Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 | /*
* OMAP3/OMAP4 Voltage Management Routines
*
* Author: Thara Gopinath <thara@ti.com>
*
* Copyright (C) 2007 Texas Instruments, Inc.
* Rajendra Nayak <rnayak@ti.com>
* Lesly A M <x0080970@ti.com>
*
* Copyright (C) 2008, 2011 Nokia Corporation
* Kalle Jokiniemi
* Paul Walmsley
*
* Copyright (C) 2010 Texas Instruments, Inc.
* Thara Gopinath <thara@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <plat/common.h>
#include "prm-regbits-34xx.h"
#include "prm-regbits-44xx.h"
#include "prm44xx.h"
#include "prcm44xx.h"
#include "prminst44xx.h"
#include "control.h"
#include "voltage.h"
#include "vc.h"
#include "vp.h"
#define VOLTAGE_DIR_SIZE 16
static struct omap_vdd_info **vdd_info;
/*
* Number of scalable voltage domains.
*/
static int nr_scalable_vdd;
/* XXX document */
static s16 prm_mod_offs;
static s16 prm_irqst_ocp_mod_offs;
static struct dentry *voltage_dir;
/* Init function pointers */
static int vp_forceupdate_scale_voltage(struct omap_vdd_info *vdd,
unsigned long target_volt);
static u32 omap3_voltage_read_reg(u16 mod, u8 offset)
{
return omap2_prm_read_mod_reg(mod, offset);
}
static void omap3_voltage_write_reg(u32 val, u16 mod, u8 offset)
{
omap2_prm_write_mod_reg(val, mod, offset);
}
static u32 omap4_voltage_read_reg(u16 mod, u8 offset)
{
return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
mod, offset);
}
static void omap4_voltage_write_reg(u32 val, u16 mod, u8 offset)
{
omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION, mod, offset);
}
static int __init _config_common_vdd_data(struct omap_vdd_info *vdd)
{
char *sys_ck_name;
struct clk *sys_ck;
u32 sys_clk_speed, timeout_val, waittime;
/*
* XXX Clockfw should handle this, or this should be in a
* struct record
*/
if (cpu_is_omap24xx() || cpu_is_omap34xx())
sys_ck_name = "sys_ck";
else if (cpu_is_omap44xx())
sys_ck_name = "sys_clkin_ck";
else
return -EINVAL;
/*
* Sys clk rate is require to calculate vp timeout value and
* smpswaittimemin and smpswaittimemax.
*/
sys_ck = clk_get(NULL, sys_ck_name);
if (IS_ERR(sys_ck)) {
pr_warning("%s: Could not get the sys clk to calculate"
"various vdd_%s params\n", __func__, vdd->voltdm.name);
return -EINVAL;
}
sys_clk_speed = clk_get_rate(sys_ck);
clk_put(sys_ck);
/* Divide to avoid overflow */
sys_clk_speed /= 1000;
/* Generic voltage parameters */
vdd->volt_scale = vp_forceupdate_scale_voltage;
vdd->vp_enabled = false;
vdd->vp_rt_data.vpconfig_erroroffset =
(vdd->pmic_info->vp_erroroffset <<
vdd->vp_data->vp_common->vpconfig_erroroffset_shift);
timeout_val = (sys_clk_speed * vdd->pmic_info->vp_timeout_us) / 1000;
vdd->vp_rt_data.vlimitto_timeout = timeout_val;
vdd->vp_rt_data.vlimitto_vddmin = vdd->pmic_info->vp_vddmin;
vdd->vp_rt_data.vlimitto_vddmax = vdd->pmic_info->vp_vddmax;
waittime = ((vdd->pmic_info->step_size / vdd->pmic_info->slew_rate) *
sys_clk_speed) / 1000;
vdd->vp_rt_data.vstepmin_smpswaittimemin = waittime;
vdd->vp_rt_data.vstepmax_smpswaittimemax = waittime;
vdd->vp_rt_data.vstepmin_stepmin = vdd->pmic_info->vp_vstepmin;
vdd->vp_rt_data.vstepmax_stepmax = vdd->pmic_info->vp_vstepmax;
return 0;
}
/* Voltage debugfs support */
static int vp_volt_debug_get(void *data, u64 *val)
{
struct omap_vdd_info *vdd = (struct omap_vdd_info *) data;
u8 vsel;
if (!vdd) {
pr_warning("Wrong paramater passed\n");
return -EINVAL;
}
vsel = vdd->read_reg(prm_mod_offs, vdd->vp_data->voltage);
if (!vdd->pmic_info->vsel_to_uv) {
pr_warning("PMIC function to convert vsel to voltage"
"in uV not registerd\n");
return -EINVAL;
}
*val = vdd->pmic_info->vsel_to_uv(vsel);
return 0;
}
static int nom_volt_debug_get(void *data, u64 *val)
{
struct omap_vdd_info *vdd = (struct omap_vdd_info *) data;
if (!vdd) {
pr_warning("Wrong paramater passed\n");
return -EINVAL;
}
*val = omap_voltage_get_nom_volt(&vdd->voltdm);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(vp_volt_debug_fops, vp_volt_debug_get, NULL, "%llu\n");
DEFINE_SIMPLE_ATTRIBUTE(nom_volt_debug_fops, nom_volt_debug_get, NULL,
"%llu\n");
static void vp_latch_vsel(struct omap_vdd_info *vdd)
{
u32 vpconfig;
unsigned long uvdc;
char vsel;
uvdc = omap_voltage_get_nom_volt(&vdd->voltdm);
if (!uvdc) {
pr_warning("%s: unable to find current voltage for vdd_%s\n",
__func__, vdd->voltdm.name);
return;
}
if (!vdd->pmic_info || !vdd->pmic_info->uv_to_vsel) {
pr_warning("%s: PMIC function to convert voltage in uV to"
" vsel not registered\n", __func__);
return;
}
vsel = vdd->pmic_info->uv_to_vsel(uvdc);
vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig);
vpconfig &= ~(vdd->vp_data->vp_common->vpconfig_initvoltage_mask |
vdd->vp_data->vp_common->vpconfig_initvdd);
vpconfig |= vsel << vdd->vp_data->vp_common->vpconfig_initvoltage_shift;
vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig);
/* Trigger initVDD value copy to voltage processor */
vdd->write_reg((vpconfig | vdd->vp_data->vp_common->vpconfig_initvdd),
prm_mod_offs, vdd->vp_data->vpconfig);
/* Clear initVDD copy trigger bit */
vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig);
}
/* Generic voltage init functions */
static void __init vp_init(struct omap_vdd_info *vdd)
{
u32 vp_val;
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, vdd->voltdm.name);
return;
}
vp_val = vdd->vp_rt_data.vpconfig_erroroffset |
(vdd->vp_rt_data.vpconfig_errorgain <<
vdd->vp_data->vp_common->vpconfig_errorgain_shift) |
vdd->vp_data->vp_common->vpconfig_timeouten;
vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vpconfig);
vp_val = ((vdd->vp_rt_data.vstepmin_smpswaittimemin <<
vdd->vp_data->vp_common->vstepmin_smpswaittimemin_shift) |
(vdd->vp_rt_data.vstepmin_stepmin <<
vdd->vp_data->vp_common->vstepmin_stepmin_shift));
vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vstepmin);
vp_val = ((vdd->vp_rt_data.vstepmax_smpswaittimemax <<
vdd->vp_data->vp_common->vstepmax_smpswaittimemax_shift) |
(vdd->vp_rt_data.vstepmax_stepmax <<
vdd->vp_data->vp_common->vstepmax_stepmax_shift));
vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vstepmax);
vp_val = ((vdd->vp_rt_data.vlimitto_vddmax <<
vdd->vp_data->vp_common->vlimitto_vddmax_shift) |
(vdd->vp_rt_data.vlimitto_vddmin <<
vdd->vp_data->vp_common->vlimitto_vddmin_shift) |
(vdd->vp_rt_data.vlimitto_timeout <<
vdd->vp_data->vp_common->vlimitto_timeout_shift));
vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vlimitto);
}
static void __init vdd_debugfs_init(struct omap_vdd_info *vdd)
{
char *name;
name = kzalloc(VOLTAGE_DIR_SIZE, GFP_KERNEL);
if (!name) {
pr_warning("%s: Unable to allocate memory for debugfs"
" directory name for vdd_%s",
__func__, vdd->voltdm.name);
return;
}
strcpy(name, "vdd_");
strcat(name, vdd->voltdm.name);
vdd->debug_dir = debugfs_create_dir(name, voltage_dir);
kfree(name);
if (IS_ERR(vdd->debug_dir)) {
pr_warning("%s: Unable to create debugfs directory for"
" vdd_%s\n", __func__, vdd->voltdm.name);
vdd->debug_dir = NULL;
return;
}
(void) debugfs_create_x16("vp_errorgain", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vpconfig_errorgain));
(void) debugfs_create_x16("vp_smpswaittimemin", S_IRUGO,
vdd->debug_dir,
&(vdd->vp_rt_data.vstepmin_smpswaittimemin));
(void) debugfs_create_x8("vp_stepmin", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vstepmin_stepmin));
(void) debugfs_create_x16("vp_smpswaittimemax", S_IRUGO,
vdd->debug_dir,
&(vdd->vp_rt_data.vstepmax_smpswaittimemax));
(void) debugfs_create_x8("vp_stepmax", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vstepmax_stepmax));
(void) debugfs_create_x8("vp_vddmax", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vlimitto_vddmax));
(void) debugfs_create_x8("vp_vddmin", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vlimitto_vddmin));
(void) debugfs_create_x16("vp_timeout", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vlimitto_timeout));
(void) debugfs_create_file("curr_vp_volt", S_IRUGO, vdd->debug_dir,
(void *) vdd, &vp_volt_debug_fops);
(void) debugfs_create_file("curr_nominal_volt", S_IRUGO,
vdd->debug_dir, (void *) vdd,
&nom_volt_debug_fops);
}
/* Voltage scale and accessory APIs */
static int _pre_volt_scale(struct omap_vdd_info *vdd,
unsigned long target_volt, u8 *target_vsel, u8 *current_vsel)
{
struct omap_volt_data *volt_data;
const struct omap_vc_common_data *vc_common;
const struct omap_vp_common_data *vp_common;
u32 vc_cmdval, vp_errgain_val;
vc_common = vdd->vc_data->vc_common;
vp_common = vdd->vp_data->vp_common;
/* Check if suffiecient pmic info is available for this vdd */
if (!vdd->pmic_info) {
pr_err("%s: Insufficient pmic info to scale the vdd_%s\n",
__func__, vdd->voltdm.name);
return -EINVAL;
}
if (!vdd->pmic_info->uv_to_vsel) {
pr_err("%s: PMIC function to convert voltage in uV to"
"vsel not registered. Hence unable to scale voltage"
"for vdd_%s\n", __func__, vdd->voltdm.name);
return -ENODATA;
}
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, vdd->voltdm.name);
return -EINVAL;
}
/* Get volt_data corresponding to target_volt */
volt_data = omap_voltage_get_voltdata(&vdd->voltdm, target_volt);
if (IS_ERR(volt_data))
volt_data = NULL;
*target_vsel = vdd->pmic_info->uv_to_vsel(target_volt);
*current_vsel = vdd->read_reg(prm_mod_offs, vdd->vp_data->voltage);
/* Setting the ON voltage to the new target voltage */
vc_cmdval = vdd->read_reg(prm_mod_offs, vdd->vc_data->cmdval_reg);
vc_cmdval &= ~vc_common->cmd_on_mask;
vc_cmdval |= (*target_vsel << vc_common->cmd_on_shift);
vdd->write_reg(vc_cmdval, prm_mod_offs, vdd->vc_data->cmdval_reg);
/* Setting vp errorgain based on the voltage */
if (volt_data) {
vp_errgain_val = vdd->read_reg(prm_mod_offs,
vdd->vp_data->vpconfig);
vdd->vp_rt_data.vpconfig_errorgain = volt_data->vp_errgain;
vp_errgain_val &= ~vp_common->vpconfig_errorgain_mask;
vp_errgain_val |= vdd->vp_rt_data.vpconfig_errorgain <<
vp_common->vpconfig_errorgain_shift;
vdd->write_reg(vp_errgain_val, prm_mod_offs,
vdd->vp_data->vpconfig);
}
return 0;
}
static void _post_volt_scale(struct omap_vdd_info *vdd,
unsigned long target_volt, u8 target_vsel, u8 current_vsel)
{
u32 smps_steps = 0, smps_delay = 0;
smps_steps = abs(target_vsel - current_vsel);
/* SMPS slew rate / step size. 2us added as buffer. */
smps_delay = ((smps_steps * vdd->pmic_info->step_size) /
vdd->pmic_info->slew_rate) + 2;
udelay(smps_delay);
vdd->curr_volt = target_volt;
}
/* vc_bypass_scale_voltage - VC bypass method of voltage scaling */
static int vc_bypass_scale_voltage(struct omap_vdd_info *vdd,
unsigned long target_volt)
{
u32 loop_cnt = 0, retries_cnt = 0;
u32 vc_valid, vc_bypass_val_reg, vc_bypass_value;
u8 target_vsel, current_vsel;
int ret;
ret = _pre_volt_scale(vdd, target_volt, &target_vsel, ¤t_vsel);
if (ret)
return ret;
vc_valid = vdd->vc_data->vc_common->valid;
vc_bypass_val_reg = vdd->vc_data->vc_common->bypass_val_reg;
vc_bypass_value = (target_vsel << vdd->vc_data->vc_common->data_shift) |
(vdd->pmic_info->pmic_reg <<
vdd->vc_data->vc_common->regaddr_shift) |
(vdd->pmic_info->i2c_slave_addr <<
vdd->vc_data->vc_common->slaveaddr_shift);
vdd->write_reg(vc_bypass_value, prm_mod_offs, vc_bypass_val_reg);
vdd->write_reg(vc_bypass_value | vc_valid, prm_mod_offs,
vc_bypass_val_reg);
vc_bypass_value = vdd->read_reg(prm_mod_offs, vc_bypass_val_reg);
/*
* Loop till the bypass command is acknowledged from the SMPS.
* NOTE: This is legacy code. The loop count and retry count needs
* to be revisited.
*/
while (!(vc_bypass_value & vc_valid)) {
loop_cnt++;
if (retries_cnt > 10) {
pr_warning("%s: Retry count exceeded\n", __func__);
return -ETIMEDOUT;
}
if (loop_cnt > 50) {
retries_cnt++;
loop_cnt = 0;
udelay(10);
}
vc_bypass_value = vdd->read_reg(prm_mod_offs,
vc_bypass_val_reg);
}
_post_volt_scale(vdd, target_volt, target_vsel, current_vsel);
return 0;
}
/* VP force update method of voltage scaling */
static int vp_forceupdate_scale_voltage(struct omap_vdd_info *vdd,
unsigned long target_volt)
{
u32 vpconfig;
u8 target_vsel, current_vsel, prm_irqst_reg;
int ret, timeout = 0;
ret = _pre_volt_scale(vdd, target_volt, &target_vsel, ¤t_vsel);
if (ret)
return ret;
prm_irqst_reg = vdd->vp_data->prm_irqst_data->prm_irqst_reg;
/*
* Clear all pending TransactionDone interrupt/status. Typical latency
* is <3us
*/
while (timeout++ < VP_TRANXDONE_TIMEOUT) {
vdd->write_reg(vdd->vp_data->prm_irqst_data->tranxdone_status,
prm_irqst_ocp_mod_offs, prm_irqst_reg);
if (!(vdd->read_reg(prm_irqst_ocp_mod_offs, prm_irqst_reg) &
vdd->vp_data->prm_irqst_data->tranxdone_status))
break;
udelay(1);
}
if (timeout >= VP_TRANXDONE_TIMEOUT) {
pr_warning("%s: vdd_%s TRANXDONE timeout exceeded."
"Voltage change aborted", __func__, vdd->voltdm.name);
return -ETIMEDOUT;
}
/* Configure for VP-Force Update */
vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig);
vpconfig &= ~(vdd->vp_data->vp_common->vpconfig_initvdd |
vdd->vp_data->vp_common->vpconfig_forceupdate |
vdd->vp_data->vp_common->vpconfig_initvoltage_mask);
vpconfig |= ((target_vsel <<
vdd->vp_data->vp_common->vpconfig_initvoltage_shift));
vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig);
/* Trigger initVDD value copy to voltage processor */
vpconfig |= vdd->vp_data->vp_common->vpconfig_initvdd;
vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig);
/* Force update of voltage */
vpconfig |= vdd->vp_data->vp_common->vpconfig_forceupdate;
vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig);
/*
* Wait for TransactionDone. Typical latency is <200us.
* Depends on SMPSWAITTIMEMIN/MAX and voltage change
*/
timeout = 0;
omap_test_timeout((vdd->read_reg(prm_irqst_ocp_mod_offs, prm_irqst_reg) &
vdd->vp_data->prm_irqst_data->tranxdone_status),
VP_TRANXDONE_TIMEOUT, timeout);
if (timeout >= VP_TRANXDONE_TIMEOUT)
pr_err("%s: vdd_%s TRANXDONE timeout exceeded."
"TRANXDONE never got set after the voltage update\n",
__func__, vdd->voltdm.name);
_post_volt_scale(vdd, target_volt, target_vsel, current_vsel);
/*
* Disable TransactionDone interrupt , clear all status, clear
* control registers
*/
timeout = 0;
while (timeout++ < VP_TRANXDONE_TIMEOUT) {
vdd->write_reg(vdd->vp_data->prm_irqst_data->tranxdone_status,
prm_irqst_ocp_mod_offs, prm_irqst_reg);
if (!(vdd->read_reg(prm_irqst_ocp_mod_offs, prm_irqst_reg) &
vdd->vp_data->prm_irqst_data->tranxdone_status))
break;
udelay(1);
}
if (timeout >= VP_TRANXDONE_TIMEOUT)
pr_warning("%s: vdd_%s TRANXDONE timeout exceeded while trying"
"to clear the TRANXDONE status\n",
__func__, vdd->voltdm.name);
vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig);
/* Clear initVDD copy trigger bit */
vpconfig &= ~vdd->vp_data->vp_common->vpconfig_initvdd;
vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig);
/* Clear force bit */
vpconfig &= ~vdd->vp_data->vp_common->vpconfig_forceupdate;
vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig);
return 0;
}
static void __init omap3_vfsm_init(struct omap_vdd_info *vdd)
{
/*
* Voltage Manager FSM parameters init
* XXX This data should be passed in from the board file
*/
vdd->write_reg(OMAP3_CLKSETUP, prm_mod_offs, OMAP3_PRM_CLKSETUP_OFFSET);
vdd->write_reg(OMAP3_VOLTOFFSET, prm_mod_offs,
OMAP3_PRM_VOLTOFFSET_OFFSET);
vdd->write_reg(OMAP3_VOLTSETUP2, prm_mod_offs,
OMAP3_PRM_VOLTSETUP2_OFFSET);
}
static void __init omap3_vc_init(struct omap_vdd_info *vdd)
{
static bool is_initialized;
u8 on_vsel, onlp_vsel, ret_vsel, off_vsel;
u32 vc_val;
if (is_initialized)
return;
/* Set up the on, inactive, retention and off voltage */
on_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->on_volt);
onlp_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->onlp_volt);
ret_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->ret_volt);
off_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->off_volt);
vc_val = ((on_vsel << vdd->vc_data->vc_common->cmd_on_shift) |
(onlp_vsel << vdd->vc_data->vc_common->cmd_onlp_shift) |
(ret_vsel << vdd->vc_data->vc_common->cmd_ret_shift) |
(off_vsel << vdd->vc_data->vc_common->cmd_off_shift));
vdd->write_reg(vc_val, prm_mod_offs, vdd->vc_data->cmdval_reg);
/*
* Generic VC parameters init
* XXX This data should be abstracted out
*/
vdd->write_reg(OMAP3430_CMD1_MASK | OMAP3430_RAV1_MASK, prm_mod_offs,
OMAP3_PRM_VC_CH_CONF_OFFSET);
vdd->write_reg(OMAP3430_MCODE_SHIFT | OMAP3430_HSEN_MASK, prm_mod_offs,
OMAP3_PRM_VC_I2C_CFG_OFFSET);
omap3_vfsm_init(vdd);
is_initialized = true;
}
/* OMAP4 specific voltage init functions */
static void __init omap4_vc_init(struct omap_vdd_info *vdd)
{
static bool is_initialized;
u32 vc_val;
if (is_initialized)
return;
/* TODO: Configure setup times and CMD_VAL values*/
/*
* Generic VC parameters init
* XXX This data should be abstracted out
*/
vc_val = (OMAP4430_RAV_VDD_MPU_L_MASK | OMAP4430_CMD_VDD_MPU_L_MASK |
OMAP4430_RAV_VDD_IVA_L_MASK | OMAP4430_CMD_VDD_IVA_L_MASK |
OMAP4430_RAV_VDD_CORE_L_MASK | OMAP4430_CMD_VDD_CORE_L_MASK);
vdd->write_reg(vc_val, prm_mod_offs, OMAP4_PRM_VC_CFG_CHANNEL_OFFSET);
/* XXX These are magic numbers and do not belong! */
vc_val = (0x60 << OMAP4430_SCLL_SHIFT | 0x26 << OMAP4430_SCLH_SHIFT);
vdd->write_reg(vc_val, prm_mod_offs, OMAP4_PRM_VC_CFG_I2C_CLK_OFFSET);
is_initialized = true;
}
static void __init omap_vc_init(struct omap_vdd_info *vdd)
{
u32 vc_val;
if (!vdd->pmic_info || !vdd->pmic_info->uv_to_vsel) {
pr_err("%s: PMIC info requried to configure vc for"
"vdd_%s not populated.Hence cannot initialize vc\n",
__func__, vdd->voltdm.name);
return;
}
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, vdd->voltdm.name);
return;
}
/* Set up the SMPS_SA(i2c slave address in VC */
vc_val = vdd->read_reg(prm_mod_offs,
vdd->vc_data->vc_common->smps_sa_reg);
vc_val &= ~vdd->vc_data->smps_sa_mask;
vc_val |= vdd->pmic_info->i2c_slave_addr << vdd->vc_data->smps_sa_shift;
vdd->write_reg(vc_val, prm_mod_offs,
vdd->vc_data->vc_common->smps_sa_reg);
/* Setup the VOLRA(pmic reg addr) in VC */
vc_val = vdd->read_reg(prm_mod_offs,
vdd->vc_data->vc_common->smps_volra_reg);
vc_val &= ~vdd->vc_data->smps_volra_mask;
vc_val |= vdd->pmic_info->pmic_reg << vdd->vc_data->smps_volra_shift;
vdd->write_reg(vc_val, prm_mod_offs,
vdd->vc_data->vc_common->smps_volra_reg);
/* Configure the setup times */
vc_val = vdd->read_reg(prm_mod_offs, vdd->vfsm->voltsetup_reg);
vc_val &= ~vdd->vfsm->voltsetup_mask;
vc_val |= vdd->pmic_info->volt_setup_time <<
vdd->vfsm->voltsetup_shift;
vdd->write_reg(vc_val, prm_mod_offs, vdd->vfsm->voltsetup_reg);
if (cpu_is_omap34xx())
omap3_vc_init(vdd);
else if (cpu_is_omap44xx())
omap4_vc_init(vdd);
}
static int __init omap_vdd_data_configure(struct omap_vdd_info *vdd)
{
int ret = -EINVAL;
if (!vdd->pmic_info) {
pr_err("%s: PMIC info requried to configure vdd_%s not"
"populated.Hence cannot initialize vdd_%s\n",
__func__, vdd->voltdm.name, vdd->voltdm.name);
goto ovdc_out;
}
if (IS_ERR_VALUE(_config_common_vdd_data(vdd)))
goto ovdc_out;
if (cpu_is_omap34xx()) {
vdd->read_reg = omap3_voltage_read_reg;
vdd->write_reg = omap3_voltage_write_reg;
ret = 0;
} else if (cpu_is_omap44xx()) {
vdd->read_reg = omap4_voltage_read_reg;
vdd->write_reg = omap4_voltage_write_reg;
ret = 0;
}
ovdc_out:
return ret;
}
/* Public functions */
/**
* omap_voltage_get_nom_volt() - Gets the current non-auto-compensated voltage
* @voltdm: pointer to the VDD for which current voltage info is needed
*
* API to get the current non-auto-compensated voltage for a VDD.
* Returns 0 in case of error else returns the current voltage for the VDD.
*/
unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm)
{
struct omap_vdd_info *vdd;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return 0;
}
vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
return vdd->curr_volt;
}
/**
* omap_vp_get_curr_volt() - API to get the current vp voltage.
* @voltdm: pointer to the VDD.
*
* This API returns the current voltage for the specified voltage processor
*/
unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm)
{
struct omap_vdd_info *vdd;
u8 curr_vsel;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return 0;
}
vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
if (!vdd->read_reg) {
pr_err("%s: No read API for reading vdd_%s regs\n",
__func__, voltdm->name);
return 0;
}
curr_vsel = vdd->read_reg(prm_mod_offs, vdd->vp_data->voltage);
if (!vdd->pmic_info || !vdd->pmic_info->vsel_to_uv) {
pr_warning("%s: PMIC function to convert vsel to voltage"
"in uV not registerd\n", __func__);
return 0;
}
return vdd->pmic_info->vsel_to_uv(curr_vsel);
}
/**
* omap_vp_enable() - API to enable a particular VP
* @voltdm: pointer to the VDD whose VP is to be enabled.
*
* This API enables a particular voltage processor. Needed by the smartreflex
* class drivers.
*/
void omap_vp_enable(struct voltagedomain *voltdm)
{
struct omap_vdd_info *vdd;
u32 vpconfig;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return;
}
vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, voltdm->name);
return;
}
/* If VP is already enabled, do nothing. Return */
if (vdd->vp_enabled)
return;
vp_latch_vsel(vdd);
/* Enable VP */
vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig);
vpconfig |= vdd->vp_data->vp_common->vpconfig_vpenable;
vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig);
vdd->vp_enabled = true;
}
/**
* omap_vp_disable() - API to disable a particular VP
* @voltdm: pointer to the VDD whose VP is to be disabled.
*
* This API disables a particular voltage processor. Needed by the smartreflex
* class drivers.
*/
void omap_vp_disable(struct voltagedomain *voltdm)
{
struct omap_vdd_info *vdd;
u32 vpconfig;
int timeout;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return;
}
vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, voltdm->name);
return;
}
/* If VP is already disabled, do nothing. Return */
if (!vdd->vp_enabled) {
pr_warning("%s: Trying to disable VP for vdd_%s when"
"it is already disabled\n", __func__, voltdm->name);
return;
}
/* Disable VP */
vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig);
vpconfig &= ~vdd->vp_data->vp_common->vpconfig_vpenable;
vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig);
/*
* Wait for VP idle Typical latency is <2us. Maximum latency is ~100us
*/
omap_test_timeout((vdd->read_reg(prm_mod_offs, vdd->vp_data->vstatus)),
VP_IDLE_TIMEOUT, timeout);
if (timeout >= VP_IDLE_TIMEOUT)
pr_warning("%s: vdd_%s idle timedout\n",
__func__, voltdm->name);
vdd->vp_enabled = false;
return;
}
/**
* omap_voltage_scale_vdd() - API to scale voltage of a particular
* voltage domain.
* @voltdm: pointer to the VDD which is to be scaled.
* @target_volt: The target voltage of the voltage domain
*
* This API should be called by the kernel to do the voltage scaling
* for a particular voltage domain during dvfs or any other situation.
*/
int omap_voltage_scale_vdd(struct voltagedomain *voltdm,
unsigned long target_volt)
{
struct omap_vdd_info *vdd;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return -EINVAL;
}
vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
if (!vdd->volt_scale) {
pr_err("%s: No voltage scale API registered for vdd_%s\n",
__func__, voltdm->name);
return -ENODATA;
}
return vdd->volt_scale(vdd, target_volt);
}
/**
* omap_voltage_reset() - Resets the voltage of a particular voltage domain
* to that of the current OPP.
* @voltdm: pointer to the VDD whose voltage is to be reset.
*
* This API finds out the correct voltage the voltage domain is supposed
* to be at and resets the voltage to that level. Should be used especially
* while disabling any voltage compensation modules.
*/
void omap_voltage_reset(struct voltagedomain *voltdm)
{
unsigned long target_uvdc;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return;
}
target_uvdc = omap_voltage_get_nom_volt(voltdm);
if (!target_uvdc) {
pr_err("%s: unable to find current voltage for vdd_%s\n",
__func__, voltdm->name);
return;
}
omap_voltage_scale_vdd(voltdm, target_uvdc);
}
/**
* omap_voltage_get_volttable() - API to get the voltage table associated with a
* particular voltage domain.
* @voltdm: pointer to the VDD for which the voltage table is required
* @volt_data: the voltage table for the particular vdd which is to be
* populated by this API
*
* This API populates the voltage table associated with a VDD into the
* passed parameter pointer. Returns the count of distinct voltages
* supported by this vdd.
*
*/
void omap_voltage_get_volttable(struct voltagedomain *voltdm,
struct omap_volt_data **volt_data)
{
struct omap_vdd_info *vdd;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return;
}
vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
*volt_data = vdd->volt_data;
}
/**
* omap_voltage_get_voltdata() - API to get the voltage table entry for a
* particular voltage
* @voltdm: pointer to the VDD whose voltage table has to be searched
* @volt: the voltage to be searched in the voltage table
*
* This API searches through the voltage table for the required voltage
* domain and tries to find a matching entry for the passed voltage volt.
* If a matching entry is found volt_data is populated with that entry.
* This API searches only through the non-compensated voltages int the
* voltage table.
* Returns pointer to the voltage table entry corresponding to volt on
* success. Returns -ENODATA if no voltage table exisits for the passed voltage
* domain or if there is no matching entry.
*/
struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm,
unsigned long volt)
{
struct omap_vdd_info *vdd;
int i;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return ERR_PTR(-EINVAL);
}
vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
if (!vdd->volt_data) {
pr_warning("%s: voltage table does not exist for vdd_%s\n",
__func__, voltdm->name);
return ERR_PTR(-ENODATA);
}
for (i = 0; vdd->volt_data[i].volt_nominal != 0; i++) {
if (vdd->volt_data[i].volt_nominal == volt)
return &vdd->volt_data[i];
}
pr_notice("%s: Unable to match the current voltage with the voltage"
"table for vdd_%s\n", __func__, voltdm->name);
return ERR_PTR(-ENODATA);
}
/**
* omap_voltage_register_pmic() - API to register PMIC specific data
* @voltdm: pointer to the VDD for which the PMIC specific data is
* to be registered
* @pmic_info: the structure containing pmic info
*
* This API is to be called by the SOC/PMIC file to specify the
* pmic specific info as present in omap_volt_pmic_info structure.
*/
int omap_voltage_register_pmic(struct voltagedomain *voltdm,
struct omap_volt_pmic_info *pmic_info)
{
struct omap_vdd_info *vdd;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return -EINVAL;
}
vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
vdd->pmic_info = pmic_info;
return 0;
}
/**
* omap_voltage_get_dbgdir() - API to get pointer to the debugfs directory
* corresponding to a voltage domain.
*
* @voltdm: pointer to the VDD whose debug directory is required.
*
* This API returns pointer to the debugfs directory corresponding
* to the voltage domain. Should be used by drivers requiring to
* add any debug entry for a particular voltage domain. Returns NULL
* in case of error.
*/
struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm)
{
struct omap_vdd_info *vdd;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return NULL;
}
vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
return vdd->debug_dir;
}
/**
* omap_change_voltscale_method() - API to change the voltage scaling method.
* @voltdm: pointer to the VDD whose voltage scaling method
* has to be changed.
* @voltscale_method: the method to be used for voltage scaling.
*
* This API can be used by the board files to change the method of voltage
* scaling between vpforceupdate and vcbypass. The parameter values are
* defined in voltage.h
*/
void omap_change_voltscale_method(struct voltagedomain *voltdm,
int voltscale_method)
{
struct omap_vdd_info *vdd;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return;
}
vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
switch (voltscale_method) {
case VOLTSCALE_VPFORCEUPDATE:
vdd->volt_scale = vp_forceupdate_scale_voltage;
return;
case VOLTSCALE_VCBYPASS:
vdd->volt_scale = vc_bypass_scale_voltage;
return;
default:
pr_warning("%s: Trying to change the method of voltage scaling"
"to an unsupported one!\n", __func__);
}
}
/**
* omap_voltage_domain_lookup() - API to get the voltage domain pointer
* @name: Name of the voltage domain
*
* This API looks up in the global vdd_info struct for the
* existence of voltage domain <name>. If it exists, the API returns
* a pointer to the voltage domain structure corresponding to the
* VDD<name>. Else retuns error pointer.
*/
struct voltagedomain *omap_voltage_domain_lookup(char *name)
{
int i;
if (!vdd_info) {
pr_err("%s: Voltage driver init not yet happened.Faulting!\n",
__func__);
return ERR_PTR(-EINVAL);
}
if (!name) {
pr_err("%s: No name to get the votage domain!\n", __func__);
return ERR_PTR(-EINVAL);
}
for (i = 0; i < nr_scalable_vdd; i++) {
if (!(strcmp(name, vdd_info[i]->voltdm.name)))
return &vdd_info[i]->voltdm;
}
return ERR_PTR(-EINVAL);
}
/**
* omap_voltage_late_init() - Init the various voltage parameters
*
* This API is to be called in the later stages of the
* system boot to init the voltage controller and
* voltage processors.
*/
int __init omap_voltage_late_init(void)
{
int i;
if (!vdd_info) {
pr_err("%s: Voltage driver support not added\n",
__func__);
return -EINVAL;
}
voltage_dir = debugfs_create_dir("voltage", NULL);
if (IS_ERR(voltage_dir))
pr_err("%s: Unable to create voltage debugfs main dir\n",
__func__);
for (i = 0; i < nr_scalable_vdd; i++) {
if (omap_vdd_data_configure(vdd_info[i]))
continue;
omap_vc_init(vdd_info[i]);
vp_init(vdd_info[i]);
vdd_debugfs_init(vdd_info[i]);
}
return 0;
}
/* XXX document */
int __init omap_voltage_early_init(s16 prm_mod, s16 prm_irqst_ocp_mod,
struct omap_vdd_info *omap_vdd_array[],
u8 omap_vdd_count)
{
prm_mod_offs = prm_mod;
prm_irqst_ocp_mod_offs = prm_irqst_ocp_mod;
vdd_info = omap_vdd_array;
nr_scalable_vdd = omap_vdd_count;
return 0;
}
|