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-rw-r--r--drivers/mfd/twl4030-core.c421
1 files changed, 17 insertions, 404 deletions
diff --git a/drivers/mfd/twl4030-core.c b/drivers/mfd/twl4030-core.c
index fd9a0160202c..dd843c4fbcc7 100644
--- a/drivers/mfd/twl4030-core.c
+++ b/drivers/mfd/twl4030-core.c
@@ -27,15 +27,11 @@
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 */ 28 */
29 29
30#include <linux/kernel_stat.h>
31#include <linux/init.h> 30#include <linux/init.h>
32#include <linux/mutex.h> 31#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> 32#include <linux/platform_device.h>
38#include <linux/clk.h> 33#include <linux/clk.h>
34#include <linux/err.h>
39 35
40#include <linux/i2c.h> 36#include <linux/i2c.h>
41#include <linux/i2c/twl4030.h> 37#include <linux/i2c/twl4030.h>
@@ -93,26 +89,6 @@
93#define twl_has_usb() false 89#define twl_has_usb() false
94#endif 90#endif
95 91
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 92
117/* Triton Core internal information (BEGIN) */ 93/* Triton Core internal information (BEGIN) */
118 94
@@ -175,138 +151,6 @@ static inline void activate_irq(int irq)
175 151
176/*----------------------------------------------------------------------*/ 152/*----------------------------------------------------------------------*/
177 153
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? */ 154/* is driver active, bound to a chip? */
311static bool inuse; 155static bool inuse;
312 156
@@ -367,33 +211,6 @@ static struct twl4030mapping twl4030_map[TWL4030_MODULE_LAST + 1] = {
367 211
368/*----------------------------------------------------------------------*/ 212/*----------------------------------------------------------------------*/
369 213
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 */ 214/* Exported Functions */
398 215
399/** 216/**
@@ -535,108 +352,11 @@ EXPORT_SYMBOL(twl4030_i2c_read_u8);
535 352
536/*----------------------------------------------------------------------*/ 353/*----------------------------------------------------------------------*/
537 354
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/* 355/*
597 * do_twl4030_irq() is the desc->handle method for the twl4030 interrupt. 356 * NOTE: We know the first 8 IRQs after pdata->base_irq are
598 * This is a chained interrupt, so there is no desc->action method for it. 357 * for the PIH, and the next are for the PWR_INT SIH, since
599 * Now we need to query the interrupt controller in the twl4030 to determine 358 * that's how twl_init_irq() sets things up.
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 */ 359 */
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/*----------------------------------------------------------------------*/
640 360
641static int add_children(struct twl4030_platform_data *pdata) 361static int add_children(struct twl4030_platform_data *pdata)
642{ 362{
@@ -668,7 +388,7 @@ static int add_children(struct twl4030_platform_data *pdata)
668 388
669 if (status == 0) { 389 if (status == 0) {
670 struct resource r = { 390 struct resource r = {
671 .start = TWL4030_PWRIRQ_CHG_PRES, 391 .start = pdata->irq_base + 8 + 1,
672 .flags = IORESOURCE_IRQ, 392 .flags = IORESOURCE_IRQ,
673 }; 393 };
674 394
@@ -817,8 +537,7 @@ static int add_children(struct twl4030_platform_data *pdata)
817 /* RTC module IRQ */ 537 /* RTC module IRQ */
818 if (status == 0) { 538 if (status == 0) {
819 struct resource r = { 539 struct resource r = {
820 /* REVISIT don't hard-wire this stuff */ 540 .start = pdata->irq_base + 8 + 3,
821 .start = TWL4030_PWRIRQ_RTC,
822 .flags = IORESOURCE_IRQ, 541 .flags = IORESOURCE_IRQ,
823 }; 542 };
824 543
@@ -863,7 +582,7 @@ static int add_children(struct twl4030_platform_data *pdata)
863 582
864 if (status == 0) { 583 if (status == 0) {
865 struct resource r = { 584 struct resource r = {
866 .start = TWL4030_PWRIRQ_USB_PRES, 585 .start = pdata->irq_base + 8 + 2,
867 .flags = IORESOURCE_IRQ, 586 .flags = IORESOURCE_IRQ,
868 }; 587 };
869 588
@@ -965,123 +684,17 @@ static void __init clocks_init(void)
965 684
966/*----------------------------------------------------------------------*/ 685/*----------------------------------------------------------------------*/
967 686
968/** 687int twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end);
969 * twl4030_i2c_clear_isr - clear TWL4030 SIH ISR regs via read + write 688int twl_exit_irq(void);
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 689
1076static int twl4030_remove(struct i2c_client *client) 690static int twl4030_remove(struct i2c_client *client)
1077{ 691{
1078 unsigned i; 692 unsigned i;
693 int status;
1079 694
1080 /* FIXME undo twl_init_irq() */ 695 status = twl_exit_irq();
1081 if (twl4030_irq_base) { 696 if (status < 0)
1082 dev_err(&client->dev, "can't yet clean up IRQs?\n"); 697 return status;
1083 return -ENOSYS;
1084 }
1085 698
1086 for (i = 0; i < TWL4030_NUM_SLAVES; i++) { 699 for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
1087 struct twl4030_client *twl = &twl4030_modules[i]; 700 struct twl4030_client *twl = &twl4030_modules[i];
@@ -1112,7 +725,7 @@ twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
1112 return -EIO; 725 return -EIO;
1113 } 726 }
1114 727
1115 if (inuse || twl4030_irq_base) { 728 if (inuse) {
1116 dev_dbg(&client->dev, "driver is already in use\n"); 729 dev_dbg(&client->dev, "driver is already in use\n");
1117 return -EBUSY; 730 return -EBUSY;
1118 } 731 }
@@ -1146,9 +759,9 @@ twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
1146 if (client->irq 759 if (client->irq
1147 && pdata->irq_base 760 && pdata->irq_base
1148 && pdata->irq_end > pdata->irq_base) { 761 && pdata->irq_end > pdata->irq_base) {
1149 twl_init_irq(client->irq, pdata->irq_base, pdata->irq_end); 762 status = twl_init_irq(client->irq, pdata->irq_base, pdata->irq_end);
1150 dev_info(&client->dev, "IRQ %d chains IRQs %d..%d\n", 763 if (status < 0)
1151 client->irq, pdata->irq_base, pdata->irq_end - 1); 764 goto fail;
1152 } 765 }
1153 766
1154 status = add_children(pdata); 767 status = add_children(pdata);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 14:55:37 -0500