aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mfd/twl4030-core.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mfd/twl4030-core.c')
-rw-r--r--drivers/mfd/twl4030-core.c1193
1 files changed, 1193 insertions, 0 deletions
diff --git a/drivers/mfd/twl4030-core.c b/drivers/mfd/twl4030-core.c
new file mode 100644
index 000000000000..fd9a0160202c
--- /dev/null
+++ b/drivers/mfd/twl4030-core.c
@@ -0,0 +1,1193 @@
1/*
2 * twl4030_core.c - driver for TWL4030/TPS659x0 PM and audio CODEC devices
3 *
4 * Copyright (C) 2005-2006 Texas Instruments, Inc.
5 *
6 * Modifications to defer interrupt handling to a kernel thread:
7 * Copyright (C) 2006 MontaVista Software, Inc.
8 *
9 * Based on tlv320aic23.c:
10 * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
11 *
12 * Code cleanup and modifications to IRQ handler.
13 * by syed khasim <x0khasim@ti.com>
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 */
29
30#include <linux/kernel_stat.h>
31#include <linux/init.h>
32#include <linux/mutex.h>
33#include <linux/interrupt.h>
34#include <linux/irq.h>
35#include <linux/random.h>
36#include <linux/kthread.h>
37#include <linux/platform_device.h>
38#include <linux/clk.h>
39
40#include <linux/i2c.h>
41#include <linux/i2c/twl4030.h>
42
43
44/*
45 * The TWL4030 "Triton 2" is one of a family of a multi-function "Power
46 * Management and System Companion Device" chips originally designed for
47 * use in OMAP2 and OMAP 3 based systems. Its control interfaces use I2C,
48 * often at around 3 Mbit/sec, including for interrupt handling.
49 *
50 * This driver core provides genirq support for the interrupts emitted,
51 * by the various modules, and exports register access primitives.
52 *
53 * FIXME this driver currently requires use of the first interrupt line
54 * (and associated registers).
55 */
56
57#define DRIVER_NAME "twl4030"
58
59#if defined(CONFIG_TWL4030_BCI_BATTERY) || \
60 defined(CONFIG_TWL4030_BCI_BATTERY_MODULE)
61#define twl_has_bci() true
62#else
63#define twl_has_bci() false
64#endif
65
66#if defined(CONFIG_KEYBOARD_TWL4030) || defined(CONFIG_KEYBOARD_TWL4030_MODULE)
67#define twl_has_keypad() true
68#else
69#define twl_has_keypad() false
70#endif
71
72#if defined(CONFIG_GPIO_TWL4030) || defined(CONFIG_GPIO_TWL4030_MODULE)
73#define twl_has_gpio() true
74#else
75#define twl_has_gpio() false
76#endif
77
78#if defined(CONFIG_TWL4030_MADC) || defined(CONFIG_TWL4030_MADC_MODULE)
79#define twl_has_madc() true
80#else
81#define twl_has_madc() false
82#endif
83
84#if defined(CONFIG_RTC_DRV_TWL4030) || defined(CONFIG_RTC_DRV_TWL4030_MODULE)
85#define twl_has_rtc() true
86#else
87#define twl_has_rtc() false
88#endif
89
90#if defined(CONFIG_TWL4030_USB) || defined(CONFIG_TWL4030_USB_MODULE)
91#define twl_has_usb() true
92#else
93#define twl_has_usb() false
94#endif
95
96static inline void activate_irq(int irq)
97{
98#ifdef CONFIG_ARM
99 /* ARM requires an extra step to clear IRQ_NOREQUEST, which it
100 * sets on behalf of every irq_chip. Also sets IRQ_NOPROBE.
101 */
102 set_irq_flags(irq, IRQF_VALID);
103#else
104 /* same effect on other architectures */
105 set_irq_noprobe(irq);
106#endif
107}
108
109/* Primary Interrupt Handler on TWL4030 Registers */
110
111/* Register Definitions */
112
113#define REG_PIH_ISR_P1 (0x1)
114#define REG_PIH_ISR_P2 (0x2)
115#define REG_PIH_SIR (0x3)
116
117/* Triton Core internal information (BEGIN) */
118
119/* Last - for index max*/
120#define TWL4030_MODULE_LAST TWL4030_MODULE_SECURED_REG
121
122#define TWL4030_NUM_SLAVES 4
123
124
125/* Base Address defns for twl4030_map[] */
126
127/* subchip/slave 0 - USB ID */
128#define TWL4030_BASEADD_USB 0x0000
129
130/* subchip/slave 1 - AUD ID */
131#define TWL4030_BASEADD_AUDIO_VOICE 0x0000
132#define TWL4030_BASEADD_GPIO 0x0098
133#define TWL4030_BASEADD_INTBR 0x0085
134#define TWL4030_BASEADD_PIH 0x0080
135#define TWL4030_BASEADD_TEST 0x004C
136
137/* subchip/slave 2 - AUX ID */
138#define TWL4030_BASEADD_INTERRUPTS 0x00B9
139#define TWL4030_BASEADD_LED 0x00EE
140#define TWL4030_BASEADD_MADC 0x0000
141#define TWL4030_BASEADD_MAIN_CHARGE 0x0074
142#define TWL4030_BASEADD_PRECHARGE 0x00AA
143#define TWL4030_BASEADD_PWM0 0x00F8
144#define TWL4030_BASEADD_PWM1 0x00FB
145#define TWL4030_BASEADD_PWMA 0x00EF
146#define TWL4030_BASEADD_PWMB 0x00F1
147#define TWL4030_BASEADD_KEYPAD 0x00D2
148
149/* subchip/slave 3 - POWER ID */
150#define TWL4030_BASEADD_BACKUP 0x0014
151#define TWL4030_BASEADD_INT 0x002E
152#define TWL4030_BASEADD_PM_MASTER 0x0036
153#define TWL4030_BASEADD_PM_RECEIVER 0x005B
154#define TWL4030_BASEADD_RTC 0x001C
155#define TWL4030_BASEADD_SECURED_REG 0x0000
156
157/* Triton Core internal information (END) */
158
159
160/* Few power values */
161#define R_CFG_BOOT 0x05
162#define R_PROTECT_KEY 0x0E
163
164/* access control values for R_PROTECT_KEY */
165#define KEY_UNLOCK1 0xce
166#define KEY_UNLOCK2 0xec
167#define KEY_LOCK 0x00
168
169/* some fields in R_CFG_BOOT */
170#define HFCLK_FREQ_19p2_MHZ (1 << 0)
171#define HFCLK_FREQ_26_MHZ (2 << 0)
172#define HFCLK_FREQ_38p4_MHZ (3 << 0)
173#define HIGH_PERF_SQ (1 << 3)
174
175
176/*----------------------------------------------------------------------*/
177
178/**
179 * struct twl4030_mod_iregs - TWL module IMR/ISR regs to mask/clear at init
180 * @mod_no: TWL4030 module number (e.g., TWL4030_MODULE_GPIO)
181 * @sih_ctrl: address of module SIH_CTRL register
182 * @reg_cnt: number of IMR/ISR regs
183 * @imrs: pointer to array of TWL module interrupt mask register indices
184 * @isrs: pointer to array of TWL module interrupt status register indices
185 *
186 * Ties together TWL4030 modules and lists of IMR/ISR registers to mask/clear
187 * during twl_init_irq().
188 */
189struct twl4030_mod_iregs {
190 const u8 mod_no;
191 const u8 sih_ctrl;
192 const u8 reg_cnt;
193 const u8 *imrs;
194 const u8 *isrs;
195};
196
197/* TWL4030 INT module interrupt mask registers */
198static const u8 __initconst twl4030_int_imr_regs[] = {
199 TWL4030_INT_PWR_IMR1,
200 TWL4030_INT_PWR_IMR2,
201};
202
203/* TWL4030 INT module interrupt status registers */
204static const u8 __initconst twl4030_int_isr_regs[] = {
205 TWL4030_INT_PWR_ISR1,
206 TWL4030_INT_PWR_ISR2,
207};
208
209/* TWL4030 INTERRUPTS module interrupt mask registers */
210static const u8 __initconst twl4030_interrupts_imr_regs[] = {
211 TWL4030_INTERRUPTS_BCIIMR1A,
212 TWL4030_INTERRUPTS_BCIIMR1B,
213 TWL4030_INTERRUPTS_BCIIMR2A,
214 TWL4030_INTERRUPTS_BCIIMR2B,
215};
216
217/* TWL4030 INTERRUPTS module interrupt status registers */
218static const u8 __initconst twl4030_interrupts_isr_regs[] = {
219 TWL4030_INTERRUPTS_BCIISR1A,
220 TWL4030_INTERRUPTS_BCIISR1B,
221 TWL4030_INTERRUPTS_BCIISR2A,
222 TWL4030_INTERRUPTS_BCIISR2B,
223};
224
225/* TWL4030 MADC module interrupt mask registers */
226static const u8 __initconst twl4030_madc_imr_regs[] = {
227 TWL4030_MADC_IMR1,
228 TWL4030_MADC_IMR2,
229};
230
231/* TWL4030 MADC module interrupt status registers */
232static const u8 __initconst twl4030_madc_isr_regs[] = {
233 TWL4030_MADC_ISR1,
234 TWL4030_MADC_ISR2,
235};
236
237/* TWL4030 keypad module interrupt mask registers */
238static const u8 __initconst twl4030_keypad_imr_regs[] = {
239 TWL4030_KEYPAD_KEYP_IMR1,
240 TWL4030_KEYPAD_KEYP_IMR2,
241};
242
243/* TWL4030 keypad module interrupt status registers */
244static const u8 __initconst twl4030_keypad_isr_regs[] = {
245 TWL4030_KEYPAD_KEYP_ISR1,
246 TWL4030_KEYPAD_KEYP_ISR2,
247};
248
249/* TWL4030 GPIO module interrupt mask registers */
250static const u8 __initconst twl4030_gpio_imr_regs[] = {
251 REG_GPIO_IMR1A,
252 REG_GPIO_IMR1B,
253 REG_GPIO_IMR2A,
254 REG_GPIO_IMR2B,
255 REG_GPIO_IMR3A,
256 REG_GPIO_IMR3B,
257};
258
259/* TWL4030 GPIO module interrupt status registers */
260static const u8 __initconst twl4030_gpio_isr_regs[] = {
261 REG_GPIO_ISR1A,
262 REG_GPIO_ISR1B,
263 REG_GPIO_ISR2A,
264 REG_GPIO_ISR2B,
265 REG_GPIO_ISR3A,
266 REG_GPIO_ISR3B,
267};
268
269/* TWL4030 modules that have IMR/ISR registers that must be masked/cleared */
270static const struct twl4030_mod_iregs __initconst twl4030_mod_regs[] = {
271 {
272 .mod_no = TWL4030_MODULE_INT,
273 .sih_ctrl = TWL4030_INT_PWR_SIH_CTRL,
274 .reg_cnt = ARRAY_SIZE(twl4030_int_imr_regs),
275 .imrs = twl4030_int_imr_regs,
276 .isrs = twl4030_int_isr_regs,
277 },
278 {
279 .mod_no = TWL4030_MODULE_INTERRUPTS,
280 .sih_ctrl = TWL4030_INTERRUPTS_BCISIHCTRL,
281 .reg_cnt = ARRAY_SIZE(twl4030_interrupts_imr_regs),
282 .imrs = twl4030_interrupts_imr_regs,
283 .isrs = twl4030_interrupts_isr_regs,
284 },
285 {
286 .mod_no = TWL4030_MODULE_MADC,
287 .sih_ctrl = TWL4030_MADC_SIH_CTRL,
288 .reg_cnt = ARRAY_SIZE(twl4030_madc_imr_regs),
289 .imrs = twl4030_madc_imr_regs,
290 .isrs = twl4030_madc_isr_regs,
291 },
292 {
293 .mod_no = TWL4030_MODULE_KEYPAD,
294 .sih_ctrl = TWL4030_KEYPAD_KEYP_SIH_CTRL,
295 .reg_cnt = ARRAY_SIZE(twl4030_keypad_imr_regs),
296 .imrs = twl4030_keypad_imr_regs,
297 .isrs = twl4030_keypad_isr_regs,
298 },
299 {
300 .mod_no = TWL4030_MODULE_GPIO,
301 .sih_ctrl = REG_GPIO_SIH_CTRL,
302 .reg_cnt = ARRAY_SIZE(twl4030_gpio_imr_regs),
303 .imrs = twl4030_gpio_imr_regs,
304 .isrs = twl4030_gpio_isr_regs,
305 },
306};
307
308/*----------------------------------------------------------------*/
309
310/* is driver active, bound to a chip? */
311static bool inuse;
312
313/* Structure for each TWL4030 Slave */
314struct twl4030_client {
315 struct i2c_client *client;
316 u8 address;
317
318 /* max numb of i2c_msg required is for read =2 */
319 struct i2c_msg xfer_msg[2];
320
321 /* To lock access to xfer_msg */
322 struct mutex xfer_lock;
323};
324
325static struct twl4030_client twl4030_modules[TWL4030_NUM_SLAVES];
326
327
328/* mapping the module id to slave id and base address */
329struct twl4030mapping {
330 unsigned char sid; /* Slave ID */
331 unsigned char base; /* base address */
332};
333
334static struct twl4030mapping twl4030_map[TWL4030_MODULE_LAST + 1] = {
335 /*
336 * NOTE: don't change this table without updating the
337 * <linux/i2c/twl4030.h> defines for TWL4030_MODULE_*
338 * so they continue to match the order in this table.
339 */
340
341 { 0, TWL4030_BASEADD_USB },
342
343 { 1, TWL4030_BASEADD_AUDIO_VOICE },
344 { 1, TWL4030_BASEADD_GPIO },
345 { 1, TWL4030_BASEADD_INTBR },
346 { 1, TWL4030_BASEADD_PIH },
347 { 1, TWL4030_BASEADD_TEST },
348
349 { 2, TWL4030_BASEADD_KEYPAD },
350 { 2, TWL4030_BASEADD_MADC },
351 { 2, TWL4030_BASEADD_INTERRUPTS },
352 { 2, TWL4030_BASEADD_LED },
353 { 2, TWL4030_BASEADD_MAIN_CHARGE },
354 { 2, TWL4030_BASEADD_PRECHARGE },
355 { 2, TWL4030_BASEADD_PWM0 },
356 { 2, TWL4030_BASEADD_PWM1 },
357 { 2, TWL4030_BASEADD_PWMA },
358 { 2, TWL4030_BASEADD_PWMB },
359
360 { 3, TWL4030_BASEADD_BACKUP },
361 { 3, TWL4030_BASEADD_INT },
362 { 3, TWL4030_BASEADD_PM_MASTER },
363 { 3, TWL4030_BASEADD_PM_RECEIVER },
364 { 3, TWL4030_BASEADD_RTC },
365 { 3, TWL4030_BASEADD_SECURED_REG },
366};
367
368/*----------------------------------------------------------------------*/
369
370/*
371 * TWL4030 doesn't have PIH mask, hence dummy function for mask
372 * and unmask of the (eight) interrupts reported at that level ...
373 * masking is only available from SIH (secondary) modules.
374 */
375
376static void twl4030_i2c_ackirq(unsigned int irq)
377{
378}
379
380static void twl4030_i2c_disableint(unsigned int irq)
381{
382}
383
384static void twl4030_i2c_enableint(unsigned int irq)
385{
386}
387
388static struct irq_chip twl4030_irq_chip = {
389 .name = "twl4030",
390 .ack = twl4030_i2c_ackirq,
391 .mask = twl4030_i2c_disableint,
392 .unmask = twl4030_i2c_enableint,
393};
394
395/*----------------------------------------------------------------------*/
396
397/* Exported Functions */
398
399/**
400 * twl4030_i2c_write - Writes a n bit register in TWL4030
401 * @mod_no: module number
402 * @value: an array of num_bytes+1 containing data to write
403 * @reg: register address (just offset will do)
404 * @num_bytes: number of bytes to transfer
405 *
406 * IMPORTANT: for 'value' parameter: Allocate value num_bytes+1 and
407 * valid data starts at Offset 1.
408 *
409 * Returns the result of operation - 0 is success
410 */
411int twl4030_i2c_write(u8 mod_no, u8 *value, u8 reg, u8 num_bytes)
412{
413 int ret;
414 int sid;
415 struct twl4030_client *twl;
416 struct i2c_msg *msg;
417
418 if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
419 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
420 return -EPERM;
421 }
422 sid = twl4030_map[mod_no].sid;
423 twl = &twl4030_modules[sid];
424
425 if (unlikely(!inuse)) {
426 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
427 return -EPERM;
428 }
429 mutex_lock(&twl->xfer_lock);
430 /*
431 * [MSG1]: fill the register address data
432 * fill the data Tx buffer
433 */
434 msg = &twl->xfer_msg[0];
435 msg->addr = twl->address;
436 msg->len = num_bytes + 1;
437 msg->flags = 0;
438 msg->buf = value;
439 /* over write the first byte of buffer with the register address */
440 *value = twl4030_map[mod_no].base + reg;
441 ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 1);
442 mutex_unlock(&twl->xfer_lock);
443
444 /* i2cTransfer returns num messages.translate it pls.. */
445 if (ret >= 0)
446 ret = 0;
447 return ret;
448}
449EXPORT_SYMBOL(twl4030_i2c_write);
450
451/**
452 * twl4030_i2c_read - Reads a n bit register in TWL4030
453 * @mod_no: module number
454 * @value: an array of num_bytes containing data to be read
455 * @reg: register address (just offset will do)
456 * @num_bytes: number of bytes to transfer
457 *
458 * Returns result of operation - num_bytes is success else failure.
459 */
460int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, u8 num_bytes)
461{
462 int ret;
463 u8 val;
464 int sid;
465 struct twl4030_client *twl;
466 struct i2c_msg *msg;
467
468 if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
469 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
470 return -EPERM;
471 }
472 sid = twl4030_map[mod_no].sid;
473 twl = &twl4030_modules[sid];
474
475 if (unlikely(!inuse)) {
476 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
477 return -EPERM;
478 }
479 mutex_lock(&twl->xfer_lock);
480 /* [MSG1] fill the register address data */
481 msg = &twl->xfer_msg[0];
482 msg->addr = twl->address;
483 msg->len = 1;
484 msg->flags = 0; /* Read the register value */
485 val = twl4030_map[mod_no].base + reg;
486 msg->buf = &val;
487 /* [MSG2] fill the data rx buffer */
488 msg = &twl->xfer_msg[1];
489 msg->addr = twl->address;
490 msg->flags = I2C_M_RD; /* Read the register value */
491 msg->len = num_bytes; /* only n bytes */
492 msg->buf = value;
493 ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2);
494 mutex_unlock(&twl->xfer_lock);
495
496 /* i2cTransfer returns num messages.translate it pls.. */
497 if (ret >= 0)
498 ret = 0;
499 return ret;
500}
501EXPORT_SYMBOL(twl4030_i2c_read);
502
503/**
504 * twl4030_i2c_write_u8 - Writes a 8 bit register in TWL4030
505 * @mod_no: module number
506 * @value: the value to be written 8 bit
507 * @reg: register address (just offset will do)
508 *
509 * Returns result of operation - 0 is success
510 */
511int twl4030_i2c_write_u8(u8 mod_no, u8 value, u8 reg)
512{
513
514 /* 2 bytes offset 1 contains the data offset 0 is used by i2c_write */
515 u8 temp_buffer[2] = { 0 };
516 /* offset 1 contains the data */
517 temp_buffer[1] = value;
518 return twl4030_i2c_write(mod_no, temp_buffer, reg, 1);
519}
520EXPORT_SYMBOL(twl4030_i2c_write_u8);
521
522/**
523 * twl4030_i2c_read_u8 - Reads a 8 bit register from TWL4030
524 * @mod_no: module number
525 * @value: the value read 8 bit
526 * @reg: register address (just offset will do)
527 *
528 * Returns result of operation - 0 is success
529 */
530int twl4030_i2c_read_u8(u8 mod_no, u8 *value, u8 reg)
531{
532 return twl4030_i2c_read(mod_no, value, reg, 1);
533}
534EXPORT_SYMBOL(twl4030_i2c_read_u8);
535
536/*----------------------------------------------------------------------*/
537
538static unsigned twl4030_irq_base;
539
540static struct completion irq_event;
541
542/*
543 * This thread processes interrupts reported by the Primary Interrupt Handler.
544 */
545static int twl4030_irq_thread(void *data)
546{
547 long irq = (long)data;
548 irq_desc_t *desc = irq_desc + irq;
549 static unsigned i2c_errors;
550 const static unsigned max_i2c_errors = 100;
551
552 current->flags |= PF_NOFREEZE;
553
554 while (!kthread_should_stop()) {
555 int ret;
556 int module_irq;
557 u8 pih_isr;
558
559 /* Wait for IRQ, then read PIH irq status (also blocking) */
560 wait_for_completion_interruptible(&irq_event);
561
562 ret = twl4030_i2c_read_u8(TWL4030_MODULE_PIH, &pih_isr,
563 REG_PIH_ISR_P1);
564 if (ret) {
565 pr_warning("%s: I2C error %d reading PIH ISR\n",
566 DRIVER_NAME, ret);
567 if (++i2c_errors >= max_i2c_errors) {
568 printk(KERN_ERR "Maximum I2C error count"
569 " exceeded. Terminating %s.\n",
570 __func__);
571 break;
572 }
573 complete(&irq_event);
574 continue;
575 }
576
577 /* these handlers deal with the relevant SIH irq status */
578 local_irq_disable();
579 for (module_irq = twl4030_irq_base;
580 pih_isr;
581 pih_isr >>= 1, module_irq++) {
582 if (pih_isr & 0x1) {
583 irq_desc_t *d = irq_desc + module_irq;
584
585 d->handle_irq(module_irq, d);
586 }
587 }
588 local_irq_enable();
589
590 desc->chip->unmask(irq);
591 }
592
593 return 0;
594}
595
596/*
597 * do_twl4030_irq() is the desc->handle method for the twl4030 interrupt.
598 * This is a chained interrupt, so there is no desc->action method for it.
599 * Now we need to query the interrupt controller in the twl4030 to determine
600 * which module is generating the interrupt request. However, we can't do i2c
601 * transactions in interrupt context, so we must defer that work to a kernel
602 * thread. All we do here is acknowledge and mask the interrupt and wakeup
603 * the kernel thread.
604 */
605static void do_twl4030_irq(unsigned int irq, irq_desc_t *desc)
606{
607 const unsigned int cpu = smp_processor_id();
608
609 /*
610 * Earlier this was desc->triggered = 1;
611 */
612 desc->status |= IRQ_LEVEL;
613
614 /*
615 * Acknowledge, clear _AND_ disable the interrupt.
616 */
617 desc->chip->ack(irq);
618
619 if (!desc->depth) {
620 kstat_cpu(cpu).irqs[irq]++;
621
622 complete(&irq_event);
623 }
624}
625
626static struct task_struct * __init start_twl4030_irq_thread(long irq)
627{
628 struct task_struct *thread;
629
630 init_completion(&irq_event);
631 thread = kthread_run(twl4030_irq_thread, (void *)irq, "twl4030-irq");
632 if (!thread)
633 pr_err("%s: could not create twl4030 irq %ld thread!\n",
634 DRIVER_NAME, irq);
635
636 return thread;
637}
638
639/*----------------------------------------------------------------------*/
640
641static int add_children(struct twl4030_platform_data *pdata)
642{
643 struct platform_device *pdev = NULL;
644 struct twl4030_client *twl = NULL;
645 int status = 0;
646
647 if (twl_has_bci() && pdata->bci) {
648 twl = &twl4030_modules[3];
649
650 pdev = platform_device_alloc("twl4030_bci", -1);
651 if (!pdev) {
652 pr_debug("%s: can't alloc bci dev\n", DRIVER_NAME);
653 status = -ENOMEM;
654 goto err;
655 }
656
657 if (status == 0) {
658 pdev->dev.parent = &twl->client->dev;
659 status = platform_device_add_data(pdev, pdata->bci,
660 sizeof(*pdata->bci));
661 if (status < 0) {
662 dev_dbg(&twl->client->dev,
663 "can't add bci data, %d\n",
664 status);
665 goto err;
666 }
667 }
668
669 if (status == 0) {
670 struct resource r = {
671 .start = TWL4030_PWRIRQ_CHG_PRES,
672 .flags = IORESOURCE_IRQ,
673 };
674
675 status = platform_device_add_resources(pdev, &r, 1);
676 }
677
678 if (status == 0)
679 status = platform_device_add(pdev);
680
681 if (status < 0) {
682 platform_device_put(pdev);
683 dev_dbg(&twl->client->dev,
684 "can't create bci dev, %d\n",
685 status);
686 goto err;
687 }
688 }
689
690 if (twl_has_gpio() && pdata->gpio) {
691 twl = &twl4030_modules[1];
692
693 pdev = platform_device_alloc("twl4030_gpio", -1);
694 if (!pdev) {
695 pr_debug("%s: can't alloc gpio dev\n", DRIVER_NAME);
696 status = -ENOMEM;
697 goto err;
698 }
699
700 /* more driver model init */
701 if (status == 0) {
702 pdev->dev.parent = &twl->client->dev;
703 /* device_init_wakeup(&pdev->dev, 1); */
704
705 status = platform_device_add_data(pdev, pdata->gpio,
706 sizeof(*pdata->gpio));
707 if (status < 0) {
708 dev_dbg(&twl->client->dev,
709 "can't add gpio data, %d\n",
710 status);
711 goto err;
712 }
713 }
714
715 /* GPIO module IRQ */
716 if (status == 0) {
717 struct resource r = {
718 .start = pdata->irq_base + 0,
719 .flags = IORESOURCE_IRQ,
720 };
721
722 status = platform_device_add_resources(pdev, &r, 1);
723 }
724
725 if (status == 0)
726 status = platform_device_add(pdev);
727
728 if (status < 0) {
729 platform_device_put(pdev);
730 dev_dbg(&twl->client->dev,
731 "can't create gpio dev, %d\n",
732 status);
733 goto err;
734 }
735 }
736
737 if (twl_has_keypad() && pdata->keypad) {
738 pdev = platform_device_alloc("twl4030_keypad", -1);
739 if (pdev) {
740 twl = &twl4030_modules[2];
741 pdev->dev.parent = &twl->client->dev;
742 device_init_wakeup(&pdev->dev, 1);
743 status = platform_device_add_data(pdev, pdata->keypad,
744 sizeof(*pdata->keypad));
745 if (status < 0) {
746 dev_dbg(&twl->client->dev,
747 "can't add keypad data, %d\n",
748 status);
749 platform_device_put(pdev);
750 goto err;
751 }
752 status = platform_device_add(pdev);
753 if (status < 0) {
754 platform_device_put(pdev);
755 dev_dbg(&twl->client->dev,
756 "can't create keypad dev, %d\n",
757 status);
758 goto err;
759 }
760 } else {
761 pr_debug("%s: can't alloc keypad dev\n", DRIVER_NAME);
762 status = -ENOMEM;
763 goto err;
764 }
765 }
766
767 if (twl_has_madc() && pdata->madc) {
768 pdev = platform_device_alloc("twl4030_madc", -1);
769 if (pdev) {
770 twl = &twl4030_modules[2];
771 pdev->dev.parent = &twl->client->dev;
772 device_init_wakeup(&pdev->dev, 1);
773 status = platform_device_add_data(pdev, pdata->madc,
774 sizeof(*pdata->madc));
775 if (status < 0) {
776 platform_device_put(pdev);
777 dev_dbg(&twl->client->dev,
778 "can't add madc data, %d\n",
779 status);
780 goto err;
781 }
782 status = platform_device_add(pdev);
783 if (status < 0) {
784 platform_device_put(pdev);
785 dev_dbg(&twl->client->dev,
786 "can't create madc dev, %d\n",
787 status);
788 goto err;
789 }
790 } else {
791 pr_debug("%s: can't alloc madc dev\n", DRIVER_NAME);
792 status = -ENOMEM;
793 goto err;
794 }
795 }
796
797 if (twl_has_rtc()) {
798 twl = &twl4030_modules[3];
799
800 pdev = platform_device_alloc("twl4030_rtc", -1);
801 if (!pdev) {
802 pr_debug("%s: can't alloc rtc dev\n", DRIVER_NAME);
803 status = -ENOMEM;
804 } else {
805 pdev->dev.parent = &twl->client->dev;
806 device_init_wakeup(&pdev->dev, 1);
807 }
808
809 /*
810 * REVISIT platform_data here currently might use of
811 * "msecure" line ... but for now we just expect board
812 * setup to tell the chip "we are secure" at all times.
813 * Eventually, Linux might become more aware of such
814 * HW security concerns, and "least privilege".
815 */
816
817 /* RTC module IRQ */
818 if (status == 0) {
819 struct resource r = {
820 /* REVISIT don't hard-wire this stuff */
821 .start = TWL4030_PWRIRQ_RTC,
822 .flags = IORESOURCE_IRQ,
823 };
824
825 status = platform_device_add_resources(pdev, &r, 1);
826 }
827
828 if (status == 0)
829 status = platform_device_add(pdev);
830
831 if (status < 0) {
832 platform_device_put(pdev);
833 dev_dbg(&twl->client->dev,
834 "can't create rtc dev, %d\n",
835 status);
836 goto err;
837 }
838 }
839
840 if (twl_has_usb() && pdata->usb) {
841 twl = &twl4030_modules[0];
842
843 pdev = platform_device_alloc("twl4030_usb", -1);
844 if (!pdev) {
845 pr_debug("%s: can't alloc usb dev\n", DRIVER_NAME);
846 status = -ENOMEM;
847 goto err;
848 }
849
850 if (status == 0) {
851 pdev->dev.parent = &twl->client->dev;
852 device_init_wakeup(&pdev->dev, 1);
853 status = platform_device_add_data(pdev, pdata->usb,
854 sizeof(*pdata->usb));
855 if (status < 0) {
856 platform_device_put(pdev);
857 dev_dbg(&twl->client->dev,
858 "can't add usb data, %d\n",
859 status);
860 goto err;
861 }
862 }
863
864 if (status == 0) {
865 struct resource r = {
866 .start = TWL4030_PWRIRQ_USB_PRES,
867 .flags = IORESOURCE_IRQ,
868 };
869
870 status = platform_device_add_resources(pdev, &r, 1);
871 }
872
873 if (status == 0)
874 status = platform_device_add(pdev);
875
876 if (status < 0) {
877 platform_device_put(pdev);
878 dev_dbg(&twl->client->dev,
879 "can't create usb dev, %d\n",
880 status);
881 }
882 }
883
884err:
885 if (status)
886 pr_err("failed to add twl4030's children (status %d)\n", status);
887 return status;
888}
889
890/*----------------------------------------------------------------------*/
891
892/*
893 * These three functions initialize the on-chip clock framework,
894 * letting it generate the right frequencies for USB, MADC, and
895 * other purposes.
896 */
897static inline int __init protect_pm_master(void)
898{
899 int e = 0;
900
901 e = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_LOCK,
902 R_PROTECT_KEY);
903 return e;
904}
905
906static inline int __init unprotect_pm_master(void)
907{
908 int e = 0;
909
910 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK1,
911 R_PROTECT_KEY);
912 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK2,
913 R_PROTECT_KEY);
914 return e;
915}
916
917static void __init clocks_init(void)
918{
919 int e = 0;
920 struct clk *osc;
921 u32 rate;
922 u8 ctrl = HFCLK_FREQ_26_MHZ;
923
924#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
925 if (cpu_is_omap2430())
926 osc = clk_get(NULL, "osc_ck");
927 else
928 osc = clk_get(NULL, "osc_sys_ck");
929#else
930 /* REVISIT for non-OMAP systems, pass the clock rate from
931 * board init code, using platform_data.
932 */
933 osc = ERR_PTR(-EIO);
934#endif
935 if (IS_ERR(osc)) {
936 printk(KERN_WARNING "Skipping twl4030 internal clock init and "
937 "using bootloader value (unknown osc rate)\n");
938 return;
939 }
940
941 rate = clk_get_rate(osc);
942 clk_put(osc);
943
944 switch (rate) {
945 case 19200000:
946 ctrl = HFCLK_FREQ_19p2_MHZ;
947 break;
948 case 26000000:
949 ctrl = HFCLK_FREQ_26_MHZ;
950 break;
951 case 38400000:
952 ctrl = HFCLK_FREQ_38p4_MHZ;
953 break;
954 }
955
956 ctrl |= HIGH_PERF_SQ;
957 e |= unprotect_pm_master();
958 /* effect->MADC+USB ck en */
959 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, ctrl, R_CFG_BOOT);
960 e |= protect_pm_master();
961
962 if (e < 0)
963 pr_err("%s: clock init err [%d]\n", DRIVER_NAME, e);
964}
965
966/*----------------------------------------------------------------------*/
967
968/**
969 * twl4030_i2c_clear_isr - clear TWL4030 SIH ISR regs via read + write
970 * @mod_no: TWL4030 module number
971 * @reg: register index to clear
972 * @cor: value of the <module>_SIH_CTRL.COR bit (1 or 0)
973 *
974 * Either reads (cor == 1) or writes (cor == 0) to a TWL4030 interrupt
975 * status register to ensure that any prior interrupts are cleared.
976 * Returns the status from the I2C read operation.
977 */
978static int __init twl4030_i2c_clear_isr(u8 mod_no, u8 reg, u8 cor)
979{
980 u8 tmp;
981
982 return (cor) ? twl4030_i2c_read_u8(mod_no, &tmp, reg) :
983 twl4030_i2c_write_u8(mod_no, 0xff, reg);
984}
985
986/**
987 * twl4030_read_cor_bit - are TWL module ISRs cleared by reads or writes?
988 * @mod_no: TWL4030 module number
989 * @reg: register index to clear
990 *
991 * Returns 1 if the TWL4030 SIH interrupt status registers (ISRs) for
992 * the specified TWL module are cleared by reads, or 0 if cleared by
993 * writes.
994 */
995static int twl4030_read_cor_bit(u8 mod_no, u8 reg)
996{
997 u8 tmp = 0;
998
999 WARN_ON(twl4030_i2c_read_u8(mod_no, &tmp, reg) < 0);
1000
1001 tmp &= TWL4030_SIH_CTRL_COR_MASK;
1002 tmp >>= __ffs(TWL4030_SIH_CTRL_COR_MASK);
1003
1004 return tmp;
1005}
1006
1007/**
1008 * twl4030_mask_clear_intrs - mask and clear all TWL4030 interrupts
1009 * @t: pointer to twl4030_mod_iregs array
1010 * @t_sz: ARRAY_SIZE(t) (starting at 1)
1011 *
1012 * Mask all TWL4030 interrupt mask registers (IMRs) and clear all
1013 * interrupt status registers (ISRs). No return value, but will WARN if
1014 * any I2C operations fail.
1015 */
1016static void __init twl4030_mask_clear_intrs(const struct twl4030_mod_iregs *t,
1017 const u8 t_sz)
1018{
1019 int i, j;
1020
1021 /*
1022 * N.B. - further efficiency is possible here. Eight I2C
1023 * operations on BCI and GPIO modules are avoidable if I2C
1024 * burst read/write transactions were implemented. Would
1025 * probably save about 1ms of boot time and a small amount of
1026 * power.
1027 */
1028 for (i = 0; i < t_sz; i++) {
1029 const struct twl4030_mod_iregs tmr = t[i];
1030 int cor;
1031
1032 /* Are ISRs cleared by reads or writes? */
1033 cor = twl4030_read_cor_bit(tmr.mod_no, tmr.sih_ctrl);
1034
1035 for (j = 0; j < tmr.reg_cnt; j++) {
1036
1037 /* Mask interrupts at the TWL4030 */
1038 WARN_ON(twl4030_i2c_write_u8(tmr.mod_no, 0xff,
1039 tmr.imrs[j]) < 0);
1040
1041 /* Clear TWL4030 ISRs */
1042 WARN_ON(twl4030_i2c_clear_isr(tmr.mod_no,
1043 tmr.isrs[j], cor) < 0);
1044 }
1045 }
1046}
1047
1048
1049static void twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
1050{
1051 int i;
1052
1053 /*
1054 * Mask and clear all TWL4030 interrupts since initially we do
1055 * not have any TWL4030 module interrupt handlers present
1056 */
1057 twl4030_mask_clear_intrs(twl4030_mod_regs,
1058 ARRAY_SIZE(twl4030_mod_regs));
1059
1060 twl4030_irq_base = irq_base;
1061
1062 /* install an irq handler for each of the PIH modules */
1063 for (i = irq_base; i < irq_end; i++) {
1064 set_irq_chip_and_handler(i, &twl4030_irq_chip,
1065 handle_simple_irq);
1066 activate_irq(i);
1067 }
1068
1069 /* install an irq handler to demultiplex the TWL4030 interrupt */
1070 set_irq_data(irq_num, start_twl4030_irq_thread(irq_num));
1071 set_irq_chained_handler(irq_num, do_twl4030_irq);
1072}
1073
1074/*----------------------------------------------------------------------*/
1075
1076static int twl4030_remove(struct i2c_client *client)
1077{
1078 unsigned i;
1079
1080 /* FIXME undo twl_init_irq() */
1081 if (twl4030_irq_base) {
1082 dev_err(&client->dev, "can't yet clean up IRQs?\n");
1083 return -ENOSYS;
1084 }
1085
1086 for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
1087 struct twl4030_client *twl = &twl4030_modules[i];
1088
1089 if (twl->client && twl->client != client)
1090 i2c_unregister_device(twl->client);
1091 twl4030_modules[i].client = NULL;
1092 }
1093 inuse = false;
1094 return 0;
1095}
1096
1097/* NOTE: this driver only handles a single twl4030/tps659x0 chip */
1098static int
1099twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
1100{
1101 int status;
1102 unsigned i;
1103 struct twl4030_platform_data *pdata = client->dev.platform_data;
1104
1105 if (!pdata) {
1106 dev_dbg(&client->dev, "no platform data?\n");
1107 return -EINVAL;
1108 }
1109
1110 if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) == 0) {
1111 dev_dbg(&client->dev, "can't talk I2C?\n");
1112 return -EIO;
1113 }
1114
1115 if (inuse || twl4030_irq_base) {
1116 dev_dbg(&client->dev, "driver is already in use\n");
1117 return -EBUSY;
1118 }
1119
1120 for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
1121 struct twl4030_client *twl = &twl4030_modules[i];
1122
1123 twl->address = client->addr + i;
1124 if (i == 0)
1125 twl->client = client;
1126 else {
1127 twl->client = i2c_new_dummy(client->adapter,
1128 twl->address);
1129 if (!twl->client) {
1130 dev_err(&twl->client->dev,
1131 "can't attach client %d\n", i);
1132 status = -ENOMEM;
1133 goto fail;
1134 }
1135 strlcpy(twl->client->name, id->name,
1136 sizeof(twl->client->name));
1137 }
1138 mutex_init(&twl->xfer_lock);
1139 }
1140 inuse = true;
1141
1142 /* setup clock framework */
1143 clocks_init();
1144
1145 /* Maybe init the T2 Interrupt subsystem */
1146 if (client->irq
1147 && pdata->irq_base
1148 && pdata->irq_end > pdata->irq_base) {
1149 twl_init_irq(client->irq, pdata->irq_base, pdata->irq_end);
1150 dev_info(&client->dev, "IRQ %d chains IRQs %d..%d\n",
1151 client->irq, pdata->irq_base, pdata->irq_end - 1);
1152 }
1153
1154 status = add_children(pdata);
1155fail:
1156 if (status < 0)
1157 twl4030_remove(client);
1158 return status;
1159}
1160
1161static const struct i2c_device_id twl4030_ids[] = {
1162 { "twl4030", 0 }, /* "Triton 2" */
1163 { "tps65950", 0 }, /* catalog version of twl4030 */
1164 { "tps65930", 0 }, /* fewer LDOs and DACs; no charger */
1165 { "tps65920", 0 }, /* fewer LDOs; no codec or charger */
1166 { "twl5030", 0 }, /* T2 updated */
1167 { /* end of list */ },
1168};
1169MODULE_DEVICE_TABLE(i2c, twl4030_ids);
1170
1171/* One Client Driver , 4 Clients */
1172static struct i2c_driver twl4030_driver = {
1173 .driver.name = DRIVER_NAME,
1174 .id_table = twl4030_ids,
1175 .probe = twl4030_probe,
1176 .remove = twl4030_remove,
1177};
1178
1179static int __init twl4030_init(void)
1180{
1181 return i2c_add_driver(&twl4030_driver);
1182}
1183subsys_initcall(twl4030_init);
1184
1185static void __exit twl4030_exit(void)
1186{
1187 i2c_del_driver(&twl4030_driver);
1188}
1189module_exit(twl4030_exit);
1190
1191MODULE_AUTHOR("Texas Instruments, Inc.");
1192MODULE_DESCRIPTION("I2C Core interface for TWL4030");
1193MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-01 10:07:41 -0500