1 /*
2 * GPIO Abstraction Layer
3 *
4 * Copyright 2006-2010 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later
7 */
8
9 #include <linux/delay.h>
10 #include <linux/module.h>
11 #include <linux/err.h>
12 #include <linux/proc_fs.h>
13 #include <asm/blackfin.h>
14 #include <asm/gpio.h>
15 #include <asm/portmux.h>
16 #include <linux/irq.h>
17
18 #if ANOMALY_05000311 || ANOMALY_05000323
19 enum {
20 AWA_data = SYSCR,
21 AWA_data_clear = SYSCR,
22 AWA_data_set = SYSCR,
23 AWA_toggle = SYSCR,
24 AWA_maska = BFIN_UART_SCR,
25 AWA_maska_clear = BFIN_UART_SCR,
26 AWA_maska_set = BFIN_UART_SCR,
27 AWA_maska_toggle = BFIN_UART_SCR,
28 AWA_maskb = BFIN_UART_GCTL,
29 AWA_maskb_clear = BFIN_UART_GCTL,
30 AWA_maskb_set = BFIN_UART_GCTL,
31 AWA_maskb_toggle = BFIN_UART_GCTL,
32 AWA_dir = SPORT1_STAT,
33 AWA_polar = SPORT1_STAT,
34 AWA_edge = SPORT1_STAT,
35 AWA_both = SPORT1_STAT,
36 #if ANOMALY_05000311
37 AWA_inen = TIMER_ENABLE,
38 #elif ANOMALY_05000323
39 AWA_inen = DMA1_1_CONFIG,
40 #endif
41 };
42 /* Anomaly Workaround */
43 #define AWA_DUMMY_READ(name) bfin_read16(AWA_ ## name)
44 #else
45 #define AWA_DUMMY_READ(...) do { } while (0)
46 #endif
47
48 static struct gpio_port_t * const gpio_array[] = {
49 #if defined(BF533_FAMILY) || defined(BF538_FAMILY)
50 (struct gpio_port_t *) FIO_FLAG_D,
51 #elif defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
52 (struct gpio_port_t *) PORTFIO,
53 (struct gpio_port_t *) PORTGIO,
54 (struct gpio_port_t *) PORTHIO,
55 #elif defined(BF561_FAMILY)
56 (struct gpio_port_t *) FIO0_FLAG_D,
57 (struct gpio_port_t *) FIO1_FLAG_D,
58 (struct gpio_port_t *) FIO2_FLAG_D,
59 #elif defined(CONFIG_BF54x)
60 (struct gpio_port_t *)PORTA_FER,
61 (struct gpio_port_t *)PORTB_FER,
62 (struct gpio_port_t *)PORTC_FER,
63 (struct gpio_port_t *)PORTD_FER,
64 (struct gpio_port_t *)PORTE_FER,
65 (struct gpio_port_t *)PORTF_FER,
66 (struct gpio_port_t *)PORTG_FER,
67 (struct gpio_port_t *)PORTH_FER,
68 (struct gpio_port_t *)PORTI_FER,
69 (struct gpio_port_t *)PORTJ_FER,
70 #else
71 # error no gpio arrays defined
72 #endif
73 };
74
75 #if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
76 static unsigned short * const port_fer[] = {
77 (unsigned short *) PORTF_FER,
78 (unsigned short *) PORTG_FER,
79 (unsigned short *) PORTH_FER,
80 };
81
82 # if !defined(BF537_FAMILY)
83 static unsigned short * const port_mux[] = {
84 (unsigned short *) PORTF_MUX,
85 (unsigned short *) PORTG_MUX,
86 (unsigned short *) PORTH_MUX,
87 };
88
89 static const
90 u8 pmux_offset[][16] = {
91 # if defined(CONFIG_BF52x)
92 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 4, 6, 8, 8, 10, 10 }, /* PORTF */
93 { 0, 0, 0, 0, 0, 2, 2, 4, 4, 6, 8, 10, 10, 10, 12, 12 }, /* PORTG */
94 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 4, 4, 4, 4, 4, 4 }, /* PORTH */
95 # elif defined(CONFIG_BF51x)
96 { 0, 2, 2, 2, 2, 2, 2, 4, 6, 6, 6, 8, 8, 8, 8, 10 }, /* PORTF */
97 { 0, 0, 0, 2, 4, 6, 6, 6, 8, 10, 10, 12, 14, 14, 14, 14 }, /* PORTG */
98 { 0, 0, 0, 0, 2, 2, 4, 6, 10, 10, 10, 10, 10, 10, 10, 10 }, /* PORTH */
99 # endif
100 };
101 # endif
102
103 #elif defined(BF538_FAMILY)
104 static unsigned short * const port_fer[] = {
105 (unsigned short *) PORTCIO_FER,
106 (unsigned short *) PORTDIO_FER,
107 (unsigned short *) PORTEIO_FER,
108 };
109 #endif
110
111 #define RESOURCE_LABEL_SIZE 16
112
113 static struct str_ident {
114 char name[RESOURCE_LABEL_SIZE];
115 } str_ident[MAX_RESOURCES];
116
117 #if defined(CONFIG_PM)
118 static struct gpio_port_s gpio_bank_saved[GPIO_BANK_NUM];
119 #endif
120
gpio_error(unsigned gpio)121 static void gpio_error(unsigned gpio)
122 {
123 printk(KERN_ERR "bfin-gpio: GPIO %d wasn't requested!\n", gpio);
124 }
125
set_label(unsigned short ident,const char * label)126 static void set_label(unsigned short ident, const char *label)
127 {
128 if (label) {
129 strncpy(str_ident[ident].name, label,
130 RESOURCE_LABEL_SIZE);
131 str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
132 }
133 }
134
get_label(unsigned short ident)135 static char *get_label(unsigned short ident)
136 {
137 return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN");
138 }
139
cmp_label(unsigned short ident,const char * label)140 static int cmp_label(unsigned short ident, const char *label)
141 {
142 if (label == NULL) {
143 dump_stack();
144 printk(KERN_ERR "Please provide none-null label\n");
145 }
146
147 if (label)
148 return strcmp(str_ident[ident].name, label);
149 else
150 return -EINVAL;
151 }
152
153 #define map_entry(m, i) reserved_##m##_map[gpio_bank(i)]
154 #define is_reserved(m, i, e) (map_entry(m, i) & gpio_bit(i))
155 #define reserve(m, i) (map_entry(m, i) |= gpio_bit(i))
156 #define unreserve(m, i) (map_entry(m, i) &= ~gpio_bit(i))
157 #define DECLARE_RESERVED_MAP(m, c) static unsigned short reserved_##m##_map[c]
158
159 DECLARE_RESERVED_MAP(gpio, GPIO_BANK_NUM);
160 DECLARE_RESERVED_MAP(peri, DIV_ROUND_UP(MAX_RESOURCES, GPIO_BANKSIZE));
161 DECLARE_RESERVED_MAP(gpio_irq, GPIO_BANK_NUM);
162
check_gpio(unsigned gpio)163 inline int check_gpio(unsigned gpio)
164 {
165 #if defined(CONFIG_BF54x)
166 if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15
167 || gpio == GPIO_PH14 || gpio == GPIO_PH15
168 || gpio == GPIO_PJ14 || gpio == GPIO_PJ15)
169 return -EINVAL;
170 #endif
171 if (gpio >= MAX_BLACKFIN_GPIOS)
172 return -EINVAL;
173 return 0;
174 }
175
port_setup(unsigned gpio,unsigned short usage)176 static void port_setup(unsigned gpio, unsigned short usage)
177 {
178 #if defined(BF538_FAMILY)
179 /*
180 * BF538/9 Port C,D and E are special.
181 * Inverted PORT_FER polarity on CDE and no PORF_FER on F
182 * Regular PORT F GPIOs are handled here, CDE are exclusively
183 * managed by GPIOLIB
184 */
185
186 if (gpio < MAX_BLACKFIN_GPIOS || gpio >= MAX_RESOURCES)
187 return;
188
189 gpio -= MAX_BLACKFIN_GPIOS;
190
191 if (usage == GPIO_USAGE)
192 *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
193 else
194 *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
195 SSYNC();
196 return;
197 #endif
198
199 if (check_gpio(gpio))
200 return;
201
202 #if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
203 if (usage == GPIO_USAGE)
204 *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
205 else
206 *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
207 SSYNC();
208 #elif defined(CONFIG_BF54x)
209 if (usage == GPIO_USAGE)
210 gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
211 else
212 gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
213 SSYNC();
214 #endif
215 }
216
217 #ifdef BF537_FAMILY
218 static const s8 port_mux[] = {
219 [GPIO_PF0] = 3,
220 [GPIO_PF1] = 3,
221 [GPIO_PF2] = 4,
222 [GPIO_PF3] = 4,
223 [GPIO_PF4] = 5,
224 [GPIO_PF5] = 6,
225 [GPIO_PF6] = 7,
226 [GPIO_PF7] = 8,
227 [GPIO_PF8 ... GPIO_PF15] = -1,
228 [GPIO_PG0 ... GPIO_PG7] = -1,
229 [GPIO_PG8] = 9,
230 [GPIO_PG9] = 9,
231 [GPIO_PG10] = 10,
232 [GPIO_PG11] = 10,
233 [GPIO_PG12] = 10,
234 [GPIO_PG13] = 11,
235 [GPIO_PG14] = 11,
236 [GPIO_PG15] = 11,
237 [GPIO_PH0 ... GPIO_PH15] = -1,
238 [PORT_PJ0 ... PORT_PJ3] = -1,
239 [PORT_PJ4] = 1,
240 [PORT_PJ5] = 1,
241 [PORT_PJ6 ... PORT_PJ9] = -1,
242 [PORT_PJ10] = 0,
243 [PORT_PJ11] = 0,
244 };
245
portmux_group_check(unsigned short per)246 static int portmux_group_check(unsigned short per)
247 {
248 u16 ident = P_IDENT(per);
249 u16 function = P_FUNCT2MUX(per);
250 s8 offset = port_mux[ident];
251 u16 m, pmux, pfunc;
252
253 if (offset < 0)
254 return 0;
255
256 pmux = bfin_read_PORT_MUX();
257 for (m = 0; m < ARRAY_SIZE(port_mux); ++m) {
258 if (m == ident)
259 continue;
260 if (port_mux[m] != offset)
261 continue;
262 if (!is_reserved(peri, m, 1))
263 continue;
264
265 if (offset == 1)
266 pfunc = (pmux >> offset) & 3;
267 else
268 pfunc = (pmux >> offset) & 1;
269 if (pfunc != function) {
270 pr_err("pin group conflict! request pin %d func %d conflict with pin %d func %d\n",
271 ident, function, m, pfunc);
272 return -EINVAL;
273 }
274 }
275
276 return 0;
277 }
278
portmux_setup(unsigned short per)279 static void portmux_setup(unsigned short per)
280 {
281 u16 ident = P_IDENT(per);
282 u16 function = P_FUNCT2MUX(per);
283 s8 offset = port_mux[ident];
284 u16 pmux;
285
286 if (offset == -1)
287 return;
288
289 pmux = bfin_read_PORT_MUX();
290 if (offset != 1)
291 pmux &= ~(1 << offset);
292 else
293 pmux &= ~(3 << 1);
294 pmux |= (function << offset);
295 bfin_write_PORT_MUX(pmux);
296 }
297 #elif defined(CONFIG_BF54x)
portmux_setup(unsigned short per)298 inline void portmux_setup(unsigned short per)
299 {
300 u16 ident = P_IDENT(per);
301 u16 function = P_FUNCT2MUX(per);
302 u32 pmux;
303
304 pmux = gpio_array[gpio_bank(ident)]->port_mux;
305
306 pmux &= ~(0x3 << (2 * gpio_sub_n(ident)));
307 pmux |= (function & 0x3) << (2 * gpio_sub_n(ident));
308
309 gpio_array[gpio_bank(ident)]->port_mux = pmux;
310 }
311
get_portmux(unsigned short per)312 inline u16 get_portmux(unsigned short per)
313 {
314 u16 ident = P_IDENT(per);
315 u32 pmux = gpio_array[gpio_bank(ident)]->port_mux;
316 return (pmux >> (2 * gpio_sub_n(ident)) & 0x3);
317 }
portmux_group_check(unsigned short per)318 static int portmux_group_check(unsigned short per)
319 {
320 return 0;
321 }
322 #elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
portmux_group_check(unsigned short per)323 static int portmux_group_check(unsigned short per)
324 {
325 u16 ident = P_IDENT(per);
326 u16 function = P_FUNCT2MUX(per);
327 u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
328 u16 pin, gpiopin, pfunc;
329
330 for (pin = 0; pin < GPIO_BANKSIZE; ++pin) {
331 if (offset != pmux_offset[gpio_bank(ident)][pin])
332 continue;
333
334 gpiopin = gpio_bank(ident) * GPIO_BANKSIZE + pin;
335 if (gpiopin == ident)
336 continue;
337 if (!is_reserved(peri, gpiopin, 1))
338 continue;
339
340 pfunc = *port_mux[gpio_bank(ident)];
341 pfunc = (pfunc >> offset) & 3;
342 if (pfunc != function) {
343 pr_err("pin group conflict! request pin %d func %d conflict with pin %d func %d\n",
344 ident, function, gpiopin, pfunc);
345 return -EINVAL;
346 }
347 }
348
349 return 0;
350 }
351
portmux_setup(unsigned short per)352 inline void portmux_setup(unsigned short per)
353 {
354 u16 ident = P_IDENT(per);
355 u16 function = P_FUNCT2MUX(per);
356 u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
357 u16 pmux;
358
359 pmux = *port_mux[gpio_bank(ident)];
360 if (((pmux >> offset) & 3) == function)
361 return;
362 pmux &= ~(3 << offset);
363 pmux |= (function & 3) << offset;
364 *port_mux[gpio_bank(ident)] = pmux;
365 SSYNC();
366 }
367 #else
368 # define portmux_setup(...) do { } while (0)
portmux_group_check(unsigned short per)369 static int portmux_group_check(unsigned short per)
370 {
371 return 0;
372 }
373 #endif
374
375 #ifndef CONFIG_BF54x
376 /***********************************************************
377 *
378 * FUNCTIONS: Blackfin General Purpose Ports Access Functions
379 *
380 * INPUTS/OUTPUTS:
381 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
382 *
383 *
384 * DESCRIPTION: These functions abstract direct register access
385 * to Blackfin processor General Purpose
386 * Ports Regsiters
387 *
388 * CAUTION: These functions do not belong to the GPIO Driver API
389 *************************************************************
390 * MODIFICATION HISTORY :
391 **************************************************************/
392
393 /* Set a specific bit */
394
395 #define SET_GPIO(name) \
396 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
397 { \
398 unsigned long flags; \
399 flags = hard_local_irq_save(); \
400 if (arg) \
401 gpio_array[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
402 else \
403 gpio_array[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
404 AWA_DUMMY_READ(name); \
405 hard_local_irq_restore(flags); \
406 } \
407 EXPORT_SYMBOL(set_gpio_ ## name);
408
409 SET_GPIO(dir) /* set_gpio_dir() */
SET_GPIO(inen)410 SET_GPIO(inen) /* set_gpio_inen() */
411 SET_GPIO(polar) /* set_gpio_polar() */
412 SET_GPIO(edge) /* set_gpio_edge() */
413 SET_GPIO(both) /* set_gpio_both() */
414
415
416 #define SET_GPIO_SC(name) \
417 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
418 { \
419 unsigned long flags; \
420 if (ANOMALY_05000311 || ANOMALY_05000323) \
421 flags = hard_local_irq_save(); \
422 if (arg) \
423 gpio_array[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
424 else \
425 gpio_array[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
426 if (ANOMALY_05000311 || ANOMALY_05000323) { \
427 AWA_DUMMY_READ(name); \
428 hard_local_irq_restore(flags); \
429 } \
430 } \
431 EXPORT_SYMBOL(set_gpio_ ## name);
432
433 SET_GPIO_SC(maska)
434 SET_GPIO_SC(maskb)
435 SET_GPIO_SC(data)
436
437 void set_gpio_toggle(unsigned gpio)
438 {
439 unsigned long flags;
440 if (ANOMALY_05000311 || ANOMALY_05000323)
441 flags = hard_local_irq_save();
442 gpio_array[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
443 if (ANOMALY_05000311 || ANOMALY_05000323) {
444 AWA_DUMMY_READ(toggle);
445 hard_local_irq_restore(flags);
446 }
447 }
448 EXPORT_SYMBOL(set_gpio_toggle);
449
450
451 /*Set current PORT date (16-bit word)*/
452
453 #define SET_GPIO_P(name) \
454 void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
455 { \
456 unsigned long flags; \
457 if (ANOMALY_05000311 || ANOMALY_05000323) \
458 flags = hard_local_irq_save(); \
459 gpio_array[gpio_bank(gpio)]->name = arg; \
460 if (ANOMALY_05000311 || ANOMALY_05000323) { \
461 AWA_DUMMY_READ(name); \
462 hard_local_irq_restore(flags); \
463 } \
464 } \
465 EXPORT_SYMBOL(set_gpiop_ ## name);
466
467 SET_GPIO_P(data)
468 SET_GPIO_P(dir)
469 SET_GPIO_P(inen)
470 SET_GPIO_P(polar)
471 SET_GPIO_P(edge)
472 SET_GPIO_P(both)
473 SET_GPIO_P(maska)
474 SET_GPIO_P(maskb)
475
476 /* Get a specific bit */
477 #define GET_GPIO(name) \
478 unsigned short get_gpio_ ## name(unsigned gpio) \
479 { \
480 unsigned long flags; \
481 unsigned short ret; \
482 if (ANOMALY_05000311 || ANOMALY_05000323) \
483 flags = hard_local_irq_save(); \
484 ret = 0x01 & (gpio_array[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \
485 if (ANOMALY_05000311 || ANOMALY_05000323) { \
486 AWA_DUMMY_READ(name); \
487 hard_local_irq_restore(flags); \
488 } \
489 return ret; \
490 } \
491 EXPORT_SYMBOL(get_gpio_ ## name);
492
493 GET_GPIO(data)
494 GET_GPIO(dir)
495 GET_GPIO(inen)
496 GET_GPIO(polar)
497 GET_GPIO(edge)
498 GET_GPIO(both)
499 GET_GPIO(maska)
500 GET_GPIO(maskb)
501
502 /*Get current PORT date (16-bit word)*/
503
504 #define GET_GPIO_P(name) \
505 unsigned short get_gpiop_ ## name(unsigned gpio) \
506 { \
507 unsigned long flags; \
508 unsigned short ret; \
509 if (ANOMALY_05000311 || ANOMALY_05000323) \
510 flags = hard_local_irq_save(); \
511 ret = (gpio_array[gpio_bank(gpio)]->name); \
512 if (ANOMALY_05000311 || ANOMALY_05000323) { \
513 AWA_DUMMY_READ(name); \
514 hard_local_irq_restore(flags); \
515 } \
516 return ret; \
517 } \
518 EXPORT_SYMBOL(get_gpiop_ ## name);
519
520 GET_GPIO_P(data)
521 GET_GPIO_P(dir)
522 GET_GPIO_P(inen)
523 GET_GPIO_P(polar)
524 GET_GPIO_P(edge)
525 GET_GPIO_P(both)
526 GET_GPIO_P(maska)
527 GET_GPIO_P(maskb)
528
529
530 #ifdef CONFIG_PM
531 DECLARE_RESERVED_MAP(wakeup, GPIO_BANK_NUM);
532
533 static const unsigned int sic_iwr_irqs[] = {
534 #if defined(BF533_FAMILY)
535 IRQ_PROG_INTB
536 #elif defined(BF537_FAMILY)
537 IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX
538 #elif defined(BF538_FAMILY)
539 IRQ_PORTF_INTB
540 #elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
541 IRQ_PORTF_INTB, IRQ_PORTG_INTB, IRQ_PORTH_INTB
542 #elif defined(BF561_FAMILY)
543 IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB
544 #else
545 # error no SIC_IWR defined
546 #endif
547 };
548
549 /***********************************************************
550 *
551 * FUNCTIONS: Blackfin PM Setup API
552 *
553 * INPUTS/OUTPUTS:
554 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
555 * type -
556 * PM_WAKE_RISING
557 * PM_WAKE_FALLING
558 * PM_WAKE_HIGH
559 * PM_WAKE_LOW
560 * PM_WAKE_BOTH_EDGES
561 *
562 * DESCRIPTION: Blackfin PM Driver API
563 *
564 * CAUTION:
565 *************************************************************
566 * MODIFICATION HISTORY :
567 **************************************************************/
gpio_pm_wakeup_ctrl(unsigned gpio,unsigned ctrl)568 int gpio_pm_wakeup_ctrl(unsigned gpio, unsigned ctrl)
569 {
570 unsigned long flags;
571
572 if (check_gpio(gpio) < 0)
573 return -EINVAL;
574
575 flags = hard_local_irq_save();
576 if (ctrl)
577 reserve(wakeup, gpio);
578 else
579 unreserve(wakeup, gpio);
580
581 set_gpio_maskb(gpio, ctrl);
582 hard_local_irq_restore(flags);
583
584 return 0;
585 }
586
bfin_pm_standby_ctrl(unsigned ctrl)587 int bfin_pm_standby_ctrl(unsigned ctrl)
588 {
589 u16 bank, mask, i;
590
591 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
592 mask = map_entry(wakeup, i);
593 bank = gpio_bank(i);
594
595 if (mask)
596 bfin_internal_set_wake(sic_iwr_irqs[bank], ctrl);
597 }
598 return 0;
599 }
600
bfin_gpio_pm_hibernate_suspend(void)601 void bfin_gpio_pm_hibernate_suspend(void)
602 {
603 int i, bank;
604
605 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
606 bank = gpio_bank(i);
607
608 #if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
609 gpio_bank_saved[bank].fer = *port_fer[bank];
610 #if defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
611 gpio_bank_saved[bank].mux = *port_mux[bank];
612 #else
613 if (bank == 0)
614 gpio_bank_saved[bank].mux = bfin_read_PORT_MUX();
615 #endif
616 #endif
617 gpio_bank_saved[bank].data = gpio_array[bank]->data;
618 gpio_bank_saved[bank].inen = gpio_array[bank]->inen;
619 gpio_bank_saved[bank].polar = gpio_array[bank]->polar;
620 gpio_bank_saved[bank].dir = gpio_array[bank]->dir;
621 gpio_bank_saved[bank].edge = gpio_array[bank]->edge;
622 gpio_bank_saved[bank].both = gpio_array[bank]->both;
623 gpio_bank_saved[bank].maska = gpio_array[bank]->maska;
624 }
625
626 AWA_DUMMY_READ(maska);
627 }
628
bfin_gpio_pm_hibernate_restore(void)629 void bfin_gpio_pm_hibernate_restore(void)
630 {
631 int i, bank;
632
633 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
634 bank = gpio_bank(i);
635
636 #if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
637 #if defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
638 *port_mux[bank] = gpio_bank_saved[bank].mux;
639 #else
640 if (bank == 0)
641 bfin_write_PORT_MUX(gpio_bank_saved[bank].mux);
642 #endif
643 *port_fer[bank] = gpio_bank_saved[bank].fer;
644 #endif
645 gpio_array[bank]->inen = gpio_bank_saved[bank].inen;
646 gpio_array[bank]->data_set = gpio_bank_saved[bank].data
647 & gpio_bank_saved[bank].dir;
648 gpio_array[bank]->dir = gpio_bank_saved[bank].dir;
649 gpio_array[bank]->polar = gpio_bank_saved[bank].polar;
650 gpio_array[bank]->edge = gpio_bank_saved[bank].edge;
651 gpio_array[bank]->both = gpio_bank_saved[bank].both;
652 gpio_array[bank]->maska = gpio_bank_saved[bank].maska;
653 }
654 AWA_DUMMY_READ(maska);
655 }
656
657
658 #endif
659 #else /* CONFIG_BF54x */
660 #ifdef CONFIG_PM
661
bfin_pm_standby_ctrl(unsigned ctrl)662 int bfin_pm_standby_ctrl(unsigned ctrl)
663 {
664 return 0;
665 }
666
bfin_gpio_pm_hibernate_suspend(void)667 void bfin_gpio_pm_hibernate_suspend(void)
668 {
669 int i, bank;
670
671 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
672 bank = gpio_bank(i);
673
674 gpio_bank_saved[bank].fer = gpio_array[bank]->port_fer;
675 gpio_bank_saved[bank].mux = gpio_array[bank]->port_mux;
676 gpio_bank_saved[bank].data = gpio_array[bank]->data;
677 gpio_bank_saved[bank].inen = gpio_array[bank]->inen;
678 gpio_bank_saved[bank].dir = gpio_array[bank]->dir_set;
679 }
680 }
681
bfin_gpio_pm_hibernate_restore(void)682 void bfin_gpio_pm_hibernate_restore(void)
683 {
684 int i, bank;
685
686 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
687 bank = gpio_bank(i);
688
689 gpio_array[bank]->port_mux = gpio_bank_saved[bank].mux;
690 gpio_array[bank]->port_fer = gpio_bank_saved[bank].fer;
691 gpio_array[bank]->inen = gpio_bank_saved[bank].inen;
692 gpio_array[bank]->dir_set = gpio_bank_saved[bank].dir;
693 gpio_array[bank]->data_set = gpio_bank_saved[bank].data
694 | gpio_bank_saved[bank].dir;
695 }
696 }
697 #endif
698
get_gpio_dir(unsigned gpio)699 unsigned short get_gpio_dir(unsigned gpio)
700 {
701 return (0x01 & (gpio_array[gpio_bank(gpio)]->dir_clear >> gpio_sub_n(gpio)));
702 }
703 EXPORT_SYMBOL(get_gpio_dir);
704
705 #endif /* CONFIG_BF54x */
706
707 /***********************************************************
708 *
709 * FUNCTIONS: Blackfin Peripheral Resource Allocation
710 * and PortMux Setup
711 *
712 * INPUTS/OUTPUTS:
713 * per Peripheral Identifier
714 * label String
715 *
716 * DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API
717 *
718 * CAUTION:
719 *************************************************************
720 * MODIFICATION HISTORY :
721 **************************************************************/
722
peripheral_request(unsigned short per,const char * label)723 int peripheral_request(unsigned short per, const char *label)
724 {
725 unsigned long flags;
726 unsigned short ident = P_IDENT(per);
727
728 /*
729 * Don't cares are pins with only one dedicated function
730 */
731
732 if (per & P_DONTCARE)
733 return 0;
734
735 if (!(per & P_DEFINED))
736 return -ENODEV;
737
738 BUG_ON(ident >= MAX_RESOURCES);
739
740 flags = hard_local_irq_save();
741
742 /* If a pin can be muxed as either GPIO or peripheral, make
743 * sure it is not already a GPIO pin when we request it.
744 */
745 if (unlikely(!check_gpio(ident) && is_reserved(gpio, ident, 1))) {
746 if (system_state == SYSTEM_BOOTING)
747 dump_stack();
748 printk(KERN_ERR
749 "%s: Peripheral %d is already reserved as GPIO by %s !\n",
750 __func__, ident, get_label(ident));
751 hard_local_irq_restore(flags);
752 return -EBUSY;
753 }
754
755 if (unlikely(is_reserved(peri, ident, 1))) {
756
757 /*
758 * Pin functions like AMC address strobes my
759 * be requested and used by several drivers
760 */
761
762 #ifdef CONFIG_BF54x
763 if (!((per & P_MAYSHARE) && get_portmux(per) == P_FUNCT2MUX(per))) {
764 #else
765 if (!(per & P_MAYSHARE)) {
766 #endif
767 /*
768 * Allow that the identical pin function can
769 * be requested from the same driver twice
770 */
771
772 if (cmp_label(ident, label) == 0)
773 goto anyway;
774
775 if (system_state == SYSTEM_BOOTING)
776 dump_stack();
777 printk(KERN_ERR
778 "%s: Peripheral %d function %d is already reserved by %s !\n",
779 __func__, ident, P_FUNCT2MUX(per), get_label(ident));
780 hard_local_irq_restore(flags);
781 return -EBUSY;
782 }
783 }
784
785 if (unlikely(portmux_group_check(per))) {
786 hard_local_irq_restore(flags);
787 return -EBUSY;
788 }
789 anyway:
790 reserve(peri, ident);
791
792 portmux_setup(per);
793 port_setup(ident, PERIPHERAL_USAGE);
794
795 hard_local_irq_restore(flags);
796 set_label(ident, label);
797
798 return 0;
799 }
800 EXPORT_SYMBOL(peripheral_request);
801
802 int peripheral_request_list(const unsigned short per[], const char *label)
803 {
804 u16 cnt;
805 int ret;
806
807 for (cnt = 0; per[cnt] != 0; cnt++) {
808
809 ret = peripheral_request(per[cnt], label);
810
811 if (ret < 0) {
812 for ( ; cnt > 0; cnt--)
813 peripheral_free(per[cnt - 1]);
814
815 return ret;
816 }
817 }
818
819 return 0;
820 }
821 EXPORT_SYMBOL(peripheral_request_list);
822
823 void peripheral_free(unsigned short per)
824 {
825 unsigned long flags;
826 unsigned short ident = P_IDENT(per);
827
828 if (per & P_DONTCARE)
829 return;
830
831 if (!(per & P_DEFINED))
832 return;
833
834 flags = hard_local_irq_save();
835
836 if (unlikely(!is_reserved(peri, ident, 0))) {
837 hard_local_irq_restore(flags);
838 return;
839 }
840
841 if (!(per & P_MAYSHARE))
842 port_setup(ident, GPIO_USAGE);
843
844 unreserve(peri, ident);
845
846 set_label(ident, "free");
847
848 hard_local_irq_restore(flags);
849 }
850 EXPORT_SYMBOL(peripheral_free);
851
852 void peripheral_free_list(const unsigned short per[])
853 {
854 u16 cnt;
855 for (cnt = 0; per[cnt] != 0; cnt++)
856 peripheral_free(per[cnt]);
857 }
858 EXPORT_SYMBOL(peripheral_free_list);
859
860 /***********************************************************
861 *
862 * FUNCTIONS: Blackfin GPIO Driver
863 *
864 * INPUTS/OUTPUTS:
865 * gpio PIO Number between 0 and MAX_BLACKFIN_GPIOS
866 * label String
867 *
868 * DESCRIPTION: Blackfin GPIO Driver API
869 *
870 * CAUTION:
871 *************************************************************
872 * MODIFICATION HISTORY :
873 **************************************************************/
874
875 int bfin_gpio_request(unsigned gpio, const char *label)
876 {
877 unsigned long flags;
878
879 if (check_gpio(gpio) < 0)
880 return -EINVAL;
881
882 flags = hard_local_irq_save();
883
884 /*
885 * Allow that the identical GPIO can
886 * be requested from the same driver twice
887 * Do nothing and return -
888 */
889
890 if (cmp_label(gpio, label) == 0) {
891 hard_local_irq_restore(flags);
892 return 0;
893 }
894
895 if (unlikely(is_reserved(gpio, gpio, 1))) {
896 if (system_state == SYSTEM_BOOTING)
897 dump_stack();
898 printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
899 gpio, get_label(gpio));
900 hard_local_irq_restore(flags);
901 return -EBUSY;
902 }
903 if (unlikely(is_reserved(peri, gpio, 1))) {
904 if (system_state == SYSTEM_BOOTING)
905 dump_stack();
906 printk(KERN_ERR
907 "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
908 gpio, get_label(gpio));
909 hard_local_irq_restore(flags);
910 return -EBUSY;
911 }
912 if (unlikely(is_reserved(gpio_irq, gpio, 1))) {
913 printk(KERN_NOTICE "bfin-gpio: GPIO %d is already reserved as gpio-irq!"
914 " (Documentation/blackfin/bfin-gpio-notes.txt)\n", gpio);
915 }
916 #ifndef CONFIG_BF54x
917 else { /* Reset POLAR setting when acquiring a gpio for the first time */
918 set_gpio_polar(gpio, 0);
919 }
920 #endif
921
922 reserve(gpio, gpio);
923 set_label(gpio, label);
924
925 hard_local_irq_restore(flags);
926
927 port_setup(gpio, GPIO_USAGE);
928
929 return 0;
930 }
931 EXPORT_SYMBOL(bfin_gpio_request);
932
933 void bfin_gpio_free(unsigned gpio)
934 {
935 unsigned long flags;
936
937 if (check_gpio(gpio) < 0)
938 return;
939
940 might_sleep();
941
942 flags = hard_local_irq_save();
943
944 if (unlikely(!is_reserved(gpio, gpio, 0))) {
945 if (system_state == SYSTEM_BOOTING)
946 dump_stack();
947 gpio_error(gpio);
948 hard_local_irq_restore(flags);
949 return;
950 }
951
952 unreserve(gpio, gpio);
953
954 set_label(gpio, "free");
955
956 hard_local_irq_restore(flags);
957 }
958 EXPORT_SYMBOL(bfin_gpio_free);
959
960 #ifdef BFIN_SPECIAL_GPIO_BANKS
961 DECLARE_RESERVED_MAP(special_gpio, gpio_bank(MAX_RESOURCES));
962
963 int bfin_special_gpio_request(unsigned gpio, const char *label)
964 {
965 unsigned long flags;
966
967 flags = hard_local_irq_save();
968
969 /*
970 * Allow that the identical GPIO can
971 * be requested from the same driver twice
972 * Do nothing and return -
973 */
974
975 if (cmp_label(gpio, label) == 0) {
976 hard_local_irq_restore(flags);
977 return 0;
978 }
979
980 if (unlikely(is_reserved(special_gpio, gpio, 1))) {
981 hard_local_irq_restore(flags);
982 printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
983 gpio, get_label(gpio));
984
985 return -EBUSY;
986 }
987 if (unlikely(is_reserved(peri, gpio, 1))) {
988 hard_local_irq_restore(flags);
989 printk(KERN_ERR
990 "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
991 gpio, get_label(gpio));
992
993 return -EBUSY;
994 }
995
996 reserve(special_gpio, gpio);
997 reserve(peri, gpio);
998
999 set_label(gpio, label);
1000 hard_local_irq_restore(flags);
1001 port_setup(gpio, GPIO_USAGE);
1002
1003 return 0;
1004 }
1005 EXPORT_SYMBOL(bfin_special_gpio_request);
1006
1007 void bfin_special_gpio_free(unsigned gpio)
1008 {
1009 unsigned long flags;
1010
1011 might_sleep();
1012
1013 flags = hard_local_irq_save();
1014
1015 if (unlikely(!is_reserved(special_gpio, gpio, 0))) {
1016 gpio_error(gpio);
1017 hard_local_irq_restore(flags);
1018 return;
1019 }
1020
1021 unreserve(special_gpio, gpio);
1022 unreserve(peri, gpio);
1023 set_label(gpio, "free");
1024 hard_local_irq_restore(flags);
1025 }
1026 EXPORT_SYMBOL(bfin_special_gpio_free);
1027 #endif
1028
1029
1030 int bfin_gpio_irq_request(unsigned gpio, const char *label)
1031 {
1032 unsigned long flags;
1033
1034 if (check_gpio(gpio) < 0)
1035 return -EINVAL;
1036
1037 flags = hard_local_irq_save();
1038
1039 if (unlikely(is_reserved(peri, gpio, 1))) {
1040 if (system_state == SYSTEM_BOOTING)
1041 dump_stack();
1042 printk(KERN_ERR
1043 "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
1044 gpio, get_label(gpio));
1045 hard_local_irq_restore(flags);
1046 return -EBUSY;
1047 }
1048 if (unlikely(is_reserved(gpio, gpio, 1)))
1049 printk(KERN_NOTICE "bfin-gpio: GPIO %d is already reserved by %s! "
1050 "(Documentation/blackfin/bfin-gpio-notes.txt)\n",
1051 gpio, get_label(gpio));
1052
1053 reserve(gpio_irq, gpio);
1054 set_label(gpio, label);
1055
1056 hard_local_irq_restore(flags);
1057
1058 port_setup(gpio, GPIO_USAGE);
1059
1060 return 0;
1061 }
1062
1063 void bfin_gpio_irq_free(unsigned gpio)
1064 {
1065 unsigned long flags;
1066
1067 if (check_gpio(gpio) < 0)
1068 return;
1069
1070 flags = hard_local_irq_save();
1071
1072 if (unlikely(!is_reserved(gpio_irq, gpio, 0))) {
1073 if (system_state == SYSTEM_BOOTING)
1074 dump_stack();
1075 gpio_error(gpio);
1076 hard_local_irq_restore(flags);
1077 return;
1078 }
1079
1080 unreserve(gpio_irq, gpio);
1081
1082 set_label(gpio, "free");
1083
1084 hard_local_irq_restore(flags);
1085 }
1086
1087 static inline void __bfin_gpio_direction_input(unsigned gpio)
1088 {
1089 #ifdef CONFIG_BF54x
1090 gpio_array[gpio_bank(gpio)]->dir_clear = gpio_bit(gpio);
1091 #else
1092 gpio_array[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
1093 #endif
1094 gpio_array[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
1095 }
1096
1097 int bfin_gpio_direction_input(unsigned gpio)
1098 {
1099 unsigned long flags;
1100
1101 if (unlikely(!is_reserved(gpio, gpio, 0))) {
1102 gpio_error(gpio);
1103 return -EINVAL;
1104 }
1105
1106 flags = hard_local_irq_save();
1107 __bfin_gpio_direction_input(gpio);
1108 AWA_DUMMY_READ(inen);
1109 hard_local_irq_restore(flags);
1110
1111 return 0;
1112 }
1113 EXPORT_SYMBOL(bfin_gpio_direction_input);
1114
1115 void bfin_gpio_irq_prepare(unsigned gpio)
1116 {
1117 #ifdef CONFIG_BF54x
1118 unsigned long flags;
1119 #endif
1120
1121 port_setup(gpio, GPIO_USAGE);
1122
1123 #ifdef CONFIG_BF54x
1124 flags = hard_local_irq_save();
1125 __bfin_gpio_direction_input(gpio);
1126 hard_local_irq_restore(flags);
1127 #endif
1128 }
1129
1130 void bfin_gpio_set_value(unsigned gpio, int arg)
1131 {
1132 if (arg)
1133 gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
1134 else
1135 gpio_array[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
1136 }
1137 EXPORT_SYMBOL(bfin_gpio_set_value);
1138
1139 int bfin_gpio_direction_output(unsigned gpio, int value)
1140 {
1141 unsigned long flags;
1142
1143 if (unlikely(!is_reserved(gpio, gpio, 0))) {
1144 gpio_error(gpio);
1145 return -EINVAL;
1146 }
1147
1148 flags = hard_local_irq_save();
1149
1150 gpio_array[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
1151 gpio_set_value(gpio, value);
1152 #ifdef CONFIG_BF54x
1153 gpio_array[gpio_bank(gpio)]->dir_set = gpio_bit(gpio);
1154 #else
1155 gpio_array[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
1156 #endif
1157
1158 AWA_DUMMY_READ(dir);
1159 hard_local_irq_restore(flags);
1160
1161 return 0;
1162 }
1163 EXPORT_SYMBOL(bfin_gpio_direction_output);
1164
1165 int bfin_gpio_get_value(unsigned gpio)
1166 {
1167 #ifdef CONFIG_BF54x
1168 return (1 & (gpio_array[gpio_bank(gpio)]->data >> gpio_sub_n(gpio)));
1169 #else
1170 unsigned long flags;
1171
1172 if (unlikely(get_gpio_edge(gpio))) {
1173 int ret;
1174 flags = hard_local_irq_save();
1175 set_gpio_edge(gpio, 0);
1176 ret = get_gpio_data(gpio);
1177 set_gpio_edge(gpio, 1);
1178 hard_local_irq_restore(flags);
1179 return ret;
1180 } else
1181 return get_gpio_data(gpio);
1182 #endif
1183 }
1184 EXPORT_SYMBOL(bfin_gpio_get_value);
1185
1186 /* If we are booting from SPI and our board lacks a strong enough pull up,
1187 * the core can reset and execute the bootrom faster than the resistor can
1188 * pull the signal logically high. To work around this (common) error in
1189 * board design, we explicitly set the pin back to GPIO mode, force /CS
1190 * high, and wait for the electrons to do their thing.
1191 *
1192 * This function only makes sense to be called from reset code, but it
1193 * lives here as we need to force all the GPIO states w/out going through
1194 * BUG() checks and such.
1195 */
1196 void bfin_reset_boot_spi_cs(unsigned short pin)
1197 {
1198 unsigned short gpio = P_IDENT(pin);
1199 port_setup(gpio, GPIO_USAGE);
1200 gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
1201 AWA_DUMMY_READ(data_set);
1202 udelay(1);
1203 }
1204
1205 #if defined(CONFIG_PROC_FS)
1206 static int gpio_proc_read(char *buf, char **start, off_t offset,
1207 int len, int *unused_i, void *unused_v)
1208 {
1209 int c, irq, gpio, outlen = 0;
1210
1211 for (c = 0; c < MAX_RESOURCES; c++) {
1212 irq = is_reserved(gpio_irq, c, 1);
1213 gpio = is_reserved(gpio, c, 1);
1214 if (!check_gpio(c) && (gpio || irq))
1215 len = sprintf(buf, "GPIO_%d: \t%s%s \t\tGPIO %s\n", c,
1216 get_label(c), (gpio && irq) ? " *" : "",
1217 get_gpio_dir(c) ? "OUTPUT" : "INPUT");
1218 else if (is_reserved(peri, c, 1))
1219 len = sprintf(buf, "GPIO_%d: \t%s \t\tPeripheral\n", c, get_label(c));
1220 else
1221 continue;
1222 buf += len;
1223 outlen += len;
1224 }
1225 return outlen;
1226 }
1227
1228 static __init int gpio_register_proc(void)
1229 {
1230 struct proc_dir_entry *proc_gpio;
1231
1232 proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL);
1233 if (proc_gpio)
1234 proc_gpio->read_proc = gpio_proc_read;
1235 return proc_gpio != NULL;
1236 }
1237 __initcall(gpio_register_proc);
1238 #endif
1239
1240 #ifdef CONFIG_GPIOLIB
1241 static int bfin_gpiolib_direction_input(struct gpio_chip *chip, unsigned gpio)
1242 {
1243 return bfin_gpio_direction_input(gpio);
1244 }
1245
1246 static int bfin_gpiolib_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
1247 {
1248 return bfin_gpio_direction_output(gpio, level);
1249 }
1250
1251 static int bfin_gpiolib_get_value(struct gpio_chip *chip, unsigned gpio)
1252 {
1253 return bfin_gpio_get_value(gpio);
1254 }
1255
1256 static void bfin_gpiolib_set_value(struct gpio_chip *chip, unsigned gpio, int value)
1257 {
1258 return bfin_gpio_set_value(gpio, value);
1259 }
1260
1261 static int bfin_gpiolib_gpio_request(struct gpio_chip *chip, unsigned gpio)
1262 {
1263 return bfin_gpio_request(gpio, chip->label);
1264 }
1265
1266 static void bfin_gpiolib_gpio_free(struct gpio_chip *chip, unsigned gpio)
1267 {
1268 return bfin_gpio_free(gpio);
1269 }
1270
1271 static int bfin_gpiolib_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
1272 {
1273 return gpio + GPIO_IRQ_BASE;
1274 }
1275
1276 static struct gpio_chip bfin_chip = {
1277 .label = "BFIN-GPIO",
1278 .direction_input = bfin_gpiolib_direction_input,
1279 .get = bfin_gpiolib_get_value,
1280 .direction_output = bfin_gpiolib_direction_output,
1281 .set = bfin_gpiolib_set_value,
1282 .request = bfin_gpiolib_gpio_request,
1283 .free = bfin_gpiolib_gpio_free,
1284 .to_irq = bfin_gpiolib_gpio_to_irq,
1285 .base = 0,
1286 .ngpio = MAX_BLACKFIN_GPIOS,
1287 };
1288
1289 static int __init bfin_gpiolib_setup(void)
1290 {
1291 return gpiochip_add(&bfin_chip);
1292 }
1293 arch_initcall(bfin_gpiolib_setup);
1294 #endif
1295