1f83b8f148
Signed-off-by: Mike Frysinger <michael.frysinger@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
175 lines
4.5 KiB
C
175 lines
4.5 KiB
C
/*
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* File: arch/blackfin/mach-bf548/gpio.c
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* Based on:
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* Author: Michael Hennerich (hennerich@blackfin.uclinux.org)
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*
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* Created:
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* Description: GPIO Abstraction Layer
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*
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* Modified:
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* Copyright 2007 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <asm/blackfin.h>
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#include <asm/gpio.h>
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#include <linux/irq.h>
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static struct gpio_port_t *gpio_array[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
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(struct gpio_port_t *) PORTA_FER,
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(struct gpio_port_t *) PORTB_FER,
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(struct gpio_port_t *) PORTC_FER,
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(struct gpio_port_t *) PORTD_FER,
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(struct gpio_port_t *) PORTE_FER,
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(struct gpio_port_t *) PORTF_FER,
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(struct gpio_port_t *) PORTG_FER,
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(struct gpio_port_t *) PORTH_FER,
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(struct gpio_port_t *) PORTI_FER,
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(struct gpio_port_t *) PORTJ_FER,
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};
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static unsigned short reserved_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
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inline int check_gpio(unsigned short gpio)
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{
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if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15 \
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|| gpio == GPIO_PH14 || gpio == GPIO_PH15 \
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|| gpio > MAX_BLACKFIN_GPIOS)
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return -EINVAL;
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return 0;
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}
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static void port_setup(unsigned short gpio, unsigned short usage)
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{
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if (usage == GPIO_USAGE) {
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if (gpio_array[gpio_bank(gpio)]->port_fer & gpio_bit(gpio))
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printk(KERN_WARNING "bfin-gpio: Possible Conflict with Peripheral "
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"usage and GPIO %d detected!\n", gpio);
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gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
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} else
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gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
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SSYNC();
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}
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static int __init bfin_gpio_init(void)
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{
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int i;
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printk(KERN_INFO "Blackfin GPIO Controller\n");
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for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE)
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reserved_map[gpio_bank(i)] = 0;
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return 0;
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}
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arch_initcall(bfin_gpio_init);
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/***********************************************************
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*
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* FUNCTIONS: Blackfin GPIO Driver
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*
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* INPUTS/OUTPUTS:
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* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
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*
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*
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* DESCRIPTION: Blackfin GPIO Driver API
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*
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* CAUTION:
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*************************************************************
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* MODIFICATION HISTORY :
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**************************************************************/
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int gpio_request(unsigned short gpio, const char *label)
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{
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unsigned long flags;
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if (check_gpio(gpio) < 0)
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return -EINVAL;
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local_irq_save(flags);
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if (unlikely(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
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printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio);
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dump_stack();
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local_irq_restore(flags);
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return -EBUSY;
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}
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reserved_map[gpio_bank(gpio)] |= gpio_bit(gpio);
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local_irq_restore(flags);
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port_setup(gpio, GPIO_USAGE);
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return 0;
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}
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EXPORT_SYMBOL(gpio_request);
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void gpio_free(unsigned short gpio)
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{
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unsigned long flags;
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if (check_gpio(gpio) < 0)
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return;
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local_irq_save(flags);
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if (unlikely(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
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printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
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dump_stack();
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local_irq_restore(flags);
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return;
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}
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reserved_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(gpio_free);
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void gpio_direction_input(unsigned short gpio)
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{
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unsigned long flags;
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BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
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local_irq_save(flags);
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gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
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gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(gpio_direction_input);
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void gpio_direction_output(unsigned short gpio)
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{
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unsigned long flags;
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BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
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local_irq_save(flags);
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gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio);
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gpio_array[gpio_bank(gpio)]->port_dir_set = gpio_bit(gpio);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(gpio_direction_output);
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