2 * File: arch/blackfin/kernel/bfin_gpio.c
4 * Author: Michael Hennerich (hennerich@blackfin.uclinux.org)
7 * Description: GPIO Abstraction Layer
10 * Copyright 2006 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
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/module.h>
84 #include <linux/err.h>
85 #include <asm/blackfin.h>
87 #include <asm/portmux.h>
88 #include <linux/irq.h>
91 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
92 (struct gpio_port_t *) FIO_FLAG_D,
97 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
98 (struct gpio_port_t *) PORTFIO,
99 (struct gpio_port_t *) PORTGIO,
100 (struct gpio_port_t *) PORTHIO,
103 static unsigned short *port_fer[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
104 (unsigned short *) PORTF_FER,
105 (unsigned short *) PORTG_FER,
106 (unsigned short *) PORTH_FER,
112 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
113 (struct gpio_port_t *) FIO0_FLAG_D,
114 (struct gpio_port_t *) FIO1_FLAG_D,
115 (struct gpio_port_t *) FIO2_FLAG_D,
119 static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
120 static unsigned short reserved_peri_map[gpio_bank(MAX_BLACKFIN_GPIOS + 16)];
121 char *str_ident = NULL;
123 #define RESOURCE_LABEL_SIZE 16
126 static unsigned short wakeup_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
127 static unsigned char wakeup_flags_map[MAX_BLACKFIN_GPIOS];
128 static struct gpio_port_s gpio_bank_saved[gpio_bank(MAX_BLACKFIN_GPIOS)];
131 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB};
135 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX};
139 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB};
142 #endif /* CONFIG_PM */
144 inline int check_gpio(unsigned short gpio)
146 if (gpio >= MAX_BLACKFIN_GPIOS)
151 static void set_label(unsigned short ident, const char *label)
154 if (label && str_ident) {
155 strncpy(str_ident + ident * RESOURCE_LABEL_SIZE, label,
156 RESOURCE_LABEL_SIZE);
157 str_ident[ident * RESOURCE_LABEL_SIZE +
158 RESOURCE_LABEL_SIZE - 1] = 0;
162 static char *get_label(unsigned short ident)
167 return (str_ident[ident * RESOURCE_LABEL_SIZE] ?
168 (str_ident + ident * RESOURCE_LABEL_SIZE) : "UNKNOWN");
171 static int cmp_label(unsigned short ident, const char *label)
173 if (label && str_ident)
174 return strncmp(str_ident + ident * RESOURCE_LABEL_SIZE,
175 label, strlen(label));
181 static void port_setup(unsigned short gpio, unsigned short usage)
183 if (usage == GPIO_USAGE) {
184 *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
186 *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
190 # define port_setup(...) do { } while (0)
195 #define PMUX_LUT_RES 0
196 #define PMUX_LUT_OFFSET 1
197 #define PMUX_LUT_ENTRIES 41
198 #define PMUX_LUT_SIZE 2
200 static unsigned short port_mux_lut[PMUX_LUT_ENTRIES][PMUX_LUT_SIZE] = {
201 {P_PPI0_D13, 11}, {P_PPI0_D14, 11}, {P_PPI0_D15, 11},
202 {P_SPORT1_TFS, 11}, {P_SPORT1_TSCLK, 11}, {P_SPORT1_DTPRI, 11},
203 {P_PPI0_D10, 10}, {P_PPI0_D11, 10}, {P_PPI0_D12, 10},
204 {P_SPORT1_RSCLK, 10}, {P_SPORT1_RFS, 10}, {P_SPORT1_DRPRI, 10},
205 {P_PPI0_D8, 9}, {P_PPI0_D9, 9}, {P_SPORT1_DRSEC, 9},
206 {P_SPORT1_DTSEC, 9}, {P_TMR2, 8}, {P_PPI0_FS3, 8}, {P_TMR3, 7},
207 {P_SPI0_SSEL4, 7}, {P_TMR4, 6}, {P_SPI0_SSEL5, 6}, {P_TMR5, 5},
208 {P_SPI0_SSEL6, 5}, {P_UART1_RX, 4}, {P_UART1_TX, 4}, {P_TMR6, 4},
209 {P_TMR7, 4}, {P_UART0_RX, 3}, {P_UART0_TX, 3}, {P_DMAR0, 3},
210 {P_DMAR1, 3}, {P_SPORT0_DTSEC, 1}, {P_SPORT0_DRSEC, 1},
211 {P_CAN0_RX, 1}, {P_CAN0_TX, 1}, {P_SPI0_SSEL7, 1},
212 {P_SPORT0_TFS, 0}, {P_SPORT0_DTPRI, 0}, {P_SPI0_SSEL2, 0},
216 static void portmux_setup(unsigned short per, unsigned short function)
218 u16 y, muxreg, offset;
220 for (y = 0; y < PMUX_LUT_ENTRIES; y++) {
221 if (port_mux_lut[y][PMUX_LUT_RES] == per) {
223 /* SET PORTMUX REG */
225 offset = port_mux_lut[y][PMUX_LUT_OFFSET];
226 muxreg = bfin_read_PORT_MUX();
229 muxreg &= ~(1 << offset);
234 muxreg |= (function << offset);
235 bfin_write_PORT_MUX(muxreg);
241 # define portmux_setup(...) do { } while (0)
244 static void default_gpio(unsigned short gpio)
246 unsigned short bank, bitmask;
248 bank = gpio_bank(gpio);
249 bitmask = gpio_bit(gpio);
251 gpio_bankb[bank]->maska_clear = bitmask;
252 gpio_bankb[bank]->maskb_clear = bitmask;
254 gpio_bankb[bank]->inen &= ~bitmask;
255 gpio_bankb[bank]->dir &= ~bitmask;
256 gpio_bankb[bank]->polar &= ~bitmask;
257 gpio_bankb[bank]->both &= ~bitmask;
258 gpio_bankb[bank]->edge &= ~bitmask;
261 static int __init bfin_gpio_init(void)
264 str_ident = kzalloc(RESOURCE_LABEL_SIZE * 256, GFP_KERNEL);
268 printk(KERN_INFO "Blackfin GPIO Controller\n");
274 arch_initcall(bfin_gpio_init);
277 /***********************************************************
279 * FUNCTIONS: Blackfin General Purpose Ports Access Functions
282 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
285 * DESCRIPTION: These functions abstract direct register access
286 * to Blackfin processor General Purpose
289 * CAUTION: These functions do not belong to the GPIO Driver API
290 *************************************************************
291 * MODIFICATION HISTORY :
292 **************************************************************/
294 /* Set a specific bit */
296 #define SET_GPIO(name) \
297 void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
299 unsigned long flags; \
300 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
301 local_irq_save(flags); \
303 gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
305 gpio_bankb[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
306 local_irq_restore(flags); \
308 EXPORT_SYMBOL(set_gpio_ ## name);
317 #define SET_GPIO_SC(name) \
318 void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
320 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
322 gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
324 gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
326 EXPORT_SYMBOL(set_gpio_ ## name);
331 #if defined(ANOMALY_05000311)
332 void set_gpio_data(unsigned short gpio, unsigned short arg)
335 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
336 local_irq_save(flags);
338 gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
340 gpio_bankb[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
342 local_irq_restore(flags);
344 EXPORT_SYMBOL(set_gpio_data);
350 #if defined(ANOMALY_05000311)
351 void set_gpio_toggle(unsigned short gpio)
354 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
355 local_irq_save(flags);
356 gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
358 local_irq_restore(flags);
361 void set_gpio_toggle(unsigned short gpio)
363 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
364 gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
367 EXPORT_SYMBOL(set_gpio_toggle);
370 /*Set current PORT date (16-bit word)*/
372 #define SET_GPIO_P(name) \
373 void set_gpiop_ ## name(unsigned short gpio, unsigned short arg) \
375 gpio_bankb[gpio_bank(gpio)]->name = arg; \
377 EXPORT_SYMBOL(set_gpiop_ ## name);
388 #if defined(ANOMALY_05000311)
389 void set_gpiop_data(unsigned short gpio, unsigned short arg)
392 local_irq_save(flags);
393 gpio_bankb[gpio_bank(gpio)]->data = arg;
395 local_irq_restore(flags);
397 EXPORT_SYMBOL(set_gpiop_data);
404 /* Get a specific bit */
406 #define GET_GPIO(name) \
407 unsigned short get_gpio_ ## name(unsigned short gpio) \
409 return (0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio))); \
411 EXPORT_SYMBOL(get_gpio_ ## name);
422 #if defined(ANOMALY_05000311)
423 unsigned short get_gpio_data(unsigned short gpio)
427 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
428 local_irq_save(flags);
429 ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->data >> gpio_sub_n(gpio));
431 local_irq_restore(flags);
434 EXPORT_SYMBOL(get_gpio_data);
439 /*Get current PORT date (16-bit word)*/
441 #define GET_GPIO_P(name) \
442 unsigned short get_gpiop_ ## name(unsigned short gpio) \
444 return (gpio_bankb[gpio_bank(gpio)]->name);\
446 EXPORT_SYMBOL(get_gpiop_ ## name);
456 #if defined(ANOMALY_05000311)
457 unsigned short get_gpiop_data(unsigned short gpio)
461 local_irq_save(flags);
462 ret = gpio_bankb[gpio_bank(gpio)]->data;
464 local_irq_restore(flags);
467 EXPORT_SYMBOL(get_gpiop_data);
473 /***********************************************************
475 * FUNCTIONS: Blackfin PM Setup API
478 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
486 * DESCRIPTION: Blackfin PM Driver API
489 *************************************************************
490 * MODIFICATION HISTORY :
491 **************************************************************/
492 int gpio_pm_wakeup_request(unsigned short gpio, unsigned char type)
496 if ((check_gpio(gpio) < 0) || !type)
499 local_irq_save(flags);
501 wakeup_map[gpio_bank(gpio)] |= gpio_bit(gpio);
502 wakeup_flags_map[gpio] = type;
503 local_irq_restore(flags);
507 EXPORT_SYMBOL(gpio_pm_wakeup_request);
509 void gpio_pm_wakeup_free(unsigned short gpio)
513 if (check_gpio(gpio) < 0)
516 local_irq_save(flags);
518 wakeup_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
520 local_irq_restore(flags);
522 EXPORT_SYMBOL(gpio_pm_wakeup_free);
524 static int bfin_gpio_wakeup_type(unsigned short gpio, unsigned char type)
526 port_setup(gpio, GPIO_USAGE);
527 set_gpio_dir(gpio, 0);
528 set_gpio_inen(gpio, 1);
530 if (type & (PM_WAKE_RISING | PM_WAKE_FALLING))
531 set_gpio_edge(gpio, 1);
533 set_gpio_edge(gpio, 0);
535 if ((type & (PM_WAKE_BOTH_EDGES)) == (PM_WAKE_BOTH_EDGES))
536 set_gpio_both(gpio, 1);
538 set_gpio_both(gpio, 0);
540 if ((type & (PM_WAKE_FALLING | PM_WAKE_LOW)))
541 set_gpio_polar(gpio, 1);
543 set_gpio_polar(gpio, 0);
550 u32 gpio_pm_setup(void)
553 u16 bank, mask, i, gpio;
555 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
556 mask = wakeup_map[gpio_bank(i)];
559 gpio_bank_saved[bank].maskb = gpio_bankb[bank]->maskb;
560 gpio_bankb[bank]->maskb = 0;
564 gpio_bank_saved[bank].fer = *port_fer[bank];
566 gpio_bank_saved[bank].inen = gpio_bankb[bank]->inen;
567 gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar;
568 gpio_bank_saved[bank].dir = gpio_bankb[bank]->dir;
569 gpio_bank_saved[bank].edge = gpio_bankb[bank]->edge;
570 gpio_bank_saved[bank].both = gpio_bankb[bank]->both;
571 gpio_bank_saved[bank].reserved =
572 reserved_gpio_map[bank];
578 reserved_gpio_map[gpio_bank(gpio)] |=
580 bfin_gpio_wakeup_type(gpio,
581 wakeup_flags_map[gpio]);
582 set_gpio_data(gpio, 0); /*Clear*/
589 (sic_iwr_irqs[bank] - (IRQ_CORETMR + 1));
590 gpio_bankb[bank]->maskb_set = wakeup_map[gpio_bank(i)];
597 return IWR_ENABLE_ALL;
600 void gpio_pm_restore(void)
604 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
605 mask = wakeup_map[gpio_bank(i)];
610 *port_fer[bank] = gpio_bank_saved[bank].fer;
612 gpio_bankb[bank]->inen = gpio_bank_saved[bank].inen;
613 gpio_bankb[bank]->dir = gpio_bank_saved[bank].dir;
614 gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar;
615 gpio_bankb[bank]->edge = gpio_bank_saved[bank].edge;
616 gpio_bankb[bank]->both = gpio_bank_saved[bank].both;
618 reserved_gpio_map[bank] =
619 gpio_bank_saved[bank].reserved;
623 gpio_bankb[bank]->maskb = gpio_bank_saved[bank].maskb;
632 int peripheral_request(unsigned short per, const char *label)
635 unsigned short ident = P_IDENT(per);
638 * Don't cares are pins with only one dedicated function
641 if (per & P_DONTCARE)
644 if (!(per & P_DEFINED))
647 if (check_gpio(ident) < 0)
650 local_irq_save(flags);
652 if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
654 "%s: Peripheral %d is already reserved as GPIO by %s !\n",
655 __FUNCTION__, ident, get_label(ident));
657 local_irq_restore(flags);
661 if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
664 * Pin functions like AMC address strobes my
665 * be requested and used by several drivers
668 if (!(per & P_MAYSHARE)) {
671 * Allow that the identical pin function can
672 * be requested from the same driver twice
675 if (cmp_label(ident, label) == 0)
679 "%s: Peripheral %d function %d is already"
680 "reserved by %s !\n",
681 __FUNCTION__, ident, P_FUNCT2MUX(per),
684 local_irq_restore(flags);
693 portmux_setup(per, P_FUNCT2MUX(per));
695 port_setup(ident, PERIPHERAL_USAGE);
697 reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
698 local_irq_restore(flags);
699 set_label(ident, label);
703 EXPORT_SYMBOL(peripheral_request);
705 int peripheral_request_list(unsigned short per[], const char *label)
710 for (cnt = 0; per[cnt] != 0; cnt++) {
711 ret = peripheral_request(per[cnt], label);
718 EXPORT_SYMBOL(peripheral_request_list);
720 void peripheral_free(unsigned short per)
723 unsigned short ident = P_IDENT(per);
725 if (per & P_DONTCARE)
728 if (!(per & P_DEFINED))
731 if (check_gpio(ident) < 0)
734 local_irq_save(flags);
736 if (unlikely(!(reserved_peri_map[gpio_bank(ident)]
737 & gpio_bit(ident)))) {
738 local_irq_restore(flags);
742 if (!(per & P_MAYSHARE)) {
743 port_setup(ident, GPIO_USAGE);
746 reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);
748 local_irq_restore(flags);
750 EXPORT_SYMBOL(peripheral_free);
752 void peripheral_free_list(unsigned short per[])
756 for (cnt = 0; per[cnt] != 0; cnt++) {
757 peripheral_free(per[cnt]);
761 EXPORT_SYMBOL(peripheral_free_list);
763 /***********************************************************
765 * FUNCTIONS: Blackfin GPIO Driver
768 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
771 * DESCRIPTION: Blackfin GPIO Driver API
774 *************************************************************
775 * MODIFICATION HISTORY :
776 **************************************************************/
778 int gpio_request(unsigned short gpio, const char *label)
782 if (check_gpio(gpio) < 0)
785 local_irq_save(flags);
787 if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
788 printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio);
790 local_irq_restore(flags);
793 reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
795 local_irq_restore(flags);
797 port_setup(gpio, GPIO_USAGE);
801 EXPORT_SYMBOL(gpio_request);
803 void gpio_free(unsigned short gpio)
807 if (check_gpio(gpio) < 0)
810 local_irq_save(flags);
812 if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
813 printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
815 local_irq_restore(flags);
821 reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
823 local_irq_restore(flags);
825 EXPORT_SYMBOL(gpio_free);
827 void gpio_direction_input(unsigned short gpio)
831 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
833 local_irq_save(flags);
834 gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
835 gpio_bankb[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
836 local_irq_restore(flags);
838 EXPORT_SYMBOL(gpio_direction_input);
840 void gpio_direction_output(unsigned short gpio)
844 BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
846 local_irq_save(flags);
847 gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
848 gpio_bankb[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
849 local_irq_restore(flags);
851 EXPORT_SYMBOL(gpio_direction_output);