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 #include <linux/of_platform.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
  49 /*************************************************/
  50 #if defined(CONFIG_CPM1)
  51 /* for a 8xx __raw_xxx's are sufficient */
  52 #define __fs_out32(addr, x)     __raw_writel(x, addr)
  53 #define __fs_out16(addr, x)     __raw_writew(x, addr)
  54 #define __fs_out8(addr, x)      __raw_writeb(x, addr)
  55 #define __fs_in32(addr) __raw_readl(addr)
  56 #define __fs_in16(addr) __raw_readw(addr)
  57 #define __fs_in8(addr)  __raw_readb(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 #define __fs_out8(addr, x)      out_8(addr, x)
  65 #define __fs_in8(addr)  in_8(addr)
  66 #endif
  67
  68 /* write, read, set bits, clear bits */
  69 #define W32(_p, _m, _v) __fs_out32(&(_p)->_m, (_v))
  70 #define R32(_p, _m)     __fs_in32(&(_p)->_m)
  71 #define S32(_p, _m, _v) W32(_p, _m, R32(_p, _m) | (_v))
  72 #define C32(_p, _m, _v) W32(_p, _m, R32(_p, _m) & ~(_v))
  73
  74 #define W16(_p, _m, _v) __fs_out16(&(_p)->_m, (_v))
  75 #define R16(_p, _m)     __fs_in16(&(_p)->_m)
  76 #define S16(_p, _m, _v) W16(_p, _m, R16(_p, _m) | (_v))
  77 #define C16(_p, _m, _v) W16(_p, _m, R16(_p, _m) & ~(_v))
  78
  79 #define W8(_p, _m, _v)  __fs_out8(&(_p)->_m, (_v))
  80 #define R8(_p, _m)      __fs_in8(&(_p)->_m)
  81 #define S8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) | (_v))
  82 #define C8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) & ~(_v))
  83
  84 #define SCC_MAX_MULTICAST_ADDRS 64
  85
  86 /*
  87  * Delay to wait for SCC reset command to complete (in us)
  88  */
  89 #define SCC_RESET_DELAY         50
  90
  91 static inline int scc_cr_cmd(struct fs_enet_private *fep, u32 op)
  92 {
  93         const struct fs_platform_info *fpi = fep->fpi;
  94
  95         return cpm_command(fpi->cp_command, op);
  96 }
  97
  98 static int do_pd_setup(struct fs_enet_private *fep)
  99 {
 100         struct of_device *ofdev = to_of_device(fep->dev);
 101
 102         fep->interrupt = of_irq_to_resource(ofdev->node, 0, NULL);
 103         if (fep->interrupt == NO_IRQ)
 104                 return -EINVAL;
 105
 106         fep->scc.sccp = of_iomap(ofdev->node, 0);
 107         if (!fep->scc.sccp)
 108                 return -EINVAL;
 109
 110         fep->scc.ep = of_iomap(ofdev->node, 1);
 111         if (!fep->scc.ep) {
 112                 iounmap(fep->scc.sccp);
 113                 return -EINVAL;
 114         }
 115
 116         return 0;
 117 }
 118
 119 #define SCC_NAPI_RX_EVENT_MSK   (SCCE_ENET_RXF | SCCE_ENET_RXB)
 120 #define SCC_RX_EVENT            (SCCE_ENET_RXF)
 121 #define SCC_TX_EVENT            (SCCE_ENET_TXB)
 122 #define SCC_ERR_EVENT_MSK       (SCCE_ENET_TXE | SCCE_ENET_BSY)
 123
 124 static int setup_data(struct net_device *dev)
 125 {
 126         struct fs_enet_private *fep = netdev_priv(dev);
 127
 128         do_pd_setup(fep);
 129
 130         fep->scc.hthi = 0;
 131         fep->scc.htlo = 0;
 132
 133         fep->ev_napi_rx = SCC_NAPI_RX_EVENT_MSK;
 134         fep->ev_rx = SCC_RX_EVENT;
 135         fep->ev_tx = SCC_TX_EVENT | SCCE_ENET_TXE;
 136         fep->ev_err = SCC_ERR_EVENT_MSK;
 137
 138         return 0;
 139 }
 140
 141 static int allocate_bd(struct net_device *dev)
 142 {
 143         struct fs_enet_private *fep = netdev_priv(dev);
 144         const struct fs_platform_info *fpi = fep->fpi;
 145
 146         fep->ring_mem_addr = cpm_dpalloc((fpi->tx_ring + fpi->rx_ring) *
 147                                          sizeof(cbd_t), 8);
 148         if (IS_ERR_VALUE(fep->ring_mem_addr))
 149                 return -ENOMEM;
 150
 151         fep->ring_base = (void __iomem __force*)
 152                 cpm_dpram_addr(fep->ring_mem_addr);
 153
 154         return 0;
 155 }
 156
 157 static void free_bd(struct net_device *dev)
 158 {
 159         struct fs_enet_private *fep = netdev_priv(dev);
 160
 161         if (fep->ring_base)
 162                 cpm_dpfree(fep->ring_mem_addr);
 163 }
 164
 165 static void cleanup_data(struct net_device *dev)
 166 {
 167         /* nothing */
 168 }
 169
 170 static void set_promiscuous_mode(struct net_device *dev)
 171 {
 172         struct fs_enet_private *fep = netdev_priv(dev);
 173         scc_t __iomem *sccp = fep->scc.sccp;
 174
 175         S16(sccp, scc_psmr, SCC_PSMR_PRO);
 176 }
 177
 178 static void set_multicast_start(struct net_device *dev)
 179 {
 180         struct fs_enet_private *fep = netdev_priv(dev);
 181         scc_enet_t __iomem *ep = fep->scc.ep;
 182
 183         W16(ep, sen_gaddr1, 0);
 184         W16(ep, sen_gaddr2, 0);
 185         W16(ep, sen_gaddr3, 0);
 186         W16(ep, sen_gaddr4, 0);
 187 }
 188
 189 static void set_multicast_one(struct net_device *dev, const u8 * mac)
 190 {
 191         struct fs_enet_private *fep = netdev_priv(dev);
 192         scc_enet_t __iomem *ep = fep->scc.ep;
 193         u16 taddrh, taddrm, taddrl;
 194
 195         taddrh = ((u16) mac[5] << 8) | mac[4];
 196         taddrm = ((u16) mac[3] << 8) | mac[2];
 197         taddrl = ((u16) mac[1] << 8) | mac[0];
 198
 199         W16(ep, sen_taddrh, taddrh);
 200         W16(ep, sen_taddrm, taddrm);
 201         W16(ep, sen_taddrl, taddrl);
 202         scc_cr_cmd(fep, CPM_CR_SET_GADDR);
 203 }
 204
 205 static void set_multicast_finish(struct net_device *dev)
 206 {
 207         struct fs_enet_private *fep = netdev_priv(dev);
 208         scc_t __iomem *sccp = fep->scc.sccp;
 209         scc_enet_t __iomem *ep = fep->scc.ep;
 210
 211         /* clear promiscuous always */
 212         C16(sccp, scc_psmr, SCC_PSMR_PRO);
 213
 214         /* if all multi or too many multicasts; just enable all */
 215         if ((dev->flags & IFF_ALLMULTI) != 0 ||
 216             netdev_mc_count(dev) > SCC_MAX_MULTICAST_ADDRS) {
 217
 218                 W16(ep, sen_gaddr1, 0xffff);
 219                 W16(ep, sen_gaddr2, 0xffff);
 220                 W16(ep, sen_gaddr3, 0xffff);
 221                 W16(ep, sen_gaddr4, 0xffff);
 222         }
 223 }
 224
 225 static void set_multicast_list(struct net_device *dev)
 226 {
 227         struct dev_mc_list *pmc;
 228
 229         if ((dev->flags & IFF_PROMISC) == 0) {
 230                 set_multicast_start(dev);
 231                 netdev_for_each_mc_addr(pmc, dev)
 232                         set_multicast_one(dev, pmc->dmi_addr);
 233                 set_multicast_finish(dev);
 234         } else
 235                 set_promiscuous_mode(dev);
 236 }
 237
 238 /*
 239  * This function is called to start or restart the FEC during a link
 240  * change.  This only happens when switching between half and full
 241  * duplex.
 242  */
 243 static void restart(struct net_device *dev)
 244 {
 245         struct fs_enet_private *fep = netdev_priv(dev);
 246         scc_t __iomem *sccp = fep->scc.sccp;
 247         scc_enet_t __iomem *ep = fep->scc.ep;
 248         const struct fs_platform_info *fpi = fep->fpi;
 249         u16 paddrh, paddrm, paddrl;
 250         const unsigned char *mac;
 251         int i;
 252
 253         C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 254
 255         /* clear everything (slow & steady does it) */
 256         for (i = 0; i < sizeof(*ep); i++)
 257                 __fs_out8((u8 __iomem *)ep + i, 0);
 258
 259         /* point to bds */
 260         W16(ep, sen_genscc.scc_rbase, fep->ring_mem_addr);
 261         W16(ep, sen_genscc.scc_tbase,
 262             fep->ring_mem_addr + sizeof(cbd_t) * fpi->rx_ring);
 263
 264         /* Initialize function code registers for big-endian.
 265          */
 266 #ifndef CONFIG_NOT_COHERENT_CACHE
 267         W8(ep, sen_genscc.scc_rfcr, SCC_EB | SCC_GBL);
 268         W8(ep, sen_genscc.scc_tfcr, SCC_EB | SCC_GBL);
 269 #else
 270         W8(ep, sen_genscc.scc_rfcr, SCC_EB);
 271         W8(ep, sen_genscc.scc_tfcr, SCC_EB);
 272 #endif
 273
 274         /* Set maximum bytes per receive buffer.
 275          * This appears to be an Ethernet frame size, not the buffer
 276          * fragment size.  It must be a multiple of four.
 277          */
 278         W16(ep, sen_genscc.scc_mrblr, 0x5f0);
 279
 280         /* Set CRC preset and mask.
 281          */
 282         W32(ep, sen_cpres, 0xffffffff);
 283         W32(ep, sen_cmask, 0xdebb20e3);
 284
 285         W32(ep, sen_crcec, 0);  /* CRC Error counter */
 286         W32(ep, sen_alec, 0);   /* alignment error counter */
 287         W32(ep, sen_disfc, 0);  /* discard frame counter */
 288
 289         W16(ep, sen_pads, 0x8888);      /* Tx short frame pad character */
 290         W16(ep, sen_retlim, 15);        /* Retry limit threshold */
 291
 292         W16(ep, sen_maxflr, 0x5ee);     /* maximum frame length register */
 293
 294         W16(ep, sen_minflr, PKT_MINBUF_SIZE);   /* minimum frame length register */
 295
 296         W16(ep, sen_maxd1, 0x000005f0); /* maximum DMA1 length */
 297         W16(ep, sen_maxd2, 0x000005f0); /* maximum DMA2 length */
 298
 299         /* Clear hash tables.
 300          */
 301         W16(ep, sen_gaddr1, 0);
 302         W16(ep, sen_gaddr2, 0);
 303         W16(ep, sen_gaddr3, 0);
 304         W16(ep, sen_gaddr4, 0);
 305         W16(ep, sen_iaddr1, 0);
 306         W16(ep, sen_iaddr2, 0);
 307         W16(ep, sen_iaddr3, 0);
 308         W16(ep, sen_iaddr4, 0);
 309
 310         /* set address
 311          */
 312         mac = dev->dev_addr;
 313         paddrh = ((u16) mac[5] << 8) | mac[4];
 314         paddrm = ((u16) mac[3] << 8) | mac[2];
 315         paddrl = ((u16) mac[1] << 8) | mac[0];
 316
 317         W16(ep, sen_paddrh, paddrh);
 318         W16(ep, sen_paddrm, paddrm);
 319         W16(ep, sen_paddrl, paddrl);
 320
 321         W16(ep, sen_pper, 0);
 322         W16(ep, sen_taddrl, 0);
 323         W16(ep, sen_taddrm, 0);
 324         W16(ep, sen_taddrh, 0);
 325
 326         fs_init_bds(dev);
 327
 328         scc_cr_cmd(fep, CPM_CR_INIT_TRX);
 329
 330         W16(sccp, scc_scce, 0xffff);
 331
 332         /* Enable interrupts we wish to service.
 333          */
 334         W16(sccp, scc_sccm, SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
 335
 336         /* Set GSMR_H to enable all normal operating modes.
 337          * Set GSMR_L to enable Ethernet to MC68160.
 338          */
 339         W32(sccp, scc_gsmrh, 0);
 340         W32(sccp, scc_gsmrl,
 341             SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 |
 342             SCC_GSMRL_MODE_ENET);
 343
 344         /* Set sync/delimiters.
 345          */
 346         W16(sccp, scc_dsr, 0xd555);
 347
 348         /* Set processing mode.  Use Ethernet CRC, catch broadcast, and
 349          * start frame search 22 bit times after RENA.
 350          */
 351         W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
 352
 353         /* Set full duplex mode if needed */
 354         if (fep->phydev->duplex)
 355                 S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);
 356
 357         S32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 358 }
 359
 360 static void stop(struct net_device *dev)
 361 {
 362         struct fs_enet_private *fep = netdev_priv(dev);
 363         scc_t __iomem *sccp = fep->scc.sccp;
 364         int i;
 365
 366         for (i = 0; (R16(sccp, scc_sccm) == 0) && i < SCC_RESET_DELAY; i++)
 367                 udelay(1);
 368
 369         if (i == SCC_RESET_DELAY)
 370                 dev_warn(fep->dev, "SCC timeout on graceful transmit stop\n");
 371
 372         W16(sccp, scc_sccm, 0);
 373         C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 374
 375         fs_cleanup_bds(dev);
 376 }
 377
 378 static void napi_clear_rx_event(struct net_device *dev)
 379 {
 380         struct fs_enet_private *fep = netdev_priv(dev);
 381         scc_t __iomem *sccp = fep->scc.sccp;
 382
 383         W16(sccp, scc_scce, SCC_NAPI_RX_EVENT_MSK);
 384 }
 385
 386 static void napi_enable_rx(struct net_device *dev)
 387 {
 388         struct fs_enet_private *fep = netdev_priv(dev);
 389         scc_t __iomem *sccp = fep->scc.sccp;
 390
 391         S16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
 392 }
 393
 394 static void napi_disable_rx(struct net_device *dev)
 395 {
 396         struct fs_enet_private *fep = netdev_priv(dev);
 397         scc_t __iomem *sccp = fep->scc.sccp;
 398
 399         C16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
 400 }
 401
 402 static void rx_bd_done(struct net_device *dev)
 403 {
 404         /* nothing */
 405 }
 406
 407 static void tx_kickstart(struct net_device *dev)
 408 {
 409         /* nothing */
 410 }
 411
 412 static u32 get_int_events(struct net_device *dev)
 413 {
 414         struct fs_enet_private *fep = netdev_priv(dev);
 415         scc_t __iomem *sccp = fep->scc.sccp;
 416
 417         return (u32) R16(sccp, scc_scce);
 418 }
 419
 420 static void clear_int_events(struct net_device *dev, u32 int_events)
 421 {
 422         struct fs_enet_private *fep = netdev_priv(dev);
 423         scc_t __iomem *sccp = fep->scc.sccp;
 424
 425         W16(sccp, scc_scce, int_events & 0xffff);
 426 }
 427
 428 static void ev_error(struct net_device *dev, u32 int_events)
 429 {
 430         struct fs_enet_private *fep = netdev_priv(dev);
 431
 432         dev_warn(fep->dev, "SCC ERROR(s) 0x%x\n", int_events);
 433 }
 434
 435 static int get_regs(struct net_device *dev, void *p, int *sizep)
 436 {
 437         struct fs_enet_private *fep = netdev_priv(dev);
 438
 439         if (*sizep < sizeof(scc_t) + sizeof(scc_enet_t __iomem *))
 440                 return -EINVAL;
 441
 442         memcpy_fromio(p, fep->scc.sccp, sizeof(scc_t));
 443         p = (char *)p + sizeof(scc_t);
 444
 445         memcpy_fromio(p, fep->scc.ep, sizeof(scc_enet_t __iomem *));
 446
 447         return 0;
 448 }
 449
 450 static int get_regs_len(struct net_device *dev)
 451 {
 452         return sizeof(scc_t) + sizeof(scc_enet_t __iomem *);
 453 }
 454
 455 static void tx_restart(struct net_device *dev)
 456 {
 457         struct fs_enet_private *fep = netdev_priv(dev);
 458
 459         scc_cr_cmd(fep, CPM_CR_RESTART_TX);
 460 }
 461
 462
 463
 464 /*************************************************************************/
 465
 466 const struct fs_ops fs_scc_ops = {
 467         .setup_data             = setup_data,
 468         .cleanup_data           = cleanup_data,
 469         .set_multicast_list     = set_multicast_list,
 470         .restart                = restart,
 471         .stop                   = stop,
 472         .napi_clear_rx_event    = napi_clear_rx_event,
 473         .napi_enable_rx         = napi_enable_rx,
 474         .napi_disable_rx        = napi_disable_rx,
 475         .rx_bd_done             = rx_bd_done,
 476         .tx_kickstart           = tx_kickstart,
 477         .get_int_events         = get_int_events,
 478         .clear_int_events       = clear_int_events,
 479         .ev_error               = ev_error,
 480         .get_regs               = get_regs,
 481         .get_regs_len           = get_regs_len,
 482         .tx_restart             = tx_restart,
 483         .allocate_bd            = allocate_bd,
 484         .free_bd                = free_bd,
 485 };