linux/drivers/net/ethernet/freescale/fs_enet/mac-fec.c
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   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/delay.h>
  24#include <linux/netdevice.h>
  25#include <linux/etherdevice.h>
  26#include <linux/skbuff.h>
  27#include <linux/spinlock.h>
  28#include <linux/mii.h>
  29#include <linux/ethtool.h>
  30#include <linux/bitops.h>
  31#include <linux/fs.h>
  32#include <linux/platform_device.h>
  33#include <linux/of_address.h>
  34#include <linux/of_device.h>
  35#include <linux/of_irq.h>
  36#include <linux/gfp.h>
  37
  38#include <asm/irq.h>
  39#include <asm/uaccess.h>
  40
  41#ifdef CONFIG_8xx
  42#include <asm/8xx_immap.h>
  43#include <asm/pgtable.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
  83static 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
  97static int do_pd_setup(struct fs_enet_private *fep)
  98{
  99        struct platform_device *ofdev = to_platform_device(fep->dev);
 100
 101        fep->interrupt = irq_of_parse_and_map(ofdev->dev.of_node, 0);
 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_NAPI_TX_EVENT_MSK   (FEC_ENET_TXF | FEC_ENET_TXB)
 114#define FEC_RX_EVENT            (FEC_ENET_RXF)
 115#define FEC_TX_EVENT            (FEC_ENET_TXF)
 116#define FEC_ERR_EVENT_MSK       (FEC_ENET_HBERR | FEC_ENET_BABR | \
 117                                 FEC_ENET_BABT | FEC_ENET_EBERR)
 118
 119static int setup_data(struct net_device *dev)
 120{
 121        struct fs_enet_private *fep = netdev_priv(dev);
 122
 123        if (do_pd_setup(fep) != 0)
 124                return -EINVAL;
 125
 126        fep->fec.hthi = 0;
 127        fep->fec.htlo = 0;
 128
 129        fep->ev_napi_rx = FEC_NAPI_RX_EVENT_MSK;
 130        fep->ev_napi_tx = FEC_NAPI_TX_EVENT_MSK;
 131        fep->ev_rx = FEC_RX_EVENT;
 132        fep->ev_tx = FEC_TX_EVENT;
 133        fep->ev_err = FEC_ERR_EVENT_MSK;
 134
 135        return 0;
 136}
 137
 138static int allocate_bd(struct net_device *dev)
 139{
 140        struct fs_enet_private *fep = netdev_priv(dev);
 141        const struct fs_platform_info *fpi = fep->fpi;
 142
 143        fep->ring_base = (void __force __iomem *)dma_alloc_coherent(fep->dev,
 144                                            (fpi->tx_ring + fpi->rx_ring) *
 145                                            sizeof(cbd_t), &fep->ring_mem_addr,
 146                                            GFP_KERNEL);
 147        if (fep->ring_base == NULL)
 148                return -ENOMEM;
 149
 150        return 0;
 151}
 152
 153static void free_bd(struct net_device *dev)
 154{
 155        struct fs_enet_private *fep = netdev_priv(dev);
 156        const struct fs_platform_info *fpi = fep->fpi;
 157
 158        if(fep->ring_base)
 159                dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring)
 160                                        * sizeof(cbd_t),
 161                                        (void __force *)fep->ring_base,
 162                                        fep->ring_mem_addr);
 163}
 164
 165static void cleanup_data(struct net_device *dev)
 166{
 167        /* nothing */
 168}
 169
 170static void set_promiscuous_mode(struct net_device *dev)
 171{
 172        struct fs_enet_private *fep = netdev_priv(dev);
 173        struct fec __iomem *fecp = fep->fec.fecp;
 174
 175        FS(fecp, r_cntrl, FEC_RCNTRL_PROM);
 176}
 177
 178static void set_multicast_start(struct net_device *dev)
 179{
 180        struct fs_enet_private *fep = netdev_priv(dev);
 181
 182        fep->fec.hthi = 0;
 183        fep->fec.htlo = 0;
 184}
 185
 186static void set_multicast_one(struct net_device *dev, const u8 *mac)
 187{
 188        struct fs_enet_private *fep = netdev_priv(dev);
 189        int temp, hash_index, i, j;
 190        u32 crc, csrVal;
 191        u8 byte, msb;
 192
 193        crc = 0xffffffff;
 194        for (i = 0; i < 6; i++) {
 195                byte = mac[i];
 196                for (j = 0; j < 8; j++) {
 197                        msb = crc >> 31;
 198                        crc <<= 1;
 199                        if (msb ^ (byte & 0x1))
 200                                crc ^= FEC_CRC_POLY;
 201                        byte >>= 1;
 202                }
 203        }
 204
 205        temp = (crc & 0x3f) >> 1;
 206        hash_index = ((temp & 0x01) << 4) |
 207                     ((temp & 0x02) << 2) |
 208                     ((temp & 0x04)) |
 209                     ((temp & 0x08) >> 2) |
 210                     ((temp & 0x10) >> 4);
 211        csrVal = 1 << hash_index;
 212        if (crc & 1)
 213                fep->fec.hthi |= csrVal;
 214        else
 215                fep->fec.htlo |= csrVal;
 216}
 217
 218static void set_multicast_finish(struct net_device *dev)
 219{
 220        struct fs_enet_private *fep = netdev_priv(dev);
 221        struct fec __iomem *fecp = fep->fec.fecp;
 222
 223        /* if all multi or too many multicasts; just enable all */
 224        if ((dev->flags & IFF_ALLMULTI) != 0 ||
 225            netdev_mc_count(dev) > FEC_MAX_MULTICAST_ADDRS) {
 226                fep->fec.hthi = 0xffffffffU;
 227                fep->fec.htlo = 0xffffffffU;
 228        }
 229
 230        FC(fecp, r_cntrl, FEC_RCNTRL_PROM);
 231        FW(fecp, grp_hash_table_high, fep->fec.hthi);
 232        FW(fecp, grp_hash_table_low, fep->fec.htlo);
 233}
 234
 235static void set_multicast_list(struct net_device *dev)
 236{
 237        struct netdev_hw_addr *ha;
 238
 239        if ((dev->flags & IFF_PROMISC) == 0) {
 240                set_multicast_start(dev);
 241                netdev_for_each_mc_addr(ha, dev)
 242                        set_multicast_one(dev, ha->addr);
 243                set_multicast_finish(dev);
 244        } else
 245                set_promiscuous_mode(dev);
 246}
 247
 248static void restart(struct net_device *dev)
 249{
 250        struct fs_enet_private *fep = netdev_priv(dev);
 251        struct fec __iomem *fecp = fep->fec.fecp;
 252        const struct fs_platform_info *fpi = fep->fpi;
 253        dma_addr_t rx_bd_base_phys, tx_bd_base_phys;
 254        int r;
 255        u32 addrhi, addrlo;
 256
 257        struct mii_bus* mii = fep->phydev->bus;
 258        struct fec_info* fec_inf = mii->priv;
 259
 260        r = whack_reset(fep->fec.fecp);
 261        if (r != 0)
 262                dev_err(fep->dev, "FEC Reset FAILED!\n");
 263        /*
 264         * Set station address.
 265         */
 266        addrhi = ((u32) dev->dev_addr[0] << 24) |
 267                 ((u32) dev->dev_addr[1] << 16) |
 268                 ((u32) dev->dev_addr[2] <<  8) |
 269                  (u32) dev->dev_addr[3];
 270        addrlo = ((u32) dev->dev_addr[4] << 24) |
 271                 ((u32) dev->dev_addr[5] << 16);
 272        FW(fecp, addr_low, addrhi);
 273        FW(fecp, addr_high, addrlo);
 274
 275        /*
 276         * Reset all multicast.
 277         */
 278        FW(fecp, grp_hash_table_high, fep->fec.hthi);
 279        FW(fecp, grp_hash_table_low, fep->fec.htlo);
 280
 281        /*
 282         * Set maximum receive buffer size.
 283         */
 284        FW(fecp, r_buff_size, PKT_MAXBLR_SIZE);
 285#ifdef CONFIG_FS_ENET_MPC5121_FEC
 286        FW(fecp, r_cntrl, PKT_MAXBUF_SIZE << 16);
 287#else
 288        FW(fecp, r_hash, PKT_MAXBUF_SIZE);
 289#endif
 290
 291        /* get physical address */
 292        rx_bd_base_phys = fep->ring_mem_addr;
 293        tx_bd_base_phys = rx_bd_base_phys + sizeof(cbd_t) * fpi->rx_ring;
 294
 295        /*
 296         * Set receive and transmit descriptor base.
 297         */
 298        FW(fecp, r_des_start, rx_bd_base_phys);
 299        FW(fecp, x_des_start, tx_bd_base_phys);
 300
 301        fs_init_bds(dev);
 302
 303        /*
 304         * Enable big endian and don't care about SDMA FC.
 305         */
 306#ifdef CONFIG_FS_ENET_MPC5121_FEC
 307        FS(fecp, dma_control, 0xC0000000);
 308#else
 309        FW(fecp, fun_code, 0x78000000);
 310#endif
 311
 312        /*
 313         * Set MII speed.
 314         */
 315        FW(fecp, mii_speed, fec_inf->mii_speed);
 316
 317        /*
 318         * Clear any outstanding interrupt.
 319         */
 320        FW(fecp, ievent, 0xffc0);
 321#ifndef CONFIG_FS_ENET_MPC5121_FEC
 322        FW(fecp, ivec, (virq_to_hw(fep->interrupt) / 2) << 29);
 323
 324        FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
 325#else
 326        /*
 327         * Only set MII/RMII mode - do not touch maximum frame length
 328         * configured before.
 329         */
 330        FS(fecp, r_cntrl, fpi->use_rmii ?
 331                        FEC_RCNTRL_RMII_MODE : FEC_RCNTRL_MII_MODE);
 332#endif
 333        /*
 334         * adjust to duplex mode
 335         */
 336        if (fep->phydev->duplex) {
 337                FC(fecp, r_cntrl, FEC_RCNTRL_DRT);
 338                FS(fecp, x_cntrl, FEC_TCNTRL_FDEN);     /* FD enable */
 339        } else {
 340                FS(fecp, r_cntrl, FEC_RCNTRL_DRT);
 341                FC(fecp, x_cntrl, FEC_TCNTRL_FDEN);     /* FD disable */
 342        }
 343
 344        /* Restore multicast and promiscuous settings */
 345        set_multicast_list(dev);
 346
 347        /*
 348         * Enable interrupts we wish to service.
 349         */
 350        FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB |
 351           FEC_ENET_RXF | FEC_ENET_RXB);
 352
 353        /*
 354         * And last, enable the transmit and receive processing.
 355         */
 356        FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
 357        FW(fecp, r_des_active, 0x01000000);
 358}
 359
 360static void stop(struct net_device *dev)
 361{
 362        struct fs_enet_private *fep = netdev_priv(dev);
 363        const struct fs_platform_info *fpi = fep->fpi;
 364        struct fec __iomem *fecp = fep->fec.fecp;
 365
 366        struct fec_info* feci= fep->phydev->bus->priv;
 367
 368        int i;
 369
 370        if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0)
 371                return;         /* already down */
 372
 373        FW(fecp, x_cntrl, 0x01);        /* Graceful transmit stop */
 374        for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) &&
 375             i < FEC_RESET_DELAY; i++)
 376                udelay(1);
 377
 378        if (i == FEC_RESET_DELAY)
 379                dev_warn(fep->dev, "FEC timeout on graceful transmit stop\n");
 380        /*
 381         * Disable FEC. Let only MII interrupts.
 382         */
 383        FW(fecp, imask, 0);
 384        FC(fecp, ecntrl, FEC_ECNTRL_ETHER_EN);
 385
 386        fs_cleanup_bds(dev);
 387
 388        /* shut down FEC1? that's where the mii bus is */
 389        if (fpi->has_phy) {
 390                FS(fecp, r_cntrl, fpi->use_rmii ?
 391                                FEC_RCNTRL_RMII_MODE :
 392                                FEC_RCNTRL_MII_MODE);   /* MII/RMII enable */
 393                FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
 394                FW(fecp, ievent, FEC_ENET_MII);
 395                FW(fecp, mii_speed, feci->mii_speed);
 396        }
 397}
 398
 399static void napi_clear_rx_event(struct net_device *dev)
 400{
 401        struct fs_enet_private *fep = netdev_priv(dev);
 402        struct fec __iomem *fecp = fep->fec.fecp;
 403
 404        FW(fecp, ievent, FEC_NAPI_RX_EVENT_MSK);
 405}
 406
 407static void napi_enable_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        FS(fecp, imask, FEC_NAPI_RX_EVENT_MSK);
 413}
 414
 415static void napi_disable_rx(struct net_device *dev)
 416{
 417        struct fs_enet_private *fep = netdev_priv(dev);
 418        struct fec __iomem *fecp = fep->fec.fecp;
 419
 420        FC(fecp, imask, FEC_NAPI_RX_EVENT_MSK);
 421}
 422
 423static void napi_clear_tx_event(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, ievent, FEC_NAPI_TX_EVENT_MSK);
 429}
 430
 431static void napi_enable_tx(struct net_device *dev)
 432{
 433        struct fs_enet_private *fep = netdev_priv(dev);
 434        struct fec __iomem *fecp = fep->fec.fecp;
 435
 436        FS(fecp, imask, FEC_NAPI_TX_EVENT_MSK);
 437}
 438
 439static void napi_disable_tx(struct net_device *dev)
 440{
 441        struct fs_enet_private *fep = netdev_priv(dev);
 442        struct fec __iomem *fecp = fep->fec.fecp;
 443
 444        FC(fecp, imask, FEC_NAPI_TX_EVENT_MSK);
 445}
 446
 447static void rx_bd_done(struct net_device *dev)
 448{
 449        struct fs_enet_private *fep = netdev_priv(dev);
 450        struct fec __iomem *fecp = fep->fec.fecp;
 451
 452        FW(fecp, r_des_active, 0x01000000);
 453}
 454
 455static void tx_kickstart(struct net_device *dev)
 456{
 457        struct fs_enet_private *fep = netdev_priv(dev);
 458        struct fec __iomem *fecp = fep->fec.fecp;
 459
 460        FW(fecp, x_des_active, 0x01000000);
 461}
 462
 463static u32 get_int_events(struct net_device *dev)
 464{
 465        struct fs_enet_private *fep = netdev_priv(dev);
 466        struct fec __iomem *fecp = fep->fec.fecp;
 467
 468        return FR(fecp, ievent) & FR(fecp, imask);
 469}
 470
 471static void clear_int_events(struct net_device *dev, u32 int_events)
 472{
 473        struct fs_enet_private *fep = netdev_priv(dev);
 474        struct fec __iomem *fecp = fep->fec.fecp;
 475
 476        FW(fecp, ievent, int_events);
 477}
 478
 479static void ev_error(struct net_device *dev, u32 int_events)
 480{
 481        struct fs_enet_private *fep = netdev_priv(dev);
 482
 483        dev_warn(fep->dev, "FEC ERROR(s) 0x%x\n", int_events);
 484}
 485
 486static int get_regs(struct net_device *dev, void *p, int *sizep)
 487{
 488        struct fs_enet_private *fep = netdev_priv(dev);
 489
 490        if (*sizep < sizeof(struct fec))
 491                return -EINVAL;
 492
 493        memcpy_fromio(p, fep->fec.fecp, sizeof(struct fec));
 494
 495        return 0;
 496}
 497
 498static int get_regs_len(struct net_device *dev)
 499{
 500        return sizeof(struct fec);
 501}
 502
 503static void tx_restart(struct net_device *dev)
 504{
 505        /* nothing */
 506}
 507
 508/*************************************************************************/
 509
 510const struct fs_ops fs_fec_ops = {
 511        .setup_data             = setup_data,
 512        .cleanup_data           = cleanup_data,
 513        .set_multicast_list     = set_multicast_list,
 514        .restart                = restart,
 515        .stop                   = stop,
 516        .napi_clear_rx_event    = napi_clear_rx_event,
 517        .napi_enable_rx         = napi_enable_rx,
 518        .napi_disable_rx        = napi_disable_rx,
 519        .napi_clear_tx_event    = napi_clear_tx_event,
 520        .napi_enable_tx         = napi_enable_tx,
 521        .napi_disable_tx        = napi_disable_tx,
 522        .rx_bd_done             = rx_bd_done,
 523        .tx_kickstart           = tx_kickstart,
 524        .get_int_events         = get_int_events,
 525        .clear_int_events       = clear_int_events,
 526        .ev_error               = ev_error,
 527        .get_regs               = get_regs,
 528        .get_regs_len           = get_regs_len,
 529        .tx_restart             = tx_restart,
 530        .allocate_bd            = allocate_bd,
 531        .free_bd                = free_bd,
 532};
 533
 534