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"); 440