Merge branch 'printk-rework' into for-linus
[linux-2.6-microblaze.git] / drivers / mfd / tps80031.c
1 /*
2  * tps80031.c -- TI TPS80031/TPS80032 mfd core driver.
3  *
4  * MFD core driver for TI TPS80031/TPS80032 Fully Integrated
5  * Power Management with Power Path and Battery Charger
6  *
7  * Copyright (c) 2012, NVIDIA Corporation.
8  *
9  * Author: Laxman Dewangan <ldewangan@nvidia.com>
10  *
11  * This program is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU General Public License as
13  * published by the Free Software Foundation version 2.
14  *
15  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
16  * whether express or implied; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23  * 02111-1307, USA
24  */
25
26 #include <linux/err.h>
27 #include <linux/i2c.h>
28 #include <linux/init.h>
29 #include <linux/interrupt.h>
30 #include <linux/irq.h>
31 #include <linux/mfd/core.h>
32 #include <linux/mfd/tps80031.h>
33 #include <linux/pm.h>
34 #include <linux/regmap.h>
35 #include <linux/slab.h>
36
37 static const struct resource tps80031_rtc_resources[] = {
38         {
39                 .start = TPS80031_INT_RTC_ALARM,
40                 .end = TPS80031_INT_RTC_ALARM,
41                 .flags = IORESOURCE_IRQ,
42         },
43 };
44
45 /* TPS80031 sub mfd devices */
46 static const struct mfd_cell tps80031_cell[] = {
47         {
48                 .name = "tps80031-pmic",
49         },
50         {
51                 .name = "tps80031-clock",
52         },
53         {
54                 .name = "tps80031-rtc",
55                 .num_resources = ARRAY_SIZE(tps80031_rtc_resources),
56                 .resources = tps80031_rtc_resources,
57         },
58         {
59                 .name = "tps80031-gpadc",
60         },
61         {
62                 .name = "tps80031-fuel-gauge",
63         },
64         {
65                 .name = "tps80031-charger",
66         },
67 };
68
69 static int tps80031_slave_address[TPS80031_NUM_SLAVES] = {
70         TPS80031_I2C_ID0_ADDR,
71         TPS80031_I2C_ID1_ADDR,
72         TPS80031_I2C_ID2_ADDR,
73         TPS80031_I2C_ID3_ADDR,
74 };
75
76 struct tps80031_pupd_data {
77         u8      reg;
78         u8      pullup_bit;
79         u8      pulldown_bit;
80 };
81
82 #define TPS80031_IRQ(_reg, _mask)                       \
83         {                                                       \
84                 .reg_offset = (TPS80031_INT_MSK_LINE_##_reg) -  \
85                                 TPS80031_INT_MSK_LINE_A,        \
86                 .mask = BIT(_mask),                             \
87         }
88
89 static const struct regmap_irq tps80031_main_irqs[] = {
90         [TPS80031_INT_PWRON]            = TPS80031_IRQ(A, 0),
91         [TPS80031_INT_RPWRON]           = TPS80031_IRQ(A, 1),
92         [TPS80031_INT_SYS_VLOW]         = TPS80031_IRQ(A, 2),
93         [TPS80031_INT_RTC_ALARM]        = TPS80031_IRQ(A, 3),
94         [TPS80031_INT_RTC_PERIOD]       = TPS80031_IRQ(A, 4),
95         [TPS80031_INT_HOT_DIE]          = TPS80031_IRQ(A, 5),
96         [TPS80031_INT_VXX_SHORT]        = TPS80031_IRQ(A, 6),
97         [TPS80031_INT_SPDURATION]       = TPS80031_IRQ(A, 7),
98         [TPS80031_INT_WATCHDOG]         = TPS80031_IRQ(B, 0),
99         [TPS80031_INT_BAT]              = TPS80031_IRQ(B, 1),
100         [TPS80031_INT_SIM]              = TPS80031_IRQ(B, 2),
101         [TPS80031_INT_MMC]              = TPS80031_IRQ(B, 3),
102         [TPS80031_INT_RES]              = TPS80031_IRQ(B, 4),
103         [TPS80031_INT_GPADC_RT]         = TPS80031_IRQ(B, 5),
104         [TPS80031_INT_GPADC_SW2_EOC]    = TPS80031_IRQ(B, 6),
105         [TPS80031_INT_CC_AUTOCAL]       = TPS80031_IRQ(B, 7),
106         [TPS80031_INT_ID_WKUP]          = TPS80031_IRQ(C, 0),
107         [TPS80031_INT_VBUSS_WKUP]       = TPS80031_IRQ(C, 1),
108         [TPS80031_INT_ID]               = TPS80031_IRQ(C, 2),
109         [TPS80031_INT_VBUS]             = TPS80031_IRQ(C, 3),
110         [TPS80031_INT_CHRG_CTRL]        = TPS80031_IRQ(C, 4),
111         [TPS80031_INT_EXT_CHRG]         = TPS80031_IRQ(C, 5),
112         [TPS80031_INT_INT_CHRG]         = TPS80031_IRQ(C, 6),
113         [TPS80031_INT_RES2]             = TPS80031_IRQ(C, 7),
114 };
115
116 static struct regmap_irq_chip tps80031_irq_chip = {
117         .name = "tps80031",
118         .irqs = tps80031_main_irqs,
119         .num_irqs = ARRAY_SIZE(tps80031_main_irqs),
120         .num_regs = 3,
121         .status_base = TPS80031_INT_STS_A,
122         .mask_base = TPS80031_INT_MSK_LINE_A,
123 };
124
125 #define PUPD_DATA(_reg, _pulldown_bit, _pullup_bit)     \
126         {                                               \
127                 .reg = TPS80031_CFG_INPUT_PUPD##_reg,   \
128                 .pulldown_bit = _pulldown_bit,          \
129                 .pullup_bit = _pullup_bit,              \
130         }
131
132 static const struct tps80031_pupd_data tps80031_pupds[] = {
133         [TPS80031_PREQ1]                = PUPD_DATA(1, BIT(0),  BIT(1)),
134         [TPS80031_PREQ2A]               = PUPD_DATA(1, BIT(2),  BIT(3)),
135         [TPS80031_PREQ2B]               = PUPD_DATA(1, BIT(4),  BIT(5)),
136         [TPS80031_PREQ2C]               = PUPD_DATA(1, BIT(6),  BIT(7)),
137         [TPS80031_PREQ3]                = PUPD_DATA(2, BIT(0),  BIT(1)),
138         [TPS80031_NRES_WARM]            = PUPD_DATA(2, 0,       BIT(2)),
139         [TPS80031_PWM_FORCE]            = PUPD_DATA(2, BIT(5),  0),
140         [TPS80031_CHRG_EXT_CHRG_STATZ]  = PUPD_DATA(2, 0,       BIT(6)),
141         [TPS80031_SIM]                  = PUPD_DATA(3, BIT(0),  BIT(1)),
142         [TPS80031_MMC]                  = PUPD_DATA(3, BIT(2),  BIT(3)),
143         [TPS80031_GPADC_START]          = PUPD_DATA(3, BIT(4),  0),
144         [TPS80031_DVSI2C_SCL]           = PUPD_DATA(4, 0,       BIT(0)),
145         [TPS80031_DVSI2C_SDA]           = PUPD_DATA(4, 0,       BIT(1)),
146         [TPS80031_CTLI2C_SCL]           = PUPD_DATA(4, 0,       BIT(2)),
147         [TPS80031_CTLI2C_SDA]           = PUPD_DATA(4, 0,       BIT(3)),
148 };
149 static struct tps80031 *tps80031_power_off_dev;
150
151 int tps80031_ext_power_req_config(struct device *dev,
152                 unsigned long ext_ctrl_flag, int preq_bit,
153                 int state_reg_add, int trans_reg_add)
154 {
155         u8 res_ass_reg = 0;
156         int preq_mask_bit = 0;
157         int ret;
158
159         if (!(ext_ctrl_flag & TPS80031_EXT_PWR_REQ))
160                 return 0;
161
162         if (ext_ctrl_flag & TPS80031_PWR_REQ_INPUT_PREQ1) {
163                 res_ass_reg = TPS80031_PREQ1_RES_ASS_A + (preq_bit >> 3);
164                 preq_mask_bit = 5;
165         } else if (ext_ctrl_flag & TPS80031_PWR_REQ_INPUT_PREQ2) {
166                 res_ass_reg = TPS80031_PREQ2_RES_ASS_A + (preq_bit >> 3);
167                 preq_mask_bit = 6;
168         } else if (ext_ctrl_flag & TPS80031_PWR_REQ_INPUT_PREQ3) {
169                 res_ass_reg = TPS80031_PREQ3_RES_ASS_A + (preq_bit >> 3);
170                 preq_mask_bit = 7;
171         }
172
173         /* Configure REQ_ASS registers */
174         ret = tps80031_set_bits(dev, TPS80031_SLAVE_ID1, res_ass_reg,
175                                         BIT(preq_bit & 0x7));
176         if (ret < 0) {
177                 dev_err(dev, "reg 0x%02x setbit failed, err = %d\n",
178                                 res_ass_reg, ret);
179                 return ret;
180         }
181
182         /* Unmask the PREQ */
183         ret = tps80031_clr_bits(dev, TPS80031_SLAVE_ID1,
184                         TPS80031_PHOENIX_MSK_TRANSITION, BIT(preq_mask_bit));
185         if (ret < 0) {
186                 dev_err(dev, "reg 0x%02x clrbit failed, err = %d\n",
187                         TPS80031_PHOENIX_MSK_TRANSITION, ret);
188                 return ret;
189         }
190
191         /* Switch regulator control to resource now */
192         if (ext_ctrl_flag & (TPS80031_PWR_REQ_INPUT_PREQ2 |
193                                         TPS80031_PWR_REQ_INPUT_PREQ3)) {
194                 ret = tps80031_update(dev, TPS80031_SLAVE_ID1, state_reg_add,
195                                                 0x0, TPS80031_STATE_MASK);
196                 if (ret < 0)
197                         dev_err(dev, "reg 0x%02x update failed, err = %d\n",
198                                 state_reg_add, ret);
199         } else {
200                 ret = tps80031_update(dev, TPS80031_SLAVE_ID1, trans_reg_add,
201                                 TPS80031_TRANS_SLEEP_OFF,
202                                 TPS80031_TRANS_SLEEP_MASK);
203                 if (ret < 0)
204                         dev_err(dev, "reg 0x%02x update failed, err = %d\n",
205                                 trans_reg_add, ret);
206         }
207         return ret;
208 }
209 EXPORT_SYMBOL_GPL(tps80031_ext_power_req_config);
210
211 static void tps80031_power_off(void)
212 {
213         dev_info(tps80031_power_off_dev->dev, "switching off PMU\n");
214         tps80031_write(tps80031_power_off_dev->dev, TPS80031_SLAVE_ID1,
215                                 TPS80031_PHOENIX_DEV_ON, TPS80031_DEVOFF);
216 }
217
218 static void tps80031_pupd_init(struct tps80031 *tps80031,
219                                struct tps80031_platform_data *pdata)
220 {
221         struct tps80031_pupd_init_data *pupd_init_data = pdata->pupd_init_data;
222         int data_size = pdata->pupd_init_data_size;
223         int i;
224
225         for (i = 0; i < data_size; ++i) {
226                 struct tps80031_pupd_init_data *pupd_init = &pupd_init_data[i];
227                 const struct tps80031_pupd_data *pupd =
228                         &tps80031_pupds[pupd_init->input_pin];
229                 u8 update_value = 0;
230                 u8 update_mask = pupd->pulldown_bit | pupd->pullup_bit;
231
232                 if (pupd_init->setting == TPS80031_PUPD_PULLDOWN)
233                         update_value = pupd->pulldown_bit;
234                 else if (pupd_init->setting == TPS80031_PUPD_PULLUP)
235                         update_value = pupd->pullup_bit;
236
237                 tps80031_update(tps80031->dev, TPS80031_SLAVE_ID1, pupd->reg,
238                                 update_value, update_mask);
239         }
240 }
241
242 static int tps80031_init_ext_control(struct tps80031 *tps80031,
243                         struct tps80031_platform_data *pdata)
244 {
245         struct device *dev = tps80031->dev;
246         int ret;
247         int i;
248
249         /* Clear all external control for this rail */
250         for (i = 0; i < 9; ++i) {
251                 ret = tps80031_write(dev, TPS80031_SLAVE_ID1,
252                                 TPS80031_PREQ1_RES_ASS_A + i, 0);
253                 if (ret < 0) {
254                         dev_err(dev, "reg 0x%02x write failed, err = %d\n",
255                                 TPS80031_PREQ1_RES_ASS_A + i, ret);
256                         return ret;
257                 }
258         }
259
260         /* Mask the PREQ */
261         ret = tps80031_set_bits(dev, TPS80031_SLAVE_ID1,
262                         TPS80031_PHOENIX_MSK_TRANSITION, 0x7 << 5);
263         if (ret < 0) {
264                 dev_err(dev, "reg 0x%02x set_bits failed, err = %d\n",
265                         TPS80031_PHOENIX_MSK_TRANSITION, ret);
266                 return ret;
267         }
268         return ret;
269 }
270
271 static int tps80031_irq_init(struct tps80031 *tps80031, int irq, int irq_base)
272 {
273         struct device *dev = tps80031->dev;
274         int i, ret;
275
276         /*
277          * The MASK register used for updating status register when
278          * interrupt occurs and LINE register used to pass the status
279          * to actual interrupt line.  As per datasheet:
280          * When INT_MSK_LINE [i] is set to 1, the associated interrupt
281          * number i is INT line masked, which means that no interrupt is
282          * generated on the INT line.
283          * When INT_MSK_LINE [i] is set to 0, the associated interrupt
284          * number i is  line enabled: An interrupt is generated on the
285          * INT line.
286          * In any case, the INT_STS [i] status bit may or may not be updated,
287          * only linked to the INT_MSK_STS [i] configuration register bit.
288          *
289          * When INT_MSK_STS [i] is set to 1, the associated interrupt number
290          * i is status masked, which means that no interrupt is stored in
291          * the INT_STS[i] status bit. Note that no interrupt number i is
292          * generated on the INT line, even if the INT_MSK_LINE [i] register
293          * bit is set to 0.
294          * When INT_MSK_STS [i] is set to 0, the associated interrupt number i
295          * is status enabled: An interrupt status is updated in the INT_STS [i]
296          * register. The interrupt may or may not be generated on the INT line,
297          * depending on the INT_MSK_LINE [i] configuration register bit.
298          */
299         for (i = 0; i < 3; i++)
300                 tps80031_write(dev, TPS80031_SLAVE_ID2,
301                                 TPS80031_INT_MSK_STS_A + i, 0x00);
302
303         ret = regmap_add_irq_chip(tps80031->regmap[TPS80031_SLAVE_ID2], irq,
304                         IRQF_ONESHOT, irq_base,
305                         &tps80031_irq_chip, &tps80031->irq_data);
306         if (ret < 0) {
307                 dev_err(dev, "add irq failed, err = %d\n", ret);
308                 return ret;
309         }
310         return ret;
311 }
312
313 static bool rd_wr_reg_id0(struct device *dev, unsigned int reg)
314 {
315         switch (reg) {
316         case TPS80031_SMPS1_CFG_FORCE ... TPS80031_SMPS2_CFG_VOLTAGE:
317                 return true;
318         default:
319                 return false;
320         }
321 }
322
323 static bool rd_wr_reg_id1(struct device *dev, unsigned int reg)
324 {
325         switch (reg) {
326         case TPS80031_SECONDS_REG ... TPS80031_RTC_RESET_STATUS_REG:
327         case TPS80031_VALIDITY0 ... TPS80031_VALIDITY7:
328         case TPS80031_PHOENIX_START_CONDITION ... TPS80031_KEY_PRESS_DUR_CFG:
329         case TPS80031_SMPS4_CFG_TRANS ... TPS80031_SMPS3_CFG_VOLTAGE:
330         case TPS80031_BROADCAST_ADDR_ALL ... TPS80031_BROADCAST_ADDR_CLK_RST:
331         case TPS80031_VANA_CFG_TRANS ... TPS80031_LDO7_CFG_VOLTAGE:
332         case TPS80031_REGEN1_CFG_TRANS ... TPS80031_TMP_CFG_STATE:
333         case TPS80031_PREQ1_RES_ASS_A ... TPS80031_PREQ3_RES_ASS_C:
334         case TPS80031_SMPS_OFFSET ... TPS80031_BATDEBOUNCING:
335         case TPS80031_CFG_INPUT_PUPD1 ... TPS80031_CFG_SMPS_PD:
336         case TPS80031_BACKUP_REG:
337                 return true;
338         default:
339                 return false;
340         }
341 }
342
343 static bool is_volatile_reg_id1(struct device *dev, unsigned int reg)
344 {
345         switch (reg) {
346         case TPS80031_SMPS4_CFG_TRANS ... TPS80031_SMPS3_CFG_VOLTAGE:
347         case TPS80031_VANA_CFG_TRANS ... TPS80031_LDO7_CFG_VOLTAGE:
348         case TPS80031_REGEN1_CFG_TRANS ... TPS80031_TMP_CFG_STATE:
349         case TPS80031_PREQ1_RES_ASS_A ... TPS80031_PREQ3_RES_ASS_C:
350         case TPS80031_SMPS_OFFSET ... TPS80031_BATDEBOUNCING:
351         case TPS80031_CFG_INPUT_PUPD1 ... TPS80031_CFG_SMPS_PD:
352                 return true;
353         default:
354                 return false;
355         }
356 }
357
358 static bool rd_wr_reg_id2(struct device *dev, unsigned int reg)
359 {
360         switch (reg) {
361         case TPS80031_USB_VENDOR_ID_LSB ... TPS80031_USB_OTG_REVISION:
362         case TPS80031_GPADC_CTRL ... TPS80031_CTRL_P1:
363         case TPS80031_RTCH0_LSB ... TPS80031_GPCH0_MSB:
364         case TPS80031_TOGGLE1 ... TPS80031_VIBMODE:
365         case TPS80031_PWM1ON ... TPS80031_PWM2OFF:
366         case TPS80031_FG_REG_00 ... TPS80031_FG_REG_11:
367         case TPS80031_INT_STS_A ... TPS80031_INT_MSK_STS_C:
368         case TPS80031_CONTROLLER_CTRL2 ... TPS80031_LED_PWM_CTRL2:
369                 return true;
370         default:
371                 return false;
372         }
373 }
374
375 static bool rd_wr_reg_id3(struct device *dev, unsigned int reg)
376 {
377         switch (reg) {
378         case TPS80031_GPADC_TRIM0 ... TPS80031_GPADC_TRIM18:
379                 return true;
380         default:
381                 return false;
382         }
383 }
384
385 static const struct regmap_config tps80031_regmap_configs[] = {
386         {
387                 .reg_bits = 8,
388                 .val_bits = 8,
389                 .writeable_reg = rd_wr_reg_id0,
390                 .readable_reg = rd_wr_reg_id0,
391                 .max_register = TPS80031_MAX_REGISTER,
392         },
393         {
394                 .reg_bits = 8,
395                 .val_bits = 8,
396                 .writeable_reg = rd_wr_reg_id1,
397                 .readable_reg = rd_wr_reg_id1,
398                 .volatile_reg = is_volatile_reg_id1,
399                 .max_register = TPS80031_MAX_REGISTER,
400         },
401         {
402                 .reg_bits = 8,
403                 .val_bits = 8,
404                 .writeable_reg = rd_wr_reg_id2,
405                 .readable_reg = rd_wr_reg_id2,
406                 .max_register = TPS80031_MAX_REGISTER,
407         },
408         {
409                 .reg_bits = 8,
410                 .val_bits = 8,
411                 .writeable_reg = rd_wr_reg_id3,
412                 .readable_reg = rd_wr_reg_id3,
413                 .max_register = TPS80031_MAX_REGISTER,
414         },
415 };
416
417 static int tps80031_probe(struct i2c_client *client,
418                           const struct i2c_device_id *id)
419 {
420         struct tps80031_platform_data *pdata = dev_get_platdata(&client->dev);
421         struct tps80031 *tps80031;
422         int ret;
423         uint8_t es_version;
424         uint8_t ep_ver;
425         int i;
426
427         if (!pdata) {
428                 dev_err(&client->dev, "tps80031 requires platform data\n");
429                 return -EINVAL;
430         }
431
432         tps80031 = devm_kzalloc(&client->dev, sizeof(*tps80031), GFP_KERNEL);
433         if (!tps80031)
434                 return -ENOMEM;
435
436         for (i = 0; i < TPS80031_NUM_SLAVES; i++) {
437                 if (tps80031_slave_address[i] == client->addr)
438                         tps80031->clients[i] = client;
439                 else
440                         tps80031->clients[i] = devm_i2c_new_dummy_device(&client->dev,
441                                                 client->adapter, tps80031_slave_address[i]);
442                 if (IS_ERR(tps80031->clients[i])) {
443                         dev_err(&client->dev, "can't attach client %d\n", i);
444                         return PTR_ERR(tps80031->clients[i]);
445                 }
446
447                 i2c_set_clientdata(tps80031->clients[i], tps80031);
448                 tps80031->regmap[i] = devm_regmap_init_i2c(tps80031->clients[i],
449                                         &tps80031_regmap_configs[i]);
450                 if (IS_ERR(tps80031->regmap[i])) {
451                         ret = PTR_ERR(tps80031->regmap[i]);
452                         dev_err(&client->dev,
453                                 "regmap %d init failed, err %d\n", i, ret);
454                         return ret;
455                 }
456         }
457
458         ret = tps80031_read(&client->dev, TPS80031_SLAVE_ID3,
459                         TPS80031_JTAGVERNUM, &es_version);
460         if (ret < 0) {
461                 dev_err(&client->dev,
462                         "Silicon version number read failed: %d\n", ret);
463                 return ret;
464         }
465
466         ret = tps80031_read(&client->dev, TPS80031_SLAVE_ID3,
467                         TPS80031_EPROM_REV, &ep_ver);
468         if (ret < 0) {
469                 dev_err(&client->dev,
470                         "Silicon eeprom version read failed: %d\n", ret);
471                 return ret;
472         }
473
474         dev_info(&client->dev, "ES version 0x%02x and EPROM version 0x%02x\n",
475                                         es_version, ep_ver);
476         tps80031->es_version = es_version;
477         tps80031->dev = &client->dev;
478         i2c_set_clientdata(client, tps80031);
479         tps80031->chip_info = id->driver_data;
480
481         ret = tps80031_irq_init(tps80031, client->irq, pdata->irq_base);
482         if (ret) {
483                 dev_err(&client->dev, "IRQ init failed: %d\n", ret);
484                 return ret;
485         }
486
487         tps80031_pupd_init(tps80031, pdata);
488
489         tps80031_init_ext_control(tps80031, pdata);
490
491         ret = mfd_add_devices(tps80031->dev, -1,
492                         tps80031_cell, ARRAY_SIZE(tps80031_cell),
493                         NULL, 0,
494                         regmap_irq_get_domain(tps80031->irq_data));
495         if (ret < 0) {
496                 dev_err(&client->dev, "mfd_add_devices failed: %d\n", ret);
497                 goto fail_mfd_add;
498         }
499
500         if (pdata->use_power_off && !pm_power_off) {
501                 tps80031_power_off_dev = tps80031;
502                 pm_power_off = tps80031_power_off;
503         }
504         return 0;
505
506 fail_mfd_add:
507         regmap_del_irq_chip(client->irq, tps80031->irq_data);
508         return ret;
509 }
510
511 static const struct i2c_device_id tps80031_id_table[] = {
512         { "tps80031", TPS80031 },
513         { "tps80032", TPS80032 },
514         { }
515 };
516
517 static struct i2c_driver tps80031_driver = {
518         .driver = {
519                 .name                   = "tps80031",
520                 .suppress_bind_attrs    = true,
521         },
522         .probe          = tps80031_probe,
523         .id_table       = tps80031_id_table,
524 };
525
526 static int __init tps80031_init(void)
527 {
528         return i2c_add_driver(&tps80031_driver);
529 }
530 subsys_initcall(tps80031_init);