Merge branch 'master' of git://git.denx.de/u-boot-arm
[glsdk/glsdk-u-boot.git] / 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  * See file CREDITS for list of people who contributed to this
8  * project.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License as
12  * published by the Free Software Foundation; either version 2 of
13  * the License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
23  * MA 02111-1307 USA
24  */
26 #include <common.h>
27 #include <config.h>
28 #include <asm/io.h>
29 #include <asm/arch/imx-regs.h>
31 #include "mxs_init.h"
33 static void mxs_power_clock2xtal(void)
34 {
35         struct mxs_clkctrl_regs *clkctrl_regs =
36                 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
38         /* Set XTAL as CPU reference clock */
39         writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
40                 &clkctrl_regs->hw_clkctrl_clkseq_set);
41 }
43 static void mxs_power_clock2pll(void)
44 {
45         struct mxs_clkctrl_regs *clkctrl_regs =
46                 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
48         setbits_le32(&clkctrl_regs->hw_clkctrl_pll0ctrl0,
49                         CLKCTRL_PLL0CTRL0_POWER);
50         early_delay(100);
51         setbits_le32(&clkctrl_regs->hw_clkctrl_clkseq,
52                         CLKCTRL_CLKSEQ_BYPASS_CPU);
53 }
55 static void mxs_power_clear_auto_restart(void)
56 {
57         struct mxs_rtc_regs *rtc_regs =
58                 (struct mxs_rtc_regs *)MXS_RTC_BASE;
60         writel(RTC_CTRL_SFTRST, &rtc_regs->hw_rtc_ctrl_clr);
61         while (readl(&rtc_regs->hw_rtc_ctrl) & RTC_CTRL_SFTRST)
62                 ;
64         writel(RTC_CTRL_CLKGATE, &rtc_regs->hw_rtc_ctrl_clr);
65         while (readl(&rtc_regs->hw_rtc_ctrl) & RTC_CTRL_CLKGATE)
66                 ;
68         /*
69          * Due to the hardware design bug of mx28 EVK-A
70          * we need to set the AUTO_RESTART bit.
71          */
72         if (readl(&rtc_regs->hw_rtc_persistent0) & RTC_PERSISTENT0_AUTO_RESTART)
73                 return;
75         while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_NEW_REGS_MASK)
76                 ;
78         setbits_le32(&rtc_regs->hw_rtc_persistent0,
79                         RTC_PERSISTENT0_AUTO_RESTART);
80         writel(RTC_CTRL_FORCE_UPDATE, &rtc_regs->hw_rtc_ctrl_set);
81         writel(RTC_CTRL_FORCE_UPDATE, &rtc_regs->hw_rtc_ctrl_clr);
82         while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_NEW_REGS_MASK)
83                 ;
84         while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_STALE_REGS_MASK)
85                 ;
86 }
88 static void mxs_power_set_linreg(void)
89 {
90         struct mxs_power_regs *power_regs =
91                 (struct mxs_power_regs *)MXS_POWER_BASE;
93         /* Set linear regulator 25mV below switching converter */
94         clrsetbits_le32(&power_regs->hw_power_vdddctrl,
95                         POWER_VDDDCTRL_LINREG_OFFSET_MASK,
96                         POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW);
98         clrsetbits_le32(&power_regs->hw_power_vddactrl,
99                         POWER_VDDACTRL_LINREG_OFFSET_MASK,
100                         POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW);
102         clrsetbits_le32(&power_regs->hw_power_vddioctrl,
103                         POWER_VDDIOCTRL_LINREG_OFFSET_MASK,
104                         POWER_VDDIOCTRL_LINREG_OFFSET_1STEPS_BELOW);
107 static int mxs_get_batt_volt(void)
109         struct mxs_power_regs *power_regs =
110                 (struct mxs_power_regs *)MXS_POWER_BASE;
111         uint32_t volt = readl(&power_regs->hw_power_battmonitor);
112         volt &= POWER_BATTMONITOR_BATT_VAL_MASK;
113         volt >>= POWER_BATTMONITOR_BATT_VAL_OFFSET;
114         volt *= 8;
115         return volt;
118 static int mxs_is_batt_ready(void)
120         return (mxs_get_batt_volt() >= 3600);
123 static int mxs_is_batt_good(void)
125         struct mxs_power_regs *power_regs =
126                 (struct mxs_power_regs *)MXS_POWER_BASE;
127         uint32_t volt = mxs_get_batt_volt();
129         if ((volt >= 2400) && (volt <= 4300))
130                 return 1;
132         clrsetbits_le32(&power_regs->hw_power_5vctrl,
133                 POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
134                 0x3 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
135         writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
136                 &power_regs->hw_power_5vctrl_clr);
138         clrsetbits_le32(&power_regs->hw_power_charge,
139                 POWER_CHARGE_STOP_ILIMIT_MASK | POWER_CHARGE_BATTCHRG_I_MASK,
140                 POWER_CHARGE_STOP_ILIMIT_10MA | 0x3);
142         writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_clr);
143         writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
144                 &power_regs->hw_power_5vctrl_clr);
146         early_delay(500000);
148         volt = mxs_get_batt_volt();
150         if (volt >= 3500)
151                 return 0;
153         if (volt >= 2400)
154                 return 1;
156         writel(POWER_CHARGE_STOP_ILIMIT_MASK | POWER_CHARGE_BATTCHRG_I_MASK,
157                 &power_regs->hw_power_charge_clr);
158         writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_set);
160         return 0;
163 static void mxs_power_setup_5v_detect(void)
165         struct mxs_power_regs *power_regs =
166                 (struct mxs_power_regs *)MXS_POWER_BASE;
168         /* Start 5V detection */
169         clrsetbits_le32(&power_regs->hw_power_5vctrl,
170                         POWER_5VCTRL_VBUSVALID_TRSH_MASK,
171                         POWER_5VCTRL_VBUSVALID_TRSH_4V4 |
172                         POWER_5VCTRL_PWRUP_VBUS_CMPS);
175 static void mxs_src_power_init(void)
177         struct mxs_power_regs *power_regs =
178                 (struct mxs_power_regs *)MXS_POWER_BASE;
180         /* Improve efficieny and reduce transient ripple */
181         writel(POWER_LOOPCTRL_TOGGLE_DIF | POWER_LOOPCTRL_EN_CM_HYST |
182                 POWER_LOOPCTRL_EN_DF_HYST, &power_regs->hw_power_loopctrl_set);
184         clrsetbits_le32(&power_regs->hw_power_dclimits,
185                         POWER_DCLIMITS_POSLIMIT_BUCK_MASK,
186                         0x30 << POWER_DCLIMITS_POSLIMIT_BUCK_OFFSET);
188         setbits_le32(&power_regs->hw_power_battmonitor,
189                         POWER_BATTMONITOR_EN_BATADJ);
191         /* Increase the RCSCALE level for quick DCDC response to dynamic load */
192         clrsetbits_le32(&power_regs->hw_power_loopctrl,
193                         POWER_LOOPCTRL_EN_RCSCALE_MASK,
194                         POWER_LOOPCTRL_RCSCALE_THRESH |
195                         POWER_LOOPCTRL_EN_RCSCALE_8X);
197         clrsetbits_le32(&power_regs->hw_power_minpwr,
198                         POWER_MINPWR_HALFFETS, POWER_MINPWR_DOUBLE_FETS);
200         /* 5V to battery handoff ... FIXME */
201         setbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
202         early_delay(30);
203         clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
206 static void mxs_power_init_4p2_params(void)
208         struct mxs_power_regs *power_regs =
209                 (struct mxs_power_regs *)MXS_POWER_BASE;
211         /* Setup 4P2 parameters */
212         clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
213                 POWER_DCDC4P2_CMPTRIP_MASK | POWER_DCDC4P2_TRG_MASK,
214                 POWER_DCDC4P2_TRG_4V2 | (31 << POWER_DCDC4P2_CMPTRIP_OFFSET));
216         clrsetbits_le32(&power_regs->hw_power_5vctrl,
217                 POWER_5VCTRL_HEADROOM_ADJ_MASK,
218                 0x4 << POWER_5VCTRL_HEADROOM_ADJ_OFFSET);
220         clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
221                 POWER_DCDC4P2_DROPOUT_CTRL_MASK,
222                 POWER_DCDC4P2_DROPOUT_CTRL_100MV |
223                 POWER_DCDC4P2_DROPOUT_CTRL_SRC_SEL);
225         clrsetbits_le32(&power_regs->hw_power_5vctrl,
226                 POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
227                 0x3f << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
230 static void mxs_enable_4p2_dcdc_input(int xfer)
232         struct mxs_power_regs *power_regs =
233                 (struct mxs_power_regs *)MXS_POWER_BASE;
234         uint32_t tmp, vbus_thresh, vbus_5vdetect, pwd_bo;
235         uint32_t prev_5v_brnout, prev_5v_droop;
237         prev_5v_brnout = readl(&power_regs->hw_power_5vctrl) &
238                                 POWER_5VCTRL_PWDN_5VBRNOUT;
239         prev_5v_droop = readl(&power_regs->hw_power_ctrl) &
240                                 POWER_CTRL_ENIRQ_VDD5V_DROOP;
242         clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_PWDN_5VBRNOUT);
243         writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
244                 &power_regs->hw_power_reset);
246         clrbits_le32(&power_regs->hw_power_ctrl, POWER_CTRL_ENIRQ_VDD5V_DROOP);
248         if (xfer && (readl(&power_regs->hw_power_5vctrl) &
249                         POWER_5VCTRL_ENABLE_DCDC)) {
250                 return;
251         }
253         /*
254          * Recording orignal values that will be modified temporarlily
255          * to handle a chip bug. See chip errata for CQ ENGR00115837
256          */
257         tmp = readl(&power_regs->hw_power_5vctrl);
258         vbus_thresh = tmp & POWER_5VCTRL_VBUSVALID_TRSH_MASK;
259         vbus_5vdetect = tmp & POWER_5VCTRL_VBUSVALID_5VDETECT;
261         pwd_bo = readl(&power_regs->hw_power_minpwr) & POWER_MINPWR_PWD_BO;
263         /*
264          * Disable mechanisms that get erroneously tripped by when setting
265          * the DCDC4P2 EN_DCDC
266          */
267         clrbits_le32(&power_regs->hw_power_5vctrl,
268                 POWER_5VCTRL_VBUSVALID_5VDETECT |
269                 POWER_5VCTRL_VBUSVALID_TRSH_MASK);
271         writel(POWER_MINPWR_PWD_BO, &power_regs->hw_power_minpwr_set);
273         if (xfer) {
274                 setbits_le32(&power_regs->hw_power_5vctrl,
275                                 POWER_5VCTRL_DCDC_XFER);
276                 early_delay(20);
277                 clrbits_le32(&power_regs->hw_power_5vctrl,
278                                 POWER_5VCTRL_DCDC_XFER);
280                 setbits_le32(&power_regs->hw_power_5vctrl,
281                                 POWER_5VCTRL_ENABLE_DCDC);
282         } else {
283                 setbits_le32(&power_regs->hw_power_dcdc4p2,
284                                 POWER_DCDC4P2_ENABLE_DCDC);
285         }
287         early_delay(25);
289         clrsetbits_le32(&power_regs->hw_power_5vctrl,
290                         POWER_5VCTRL_VBUSVALID_TRSH_MASK, vbus_thresh);
292         if (vbus_5vdetect)
293                 writel(vbus_5vdetect, &power_regs->hw_power_5vctrl_set);
295         if (!pwd_bo)
296                 clrbits_le32(&power_regs->hw_power_minpwr, POWER_MINPWR_PWD_BO);
298         while (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ)
299                 writel(POWER_CTRL_VBUS_VALID_IRQ,
300                         &power_regs->hw_power_ctrl_clr);
302         if (prev_5v_brnout) {
303                 writel(POWER_5VCTRL_PWDN_5VBRNOUT,
304                         &power_regs->hw_power_5vctrl_set);
305                 writel(POWER_RESET_UNLOCK_KEY,
306                         &power_regs->hw_power_reset);
307         } else {
308                 writel(POWER_5VCTRL_PWDN_5VBRNOUT,
309                         &power_regs->hw_power_5vctrl_clr);
310                 writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
311                         &power_regs->hw_power_reset);
312         }
314         while (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VDD5V_DROOP_IRQ)
315                 writel(POWER_CTRL_VDD5V_DROOP_IRQ,
316                         &power_regs->hw_power_ctrl_clr);
318         if (prev_5v_droop)
319                 clrbits_le32(&power_regs->hw_power_ctrl,
320                                 POWER_CTRL_ENIRQ_VDD5V_DROOP);
321         else
322                 setbits_le32(&power_regs->hw_power_ctrl,
323                                 POWER_CTRL_ENIRQ_VDD5V_DROOP);
326 static void mxs_power_init_4p2_regulator(void)
328         struct mxs_power_regs *power_regs =
329                 (struct mxs_power_regs *)MXS_POWER_BASE;
330         uint32_t tmp, tmp2;
332         setbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_ENABLE_4P2);
334         writel(POWER_CHARGE_ENABLE_LOAD, &power_regs->hw_power_charge_set);
336         writel(POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
337                 &power_regs->hw_power_5vctrl_clr);
338         clrbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_TRG_MASK);
340         /* Power up the 4p2 rail and logic/control */
341         writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
342                 &power_regs->hw_power_5vctrl_clr);
344         /*
345          * Start charging up the 4p2 capacitor. We ramp of this charge
346          * gradually to avoid large inrush current from the 5V cable which can
347          * cause transients/problems
348          */
349         mxs_enable_4p2_dcdc_input(0);
351         if (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ) {
352                 /*
353                  * If we arrived here, we were unable to recover from mx23 chip
354                  * errata 5837. 4P2 is disabled and sufficient battery power is
355                  * not present. Exiting to not enable DCDC power during 5V
356                  * connected state.
357                  */
358                 clrbits_le32(&power_regs->hw_power_dcdc4p2,
359                         POWER_DCDC4P2_ENABLE_DCDC);
360                 writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
361                         &power_regs->hw_power_5vctrl_set);
362                 hang();
363         }
365         /*
366          * Here we set the 4p2 brownout level to something very close to 4.2V.
367          * We then check the brownout status. If the brownout status is false,
368          * the voltage is already close to the target voltage of 4.2V so we
369          * can go ahead and set the 4P2 current limit to our max target limit.
370          * If the brownout status is true, we need to ramp us the current limit
371          * so that we don't cause large inrush current issues. We step up the
372          * current limit until the brownout status is false or until we've
373          * reached our maximum defined 4p2 current limit.
374          */
375         clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
376                         POWER_DCDC4P2_BO_MASK,
377                         22 << POWER_DCDC4P2_BO_OFFSET); /* 4.15V */
379         if (!(readl(&power_regs->hw_power_sts) & POWER_STS_DCDC_4P2_BO)) {
380                 setbits_le32(&power_regs->hw_power_5vctrl,
381                         0x3f << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
382         } else {
383                 tmp = (readl(&power_regs->hw_power_5vctrl) &
384                         POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK) >>
385                         POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET;
386                 while (tmp < 0x3f) {
387                         if (!(readl(&power_regs->hw_power_sts) &
388                                         POWER_STS_DCDC_4P2_BO)) {
389                                 tmp = readl(&power_regs->hw_power_5vctrl);
390                                 tmp |= POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK;
391                                 early_delay(100);
392                                 writel(tmp, &power_regs->hw_power_5vctrl);
393                                 break;
394                         } else {
395                                 tmp++;
396                                 tmp2 = readl(&power_regs->hw_power_5vctrl);
397                                 tmp2 &= ~POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK;
398                                 tmp2 |= tmp <<
399                                         POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET;
400                                 writel(tmp2, &power_regs->hw_power_5vctrl);
401                                 early_delay(100);
402                         }
403                 }
404         }
406         clrbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_BO_MASK);
407         writel(POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
410 static void mxs_power_init_dcdc_4p2_source(void)
412         struct mxs_power_regs *power_regs =
413                 (struct mxs_power_regs *)MXS_POWER_BASE;
415         if (!(readl(&power_regs->hw_power_dcdc4p2) &
416                 POWER_DCDC4P2_ENABLE_DCDC)) {
417                 hang();
418         }
420         mxs_enable_4p2_dcdc_input(1);
422         if (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ) {
423                 clrbits_le32(&power_regs->hw_power_dcdc4p2,
424                         POWER_DCDC4P2_ENABLE_DCDC);
425                 writel(POWER_5VCTRL_ENABLE_DCDC,
426                         &power_regs->hw_power_5vctrl_clr);
427                 writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
428                         &power_regs->hw_power_5vctrl_set);
429         }
432 static void mxs_power_enable_4p2(void)
434         struct mxs_power_regs *power_regs =
435                 (struct mxs_power_regs *)MXS_POWER_BASE;
436         uint32_t vdddctrl, vddactrl, vddioctrl;
437         uint32_t tmp;
439         vdddctrl = readl(&power_regs->hw_power_vdddctrl);
440         vddactrl = readl(&power_regs->hw_power_vddactrl);
441         vddioctrl = readl(&power_regs->hw_power_vddioctrl);
443         setbits_le32(&power_regs->hw_power_vdddctrl,
444                 POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG |
445                 POWER_VDDDCTRL_PWDN_BRNOUT);
447         setbits_le32(&power_regs->hw_power_vddactrl,
448                 POWER_VDDACTRL_DISABLE_FET | POWER_VDDACTRL_ENABLE_LINREG |
449                 POWER_VDDACTRL_PWDN_BRNOUT);
451         setbits_le32(&power_regs->hw_power_vddioctrl,
452                 POWER_VDDIOCTRL_DISABLE_FET | POWER_VDDIOCTRL_PWDN_BRNOUT);
454         mxs_power_init_4p2_params();
455         mxs_power_init_4p2_regulator();
457         /* Shutdown battery (none present) */
458         if (!mxs_is_batt_ready()) {
459                 clrbits_le32(&power_regs->hw_power_dcdc4p2,
460                                 POWER_DCDC4P2_BO_MASK);
461                 writel(POWER_CTRL_DCDC4P2_BO_IRQ,
462                                 &power_regs->hw_power_ctrl_clr);
463                 writel(POWER_CTRL_ENIRQ_DCDC4P2_BO,
464                                 &power_regs->hw_power_ctrl_clr);
465         }
467         mxs_power_init_dcdc_4p2_source();
469         writel(vdddctrl, &power_regs->hw_power_vdddctrl);
470         early_delay(20);
471         writel(vddactrl, &power_regs->hw_power_vddactrl);
472         early_delay(20);
473         writel(vddioctrl, &power_regs->hw_power_vddioctrl);
475         /*
476          * Check if FET is enabled on either powerout and if so,
477          * disable load.
478          */
479         tmp = 0;
480         tmp |= !(readl(&power_regs->hw_power_vdddctrl) &
481                         POWER_VDDDCTRL_DISABLE_FET);
482         tmp |= !(readl(&power_regs->hw_power_vddactrl) &
483                         POWER_VDDACTRL_DISABLE_FET);
484         tmp |= !(readl(&power_regs->hw_power_vddioctrl) &
485                         POWER_VDDIOCTRL_DISABLE_FET);
486         if (tmp)
487                 writel(POWER_CHARGE_ENABLE_LOAD,
488                         &power_regs->hw_power_charge_clr);
491 static void mxs_boot_valid_5v(void)
493         struct mxs_power_regs *power_regs =
494                 (struct mxs_power_regs *)MXS_POWER_BASE;
496         /*
497          * Use VBUSVALID level instead of VDD5V_GT_VDDIO level to trigger a 5V
498          * disconnect event. FIXME
499          */
500         writel(POWER_5VCTRL_VBUSVALID_5VDETECT,
501                 &power_regs->hw_power_5vctrl_set);
503         /* Configure polarity to check for 5V disconnection. */
504         writel(POWER_CTRL_POLARITY_VBUSVALID |
505                 POWER_CTRL_POLARITY_VDD5V_GT_VDDIO,
506                 &power_regs->hw_power_ctrl_clr);
508         writel(POWER_CTRL_VBUS_VALID_IRQ | POWER_CTRL_VDD5V_GT_VDDIO_IRQ,
509                 &power_regs->hw_power_ctrl_clr);
511         mxs_power_enable_4p2();
514 static void mxs_powerdown(void)
516         struct mxs_power_regs *power_regs =
517                 (struct mxs_power_regs *)MXS_POWER_BASE;
518         writel(POWER_RESET_UNLOCK_KEY, &power_regs->hw_power_reset);
519         writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
520                 &power_regs->hw_power_reset);
523 static void mxs_batt_boot(void)
525         struct mxs_power_regs *power_regs =
526                 (struct mxs_power_regs *)MXS_POWER_BASE;
528         clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_PWDN_5VBRNOUT);
529         clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_ENABLE_DCDC);
531         clrbits_le32(&power_regs->hw_power_dcdc4p2,
532                         POWER_DCDC4P2_ENABLE_DCDC | POWER_DCDC4P2_ENABLE_4P2);
533         writel(POWER_CHARGE_ENABLE_LOAD, &power_regs->hw_power_charge_clr);
535         /* 5V to battery handoff. */
536         setbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
537         early_delay(30);
538         clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
540         writel(POWER_CTRL_ENIRQ_DCDC4P2_BO, &power_regs->hw_power_ctrl_clr);
542         clrsetbits_le32(&power_regs->hw_power_minpwr,
543                         POWER_MINPWR_HALFFETS, POWER_MINPWR_DOUBLE_FETS);
545         mxs_power_set_linreg();
547         clrbits_le32(&power_regs->hw_power_vdddctrl,
548                 POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG);
550         clrbits_le32(&power_regs->hw_power_vddactrl,
551                 POWER_VDDACTRL_DISABLE_FET | POWER_VDDACTRL_ENABLE_LINREG);
553         clrbits_le32(&power_regs->hw_power_vddioctrl,
554                 POWER_VDDIOCTRL_DISABLE_FET);
556         setbits_le32(&power_regs->hw_power_5vctrl,
557                 POWER_5VCTRL_PWD_CHARGE_4P2_MASK);
559         setbits_le32(&power_regs->hw_power_5vctrl,
560                 POWER_5VCTRL_ENABLE_DCDC);
562         clrsetbits_le32(&power_regs->hw_power_5vctrl,
563                 POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
564                 0x8 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
567 static void mxs_handle_5v_conflict(void)
569         struct mxs_power_regs *power_regs =
570                 (struct mxs_power_regs *)MXS_POWER_BASE;
571         uint32_t tmp;
573         setbits_le32(&power_regs->hw_power_vddioctrl,
574                         POWER_VDDIOCTRL_BO_OFFSET_MASK);
576         for (;;) {
577                 tmp = readl(&power_regs->hw_power_sts);
579                 if (tmp & POWER_STS_VDDIO_BO) {
580                         /*
581                          * VDDIO has a brownout, then the VDD5V_GT_VDDIO becomes
582                          * unreliable
583                          */
584                         mxs_powerdown();
585                         break;
586                 }
588                 if (tmp & POWER_STS_VDD5V_GT_VDDIO) {
589                         mxs_boot_valid_5v();
590                         break;
591                 } else {
592                         mxs_powerdown();
593                         break;
594                 }
596                 if (tmp & POWER_STS_PSWITCH_MASK) {
597                         mxs_batt_boot();
598                         break;
599                 }
600         }
603 static void mxs_5v_boot(void)
605         struct mxs_power_regs *power_regs =
606                 (struct mxs_power_regs *)MXS_POWER_BASE;
608         /*
609          * NOTE: In original IMX-Bootlets, this also checks for VBUSVALID,
610          * but their implementation always returns 1 so we omit it here.
611          */
612         if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
613                 mxs_boot_valid_5v();
614                 return;
615         }
617         early_delay(1000);
618         if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
619                 mxs_boot_valid_5v();
620                 return;
621         }
623         mxs_handle_5v_conflict();
626 static void mxs_init_batt_bo(void)
628         struct mxs_power_regs *power_regs =
629                 (struct mxs_power_regs *)MXS_POWER_BASE;
631         /* Brownout at 3V */
632         clrsetbits_le32(&power_regs->hw_power_battmonitor,
633                 POWER_BATTMONITOR_BRWNOUT_LVL_MASK,
634                 15 << POWER_BATTMONITOR_BRWNOUT_LVL_OFFSET);
636         writel(POWER_CTRL_BATT_BO_IRQ, &power_regs->hw_power_ctrl_clr);
637         writel(POWER_CTRL_ENIRQ_BATT_BO, &power_regs->hw_power_ctrl_clr);
640 static void mxs_switch_vddd_to_dcdc_source(void)
642         struct mxs_power_regs *power_regs =
643                 (struct mxs_power_regs *)MXS_POWER_BASE;
645         clrsetbits_le32(&power_regs->hw_power_vdddctrl,
646                 POWER_VDDDCTRL_LINREG_OFFSET_MASK,
647                 POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW);
649         clrbits_le32(&power_regs->hw_power_vdddctrl,
650                 POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG |
651                 POWER_VDDDCTRL_DISABLE_STEPPING);
654 static void mxs_power_configure_power_source(void)
656         int batt_ready, batt_good;
657         struct mxs_power_regs *power_regs =
658                 (struct mxs_power_regs *)MXS_POWER_BASE;
659         struct mxs_lradc_regs *lradc_regs =
660                 (struct mxs_lradc_regs *)MXS_LRADC_BASE;
662         mxs_src_power_init();
664         if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
665                 batt_ready = mxs_is_batt_ready();
666                 if (batt_ready) {
667                         /* 5V source detected, good battery detected. */
668                         mxs_batt_boot();
669                 } else {
670                         batt_good = mxs_is_batt_good();
671                         if (!batt_good) {
672                                 /* 5V source detected, bad battery detected. */
673                                 writel(LRADC_CONVERSION_AUTOMATIC,
674                                         &lradc_regs->hw_lradc_conversion_clr);
675                                 clrbits_le32(&power_regs->hw_power_battmonitor,
676                                         POWER_BATTMONITOR_BATT_VAL_MASK);
677                         }
678                         mxs_5v_boot();
679                 }
680         } else {
681                 /* 5V not detected, booting from battery. */
682                 mxs_batt_boot();
683         }
685         mxs_power_clock2pll();
687         mxs_init_batt_bo();
689         mxs_switch_vddd_to_dcdc_source();
692 static void mxs_enable_output_rail_protection(void)
694         struct mxs_power_regs *power_regs =
695                 (struct mxs_power_regs *)MXS_POWER_BASE;
697         writel(POWER_CTRL_VDDD_BO_IRQ | POWER_CTRL_VDDA_BO_IRQ |
698                 POWER_CTRL_VDDIO_BO_IRQ, &power_regs->hw_power_ctrl_clr);
700         setbits_le32(&power_regs->hw_power_vdddctrl,
701                         POWER_VDDDCTRL_PWDN_BRNOUT);
703         setbits_le32(&power_regs->hw_power_vddactrl,
704                         POWER_VDDACTRL_PWDN_BRNOUT);
706         setbits_le32(&power_regs->hw_power_vddioctrl,
707                         POWER_VDDIOCTRL_PWDN_BRNOUT);
710 static int mxs_get_vddio_power_source_off(void)
712         struct mxs_power_regs *power_regs =
713                 (struct mxs_power_regs *)MXS_POWER_BASE;
714         uint32_t tmp;
716         if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
717                 tmp = readl(&power_regs->hw_power_vddioctrl);
718                 if (tmp & POWER_VDDIOCTRL_DISABLE_FET) {
719                         if ((tmp & POWER_VDDIOCTRL_LINREG_OFFSET_MASK) ==
720                                 POWER_VDDIOCTRL_LINREG_OFFSET_0STEPS) {
721                                 return 1;
722                         }
723                 }
725                 if (!(readl(&power_regs->hw_power_5vctrl) &
726                         POWER_5VCTRL_ENABLE_DCDC)) {
727                         if ((tmp & POWER_VDDIOCTRL_LINREG_OFFSET_MASK) ==
728                                 POWER_VDDIOCTRL_LINREG_OFFSET_0STEPS) {
729                                 return 1;
730                         }
731                 }
732         }
734         return 0;
738 static int mxs_get_vddd_power_source_off(void)
740         struct mxs_power_regs *power_regs =
741                 (struct mxs_power_regs *)MXS_POWER_BASE;
742         uint32_t tmp;
744         tmp = readl(&power_regs->hw_power_vdddctrl);
745         if (tmp & POWER_VDDDCTRL_DISABLE_FET) {
746                 if ((tmp & POWER_VDDDCTRL_LINREG_OFFSET_MASK) ==
747                         POWER_VDDDCTRL_LINREG_OFFSET_0STEPS) {
748                         return 1;
749                 }
750         }
752         if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
753                 if (!(readl(&power_regs->hw_power_5vctrl) &
754                         POWER_5VCTRL_ENABLE_DCDC)) {
755                         return 1;
756                 }
757         }
759         if (!(tmp & POWER_VDDDCTRL_ENABLE_LINREG)) {
760                 if ((tmp & POWER_VDDDCTRL_LINREG_OFFSET_MASK) ==
761                         POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW) {
762                         return 1;
763                 }
764         }
766         return 0;
769 struct mxs_vddx_cfg {
770         uint32_t                *reg;
771         uint8_t                 step_mV;
772         uint16_t                lowest_mV;
773         int                     (*powered_by_linreg)(void);
774         uint32_t                trg_mask;
775         uint32_t                bo_irq;
776         uint32_t                bo_enirq;
777         uint32_t                bo_offset_mask;
778         uint32_t                bo_offset_offset;
779 };
781 static const struct mxs_vddx_cfg mxs_vddio_cfg = {
782         .reg                    = &(((struct mxs_power_regs *)MXS_POWER_BASE)->
783                                         hw_power_vddioctrl),
784         .step_mV                = 50,
785         .lowest_mV              = 2800,
786         .powered_by_linreg      = mxs_get_vddio_power_source_off,
787         .trg_mask               = POWER_VDDIOCTRL_TRG_MASK,
788         .bo_irq                 = POWER_CTRL_VDDIO_BO_IRQ,
789         .bo_enirq               = POWER_CTRL_ENIRQ_VDDIO_BO,
790         .bo_offset_mask         = POWER_VDDIOCTRL_BO_OFFSET_MASK,
791         .bo_offset_offset       = POWER_VDDIOCTRL_BO_OFFSET_OFFSET,
792 };
794 static const struct mxs_vddx_cfg mxs_vddd_cfg = {
795         .reg                    = &(((struct mxs_power_regs *)MXS_POWER_BASE)->
796                                         hw_power_vdddctrl),
797         .step_mV                = 25,
798         .lowest_mV              = 800,
799         .powered_by_linreg      = mxs_get_vddd_power_source_off,
800         .trg_mask               = POWER_VDDDCTRL_TRG_MASK,
801         .bo_irq                 = POWER_CTRL_VDDD_BO_IRQ,
802         .bo_enirq               = POWER_CTRL_ENIRQ_VDDD_BO,
803         .bo_offset_mask         = POWER_VDDDCTRL_BO_OFFSET_MASK,
804         .bo_offset_offset       = POWER_VDDDCTRL_BO_OFFSET_OFFSET,
805 };
807 static void mxs_power_set_vddx(const struct mxs_vddx_cfg *cfg,
808                                 uint32_t new_target, uint32_t new_brownout)
810         struct mxs_power_regs *power_regs =
811                 (struct mxs_power_regs *)MXS_POWER_BASE;
812         uint32_t cur_target, diff, bo_int = 0;
813         uint32_t powered_by_linreg = 0;
814         int adjust_up, tmp;
816         new_brownout = DIV_ROUND(new_target - new_brownout, cfg->step_mV);
818         cur_target = readl(cfg->reg);
819         cur_target &= cfg->trg_mask;
820         cur_target *= cfg->step_mV;
821         cur_target += cfg->lowest_mV;
823         adjust_up = new_target > cur_target;
824         powered_by_linreg = cfg->powered_by_linreg();
826         if (adjust_up) {
827                 if (powered_by_linreg) {
828                         bo_int = readl(cfg->reg);
829                         clrbits_le32(cfg->reg, cfg->bo_enirq);
830                 }
831                 setbits_le32(cfg->reg, cfg->bo_offset_mask);
832         }
834         do {
835                 if (abs(new_target - cur_target) > 100) {
836                         if (adjust_up)
837                                 diff = cur_target + 100;
838                         else
839                                 diff = cur_target - 100;
840                 } else {
841                         diff = new_target;
842                 }
844                 diff -= cfg->lowest_mV;
845                 diff /= cfg->step_mV;
847                 clrsetbits_le32(cfg->reg, cfg->trg_mask, diff);
849                 if (powered_by_linreg ||
850                         (readl(&power_regs->hw_power_sts) &
851                                 POWER_STS_VDD5V_GT_VDDIO))
852                         early_delay(500);
853                 else {
854                         for (;;) {
855                                 tmp = readl(&power_regs->hw_power_sts);
856                                 if (tmp & POWER_STS_DC_OK)
857                                         break;
858                         }
859                 }
861                 cur_target = readl(cfg->reg);
862                 cur_target &= cfg->trg_mask;
863                 cur_target *= cfg->step_mV;
864                 cur_target += cfg->lowest_mV;
865         } while (new_target > cur_target);
867         if (adjust_up && powered_by_linreg) {
868                 writel(cfg->bo_irq, &power_regs->hw_power_ctrl_clr);
869                 if (bo_int & cfg->bo_enirq)
870                         setbits_le32(cfg->reg, cfg->bo_enirq);
871         }
873         clrsetbits_le32(cfg->reg, cfg->bo_offset_mask,
874                         new_brownout << cfg->bo_offset_offset);
877 static void mxs_setup_batt_detect(void)
879         mxs_lradc_init();
880         mxs_lradc_enable_batt_measurement();
881         early_delay(10);
884 void mxs_power_init(void)
886         struct mxs_power_regs *power_regs =
887                 (struct mxs_power_regs *)MXS_POWER_BASE;
889         mxs_power_clock2xtal();
890         mxs_power_clear_auto_restart();
891         mxs_power_set_linreg();
892         mxs_power_setup_5v_detect();
894         mxs_setup_batt_detect();
896         mxs_power_configure_power_source();
897         mxs_enable_output_rail_protection();
899         mxs_power_set_vddx(&mxs_vddio_cfg, 3300, 3150);
900         mxs_power_set_vddx(&mxs_vddd_cfg, 1500, 1000);
902         writel(POWER_CTRL_VDDD_BO_IRQ | POWER_CTRL_VDDA_BO_IRQ |
903                 POWER_CTRL_VDDIO_BO_IRQ | POWER_CTRL_VDD5V_DROOP_IRQ |
904                 POWER_CTRL_VBUS_VALID_IRQ | POWER_CTRL_BATT_BO_IRQ |
905                 POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
907         writel(POWER_5VCTRL_PWDN_5VBRNOUT, &power_regs->hw_power_5vctrl_set);
909         early_delay(1000);
912 #ifdef  CONFIG_SPL_MX28_PSWITCH_WAIT
913 void mxs_power_wait_pswitch(void)
915         struct mxs_power_regs *power_regs =
916                 (struct mxs_power_regs *)MXS_POWER_BASE;
918         while (!(readl(&power_regs->hw_power_sts) & POWER_STS_PSWITCH_MASK))
919                 ;
921 #endif