2 * File: arch/blackfin/kernel/bfin_gpio.c
4 * Author: Michael Hennerich (hennerich@blackfin.uclinux.org)
7 * Description: GPIO Abstraction Layer
10 * Copyright 2007 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 <asm/blackfin.h>
88 #include <asm/portmux.h>
89 #include <linux/irq.h>
92 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
93 (struct gpio_port_t *) FIO_FLAG_D,
98 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
99 (struct gpio_port_t *) PORTFIO,
100 (struct gpio_port_t *) PORTGIO,
101 (struct gpio_port_t *) PORTHIO,
104 static unsigned short *port_fer[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
105 (unsigned short *) PORTF_FER,
106 (unsigned short *) PORTG_FER,
107 (unsigned short *) PORTH_FER,
113 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
114 (struct gpio_port_t *) FIO0_FLAG_D,
115 (struct gpio_port_t *) FIO1_FLAG_D,
116 (struct gpio_port_t *) FIO2_FLAG_D,
121 static struct gpio_port_t *gpio_array[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
122 (struct gpio_port_t *)PORTA_FER,
123 (struct gpio_port_t *)PORTB_FER,
124 (struct gpio_port_t *)PORTC_FER,
125 (struct gpio_port_t *)PORTD_FER,
126 (struct gpio_port_t *)PORTE_FER,
127 (struct gpio_port_t *)PORTF_FER,
128 (struct gpio_port_t *)PORTG_FER,
129 (struct gpio_port_t *)PORTH_FER,
130 (struct gpio_port_t *)PORTI_FER,
131 (struct gpio_port_t *)PORTJ_FER,
135 static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
136 static unsigned short reserved_peri_map[gpio_bank(MAX_BLACKFIN_GPIOS + 16)];
138 #define MAX_RESOURCES 256
139 #define RESOURCE_LABEL_SIZE 16
142 char name[RESOURCE_LABEL_SIZE];
147 static unsigned short wakeup_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
148 static unsigned char wakeup_flags_map[MAX_BLACKFIN_GPIOS];
149 static struct gpio_port_s gpio_bank_saved[gpio_bank(MAX_BLACKFIN_GPIOS)];
152 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB};
156 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX};
160 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB};
163 #endif /* CONFIG_PM */
165 #if defined(BF548_FAMILY)
166 inline int check_gpio(unsigned short gpio)
168 if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15
169 || gpio == GPIO_PH14 || gpio == GPIO_PH15
170 || gpio == GPIO_PJ14 || gpio == GPIO_PJ15
171 || gpio > MAX_BLACKFIN_GPIOS)
176 inline int check_gpio(unsigned short gpio)
178 if (gpio >= MAX_BLACKFIN_GPIOS)
184 static void set_label(unsigned short ident, const char *label)
187 if (label && str_ident) {
188 strncpy(str_ident[ident].name, label,
189 RESOURCE_LABEL_SIZE);
190 str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
194 static char *get_label(unsigned short ident)
199 return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN");
202 static int cmp_label(unsigned short ident, const char *label)
204 if (label && str_ident)
205 return strncmp(str_ident[ident].name,
206 label, strlen(label));
212 static void port_setup(unsigned short gpio, unsigned short usage)
214 if (!check_gpio(gpio)) {
215 if (usage == GPIO_USAGE)
216 *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
218 *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
222 #elif defined(BF548_FAMILY)
223 static void port_setup(unsigned short gpio, unsigned short usage)
225 if (usage == GPIO_USAGE)
226 gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
228 gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
232 # define port_setup(...) do { } while (0)
238 unsigned short offset;
240 {.res = P_PPI0_D13, .offset = 11},
241 {.res = P_PPI0_D14, .offset = 11},
242 {.res = P_PPI0_D15, .offset = 11},
243 {.res = P_SPORT1_TFS, .offset = 11},
244 {.res = P_SPORT1_TSCLK, .offset = 11},
245 {.res = P_SPORT1_DTPRI, .offset = 11},
246 {.res = P_PPI0_D10, .offset = 10},
247 {.res = P_PPI0_D11, .offset = 10},
248 {.res = P_PPI0_D12, .offset = 10},
249 {.res = P_SPORT1_RSCLK, .offset = 10},
250 {.res = P_SPORT1_RFS, .offset = 10},
251 {.res = P_SPORT1_DRPRI, .offset = 10},
252 {.res = P_PPI0_D8, .offset = 9},
253 {.res = P_PPI0_D9, .offset = 9},
254 {.res = P_SPORT1_DRSEC, .offset = 9},
255 {.res = P_SPORT1_DTSEC, .offset = 9},
256 {.res = P_TMR2, .offset = 8},
257 {.res = P_PPI0_FS3, .offset = 8},
258 {.res = P_TMR3, .offset = 7},
259 {.res = P_SPI0_SSEL4, .offset = 7},
260 {.res = P_TMR4, .offset = 6},
261 {.res = P_SPI0_SSEL5, .offset = 6},
262 {.res = P_TMR5, .offset = 5},
263 {.res = P_SPI0_SSEL6, .offset = 5},
264 {.res = P_UART1_RX, .offset = 4},
265 {.res = P_UART1_TX, .offset = 4},
266 {.res = P_TMR6, .offset = 4},
267 {.res = P_TMR7, .offset = 4},
268 {.res = P_UART0_RX, .offset = 3},
269 {.res = P_UART0_TX, .offset = 3},
270 {.res = P_DMAR0, .offset = 3},
271 {.res = P_DMAR1, .offset = 3},
272 {.res = P_SPORT0_DTSEC, .offset = 1},
273 {.res = P_SPORT0_DRSEC, .offset = 1},
274 {.res = P_CAN0_RX, .offset = 1},
275 {.res = P_CAN0_TX, .offset = 1},
276 {.res = P_SPI0_SSEL7, .offset = 1},
277 {.res = P_SPORT0_TFS, .offset = 0},
278 {.res = P_SPORT0_DTPRI, .offset = 0},
279 {.res = P_SPI0_SSEL2, .offset = 0},
280 {.res = P_SPI0_SSEL3, .offset = 0},
283 static void portmux_setup(unsigned short per, unsigned short function)
285 u16 y, offset, muxreg;
287 for (y = 0; y < ARRAY_SIZE(port_mux_lut); y++) {
288 if (port_mux_lut[y].res == per) {
290 /* SET PORTMUX REG */
292 offset = port_mux_lut[y].offset;
293 muxreg = bfin_read_PORT_MUX();
296 muxreg &= ~(1 << offset);
301 muxreg |= (function << offset);
302 bfin_write_PORT_MUX(muxreg);
306 #elif defined(BF548_FAMILY)
307 inline void portmux_setup(unsigned short portno, unsigned short function)
311 pmux = gpio_array[gpio_bank(portno)]->port_mux;
313 pmux &= ~(0x3 << (2 * gpio_sub_n(portno)));
314 pmux |= (function & 0x3) << (2 * gpio_sub_n(portno));
316 gpio_array[gpio_bank(portno)]->port_mux = pmux;
319 inline u16 get_portmux(unsigned short portno)
323 pmux = gpio_array[gpio_bank(portno)]->port_mux;
325 return (pmux >> (2 * gpio_sub_n(portno)) & 0x3);
328 # define portmux_setup(...) do { } while (0)
332 static void default_gpio(unsigned short gpio)
334 unsigned short bank, bitmask;
336 bank = gpio_bank(gpio);
337 bitmask = gpio_bit(gpio);
339 gpio_bankb[bank]->maska_clear = bitmask;
340 gpio_bankb[bank]->maskb_clear = bitmask;
342 gpio_bankb[bank]->inen &= ~bitmask;
343 gpio_bankb[bank]->dir &= ~bitmask;
344 gpio_bankb[bank]->polar &= ~bitmask;
345 gpio_bankb[bank]->both &= ~bitmask;
346 gpio_bankb[bank]->edge &= ~bitmask;
349 # define default_gpio(...) do { } while (0)
352 static int __init bfin_gpio_init(void)
354 str_ident = kcalloc(MAX_RESOURCES,
355 sizeof(struct str_ident), GFP_KERNEL);
356 if (str_ident == NULL)
359 memset(str_ident, 0, MAX_RESOURCES * sizeof(struct str_ident));
361 printk(KERN_INFO "Blackfin GPIO Controller\n");
366 arch_initcall(bfin_gpio_init);
370 /***********************************************************
372 * FUNCTIONS: Blackfin General Purpose Ports Access Functions
375 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
378 * DESCRIPTION: These functions abstract direct register access
379 * to Blackfin processor General Purpose
382 * CAUTION: These functions do not belong to the GPIO Driver API
383 *************************************************************
384 * MODIFICATION HISTORY :
385 **************************************************************/
387 /* Set a specific bit */
389 #define SET_GPIO(name) \
390 void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
392 unsigned long flags; \
393 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
394 local_irq_save(flags); \
396 gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
398 gpio_bankb[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
399 local_irq_restore(flags); \
401 EXPORT_SYMBOL(set_gpio_ ## name);
410 #define SET_GPIO_SC(name) \
411 void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
413 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
415 gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
417 gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
419 EXPORT_SYMBOL(set_gpio_ ## name);
425 void set_gpio_data(unsigned short gpio, unsigned short arg)
428 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
429 local_irq_save(flags);
431 gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
433 gpio_bankb[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
435 local_irq_restore(flags);
437 EXPORT_SYMBOL(set_gpio_data);
444 void set_gpio_toggle(unsigned short gpio)
447 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
448 local_irq_save(flags);
449 gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
451 local_irq_restore(flags);
454 void set_gpio_toggle(unsigned short gpio)
456 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
457 gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
460 EXPORT_SYMBOL(set_gpio_toggle);
463 /*Set current PORT date (16-bit word)*/
465 #define SET_GPIO_P(name) \
466 void set_gpiop_ ## name(unsigned short gpio, unsigned short arg) \
468 gpio_bankb[gpio_bank(gpio)]->name = arg; \
470 EXPORT_SYMBOL(set_gpiop_ ## name);
482 void set_gpiop_data(unsigned short gpio, unsigned short arg)
485 local_irq_save(flags);
486 gpio_bankb[gpio_bank(gpio)]->data = arg;
488 local_irq_restore(flags);
490 EXPORT_SYMBOL(set_gpiop_data);
497 /* Get a specific bit */
499 #define GET_GPIO(name) \
500 unsigned short get_gpio_ ## name(unsigned short gpio) \
502 return (0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio))); \
504 EXPORT_SYMBOL(get_gpio_ ## name);
516 unsigned short get_gpio_data(unsigned short gpio)
520 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
521 local_irq_save(flags);
522 ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->data >> gpio_sub_n(gpio));
524 local_irq_restore(flags);
527 EXPORT_SYMBOL(get_gpio_data);
532 /*Get current PORT date (16-bit word)*/
534 #define GET_GPIO_P(name) \
535 unsigned short get_gpiop_ ## name(unsigned short gpio) \
537 return (gpio_bankb[gpio_bank(gpio)]->name);\
539 EXPORT_SYMBOL(get_gpiop_ ## name);
550 unsigned short get_gpiop_data(unsigned short gpio)
554 local_irq_save(flags);
555 ret = gpio_bankb[gpio_bank(gpio)]->data;
557 local_irq_restore(flags);
560 EXPORT_SYMBOL(get_gpiop_data);
566 /***********************************************************
568 * FUNCTIONS: Blackfin PM Setup API
571 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
579 * DESCRIPTION: Blackfin PM Driver API
582 *************************************************************
583 * MODIFICATION HISTORY :
584 **************************************************************/
585 int gpio_pm_wakeup_request(unsigned short gpio, unsigned char type)
589 if ((check_gpio(gpio) < 0) || !type)
592 local_irq_save(flags);
594 wakeup_map[gpio_bank(gpio)] |= gpio_bit(gpio);
595 wakeup_flags_map[gpio] = type;
596 local_irq_restore(flags);
600 EXPORT_SYMBOL(gpio_pm_wakeup_request);
602 void gpio_pm_wakeup_free(unsigned short gpio)
606 if (check_gpio(gpio) < 0)
609 local_irq_save(flags);
611 wakeup_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
613 local_irq_restore(flags);
615 EXPORT_SYMBOL(gpio_pm_wakeup_free);
617 static int bfin_gpio_wakeup_type(unsigned short gpio, unsigned char type)
619 port_setup(gpio, GPIO_USAGE);
620 set_gpio_dir(gpio, 0);
621 set_gpio_inen(gpio, 1);
623 if (type & (PM_WAKE_RISING | PM_WAKE_FALLING))
624 set_gpio_edge(gpio, 1);
626 set_gpio_edge(gpio, 0);
628 if ((type & (PM_WAKE_BOTH_EDGES)) == (PM_WAKE_BOTH_EDGES))
629 set_gpio_both(gpio, 1);
631 set_gpio_both(gpio, 0);
633 if ((type & (PM_WAKE_FALLING | PM_WAKE_LOW)))
634 set_gpio_polar(gpio, 1);
636 set_gpio_polar(gpio, 0);
643 u32 gpio_pm_setup(void)
646 u16 bank, mask, i, gpio;
648 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
649 mask = wakeup_map[gpio_bank(i)];
652 gpio_bank_saved[bank].maskb = gpio_bankb[bank]->maskb;
653 gpio_bankb[bank]->maskb = 0;
657 gpio_bank_saved[bank].fer = *port_fer[bank];
659 gpio_bank_saved[bank].inen = gpio_bankb[bank]->inen;
660 gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar;
661 gpio_bank_saved[bank].dir = gpio_bankb[bank]->dir;
662 gpio_bank_saved[bank].edge = gpio_bankb[bank]->edge;
663 gpio_bank_saved[bank].both = gpio_bankb[bank]->both;
664 gpio_bank_saved[bank].reserved =
665 reserved_gpio_map[bank];
671 reserved_gpio_map[gpio_bank(gpio)] |=
673 bfin_gpio_wakeup_type(gpio,
674 wakeup_flags_map[gpio]);
675 set_gpio_data(gpio, 0); /*Clear*/
682 (sic_iwr_irqs[bank] - (IRQ_CORETMR + 1));
683 gpio_bankb[bank]->maskb_set = wakeup_map[gpio_bank(i)];
690 return IWR_ENABLE_ALL;
693 void gpio_pm_restore(void)
697 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
698 mask = wakeup_map[gpio_bank(i)];
703 *port_fer[bank] = gpio_bank_saved[bank].fer;
705 gpio_bankb[bank]->inen = gpio_bank_saved[bank].inen;
706 gpio_bankb[bank]->dir = gpio_bank_saved[bank].dir;
707 gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar;
708 gpio_bankb[bank]->edge = gpio_bank_saved[bank].edge;
709 gpio_bankb[bank]->both = gpio_bank_saved[bank].both;
711 reserved_gpio_map[bank] =
712 gpio_bank_saved[bank].reserved;
716 gpio_bankb[bank]->maskb = gpio_bank_saved[bank].maskb;
721 #endif /* BF548_FAMILY */
723 /***********************************************************
725 * FUNCTIONS: Blackfin Peripheral Resource Allocation
729 * per Peripheral Identifier
732 * DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API
735 *************************************************************
736 * MODIFICATION HISTORY :
737 **************************************************************/
740 int peripheral_request(unsigned short per, const char *label)
743 unsigned short ident = P_IDENT(per);
746 * Don't cares are pins with only one dedicated function
749 if (per & P_DONTCARE)
752 if (!(per & P_DEFINED))
755 if (check_gpio(ident) < 0)
758 local_irq_save(flags);
760 if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
762 "%s: Peripheral %d is already reserved as GPIO by %s !\n",
763 __FUNCTION__, ident, get_label(ident));
765 local_irq_restore(flags);
769 if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
771 u16 funct = get_portmux(ident);
774 * Pin functions like AMC address strobes my
775 * be requested and used by several drivers
778 if (!((per & P_MAYSHARE) && (funct == P_FUNCT2MUX(per)))) {
781 * Allow that the identical pin function can
782 * be requested from the same driver twice
785 if (cmp_label(ident, label) == 0)
789 "%s: Peripheral %d function %d is already reserved by %s !\n",
790 __FUNCTION__, ident, P_FUNCT2MUX(per), get_label(ident));
792 local_irq_restore(flags);
798 reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
800 portmux_setup(ident, P_FUNCT2MUX(per));
801 port_setup(ident, PERIPHERAL_USAGE);
803 local_irq_restore(flags);
804 set_label(ident, label);
808 EXPORT_SYMBOL(peripheral_request);
811 int peripheral_request(unsigned short per, const char *label)
814 unsigned short ident = P_IDENT(per);
817 * Don't cares are pins with only one dedicated function
820 if (per & P_DONTCARE)
823 if (!(per & P_DEFINED))
826 local_irq_save(flags);
828 if (!check_gpio(ident)) {
830 if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
832 "%s: Peripheral %d is already reserved as GPIO by %s !\n",
833 __FUNCTION__, ident, get_label(ident));
835 local_irq_restore(flags);
841 if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
844 * Pin functions like AMC address strobes my
845 * be requested and used by several drivers
848 if (!(per & P_MAYSHARE)) {
851 * Allow that the identical pin function can
852 * be requested from the same driver twice
855 if (cmp_label(ident, label) == 0)
859 "%s: Peripheral %d function %d is already"
860 " reserved by %s !\n",
861 __FUNCTION__, ident, P_FUNCT2MUX(per),
864 local_irq_restore(flags);
871 portmux_setup(per, P_FUNCT2MUX(per));
873 port_setup(ident, PERIPHERAL_USAGE);
875 reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
876 local_irq_restore(flags);
877 set_label(ident, label);
881 EXPORT_SYMBOL(peripheral_request);
884 int peripheral_request_list(unsigned short per[], const char *label)
889 for (cnt = 0; per[cnt] != 0; cnt++) {
891 ret = peripheral_request(per[cnt], label);
894 for ( ; cnt > 0; cnt--) {
895 peripheral_free(per[cnt - 1]);
903 EXPORT_SYMBOL(peripheral_request_list);
905 void peripheral_free(unsigned short per)
908 unsigned short ident = P_IDENT(per);
910 if (per & P_DONTCARE)
913 if (!(per & P_DEFINED))
916 if (check_gpio(ident) < 0)
919 local_irq_save(flags);
921 if (unlikely(!(reserved_peri_map[gpio_bank(ident)]
922 & gpio_bit(ident)))) {
923 local_irq_restore(flags);
927 if (!(per & P_MAYSHARE)) {
928 port_setup(ident, GPIO_USAGE);
931 reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);
933 local_irq_restore(flags);
935 EXPORT_SYMBOL(peripheral_free);
937 void peripheral_free_list(unsigned short per[])
941 for (cnt = 0; per[cnt] != 0; cnt++) {
942 peripheral_free(per[cnt]);
946 EXPORT_SYMBOL(peripheral_free_list);
948 /***********************************************************
950 * FUNCTIONS: Blackfin GPIO Driver
953 * gpio PIO Number between 0 and MAX_BLACKFIN_GPIOS
956 * DESCRIPTION: Blackfin GPIO Driver API
959 *************************************************************
960 * MODIFICATION HISTORY :
961 **************************************************************/
963 int gpio_request(unsigned short gpio, const char *label)
967 if (check_gpio(gpio) < 0)
970 local_irq_save(flags);
972 if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
973 printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
974 gpio, get_label(gpio));
976 local_irq_restore(flags);
979 if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
981 "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
982 gpio, get_label(gpio));
984 local_irq_restore(flags);
988 reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
990 local_irq_restore(flags);
992 port_setup(gpio, GPIO_USAGE);
993 set_label(gpio, label);
997 EXPORT_SYMBOL(gpio_request);
999 void gpio_free(unsigned short gpio)
1001 unsigned long flags;
1003 if (check_gpio(gpio) < 0)
1006 local_irq_save(flags);
1008 if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
1009 printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
1011 local_irq_restore(flags);
1017 reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
1019 local_irq_restore(flags);
1021 EXPORT_SYMBOL(gpio_free);
1024 void gpio_direction_input(unsigned short gpio)
1026 unsigned long flags;
1028 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
1030 local_irq_save(flags);
1031 gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
1032 gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
1033 local_irq_restore(flags);
1035 EXPORT_SYMBOL(gpio_direction_input);
1037 void gpio_direction_output(unsigned short gpio)
1039 unsigned long flags;
1041 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
1043 local_irq_save(flags);
1044 gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio);
1045 gpio_array[gpio_bank(gpio)]->port_dir_set = gpio_bit(gpio);
1046 local_irq_restore(flags);
1048 EXPORT_SYMBOL(gpio_direction_output);
1050 void gpio_set_value(unsigned short gpio, unsigned short arg)
1053 gpio_array[gpio_bank(gpio)]->port_set = gpio_bit(gpio);
1055 gpio_array[gpio_bank(gpio)]->port_clear = gpio_bit(gpio);
1058 EXPORT_SYMBOL(gpio_set_value);
1060 unsigned short gpio_get_value(unsigned short gpio)
1062 return (1 & (gpio_array[gpio_bank(gpio)]->port_data >> gpio_sub_n(gpio)));
1064 EXPORT_SYMBOL(gpio_get_value);
1068 void gpio_direction_input(unsigned short gpio)
1070 unsigned long flags;
1072 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
1074 local_irq_save(flags);
1075 gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
1076 gpio_bankb[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
1077 local_irq_restore(flags);
1079 EXPORT_SYMBOL(gpio_direction_input);
1081 void gpio_direction_output(unsigned short gpio)
1083 unsigned long flags;
1085 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
1087 local_irq_save(flags);
1088 gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
1089 gpio_bankb[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
1090 local_irq_restore(flags);
1092 EXPORT_SYMBOL(gpio_direction_output);
1094 /* If we are booting from SPI and our board lacks a strong enough pull up,
1095 * the core can reset and execute the bootrom faster than the resistor can
1096 * pull the signal logically high. To work around this (common) error in
1097 * board design, we explicitly set the pin back to GPIO mode, force /CS
1098 * high, and wait for the electrons to do their thing.
1100 * This function only makes sense to be called from reset code, but it
1101 * lives here as we need to force all the GPIO states w/out going through
1102 * BUG() checks and such.
1104 void bfin_gpio_reset_spi0_ssel1(void)
1106 u16 gpio = P_IDENT(P_SPI0_SSEL1);
1108 port_setup(gpio, GPIO_USAGE);
1109 gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
1113 #endif /*BF548_FAMILY */