drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c

   1 /*******************************************************************************
   2   This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
   3   DWC Ether MAC 10/100/1000 Universal version 3.41a  has been used for
   4   developing this code.
   5
   6   This only implements the mac core functions for this chip.
   7
   8   Copyright (C) 2007-2009  STMicroelectronics Ltd
   9
  10   This program is free software; you can redistribute it and/or modify it
  11   under the terms and conditions of the GNU General Public License,
  12   version 2, as published by the Free Software Foundation.
  13
  14   This program is distributed in the hope it will be useful, but WITHOUT
  15   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17   more details.
  18
  19   You should have received a copy of the GNU General Public License along with
  20   this program; if not, write to the Free Software Foundation, Inc.,
  21   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  22
  23   The full GNU General Public License is included in this distribution in
  24   the file called "COPYING".
  25
  26   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  27 *******************************************************************************/
  28
  29 #include <linux/crc32.h>
  30 #include <linux/slab.h>
  31 #include <linux/ethtool.h>
  32 #include <asm/io.h>
  33 #include "stmmac_pcs.h"
  34 #include "dwmac1000.h"
  35
  36 static void dwmac1000_core_init(struct mac_device_info *hw, int mtu)
  37 {
  38         void __iomem *ioaddr = hw->pcsr;
  39         u32 value = readl(ioaddr + GMAC_CONTROL);
  40
  41         /* Configure GMAC core */
  42         value |= GMAC_CORE_INIT;
  43
  44         if (mtu > 1500)
  45                 value |= GMAC_CONTROL_2K;
  46         if (mtu > 2000)
  47                 value |= GMAC_CONTROL_JE;
  48
  49         if (hw->ps) {
  50                 value |= GMAC_CONTROL_TE;
  51
  52                 if (hw->ps == SPEED_1000) {
  53                         value &= ~GMAC_CONTROL_PS;
  54                 } else {
  55                         value |= GMAC_CONTROL_PS;
  56
  57                         if (hw->ps == SPEED_10)
  58                                 value &= ~GMAC_CONTROL_FES;
  59                         else
  60                                 value |= GMAC_CONTROL_FES;
  61                 }
  62         }
  63
  64         writel(value, ioaddr + GMAC_CONTROL);
  65
  66         /* Mask GMAC interrupts */
  67         value = GMAC_INT_DEFAULT_MASK;
  68
  69         if (hw->pmt)
  70                 value &= ~GMAC_INT_DISABLE_PMT;
  71         if (hw->pcs)
  72                 value &= ~GMAC_INT_DISABLE_PCS;
  73
  74         writel(value, ioaddr + GMAC_INT_MASK);
  75
  76 #ifdef STMMAC_VLAN_TAG_USED
  77         /* Tag detection without filtering */
  78         writel(0x0, ioaddr + GMAC_VLAN_TAG);
  79 #endif
  80 }
  81
  82 static int dwmac1000_rx_ipc_enable(struct mac_device_info *hw)
  83 {
  84         void __iomem *ioaddr = hw->pcsr;
  85         u32 value = readl(ioaddr + GMAC_CONTROL);
  86
  87         if (hw->rx_csum)
  88                 value |= GMAC_CONTROL_IPC;
  89         else
  90                 value &= ~GMAC_CONTROL_IPC;
  91
  92         writel(value, ioaddr + GMAC_CONTROL);
  93
  94         value = readl(ioaddr + GMAC_CONTROL);
  95
  96         return !!(value & GMAC_CONTROL_IPC);
  97 }
  98
  99 static void dwmac1000_dump_regs(struct mac_device_info *hw)
 100 {
 101         void __iomem *ioaddr = hw->pcsr;
 102         int i;
 103         pr_info("\tDWMAC1000 regs (base addr = 0x%p)\n", ioaddr);
 104
 105         for (i = 0; i < 55; i++) {
 106                 int offset = i * 4;
 107                 pr_info("\tReg No. %d (offset 0x%x): 0x%08x\n", i,
 108                         offset, readl(ioaddr + offset));
 109         }
 110 }
 111
 112 static void dwmac1000_set_umac_addr(struct mac_device_info *hw,
 113                                     unsigned char *addr,
 114                                     unsigned int reg_n)
 115 {
 116         void __iomem *ioaddr = hw->pcsr;
 117         stmmac_set_mac_addr(ioaddr, addr, GMAC_ADDR_HIGH(reg_n),
 118                             GMAC_ADDR_LOW(reg_n));
 119 }
 120
 121 static void dwmac1000_get_umac_addr(struct mac_device_info *hw,
 122                                     unsigned char *addr,
 123                                     unsigned int reg_n)
 124 {
 125         void __iomem *ioaddr = hw->pcsr;
 126         stmmac_get_mac_addr(ioaddr, addr, GMAC_ADDR_HIGH(reg_n),
 127                             GMAC_ADDR_LOW(reg_n));
 128 }
 129
 130 static void dwmac1000_set_mchash(void __iomem *ioaddr, u32 *mcfilterbits,
 131                                  int mcbitslog2)
 132 {
 133         int numhashregs, regs;
 134
 135         switch (mcbitslog2) {
 136         case 6:
 137                 writel(mcfilterbits[0], ioaddr + GMAC_HASH_LOW);
 138                 writel(mcfilterbits[1], ioaddr + GMAC_HASH_HIGH);
 139                 return;
 140                 break;
 141         case 7:
 142                 numhashregs = 4;
 143                 break;
 144         case 8:
 145                 numhashregs = 8;
 146                 break;
 147         default:
 148                 pr_debug("STMMAC: err in setting mulitcast filter\n");
 149                 return;
 150                 break;
 151         }
 152         for (regs = 0; regs < numhashregs; regs++)
 153                 writel(mcfilterbits[regs],
 154                        ioaddr + GMAC_EXTHASH_BASE + regs * 4);
 155 }
 156
 157 static void dwmac1000_set_filter(struct mac_device_info *hw,
 158                                  struct net_device *dev)
 159 {
 160         void __iomem *ioaddr = (void __iomem *)dev->base_addr;
 161         unsigned int value = 0;
 162         unsigned int perfect_addr_number = hw->unicast_filter_entries;
 163         u32 mc_filter[8];
 164         int mcbitslog2 = hw->mcast_bits_log2;
 165
 166         pr_debug("%s: # mcasts %d, # unicast %d\n", __func__,
 167                  netdev_mc_count(dev), netdev_uc_count(dev));
 168
 169         memset(mc_filter, 0, sizeof(mc_filter));
 170
 171         if (dev->flags & IFF_PROMISC) {
 172                 value = GMAC_FRAME_FILTER_PR;
 173         } else if (dev->flags & IFF_ALLMULTI) {
 174                 value = GMAC_FRAME_FILTER_PM;   /* pass all multi */
 175         } else if (!netdev_mc_empty(dev)) {
 176                 struct netdev_hw_addr *ha;
 177
 178                 /* Hash filter for multicast */
 179                 value = GMAC_FRAME_FILTER_HMC;
 180
 181                 netdev_for_each_mc_addr(ha, dev) {
 182                         /* The upper n bits of the calculated CRC are used to
 183                          * index the contents of the hash table. The number of
 184                          * bits used depends on the hardware configuration
 185                          * selected at core configuration time.
 186                          */
 187                         int bit_nr = bitrev32(~crc32_le(~0, ha->addr,
 188                                               ETH_ALEN)) >>
 189                                               (32 - mcbitslog2);
 190                         /* The most significant bit determines the register to
 191                          * use (H/L) while the other 5 bits determine the bit
 192                          * within the register.
 193                          */
 194                         mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
 195                 }
 196         }
 197
 198         dwmac1000_set_mchash(ioaddr, mc_filter, mcbitslog2);
 199
 200         /* Handle multiple unicast addresses (perfect filtering) */
 201         if (netdev_uc_count(dev) > perfect_addr_number)
 202                 /* Switch to promiscuous mode if more than unicast
 203                  * addresses are requested than supported by hardware.
 204                  */
 205                 value |= GMAC_FRAME_FILTER_PR;
 206         else {
 207                 int reg = 1;
 208                 struct netdev_hw_addr *ha;
 209
 210                 netdev_for_each_uc_addr(ha, dev) {
 211                         stmmac_set_mac_addr(ioaddr, ha->addr,
 212                                             GMAC_ADDR_HIGH(reg),
 213                                             GMAC_ADDR_LOW(reg));
 214                         reg++;
 215                 }
 216         }
 217
 218 #ifdef FRAME_FILTER_DEBUG
 219         /* Enable Receive all mode (to debug filtering_fail errors) */
 220         value |= GMAC_FRAME_FILTER_RA;
 221 #endif
 222         writel(value, ioaddr + GMAC_FRAME_FILTER);
 223 }
 224
 225
 226 static void dwmac1000_flow_ctrl(struct mac_device_info *hw, unsigned int duplex,
 227                                 unsigned int fc, unsigned int pause_time)
 228 {
 229         void __iomem *ioaddr = hw->pcsr;
 230         /* Set flow such that DZPQ in Mac Register 6 is 0,
 231          * and unicast pause detect is enabled.
 232          */
 233         unsigned int flow = GMAC_FLOW_CTRL_UP;
 234
 235         pr_debug("GMAC Flow-Control:\n");
 236         if (fc & FLOW_RX) {
 237                 pr_debug("\tReceive Flow-Control ON\n");
 238                 flow |= GMAC_FLOW_CTRL_RFE;
 239         }
 240         if (fc & FLOW_TX) {
 241                 pr_debug("\tTransmit Flow-Control ON\n");
 242                 flow |= GMAC_FLOW_CTRL_TFE;
 243         }
 244
 245         if (duplex) {
 246                 pr_debug("\tduplex mode: PAUSE %d\n", pause_time);
 247                 flow |= (pause_time << GMAC_FLOW_CTRL_PT_SHIFT);
 248         }
 249
 250         writel(flow, ioaddr + GMAC_FLOW_CTRL);
 251 }
 252
 253 static void dwmac1000_pmt(struct mac_device_info *hw, unsigned long mode)
 254 {
 255         void __iomem *ioaddr = hw->pcsr;
 256         unsigned int pmt = 0;
 257
 258         if (mode & WAKE_MAGIC) {
 259                 pr_debug("GMAC: WOL Magic frame\n");
 260                 pmt |= power_down | magic_pkt_en;
 261         }
 262         if (mode & WAKE_UCAST) {
 263                 pr_debug("GMAC: WOL on global unicast\n");
 264                 pmt |= global_unicast;
 265         }
 266
 267         writel(pmt, ioaddr + GMAC_PMT);
 268 }
 269
 270 /* RGMII or SMII interface */
 271 static void dwmac1000_rgsmii(void __iomem *ioaddr, struct stmmac_extra_stats *x)
 272 {
 273         u32 status;
 274
 275         status = readl(ioaddr + GMAC_RGSMIIIS);
 276         x->irq_rgmii_n++;
 277
 278         /* Check the link status */
 279         if (status & GMAC_RGSMIIIS_LNKSTS) {
 280                 int speed_value;
 281
 282                 x->pcs_link = 1;
 283
 284                 speed_value = ((status & GMAC_RGSMIIIS_SPEED) >>
 285                                GMAC_RGSMIIIS_SPEED_SHIFT);
 286                 if (speed_value == GMAC_RGSMIIIS_SPEED_125)
 287                         x->pcs_speed = SPEED_1000;
 288                 else if (speed_value == GMAC_RGSMIIIS_SPEED_25)
 289                         x->pcs_speed = SPEED_100;
 290                 else
 291                         x->pcs_speed = SPEED_10;
 292
 293                 x->pcs_duplex = (status & GMAC_RGSMIIIS_LNKMOD_MASK);
 294
 295                 pr_info("Link is Up - %d/%s\n", (int)x->pcs_speed,
 296                         x->pcs_duplex ? "Full" : "Half");
 297         } else {
 298                 x->pcs_link = 0;
 299                 pr_info("Link is Down\n");
 300         }
 301 }
 302
 303 static int dwmac1000_irq_status(struct mac_device_info *hw,
 304                                 struct stmmac_extra_stats *x)
 305 {
 306         void __iomem *ioaddr = hw->pcsr;
 307         u32 intr_status = readl(ioaddr + GMAC_INT_STATUS);
 308         int ret = 0;
 309
 310         /* Not used events (e.g. MMC interrupts) are not handled. */
 311         if ((intr_status & GMAC_INT_STATUS_MMCTIS))
 312                 x->mmc_tx_irq_n++;
 313         if (unlikely(intr_status & GMAC_INT_STATUS_MMCRIS))
 314                 x->mmc_rx_irq_n++;
 315         if (unlikely(intr_status & GMAC_INT_STATUS_MMCCSUM))
 316                 x->mmc_rx_csum_offload_irq_n++;
 317         if (unlikely(intr_status & GMAC_INT_DISABLE_PMT)) {
 318                 /* clear the PMT bits 5 and 6 by reading the PMT status reg */
 319                 readl(ioaddr + GMAC_PMT);
 320                 x->irq_receive_pmt_irq_n++;
 321         }
 322
 323         /* MAC tx/rx EEE LPI entry/exit interrupts */
 324         if (intr_status & GMAC_INT_STATUS_LPIIS) {
 325                 /* Clean LPI interrupt by reading the Reg 12 */
 326                 ret = readl(ioaddr + LPI_CTRL_STATUS);
 327
 328                 if (ret & LPI_CTRL_STATUS_TLPIEN)
 329                         x->irq_tx_path_in_lpi_mode_n++;
 330                 if (ret & LPI_CTRL_STATUS_TLPIEX)
 331                         x->irq_tx_path_exit_lpi_mode_n++;
 332                 if (ret & LPI_CTRL_STATUS_RLPIEN)
 333                         x->irq_rx_path_in_lpi_mode_n++;
 334                 if (ret & LPI_CTRL_STATUS_RLPIEX)
 335                         x->irq_rx_path_exit_lpi_mode_n++;
 336         }
 337
 338         dwmac_pcs_isr(ioaddr, GMAC_PCS_BASE, intr_status, x);
 339
 340         if (intr_status & PCS_RGSMIIIS_IRQ)
 341                 dwmac1000_rgsmii(ioaddr, x);
 342
 343         return ret;
 344 }
 345
 346 static void dwmac1000_set_eee_mode(struct mac_device_info *hw)
 347 {
 348         void __iomem *ioaddr = hw->pcsr;
 349         u32 value;
 350
 351         /* Enable the link status receive on RGMII, SGMII ore SMII
 352          * receive path and instruct the transmit to enter in LPI
 353          * state.
 354          */
 355         value = readl(ioaddr + LPI_CTRL_STATUS);
 356         value |= LPI_CTRL_STATUS_LPIEN | LPI_CTRL_STATUS_LPITXA;
 357         writel(value, ioaddr + LPI_CTRL_STATUS);
 358 }
 359
 360 static void dwmac1000_reset_eee_mode(struct mac_device_info *hw)
 361 {
 362         void __iomem *ioaddr = hw->pcsr;
 363         u32 value;
 364
 365         value = readl(ioaddr + LPI_CTRL_STATUS);
 366         value &= ~(LPI_CTRL_STATUS_LPIEN | LPI_CTRL_STATUS_LPITXA);
 367         writel(value, ioaddr + LPI_CTRL_STATUS);
 368 }
 369
 370 static void dwmac1000_set_eee_pls(struct mac_device_info *hw, int link)
 371 {
 372         void __iomem *ioaddr = hw->pcsr;
 373         u32 value;
 374
 375         value = readl(ioaddr + LPI_CTRL_STATUS);
 376
 377         if (link)
 378                 value |= LPI_CTRL_STATUS_PLS;
 379         else
 380                 value &= ~LPI_CTRL_STATUS_PLS;
 381
 382         writel(value, ioaddr + LPI_CTRL_STATUS);
 383 }
 384
 385 static void dwmac1000_set_eee_timer(struct mac_device_info *hw, int ls, int tw)
 386 {
 387         void __iomem *ioaddr = hw->pcsr;
 388         int value = ((tw & 0xffff)) | ((ls & 0x7ff) << 16);
 389
 390         /* Program the timers in the LPI timer control register:
 391          * LS: minimum time (ms) for which the link
 392          *  status from PHY should be ok before transmitting
 393          *  the LPI pattern.
 394          * TW: minimum time (us) for which the core waits
 395          *  after it has stopped transmitting the LPI pattern.
 396          */
 397         writel(value, ioaddr + LPI_TIMER_CTRL);
 398 }
 399
 400 static void dwmac1000_ctrl_ane(void __iomem *ioaddr, bool ane, bool srgmi_ral,
 401                                bool loopback)
 402 {
 403         dwmac_ctrl_ane(ioaddr, GMAC_PCS_BASE, ane, srgmi_ral, loopback);
 404 }
 405
 406 static void dwmac1000_rane(void __iomem *ioaddr, bool restart)
 407 {
 408         dwmac_rane(ioaddr, GMAC_PCS_BASE, restart);
 409 }
 410
 411 static void dwmac1000_get_adv_lp(void __iomem *ioaddr, struct rgmii_adv *adv)
 412 {
 413         dwmac_get_adv_lp(ioaddr, GMAC_PCS_BASE, adv);
 414 }
 415
 416 static void dwmac1000_debug(void __iomem *ioaddr, struct stmmac_extra_stats *x)
 417 {
 418         u32 value = readl(ioaddr + GMAC_DEBUG);
 419
 420         if (value & GMAC_DEBUG_TXSTSFSTS)
 421                 x->mtl_tx_status_fifo_full++;
 422         if (value & GMAC_DEBUG_TXFSTS)
 423                 x->mtl_tx_fifo_not_empty++;
 424         if (value & GMAC_DEBUG_TWCSTS)
 425                 x->mmtl_fifo_ctrl++;
 426         if (value & GMAC_DEBUG_TRCSTS_MASK) {
 427                 u32 trcsts = (value & GMAC_DEBUG_TRCSTS_MASK)
 428                              >> GMAC_DEBUG_TRCSTS_SHIFT;
 429                 if (trcsts == GMAC_DEBUG_TRCSTS_WRITE)
 430                         x->mtl_tx_fifo_read_ctrl_write++;
 431                 else if (trcsts == GMAC_DEBUG_TRCSTS_TXW)
 432                         x->mtl_tx_fifo_read_ctrl_wait++;
 433                 else if (trcsts == GMAC_DEBUG_TRCSTS_READ)
 434                         x->mtl_tx_fifo_read_ctrl_read++;
 435                 else
 436                         x->mtl_tx_fifo_read_ctrl_idle++;
 437         }
 438         if (value & GMAC_DEBUG_TXPAUSED)
 439                 x->mac_tx_in_pause++;
 440         if (value & GMAC_DEBUG_TFCSTS_MASK) {
 441                 u32 tfcsts = (value & GMAC_DEBUG_TFCSTS_MASK)
 442                               >> GMAC_DEBUG_TFCSTS_SHIFT;
 443
 444                 if (tfcsts == GMAC_DEBUG_TFCSTS_XFER)
 445                         x->mac_tx_frame_ctrl_xfer++;
 446                 else if (tfcsts == GMAC_DEBUG_TFCSTS_GEN_PAUSE)
 447                         x->mac_tx_frame_ctrl_pause++;
 448                 else if (tfcsts == GMAC_DEBUG_TFCSTS_WAIT)
 449                         x->mac_tx_frame_ctrl_wait++;
 450                 else
 451                         x->mac_tx_frame_ctrl_idle++;
 452         }
 453         if (value & GMAC_DEBUG_TPESTS)
 454                 x->mac_gmii_tx_proto_engine++;
 455         if (value & GMAC_DEBUG_RXFSTS_MASK) {
 456                 u32 rxfsts = (value & GMAC_DEBUG_RXFSTS_MASK)
 457                              >> GMAC_DEBUG_RRCSTS_SHIFT;
 458
 459                 if (rxfsts == GMAC_DEBUG_RXFSTS_FULL)
 460                         x->mtl_rx_fifo_fill_level_full++;
 461                 else if (rxfsts == GMAC_DEBUG_RXFSTS_AT)
 462                         x->mtl_rx_fifo_fill_above_thresh++;
 463                 else if (rxfsts == GMAC_DEBUG_RXFSTS_BT)
 464                         x->mtl_rx_fifo_fill_below_thresh++;
 465                 else
 466                         x->mtl_rx_fifo_fill_level_empty++;
 467         }
 468         if (value & GMAC_DEBUG_RRCSTS_MASK) {
 469                 u32 rrcsts = (value & GMAC_DEBUG_RRCSTS_MASK) >>
 470                              GMAC_DEBUG_RRCSTS_SHIFT;
 471
 472                 if (rrcsts == GMAC_DEBUG_RRCSTS_FLUSH)
 473                         x->mtl_rx_fifo_read_ctrl_flush++;
 474                 else if (rrcsts == GMAC_DEBUG_RRCSTS_RSTAT)
 475                         x->mtl_rx_fifo_read_ctrl_read_data++;
 476                 else if (rrcsts == GMAC_DEBUG_RRCSTS_RDATA)
 477                         x->mtl_rx_fifo_read_ctrl_status++;
 478                 else
 479                         x->mtl_rx_fifo_read_ctrl_idle++;
 480         }
 481         if (value & GMAC_DEBUG_RWCSTS)
 482                 x->mtl_rx_fifo_ctrl_active++;
 483         if (value & GMAC_DEBUG_RFCFCSTS_MASK)
 484                 x->mac_rx_frame_ctrl_fifo = (value & GMAC_DEBUG_RFCFCSTS_MASK)
 485                                             >> GMAC_DEBUG_RFCFCSTS_SHIFT;
 486         if (value & GMAC_DEBUG_RPESTS)
 487                 x->mac_gmii_rx_proto_engine++;
 488 }
 489
 490 static const struct stmmac_ops dwmac1000_ops = {
 491         .core_init = dwmac1000_core_init,
 492         .rx_ipc = dwmac1000_rx_ipc_enable,
 493         .dump_regs = dwmac1000_dump_regs,
 494         .host_irq_status = dwmac1000_irq_status,
 495         .set_filter = dwmac1000_set_filter,
 496         .flow_ctrl = dwmac1000_flow_ctrl,
 497         .pmt = dwmac1000_pmt,
 498         .set_umac_addr = dwmac1000_set_umac_addr,
 499         .get_umac_addr = dwmac1000_get_umac_addr,
 500         .set_eee_mode = dwmac1000_set_eee_mode,
 501         .reset_eee_mode = dwmac1000_reset_eee_mode,
 502         .set_eee_timer = dwmac1000_set_eee_timer,
 503         .set_eee_pls = dwmac1000_set_eee_pls,
 504         .debug = dwmac1000_debug,
 505         .pcs_ctrl_ane = dwmac1000_ctrl_ane,
 506         .pcs_rane = dwmac1000_rane,
 507         .pcs_get_adv_lp = dwmac1000_get_adv_lp,
 508 };
 509
 510 struct mac_device_info *dwmac1000_setup(void __iomem *ioaddr, int mcbins,
 511                                         int perfect_uc_entries,
 512                                         int *synopsys_id)
 513 {
 514         struct mac_device_info *mac;
 515         u32 hwid = readl(ioaddr + GMAC_VERSION);
 516
 517         mac = kzalloc(sizeof(const struct mac_device_info), GFP_KERNEL);
 518         if (!mac)
 519                 return NULL;
 520
 521         mac->pcsr = ioaddr;
 522         mac->multicast_filter_bins = mcbins;
 523         mac->unicast_filter_entries = perfect_uc_entries;
 524         mac->mcast_bits_log2 = 0;
 525
 526         if (mac->multicast_filter_bins)
 527                 mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
 528
 529         mac->mac = &dwmac1000_ops;
 530         mac->dma = &dwmac1000_dma_ops;
 531
 532         mac->link.port = GMAC_CONTROL_PS;
 533         mac->link.duplex = GMAC_CONTROL_DM;
 534         mac->link.speed = GMAC_CONTROL_FES;
 535         mac->mii.addr = GMAC_MII_ADDR;
 536         mac->mii.data = GMAC_MII_DATA;
 537
 538         /* Get and dump the chip ID */
 539         *synopsys_id = stmmac_get_synopsys_id(hwid);
 540
 541         return mac;
 542 }