drivers/usb/phy/phy-samsung-usb2.c

   1 /* linux/drivers/usb/phy/phy-samsung-usb2.c
   2  *
   3  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * Author: Praveen Paneri <p.paneri@samsung.com>
   7  *
   8  * Samsung USB2.0 PHY transceiver; talks to S3C HS OTG controller, EHCI-S5P and
   9  * OHCI-EXYNOS controllers.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/clk.h>
  24 #include <linux/delay.h>
  25 #include <linux/device.h>
  26 #include <linux/err.h>
  27 #include <linux/io.h>
  28 #include <linux/of.h>
  29 #include <linux/usb/otg.h>
  30 #include <linux/usb/samsung_usb_phy.h>
  31 #include <linux/platform_data/samsung-usbphy.h>
  32
  33 #include "phy-samsung-usb.h"
  34
  35 static int samsung_usbphy_set_host(struct usb_otg *otg, struct usb_bus *host)
  36 {
  37         if (!otg)
  38                 return -ENODEV;
  39
  40         if (!otg->host)
  41                 otg->host = host;
  42
  43         return 0;
  44 }
  45
  46 static bool exynos5_phyhost_is_on(void __iomem *regs)
  47 {
  48         u32 reg;
  49
  50         reg = readl(regs + EXYNOS5_PHY_HOST_CTRL0);
  51
  52         return !(reg & HOST_CTRL0_SIDDQ);
  53 }
  54
  55 static void samsung_exynos5_usb2phy_enable(struct samsung_usbphy *sphy)
  56 {
  57         void __iomem *regs = sphy->regs;
  58         u32 phyclk = sphy->ref_clk_freq;
  59         u32 phyhost;
  60         u32 phyotg;
  61         u32 phyhsic;
  62         u32 ehcictrl;
  63         u32 ohcictrl;
  64
  65         /*
  66          * phy_usage helps in keeping usage count for phy
  67          * so that the first consumer enabling the phy is also
  68          * the last consumer to disable it.
  69          */
  70
  71         atomic_inc(&sphy->phy_usage);
  72
  73         if (exynos5_phyhost_is_on(regs)) {
  74                 dev_info(sphy->dev, "Already power on PHY\n");
  75                 return;
  76         }
  77
  78         /* Host configuration */
  79         phyhost = readl(regs + EXYNOS5_PHY_HOST_CTRL0);
  80
  81         /* phy reference clock configuration */
  82         phyhost &= ~HOST_CTRL0_FSEL_MASK;
  83         phyhost |= HOST_CTRL0_FSEL(phyclk);
  84
  85         /* host phy reset */
  86         phyhost &= ~(HOST_CTRL0_PHYSWRST |
  87                         HOST_CTRL0_PHYSWRSTALL |
  88                         HOST_CTRL0_SIDDQ |
  89                         /* Enable normal mode of operation */
  90                         HOST_CTRL0_FORCESUSPEND |
  91                         HOST_CTRL0_FORCESLEEP);
  92
  93         /* Link reset */
  94         phyhost |= (HOST_CTRL0_LINKSWRST |
  95                         HOST_CTRL0_UTMISWRST |
  96                         /* COMMON Block configuration during suspend */
  97                         HOST_CTRL0_COMMONON_N);
  98         writel(phyhost, regs + EXYNOS5_PHY_HOST_CTRL0);
  99         udelay(10);
 100         phyhost &= ~(HOST_CTRL0_LINKSWRST |
 101                         HOST_CTRL0_UTMISWRST);
 102         writel(phyhost, regs + EXYNOS5_PHY_HOST_CTRL0);
 103
 104         /* OTG configuration */
 105         phyotg = readl(regs + EXYNOS5_PHY_OTG_SYS);
 106
 107         /* phy reference clock configuration */
 108         phyotg &= ~OTG_SYS_FSEL_MASK;
 109         phyotg |= OTG_SYS_FSEL(phyclk);
 110
 111         /* Enable normal mode of operation */
 112         phyotg &= ~(OTG_SYS_FORCESUSPEND |
 113                         OTG_SYS_SIDDQ_UOTG |
 114                         OTG_SYS_FORCESLEEP |
 115                         OTG_SYS_REFCLKSEL_MASK |
 116                         /* COMMON Block configuration during suspend */
 117                         OTG_SYS_COMMON_ON);
 118
 119         /* OTG phy & link reset */
 120         phyotg |= (OTG_SYS_PHY0_SWRST |
 121                         OTG_SYS_LINKSWRST_UOTG |
 122                         OTG_SYS_PHYLINK_SWRESET |
 123                         OTG_SYS_OTGDISABLE |
 124                         /* Set phy refclk */
 125                         OTG_SYS_REFCLKSEL_CLKCORE);
 126
 127         writel(phyotg, regs + EXYNOS5_PHY_OTG_SYS);
 128         udelay(10);
 129         phyotg &= ~(OTG_SYS_PHY0_SWRST |
 130                         OTG_SYS_LINKSWRST_UOTG |
 131                         OTG_SYS_PHYLINK_SWRESET);
 132         writel(phyotg, regs + EXYNOS5_PHY_OTG_SYS);
 133
 134         /* HSIC phy configuration */
 135         phyhsic = (HSIC_CTRL_REFCLKDIV_12 |
 136                         HSIC_CTRL_REFCLKSEL |
 137                         HSIC_CTRL_PHYSWRST);
 138         writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL1);
 139         writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL2);
 140         udelay(10);
 141         phyhsic &= ~HSIC_CTRL_PHYSWRST;
 142         writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL1);
 143         writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL2);
 144
 145         udelay(80);
 146
 147         /* enable EHCI DMA burst */
 148         ehcictrl = readl(regs + EXYNOS5_PHY_HOST_EHCICTRL);
 149         ehcictrl |= (HOST_EHCICTRL_ENAINCRXALIGN |
 150                                 HOST_EHCICTRL_ENAINCR4 |
 151                                 HOST_EHCICTRL_ENAINCR8 |
 152                                 HOST_EHCICTRL_ENAINCR16);
 153         writel(ehcictrl, regs + EXYNOS5_PHY_HOST_EHCICTRL);
 154
 155         /* set ohci_suspend_on_n */
 156         ohcictrl = readl(regs + EXYNOS5_PHY_HOST_OHCICTRL);
 157         ohcictrl |= HOST_OHCICTRL_SUSPLGCY;
 158         writel(ohcictrl, regs + EXYNOS5_PHY_HOST_OHCICTRL);
 159 }
 160
 161 static void samsung_usb2phy_enable(struct samsung_usbphy *sphy)
 162 {
 163         void __iomem *regs = sphy->regs;
 164         u32 phypwr;
 165         u32 phyclk;
 166         u32 rstcon;
 167
 168         /* set clock frequency for PLL */
 169         phyclk = sphy->ref_clk_freq;
 170         phypwr = readl(regs + SAMSUNG_PHYPWR);
 171         rstcon = readl(regs + SAMSUNG_RSTCON);
 172
 173         switch (sphy->drv_data->cpu_type) {
 174         case TYPE_S3C64XX:
 175                 phyclk &= ~PHYCLK_COMMON_ON_N;
 176                 phypwr &= ~PHYPWR_NORMAL_MASK;
 177                 rstcon |= RSTCON_SWRST;
 178                 break;
 179         case TYPE_EXYNOS4210:
 180                 phypwr &= ~PHYPWR_NORMAL_MASK_PHY0;
 181                 rstcon |= RSTCON_SWRST;
 182         default:
 183                 break;
 184         }
 185
 186         writel(phyclk, regs + SAMSUNG_PHYCLK);
 187         /* Configure PHY0 for normal operation*/
 188         writel(phypwr, regs + SAMSUNG_PHYPWR);
 189         /* reset all ports of PHY and Link */
 190         writel(rstcon, regs + SAMSUNG_RSTCON);
 191         udelay(10);
 192         rstcon &= ~RSTCON_SWRST;
 193         writel(rstcon, regs + SAMSUNG_RSTCON);
 194 }
 195
 196 static void samsung_exynos5_usb2phy_disable(struct samsung_usbphy *sphy)
 197 {
 198         void __iomem *regs = sphy->regs;
 199         u32 phyhost;
 200         u32 phyotg;
 201         u32 phyhsic;
 202
 203         if (atomic_dec_return(&sphy->phy_usage) > 0) {
 204                 dev_info(sphy->dev, "still being used\n");
 205                 return;
 206         }
 207
 208         phyhsic = (HSIC_CTRL_REFCLKDIV_12 |
 209                         HSIC_CTRL_REFCLKSEL |
 210                         HSIC_CTRL_SIDDQ |
 211                         HSIC_CTRL_FORCESLEEP |
 212                         HSIC_CTRL_FORCESUSPEND);
 213         writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL1);
 214         writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL2);
 215
 216         phyhost = readl(regs + EXYNOS5_PHY_HOST_CTRL0);
 217         phyhost |= (HOST_CTRL0_SIDDQ |
 218                         HOST_CTRL0_FORCESUSPEND |
 219                         HOST_CTRL0_FORCESLEEP |
 220                         HOST_CTRL0_PHYSWRST |
 221                         HOST_CTRL0_PHYSWRSTALL);
 222         writel(phyhost, regs + EXYNOS5_PHY_HOST_CTRL0);
 223
 224         phyotg = readl(regs + EXYNOS5_PHY_OTG_SYS);
 225         phyotg |= (OTG_SYS_FORCESUSPEND |
 226                         OTG_SYS_SIDDQ_UOTG |
 227                         OTG_SYS_FORCESLEEP);
 228         writel(phyotg, regs + EXYNOS5_PHY_OTG_SYS);
 229 }
 230
 231 static void samsung_usb2phy_disable(struct samsung_usbphy *sphy)
 232 {
 233         void __iomem *regs = sphy->regs;
 234         u32 phypwr;
 235
 236         phypwr = readl(regs + SAMSUNG_PHYPWR);
 237
 238         switch (sphy->drv_data->cpu_type) {
 239         case TYPE_S3C64XX:
 240                 phypwr |= PHYPWR_NORMAL_MASK;
 241                 break;
 242         case TYPE_EXYNOS4210:
 243                 phypwr |= PHYPWR_NORMAL_MASK_PHY0;
 244         default:
 245                 break;
 246         }
 247
 248         /* Disable analog and otg block power */
 249         writel(phypwr, regs + SAMSUNG_PHYPWR);
 250 }
 251
 252 /*
 253  * The function passed to the usb driver for phy initialization
 254  */
 255 static int samsung_usb2phy_init(struct usb_phy *phy)
 256 {
 257         struct samsung_usbphy *sphy;
 258         struct usb_bus *host = NULL;
 259         unsigned long flags;
 260         int ret = 0;
 261
 262         sphy = phy_to_sphy(phy);
 263
 264         host = phy->otg->host;
 265
 266         /* Enable the phy clock */
 267         ret = clk_prepare_enable(sphy->clk);
 268         if (ret) {
 269                 dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
 270                 return ret;
 271         }
 272
 273         spin_lock_irqsave(&sphy->lock, flags);
 274
 275         if (host) {
 276                 /* setting default phy-type for USB 2.0 */
 277                 if (!strstr(dev_name(host->controller), "ehci") ||
 278                                 !strstr(dev_name(host->controller), "ohci"))
 279                         samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_HOST);
 280         } else {
 281                 samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_DEVICE);
 282         }
 283
 284         /* Disable phy isolation */
 285         if (sphy->plat && sphy->plat->pmu_isolation)
 286                 sphy->plat->pmu_isolation(false);
 287         else
 288                 samsung_usbphy_set_isolation(sphy, false);
 289
 290         /* Selecting Host/OTG mode; After reset USB2.0PHY_CFG: HOST */
 291         samsung_usbphy_cfg_sel(sphy);
 292
 293         /* Initialize usb phy registers */
 294         if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
 295                 samsung_exynos5_usb2phy_enable(sphy);
 296         else
 297                 samsung_usb2phy_enable(sphy);
 298
 299         spin_unlock_irqrestore(&sphy->lock, flags);
 300
 301         /* Disable the phy clock */
 302         clk_disable_unprepare(sphy->clk);
 303
 304         return ret;
 305 }
 306
 307 /*
 308  * The function passed to the usb driver for phy shutdown
 309  */
 310 static void samsung_usb2phy_shutdown(struct usb_phy *phy)
 311 {
 312         struct samsung_usbphy *sphy;
 313         struct usb_bus *host = NULL;
 314         unsigned long flags;
 315
 316         sphy = phy_to_sphy(phy);
 317
 318         host = phy->otg->host;
 319
 320         if (clk_prepare_enable(sphy->clk)) {
 321                 dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
 322                 return;
 323         }
 324
 325         spin_lock_irqsave(&sphy->lock, flags);
 326
 327         if (host) {
 328                 /* setting default phy-type for USB 2.0 */
 329                 if (!strstr(dev_name(host->controller), "ehci") ||
 330                                 !strstr(dev_name(host->controller), "ohci"))
 331                         samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_HOST);
 332         } else {
 333                 samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_DEVICE);
 334         }
 335
 336         /* De-initialize usb phy registers */
 337         if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
 338                 samsung_exynos5_usb2phy_disable(sphy);
 339         else
 340                 samsung_usb2phy_disable(sphy);
 341
 342         /* Enable phy isolation */
 343         if (sphy->plat && sphy->plat->pmu_isolation)
 344                 sphy->plat->pmu_isolation(true);
 345         else
 346                 samsung_usbphy_set_isolation(sphy, true);
 347
 348         spin_unlock_irqrestore(&sphy->lock, flags);
 349
 350         clk_disable_unprepare(sphy->clk);
 351 }
 352
 353 static int samsung_usb2phy_probe(struct platform_device *pdev)
 354 {
 355         struct samsung_usbphy *sphy;
 356         struct usb_otg *otg;
 357         struct samsung_usbphy_data *pdata = pdev->dev.platform_data;
 358         const struct samsung_usbphy_drvdata *drv_data;
 359         struct device *dev = &pdev->dev;
 360         struct resource *phy_mem;
 361         void __iomem    *phy_base;
 362         struct clk *clk;
 363         int ret;
 364
 365         phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 366         if (!phy_mem) {
 367                 dev_err(dev, "%s: missing mem resource\n", __func__);
 368                 return -ENODEV;
 369         }
 370
 371         phy_base = devm_ioremap_resource(dev, phy_mem);
 372         if (IS_ERR(phy_base))
 373                 return PTR_ERR(phy_base);
 374
 375         sphy = devm_kzalloc(dev, sizeof(*sphy), GFP_KERNEL);
 376         if (!sphy)
 377                 return -ENOMEM;
 378
 379         otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
 380         if (!otg)
 381                 return -ENOMEM;
 382
 383         drv_data = samsung_usbphy_get_driver_data(pdev);
 384
 385         if (drv_data->cpu_type == TYPE_EXYNOS5250)
 386                 clk = devm_clk_get(dev, "usbhost");
 387         else
 388                 clk = devm_clk_get(dev, "otg");
 389
 390         if (IS_ERR(clk)) {
 391                 dev_err(dev, "Failed to get otg clock\n");
 392                 return PTR_ERR(clk);
 393         }
 394
 395         sphy->dev = dev;
 396
 397         if (dev->of_node) {
 398                 ret = samsung_usbphy_parse_dt(sphy);
 399                 if (ret < 0)
 400                         return ret;
 401         } else {
 402                 if (!pdata) {
 403                         dev_err(dev, "no platform data specified\n");
 404                         return -EINVAL;
 405                 }
 406         }
 407
 408         sphy->plat              = pdata;
 409         sphy->regs              = phy_base;
 410         sphy->clk               = clk;
 411         sphy->drv_data          = drv_data;
 412         sphy->phy.dev           = sphy->dev;
 413         sphy->phy.label         = "samsung-usb2phy";
 414         sphy->phy.init          = samsung_usb2phy_init;
 415         sphy->phy.shutdown      = samsung_usb2phy_shutdown;
 416         sphy->ref_clk_freq      = samsung_usbphy_get_refclk_freq(sphy);
 417
 418         sphy->phy.otg           = otg;
 419         sphy->phy.otg->phy      = &sphy->phy;
 420         sphy->phy.otg->set_host = samsung_usbphy_set_host;
 421
 422         spin_lock_init(&sphy->lock);
 423
 424         platform_set_drvdata(pdev, sphy);
 425
 426         return usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2);
 427 }
 428
 429 static int samsung_usb2phy_remove(struct platform_device *pdev)
 430 {
 431         struct samsung_usbphy *sphy = platform_get_drvdata(pdev);
 432
 433         usb_remove_phy(&sphy->phy);
 434
 435         if (sphy->pmuregs)
 436                 iounmap(sphy->pmuregs);
 437         if (sphy->sysreg)
 438                 iounmap(sphy->sysreg);
 439
 440         return 0;
 441 }
 442
 443 static const struct samsung_usbphy_drvdata usb2phy_s3c64xx = {
 444         .cpu_type               = TYPE_S3C64XX,
 445         .devphy_en_mask         = S3C64XX_USBPHY_ENABLE,
 446 };
 447
 448 static const struct samsung_usbphy_drvdata usb2phy_exynos4 = {
 449         .cpu_type               = TYPE_EXYNOS4210,
 450         .devphy_en_mask         = EXYNOS_USBPHY_ENABLE,
 451         .hostphy_en_mask        = EXYNOS_USBPHY_ENABLE,
 452 };
 453
 454 static struct samsung_usbphy_drvdata usb2phy_exynos5 = {
 455         .cpu_type               = TYPE_EXYNOS5250,
 456         .hostphy_en_mask        = EXYNOS_USBPHY_ENABLE,
 457         .hostphy_reg_offset     = EXYNOS_USBHOST_PHY_CTRL_OFFSET,
 458 };
 459
 460 #ifdef CONFIG_OF
 461 static const struct of_device_id samsung_usbphy_dt_match[] = {
 462         {
 463                 .compatible = "samsung,s3c64xx-usb2phy",
 464                 .data = &usb2phy_s3c64xx,
 465         }, {
 466                 .compatible = "samsung,exynos4210-usb2phy",
 467                 .data = &usb2phy_exynos4,
 468         }, {
 469                 .compatible = "samsung,exynos5250-usb2phy",
 470                 .data = &usb2phy_exynos5
 471         },
 472         {},
 473 };
 474 MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match);
 475 #endif
 476
 477 static struct platform_device_id samsung_usbphy_driver_ids[] = {
 478         {
 479                 .name           = "s3c64xx-usb2phy",
 480                 .driver_data    = (unsigned long)&usb2phy_s3c64xx,
 481         }, {
 482                 .name           = "exynos4210-usb2phy",
 483                 .driver_data    = (unsigned long)&usb2phy_exynos4,
 484         }, {
 485                 .name           = "exynos5250-usb2phy",
 486                 .driver_data    = (unsigned long)&usb2phy_exynos5,
 487         },
 488         {},
 489 };
 490
 491 MODULE_DEVICE_TABLE(platform, samsung_usbphy_driver_ids);
 492
 493 static struct platform_driver samsung_usb2phy_driver = {
 494         .probe          = samsung_usb2phy_probe,
 495         .remove         = samsung_usb2phy_remove,
 496         .id_table       = samsung_usbphy_driver_ids,
 497         .driver         = {
 498                 .name   = "samsung-usb2phy",
 499                 .owner  = THIS_MODULE,
 500                 .of_match_table = of_match_ptr(samsung_usbphy_dt_match),
 501         },
 502 };
 503
 504 module_platform_driver(samsung_usb2phy_driver);
 505
 506 MODULE_DESCRIPTION("Samsung USB 2.0 phy controller");
 507 MODULE_AUTHOR("Praveen Paneri <p.paneri@samsung.com>");
 508 MODULE_LICENSE("GPL");
 509 MODULE_ALIAS("platform:samsung-usb2phy");