drivers/net/cpsw.c

   1 /*
   2  * CPSW Ethernet Switch Driver
   3  *
   4  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation version 2.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether express or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <common.h>
  17 #include <command.h>
  18 #include <net.h>
  19 #include <miiphy.h>
  20 #include <malloc.h>
  21 #include <net.h>
  22 #include <netdev.h>
  23 #include <cpsw.h>
  24 #include <asm/errno.h>
  25 #include <asm/io.h>
  26 #include <phy.h>
  27 #include <asm/arch/cpu.h>
  28
  29 #define BITMASK(bits)           (BIT(bits) - 1)
  30 #define PHY_REG_MASK            0x1f
  31 #define PHY_ID_MASK             0x1f
  32 #define NUM_DESCS               (PKTBUFSRX * 2)
  33 #define PKT_MIN                 60
  34 #define PKT_MAX                 (1500 + 14 + 4 + 4)
  35 #define CLEAR_BIT               1
  36 #define GIGABITEN               BIT(7)
  37 #define FULLDUPLEXEN            BIT(0)
  38 #define MIIEN                   BIT(15)
  39
  40 /* DMA Registers */
  41 #define CPDMA_TXCONTROL         0x004
  42 #define CPDMA_RXCONTROL         0x014
  43 #define CPDMA_SOFTRESET         0x01c
  44 #define CPDMA_RXFREE            0x0e0
  45 #define CPDMA_TXHDP_VER1        0x100
  46 #define CPDMA_TXHDP_VER2        0x200
  47 #define CPDMA_RXHDP_VER1        0x120
  48 #define CPDMA_RXHDP_VER2        0x220
  49 #define CPDMA_TXCP_VER1         0x140
  50 #define CPDMA_TXCP_VER2         0x240
  51 #define CPDMA_RXCP_VER1         0x160
  52 #define CPDMA_RXCP_VER2         0x260
  53
  54 #define CPDMA_RAM_ADDR          0x4a102000
  55
  56 /* Descriptor mode bits */
  57 #define CPDMA_DESC_SOP          BIT(31)
  58 #define CPDMA_DESC_EOP          BIT(30)
  59 #define CPDMA_DESC_OWNER        BIT(29)
  60 #define CPDMA_DESC_EOQ          BIT(28)
  61
  62 /*
  63  * This timeout definition is a worst-case ultra defensive measure against
  64  * unexpected controller lock ups.  Ideally, we should never ever hit this
  65  * scenario in practice.
  66  */
  67 #define MDIO_TIMEOUT            100 /* msecs */
  68 #define CPDMA_TIMEOUT           100 /* msecs */
  69
  70 struct cpsw_mdio_regs {
  71         u32     version;
  72         u32     control;
  73 #define CONTROL_IDLE            BIT(31)
  74 #define CONTROL_ENABLE          BIT(30)
  75
  76         u32     alive;
  77         u32     link;
  78         u32     linkintraw;
  79         u32     linkintmasked;
  80         u32     __reserved_0[2];
  81         u32     userintraw;
  82         u32     userintmasked;
  83         u32     userintmaskset;
  84         u32     userintmaskclr;
  85         u32     __reserved_1[20];
  86
  87         struct {
  88                 u32             access;
  89                 u32             physel;
  90 #define USERACCESS_GO           BIT(31)
  91 #define USERACCESS_WRITE        BIT(30)
  92 #define USERACCESS_ACK          BIT(29)
  93 #define USERACCESS_READ         (0)
  94 #define USERACCESS_DATA         (0xffff)
  95         } user[0];
  96 };
  97
  98 struct cpsw_regs {
  99         u32     id_ver;
 100         u32     control;
 101         u32     soft_reset;
 102         u32     stat_port_en;
 103         u32     ptype;
 104 };
 105
 106 struct cpsw_slave_regs {
 107         u32     max_blks;
 108         u32     blk_cnt;
 109         u32     flow_thresh;
 110         u32     port_vlan;
 111         u32     tx_pri_map;
 112         u32     gap_thresh;
 113         u32     sa_lo;
 114         u32     sa_hi;
 115 };
 116
 117 struct cpsw_host_regs {
 118         u32     max_blks;
 119         u32     blk_cnt;
 120         u32     flow_thresh;
 121         u32     port_vlan;
 122         u32     tx_pri_map;
 123         u32     cpdma_tx_pri_map;
 124         u32     cpdma_rx_chan_map;
 125 };
 126
 127 struct cpsw_sliver_regs {
 128         u32     id_ver;
 129         u32     mac_control;
 130         u32     mac_status;
 131         u32     soft_reset;
 132         u32     rx_maxlen;
 133         u32     __reserved_0;
 134         u32     rx_pause;
 135         u32     tx_pause;
 136         u32     __reserved_1;
 137         u32     rx_pri_map;
 138 };
 139
 140 #define ALE_ENTRY_BITS          68
 141 #define ALE_ENTRY_WORDS         DIV_ROUND_UP(ALE_ENTRY_BITS, 32)
 142
 143 /* ALE Registers */
 144 #define ALE_CONTROL             0x08
 145 #define ALE_UNKNOWNVLAN         0x18
 146 #define ALE_TABLE_CONTROL       0x20
 147 #define ALE_TABLE               0x34
 148 #define ALE_PORTCTL             0x40
 149
 150 #define ALE_TABLE_WRITE         BIT(31)
 151
 152 #define ALE_TYPE_FREE                   0
 153 #define ALE_TYPE_ADDR                   1
 154 #define ALE_TYPE_VLAN                   2
 155 #define ALE_TYPE_VLAN_ADDR              3
 156
 157 #define ALE_UCAST_PERSISTANT            0
 158 #define ALE_UCAST_UNTOUCHED             1
 159 #define ALE_UCAST_OUI                   2
 160 #define ALE_UCAST_TOUCHED               3
 161
 162 #define ALE_MCAST_FWD                   0
 163 #define ALE_MCAST_BLOCK_LEARN_FWD       1
 164 #define ALE_MCAST_FWD_LEARN             2
 165 #define ALE_MCAST_FWD_2                 3
 166
 167 enum cpsw_ale_port_state {
 168         ALE_PORT_STATE_DISABLE  = 0x00,
 169         ALE_PORT_STATE_BLOCK    = 0x01,
 170         ALE_PORT_STATE_LEARN    = 0x02,
 171         ALE_PORT_STATE_FORWARD  = 0x03,
 172 };
 173
 174 /* ALE unicast entry flags - passed into cpsw_ale_add_ucast() */
 175 #define ALE_SECURE      1
 176 #define ALE_BLOCKED     2
 177
 178 struct cpsw_slave {
 179         struct cpsw_slave_regs          *regs;
 180         struct cpsw_sliver_regs         *sliver;
 181         int                             slave_num;
 182         u32                             mac_control;
 183         struct cpsw_slave_data          *data;
 184 };
 185
 186 struct cpdma_desc {
 187         /* hardware fields */
 188         u32                     hw_next;
 189         u32                     hw_buffer;
 190         u32                     hw_len;
 191         u32                     hw_mode;
 192         /* software fields */
 193         u32                     sw_buffer;
 194         u32                     sw_len;
 195 };
 196
 197 struct cpdma_chan {
 198         struct cpdma_desc       *head, *tail;
 199         void                    *hdp, *cp, *rxfree;
 200 };
 201
 202 #define desc_write(desc, fld, val)      __raw_writel((u32)(val), &(desc)->fld)
 203 #define desc_read(desc, fld)            __raw_readl(&(desc)->fld)
 204 #define desc_read_ptr(desc, fld)        ((void *)__raw_readl(&(desc)->fld))
 205
 206 #define chan_write(chan, fld, val)      __raw_writel((u32)(val), (chan)->fld)
 207 #define chan_read(chan, fld)            __raw_readl((chan)->fld)
 208 #define chan_read_ptr(chan, fld)        ((void *)__raw_readl((chan)->fld))
 209
 210 #define for_each_slave(slave, priv) \
 211         for (slave = (priv)->slaves; slave != (priv)->slaves + \
 212                                 (priv)->data.slaves; slave++)
 213
 214 struct cpsw_priv {
 215         struct eth_device               *dev;
 216         struct cpsw_platform_data       data;
 217         int                             host_port;
 218
 219         struct cpsw_regs                *regs;
 220         void                            *dma_regs;
 221         struct cpsw_host_regs           *host_port_regs;
 222         void                            *ale_regs;
 223
 224         struct cpdma_desc               *descs;
 225         struct cpdma_desc               *desc_free;
 226         struct cpdma_chan               rx_chan, tx_chan;
 227
 228         struct cpsw_slave               *slaves;
 229         struct phy_device               *phydev;
 230         struct mii_dev                  *bus;
 231
 232         u32                             mdio_link;
 233         u32                             phy_mask;
 234 };
 235
 236 static inline int cpsw_ale_get_field(u32 *ale_entry, u32 start, u32 bits)
 237 {
 238         int idx;
 239
 240         idx    = start / 32;
 241         start -= idx * 32;
 242         idx    = 2 - idx; /* flip */
 243         return (ale_entry[idx] >> start) & BITMASK(bits);
 244 }
 245
 246 static inline void cpsw_ale_set_field(u32 *ale_entry, u32 start, u32 bits,
 247                                       u32 value)
 248 {
 249         int idx;
 250
 251         value &= BITMASK(bits);
 252         idx    = start / 32;
 253         start -= idx * 32;
 254         idx    = 2 - idx; /* flip */
 255         ale_entry[idx] &= ~(BITMASK(bits) << start);
 256         ale_entry[idx] |=  (value << start);
 257 }
 258
 259 #define DEFINE_ALE_FIELD(name, start, bits)                             \
 260 static inline int cpsw_ale_get_##name(u32 *ale_entry)                   \
 261 {                                                                       \
 262         return cpsw_ale_get_field(ale_entry, start, bits);              \
 263 }                                                                       \
 264 static inline void cpsw_ale_set_##name(u32 *ale_entry, u32 value)       \
 265 {                                                                       \
 266         cpsw_ale_set_field(ale_entry, start, bits, value);              \
 267 }
 268
 269 DEFINE_ALE_FIELD(entry_type,            60,     2)
 270 DEFINE_ALE_FIELD(mcast_state,           62,     2)
 271 DEFINE_ALE_FIELD(port_mask,             66,     3)
 272 DEFINE_ALE_FIELD(ucast_type,            62,     2)
 273 DEFINE_ALE_FIELD(port_num,              66,     2)
 274 DEFINE_ALE_FIELD(blocked,               65,     1)
 275 DEFINE_ALE_FIELD(secure,                64,     1)
 276 DEFINE_ALE_FIELD(mcast,                 40,     1)
 277
 278 /* The MAC address field in the ALE entry cannot be macroized as above */
 279 static inline void cpsw_ale_get_addr(u32 *ale_entry, u8 *addr)
 280 {
 281         int i;
 282
 283         for (i = 0; i < 6; i++)
 284                 addr[i] = cpsw_ale_get_field(ale_entry, 40 - 8*i, 8);
 285 }
 286
 287 static inline void cpsw_ale_set_addr(u32 *ale_entry, u8 *addr)
 288 {
 289         int i;
 290
 291         for (i = 0; i < 6; i++)
 292                 cpsw_ale_set_field(ale_entry, 40 - 8*i, 8, addr[i]);
 293 }
 294
 295 static int cpsw_ale_read(struct cpsw_priv *priv, int idx, u32 *ale_entry)
 296 {
 297         int i;
 298
 299         __raw_writel(idx, priv->ale_regs + ALE_TABLE_CONTROL);
 300
 301         for (i = 0; i < ALE_ENTRY_WORDS; i++)
 302                 ale_entry[i] = __raw_readl(priv->ale_regs + ALE_TABLE + 4 * i);
 303
 304         return idx;
 305 }
 306
 307 static int cpsw_ale_write(struct cpsw_priv *priv, int idx, u32 *ale_entry)
 308 {
 309         int i;
 310
 311         for (i = 0; i < ALE_ENTRY_WORDS; i++)
 312                 __raw_writel(ale_entry[i], priv->ale_regs + ALE_TABLE + 4 * i);
 313
 314         __raw_writel(idx | ALE_TABLE_WRITE, priv->ale_regs + ALE_TABLE_CONTROL);
 315
 316         return idx;
 317 }
 318
 319 static int cpsw_ale_match_addr(struct cpsw_priv *priv, u8* addr)
 320 {
 321         u32 ale_entry[ALE_ENTRY_WORDS];
 322         int type, idx;
 323
 324         for (idx = 0; idx < priv->data.ale_entries; idx++) {
 325                 u8 entry_addr[6];
 326
 327                 cpsw_ale_read(priv, idx, ale_entry);
 328                 type = cpsw_ale_get_entry_type(ale_entry);
 329                 if (type != ALE_TYPE_ADDR && type != ALE_TYPE_VLAN_ADDR)
 330                         continue;
 331                 cpsw_ale_get_addr(ale_entry, entry_addr);
 332                 if (memcmp(entry_addr, addr, 6) == 0)
 333                         return idx;
 334         }
 335         return -ENOENT;
 336 }
 337
 338 static int cpsw_ale_match_free(struct cpsw_priv *priv)
 339 {
 340         u32 ale_entry[ALE_ENTRY_WORDS];
 341         int type, idx;
 342
 343         for (idx = 0; idx < priv->data.ale_entries; idx++) {
 344                 cpsw_ale_read(priv, idx, ale_entry);
 345                 type = cpsw_ale_get_entry_type(ale_entry);
 346                 if (type == ALE_TYPE_FREE)
 347                         return idx;
 348         }
 349         return -ENOENT;
 350 }
 351
 352 static int cpsw_ale_find_ageable(struct cpsw_priv *priv)
 353 {
 354         u32 ale_entry[ALE_ENTRY_WORDS];
 355         int type, idx;
 356
 357         for (idx = 0; idx < priv->data.ale_entries; idx++) {
 358                 cpsw_ale_read(priv, idx, ale_entry);
 359                 type = cpsw_ale_get_entry_type(ale_entry);
 360                 if (type != ALE_TYPE_ADDR && type != ALE_TYPE_VLAN_ADDR)
 361                         continue;
 362                 if (cpsw_ale_get_mcast(ale_entry))
 363                         continue;
 364                 type = cpsw_ale_get_ucast_type(ale_entry);
 365                 if (type != ALE_UCAST_PERSISTANT &&
 366                     type != ALE_UCAST_OUI)
 367                         return idx;
 368         }
 369         return -ENOENT;
 370 }
 371
 372 static int cpsw_ale_add_ucast(struct cpsw_priv *priv, u8 *addr,
 373                               int port, int flags)
 374 {
 375         u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
 376         int idx;
 377
 378         cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_ADDR);
 379         cpsw_ale_set_addr(ale_entry, addr);
 380         cpsw_ale_set_ucast_type(ale_entry, ALE_UCAST_PERSISTANT);
 381         cpsw_ale_set_secure(ale_entry, (flags & ALE_SECURE) ? 1 : 0);
 382         cpsw_ale_set_blocked(ale_entry, (flags & ALE_BLOCKED) ? 1 : 0);
 383         cpsw_ale_set_port_num(ale_entry, port);
 384
 385         idx = cpsw_ale_match_addr(priv, addr);
 386         if (idx < 0)
 387                 idx = cpsw_ale_match_free(priv);
 388         if (idx < 0)
 389                 idx = cpsw_ale_find_ageable(priv);
 390         if (idx < 0)
 391                 return -ENOMEM;
 392
 393         cpsw_ale_write(priv, idx, ale_entry);
 394         return 0;
 395 }
 396
 397 static int cpsw_ale_add_mcast(struct cpsw_priv *priv, u8 *addr, int port_mask)
 398 {
 399         u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
 400         int idx, mask;
 401
 402         idx = cpsw_ale_match_addr(priv, addr);
 403         if (idx >= 0)
 404                 cpsw_ale_read(priv, idx, ale_entry);
 405
 406         cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_ADDR);
 407         cpsw_ale_set_addr(ale_entry, addr);
 408         cpsw_ale_set_mcast_state(ale_entry, ALE_MCAST_FWD_2);
 409
 410         mask = cpsw_ale_get_port_mask(ale_entry);
 411         port_mask |= mask;
 412         cpsw_ale_set_port_mask(ale_entry, port_mask);
 413
 414         if (idx < 0)
 415                 idx = cpsw_ale_match_free(priv);
 416         if (idx < 0)
 417                 idx = cpsw_ale_find_ageable(priv);
 418         if (idx < 0)
 419                 return -ENOMEM;
 420
 421         cpsw_ale_write(priv, idx, ale_entry);
 422         return 0;
 423 }
 424
 425 static inline void cpsw_ale_control(struct cpsw_priv *priv, int bit, int val)
 426 {
 427         u32 tmp, mask = BIT(bit);
 428
 429         tmp  = __raw_readl(priv->ale_regs + ALE_CONTROL);
 430         tmp &= ~mask;
 431         tmp |= val ? mask : 0;
 432         __raw_writel(tmp, priv->ale_regs + ALE_CONTROL);
 433 }
 434
 435 #define cpsw_ale_enable(priv, val)      cpsw_ale_control(priv, 31, val)
 436 #define cpsw_ale_clear(priv, val)       cpsw_ale_control(priv, 30, val)
 437 #define cpsw_ale_vlan_aware(priv, val)  cpsw_ale_control(priv,  2, val)
 438
 439 static inline void cpsw_ale_port_state(struct cpsw_priv *priv, int port,
 440                                        int val)
 441 {
 442         int offset = ALE_PORTCTL + 4 * port;
 443         u32 tmp, mask = 0x3;
 444
 445         tmp  = __raw_readl(priv->ale_regs + offset);
 446         tmp &= ~mask;
 447         tmp |= val & mask;
 448         __raw_writel(tmp, priv->ale_regs + offset);
 449 }
 450
 451 static struct cpsw_mdio_regs *mdio_regs;
 452
 453 /* wait until hardware is ready for another user access */
 454 static inline u32 wait_for_user_access(void)
 455 {
 456         u32 reg = 0;
 457         int timeout = MDIO_TIMEOUT;
 458
 459         while (timeout-- &&
 460         ((reg = __raw_readl(&mdio_regs->user[0].access)) & USERACCESS_GO))
 461                 udelay(10);
 462
 463         if (timeout == -1) {
 464                 printf("wait_for_user_access Timeout\n");
 465                 return -ETIMEDOUT;
 466         }
 467         return reg;
 468 }
 469
 470 /* wait until hardware state machine is idle */
 471 static inline void wait_for_idle(void)
 472 {
 473         int timeout = MDIO_TIMEOUT;
 474
 475         while (timeout-- &&
 476                 ((__raw_readl(&mdio_regs->control) & CONTROL_IDLE) == 0))
 477                 udelay(10);
 478
 479         if (timeout == -1)
 480                 printf("wait_for_idle Timeout\n");
 481 }
 482
 483 static int cpsw_mdio_read(struct mii_dev *bus, int phy_id,
 484                                 int dev_addr, int phy_reg)
 485 {
 486         unsigned short data;
 487         u32 reg;
 488
 489         if (phy_reg & ~PHY_REG_MASK || phy_id & ~PHY_ID_MASK)
 490                 return -EINVAL;
 491
 492         wait_for_user_access();
 493         reg = (USERACCESS_GO | USERACCESS_READ | (phy_reg << 21) |
 494                (phy_id << 16));
 495         __raw_writel(reg, &mdio_regs->user[0].access);
 496         reg = wait_for_user_access();
 497
 498         data = (reg & USERACCESS_ACK) ? (reg & USERACCESS_DATA) : -1;
 499         return data;
 500 }
 501
 502 static int cpsw_mdio_write(struct mii_dev *bus, int phy_id, int dev_addr,
 503                                 int phy_reg, u16 data)
 504 {
 505         u32 reg;
 506
 507         if (phy_reg & ~PHY_REG_MASK || phy_id & ~PHY_ID_MASK)
 508                 return -EINVAL;
 509
 510         wait_for_user_access();
 511         reg = (USERACCESS_GO | USERACCESS_WRITE | (phy_reg << 21) |
 512                    (phy_id << 16) | (data & USERACCESS_DATA));
 513         __raw_writel(reg, &mdio_regs->user[0].access);
 514         wait_for_user_access();
 515
 516         return 0;
 517 }
 518
 519 static void cpsw_mdio_init(char *name, u32 mdio_base, u32 div)
 520 {
 521         struct mii_dev *bus = mdio_alloc();
 522
 523         mdio_regs = (struct cpsw_mdio_regs *)mdio_base;
 524
 525         /* set enable and clock divider */
 526         __raw_writel(div | CONTROL_ENABLE, &mdio_regs->control);
 527
 528         /*
 529          * wait for scan logic to settle:
 530          * the scan time consists of (a) a large fixed component, and (b) a
 531          * small component that varies with the mii bus frequency.  These
 532          * were estimated using measurements at 1.1 and 2.2 MHz on tnetv107x
 533          * silicon.  Since the effect of (b) was found to be largely
 534          * negligible, we keep things simple here.
 535          */
 536         udelay(1000);
 537
 538         bus->read = cpsw_mdio_read;
 539         bus->write = cpsw_mdio_write;
 540         sprintf(bus->name, name);
 541
 542         mdio_register(bus);
 543 }
 544
 545 /* Set a self-clearing bit in a register, and wait for it to clear */
 546 static inline void setbit_and_wait_for_clear32(void *addr)
 547 {
 548         __raw_writel(CLEAR_BIT, addr);
 549         while (__raw_readl(addr) & CLEAR_BIT)
 550                 ;
 551 }
 552
 553 #define mac_hi(mac)     (((mac)[0] << 0) | ((mac)[1] << 8) |    \
 554                          ((mac)[2] << 16) | ((mac)[3] << 24))
 555 #define mac_lo(mac)     (((mac)[4] << 0) | ((mac)[5] << 8))
 556
 557 static void cpsw_set_slave_mac(struct cpsw_slave *slave,
 558                                struct cpsw_priv *priv)
 559 {
 560         __raw_writel(mac_hi(priv->dev->enetaddr), &slave->regs->sa_hi);
 561         __raw_writel(mac_lo(priv->dev->enetaddr), &slave->regs->sa_lo);
 562 }
 563
 564 static void cpsw_slave_update_link(struct cpsw_slave *slave,
 565                                    struct cpsw_priv *priv, int *link)
 566 {
 567         struct phy_device *phy = priv->phydev;
 568         u32 mac_control = 0;
 569
 570         phy_startup(phy);
 571         *link = phy->link;
 572
 573         if (*link) { /* link up */
 574                 mac_control = priv->data.mac_control;
 575                 if (phy->speed == 1000)
 576                         mac_control |= GIGABITEN;
 577                 if (phy->duplex == DUPLEX_FULL)
 578                         mac_control |= FULLDUPLEXEN;
 579                 if (phy->speed == 100)
 580                         mac_control |= MIIEN;
 581         }
 582
 583         if (mac_control == slave->mac_control)
 584                 return;
 585
 586         if (mac_control) {
 587                 printf("link up on port %d, speed %d, %s duplex\n",
 588                                 slave->slave_num, phy->speed,
 589                                 (phy->duplex == DUPLEX_FULL) ? "full" : "half");
 590         } else {
 591                 printf("link down on port %d\n", slave->slave_num);
 592         }
 593
 594         __raw_writel(mac_control, &slave->sliver->mac_control);
 595         slave->mac_control = mac_control;
 596 }
 597
 598 static int cpsw_update_link(struct cpsw_priv *priv)
 599 {
 600         int link = 0;
 601         struct cpsw_slave *slave;
 602
 603         for_each_slave(slave, priv)
 604                 cpsw_slave_update_link(slave, priv, &link);
 605         priv->mdio_link = readl(&mdio_regs->link);
 606         return link;
 607 }
 608
 609 static int cpsw_check_link(struct cpsw_priv *priv)
 610 {
 611         u32 link = 0;
 612
 613         link = __raw_readl(&mdio_regs->link) & priv->phy_mask;
 614         if ((link) && (link == priv->mdio_link))
 615                 return 1;
 616
 617         return cpsw_update_link(priv);
 618 }
 619
 620 static inline u32  cpsw_get_slave_port(struct cpsw_priv *priv, u32 slave_num)
 621 {
 622         if (priv->host_port == 0)
 623                 return slave_num + 1;
 624         else
 625                 return slave_num;
 626 }
 627
 628 static void cpsw_slave_init(struct cpsw_slave *slave, struct cpsw_priv *priv)
 629 {
 630         u32     slave_port;
 631
 632         setbit_and_wait_for_clear32(&slave->sliver->soft_reset);
 633
 634         /* setup priority mapping */
 635         __raw_writel(0x76543210, &slave->sliver->rx_pri_map);
 636         __raw_writel(0x33221100, &slave->regs->tx_pri_map);
 637
 638         /* setup max packet size, and mac address */
 639         __raw_writel(PKT_MAX, &slave->sliver->rx_maxlen);
 640         cpsw_set_slave_mac(slave, priv);
 641
 642         slave->mac_control = 0; /* no link yet */
 643
 644         /* enable forwarding */
 645         slave_port = cpsw_get_slave_port(priv, slave->slave_num);
 646         cpsw_ale_port_state(priv, slave_port, ALE_PORT_STATE_FORWARD);
 647
 648         cpsw_ale_add_mcast(priv, NetBcastAddr, 1 << slave_port);
 649
 650         priv->phy_mask |= 1 << slave->data->phy_id;
 651 }
 652
 653 static struct cpdma_desc *cpdma_desc_alloc(struct cpsw_priv *priv)
 654 {
 655         struct cpdma_desc *desc = priv->desc_free;
 656
 657         if (desc)
 658                 priv->desc_free = desc_read_ptr(desc, hw_next);
 659         return desc;
 660 }
 661
 662 static void cpdma_desc_free(struct cpsw_priv *priv, struct cpdma_desc *desc)
 663 {
 664         if (desc) {
 665                 desc_write(desc, hw_next, priv->desc_free);
 666                 priv->desc_free = desc;
 667         }
 668 }
 669
 670 static int cpdma_submit(struct cpsw_priv *priv, struct cpdma_chan *chan,
 671                         void *buffer, int len)
 672 {
 673         struct cpdma_desc *desc, *prev;
 674         u32 mode;
 675
 676         desc = cpdma_desc_alloc(priv);
 677         if (!desc)
 678                 return -ENOMEM;
 679
 680         if (len < PKT_MIN)
 681                 len = PKT_MIN;
 682
 683         mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
 684
 685         desc_write(desc, hw_next,   0);
 686         desc_write(desc, hw_buffer, buffer);
 687         desc_write(desc, hw_len,    len);
 688         desc_write(desc, hw_mode,   mode | len);
 689         desc_write(desc, sw_buffer, buffer);
 690         desc_write(desc, sw_len,    len);
 691
 692         if (!chan->head) {
 693                 /* simple case - first packet enqueued */
 694                 chan->head = desc;
 695                 chan->tail = desc;
 696                 chan_write(chan, hdp, desc);
 697                 goto done;
 698         }
 699
 700         /* not the first packet - enqueue at the tail */
 701         prev = chan->tail;
 702         desc_write(prev, hw_next, desc);
 703         chan->tail = desc;
 704
 705         /* next check if EOQ has been triggered already */
 706         if (desc_read(prev, hw_mode) & CPDMA_DESC_EOQ)
 707                 chan_write(chan, hdp, desc);
 708
 709 done:
 710         if (chan->rxfree)
 711                 chan_write(chan, rxfree, 1);
 712         return 0;
 713 }
 714
 715 static int cpdma_process(struct cpsw_priv *priv, struct cpdma_chan *chan,
 716                          void **buffer, int *len)
 717 {
 718         struct cpdma_desc *desc = chan->head;
 719         u32 status;
 720
 721         if (!desc)
 722                 return -ENOENT;
 723
 724         status = desc_read(desc, hw_mode);
 725
 726         if (len)
 727                 *len = status & 0x7ff;
 728
 729         if (buffer)
 730                 *buffer = desc_read_ptr(desc, sw_buffer);
 731
 732         if (status & CPDMA_DESC_OWNER) {
 733                 if (chan_read(chan, hdp) == 0) {
 734                         if (desc_read(desc, hw_mode) & CPDMA_DESC_OWNER)
 735                                 chan_write(chan, hdp, desc);
 736                 }
 737
 738                 return -EBUSY;
 739         }
 740
 741         chan->head = desc_read_ptr(desc, hw_next);
 742         chan_write(chan, cp, desc);
 743
 744         cpdma_desc_free(priv, desc);
 745         return 0;
 746 }
 747
 748 static int cpsw_init(struct eth_device *dev, bd_t *bis)
 749 {
 750         struct cpsw_priv        *priv = dev->priv;
 751         struct cpsw_slave       *slave;
 752         int i, ret;
 753
 754         /* soft reset the controller and initialize priv */
 755         setbit_and_wait_for_clear32(&priv->regs->soft_reset);
 756
 757         /* initialize and reset the address lookup engine */
 758         cpsw_ale_enable(priv, 1);
 759         cpsw_ale_clear(priv, 1);
 760         cpsw_ale_vlan_aware(priv, 0); /* vlan unaware mode */
 761
 762         /* setup host port priority mapping */
 763         __raw_writel(0x76543210, &priv->host_port_regs->cpdma_tx_pri_map);
 764         __raw_writel(0, &priv->host_port_regs->cpdma_rx_chan_map);
 765
 766         /* disable priority elevation and enable statistics on all ports */
 767         __raw_writel(0, &priv->regs->ptype);
 768
 769         /* enable statistics collection only on the host port */
 770         __raw_writel(BIT(priv->host_port), &priv->regs->stat_port_en);
 771
 772         cpsw_ale_port_state(priv, priv->host_port, ALE_PORT_STATE_FORWARD);
 773
 774         cpsw_ale_add_ucast(priv, priv->dev->enetaddr, priv->host_port,
 775                            ALE_SECURE);
 776         cpsw_ale_add_mcast(priv, NetBcastAddr, 1 << priv->host_port);
 777
 778         for_each_slave(slave, priv)
 779                 cpsw_slave_init(slave, priv);
 780
 781         cpsw_update_link(priv);
 782
 783         /* init descriptor pool */
 784         for (i = 0; i < NUM_DESCS; i++) {
 785                 desc_write(&priv->descs[i], hw_next,
 786                            (i == (NUM_DESCS - 1)) ? 0 : &priv->descs[i+1]);
 787         }
 788         priv->desc_free = &priv->descs[0];
 789
 790         /* initialize channels */
 791         if (priv->data.version == CPSW_CTRL_VERSION_2) {
 792                 memset(&priv->rx_chan, 0, sizeof(struct cpdma_chan));
 793                 priv->rx_chan.hdp       = priv->dma_regs + CPDMA_RXHDP_VER2;
 794                 priv->rx_chan.cp        = priv->dma_regs + CPDMA_RXCP_VER2;
 795                 priv->rx_chan.rxfree    = priv->dma_regs + CPDMA_RXFREE;
 796
 797                 memset(&priv->tx_chan, 0, sizeof(struct cpdma_chan));
 798                 priv->tx_chan.hdp       = priv->dma_regs + CPDMA_TXHDP_VER2;
 799                 priv->tx_chan.cp        = priv->dma_regs + CPDMA_TXCP_VER2;
 800         } else {
 801                 memset(&priv->rx_chan, 0, sizeof(struct cpdma_chan));
 802                 priv->rx_chan.hdp       = priv->dma_regs + CPDMA_RXHDP_VER1;
 803                 priv->rx_chan.cp        = priv->dma_regs + CPDMA_RXCP_VER1;
 804                 priv->rx_chan.rxfree    = priv->dma_regs + CPDMA_RXFREE;
 805
 806                 memset(&priv->tx_chan, 0, sizeof(struct cpdma_chan));
 807                 priv->tx_chan.hdp       = priv->dma_regs + CPDMA_TXHDP_VER1;
 808                 priv->tx_chan.cp        = priv->dma_regs + CPDMA_TXCP_VER1;
 809         }
 810
 811         /* clear dma state */
 812         setbit_and_wait_for_clear32(priv->dma_regs + CPDMA_SOFTRESET);
 813
 814         if (priv->data.version == CPSW_CTRL_VERSION_2) {
 815                 for (i = 0; i < priv->data.channels; i++) {
 816                         __raw_writel(0, priv->dma_regs + CPDMA_RXHDP_VER2 + 4
 817                                         * i);
 818                         __raw_writel(0, priv->dma_regs + CPDMA_RXFREE + 4
 819                                         * i);
 820                         __raw_writel(0, priv->dma_regs + CPDMA_RXCP_VER2 + 4
 821                                         * i);
 822                         __raw_writel(0, priv->dma_regs + CPDMA_TXHDP_VER2 + 4
 823                                         * i);
 824                         __raw_writel(0, priv->dma_regs + CPDMA_TXCP_VER2 + 4
 825                                         * i);
 826                 }
 827         } else {
 828                 for (i = 0; i < priv->data.channels; i++) {
 829                         __raw_writel(0, priv->dma_regs + CPDMA_RXHDP_VER1 + 4
 830                                         * i);
 831                         __raw_writel(0, priv->dma_regs + CPDMA_RXFREE + 4
 832                                         * i);
 833                         __raw_writel(0, priv->dma_regs + CPDMA_RXCP_VER1 + 4
 834                                         * i);
 835                         __raw_writel(0, priv->dma_regs + CPDMA_TXHDP_VER1 + 4
 836                                         * i);
 837                         __raw_writel(0, priv->dma_regs + CPDMA_TXCP_VER1 + 4
 838                                         * i);
 839
 840                 }
 841         }
 842
 843         __raw_writel(1, priv->dma_regs + CPDMA_TXCONTROL);
 844         __raw_writel(1, priv->dma_regs + CPDMA_RXCONTROL);
 845
 846         /* submit rx descs */
 847         for (i = 0; i < PKTBUFSRX; i++) {
 848                 ret = cpdma_submit(priv, &priv->rx_chan, NetRxPackets[i],
 849                                    PKTSIZE);
 850                 if (ret < 0) {
 851                         printf("error %d submitting rx desc\n", ret);
 852                         break;
 853                 }
 854         }
 855
 856         return 0;
 857 }
 858
 859 static void cpsw_halt(struct eth_device *dev)
 860 {
 861         struct cpsw_priv        *priv = dev->priv;
 862
 863         writel(0, priv->dma_regs + CPDMA_TXCONTROL);
 864         writel(0, priv->dma_regs + CPDMA_RXCONTROL);
 865
 866         /* soft reset the controller and initialize priv */
 867         setbit_and_wait_for_clear32(&priv->regs->soft_reset);
 868
 869         /* clear dma state */
 870         setbit_and_wait_for_clear32(priv->dma_regs + CPDMA_SOFTRESET);
 871
 872         priv->data.control(0);
 873 }
 874
 875 static int cpsw_send(struct eth_device *dev, void *packet, int length)
 876 {
 877         struct cpsw_priv        *priv = dev->priv;
 878         void *buffer;
 879         int len;
 880         int timeout = CPDMA_TIMEOUT;
 881
 882         if (!cpsw_check_link(priv))
 883                 return -EIO;
 884
 885         flush_dcache_range((unsigned long)packet,
 886                            (unsigned long)packet + length);
 887
 888         /* first reap completed packets */
 889         while (timeout-- &&
 890                 (cpdma_process(priv, &priv->tx_chan, &buffer, &len) >= 0))
 891                 ;
 892
 893         if (timeout == -1) {
 894                 printf("cpdma_process timeout\n");
 895                 return -ETIMEDOUT;
 896         }
 897
 898         return cpdma_submit(priv, &priv->tx_chan, packet, length);
 899 }
 900
 901 static int cpsw_recv(struct eth_device *dev)
 902 {
 903         struct cpsw_priv        *priv = dev->priv;
 904         void *buffer;
 905         int len;
 906
 907         cpsw_update_link(priv);
 908
 909         while (cpdma_process(priv, &priv->rx_chan, &buffer, &len) >= 0) {
 910                 invalidate_dcache_range((unsigned long)buffer,
 911                                         (unsigned long)buffer + PKTSIZE_ALIGN);
 912                 NetReceive(buffer, len);
 913                 cpdma_submit(priv, &priv->rx_chan, buffer, PKTSIZE);
 914         }
 915
 916         return 0;
 917 }
 918
 919 static void cpsw_slave_setup(struct cpsw_slave *slave, int slave_num,
 920                             struct cpsw_priv *priv)
 921 {
 922         void                    *regs = priv->regs;
 923         struct cpsw_slave_data  *data = priv->data.slave_data + slave_num;
 924         slave->slave_num = slave_num;
 925         slave->data     = data;
 926         slave->regs     = regs + data->slave_reg_ofs;
 927         slave->sliver   = regs + data->sliver_reg_ofs;
 928 }
 929
 930 static int cpsw_phy_init(struct eth_device *dev, struct cpsw_slave *slave)
 931 {
 932         struct cpsw_priv *priv = (struct cpsw_priv *)dev->priv;
 933         struct phy_device *phydev;
 934         u32 supported = (SUPPORTED_10baseT_Half |
 935                         SUPPORTED_10baseT_Full |
 936                         SUPPORTED_100baseT_Half |
 937                         SUPPORTED_100baseT_Full |
 938                         SUPPORTED_1000baseT_Full);
 939
 940         phydev = phy_connect(priv->bus,
 941                         CONFIG_PHY_ADDR,
 942                         dev,
 943                         slave->data->phy_if);
 944
 945         phydev->supported &= supported;
 946         phydev->advertising = phydev->supported;
 947
 948         priv->phydev = phydev;
 949         phy_config(phydev);
 950
 951         return 1;
 952 }
 953
 954 int cpsw_register(struct cpsw_platform_data *data)
 955 {
 956         struct cpsw_priv        *priv;
 957         struct cpsw_slave       *slave;
 958         void                    *regs = (void *)data->cpsw_base;
 959         struct eth_device       *dev;
 960
 961         dev = calloc(sizeof(*dev), 1);
 962         if (!dev)
 963                 return -ENOMEM;
 964
 965         priv = calloc(sizeof(*priv), 1);
 966         if (!priv) {
 967                 free(dev);
 968                 return -ENOMEM;
 969         }
 970
 971         priv->data = *data;
 972         priv->dev = dev;
 973
 974         priv->slaves = malloc(sizeof(struct cpsw_slave) * data->slaves);
 975         if (!priv->slaves) {
 976                 free(dev);
 977                 free(priv);
 978                 return -ENOMEM;
 979         }
 980
 981         priv->descs             = (void *)CPDMA_RAM_ADDR;
 982         priv->host_port         = data->host_port_num;
 983         priv->regs              = regs;
 984         priv->host_port_regs    = regs + data->host_port_reg_ofs;
 985         priv->dma_regs          = regs + data->cpdma_reg_ofs;
 986         priv->ale_regs          = regs + data->ale_reg_ofs;
 987
 988         int idx = 0;
 989
 990         for_each_slave(slave, priv) {
 991                 cpsw_slave_setup(slave, idx, priv);
 992                 idx = idx + 1;
 993         }
 994
 995         strcpy(dev->name, "cpsw");
 996         dev->iobase     = 0;
 997         dev->init       = cpsw_init;
 998         dev->halt       = cpsw_halt;
 999         dev->send       = cpsw_send;
1000         dev->recv       = cpsw_recv;
1001         dev->priv       = priv;
1002
1003         eth_register(dev);
1004
1005         cpsw_mdio_init(dev->name, data->mdio_base, data->mdio_div);
1006         priv->bus = miiphy_get_dev_by_name(dev->name);
1007         for_each_slave(slave, priv)
1008                 cpsw_phy_init(dev, slave);
1009
1010         return 1;
1011 }