2 * twl4030_core.c - driver for TWL4030/TPS659x0 PM and audio CODEC devices
4 * Copyright (C) 2005-2006 Texas Instruments, Inc.
6 * Modifications to defer interrupt handling to a kernel thread:
7 * Copyright (C) 2006 MontaVista Software, Inc.
9 * Based on tlv320aic23.c:
10 * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
12 * Code cleanup and modifications to IRQ handler.
13 * by syed khasim <x0khasim@ti.com>
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.
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.
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
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>
40 #include <linux/i2c.h>
41 #include <linux/i2c/twl4030.h>
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.
50 * This driver core provides genirq support for the interrupts emitted,
51 * by the various modules, and exports register access primitives.
53 * FIXME this driver currently requires use of the first interrupt line
54 * (and associated registers).
57 #define DRIVER_NAME "twl4030"
59 #if defined(CONFIG_TWL4030_BCI_BATTERY) || \
60 defined(CONFIG_TWL4030_BCI_BATTERY_MODULE)
61 #define twl_has_bci() true
63 #define twl_has_bci() false
66 #if defined(CONFIG_KEYBOARD_TWL4030) || defined(CONFIG_KEYBOARD_TWL4030_MODULE)
67 #define twl_has_keypad() true
69 #define twl_has_keypad() false
72 #if defined(CONFIG_GPIO_TWL4030) || defined(CONFIG_GPIO_TWL4030_MODULE)
73 #define twl_has_gpio() true
75 #define twl_has_gpio() false
78 #if defined(CONFIG_TWL4030_MADC) || defined(CONFIG_TWL4030_MADC_MODULE)
79 #define twl_has_madc() true
81 #define twl_has_madc() false
84 #if defined(CONFIG_RTC_DRV_TWL4030) || defined(CONFIG_RTC_DRV_TWL4030_MODULE)
85 #define twl_has_rtc() true
87 #define twl_has_rtc() false
90 #if defined(CONFIG_TWL4030_USB) || defined(CONFIG_TWL4030_USB_MODULE)
91 #define twl_has_usb() true
93 #define twl_has_usb() false
96 static inline void activate_irq(int irq)
99 /* ARM requires an extra step to clear IRQ_NOREQUEST, which it
100 * sets on behalf of every irq_chip. Also sets IRQ_NOPROBE.
102 set_irq_flags(irq, IRQF_VALID);
104 /* same effect on other architectures */
105 set_irq_noprobe(irq);
109 /* Primary Interrupt Handler on TWL4030 Registers */
111 /* Register Definitions */
113 #define REG_PIH_ISR_P1 (0x1)
114 #define REG_PIH_ISR_P2 (0x2)
115 #define REG_PIH_SIR (0x3)
117 /* Triton Core internal information (BEGIN) */
119 /* Last - for index max*/
120 #define TWL4030_MODULE_LAST TWL4030_MODULE_SECURED_REG
122 #define TWL4030_NUM_SLAVES 4
125 /* Base Address defns for twl4030_map[] */
127 /* subchip/slave 0 - USB ID */
128 #define TWL4030_BASEADD_USB 0x0000
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
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
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
157 /* Triton Core internal information (END) */
160 /* Few power values */
161 #define R_CFG_BOOT 0x05
162 #define R_PROTECT_KEY 0x0E
164 /* access control values for R_PROTECT_KEY */
165 #define KEY_UNLOCK1 0xce
166 #define KEY_UNLOCK2 0xec
167 #define KEY_LOCK 0x00
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)
176 /*----------------------------------------------------------------------*/
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
186 * Ties together TWL4030 modules and lists of IMR/ISR registers to mask/clear
187 * during twl_init_irq().
189 struct twl4030_mod_iregs {
197 /* TWL4030 INT module interrupt mask registers */
198 static const u8 __initconst twl4030_int_imr_regs[] = {
199 TWL4030_INT_PWR_IMR1,
200 TWL4030_INT_PWR_IMR2,
203 /* TWL4030 INT module interrupt status registers */
204 static const u8 __initconst twl4030_int_isr_regs[] = {
205 TWL4030_INT_PWR_ISR1,
206 TWL4030_INT_PWR_ISR2,
209 /* TWL4030 INTERRUPTS module interrupt mask registers */
210 static const u8 __initconst twl4030_interrupts_imr_regs[] = {
211 TWL4030_INTERRUPTS_BCIIMR1A,
212 TWL4030_INTERRUPTS_BCIIMR1B,
213 TWL4030_INTERRUPTS_BCIIMR2A,
214 TWL4030_INTERRUPTS_BCIIMR2B,
217 /* TWL4030 INTERRUPTS module interrupt status registers */
218 static const u8 __initconst twl4030_interrupts_isr_regs[] = {
219 TWL4030_INTERRUPTS_BCIISR1A,
220 TWL4030_INTERRUPTS_BCIISR1B,
221 TWL4030_INTERRUPTS_BCIISR2A,
222 TWL4030_INTERRUPTS_BCIISR2B,
225 /* TWL4030 MADC module interrupt mask registers */
226 static const u8 __initconst twl4030_madc_imr_regs[] = {
231 /* TWL4030 MADC module interrupt status registers */
232 static const u8 __initconst twl4030_madc_isr_regs[] = {
237 /* TWL4030 keypad module interrupt mask registers */
238 static const u8 __initconst twl4030_keypad_imr_regs[] = {
239 TWL4030_KEYPAD_KEYP_IMR1,
240 TWL4030_KEYPAD_KEYP_IMR2,
243 /* TWL4030 keypad module interrupt status registers */
244 static const u8 __initconst twl4030_keypad_isr_regs[] = {
245 TWL4030_KEYPAD_KEYP_ISR1,
246 TWL4030_KEYPAD_KEYP_ISR2,
249 /* TWL4030 GPIO module interrupt mask registers */
250 static const u8 __initconst twl4030_gpio_imr_regs[] = {
259 /* TWL4030 GPIO module interrupt status registers */
260 static const u8 __initconst twl4030_gpio_isr_regs[] = {
269 /* TWL4030 modules that have IMR/ISR registers that must be masked/cleared */
270 static const struct twl4030_mod_iregs __initconst twl4030_mod_regs[] = {
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,
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,
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,
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,
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,
308 /*----------------------------------------------------------------*/
310 /* is driver active, bound to a chip? */
313 /* Structure for each TWL4030 Slave */
314 struct twl4030_client {
315 struct i2c_client *client;
318 /* max numb of i2c_msg required is for read =2 */
319 struct i2c_msg xfer_msg[2];
321 /* To lock access to xfer_msg */
322 struct mutex xfer_lock;
325 static struct twl4030_client twl4030_modules[TWL4030_NUM_SLAVES];
328 /* mapping the module id to slave id and base address */
329 struct twl4030mapping {
330 unsigned char sid; /* Slave ID */
331 unsigned char base; /* base address */
334 static struct twl4030mapping twl4030_map[TWL4030_MODULE_LAST + 1] = {
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.
341 { 0, TWL4030_BASEADD_USB },
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 },
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 },
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 },
368 /*----------------------------------------------------------------------*/
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.
376 static void twl4030_i2c_ackirq(unsigned int irq)
380 static void twl4030_i2c_disableint(unsigned int irq)
384 static void twl4030_i2c_enableint(unsigned int irq)
388 static struct irq_chip twl4030_irq_chip = {
390 .ack = twl4030_i2c_ackirq,
391 .mask = twl4030_i2c_disableint,
392 .unmask = twl4030_i2c_enableint,
395 /*----------------------------------------------------------------------*/
397 /* Exported Functions */
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
406 * IMPORTANT: for 'value' parameter: Allocate value num_bytes+1 and
407 * valid data starts at Offset 1.
409 * Returns the result of operation - 0 is success
411 int twl4030_i2c_write(u8 mod_no, u8 *value, u8 reg, u8 num_bytes)
415 struct twl4030_client *twl;
418 if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
419 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
422 sid = twl4030_map[mod_no].sid;
423 twl = &twl4030_modules[sid];
425 if (unlikely(!inuse)) {
426 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
429 mutex_lock(&twl->xfer_lock);
431 * [MSG1]: fill the register address data
432 * fill the data Tx buffer
434 msg = &twl->xfer_msg[0];
435 msg->addr = twl->address;
436 msg->len = num_bytes + 1;
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);
444 /* i2cTransfer returns num messages.translate it pls.. */
449 EXPORT_SYMBOL(twl4030_i2c_write);
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
458 * Returns result of operation - num_bytes is success else failure.
460 int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, u8 num_bytes)
465 struct twl4030_client *twl;
468 if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
469 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
472 sid = twl4030_map[mod_no].sid;
473 twl = &twl4030_modules[sid];
475 if (unlikely(!inuse)) {
476 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
479 mutex_lock(&twl->xfer_lock);
480 /* [MSG1] fill the register address data */
481 msg = &twl->xfer_msg[0];
482 msg->addr = twl->address;
484 msg->flags = 0; /* Read the register value */
485 val = twl4030_map[mod_no].base + reg;
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 */
493 ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2);
494 mutex_unlock(&twl->xfer_lock);
496 /* i2cTransfer returns num messages.translate it pls.. */
501 EXPORT_SYMBOL(twl4030_i2c_read);
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)
509 * Returns result of operation - 0 is success
511 int twl4030_i2c_write_u8(u8 mod_no, u8 value, u8 reg)
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);
520 EXPORT_SYMBOL(twl4030_i2c_write_u8);
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)
528 * Returns result of operation - 0 is success
530 int twl4030_i2c_read_u8(u8 mod_no, u8 *value, u8 reg)
532 return twl4030_i2c_read(mod_no, value, reg, 1);
534 EXPORT_SYMBOL(twl4030_i2c_read_u8);
536 /*----------------------------------------------------------------------*/
538 static unsigned twl4030_irq_base;
540 static struct completion irq_event;
543 * This thread processes interrupts reported by the Primary Interrupt Handler.
545 static int twl4030_irq_thread(void *data)
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;
552 current->flags |= PF_NOFREEZE;
554 while (!kthread_should_stop()) {
559 /* Wait for IRQ, then read PIH irq status (also blocking) */
560 wait_for_completion_interruptible(&irq_event);
562 ret = twl4030_i2c_read_u8(TWL4030_MODULE_PIH, &pih_isr,
565 pr_warning("%s: I2C error %d reading PIH ISR\n",
567 if (++i2c_errors >= max_i2c_errors) {
568 printk(KERN_ERR "Maximum I2C error count"
569 " exceeded. Terminating %s.\n",
573 complete(&irq_event);
577 /* these handlers deal with the relevant SIH irq status */
579 for (module_irq = twl4030_irq_base;
581 pih_isr >>= 1, module_irq++) {
583 irq_desc_t *d = irq_desc + module_irq;
585 d->handle_irq(module_irq, d);
590 desc->chip->unmask(irq);
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
605 static void do_twl4030_irq(unsigned int irq, irq_desc_t *desc)
607 const unsigned int cpu = smp_processor_id();
610 * Earlier this was desc->triggered = 1;
612 desc->status |= IRQ_LEVEL;
615 * Acknowledge, clear _AND_ disable the interrupt.
617 desc->chip->ack(irq);
620 kstat_cpu(cpu).irqs[irq]++;
622 complete(&irq_event);
626 static struct task_struct * __init start_twl4030_irq_thread(long irq)
628 struct task_struct *thread;
630 init_completion(&irq_event);
631 thread = kthread_run(twl4030_irq_thread, (void *)irq, "twl4030-irq");
633 pr_err("%s: could not create twl4030 irq %ld thread!\n",
639 /*----------------------------------------------------------------------*/
641 static int add_children(struct twl4030_platform_data *pdata)
643 struct platform_device *pdev = NULL;
644 struct twl4030_client *twl = NULL;
647 if (twl_has_bci() && pdata->bci) {
648 twl = &twl4030_modules[3];
650 pdev = platform_device_alloc("twl4030_bci", -1);
652 pr_debug("%s: can't alloc bci dev\n", DRIVER_NAME);
658 pdev->dev.parent = &twl->client->dev;
659 status = platform_device_add_data(pdev, pdata->bci,
660 sizeof(*pdata->bci));
662 dev_dbg(&twl->client->dev,
663 "can't add bci data, %d\n",
670 struct resource r = {
671 .start = TWL4030_PWRIRQ_CHG_PRES,
672 .flags = IORESOURCE_IRQ,
675 status = platform_device_add_resources(pdev, &r, 1);
679 status = platform_device_add(pdev);
682 platform_device_put(pdev);
683 dev_dbg(&twl->client->dev,
684 "can't create bci dev, %d\n",
690 if (twl_has_gpio() && pdata->gpio) {
691 twl = &twl4030_modules[1];
693 pdev = platform_device_alloc("twl4030_gpio", -1);
695 pr_debug("%s: can't alloc gpio dev\n", DRIVER_NAME);
700 /* more driver model init */
702 pdev->dev.parent = &twl->client->dev;
703 /* device_init_wakeup(&pdev->dev, 1); */
705 status = platform_device_add_data(pdev, pdata->gpio,
706 sizeof(*pdata->gpio));
708 dev_dbg(&twl->client->dev,
709 "can't add gpio data, %d\n",
715 /* GPIO module IRQ */
717 struct resource r = {
718 .start = pdata->irq_base + 0,
719 .flags = IORESOURCE_IRQ,
722 status = platform_device_add_resources(pdev, &r, 1);
726 status = platform_device_add(pdev);
729 platform_device_put(pdev);
730 dev_dbg(&twl->client->dev,
731 "can't create gpio dev, %d\n",
737 if (twl_has_keypad() && pdata->keypad) {
738 pdev = platform_device_alloc("twl4030_keypad", -1);
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));
746 dev_dbg(&twl->client->dev,
747 "can't add keypad data, %d\n",
749 platform_device_put(pdev);
752 status = platform_device_add(pdev);
754 platform_device_put(pdev);
755 dev_dbg(&twl->client->dev,
756 "can't create keypad dev, %d\n",
761 pr_debug("%s: can't alloc keypad dev\n", DRIVER_NAME);
767 if (twl_has_madc() && pdata->madc) {
768 pdev = platform_device_alloc("twl4030_madc", -1);
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));
776 platform_device_put(pdev);
777 dev_dbg(&twl->client->dev,
778 "can't add madc data, %d\n",
782 status = platform_device_add(pdev);
784 platform_device_put(pdev);
785 dev_dbg(&twl->client->dev,
786 "can't create madc dev, %d\n",
791 pr_debug("%s: can't alloc madc dev\n", DRIVER_NAME);
798 twl = &twl4030_modules[3];
800 pdev = platform_device_alloc("twl4030_rtc", -1);
802 pr_debug("%s: can't alloc rtc dev\n", DRIVER_NAME);
805 pdev->dev.parent = &twl->client->dev;
806 device_init_wakeup(&pdev->dev, 1);
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".
819 struct resource r = {
820 /* REVISIT don't hard-wire this stuff */
821 .start = TWL4030_PWRIRQ_RTC,
822 .flags = IORESOURCE_IRQ,
825 status = platform_device_add_resources(pdev, &r, 1);
829 status = platform_device_add(pdev);
832 platform_device_put(pdev);
833 dev_dbg(&twl->client->dev,
834 "can't create rtc dev, %d\n",
840 if (twl_has_usb() && pdata->usb) {
841 twl = &twl4030_modules[0];
843 pdev = platform_device_alloc("twl4030_usb", -1);
845 pr_debug("%s: can't alloc usb dev\n", DRIVER_NAME);
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));
856 platform_device_put(pdev);
857 dev_dbg(&twl->client->dev,
858 "can't add usb data, %d\n",
865 struct resource r = {
866 .start = TWL4030_PWRIRQ_USB_PRES,
867 .flags = IORESOURCE_IRQ,
870 status = platform_device_add_resources(pdev, &r, 1);
874 status = platform_device_add(pdev);
877 platform_device_put(pdev);
878 dev_dbg(&twl->client->dev,
879 "can't create usb dev, %d\n",
886 pr_err("failed to add twl4030's children (status %d)\n", status);
890 /*----------------------------------------------------------------------*/
893 * These three functions initialize the on-chip clock framework,
894 * letting it generate the right frequencies for USB, MADC, and
897 static inline int __init protect_pm_master(void)
901 e = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_LOCK,
906 static inline int __init unprotect_pm_master(void)
910 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK1,
912 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK2,
917 static void __init clocks_init(void)
922 u8 ctrl = HFCLK_FREQ_26_MHZ;
924 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
925 if (cpu_is_omap2430())
926 osc = clk_get(NULL, "osc_ck");
928 osc = clk_get(NULL, "osc_sys_ck");
930 /* REVISIT for non-OMAP systems, pass the clock rate from
931 * board init code, using platform_data.
936 printk(KERN_WARNING "Skipping twl4030 internal clock init and "
937 "using bootloader value (unknown osc rate)\n");
941 rate = clk_get_rate(osc);
946 ctrl = HFCLK_FREQ_19p2_MHZ;
949 ctrl = HFCLK_FREQ_26_MHZ;
952 ctrl = HFCLK_FREQ_38p4_MHZ;
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();
963 pr_err("%s: clock init err [%d]\n", DRIVER_NAME, e);
966 /*----------------------------------------------------------------------*/
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)
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.
978 static int __init twl4030_i2c_clear_isr(u8 mod_no, u8 reg, u8 cor)
982 return (cor) ? twl4030_i2c_read_u8(mod_no, &tmp, reg) :
983 twl4030_i2c_write_u8(mod_no, 0xff, reg);
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
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
995 static int twl4030_read_cor_bit(u8 mod_no, u8 reg)
999 WARN_ON(twl4030_i2c_read_u8(mod_no, &tmp, reg) < 0);
1001 tmp &= TWL4030_SIH_CTRL_COR_MASK;
1002 tmp >>= __ffs(TWL4030_SIH_CTRL_COR_MASK);
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)
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.
1016 static void __init twl4030_mask_clear_intrs(const struct twl4030_mod_iregs *t,
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
1028 for (i = 0; i < t_sz; i++) {
1029 const struct twl4030_mod_iregs tmr = t[i];
1032 /* Are ISRs cleared by reads or writes? */
1033 cor = twl4030_read_cor_bit(tmr.mod_no, tmr.sih_ctrl);
1035 for (j = 0; j < tmr.reg_cnt; j++) {
1037 /* Mask interrupts at the TWL4030 */
1038 WARN_ON(twl4030_i2c_write_u8(tmr.mod_no, 0xff,
1041 /* Clear TWL4030 ISRs */
1042 WARN_ON(twl4030_i2c_clear_isr(tmr.mod_no,
1043 tmr.isrs[j], cor) < 0);
1049 static void twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
1054 * Mask and clear all TWL4030 interrupts since initially we do
1055 * not have any TWL4030 module interrupt handlers present
1057 twl4030_mask_clear_intrs(twl4030_mod_regs,
1058 ARRAY_SIZE(twl4030_mod_regs));
1060 twl4030_irq_base = irq_base;
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,
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);
1074 /*----------------------------------------------------------------------*/
1076 static int twl4030_remove(struct i2c_client *client)
1080 /* FIXME undo twl_init_irq() */
1081 if (twl4030_irq_base) {
1082 dev_err(&client->dev, "can't yet clean up IRQs?\n");
1086 for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
1087 struct twl4030_client *twl = &twl4030_modules[i];
1089 if (twl->client && twl->client != client)
1090 i2c_unregister_device(twl->client);
1091 twl4030_modules[i].client = NULL;
1097 /* NOTE: this driver only handles a single twl4030/tps659x0 chip */
1099 twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
1103 struct twl4030_platform_data *pdata = client->dev.platform_data;
1106 dev_dbg(&client->dev, "no platform data?\n");
1110 if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) == 0) {
1111 dev_dbg(&client->dev, "can't talk I2C?\n");
1115 if (inuse || twl4030_irq_base) {
1116 dev_dbg(&client->dev, "driver is already in use\n");
1120 for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
1121 struct twl4030_client *twl = &twl4030_modules[i];
1123 twl->address = client->addr + i;
1125 twl->client = client;
1127 twl->client = i2c_new_dummy(client->adapter,
1130 dev_err(&twl->client->dev,
1131 "can't attach client %d\n", i);
1135 strlcpy(twl->client->name, id->name,
1136 sizeof(twl->client->name));
1138 mutex_init(&twl->xfer_lock);
1142 /* setup clock framework */
1145 /* Maybe init the T2 Interrupt subsystem */
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);
1154 status = add_children(pdata);
1157 twl4030_remove(client);
1161 static 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 */ },
1169 MODULE_DEVICE_TABLE(i2c, twl4030_ids);
1171 /* One Client Driver , 4 Clients */
1172 static struct i2c_driver twl4030_driver = {
1173 .driver.name = DRIVER_NAME,
1174 .id_table = twl4030_ids,
1175 .probe = twl4030_probe,
1176 .remove = twl4030_remove,
1179 static int __init twl4030_init(void)
1181 return i2c_add_driver(&twl4030_driver);
1183 subsys_initcall(twl4030_init);
1185 static void __exit twl4030_exit(void)
1187 i2c_del_driver(&twl4030_driver);
1189 module_exit(twl4030_exit);
1191 MODULE_AUTHOR("Texas Instruments, Inc.");
1192 MODULE_DESCRIPTION("I2C Core interface for TWL4030");
1193 MODULE_LICENSE("GPL");