1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Synopsys DWC Ethernet Quality-of-Service v4.10a linux driver 4 * 5 * Copyright (C) 2016 Joao Pinto <jpinto@synopsys.com> 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/clk-provider.h> 10 #include <linux/device.h> 11 #include <linux/gpio/consumer.h> 12 #include <linux/ethtool.h> 13 #include <linux/io.h> 14 #include <linux/iopoll.h> 15 #include <linux/ioport.h> 16 #include <linux/module.h> 17 #include <linux/of_device.h> 18 #include <linux/of_net.h> 19 #include <linux/mfd/syscon.h> 20 #include <linux/platform_device.h> 21 #include <linux/reset.h> 22 #include <linux/stmmac.h> 23 24 #include "stmmac_platform.h" 25 #include "dwmac4.h" 26 27 struct tegra_eqos { 28 struct device *dev; 29 void __iomem *regs; 30 31 struct reset_control *rst; 32 struct clk *clk_master; 33 struct clk *clk_slave; 34 struct clk *clk_tx; 35 struct clk *clk_rx; 36 37 struct gpio_desc *reset; 38 }; 39 40 static int dwc_eth_dwmac_config_dt(struct platform_device *pdev, 41 struct plat_stmmacenet_data *plat_dat) 42 { 43 struct device *dev = &pdev->dev; 44 u32 burst_map = 0; 45 u32 bit_index = 0; 46 u32 a_index = 0; 47 48 if (!plat_dat->axi) { 49 plat_dat->axi = kzalloc(sizeof(struct stmmac_axi), GFP_KERNEL); 50 51 if (!plat_dat->axi) 52 return -ENOMEM; 53 } 54 55 plat_dat->axi->axi_lpi_en = device_property_read_bool(dev, 56 "snps,en-lpi"); 57 if (device_property_read_u32(dev, "snps,write-requests", 58 &plat_dat->axi->axi_wr_osr_lmt)) { 59 /** 60 * Since the register has a reset value of 1, if property 61 * is missing, default to 1. 62 */ 63 plat_dat->axi->axi_wr_osr_lmt = 1; 64 } else { 65 /** 66 * If property exists, to keep the behavior from dwc_eth_qos, 67 * subtract one after parsing. 68 */ 69 plat_dat->axi->axi_wr_osr_lmt--; 70 } 71 72 if (device_property_read_u32(dev, "snps,read-requests", 73 &plat_dat->axi->axi_rd_osr_lmt)) { 74 /** 75 * Since the register has a reset value of 1, if property 76 * is missing, default to 1. 77 */ 78 plat_dat->axi->axi_rd_osr_lmt = 1; 79 } else { 80 /** 81 * If property exists, to keep the behavior from dwc_eth_qos, 82 * subtract one after parsing. 83 */ 84 plat_dat->axi->axi_rd_osr_lmt--; 85 } 86 device_property_read_u32(dev, "snps,burst-map", &burst_map); 87 88 /* converts burst-map bitmask to burst array */ 89 for (bit_index = 0; bit_index < 7; bit_index++) { 90 if (burst_map & (1 << bit_index)) { 91 switch (bit_index) { 92 case 0: 93 plat_dat->axi->axi_blen[a_index] = 4; break; 94 case 1: 95 plat_dat->axi->axi_blen[a_index] = 8; break; 96 case 2: 97 plat_dat->axi->axi_blen[a_index] = 16; break; 98 case 3: 99 plat_dat->axi->axi_blen[a_index] = 32; break; 100 case 4: 101 plat_dat->axi->axi_blen[a_index] = 64; break; 102 case 5: 103 plat_dat->axi->axi_blen[a_index] = 128; break; 104 case 6: 105 plat_dat->axi->axi_blen[a_index] = 256; break; 106 default: 107 break; 108 } 109 a_index++; 110 } 111 } 112 113 /* dwc-qos needs GMAC4, AAL, TSO and PMT */ 114 plat_dat->has_gmac4 = 1; 115 plat_dat->dma_cfg->aal = 1; 116 plat_dat->tso_en = 1; 117 plat_dat->pmt = 1; 118 119 return 0; 120 } 121 122 static int dwc_qos_probe(struct platform_device *pdev, 123 struct plat_stmmacenet_data *plat_dat, 124 struct stmmac_resources *stmmac_res) 125 { 126 int err; 127 128 plat_dat->stmmac_clk = devm_clk_get(&pdev->dev, "apb_pclk"); 129 if (IS_ERR(plat_dat->stmmac_clk)) { 130 dev_err(&pdev->dev, "apb_pclk clock not found.\n"); 131 return PTR_ERR(plat_dat->stmmac_clk); 132 } 133 134 err = clk_prepare_enable(plat_dat->stmmac_clk); 135 if (err < 0) { 136 dev_err(&pdev->dev, "failed to enable apb_pclk clock: %d\n", 137 err); 138 return err; 139 } 140 141 plat_dat->pclk = devm_clk_get(&pdev->dev, "phy_ref_clk"); 142 if (IS_ERR(plat_dat->pclk)) { 143 dev_err(&pdev->dev, "phy_ref_clk clock not found.\n"); 144 err = PTR_ERR(plat_dat->pclk); 145 goto disable; 146 } 147 148 err = clk_prepare_enable(plat_dat->pclk); 149 if (err < 0) { 150 dev_err(&pdev->dev, "failed to enable phy_ref clock: %d\n", 151 err); 152 goto disable; 153 } 154 155 return 0; 156 157 disable: 158 clk_disable_unprepare(plat_dat->stmmac_clk); 159 return err; 160 } 161 162 static void dwc_qos_remove(struct platform_device *pdev) 163 { 164 struct net_device *ndev = platform_get_drvdata(pdev); 165 struct stmmac_priv *priv = netdev_priv(ndev); 166 167 clk_disable_unprepare(priv->plat->pclk); 168 clk_disable_unprepare(priv->plat->stmmac_clk); 169 } 170 171 #define SDMEMCOMPPADCTRL 0x8800 172 #define SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD BIT(31) 173 174 #define AUTO_CAL_CONFIG 0x8804 175 #define AUTO_CAL_CONFIG_START BIT(31) 176 #define AUTO_CAL_CONFIG_ENABLE BIT(29) 177 178 #define AUTO_CAL_STATUS 0x880c 179 #define AUTO_CAL_STATUS_ACTIVE BIT(31) 180 181 static void tegra_eqos_fix_speed(void *priv, unsigned int speed) 182 { 183 struct tegra_eqos *eqos = priv; 184 unsigned long rate = 125000000; 185 bool needs_calibration = false; 186 u32 value; 187 int err; 188 189 switch (speed) { 190 case SPEED_1000: 191 needs_calibration = true; 192 rate = 125000000; 193 break; 194 195 case SPEED_100: 196 needs_calibration = true; 197 rate = 25000000; 198 break; 199 200 case SPEED_10: 201 rate = 2500000; 202 break; 203 204 default: 205 dev_err(eqos->dev, "invalid speed %u\n", speed); 206 break; 207 } 208 209 if (needs_calibration) { 210 /* calibrate */ 211 value = readl(eqos->regs + SDMEMCOMPPADCTRL); 212 value |= SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD; 213 writel(value, eqos->regs + SDMEMCOMPPADCTRL); 214 215 udelay(1); 216 217 value = readl(eqos->regs + AUTO_CAL_CONFIG); 218 value |= AUTO_CAL_CONFIG_START | AUTO_CAL_CONFIG_ENABLE; 219 writel(value, eqos->regs + AUTO_CAL_CONFIG); 220 221 err = readl_poll_timeout_atomic(eqos->regs + AUTO_CAL_STATUS, 222 value, 223 value & AUTO_CAL_STATUS_ACTIVE, 224 1, 10); 225 if (err < 0) { 226 dev_err(eqos->dev, "calibration did not start\n"); 227 goto failed; 228 } 229 230 err = readl_poll_timeout_atomic(eqos->regs + AUTO_CAL_STATUS, 231 value, 232 (value & AUTO_CAL_STATUS_ACTIVE) == 0, 233 20, 200); 234 if (err < 0) { 235 dev_err(eqos->dev, "calibration didn't finish\n"); 236 goto failed; 237 } 238 239 failed: 240 value = readl(eqos->regs + SDMEMCOMPPADCTRL); 241 value &= ~SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD; 242 writel(value, eqos->regs + SDMEMCOMPPADCTRL); 243 } else { 244 value = readl(eqos->regs + AUTO_CAL_CONFIG); 245 value &= ~AUTO_CAL_CONFIG_ENABLE; 246 writel(value, eqos->regs + AUTO_CAL_CONFIG); 247 } 248 249 err = clk_set_rate(eqos->clk_tx, rate); 250 if (err < 0) 251 dev_err(eqos->dev, "failed to set TX rate: %d\n", err); 252 } 253 254 static int tegra_eqos_init(struct platform_device *pdev, void *priv) 255 { 256 struct tegra_eqos *eqos = priv; 257 unsigned long rate; 258 u32 value; 259 260 rate = clk_get_rate(eqos->clk_slave); 261 262 value = (rate / 1000000) - 1; 263 writel(value, eqos->regs + GMAC_1US_TIC_COUNTER); 264 265 return 0; 266 } 267 268 static int tegra_eqos_probe(struct platform_device *pdev, 269 struct plat_stmmacenet_data *data, 270 struct stmmac_resources *res) 271 { 272 struct device *dev = &pdev->dev; 273 struct tegra_eqos *eqos; 274 int err; 275 276 eqos = devm_kzalloc(&pdev->dev, sizeof(*eqos), GFP_KERNEL); 277 if (!eqos) 278 return -ENOMEM; 279 280 eqos->dev = &pdev->dev; 281 eqos->regs = res->addr; 282 283 if (!is_of_node(dev->fwnode)) 284 goto bypass_clk_reset_gpio; 285 286 eqos->clk_master = devm_clk_get(&pdev->dev, "master_bus"); 287 if (IS_ERR(eqos->clk_master)) { 288 err = PTR_ERR(eqos->clk_master); 289 goto error; 290 } 291 292 err = clk_prepare_enable(eqos->clk_master); 293 if (err < 0) 294 goto error; 295 296 eqos->clk_slave = devm_clk_get(&pdev->dev, "slave_bus"); 297 if (IS_ERR(eqos->clk_slave)) { 298 err = PTR_ERR(eqos->clk_slave); 299 goto disable_master; 300 } 301 302 data->stmmac_clk = eqos->clk_slave; 303 304 err = clk_prepare_enable(eqos->clk_slave); 305 if (err < 0) 306 goto disable_master; 307 308 eqos->clk_rx = devm_clk_get(&pdev->dev, "rx"); 309 if (IS_ERR(eqos->clk_rx)) { 310 err = PTR_ERR(eqos->clk_rx); 311 goto disable_slave; 312 } 313 314 err = clk_prepare_enable(eqos->clk_rx); 315 if (err < 0) 316 goto disable_slave; 317 318 eqos->clk_tx = devm_clk_get(&pdev->dev, "tx"); 319 if (IS_ERR(eqos->clk_tx)) { 320 err = PTR_ERR(eqos->clk_tx); 321 goto disable_rx; 322 } 323 324 err = clk_prepare_enable(eqos->clk_tx); 325 if (err < 0) 326 goto disable_rx; 327 328 eqos->reset = devm_gpiod_get(&pdev->dev, "phy-reset", GPIOD_OUT_HIGH); 329 if (IS_ERR(eqos->reset)) { 330 err = PTR_ERR(eqos->reset); 331 goto disable_tx; 332 } 333 334 usleep_range(2000, 4000); 335 gpiod_set_value(eqos->reset, 0); 336 337 /* MDIO bus was already reset just above */ 338 data->mdio_bus_data->needs_reset = false; 339 340 eqos->rst = devm_reset_control_get(&pdev->dev, "eqos"); 341 if (IS_ERR(eqos->rst)) { 342 err = PTR_ERR(eqos->rst); 343 goto reset_phy; 344 } 345 346 err = reset_control_assert(eqos->rst); 347 if (err < 0) 348 goto reset_phy; 349 350 usleep_range(2000, 4000); 351 352 err = reset_control_deassert(eqos->rst); 353 if (err < 0) 354 goto reset_phy; 355 356 usleep_range(2000, 4000); 357 358 bypass_clk_reset_gpio: 359 data->fix_mac_speed = tegra_eqos_fix_speed; 360 data->init = tegra_eqos_init; 361 data->bsp_priv = eqos; 362 data->sph_disable = 1; 363 364 err = tegra_eqos_init(pdev, eqos); 365 if (err < 0) 366 goto reset; 367 368 return 0; 369 reset: 370 reset_control_assert(eqos->rst); 371 reset_phy: 372 gpiod_set_value(eqos->reset, 1); 373 disable_tx: 374 clk_disable_unprepare(eqos->clk_tx); 375 disable_rx: 376 clk_disable_unprepare(eqos->clk_rx); 377 disable_slave: 378 clk_disable_unprepare(eqos->clk_slave); 379 disable_master: 380 clk_disable_unprepare(eqos->clk_master); 381 error: 382 return err; 383 } 384 385 static void tegra_eqos_remove(struct platform_device *pdev) 386 { 387 struct tegra_eqos *eqos = get_stmmac_bsp_priv(&pdev->dev); 388 389 reset_control_assert(eqos->rst); 390 gpiod_set_value(eqos->reset, 1); 391 clk_disable_unprepare(eqos->clk_tx); 392 clk_disable_unprepare(eqos->clk_rx); 393 clk_disable_unprepare(eqos->clk_slave); 394 clk_disable_unprepare(eqos->clk_master); 395 } 396 397 struct dwc_eth_dwmac_data { 398 int (*probe)(struct platform_device *pdev, 399 struct plat_stmmacenet_data *data, 400 struct stmmac_resources *res); 401 void (*remove)(struct platform_device *pdev); 402 }; 403 404 static const struct dwc_eth_dwmac_data dwc_qos_data = { 405 .probe = dwc_qos_probe, 406 .remove = dwc_qos_remove, 407 }; 408 409 static const struct dwc_eth_dwmac_data tegra_eqos_data = { 410 .probe = tegra_eqos_probe, 411 .remove = tegra_eqos_remove, 412 }; 413 414 static int dwc_eth_dwmac_probe(struct platform_device *pdev) 415 { 416 const struct dwc_eth_dwmac_data *data; 417 struct plat_stmmacenet_data *plat_dat; 418 struct stmmac_resources stmmac_res; 419 int ret; 420 421 data = device_get_match_data(&pdev->dev); 422 423 memset(&stmmac_res, 0, sizeof(struct stmmac_resources)); 424 425 /** 426 * Since stmmac_platform supports name IRQ only, basic platform 427 * resource initialization is done in the glue logic. 428 */ 429 stmmac_res.irq = platform_get_irq(pdev, 0); 430 if (stmmac_res.irq < 0) 431 return stmmac_res.irq; 432 stmmac_res.wol_irq = stmmac_res.irq; 433 434 stmmac_res.addr = devm_platform_ioremap_resource(pdev, 0); 435 if (IS_ERR(stmmac_res.addr)) 436 return PTR_ERR(stmmac_res.addr); 437 438 plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac); 439 if (IS_ERR(plat_dat)) 440 return PTR_ERR(plat_dat); 441 442 ret = data->probe(pdev, plat_dat, &stmmac_res); 443 if (ret < 0) { 444 dev_err_probe(&pdev->dev, ret, "failed to probe subdriver\n"); 445 446 goto remove_config; 447 } 448 449 ret = dwc_eth_dwmac_config_dt(pdev, plat_dat); 450 if (ret) 451 goto remove; 452 453 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 454 if (ret) 455 goto remove; 456 457 return ret; 458 459 remove: 460 data->remove(pdev); 461 remove_config: 462 stmmac_remove_config_dt(pdev, plat_dat); 463 464 return ret; 465 } 466 467 static int dwc_eth_dwmac_remove(struct platform_device *pdev) 468 { 469 struct net_device *ndev = platform_get_drvdata(pdev); 470 struct stmmac_priv *priv = netdev_priv(ndev); 471 const struct dwc_eth_dwmac_data *data; 472 473 data = device_get_match_data(&pdev->dev); 474 475 stmmac_dvr_remove(&pdev->dev); 476 477 data->remove(pdev); 478 479 stmmac_remove_config_dt(pdev, priv->plat); 480 481 return 0; 482 } 483 484 static const struct of_device_id dwc_eth_dwmac_match[] = { 485 { .compatible = "snps,dwc-qos-ethernet-4.10", .data = &dwc_qos_data }, 486 { .compatible = "nvidia,tegra186-eqos", .data = &tegra_eqos_data }, 487 { } 488 }; 489 MODULE_DEVICE_TABLE(of, dwc_eth_dwmac_match); 490 491 static struct platform_driver dwc_eth_dwmac_driver = { 492 .probe = dwc_eth_dwmac_probe, 493 .remove = dwc_eth_dwmac_remove, 494 .driver = { 495 .name = "dwc-eth-dwmac", 496 .pm = &stmmac_pltfr_pm_ops, 497 .of_match_table = dwc_eth_dwmac_match, 498 }, 499 }; 500 module_platform_driver(dwc_eth_dwmac_driver); 501 502 MODULE_AUTHOR("Joao Pinto <jpinto@synopsys.com>"); 503 MODULE_DESCRIPTION("Synopsys DWC Ethernet Quality-of-Service v4.10a driver"); 504 MODULE_LICENSE("GPL v2"); 505