Root/drivers/regulator/tps62360-regulator.c

1/*
2 * tps62360.c -- TI tps62360
3 *
4 * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
5 *
6 * Copyright (c) 2012, NVIDIA Corporation.
7 *
8 * Author: Laxman Dewangan <ldewangan@nvidia.com>
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 version 2.
13 *
14 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
15 * whether express or implied; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 * 02111-1307, USA
23 */
24
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/init.h>
28#include <linux/err.h>
29#include <linux/of.h>
30#include <linux/of_device.h>
31#include <linux/of_gpio.h>
32#include <linux/regulator/of_regulator.h>
33#include <linux/platform_device.h>
34#include <linux/regulator/driver.h>
35#include <linux/regulator/machine.h>
36#include <linux/regulator/tps62360.h>
37#include <linux/gpio.h>
38#include <linux/i2c.h>
39#include <linux/slab.h>
40#include <linux/regmap.h>
41
42/* Register definitions */
43#define REG_VSET0 0
44#define REG_VSET1 1
45#define REG_VSET2 2
46#define REG_VSET3 3
47#define REG_CONTROL 4
48#define REG_TEMP 5
49#define REG_RAMPCTRL 6
50#define REG_CHIPID 8
51
52#define FORCE_PWM_ENABLE BIT(7)
53
54enum chips {TPS62360, TPS62361, TPS62362, TPS62363};
55
56#define TPS62360_BASE_VOLTAGE 770000
57#define TPS62360_N_VOLTAGES 64
58
59#define TPS62361_BASE_VOLTAGE 500000
60#define TPS62361_N_VOLTAGES 128
61
62/* tps 62360 chip information */
63struct tps62360_chip {
64    struct device *dev;
65    struct regulator_desc desc;
66    struct regulator_dev *rdev;
67    struct regmap *regmap;
68    int vsel0_gpio;
69    int vsel1_gpio;
70    u8 voltage_reg_mask;
71    bool en_internal_pulldn;
72    bool en_discharge;
73    bool valid_gpios;
74    int lru_index[4];
75    int curr_vset_vsel[4];
76    int curr_vset_id;
77};
78
79/*
80 * find_voltage_set_register: Find new voltage configuration register
81 * (VSET) id.
82 * The finding of the new VSET register will be based on the LRU mechanism.
83 * Each VSET register will have different voltage configured . This
84 * Function will look if any of the VSET register have requested voltage set
85 * or not.
86 * - If it is already there then it will make that register as most
87 * recently used and return as found so that caller need not to set
88 * the VSET register but need to set the proper gpios to select this
89 * VSET register.
90 * - If requested voltage is not found then it will use the least
91 * recently mechanism to get new VSET register for new configuration
92 * and will return not_found so that caller need to set new VSET
93 * register and then gpios (both).
94 */
95static bool find_voltage_set_register(struct tps62360_chip *tps,
96        int req_vsel, int *vset_reg_id)
97{
98    int i;
99    bool found = false;
100    int new_vset_reg = tps->lru_index[3];
101    int found_index = 3;
102
103    for (i = 0; i < 4; ++i) {
104        if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
105            new_vset_reg = tps->lru_index[i];
106            found_index = i;
107            found = true;
108            goto update_lru_index;
109        }
110    }
111
112update_lru_index:
113    for (i = found_index; i > 0; i--)
114        tps->lru_index[i] = tps->lru_index[i - 1];
115
116    tps->lru_index[0] = new_vset_reg;
117    *vset_reg_id = new_vset_reg;
118    return found;
119}
120
121static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)
122{
123    struct tps62360_chip *tps = rdev_get_drvdata(dev);
124    int vsel;
125    unsigned int data;
126    int ret;
127
128    ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
129    if (ret < 0) {
130        dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
131            __func__, REG_VSET0 + tps->curr_vset_id, ret);
132        return ret;
133    }
134    vsel = (int)data & tps->voltage_reg_mask;
135    return vsel;
136}
137
138static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
139                     unsigned selector)
140{
141    struct tps62360_chip *tps = rdev_get_drvdata(dev);
142    int ret;
143    bool found = false;
144    int new_vset_id = tps->curr_vset_id;
145
146    /*
147     * If gpios are available to select the VSET register then least
148     * recently used register for new configuration.
149     */
150    if (tps->valid_gpios)
151        found = find_voltage_set_register(tps, selector, &new_vset_id);
152
153    if (!found) {
154        ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
155                tps->voltage_reg_mask, selector);
156        if (ret < 0) {
157            dev_err(tps->dev,
158                "%s(): register %d update failed with err %d\n",
159                 __func__, REG_VSET0 + new_vset_id, ret);
160            return ret;
161        }
162        tps->curr_vset_id = new_vset_id;
163        tps->curr_vset_vsel[new_vset_id] = selector;
164    }
165
166    /* Select proper VSET register vio gpios */
167    if (tps->valid_gpios) {
168        gpio_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);
169        gpio_set_value_cansleep(tps->vsel1_gpio,
170                    (new_vset_id >> 1) & 0x1);
171    }
172    return 0;
173}
174
175static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)
176{
177    struct tps62360_chip *tps = rdev_get_drvdata(rdev);
178    int i;
179    int val;
180    int ret;
181
182    /* Enable force PWM mode in FAST mode only. */
183    switch (mode) {
184    case REGULATOR_MODE_FAST:
185        val = FORCE_PWM_ENABLE;
186        break;
187
188    case REGULATOR_MODE_NORMAL:
189        val = 0;
190        break;
191
192    default:
193        return -EINVAL;
194    }
195
196    if (!tps->valid_gpios) {
197        ret = regmap_update_bits(tps->regmap,
198            REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
199        if (ret < 0)
200            dev_err(tps->dev,
201                "%s(): register %d update failed with err %d\n",
202                __func__, REG_VSET0 + tps->curr_vset_id, ret);
203        return ret;
204    }
205
206    /* If gpios are valid then all register set need to be control */
207    for (i = 0; i < 4; ++i) {
208        ret = regmap_update_bits(tps->regmap,
209                    REG_VSET0 + i, FORCE_PWM_ENABLE, val);
210        if (ret < 0) {
211            dev_err(tps->dev,
212                "%s(): register %d update failed with err %d\n",
213                __func__, REG_VSET0 + i, ret);
214            return ret;
215        }
216    }
217    return ret;
218}
219
220static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
221{
222    struct tps62360_chip *tps = rdev_get_drvdata(rdev);
223    unsigned int data;
224    int ret;
225
226    ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
227    if (ret < 0) {
228        dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
229            __func__, REG_VSET0 + tps->curr_vset_id, ret);
230        return ret;
231    }
232    return (data & FORCE_PWM_ENABLE) ?
233                REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
234}
235
236static struct regulator_ops tps62360_dcdc_ops = {
237    .get_voltage_sel = tps62360_dcdc_get_voltage_sel,
238    .set_voltage_sel = tps62360_dcdc_set_voltage_sel,
239    .list_voltage = regulator_list_voltage_linear,
240    .map_voltage = regulator_map_voltage_linear,
241    .set_voltage_time_sel = regulator_set_voltage_time_sel,
242    .set_mode = tps62360_set_mode,
243    .get_mode = tps62360_get_mode,
244};
245
246static int __devinit tps62360_init_dcdc(struct tps62360_chip *tps,
247        struct tps62360_regulator_platform_data *pdata)
248{
249    int ret;
250    unsigned int ramp_ctrl;
251
252    /* Initialize internal pull up/down control */
253    if (tps->en_internal_pulldn)
254        ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
255    else
256        ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
257    if (ret < 0) {
258        dev_err(tps->dev,
259            "%s(): register %d write failed with err %d\n",
260            __func__, REG_CONTROL, ret);
261        return ret;
262    }
263
264    /* Reset output discharge path to reduce power consumption */
265    ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
266    if (ret < 0) {
267        dev_err(tps->dev,
268            "%s(): register %d update failed with err %d\n",
269            __func__, REG_RAMPCTRL, ret);
270        return ret;
271    }
272
273    /* Get ramp value from ramp control register */
274    ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
275    if (ret < 0) {
276        dev_err(tps->dev,
277            "%s(): register %d read failed with err %d\n",
278            __func__, REG_RAMPCTRL, ret);
279        return ret;
280    }
281    ramp_ctrl = (ramp_ctrl >> 4) & 0x7;
282
283    /* ramp mV/us = 32/(2^ramp_ctrl) */
284    tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
285    return ret;
286}
287
288static const struct regmap_config tps62360_regmap_config = {
289    .reg_bits = 8,
290    .val_bits = 8,
291    .max_register = REG_CHIPID,
292    .cache_type = REGCACHE_RBTREE,
293};
294
295static struct tps62360_regulator_platform_data *
296    of_get_tps62360_platform_data(struct device *dev)
297{
298    struct tps62360_regulator_platform_data *pdata;
299    struct device_node *np = dev->of_node;
300
301    pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
302    if (!pdata) {
303        dev_err(dev, "Memory alloc failed for platform data\n");
304        return NULL;
305    }
306
307    pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
308    if (!pdata->reg_init_data) {
309        dev_err(dev, "Not able to get OF regulator init data\n");
310        return NULL;
311    }
312
313    pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0);
314    pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0);
315
316    if (of_find_property(np, "ti,vsel0-state-high", NULL))
317        pdata->vsel0_def_state = 1;
318
319    if (of_find_property(np, "ti,vsel1-state-high", NULL))
320        pdata->vsel1_def_state = 1;
321
322    if (of_find_property(np, "ti,enable-pull-down", NULL))
323        pdata->en_internal_pulldn = true;
324
325    if (of_find_property(np, "ti,enable-vout-discharge", NULL))
326        pdata->en_discharge = true;
327
328    return pdata;
329}
330
331#if defined(CONFIG_OF)
332static const struct of_device_id tps62360_of_match[] = {
333     { .compatible = "ti,tps62360", .data = (void *)TPS62360},
334     { .compatible = "ti,tps62361", .data = (void *)TPS62361},
335     { .compatible = "ti,tps62362", .data = (void *)TPS62362},
336     { .compatible = "ti,tps62363", .data = (void *)TPS62363},
337    {},
338};
339MODULE_DEVICE_TABLE(of, tps62360_of_match);
340#endif
341
342static int __devinit tps62360_probe(struct i2c_client *client,
343                     const struct i2c_device_id *id)
344{
345    struct regulator_config config = { };
346    struct tps62360_regulator_platform_data *pdata;
347    struct regulator_dev *rdev;
348    struct tps62360_chip *tps;
349    int ret;
350    int i;
351    int chip_id;
352
353    pdata = client->dev.platform_data;
354    chip_id = id->driver_data;
355
356    if (client->dev.of_node) {
357        const struct of_device_id *match;
358        match = of_match_device(of_match_ptr(tps62360_of_match),
359                &client->dev);
360        if (!match) {
361            dev_err(&client->dev, "Error: No device match found\n");
362            return -ENODEV;
363        }
364        chip_id = (int)match->data;
365        if (!pdata)
366            pdata = of_get_tps62360_platform_data(&client->dev);
367    }
368
369    if (!pdata) {
370        dev_err(&client->dev, "%s(): Platform data not found\n",
371                        __func__);
372        return -EIO;
373    }
374
375    tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
376    if (!tps) {
377        dev_err(&client->dev, "%s(): Memory allocation failed\n",
378                        __func__);
379        return -ENOMEM;
380    }
381
382    tps->en_discharge = pdata->en_discharge;
383    tps->en_internal_pulldn = pdata->en_internal_pulldn;
384    tps->vsel0_gpio = pdata->vsel0_gpio;
385    tps->vsel1_gpio = pdata->vsel1_gpio;
386    tps->dev = &client->dev;
387
388    switch (chip_id) {
389    case TPS62360:
390    case TPS62362:
391        tps->desc.min_uV = TPS62360_BASE_VOLTAGE;
392        tps->voltage_reg_mask = 0x3F;
393        tps->desc.n_voltages = TPS62360_N_VOLTAGES;
394        break;
395    case TPS62361:
396    case TPS62363:
397        tps->desc.min_uV = TPS62361_BASE_VOLTAGE;
398        tps->voltage_reg_mask = 0x7F;
399        tps->desc.n_voltages = TPS62361_N_VOLTAGES;
400        break;
401    default:
402        return -ENODEV;
403    }
404
405    tps->desc.name = id->name;
406    tps->desc.id = 0;
407    tps->desc.ops = &tps62360_dcdc_ops;
408    tps->desc.type = REGULATOR_VOLTAGE;
409    tps->desc.owner = THIS_MODULE;
410    tps->desc.uV_step = 10000;
411
412    tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
413    if (IS_ERR(tps->regmap)) {
414        ret = PTR_ERR(tps->regmap);
415        dev_err(&client->dev,
416            "%s(): regmap allocation failed with err %d\n",
417            __func__, ret);
418        return ret;
419    }
420    i2c_set_clientdata(client, tps);
421
422    tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
423                (pdata->vsel0_def_state & 1);
424    tps->lru_index[0] = tps->curr_vset_id;
425    tps->valid_gpios = false;
426
427    if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {
428        int gpio_flags;
429        gpio_flags = (pdata->vsel0_def_state) ?
430                GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
431        ret = devm_gpio_request_one(&client->dev, tps->vsel0_gpio,
432                gpio_flags, "tps62360-vsel0");
433        if (ret) {
434            dev_err(&client->dev,
435                "%s(): Could not obtain vsel0 GPIO %d: %d\n",
436                __func__, tps->vsel0_gpio, ret);
437            return ret;
438        }
439
440        gpio_flags = (pdata->vsel1_def_state) ?
441                GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
442        ret = devm_gpio_request_one(&client->dev, tps->vsel1_gpio,
443                gpio_flags, "tps62360-vsel1");
444        if (ret) {
445            dev_err(&client->dev,
446                "%s(): Could not obtain vsel1 GPIO %d: %d\n",
447                __func__, tps->vsel1_gpio, ret);
448            return ret;
449        }
450        tps->valid_gpios = true;
451
452        /*
453         * Initialize the lru index with vset_reg id
454         * The index 0 will be most recently used and
455         * set with the tps->curr_vset_id */
456        for (i = 0; i < 4; ++i)
457            tps->lru_index[i] = i;
458        tps->lru_index[0] = tps->curr_vset_id;
459        tps->lru_index[tps->curr_vset_id] = 0;
460    }
461
462    ret = tps62360_init_dcdc(tps, pdata);
463    if (ret < 0) {
464        dev_err(tps->dev, "%s(): Init failed with err = %d\n",
465                __func__, ret);
466        return ret;
467    }
468
469    config.dev = &client->dev;
470    config.init_data = pdata->reg_init_data;
471    config.driver_data = tps;
472    config.of_node = client->dev.of_node;
473
474    /* Register the regulators */
475    rdev = regulator_register(&tps->desc, &config);
476    if (IS_ERR(rdev)) {
477        dev_err(tps->dev,
478            "%s(): regulator register failed with err %s\n",
479            __func__, id->name);
480        return PTR_ERR(rdev);
481    }
482
483    tps->rdev = rdev;
484    return 0;
485}
486
487/**
488 * tps62360_remove - tps62360 driver i2c remove handler
489 * @client: i2c driver client device structure
490 *
491 * Unregister TPS driver as an i2c client device driver
492 */
493static int __devexit tps62360_remove(struct i2c_client *client)
494{
495    struct tps62360_chip *tps = i2c_get_clientdata(client);
496
497    regulator_unregister(tps->rdev);
498    return 0;
499}
500
501static void tps62360_shutdown(struct i2c_client *client)
502{
503    struct tps62360_chip *tps = i2c_get_clientdata(client);
504    int st;
505
506    if (!tps->en_discharge)
507        return;
508
509    /* Configure the output discharge path */
510    st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
511    if (st < 0)
512        dev_err(tps->dev,
513            "%s(): register %d update failed with err %d\n",
514            __func__, REG_RAMPCTRL, st);
515}
516
517static const struct i2c_device_id tps62360_id[] = {
518    {.name = "tps62360", .driver_data = TPS62360},
519    {.name = "tps62361", .driver_data = TPS62361},
520    {.name = "tps62362", .driver_data = TPS62362},
521    {.name = "tps62363", .driver_data = TPS62363},
522    {},
523};
524
525MODULE_DEVICE_TABLE(i2c, tps62360_id);
526
527static struct i2c_driver tps62360_i2c_driver = {
528    .driver = {
529        .name = "tps62360",
530        .owner = THIS_MODULE,
531        .of_match_table = of_match_ptr(tps62360_of_match),
532    },
533    .probe = tps62360_probe,
534    .remove = __devexit_p(tps62360_remove),
535    .shutdown = tps62360_shutdown,
536    .id_table = tps62360_id,
537};
538
539static int __init tps62360_init(void)
540{
541    return i2c_add_driver(&tps62360_i2c_driver);
542}
543subsys_initcall(tps62360_init);
544
545static void __exit tps62360_cleanup(void)
546{
547    i2c_del_driver(&tps62360_i2c_driver);
548}
549module_exit(tps62360_cleanup);
550
551MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
552MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
553MODULE_LICENSE("GPL v2");
554

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jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master

Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9



interactive