1 files changed, 84 insertions, 4 deletions

diff --git a/arch/arm/mach-mx3/iomux.c b/arch/arm/mach-mx3/iomux.c
index 7a5088b519a8..40ffc5a664d9 100644
--- a/arch/arm/mach-mx3/iomux.c
+++ b/arch/arm/mach-mx3/iomux.c
@@ -1,6 +1,7 @@
 /*
  * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
  * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
+ * Copyright (C) 2009 by Valentin Longchamp <valentin.longchamp@epfl.ch>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -21,6 +22,7 @@
 #include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/gpio.h>
+#include <linux/kernel.h>
 #include <mach/hardware.h>
 #include <mach/gpio.h>
 #include <mach/iomux-mx3.h>
@@ -38,6 +40,8 @@
 static DEFINE_SPINLOCK(gpio_mux_lock);
 
 #define IOMUX_REG_MASK (IOMUX_PADNUM_MASK & ~0x3)
+
+unsigned long mxc_pin_alloc_map[NB_PORTS * 32 / BITS_PER_LONG];
 /*
  * set the mode for a IOMUX pin.
  */
@@ -50,9 +54,6 @@ int mxc_iomux_mode(unsigned int pin_mode)
         field = pin_mode & 0x3;
         mode = (pin_mode & IOMUX_MODE_MASK) >> IOMUX_MODE_SHIFT;
 
-        pr_debug("%s: reg offset = 0x%x field = %d mode = 0x%02x\n",
-                        __func__, (pin_mode & IOMUX_REG_MASK), field, mode);
-
         spin_lock(&gpio_mux_lock);
 
         l = __raw_readl(reg);
@@ -93,6 +94,86 @@ void mxc_iomux_set_pad(enum iomux_pins pin, u32 config)
 EXPORT_SYMBOL(mxc_iomux_set_pad);
 
 /*
+ * setups a single pin:
+ *      - reserves the pin so that it is not claimed by another driver
+ *      - setups the iomux according to the configuration
+ *      - if the pin is configured as a GPIO, we claim it through kernel gpiolib
+ */
+int mxc_iomux_setup_pin(const unsigned int pin, const char *label)
+{
+        unsigned pad = pin & IOMUX_PADNUM_MASK;
+        unsigned gpio;
+
+        if (pad >= (PIN_MAX + 1)) {
+                printk(KERN_ERR "mxc_iomux: Attempt to request nonexistant pin %u for \"%s\"\n",
+                        pad, label ? label : "?");
+                return -EINVAL;
+        }
+
+        if (test_and_set_bit(pad, mxc_pin_alloc_map)) {
+                printk(KERN_ERR "mxc_iomux: pin %u already used. Allocation for \"%s\" failed\n",
+                        pad, label ? label : "?");
+                return -EINVAL;
+        }
+        mxc_iomux_mode(pin);
+
+        /* if we have a gpio, we can allocate it */
+        gpio = (pin & IOMUX_GPIONUM_MASK) >> IOMUX_GPIONUM_SHIFT;
+        if (gpio < (GPIO_PORT_MAX + 1) * 32)
+                if (gpio_request(gpio, label))
+                        return -EINVAL;
+
+        return 0;
+}
+EXPORT_SYMBOL(mxc_iomux_setup_pin);
+
+int mxc_iomux_setup_multiple_pins(unsigned int *pin_list, unsigned count,
+                const char *label)
+{
+        unsigned int *p = pin_list;
+        int i;
+        int ret = -EINVAL;
+
+        for (i = 0; i < count; i++) {
+                if (mxc_iomux_setup_pin(*p, label))
+                        goto setup_error;
+                p++;
+        }
+        return 0;
+
+setup_error:
+        mxc_iomux_release_multiple_pins(pin_list, i);
+        return ret;
+}
+EXPORT_SYMBOL(mxc_iomux_setup_multiple_pins);
+
+void mxc_iomux_release_pin(const unsigned int pin)
+{
+        unsigned pad = pin & IOMUX_PADNUM_MASK;
+        unsigned gpio;
+
+        if (pad < (PIN_MAX + 1))
+                clear_bit(pad, mxc_pin_alloc_map);
+
+        gpio = (pin & IOMUX_GPIONUM_MASK) >> IOMUX_GPIONUM_SHIFT;
+        if (gpio < (GPIO_PORT_MAX + 1) * 32)
+                gpio_free(gpio);
+}
+EXPORT_SYMBOL(mxc_iomux_release_pin);
+
+void mxc_iomux_release_multiple_pins(unsigned int *pin_list, int count)
+{
+        unsigned int *p = pin_list;
+        int i;
+
+        for (i = 0; i < count; i++) {
+                mxc_iomux_release_pin(*p);
+                p++;
+        }
+}
+EXPORT_SYMBOL(mxc_iomux_release_multiple_pins);
+
+/*
  * This function enables/disables the general purpose function for a particular
  * signal.
  */
@@ -111,4 +192,3 @@ void mxc_iomux_set_gpr(enum iomux_gp_func gp, bool en)
         spin_unlock(&gpio_mux_lock);
 }
 EXPORT_SYMBOL(mxc_iomux_set_gpr);
-