2 * File: arch/blackfin/kernel/bfin_gpio.c
4 * Author: Michael Hennerich (hennerich@blackfin.uclinux.org)
7 * Description: GPIO Abstraction Layer
10 * Copyright 2008 Analog Devices Inc.
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
31 * Number BF537/6/4 BF561 BF533/2/1 BF549/8/4/2
33 * GPIO_0 PF0 PF0 PF0 PA0...PJ13
43 * GPIO_10 PF10 PF10 PF10
44 * GPIO_11 PF11 PF11 PF11
45 * GPIO_12 PF12 PF12 PF12
46 * GPIO_13 PF13 PF13 PF13
47 * GPIO_14 PF14 PF14 PF14
48 * GPIO_15 PF15 PF15 PF15
83 #include <linux/delay.h>
84 #include <linux/module.h>
85 #include <linux/err.h>
86 #include <linux/proc_fs.h>
87 #include <asm/blackfin.h>
89 #include <asm/portmux.h>
90 #include <linux/irq.h>
92 #if ANOMALY_05000311 || ANOMALY_05000323
95 AWA_data_clear = SYSCR,
98 AWA_maska = BFIN_UART_SCR,
99 AWA_maska_clear = BFIN_UART_SCR,
100 AWA_maska_set = BFIN_UART_SCR,
101 AWA_maska_toggle = BFIN_UART_SCR,
102 AWA_maskb = BFIN_UART_GCTL,
103 AWA_maskb_clear = BFIN_UART_GCTL,
104 AWA_maskb_set = BFIN_UART_GCTL,
105 AWA_maskb_toggle = BFIN_UART_GCTL,
106 AWA_dir = SPORT1_STAT,
107 AWA_polar = SPORT1_STAT,
108 AWA_edge = SPORT1_STAT,
109 AWA_both = SPORT1_STAT,
111 AWA_inen = TIMER_ENABLE,
112 #elif ANOMALY_05000323
113 AWA_inen = DMA1_1_CONFIG,
116 /* Anomaly Workaround */
117 #define AWA_DUMMY_READ(name) bfin_read16(AWA_ ## name)
119 #define AWA_DUMMY_READ(...) do { } while (0)
123 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
124 (struct gpio_port_t *) FIO_FLAG_D,
128 #if defined(BF527_FAMILY) || defined(BF537_FAMILY)
129 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
130 (struct gpio_port_t *) PORTFIO,
131 (struct gpio_port_t *) PORTGIO,
132 (struct gpio_port_t *) PORTHIO,
135 static unsigned short *port_fer[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
136 (unsigned short *) PORTF_FER,
137 (unsigned short *) PORTG_FER,
138 (unsigned short *) PORTH_FER,
143 static unsigned short *port_mux[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
144 (unsigned short *) PORTF_MUX,
145 (unsigned short *) PORTG_MUX,
146 (unsigned short *) PORTH_MUX,
150 u8 pmux_offset[][16] =
151 {{ 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 4, 6, 8, 8, 10, 10 }, /* PORTF */
152 { 0, 0, 0, 0, 0, 2, 2, 4, 4, 6, 8, 10, 10, 10, 12, 12 }, /* PORTG */
153 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 4, 4, 4, 4, 4, 4 }, /* PORTH */
158 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
159 (struct gpio_port_t *) FIO0_FLAG_D,
160 (struct gpio_port_t *) FIO1_FLAG_D,
161 (struct gpio_port_t *) FIO2_FLAG_D,
166 static struct gpio_port_t *gpio_array[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
167 (struct gpio_port_t *)PORTA_FER,
168 (struct gpio_port_t *)PORTB_FER,
169 (struct gpio_port_t *)PORTC_FER,
170 (struct gpio_port_t *)PORTD_FER,
171 (struct gpio_port_t *)PORTE_FER,
172 (struct gpio_port_t *)PORTF_FER,
173 (struct gpio_port_t *)PORTG_FER,
174 (struct gpio_port_t *)PORTH_FER,
175 (struct gpio_port_t *)PORTI_FER,
176 (struct gpio_port_t *)PORTJ_FER,
180 static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
181 static unsigned short reserved_peri_map[gpio_bank(MAX_RESOURCES)];
183 #define RESOURCE_LABEL_SIZE 16
185 static struct str_ident {
186 char name[RESOURCE_LABEL_SIZE];
187 } str_ident[MAX_RESOURCES];
189 #if defined(CONFIG_PM) && !defined(CONFIG_BF54x)
190 static unsigned short wakeup_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
191 static unsigned char wakeup_flags_map[MAX_BLACKFIN_GPIOS];
192 static struct gpio_port_s gpio_bank_saved[gpio_bank(MAX_BLACKFIN_GPIOS)];
195 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB};
199 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX};
203 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PORTF_INTB, IRQ_PORTG_INTB, IRQ_PORTH_INTB};
207 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB};
210 #endif /* CONFIG_PM */
212 #if defined(BF548_FAMILY)
213 inline int check_gpio(unsigned gpio)
215 if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15
216 || gpio == GPIO_PH14 || gpio == GPIO_PH15
217 || gpio == GPIO_PJ14 || gpio == GPIO_PJ15
218 || gpio > MAX_BLACKFIN_GPIOS)
223 inline int check_gpio(unsigned gpio)
225 if (gpio >= MAX_BLACKFIN_GPIOS)
231 void gpio_error(unsigned gpio)
233 printk(KERN_ERR "bfin-gpio: GPIO %d wasn't requested!\n", gpio);
236 static void set_label(unsigned short ident, const char *label)
238 if (label && str_ident) {
239 strncpy(str_ident[ident].name, label,
240 RESOURCE_LABEL_SIZE);
241 str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
245 static char *get_label(unsigned short ident)
250 return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN");
253 static int cmp_label(unsigned short ident, const char *label)
257 printk(KERN_ERR "Please provide none-null label\n");
260 if (label && str_ident)
261 return strncmp(str_ident[ident].name,
262 label, strlen(label));
267 #if defined(BF527_FAMILY) || defined(BF537_FAMILY)
268 static void port_setup(unsigned gpio, unsigned short usage)
270 if (!check_gpio(gpio)) {
271 if (usage == GPIO_USAGE)
272 *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
274 *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
278 #elif defined(BF548_FAMILY)
279 static void port_setup(unsigned gpio, unsigned short usage)
281 if (usage == GPIO_USAGE)
282 gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
284 gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
288 # define port_setup(...) do { } while (0)
294 unsigned short offset;
296 {.res = P_PPI0_D13, .offset = 11},
297 {.res = P_PPI0_D14, .offset = 11},
298 {.res = P_PPI0_D15, .offset = 11},
299 {.res = P_SPORT1_TFS, .offset = 11},
300 {.res = P_SPORT1_TSCLK, .offset = 11},
301 {.res = P_SPORT1_DTPRI, .offset = 11},
302 {.res = P_PPI0_D10, .offset = 10},
303 {.res = P_PPI0_D11, .offset = 10},
304 {.res = P_PPI0_D12, .offset = 10},
305 {.res = P_SPORT1_RSCLK, .offset = 10},
306 {.res = P_SPORT1_RFS, .offset = 10},
307 {.res = P_SPORT1_DRPRI, .offset = 10},
308 {.res = P_PPI0_D8, .offset = 9},
309 {.res = P_PPI0_D9, .offset = 9},
310 {.res = P_SPORT1_DRSEC, .offset = 9},
311 {.res = P_SPORT1_DTSEC, .offset = 9},
312 {.res = P_TMR2, .offset = 8},
313 {.res = P_PPI0_FS3, .offset = 8},
314 {.res = P_TMR3, .offset = 7},
315 {.res = P_SPI0_SSEL4, .offset = 7},
316 {.res = P_TMR4, .offset = 6},
317 {.res = P_SPI0_SSEL5, .offset = 6},
318 {.res = P_TMR5, .offset = 5},
319 {.res = P_SPI0_SSEL6, .offset = 5},
320 {.res = P_UART1_RX, .offset = 4},
321 {.res = P_UART1_TX, .offset = 4},
322 {.res = P_TMR6, .offset = 4},
323 {.res = P_TMR7, .offset = 4},
324 {.res = P_UART0_RX, .offset = 3},
325 {.res = P_UART0_TX, .offset = 3},
326 {.res = P_DMAR0, .offset = 3},
327 {.res = P_DMAR1, .offset = 3},
328 {.res = P_SPORT0_DTSEC, .offset = 1},
329 {.res = P_SPORT0_DRSEC, .offset = 1},
330 {.res = P_CAN0_RX, .offset = 1},
331 {.res = P_CAN0_TX, .offset = 1},
332 {.res = P_SPI0_SSEL7, .offset = 1},
333 {.res = P_SPORT0_TFS, .offset = 0},
334 {.res = P_SPORT0_DTPRI, .offset = 0},
335 {.res = P_SPI0_SSEL2, .offset = 0},
336 {.res = P_SPI0_SSEL3, .offset = 0},
339 static void portmux_setup(unsigned short per, unsigned short function)
341 u16 y, offset, muxreg;
343 for (y = 0; y < ARRAY_SIZE(port_mux_lut); y++) {
344 if (port_mux_lut[y].res == per) {
346 /* SET PORTMUX REG */
348 offset = port_mux_lut[y].offset;
349 muxreg = bfin_read_PORT_MUX();
352 muxreg &= ~(1 << offset);
356 muxreg |= (function << offset);
357 bfin_write_PORT_MUX(muxreg);
361 #elif defined(BF548_FAMILY)
362 inline void portmux_setup(unsigned short portno, unsigned short function)
366 pmux = gpio_array[gpio_bank(portno)]->port_mux;
368 pmux &= ~(0x3 << (2 * gpio_sub_n(portno)));
369 pmux |= (function & 0x3) << (2 * gpio_sub_n(portno));
371 gpio_array[gpio_bank(portno)]->port_mux = pmux;
374 inline u16 get_portmux(unsigned short portno)
378 pmux = gpio_array[gpio_bank(portno)]->port_mux;
380 return (pmux >> (2 * gpio_sub_n(portno)) & 0x3);
382 #elif defined(BF527_FAMILY)
383 inline void portmux_setup(unsigned short portno, unsigned short function)
385 u16 pmux, ident = P_IDENT(portno);
386 u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
388 pmux = *port_mux[gpio_bank(ident)];
389 pmux &= ~(3 << offset);
390 pmux |= (function & 3) << offset;
391 *port_mux[gpio_bank(ident)] = pmux;
395 # define portmux_setup(...) do { } while (0)
398 static int __init bfin_gpio_init(void)
400 printk(KERN_INFO "Blackfin GPIO Controller\n");
404 arch_initcall(bfin_gpio_init);
408 /***********************************************************
410 * FUNCTIONS: Blackfin General Purpose Ports Access Functions
413 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
416 * DESCRIPTION: These functions abstract direct register access
417 * to Blackfin processor General Purpose
420 * CAUTION: These functions do not belong to the GPIO Driver API
421 *************************************************************
422 * MODIFICATION HISTORY :
423 **************************************************************/
425 /* Set a specific bit */
427 #define SET_GPIO(name) \
428 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
430 unsigned long flags; \
431 local_irq_save(flags); \
433 gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
435 gpio_bankb[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
436 AWA_DUMMY_READ(name); \
437 local_irq_restore(flags); \
439 EXPORT_SYMBOL(set_gpio_ ## name);
448 #if ANOMALY_05000311 || ANOMALY_05000323
449 #define SET_GPIO_SC(name) \
450 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
452 unsigned long flags; \
453 local_irq_save(flags); \
455 gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
457 gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
458 AWA_DUMMY_READ(name); \
459 local_irq_restore(flags); \
461 EXPORT_SYMBOL(set_gpio_ ## name);
463 #define SET_GPIO_SC(name) \
464 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
467 gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
469 gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
471 EXPORT_SYMBOL(set_gpio_ ## name);
478 #if ANOMALY_05000311 || ANOMALY_05000323
479 void set_gpio_toggle(unsigned gpio)
482 local_irq_save(flags);
483 gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
484 AWA_DUMMY_READ(toggle);
485 local_irq_restore(flags);
488 void set_gpio_toggle(unsigned gpio)
490 gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
493 EXPORT_SYMBOL(set_gpio_toggle);
496 /*Set current PORT date (16-bit word)*/
498 #if ANOMALY_05000311 || ANOMALY_05000323
499 #define SET_GPIO_P(name) \
500 void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
502 unsigned long flags; \
503 local_irq_save(flags); \
504 gpio_bankb[gpio_bank(gpio)]->name = arg; \
505 AWA_DUMMY_READ(name); \
506 local_irq_restore(flags); \
508 EXPORT_SYMBOL(set_gpiop_ ## name);
510 #define SET_GPIO_P(name) \
511 void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
513 gpio_bankb[gpio_bank(gpio)]->name = arg; \
515 EXPORT_SYMBOL(set_gpiop_ ## name);
527 /* Get a specific bit */
528 #if ANOMALY_05000311 || ANOMALY_05000323
529 #define GET_GPIO(name) \
530 unsigned short get_gpio_ ## name(unsigned gpio) \
532 unsigned long flags; \
533 unsigned short ret; \
534 local_irq_save(flags); \
535 ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \
536 AWA_DUMMY_READ(name); \
537 local_irq_restore(flags); \
540 EXPORT_SYMBOL(get_gpio_ ## name);
542 #define GET_GPIO(name) \
543 unsigned short get_gpio_ ## name(unsigned gpio) \
545 return (0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio))); \
547 EXPORT_SYMBOL(get_gpio_ ## name);
559 /*Get current PORT date (16-bit word)*/
561 #if ANOMALY_05000311 || ANOMALY_05000323
562 #define GET_GPIO_P(name) \
563 unsigned short get_gpiop_ ## name(unsigned gpio) \
565 unsigned long flags; \
566 unsigned short ret; \
567 local_irq_save(flags); \
568 ret = (gpio_bankb[gpio_bank(gpio)]->name); \
569 AWA_DUMMY_READ(name); \
570 local_irq_restore(flags); \
573 EXPORT_SYMBOL(get_gpiop_ ## name);
575 #define GET_GPIO_P(name) \
576 unsigned short get_gpiop_ ## name(unsigned gpio) \
578 return (gpio_bankb[gpio_bank(gpio)]->name);\
580 EXPORT_SYMBOL(get_gpiop_ ## name);
594 /***********************************************************
596 * FUNCTIONS: Blackfin PM Setup API
599 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
607 * DESCRIPTION: Blackfin PM Driver API
610 *************************************************************
611 * MODIFICATION HISTORY :
612 **************************************************************/
613 int gpio_pm_wakeup_request(unsigned gpio, unsigned char type)
617 if ((check_gpio(gpio) < 0) || !type)
620 local_irq_save(flags);
621 wakeup_map[gpio_bank(gpio)] |= gpio_bit(gpio);
622 wakeup_flags_map[gpio] = type;
623 local_irq_restore(flags);
627 EXPORT_SYMBOL(gpio_pm_wakeup_request);
629 void gpio_pm_wakeup_free(unsigned gpio)
633 if (check_gpio(gpio) < 0)
636 local_irq_save(flags);
638 wakeup_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
640 local_irq_restore(flags);
642 EXPORT_SYMBOL(gpio_pm_wakeup_free);
644 static int bfin_gpio_wakeup_type(unsigned gpio, unsigned char type)
646 port_setup(gpio, GPIO_USAGE);
647 set_gpio_dir(gpio, 0);
648 set_gpio_inen(gpio, 1);
650 if (type & (PM_WAKE_RISING | PM_WAKE_FALLING))
651 set_gpio_edge(gpio, 1);
653 set_gpio_edge(gpio, 0);
655 if ((type & (PM_WAKE_BOTH_EDGES)) == (PM_WAKE_BOTH_EDGES))
656 set_gpio_both(gpio, 1);
658 set_gpio_both(gpio, 0);
660 if ((type & (PM_WAKE_FALLING | PM_WAKE_LOW)))
661 set_gpio_polar(gpio, 1);
663 set_gpio_polar(gpio, 0);
670 u32 bfin_pm_setup(void)
672 u16 bank, mask, i, gpio;
674 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
675 mask = wakeup_map[gpio_bank(i)];
678 gpio_bank_saved[bank].maskb = gpio_bankb[bank]->maskb;
679 gpio_bankb[bank]->maskb = 0;
683 gpio_bank_saved[bank].fer = *port_fer[bank];
685 gpio_bank_saved[bank].inen = gpio_bankb[bank]->inen;
686 gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar;
687 gpio_bank_saved[bank].dir = gpio_bankb[bank]->dir;
688 gpio_bank_saved[bank].edge = gpio_bankb[bank]->edge;
689 gpio_bank_saved[bank].both = gpio_bankb[bank]->both;
690 gpio_bank_saved[bank].reserved =
691 reserved_gpio_map[bank];
696 if ((mask & 1) && (wakeup_flags_map[gpio] !=
698 reserved_gpio_map[gpio_bank(gpio)] |=
700 bfin_gpio_wakeup_type(gpio,
701 wakeup_flags_map[gpio]);
702 set_gpio_data(gpio, 0); /*Clear*/
708 bfin_internal_set_wake(sic_iwr_irqs[bank], 1);
709 gpio_bankb[bank]->maskb_set = wakeup_map[gpio_bank(i)];
713 AWA_DUMMY_READ(maskb_set);
718 void bfin_pm_restore(void)
722 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
723 mask = wakeup_map[gpio_bank(i)];
728 *port_fer[bank] = gpio_bank_saved[bank].fer;
730 gpio_bankb[bank]->inen = gpio_bank_saved[bank].inen;
731 gpio_bankb[bank]->dir = gpio_bank_saved[bank].dir;
732 gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar;
733 gpio_bankb[bank]->edge = gpio_bank_saved[bank].edge;
734 gpio_bankb[bank]->both = gpio_bank_saved[bank].both;
736 reserved_gpio_map[bank] =
737 gpio_bank_saved[bank].reserved;
738 bfin_internal_set_wake(sic_iwr_irqs[bank], 0);
741 gpio_bankb[bank]->maskb = gpio_bank_saved[bank].maskb;
743 AWA_DUMMY_READ(maskb);
747 #else /* BF548_FAMILY */
749 unsigned short get_gpio_dir(unsigned gpio)
751 return (0x01 & (gpio_array[gpio_bank(gpio)]->port_dir_clear >> gpio_sub_n(gpio)));
753 EXPORT_SYMBOL(get_gpio_dir);
755 #endif /* BF548_FAMILY */
757 /***********************************************************
759 * FUNCTIONS: Blackfin Peripheral Resource Allocation
763 * per Peripheral Identifier
766 * DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API
769 *************************************************************
770 * MODIFICATION HISTORY :
771 **************************************************************/
774 int peripheral_request(unsigned short per, const char *label)
777 unsigned short ident = P_IDENT(per);
780 * Don't cares are pins with only one dedicated function
783 if (per & P_DONTCARE)
786 if (!(per & P_DEFINED))
789 if (check_gpio(ident) < 0)
792 local_irq_save(flags);
794 if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
797 "%s: Peripheral %d is already reserved as GPIO by %s !\n",
798 __func__, ident, get_label(ident));
799 local_irq_restore(flags);
803 if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
805 u16 funct = get_portmux(ident);
808 * Pin functions like AMC address strobes my
809 * be requested and used by several drivers
812 if (!((per & P_MAYSHARE) && (funct == P_FUNCT2MUX(per)))) {
815 * Allow that the identical pin function can
816 * be requested from the same driver twice
819 if (cmp_label(ident, label) == 0)
824 "%s: Peripheral %d function %d is already reserved by %s !\n",
825 __func__, ident, P_FUNCT2MUX(per), get_label(ident));
826 local_irq_restore(flags);
832 reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
834 portmux_setup(ident, P_FUNCT2MUX(per));
835 port_setup(ident, PERIPHERAL_USAGE);
837 local_irq_restore(flags);
838 set_label(ident, label);
842 EXPORT_SYMBOL(peripheral_request);
845 int peripheral_request(unsigned short per, const char *label)
848 unsigned short ident = P_IDENT(per);
851 * Don't cares are pins with only one dedicated function
854 if (per & P_DONTCARE)
857 if (!(per & P_DEFINED))
860 local_irq_save(flags);
862 if (!check_gpio(ident)) {
864 if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
867 "%s: Peripheral %d is already reserved as GPIO by %s !\n",
868 __func__, ident, get_label(ident));
869 local_irq_restore(flags);
875 if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
878 * Pin functions like AMC address strobes my
879 * be requested and used by several drivers
882 if (!(per & P_MAYSHARE)) {
885 * Allow that the identical pin function can
886 * be requested from the same driver twice
889 if (cmp_label(ident, label) == 0)
894 "%s: Peripheral %d function %d is already"
895 " reserved by %s !\n",
896 __func__, ident, P_FUNCT2MUX(per),
898 local_irq_restore(flags);
905 portmux_setup(per, P_FUNCT2MUX(per));
907 port_setup(ident, PERIPHERAL_USAGE);
909 reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
910 local_irq_restore(flags);
911 set_label(ident, label);
915 EXPORT_SYMBOL(peripheral_request);
918 int peripheral_request_list(const unsigned short per[], const char *label)
923 for (cnt = 0; per[cnt] != 0; cnt++) {
925 ret = peripheral_request(per[cnt], label);
928 for ( ; cnt > 0; cnt--)
929 peripheral_free(per[cnt - 1]);
937 EXPORT_SYMBOL(peripheral_request_list);
939 void peripheral_free(unsigned short per)
942 unsigned short ident = P_IDENT(per);
944 if (per & P_DONTCARE)
947 if (!(per & P_DEFINED))
950 if (check_gpio(ident) < 0)
953 local_irq_save(flags);
955 if (unlikely(!(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident)))) {
956 local_irq_restore(flags);
960 if (!(per & P_MAYSHARE))
961 port_setup(ident, GPIO_USAGE);
963 reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);
965 set_label(ident, "free");
967 local_irq_restore(flags);
969 EXPORT_SYMBOL(peripheral_free);
971 void peripheral_free_list(const unsigned short per[])
974 for (cnt = 0; per[cnt] != 0; cnt++)
975 peripheral_free(per[cnt]);
977 EXPORT_SYMBOL(peripheral_free_list);
979 /***********************************************************
981 * FUNCTIONS: Blackfin GPIO Driver
984 * gpio PIO Number between 0 and MAX_BLACKFIN_GPIOS
987 * DESCRIPTION: Blackfin GPIO Driver API
990 *************************************************************
991 * MODIFICATION HISTORY :
992 **************************************************************/
994 int gpio_request(unsigned gpio, const char *label)
998 if (check_gpio(gpio) < 0)
1001 local_irq_save(flags);
1004 * Allow that the identical GPIO can
1005 * be requested from the same driver twice
1006 * Do nothing and return -
1009 if (cmp_label(gpio, label) == 0) {
1010 local_irq_restore(flags);
1014 if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1016 printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
1017 gpio, get_label(gpio));
1018 local_irq_restore(flags);
1021 if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1024 "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
1025 gpio, get_label(gpio));
1026 local_irq_restore(flags);
1030 reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
1032 local_irq_restore(flags);
1034 port_setup(gpio, GPIO_USAGE);
1035 set_label(gpio, label);
1039 EXPORT_SYMBOL(gpio_request);
1041 void gpio_free(unsigned gpio)
1043 unsigned long flags;
1045 if (check_gpio(gpio) < 0)
1048 local_irq_save(flags);
1050 if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
1053 local_irq_restore(flags);
1057 reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
1059 set_label(gpio, "free");
1061 local_irq_restore(flags);
1063 EXPORT_SYMBOL(gpio_free);
1067 int gpio_direction_input(unsigned gpio)
1069 unsigned long flags;
1071 if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1076 local_irq_save(flags);
1077 gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
1078 gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
1079 local_irq_restore(flags);
1083 EXPORT_SYMBOL(gpio_direction_input);
1085 int gpio_direction_output(unsigned gpio, int value)
1087 unsigned long flags;
1089 if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1094 local_irq_save(flags);
1095 gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio);
1096 gpio_set_value(gpio, value);
1097 gpio_array[gpio_bank(gpio)]->port_dir_set = gpio_bit(gpio);
1098 local_irq_restore(flags);
1102 EXPORT_SYMBOL(gpio_direction_output);
1104 void gpio_set_value(unsigned gpio, int arg)
1107 gpio_array[gpio_bank(gpio)]->port_set = gpio_bit(gpio);
1109 gpio_array[gpio_bank(gpio)]->port_clear = gpio_bit(gpio);
1111 EXPORT_SYMBOL(gpio_set_value);
1113 int gpio_get_value(unsigned gpio)
1115 return (1 & (gpio_array[gpio_bank(gpio)]->port_data >> gpio_sub_n(gpio)));
1117 EXPORT_SYMBOL(gpio_get_value);
1119 void bfin_gpio_irq_prepare(unsigned gpio)
1121 unsigned long flags;
1123 port_setup(gpio, GPIO_USAGE);
1125 local_irq_save(flags);
1126 gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
1127 gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
1128 local_irq_restore(flags);
1133 int gpio_get_value(unsigned gpio)
1135 unsigned long flags;
1138 if (unlikely(get_gpio_edge(gpio))) {
1139 local_irq_save(flags);
1140 set_gpio_edge(gpio, 0);
1141 ret = get_gpio_data(gpio);
1142 set_gpio_edge(gpio, 1);
1143 local_irq_restore(flags);
1147 return get_gpio_data(gpio);
1149 EXPORT_SYMBOL(gpio_get_value);
1152 int gpio_direction_input(unsigned gpio)
1154 unsigned long flags;
1156 if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1161 local_irq_save(flags);
1162 gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
1163 gpio_bankb[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
1164 AWA_DUMMY_READ(inen);
1165 local_irq_restore(flags);
1169 EXPORT_SYMBOL(gpio_direction_input);
1171 int gpio_direction_output(unsigned gpio, int value)
1173 unsigned long flags;
1175 if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1180 local_irq_save(flags);
1181 gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
1184 gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
1186 gpio_bankb[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
1188 gpio_bankb[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
1189 AWA_DUMMY_READ(dir);
1190 local_irq_restore(flags);
1194 EXPORT_SYMBOL(gpio_direction_output);
1196 /* If we are booting from SPI and our board lacks a strong enough pull up,
1197 * the core can reset and execute the bootrom faster than the resistor can
1198 * pull the signal logically high. To work around this (common) error in
1199 * board design, we explicitly set the pin back to GPIO mode, force /CS
1200 * high, and wait for the electrons to do their thing.
1202 * This function only makes sense to be called from reset code, but it
1203 * lives here as we need to force all the GPIO states w/out going through
1204 * BUG() checks and such.
1206 void bfin_gpio_reset_spi0_ssel1(void)
1208 u16 gpio = P_IDENT(P_SPI0_SSEL1);
1210 port_setup(gpio, GPIO_USAGE);
1211 gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
1212 AWA_DUMMY_READ(data_set);
1216 void bfin_gpio_irq_prepare(unsigned gpio)
1218 port_setup(gpio, GPIO_USAGE);
1221 #endif /*BF548_FAMILY */
1223 #if defined(CONFIG_PROC_FS)
1224 static int gpio_proc_read(char *buf, char **start, off_t offset,
1225 int len, int *unused_i, void *unused_v)
1229 for (c = 0; c < MAX_RESOURCES; c++) {
1230 if (!check_gpio(c) && (reserved_gpio_map[gpio_bank(c)] & gpio_bit(c)))
1231 len = sprintf(buf, "GPIO_%d: %s \t\tGPIO %s\n", c,
1232 get_label(c), get_gpio_dir(c) ? "OUTPUT" : "INPUT");
1233 else if (reserved_peri_map[gpio_bank(c)] & gpio_bit(c))
1234 len = sprintf(buf, "GPIO_%d: %s \t\tPeripheral\n", c, get_label(c));
1243 static __init int gpio_register_proc(void)
1245 struct proc_dir_entry *proc_gpio;
1247 proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL);
1249 proc_gpio->read_proc = gpio_proc_read;
1250 return proc_gpio != NULL;
1252 __initcall(gpio_register_proc);