kill mm argument of vm_munmap()
[~shefty/rdma-dev.git] / drivers / mfd / twl6040-core.c
1 /*
2  * MFD driver for TWL6040 audio device
3  *
4  * Authors:     Misael Lopez Cruz <misael.lopez@ti.com>
5  *              Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
6  *              Peter Ujfalusi <peter.ujfalusi@ti.com>
7  *
8  * Copyright:   (C) 2011 Texas Instruments, Inc.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; 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., 51 Franklin St, Fifth Floor, Boston, MA
22  * 02110-1301 USA
23  *
24  */
25
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/slab.h>
29 #include <linux/kernel.h>
30 #include <linux/platform_device.h>
31 #include <linux/gpio.h>
32 #include <linux/delay.h>
33 #include <linux/i2c/twl.h>
34 #include <linux/mfd/core.h>
35 #include <linux/mfd/twl6040.h>
36
37 #define VIBRACTRL_MEMBER(reg) ((reg == TWL6040_REG_VIBCTLL) ? 0 : 1)
38
39 int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg)
40 {
41         int ret;
42         u8 val = 0;
43
44         mutex_lock(&twl6040->io_mutex);
45         /* Vibra control registers from cache */
46         if (unlikely(reg == TWL6040_REG_VIBCTLL ||
47                      reg == TWL6040_REG_VIBCTLR)) {
48                 val = twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)];
49         } else {
50                 ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
51                 if (ret < 0) {
52                         mutex_unlock(&twl6040->io_mutex);
53                         return ret;
54                 }
55         }
56         mutex_unlock(&twl6040->io_mutex);
57
58         return val;
59 }
60 EXPORT_SYMBOL(twl6040_reg_read);
61
62 int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val)
63 {
64         int ret;
65
66         mutex_lock(&twl6040->io_mutex);
67         ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
68         /* Cache the vibra control registers */
69         if (reg == TWL6040_REG_VIBCTLL || reg == TWL6040_REG_VIBCTLR)
70                 twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)] = val;
71         mutex_unlock(&twl6040->io_mutex);
72
73         return ret;
74 }
75 EXPORT_SYMBOL(twl6040_reg_write);
76
77 int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
78 {
79         int ret;
80         u8 val;
81
82         mutex_lock(&twl6040->io_mutex);
83         ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
84         if (ret)
85                 goto out;
86
87         val |= mask;
88         ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
89 out:
90         mutex_unlock(&twl6040->io_mutex);
91         return ret;
92 }
93 EXPORT_SYMBOL(twl6040_set_bits);
94
95 int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
96 {
97         int ret;
98         u8 val;
99
100         mutex_lock(&twl6040->io_mutex);
101         ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
102         if (ret)
103                 goto out;
104
105         val &= ~mask;
106         ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
107 out:
108         mutex_unlock(&twl6040->io_mutex);
109         return ret;
110 }
111 EXPORT_SYMBOL(twl6040_clear_bits);
112
113 /* twl6040 codec manual power-up sequence */
114 static int twl6040_power_up(struct twl6040 *twl6040)
115 {
116         u8 ldoctl, ncpctl, lppllctl;
117         int ret;
118
119         /* enable high-side LDO, reference system and internal oscillator */
120         ldoctl = TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA;
121         ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
122         if (ret)
123                 return ret;
124         usleep_range(10000, 10500);
125
126         /* enable negative charge pump */
127         ncpctl = TWL6040_NCPENA;
128         ret = twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
129         if (ret)
130                 goto ncp_err;
131         usleep_range(1000, 1500);
132
133         /* enable low-side LDO */
134         ldoctl |= TWL6040_LSLDOENA;
135         ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
136         if (ret)
137                 goto lsldo_err;
138         usleep_range(1000, 1500);
139
140         /* enable low-power PLL */
141         lppllctl = TWL6040_LPLLENA;
142         ret = twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
143         if (ret)
144                 goto lppll_err;
145         usleep_range(5000, 5500);
146
147         /* disable internal oscillator */
148         ldoctl &= ~TWL6040_OSCENA;
149         ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
150         if (ret)
151                 goto osc_err;
152
153         return 0;
154
155 osc_err:
156         lppllctl &= ~TWL6040_LPLLENA;
157         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
158 lppll_err:
159         ldoctl &= ~TWL6040_LSLDOENA;
160         twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
161 lsldo_err:
162         ncpctl &= ~TWL6040_NCPENA;
163         twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
164 ncp_err:
165         ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
166         twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
167
168         return ret;
169 }
170
171 /* twl6040 manual power-down sequence */
172 static void twl6040_power_down(struct twl6040 *twl6040)
173 {
174         u8 ncpctl, ldoctl, lppllctl;
175
176         ncpctl = twl6040_reg_read(twl6040, TWL6040_REG_NCPCTL);
177         ldoctl = twl6040_reg_read(twl6040, TWL6040_REG_LDOCTL);
178         lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
179
180         /* enable internal oscillator */
181         ldoctl |= TWL6040_OSCENA;
182         twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
183         usleep_range(1000, 1500);
184
185         /* disable low-power PLL */
186         lppllctl &= ~TWL6040_LPLLENA;
187         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
188
189         /* disable low-side LDO */
190         ldoctl &= ~TWL6040_LSLDOENA;
191         twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
192
193         /* disable negative charge pump */
194         ncpctl &= ~TWL6040_NCPENA;
195         twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
196
197         /* disable high-side LDO, reference system and internal oscillator */
198         ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
199         twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
200 }
201
202 static irqreturn_t twl6040_naudint_handler(int irq, void *data)
203 {
204         struct twl6040 *twl6040 = data;
205         u8 intid, status;
206
207         intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
208
209         if (intid & TWL6040_READYINT)
210                 complete(&twl6040->ready);
211
212         if (intid & TWL6040_THINT) {
213                 status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
214                 if (status & TWL6040_TSHUTDET) {
215                         dev_warn(twl6040->dev,
216                                  "Thermal shutdown, powering-off");
217                         twl6040_power(twl6040, 0);
218                 } else {
219                         dev_warn(twl6040->dev,
220                                  "Leaving thermal shutdown, powering-on");
221                         twl6040_power(twl6040, 1);
222                 }
223         }
224
225         return IRQ_HANDLED;
226 }
227
228 static int twl6040_power_up_completion(struct twl6040 *twl6040,
229                                        int naudint)
230 {
231         int time_left;
232         u8 intid;
233
234         time_left = wait_for_completion_timeout(&twl6040->ready,
235                                                 msecs_to_jiffies(144));
236         if (!time_left) {
237                 intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
238                 if (!(intid & TWL6040_READYINT)) {
239                         dev_err(twl6040->dev,
240                                 "timeout waiting for READYINT\n");
241                         return -ETIMEDOUT;
242                 }
243         }
244
245         return 0;
246 }
247
248 int twl6040_power(struct twl6040 *twl6040, int on)
249 {
250         int audpwron = twl6040->audpwron;
251         int naudint = twl6040->irq;
252         int ret = 0;
253
254         mutex_lock(&twl6040->mutex);
255
256         if (on) {
257                 /* already powered-up */
258                 if (twl6040->power_count++)
259                         goto out;
260
261                 if (gpio_is_valid(audpwron)) {
262                         /* use AUDPWRON line */
263                         gpio_set_value(audpwron, 1);
264                         /* wait for power-up completion */
265                         ret = twl6040_power_up_completion(twl6040, naudint);
266                         if (ret) {
267                                 dev_err(twl6040->dev,
268                                         "automatic power-down failed\n");
269                                 twl6040->power_count = 0;
270                                 goto out;
271                         }
272                 } else {
273                         /* use manual power-up sequence */
274                         ret = twl6040_power_up(twl6040);
275                         if (ret) {
276                                 dev_err(twl6040->dev,
277                                         "manual power-up failed\n");
278                                 twl6040->power_count = 0;
279                                 goto out;
280                         }
281                 }
282                 /* Default PLL configuration after power up */
283                 twl6040->pll = TWL6040_SYSCLK_SEL_LPPLL;
284                 twl6040->sysclk = 19200000;
285                 twl6040->mclk = 32768;
286         } else {
287                 /* already powered-down */
288                 if (!twl6040->power_count) {
289                         dev_err(twl6040->dev,
290                                 "device is already powered-off\n");
291                         ret = -EPERM;
292                         goto out;
293                 }
294
295                 if (--twl6040->power_count)
296                         goto out;
297
298                 if (gpio_is_valid(audpwron)) {
299                         /* use AUDPWRON line */
300                         gpio_set_value(audpwron, 0);
301
302                         /* power-down sequence latency */
303                         usleep_range(500, 700);
304                 } else {
305                         /* use manual power-down sequence */
306                         twl6040_power_down(twl6040);
307                 }
308                 twl6040->sysclk = 0;
309                 twl6040->mclk = 0;
310         }
311
312 out:
313         mutex_unlock(&twl6040->mutex);
314         return ret;
315 }
316 EXPORT_SYMBOL(twl6040_power);
317
318 int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
319                     unsigned int freq_in, unsigned int freq_out)
320 {
321         u8 hppllctl, lppllctl;
322         int ret = 0;
323
324         mutex_lock(&twl6040->mutex);
325
326         hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL);
327         lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
328
329         /* Force full reconfiguration when switching between PLL */
330         if (pll_id != twl6040->pll) {
331                 twl6040->sysclk = 0;
332                 twl6040->mclk = 0;
333         }
334
335         switch (pll_id) {
336         case TWL6040_SYSCLK_SEL_LPPLL:
337                 /* low-power PLL divider */
338                 /* Change the sysclk configuration only if it has been canged */
339                 if (twl6040->sysclk != freq_out) {
340                         switch (freq_out) {
341                         case 17640000:
342                                 lppllctl |= TWL6040_LPLLFIN;
343                                 break;
344                         case 19200000:
345                                 lppllctl &= ~TWL6040_LPLLFIN;
346                                 break;
347                         default:
348                                 dev_err(twl6040->dev,
349                                         "freq_out %d not supported\n",
350                                         freq_out);
351                                 ret = -EINVAL;
352                                 goto pll_out;
353                         }
354                         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
355                                           lppllctl);
356                 }
357
358                 /* The PLL in use has not been change, we can exit */
359                 if (twl6040->pll == pll_id)
360                         break;
361
362                 switch (freq_in) {
363                 case 32768:
364                         lppllctl |= TWL6040_LPLLENA;
365                         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
366                                           lppllctl);
367                         mdelay(5);
368                         lppllctl &= ~TWL6040_HPLLSEL;
369                         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
370                                           lppllctl);
371                         hppllctl &= ~TWL6040_HPLLENA;
372                         twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
373                                           hppllctl);
374                         break;
375                 default:
376                         dev_err(twl6040->dev,
377                                 "freq_in %d not supported\n", freq_in);
378                         ret = -EINVAL;
379                         goto pll_out;
380                 }
381                 break;
382         case TWL6040_SYSCLK_SEL_HPPLL:
383                 /* high-performance PLL can provide only 19.2 MHz */
384                 if (freq_out != 19200000) {
385                         dev_err(twl6040->dev,
386                                 "freq_out %d not supported\n", freq_out);
387                         ret = -EINVAL;
388                         goto pll_out;
389                 }
390
391                 if (twl6040->mclk != freq_in) {
392                         hppllctl &= ~TWL6040_MCLK_MSK;
393
394                         switch (freq_in) {
395                         case 12000000:
396                                 /* PLL enabled, active mode */
397                                 hppllctl |= TWL6040_MCLK_12000KHZ |
398                                             TWL6040_HPLLENA;
399                                 break;
400                         case 19200000:
401                                 /*
402                                 * PLL disabled
403                                 * (enable PLL if MCLK jitter quality
404                                 *  doesn't meet specification)
405                                 */
406                                 hppllctl |= TWL6040_MCLK_19200KHZ;
407                                 break;
408                         case 26000000:
409                                 /* PLL enabled, active mode */
410                                 hppllctl |= TWL6040_MCLK_26000KHZ |
411                                             TWL6040_HPLLENA;
412                                 break;
413                         case 38400000:
414                                 /* PLL enabled, active mode */
415                                 hppllctl |= TWL6040_MCLK_38400KHZ |
416                                             TWL6040_HPLLENA;
417                                 break;
418                         default:
419                                 dev_err(twl6040->dev,
420                                         "freq_in %d not supported\n", freq_in);
421                                 ret = -EINVAL;
422                                 goto pll_out;
423                         }
424
425                         /*
426                          * enable clock slicer to ensure input waveform is
427                          * square
428                          */
429                         hppllctl |= TWL6040_HPLLSQRENA;
430
431                         twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
432                                           hppllctl);
433                         usleep_range(500, 700);
434                         lppllctl |= TWL6040_HPLLSEL;
435                         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
436                                           lppllctl);
437                         lppllctl &= ~TWL6040_LPLLENA;
438                         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
439                                           lppllctl);
440                 }
441                 break;
442         default:
443                 dev_err(twl6040->dev, "unknown pll id %d\n", pll_id);
444                 ret = -EINVAL;
445                 goto pll_out;
446         }
447
448         twl6040->sysclk = freq_out;
449         twl6040->mclk = freq_in;
450         twl6040->pll = pll_id;
451
452 pll_out:
453         mutex_unlock(&twl6040->mutex);
454         return ret;
455 }
456 EXPORT_SYMBOL(twl6040_set_pll);
457
458 int twl6040_get_pll(struct twl6040 *twl6040)
459 {
460         if (twl6040->power_count)
461                 return twl6040->pll;
462         else
463                 return -ENODEV;
464 }
465 EXPORT_SYMBOL(twl6040_get_pll);
466
467 unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
468 {
469         return twl6040->sysclk;
470 }
471 EXPORT_SYMBOL(twl6040_get_sysclk);
472
473 /* Get the combined status of the vibra control register */
474 int twl6040_get_vibralr_status(struct twl6040 *twl6040)
475 {
476         u8 status;
477
478         status = twl6040->vibra_ctrl_cache[0] | twl6040->vibra_ctrl_cache[1];
479         status &= (TWL6040_VIBENA | TWL6040_VIBSEL);
480
481         return status;
482 }
483 EXPORT_SYMBOL(twl6040_get_vibralr_status);
484
485 static struct resource twl6040_vibra_rsrc[] = {
486         {
487                 .flags = IORESOURCE_IRQ,
488         },
489 };
490
491 static struct resource twl6040_codec_rsrc[] = {
492         {
493                 .flags = IORESOURCE_IRQ,
494         },
495 };
496
497 static int __devinit twl6040_probe(struct platform_device *pdev)
498 {
499         struct twl4030_audio_data *pdata = pdev->dev.platform_data;
500         struct twl6040 *twl6040;
501         struct mfd_cell *cell = NULL;
502         int ret, children = 0;
503
504         if (!pdata) {
505                 dev_err(&pdev->dev, "Platform data is missing\n");
506                 return -EINVAL;
507         }
508
509         /* In order to operate correctly we need valid interrupt config */
510         if (!pdata->naudint_irq || !pdata->irq_base) {
511                 dev_err(&pdev->dev, "Invalid IRQ configuration\n");
512                 return -EINVAL;
513         }
514
515         twl6040 = kzalloc(sizeof(struct twl6040), GFP_KERNEL);
516         if (!twl6040)
517                 return -ENOMEM;
518
519         platform_set_drvdata(pdev, twl6040);
520
521         twl6040->dev = &pdev->dev;
522         twl6040->irq = pdata->naudint_irq;
523         twl6040->irq_base = pdata->irq_base;
524
525         mutex_init(&twl6040->mutex);
526         mutex_init(&twl6040->io_mutex);
527         init_completion(&twl6040->ready);
528
529         twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV);
530
531         /* ERRATA: Automatic power-up is not possible in ES1.0 */
532         if (twl6040_get_revid(twl6040) > TWL6040_REV_ES1_0)
533                 twl6040->audpwron = pdata->audpwron_gpio;
534         else
535                 twl6040->audpwron = -EINVAL;
536
537         if (gpio_is_valid(twl6040->audpwron)) {
538                 ret = gpio_request_one(twl6040->audpwron, GPIOF_OUT_INIT_LOW,
539                                        "audpwron");
540                 if (ret)
541                         goto gpio1_err;
542         }
543
544         /* codec interrupt */
545         ret = twl6040_irq_init(twl6040);
546         if (ret)
547                 goto gpio2_err;
548
549         ret = request_threaded_irq(twl6040->irq_base + TWL6040_IRQ_READY,
550                                    NULL, twl6040_naudint_handler, 0,
551                                    "twl6040_irq_ready", twl6040);
552         if (ret) {
553                 dev_err(twl6040->dev, "READY IRQ request failed: %d\n",
554                         ret);
555                 goto irq_err;
556         }
557
558         /* dual-access registers controlled by I2C only */
559         twl6040_set_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_I2CSEL);
560
561         if (pdata->codec) {
562                 int irq = twl6040->irq_base + TWL6040_IRQ_PLUG;
563
564                 cell = &twl6040->cells[children];
565                 cell->name = "twl6040-codec";
566                 twl6040_codec_rsrc[0].start = irq;
567                 twl6040_codec_rsrc[0].end = irq;
568                 cell->resources = twl6040_codec_rsrc;
569                 cell->num_resources = ARRAY_SIZE(twl6040_codec_rsrc);
570                 cell->platform_data = pdata->codec;
571                 cell->pdata_size = sizeof(*pdata->codec);
572                 children++;
573         }
574
575         if (pdata->vibra) {
576                 int irq = twl6040->irq_base + TWL6040_IRQ_VIB;
577
578                 cell = &twl6040->cells[children];
579                 cell->name = "twl6040-vibra";
580                 twl6040_vibra_rsrc[0].start = irq;
581                 twl6040_vibra_rsrc[0].end = irq;
582                 cell->resources = twl6040_vibra_rsrc;
583                 cell->num_resources = ARRAY_SIZE(twl6040_vibra_rsrc);
584
585                 cell->platform_data = pdata->vibra;
586                 cell->pdata_size = sizeof(*pdata->vibra);
587                 children++;
588         }
589
590         if (children) {
591                 ret = mfd_add_devices(&pdev->dev, pdev->id, twl6040->cells,
592                                       children, NULL, 0);
593                 if (ret)
594                         goto mfd_err;
595         } else {
596                 dev_err(&pdev->dev, "No platform data found for children\n");
597                 ret = -ENODEV;
598                 goto mfd_err;
599         }
600
601         return 0;
602
603 mfd_err:
604         free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
605 irq_err:
606         twl6040_irq_exit(twl6040);
607 gpio2_err:
608         if (gpio_is_valid(twl6040->audpwron))
609                 gpio_free(twl6040->audpwron);
610 gpio1_err:
611         platform_set_drvdata(pdev, NULL);
612         kfree(twl6040);
613         return ret;
614 }
615
616 static int __devexit twl6040_remove(struct platform_device *pdev)
617 {
618         struct twl6040 *twl6040 = platform_get_drvdata(pdev);
619
620         if (twl6040->power_count)
621                 twl6040_power(twl6040, 0);
622
623         if (gpio_is_valid(twl6040->audpwron))
624                 gpio_free(twl6040->audpwron);
625
626         free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
627         twl6040_irq_exit(twl6040);
628
629         mfd_remove_devices(&pdev->dev);
630         platform_set_drvdata(pdev, NULL);
631         kfree(twl6040);
632
633         return 0;
634 }
635
636 static struct platform_driver twl6040_driver = {
637         .probe          = twl6040_probe,
638         .remove         = __devexit_p(twl6040_remove),
639         .driver         = {
640                 .owner  = THIS_MODULE,
641                 .name   = "twl6040",
642         },
643 };
644
645 module_platform_driver(twl6040_driver);
646
647 MODULE_DESCRIPTION("TWL6040 MFD");
648 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
649 MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
650 MODULE_LICENSE("GPL");
651 MODULE_ALIAS("platform:twl6040");