patch-2.4.19 linux-2.4.19/drivers/char/au1000_gpio.c

• Lines: 271
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/drivers/char/au1000_gpio.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/drivers/char/au1000_gpio.c linux-2.4.19/drivers/char/au1000_gpio.c
@@ -0,0 +1,270 @@
+/*
+ * 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_AU1000_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);