drivers/phy/phy-rcar-gen3-usb2.c

   1 /*
   2  * Renesas R-Car Gen3 for USB2.0 PHY driver
   3  *
   4  * Copyright (C) 2015 Renesas Electronics Corporation
   5  *
   6  * This is based on the phy-rcar-gen2 driver:
   7  * Copyright (C) 2014 Renesas Solutions Corp.
   8  * Copyright (C) 2014 Cogent Embedded, Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/extcon.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/io.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/of_address.h>
  21 #include <linux/phy/phy.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/regulator/consumer.h>
  25 #include <linux/workqueue.h>
  26
  27 /******* USB2.0 Host registers (original offset is +0x200) *******/
  28 #define USB2_INT_ENABLE         0x000
  29 #define USB2_USBCTR             0x00c
  30 #define USB2_SPD_RSM_TIMSET     0x10c
  31 #define USB2_OC_TIMSET          0x110
  32 #define USB2_COMMCTRL           0x600
  33 #define USB2_OBINTSTA           0x604
  34 #define USB2_OBINTEN            0x608
  35 #define USB2_VBCTRL             0x60c
  36 #define USB2_LINECTRL1          0x610
  37 #define USB2_ADPCTRL            0x630
  38
  39 /* INT_ENABLE */
  40 #define USB2_INT_ENABLE_UCOM_INTEN      BIT(3)
  41 #define USB2_INT_ENABLE_USBH_INTB_EN    BIT(2)
  42 #define USB2_INT_ENABLE_USBH_INTA_EN    BIT(1)
  43 #define USB2_INT_ENABLE_INIT            (USB2_INT_ENABLE_UCOM_INTEN | \
  44                                          USB2_INT_ENABLE_USBH_INTB_EN | \
  45                                          USB2_INT_ENABLE_USBH_INTA_EN)
  46
  47 /* USBCTR */
  48 #define USB2_USBCTR_DIRPD       BIT(2)
  49 #define USB2_USBCTR_PLL_RST     BIT(1)
  50
  51 /* SPD_RSM_TIMSET */
  52 #define USB2_SPD_RSM_TIMSET_INIT        0x014e029b
  53
  54 /* OC_TIMSET */
  55 #define USB2_OC_TIMSET_INIT             0x000209ab
  56
  57 /* COMMCTRL */
  58 #define USB2_COMMCTRL_OTG_PERI          BIT(31) /* 1 = Peripheral mode */
  59
  60 /* OBINTSTA and OBINTEN */
  61 #define USB2_OBINT_SESSVLDCHG           BIT(12)
  62 #define USB2_OBINT_IDDIGCHG             BIT(11)
  63 #define USB2_OBINT_BITS                 (USB2_OBINT_SESSVLDCHG | \
  64                                          USB2_OBINT_IDDIGCHG)
  65
  66 /* VBCTRL */
  67 #define USB2_VBCTRL_DRVVBUSSEL          BIT(8)
  68
  69 /* LINECTRL1 */
  70 #define USB2_LINECTRL1_DPRPD_EN         BIT(19)
  71 #define USB2_LINECTRL1_DP_RPD           BIT(18)
  72 #define USB2_LINECTRL1_DMRPD_EN         BIT(17)
  73 #define USB2_LINECTRL1_DM_RPD           BIT(16)
  74 #define USB2_LINECTRL1_OPMODE_NODRV     BIT(6)
  75
  76 /* ADPCTRL */
  77 #define USB2_ADPCTRL_OTGSESSVLD         BIT(20)
  78 #define USB2_ADPCTRL_IDDIG              BIT(19)
  79 #define USB2_ADPCTRL_IDPULLUP           BIT(5)  /* 1 = ID sampling is enabled */
  80 #define USB2_ADPCTRL_DRVVBUS            BIT(4)
  81
  82 struct rcar_gen3_chan {
  83         void __iomem *base;
  84         struct extcon_dev *extcon;
  85         struct phy *phy;
  86         struct regulator *vbus;
  87         struct work_struct work;
  88         bool extcon_host;
  89         bool has_otg;
  90 };
  91
  92 static void rcar_gen3_phy_usb2_work(struct work_struct *work)
  93 {
  94         struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
  95                                                  work);
  96
  97         if (ch->extcon_host) {
  98                 extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, true);
  99                 extcon_set_state_sync(ch->extcon, EXTCON_USB, false);
 100         } else {
 101                 extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, false);
 102                 extcon_set_state_sync(ch->extcon, EXTCON_USB, true);
 103         }
 104 }
 105
 106 static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
 107 {
 108         void __iomem *usb2_base = ch->base;
 109         u32 val = readl(usb2_base + USB2_COMMCTRL);
 110
 111         dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, host);
 112         if (host)
 113                 val &= ~USB2_COMMCTRL_OTG_PERI;
 114         else
 115                 val |= USB2_COMMCTRL_OTG_PERI;
 116         writel(val, usb2_base + USB2_COMMCTRL);
 117 }
 118
 119 static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
 120 {
 121         void __iomem *usb2_base = ch->base;
 122         u32 val = readl(usb2_base + USB2_LINECTRL1);
 123
 124         dev_vdbg(&ch->phy->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
 125         val &= ~(USB2_LINECTRL1_DP_RPD | USB2_LINECTRL1_DM_RPD);
 126         if (dp)
 127                 val |= USB2_LINECTRL1_DP_RPD;
 128         if (dm)
 129                 val |= USB2_LINECTRL1_DM_RPD;
 130         writel(val, usb2_base + USB2_LINECTRL1);
 131 }
 132
 133 static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
 134 {
 135         void __iomem *usb2_base = ch->base;
 136         u32 val = readl(usb2_base + USB2_ADPCTRL);
 137
 138         dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, vbus);
 139         if (vbus)
 140                 val |= USB2_ADPCTRL_DRVVBUS;
 141         else
 142                 val &= ~USB2_ADPCTRL_DRVVBUS;
 143         writel(val, usb2_base + USB2_ADPCTRL);
 144 }
 145
 146 static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
 147 {
 148         rcar_gen3_set_linectrl(ch, 1, 1);
 149         rcar_gen3_set_host_mode(ch, 1);
 150         rcar_gen3_enable_vbus_ctrl(ch, 1);
 151
 152         ch->extcon_host = true;
 153         schedule_work(&ch->work);
 154 }
 155
 156 static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
 157 {
 158         rcar_gen3_set_linectrl(ch, 0, 1);
 159         rcar_gen3_set_host_mode(ch, 0);
 160         rcar_gen3_enable_vbus_ctrl(ch, 0);
 161
 162         ch->extcon_host = false;
 163         schedule_work(&ch->work);
 164 }
 165
 166 static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch)
 167 {
 168         void __iomem *usb2_base = ch->base;
 169         u32 val;
 170
 171         val = readl(usb2_base + USB2_LINECTRL1);
 172         writel(val | USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
 173
 174         rcar_gen3_set_linectrl(ch, 1, 1);
 175         rcar_gen3_set_host_mode(ch, 1);
 176         rcar_gen3_enable_vbus_ctrl(ch, 0);
 177
 178         val = readl(usb2_base + USB2_LINECTRL1);
 179         writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
 180 }
 181
 182 static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch)
 183 {
 184         rcar_gen3_set_linectrl(ch, 0, 1);
 185         rcar_gen3_set_host_mode(ch, 0);
 186         rcar_gen3_enable_vbus_ctrl(ch, 1);
 187 }
 188
 189 static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
 190 {
 191         void __iomem *usb2_base = ch->base;
 192         u32 val;
 193
 194         val = readl(usb2_base + USB2_OBINTEN);
 195         writel(val & ~USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
 196
 197         rcar_gen3_enable_vbus_ctrl(ch, 0);
 198         rcar_gen3_init_for_host(ch);
 199
 200         writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
 201 }
 202
 203 static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
 204 {
 205         return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
 206 }
 207
 208 static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
 209 {
 210         if (!rcar_gen3_check_id(ch))
 211                 rcar_gen3_init_for_host(ch);
 212         else
 213                 rcar_gen3_init_for_peri(ch);
 214 }
 215
 216 static bool rcar_gen3_is_host(struct rcar_gen3_chan *ch)
 217 {
 218         return !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI);
 219 }
 220
 221 static ssize_t role_store(struct device *dev, struct device_attribute *attr,
 222                           const char *buf, size_t count)
 223 {
 224         struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
 225         bool is_b_device, is_host, new_mode_is_host;
 226
 227         if (!ch->has_otg || !ch->phy->init_count)
 228                 return -EIO;
 229
 230         /*
 231          * is_b_device: true is B-Device. false is A-Device.
 232          * If {new_mode_}is_host: true is Host mode. false is Peripheral mode.
 233          */
 234         is_b_device = rcar_gen3_check_id(ch);
 235         is_host = rcar_gen3_is_host(ch);
 236         if (!strncmp(buf, "host", strlen("host")))
 237                 new_mode_is_host = true;
 238         else if (!strncmp(buf, "peripheral", strlen("peripheral")))
 239                 new_mode_is_host = false;
 240         else
 241                 return -EINVAL;
 242
 243         /* If current and new mode is the same, this returns the error */
 244         if (is_host == new_mode_is_host)
 245                 return -EINVAL;
 246
 247         if (new_mode_is_host) {         /* And is_host must be false */
 248                 if (!is_b_device)       /* A-Peripheral */
 249                         rcar_gen3_init_from_a_peri_to_a_host(ch);
 250                 else                    /* B-Peripheral */
 251                         rcar_gen3_init_for_b_host(ch);
 252         } else {                        /* And is_host must be true */
 253                 if (!is_b_device)       /* A-Host */
 254                         rcar_gen3_init_for_a_peri(ch);
 255                 else                    /* B-Host */
 256                         rcar_gen3_init_for_peri(ch);
 257         }
 258
 259         return count;
 260 }
 261
 262 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
 263                          char *buf)
 264 {
 265         struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
 266
 267         if (!ch->has_otg || !ch->phy->init_count)
 268                 return -EIO;
 269
 270         return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
 271                                                             "peripheral");
 272 }
 273 static DEVICE_ATTR_RW(role);
 274
 275 static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
 276 {
 277         void __iomem *usb2_base = ch->base;
 278         u32 val;
 279
 280         val = readl(usb2_base + USB2_VBCTRL);
 281         writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
 282         writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
 283         val = readl(usb2_base + USB2_OBINTEN);
 284         writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
 285         val = readl(usb2_base + USB2_ADPCTRL);
 286         writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
 287         val = readl(usb2_base + USB2_LINECTRL1);
 288         rcar_gen3_set_linectrl(ch, 0, 0);
 289         writel(val | USB2_LINECTRL1_DPRPD_EN | USB2_LINECTRL1_DMRPD_EN,
 290                usb2_base + USB2_LINECTRL1);
 291
 292         rcar_gen3_device_recognition(ch);
 293 }
 294
 295 static int rcar_gen3_phy_usb2_init(struct phy *p)
 296 {
 297         struct rcar_gen3_chan *channel = phy_get_drvdata(p);
 298         void __iomem *usb2_base = channel->base;
 299
 300         /* Initialize USB2 part */
 301         writel(USB2_INT_ENABLE_INIT, usb2_base + USB2_INT_ENABLE);
 302         writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
 303         writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
 304
 305         /* Initialize otg part */
 306         if (channel->has_otg)
 307                 rcar_gen3_init_otg(channel);
 308
 309         return 0;
 310 }
 311
 312 static int rcar_gen3_phy_usb2_exit(struct phy *p)
 313 {
 314         struct rcar_gen3_chan *channel = phy_get_drvdata(p);
 315
 316         writel(0, channel->base + USB2_INT_ENABLE);
 317
 318         return 0;
 319 }
 320
 321 static int rcar_gen3_phy_usb2_power_on(struct phy *p)
 322 {
 323         struct rcar_gen3_chan *channel = phy_get_drvdata(p);
 324         void __iomem *usb2_base = channel->base;
 325         u32 val;
 326         int ret;
 327
 328         if (channel->vbus) {
 329                 ret = regulator_enable(channel->vbus);
 330                 if (ret)
 331                         return ret;
 332         }
 333
 334         val = readl(usb2_base + USB2_USBCTR);
 335         val |= USB2_USBCTR_PLL_RST;
 336         writel(val, usb2_base + USB2_USBCTR);
 337         val &= ~USB2_USBCTR_PLL_RST;
 338         writel(val, usb2_base + USB2_USBCTR);
 339
 340         return 0;
 341 }
 342
 343 static int rcar_gen3_phy_usb2_power_off(struct phy *p)
 344 {
 345         struct rcar_gen3_chan *channel = phy_get_drvdata(p);
 346         int ret = 0;
 347
 348         if (channel->vbus)
 349                 ret = regulator_disable(channel->vbus);
 350
 351         return ret;
 352 }
 353
 354 static const struct phy_ops rcar_gen3_phy_usb2_ops = {
 355         .init           = rcar_gen3_phy_usb2_init,
 356         .exit           = rcar_gen3_phy_usb2_exit,
 357         .power_on       = rcar_gen3_phy_usb2_power_on,
 358         .power_off      = rcar_gen3_phy_usb2_power_off,
 359         .owner          = THIS_MODULE,
 360 };
 361
 362 static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
 363 {
 364         struct rcar_gen3_chan *ch = _ch;
 365         void __iomem *usb2_base = ch->base;
 366         u32 status = readl(usb2_base + USB2_OBINTSTA);
 367         irqreturn_t ret = IRQ_NONE;
 368
 369         if (status & USB2_OBINT_BITS) {
 370                 dev_vdbg(&ch->phy->dev, "%s: %08x\n", __func__, status);
 371                 writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
 372                 rcar_gen3_device_recognition(ch);
 373                 ret = IRQ_HANDLED;
 374         }
 375
 376         return ret;
 377 }
 378
 379 static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
 380         { .compatible = "renesas,usb2-phy-r8a7795" },
 381         { .compatible = "renesas,usb2-phy-r8a7796" },
 382         { .compatible = "renesas,rcar-gen3-usb2-phy" },
 383         { }
 384 };
 385 MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);
 386
 387 static const unsigned int rcar_gen3_phy_cable[] = {
 388         EXTCON_USB,
 389         EXTCON_USB_HOST,
 390         EXTCON_NONE,
 391 };
 392
 393 static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
 394 {
 395         struct device *dev = &pdev->dev;
 396         struct rcar_gen3_chan *channel;
 397         struct phy_provider *provider;
 398         struct resource *res;
 399         int irq, ret = 0;
 400
 401         if (!dev->of_node) {
 402                 dev_err(dev, "This driver needs device tree\n");
 403                 return -EINVAL;
 404         }
 405
 406         channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
 407         if (!channel)
 408                 return -ENOMEM;
 409
 410         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 411         channel->base = devm_ioremap_resource(dev, res);
 412         if (IS_ERR(channel->base))
 413                 return PTR_ERR(channel->base);
 414
 415         /* call request_irq for OTG */
 416         irq = platform_get_irq(pdev, 0);
 417         if (irq >= 0) {
 418                 int ret;
 419
 420                 INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
 421                 irq = devm_request_irq(dev, irq, rcar_gen3_phy_usb2_irq,
 422                                        IRQF_SHARED, dev_name(dev), channel);
 423                 if (irq < 0)
 424                         dev_err(dev, "No irq handler (%d)\n", irq);
 425                 channel->has_otg = true;
 426                 channel->extcon = devm_extcon_dev_allocate(dev,
 427                                                         rcar_gen3_phy_cable);
 428                 if (IS_ERR(channel->extcon))
 429                         return PTR_ERR(channel->extcon);
 430
 431                 ret = devm_extcon_dev_register(dev, channel->extcon);
 432                 if (ret < 0) {
 433                         dev_err(dev, "Failed to register extcon\n");
 434                         return ret;
 435                 }
 436         }
 437
 438         /*
 439          * devm_phy_create() will call pm_runtime_enable(&phy->dev);
 440          * And then, phy-core will manage runtime pm for this device.
 441          */
 442         pm_runtime_enable(dev);
 443         channel->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb2_ops);
 444         if (IS_ERR(channel->phy)) {
 445                 dev_err(dev, "Failed to create USB2 PHY\n");
 446                 ret = PTR_ERR(channel->phy);
 447                 goto error;
 448         }
 449
 450         channel->vbus = devm_regulator_get_optional(dev, "vbus");
 451         if (IS_ERR(channel->vbus)) {
 452                 if (PTR_ERR(channel->vbus) == -EPROBE_DEFER) {
 453                         ret = PTR_ERR(channel->vbus);
 454                         goto error;
 455                 }
 456                 channel->vbus = NULL;
 457         }
 458
 459         platform_set_drvdata(pdev, channel);
 460         phy_set_drvdata(channel->phy, channel);
 461
 462         provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 463         if (IS_ERR(provider)) {
 464                 dev_err(dev, "Failed to register PHY provider\n");
 465                 ret = PTR_ERR(provider);
 466                 goto error;
 467         } else if (channel->has_otg) {
 468                 int ret;
 469
 470                 ret = device_create_file(dev, &dev_attr_role);
 471                 if (ret < 0)
 472                         goto error;
 473         }
 474
 475         return 0;
 476
 477 error:
 478         pm_runtime_disable(dev);
 479
 480         return ret;
 481 }
 482
 483 static int rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
 484 {
 485         struct rcar_gen3_chan *channel = platform_get_drvdata(pdev);
 486
 487         if (channel->has_otg)
 488                 device_remove_file(&pdev->dev, &dev_attr_role);
 489
 490         pm_runtime_disable(&pdev->dev);
 491
 492         return 0;
 493 };
 494
 495 static struct platform_driver rcar_gen3_phy_usb2_driver = {
 496         .driver = {
 497                 .name           = "phy_rcar_gen3_usb2",
 498                 .of_match_table = rcar_gen3_phy_usb2_match_table,
 499         },
 500         .probe  = rcar_gen3_phy_usb2_probe,
 501         .remove = rcar_gen3_phy_usb2_remove,
 502 };
 503 module_platform_driver(rcar_gen3_phy_usb2_driver);
 504
 505 MODULE_LICENSE("GPL v2");
 506 MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
 507 MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");