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>
42 #include <linux/i2c/twl4030-gpio.h>
43 #include <linux/i2c/twl4030-madc.h>
44 #include <linux/i2c/twl4030-pwrirq.h>
46 #define DRIVER_NAME "twl4030"
48 #if defined(CONFIG_RTC_DRV_TWL4030) || defined(CONFIG_RTC_DRV_TWL4030_MODULE)
49 #define twl_has_rtc() true
51 #define twl_has_rtc() false
54 /* Primary Interrupt Handler on TWL4030 Registers */
56 /* Register Definitions */
58 #define REG_PIH_ISR_P1 (0x1)
59 #define REG_PIH_ISR_P2 (0x2)
60 #define REG_PIH_SIR (0x3)
62 /* Triton Core internal information (BEGIN) */
64 /* Last - for index max*/
65 #define TWL4030_MODULE_LAST TWL4030_MODULE_SECURED_REG
67 #define TWL4030_NUM_SLAVES 4
70 #define TWL4030_SLAVENUM_NUM0 0x00
71 #define TWL4030_SLAVENUM_NUM1 0x01
72 #define TWL4030_SLAVENUM_NUM2 0x02
73 #define TWL4030_SLAVENUM_NUM3 0x03
75 /* Base Address defns */
77 #define TWL4030_BASEADD_USB 0x0000
79 #define TWL4030_BASEADD_AUDIO_VOICE 0x0000
80 #define TWL4030_BASEADD_GPIO 0x0098
82 #define TWL4030_BASEADD_INTBR 0x0085
83 #define TWL4030_BASEADD_PIH 0x0080
84 #define TWL4030_BASEADD_TEST 0x004C
86 #define TWL4030_BASEADD_INTERRUPTS 0x00B9
87 #define TWL4030_BASEADD_LED 0x00EE
88 #define TWL4030_BASEADD_MADC 0x0000
89 #define TWL4030_BASEADD_MAIN_CHARGE 0x0074
90 #define TWL4030_BASEADD_PRECHARGE 0x00AA
91 #define TWL4030_BASEADD_PWM0 0x00F8
92 #define TWL4030_BASEADD_PWM1 0x00FB
93 #define TWL4030_BASEADD_PWMA 0x00EF
94 #define TWL4030_BASEADD_PWMB 0x00F1
95 #define TWL4030_BASEADD_KEYPAD 0x00D2
97 #define TWL4030_BASEADD_BACKUP 0x0014
98 #define TWL4030_BASEADD_INT 0x002E
99 #define TWL4030_BASEADD_PM_MASTER 0x0036
100 #define TWL4030_BASEADD_PM_RECEIVER 0x005B
101 #define TWL4030_BASEADD_RTC 0x001C
102 #define TWL4030_BASEADD_SECURED_REG 0x0000
104 /* TWL4030 BCI registers */
105 #define TWL4030_INTERRUPTS_BCIIMR1A 0x2
106 #define TWL4030_INTERRUPTS_BCIIMR2A 0x3
107 #define TWL4030_INTERRUPTS_BCIIMR1B 0x6
108 #define TWL4030_INTERRUPTS_BCIIMR2B 0x7
109 #define TWL4030_INTERRUPTS_BCIISR1A 0x0
110 #define TWL4030_INTERRUPTS_BCIISR2A 0x1
111 #define TWL4030_INTERRUPTS_BCIISR1B 0x4
112 #define TWL4030_INTERRUPTS_BCIISR2B 0x5
114 /* TWL4030 keypad registers */
115 #define TWL4030_KEYPAD_KEYP_IMR1 0x12
116 #define TWL4030_KEYPAD_KEYP_IMR2 0x14
117 #define TWL4030_KEYPAD_KEYP_ISR1 0x11
118 #define TWL4030_KEYPAD_KEYP_ISR2 0x13
121 /* Triton Core internal information (END) */
123 /* Few power values */
124 #define R_CFG_BOOT 0x05
125 #define R_PROTECT_KEY 0x0E
128 #define KEY_UNLOCK1 0xce
129 #define KEY_UNLOCK2 0xec
130 #define KEY_LOCK 0x00
132 #define HFCLK_FREQ_19p2_MHZ (1 << 0)
133 #define HFCLK_FREQ_26_MHZ (2 << 0)
134 #define HFCLK_FREQ_38p4_MHZ (3 << 0)
135 #define HIGH_PERF_SQ (1 << 3)
137 /* SIH_CTRL registers that aren't defined elsewhere */
138 #define TWL4030_INTERRUPTS_BCISIHCTRL 0x0d
139 #define TWL4030_MADC_MADC_SIH_CTRL 0x67
140 #define TWL4030_KEYPAD_KEYP_SIH_CTRL 0x17
142 #define TWL4030_SIH_CTRL_COR_MASK (1 << 2)
145 * struct twl4030_mod_iregs - TWL module IMR/ISR regs to mask/clear at init
146 * @mod_no: TWL4030 module number (e.g., TWL4030_MODULE_GPIO)
147 * @sih_ctrl: address of module SIH_CTRL register
148 * @reg_cnt: number of IMR/ISR regs
149 * @imrs: pointer to array of TWL module interrupt mask register indices
150 * @isrs: pointer to array of TWL module interrupt status register indices
152 * Ties together TWL4030 modules and lists of IMR/ISR registers to mask/clear
153 * during twl_init_irq().
155 struct twl4030_mod_iregs {
163 /* TWL4030 INT module interrupt mask registers */
164 static const u8 __initconst twl4030_int_imr_regs[] = {
165 TWL4030_INT_PWR_IMR1,
166 TWL4030_INT_PWR_IMR2,
169 /* TWL4030 INT module interrupt status registers */
170 static const u8 __initconst twl4030_int_isr_regs[] = {
171 TWL4030_INT_PWR_ISR1,
172 TWL4030_INT_PWR_ISR2,
175 /* TWL4030 INTERRUPTS module interrupt mask registers */
176 static const u8 __initconst twl4030_interrupts_imr_regs[] = {
177 TWL4030_INTERRUPTS_BCIIMR1A,
178 TWL4030_INTERRUPTS_BCIIMR1B,
179 TWL4030_INTERRUPTS_BCIIMR2A,
180 TWL4030_INTERRUPTS_BCIIMR2B,
183 /* TWL4030 INTERRUPTS module interrupt status registers */
184 static const u8 __initconst twl4030_interrupts_isr_regs[] = {
185 TWL4030_INTERRUPTS_BCIISR1A,
186 TWL4030_INTERRUPTS_BCIISR1B,
187 TWL4030_INTERRUPTS_BCIISR2A,
188 TWL4030_INTERRUPTS_BCIISR2B,
191 /* TWL4030 MADC module interrupt mask registers */
192 static const u8 __initconst twl4030_madc_imr_regs[] = {
197 /* TWL4030 MADC module interrupt status registers */
198 static const u8 __initconst twl4030_madc_isr_regs[] = {
203 /* TWL4030 keypad module interrupt mask registers */
204 static const u8 __initconst twl4030_keypad_imr_regs[] = {
205 TWL4030_KEYPAD_KEYP_IMR1,
206 TWL4030_KEYPAD_KEYP_IMR2,
209 /* TWL4030 keypad module interrupt status registers */
210 static const u8 __initconst twl4030_keypad_isr_regs[] = {
211 TWL4030_KEYPAD_KEYP_ISR1,
212 TWL4030_KEYPAD_KEYP_ISR2,
215 /* TWL4030 GPIO module interrupt mask registers */
216 static const u8 __initconst twl4030_gpio_imr_regs[] = {
225 /* TWL4030 GPIO module interrupt status registers */
226 static const u8 __initconst twl4030_gpio_isr_regs[] = {
235 /* TWL4030 modules that have IMR/ISR registers that must be masked/cleared */
236 static const struct twl4030_mod_iregs __initconst twl4030_mod_regs[] = {
238 .mod_no = TWL4030_MODULE_INT,
239 .sih_ctrl = TWL4030_INT_PWR_SIH_CTRL,
240 .reg_cnt = ARRAY_SIZE(twl4030_int_imr_regs),
241 .imrs = twl4030_int_imr_regs,
242 .isrs = twl4030_int_isr_regs,
245 .mod_no = TWL4030_MODULE_INTERRUPTS,
246 .sih_ctrl = TWL4030_INTERRUPTS_BCISIHCTRL,
247 .reg_cnt = ARRAY_SIZE(twl4030_interrupts_imr_regs),
248 .imrs = twl4030_interrupts_imr_regs,
249 .isrs = twl4030_interrupts_isr_regs,
252 .mod_no = TWL4030_MODULE_MADC,
253 .sih_ctrl = TWL4030_MADC_MADC_SIH_CTRL,
254 .reg_cnt = ARRAY_SIZE(twl4030_madc_imr_regs),
255 .imrs = twl4030_madc_imr_regs,
256 .isrs = twl4030_madc_isr_regs,
259 .mod_no = TWL4030_MODULE_KEYPAD,
260 .sih_ctrl = TWL4030_KEYPAD_KEYP_SIH_CTRL,
261 .reg_cnt = ARRAY_SIZE(twl4030_keypad_imr_regs),
262 .imrs = twl4030_keypad_imr_regs,
263 .isrs = twl4030_keypad_isr_regs,
266 .mod_no = TWL4030_MODULE_GPIO,
267 .sih_ctrl = REG_GPIO_SIH_CTRL,
268 .reg_cnt = ARRAY_SIZE(twl4030_gpio_imr_regs),
269 .imrs = twl4030_gpio_imr_regs,
270 .isrs = twl4030_gpio_isr_regs,
275 /* Data Structures */
276 /* To have info on T2 IRQ substem activated or not */
277 static struct completion irq_event;
279 /* Structure to define on TWL4030 Slave ID */
280 struct twl4030_client {
281 struct i2c_client *client;
285 /* max numb of i2c_msg required is for read =2 */
286 struct i2c_msg xfer_msg[2];
288 /* To lock access to xfer_msg */
289 struct mutex xfer_lock;
293 struct twl4030mapping {
294 unsigned char sid; /* Slave ID */
295 unsigned char base; /* base address */
298 /* mapping the module id to slave id and base address */
299 static struct twl4030mapping twl4030_map[TWL4030_MODULE_LAST + 1] = {
300 { TWL4030_SLAVENUM_NUM0, TWL4030_BASEADD_USB },
301 { TWL4030_SLAVENUM_NUM1, TWL4030_BASEADD_AUDIO_VOICE },
302 { TWL4030_SLAVENUM_NUM1, TWL4030_BASEADD_GPIO },
303 { TWL4030_SLAVENUM_NUM1, TWL4030_BASEADD_INTBR },
304 { TWL4030_SLAVENUM_NUM1, TWL4030_BASEADD_PIH },
305 { TWL4030_SLAVENUM_NUM1, TWL4030_BASEADD_TEST },
306 { TWL4030_SLAVENUM_NUM2, TWL4030_BASEADD_KEYPAD },
307 { TWL4030_SLAVENUM_NUM2, TWL4030_BASEADD_MADC },
308 { TWL4030_SLAVENUM_NUM2, TWL4030_BASEADD_INTERRUPTS },
309 { TWL4030_SLAVENUM_NUM2, TWL4030_BASEADD_LED },
310 { TWL4030_SLAVENUM_NUM2, TWL4030_BASEADD_MAIN_CHARGE },
311 { TWL4030_SLAVENUM_NUM2, TWL4030_BASEADD_PRECHARGE },
312 { TWL4030_SLAVENUM_NUM2, TWL4030_BASEADD_PWM0 },
313 { TWL4030_SLAVENUM_NUM2, TWL4030_BASEADD_PWM1 },
314 { TWL4030_SLAVENUM_NUM2, TWL4030_BASEADD_PWMA },
315 { TWL4030_SLAVENUM_NUM2, TWL4030_BASEADD_PWMB },
316 { TWL4030_SLAVENUM_NUM3, TWL4030_BASEADD_BACKUP },
317 { TWL4030_SLAVENUM_NUM3, TWL4030_BASEADD_INT },
318 { TWL4030_SLAVENUM_NUM3, TWL4030_BASEADD_PM_MASTER },
319 { TWL4030_SLAVENUM_NUM3, TWL4030_BASEADD_PM_RECEIVER },
320 { TWL4030_SLAVENUM_NUM3, TWL4030_BASEADD_RTC },
321 { TWL4030_SLAVENUM_NUM3, TWL4030_BASEADD_SECURED_REG },
324 static struct twl4030_client twl4030_modules[TWL4030_NUM_SLAVES];
327 * TWL4030 doesn't have PIH mask, hence dummy function for mask
331 static void twl4030_i2c_ackirq(unsigned int irq)
335 static void twl4030_i2c_disableint(unsigned int irq)
339 static void twl4030_i2c_enableint(unsigned int irq)
343 /* information for processing in the Work Item */
344 static struct irq_chip twl4030_irq_chip = {
346 .ack = twl4030_i2c_ackirq,
347 .mask = twl4030_i2c_disableint,
348 .unmask = twl4030_i2c_enableint,
351 /* Global Functions */
354 * twl4030_i2c_write - Writes a n bit register in TWL4030
355 * @mod_no: module number
356 * @value: an array of num_bytes+1 containing data to write
357 * @reg: register address (just offset will do)
358 * @num_bytes: number of bytes to transfer
360 * IMPORTANT: for 'value' parameter: Allocate value num_bytes+1 and
361 * valid data starts at Offset 1.
363 * Returns the result of operation - 0 is success
365 int twl4030_i2c_write(u8 mod_no, u8 *value, u8 reg, u8 num_bytes)
369 struct twl4030_client *twl;
372 if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
373 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
376 sid = twl4030_map[mod_no].sid;
377 twl = &twl4030_modules[sid];
379 if (unlikely(!twl->inuse)) {
380 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
383 mutex_lock(&twl->xfer_lock);
385 * [MSG1]: fill the register address data
386 * fill the data Tx buffer
388 msg = &twl->xfer_msg[0];
389 msg->addr = twl->address;
390 msg->len = num_bytes + 1;
393 /* over write the first byte of buffer with the register address */
394 *value = twl4030_map[mod_no].base + reg;
395 ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 1);
396 mutex_unlock(&twl->xfer_lock);
398 /* i2cTransfer returns num messages.translate it pls.. */
403 EXPORT_SYMBOL(twl4030_i2c_write);
406 * twl4030_i2c_read - Reads a n bit register in TWL4030
407 * @mod_no: module number
408 * @value: an array of num_bytes containing data to be read
409 * @reg: register address (just offset will do)
410 * @num_bytes: number of bytes to transfer
412 * Returns result of operation - num_bytes is success else failure.
414 int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, u8 num_bytes)
419 struct twl4030_client *twl;
422 if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
423 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
426 sid = twl4030_map[mod_no].sid;
427 twl = &twl4030_modules[sid];
429 if (unlikely(!twl->inuse)) {
430 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
433 mutex_lock(&twl->xfer_lock);
434 /* [MSG1] fill the register address data */
435 msg = &twl->xfer_msg[0];
436 msg->addr = twl->address;
438 msg->flags = 0; /* Read the register value */
439 val = twl4030_map[mod_no].base + reg;
441 /* [MSG2] fill the data rx buffer */
442 msg = &twl->xfer_msg[1];
443 msg->addr = twl->address;
444 msg->flags = I2C_M_RD; /* Read the register value */
445 msg->len = num_bytes; /* only n bytes */
447 ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2);
448 mutex_unlock(&twl->xfer_lock);
450 /* i2cTransfer returns num messages.translate it pls.. */
455 EXPORT_SYMBOL(twl4030_i2c_read);
458 * twl4030_i2c_write_u8 - Writes a 8 bit register in TWL4030
459 * @mod_no: module number
460 * @value: the value to be written 8 bit
461 * @reg: register address (just offset will do)
463 * Returns result of operation - 0 is success
465 int twl4030_i2c_write_u8(u8 mod_no, u8 value, u8 reg)
468 /* 2 bytes offset 1 contains the data offset 0 is used by i2c_write */
469 u8 temp_buffer[2] = { 0 };
470 /* offset 1 contains the data */
471 temp_buffer[1] = value;
472 return twl4030_i2c_write(mod_no, temp_buffer, reg, 1);
474 EXPORT_SYMBOL(twl4030_i2c_write_u8);
477 * twl4030_i2c_read_u8 - Reads a 8 bit register from TWL4030
478 * @mod_no: module number
479 * @value: the value read 8 bit
480 * @reg: register address (just offset will do)
482 * Returns result of operation - 0 is success
484 int twl4030_i2c_read_u8(u8 mod_no, u8 *value, u8 reg)
486 return twl4030_i2c_read(mod_no, value, reg, 1);
488 EXPORT_SYMBOL(twl4030_i2c_read_u8);
490 /* Helper Functions */
493 * do_twl4030_module_irq() is the desc->handle method for each of the twl4030
494 * module interrupts. It executes in kernel thread context.
495 * On entry, cpu interrupts are disabled.
497 static void do_twl4030_module_irq(unsigned int irq, irq_desc_t *desc)
499 struct irqaction *action;
500 const unsigned int cpu = smp_processor_id();
503 * Earlier this was desc->triggered = 1;
505 desc->status |= IRQ_LEVEL;
508 * The desc->handle method would normally call the desc->chip->ack
509 * method here, but we won't bother since our ack method is NULL.
513 kstat_cpu(cpu).irqs[irq]++;
515 action = desc->action;
524 /* Call the ISR with cpu interrupts enabled */
525 ret = action->handler(irq, action->dev_id);
526 if (ret == IRQ_HANDLED)
527 status |= action->flags;
529 action = action->next;
532 if (status & IRQF_SAMPLE_RANDOM)
533 add_interrupt_randomness(irq);
537 if (retval != IRQ_HANDLED)
538 printk(KERN_ERR "ISR for TWL4030 module"
539 " irq %d can't handle interrupt\n",
543 * Here is where we should call the unmask method, but
544 * again we won't bother since it is NULL.
547 printk(KERN_CRIT "TWL4030 module irq %d has no ISR"
548 " but can't be masked!\n", irq);
550 printk(KERN_CRIT "TWL4030 module irq %d is disabled but can't"
551 " be masked!\n", irq);
554 static unsigned twl4030_irq_base;
557 * twl4030_irq_thread() runs as a kernel thread. It queries the twl4030
558 * interrupt controller to see which modules are generating interrupt requests
559 * and then calls the desc->handle method for each module requesting service.
561 static int twl4030_irq_thread(void *data)
564 irq_desc_t *desc = irq_desc + irq;
565 static unsigned i2c_errors;
566 const static unsigned max_i2c_errors = 100;
568 daemonize("twl4030-irq");
569 current->flags |= PF_NOFREEZE;
571 while (!kthread_should_stop()) {
576 wait_for_completion_interruptible(&irq_event);
578 ret = twl4030_i2c_read_u8(TWL4030_MODULE_PIH, &pih_isr,
581 printk(KERN_WARNING "I2C error %d while reading TWL4030"
582 " PIH ISR register.\n", ret);
583 if (++i2c_errors >= max_i2c_errors) {
584 printk(KERN_ERR "Maximum I2C error count"
585 " exceeded. Terminating %s.\n",
592 for (module_irq = twl4030_irq_base; 0 != pih_isr;
593 pih_isr >>= 1, module_irq++) {
595 irq_desc_t *d = irq_desc + module_irq;
599 d->handle_irq(module_irq, d);
605 desc->chip->unmask(irq);
612 * do_twl4030_irq() is the desc->handle method for the twl4030 interrupt.
613 * This is a chained interrupt, so there is no desc->action method for it.
614 * Now we need to query the interrupt controller in the twl4030 to determine
615 * which module is generating the interrupt request. However, we can't do i2c
616 * transactions in interrupt context, so we must defer that work to a kernel
617 * thread. All we do here is acknowledge and mask the interrupt and wakeup
620 static void do_twl4030_irq(unsigned int irq, irq_desc_t *desc)
622 const unsigned int cpu = smp_processor_id();
625 * Earlier this was desc->triggered = 1;
627 desc->status |= IRQ_LEVEL;
630 * Acknowledge, clear _AND_ disable the interrupt.
632 desc->chip->ack(irq);
635 kstat_cpu(cpu).irqs[irq]++;
637 complete(&irq_event);
641 static int add_children(struct twl4030_platform_data *pdata)
643 struct platform_device *pdev = NULL;
644 struct twl4030_client *twl = NULL;
648 pdev = platform_device_alloc("twl4030_rtc", -1);
650 twl = &twl4030_modules[TWL4030_SLAVENUM_NUM3];
651 pdev->dev.parent = &twl->client->dev;
652 device_init_wakeup(&pdev->dev, 1);
655 * FIXME add the relevant IRQ resource, and make the
656 * rtc driver use it instead of hard-wiring ...
658 * REVISIT platform_data here currently only supports
659 * setting up the "msecure" line ... which actually
660 * violates the "princple of least privilege", since
661 * it's effectively always in "high trust" mode.
663 * For now, expect equivalent treatment at board init:
664 * setting msecure high. Eventually, Linux might
665 * become more aware of those HW security concerns.
668 status = platform_device_add(pdev);
670 platform_device_put(pdev);
678 pr_err("failed to add twl4030's children\n");
682 static struct task_struct * __init start_twl4030_irq_thread(int irq)
684 struct task_struct *thread;
686 init_completion(&irq_event);
687 thread = kthread_run(twl4030_irq_thread, (void *)irq,
688 "twl4030 irq %d", irq);
690 pr_err("%s: could not create twl4030 irq %d thread!\n",
697 * These three functions should be part of Voltage frame work
698 * added here to complete the functionality for now.
700 static int __init protect_pm_master(void)
704 e = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_LOCK,
709 static int __init unprotect_pm_master(void)
713 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK1,
715 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK2,
720 static int __init power_companion_init(void)
724 u8 ctrl = HFCLK_FREQ_26_MHZ;
727 if (cpu_is_omap2430())
728 osc = clk_get(NULL, "osc_ck");
730 osc = clk_get(NULL, "osc_sys_ck");
732 printk(KERN_WARNING "Skipping twl3040 internal clock init and "
733 "using bootloader value (unknown osc rate)\n");
737 rate = clk_get_rate(osc);
742 ctrl = HFCLK_FREQ_19p2_MHZ;
745 ctrl = HFCLK_FREQ_26_MHZ;
748 ctrl = HFCLK_FREQ_38p4_MHZ;
752 ctrl |= HIGH_PERF_SQ;
753 e |= unprotect_pm_master();
754 /* effect->MADC+USB ck en */
755 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, ctrl, R_CFG_BOOT);
756 e |= protect_pm_master();
762 * twl4030_i2c_clear_isr - clear TWL4030 SIH ISR regs via read + write
763 * @mod_no: TWL4030 module number
764 * @reg: register index to clear
765 * @cor: value of the <module>_SIH_CTRL.COR bit (1 or 0)
767 * Either reads (cor == 1) or writes (cor == 0) to a TWL4030 interrupt
768 * status register to ensure that any prior interrupts are cleared.
769 * Returns the status from the I2C read operation.
771 static int __init twl4030_i2c_clear_isr(u8 mod_no, u8 reg, u8 cor)
775 return (cor) ? twl4030_i2c_read_u8(mod_no, &tmp, reg) :
776 twl4030_i2c_write_u8(mod_no, 0xff, reg);
780 * twl4030_read_cor_bit - are TWL module ISRs cleared by reads or writes?
781 * @mod_no: TWL4030 module number
782 * @reg: register index to clear
784 * Returns 1 if the TWL4030 SIH interrupt status registers (ISRs) for
785 * the specified TWL module are cleared by reads, or 0 if cleared by
788 static int twl4030_read_cor_bit(u8 mod_no, u8 reg)
792 WARN_ON(twl4030_i2c_read_u8(mod_no, &tmp, reg) < 0);
794 tmp &= TWL4030_SIH_CTRL_COR_MASK;
795 tmp >>= __ffs(TWL4030_SIH_CTRL_COR_MASK);
801 * twl4030_mask_clear_intrs - mask and clear all TWL4030 interrupts
802 * @t: pointer to twl4030_mod_iregs array
803 * @t_sz: ARRAY_SIZE(t) (starting at 1)
805 * Mask all TWL4030 interrupt mask registers (IMRs) and clear all
806 * interrupt status registers (ISRs). No return value, but will WARN if
807 * any I2C operations fail.
809 static void __init twl4030_mask_clear_intrs(const struct twl4030_mod_iregs *t,
815 * N.B. - further efficiency is possible here. Eight I2C
816 * operations on BCI and GPIO modules are avoidable if I2C
817 * burst read/write transactions were implemented. Would
818 * probably save about 1ms of boot time and a small amount of
821 for (i = 0; i < t_sz; i++) {
822 const struct twl4030_mod_iregs tmr = t[i];
825 /* Are ISRs cleared by reads or writes? */
826 cor = twl4030_read_cor_bit(tmr.mod_no, tmr.sih_ctrl);
829 for (j = 0; j < tmr.reg_cnt; j++) {
831 /* Mask interrupts at the TWL4030 */
832 WARN_ON(twl4030_i2c_write_u8(tmr.mod_no, 0xff,
835 /* Clear TWL4030 ISRs */
836 WARN_ON(twl4030_i2c_clear_isr(tmr.mod_no,
837 tmr.isrs[j], cor) < 0);
845 static void twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
849 char *msg = "Unable to register interrupt subsystem";
852 * Mask and clear all TWL4030 interrupts since initially we do
853 * not have any TWL4030 module interrupt handlers present
855 twl4030_mask_clear_intrs(twl4030_mod_regs,
856 ARRAY_SIZE(twl4030_mod_regs));
858 twl4030_irq_base = irq_base;
860 /* install an irq handler for each of the PIH modules */
861 for (i = irq_base; i < irq_end; i++) {
862 set_irq_chip(i, &twl4030_irq_chip);
863 set_irq_handler(i, do_twl4030_module_irq);
864 set_irq_flags(i, IRQF_VALID);
867 /* install an irq handler to demultiplex the TWL4030 interrupt */
868 set_irq_data(irq_num, start_twl4030_irq_thread(irq_num));
869 set_irq_type(irq_num, IRQ_TYPE_EDGE_FALLING);
870 set_irq_chained_handler(irq_num, do_twl4030_irq);
872 res = power_companion_init();
874 pr_err("%s: %s[%d]\n", DRIVER_NAME, msg, res);
877 /*----------------------------------------------------------------------*/
879 static int twl4030_remove(struct i2c_client *client)
883 /* FIXME undo twl_init_irq() */
884 if (twl4030_irq_base) {
885 dev_err(&client->dev, "can't yet clean up IRQs?\n");
889 for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
890 struct twl4030_client *twl = &twl4030_modules[i];
892 if (twl->client && twl->client != client)
893 i2c_unregister_device(twl->client);
894 twl4030_modules[i].client = NULL;
895 twl4030_modules[i].inuse = false;
900 /* NOTE: this driver only handles a single twl4030/tps659x0 chip */
902 twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
906 struct twl4030_platform_data *pdata = client->dev.platform_data;
909 dev_dbg(&client->dev, "no platform data?\n");
913 if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) == 0) {
914 dev_dbg(&client->dev, "can't talk I2C?\n");
918 for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
919 if (twl4030_modules[i].inuse || twl4030_irq_base) {
920 dev_dbg(&client->dev, "driver is already in use\n");
925 for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
926 struct twl4030_client *twl = &twl4030_modules[i];
928 twl->address = client->addr + i;
930 twl->client = client;
932 twl->client = i2c_new_dummy(client->adapter,
935 dev_err(&twl->client->dev,
936 "can't attach client %d\n", i);
940 strlcpy(twl->client->name, id->name,
941 sizeof(twl->client->name));
944 mutex_init(&twl->xfer_lock);
947 status = add_children(pdata);
952 * Check if the PIH module is initialized, if yes, then init
953 * the T2 Interrupt subsystem
955 if (twl4030_modules[twl4030_map[TWL4030_MODULE_PIH].sid].inuse
956 && twl4030_irq_base == 0
959 && pdata->irq_end > pdata->irq_base)
960 twl_init_irq(client->irq, pdata->irq_base, pdata->irq_end);
962 dev_info(&client->dev, "chaining %d irqs\n",
964 ? (pdata->irq_end - pdata->irq_base)
969 twl4030_remove(client);
973 static const struct i2c_device_id twl4030_ids[] = {
974 { "twl4030", 0 }, /* "Triton 2" */
975 { "tps65950", 0 }, /* catalog version of twl4030 */
976 { "tps65930", 0 }, /* fewer LDOs and DACs; no charger */
977 { "tps65920", 0 }, /* fewer LDOs; no codec or charger */
978 { /* end of list */ },
980 MODULE_DEVICE_TABLE(i2c, twl4030_ids);
982 /* One Client Driver , 4 Clients */
983 static struct i2c_driver twl4030_driver = {
984 .driver.name = DRIVER_NAME,
985 .id_table = twl4030_ids,
986 .probe = twl4030_probe,
987 .remove = twl4030_remove,
990 static int __init twl4030_init(void)
992 return i2c_add_driver(&twl4030_driver);
994 subsys_initcall(twl4030_init);
996 static void __exit twl4030_exit(void)
998 i2c_del_driver(&twl4030_driver);
1000 module_exit(twl4030_exit);
1002 MODULE_AUTHOR("Texas Instruments, Inc.");
1003 MODULE_DESCRIPTION("I2C Core interface for TWL4030");
1004 MODULE_LICENSE("GPL");