drivers/usb/mtu3/mtu3_plat.c

   1 /*
   2  * Copyright (C) 2016 MediaTek Inc.
   3  *
   4  * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/iopoll.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/of_address.h>
  23 #include <linux/of_irq.h>
  24 #include <linux/pinctrl/consumer.h>
  25 #include <linux/platform_device.h>
  26
  27 #include "mtu3.h"
  28 #include "mtu3_dr.h"
  29
  30 /* u2-port0 should be powered on and enabled; */
  31 int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks)
  32 {
  33         void __iomem *ibase = ssusb->ippc_base;
  34         u32 value, check_val;
  35         int ret;
  36
  37         check_val = ex_clks | SSUSB_SYS125_RST_B_STS | SSUSB_SYSPLL_STABLE |
  38                         SSUSB_REF_RST_B_STS;
  39
  40         ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value,
  41                         (check_val == (value & check_val)), 100, 20000);
  42         if (ret) {
  43                 dev_err(ssusb->dev, "clks of sts1 are not stable!\n");
  44                 return ret;
  45         }
  46
  47         ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS2, value,
  48                         (value & SSUSB_U2_MAC_SYS_RST_B_STS), 100, 10000);
  49         if (ret) {
  50                 dev_err(ssusb->dev, "mac2 clock is not stable\n");
  51                 return ret;
  52         }
  53
  54         return 0;
  55 }
  56
  57 static int ssusb_phy_init(struct ssusb_mtk *ssusb)
  58 {
  59         int i;
  60         int ret;
  61
  62         for (i = 0; i < ssusb->num_phys; i++) {
  63                 ret = phy_init(ssusb->phys[i]);
  64                 if (ret)
  65                         goto exit_phy;
  66         }
  67         return 0;
  68
  69 exit_phy:
  70         for (; i > 0; i--)
  71                 phy_exit(ssusb->phys[i - 1]);
  72
  73         return ret;
  74 }
  75
  76 static int ssusb_phy_exit(struct ssusb_mtk *ssusb)
  77 {
  78         int i;
  79
  80         for (i = 0; i < ssusb->num_phys; i++)
  81                 phy_exit(ssusb->phys[i]);
  82
  83         return 0;
  84 }
  85
  86 static int ssusb_phy_power_on(struct ssusb_mtk *ssusb)
  87 {
  88         int i;
  89         int ret;
  90
  91         for (i = 0; i < ssusb->num_phys; i++) {
  92                 ret = phy_power_on(ssusb->phys[i]);
  93                 if (ret)
  94                         goto power_off_phy;
  95         }
  96         return 0;
  97
  98 power_off_phy:
  99         for (; i > 0; i--)
 100                 phy_power_off(ssusb->phys[i - 1]);
 101
 102         return ret;
 103 }
 104
 105 static void ssusb_phy_power_off(struct ssusb_mtk *ssusb)
 106 {
 107         unsigned int i;
 108
 109         for (i = 0; i < ssusb->num_phys; i++)
 110                 phy_power_off(ssusb->phys[i]);
 111 }
 112
 113 static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
 114 {
 115         int ret = 0;
 116
 117         ret = regulator_enable(ssusb->vusb33);
 118         if (ret) {
 119                 dev_err(ssusb->dev, "failed to enable vusb33\n");
 120                 goto vusb33_err;
 121         }
 122
 123         ret = clk_prepare_enable(ssusb->sys_clk);
 124         if (ret) {
 125                 dev_err(ssusb->dev, "failed to enable sys_clk\n");
 126                 goto sys_clk_err;
 127         }
 128
 129         ret = clk_prepare_enable(ssusb->ref_clk);
 130         if (ret) {
 131                 dev_err(ssusb->dev, "failed to enable ref_clk\n");
 132                 goto ref_clk_err;
 133         }
 134
 135         ret = ssusb_phy_init(ssusb);
 136         if (ret) {
 137                 dev_err(ssusb->dev, "failed to init phy\n");
 138                 goto phy_init_err;
 139         }
 140
 141         ret = ssusb_phy_power_on(ssusb);
 142         if (ret) {
 143                 dev_err(ssusb->dev, "failed to power on phy\n");
 144                 goto phy_err;
 145         }
 146
 147         return 0;
 148
 149 phy_err:
 150         ssusb_phy_exit(ssusb);
 151 phy_init_err:
 152         clk_disable_unprepare(ssusb->ref_clk);
 153 ref_clk_err:
 154         clk_disable_unprepare(ssusb->sys_clk);
 155 sys_clk_err:
 156         regulator_disable(ssusb->vusb33);
 157 vusb33_err:
 158
 159         return ret;
 160 }
 161
 162 static void ssusb_rscs_exit(struct ssusb_mtk *ssusb)
 163 {
 164         clk_disable_unprepare(ssusb->sys_clk);
 165         clk_disable_unprepare(ssusb->ref_clk);
 166         regulator_disable(ssusb->vusb33);
 167         ssusb_phy_power_off(ssusb);
 168         ssusb_phy_exit(ssusb);
 169 }
 170
 171 static void ssusb_ip_sw_reset(struct ssusb_mtk *ssusb)
 172 {
 173         /* reset whole ip (xhci & u3d) */
 174         mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
 175         udelay(1);
 176         mtu3_clrbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
 177 }
 178
 179 static int get_iddig_pinctrl(struct ssusb_mtk *ssusb)
 180 {
 181         struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
 182
 183         otg_sx->id_pinctrl = devm_pinctrl_get(ssusb->dev);
 184         if (IS_ERR(otg_sx->id_pinctrl)) {
 185                 dev_err(ssusb->dev, "Cannot find id pinctrl!\n");
 186                 return PTR_ERR(otg_sx->id_pinctrl);
 187         }
 188
 189         otg_sx->id_float =
 190                 pinctrl_lookup_state(otg_sx->id_pinctrl, "id_float");
 191         if (IS_ERR(otg_sx->id_float)) {
 192                 dev_err(ssusb->dev, "Cannot find pinctrl id_float!\n");
 193                 return PTR_ERR(otg_sx->id_float);
 194         }
 195
 196         otg_sx->id_ground =
 197                 pinctrl_lookup_state(otg_sx->id_pinctrl, "id_ground");
 198         if (IS_ERR(otg_sx->id_ground)) {
 199                 dev_err(ssusb->dev, "Cannot find pinctrl id_ground!\n");
 200                 return PTR_ERR(otg_sx->id_ground);
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
 207 {
 208         struct device_node *node = pdev->dev.of_node;
 209         struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
 210         struct device *dev = &pdev->dev;
 211         struct regulator *vbus;
 212         struct resource *res;
 213         int i;
 214         int ret;
 215
 216         ssusb->vusb33 = devm_regulator_get(&pdev->dev, "vusb33");
 217         if (IS_ERR(ssusb->vusb33)) {
 218                 dev_err(dev, "failed to get vusb33\n");
 219                 return PTR_ERR(ssusb->vusb33);
 220         }
 221
 222         ssusb->sys_clk = devm_clk_get(dev, "sys_ck");
 223         if (IS_ERR(ssusb->sys_clk)) {
 224                 dev_err(dev, "failed to get sys clock\n");
 225                 return PTR_ERR(ssusb->sys_clk);
 226         }
 227
 228         /*
 229          * reference clock is usually a "fixed-clock", make it optional
 230          * for backward compatibility and ignore the error if it does
 231          * not exist.
 232          */
 233         ssusb->ref_clk = devm_clk_get(dev, "ref_ck");
 234         if (IS_ERR(ssusb->ref_clk)) {
 235                 if (PTR_ERR(ssusb->ref_clk) == -EPROBE_DEFER)
 236                         return -EPROBE_DEFER;
 237
 238                 ssusb->ref_clk = NULL;
 239         }
 240
 241         ssusb->num_phys = of_count_phandle_with_args(node,
 242                         "phys", "#phy-cells");
 243         if (ssusb->num_phys > 0) {
 244                 ssusb->phys = devm_kcalloc(dev, ssusb->num_phys,
 245                                         sizeof(*ssusb->phys), GFP_KERNEL);
 246                 if (!ssusb->phys)
 247                         return -ENOMEM;
 248         } else {
 249                 ssusb->num_phys = 0;
 250         }
 251
 252         for (i = 0; i < ssusb->num_phys; i++) {
 253                 ssusb->phys[i] = devm_of_phy_get_by_index(dev, node, i);
 254                 if (IS_ERR(ssusb->phys[i])) {
 255                         dev_err(dev, "failed to get phy-%d\n", i);
 256                         return PTR_ERR(ssusb->phys[i]);
 257                 }
 258         }
 259
 260         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ippc");
 261         ssusb->ippc_base = devm_ioremap_resource(dev, res);
 262         if (IS_ERR(ssusb->ippc_base))
 263                 return PTR_ERR(ssusb->ippc_base);
 264
 265         ssusb->dr_mode = usb_get_dr_mode(dev);
 266         if (ssusb->dr_mode == USB_DR_MODE_UNKNOWN) {
 267                 dev_err(dev, "dr_mode is error\n");
 268                 return -EINVAL;
 269         }
 270
 271         if (ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
 272                 return 0;
 273
 274         /* if host role is supported */
 275         ret = ssusb_wakeup_of_property_parse(ssusb, node);
 276         if (ret)
 277                 return ret;
 278
 279         if (ssusb->dr_mode != USB_DR_MODE_OTG)
 280                 return 0;
 281
 282         /* if dual-role mode is supported */
 283         vbus = devm_regulator_get(&pdev->dev, "vbus");
 284         if (IS_ERR(vbus)) {
 285                 dev_err(dev, "failed to get vbus\n");
 286                 return PTR_ERR(vbus);
 287         }
 288         otg_sx->vbus = vbus;
 289
 290         otg_sx->is_u3_drd = of_property_read_bool(node, "mediatek,usb3-drd");
 291         otg_sx->manual_drd_enabled =
 292                 of_property_read_bool(node, "enable-manual-drd");
 293
 294         if (of_property_read_bool(node, "extcon")) {
 295                 otg_sx->edev = extcon_get_edev_by_phandle(ssusb->dev, 0);
 296                 if (IS_ERR(otg_sx->edev)) {
 297                         dev_err(ssusb->dev, "couldn't get extcon device\n");
 298                         return -EPROBE_DEFER;
 299                 }
 300                 if (otg_sx->manual_drd_enabled) {
 301                         ret = get_iddig_pinctrl(ssusb);
 302                         if (ret)
 303                                 return ret;
 304                 }
 305         }
 306
 307         dev_info(dev, "dr_mode: %d, is_u3_dr: %d\n",
 308                 ssusb->dr_mode, otg_sx->is_u3_drd);
 309
 310         return 0;
 311 }
 312
 313 static int mtu3_probe(struct platform_device *pdev)
 314 {
 315         struct device_node *node = pdev->dev.of_node;
 316         struct device *dev = &pdev->dev;
 317         struct ssusb_mtk *ssusb;
 318         int ret = -ENOMEM;
 319
 320         /* all elements are set to ZERO as default value */
 321         ssusb = devm_kzalloc(dev, sizeof(*ssusb), GFP_KERNEL);
 322         if (!ssusb)
 323                 return -ENOMEM;
 324
 325         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 326         if (ret) {
 327                 dev_err(dev, "No suitable DMA config available\n");
 328                 return -ENOTSUPP;
 329         }
 330
 331         platform_set_drvdata(pdev, ssusb);
 332         ssusb->dev = dev;
 333
 334         ret = get_ssusb_rscs(pdev, ssusb);
 335         if (ret)
 336                 return ret;
 337
 338         /* enable power domain */
 339         pm_runtime_enable(dev);
 340         pm_runtime_get_sync(dev);
 341         device_enable_async_suspend(dev);
 342
 343         ret = ssusb_rscs_init(ssusb);
 344         if (ret)
 345                 goto comm_init_err;
 346
 347         ssusb_ip_sw_reset(ssusb);
 348
 349         if (IS_ENABLED(CONFIG_USB_MTU3_HOST))
 350                 ssusb->dr_mode = USB_DR_MODE_HOST;
 351         else if (IS_ENABLED(CONFIG_USB_MTU3_GADGET))
 352                 ssusb->dr_mode = USB_DR_MODE_PERIPHERAL;
 353
 354         /* default as host */
 355         ssusb->is_host = !(ssusb->dr_mode == USB_DR_MODE_PERIPHERAL);
 356
 357         switch (ssusb->dr_mode) {
 358         case USB_DR_MODE_PERIPHERAL:
 359                 ret = ssusb_gadget_init(ssusb);
 360                 if (ret) {
 361                         dev_err(dev, "failed to initialize gadget\n");
 362                         goto comm_exit;
 363                 }
 364                 break;
 365         case USB_DR_MODE_HOST:
 366                 ret = ssusb_host_init(ssusb, node);
 367                 if (ret) {
 368                         dev_err(dev, "failed to initialize host\n");
 369                         goto comm_exit;
 370                 }
 371                 break;
 372         case USB_DR_MODE_OTG:
 373                 ret = ssusb_gadget_init(ssusb);
 374                 if (ret) {
 375                         dev_err(dev, "failed to initialize gadget\n");
 376                         goto comm_exit;
 377                 }
 378
 379                 ret = ssusb_host_init(ssusb, node);
 380                 if (ret) {
 381                         dev_err(dev, "failed to initialize host\n");
 382                         goto gadget_exit;
 383                 }
 384
 385                 ssusb_otg_switch_init(ssusb);
 386                 break;
 387         default:
 388                 dev_err(dev, "unsupported mode: %d\n", ssusb->dr_mode);
 389                 ret = -EINVAL;
 390                 goto comm_exit;
 391         }
 392
 393         return 0;
 394
 395 gadget_exit:
 396         ssusb_gadget_exit(ssusb);
 397 comm_exit:
 398         ssusb_rscs_exit(ssusb);
 399 comm_init_err:
 400         pm_runtime_put_sync(dev);
 401         pm_runtime_disable(dev);
 402
 403         return ret;
 404 }
 405
 406 static int mtu3_remove(struct platform_device *pdev)
 407 {
 408         struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
 409
 410         switch (ssusb->dr_mode) {
 411         case USB_DR_MODE_PERIPHERAL:
 412                 ssusb_gadget_exit(ssusb);
 413                 break;
 414         case USB_DR_MODE_HOST:
 415                 ssusb_host_exit(ssusb);
 416                 break;
 417         case USB_DR_MODE_OTG:
 418                 ssusb_otg_switch_exit(ssusb);
 419                 ssusb_gadget_exit(ssusb);
 420                 ssusb_host_exit(ssusb);
 421                 break;
 422         default:
 423                 return -EINVAL;
 424         }
 425
 426         ssusb_rscs_exit(ssusb);
 427         pm_runtime_put_sync(&pdev->dev);
 428         pm_runtime_disable(&pdev->dev);
 429
 430         return 0;
 431 }
 432
 433 /*
 434  * when support dual-role mode, we reject suspend when
 435  * it works as device mode;
 436  */
 437 static int __maybe_unused mtu3_suspend(struct device *dev)
 438 {
 439         struct platform_device *pdev = to_platform_device(dev);
 440         struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
 441
 442         dev_dbg(dev, "%s\n", __func__);
 443
 444         /* REVISIT: disconnect it for only device mode? */
 445         if (!ssusb->is_host)
 446                 return 0;
 447
 448         ssusb_host_disable(ssusb, true);
 449         ssusb_phy_power_off(ssusb);
 450         clk_disable_unprepare(ssusb->sys_clk);
 451         clk_disable_unprepare(ssusb->ref_clk);
 452         ssusb_wakeup_enable(ssusb);
 453
 454         return 0;
 455 }
 456
 457 static int __maybe_unused mtu3_resume(struct device *dev)
 458 {
 459         struct platform_device *pdev = to_platform_device(dev);
 460         struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
 461
 462         dev_dbg(dev, "%s\n", __func__);
 463
 464         if (!ssusb->is_host)
 465                 return 0;
 466
 467         ssusb_wakeup_disable(ssusb);
 468         clk_prepare_enable(ssusb->sys_clk);
 469         clk_prepare_enable(ssusb->ref_clk);
 470         ssusb_phy_power_on(ssusb);
 471         ssusb_host_enable(ssusb);
 472
 473         return 0;
 474 }
 475
 476 static const struct dev_pm_ops mtu3_pm_ops = {
 477         SET_SYSTEM_SLEEP_PM_OPS(mtu3_suspend, mtu3_resume)
 478 };
 479
 480 #define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &mtu3_pm_ops : NULL)
 481
 482 #ifdef CONFIG_OF
 483
 484 static const struct of_device_id mtu3_of_match[] = {
 485         {.compatible = "mediatek,mt8173-mtu3",},
 486         {},
 487 };
 488
 489 MODULE_DEVICE_TABLE(of, mtu3_of_match);
 490
 491 #endif
 492
 493 static struct platform_driver mtu3_driver = {
 494         .probe = mtu3_probe,
 495         .remove = mtu3_remove,
 496         .driver = {
 497                 .name = MTU3_DRIVER_NAME,
 498                 .pm = DEV_PM_OPS,
 499                 .of_match_table = of_match_ptr(mtu3_of_match),
 500         },
 501 };
 502 module_platform_driver(mtu3_driver);
 503
 504 MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
 505 MODULE_LICENSE("GPL v2");
 506 MODULE_DESCRIPTION("MediaTek USB3 DRD Controller Driver");