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/config.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19 #include <linux/sched.h>
  20 #include <linux/string.h>
  21 #include <linux/ptrace.h>
  22 #include <linux/errno.h>
  23 #include <linux/ioport.h>
  24 #include <linux/slab.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/pci.h>
  27 #include <linux/init.h>
  28 #include <linux/delay.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/mii.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/bitops.h>
  36 #include <linux/fs.h>
  37 #include <linux/platform_device.h>
  38
  39 #include <asm/irq.h>
  40 #include <asm/uaccess.h>
  41
  42 #ifdef CONFIG_8xx
  43 #include <asm/8xx_immap.h>
  44 #include <asm/pgtable.h>
  45 #include <asm/mpc8xx.h>
  46 #include <asm/commproc.h>
  47 #endif
  48
  49 #include "fs_enet.h"
  50
  51 /*************************************************/
  52
  53 #if defined(CONFIG_CPM1)
  54 /* for a 8xx __raw_xxx's are sufficient */
  55 #define __fs_out32(addr, x)     __raw_writel(x, addr)
  56 #define __fs_out16(addr, x)     __raw_writew(x, addr)
  57 #define __fs_out8(addr, x)      __raw_writeb(x, addr)
  58 #define __fs_in32(addr) __raw_readl(addr)
  59 #define __fs_in16(addr) __raw_readw(addr)
  60 #define __fs_in8(addr)  __raw_readb(addr)
  61 #else
  62 /* for others play it safe */
  63 #define __fs_out32(addr, x)     out_be32(addr, x)
  64 #define __fs_out16(addr, x)     out_be16(addr, x)
  65 #define __fs_in32(addr) in_be32(addr)
  66 #define __fs_in16(addr) in_be16(addr)
  67 #endif
  68
  69 /* write, read, set bits, clear bits */
  70 #define W32(_p, _m, _v) __fs_out32(&(_p)->_m, (_v))
  71 #define R32(_p, _m)     __fs_in32(&(_p)->_m)
  72 #define S32(_p, _m, _v) W32(_p, _m, R32(_p, _m) | (_v))
  73 #define C32(_p, _m, _v) W32(_p, _m, R32(_p, _m) & ~(_v))
  74
  75 #define W16(_p, _m, _v) __fs_out16(&(_p)->_m, (_v))
  76 #define R16(_p, _m)     __fs_in16(&(_p)->_m)
  77 #define S16(_p, _m, _v) W16(_p, _m, R16(_p, _m) | (_v))
  78 #define C16(_p, _m, _v) W16(_p, _m, R16(_p, _m) & ~(_v))
  79
  80 #define W8(_p, _m, _v)  __fs_out8(&(_p)->_m, (_v))
  81 #define R8(_p, _m)      __fs_in8(&(_p)->_m)
  82 #define S8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) | (_v))
  83 #define C8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) & ~(_v))
  84
  85 #define SCC_MAX_MULTICAST_ADDRS 64
  86
  87 /*
  88  * Delay to wait for SCC reset command to complete (in us)
  89  */
  90 #define SCC_RESET_DELAY         50
  91 #define MAX_CR_CMD_LOOPS        10000
  92
  93 static inline int scc_cr_cmd(struct fs_enet_private *fep, u32 op)
  94 {
  95         cpm8xx_t *cpmp = &((immap_t *)fs_enet_immap)->im_cpm;
  96         u32 v, ch;
  97         int i = 0;
  98
  99         ch = fep->scc.idx << 2;
 100         v = mk_cr_cmd(ch, op);
 101         W16(cpmp, cp_cpcr, v | CPM_CR_FLG);
 102         for (i = 0; i < MAX_CR_CMD_LOOPS; i++)
 103                 if ((R16(cpmp, cp_cpcr) & CPM_CR_FLG) == 0)
 104                         break;
 105
 106         if (i >= MAX_CR_CMD_LOOPS) {
 107                 printk(KERN_ERR "%s(): Not able to issue CPM command\n",
 108                         __FUNCTION__);
 109                 return 1;
 110         }
 111         return 0;
 112 }
 113
 114 static int do_pd_setup(struct fs_enet_private *fep)
 115 {
 116         struct platform_device *pdev = to_platform_device(fep->dev);
 117         struct resource *r;
 118
 119         /* Fill out IRQ field */
 120         fep->interrupt = platform_get_irq_byname(pdev, "interrupt");
 121         if (fep->interrupt < 0)
 122                 return -EINVAL;
 123
 124         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 125         fep->scc.sccp = (void *)r->start;
 126
 127         if (fep->scc.sccp == NULL)
 128                 return -EINVAL;
 129
 130         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pram");
 131         fep->scc.ep = (void *)r->start;
 132
 133         if (fep->scc.ep == NULL)
 134                 return -EINVAL;
 135
 136         return 0;
 137 }
 138
 139 #define SCC_NAPI_RX_EVENT_MSK   (SCCE_ENET_RXF | SCCE_ENET_RXB)
 140 #define SCC_RX_EVENT            (SCCE_ENET_RXF)
 141 #define SCC_TX_EVENT            (SCCE_ENET_TXB)
 142 #define SCC_ERR_EVENT_MSK       (SCCE_ENET_TXE | SCCE_ENET_BSY)
 143
 144 static int setup_data(struct net_device *dev)
 145 {
 146         struct fs_enet_private *fep = netdev_priv(dev);
 147         const struct fs_platform_info *fpi = fep->fpi;
 148
 149         fep->scc.idx = fs_get_scc_index(fpi->fs_no);
 150         if ((unsigned int)fep->fcc.idx > 4)     /* max 4 SCCs */
 151                 return -EINVAL;
 152
 153         do_pd_setup(fep);
 154
 155         fep->scc.hthi = 0;
 156         fep->scc.htlo = 0;
 157
 158         fep->ev_napi_rx = SCC_NAPI_RX_EVENT_MSK;
 159         fep->ev_rx = SCC_RX_EVENT;
 160         fep->ev_tx = SCC_TX_EVENT;
 161         fep->ev_err = SCC_ERR_EVENT_MSK;
 162
 163         return 0;
 164 }
 165
 166 static int allocate_bd(struct net_device *dev)
 167 {
 168         struct fs_enet_private *fep = netdev_priv(dev);
 169         const struct fs_platform_info *fpi = fep->fpi;
 170
 171         fep->ring_mem_addr = cpm_dpalloc((fpi->tx_ring + fpi->rx_ring) *
 172                                          sizeof(cbd_t), 8);
 173         if (IS_DPERR(fep->ring_mem_addr))
 174                 return -ENOMEM;
 175
 176         fep->ring_base = cpm_dpram_addr(fep->ring_mem_addr);
 177
 178         return 0;
 179 }
 180
 181 static void free_bd(struct net_device *dev)
 182 {
 183         struct fs_enet_private *fep = netdev_priv(dev);
 184
 185         if (fep->ring_base)
 186                 cpm_dpfree(fep->ring_mem_addr);
 187 }
 188
 189 static void cleanup_data(struct net_device *dev)
 190 {
 191         /* nothing */
 192 }
 193
 194 static void set_promiscuous_mode(struct net_device *dev)
 195 {
 196         struct fs_enet_private *fep = netdev_priv(dev);
 197         scc_t *sccp = fep->scc.sccp;
 198
 199         S16(sccp, scc_psmr, SCC_PSMR_PRO);
 200 }
 201
 202 static void set_multicast_start(struct net_device *dev)
 203 {
 204         struct fs_enet_private *fep = netdev_priv(dev);
 205         scc_enet_t *ep = fep->scc.ep;
 206
 207         W16(ep, sen_gaddr1, 0);
 208         W16(ep, sen_gaddr2, 0);
 209         W16(ep, sen_gaddr3, 0);
 210         W16(ep, sen_gaddr4, 0);
 211 }
 212
 213 static void set_multicast_one(struct net_device *dev, const u8 * mac)
 214 {
 215         struct fs_enet_private *fep = netdev_priv(dev);
 216         scc_enet_t *ep = fep->scc.ep;
 217         u16 taddrh, taddrm, taddrl;
 218
 219         taddrh = ((u16) mac[5] << 8) | mac[4];
 220         taddrm = ((u16) mac[3] << 8) | mac[2];
 221         taddrl = ((u16) mac[1] << 8) | mac[0];
 222
 223         W16(ep, sen_taddrh, taddrh);
 224         W16(ep, sen_taddrm, taddrm);
 225         W16(ep, sen_taddrl, taddrl);
 226         scc_cr_cmd(fep, CPM_CR_SET_GADDR);
 227 }
 228
 229 static void set_multicast_finish(struct net_device *dev)
 230 {
 231         struct fs_enet_private *fep = netdev_priv(dev);
 232         scc_t *sccp = fep->scc.sccp;
 233         scc_enet_t *ep = fep->scc.ep;
 234
 235         /* clear promiscuous always */
 236         C16(sccp, scc_psmr, SCC_PSMR_PRO);
 237
 238         /* if all multi or too many multicasts; just enable all */
 239         if ((dev->flags & IFF_ALLMULTI) != 0 ||
 240             dev->mc_count > SCC_MAX_MULTICAST_ADDRS) {
 241
 242                 W16(ep, sen_gaddr1, 0xffff);
 243                 W16(ep, sen_gaddr2, 0xffff);
 244                 W16(ep, sen_gaddr3, 0xffff);
 245                 W16(ep, sen_gaddr4, 0xffff);
 246         }
 247 }
 248
 249 static void set_multicast_list(struct net_device *dev)
 250 {
 251         struct dev_mc_list *pmc;
 252
 253         if ((dev->flags & IFF_PROMISC) == 0) {
 254                 set_multicast_start(dev);
 255                 for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next)
 256                         set_multicast_one(dev, pmc->dmi_addr);
 257                 set_multicast_finish(dev);
 258         } else
 259                 set_promiscuous_mode(dev);
 260 }
 261
 262 /*
 263  * This function is called to start or restart the FEC during a link
 264  * change.  This only happens when switching between half and full
 265  * duplex.
 266  */
 267 static void restart(struct net_device *dev)
 268 {
 269         struct fs_enet_private *fep = netdev_priv(dev);
 270         scc_t *sccp = fep->scc.sccp;
 271         scc_enet_t *ep = fep->scc.ep;
 272         const struct fs_platform_info *fpi = fep->fpi;
 273         u16 paddrh, paddrm, paddrl;
 274         const unsigned char *mac;
 275         int i;
 276
 277         C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 278
 279         /* clear everything (slow & steady does it) */
 280         for (i = 0; i < sizeof(*ep); i++)
 281                 __fs_out8((char *)ep + i, 0);
 282
 283         /* point to bds */
 284         W16(ep, sen_genscc.scc_rbase, fep->ring_mem_addr);
 285         W16(ep, sen_genscc.scc_tbase,
 286             fep->ring_mem_addr + sizeof(cbd_t) * fpi->rx_ring);
 287
 288         /* Initialize function code registers for big-endian.
 289          */
 290         W8(ep, sen_genscc.scc_rfcr, SCC_EB);
 291         W8(ep, sen_genscc.scc_tfcr, SCC_EB);
 292
 293         /* Set maximum bytes per receive buffer.
 294          * This appears to be an Ethernet frame size, not the buffer
 295          * fragment size.  It must be a multiple of four.
 296          */
 297         W16(ep, sen_genscc.scc_mrblr, 0x5f0);
 298
 299         /* Set CRC preset and mask.
 300          */
 301         W32(ep, sen_cpres, 0xffffffff);
 302         W32(ep, sen_cmask, 0xdebb20e3);
 303
 304         W32(ep, sen_crcec, 0);  /* CRC Error counter */
 305         W32(ep, sen_alec, 0);   /* alignment error counter */
 306         W32(ep, sen_disfc, 0);  /* discard frame counter */
 307
 308         W16(ep, sen_pads, 0x8888);      /* Tx short frame pad character */
 309         W16(ep, sen_retlim, 15);        /* Retry limit threshold */
 310
 311         W16(ep, sen_maxflr, 0x5ee);     /* maximum frame length register */
 312
 313         W16(ep, sen_minflr, PKT_MINBUF_SIZE);   /* minimum frame length register */
 314
 315         W16(ep, sen_maxd1, 0x000005f0); /* maximum DMA1 length */
 316         W16(ep, sen_maxd2, 0x000005f0); /* maximum DMA2 length */
 317
 318         /* Clear hash tables.
 319          */
 320         W16(ep, sen_gaddr1, 0);
 321         W16(ep, sen_gaddr2, 0);
 322         W16(ep, sen_gaddr3, 0);
 323         W16(ep, sen_gaddr4, 0);
 324         W16(ep, sen_iaddr1, 0);
 325         W16(ep, sen_iaddr2, 0);
 326         W16(ep, sen_iaddr3, 0);
 327         W16(ep, sen_iaddr4, 0);
 328
 329         /* set address
 330          */
 331         mac = dev->dev_addr;
 332         paddrh = ((u16) mac[5] << 8) | mac[4];
 333         paddrm = ((u16) mac[3] << 8) | mac[2];
 334         paddrl = ((u16) mac[1] << 8) | mac[0];
 335
 336         W16(ep, sen_paddrh, paddrh);
 337         W16(ep, sen_paddrm, paddrm);
 338         W16(ep, sen_paddrl, paddrl);
 339
 340         W16(ep, sen_pper, 0);
 341         W16(ep, sen_taddrl, 0);
 342         W16(ep, sen_taddrm, 0);
 343         W16(ep, sen_taddrh, 0);
 344
 345         fs_init_bds(dev);
 346
 347         scc_cr_cmd(fep, CPM_CR_INIT_TRX);
 348
 349         W16(sccp, scc_scce, 0xffff);
 350
 351         /* Enable interrupts we wish to service.
 352          */
 353         W16(sccp, scc_sccm, SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
 354
 355         /* Set GSMR_H to enable all normal operating modes.
 356          * Set GSMR_L to enable Ethernet to MC68160.
 357          */
 358         W32(sccp, scc_gsmrh, 0);
 359         W32(sccp, scc_gsmrl,
 360             SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 |
 361             SCC_GSMRL_MODE_ENET);
 362
 363         /* Set sync/delimiters.
 364          */
 365         W16(sccp, scc_dsr, 0xd555);
 366
 367         /* Set processing mode.  Use Ethernet CRC, catch broadcast, and
 368          * start frame search 22 bit times after RENA.
 369          */
 370         W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
 371
 372         /* Set full duplex mode if needed */
 373         if (fep->duplex)
 374                 S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);
 375
 376         S32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 377 }
 378
 379 static void stop(struct net_device *dev)
 380 {
 381         struct fs_enet_private *fep = netdev_priv(dev);
 382         scc_t *sccp = fep->scc.sccp;
 383         int i;
 384
 385         for (i = 0; (R16(sccp, scc_sccm) == 0) && i < SCC_RESET_DELAY; i++)
 386                 udelay(1);
 387
 388         if (i == SCC_RESET_DELAY)
 389                 printk(KERN_WARNING DRV_MODULE_NAME
 390                        ": %s SCC timeout on graceful transmit stop\n",
 391                        dev->name);
 392
 393         W16(sccp, scc_sccm, 0);
 394         C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 395
 396         fs_cleanup_bds(dev);
 397 }
 398
 399 static void pre_request_irq(struct net_device *dev, int irq)
 400 {
 401         immap_t *immap = fs_enet_immap;
 402         u32 siel;
 403
 404         /* SIU interrupt */
 405         if (irq >= SIU_IRQ0 && irq < SIU_LEVEL7) {
 406
 407                 siel = in_be32(&immap->im_siu_conf.sc_siel);
 408                 if ((irq & 1) == 0)
 409                         siel |= (0x80000000 >> irq);
 410                 else
 411                         siel &= ~(0x80000000 >> (irq & ~1));
 412                 out_be32(&immap->im_siu_conf.sc_siel, siel);
 413         }
 414 }
 415
 416 static void post_free_irq(struct net_device *dev, int irq)
 417 {
 418         /* nothing */
 419 }
 420
 421 static void napi_clear_rx_event(struct net_device *dev)
 422 {
 423         struct fs_enet_private *fep = netdev_priv(dev);
 424         scc_t *sccp = fep->scc.sccp;
 425
 426         W16(sccp, scc_scce, SCC_NAPI_RX_EVENT_MSK);
 427 }
 428
 429 static void napi_enable_rx(struct net_device *dev)
 430 {
 431         struct fs_enet_private *fep = netdev_priv(dev);
 432         scc_t *sccp = fep->scc.sccp;
 433
 434         S16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
 435 }
 436
 437 static void napi_disable_rx(struct net_device *dev)
 438 {
 439         struct fs_enet_private *fep = netdev_priv(dev);
 440         scc_t *sccp = fep->scc.sccp;
 441
 442         C16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
 443 }
 444
 445 static void rx_bd_done(struct net_device *dev)
 446 {
 447         /* nothing */
 448 }
 449
 450 static void tx_kickstart(struct net_device *dev)
 451 {
 452         /* nothing */
 453 }
 454
 455 static u32 get_int_events(struct net_device *dev)
 456 {
 457         struct fs_enet_private *fep = netdev_priv(dev);
 458         scc_t *sccp = fep->scc.sccp;
 459
 460         return (u32) R16(sccp, scc_scce);
 461 }
 462
 463 static void clear_int_events(struct net_device *dev, u32 int_events)
 464 {
 465         struct fs_enet_private *fep = netdev_priv(dev);
 466         scc_t *sccp = fep->scc.sccp;
 467
 468         W16(sccp, scc_scce, int_events & 0xffff);
 469 }
 470
 471 static void ev_error(struct net_device *dev, u32 int_events)
 472 {
 473         printk(KERN_WARNING DRV_MODULE_NAME
 474                ": %s SCC ERROR(s) 0x%x\n", dev->name, int_events);
 475 }
 476
 477 static int get_regs(struct net_device *dev, void *p, int *sizep)
 478 {
 479         struct fs_enet_private *fep = netdev_priv(dev);
 480
 481         if (*sizep < sizeof(scc_t) + sizeof(scc_enet_t))
 482                 return -EINVAL;
 483
 484         memcpy_fromio(p, fep->scc.sccp, sizeof(scc_t));
 485         p = (char *)p + sizeof(scc_t);
 486
 487         memcpy_fromio(p, fep->scc.ep, sizeof(scc_enet_t));
 488
 489         return 0;
 490 }
 491
 492 static int get_regs_len(struct net_device *dev)
 493 {
 494         return sizeof(scc_t) + sizeof(scc_enet_t);
 495 }
 496
 497 static void tx_restart(struct net_device *dev)
 498 {
 499         struct fs_enet_private *fep = netdev_priv(dev);
 500
 501         scc_cr_cmd(fep, CPM_CR_RESTART_TX);
 502 }
 503
 504 /*************************************************************************/
 505
 506 const struct fs_ops fs_scc_ops = {
 507         .setup_data             = setup_data,
 508         .cleanup_data           = cleanup_data,
 509         .set_multicast_list     = set_multicast_list,
 510         .restart                = restart,
 511         .stop                   = stop,
 512         .pre_request_irq        = pre_request_irq,
 513         .post_free_irq          = post_free_irq,
 514         .napi_clear_rx_event    = napi_clear_rx_event,
 515         .napi_enable_rx         = napi_enable_rx,
 516         .napi_disable_rx        = napi_disable_rx,
 517         .rx_bd_done             = rx_bd_done,
 518         .tx_kickstart           = tx_kickstart,
 519         .get_int_events         = get_int_events,
 520         .clear_int_events       = clear_int_events,
 521         .ev_error               = ev_error,
 522         .get_regs               = get_regs,
 523         .get_regs_len           = get_regs_len,
 524         .tx_restart             = tx_restart,
 525         .allocate_bd            = allocate_bd,
 526         .free_bd                = free_bd,
 527 };