drivers/usb/phy/phy-mxs-usb.c

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This source file includes following definitions.
is_imx6q_phy
is_imx6sl_phy
is_imx7ulp_phy
mxs_phy_clock_switch_delay
mxs_phy_tx_init
mxs_phy_pll_enable
mxs_phy_hw_init
mxs_phy_get_vbus_status
__mxs_phy_disconnect_line
mxs_phy_is_otg_host
mxs_phy_disconnect_line
mxs_phy_init
mxs_phy_shutdown
mxs_phy_is_low_speed_connection
mxs_phy_suspend
mxs_phy_set_wakeup
mxs_phy_on_connect
mxs_phy_on_disconnect
mxs_charger_data_contact_detect
mxs_charger_primary_detection
mxs_charger_secondary_detection
mxs_phy_charger_detect
mxs_phy_probe
mxs_phy_remove
mxs_phy_enable_ldo_in_suspend
mxs_phy_system_suspend
mxs_phy_system_resume
mxs_phy_module_init
mxs_phy_module_exit
   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2012-2014 Freescale Semiconductor, Inc.
   4  * Copyright (C) 2012 Marek Vasut <marex@denx.de>
   5  * on behalf of DENX Software Engineering GmbH
   6  */
   7 
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/clk.h>
  12 #include <linux/usb/otg.h>
  13 #include <linux/stmp_device.h>
  14 #include <linux/delay.h>
  15 #include <linux/err.h>
  16 #include <linux/io.h>
  17 #include <linux/of_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/mfd/syscon.h>
  20 #include <linux/iopoll.h>
  21 
  22 #define DRIVER_NAME "mxs_phy"
  23 
  24 /* Register Macro */
  25 #define HW_USBPHY_PWD                           0x00
  26 #define HW_USBPHY_TX                            0x10
  27 #define HW_USBPHY_CTRL                          0x30
  28 #define HW_USBPHY_CTRL_SET                      0x34
  29 #define HW_USBPHY_CTRL_CLR                      0x38
  30 
  31 #define HW_USBPHY_DEBUG_SET                     0x54
  32 #define HW_USBPHY_DEBUG_CLR                     0x58
  33 
  34 #define HW_USBPHY_IP                            0x90
  35 #define HW_USBPHY_IP_SET                        0x94
  36 #define HW_USBPHY_IP_CLR                        0x98
  37 
  38 #define GM_USBPHY_TX_TXCAL45DP(x)            (((x) & 0xf) << 16)
  39 #define GM_USBPHY_TX_TXCAL45DN(x)            (((x) & 0xf) << 8)
  40 #define GM_USBPHY_TX_D_CAL(x)                (((x) & 0xf) << 0)
  41 
  42 /* imx7ulp */
  43 #define HW_USBPHY_PLL_SIC                       0xa0
  44 #define HW_USBPHY_PLL_SIC_SET                   0xa4
  45 #define HW_USBPHY_PLL_SIC_CLR                   0xa8
  46 
  47 #define BM_USBPHY_CTRL_SFTRST                   BIT(31)
  48 #define BM_USBPHY_CTRL_CLKGATE                  BIT(30)
  49 #define BM_USBPHY_CTRL_OTG_ID_VALUE             BIT(27)
  50 #define BM_USBPHY_CTRL_ENAUTOSET_USBCLKS        BIT(26)
  51 #define BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE     BIT(25)
  52 #define BM_USBPHY_CTRL_ENVBUSCHG_WKUP           BIT(23)
  53 #define BM_USBPHY_CTRL_ENIDCHG_WKUP             BIT(22)
  54 #define BM_USBPHY_CTRL_ENDPDMCHG_WKUP           BIT(21)
  55 #define BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD        BIT(20)
  56 #define BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE        BIT(19)
  57 #define BM_USBPHY_CTRL_ENAUTO_PWRON_PLL         BIT(18)
  58 #define BM_USBPHY_CTRL_ENUTMILEVEL3             BIT(15)
  59 #define BM_USBPHY_CTRL_ENUTMILEVEL2             BIT(14)
  60 #define BM_USBPHY_CTRL_ENHOSTDISCONDETECT       BIT(1)
  61 
  62 #define BM_USBPHY_IP_FIX                       (BIT(17) | BIT(18))
  63 
  64 #define BM_USBPHY_DEBUG_CLKGATE                 BIT(30)
  65 /* imx7ulp */
  66 #define BM_USBPHY_PLL_LOCK                      BIT(31)
  67 #define BM_USBPHY_PLL_REG_ENABLE                BIT(21)
  68 #define BM_USBPHY_PLL_BYPASS                    BIT(16)
  69 #define BM_USBPHY_PLL_POWER                     BIT(12)
  70 #define BM_USBPHY_PLL_EN_USB_CLKS               BIT(6)
  71 
  72 /* Anatop Registers */
  73 #define ANADIG_ANA_MISC0                        0x150
  74 #define ANADIG_ANA_MISC0_SET                    0x154
  75 #define ANADIG_ANA_MISC0_CLR                    0x158
  76 
  77 #define ANADIG_USB1_CHRG_DETECT_SET             0x1b4
  78 #define ANADIG_USB1_CHRG_DETECT_CLR             0x1b8
  79 #define ANADIG_USB2_CHRG_DETECT_SET             0x214
  80 #define ANADIG_USB1_CHRG_DETECT_EN_B            BIT(20)
  81 #define ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B      BIT(19)
  82 #define ANADIG_USB1_CHRG_DETECT_CHK_CONTACT     BIT(18)
  83 
  84 #define ANADIG_USB1_VBUS_DET_STAT               0x1c0
  85 #define ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID    BIT(3)
  86 
  87 #define ANADIG_USB1_CHRG_DET_STAT               0x1d0
  88 #define ANADIG_USB1_CHRG_DET_STAT_DM_STATE      BIT(2)
  89 #define ANADIG_USB1_CHRG_DET_STAT_CHRG_DETECTED BIT(1)
  90 #define ANADIG_USB1_CHRG_DET_STAT_PLUG_CONTACT  BIT(0)
  91 
  92 #define ANADIG_USB2_VBUS_DET_STAT               0x220
  93 
  94 #define ANADIG_USB1_LOOPBACK_SET                0x1e4
  95 #define ANADIG_USB1_LOOPBACK_CLR                0x1e8
  96 #define ANADIG_USB1_LOOPBACK_UTMI_TESTSTART     BIT(0)
  97 
  98 #define ANADIG_USB2_LOOPBACK_SET                0x244
  99 #define ANADIG_USB2_LOOPBACK_CLR                0x248
 100 
 101 #define ANADIG_USB1_MISC                        0x1f0
 102 #define ANADIG_USB2_MISC                        0x250
 103 
 104 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG    BIT(12)
 105 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL BIT(11)
 106 
 107 #define BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID BIT(3)
 108 #define BM_ANADIG_USB2_VBUS_DET_STAT_VBUS_VALID BIT(3)
 109 
 110 #define BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1   BIT(2)
 111 #define BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN      BIT(5)
 112 #define BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1   BIT(2)
 113 #define BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN      BIT(5)
 114 
 115 #define BM_ANADIG_USB1_MISC_RX_VPIN_FS          BIT(29)
 116 #define BM_ANADIG_USB1_MISC_RX_VMIN_FS          BIT(28)
 117 #define BM_ANADIG_USB2_MISC_RX_VPIN_FS          BIT(29)
 118 #define BM_ANADIG_USB2_MISC_RX_VMIN_FS          BIT(28)
 119 
 120 #define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
 121 
 122 /* Do disconnection between PHY and controller without vbus */
 123 #define MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS    BIT(0)
 124 
 125 /*
 126  * The PHY will be in messy if there is a wakeup after putting
 127  * bus to suspend (set portsc.suspendM) but before setting PHY to low
 128  * power mode (set portsc.phcd).
 129  */
 130 #define MXS_PHY_ABNORMAL_IN_SUSPEND             BIT(1)
 131 
 132 /*
 133  * The SOF sends too fast after resuming, it will cause disconnection
 134  * between host and high speed device.
 135  */
 136 #define MXS_PHY_SENDING_SOF_TOO_FAST            BIT(2)
 137 
 138 /*
 139  * IC has bug fixes logic, they include
 140  * MXS_PHY_ABNORMAL_IN_SUSPEND and MXS_PHY_SENDING_SOF_TOO_FAST
 141  * which are described at above flags, the RTL will handle it
 142  * according to different versions.
 143  */
 144 #define MXS_PHY_NEED_IP_FIX                     BIT(3)
 145 
 146 /* Minimum and maximum values for device tree entries */
 147 #define MXS_PHY_TX_CAL45_MIN                    30
 148 #define MXS_PHY_TX_CAL45_MAX                    55
 149 #define MXS_PHY_TX_D_CAL_MIN                    79
 150 #define MXS_PHY_TX_D_CAL_MAX                    119
 151 
 152 struct mxs_phy_data {
 153         unsigned int flags;
 154 };
 155 
 156 static const struct mxs_phy_data imx23_phy_data = {
 157         .flags = MXS_PHY_ABNORMAL_IN_SUSPEND | MXS_PHY_SENDING_SOF_TOO_FAST,
 158 };
 159 
 160 static const struct mxs_phy_data imx6q_phy_data = {
 161         .flags = MXS_PHY_SENDING_SOF_TOO_FAST |
 162                 MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
 163                 MXS_PHY_NEED_IP_FIX,
 164 };
 165 
 166 static const struct mxs_phy_data imx6sl_phy_data = {
 167         .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
 168                 MXS_PHY_NEED_IP_FIX,
 169 };
 170 
 171 static const struct mxs_phy_data vf610_phy_data = {
 172         .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
 173                 MXS_PHY_NEED_IP_FIX,
 174 };
 175 
 176 static const struct mxs_phy_data imx6sx_phy_data = {
 177         .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS,
 178 };
 179 
 180 static const struct mxs_phy_data imx6ul_phy_data = {
 181         .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS,
 182 };
 183 
 184 static const struct mxs_phy_data imx7ulp_phy_data = {
 185 };
 186 
 187 static const struct of_device_id mxs_phy_dt_ids[] = {
 188         { .compatible = "fsl,imx6sx-usbphy", .data = &imx6sx_phy_data, },
 189         { .compatible = "fsl,imx6sl-usbphy", .data = &imx6sl_phy_data, },
 190         { .compatible = "fsl,imx6q-usbphy", .data = &imx6q_phy_data, },
 191         { .compatible = "fsl,imx23-usbphy", .data = &imx23_phy_data, },
 192         { .compatible = "fsl,vf610-usbphy", .data = &vf610_phy_data, },
 193         { .compatible = "fsl,imx6ul-usbphy", .data = &imx6ul_phy_data, },
 194         { .compatible = "fsl,imx7ulp-usbphy", .data = &imx7ulp_phy_data, },
 195         { /* sentinel */ }
 196 };
 197 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
 198 
 199 struct mxs_phy {
 200         struct usb_phy phy;
 201         struct clk *clk;
 202         const struct mxs_phy_data *data;
 203         struct regmap *regmap_anatop;
 204         int port_id;
 205         u32 tx_reg_set;
 206         u32 tx_reg_mask;
 207 };
 208 
 209 static inline bool is_imx6q_phy(struct mxs_phy *mxs_phy)
 210 {
 211         return mxs_phy->data == &imx6q_phy_data;
 212 }
 213 
 214 static inline bool is_imx6sl_phy(struct mxs_phy *mxs_phy)
 215 {
 216         return mxs_phy->data == &imx6sl_phy_data;
 217 }
 218 
 219 static inline bool is_imx7ulp_phy(struct mxs_phy *mxs_phy)
 220 {
 221         return mxs_phy->data == &imx7ulp_phy_data;
 222 }
 223 
 224 /*
 225  * PHY needs some 32K cycles to switch from 32K clock to
 226  * bus (such as AHB/AXI, etc) clock.
 227  */
 228 static void mxs_phy_clock_switch_delay(void)
 229 {
 230         usleep_range(300, 400);
 231 }
 232 
 233 static void mxs_phy_tx_init(struct mxs_phy *mxs_phy)
 234 {
 235         void __iomem *base = mxs_phy->phy.io_priv;
 236         u32 phytx;
 237 
 238         /* Update TX register if there is anything to write */
 239         if (mxs_phy->tx_reg_mask) {
 240                 phytx = readl(base + HW_USBPHY_TX);
 241                 phytx &= ~mxs_phy->tx_reg_mask;
 242                 phytx |= mxs_phy->tx_reg_set;
 243                 writel(phytx, base + HW_USBPHY_TX);
 244         }
 245 }
 246 
 247 static int mxs_phy_pll_enable(void __iomem *base, bool enable)
 248 {
 249         int ret = 0;
 250 
 251         if (enable) {
 252                 u32 value;
 253 
 254                 writel(BM_USBPHY_PLL_REG_ENABLE, base + HW_USBPHY_PLL_SIC_SET);
 255                 writel(BM_USBPHY_PLL_BYPASS, base + HW_USBPHY_PLL_SIC_CLR);
 256                 writel(BM_USBPHY_PLL_POWER, base + HW_USBPHY_PLL_SIC_SET);
 257                 ret = readl_poll_timeout(base + HW_USBPHY_PLL_SIC,
 258                         value, (value & BM_USBPHY_PLL_LOCK) != 0,
 259                         100, 10000);
 260                 if (ret)
 261                         return ret;
 262 
 263                 writel(BM_USBPHY_PLL_EN_USB_CLKS, base +
 264                                 HW_USBPHY_PLL_SIC_SET);
 265         } else {
 266                 writel(BM_USBPHY_PLL_EN_USB_CLKS, base +
 267                                 HW_USBPHY_PLL_SIC_CLR);
 268                 writel(BM_USBPHY_PLL_POWER, base + HW_USBPHY_PLL_SIC_CLR);
 269                 writel(BM_USBPHY_PLL_BYPASS, base + HW_USBPHY_PLL_SIC_SET);
 270                 writel(BM_USBPHY_PLL_REG_ENABLE, base + HW_USBPHY_PLL_SIC_CLR);
 271         }
 272 
 273         return ret;
 274 }
 275 
 276 static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
 277 {
 278         int ret;
 279         void __iomem *base = mxs_phy->phy.io_priv;
 280 
 281         if (is_imx7ulp_phy(mxs_phy)) {
 282                 ret = mxs_phy_pll_enable(base, true);
 283                 if (ret)
 284                         return ret;
 285         }
 286 
 287         ret = stmp_reset_block(base + HW_USBPHY_CTRL);
 288         if (ret)
 289                 goto disable_pll;
 290 
 291         /* Power up the PHY */
 292         writel(0, base + HW_USBPHY_PWD);
 293 
 294         /*
 295          * USB PHY Ctrl Setting
 296          * - Auto clock/power on
 297          * - Enable full/low speed support
 298          */
 299         writel(BM_USBPHY_CTRL_ENAUTOSET_USBCLKS |
 300                 BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE |
 301                 BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD |
 302                 BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE |
 303                 BM_USBPHY_CTRL_ENAUTO_PWRON_PLL |
 304                 BM_USBPHY_CTRL_ENUTMILEVEL2 |
 305                 BM_USBPHY_CTRL_ENUTMILEVEL3,
 306                base + HW_USBPHY_CTRL_SET);
 307 
 308         if (mxs_phy->data->flags & MXS_PHY_NEED_IP_FIX)
 309                 writel(BM_USBPHY_IP_FIX, base + HW_USBPHY_IP_SET);
 310 
 311         if (mxs_phy->regmap_anatop) {
 312                 unsigned int reg = mxs_phy->port_id ?
 313                         ANADIG_USB1_CHRG_DETECT_SET :
 314                         ANADIG_USB2_CHRG_DETECT_SET;
 315                 /*
 316                  * The external charger detector needs to be disabled,
 317                  * or the signal at DP will be poor
 318                  */
 319                 regmap_write(mxs_phy->regmap_anatop, reg,
 320                              ANADIG_USB1_CHRG_DETECT_EN_B |
 321                              ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
 322         }
 323 
 324         mxs_phy_tx_init(mxs_phy);
 325 
 326         return 0;
 327 
 328 disable_pll:
 329         if (is_imx7ulp_phy(mxs_phy))
 330                 mxs_phy_pll_enable(base, false);
 331         return ret;
 332 }
 333 
 334 /* Return true if the vbus is there */
 335 static bool mxs_phy_get_vbus_status(struct mxs_phy *mxs_phy)
 336 {
 337         unsigned int vbus_value = 0;
 338 
 339         if (!mxs_phy->regmap_anatop)
 340                 return false;
 341 
 342         if (mxs_phy->port_id == 0)
 343                 regmap_read(mxs_phy->regmap_anatop,
 344                         ANADIG_USB1_VBUS_DET_STAT,
 345                         &vbus_value);
 346         else if (mxs_phy->port_id == 1)
 347                 regmap_read(mxs_phy->regmap_anatop,
 348                         ANADIG_USB2_VBUS_DET_STAT,
 349                         &vbus_value);
 350 
 351         if (vbus_value & BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)
 352                 return true;
 353         else
 354                 return false;
 355 }
 356 
 357 static void __mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool disconnect)
 358 {
 359         void __iomem *base = mxs_phy->phy.io_priv;
 360         u32 reg;
 361 
 362         if (disconnect)
 363                 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
 364                         base + HW_USBPHY_DEBUG_CLR);
 365 
 366         if (mxs_phy->port_id == 0) {
 367                 reg = disconnect ? ANADIG_USB1_LOOPBACK_SET
 368                         : ANADIG_USB1_LOOPBACK_CLR;
 369                 regmap_write(mxs_phy->regmap_anatop, reg,
 370                         BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 |
 371                         BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN);
 372         } else if (mxs_phy->port_id == 1) {
 373                 reg = disconnect ? ANADIG_USB2_LOOPBACK_SET
 374                         : ANADIG_USB2_LOOPBACK_CLR;
 375                 regmap_write(mxs_phy->regmap_anatop, reg,
 376                         BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1 |
 377                         BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN);
 378         }
 379 
 380         if (!disconnect)
 381                 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
 382                         base + HW_USBPHY_DEBUG_SET);
 383 
 384         /* Delay some time, and let Linestate be SE0 for controller */
 385         if (disconnect)
 386                 usleep_range(500, 1000);
 387 }
 388 
 389 static bool mxs_phy_is_otg_host(struct mxs_phy *mxs_phy)
 390 {
 391         void __iomem *base = mxs_phy->phy.io_priv;
 392         u32 phyctrl = readl(base + HW_USBPHY_CTRL);
 393 
 394         if (IS_ENABLED(CONFIG_USB_OTG) &&
 395                         !(phyctrl & BM_USBPHY_CTRL_OTG_ID_VALUE))
 396                 return true;
 397 
 398         return false;
 399 }
 400 
 401 static void mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool on)
 402 {
 403         bool vbus_is_on = false;
 404 
 405         /* If the SoCs don't need to disconnect line without vbus, quit */
 406         if (!(mxs_phy->data->flags & MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS))
 407                 return;
 408 
 409         /* If the SoCs don't have anatop, quit */
 410         if (!mxs_phy->regmap_anatop)
 411                 return;
 412 
 413         vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);
 414 
 415         if (on && !vbus_is_on && !mxs_phy_is_otg_host(mxs_phy))
 416                 __mxs_phy_disconnect_line(mxs_phy, true);
 417         else
 418                 __mxs_phy_disconnect_line(mxs_phy, false);
 419 
 420 }
 421 
 422 static int mxs_phy_init(struct usb_phy *phy)
 423 {
 424         int ret;
 425         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
 426 
 427         mxs_phy_clock_switch_delay();
 428         ret = clk_prepare_enable(mxs_phy->clk);
 429         if (ret)
 430                 return ret;
 431 
 432         return mxs_phy_hw_init(mxs_phy);
 433 }
 434 
 435 static void mxs_phy_shutdown(struct usb_phy *phy)
 436 {
 437         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
 438         u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP |
 439                         BM_USBPHY_CTRL_ENDPDMCHG_WKUP |
 440                         BM_USBPHY_CTRL_ENIDCHG_WKUP |
 441                         BM_USBPHY_CTRL_ENAUTOSET_USBCLKS |
 442                         BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE |
 443                         BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD |
 444                         BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE |
 445                         BM_USBPHY_CTRL_ENAUTO_PWRON_PLL;
 446 
 447         writel(value, phy->io_priv + HW_USBPHY_CTRL_CLR);
 448         writel(0xffffffff, phy->io_priv + HW_USBPHY_PWD);
 449 
 450         writel(BM_USBPHY_CTRL_CLKGATE,
 451                phy->io_priv + HW_USBPHY_CTRL_SET);
 452 
 453         if (is_imx7ulp_phy(mxs_phy))
 454                 mxs_phy_pll_enable(phy->io_priv, false);
 455 
 456         clk_disable_unprepare(mxs_phy->clk);
 457 }
 458 
 459 static bool mxs_phy_is_low_speed_connection(struct mxs_phy *mxs_phy)
 460 {
 461         unsigned int line_state;
 462         /* bit definition is the same for all controllers */
 463         unsigned int dp_bit = BM_ANADIG_USB1_MISC_RX_VPIN_FS,
 464                      dm_bit = BM_ANADIG_USB1_MISC_RX_VMIN_FS;
 465         unsigned int reg = ANADIG_USB1_MISC;
 466 
 467         /* If the SoCs don't have anatop, quit */
 468         if (!mxs_phy->regmap_anatop)
 469                 return false;
 470 
 471         if (mxs_phy->port_id == 0)
 472                 reg = ANADIG_USB1_MISC;
 473         else if (mxs_phy->port_id == 1)
 474                 reg = ANADIG_USB2_MISC;
 475 
 476         regmap_read(mxs_phy->regmap_anatop, reg, &line_state);
 477 
 478         if ((line_state & (dp_bit | dm_bit)) ==  dm_bit)
 479                 return true;
 480         else
 481                 return false;
 482 }
 483 
 484 static int mxs_phy_suspend(struct usb_phy *x, int suspend)
 485 {
 486         int ret;
 487         struct mxs_phy *mxs_phy = to_mxs_phy(x);
 488         bool low_speed_connection, vbus_is_on;
 489 
 490         low_speed_connection = mxs_phy_is_low_speed_connection(mxs_phy);
 491         vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);
 492 
 493         if (suspend) {
 494                 /*
 495                  * FIXME: Do not power down RXPWD1PT1 bit for low speed
 496                  * connect. The low speed connection will have problem at
 497                  * very rare cases during usb suspend and resume process.
 498                  */
 499                 if (low_speed_connection & vbus_is_on) {
 500                         /*
 501                          * If value to be set as pwd value is not 0xffffffff,
 502                          * several 32Khz cycles are needed.
 503                          */
 504                         mxs_phy_clock_switch_delay();
 505                         writel(0xffbfffff, x->io_priv + HW_USBPHY_PWD);
 506                 } else {
 507                         writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
 508                 }
 509                 writel(BM_USBPHY_CTRL_CLKGATE,
 510                        x->io_priv + HW_USBPHY_CTRL_SET);
 511                 clk_disable_unprepare(mxs_phy->clk);
 512         } else {
 513                 mxs_phy_clock_switch_delay();
 514                 ret = clk_prepare_enable(mxs_phy->clk);
 515                 if (ret)
 516                         return ret;
 517                 writel(BM_USBPHY_CTRL_CLKGATE,
 518                        x->io_priv + HW_USBPHY_CTRL_CLR);
 519                 writel(0, x->io_priv + HW_USBPHY_PWD);
 520         }
 521 
 522         return 0;
 523 }
 524 
 525 static int mxs_phy_set_wakeup(struct usb_phy *x, bool enabled)
 526 {
 527         struct mxs_phy *mxs_phy = to_mxs_phy(x);
 528         u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP |
 529                         BM_USBPHY_CTRL_ENDPDMCHG_WKUP |
 530                                 BM_USBPHY_CTRL_ENIDCHG_WKUP;
 531         if (enabled) {
 532                 mxs_phy_disconnect_line(mxs_phy, true);
 533                 writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_SET);
 534         } else {
 535                 writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_CLR);
 536                 mxs_phy_disconnect_line(mxs_phy, false);
 537         }
 538 
 539         return 0;
 540 }
 541 
 542 static int mxs_phy_on_connect(struct usb_phy *phy,
 543                 enum usb_device_speed speed)
 544 {
 545         dev_dbg(phy->dev, "%s device has connected\n",
 546                 (speed == USB_SPEED_HIGH) ? "HS" : "FS/LS");
 547 
 548         if (speed == USB_SPEED_HIGH)
 549                 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
 550                        phy->io_priv + HW_USBPHY_CTRL_SET);
 551 
 552         return 0;
 553 }
 554 
 555 static int mxs_phy_on_disconnect(struct usb_phy *phy,
 556                 enum usb_device_speed speed)
 557 {
 558         dev_dbg(phy->dev, "%s device has disconnected\n",
 559                 (speed == USB_SPEED_HIGH) ? "HS" : "FS/LS");
 560 
 561         /* Sometimes, the speed is not high speed when the error occurs */
 562         if (readl(phy->io_priv + HW_USBPHY_CTRL) &
 563                         BM_USBPHY_CTRL_ENHOSTDISCONDETECT)
 564                 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
 565                        phy->io_priv + HW_USBPHY_CTRL_CLR);
 566 
 567         return 0;
 568 }
 569 
 570 #define MXS_USB_CHARGER_DATA_CONTACT_TIMEOUT    100
 571 static int mxs_charger_data_contact_detect(struct mxs_phy *x)
 572 {
 573         struct regmap *regmap = x->regmap_anatop;
 574         int i, stable_contact_count = 0;
 575         u32 val;
 576 
 577         /* Check if vbus is valid */
 578         regmap_read(regmap, ANADIG_USB1_VBUS_DET_STAT, &val);
 579         if (!(val & ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)) {
 580                 dev_err(x->phy.dev, "vbus is not valid\n");
 581                 return -EINVAL;
 582         }
 583 
 584         /* Enable charger detector */
 585         regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_CLR,
 586                                 ANADIG_USB1_CHRG_DETECT_EN_B);
 587         /*
 588          * - Do not check whether a charger is connected to the USB port
 589          * - Check whether the USB plug has been in contact with each other
 590          */
 591         regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET,
 592                         ANADIG_USB1_CHRG_DETECT_CHK_CONTACT |
 593                         ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
 594 
 595         /* Check if plug is connected */
 596         for (i = 0; i < MXS_USB_CHARGER_DATA_CONTACT_TIMEOUT; i++) {
 597                 regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val);
 598                 if (val & ANADIG_USB1_CHRG_DET_STAT_PLUG_CONTACT) {
 599                         stable_contact_count++;
 600                         if (stable_contact_count > 5)
 601                                 /* Data pin makes contact */
 602                                 break;
 603                         else
 604                                 usleep_range(5000, 10000);
 605                 } else {
 606                         stable_contact_count = 0;
 607                         usleep_range(5000, 6000);
 608                 }
 609         }
 610 
 611         if (i == MXS_USB_CHARGER_DATA_CONTACT_TIMEOUT) {
 612                 dev_err(x->phy.dev,
 613                         "Data pin can't make good contact.\n");
 614                 /* Disable charger detector */
 615                 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET,
 616                                 ANADIG_USB1_CHRG_DETECT_EN_B |
 617                                 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
 618                 return -ENXIO;
 619         }
 620 
 621         return 0;
 622 }
 623 
 624 static enum usb_charger_type mxs_charger_primary_detection(struct mxs_phy *x)
 625 {
 626         struct regmap *regmap = x->regmap_anatop;
 627         enum usb_charger_type chgr_type = UNKNOWN_TYPE;
 628         u32 val;
 629 
 630         /*
 631          * - Do check whether a charger is connected to the USB port
 632          * - Do not Check whether the USB plug has been in contact with
 633          *   each other
 634          */
 635         regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_CLR,
 636                         ANADIG_USB1_CHRG_DETECT_CHK_CONTACT |
 637                         ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
 638 
 639         msleep(100);
 640 
 641         /* Check if it is a charger */
 642         regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val);
 643         if (!(val & ANADIG_USB1_CHRG_DET_STAT_CHRG_DETECTED)) {
 644                 chgr_type = SDP_TYPE;
 645                 dev_dbg(x->phy.dev, "It is a standard downstream port\n");
 646         }
 647 
 648         /* Disable charger detector */
 649         regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET,
 650                         ANADIG_USB1_CHRG_DETECT_EN_B |
 651                         ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
 652 
 653         return chgr_type;
 654 }
 655 
 656 /*
 657  * It must be called after DP is pulled up, which is used to
 658  * differentiate DCP and CDP.
 659  */
 660 static enum usb_charger_type mxs_charger_secondary_detection(struct mxs_phy *x)
 661 {
 662         struct regmap *regmap = x->regmap_anatop;
 663         int val;
 664 
 665         msleep(80);
 666 
 667         regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val);
 668         if (val & ANADIG_USB1_CHRG_DET_STAT_DM_STATE) {
 669                 dev_dbg(x->phy.dev, "It is a dedicate charging port\n");
 670                 return DCP_TYPE;
 671         } else {
 672                 dev_dbg(x->phy.dev, "It is a charging downstream port\n");
 673                 return CDP_TYPE;
 674         }
 675 }
 676 
 677 static enum usb_charger_type mxs_phy_charger_detect(struct usb_phy *phy)
 678 {
 679         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
 680         struct regmap *regmap = mxs_phy->regmap_anatop;
 681         void __iomem *base = phy->io_priv;
 682         enum usb_charger_type chgr_type = UNKNOWN_TYPE;
 683 
 684         if (!regmap)
 685                 return UNKNOWN_TYPE;
 686 
 687         if (mxs_charger_data_contact_detect(mxs_phy))
 688                 return chgr_type;
 689 
 690         chgr_type = mxs_charger_primary_detection(mxs_phy);
 691 
 692         if (chgr_type != SDP_TYPE) {
 693                 /* Pull up DP via test */
 694                 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
 695                                 base + HW_USBPHY_DEBUG_CLR);
 696                 regmap_write(regmap, ANADIG_USB1_LOOPBACK_SET,
 697                                 ANADIG_USB1_LOOPBACK_UTMI_TESTSTART);
 698 
 699                 chgr_type = mxs_charger_secondary_detection(mxs_phy);
 700 
 701                 /* Stop the test */
 702                 regmap_write(regmap, ANADIG_USB1_LOOPBACK_CLR,
 703                                 ANADIG_USB1_LOOPBACK_UTMI_TESTSTART);
 704                 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
 705                                 base + HW_USBPHY_DEBUG_SET);
 706         }
 707 
 708         return chgr_type;
 709 }
 710 
 711 static int mxs_phy_probe(struct platform_device *pdev)
 712 {
 713         struct resource *res;
 714         void __iomem *base;
 715         struct clk *clk;
 716         struct mxs_phy *mxs_phy;
 717         int ret;
 718         const struct of_device_id *of_id;
 719         struct device_node *np = pdev->dev.of_node;
 720         u32 val;
 721 
 722         of_id = of_match_device(mxs_phy_dt_ids, &pdev->dev);
 723         if (!of_id)
 724                 return -ENODEV;
 725 
 726         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 727         base = devm_ioremap_resource(&pdev->dev, res);
 728         if (IS_ERR(base))
 729                 return PTR_ERR(base);
 730 
 731         clk = devm_clk_get(&pdev->dev, NULL);
 732         if (IS_ERR(clk)) {
 733                 dev_err(&pdev->dev,
 734                         "can't get the clock, err=%ld", PTR_ERR(clk));
 735                 return PTR_ERR(clk);
 736         }
 737 
 738         mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
 739         if (!mxs_phy)
 740                 return -ENOMEM;
 741 
 742         /* Some SoCs don't have anatop registers */
 743         if (of_get_property(np, "fsl,anatop", NULL)) {
 744                 mxs_phy->regmap_anatop = syscon_regmap_lookup_by_phandle
 745                         (np, "fsl,anatop");
 746                 if (IS_ERR(mxs_phy->regmap_anatop)) {
 747                         dev_dbg(&pdev->dev,
 748                                 "failed to find regmap for anatop\n");
 749                         return PTR_ERR(mxs_phy->regmap_anatop);
 750                 }
 751         }
 752 
 753         /* Precompute which bits of the TX register are to be updated, if any */
 754         if (!of_property_read_u32(np, "fsl,tx-cal-45-dn-ohms", &val) &&
 755             val >= MXS_PHY_TX_CAL45_MIN && val <= MXS_PHY_TX_CAL45_MAX) {
 756                 /* Scale to a 4-bit value */
 757                 val = (MXS_PHY_TX_CAL45_MAX - val) * 0xF
 758                         / (MXS_PHY_TX_CAL45_MAX - MXS_PHY_TX_CAL45_MIN);
 759                 mxs_phy->tx_reg_mask |= GM_USBPHY_TX_TXCAL45DN(~0);
 760                 mxs_phy->tx_reg_set  |= GM_USBPHY_TX_TXCAL45DN(val);
 761         }
 762 
 763         if (!of_property_read_u32(np, "fsl,tx-cal-45-dp-ohms", &val) &&
 764             val >= MXS_PHY_TX_CAL45_MIN && val <= MXS_PHY_TX_CAL45_MAX) {
 765                 /* Scale to a 4-bit value. */
 766                 val = (MXS_PHY_TX_CAL45_MAX - val) * 0xF
 767                         / (MXS_PHY_TX_CAL45_MAX - MXS_PHY_TX_CAL45_MIN);
 768                 mxs_phy->tx_reg_mask |= GM_USBPHY_TX_TXCAL45DP(~0);
 769                 mxs_phy->tx_reg_set  |= GM_USBPHY_TX_TXCAL45DP(val);
 770         }
 771 
 772         if (!of_property_read_u32(np, "fsl,tx-d-cal", &val) &&
 773             val >= MXS_PHY_TX_D_CAL_MIN && val <= MXS_PHY_TX_D_CAL_MAX) {
 774                 /* Scale to a 4-bit value.  Round up the values and heavily
 775                  * weight the rounding by adding 2/3 of the denominator.
 776                  */
 777                 val = ((MXS_PHY_TX_D_CAL_MAX - val) * 0xF
 778                         + (MXS_PHY_TX_D_CAL_MAX - MXS_PHY_TX_D_CAL_MIN) * 2/3)
 779                         / (MXS_PHY_TX_D_CAL_MAX - MXS_PHY_TX_D_CAL_MIN);
 780                 mxs_phy->tx_reg_mask |= GM_USBPHY_TX_D_CAL(~0);
 781                 mxs_phy->tx_reg_set  |= GM_USBPHY_TX_D_CAL(val);
 782         }
 783 
 784         ret = of_alias_get_id(np, "usbphy");
 785         if (ret < 0)
 786                 dev_dbg(&pdev->dev, "failed to get alias id, errno %d\n", ret);
 787         mxs_phy->port_id = ret;
 788 
 789         mxs_phy->phy.io_priv            = base;
 790         mxs_phy->phy.dev                = &pdev->dev;
 791         mxs_phy->phy.label              = DRIVER_NAME;
 792         mxs_phy->phy.init               = mxs_phy_init;
 793         mxs_phy->phy.shutdown           = mxs_phy_shutdown;
 794         mxs_phy->phy.set_suspend        = mxs_phy_suspend;
 795         mxs_phy->phy.notify_connect     = mxs_phy_on_connect;
 796         mxs_phy->phy.notify_disconnect  = mxs_phy_on_disconnect;
 797         mxs_phy->phy.type               = USB_PHY_TYPE_USB2;
 798         mxs_phy->phy.set_wakeup         = mxs_phy_set_wakeup;
 799         mxs_phy->phy.charger_detect     = mxs_phy_charger_detect;
 800 
 801         mxs_phy->clk = clk;
 802         mxs_phy->data = of_id->data;
 803 
 804         platform_set_drvdata(pdev, mxs_phy);
 805 
 806         device_set_wakeup_capable(&pdev->dev, true);
 807 
 808         return usb_add_phy_dev(&mxs_phy->phy);
 809 }
 810 
 811 static int mxs_phy_remove(struct platform_device *pdev)
 812 {
 813         struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);
 814 
 815         usb_remove_phy(&mxs_phy->phy);
 816 
 817         return 0;
 818 }
 819 
 820 #ifdef CONFIG_PM_SLEEP
 821 static void mxs_phy_enable_ldo_in_suspend(struct mxs_phy *mxs_phy, bool on)
 822 {
 823         unsigned int reg = on ? ANADIG_ANA_MISC0_SET : ANADIG_ANA_MISC0_CLR;
 824 
 825         /* If the SoCs don't have anatop, quit */
 826         if (!mxs_phy->regmap_anatop)
 827                 return;
 828 
 829         if (is_imx6q_phy(mxs_phy))
 830                 regmap_write(mxs_phy->regmap_anatop, reg,
 831                         BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG);
 832         else if (is_imx6sl_phy(mxs_phy))
 833                 regmap_write(mxs_phy->regmap_anatop,
 834                         reg, BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL);
 835 }
 836 
 837 static int mxs_phy_system_suspend(struct device *dev)
 838 {
 839         struct mxs_phy *mxs_phy = dev_get_drvdata(dev);
 840 
 841         if (device_may_wakeup(dev))
 842                 mxs_phy_enable_ldo_in_suspend(mxs_phy, true);
 843 
 844         return 0;
 845 }
 846 
 847 static int mxs_phy_system_resume(struct device *dev)
 848 {
 849         struct mxs_phy *mxs_phy = dev_get_drvdata(dev);
 850 
 851         if (device_may_wakeup(dev))
 852                 mxs_phy_enable_ldo_in_suspend(mxs_phy, false);
 853 
 854         return 0;
 855 }
 856 #endif /* CONFIG_PM_SLEEP */
 857 
 858 static SIMPLE_DEV_PM_OPS(mxs_phy_pm, mxs_phy_system_suspend,
 859                 mxs_phy_system_resume);
 860 
 861 static struct platform_driver mxs_phy_driver = {
 862         .probe = mxs_phy_probe,
 863         .remove = mxs_phy_remove,
 864         .driver = {
 865                 .name = DRIVER_NAME,
 866                 .of_match_table = mxs_phy_dt_ids,
 867                 .pm = &mxs_phy_pm,
 868          },
 869 };
 870 
 871 static int __init mxs_phy_module_init(void)
 872 {
 873         return platform_driver_register(&mxs_phy_driver);
 874 }
 875 postcore_initcall(mxs_phy_module_init);
 876 
 877 static void __exit mxs_phy_module_exit(void)
 878 {
 879         platform_driver_unregister(&mxs_phy_driver);
 880 }
 881 module_exit(mxs_phy_module_exit);
 882 
 883 MODULE_ALIAS("platform:mxs-usb-phy");
 884 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 885 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
 886 MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
 887 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/usb/phy/phy-mxs-usb.c

DEFINITIONS
