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

   1 /*******************************************************************************
   2   This contains the functions to handle the platform driver.
   3
   4   Copyright (C) 2007-2011  STMicroelectronics Ltd
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  23 *******************************************************************************/
  24
  25 #include <linux/platform_device.h>
  26 #include <linux/module.h>
  27 #include <linux/io.h>
  28 #include <linux/of.h>
  29 #include <linux/of_net.h>
  30 #include <linux/of_device.h>
  31 #include <linux/of_mdio.h>
  32
  33 #include "stmmac.h"
  34 #include "stmmac_platform.h"
  35
  36 #ifdef CONFIG_OF
  37
  38 /**
  39  * dwmac1000_validate_mcast_bins - validates the number of Multicast filter bins
  40  * @mcast_bins: Multicast filtering bins
  41  * Description:
  42  * this function validates the number of Multicast filtering bins specified
  43  * by the configuration through the device tree. The Synopsys GMAC supports
  44  * 64 bins, 128 bins, or 256 bins. "bins" refer to the division of CRC
  45  * number space. 64 bins correspond to 6 bits of the CRC, 128 corresponds
  46  * to 7 bits, and 256 refers to 8 bits of the CRC. Any other setting is
  47  * invalid and will cause the filtering algorithm to use Multicast
  48  * promiscuous mode.
  49  */
  50 static int dwmac1000_validate_mcast_bins(int mcast_bins)
  51 {
  52         int x = mcast_bins;
  53
  54         switch (x) {
  55         case HASH_TABLE_SIZE:
  56         case 128:
  57         case 256:
  58                 break;
  59         default:
  60                 x = 0;
  61                 pr_info("Hash table entries set to unexpected value %d",
  62                         mcast_bins);
  63                 break;
  64         }
  65         return x;
  66 }
  67
  68 /**
  69  * dwmac1000_validate_ucast_entries - validate the Unicast address entries
  70  * @ucast_entries: number of Unicast address entries
  71  * Description:
  72  * This function validates the number of Unicast address entries supported
  73  * by a particular Synopsys 10/100/1000 controller. The Synopsys controller
  74  * supports 1, 32, 64, or 128 Unicast filter entries for it's Unicast filter
  75  * logic. This function validates a valid, supported configuration is
  76  * selected, and defaults to 1 Unicast address if an unsupported
  77  * configuration is selected.
  78  */
  79 static int dwmac1000_validate_ucast_entries(int ucast_entries)
  80 {
  81         int x = ucast_entries;
  82
  83         switch (x) {
  84         case 1:
  85         case 32:
  86         case 64:
  87         case 128:
  88                 break;
  89         default:
  90                 x = 1;
  91                 pr_info("Unicast table entries set to unexpected value %d\n",
  92                         ucast_entries);
  93                 break;
  94         }
  95         return x;
  96 }
  97
  98 /**
  99  * stmmac_axi_setup - parse DT parameters for programming the AXI register
 100  * @pdev: platform device
 101  * @priv: driver private struct.
 102  * Description:
 103  * if required, from device-tree the AXI internal register can be tuned
 104  * by using platform parameters.
 105  */
 106 static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev)
 107 {
 108         struct device_node *np;
 109         struct stmmac_axi *axi;
 110
 111         np = of_parse_phandle(pdev->dev.of_node, "snps,axi-config", 0);
 112         if (!np)
 113                 return NULL;
 114
 115         axi = kzalloc(sizeof(*axi), GFP_KERNEL);
 116         if (!axi)
 117                 return ERR_PTR(-ENOMEM);
 118
 119         axi->axi_lpi_en = of_property_read_bool(np, "snps,lpi_en");
 120         axi->axi_xit_frm = of_property_read_bool(np, "snps,xit_frm");
 121         axi->axi_kbbe = of_property_read_bool(np, "snps,axi_kbbe");
 122         axi->axi_axi_all = of_property_read_bool(np, "snps,axi_all");
 123         axi->axi_fb = of_property_read_bool(np, "snps,axi_fb");
 124         axi->axi_mb = of_property_read_bool(np, "snps,axi_mb");
 125         axi->axi_rb =  of_property_read_bool(np, "snps,axi_rb");
 126
 127         of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt);
 128         of_property_read_u32(np, "snps,rd_osr_lmt", &axi->axi_rd_osr_lmt);
 129         of_property_read_u32_array(np, "snps,blen", axi->axi_blen, AXI_BLEN);
 130
 131         return axi;
 132 }
 133
 134 /**
 135  * stmmac_dt_phy - parse device-tree driver parameters to allocate PHY resources
 136  * @plat: driver data platform structure
 137  * @np: device tree node
 138  * @dev: device pointer
 139  * Description:
 140  * The mdio bus will be allocated in case of a phy transceiver is on board;
 141  * it will be NULL if the fixed-link is configured.
 142  * If there is the "snps,dwmac-mdio" sub-node the mdio will be allocated
 143  * in any case (for DSA, mdio must be registered even if fixed-link).
 144  * The table below sums the supported configurations:
 145  *      -------------------------------
 146  *      snps,phy-addr   |     Y
 147  *      -------------------------------
 148  *      phy-handle      |     Y
 149  *      -------------------------------
 150  *      fixed-link      |     N
 151  *      -------------------------------
 152  *      snps,dwmac-mdio |
 153  *        even if       |     Y
 154  *      fixed-link      |
 155  *      -------------------------------
 156  *
 157  * It returns 0 in case of success otherwise -ENODEV.
 158  */
 159 static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
 160                          struct device_node *np, struct device *dev)
 161 {
 162         bool mdio = true;
 163
 164         /* If phy-handle property is passed from DT, use it as the PHY */
 165         plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
 166         if (plat->phy_node)
 167                 dev_dbg(dev, "Found phy-handle subnode\n");
 168
 169         /* If phy-handle is not specified, check if we have a fixed-phy */
 170         if (!plat->phy_node && of_phy_is_fixed_link(np)) {
 171                 if ((of_phy_register_fixed_link(np) < 0))
 172                         return -ENODEV;
 173
 174                 dev_dbg(dev, "Found fixed-link subnode\n");
 175                 plat->phy_node = of_node_get(np);
 176                 mdio = false;
 177         }
 178
 179         /* If snps,dwmac-mdio is passed from DT, always register the MDIO */
 180         for_each_child_of_node(np, plat->mdio_node) {
 181                 if (of_device_is_compatible(plat->mdio_node, "snps,dwmac-mdio"))
 182                         break;
 183         }
 184
 185         if (plat->mdio_node) {
 186                 dev_dbg(dev, "Found MDIO subnode\n");
 187                 mdio = true;
 188         }
 189
 190         if (mdio)
 191                 plat->mdio_bus_data =
 192                         devm_kzalloc(dev, sizeof(struct stmmac_mdio_bus_data),
 193                                      GFP_KERNEL);
 194         return 0;
 195 }
 196
 197 /**
 198  * stmmac_probe_config_dt - parse device-tree driver parameters
 199  * @pdev: platform_device structure
 200  * @plat: driver data platform structure
 201  * @mac: MAC address to use
 202  * Description:
 203  * this function is to read the driver parameters from device-tree and
 204  * set some private fields that will be used by the main at runtime.
 205  */
 206 struct plat_stmmacenet_data *
 207 stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 208 {
 209         struct device_node *np = pdev->dev.of_node;
 210         struct plat_stmmacenet_data *plat;
 211         struct stmmac_dma_cfg *dma_cfg;
 212
 213         plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
 214         if (!plat)
 215                 return ERR_PTR(-ENOMEM);
 216
 217         *mac = of_get_mac_address(np);
 218         plat->interface = of_get_phy_mode(np);
 219
 220         /* Get max speed of operation from device tree */
 221         if (of_property_read_u32(np, "max-speed", &plat->max_speed))
 222                 plat->max_speed = -1;
 223
 224         plat->bus_id = of_alias_get_id(np, "ethernet");
 225         if (plat->bus_id < 0)
 226                 plat->bus_id = 0;
 227
 228         /* Default to phy auto-detection */
 229         plat->phy_addr = -1;
 230
 231         /* "snps,phy-addr" is not a standard property. Mark it as deprecated
 232          * and warn of its use. Remove this when phy node support is added.
 233          */
 234         if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
 235                 dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
 236
 237         /* To Configure PHY by using all device-tree supported properties */
 238         if (stmmac_dt_phy(plat, np, &pdev->dev))
 239                 return ERR_PTR(-ENODEV);
 240
 241         of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);
 242
 243         of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);
 244
 245         plat->force_sf_dma_mode =
 246                 of_property_read_bool(np, "snps,force_sf_dma_mode");
 247
 248         /* Set the maxmtu to a default of JUMBO_LEN in case the
 249          * parameter is not present in the device tree.
 250          */
 251         plat->maxmtu = JUMBO_LEN;
 252
 253         /* Set default value for multicast hash bins */
 254         plat->multicast_filter_bins = HASH_TABLE_SIZE;
 255
 256         /* Set default value for unicast filter entries */
 257         plat->unicast_filter_entries = 1;
 258
 259         /*
 260          * Currently only the properties needed on SPEAr600
 261          * are provided. All other properties should be added
 262          * once needed on other platforms.
 263          */
 264         if (of_device_is_compatible(np, "st,spear600-gmac") ||
 265                 of_device_is_compatible(np, "snps,dwmac-3.70a") ||
 266                 of_device_is_compatible(np, "snps,dwmac")) {
 267                 /* Note that the max-frame-size parameter as defined in the
 268                  * ePAPR v1.1 spec is defined as max-frame-size, it's
 269                  * actually used as the IEEE definition of MAC Client
 270                  * data, or MTU. The ePAPR specification is confusing as
 271                  * the definition is max-frame-size, but usage examples
 272                  * are clearly MTUs
 273                  */
 274                 of_property_read_u32(np, "max-frame-size", &plat->maxmtu);
 275                 of_property_read_u32(np, "snps,multicast-filter-bins",
 276                                      &plat->multicast_filter_bins);
 277                 of_property_read_u32(np, "snps,perfect-filter-entries",
 278                                      &plat->unicast_filter_entries);
 279                 plat->unicast_filter_entries = dwmac1000_validate_ucast_entries(
 280                                                plat->unicast_filter_entries);
 281                 plat->multicast_filter_bins = dwmac1000_validate_mcast_bins(
 282                                               plat->multicast_filter_bins);
 283                 plat->has_gmac = 1;
 284                 plat->pmt = 1;
 285         }
 286
 287         if (of_device_is_compatible(np, "snps,dwmac-3.610") ||
 288                 of_device_is_compatible(np, "snps,dwmac-3.710")) {
 289                 plat->enh_desc = 1;
 290                 plat->bugged_jumbo = 1;
 291                 plat->force_sf_dma_mode = 1;
 292         }
 293
 294         if (of_find_property(np, "snps,pbl", NULL)) {
 295                 dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
 296                                        GFP_KERNEL);
 297                 if (!dma_cfg) {
 298                         of_node_put(np);
 299                         return ERR_PTR(-ENOMEM);
 300                 }
 301                 plat->dma_cfg = dma_cfg;
 302                 of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
 303                 dma_cfg->aal = of_property_read_bool(np, "snps,aal");
 304                 dma_cfg->fixed_burst =
 305                         of_property_read_bool(np, "snps,fixed-burst");
 306                 dma_cfg->mixed_burst =
 307                         of_property_read_bool(np, "snps,mixed-burst");
 308         }
 309         plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
 310         if (plat->force_thresh_dma_mode) {
 311                 plat->force_sf_dma_mode = 0;
 312                 pr_warn("force_sf_dma_mode is ignored if force_thresh_dma_mode is set.");
 313         }
 314
 315         plat->axi = stmmac_axi_setup(pdev);
 316
 317         return plat;
 318 }
 319 #else
 320 struct plat_stmmacenet_data *
 321 stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 322 {
 323         return ERR_PTR(-ENOSYS);
 324 }
 325 #endif /* CONFIG_OF */
 326 EXPORT_SYMBOL_GPL(stmmac_probe_config_dt);
 327
 328 int stmmac_get_platform_resources(struct platform_device *pdev,
 329                                   struct stmmac_resources *stmmac_res)
 330 {
 331         struct resource *res;
 332
 333         memset(stmmac_res, 0, sizeof(*stmmac_res));
 334
 335         /* Get IRQ information early to have an ability to ask for deferred
 336          * probe if needed before we went too far with resource allocation.
 337          */
 338         stmmac_res->irq = platform_get_irq_byname(pdev, "macirq");
 339         if (stmmac_res->irq < 0) {
 340                 if (stmmac_res->irq != -EPROBE_DEFER) {
 341                         dev_err(&pdev->dev,
 342                                 "MAC IRQ configuration information not found\n");
 343                 }
 344                 return stmmac_res->irq;
 345         }
 346
 347         /* On some platforms e.g. SPEAr the wake up irq differs from the mac irq
 348          * The external wake up irq can be passed through the platform code
 349          * named as "eth_wake_irq"
 350          *
 351          * In case the wake up interrupt is not passed from the platform
 352          * so the driver will continue to use the mac irq (ndev->irq)
 353          */
 354         stmmac_res->wol_irq = platform_get_irq_byname(pdev, "eth_wake_irq");
 355         if (stmmac_res->wol_irq < 0) {
 356                 if (stmmac_res->wol_irq == -EPROBE_DEFER)
 357                         return -EPROBE_DEFER;
 358                 stmmac_res->wol_irq = stmmac_res->irq;
 359         }
 360
 361         stmmac_res->lpi_irq = platform_get_irq_byname(pdev, "eth_lpi");
 362         if (stmmac_res->lpi_irq == -EPROBE_DEFER)
 363                 return -EPROBE_DEFER;
 364
 365         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 366         stmmac_res->addr = devm_ioremap_resource(&pdev->dev, res);
 367
 368         return PTR_ERR_OR_ZERO(stmmac_res->addr);
 369 }
 370 EXPORT_SYMBOL_GPL(stmmac_get_platform_resources);
 371
 372 /**
 373  * stmmac_pltfr_remove
 374  * @pdev: platform device pointer
 375  * Description: this function calls the main to free the net resources
 376  * and calls the platforms hook and release the resources (e.g. mem).
 377  */
 378 int stmmac_pltfr_remove(struct platform_device *pdev)
 379 {
 380         struct net_device *ndev = platform_get_drvdata(pdev);
 381         struct stmmac_priv *priv = netdev_priv(ndev);
 382         int ret = stmmac_dvr_remove(ndev);
 383
 384         if (priv->plat->exit)
 385                 priv->plat->exit(pdev, priv->plat->bsp_priv);
 386
 387         return ret;
 388 }
 389 EXPORT_SYMBOL_GPL(stmmac_pltfr_remove);
 390
 391 #ifdef CONFIG_PM_SLEEP
 392 /**
 393  * stmmac_pltfr_suspend
 394  * @dev: device pointer
 395  * Description: this function is invoked when suspend the driver and it direcly
 396  * call the main suspend function and then, if required, on some platform, it
 397  * can call an exit helper.
 398  */
 399 static int stmmac_pltfr_suspend(struct device *dev)
 400 {
 401         int ret;
 402         struct net_device *ndev = dev_get_drvdata(dev);
 403         struct stmmac_priv *priv = netdev_priv(ndev);
 404         struct platform_device *pdev = to_platform_device(dev);
 405
 406         ret = stmmac_suspend(ndev);
 407         if (priv->plat->exit)
 408                 priv->plat->exit(pdev, priv->plat->bsp_priv);
 409
 410         return ret;
 411 }
 412
 413 /**
 414  * stmmac_pltfr_resume
 415  * @dev: device pointer
 416  * Description: this function is invoked when resume the driver before calling
 417  * the main resume function, on some platforms, it can call own init helper
 418  * if required.
 419  */
 420 static int stmmac_pltfr_resume(struct device *dev)
 421 {
 422         struct net_device *ndev = dev_get_drvdata(dev);
 423         struct stmmac_priv *priv = netdev_priv(ndev);
 424         struct platform_device *pdev = to_platform_device(dev);
 425
 426         if (priv->plat->init)
 427                 priv->plat->init(pdev, priv->plat->bsp_priv);
 428
 429         return stmmac_resume(ndev);
 430 }
 431 #endif /* CONFIG_PM_SLEEP */
 432
 433 SIMPLE_DEV_PM_OPS(stmmac_pltfr_pm_ops, stmmac_pltfr_suspend,
 434                                        stmmac_pltfr_resume);
 435 EXPORT_SYMBOL_GPL(stmmac_pltfr_pm_ops);
 436
 437 MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet platform support");
 438 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
 439 MODULE_LICENSE("GPL");