common: Drop linux/delay.h from common header
[oweals/u-boot.git] / board / freescale / common / vid.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2014 Freescale Semiconductor, Inc.
4  */
5
6 #include <common.h>
7 #include <command.h>
8 #include <env.h>
9 #include <i2c.h>
10 #include <irq_func.h>
11 #include <log.h>
12 #include <asm/io.h>
13 #ifdef CONFIG_FSL_LSCH2
14 #include <asm/arch/immap_lsch2.h>
15 #elif defined(CONFIG_FSL_LSCH3)
16 #include <asm/arch/immap_lsch3.h>
17 #else
18 #include <asm/immap_85xx.h>
19 #endif
20 #include <linux/delay.h>
21 #include "vid.h"
22
23 int __weak i2c_multiplexer_select_vid_channel(u8 channel)
24 {
25         return 0;
26 }
27
28 /*
29  * Compensate for a board specific voltage drop between regulator and SoC
30  * return a value in mV
31  */
32 int __weak board_vdd_drop_compensation(void)
33 {
34         return 0;
35 }
36
37 /*
38  * Board specific settings for specific voltage value
39  */
40 int __weak board_adjust_vdd(int vdd)
41 {
42         return 0;
43 }
44
45 #if defined(CONFIG_VOL_MONITOR_IR36021_SET) || \
46         defined(CONFIG_VOL_MONITOR_IR36021_READ)
47 /*
48  * Get the i2c address configuration for the IR regulator chip
49  *
50  * There are some variance in the RDB HW regarding the I2C address configuration
51  * for the IR regulator chip, which is likely a problem of external resistor
52  * accuracy. So we just check each address in a hopefully non-intrusive mode
53  * and use the first one that seems to work
54  *
55  * The IR chip can show up under the following addresses:
56  * 0x08 (Verified on T1040RDB-PA,T4240RDB-PB,X-T4240RDB-16GPA)
57  * 0x09 (Verified on T1040RDB-PA)
58  * 0x38 (Verified on T2080QDS, T2081QDS, T4240RDB)
59  */
60 static int find_ir_chip_on_i2c(void)
61 {
62         int i2caddress;
63         int ret;
64         u8 byte;
65         int i;
66         const int ir_i2c_addr[] = {0x38, 0x08, 0x09};
67 #ifdef CONFIG_DM_I2C
68         struct udevice *dev;
69 #endif
70
71         /* Check all the address */
72         for (i = 0; i < (sizeof(ir_i2c_addr)/sizeof(ir_i2c_addr[0])); i++) {
73                 i2caddress = ir_i2c_addr[i];
74 #ifndef CONFIG_DM_I2C
75                 ret = i2c_read(i2caddress,
76                                IR36021_MFR_ID_OFFSET, 1, (void *)&byte,
77                                sizeof(byte));
78 #else
79                 ret = i2c_get_chip_for_busnum(0, i2caddress, 1, &dev);
80                 if (!ret)
81                         ret = dm_i2c_read(dev, IR36021_MFR_ID_OFFSET,
82                                           (void *)&byte, sizeof(byte));
83 #endif
84                 if ((ret >= 0) && (byte == IR36021_MFR_ID))
85                         return i2caddress;
86         }
87         return -1;
88 }
89 #endif
90
91 /* Maximum loop count waiting for new voltage to take effect */
92 #define MAX_LOOP_WAIT_NEW_VOL           100
93 /* Maximum loop count waiting for the voltage to be stable */
94 #define MAX_LOOP_WAIT_VOL_STABLE        100
95 /*
96  * read_voltage from sensor on I2C bus
97  * We use average of 4 readings, waiting for WAIT_FOR_ADC before
98  * another reading
99  */
100 #define NUM_READINGS    4       /* prefer to be power of 2 for efficiency */
101
102 /* If an INA220 chip is available, we can use it to read back the voltage
103  * as it may have a higher accuracy than the IR chip for the same purpose
104  */
105 #ifdef CONFIG_VOL_MONITOR_INA220
106 #define WAIT_FOR_ADC    532     /* wait for 532 microseconds for ADC */
107 #define ADC_MIN_ACCURACY        4
108 #else
109 #define WAIT_FOR_ADC    138     /* wait for 138 microseconds for ADC */
110 #define ADC_MIN_ACCURACY        4
111 #endif
112
113 #ifdef CONFIG_VOL_MONITOR_INA220
114 static int read_voltage_from_INA220(int i2caddress)
115 {
116         int i, ret, voltage_read = 0;
117         u16 vol_mon;
118         u8 buf[2];
119 #ifdef CONFIG_DM_I2C
120         struct udevice *dev;
121 #endif
122
123         for (i = 0; i < NUM_READINGS; i++) {
124 #ifndef CONFIG_DM_I2C
125                 ret = i2c_read(I2C_VOL_MONITOR_ADDR,
126                                I2C_VOL_MONITOR_BUS_V_OFFSET, 1,
127                                (void *)&buf, 2);
128 #else
129                 ret = i2c_get_chip_for_busnum(0, I2C_VOL_MONITOR_ADDR, 1, &dev);
130                 if (!ret)
131                         ret = dm_i2c_read(dev, I2C_VOL_MONITOR_BUS_V_OFFSET,
132                                           (void *)&buf, 2);
133 #endif
134                 if (ret) {
135                         printf("VID: failed to read core voltage\n");
136                         return ret;
137                 }
138                 vol_mon = (buf[0] << 8) | buf[1];
139                 if (vol_mon & I2C_VOL_MONITOR_BUS_V_OVF) {
140                         printf("VID: Core voltage sensor error\n");
141                         return -1;
142                 }
143                 debug("VID: bus voltage reads 0x%04x\n", vol_mon);
144                 /* LSB = 4mv */
145                 voltage_read += (vol_mon >> I2C_VOL_MONITOR_BUS_V_SHIFT) * 4;
146                 udelay(WAIT_FOR_ADC);
147         }
148         /* calculate the average */
149         voltage_read /= NUM_READINGS;
150
151         return voltage_read;
152 }
153 #endif
154
155 /* read voltage from IR */
156 #ifdef CONFIG_VOL_MONITOR_IR36021_READ
157 static int read_voltage_from_IR(int i2caddress)
158 {
159         int i, ret, voltage_read = 0;
160         u16 vol_mon;
161         u8 buf;
162 #ifdef CONFIG_DM_I2C
163         struct udevice *dev;
164 #endif
165
166         for (i = 0; i < NUM_READINGS; i++) {
167 #ifndef CONFIG_DM_I2C
168                 ret = i2c_read(i2caddress,
169                                IR36021_LOOP1_VOUT_OFFSET,
170                                1, (void *)&buf, 1);
171 #else
172                 ret = i2c_get_chip_for_busnum(0, i2caddress, 1, &dev);
173                 if (!ret)
174                         ret = dm_i2c_read(dev, IR36021_LOOP1_VOUT_OFFSET,
175                                           (void *)&buf, 1);
176 #endif
177                 if (ret) {
178                         printf("VID: failed to read vcpu\n");
179                         return ret;
180                 }
181                 vol_mon = buf;
182                 if (!vol_mon) {
183                         printf("VID: Core voltage sensor error\n");
184                         return -1;
185                 }
186                 debug("VID: bus voltage reads 0x%02x\n", vol_mon);
187                 /* Resolution is 1/128V. We scale up here to get 1/128mV
188                  * and divide at the end
189                  */
190                 voltage_read += vol_mon * 1000;
191                 udelay(WAIT_FOR_ADC);
192         }
193         /* Scale down to the real mV as IR resolution is 1/128V, rounding up */
194         voltage_read = DIV_ROUND_UP(voltage_read, 128);
195
196         /* calculate the average */
197         voltage_read /= NUM_READINGS;
198
199         /* Compensate for a board specific voltage drop between regulator and
200          * SoC before converting into an IR VID value
201          */
202         voltage_read -= board_vdd_drop_compensation();
203
204         return voltage_read;
205 }
206 #endif
207
208 #ifdef CONFIG_VOL_MONITOR_LTC3882_READ
209 /* read the current value of the LTC Regulator Voltage */
210 static int read_voltage_from_LTC(int i2caddress)
211 {
212         int  ret, vcode = 0;
213         u8 chan = PWM_CHANNEL0;
214
215 #ifndef CONFIG_DM_I2C
216         /* select the PAGE 0 using PMBus commands PAGE for VDD*/
217         ret = i2c_write(I2C_VOL_MONITOR_ADDR,
218                         PMBUS_CMD_PAGE, 1, &chan, 1);
219 #else
220         struct udevice *dev;
221
222         ret = i2c_get_chip_for_busnum(0, I2C_VOL_MONITOR_ADDR, 1, &dev);
223         if (!ret)
224                 ret = dm_i2c_write(dev, PMBUS_CMD_PAGE, &chan, 1);
225 #endif
226         if (ret) {
227                 printf("VID: failed to select VDD Page 0\n");
228                 return ret;
229         }
230
231 #ifndef CONFIG_DM_I2C
232         /*read the output voltage using PMBus command READ_VOUT*/
233         ret = i2c_read(I2C_VOL_MONITOR_ADDR,
234                        PMBUS_CMD_READ_VOUT, 1, (void *)&vcode, 2);
235 #else
236         ret = dm_i2c_read(dev, PMBUS_CMD_READ_VOUT, (void *)&vcode, 2);
237         if (ret) {
238                 printf("VID: failed to read the volatge\n");
239                 return ret;
240         }
241 #endif
242         if (ret) {
243                 printf("VID: failed to read the volatge\n");
244                 return ret;
245         }
246
247         /* Scale down to the real mV as LTC resolution is 1/4096V,rounding up */
248         vcode = DIV_ROUND_UP(vcode * 1000, 4096);
249
250         return vcode;
251 }
252 #endif
253
254 static int read_voltage(int i2caddress)
255 {
256         int voltage_read;
257 #ifdef CONFIG_VOL_MONITOR_INA220
258         voltage_read = read_voltage_from_INA220(i2caddress);
259 #elif defined CONFIG_VOL_MONITOR_IR36021_READ
260         voltage_read = read_voltage_from_IR(i2caddress);
261 #elif defined CONFIG_VOL_MONITOR_LTC3882_READ
262         voltage_read = read_voltage_from_LTC(i2caddress);
263 #else
264         return -1;
265 #endif
266         return voltage_read;
267 }
268
269 #ifdef CONFIG_VOL_MONITOR_IR36021_SET
270 /*
271  * We need to calculate how long before the voltage stops to drop
272  * or increase. It returns with the loop count. Each loop takes
273  * several readings (WAIT_FOR_ADC)
274  */
275 static int wait_for_new_voltage(int vdd, int i2caddress)
276 {
277         int timeout, vdd_current;
278
279         vdd_current = read_voltage(i2caddress);
280         /* wait until voltage starts to reach the target. Voltage slew
281          * rates by typical regulators will always lead to stable readings
282          * within each fairly long ADC interval in comparison to the
283          * intended voltage delta change until the target voltage is
284          * reached. The fairly small voltage delta change to any target
285          * VID voltage also means that this function will always complete
286          * within few iterations. If the timeout was ever reached, it would
287          * point to a serious failure in the regulator system.
288          */
289         for (timeout = 0;
290              abs(vdd - vdd_current) > (IR_VDD_STEP_UP + IR_VDD_STEP_DOWN) &&
291              timeout < MAX_LOOP_WAIT_NEW_VOL; timeout++) {
292                 vdd_current = read_voltage(i2caddress);
293         }
294         if (timeout >= MAX_LOOP_WAIT_NEW_VOL) {
295                 printf("VID: Voltage adjustment timeout\n");
296                 return -1;
297         }
298         return timeout;
299 }
300
301 /*
302  * this function keeps reading the voltage until it is stable or until the
303  * timeout expires
304  */
305 static int wait_for_voltage_stable(int i2caddress)
306 {
307         int timeout, vdd_current, vdd;
308
309         vdd = read_voltage(i2caddress);
310         udelay(NUM_READINGS * WAIT_FOR_ADC);
311
312         /* wait until voltage is stable */
313         vdd_current = read_voltage(i2caddress);
314         /* The maximum timeout is
315          * MAX_LOOP_WAIT_VOL_STABLE * NUM_READINGS * WAIT_FOR_ADC
316          */
317         for (timeout = MAX_LOOP_WAIT_VOL_STABLE;
318              abs(vdd - vdd_current) > ADC_MIN_ACCURACY &&
319              timeout > 0; timeout--) {
320                 vdd = vdd_current;
321                 udelay(NUM_READINGS * WAIT_FOR_ADC);
322                 vdd_current = read_voltage(i2caddress);
323         }
324         if (timeout == 0)
325                 return -1;
326         return vdd_current;
327 }
328
329 /* Set the voltage to the IR chip */
330 static int set_voltage_to_IR(int i2caddress, int vdd)
331 {
332         int wait, vdd_last;
333         int ret;
334         u8 vid;
335
336         /* Compensate for a board specific voltage drop between regulator and
337          * SoC before converting into an IR VID value
338          */
339         vdd += board_vdd_drop_compensation();
340 #ifdef CONFIG_FSL_LSCH2
341         vid = DIV_ROUND_UP(vdd - 265, 5);
342 #else
343         vid = DIV_ROUND_UP(vdd - 245, 5);
344 #endif
345
346 #ifndef CONFIG_DM_I2C
347         ret = i2c_write(i2caddress, IR36021_LOOP1_MANUAL_ID_OFFSET,
348                         1, (void *)&vid, sizeof(vid));
349 #else
350         struct udevice *dev;
351
352         ret = i2c_get_chip_for_busnum(0, i2caddress, 1, &dev);
353         if (!ret)
354                 ret = dm_i2c_write(dev, IR36021_LOOP1_MANUAL_ID_OFFSET,
355                                    (void *)&vid, sizeof(vid));
356
357 #endif
358         if (ret) {
359                 printf("VID: failed to write VID\n");
360                 return -1;
361         }
362         wait = wait_for_new_voltage(vdd, i2caddress);
363         if (wait < 0)
364                 return -1;
365         debug("VID: Waited %d us\n", wait * NUM_READINGS * WAIT_FOR_ADC);
366
367         vdd_last = wait_for_voltage_stable(i2caddress);
368         if (vdd_last < 0)
369                 return -1;
370         debug("VID: Current voltage is %d mV\n", vdd_last);
371         return vdd_last;
372 }
373
374 #endif
375
376 #ifdef CONFIG_VOL_MONITOR_LTC3882_SET
377 /* this function sets the VDD and returns the value set */
378 static int set_voltage_to_LTC(int i2caddress, int vdd)
379 {
380         int ret, vdd_last, vdd_target = vdd;
381         int count = 100, temp = 0;
382
383         /* Scale up to the LTC resolution is 1/4096V */
384         vdd = (vdd * 4096) / 1000;
385
386         /* 5-byte buffer which needs to be sent following the
387          * PMBus command PAGE_PLUS_WRITE.
388          */
389         u8 buff[5] = {0x04, PWM_CHANNEL0, PMBUS_CMD_VOUT_COMMAND,
390                         vdd & 0xFF, (vdd & 0xFF00) >> 8};
391
392         /* Write the desired voltage code to the regulator */
393 #ifndef CONFIG_DM_I2C
394         ret = i2c_write(I2C_VOL_MONITOR_ADDR,
395                         PMBUS_CMD_PAGE_PLUS_WRITE, 1, (void *)&buff, 5);
396 #else
397         struct udevice *dev;
398
399         ret = i2c_get_chip_for_busnum(0, I2C_VOL_MONITOR_ADDR, 1, &dev);
400         if (!ret)
401                 ret = dm_i2c_write(dev, PMBUS_CMD_PAGE_PLUS_WRITE,
402                                    (void *)&buff, 5);
403 #endif
404         if (ret) {
405                 printf("VID: I2C failed to write to the volatge regulator\n");
406                 return -1;
407         }
408
409         /* Wait for the volatge to get to the desired value */
410         do {
411                 vdd_last = read_voltage_from_LTC(i2caddress);
412                 if (vdd_last < 0) {
413                         printf("VID: Couldn't read sensor abort VID adjust\n");
414                         return -1;
415                 }
416                 count--;
417                 temp = vdd_last - vdd_target;
418         } while ((abs(temp) > 2)  && (count > 0));
419
420         return vdd_last;
421 }
422 #endif
423
424 static int set_voltage(int i2caddress, int vdd)
425 {
426         int vdd_last = -1;
427
428 #ifdef CONFIG_VOL_MONITOR_IR36021_SET
429         vdd_last = set_voltage_to_IR(i2caddress, vdd);
430 #elif defined CONFIG_VOL_MONITOR_LTC3882_SET
431         vdd_last = set_voltage_to_LTC(i2caddress, vdd);
432 #else
433         #error Specific voltage monitor must be defined
434 #endif
435         return vdd_last;
436 }
437
438 #ifdef CONFIG_FSL_LSCH3
439 int adjust_vdd(ulong vdd_override)
440 {
441         int re_enable = disable_interrupts();
442         struct ccsr_gur *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
443         u32 fusesr;
444 #if defined(CONFIG_VOL_MONITOR_IR36021_SET) || \
445         defined(CONFIG_VOL_MONITOR_IR36021_READ)
446         u8 vid, buf;
447 #else
448         u8 vid;
449 #endif
450         int vdd_target, vdd_current, vdd_last;
451         int ret, i2caddress;
452         unsigned long vdd_string_override;
453         char *vdd_string;
454 #ifdef CONFIG_ARCH_LX2160A
455         static const u16 vdd[32] = {
456                 8250,
457                 7875,
458                 7750,
459                 0,      /* reserved */
460                 0,      /* reserved */
461                 0,      /* reserved */
462                 0,      /* reserved */
463                 0,      /* reserved */
464                 0,      /* reserved */
465                 0,      /* reserved */
466                 0,      /* reserved */
467                 0,      /* reserved */
468                 0,      /* reserved */
469                 0,      /* reserved */
470                 0,      /* reserved */
471                 0,      /* reserved */
472                 8000,
473                 8125,
474                 8250,
475                 0,      /* reserved */
476                 8500,
477                 0,      /* reserved */
478                 0,      /* reserved */
479                 0,      /* reserved */
480                 0,      /* reserved */
481                 0,      /* reserved */
482                 0,      /* reserved */
483                 0,      /* reserved */
484                 0,      /* reserved */
485                 0,      /* reserved */
486                 0,      /* reserved */
487                 0,      /* reserved */
488         };
489 #else
490 #ifdef CONFIG_ARCH_LS1088A
491         static const uint16_t vdd[32] = {
492                 10250,
493                 9875,
494                 9750,
495                 0,      /* reserved */
496                 0,      /* reserved */
497                 0,      /* reserved */
498                 0,      /* reserved */
499                 0,      /* reserved */
500                 9000,
501                 0,      /* reserved */
502                 0,      /* reserved */
503                 0,      /* reserved */
504                 0,      /* reserved */
505                 0,      /* reserved */
506                 0,      /* reserved */
507                 0,      /* reserved */
508                 10000,  /* 1.0000V */
509                 10125,
510                 10250,
511                 0,      /* reserved */
512                 0,      /* reserved */
513                 0,      /* reserved */
514                 0,      /* reserved */
515                 0,      /* reserved */
516                 0,      /* reserved */
517                 0,      /* reserved */
518                 0,      /* reserved */
519                 0,      /* reserved */
520                 0,      /* reserved */
521                 0,      /* reserved */
522                 0,      /* reserved */
523                 0,      /* reserved */
524         };
525
526 #else
527         static const uint16_t vdd[32] = {
528                 10500,
529                 0,      /* reserved */
530                 9750,
531                 0,      /* reserved */
532                 9500,
533                 0,      /* reserved */
534                 0,      /* reserved */
535                 0,      /* reserved */
536                 0,      /* reserved */
537                 0,      /* reserved */
538                 0,      /* reserved */
539                 9000,      /* reserved */
540                 0,      /* reserved */
541                 0,      /* reserved */
542                 0,      /* reserved */
543                 0,      /* reserved */
544                 10000,  /* 1.0000V */
545                 0,      /* reserved */
546                 10250,
547                 0,      /* reserved */
548                 10500,
549                 0,      /* reserved */
550                 0,      /* reserved */
551                 0,      /* reserved */
552                 0,      /* reserved */
553                 0,      /* reserved */
554                 0,      /* reserved */
555                 0,      /* reserved */
556                 0,      /* reserved */
557                 0,      /* reserved */
558                 0,      /* reserved */
559                 0,      /* reserved */
560         };
561 #endif
562 #endif
563         struct vdd_drive {
564                 u8 vid;
565                 unsigned voltage;
566         };
567
568         ret = i2c_multiplexer_select_vid_channel(I2C_MUX_CH_VOL_MONITOR);
569         if (ret) {
570                 debug("VID: I2C failed to switch channel\n");
571                 ret = -1;
572                 goto exit;
573         }
574 #if defined(CONFIG_VOL_MONITOR_IR36021_SET) || \
575         defined(CONFIG_VOL_MONITOR_IR36021_READ)
576         ret = find_ir_chip_on_i2c();
577         if (ret < 0) {
578                 printf("VID: Could not find voltage regulator on I2C.\n");
579                 ret = -1;
580                 goto exit;
581         } else {
582                 i2caddress = ret;
583                 debug("VID: IR Chip found on I2C address 0x%02x\n", i2caddress);
584         }
585
586         /* check IR chip work on Intel mode*/
587 #ifndef CONFIG_DM_I2C
588         ret = i2c_read(i2caddress,
589                        IR36021_INTEL_MODE_OOFSET,
590                        1, (void *)&buf, 1);
591 #else
592         struct udevice *dev;
593
594         ret = i2c_get_chip_for_busnum(0, i2caddress, 1, &dev);
595         if (!ret)
596                 ret = dm_i2c_read(dev, IR36021_INTEL_MODE_OOFSET,
597                                   (void *)&buf, 1);
598 #endif
599         if (ret) {
600                 printf("VID: failed to read IR chip mode.\n");
601                 ret = -1;
602                 goto exit;
603         }
604
605         if ((buf & IR36021_MODE_MASK) != IR36021_INTEL_MODE) {
606                 printf("VID: IR Chip is not used in Intel mode.\n");
607                 ret = -1;
608                 goto exit;
609         }
610 #endif
611
612         /* get the voltage ID from fuse status register */
613         fusesr = in_le32(&gur->dcfg_fusesr);
614         vid = (fusesr >> FSL_CHASSIS3_DCFG_FUSESR_ALTVID_SHIFT) &
615                 FSL_CHASSIS3_DCFG_FUSESR_ALTVID_MASK;
616         if ((vid == 0) || (vid == FSL_CHASSIS3_DCFG_FUSESR_ALTVID_MASK)) {
617                 vid = (fusesr >> FSL_CHASSIS3_DCFG_FUSESR_VID_SHIFT) &
618                         FSL_CHASSIS3_DCFG_FUSESR_VID_MASK;
619         }
620         vdd_target = vdd[vid];
621
622         /* check override variable for overriding VDD */
623         vdd_string = env_get(CONFIG_VID_FLS_ENV);
624         if (vdd_override == 0 && vdd_string &&
625             !strict_strtoul(vdd_string, 10, &vdd_string_override))
626                 vdd_override = vdd_string_override;
627
628         if (vdd_override >= VDD_MV_MIN && vdd_override <= VDD_MV_MAX) {
629                 vdd_target = vdd_override * 10; /* convert to 1/10 mV */
630                 debug("VDD override is %lu\n", vdd_override);
631         } else if (vdd_override != 0) {
632                 printf("Invalid value.\n");
633         }
634
635         /* divide and round up by 10 to get a value in mV */
636         vdd_target = DIV_ROUND_UP(vdd_target, 10);
637         if (vdd_target == 0) {
638                 debug("VID: VID not used\n");
639                 ret = 0;
640                 goto exit;
641         } else if (vdd_target < VDD_MV_MIN || vdd_target > VDD_MV_MAX) {
642                 /* Check vdd_target is in valid range */
643                 printf("VID: Target VID %d mV is not in range.\n",
644                        vdd_target);
645                 ret = -1;
646                 goto exit;
647         } else {
648                 debug("VID: vid = %d mV\n", vdd_target);
649         }
650
651         /*
652          * Read voltage monitor to check real voltage.
653          */
654         vdd_last = read_voltage(i2caddress);
655         if (vdd_last < 0) {
656                 printf("VID: Couldn't read sensor abort VID adjustment\n");
657                 ret = -1;
658                 goto exit;
659         }
660         vdd_current = vdd_last;
661         debug("VID: Core voltage is currently at %d mV\n", vdd_last);
662
663 #ifdef CONFIG_VOL_MONITOR_LTC3882_SET
664         /* Set the target voltage */
665         vdd_last = vdd_current = set_voltage(i2caddress, vdd_target);
666 #else
667         /*
668           * Adjust voltage to at or one step above target.
669           * As measurements are less precise than setting the values
670           * we may run through dummy steps that cancel each other
671           * when stepping up and then down.
672           */
673         while (vdd_last > 0 &&
674                vdd_last < vdd_target) {
675                 vdd_current += IR_VDD_STEP_UP;
676                 vdd_last = set_voltage(i2caddress, vdd_current);
677         }
678         while (vdd_last > 0 &&
679                vdd_last > vdd_target + (IR_VDD_STEP_DOWN - 1)) {
680                 vdd_current -= IR_VDD_STEP_DOWN;
681                 vdd_last = set_voltage(i2caddress, vdd_current);
682         }
683
684 #endif
685         if (board_adjust_vdd(vdd_target) < 0) {
686                 ret = -1;
687                 goto exit;
688         }
689
690         if (vdd_last > 0)
691                 printf("VID: Core voltage after adjustment is at %d mV\n",
692                        vdd_last);
693         else
694                 ret = -1;
695 exit:
696         if (re_enable)
697                 enable_interrupts();
698         i2c_multiplexer_select_vid_channel(I2C_MUX_CH_DEFAULT);
699         return ret;
700 }
701 #else /* !CONFIG_FSL_LSCH3 */
702 int adjust_vdd(ulong vdd_override)
703 {
704         int re_enable = disable_interrupts();
705 #if defined(CONFIG_FSL_LSCH2)
706         struct ccsr_gur *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
707 #else
708         ccsr_gur_t __iomem *gur =
709                 (void __iomem *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
710 #endif
711         u32 fusesr;
712         u8 vid, buf;
713         int vdd_target, vdd_current, vdd_last;
714         int ret, i2caddress;
715         unsigned long vdd_string_override;
716         char *vdd_string;
717         static const uint16_t vdd[32] = {
718                 0,      /* unused */
719                 9875,   /* 0.9875V */
720                 9750,
721                 9625,
722                 9500,
723                 9375,
724                 9250,
725                 9125,
726                 9000,
727                 8875,
728                 8750,
729                 8625,
730                 8500,
731                 8375,
732                 8250,
733                 8125,
734                 10000,  /* 1.0000V */
735                 10125,
736                 10250,
737                 10375,
738                 10500,
739                 10625,
740                 10750,
741                 10875,
742                 11000,
743                 0,      /* reserved */
744         };
745         struct vdd_drive {
746                 u8 vid;
747                 unsigned voltage;
748         };
749
750         ret = i2c_multiplexer_select_vid_channel(I2C_MUX_CH_VOL_MONITOR);
751         if (ret) {
752                 debug("VID: I2C failed to switch channel\n");
753                 ret = -1;
754                 goto exit;
755         }
756 #if defined(CONFIG_VOL_MONITOR_IR36021_SET) || \
757         defined(CONFIG_VOL_MONITOR_IR36021_READ)
758         ret = find_ir_chip_on_i2c();
759         if (ret < 0) {
760                 printf("VID: Could not find voltage regulator on I2C.\n");
761                 ret = -1;
762                 goto exit;
763         } else {
764                 i2caddress = ret;
765                 debug("VID: IR Chip found on I2C address 0x%02x\n", i2caddress);
766         }
767
768         /* check IR chip work on Intel mode*/
769 #ifndef CONFIG_DM_I2C
770         ret = i2c_read(i2caddress,
771                        IR36021_INTEL_MODE_OOFSET,
772                        1, (void *)&buf, 1);
773 #else
774         struct udevice *dev;
775
776         ret = i2c_get_chip_for_busnum(0, i2caddress, 1, &dev);
777         if (!ret)
778                 ret = dm_i2c_read(dev, IR36021_INTEL_MODE_OOFSET,
779                                   (void *)&buf, 1);
780 #endif
781         if (ret) {
782                 printf("VID: failed to read IR chip mode.\n");
783                 ret = -1;
784                 goto exit;
785         }
786         if ((buf & IR36021_MODE_MASK) != IR36021_INTEL_MODE) {
787                 printf("VID: IR Chip is not used in Intel mode.\n");
788                 ret = -1;
789                 goto exit;
790         }
791 #endif
792
793         /* get the voltage ID from fuse status register */
794         fusesr = in_be32(&gur->dcfg_fusesr);
795         /*
796          * VID is used according to the table below
797          *                ---------------------------------------
798          *                |                DA_V                 |
799          *                |-------------------------------------|
800          *                | 5b00000 | 5b00001-5b11110 | 5b11111 |
801          * ---------------+---------+-----------------+---------|
802          * | D | 5b00000  | NO VID  | VID = DA_V      | NO VID  |
803          * | A |----------+---------+-----------------+---------|
804          * | _ | 5b00001  |VID =    | VID =           |VID =    |
805          * | V |   ~      | DA_V_ALT|   DA_V_ALT      | DA_A_VLT|
806          * | _ | 5b11110  |         |                 |         |
807          * | A |----------+---------+-----------------+---------|
808          * | L | 5b11111  | No VID  | VID = DA_V      | NO VID  |
809          * | T |          |         |                 |         |
810          * ------------------------------------------------------
811          */
812 #ifdef CONFIG_FSL_LSCH2
813         vid = (fusesr >> FSL_CHASSIS2_DCFG_FUSESR_ALTVID_SHIFT) &
814                 FSL_CHASSIS2_DCFG_FUSESR_ALTVID_MASK;
815         if ((vid == 0) || (vid == FSL_CHASSIS2_DCFG_FUSESR_ALTVID_MASK)) {
816                 vid = (fusesr >> FSL_CHASSIS2_DCFG_FUSESR_VID_SHIFT) &
817                         FSL_CHASSIS2_DCFG_FUSESR_VID_MASK;
818         }
819 #else
820         vid = (fusesr >> FSL_CORENET_DCFG_FUSESR_ALTVID_SHIFT) &
821                 FSL_CORENET_DCFG_FUSESR_ALTVID_MASK;
822         if ((vid == 0) || (vid == FSL_CORENET_DCFG_FUSESR_ALTVID_MASK)) {
823                 vid = (fusesr >> FSL_CORENET_DCFG_FUSESR_VID_SHIFT) &
824                         FSL_CORENET_DCFG_FUSESR_VID_MASK;
825         }
826 #endif
827         vdd_target = vdd[vid];
828
829         /* check override variable for overriding VDD */
830         vdd_string = env_get(CONFIG_VID_FLS_ENV);
831         if (vdd_override == 0 && vdd_string &&
832             !strict_strtoul(vdd_string, 10, &vdd_string_override))
833                 vdd_override = vdd_string_override;
834         if (vdd_override >= VDD_MV_MIN && vdd_override <= VDD_MV_MAX) {
835                 vdd_target = vdd_override * 10; /* convert to 1/10 mV */
836                 debug("VDD override is %lu\n", vdd_override);
837         } else if (vdd_override != 0) {
838                 printf("Invalid value.\n");
839         }
840         if (vdd_target == 0) {
841                 debug("VID: VID not used\n");
842                 ret = 0;
843                 goto exit;
844         } else {
845                 /* divide and round up by 10 to get a value in mV */
846                 vdd_target = DIV_ROUND_UP(vdd_target, 10);
847                 debug("VID: vid = %d mV\n", vdd_target);
848         }
849
850         /*
851          * Read voltage monitor to check real voltage.
852          */
853         vdd_last = read_voltage(i2caddress);
854         if (vdd_last < 0) {
855                 printf("VID: Couldn't read sensor abort VID adjustment\n");
856                 ret = -1;
857                 goto exit;
858         }
859         vdd_current = vdd_last;
860         debug("VID: Core voltage is currently at %d mV\n", vdd_last);
861         /*
862           * Adjust voltage to at or one step above target.
863           * As measurements are less precise than setting the values
864           * we may run through dummy steps that cancel each other
865           * when stepping up and then down.
866           */
867         while (vdd_last > 0 &&
868                vdd_last < vdd_target) {
869                 vdd_current += IR_VDD_STEP_UP;
870                 vdd_last = set_voltage(i2caddress, vdd_current);
871         }
872         while (vdd_last > 0 &&
873                vdd_last > vdd_target + (IR_VDD_STEP_DOWN - 1)) {
874                 vdd_current -= IR_VDD_STEP_DOWN;
875                 vdd_last = set_voltage(i2caddress, vdd_current);
876         }
877
878         if (vdd_last > 0)
879                 printf("VID: Core voltage after adjustment is at %d mV\n",
880                        vdd_last);
881         else
882                 ret = -1;
883 exit:
884         if (re_enable)
885                 enable_interrupts();
886
887         i2c_multiplexer_select_vid_channel(I2C_MUX_CH_DEFAULT);
888
889         return ret;
890 }
891 #endif
892
893 static int print_vdd(void)
894 {
895         int vdd_last, ret, i2caddress;
896
897         ret = i2c_multiplexer_select_vid_channel(I2C_MUX_CH_VOL_MONITOR);
898         if (ret) {
899                 debug("VID : I2c failed to switch channel\n");
900                 return -1;
901         }
902 #if defined(CONFIG_VOL_MONITOR_IR36021_SET) || \
903         defined(CONFIG_VOL_MONITOR_IR36021_READ)
904         ret = find_ir_chip_on_i2c();
905         if (ret < 0) {
906                 printf("VID: Could not find voltage regulator on I2C.\n");
907                 goto exit;
908         } else {
909                 i2caddress = ret;
910                 debug("VID: IR Chip found on I2C address 0x%02x\n", i2caddress);
911         }
912 #endif
913
914         /*
915          * Read voltage monitor to check real voltage.
916          */
917         vdd_last = read_voltage(i2caddress);
918         if (vdd_last < 0) {
919                 printf("VID: Couldn't read sensor abort VID adjustment\n");
920                 goto exit;
921         }
922         printf("VID: Core voltage is at %d mV\n", vdd_last);
923 exit:
924         i2c_multiplexer_select_vid_channel(I2C_MUX_CH_DEFAULT);
925
926         return ret < 0 ? -1 : 0;
927
928 }
929
930 static int do_vdd_override(struct cmd_tbl *cmdtp,
931                            int flag, int argc,
932                            char *const argv[])
933 {
934         ulong override;
935
936         if (argc < 2)
937                 return CMD_RET_USAGE;
938
939         if (!strict_strtoul(argv[1], 10, &override))
940                 adjust_vdd(override);   /* the value is checked by callee */
941         else
942                 return CMD_RET_USAGE;
943         return 0;
944 }
945
946 static int do_vdd_read(struct cmd_tbl *cmdtp, int flag, int argc,
947                        char *const argv[])
948 {
949         if (argc < 1)
950                 return CMD_RET_USAGE;
951         print_vdd();
952
953         return 0;
954 }
955
956 U_BOOT_CMD(
957         vdd_override, 2, 0, do_vdd_override,
958         "override VDD",
959         " - override with the voltage specified in mV, eg. 1050"
960 );
961
962 U_BOOT_CMD(
963         vdd_read, 1, 0, do_vdd_read,
964         "read VDD",
965         " - Read the voltage specified in mV"
966 )