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/*

 * FILE NAME au1000_gpio.c

 *

 * BRIEF MODULE DESCRIPTION

 *  Driver for Alchemy Au1000 GPIO.

 *

 *  Author: MontaVista Software, Inc.  <source@mvista.com>

 *          Steve Longerbeam <stevel@mvista.com>

 *

 * Copyright 2001 MontaVista Software Inc.

 *

 *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED

 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF

 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN

 *  NO  EVENT  SHALL   THE AUTHOR  BE   LIABLE FOR ANY   DIRECT, INDIRECT,

 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF

 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON

 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT

 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 *  You should have received a copy of the  GNU General Public License along

 *  with this program; if not, write  to the Free Software Foundation, Inc.,

 *  675 Mass Ave, Cambridge, MA 02139, USA.

 */

#include <linux/module.h>

#include <linux/config.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/miscdevice.h>

#include <linux/init.h>

#include <asm/uaccess.h>

#include <asm/io.h>

#include <asm/au1000.h>

#include <asm/au1000_gpio.h>

#define VERSION "0.01"

static const struct {

        u32 active_hi;

        u32 avail_mask;

} pinfunc_to_avail[15] = {

        {1,  0x7<<16},   // 0  = SSI0     / GPIO[18:16]

        {-1, 0},         // 1  = AC97     / SSI1

        {1,  1<<19},     // 2  = IRDA     / GPIO19

        {1,  1<<20},     // 3  = UART0    / GPIO20

        {1,  0x1f<<24},  // 4  = NIC2     / GPIO[28:24]

        {1,  0x7<<29},   // 5  = I2S      / GPIO[31:29]

        {0,  1<<8},      // 6  = I2SDI    / GPIO8

        {0,  0x3f<<9},   // 7  = UART3    / GPIO[14:9]

        {0,  1<<15},     // 8  = IRFIRSEL / GPIO15

        {0,  1<<2},      // 9  = EXTCLK0 or OSC / GPIO2

        {0,  1<<3},      // 10 = EXTCLK1  / GPIO3

        {0,  1<<6},      // 11 = SMROMCKE / GPIO6

        {1,  1<<21},     // 12 = UART1    / GPIO21

        {1,  1<<22},     // 13 = UART2    / GPIO22

        {1,  1<<23}      // 14 = UART3    / GPIO23

};

u32 get_au1000_avail_gpio_mask(void)

{

        int i;

        u32 pinfunc = inl(SYS_PINFUNC);

        u32 avail_mask = 0; // start with no gpio available

        // first, check for GPIO's reprogrammed as peripheral pins

        for (i=0; i<15; i++) {

                if (pinfunc_to_avail[i].active_hi < 0)

                        continue;

                if (!(pinfunc_to_avail[i].active_hi ^

                      ((pinfunc & (1<<i)) ? 1:0)))

                        avail_mask |= pinfunc_to_avail[i].avail_mask;

        }

        // check for GPIO's used as interrupt sources

        avail_mask &= ~(inl(IC1_MASKRD) &

                        (inl(IC1_CFG0RD) | inl(IC1_CFG1RD)));

#ifdef CONFIG_USB_OHCI

        avail_mask &= ~((1<<4) | (1<<11));

#ifndef CONFIG_AU1X00_USB_DEVICE

        avail_mask &= ~((1<<5) | (1<<13));

#endif

#endif

        return avail_mask;

}

/*

 * Tristate the requested GPIO pins specified in data.

 * Only available GPIOs will be tristated.

 */

int au1000gpio_tristate(u32 data)

{

        data &= get_au1000_avail_gpio_mask();

        if (data)

                outl(data, SYS_TRIOUTCLR);

        return 0;

}

/*

 * Return the pin state. Pins configured as outputs will return

 * the output state, and pins configured as inputs (tri-stated)

 * will return input pin state.

 */

int au1000gpio_in(u32 *data)

{

        *data = inl(SYS_PINSTATERD);

        return 0;

}

/*

 * Set/clear GPIO pins. Only available GPIOs will be affected.

 */

int au1000gpio_set(u32 data)

{

        data &= get_au1000_avail_gpio_mask();

        if (data)

                outl(data, SYS_OUTPUTSET);

        return 0;

}

int au1000gpio_clear(u32 data)

{

        data &= get_au1000_avail_gpio_mask();

        if (data)

                outl(data, SYS_OUTPUTCLR);

        return 0;

}

/*

 * Output data to GPIO pins. Only available GPIOs will be affected.

 */

int au1000gpio_out(u32 data)

{

        au1000gpio_set(data);

        au1000gpio_clear(~data);

        return 0;

}

EXPORT_SYMBOL(get_au1000_avail_gpio_mask);

EXPORT_SYMBOL(au1000gpio_tristate);

EXPORT_SYMBOL(au1000gpio_in);

EXPORT_SYMBOL(au1000gpio_set);

EXPORT_SYMBOL(au1000gpio_clear);

EXPORT_SYMBOL(au1000gpio_out);

static int au1000gpio_open(struct inode *inode, struct file *file)

{

        MOD_INC_USE_COUNT;

        return 0;

}

static int au1000gpio_release(struct inode *inode, struct file *file)

{

        MOD_DEC_USE_COUNT;

        return 0;

}

static int au1000gpio_ioctl(struct inode *inode, struct file *file,

                            unsigned int cmd, unsigned long arg)

{

        int status;

        u32 val;

        switch(cmd) {

        case AU1000GPIO_IN:

                status = au1000gpio_in(&val);

                if (status != 0)

                        return status;

                return put_user(val, (u32 *)arg);

        case AU1000GPIO_OUT:

                if (get_user(val, (u32 *)arg))

                        return -EFAULT;

                return au1000gpio_out(val);

        case AU1000GPIO_SET:

                if (get_user(val, (u32 *)arg))

                        return -EFAULT;

                return au1000gpio_set(val);

        case AU1000GPIO_CLEAR:

                if (get_user(val, (u32 *)arg))

                        return -EFAULT;

                return au1000gpio_clear(val);

        case AU1000GPIO_TRISTATE:

                if (get_user(val, (u32 *)arg))

                        return -EFAULT;

                return au1000gpio_tristate(val);

        case AU1000GPIO_AVAIL_MASK:

                return put_user(get_au1000_avail_gpio_mask(),

                                (u32 *)arg);

        default:

                return -ENOIOCTLCMD;

        }

        return 0;

}

static struct file_operations au1000gpio_fops =

{

        owner:          THIS_MODULE,

        ioctl:          au1000gpio_ioctl,

        open:           au1000gpio_open,

        release:        au1000gpio_release,

};

static struct miscdevice au1000gpio_miscdev =

{

        GPIO_MINOR,

        "au1000_gpio",

        &au1000gpio_fops

};

int __init au1000gpio_init(void)

{

        misc_register(&au1000gpio_miscdev);

        printk("Au1000 gpio driver, version %s\n", VERSION);

        return 0;

}

void __exit au1000gpio_exit(void)

{

        misc_deregister(&au1000gpio_miscdev);

}

module_init(au1000gpio_init);

module_exit(au1000gpio_exit);