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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*******************************************************************************
   3   This contains the functions to handle the platform driver.
   4
   5   Copyright (C) 2007-2011  STMicroelectronics Ltd
   6
   7
   8   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
   9 *******************************************************************************/
  10
  11 #include <linux/platform_device.h>
  12 #include <linux/module.h>
  13 #include <linux/io.h>
  14 #include <linux/of.h>
  15 #include <linux/of_net.h>
  16 #include <linux/of_device.h>
  17 #include <linux/of_mdio.h>
  18
  19 #include "stmmac.h"
  20 #include "stmmac_platform.h"
  21
  22 #ifdef CONFIG_OF
  23
  24 /**
  25  * dwmac1000_validate_mcast_bins - validates the number of Multicast filter bins
  26  * @mcast_bins: Multicast filtering bins
  27  * Description:
  28  * this function validates the number of Multicast filtering bins specified
  29  * by the configuration through the device tree. The Synopsys GMAC supports
  30  * 64 bins, 128 bins, or 256 bins. "bins" refer to the division of CRC
  31  * number space. 64 bins correspond to 6 bits of the CRC, 128 corresponds
  32  * to 7 bits, and 256 refers to 8 bits of the CRC. Any other setting is
  33  * invalid and will cause the filtering algorithm to use Multicast
  34  * promiscuous mode.
  35  */
  36 static int dwmac1000_validate_mcast_bins(int mcast_bins)
  37 {
  38         int x = mcast_bins;
  39
  40         switch (x) {
  41         case HASH_TABLE_SIZE:
  42         case 128:
  43         case 256:
  44                 break;
  45         default:
  46                 x = 0;
  47                 pr_info("Hash table entries set to unexpected value %d",
  48                         mcast_bins);
  49                 break;
  50         }
  51         return x;
  52 }
  53
  54 /**
  55  * dwmac1000_validate_ucast_entries - validate the Unicast address entries
  56  * @ucast_entries: number of Unicast address entries
  57  * Description:
  58  * This function validates the number of Unicast address entries supported
  59  * by a particular Synopsys 10/100/1000 controller. The Synopsys controller
  60  * supports 1..32, 64, or 128 Unicast filter entries for it's Unicast filter
  61  * logic. This function validates a valid, supported configuration is
  62  * selected, and defaults to 1 Unicast address if an unsupported
  63  * configuration is selected.
  64  */
  65 static int dwmac1000_validate_ucast_entries(int ucast_entries)
  66 {
  67         int x = ucast_entries;
  68
  69         switch (x) {
  70         case 1 ... 32:
  71         case 64:
  72         case 128:
  73                 break;
  74         default:
  75                 x = 1;
  76                 pr_info("Unicast table entries set to unexpected value %d\n",
  77                         ucast_entries);
  78                 break;
  79         }
  80         return x;
  81 }
  82
  83 /**
  84  * stmmac_axi_setup - parse DT parameters for programming the AXI register
  85  * @pdev: platform device
  86  * Description:
  87  * if required, from device-tree the AXI internal register can be tuned
  88  * by using platform parameters.
  89  */
  90 static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev)
  91 {
  92         struct device_node *np;
  93         struct stmmac_axi *axi;
  94
  95         np = of_parse_phandle(pdev->dev.of_node, "snps,axi-config", 0);
  96         if (!np)
  97                 return NULL;
  98
  99         axi = devm_kzalloc(&pdev->dev, sizeof(*axi), GFP_KERNEL);
 100         if (!axi) {
 101                 of_node_put(np);
 102                 return ERR_PTR(-ENOMEM);
 103         }
 104
 105         axi->axi_lpi_en = of_property_read_bool(np, "snps,lpi_en");
 106         axi->axi_xit_frm = of_property_read_bool(np, "snps,xit_frm");
 107         axi->axi_kbbe = of_property_read_bool(np, "snps,axi_kbbe");
 108         axi->axi_fb = of_property_read_bool(np, "snps,axi_fb");
 109         axi->axi_mb = of_property_read_bool(np, "snps,axi_mb");
 110         axi->axi_rb =  of_property_read_bool(np, "snps,axi_rb");
 111
 112         if (of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt))
 113                 axi->axi_wr_osr_lmt = 1;
 114         if (of_property_read_u32(np, "snps,rd_osr_lmt", &axi->axi_rd_osr_lmt))
 115                 axi->axi_rd_osr_lmt = 1;
 116         of_property_read_u32_array(np, "snps,blen", axi->axi_blen, AXI_BLEN);
 117         of_node_put(np);
 118
 119         return axi;
 120 }
 121
 122 /**
 123  * stmmac_mtl_setup - parse DT parameters for multiple queues configuration
 124  * @pdev: platform device
 125  */
 126 static int stmmac_mtl_setup(struct platform_device *pdev,
 127                             struct plat_stmmacenet_data *plat)
 128 {
 129         struct device_node *q_node;
 130         struct device_node *rx_node;
 131         struct device_node *tx_node;
 132         u8 queue = 0;
 133         int ret = 0;
 134
 135         /* For backwards-compatibility with device trees that don't have any
 136          * snps,mtl-rx-config or snps,mtl-tx-config properties, we fall back
 137          * to one RX and TX queues each.
 138          */
 139         plat->rx_queues_to_use = 1;
 140         plat->tx_queues_to_use = 1;
 141
 142         /* First Queue must always be in DCB mode. As MTL_QUEUE_DCB = 1 we need
 143          * to always set this, otherwise Queue will be classified as AVB
 144          * (because MTL_QUEUE_AVB = 0).
 145          */
 146         plat->rx_queues_cfg[0].mode_to_use = MTL_QUEUE_DCB;
 147         plat->tx_queues_cfg[0].mode_to_use = MTL_QUEUE_DCB;
 148
 149         rx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-rx-config", 0);
 150         if (!rx_node)
 151                 return ret;
 152
 153         tx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-tx-config", 0);
 154         if (!tx_node) {
 155                 of_node_put(rx_node);
 156                 return ret;
 157         }
 158
 159         /* Processing RX queues common config */
 160         if (of_property_read_u32(rx_node, "snps,rx-queues-to-use",
 161                                  &plat->rx_queues_to_use))
 162                 plat->rx_queues_to_use = 1;
 163
 164         if (of_property_read_bool(rx_node, "snps,rx-sched-sp"))
 165                 plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;
 166         else if (of_property_read_bool(rx_node, "snps,rx-sched-wsp"))
 167                 plat->rx_sched_algorithm = MTL_RX_ALGORITHM_WSP;
 168         else
 169                 plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;
 170
 171         /* Processing individual RX queue config */
 172         for_each_child_of_node(rx_node, q_node) {
 173                 if (queue >= plat->rx_queues_to_use)
 174                         break;
 175
 176                 if (of_property_read_bool(q_node, "snps,dcb-algorithm"))
 177                         plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
 178                 else if (of_property_read_bool(q_node, "snps,avb-algorithm"))
 179                         plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_AVB;
 180                 else
 181                         plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
 182
 183                 if (of_property_read_u32(q_node, "snps,map-to-dma-channel",
 184                                          &plat->rx_queues_cfg[queue].chan))
 185                         plat->rx_queues_cfg[queue].chan = queue;
 186                 /* TODO: Dynamic mapping to be included in the future */
 187
 188                 if (of_property_read_u32(q_node, "snps,priority",
 189                                         &plat->rx_queues_cfg[queue].prio)) {
 190                         plat->rx_queues_cfg[queue].prio = 0;
 191                         plat->rx_queues_cfg[queue].use_prio = false;
 192                 } else {
 193                         plat->rx_queues_cfg[queue].use_prio = true;
 194                 }
 195
 196                 /* RX queue specific packet type routing */
 197                 if (of_property_read_bool(q_node, "snps,route-avcp"))
 198                         plat->rx_queues_cfg[queue].pkt_route = PACKET_AVCPQ;
 199                 else if (of_property_read_bool(q_node, "snps,route-ptp"))
 200                         plat->rx_queues_cfg[queue].pkt_route = PACKET_PTPQ;
 201                 else if (of_property_read_bool(q_node, "snps,route-dcbcp"))
 202                         plat->rx_queues_cfg[queue].pkt_route = PACKET_DCBCPQ;
 203                 else if (of_property_read_bool(q_node, "snps,route-up"))
 204                         plat->rx_queues_cfg[queue].pkt_route = PACKET_UPQ;
 205                 else if (of_property_read_bool(q_node, "snps,route-multi-broad"))
 206                         plat->rx_queues_cfg[queue].pkt_route = PACKET_MCBCQ;
 207                 else
 208                         plat->rx_queues_cfg[queue].pkt_route = 0x0;
 209
 210                 queue++;
 211         }
 212         if (queue != plat->rx_queues_to_use) {
 213                 ret = -EINVAL;
 214                 dev_err(&pdev->dev, "Not all RX queues were configured\n");
 215                 goto out;
 216         }
 217
 218         /* Processing TX queues common config */
 219         if (of_property_read_u32(tx_node, "snps,tx-queues-to-use",
 220                                  &plat->tx_queues_to_use))
 221                 plat->tx_queues_to_use = 1;
 222
 223         if (of_property_read_bool(tx_node, "snps,tx-sched-wrr"))
 224                 plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WRR;
 225         else if (of_property_read_bool(tx_node, "snps,tx-sched-wfq"))
 226                 plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WFQ;
 227         else if (of_property_read_bool(tx_node, "snps,tx-sched-dwrr"))
 228                 plat->tx_sched_algorithm = MTL_TX_ALGORITHM_DWRR;
 229         else if (of_property_read_bool(tx_node, "snps,tx-sched-sp"))
 230                 plat->tx_sched_algorithm = MTL_TX_ALGORITHM_SP;
 231         else
 232                 plat->tx_sched_algorithm = MTL_TX_ALGORITHM_SP;
 233
 234         queue = 0;
 235
 236         /* Processing individual TX queue config */
 237         for_each_child_of_node(tx_node, q_node) {
 238                 if (queue >= plat->tx_queues_to_use)
 239                         break;
 240
 241                 if (of_property_read_u32(q_node, "snps,weight",
 242                                          &plat->tx_queues_cfg[queue].weight))
 243                         plat->tx_queues_cfg[queue].weight = 0x10 + queue;
 244
 245                 if (of_property_read_bool(q_node, "snps,dcb-algorithm")) {
 246                         plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
 247                 } else if (of_property_read_bool(q_node,
 248                                                  "snps,avb-algorithm")) {
 249                         plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_AVB;
 250
 251                         /* Credit Base Shaper parameters used by AVB */
 252                         if (of_property_read_u32(q_node, "snps,send_slope",
 253                                 &plat->tx_queues_cfg[queue].send_slope))
 254                                 plat->tx_queues_cfg[queue].send_slope = 0x0;
 255                         if (of_property_read_u32(q_node, "snps,idle_slope",
 256                                 &plat->tx_queues_cfg[queue].idle_slope))
 257                                 plat->tx_queues_cfg[queue].idle_slope = 0x0;
 258                         if (of_property_read_u32(q_node, "snps,high_credit",
 259                                 &plat->tx_queues_cfg[queue].high_credit))
 260                                 plat->tx_queues_cfg[queue].high_credit = 0x0;
 261                         if (of_property_read_u32(q_node, "snps,low_credit",
 262                                 &plat->tx_queues_cfg[queue].low_credit))
 263                                 plat->tx_queues_cfg[queue].low_credit = 0x0;
 264                 } else {
 265                         plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
 266                 }
 267
 268                 if (of_property_read_u32(q_node, "snps,priority",
 269                                         &plat->tx_queues_cfg[queue].prio)) {
 270                         plat->tx_queues_cfg[queue].prio = 0;
 271                         plat->tx_queues_cfg[queue].use_prio = false;
 272                 } else {
 273                         plat->tx_queues_cfg[queue].use_prio = true;
 274                 }
 275
 276                 queue++;
 277         }
 278         if (queue != plat->tx_queues_to_use) {
 279                 ret = -EINVAL;
 280                 dev_err(&pdev->dev, "Not all TX queues were configured\n");
 281                 goto out;
 282         }
 283
 284 out:
 285         of_node_put(rx_node);
 286         of_node_put(tx_node);
 287         of_node_put(q_node);
 288
 289         return ret;
 290 }
 291
 292 /**
 293  * stmmac_dt_phy - parse device-tree driver parameters to allocate PHY resources
 294  * @plat: driver data platform structure
 295  * @np: device tree node
 296  * @dev: device pointer
 297  * Description:
 298  * The mdio bus will be allocated in case of a phy transceiver is on board;
 299  * it will be NULL if the fixed-link is configured.
 300  * If there is the "snps,dwmac-mdio" sub-node the mdio will be allocated
 301  * in any case (for DSA, mdio must be registered even if fixed-link).
 302  * The table below sums the supported configurations:
 303  *      -------------------------------
 304  *      snps,phy-addr   |     Y
 305  *      -------------------------------
 306  *      phy-handle      |     Y
 307  *      -------------------------------
 308  *      fixed-link      |     N
 309  *      -------------------------------
 310  *      snps,dwmac-mdio |
 311  *        even if       |     Y
 312  *      fixed-link      |
 313  *      -------------------------------
 314  *
 315  * It returns 0 in case of success otherwise -ENODEV.
 316  */
 317 static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
 318                          struct device_node *np, struct device *dev)
 319 {
 320         bool mdio = true;
 321         static const struct of_device_id need_mdio_ids[] = {
 322                 { .compatible = "snps,dwc-qos-ethernet-4.10" },
 323                 {},
 324         };
 325
 326         if (of_match_node(need_mdio_ids, np)) {
 327                 plat->mdio_node = of_get_child_by_name(np, "mdio");
 328         } else {
 329                 /**
 330                  * If snps,dwmac-mdio is passed from DT, always register
 331                  * the MDIO
 332                  */
 333                 for_each_child_of_node(np, plat->mdio_node) {
 334                         if (of_device_is_compatible(plat->mdio_node,
 335                                                     "snps,dwmac-mdio"))
 336                                 break;
 337                 }
 338         }
 339
 340         if (plat->mdio_node) {
 341                 dev_dbg(dev, "Found MDIO subnode\n");
 342                 mdio = true;
 343         }
 344
 345         if (mdio)
 346                 plat->mdio_bus_data =
 347                         devm_kzalloc(dev, sizeof(struct stmmac_mdio_bus_data),
 348                                      GFP_KERNEL);
 349         return 0;
 350 }
 351
 352 /**
 353  * stmmac_probe_config_dt - parse device-tree driver parameters
 354  * @pdev: platform_device structure
 355  * @mac: MAC address to use
 356  * Description:
 357  * this function is to read the driver parameters from device-tree and
 358  * set some private fields that will be used by the main at runtime.
 359  */
 360 struct plat_stmmacenet_data *
 361 stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 362 {
 363         struct device_node *np = pdev->dev.of_node;
 364         struct plat_stmmacenet_data *plat;
 365         struct stmmac_dma_cfg *dma_cfg;
 366         int rc;
 367
 368         plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
 369         if (!plat)
 370                 return ERR_PTR(-ENOMEM);
 371
 372         *mac = of_get_mac_address(np);
 373         plat->interface = of_get_phy_mode(np);
 374
 375         /* Some wrapper drivers still rely on phy_node. Let's save it while
 376          * they are not converted to phylink. */
 377         plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
 378
 379         /* PHYLINK automatically parses the phy-handle property */
 380         plat->phylink_node = np;
 381
 382         /* Get max speed of operation from device tree */
 383         if (of_property_read_u32(np, "max-speed", &plat->max_speed))
 384                 plat->max_speed = -1;
 385
 386         plat->bus_id = of_alias_get_id(np, "ethernet");
 387         if (plat->bus_id < 0)
 388                 plat->bus_id = 0;
 389
 390         /* Default to phy auto-detection */
 391         plat->phy_addr = -1;
 392
 393         /* Default to get clk_csr from stmmac_clk_crs_set(),
 394          * or get clk_csr from device tree.
 395          */
 396         plat->clk_csr = -1;
 397         of_property_read_u32(np, "clk_csr", &plat->clk_csr);
 398
 399         /* "snps,phy-addr" is not a standard property. Mark it as deprecated
 400          * and warn of its use. Remove this when phy node support is added.
 401          */
 402         if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
 403                 dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
 404
 405         /* To Configure PHY by using all device-tree supported properties */
 406         rc = stmmac_dt_phy(plat, np, &pdev->dev);
 407         if (rc)
 408                 return ERR_PTR(rc);
 409
 410         of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
 411
 412         of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);
 413
 414         plat->force_sf_dma_mode =
 415                 of_property_read_bool(np, "snps,force_sf_dma_mode");
 416
 417         plat->en_tx_lpi_clockgating =
 418                 of_property_read_bool(np, "snps,en-tx-lpi-clockgating");
 419
 420         /* Set the maxmtu to a default of JUMBO_LEN in case the
 421          * parameter is not present in the device tree.
 422          */
 423         plat->maxmtu = JUMBO_LEN;
 424
 425         /* Set default value for multicast hash bins */
 426         plat->multicast_filter_bins = HASH_TABLE_SIZE;
 427
 428         /* Set default value for unicast filter entries */
 429         plat->unicast_filter_entries = 1;
 430
 431         /*
 432          * Currently only the properties needed on SPEAr600
 433          * are provided. All other properties should be added
 434          * once needed on other platforms.
 435          */
 436         if (of_device_is_compatible(np, "st,spear600-gmac") ||
 437                 of_device_is_compatible(np, "snps,dwmac-3.50a") ||
 438                 of_device_is_compatible(np, "snps,dwmac-3.70a") ||
 439                 of_device_is_compatible(np, "snps,dwmac")) {
 440                 /* Note that the max-frame-size parameter as defined in the
 441                  * ePAPR v1.1 spec is defined as max-frame-size, it's
 442                  * actually used as the IEEE definition of MAC Client
 443                  * data, or MTU. The ePAPR specification is confusing as
 444                  * the definition is max-frame-size, but usage examples
 445                  * are clearly MTUs
 446                  */
 447                 of_property_read_u32(np, "max-frame-size", &plat->maxmtu);
 448                 of_property_read_u32(np, "snps,multicast-filter-bins",
 449                                      &plat->multicast_filter_bins);
 450                 of_property_read_u32(np, "snps,perfect-filter-entries",
 451                                      &plat->unicast_filter_entries);
 452                 plat->unicast_filter_entries = dwmac1000_validate_ucast_entries(
 453                                                plat->unicast_filter_entries);
 454                 plat->multicast_filter_bins = dwmac1000_validate_mcast_bins(
 455                                               plat->multicast_filter_bins);
 456                 plat->has_gmac = 1;
 457                 plat->pmt = 1;
 458         }
 459
 460         if (of_device_is_compatible(np, "snps,dwmac-4.00") ||
 461             of_device_is_compatible(np, "snps,dwmac-4.10a") ||
 462             of_device_is_compatible(np, "snps,dwmac-4.20a")) {
 463                 plat->has_gmac4 = 1;
 464                 plat->has_gmac = 0;
 465                 plat->pmt = 1;
 466                 plat->tso_en = of_property_read_bool(np, "snps,tso");
 467         }
 468
 469         if (of_device_is_compatible(np, "snps,dwmac-3.610") ||
 470                 of_device_is_compatible(np, "snps,dwmac-3.710")) {
 471                 plat->enh_desc = 1;
 472                 plat->bugged_jumbo = 1;
 473                 plat->force_sf_dma_mode = 1;
 474         }
 475
 476         if (of_device_is_compatible(np, "snps,dwxgmac")) {
 477                 plat->has_xgmac = 1;
 478                 plat->pmt = 1;
 479                 plat->tso_en = of_property_read_bool(np, "snps,tso");
 480         }
 481
 482         dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
 483                                GFP_KERNEL);
 484         if (!dma_cfg) {
 485                 stmmac_remove_config_dt(pdev, plat);
 486                 return ERR_PTR(-ENOMEM);
 487         }
 488         plat->dma_cfg = dma_cfg;
 489
 490         of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
 491         if (!dma_cfg->pbl)
 492                 dma_cfg->pbl = DEFAULT_DMA_PBL;
 493         of_property_read_u32(np, "snps,txpbl", &dma_cfg->txpbl);
 494         of_property_read_u32(np, "snps,rxpbl", &dma_cfg->rxpbl);
 495         dma_cfg->pblx8 = !of_property_read_bool(np, "snps,no-pbl-x8");
 496
 497         dma_cfg->aal = of_property_read_bool(np, "snps,aal");
 498         dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst");
 499         dma_cfg->mixed_burst = of_property_read_bool(np, "snps,mixed-burst");
 500
 501         plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
 502         if (plat->force_thresh_dma_mode) {
 503                 plat->force_sf_dma_mode = 0;
 504                 pr_warn("force_sf_dma_mode is ignored if force_thresh_dma_mode is set.");
 505         }
 506
 507         of_property_read_u32(np, "snps,ps-speed", &plat->mac_port_sel_speed);
 508
 509         plat->axi = stmmac_axi_setup(pdev);
 510
 511         rc = stmmac_mtl_setup(pdev, plat);
 512         if (rc) {
 513                 stmmac_remove_config_dt(pdev, plat);
 514                 return ERR_PTR(rc);
 515         }
 516
 517         /* clock setup */
 518         plat->stmmac_clk = devm_clk_get(&pdev->dev,
 519                                         STMMAC_RESOURCE_NAME);
 520         if (IS_ERR(plat->stmmac_clk)) {
 521                 dev_warn(&pdev->dev, "Cannot get CSR clock\n");
 522                 plat->stmmac_clk = NULL;
 523         }
 524         clk_prepare_enable(plat->stmmac_clk);
 525
 526         plat->pclk = devm_clk_get(&pdev->dev, "pclk");
 527         if (IS_ERR(plat->pclk)) {
 528                 if (PTR_ERR(plat->pclk) == -EPROBE_DEFER)
 529                         goto error_pclk_get;
 530
 531                 plat->pclk = NULL;
 532         }
 533         clk_prepare_enable(plat->pclk);
 534
 535         /* Fall-back to main clock in case of no PTP ref is passed */
 536         plat->clk_ptp_ref = devm_clk_get(&pdev->dev, "ptp_ref");
 537         if (IS_ERR(plat->clk_ptp_ref)) {
 538                 plat->clk_ptp_rate = clk_get_rate(plat->stmmac_clk);
 539                 plat->clk_ptp_ref = NULL;
 540                 dev_warn(&pdev->dev, "PTP uses main clock\n");
 541         } else {
 542                 plat->clk_ptp_rate = clk_get_rate(plat->clk_ptp_ref);
 543                 dev_dbg(&pdev->dev, "PTP rate %d\n", plat->clk_ptp_rate);
 544         }
 545
 546         plat->stmmac_rst = devm_reset_control_get(&pdev->dev,
 547                                                   STMMAC_RESOURCE_NAME);
 548         if (IS_ERR(plat->stmmac_rst)) {
 549                 if (PTR_ERR(plat->stmmac_rst) == -EPROBE_DEFER)
 550                         goto error_hw_init;
 551
 552                 dev_info(&pdev->dev, "no reset control found\n");
 553                 plat->stmmac_rst = NULL;
 554         }
 555
 556         return plat;
 557
 558 error_hw_init:
 559         clk_disable_unprepare(plat->pclk);
 560 error_pclk_get:
 561         clk_disable_unprepare(plat->stmmac_clk);
 562
 563         return ERR_PTR(-EPROBE_DEFER);
 564 }
 565
 566 /**
 567  * stmmac_remove_config_dt - undo the effects of stmmac_probe_config_dt()
 568  * @pdev: platform_device structure
 569  * @plat: driver data platform structure
 570  *
 571  * Release resources claimed by stmmac_probe_config_dt().
 572  */
 573 void stmmac_remove_config_dt(struct platform_device *pdev,
 574                              struct plat_stmmacenet_data *plat)
 575 {
 576         of_node_put(plat->phy_node);
 577         of_node_put(plat->mdio_node);
 578 }
 579 #else
 580 struct plat_stmmacenet_data *
 581 stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 582 {
 583         return ERR_PTR(-EINVAL);
 584 }
 585
 586 void stmmac_remove_config_dt(struct platform_device *pdev,
 587                              struct plat_stmmacenet_data *plat)
 588 {
 589 }
 590 #endif /* CONFIG_OF */
 591 EXPORT_SYMBOL_GPL(stmmac_probe_config_dt);
 592 EXPORT_SYMBOL_GPL(stmmac_remove_config_dt);
 593
 594 int stmmac_get_platform_resources(struct platform_device *pdev,
 595                                   struct stmmac_resources *stmmac_res)
 596 {
 597         struct resource *res;
 598
 599         memset(stmmac_res, 0, sizeof(*stmmac_res));
 600
 601         /* Get IRQ information early to have an ability to ask for deferred
 602          * probe if needed before we went too far with resource allocation.
 603          */
 604         stmmac_res->irq = platform_get_irq_byname(pdev, "macirq");
 605         if (stmmac_res->irq < 0) {
 606                 if (stmmac_res->irq != -EPROBE_DEFER) {
 607                         dev_err(&pdev->dev,
 608                                 "MAC IRQ configuration information not found\n");
 609                 }
 610                 return stmmac_res->irq;
 611         }
 612
 613         /* On some platforms e.g. SPEAr the wake up irq differs from the mac irq
 614          * The external wake up irq can be passed through the platform code
 615          * named as "eth_wake_irq"
 616          *
 617          * In case the wake up interrupt is not passed from the platform
 618          * so the driver will continue to use the mac irq (ndev->irq)
 619          */
 620         stmmac_res->wol_irq = platform_get_irq_byname(pdev, "eth_wake_irq");
 621         if (stmmac_res->wol_irq < 0) {
 622                 if (stmmac_res->wol_irq == -EPROBE_DEFER)
 623                         return -EPROBE_DEFER;
 624                 stmmac_res->wol_irq = stmmac_res->irq;
 625         }
 626
 627         stmmac_res->lpi_irq = platform_get_irq_byname(pdev, "eth_lpi");
 628         if (stmmac_res->lpi_irq == -EPROBE_DEFER)
 629                 return -EPROBE_DEFER;
 630
 631         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 632         stmmac_res->addr = devm_ioremap_resource(&pdev->dev, res);
 633
 634         return PTR_ERR_OR_ZERO(stmmac_res->addr);
 635 }
 636 EXPORT_SYMBOL_GPL(stmmac_get_platform_resources);
 637
 638 /**
 639  * stmmac_pltfr_remove
 640  * @pdev: platform device pointer
 641  * Description: this function calls the main to free the net resources
 642  * and calls the platforms hook and release the resources (e.g. mem).
 643  */
 644 int stmmac_pltfr_remove(struct platform_device *pdev)
 645 {
 646         struct net_device *ndev = platform_get_drvdata(pdev);
 647         struct stmmac_priv *priv = netdev_priv(ndev);
 648         struct plat_stmmacenet_data *plat = priv->plat;
 649         int ret = stmmac_dvr_remove(&pdev->dev);
 650
 651         if (plat->exit)
 652                 plat->exit(pdev, plat->bsp_priv);
 653
 654         stmmac_remove_config_dt(pdev, plat);
 655
 656         return ret;
 657 }
 658 EXPORT_SYMBOL_GPL(stmmac_pltfr_remove);
 659
 660 #ifdef CONFIG_PM_SLEEP
 661 /**
 662  * stmmac_pltfr_suspend
 663  * @dev: device pointer
 664  * Description: this function is invoked when suspend the driver and it direcly
 665  * call the main suspend function and then, if required, on some platform, it
 666  * can call an exit helper.
 667  */
 668 static int stmmac_pltfr_suspend(struct device *dev)
 669 {
 670         int ret;
 671         struct net_device *ndev = dev_get_drvdata(dev);
 672         struct stmmac_priv *priv = netdev_priv(ndev);
 673         struct platform_device *pdev = to_platform_device(dev);
 674
 675         ret = stmmac_suspend(dev);
 676         if (priv->plat->exit)
 677                 priv->plat->exit(pdev, priv->plat->bsp_priv);
 678
 679         return ret;
 680 }
 681
 682 /**
 683  * stmmac_pltfr_resume
 684  * @dev: device pointer
 685  * Description: this function is invoked when resume the driver before calling
 686  * the main resume function, on some platforms, it can call own init helper
 687  * if required.
 688  */
 689 static int stmmac_pltfr_resume(struct device *dev)
 690 {
 691         struct net_device *ndev = dev_get_drvdata(dev);
 692         struct stmmac_priv *priv = netdev_priv(ndev);
 693         struct platform_device *pdev = to_platform_device(dev);
 694
 695         if (priv->plat->init)
 696                 priv->plat->init(pdev, priv->plat->bsp_priv);
 697
 698         return stmmac_resume(dev);
 699 }
 700 #endif /* CONFIG_PM_SLEEP */
 701
 702 SIMPLE_DEV_PM_OPS(stmmac_pltfr_pm_ops, stmmac_pltfr_suspend,
 703                                        stmmac_pltfr_resume);
 704 EXPORT_SYMBOL_GPL(stmmac_pltfr_pm_ops);
 705
 706 MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet platform support");
 707 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
 708 MODULE_LICENSE("GPL");