50
  92
  93 static inline int scc_cr_cmd(struct fs_enet_private *fep, u32 op)
  94 {
  95         const struct fs_platform_info *fpi = fep->fpi;
  96
  97         return cpm_command(fpi->cp_command, op);
  98 }
  99
 100 static int do_pd_setup(struct fs_enet_private *fep)
 101 {
 102 #ifdef CONFIG_PPC_CPM_NEW_BINDING
 103         struct of_device *ofdev = to_of_device(fep->dev);
 104
 105         fep->interrupt = of_irq_to_resource(ofdev->node, 0, NULL);
 106         if (fep->interrupt == NO_IRQ)
 107                 return -EINVAL;
 108
 109         fep->scc.sccp = of_iomap(ofdev->node, 0);
 110         if (!fep->scc.sccp)
 111                 return -EINVAL;
 112
 113         fep->scc.ep = of_iomap(ofdev->node, 1);
 114         if (!fep->scc.ep) {
 115                 iounmap(fep->scc.sccp);
 116                 return -EINVAL;
 117         }
 118 #else
 119         struct platform_device *pdev = to_platform_device(fep->dev);
 120         struct resource *r;
 121
 122         /* Fill out IRQ field */
 123         fep->interrupt = platform_get_irq_byname(pdev, "interrupt");
 124         if (fep->interrupt < 0)
 125                 return -EINVAL;
 126
 127         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 128         fep->scc.sccp = ioremap(r->start, r->end - r->start + 1);
 129
 130         if (fep->scc.sccp == NULL)
 131                 return -EINVAL;
 132
 133         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pram");
 134         fep->scc.ep = ioremap(r->start, r->end - r->start + 1);
 135
 136         if (fep->scc.ep == NULL)
 137                 return -EINVAL;
 138 #endif
 139
 140         return 0;
 141 }
 142
 143 #define SCC_NAPI_RX_EVENT_MSK   (SCCE_ENET_RXF | SCCE_ENET_RXB)
 144 #define SCC_RX_EVENT            (SCCE_ENET_RXF)
 145 #define SCC_TX_EVENT            (SCCE_ENET_TXB)
 146 #define SCC_ERR_EVENT_MSK       (SCCE_ENET_TXE | SCCE_ENET_BSY)
 147
 148 static int setup_data(struct net_device *dev)
 149 {
 150         struct fs_enet_private *fep = netdev_priv(dev);
 151
 152 #ifndef CONFIG_PPC_CPM_NEW_BINDING
 153         struct fs_platform_info *fpi = fep->fpi;
 154
 155         fep->scc.idx = fs_get_scc_index(fpi->fs_no);
 156         if ((unsigned int)fep->fcc.idx >= 4) /* max 4 SCCs */
 157                 return -EINVAL;
 158
 159         fpi->cp_command = fep->fcc.idx << 6;
 160 #endif
 161
 162         do_pd_setup(fep);
 163
 164         fep->scc.hthi = 0;
 165         fep->scc.htlo = 0;
 166
 167         fep->ev_napi_rx = SCC_NAPI_RX_EVENT_MSK;
 168         fep->ev_rx = SCC_RX_EVENT;
 169         fep->ev_tx = SCC_TX_EVENT | SCCE_ENET_TXE;
 170         fep->ev_err = SCC_ERR_EVENT_MSK;
 171
 172         return 0;
 173 }
 174
 175 static int allocate_bd(struct net_device *dev)
 176 {
 177         struct fs_enet_private *fep = netdev_priv(dev);
 178         const struct fs_platform_info *fpi = fep->fpi;
 179
 180         fep->ring_mem_addr = cpm_dpalloc((fpi->tx_ring + fpi->rx_ring) *
 181                                          sizeof(cbd_t), 8);
 182         if (IS_ERR_VALUE(fep->ring_mem_addr))
 183                 return -ENOMEM;
 184
 185         fep->ring_base = (void __iomem __force*)
 186                 cpm_dpram_addr(fep->ring_mem_addr);
 187
 188         return 0;
 189 }
 190
 191 static void free_bd(struct net_device *dev)
 192 {
 193         struct fs_enet_private *fep = netdev_priv(dev);
 194
 195         if (fep->ring_base)
 196                 cpm_dpfree(fep->ring_mem_addr);
 197 }
 198
 199 static void cleanup_data(struct net_device *dev)
 200 {
 201         /* nothing */
 202 }
 203
 204 static void set_promiscuous_mode(struct net_device *dev)
 205 {
 206         struct fs_enet_private *fep = netdev_priv(dev);
 207         scc_t __iomem *sccp = fep->scc.sccp;
 208
 209         S16(sccp, scc_psmr, SCC_PSMR_PRO);
 210 }
 211
 212 static void set_multicast_start(struct net_device *dev)
 213 {
 214         struct fs_enet_private *fep = netdev_priv(dev);
 215         scc_enet_t __iomem *ep = fep->scc.ep;
 216
 217         W16(ep, sen_gaddr1, 0);
 218         W16(ep, sen_gaddr2, 0);
 219         W16(ep, sen_gaddr3, 0);
 220         W16(ep, sen_gaddr4, 0);
 221 }
 222
 223 static void set_multicast_one(struct net_device *dev, const u8 * mac)
 224 {
 225         struct fs_enet_private *fep = netdev_priv(dev);
 226         scc_enet_t __iomem *ep = fep->scc.ep;
 227         u16 taddrh, taddrm, taddrl;
 228
 229         taddrh = ((u16) mac[5] << 8) | mac[4];
 230         taddrm = ((u16) mac[3] << 8) | mac[2];
 231         taddrl = ((u16) mac[1] << 8) | mac[0];
 232
 233         W16(ep, sen_taddrh, taddrh);
 234         W16(ep, sen_taddrm, taddrm);
 235         W16(ep, sen_taddrl, taddrl);
 236         scc_cr_cmd(fep, CPM_CR_SET_GADDR);
 237 }
 238
 239 static void set_multicast_finish(struct net_device *dev)
 240 {
 241         struct fs_enet_private *fep = netdev_priv(dev);
 242         scc_t __iomem *sccp = fep->scc.sccp;
 243         scc_enet_t __iomem *ep = fep->scc.ep;
 244
 245         /* clear promiscuous always */
 246         C16(sccp, scc_psmr, SCC_PSMR_PRO);
 247
 248         /* if all multi or too many multicasts; just enable all */
 249         if ((dev->flags & IFF_ALLMULTI) != 0 ||
 250             dev->mc_count > SCC_MAX_MULTICAST_ADDRS) {
 251
 252                 W16(ep, sen_gaddr1, 0xffff);
 253                 W16(ep, sen_gaddr2, 0xffff);
 254                 W16(ep, sen_gaddr3, 0xffff);
 255                 W16(ep, sen_gaddr4, 0xffff);
 256         }
 257 }
 258
 259 static void set_multicast_list(struct net_device *dev)
 260 {
 261         struct dev_mc_list *pmc;
 262
 263         if ((dev->flags & IFF_PROMISC) == 0) {
 264                 set_multicast_start(dev);
 265                 for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next)
 266                         set_multicast_one(dev, pmc->dmi_addr);
 267                 set_multicast_finish(dev);
 268         } else
 269                 set_promiscuous_mode(dev);
 270 }
 271
 272 /*
 273  * This function is called to start or restart the FEC during a link
 274  * change.  This only happens when switching between half and full
 275  * duplex.
 276  */
 277 static void restart(struct net_device *dev)
 278 {
 279         struct fs_enet_private *fep = netdev_priv(dev);
 280         scc_t __iomem *sccp = fep->scc.sccp;
 281         scc_enet_t __iomem *ep = fep->scc.ep;
 282         const struct fs_platform_info *fpi = fep->fpi;
 283         u16 paddrh, paddrm, paddrl;
 284         const unsigned char *mac;
 285         int i;
 286
 287         C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 288
 289         /* clear everything (slow & steady does it) */
 290         for (i = 0; i < sizeof(*ep); i++)
 291                 __fs_out8((u8 __iomem *)ep + i, 0);
 292
 293         /* point to bds */
 294         W16(ep, sen_genscc.scc_rbase, fep->ring_mem_addr);
 295         W16(ep, sen_genscc.scc_tbase,
 296             fep->ring_mem_addr + sizeof(cbd_t) * fpi->rx_ring);
 297
 298         /* Initialize function code registers for big-endian.
 299          */
 300         W8(ep, sen_genscc.scc_rfcr, SCC_EB);
 301         W8(ep, sen_genscc.scc_tfcr, SCC_EB);
 302
 303         /* Set maximum bytes per receive buffer.
 304          * This appears to be an Ethernet frame size, not the buffer
 305          * fragment size.  It must be a multiple of four.
 306          */
 307         W16(ep, sen_genscc.scc_mrblr, 0x5f0);
 308
 309         /* Set CRC preset and mask.
 310          */
 311         W32(ep, sen_cpres, 0xffffffff);
 312         W32(ep, sen_cmask, 0xdebb20e3);
 313
 314         W32(ep, sen_crcec, 0);  /* CRC Error counter */
 315         W32(ep, sen_alec, 0);   /* alignment error counter */
 316         W32(ep, sen_disfc, 0);  /* discard frame counter */
 317
 318         W16(ep, sen_pads, 0x8888);      /* Tx short frame pad character */
 319         W16(ep, sen_retlim, 15);        /* Retry limit threshold */
 320
 321         W16(ep, sen_maxflr, 0x5ee);     /* maximum frame length register */
 322
 323         W16(ep, sen_minflr, PKT_MINBUF_SIZE);   /* minimum frame length register */
 324
 325         W16(ep, sen_maxd1, 0x000005f0); /* maximum DMA1 length */
 326         W16(ep, sen_maxd2, 0x000005f0); /* maximum DMA2 length */
 327
 328         /* Clear hash tables.
 329          */
 330         W16(ep, sen_gaddr1, 0);
 331         W16(ep, sen_gaddr2, 0);
 332         W16(ep, sen_gaddr3, 0);
 333         W16(ep, sen_gaddr4, 0);
 334         W16(ep, sen_iaddr1, 0);
 335         W16(ep, sen_iaddr2, 0);
 336         W16(ep, sen_iaddr3, 0);
 337         W16(ep, sen_iaddr4, 0);
 338
 339         /* set address
 340          */
 341         mac = dev->dev_addr;
 342         paddrh = ((u16) mac[5] << 8) | mac[4];
 343         paddrm = ((u16) mac[3] << 8) | mac[2];
 344         paddrl = ((u16) mac[1] << 8) | mac[0];
 345
 346         W16(ep, sen_paddrh, paddrh);
 347         W16(ep, sen_paddrm, paddrm);
 348         W16(ep, sen_paddrl, paddrl);
 349
 350         W16(ep, sen_pper, 0);
 351         W16(ep, sen_taddrl, 0);
 352         W16(ep, sen_taddrm, 0);
 353         W16(ep, sen_taddrh, 0);
 354
 355         fs_init_bds(dev);
 356
 357         scc_cr_cmd(fep, CPM_CR_INIT_TRX);
 358
 359         W16(sccp, scc_scce, 0xffff);
 360
 361         /* Enable interrupts we wish to service.
 362          */
 363         W16(sccp, scc_sccm, SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
 364
 365         /* Set GSMR_H to enable all normal operating modes.
 366          * Set GSMR_L to enable Ethernet to MC68160.
 367          */
 368         W32(sccp, scc_gsmrh, 0);
 369         W32(sccp, scc_gsmrl,
 370             SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 |
 371             SCC_GSMRL_MODE_ENET);
 372
 373         /* Set sync/delimiters.
 374          */
 375         W16(sccp, scc_dsr, 0xd555);
 376
 377         /* Set processing mode.  Use Ethernet CRC, catch broadcast, and
 378          * start frame search 22 bit times after RENA.
 379          */
 380         W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
 381
 382         /* Set full duplex mode if needed */
 383         if (fep->phydev->duplex)
 384                 S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);
 385
 386         S32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 387 }
 388
 389 static void stop(struct net_device *dev)
 390 {
 391         struct fs_enet_private *fep = netdev_priv(dev);
 392         scc_t __iomem *sccp = fep->scc.sccp;
 393         int i;
 394
 395         for (i = 0; (R16(sccp, scc_sccm) == 0) && i < SCC_RESET_DELAY; i++)
 396                 udelay(1);
 397
 398         if (i == SCC_RESET_DELAY)
 399                 printk(KERN_WARNING DRV_MODULE_NAME
 400                        ": %s SCC timeout on graceful transmit stop\n",
 401                        dev->name);
 402
 403         W16(sccp, scc_sccm, 0);
 404         C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 405
 406         fs_cleanup_bds(dev);
 407 }
 408
 409 static void pre_request_irq(struct net_device *dev, int irq)
 410 {
 411 #ifndef CONFIG_PPC_MERGE
 412         immap_t *immap = fs_enet_immap;
 413         u32 siel;
 414
 415         /* SIU interrupt */
 416         if (irq >= SIU_IRQ0 && irq < SIU_LEVEL7) {
 417
 418                 siel = in_be32(&immap->im_siu_conf.sc_siel);
 419                 if ((irq & 1) == 0)
 420                         siel |= (0x80000000 >> irq);
 421                 else
 422                         siel &= ~(0x80000000 >> (irq & ~1));
 423                 out_be32(&immap->im_siu_conf.sc_siel, siel);
 424         }
 425 #endif
 426 }
 427
 428 static void post_free_irq(struct net_device *dev, int irq)
 429 {
 430         /* nothing */
 431 }
 432
 433 static void napi_clear_rx_event(struct net_device *dev)
 434 {
 435         struct fs_enet_private *fep = netdev_priv(dev);
 436         scc_t __iomem *sccp = fep->scc.sccp;
 437
 438         W16(sccp, scc_scce, SCC_NAPI_RX_EVENT_MSK);
 439 }
 440
 441 static void napi_enable_rx(struct net_device *dev)
 442 {
 443         struct fs_enet_private *fep = netdev_priv(dev);
 444         scc_t __iomem *sccp = fep->scc.sccp;
 445
 446         S16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
 447 }
 448
 449 static void napi_disable_rx(struct net_device *dev)
 450 {
 451         struct fs_enet_private *fep = netdev_priv(dev);
 452         scc_t __iomem *sccp = fep->scc.sccp;
 453
 454         C16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
 455 }
 456
 457 static void rx_bd_done(struct net_device *dev)
 458 {
 459         /* nothing */
 460 }
 461
 462 static void tx_kickstart(struct net_device *dev)
 463 {
 464         /* nothing */
 465 }
 466
 467 static u32 get_int_events(struct net_device *dev)
 468 {
 469         struct fs_enet_private *fep = netdev_priv(dev);
 470         scc_t __iomem *sccp = fep->scc.sccp;
 471
 472         return (u32) R16(sccp, scc_scce);
 473 }
 474
 475 static void clear_int_events(struct net_device *dev, u32 int_events)
 476 {
 477         struct fs_enet_private *fep = netdev_priv(dev);
 478         scc_t __iomem *sccp = fep->scc.sccp;
 479
 480         W16(sccp, scc_scce, int_events & 0xffff);
 481 }
 482
 483 static void ev_error(struct net_device *dev, u32 int_events)
 484 {
 485         printk(KERN_WARNING DRV_MODULE_NAME
 486                ": %s SCC ERROR(s) 0x%x\n", dev->name, int_events);
 487 }
 488
 489 static int get_regs(struct net_device *dev, void *p, int *sizep)
 490 {
 491         struct fs_enet_private *fep = netdev_priv(dev);
 492
 493         if (*sizep < sizeof(scc_t) + sizeof(scc_enet_t __iomem *))
 494                 return -EINVAL;
 495
 496         memcpy_fromio(p, fep->scc.sccp, sizeof(scc_t));
 497         p = (char *)p + sizeof(scc_t);
 498
 499         memcpy_fromio(p, fep->scc.ep, sizeof(scc_enet_t __iomem *));
 500
 501         return 0;
 502 }
 503
 504 static int get_regs_len(struct net_device *dev)
 505 {
 506         return sizeof(scc_t) + sizeof(scc_enet_t __iomem *);
 507 }
 508
 509 static void tx_restart(struct net_device *dev)
 510 {
 511         struct fs_enet_private *fep = netdev_priv(dev);
 512
 513         scc_cr_cmd(fep, CPM_CR_RESTART_TX);
 514 }
 515
 516
 517
 518 /*************************************************************************/
 519
 520 const struct fs_ops fs_scc_ops = {
 521         .setup_data             = setup_data,
 522         .cleanup_data           = cleanup_data,
 523         .set_multicast_list     = set_multicast_list,
 524         .restart                = restart,
 525         .stop                   = stop,
 526         .pre_request_irq        = pre_request_irq,
 527         .post_free_irq          = post_free_irq,
 528         .napi_clear_rx_event    = napi_clear_rx_event,
 529         .napi_enable_rx         = napi_enable_rx,
 530         .napi_disable_rx        = napi_disable_rx,
 531         .rx_bd_done             = rx_bd_done,
 532         .tx_kickstart           = tx_kickstart,
 533         .get_int_events         = get_int_events,
 534         .clear_int_events       = clear_int_events,
 535         .ev_error               = ev_error,
 536         .get_regs               = get_regs,
 537         .get_regs_len           = get_regs_len,
 538         .tx_restart             = tx_restart,
 539         .allocate_bd            = allocate_bd,
 540         .free_bd                = free_bd,
 541 };