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/commproc.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 #define MAX_CR_CMD_LOOPS        10000
  93
  94 static inline int scc_cr_cmd(struct fs_enet_private *fep, u32 op)
  95 {
  96         const struct fs_platform_info *fpi = fep->fpi;
  97         int i;
  98
  99         W16(cpmp, cp_cpcr, fpi->cp_command | CPM_CR_FLG | (op << 8));
 100         for (i = 0; i < MAX_CR_CMD_LOOPS; i++)
 101                 if ((R16(cpmp, cp_cpcr) & CPM_CR_FLG) == 0)
 102                         return 0;
 103
 104         printk(KERN_ERR "%s(): Not able to issue CPM command\n",
 105                 __FUNCTION__);
 106         return 1;
 107 }
 108
 109 static int do_pd_setup(struct fs_enet_private *fep)
 110 {
 111 #ifdef CONFIG_PPC_CPM_NEW_BINDING
 112         struct of_device *ofdev = to_of_device(fep->dev);
 113
 114         fep->interrupt = of_irq_to_resource(ofdev->node, 0, NULL);
 115         if (fep->interrupt == NO_IRQ)
 116                 return -EINVAL;
 117
 118         fep->scc.sccp = of_iomap(ofdev->node, 0);
 119         if (!fep->scc.sccp)
 120                 return -EINVAL;
 121
 122         fep->scc.ep = of_iomap(ofdev->node, 1);
 123         if (!fep->scc.ep) {
 124                 iounmap(fep->scc.sccp);
 125                 return -EINVAL;
 126         }
 127 #else
 128         struct platform_device *pdev = to_platform_device(fep->dev);
 129         struct resource *r;
 130
 131         /* Fill out IRQ field */
 132         fep->interrupt = platform_get_irq_byname(pdev, "interrupt");
 133         if (fep->interrupt < 0)
 134                 return -EINVAL;
 135
 136         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 137         fep->scc.sccp = ioremap(r->start, r->end - r->start + 1);
 138
 139         if (fep->scc.sccp == NULL)
 140                 return -EINVAL;
 141
 142         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pram");
 143         fep->scc.ep = ioremap(r->start, r->end - r->start + 1);
 144
 145         if (fep->scc.ep == NULL)
 146                 return -EINVAL;
 147 #endif
 148
 149         return 0;
 150 }
 151
 152 #define SCC_NAPI_RX_EVENT_MSK   (SCCE_ENET_RXF | SCCE_ENET_RXB)
 153 #define SCC_RX_EVENT            (SCCE_ENET_RXF)
 154 #define SCC_TX_EVENT            (SCCE_ENET_TXB)
 155 #define SCC_ERR_EVENT_MSK       (SCCE_ENET_TXE | SCCE_ENET_BSY)
 156
 157 static int setup_data(struct net_device *dev)
 158 {
 159         struct fs_enet_private *fep = netdev_priv(dev);
 160
 161 #ifdef CONFIG_PPC_CPM_NEW_BINDING
 162         struct fs_platform_info *fpi = fep->fpi;
 163
 164         fep->scc.idx = fs_get_scc_index(fpi->fs_no);
 165         if ((unsigned int)fep->fcc.idx >= 4) /* max 4 SCCs */
 166                 return -EINVAL;
 167
 168         fpi->cp_command = fep->fcc.idx << 6;
 169 #endif
 170
 171         do_pd_setup(fep);
 172
 173         fep->scc.hthi = 0;
 174         fep->scc.htlo = 0;
 175
 176         fep->ev_napi_rx = SCC_NAPI_RX_EVENT_MSK;
 177         fep->ev_rx = SCC_RX_EVENT;
 178         fep->ev_tx = SCC_TX_EVENT | SCCE_ENET_TXE;
 179         fep->ev_err = SCC_ERR_EVENT_MSK;
 180
 181         return 0;
 182 }
 183
 184 static int allocate_bd(struct net_device *dev)
 185 {
 186         struct fs_enet_private *fep = netdev_priv(dev);
 187         const struct fs_platform_info *fpi = fep->fpi;
 188
 189         fep->ring_mem_addr = cpm_dpalloc((fpi->tx_ring + fpi->rx_ring) *
 190                                          sizeof(cbd_t), 8);
 191         if (IS_ERR_VALUE(fep->ring_mem_addr))
 192                 return -ENOMEM;
 193
 194         fep->ring_base = (void __iomem __force*)
 195                 cpm_dpram_addr(fep->ring_mem_addr);
 196
 197         return 0;
 198 }
 199
 200 static void free_bd(struct net_device *dev)
 201 {
 202         struct fs_enet_private *fep = netdev_priv(dev);
 203
 204         if (fep->ring_base)
 205                 cpm_dpfree(fep->ring_mem_addr);
 206 }
 207
 208 static void cleanup_data(struct net_device *dev)
 209 {
 210         /* nothing */
 211 }
 212
 213 static void set_promiscuous_mode(struct net_device *dev)
 214 {
 215         struct fs_enet_private *fep = netdev_priv(dev);
 216         scc_t __iomem *sccp = fep->scc.sccp;
 217
 218         S16(sccp, scc_psmr, SCC_PSMR_PRO);
 219 }
 220
 221 static void set_multicast_start(struct net_device *dev)
 222 {
 223         struct fs_enet_private *fep = netdev_priv(dev);
 224         scc_enet_t __iomem *ep = fep->scc.ep;
 225
 226         W16(ep, sen_gaddr1, 0);
 227         W16(ep, sen_gaddr2, 0);
 228         W16(ep, sen_gaddr3, 0);
 229         W16(ep, sen_gaddr4, 0);
 230 }
 231
 232 static void set_multicast_one(struct net_device *dev, const u8 * mac)
 233 {
 234         struct fs_enet_private *fep = netdev_priv(dev);
 235         scc_enet_t __iomem *ep = fep->scc.ep;
 236         u16 taddrh, taddrm, taddrl;
 237
 238         taddrh = ((u16) mac[5] << 8) | mac[4];
 239         taddrm = ((u16) mac[3] << 8) | mac[2];
 240         taddrl = ((u16) mac[1] << 8) | mac[0];
 241
 242         W16(ep, sen_taddrh, taddrh);
 243         W16(ep, sen_taddrm, taddrm);
 244         W16(ep, sen_taddrl, taddrl);
 245         scc_cr_cmd(fep, CPM_CR_SET_GADDR);
 246 }
 247
 248 static void set_multicast_finish(struct net_device *dev)
 249 {
 250         struct fs_enet_private *fep = netdev_priv(dev);
 251         scc_t __iomem *sccp = fep->scc.sccp;
 252         scc_enet_t __iomem *ep = fep->scc.ep;
 253
 254         /* clear promiscuous always */
 255         C16(sccp, scc_psmr, SCC_PSMR_PRO);
 256
 257         /* if all multi or too many multicasts; just enable all */
 258         if ((dev->flags & IFF_ALLMULTI) != 0 ||
 259             dev->mc_count > SCC_MAX_MULTICAST_ADDRS) {
 260
 261                 W16(ep, sen_gaddr1, 0xffff);
 262                 W16(ep, sen_gaddr2, 0xffff);
 263                 W16(ep, sen_gaddr3, 0xffff);
 264                 W16(ep, sen_gaddr4, 0xffff);
 265         }
 266 }
 267
 268 static void set_multicast_list(struct net_device *dev)
 269 {
 270         struct dev_mc_list *pmc;
 271
 272         if ((dev->flags & IFF_PROMISC) == 0) {
 273                 set_multicast_start(dev);
 274                 for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next)
 275                         set_multicast_one(dev, pmc->dmi_addr);
 276                 set_multicast_finish(dev);
 277         } else
 278                 set_promiscuous_mode(dev);
 279 }
 280
 281 /*
 282  * This function is called to start or restart the FEC during a link
 283  * change.  This only happens when switching between half and full
 284  * duplex.
 285  */
 286 static void restart(struct net_device *dev)
 287 {
 288         struct fs_enet_private *fep = netdev_priv(dev);
 289         scc_t __iomem *sccp = fep->scc.sccp;
 290         scc_enet_t __iomem *ep = fep->scc.ep;
 291         const struct fs_platform_info *fpi = fep->fpi;
 292         u16 paddrh, paddrm, paddrl;
 293         const unsigned char *mac;
 294         int i;
 295
 296         C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 297
 298         /* clear everything (slow & steady does it) */
 299         for (i = 0; i < sizeof(*ep); i++)
 300                 __fs_out8((u8 __iomem *)ep + i, 0);
 301
 302         /* point to bds */
 303         W16(ep, sen_genscc.scc_rbase, fep->ring_mem_addr);
 304         W16(ep, sen_genscc.scc_tbase,
 305             fep->ring_mem_addr + sizeof(cbd_t) * fpi->rx_ring);
 306
 307         /* Initialize function code registers for big-endian.
 308          */
 309         W8(ep, sen_genscc.scc_rfcr, SCC_EB);
 310         W8(ep, sen_genscc.scc_tfcr, SCC_EB);
 311
 312         /* Set maximum bytes per receive buffer.
 313          * This appears to be an Ethernet frame size, not the buffer
 314          * fragment size.  It must be a multiple of four.
 315          */
 316         W16(ep, sen_genscc.scc_mrblr, 0x5f0);
 317
 318         /* Set CRC preset and mask.
 319          */
 320         W32(ep, sen_cpres, 0xffffffff);
 321         W32(ep, sen_cmask, 0xdebb20e3);
 322
 323         W32(ep, sen_crcec, 0);  /* CRC Error counter */
 324         W32(ep, sen_alec, 0);   /* alignment error counter */
 325         W32(ep, sen_disfc, 0);  /* discard frame counter */
 326
 327         W16(ep, sen_pads, 0x8888);      /* Tx short frame pad character */
 328         W16(ep, sen_retlim, 15);        /* Retry limit threshold */
 329
 330         W16(ep, sen_maxflr, 0x5ee);     /* maximum frame length register */
 331
 332         W16(ep, sen_minflr, PKT_MINBUF_SIZE);   /* minimum frame length register */
 333
 334         W16(ep, sen_maxd1, 0x000005f0); /* maximum DMA1 length */
 335         W16(ep, sen_maxd2, 0x000005f0); /* maximum DMA2 length */
 336
 337         /* Clear hash tables.
 338          */
 339         W16(ep, sen_gaddr1, 0);
 340         W16(ep, sen_gaddr2, 0);
 341         W16(ep, sen_gaddr3, 0);
 342         W16(ep, sen_gaddr4, 0);
 343         W16(ep, sen_iaddr1, 0);
 344         W16(ep, sen_iaddr2, 0);
 345         W16(ep, sen_iaddr3, 0);
 346         W16(ep, sen_iaddr4, 0);
 347
 348         /* set address
 349          */
 350         mac = dev->dev_addr;
 351         paddrh = ((u16) mac[5] << 8) | mac[4];
 352         paddrm = ((u16) mac[3] << 8) | mac[2];
 353         paddrl = ((u16) mac[1] << 8) | mac[0];
 354
 355         W16(ep, sen_paddrh, paddrh);
 356         W16(ep, sen_paddrm, paddrm);
 357         W16(ep, sen_paddrl, paddrl);
 358
 359         W16(ep, sen_pper, 0);
 360         W16(ep, sen_taddrl, 0);
 361         W16(ep, sen_taddrm, 0);
 362         W16(ep, sen_taddrh, 0);
 363
 364         fs_init_bds(dev);
 365
 366         scc_cr_cmd(fep, CPM_CR_INIT_TRX);
 367
 368         W16(sccp, scc_scce, 0xffff);
 369
 370         /* Enable interrupts we wish to service.
 371          */
 372         W16(sccp, scc_sccm, SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
 373
 374         /* Set GSMR_H to enable all normal operating modes.
 375          * Set GSMR_L to enable Ethernet to MC68160.
 376          */
 377         W32(sccp, scc_gsmrh, 0);
 378         W32(sccp, scc_gsmrl,
 379             SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 |
 380             SCC_GSMRL_MODE_ENET);
 381
 382         /* Set sync/delimiters.
 383          */
 384         W16(sccp, scc_dsr, 0xd555);
 385
 386         /* Set processing mode.  Use Ethernet CRC, catch broadcast, and
 387          * start frame search 22 bit times after RENA.
 388          */
 389         W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
 390
 391         /* Set full duplex mode if needed */
 392         if (fep->phydev->duplex)
 393                 S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);
 394
 395         S32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 396 }
 397
 398 static void stop(struct net_device *dev)
 399 {
 400         struct fs_enet_private *fep = netdev_priv(dev);
 401         scc_t __iomem *sccp = fep->scc.sccp;
 402         int i;
 403
 404         for (i = 0; (R16(sccp, scc_sccm) == 0) && i < SCC_RESET_DELAY; i++)
 405                 udelay(1);
 406
 407         if (i == SCC_RESET_DELAY)
 408                 printk(KERN_WARNING DRV_MODULE_NAME
 409                        ": %s SCC timeout on graceful transmit stop\n",
 410                        dev->name);
 411
 412         W16(sccp, scc_sccm, 0);
 413         C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 414
 415         fs_cleanup_bds(dev);
 416 }
 417
 418 static void pre_request_irq(struct net_device *dev, int irq)
 419 {
 420 #ifndef CONFIG_PPC_MERGE
 421         immap_t *immap = fs_enet_immap;
 422         u32 siel;
 423
 424         /* SIU interrupt */
 425         if (irq >= SIU_IRQ0 && irq < SIU_LEVEL7) {
 426
 427                 siel = in_be32(&immap->im_siu_conf.sc_siel);
 428                 if ((irq & 1) == 0)
 429                         siel |= (0x80000000 >> irq);
 430                 else
 431                         siel &= ~(0x80000000 >> (irq & ~1));
 432                 out_be32(&immap->im_siu_conf.sc_siel, siel);
 433         }
 434 #endif
 435 }
 436
 437 static void post_free_irq(struct net_device *dev, int irq)
 438 {
 439         /* nothing */
 440 }
 441
 442 static void napi_clear_rx_event(struct net_device *dev)
 443 {
 444         struct fs_enet_private *fep = netdev_priv(dev);
 445         scc_t __iomem *sccp = fep->scc.sccp;
 446
 447         W16(sccp, scc_scce, SCC_NAPI_RX_EVENT_MSK);
 448 }
 449
 450 static void napi_enable_rx(struct net_device *dev)
 451 {
 452         struct fs_enet_private *fep = netdev_priv(dev);
 453         scc_t __iomem *sccp = fep->scc.sccp;
 454
 455         S16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
 456 }
 457
 458 static void napi_disable_rx(struct net_device *dev)
 459 {
 460         struct fs_enet_private *fep = netdev_priv(dev);
 461         scc_t __iomem *sccp = fep->scc.sccp;
 462
 463         C16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
 464 }
 465
 466 static void rx_bd_done(struct net_device *dev)
 467 {
 468         /* nothing */
 469 }
 470
 471 static void tx_kickstart(struct net_device *dev)
 472 {
 473         /* nothing */
 474 }
 475
 476 static u32 get_int_events(struct net_device *dev)
 477 {
 478         struct fs_enet_private *fep = netdev_priv(dev);
 479         scc_t __iomem *sccp = fep->scc.sccp;
 480
 481         return (u32) R16(sccp, scc_scce);
 482 }
 483
 484 static void clear_int_events(struct net_device *dev, u32 int_events)
 485 {
 486         struct fs_enet_private *fep = netdev_priv(dev);
 487         scc_t __iomem *sccp = fep->scc.sccp;
 488
 489         W16(sccp, scc_scce, int_events & 0xffff);
 490 }
 491
 492 static void ev_error(struct net_device *dev, u32 int_events)
 493 {
 494         printk(KERN_WARNING DRV_MODULE_NAME
 495                ": %s SCC ERROR(s) 0x%x\n", dev->name, int_events);
 496 }
 497
 498 static int get_regs(struct net_device *dev, void *p, int *sizep)
 499 {
 500         struct fs_enet_private *fep = netdev_priv(dev);
 501
 502         if (*sizep < sizeof(scc_t) + sizeof(scc_enet_t __iomem *))
 503                 return -EINVAL;
 504
 505         memcpy_fromio(p, fep->scc.sccp, sizeof(scc_t));
 506         p = (char *)p + sizeof(scc_t);
 507
 508         memcpy_fromio(p, fep->scc.ep, sizeof(scc_enet_t __iomem *));
 509
 510         return 0;
 511 }
 512
 513 static int get_regs_len(struct net_device *dev)
 514 {
 515         return sizeof(scc_t) + sizeof(scc_enet_t __iomem *);
 516 }
 517
 518 static void tx_restart(struct net_device *dev)
 519 {
 520         struct fs_enet_private *fep = netdev_priv(dev);
 521
 522         scc_cr_cmd(fep, CPM_CR_RESTART_TX);
 523 }
 524
 525
 526
 527 /*************************************************************************/
 528
 529 const struct fs_ops fs_scc_ops = {
 530         .setup_data             = setup_data,
 531         .cleanup_data           = cleanup_data,
 532         .set_multicast_list     = set_multicast_list,
 533         .restart                = restart,
 534         .stop                   = stop,
 535         .pre_request_irq        = pre_request_irq,
 536         .post_free_irq          = post_free_irq,
 537         .napi_clear_rx_event    = napi_clear_rx_event,
 538         .napi_enable_rx         = napi_enable_rx,
 539         .napi_disable_rx        = napi_disable_rx,
 540         .rx_bd_done             = rx_bd_done,
 541         .tx_kickstart           = tx_kickstart,
 542         .get_int_events         = get_int_events,
 543         .clear_int_events       = clear_int_events,
 544         .ev_error               = ev_error,
 545         .get_regs               = get_regs,
 546         .get_regs_len           = get_regs_len,
 547         .tx_restart             = tx_restart,
 548         .allocate_bd            = allocate_bd,
 549         .free_bd                = free_bd,
 550 };