2 * OMAP3/OMAP4 Voltage Management Routines
4 * Author: Thara Gopinath <thara@ti.com>
6 * Copyright (C) 2007 Texas Instruments, Inc.
7 * Rajendra Nayak <rnayak@ti.com>
8 * Lesly A M <x0080970@ti.com>
10 * Copyright (C) 2008, 2011 Nokia Corporation
14 * Copyright (C) 2010 Texas Instruments, Inc.
15 * Thara Gopinath <thara@ti.com>
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License version 2 as
19 * published by the Free Software Foundation.
22 #include <linux/delay.h>
24 #include <linux/clk.h>
25 #include <linux/err.h>
26 #include <linux/debugfs.h>
27 #include <linux/slab.h>
29 #include <plat/common.h>
31 #include "prm-regbits-34xx.h"
32 #include "prm-regbits-44xx.h"
35 #include "prminst44xx.h"
39 #include "powerdomain.h"
44 static LIST_HEAD(voltdm_list);
46 #define VOLTAGE_DIR_SIZE 16
47 static struct dentry *voltage_dir;
49 static u32 omap3_voltage_read_reg(u16 mod, u8 offset)
51 return omap2_prm_read_mod_reg(mod, offset);
54 static void omap3_voltage_write_reg(u32 val, u16 mod, u8 offset)
56 omap2_prm_write_mod_reg(val, mod, offset);
59 static u32 omap4_voltage_read_reg(u16 mod, u8 offset)
61 return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
65 static void omap4_voltage_write_reg(u32 val, u16 mod, u8 offset)
67 omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION, mod, offset);
70 static int __init _config_common_vdd_data(struct voltagedomain *voltdm)
74 u32 sys_clk_speed, timeout_val, waittime;
75 struct omap_vdd_info *vdd = voltdm->vdd;
78 * XXX Clockfw should handle this, or this should be in a
81 if (cpu_is_omap24xx() || cpu_is_omap34xx())
82 sys_ck_name = "sys_ck";
83 else if (cpu_is_omap44xx())
84 sys_ck_name = "sys_clkin_ck";
89 * Sys clk rate is require to calculate vp timeout value and
90 * smpswaittimemin and smpswaittimemax.
92 sys_ck = clk_get(NULL, sys_ck_name);
94 pr_warning("%s: Could not get the sys clk to calculate"
95 "various vdd_%s params\n", __func__, voltdm->name);
98 sys_clk_speed = clk_get_rate(sys_ck);
100 /* Divide to avoid overflow */
101 sys_clk_speed /= 1000;
103 /* Generic voltage parameters */
104 vdd->volt_scale = omap_vp_forceupdate_scale;
105 vdd->vp_enabled = false;
107 vdd->vp_rt_data.vpconfig_erroroffset =
108 (vdd->pmic_info->vp_erroroffset <<
109 vdd->vp_data->vp_common->vpconfig_erroroffset_shift);
111 timeout_val = (sys_clk_speed * vdd->pmic_info->vp_timeout_us) / 1000;
112 vdd->vp_rt_data.vlimitto_timeout = timeout_val;
113 vdd->vp_rt_data.vlimitto_vddmin = vdd->pmic_info->vp_vddmin;
114 vdd->vp_rt_data.vlimitto_vddmax = vdd->pmic_info->vp_vddmax;
116 waittime = ((vdd->pmic_info->step_size / vdd->pmic_info->slew_rate) *
117 sys_clk_speed) / 1000;
118 vdd->vp_rt_data.vstepmin_smpswaittimemin = waittime;
119 vdd->vp_rt_data.vstepmax_smpswaittimemax = waittime;
120 vdd->vp_rt_data.vstepmin_stepmin = vdd->pmic_info->vp_vstepmin;
121 vdd->vp_rt_data.vstepmax_stepmax = vdd->pmic_info->vp_vstepmax;
126 static int nom_volt_debug_get(void *data, u64 *val)
128 struct voltagedomain *voltdm = (struct voltagedomain *)data;
131 pr_warning("Wrong paramater passed\n");
135 *val = omap_voltage_get_nom_volt(voltdm);
140 DEFINE_SIMPLE_ATTRIBUTE(nom_volt_debug_fops, nom_volt_debug_get, NULL,
142 static void __init vdd_debugfs_init(struct voltagedomain *voltdm)
145 struct omap_vdd_info *vdd = voltdm->vdd;
147 name = kzalloc(VOLTAGE_DIR_SIZE, GFP_KERNEL);
149 pr_warning("%s: Unable to allocate memory for debugfs"
150 " directory name for vdd_%s",
151 __func__, voltdm->name);
154 strcpy(name, "vdd_");
155 strcat(name, voltdm->name);
157 vdd->debug_dir = debugfs_create_dir(name, voltage_dir);
159 if (IS_ERR(vdd->debug_dir)) {
160 pr_warning("%s: Unable to create debugfs directory for"
161 " vdd_%s\n", __func__, voltdm->name);
162 vdd->debug_dir = NULL;
166 (void) debugfs_create_file("curr_nominal_volt", S_IRUGO,
167 vdd->debug_dir, (void *) voltdm,
168 &nom_volt_debug_fops);
171 static int __init omap_vdd_data_configure(struct voltagedomain *voltdm)
173 struct omap_vdd_info *vdd = voltdm->vdd;
176 if (!vdd->pmic_info) {
177 pr_err("%s: PMIC info requried to configure vdd_%s not"
178 "populated.Hence cannot initialize vdd_%s\n",
179 __func__, voltdm->name, voltdm->name);
183 if (IS_ERR_VALUE(_config_common_vdd_data(voltdm)))
186 if (cpu_is_omap34xx()) {
187 vdd->read_reg = omap3_voltage_read_reg;
188 vdd->write_reg = omap3_voltage_write_reg;
190 } else if (cpu_is_omap44xx()) {
191 vdd->read_reg = omap4_voltage_read_reg;
192 vdd->write_reg = omap4_voltage_write_reg;
200 /* Public functions */
202 * omap_voltage_get_nom_volt() - Gets the current non-auto-compensated voltage
203 * @voltdm: pointer to the VDD for which current voltage info is needed
205 * API to get the current non-auto-compensated voltage for a VDD.
206 * Returns 0 in case of error else returns the current voltage for the VDD.
208 unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm)
210 struct omap_vdd_info *vdd;
212 if (!voltdm || IS_ERR(voltdm)) {
213 pr_warning("%s: VDD specified does not exist!\n", __func__);
219 return vdd->curr_volt;
223 * omap_voltage_scale_vdd() - API to scale voltage of a particular
225 * @voltdm: pointer to the VDD which is to be scaled.
226 * @target_volt: The target voltage of the voltage domain
228 * This API should be called by the kernel to do the voltage scaling
229 * for a particular voltage domain during dvfs or any other situation.
231 int omap_voltage_scale_vdd(struct voltagedomain *voltdm,
232 unsigned long target_volt)
234 struct omap_vdd_info *vdd;
236 if (!voltdm || IS_ERR(voltdm)) {
237 pr_warning("%s: VDD specified does not exist!\n", __func__);
243 if (!vdd->volt_scale) {
244 pr_err("%s: No voltage scale API registered for vdd_%s\n",
245 __func__, voltdm->name);
249 return vdd->volt_scale(voltdm, target_volt);
253 * omap_voltage_reset() - Resets the voltage of a particular voltage domain
254 * to that of the current OPP.
255 * @voltdm: pointer to the VDD whose voltage is to be reset.
257 * This API finds out the correct voltage the voltage domain is supposed
258 * to be at and resets the voltage to that level. Should be used especially
259 * while disabling any voltage compensation modules.
261 void omap_voltage_reset(struct voltagedomain *voltdm)
263 unsigned long target_uvdc;
265 if (!voltdm || IS_ERR(voltdm)) {
266 pr_warning("%s: VDD specified does not exist!\n", __func__);
270 target_uvdc = omap_voltage_get_nom_volt(voltdm);
272 pr_err("%s: unable to find current voltage for vdd_%s\n",
273 __func__, voltdm->name);
277 omap_voltage_scale_vdd(voltdm, target_uvdc);
281 * omap_voltage_get_volttable() - API to get the voltage table associated with a
282 * particular voltage domain.
283 * @voltdm: pointer to the VDD for which the voltage table is required
284 * @volt_data: the voltage table for the particular vdd which is to be
285 * populated by this API
287 * This API populates the voltage table associated with a VDD into the
288 * passed parameter pointer. Returns the count of distinct voltages
289 * supported by this vdd.
292 void omap_voltage_get_volttable(struct voltagedomain *voltdm,
293 struct omap_volt_data **volt_data)
295 struct omap_vdd_info *vdd;
297 if (!voltdm || IS_ERR(voltdm)) {
298 pr_warning("%s: VDD specified does not exist!\n", __func__);
304 *volt_data = vdd->volt_data;
308 * omap_voltage_get_voltdata() - API to get the voltage table entry for a
310 * @voltdm: pointer to the VDD whose voltage table has to be searched
311 * @volt: the voltage to be searched in the voltage table
313 * This API searches through the voltage table for the required voltage
314 * domain and tries to find a matching entry for the passed voltage volt.
315 * If a matching entry is found volt_data is populated with that entry.
316 * This API searches only through the non-compensated voltages int the
318 * Returns pointer to the voltage table entry corresponding to volt on
319 * success. Returns -ENODATA if no voltage table exisits for the passed voltage
320 * domain or if there is no matching entry.
322 struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm,
325 struct omap_vdd_info *vdd;
328 if (!voltdm || IS_ERR(voltdm)) {
329 pr_warning("%s: VDD specified does not exist!\n", __func__);
330 return ERR_PTR(-EINVAL);
335 if (!vdd->volt_data) {
336 pr_warning("%s: voltage table does not exist for vdd_%s\n",
337 __func__, voltdm->name);
338 return ERR_PTR(-ENODATA);
341 for (i = 0; vdd->volt_data[i].volt_nominal != 0; i++) {
342 if (vdd->volt_data[i].volt_nominal == volt)
343 return &vdd->volt_data[i];
346 pr_notice("%s: Unable to match the current voltage with the voltage"
347 "table for vdd_%s\n", __func__, voltdm->name);
349 return ERR_PTR(-ENODATA);
353 * omap_voltage_register_pmic() - API to register PMIC specific data
354 * @voltdm: pointer to the VDD for which the PMIC specific data is
356 * @pmic_info: the structure containing pmic info
358 * This API is to be called by the SOC/PMIC file to specify the
359 * pmic specific info as present in omap_volt_pmic_info structure.
361 int omap_voltage_register_pmic(struct voltagedomain *voltdm,
362 struct omap_volt_pmic_info *pmic_info)
364 struct omap_vdd_info *vdd;
366 if (!voltdm || IS_ERR(voltdm)) {
367 pr_warning("%s: VDD specified does not exist!\n", __func__);
373 vdd->pmic_info = pmic_info;
379 * omap_voltage_get_dbgdir() - API to get pointer to the debugfs directory
380 * corresponding to a voltage domain.
382 * @voltdm: pointer to the VDD whose debug directory is required.
384 * This API returns pointer to the debugfs directory corresponding
385 * to the voltage domain. Should be used by drivers requiring to
386 * add any debug entry for a particular voltage domain. Returns NULL
389 struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm)
391 struct omap_vdd_info *vdd;
393 if (!voltdm || IS_ERR(voltdm)) {
394 pr_warning("%s: VDD specified does not exist!\n", __func__);
400 return vdd->debug_dir;
404 * omap_change_voltscale_method() - API to change the voltage scaling method.
405 * @voltdm: pointer to the VDD whose voltage scaling method
407 * @voltscale_method: the method to be used for voltage scaling.
409 * This API can be used by the board files to change the method of voltage
410 * scaling between vpforceupdate and vcbypass. The parameter values are
411 * defined in voltage.h
413 void omap_change_voltscale_method(struct voltagedomain *voltdm,
414 int voltscale_method)
416 struct omap_vdd_info *vdd;
418 if (!voltdm || IS_ERR(voltdm)) {
419 pr_warning("%s: VDD specified does not exist!\n", __func__);
425 switch (voltscale_method) {
426 case VOLTSCALE_VPFORCEUPDATE:
427 vdd->volt_scale = omap_vp_forceupdate_scale;
429 case VOLTSCALE_VCBYPASS:
430 vdd->volt_scale = omap_vc_bypass_scale;
433 pr_warning("%s: Trying to change the method of voltage scaling"
434 "to an unsupported one!\n", __func__);
439 * omap_voltage_late_init() - Init the various voltage parameters
441 * This API is to be called in the later stages of the
442 * system boot to init the voltage controller and
443 * voltage processors.
445 int __init omap_voltage_late_init(void)
447 struct voltagedomain *voltdm;
449 if (list_empty(&voltdm_list)) {
450 pr_err("%s: Voltage driver support not added\n",
455 voltage_dir = debugfs_create_dir("voltage", NULL);
456 if (IS_ERR(voltage_dir))
457 pr_err("%s: Unable to create voltage debugfs main dir\n",
459 list_for_each_entry(voltdm, &voltdm_list, node) {
460 if (!voltdm->scalable)
464 voltdm->vdd->volt_scale = omap_vc_bypass_scale;
465 omap_vc_init_channel(voltdm);
469 if (omap_vdd_data_configure(voltdm))
471 vdd_debugfs_init(voltdm);
472 omap_vp_init(voltdm);
479 static struct voltagedomain *_voltdm_lookup(const char *name)
481 struct voltagedomain *voltdm, *temp_voltdm;
485 list_for_each_entry(temp_voltdm, &voltdm_list, node) {
486 if (!strcmp(name, temp_voltdm->name)) {
487 voltdm = temp_voltdm;
496 * voltdm_add_pwrdm - add a powerdomain to a voltagedomain
497 * @voltdm: struct voltagedomain * to add the powerdomain to
498 * @pwrdm: struct powerdomain * to associate with a voltagedomain
500 * Associate the powerdomain @pwrdm with a voltagedomain @voltdm. This
501 * enables the use of voltdm_for_each_pwrdm(). Returns -EINVAL if
502 * presented with invalid pointers; -ENOMEM if memory could not be allocated;
505 int voltdm_add_pwrdm(struct voltagedomain *voltdm, struct powerdomain *pwrdm)
507 if (!voltdm || !pwrdm)
510 pr_debug("voltagedomain: associating powerdomain %s with voltagedomain "
511 "%s\n", pwrdm->name, voltdm->name);
513 list_add(&pwrdm->voltdm_node, &voltdm->pwrdm_list);
519 * voltdm_for_each_pwrdm - call function for each pwrdm in a voltdm
520 * @voltdm: struct voltagedomain * to iterate over
521 * @fn: callback function *
523 * Call the supplied function @fn for each powerdomain in the
524 * voltagedomain @voltdm. Returns -EINVAL if presented with invalid
525 * pointers; or passes along the last return value of the callback
526 * function, which should be 0 for success or anything else to
529 int voltdm_for_each_pwrdm(struct voltagedomain *voltdm,
530 int (*fn)(struct voltagedomain *voltdm,
531 struct powerdomain *pwrdm))
533 struct powerdomain *pwrdm;
539 list_for_each_entry(pwrdm, &voltdm->pwrdm_list, voltdm_node)
540 ret = (*fn)(voltdm, pwrdm);
546 * voltdm_for_each - call function on each registered voltagedomain
547 * @fn: callback function *
549 * Call the supplied function @fn for each registered voltagedomain.
550 * The callback function @fn can return anything but 0 to bail out
551 * early from the iterator. Returns the last return value of the
552 * callback function, which should be 0 for success or anything else
553 * to indicate failure; or -EINVAL if the function pointer is null.
555 int voltdm_for_each(int (*fn)(struct voltagedomain *voltdm, void *user),
558 struct voltagedomain *temp_voltdm;
564 list_for_each_entry(temp_voltdm, &voltdm_list, node) {
565 ret = (*fn)(temp_voltdm, user);
573 static int _voltdm_register(struct voltagedomain *voltdm)
575 if (!voltdm || !voltdm->name)
578 INIT_LIST_HEAD(&voltdm->pwrdm_list);
579 list_add(&voltdm->node, &voltdm_list);
581 pr_debug("voltagedomain: registered %s\n", voltdm->name);
587 * voltdm_lookup - look up a voltagedomain by name, return a pointer
588 * @name: name of voltagedomain
590 * Find a registered voltagedomain by its name @name. Returns a pointer
591 * to the struct voltagedomain if found, or NULL otherwise.
593 struct voltagedomain *voltdm_lookup(const char *name)
595 struct voltagedomain *voltdm ;
600 voltdm = _voltdm_lookup(name);
606 * voltdm_init - set up the voltagedomain layer
607 * @voltdm_list: array of struct voltagedomain pointers to register
609 * Loop through the array of voltagedomains @voltdm_list, registering all
610 * that are available on the current CPU. If voltdm_list is supplied
611 * and not null, all of the referenced voltagedomains will be
612 * registered. No return value.
614 void voltdm_init(struct voltagedomain **voltdms)
616 struct voltagedomain **v;
619 for (v = voltdms; *v; v++)
620 _voltdm_register(*v);