arch/arm/cpu/arm926ejs/mxs/spl_power_init.c

   1 /*
   2  * Freescale i.MX28 Boot PMIC init
   3  *
   4  * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
   5  * on behalf of DENX Software Engineering GmbH
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <config.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/imx-regs.h>
  14
  15 #include "mxs_init.h"
  16
  17 #ifdef CONFIG_SYS_MXS_VDD5V_ONLY
  18 #define DCDC4P2_DROPOUT_CONFIG  POWER_DCDC4P2_DROPOUT_CTRL_100MV | \
  19                                 POWER_DCDC4P2_DROPOUT_CTRL_SRC_4P2
  20 #else
  21 #define DCDC4P2_DROPOUT_CONFIG  POWER_DCDC4P2_DROPOUT_CTRL_100MV | \
  22                                 POWER_DCDC4P2_DROPOUT_CTRL_SRC_SEL
  23 #endif
  24 #ifdef CONFIG_SYS_SPL_VDDD_VAL
  25 #define VDDD_VAL        CONFIG_SYS_SPL_VDDD_VAL
  26 #else
  27 #define VDDD_VAL        1350
  28 #endif
  29 #ifdef CONFIG_SYS_SPL_VDDIO_VAL
  30 #define VDDIO_VAL       CONFIG_SYS_SPL_VDDIO_VAL
  31 #else
  32 #define VDDIO_VAL       3300
  33 #endif
  34 #ifdef CONFIG_SYS_SPL_VDDA_VAL
  35 #define VDDA_VAL        CONFIG_SYS_SPL_VDDA_VAL
  36 #else
  37 #define VDDA_VAL        1800
  38 #endif
  39 #ifdef CONFIG_SYS_SPL_VDDMEM_VAL
  40 #define VDDMEM_VAL      CONFIG_SYS_SPL_VDDMEM_VAL
  41 #else
  42 #define VDDMEM_VAL      1700
  43 #endif
  44
  45 #ifdef CONFIG_SYS_SPL_VDDD_BO_VAL
  46 #define VDDD_BO_VAL     CONFIG_SYS_SPL_VDDD_BO_VAL
  47 #else
  48 #define VDDD_BO_VAL     150
  49 #endif
  50 #ifdef CONFIG_SYS_SPL_VDDIO_BO_VAL
  51 #define VDDIO_BO_VAL    CONFIG_SYS_SPL_VDDIO_BO_VAL
  52 #else
  53 #define VDDIO_BO_VAL    150
  54 #endif
  55 #ifdef CONFIG_SYS_SPL_VDDA_BO_VAL
  56 #define VDDA_BO_VAL     CONFIG_SYS_SPL_VDDA_BO_VAL
  57 #else
  58 #define VDDA_BO_VAL     175
  59 #endif
  60 #ifdef CONFIG_SYS_SPL_VDDMEM_BO_VAL
  61 #define VDDMEM_BO_VAL   CONFIG_SYS_SPL_VDDMEM_BO_VAL
  62 #else
  63 #define VDDMEM_BO_VAL   25
  64 #endif
  65
  66 #ifdef CONFIG_SYS_SPL_BATT_BO_LEVEL
  67 #if CONFIG_SYS_SPL_BATT_BO_LEVEL < 2400 || CONFIG_SYS_SPL_BATT_BO_LEVEL > 3640
  68 #error CONFIG_SYS_SPL_BATT_BO_LEVEL out of range
  69 #endif
  70 #define BATT_BO_VAL     (((CONFIG_SYS_SPL_BATT_BO_LEVEL) - 2400) / 40)
  71 #else
  72 /* Brownout default at 3V */
  73 #define BATT_BO_VAL     ((3000 - 2400) / 40)
  74 #endif
  75
  76 #ifdef CONFIG_SYS_SPL_FIXED_BATT_SUPPLY
  77 static const int fixed_batt_supply = 1;
  78 #else
  79 static const int fixed_batt_supply;
  80 #endif
  81
  82 static struct mxs_power_regs *power_regs = (void *)MXS_POWER_BASE;
  83
  84 /**
  85  * mxs_power_clock2xtal() - Switch CPU core clock source to 24MHz XTAL
  86  *
  87  * This function switches the CPU core clock from PLL to 24MHz XTAL
  88  * oscilator. This is necessary if the PLL is being reconfigured to
  89  * prevent crash of the CPU core.
  90  */
  91 static void mxs_power_clock2xtal(void)
  92 {
  93         struct mxs_clkctrl_regs *clkctrl_regs =
  94                 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
  95
  96         debug("SPL: Switching CPU clock to 24MHz XTAL\n");
  97
  98         /* Set XTAL as CPU reference clock */
  99         writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
 100                 &clkctrl_regs->hw_clkctrl_clkseq_set);
 101 }
 102
 103 /**
 104  * mxs_power_clock2pll() - Switch CPU core clock source to PLL
 105  *
 106  * This function switches the CPU core clock from 24MHz XTAL oscilator
 107  * to PLL. This can only be called once the PLL has re-locked and once
 108  * the PLL is stable after reconfiguration.
 109  */
 110 static void mxs_power_clock2pll(void)
 111 {
 112         struct mxs_clkctrl_regs *clkctrl_regs =
 113                 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
 114
 115         debug("SPL: Switching CPU core clock source to PLL\n");
 116
 117         writel(CLKCTRL_PLL0CTRL0_POWER,
 118                 &clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
 119         /*
 120          * The PLL is documented to lock within 10 µs from setting
 121          * the POWER bit.
 122          */
 123         udelay(15);
 124
 125         /*
 126          * TODO: Should the PLL0 FORCE_LOCK bit be set here followed by a
 127          * wait on the PLL0 LOCK bit?
 128          */
 129         writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
 130                 &clkctrl_regs->hw_clkctrl_clkseq_clr);
 131 }
 132
 133 static int mxs_power_wait_rtc_stat(u32 mask)
 134 {
 135         int timeout = 5000; /* 3 ms according to i.MX28 Ref. Manual */
 136         u32 val;
 137         struct mxs_rtc_regs *rtc_regs = (void *)MXS_RTC_BASE;
 138
 139         while ((val = readl(&rtc_regs->hw_rtc_stat)) & mask) {
 140                 udelay(1);
 141                 if (timeout-- < 0)
 142                         break;
 143         }
 144         return !!(readl(&rtc_regs->hw_rtc_stat) & mask);
 145 }
 146
 147 /**
 148  * mxs_power_set_auto_restart() - Set the auto-restart bit
 149  *
 150  * This function ungates the RTC block and sets the AUTO_RESTART
 151  * bit to work around a design bug on MX28EVK Rev. A .
 152  */
 153 static int mxs_power_set_auto_restart(int on)
 154 {
 155         struct mxs_rtc_regs *rtc_regs = (void *)MXS_RTC_BASE;
 156
 157         debug("SPL: Setting auto-restart bit\n");
 158
 159         if (mxs_power_wait_rtc_stat(RTC_STAT_STALE_REGS_PERSISTENT0))
 160                 return 1;
 161
 162         /* Do nothing if flag already set */
 163         if (readl(&rtc_regs->hw_rtc_persistent0) & RTC_PERSISTENT0_AUTO_RESTART)
 164                 return 0;
 165
 166         if ((!(readl(&rtc_regs->hw_rtc_persistent0) &
 167                                 RTC_PERSISTENT0_AUTO_RESTART) ^ !on) == 0)
 168                 return 0;
 169
 170         if (mxs_power_wait_rtc_stat(RTC_STAT_NEW_REGS_PERSISTENT0))
 171                 return 1;
 172
 173         clrsetbits_le32(&rtc_regs->hw_rtc_persistent0,
 174                         !on * RTC_PERSISTENT0_AUTO_RESTART,
 175                         !!on * RTC_PERSISTENT0_AUTO_RESTART);
 176         if (mxs_power_wait_rtc_stat(RTC_STAT_NEW_REGS_PERSISTENT0))
 177                 return 1;
 178
 179         return 0;
 180 }
 181
 182 /**
 183  * mxs_power_set_linreg() - Set linear regulators 25mV below DC-DC converter
 184  *
 185  * This function configures the VDDIO, VDDA and VDDD linear regulators output
 186  * to be 25mV below the VDDIO, VDDA and VDDD output from the DC-DC switching
 187  * converter. This is the recommended setting for the case where we use both
 188  * linear regulators and DC-DC converter to power the VDDIO rail.
 189  */
 190 static void mxs_power_set_linreg(void)
 191 {
 192         /* Set linear regulator 25mV below switching converter */
 193         debug("SPL: Setting VDDD 25mV below DC-DC converters\n");
 194         clrsetbits_le32(&power_regs->hw_power_vdddctrl,
 195                         POWER_VDDDCTRL_LINREG_OFFSET_MASK,
 196                         POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW);
 197
 198         debug("SPL: Setting VDDA 25mV below DC-DC converters\n");
 199         clrsetbits_le32(&power_regs->hw_power_vddactrl,
 200                         POWER_VDDACTRL_LINREG_OFFSET_MASK,
 201                         POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW);
 202
 203         debug("SPL: Setting VDDIO 25mV below DC-DC converters\n");
 204         clrsetbits_le32(&power_regs->hw_power_vddioctrl,
 205                         POWER_VDDIOCTRL_LINREG_OFFSET_MASK,
 206                         POWER_VDDIOCTRL_LINREG_OFFSET_1STEPS_BELOW);
 207 }
 208
 209 /**
 210  * mxs_get_batt_volt() - Measure battery input voltage
 211  *
 212  * This function retrieves the battery input voltage and returns it.
 213  */
 214 static int mxs_get_batt_volt(void)
 215 {
 216         uint32_t volt = readl(&power_regs->hw_power_battmonitor);
 217
 218         volt &= POWER_BATTMONITOR_BATT_VAL_MASK;
 219         volt >>= POWER_BATTMONITOR_BATT_VAL_OFFSET;
 220         volt *= 8;
 221
 222         debug("SPL: Battery Voltage = %dmV\n", volt);
 223         return volt;
 224 }
 225
 226 /**
 227  * mxs_is_batt_ready() - Test if the battery provides enough voltage to boot
 228  *
 229  * This function checks if the battery input voltage is higher than 3.6V and
 230  * therefore allows the system to successfully boot using this power source.
 231  */
 232 static int mxs_is_batt_ready(void)
 233 {
 234         return (mxs_get_batt_volt() >= 3600);
 235 }
 236
 237 /**
 238  * mxs_is_batt_good() - Test if battery is operational at all
 239  *
 240  * This function starts recharging the battery and tests if the input current
 241  * provided by the 5V input recharging the battery is also sufficient to power
 242  * the DC-DC converter.
 243  */
 244 static int mxs_is_batt_good(void)
 245 {
 246         uint32_t volt = mxs_get_batt_volt();
 247
 248         if ((volt >= 2400) && (volt <= 4300)) {
 249                 debug("SPL: Battery is good\n");
 250                 return 1;
 251         }
 252
 253         clrsetbits_le32(&power_regs->hw_power_5vctrl,
 254                 POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
 255                 0x3 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
 256         writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
 257                 &power_regs->hw_power_5vctrl_clr);
 258
 259         clrsetbits_le32(&power_regs->hw_power_charge,
 260                 POWER_CHARGE_STOP_ILIMIT_MASK | POWER_CHARGE_BATTCHRG_I_MASK,
 261                 POWER_CHARGE_STOP_ILIMIT_10MA | 0x3);
 262
 263         writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_clr);
 264         writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
 265                 &power_regs->hw_power_5vctrl_clr);
 266
 267         udelay(500000);
 268
 269         volt = mxs_get_batt_volt();
 270
 271         if (volt >= 3500) {
 272                 debug("SPL: Battery Voltage too high\n");
 273                 return 0;
 274         }
 275
 276         if (volt >= 2400) {
 277                 debug("SPL: Battery is good\n");
 278                 return 1;
 279         }
 280
 281         writel(POWER_CHARGE_STOP_ILIMIT_MASK | POWER_CHARGE_BATTCHRG_I_MASK,
 282                 &power_regs->hw_power_charge_clr);
 283         writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_set);
 284
 285         if (volt >= 3500) {
 286                 return 0;
 287         }
 288         if (volt >= 2400) {
 289                 return 1;
 290         }
 291         debug("SPL: Battery Voltage too low\n");
 292         return 0;
 293 }
 294
 295 /**
 296  * mxs_power_setup_5v_detect() - Start the 5V input detection comparator
 297  *
 298  * This function enables the 5V detection comparator and sets the 5V valid
 299  * threshold to 4.4V . We use 4.4V threshold here to make sure that even
 300  * under high load, the voltage drop on the 5V input won't be so critical
 301  * to cause undervolt on the 4P2 linear regulator supplying the DC-DC
 302  * converter and thus making the system crash.
 303  */
 304 static void mxs_power_setup_5v_detect(void)
 305 {
 306         /* Start 5V detection */
 307         debug("SPL: Starting 5V input detection comparator\n");
 308         clrsetbits_le32(&power_regs->hw_power_5vctrl,
 309                         POWER_5VCTRL_VBUSVALID_TRSH_MASK,
 310                         POWER_5VCTRL_VBUSVALID_TRSH_4V4 |
 311                         POWER_5VCTRL_PWRUP_VBUS_CMPS);
 312 }
 313
 314 /**
 315  * mxs_src_power_init() - Preconfigure the power block
 316  *
 317  * This function configures reasonable values for the DC-DC control loop
 318  * and battery monitor.
 319  */
 320 static void mxs_src_power_init(void)
 321 {
 322         debug("SPL: Pre-Configuring power block\n");
 323
 324         /* Improve efficieny and reduce transient ripple */
 325         writel(POWER_LOOPCTRL_TOGGLE_DIF | POWER_LOOPCTRL_EN_CM_HYST |
 326                 POWER_LOOPCTRL_EN_DF_HYST, &power_regs->hw_power_loopctrl_set);
 327
 328         clrsetbits_le32(&power_regs->hw_power_dclimits,
 329                         POWER_DCLIMITS_POSLIMIT_BUCK_MASK,
 330                         0x30 << POWER_DCLIMITS_POSLIMIT_BUCK_OFFSET);
 331
 332         if (!fixed_batt_supply) {
 333                 /* FIXME: This requires the LRADC to be set up! */
 334                 setbits_le32(&power_regs->hw_power_battmonitor,
 335                         POWER_BATTMONITOR_EN_BATADJ);
 336         } else {
 337                 clrbits_le32(&power_regs->hw_power_battmonitor,
 338                         POWER_BATTMONITOR_EN_BATADJ);
 339         }
 340
 341         /* Increase the RCSCALE level for quick DCDC response to dynamic load */
 342         clrsetbits_le32(&power_regs->hw_power_loopctrl,
 343                         POWER_LOOPCTRL_EN_RCSCALE_MASK,
 344                         POWER_LOOPCTRL_RCSCALE_THRESH |
 345                         POWER_LOOPCTRL_EN_RCSCALE_8X);
 346
 347         clrsetbits_le32(&power_regs->hw_power_minpwr,
 348                         POWER_MINPWR_HALFFETS, POWER_MINPWR_DOUBLE_FETS);
 349
 350         if (!fixed_batt_supply) {
 351                 /* 5V to battery handoff ... FIXME */
 352                 writel(POWER_5VCTRL_DCDC_XFER,
 353                         &power_regs->hw_power_5vctrl_set);
 354                 udelay(30);
 355                 writel(POWER_5VCTRL_DCDC_XFER,
 356                         &power_regs->hw_power_5vctrl_clr);
 357         }
 358 }
 359
 360 /**
 361  * mxs_power_init_4p2_params() - Configure the parameters of the 4P2 regulator
 362  *
 363  * This function configures the necessary parameters for the 4P2 linear
 364  * regulator to supply the DC-DC converter from 5V input.
 365  */
 366 static void mxs_power_init_4p2_params(void)
 367 {
 368         debug("SPL: Configuring common 4P2 regulator params\n");
 369
 370         /* Setup 4P2 parameters */
 371         clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
 372                 POWER_DCDC4P2_CMPTRIP_MASK | POWER_DCDC4P2_TRG_MASK,
 373                 POWER_DCDC4P2_TRG_4V2 | (31 << POWER_DCDC4P2_CMPTRIP_OFFSET));
 374
 375         clrsetbits_le32(&power_regs->hw_power_5vctrl,
 376                 POWER_5VCTRL_HEADROOM_ADJ_MASK,
 377                 0x4 << POWER_5VCTRL_HEADROOM_ADJ_OFFSET);
 378
 379         clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
 380                 POWER_DCDC4P2_DROPOUT_CTRL_MASK,
 381                 DCDC4P2_DROPOUT_CONFIG);
 382
 383         clrsetbits_le32(&power_regs->hw_power_5vctrl,
 384                 POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
 385                 0x3f << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
 386 }
 387
 388 /**
 389  * mxs_enable_4p2_dcdc_input() - Enable or disable the DCDC input from 4P2
 390  * @xfer:       Select if the input shall be enabled or disabled
 391  *
 392  * This function enables or disables the 4P2 input into the DC-DC converter.
 393  */
 394 static void mxs_enable_4p2_dcdc_input(int xfer)
 395 {
 396         uint32_t tmp, vbus_thresh, vbus_5vdetect, pwd_bo;
 397         uint32_t prev_5v_brnout, prev_5v_droop;
 398
 399         debug("SPL: %s 4P2 DC-DC Input\n", xfer ? "Enabling" : "Disabling");
 400
 401         if (xfer && (readl(&power_regs->hw_power_5vctrl) &
 402                         POWER_5VCTRL_ENABLE_DCDC)) {
 403                 return;
 404         }
 405
 406         prev_5v_brnout = readl(&power_regs->hw_power_5vctrl) &
 407                                 POWER_5VCTRL_PWDN_5VBRNOUT;
 408         prev_5v_droop = readl(&power_regs->hw_power_ctrl) &
 409                                 POWER_CTRL_ENIRQ_VDD5V_DROOP;
 410
 411         writel(POWER_5VCTRL_PWDN_5VBRNOUT, &power_regs->hw_power_5vctrl_clr);
 412         writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
 413                 &power_regs->hw_power_reset);
 414
 415         writel(POWER_CTRL_ENIRQ_VDD5V_DROOP, &power_regs->hw_power_ctrl_clr);
 416
 417         /*
 418          * Recording orignal values that will be modified temporarlily
 419          * to handle a chip bug. See chip errata for CQ ENGR00115837
 420          */
 421         tmp = readl(&power_regs->hw_power_5vctrl);
 422         vbus_thresh = tmp & POWER_5VCTRL_VBUSVALID_TRSH_MASK;
 423         vbus_5vdetect = tmp & POWER_5VCTRL_VBUSVALID_5VDETECT;
 424
 425         pwd_bo = readl(&power_regs->hw_power_minpwr) & POWER_MINPWR_PWD_BO;
 426
 427         /*
 428          * Disable mechanisms that get erroneously tripped by when setting
 429          * the DCDC4P2 EN_DCDC
 430          */
 431         writel(POWER_5VCTRL_VBUSVALID_5VDETECT |
 432                 POWER_5VCTRL_VBUSVALID_TRSH_MASK,
 433                 &power_regs->hw_power_5vctrl);
 434
 435         writel(POWER_MINPWR_PWD_BO, &power_regs->hw_power_minpwr_set);
 436
 437         if (xfer) {
 438                 writel(POWER_5VCTRL_DCDC_XFER,
 439                         &power_regs->hw_power_5vctrl);
 440                 udelay(20);
 441                 writel(POWER_5VCTRL_DCDC_XFER,
 442                         &power_regs->hw_power_5vctrl_clr);
 443
 444                 writel(POWER_5VCTRL_ENABLE_DCDC,
 445                         &power_regs->hw_power_5vctrl_set);
 446         } else {
 447                 writel(POWER_DCDC4P2_ENABLE_DCDC,
 448                         &power_regs->hw_power_dcdc4p2);
 449         }
 450
 451         udelay(25);
 452
 453         clrsetbits_le32(&power_regs->hw_power_5vctrl,
 454                         POWER_5VCTRL_VBUSVALID_TRSH_MASK, vbus_thresh);
 455
 456         if (vbus_5vdetect)
 457                 writel(vbus_5vdetect, &power_regs->hw_power_5vctrl_set);
 458
 459         if (!pwd_bo)
 460                 writel(POWER_MINPWR_PWD_BO, &power_regs->hw_power_minpwr_clr);
 461
 462         while (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ)
 463                 writel(POWER_CTRL_VBUS_VALID_IRQ,
 464                         &power_regs->hw_power_ctrl_clr);
 465
 466         if (prev_5v_brnout) {
 467                 writel(POWER_5VCTRL_PWDN_5VBRNOUT,
 468                         &power_regs->hw_power_5vctrl_set);
 469                 writel(POWER_RESET_UNLOCK_KEY,
 470                         &power_regs->hw_power_reset);
 471         } else {
 472                 writel(POWER_5VCTRL_PWDN_5VBRNOUT,
 473                         &power_regs->hw_power_5vctrl_clr);
 474                 writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
 475                         &power_regs->hw_power_reset);
 476         }
 477
 478         while (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VDD5V_DROOP_IRQ)
 479                 writel(POWER_CTRL_VDD5V_DROOP_IRQ,
 480                         &power_regs->hw_power_ctrl_clr);
 481
 482         if (prev_5v_droop)
 483                 writel(POWER_CTRL_ENIRQ_VDD5V_DROOP,
 484                         &power_regs->hw_power_ctrl_set);
 485         else
 486                 writel(POWER_CTRL_ENIRQ_VDD5V_DROOP,
 487                         &power_regs->hw_power_ctrl_clr);
 488 }
 489
 490 /**
 491  * mxs_power_init_4p2_regulator() - Start the 4P2 regulator
 492  *
 493  * This function enables the 4P2 regulator and switches the DC-DC converter
 494  * to use the 4P2 input.
 495  */
 496 static void mxs_power_init_4p2_regulator(void)
 497 {
 498         uint32_t tmp, tmp2;
 499
 500         debug("SPL: Enabling 4P2 regulator\n");
 501
 502         setbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_ENABLE_4P2);
 503
 504         writel(POWER_CHARGE_ENABLE_LOAD, &power_regs->hw_power_charge_set);
 505
 506         writel(POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
 507                 &power_regs->hw_power_5vctrl_clr);
 508         clrbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_TRG_MASK);
 509
 510         /* Power up the 4p2 rail and logic/control */
 511         writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
 512                 &power_regs->hw_power_5vctrl_clr);
 513
 514         /*
 515          * Start charging up the 4p2 capacitor. We ramp of this charge
 516          * gradually to avoid large inrush current from the 5V cable which can
 517          * cause transients/problems
 518          */
 519         debug("SPL: Charging 4P2 capacitor\n");
 520         mxs_enable_4p2_dcdc_input(0);
 521
 522         if (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ) {
 523                 /*
 524                  * If we arrived here, we were unable to recover from mx23 chip
 525                  * errata 5837. 4P2 is disabled and sufficient battery power is
 526                  * not present. Exiting to not enable DCDC power during 5V
 527                  * connected state.
 528                  */
 529                 clrbits_le32(&power_regs->hw_power_dcdc4p2,
 530                         POWER_DCDC4P2_ENABLE_DCDC);
 531                 writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
 532                         &power_regs->hw_power_5vctrl_set);
 533
 534                 debug("SPL: Unable to recover from mx23 errata 5837\n");
 535                 hang();
 536         }
 537
 538         /*
 539          * Here we set the 4p2 brownout level to something very close to 4.2V.
 540          * We then check the brownout status. If the brownout status is false,
 541          * the voltage is already close to the target voltage of 4.2V so we
 542          * can go ahead and set the 4P2 current limit to our max target limit.
 543          * If the brownout status is true, we need to ramp up the current limit
 544          * so that we don't cause large inrush current issues. We step up the
 545          * current limit until the brownout status is false or until we've
 546          * reached our maximum defined 4p2 current limit.
 547          */
 548         debug("SPL: Setting 4P2 brownout level\n");
 549         clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
 550                         POWER_DCDC4P2_BO_MASK,
 551                         22 << POWER_DCDC4P2_BO_OFFSET); /* 4.15V */
 552
 553         if (!(readl(&power_regs->hw_power_sts) & POWER_STS_DCDC_4P2_BO)) {
 554                 writel(0x3f << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET,
 555                         &power_regs->hw_power_5vctrl_set);
 556         } else {
 557                 tmp = (readl(&power_regs->hw_power_5vctrl) &
 558                         POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK) >>
 559                         POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET;
 560                 while (tmp < 0x3f) {
 561                         if (!(readl(&power_regs->hw_power_sts) &
 562                                         POWER_STS_DCDC_4P2_BO)) {
 563                                 tmp = readl(&power_regs->hw_power_5vctrl);
 564                                 tmp |= POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK;
 565                                 udelay(100);
 566                                 writel(tmp, &power_regs->hw_power_5vctrl);
 567                                 break;
 568                         } else {
 569                                 tmp++;
 570                                 tmp2 = readl(&power_regs->hw_power_5vctrl);
 571                                 tmp2 &= ~POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK;
 572                                 tmp2 |= tmp <<
 573                                         POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET;
 574                                 writel(tmp2, &power_regs->hw_power_5vctrl);
 575                                 udelay(100);
 576                         }
 577                 }
 578         }
 579
 580         clrbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_BO_MASK);
 581         writel(POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
 582 }
 583
 584 /**
 585  * mxs_power_init_dcdc_4p2_source() - Switch DC-DC converter to 4P2 source
 586  *
 587  * This function configures the DC-DC converter to be supplied from the 4P2
 588  * linear regulator.
 589  */
 590 static void mxs_power_init_dcdc_4p2_source(void)
 591 {
 592         debug("SPL: Switching DC-DC converters to 4P2\n");
 593
 594         if (!(readl(&power_regs->hw_power_dcdc4p2) &
 595                 POWER_DCDC4P2_ENABLE_DCDC)) {
 596                 debug("SPL: Already switched - aborting\n");
 597                 hang();
 598         }
 599
 600         mxs_enable_4p2_dcdc_input(1);
 601
 602         if (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ) {
 603                 clrbits_le32(&power_regs->hw_power_dcdc4p2,
 604                         POWER_DCDC4P2_ENABLE_DCDC);
 605                 writel(POWER_5VCTRL_ENABLE_DCDC,
 606                         &power_regs->hw_power_5vctrl_clr);
 607                 writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
 608                         &power_regs->hw_power_5vctrl_set);
 609         }
 610 }
 611
 612 /**
 613  * mxs_power_enable_4p2() - Power up the 4P2 regulator
 614  *
 615  * This function drives the process of powering up the 4P2 linear regulator
 616  * and switching the DC-DC converter input over to the 4P2 linear regulator.
 617  */
 618 static void mxs_power_enable_4p2(void)
 619 {
 620         uint32_t vdddctrl, vddactrl, vddioctrl;
 621         uint32_t tmp;
 622
 623         debug("SPL: Powering up 4P2 regulator\n");
 624
 625         vdddctrl = readl(&power_regs->hw_power_vdddctrl);
 626         vddactrl = readl(&power_regs->hw_power_vddactrl);
 627         vddioctrl = readl(&power_regs->hw_power_vddioctrl);
 628
 629         setbits_le32(&power_regs->hw_power_vdddctrl,
 630                 POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG |
 631                 POWER_VDDDCTRL_PWDN_BRNOUT);
 632
 633         setbits_le32(&power_regs->hw_power_vddactrl,
 634                 POWER_VDDACTRL_DISABLE_FET | POWER_VDDACTRL_ENABLE_LINREG |
 635                 POWER_VDDACTRL_PWDN_BRNOUT);
 636
 637         setbits_le32(&power_regs->hw_power_vddioctrl,
 638                 POWER_VDDIOCTRL_DISABLE_FET | POWER_VDDIOCTRL_PWDN_BRNOUT);
 639
 640         mxs_power_init_4p2_params();
 641         mxs_power_init_4p2_regulator();
 642
 643         /* Shutdown battery (none present) */
 644         if (!mxs_is_batt_ready()) {
 645                 clrbits_le32(&power_regs->hw_power_dcdc4p2,
 646                                 POWER_DCDC4P2_BO_MASK);
 647                 writel(POWER_CTRL_DCDC4P2_BO_IRQ,
 648                                 &power_regs->hw_power_ctrl_clr);
 649                 writel(POWER_CTRL_ENIRQ_DCDC4P2_BO,
 650                                 &power_regs->hw_power_ctrl_clr);
 651         }
 652
 653         mxs_power_init_dcdc_4p2_source();
 654
 655         writel(vdddctrl, &power_regs->hw_power_vdddctrl);
 656         udelay(20);
 657         writel(vddactrl, &power_regs->hw_power_vddactrl);
 658         udelay(20);
 659         writel(vddioctrl, &power_regs->hw_power_vddioctrl);
 660
 661         /*
 662          * Check if FET is enabled on either powerout and if so,
 663          * disable load.
 664          */
 665         tmp = 0;
 666         tmp |= !(readl(&power_regs->hw_power_vdddctrl) &
 667                         POWER_VDDDCTRL_DISABLE_FET);
 668         tmp |= !(readl(&power_regs->hw_power_vddactrl) &
 669                         POWER_VDDACTRL_DISABLE_FET);
 670         tmp |= !(readl(&power_regs->hw_power_vddioctrl) &
 671                         POWER_VDDIOCTRL_DISABLE_FET);
 672         if (tmp)
 673                 writel(POWER_CHARGE_ENABLE_LOAD,
 674                         &power_regs->hw_power_charge_clr);
 675
 676         debug("SPL: 4P2 regulator powered-up\n");
 677 }
 678
 679 /**
 680  * mxs_boot_valid_5v() - Boot from 5V supply
 681  *
 682  * This function configures the power block to boot from valid 5V input.
 683  * This is called only if the 5V is reliable and can properly supply the
 684  * CPU. This function proceeds to configure the 4P2 converter to be supplied
 685  * from the 5V input.
 686  */
 687 static void mxs_boot_valid_5v(void)
 688 {
 689         debug("SPL: Booting from 5V supply\n");
 690
 691         /*
 692          * Use VBUSVALID level instead of VDD5V_GT_VDDIO level to trigger a 5V
 693          * disconnect event. FIXME
 694          */
 695         writel(POWER_5VCTRL_VBUSVALID_5VDETECT,
 696                 &power_regs->hw_power_5vctrl_set);
 697
 698         /* Configure polarity to check for 5V disconnection. */
 699         writel(POWER_CTRL_POLARITY_VBUSVALID |
 700                 POWER_CTRL_POLARITY_VDD5V_GT_VDDIO,
 701                 &power_regs->hw_power_ctrl_clr);
 702
 703         writel(POWER_CTRL_VBUS_VALID_IRQ | POWER_CTRL_VDD5V_GT_VDDIO_IRQ,
 704                 &power_regs->hw_power_ctrl_clr);
 705
 706         mxs_power_enable_4p2();
 707 }
 708
 709 /**
 710  * mxs_powerdown() - Shut down the system
 711  *
 712  * This function powers down the CPU completely.
 713  */
 714 static void mxs_powerdown(void)
 715 {
 716         debug("Powering Down\n");
 717
 718         writel(POWER_RESET_UNLOCK_KEY, &power_regs->hw_power_reset);
 719         writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
 720                 &power_regs->hw_power_reset);
 721 }
 722
 723 /**
 724  * mxs_batt_boot() - Configure the power block to boot from battery input
 725  *
 726  * This function configures the power block to boot from the battery voltage
 727  * supply.
 728  */
 729 static void mxs_batt_boot(void)
 730 {
 731         debug("SPL: Configuring power block to boot from battery\n");
 732
 733         writel(POWER_5VCTRL_PWDN_5VBRNOUT,
 734                 &power_regs->hw_power_5vctrl_clr);
 735         writel(POWER_5VCTRL_ENABLE_DCDC,
 736                 &power_regs->hw_power_5vctrl_clr);
 737
 738         clrbits_le32(&power_regs->hw_power_dcdc4p2,
 739                         POWER_DCDC4P2_ENABLE_DCDC | POWER_DCDC4P2_ENABLE_4P2);
 740         writel(POWER_CHARGE_ENABLE_LOAD, &power_regs->hw_power_charge_clr);
 741
 742         /* 5V to battery handoff. */
 743         writel(POWER_5VCTRL_DCDC_XFER, &power_regs->hw_power_5vctrl_set);
 744         udelay(30);
 745         writel(POWER_5VCTRL_DCDC_XFER, &power_regs->hw_power_5vctrl_clr);
 746
 747         writel(POWER_CTRL_ENIRQ_DCDC4P2_BO, &power_regs->hw_power_ctrl_clr);
 748
 749         clrsetbits_le32(&power_regs->hw_power_minpwr,
 750                         POWER_MINPWR_HALFFETS, POWER_MINPWR_DOUBLE_FETS);
 751
 752         mxs_power_set_linreg();
 753
 754         clrbits_le32(&power_regs->hw_power_vdddctrl,
 755                 POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG);
 756
 757         clrbits_le32(&power_regs->hw_power_vddactrl,
 758                 POWER_VDDACTRL_DISABLE_FET | POWER_VDDACTRL_ENABLE_LINREG);
 759
 760         clrbits_le32(&power_regs->hw_power_vddioctrl,
 761                 POWER_VDDIOCTRL_DISABLE_FET);
 762
 763         writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
 764                 &power_regs->hw_power_5vctrl_set);
 765
 766         writel(POWER_5VCTRL_ENABLE_DCDC, &power_regs->hw_power_5vctrl_set);
 767
 768         clrsetbits_le32(&power_regs->hw_power_5vctrl,
 769                 POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
 770                 0x8 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
 771
 772         mxs_power_enable_4p2();
 773 }
 774
 775 /**
 776  * mxs_handle_5v_conflict() - Test if the 5V input is reliable
 777  *
 778  * This function tests if the 5V input can reliably supply the system. If it
 779  * can, then proceed to configuring the system to boot from 5V source, otherwise
 780  * try booting from battery supply. If we can not boot from battery supply
 781  * either, shut down the system.
 782  */
 783 static void mxs_handle_5v_conflict(void)
 784 {
 785         uint32_t tmp;
 786
 787         debug("SPL: Resolving 5V conflict\n");
 788
 789         setbits_le32(&power_regs->hw_power_vddioctrl,
 790                         POWER_VDDIOCTRL_BO_OFFSET_MASK);
 791
 792         for (;;) {
 793                 tmp = readl(&power_regs->hw_power_sts);
 794
 795                 if (tmp & POWER_STS_VDDIO_BO) {
 796                         /*
 797                          * If VDDIO has a brownout, then the VDD5V_GT_VDDIO
 798                          * becomes unreliable
 799                          */
 800                         debug("SPL: VDDIO has a brownout\n");
 801                         mxs_powerdown();
 802                         break;
 803                 }
 804
 805                 if (tmp & POWER_STS_VDD5V_GT_VDDIO) {
 806                         debug("SPL: POWER_STS_VDD5V_GT_VDDIO is set\n");
 807                         mxs_boot_valid_5v();
 808                         break;
 809                 } else {
 810                         debug("SPL: POWER_STS_VDD5V_GT_VDDIO is not set\n");
 811                         mxs_powerdown();
 812                         break;
 813                 }
 814
 815                 /*
 816                  * TODO: I can't see this being reached. We'll either
 817                  * powerdown or boot from a stable 5V supply.
 818                  */
 819                 if (tmp & POWER_STS_PSWITCH_MASK) {
 820                         debug("SPL: POWER_STS_PSWITCH_MASK is set\n");
 821                         mxs_batt_boot();
 822                         break;
 823                 }
 824         }
 825 }
 826
 827 /**
 828  * mxs_5v_boot() - Configure the power block to boot from 5V input
 829  *
 830  * This function handles configuration of the power block when supplied by
 831  * a 5V input.
 832  */
 833 static void mxs_5v_boot(void)
 834 {
 835         debug("SPL: Configuring power block to boot from 5V input\n");
 836
 837         /*
 838          * NOTE: In original IMX-Bootlets, this also checks for VBUSVALID,
 839          * but their implementation always returns 1 so we omit it here.
 840          */
 841         if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
 842                 debug("SPL: 5V VDD good\n");
 843                 mxs_boot_valid_5v();
 844                 return;
 845         }
 846
 847         udelay(1000);
 848         if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
 849                 debug("SPL: 5V VDD good (after delay)\n");
 850                 mxs_boot_valid_5v();
 851                 return;
 852         }
 853
 854         debug("SPL: 5V VDD not good\n");
 855         mxs_handle_5v_conflict();
 856 }
 857
 858 static void mxs_fixed_batt_boot(void)
 859 {
 860         writel(POWER_CTRL_ENIRQ_BATT_BO, &power_regs->hw_power_ctrl_clr);
 861
 862         writel(POWER_5VCTRL_ENABLE_DCDC |
 863                 POWER_5VCTRL_ILIMIT_EQ_ZERO |
 864                 POWER_5VCTRL_PWDN_5VBRNOUT |
 865                 POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
 866                 &power_regs->hw_power_5vctrl_set);
 867
 868         writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_set);
 869
 870         clrbits_le32(&power_regs->hw_power_vdddctrl,
 871                 POWER_VDDDCTRL_DISABLE_FET |
 872                 POWER_VDDDCTRL_ENABLE_LINREG |
 873                 POWER_VDDDCTRL_DISABLE_STEPPING);
 874
 875         clrbits_le32(&power_regs->hw_power_vddactrl,
 876                 POWER_VDDACTRL_DISABLE_FET | POWER_VDDACTRL_ENABLE_LINREG |
 877                 POWER_VDDACTRL_DISABLE_STEPPING);
 878
 879         clrbits_le32(&power_regs->hw_power_vddioctrl,
 880                 POWER_VDDIOCTRL_DISABLE_FET |
 881                 POWER_VDDIOCTRL_DISABLE_STEPPING);
 882
 883         /* Stop 5V detection */
 884         writel(POWER_5VCTRL_PWRUP_VBUS_CMPS,
 885                 &power_regs->hw_power_5vctrl_clr);
 886 }
 887
 888 /**
 889  * mxs_init_batt_bo() - Configure battery brownout threshold
 890  *
 891  * This function configures the battery input brownout threshold. The value
 892  * at which the battery brownout happens is configured to 3.0V in the code.
 893  */
 894 static void mxs_init_batt_bo(void)
 895 {
 896         debug("SPL: Initialising battery brown-out level to %u.%uV\n",
 897                 (BATT_BO_VAL * 40 + 2400) / 1000,
 898                 (BATT_BO_VAL * 40 + 2400) / 100 % 10);
 899
 900         /* Brownout at 3V */
 901         clrsetbits_le32(&power_regs->hw_power_battmonitor,
 902                 POWER_BATTMONITOR_BRWNOUT_LVL_MASK,
 903                 BATT_BO_VAL << POWER_BATTMONITOR_BRWNOUT_LVL_OFFSET);
 904
 905         writel(POWER_CTRL_BATT_BO_IRQ, &power_regs->hw_power_ctrl_clr);
 906         writel(POWER_CTRL_ENIRQ_BATT_BO, &power_regs->hw_power_ctrl_clr);
 907 }
 908
 909 /**
 910  * mxs_switch_vddd_to_dcdc_source() - Switch VDDD rail to DC-DC converter
 911  *
 912  * This function turns off the VDDD linear regulator and therefore makes
 913  * the VDDD rail be supplied only by the DC-DC converter.
 914  */
 915 static void mxs_switch_vddd_to_dcdc_source(void)
 916 {
 917         debug("SPL: Switching VDDD to DC-DC converters\n");
 918
 919         clrsetbits_le32(&power_regs->hw_power_vdddctrl,
 920                 POWER_VDDDCTRL_LINREG_OFFSET_MASK,
 921                 POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW);
 922
 923         clrbits_le32(&power_regs->hw_power_vdddctrl,
 924                 POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG |
 925                 POWER_VDDDCTRL_DISABLE_STEPPING);
 926 }
 927
 928 /**
 929  * mxs_power_configure_power_source() - Configure power block source
 930  *
 931  * This function is the core of the power configuration logic. The function
 932  * selects the power block input source and configures the whole power block
 933  * accordingly. After the configuration is complete and the system is stable
 934  * again, the function switches the CPU clock source back to PLL. Finally,
 935  * the function switches the voltage rails to DC-DC converter.
 936  */
 937 static void mxs_power_configure_power_source(void)
 938 {
 939         struct mxs_lradc_regs *lradc_regs =
 940                 (struct mxs_lradc_regs *)MXS_LRADC_BASE;
 941
 942         debug("SPL: Configuring power source\n");
 943
 944         mxs_src_power_init();
 945
 946         if (!fixed_batt_supply) {
 947                 if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
 948                         if (mxs_is_batt_ready()) {
 949                                 /* 5V source detected, good battery detected. */
 950                                 mxs_batt_boot();
 951                         } else {
 952                                 if (!mxs_is_batt_good()) {
 953                                         /* 5V source detected, bad battery detected. */
 954                                         writel(LRADC_CONVERSION_AUTOMATIC,
 955                                                 &lradc_regs->hw_lradc_conversion_clr);
 956                                         clrbits_le32(&power_regs->hw_power_battmonitor,
 957                                                 POWER_BATTMONITOR_BATT_VAL_MASK);
 958                                 }
 959                                 mxs_5v_boot();
 960                         }
 961                 } else {
 962                         /* 5V not detected, booting from battery. */
 963                         mxs_batt_boot();
 964                 }
 965         } else {
 966                 mxs_fixed_batt_boot();
 967         }
 968
 969         /*
 970          * TODO: Do not switch CPU clock to PLL if we are VDD5V is sourced
 971          * from USB VBUS
 972          */
 973         mxs_power_clock2pll();
 974
 975         mxs_init_batt_bo();
 976
 977         mxs_switch_vddd_to_dcdc_source();
 978
 979 #ifdef CONFIG_SOC_MX23
 980         /* Fire up the VDDMEM LinReg now that we're all set. */
 981         debug("SPL: Enabling mx23 VDDMEM linear regulator\n");
 982         writel(POWER_VDDMEMCTRL_ENABLE_LINREG | POWER_VDDMEMCTRL_ENABLE_ILIMIT,
 983                 &power_regs->hw_power_vddmemctrl);
 984 #endif
 985 }
 986
 987 /**
 988  * mxs_enable_output_rail_protection() - Enable power rail protection
 989  *
 990  * This function enables overload protection on the power rails. This is
 991  * triggered if the power rails' voltage drops rapidly due to overload and
 992  * in such case, the supply to the powerrail is cut-off, protecting the
 993  * CPU from damage. Note that under such condition, the system will likely
 994  * crash or misbehave.
 995  */
 996 static void mxs_enable_output_rail_protection(void)
 997 {
 998         debug("SPL: Enabling output rail protection\n");
 999
1000         writel(POWER_CTRL_VDDD_BO_IRQ | POWER_CTRL_VDDA_BO_IRQ |
1001                 POWER_CTRL_VDDIO_BO_IRQ, &power_regs->hw_power_ctrl_clr);
1002
1003         setbits_le32(&power_regs->hw_power_vdddctrl,
1004                         POWER_VDDDCTRL_PWDN_BRNOUT);
1005
1006         setbits_le32(&power_regs->hw_power_vddactrl,
1007                         POWER_VDDACTRL_PWDN_BRNOUT);
1008
1009         setbits_le32(&power_regs->hw_power_vddioctrl,
1010                         POWER_VDDIOCTRL_PWDN_BRNOUT);
1011 }
1012
1013 /**
1014  * mxs_get_vddio_power_source_off() - Get VDDIO rail power source
1015  *
1016  * This function tests if the VDDIO rail is supplied by linear regulator
1017  * or by the DC-DC converter. Returns 1 if powered by linear regulator,
1018  * returns 0 if powered by the DC-DC converter.
1019  */
1020 static int mxs_get_vddio_power_source_off(void)
1021 {
1022         uint32_t tmp;
1023
1024         if ((readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) &&
1025                 !(readl(&power_regs->hw_power_5vctrl) &
1026                         POWER_5VCTRL_ILIMIT_EQ_ZERO)) {
1027
1028                 tmp = readl(&power_regs->hw_power_vddioctrl);
1029                 if (tmp & POWER_VDDIOCTRL_DISABLE_FET) {
1030                         if ((tmp & POWER_VDDIOCTRL_LINREG_OFFSET_MASK) ==
1031                                 POWER_VDDIOCTRL_LINREG_OFFSET_0STEPS) {
1032                                 return 1;
1033                         }
1034                 }
1035
1036                 if (!(readl(&power_regs->hw_power_5vctrl) &
1037                         POWER_5VCTRL_ENABLE_DCDC)) {
1038                         if ((tmp & POWER_VDDIOCTRL_LINREG_OFFSET_MASK) ==
1039                                 POWER_VDDIOCTRL_LINREG_OFFSET_0STEPS) {
1040                                 return 1;
1041                         }
1042                 }
1043         }
1044
1045         return 0;
1046 }
1047
1048 /**
1049  * mxs_get_vddd_power_source_off() - Get VDDD rail power source
1050  *
1051  * This function tests if the VDDD rail is supplied by linear regulator
1052  * or by the DC-DC converter. Returns 1 if powered by linear regulator,
1053  * returns 0 if powered by the DC-DC converter.
1054  */
1055 static int mxs_get_vddd_power_source_off(void)
1056 {
1057         uint32_t tmp;
1058
1059         tmp = readl(&power_regs->hw_power_vdddctrl);
1060         if (tmp & POWER_VDDDCTRL_DISABLE_FET) {
1061                 if ((tmp & POWER_VDDDCTRL_LINREG_OFFSET_MASK) ==
1062                         POWER_VDDDCTRL_LINREG_OFFSET_0STEPS) {
1063                         return 1;
1064                 }
1065         }
1066
1067         if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
1068                 if (!(readl(&power_regs->hw_power_5vctrl) &
1069                         POWER_5VCTRL_ENABLE_DCDC)) {
1070                         return 1;
1071                 }
1072         }
1073
1074         if (!(tmp & POWER_VDDDCTRL_ENABLE_LINREG)) {
1075                 if ((tmp & POWER_VDDDCTRL_LINREG_OFFSET_MASK) ==
1076                         POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW) {
1077                         return 1;
1078                 }
1079         }
1080
1081         return 0;
1082 }
1083
1084 static int mxs_get_vdda_power_source_off(void)
1085 {
1086         uint32_t tmp;
1087
1088         tmp = readl(&power_regs->hw_power_vddactrl);
1089         if (tmp & POWER_VDDACTRL_DISABLE_FET) {
1090                 if ((tmp & POWER_VDDACTRL_LINREG_OFFSET_MASK) ==
1091                         POWER_VDDACTRL_LINREG_OFFSET_0STEPS) {
1092                         return 1;
1093                 }
1094         }
1095
1096         if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
1097                 if (!(readl(&power_regs->hw_power_5vctrl) &
1098                         POWER_5VCTRL_ENABLE_DCDC)) {
1099                         return 1;
1100                 }
1101         }
1102
1103         if (!(tmp & POWER_VDDACTRL_ENABLE_LINREG)) {
1104                 if ((tmp & POWER_VDDACTRL_LINREG_OFFSET_MASK) ==
1105                         POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW) {
1106                         return 1;
1107                 }
1108         }
1109
1110         return 0;
1111 }
1112
1113 struct mxs_vddx_cfg {
1114         uint32_t                *reg;
1115         uint8_t                 step_mV;
1116         uint16_t                lowest_mV;
1117         uint16_t                highest_mV;
1118         int                     (*powered_by_linreg)(void);
1119         uint32_t                trg_mask;
1120         uint32_t                bo_irq;
1121         uint32_t                bo_enirq;
1122         uint32_t                bo_offset_mask;
1123         uint32_t                bo_offset_offset;
1124         uint16_t                bo_min_mV;
1125         uint16_t                bo_max_mV;
1126 };
1127
1128 #define POWER_REG(n)            &((struct mxs_power_regs *)MXS_POWER_BASE)->n
1129
1130 static const struct mxs_vddx_cfg mxs_vddio_cfg = {
1131         .reg                    = POWER_REG(hw_power_vddioctrl),
1132 #if defined(CONFIG_SOC_MX23)
1133         .step_mV                = 25,
1134 #else
1135         .step_mV                = 50,
1136 #endif
1137         .lowest_mV              = 2800,
1138         .highest_mV             = 3600,
1139         .powered_by_linreg      = mxs_get_vddio_power_source_off,
1140         .trg_mask               = POWER_VDDIOCTRL_TRG_MASK,
1141         .bo_irq                 = POWER_CTRL_VDDIO_BO_IRQ,
1142         .bo_enirq               = POWER_CTRL_ENIRQ_VDDIO_BO,
1143         .bo_offset_mask         = POWER_VDDIOCTRL_BO_OFFSET_MASK,
1144         .bo_offset_offset       = POWER_VDDIOCTRL_BO_OFFSET_OFFSET,
1145         .bo_min_mV              = 2700,
1146         .bo_max_mV              = 3475,
1147 };
1148
1149 static const struct mxs_vddx_cfg mxs_vddd_cfg = {
1150         .reg                    = POWER_REG(hw_power_vdddctrl),
1151         .step_mV                = 25,
1152         .lowest_mV              = 800,
1153         .highest_mV             = 1575,
1154         .powered_by_linreg      = mxs_get_vddd_power_source_off,
1155         .trg_mask               = POWER_VDDDCTRL_TRG_MASK,
1156         .bo_irq                 = POWER_CTRL_VDDD_BO_IRQ,
1157         .bo_enirq               = POWER_CTRL_ENIRQ_VDDD_BO,
1158         .bo_offset_mask         = POWER_VDDDCTRL_BO_OFFSET_MASK,
1159         .bo_offset_offset       = POWER_VDDDCTRL_BO_OFFSET_OFFSET,
1160         .bo_min_mV              = 800,
1161         .bo_max_mV              = 1475,
1162 };
1163
1164 static const struct mxs_vddx_cfg mxs_vdda_cfg = {
1165         .reg                    = POWER_REG(hw_power_vddactrl),
1166         .step_mV                = 25,
1167         .lowest_mV              = 1800,
1168         .highest_mV             = 3600,
1169         .powered_by_linreg      = mxs_get_vdda_power_source_off,
1170         .trg_mask               = POWER_VDDACTRL_TRG_MASK,
1171         .bo_irq                 = POWER_CTRL_VDDA_BO_IRQ,
1172         .bo_enirq               = POWER_CTRL_ENIRQ_VDDA_BO,
1173         .bo_offset_mask         = POWER_VDDACTRL_BO_OFFSET_MASK,
1174         .bo_offset_offset       = POWER_VDDACTRL_BO_OFFSET_OFFSET,
1175         .bo_min_mV              = 1400,
1176         .bo_max_mV              = 2175,
1177 };
1178
1179 #ifdef CONFIG_SOC_MX23
1180 static const struct mxs_vddx_cfg mxs_vddmem_cfg = {
1181         .reg                    = POWER_REG(hw_power_vddmemctrl),
1182         .step_mV                = 50,
1183         .lowest_mV              = 1500,
1184         .highest_mV             = 1700,
1185         .powered_by_linreg      = NULL,
1186         .trg_mask               = POWER_VDDMEMCTRL_TRG_MASK,
1187         .bo_irq                 = 0,
1188         .bo_enirq               = 0,
1189         .bo_offset_mask         = 0,
1190         .bo_offset_offset       = 0,
1191 };
1192 #endif
1193
1194 /**
1195  * mxs_power_set_vddx() - Configure voltage on DC-DC converter rail
1196  * @cfg:                Configuration data of the DC-DC converter rail
1197  * @new_target:         New target voltage of the DC-DC converter rail
1198  * @new_brownout:       New brownout trigger voltage
1199  *
1200  * This function configures the output voltage on the DC-DC converter rail.
1201  * The rail is selected by the @cfg argument. The new voltage target is
1202  * selected by the @new_target and the voltage is specified in mV. The
1203  * new brownout value is selected by the @new_brownout argument and the
1204  * value is also in mV.
1205  */
1206 static void mxs_power_set_vddx(const struct mxs_vddx_cfg *cfg,
1207                                 uint32_t new_target, uint32_t bo_offset)
1208 {
1209         uint32_t cur_target, diff, bo_int = 0;
1210         int powered_by_linreg = 0;
1211         int adjust_up;
1212
1213         if (new_target < cfg->lowest_mV) {
1214                 new_target = cfg->lowest_mV;
1215         }
1216         if (new_target > cfg->highest_mV) {
1217                 new_target = cfg->highest_mV;
1218         }
1219
1220         if (new_target - bo_offset < cfg->bo_min_mV) {
1221                 bo_offset = new_target - cfg->bo_min_mV;
1222         } else if (new_target - bo_offset > cfg->bo_max_mV) {
1223                 bo_offset = new_target - cfg->bo_max_mV;
1224         }
1225
1226         bo_offset = DIV_ROUND_CLOSEST(bo_offset, cfg->step_mV);
1227
1228         cur_target = readl(cfg->reg);
1229         cur_target &= cfg->trg_mask;
1230         cur_target *= cfg->step_mV;
1231         cur_target += cfg->lowest_mV;
1232
1233         adjust_up = new_target > cur_target;
1234         if (cfg->powered_by_linreg)
1235                 powered_by_linreg = cfg->powered_by_linreg();
1236
1237         if (adjust_up && cfg->bo_irq) {
1238                 if (powered_by_linreg) {
1239                         bo_int = readl(&power_regs->hw_power_ctrl);
1240                         writel(cfg->bo_enirq, &power_regs->hw_power_ctrl_clr);
1241                 }
1242                 setbits_le32(cfg->reg, cfg->bo_offset_mask);
1243         }
1244
1245         do {
1246                 if (abs(new_target - cur_target) > 100) {
1247                         if (adjust_up)
1248                                 diff = cur_target + 100;
1249                         else
1250                                 diff = cur_target - 100;
1251                 } else {
1252                         diff = new_target;
1253                 }
1254
1255                 diff -= cfg->lowest_mV;
1256                 diff /= cfg->step_mV;
1257
1258                 clrsetbits_le32(cfg->reg, cfg->trg_mask, diff);
1259
1260                 if (powered_by_linreg ||
1261                         (readl(&power_regs->hw_power_sts) &
1262                                 POWER_STS_VDD5V_GT_VDDIO)) {
1263                         udelay(500);
1264                 } else {
1265                         while (!(readl(&power_regs->hw_power_sts) &
1266                                         POWER_STS_DC_OK)) {
1267
1268                         }
1269                 }
1270
1271                 cur_target = readl(cfg->reg);
1272                 cur_target &= cfg->trg_mask;
1273                 cur_target *= cfg->step_mV;
1274                 cur_target += cfg->lowest_mV;
1275         } while (new_target > cur_target);
1276
1277         if (cfg->bo_irq) {
1278                 if (adjust_up && powered_by_linreg) {
1279                         writel(cfg->bo_irq, &power_regs->hw_power_ctrl_clr);
1280                         if (bo_int & cfg->bo_enirq)
1281                                 writel(cfg->bo_enirq,
1282                                         &power_regs->hw_power_ctrl_set);
1283                 }
1284
1285                 clrsetbits_le32(cfg->reg, cfg->bo_offset_mask,
1286                                 bo_offset << cfg->bo_offset_offset);
1287         }
1288 }
1289
1290 /**
1291  * mxs_setup_batt_detect() - Start the battery voltage measurement logic
1292  *
1293  * This function starts and configures the LRADC block. This allows the
1294  * power initialization code to measure battery voltage and based on this
1295  * knowledge, decide whether to boot at all, boot from battery or boot
1296  * from 5V input.
1297  */
1298 static void mxs_setup_batt_detect(void)
1299 {
1300         debug("SPL: Starting battery voltage measurement logic\n");
1301
1302         mxs_lradc_init();
1303         mxs_lradc_enable_batt_measurement();
1304         udelay(10);
1305 }
1306
1307 /**
1308  * mxs_ungate_power() - Ungate the POWER block
1309  *
1310  * This function ungates clock to the power block. In case the power block
1311  * was still gated at this point, it will not be possible to configure the
1312  * block and therefore the power initialization would fail. This function
1313  * is only needed on i.MX233, on i.MX28 the power block is always ungated.
1314  */
1315 static void mxs_ungate_power(void)
1316 {
1317 #ifdef CONFIG_SOC_MX23
1318         writel(POWER_CTRL_CLKGATE, &power_regs->hw_power_ctrl_clr);
1319 #endif
1320 }
1321
1322 #ifdef CONFIG_CONFIG_MACH_MX28EVK
1323 #define auto_restart 1
1324 #else
1325 #define auto_restart 0
1326 #endif
1327
1328 /**
1329  * mxs_power_init() - The power block init main function
1330  *
1331  * This function calls all the power block initialization functions in
1332  * proper sequence to start the power block.
1333  */
1334 #define VDDX_VAL(v)     (v) / 1000, (v) / 100 % 10
1335
1336 void mxs_power_init(void)
1337 {
1338         debug("SPL: Initialising Power Block\n");
1339
1340         mxs_ungate_power();
1341
1342         mxs_power_clock2xtal();
1343         if (mxs_power_set_auto_restart(auto_restart)) {
1344                 serial_puts("Inconsistent value in RTC_PERSISTENT0 register; power-on-reset required\n");
1345         }
1346         mxs_power_set_linreg();
1347
1348         if (!fixed_batt_supply) {
1349                 mxs_power_setup_5v_detect();
1350                 mxs_setup_batt_detect();
1351         }
1352
1353         mxs_power_configure_power_source();
1354         mxs_enable_output_rail_protection();
1355
1356         debug("SPL: Setting VDDIO to %uV%u (brownout @ %uv%02u)\n",
1357                 VDDX_VAL(VDDIO_VAL), VDDX_VAL(VDDIO_VAL - VDDIO_BO_VAL));
1358         mxs_power_set_vddx(&mxs_vddio_cfg, VDDIO_VAL, VDDIO_BO_VAL);
1359         debug("SPL: Setting VDDD to %uV%u (brownout @ %uv%02u)\n",
1360                 VDDX_VAL(VDDD_VAL), VDDX_VAL(VDDD_VAL - VDDD_BO_VAL));
1361         mxs_power_set_vddx(&mxs_vddd_cfg, VDDD_VAL, VDDD_BO_VAL);
1362         debug("SPL: Setting VDDA to %uV%u (brownout @ %uv%02u)\n",
1363                 VDDX_VAL(VDDA_VAL), VDDX_VAL(VDDA_VAL - VDDA_BO_VAL));
1364         mxs_power_set_vddx(&mxs_vdda_cfg, VDDA_VAL, VDDA_BO_VAL);
1365 #ifdef CONFIG_SOC_MX23
1366         debug("SPL: Setting VDDMEM to %uV%u (brownout @ %uv%02u)\n",
1367                 VDDX_VAL(VDDMEM_VAL), VDDX_VAL(VDDMEM_VAL - VDDMEM_BO_VAL));
1368         mxs_power_set_vddx(&mxs_vddmem_cfg, VDDMEM_VAL, VDDMEM_BO_VAL);
1369 #else
1370         clrbits_le32(&power_regs->hw_power_vddmemctrl,
1371                 POWER_VDDMEMCTRL_ENABLE_LINREG);
1372 #endif
1373         writel(POWER_CTRL_VDDD_BO_IRQ | POWER_CTRL_VDDA_BO_IRQ |
1374                 POWER_CTRL_VDDIO_BO_IRQ | POWER_CTRL_VDD5V_DROOP_IRQ |
1375                 POWER_CTRL_VBUS_VALID_IRQ | POWER_CTRL_BATT_BO_IRQ |
1376                 POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
1377         if (!fixed_batt_supply)
1378                 writel(POWER_5VCTRL_PWDN_5VBRNOUT,
1379                         &power_regs->hw_power_5vctrl_set);
1380 }
1381
1382 #ifdef  CONFIG_SPL_MXS_PSWITCH_WAIT
1383 /**
1384  * mxs_power_wait_pswitch() - Wait for power switch to be pressed
1385  *
1386  * This function waits until the power-switch was pressed to start booting
1387  * the board.
1388  */
1389 void mxs_power_wait_pswitch(void)
1390 {
1391         debug("SPL: Waiting for power switch input\n");
1392         while (!(readl(&power_regs->hw_power_sts) & POWER_STS_PSWITCH_MASK))
1393                 ;
1394 }
1395 #endif