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Diffstat (limited to 'arch/blackfin/mach-bf548/gpio.c')
-rw-r--r--arch/blackfin/mach-bf548/gpio.c323
1 files changed, 323 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf548/gpio.c b/arch/blackfin/mach-bf548/gpio.c
new file mode 100644
index 000000000000..0da5f0003b8c
--- /dev/null
+++ b/arch/blackfin/mach-bf548/gpio.c
@@ -0,0 +1,323 @@
+/*
+ * File: arch/blackfin/mach-bf548/gpio.c
+ * Based on:
+ * Author: Michael Hennerich (hennerich@blackfin.uclinux.org)
+ *
+ * Created:
+ * Description: GPIO Abstraction Layer
+ *
+ * Modified:
+ * Copyright 2007 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <asm/blackfin.h>
+#include <asm/gpio.h>
+#include <asm/portmux.h>
+#include <linux/irq.h>
+
+static struct gpio_port_t *gpio_array[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
+ (struct gpio_port_t *)PORTA_FER,
+ (struct gpio_port_t *)PORTB_FER,
+ (struct gpio_port_t *)PORTC_FER,
+ (struct gpio_port_t *)PORTD_FER,
+ (struct gpio_port_t *)PORTE_FER,
+ (struct gpio_port_t *)PORTF_FER,
+ (struct gpio_port_t *)PORTG_FER,
+ (struct gpio_port_t *)PORTH_FER,
+ (struct gpio_port_t *)PORTI_FER,
+ (struct gpio_port_t *)PORTJ_FER,
+};
+
+static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+static unsigned short reserved_peri_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+
+inline int check_gpio(unsigned short gpio)
+{
+ if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15
+ || gpio == GPIO_PH14 || gpio == GPIO_PH15
+ || gpio == GPIO_PJ14 || gpio == GPIO_PJ15
+ || gpio > MAX_BLACKFIN_GPIOS)
+ return -EINVAL;
+ return 0;
+}
+
+inline void portmux_setup(unsigned short portno, unsigned short function)
+{
+ u32 pmux;
+
+ pmux = gpio_array[gpio_bank(portno)]->port_mux;
+
+ pmux &= ~(0x3 << (2 * gpio_sub_n(portno)));
+ pmux |= (function & 0x3) << (2 * gpio_sub_n(portno));
+
+ gpio_array[gpio_bank(portno)]->port_mux = pmux;
+
+}
+
+inline u16 get_portmux(unsigned short portno)
+{
+ u32 pmux;
+
+ pmux = gpio_array[gpio_bank(portno)]->port_mux;
+
+ return (pmux >> (2 * gpio_sub_n(portno)) & 0x3);
+
+}
+
+static void port_setup(unsigned short gpio, unsigned short usage)
+{
+ if (usage == GPIO_USAGE) {
+ if (gpio_array[gpio_bank(gpio)]->port_fer & gpio_bit(gpio))
+ printk(KERN_WARNING
+ "bfin-gpio: Possible Conflict with Peripheral "
+ "usage and GPIO %d detected!\n", gpio);
+ gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
+ } else
+ gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
+ SSYNC();
+}
+
+static int __init bfin_gpio_init(void)
+{
+ printk(KERN_INFO "Blackfin GPIO Controller\n");
+
+ return 0;
+}
+
+arch_initcall(bfin_gpio_init);
+
+int peripheral_request(unsigned short per, const char *label)
+{
+ unsigned long flags;
+ unsigned short ident = P_IDENT(per);
+
+ if (!(per & P_DEFINED))
+ return -ENODEV;
+
+ if (check_gpio(ident) < 0)
+ return -EINVAL;
+
+ local_irq_save(flags);
+
+ if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
+ printk(KERN_ERR
+ "%s: Peripheral %d is already reserved as GPIO!\n",
+ __FUNCTION__, per);
+ dump_stack();
+ local_irq_restore(flags);
+ return -EBUSY;
+ }
+
+ if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
+
+ u16 funct = get_portmux(ident);
+
+ if (!((per & P_MAYSHARE) && (funct == P_FUNCT2MUX(per)))) {
+ printk(KERN_ERR
+ "%s: Peripheral %d is already reserved!\n",
+ __FUNCTION__, per);
+ dump_stack();
+ local_irq_restore(flags);
+ return -EBUSY;
+ }
+ }
+
+ reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
+
+ portmux_setup(ident, P_FUNCT2MUX(per));
+ port_setup(ident, PERIPHERAL_USAGE);
+
+ local_irq_restore(flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(peripheral_request);
+
+int peripheral_request_list(unsigned short per[], const char *label)
+{
+
+ u16 cnt;
+ int ret;
+
+ for (cnt = 0; per[cnt] != 0; cnt++) {
+ ret = peripheral_request(per[cnt], label);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(peripheral_request_list);
+
+void peripheral_free(unsigned short per)
+{
+ unsigned long flags;
+ unsigned short ident = P_IDENT(per);
+
+ if (!(per & P_DEFINED))
+ return;
+
+ if (check_gpio(ident) < 0)
+ return;
+
+ local_irq_save(flags);
+
+ if (unlikely(!(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident)))) {
+ printk(KERN_ERR "bfin-gpio: Peripheral %d wasn't reserved!\n", per);
+ dump_stack();
+ local_irq_restore(flags);
+ return;
+ }
+
+ if (!(per & P_MAYSHARE)) {
+ port_setup(ident, GPIO_USAGE);
+ }
+
+ reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);
+
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(peripheral_free);
+
+void peripheral_free_list(unsigned short per[])
+{
+ u16 cnt;
+
+ for (cnt = 0; per[cnt] != 0; cnt++) {
+ peripheral_free(per[cnt]);
+ }
+
+}
+EXPORT_SYMBOL(peripheral_free_list);
+
+/***********************************************************
+*
+* FUNCTIONS: Blackfin GPIO Driver
+*
+* INPUTS/OUTPUTS:
+* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
+*
+*
+* DESCRIPTION: Blackfin GPIO Driver API
+*
+* CAUTION:
+*************************************************************
+* MODIFICATION HISTORY :
+**************************************************************/
+
+int gpio_request(unsigned short gpio, const char *label)
+{
+ unsigned long flags;
+
+ if (check_gpio(gpio) < 0)
+ return -EINVAL;
+
+ local_irq_save(flags);
+
+ if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
+ printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio);
+ dump_stack();
+ local_irq_restore(flags);
+ return -EBUSY;
+ }
+
+ if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
+ printk(KERN_ERR
+ "bfin-gpio: GPIO %d is already reserved as Peripheral!\n", gpio);
+ dump_stack();
+ local_irq_restore(flags);
+ return -EBUSY;
+ }
+
+ reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
+
+ local_irq_restore(flags);
+
+ port_setup(gpio, GPIO_USAGE);
+
+ return 0;
+}
+EXPORT_SYMBOL(gpio_request);
+
+void gpio_free(unsigned short gpio)
+{
+ unsigned long flags;
+
+ if (check_gpio(gpio) < 0)
+ return;
+
+ local_irq_save(flags);
+
+ if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
+ printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
+ dump_stack();
+ local_irq_restore(flags);
+ return;
+ }
+
+ reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
+
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_free);
+
+void gpio_direction_input(unsigned short gpio)
+{
+ unsigned long flags;
+
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+
+ local_irq_save(flags);
+ gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
+ gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_direction_input);
+
+void gpio_direction_output(unsigned short gpio)
+{
+ unsigned long flags;
+
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+
+ local_irq_save(flags);
+ gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio);
+ gpio_array[gpio_bank(gpio)]->port_dir_set = gpio_bit(gpio);
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_direction_output);
+
+void gpio_set_value(unsigned short gpio, unsigned short arg)
+{
+ if (arg)
+ gpio_array[gpio_bank(gpio)]->port_set = gpio_bit(gpio);
+ else
+ gpio_array[gpio_bank(gpio)]->port_clear = gpio_bit(gpio);
+
+}
+EXPORT_SYMBOL(gpio_set_value);
+
+unsigned short gpio_get_value(unsigned short gpio)
+{
+ return (1 & (gpio_array[gpio_bank(gpio)]->port_data >> gpio_sub_n(gpio)));
+}
+EXPORT_SYMBOL(gpio_get_value);
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-07-12 20:20:22 +0200