blackfin architecture

This adds support for the Analog Devices Blackfin processor architecture, and
currently supports the BF533, BF532, BF531, BF537, BF536, BF534, and BF561
(Dual Core) devices, with a variety of development platforms including those
avaliable from Analog Devices (BF533-EZKit, BF533-STAMP, BF537-STAMP,
BF561-EZKIT), and Bluetechnix!  Tinyboards.

The Blackfin architecture was jointly developed by Intel and Analog Devices
Inc.  (ADI) as the Micro Signal Architecture (MSA) core and introduced it in
December of 2000.  Since then ADI has put this core into its Blackfin
processor family of devices.  The Blackfin core has the advantages of a clean,
orthogonal,RISC-like microprocessor instruction set.  It combines a dual-MAC
(Multiply/Accumulate), state-of-the-art signal processing engine and
single-instruction, multiple-data (SIMD) multimedia capabilities into a single
instruction-set architecture.

The Blackfin architecture, including the instruction set, is described by the
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
http://blackfin.uclinux.org/gf/download/frsrelease/29/2549/Blackfin_PRM.pdf

The Blackfin processor is already supported by major releases of gcc, and
there are binary and source rpms/tarballs for many architectures at:
http://blackfin.uclinux.org/gf/project/toolchain/frs There is complete
documentation, including "getting started" guides available at:
http://docs.blackfin.uclinux.org/ which provides links to the sources and
patches you will need in order to set up a cross-compiling environment for
bfin-linux-uclibc

This patch, as well as the other patches (toolchain, distribution,
uClibc) are actively supported by Analog Devices Inc, at:
http://blackfin.uclinux.org/

We have tested this on LTP, and our test plan (including pass/fails) can
be found at:
http://docs.blackfin.uclinux.org/doku.php?id=testing_the_linux_kernel

[m.kozlowski@tuxland.pl: balance parenthesis in blackfin header files]
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Aubrey Li <aubrey.li@analog.com>
Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 637 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
new file mode 100644
index 00000000000..e9f24a9a46b
--- /dev/null
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -0,0 +1,637 @@
+/*
+ * File:         arch/blackfin/kernel/bfin_gpio.c
+ * Based on:
+ * Author:       Michael Hennerich (hennerich@blackfin.uclinux.org)
+ *
+ * Created:
+ * Description:  GPIO Abstraction Layer
+ *
+ * Modified:
+ *               Copyright 2006 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
+ */
+
+/*
+*  Number     BF537/6/4    BF561    BF533/2/1
+*
+*  GPIO_0       PF0         PF0        PF0
+*  GPIO_1       PF1         PF1        PF1
+*  GPIO_2       PF2         PF2        PF2
+*  GPIO_3       PF3         PF3        PF3
+*  GPIO_4       PF4         PF4        PF4
+*  GPIO_5       PF5         PF5        PF5
+*  GPIO_6       PF6         PF6        PF6
+*  GPIO_7       PF7         PF7        PF7
+*  GPIO_8       PF8         PF8        PF8
+*  GPIO_9       PF9         PF9        PF9
+*  GPIO_10      PF10        PF10       PF10
+*  GPIO_11      PF11        PF11       PF11
+*  GPIO_12      PF12        PF12       PF12
+*  GPIO_13      PF13        PF13       PF13
+*  GPIO_14      PF14        PF14       PF14
+*  GPIO_15      PF15        PF15       PF15
+*  GPIO_16      PG0         PF16
+*  GPIO_17      PG1         PF17
+*  GPIO_18      PG2         PF18
+*  GPIO_19      PG3         PF19
+*  GPIO_20      PG4         PF20
+*  GPIO_21      PG5         PF21
+*  GPIO_22      PG6         PF22
+*  GPIO_23      PG7         PF23
+*  GPIO_24      PG8         PF24
+*  GPIO_25      PG9         PF25
+*  GPIO_26      PG10        PF26
+*  GPIO_27      PG11        PF27
+*  GPIO_28      PG12        PF28
+*  GPIO_29      PG13        PF29
+*  GPIO_30      PG14        PF30
+*  GPIO_31      PG15        PF31
+*  GPIO_32      PH0         PF32
+*  GPIO_33      PH1         PF33
+*  GPIO_34      PH2         PF34
+*  GPIO_35      PH3         PF35
+*  GPIO_36      PH4         PF36
+*  GPIO_37      PH5         PF37
+*  GPIO_38      PH6         PF38
+*  GPIO_39      PH7         PF39
+*  GPIO_40      PH8         PF40
+*  GPIO_41      PH9         PF41
+*  GPIO_42      PH10        PF42
+*  GPIO_43      PH11        PF43
+*  GPIO_44      PH12        PF44
+*  GPIO_45      PH13        PF45
+*  GPIO_46      PH14        PF46
+*  GPIO_47      PH15        PF47
+*/
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <asm/blackfin.h>
+#include <asm/gpio.h>
+#include <linux/irq.h>
+
+#ifdef BF533_FAMILY
+static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
+        (struct gpio_port_t *) FIO_FLAG_D,
+};
+#endif
+
+#ifdef BF537_FAMILY
+static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
+        (struct gpio_port_t *) PORTFIO,
+        (struct gpio_port_t *) PORTGIO,
+        (struct gpio_port_t *) PORTHIO,
+};
+
+static unsigned short *port_fer[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
+        (unsigned short *) PORTF_FER,
+        (unsigned short *) PORTG_FER,
+        (unsigned short *) PORTH_FER,
+};
+
+#endif
+
+#ifdef BF561_FAMILY
+static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
+        (struct gpio_port_t *) FIO0_FLAG_D,
+        (struct gpio_port_t *) FIO1_FLAG_D,
+        (struct gpio_port_t *) FIO2_FLAG_D,
+};
+#endif
+
+static unsigned short reserved_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+
+#ifdef CONFIG_PM
+static unsigned short wakeup_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+static unsigned char wakeup_flags_map[MAX_BLACKFIN_GPIOS];
+static struct gpio_port_s gpio_bank_saved[gpio_bank(MAX_BLACKFIN_GPIOS)];
+
+#ifdef BF533_FAMILY
+static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB};
+#endif
+
+#ifdef BF537_FAMILY
+static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX};
+#endif
+
+#ifdef BF561_FAMILY
+static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB};
+#endif
+
+#endif /* CONFIG_PM */
+
+inline int check_gpio(unsigned short gpio)
+{
+        if (gpio > MAX_BLACKFIN_GPIOS)
+                return -EINVAL;
+        return 0;
+}
+
+#ifdef BF537_FAMILY
+void port_setup(unsigned short gpio, unsigned short usage)
+{
+        if (usage == GPIO_USAGE) {
+                if (*port_fer[gpio_bank(gpio)] & gpio_bit(gpio))
+                        printk(KERN_WARNING "bfin-gpio: Possible Conflict with Peripheral "
+                               "usage and GPIO %d detected!\n", gpio);
+                *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
+        } else
+                *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
+        SSYNC();
+}
+#else
+# define port_setup(...)  do { } while (0)
+#endif
+
+
+void default_gpio(unsigned short gpio)
+{
+        unsigned short bank,bitmask;
+
+        bank = gpio_bank(gpio);
+        bitmask = gpio_bit(gpio);
+
+        gpio_bankb[bank]->maska_clear = bitmask;
+        gpio_bankb[bank]->maskb_clear = bitmask;
+        SSYNC();
+        gpio_bankb[bank]->inen &= ~bitmask;
+        gpio_bankb[bank]->dir &= ~bitmask;
+        gpio_bankb[bank]->polar &= ~bitmask;
+        gpio_bankb[bank]->both &= ~bitmask;
+        gpio_bankb[bank]->edge &= ~bitmask;
+}
+
+
+int __init bfin_gpio_init(void)
+{
+        int i;
+
+        printk(KERN_INFO "Blackfin GPIO Controller\n");
+
+        for (i = 0; i < MAX_BLACKFIN_GPIOS; i+=GPIO_BANKSIZE)
+                reserved_map[gpio_bank(i)] = 0;
+
+#if defined(BF537_FAMILY) && (defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
+# if defined(CONFIG_BFIN_MAC_RMII)
+        reserved_map[PORT_H] = 0xC373;
+# else
+        reserved_map[PORT_H] = 0xFFFF;
+# endif
+#endif
+
+        return 0;
+}
+
+arch_initcall(bfin_gpio_init);
+
+
+/***********************************************************
+*
+* FUNCTIONS: Blackfin General Purpose Ports Access Functions
+*
+* INPUTS/OUTPUTS:
+* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
+*
+*
+* DESCRIPTION: These functions abstract direct register access
+*              to Blackfin processor General Purpose
+*              Ports Regsiters
+*
+* CAUTION: These functions do not belong to the GPIO Driver API
+*************************************************************
+* MODIFICATION HISTORY :
+**************************************************************/
+
+/* Set a specific bit */
+
+#define SET_GPIO(name) \
+void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
+{ \
+        unsigned long flags; \
+        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
+        local_irq_save(flags); \
+        if (arg) \
+                gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
+        else \
+                gpio_bankb[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
+        local_irq_restore(flags); \
+} \
+EXPORT_SYMBOL(set_gpio_ ## name);
+
+SET_GPIO(dir)
+SET_GPIO(inen)
+SET_GPIO(polar)
+SET_GPIO(edge)
+SET_GPIO(both)
+
+
+#define SET_GPIO_SC(name) \
+void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
+{ \
+        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
+        if (arg) \
+                gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
+        else \
+                gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
+} \
+EXPORT_SYMBOL(set_gpio_ ## name);
+
+SET_GPIO_SC(maska)
+SET_GPIO_SC(maskb)
+
+#if defined(ANOMALY_05000311)
+void set_gpio_data(unsigned short gpio, unsigned short arg)
+{
+        unsigned long flags;
+        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+        local_irq_save(flags);
+        if (arg)
+                gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
+        else
+                gpio_bankb[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
+        bfin_read_CHIPID();
+        local_irq_restore(flags);
+}
+EXPORT_SYMBOL(set_gpio_data);
+#else
+SET_GPIO_SC(data)
+#endif
+
+
+#if defined(ANOMALY_05000311)
+void set_gpio_toggle(unsigned short gpio)
+{
+        unsigned long flags;
+        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+        local_irq_save(flags);
+        gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
+        bfin_read_CHIPID();
+        local_irq_restore(flags);
+}
+#else
+void set_gpio_toggle(unsigned short gpio)
+{
+        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+        gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
+}
+#endif
+EXPORT_SYMBOL(set_gpio_toggle);
+
+
+/*Set current PORT date (16-bit word)*/
+
+#define SET_GPIO_P(name) \
+void set_gpiop_ ## name(unsigned short gpio, unsigned short arg) \
+{ \
+        gpio_bankb[gpio_bank(gpio)]->name = arg; \
+} \
+EXPORT_SYMBOL(set_gpiop_ ## name);
+
+SET_GPIO_P(dir)
+SET_GPIO_P(inen)
+SET_GPIO_P(polar)
+SET_GPIO_P(edge)
+SET_GPIO_P(both)
+SET_GPIO_P(maska)
+SET_GPIO_P(maskb)
+
+
+#if defined(ANOMALY_05000311)
+void set_gpiop_data(unsigned short gpio, unsigned short arg)
+{
+        unsigned long flags;
+        local_irq_save(flags);
+        gpio_bankb[gpio_bank(gpio)]->data = arg;
+        bfin_read_CHIPID();
+        local_irq_restore(flags);
+}
+EXPORT_SYMBOL(set_gpiop_data);
+#else
+SET_GPIO_P(data)
+#endif
+
+
+
+/* Get a specific bit */
+
+#define GET_GPIO(name) \
+unsigned short get_gpio_ ## name(unsigned short gpio) \
+{ \
+        return (0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio))); \
+} \
+EXPORT_SYMBOL(get_gpio_ ## name);
+
+GET_GPIO(dir)
+GET_GPIO(inen)
+GET_GPIO(polar)
+GET_GPIO(edge)
+GET_GPIO(both)
+GET_GPIO(maska)
+GET_GPIO(maskb)
+
+
+#if defined(ANOMALY_05000311)
+unsigned short get_gpio_data(unsigned short gpio)
+{
+        unsigned long flags;
+        unsigned short ret;
+        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+        local_irq_save(flags);
+        ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->data >> gpio_sub_n(gpio));
+        bfin_read_CHIPID();
+        local_irq_restore(flags);
+        return ret;
+}
+EXPORT_SYMBOL(get_gpio_data);
+#else
+GET_GPIO(data)
+#endif
+
+/*Get current PORT date (16-bit word)*/
+
+#define GET_GPIO_P(name) \
+unsigned short get_gpiop_ ## name(unsigned short gpio) \
+{ \
+        return (gpio_bankb[gpio_bank(gpio)]->name);\
+} \
+EXPORT_SYMBOL(get_gpiop_ ## name);
+
+GET_GPIO_P(dir)
+GET_GPIO_P(inen)
+GET_GPIO_P(polar)
+GET_GPIO_P(edge)
+GET_GPIO_P(both)
+GET_GPIO_P(maska)
+GET_GPIO_P(maskb)
+
+#if defined(ANOMALY_05000311)
+unsigned short get_gpiop_data(unsigned short gpio)
+{
+        unsigned long flags;
+        unsigned short ret;
+        local_irq_save(flags);
+        ret = gpio_bankb[gpio_bank(gpio)]->data;
+        bfin_read_CHIPID();
+        local_irq_restore(flags);
+        return ret;
+}
+EXPORT_SYMBOL(get_gpiop_data);
+#else
+GET_GPIO_P(data)
+#endif
+
+#ifdef CONFIG_PM
+/***********************************************************
+*
+* FUNCTIONS: Blackfin PM Setup API
+*
+* INPUTS/OUTPUTS:
+* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
+* type -
+*       PM_WAKE_RISING
+*       PM_WAKE_FALLING
+*       PM_WAKE_HIGH
+*       PM_WAKE_LOW
+*       PM_WAKE_BOTH_EDGES
+*
+* DESCRIPTION: Blackfin PM Driver API
+*
+* CAUTION:
+*************************************************************
+* MODIFICATION HISTORY :
+**************************************************************/
+int gpio_pm_wakeup_request(unsigned short gpio, unsigned char type)
+{
+        unsigned long flags;
+
+        if ((check_gpio(gpio) < 0) || !type)
+                return -EINVAL;
+
+        local_irq_save(flags);
+
+        wakeup_map[gpio_bank(gpio)] |= gpio_bit(gpio);
+        wakeup_flags_map[gpio] = type;
+        local_irq_restore(flags);
+
+        return 0;
+}
+EXPORT_SYMBOL(gpio_pm_wakeup_request);
+
+void gpio_pm_wakeup_free(unsigned short gpio)
+{
+        unsigned long flags;
+
+        if (check_gpio(gpio) < 0)
+                return;
+
+        local_irq_save(flags);
+
+        wakeup_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
+
+        local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_pm_wakeup_free);
+
+static int bfin_gpio_wakeup_type(unsigned short gpio, unsigned char type)
+{
+        port_setup(gpio, GPIO_USAGE);
+        set_gpio_dir(gpio, 0);
+        set_gpio_inen(gpio, 1);
+
+        if (type & (PM_WAKE_RISING | PM_WAKE_FALLING))
+                set_gpio_edge(gpio, 1);
+         else
+                set_gpio_edge(gpio, 0);
+
+        if ((type & (PM_WAKE_BOTH_EDGES)) == (PM_WAKE_BOTH_EDGES))
+                set_gpio_both(gpio, 1);
+        else
+                set_gpio_both(gpio, 0);
+
+        if ((type & (PM_WAKE_FALLING | PM_WAKE_LOW)))
+                set_gpio_polar(gpio, 1);
+        else
+                set_gpio_polar(gpio, 0);
+
+        SSYNC();
+
+        return 0;
+}
+
+u32 gpio_pm_setup(void)
+{
+        u32 sic_iwr = 0;
+        u16 bank, mask, i, gpio;
+
+        for (i = 0; i < MAX_BLACKFIN_GPIOS; i+=GPIO_BANKSIZE) {
+                mask = wakeup_map[gpio_bank(i)];
+                bank = gpio_bank(i);
+
+                gpio_bank_saved[bank].maskb = gpio_bankb[bank]->maskb;
+                gpio_bankb[bank]->maskb = 0;
+
+                if (mask) {
+#ifdef BF537_FAMILY
+                        gpio_bank_saved[bank].fer   = *port_fer[bank];
+#endif
+                        gpio_bank_saved[bank].inen  = gpio_bankb[bank]->inen;
+                        gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar;
+                        gpio_bank_saved[bank].dir   = gpio_bankb[bank]->dir;
+                        gpio_bank_saved[bank].edge  = gpio_bankb[bank]->edge;
+                        gpio_bank_saved[bank].both  = gpio_bankb[bank]->both;
+
+                        gpio = i;
+
+                        while (mask) {
+                                if (mask & 1) {
+                                        bfin_gpio_wakeup_type(gpio, wakeup_flags_map[gpio]);
+                                        set_gpio_data(gpio, 0); /*Clear*/
+                                }
+                                gpio++;
+                                mask >>= 1;
+                        }
+
+                        sic_iwr |= 1 << (sic_iwr_irqs[bank] - (IRQ_CORETMR + 1));
+                        gpio_bankb[bank]->maskb_set = wakeup_map[gpio_bank(i)];
+                }
+        }
+
+        if (sic_iwr)
+                return sic_iwr;
+        else
+                return IWR_ENABLE_ALL;
+}
+
+
+void gpio_pm_restore(void)
+{
+        u16 bank, mask, i;
+
+        for (i = 0; i < MAX_BLACKFIN_GPIOS; i+=GPIO_BANKSIZE) {
+                mask = wakeup_map[gpio_bank(i)];
+                bank = gpio_bank(i);
+
+                if (mask) {
+#ifdef BF537_FAMILY
+                        *port_fer[bank]         = gpio_bank_saved[bank].fer;
+#endif
+                        gpio_bankb[bank]->inen  = gpio_bank_saved[bank].inen;
+                        gpio_bankb[bank]->dir   = gpio_bank_saved[bank].dir;
+                        gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar;
+                        gpio_bankb[bank]->edge  = gpio_bank_saved[bank].edge;
+                        gpio_bankb[bank]->both  = gpio_bank_saved[bank].both;
+                }
+
+                gpio_bankb[bank]->maskb = gpio_bank_saved[bank].maskb;
+        }
+}
+
+#endif
+
+/***********************************************************
+*
+* 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_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;
+        }
+        reserved_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_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;
+        }
+
+        default_gpio(gpio);
+
+        reserved_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_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+
+        local_irq_save(flags);
+        gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
+        gpio_bankb[gpio_bank(gpio)]->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_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+
+        local_irq_save(flags);
+        gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
+        gpio_bankb[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
+        local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_direction_output);