1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * dwc3-xilinx.c - Xilinx DWC3 controller specific glue driver 4 * 5 * Authors: Manish Narani <manish.narani@xilinx.com> 6 * Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/kernel.h> 11 #include <linux/slab.h> 12 #include <linux/clk.h> 13 #include <linux/of.h> 14 #include <linux/platform_device.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/of_gpio.h> 17 #include <linux/of_platform.h> 18 #include <linux/pm_runtime.h> 19 #include <linux/reset.h> 20 #include <linux/of_address.h> 21 #include <linux/delay.h> 22 #include <linux/firmware/xlnx-zynqmp.h> 23 #include <linux/io.h> 24 25 #include <linux/phy/phy.h> 26 27 /* USB phy reset mask register */ 28 #define XLNX_USB_PHY_RST_EN 0x001C 29 #define XLNX_PHY_RST_MASK 0x1 30 31 /* Xilinx USB 3.0 IP Register */ 32 #define XLNX_USB_TRAFFIC_ROUTE_CONFIG 0x005C 33 #define XLNX_USB_TRAFFIC_ROUTE_FPD 0x1 34 35 /* Versal USB Reset ID */ 36 #define VERSAL_USB_RESET_ID 0xC104036 37 38 #define XLNX_USB_FPD_PIPE_CLK 0x7c 39 #define PIPE_CLK_DESELECT 1 40 #define PIPE_CLK_SELECT 0 41 #define XLNX_USB_FPD_POWER_PRSNT 0x80 42 #define FPD_POWER_PRSNT_OPTION BIT(0) 43 44 struct dwc3_xlnx { 45 int num_clocks; 46 struct clk_bulk_data *clks; 47 struct device *dev; 48 void __iomem *regs; 49 int (*pltfm_init)(struct dwc3_xlnx *data); 50 struct phy *usb3_phy; 51 }; 52 53 static void dwc3_xlnx_mask_phy_rst(struct dwc3_xlnx *priv_data, bool mask) 54 { 55 u32 reg; 56 57 /* 58 * Enable or disable ULPI PHY reset from USB Controller. 59 * This does not actually reset the phy, but just controls 60 * whether USB controller can or cannot reset ULPI PHY. 61 */ 62 reg = readl(priv_data->regs + XLNX_USB_PHY_RST_EN); 63 64 if (mask) 65 reg &= ~XLNX_PHY_RST_MASK; 66 else 67 reg |= XLNX_PHY_RST_MASK; 68 69 writel(reg, priv_data->regs + XLNX_USB_PHY_RST_EN); 70 } 71 72 static int dwc3_xlnx_init_versal(struct dwc3_xlnx *priv_data) 73 { 74 struct device *dev = priv_data->dev; 75 int ret; 76 77 dwc3_xlnx_mask_phy_rst(priv_data, false); 78 79 /* Assert and De-assert reset */ 80 ret = zynqmp_pm_reset_assert(VERSAL_USB_RESET_ID, 81 PM_RESET_ACTION_ASSERT); 82 if (ret < 0) { 83 dev_err_probe(dev, ret, "failed to assert Reset\n"); 84 return ret; 85 } 86 87 ret = zynqmp_pm_reset_assert(VERSAL_USB_RESET_ID, 88 PM_RESET_ACTION_RELEASE); 89 if (ret < 0) { 90 dev_err_probe(dev, ret, "failed to De-assert Reset\n"); 91 return ret; 92 } 93 94 dwc3_xlnx_mask_phy_rst(priv_data, true); 95 96 return 0; 97 } 98 99 static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data) 100 { 101 struct device *dev = priv_data->dev; 102 struct reset_control *crst, *hibrst, *apbrst; 103 struct gpio_desc *reset_gpio; 104 int ret = 0; 105 u32 reg; 106 107 priv_data->usb3_phy = devm_phy_optional_get(dev, "usb3-phy"); 108 if (IS_ERR(priv_data->usb3_phy)) { 109 ret = PTR_ERR(priv_data->usb3_phy); 110 dev_err_probe(dev, ret, 111 "failed to get USB3 PHY\n"); 112 goto err; 113 } 114 115 /* 116 * The following core resets are not required unless a USB3 PHY 117 * is used, and the subsequent register settings are not required 118 * unless a core reset is performed (they should be set properly 119 * by the first-stage boot loader, but may be reverted by a core 120 * reset). They may also break the configuration if USB3 is actually 121 * in use but the usb3-phy entry is missing from the device tree. 122 * Therefore, skip these operations in this case. 123 */ 124 if (!priv_data->usb3_phy) 125 goto skip_usb3_phy; 126 127 crst = devm_reset_control_get_exclusive(dev, "usb_crst"); 128 if (IS_ERR(crst)) { 129 ret = PTR_ERR(crst); 130 dev_err_probe(dev, ret, 131 "failed to get core reset signal\n"); 132 goto err; 133 } 134 135 hibrst = devm_reset_control_get_exclusive(dev, "usb_hibrst"); 136 if (IS_ERR(hibrst)) { 137 ret = PTR_ERR(hibrst); 138 dev_err_probe(dev, ret, 139 "failed to get hibernation reset signal\n"); 140 goto err; 141 } 142 143 apbrst = devm_reset_control_get_exclusive(dev, "usb_apbrst"); 144 if (IS_ERR(apbrst)) { 145 ret = PTR_ERR(apbrst); 146 dev_err_probe(dev, ret, 147 "failed to get APB reset signal\n"); 148 goto err; 149 } 150 151 ret = reset_control_assert(crst); 152 if (ret < 0) { 153 dev_err(dev, "Failed to assert core reset\n"); 154 goto err; 155 } 156 157 ret = reset_control_assert(hibrst); 158 if (ret < 0) { 159 dev_err(dev, "Failed to assert hibernation reset\n"); 160 goto err; 161 } 162 163 ret = reset_control_assert(apbrst); 164 if (ret < 0) { 165 dev_err(dev, "Failed to assert APB reset\n"); 166 goto err; 167 } 168 169 ret = phy_init(priv_data->usb3_phy); 170 if (ret < 0) { 171 phy_exit(priv_data->usb3_phy); 172 goto err; 173 } 174 175 ret = reset_control_deassert(apbrst); 176 if (ret < 0) { 177 dev_err(dev, "Failed to release APB reset\n"); 178 goto err; 179 } 180 181 /* Set PIPE Power Present signal in FPD Power Present Register*/ 182 writel(FPD_POWER_PRSNT_OPTION, priv_data->regs + XLNX_USB_FPD_POWER_PRSNT); 183 184 /* Set the PIPE Clock Select bit in FPD PIPE Clock register */ 185 writel(PIPE_CLK_SELECT, priv_data->regs + XLNX_USB_FPD_PIPE_CLK); 186 187 ret = reset_control_deassert(crst); 188 if (ret < 0) { 189 dev_err(dev, "Failed to release core reset\n"); 190 goto err; 191 } 192 193 ret = reset_control_deassert(hibrst); 194 if (ret < 0) { 195 dev_err(dev, "Failed to release hibernation reset\n"); 196 goto err; 197 } 198 199 ret = phy_power_on(priv_data->usb3_phy); 200 if (ret < 0) { 201 phy_exit(priv_data->usb3_phy); 202 goto err; 203 } 204 205 skip_usb3_phy: 206 /* ulpi reset via gpio-modepin or gpio-framework driver */ 207 reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 208 if (IS_ERR(reset_gpio)) { 209 return dev_err_probe(dev, PTR_ERR(reset_gpio), 210 "Failed to request reset GPIO\n"); 211 } 212 213 if (reset_gpio) { 214 /* Toggle ulpi to reset the phy. */ 215 gpiod_set_value_cansleep(reset_gpio, 1); 216 usleep_range(5000, 10000); 217 gpiod_set_value_cansleep(reset_gpio, 0); 218 usleep_range(5000, 10000); 219 } 220 221 /* 222 * This routes the USB DMA traffic to go through FPD path instead 223 * of reaching DDR directly. This traffic routing is needed to 224 * make SMMU and CCI work with USB DMA. 225 */ 226 if (of_dma_is_coherent(dev->of_node) || device_iommu_mapped(dev)) { 227 reg = readl(priv_data->regs + XLNX_USB_TRAFFIC_ROUTE_CONFIG); 228 reg |= XLNX_USB_TRAFFIC_ROUTE_FPD; 229 writel(reg, priv_data->regs + XLNX_USB_TRAFFIC_ROUTE_CONFIG); 230 } 231 232 err: 233 return ret; 234 } 235 236 static const struct of_device_id dwc3_xlnx_of_match[] = { 237 { 238 .compatible = "xlnx,zynqmp-dwc3", 239 .data = &dwc3_xlnx_init_zynqmp, 240 }, 241 { 242 .compatible = "xlnx,versal-dwc3", 243 .data = &dwc3_xlnx_init_versal, 244 }, 245 { /* Sentinel */ } 246 }; 247 MODULE_DEVICE_TABLE(of, dwc3_xlnx_of_match); 248 249 static int dwc3_xlnx_probe(struct platform_device *pdev) 250 { 251 struct dwc3_xlnx *priv_data; 252 struct device *dev = &pdev->dev; 253 struct device_node *np = dev->of_node; 254 const struct of_device_id *match; 255 void __iomem *regs; 256 int ret; 257 258 priv_data = devm_kzalloc(dev, sizeof(*priv_data), GFP_KERNEL); 259 if (!priv_data) 260 return -ENOMEM; 261 262 regs = devm_platform_ioremap_resource(pdev, 0); 263 if (IS_ERR(regs)) { 264 ret = PTR_ERR(regs); 265 dev_err_probe(dev, ret, "failed to map registers\n"); 266 return ret; 267 } 268 269 match = of_match_node(dwc3_xlnx_of_match, pdev->dev.of_node); 270 271 priv_data->pltfm_init = match->data; 272 priv_data->regs = regs; 273 priv_data->dev = dev; 274 275 platform_set_drvdata(pdev, priv_data); 276 277 ret = devm_clk_bulk_get_all(priv_data->dev, &priv_data->clks); 278 if (ret < 0) 279 return ret; 280 281 priv_data->num_clocks = ret; 282 283 ret = clk_bulk_prepare_enable(priv_data->num_clocks, priv_data->clks); 284 if (ret) 285 return ret; 286 287 ret = priv_data->pltfm_init(priv_data); 288 if (ret) 289 goto err_clk_put; 290 291 ret = of_platform_populate(np, NULL, NULL, dev); 292 if (ret) 293 goto err_clk_put; 294 295 pm_runtime_set_active(dev); 296 pm_runtime_enable(dev); 297 pm_suspend_ignore_children(dev, false); 298 pm_runtime_get_sync(dev); 299 300 return 0; 301 302 err_clk_put: 303 clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks); 304 305 return ret; 306 } 307 308 static int dwc3_xlnx_remove(struct platform_device *pdev) 309 { 310 struct dwc3_xlnx *priv_data = platform_get_drvdata(pdev); 311 struct device *dev = &pdev->dev; 312 313 of_platform_depopulate(dev); 314 315 clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks); 316 priv_data->num_clocks = 0; 317 318 pm_runtime_disable(dev); 319 pm_runtime_put_noidle(dev); 320 pm_runtime_set_suspended(dev); 321 322 return 0; 323 } 324 325 static int __maybe_unused dwc3_xlnx_runtime_suspend(struct device *dev) 326 { 327 struct dwc3_xlnx *priv_data = dev_get_drvdata(dev); 328 329 clk_bulk_disable(priv_data->num_clocks, priv_data->clks); 330 331 return 0; 332 } 333 334 static int __maybe_unused dwc3_xlnx_runtime_resume(struct device *dev) 335 { 336 struct dwc3_xlnx *priv_data = dev_get_drvdata(dev); 337 338 return clk_bulk_enable(priv_data->num_clocks, priv_data->clks); 339 } 340 341 static int __maybe_unused dwc3_xlnx_runtime_idle(struct device *dev) 342 { 343 pm_runtime_mark_last_busy(dev); 344 pm_runtime_autosuspend(dev); 345 346 return 0; 347 } 348 349 static int __maybe_unused dwc3_xlnx_suspend(struct device *dev) 350 { 351 struct dwc3_xlnx *priv_data = dev_get_drvdata(dev); 352 353 phy_exit(priv_data->usb3_phy); 354 355 /* Disable the clocks */ 356 clk_bulk_disable(priv_data->num_clocks, priv_data->clks); 357 358 return 0; 359 } 360 361 static int __maybe_unused dwc3_xlnx_resume(struct device *dev) 362 { 363 struct dwc3_xlnx *priv_data = dev_get_drvdata(dev); 364 int ret; 365 366 ret = clk_bulk_enable(priv_data->num_clocks, priv_data->clks); 367 if (ret) 368 return ret; 369 370 ret = phy_init(priv_data->usb3_phy); 371 if (ret < 0) 372 return ret; 373 374 ret = phy_power_on(priv_data->usb3_phy); 375 if (ret < 0) { 376 phy_exit(priv_data->usb3_phy); 377 return ret; 378 } 379 380 return 0; 381 } 382 383 static const struct dev_pm_ops dwc3_xlnx_dev_pm_ops = { 384 SET_SYSTEM_SLEEP_PM_OPS(dwc3_xlnx_suspend, dwc3_xlnx_resume) 385 SET_RUNTIME_PM_OPS(dwc3_xlnx_runtime_suspend, 386 dwc3_xlnx_runtime_resume, dwc3_xlnx_runtime_idle) 387 }; 388 389 static struct platform_driver dwc3_xlnx_driver = { 390 .probe = dwc3_xlnx_probe, 391 .remove = dwc3_xlnx_remove, 392 .driver = { 393 .name = "dwc3-xilinx", 394 .of_match_table = dwc3_xlnx_of_match, 395 .pm = &dwc3_xlnx_dev_pm_ops, 396 }, 397 }; 398 399 module_platform_driver(dwc3_xlnx_driver); 400 401 MODULE_LICENSE("GPL v2"); 402 MODULE_DESCRIPTION("Xilinx DWC3 controller specific glue driver"); 403 MODULE_AUTHOR("Manish Narani <manish.narani@xilinx.com>"); 404 MODULE_AUTHOR("Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>"); 405