[PATCH] drivers: PMC MSP71xx GPIO char driver
Patch to add a GPIO char driver for the PMC-Sierra
MSP71xx devices.
This patch references some platform support files previously
submitted to the [EMAIL PROTECTED] list.
Thanks,
Marc
Signed-off-by: Marc St-Jean <[EMAIL PROTECTED]>
---
Re-posting patch with recommended changes:
-Cleanup on style and formatting for comments, macros, etc.
-Moved some driver private data structures from .h to .c.
-Eliminated MSP_GPIO_BIT macro.
-Added call to new read_reg32 function to eliminate need
for use of volatile keyword.
-Made use of schedule_timeout_interruptible() call instead
of multiple calls.
-Added calls to kthread_should_stop and try_to_freeze().
drivers/char/Kconfig | 4
drivers/char/Makefile | 1
drivers/char/pmcmsp_gpio.c | 644 +++++++++++++++++++++++++
include/asm-mips/pmc-sierra/msp71xx/msp_gpio.h | 98 +++
4 files changed, 747 insertions(+)
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index ed5453f..dea96a0 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -372,6 +372,10 @@ config ISTALLION
To compile this driver as a module, choose M here: the
module will be called istallion.
+config PMCMSP_GPIO
+ tristate "PMC MSP 7120 GPIO device support"
+ depends on MIPS && (PMC_MSP7120_EVAL || PMC_MSP7120_GW ||
PMC_MSP7120_FPGA)
+
config AU1X00_GPIO
tristate "Alchemy Au1000 GPIO device support"
depends on MIPS && SOC_AU1X00
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 3ed7647..9abbcc1 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -86,6 +86,7 @@ obj-$(CONFIG_DS1620) += ds1620.o
obj-$(CONFIG_HW_RANDOM) += hw_random/
obj-$(CONFIG_COBALT_LCD) += lcd.o
obj-$(CONFIG_AU1000_GPIO) += au1000_gpio.o
+obj-$(CONFIG_PMCMSP_GPIO) += pmcmsp_gpio.o
obj-$(CONFIG_PPDEV) += ppdev.o
obj-$(CONFIG_NWBUTTON) += nwbutton.o
obj-$(CONFIG_NWFLASH) += nwflash.o
diff --git a/drivers/char/pmcmsp_gpio.c b/drivers/char/pmcmsp_gpio.c
new file mode 100644
index 0000000..e2d65bd
--- /dev/null
+++ b/drivers/char/pmcmsp_gpio.c
@@ -0,0 +1,644 @@
+/*
+ * Driver for the PMC MSP7120 reference board GPIO pins
+ *
+ * Copyright 2005-2007 PMC-Sierra, 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/ioport.h>
+#include <linux/spinlock.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/kthread.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+
+#include <asm/io.h>
+#include <asm/war.h>
+#include <asm/regops.h>
+
+#include <msp_regs.h>
+#include <msp_gpio.h>
+
+/* -- Private definitions -- */
+
+/* Special bitflags and whatnot for the driver's convenience */
+#define GPIO_REG_COUNT 4
+const u32 GPIO_DATA_COUNT[] = { 2, 4, 4, 6 };
+const u32 GPIO_DATA_SHIFT[] = { 0, 2, 6, 10 };
+const u32 GPIO_DATA_MASK[] = { 0x03, 0x0f, 0x0f, 0x3f };
+u32 * const GPIO_DATA_REG[] = {
+ (u32 *)GPIO_DATA1_REG, (u32 *)GPIO_DATA2_REG,
+ (u32 *)GPIO_DATA3_REG, (u32 *)GPIO_DATA4_REG,
+};
+const u32 GPIO_CFG_MASK[] = { 0x0000ff, 0x00ffff, 0x00ffff, 0xffffff };
+u32 * const GPIO_CFG_REG[] = {
+ (u32 *)GPIO_CFG1_REG, (u32 *)GPIO_CFG2_REG,
+ (u32 *)GPIO_CFG3_REG, (u32 *)GPIO_CFG4_REG,
+};
+
+#define GPIO_CFG_SHIFT(i) (i * 4)
+#define GPIO_CFG_PINMASK 0xf
+
+/* The extended gpio register */
+
+#define EXTENDED_GPIO_COUNT 4
+#define EXTENDED_GPIO_SHIFT 16
+#define EXTENDED_GPIO_MASK 0x0f
+
+#define EXTENDED_GPIO_DATA_SHIFT(i) (i * 2)
+#define EXTENDED_GPIO_DATA_MASK(i) (0x3 << (i*2))
+#define EXTENDED_GPIO_DATA_SET 0x2
+#define EXTENDED_GPIO_DATA_CLR 0x1
+#define EXTENDED_GPIO_CFG_SHIFT(i) ((i * 2) + 16)
+#define EXTENDED_GPIO_CFG_MASK(i) (0x3 << ((i*2)+16))
+#define EXTENDED_GPIO_CFG_DISABLE 0x2
+#define EXTENDED_GPIO_CFG_ENABLE 0x1
+
+/* -- Data structures -- */
+
+static DEFINE_SPINLOCK(msp_gpio_spinlock);
+
+static struct task_struct *msp_blinkthread;
+static DEFINE_SPINLOCK(msp_blink_lock);
+static DECLARE_COMPLETION(msp_blink_wait);
+
+struct blink_table {
+ u32 count;
+ u32 period;
+ u32 dcycle;
+};
+
+static struct blink_table blink_table[MSP_NUM_GPIOS];
+
+/* -- Utility functions -- */
+
+/* Define the following for extra debug output */
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(args...) printk(args)
+#else
+#define DBG(args...) do {} while (0)
+#endif
+
+/* Reads the data bits from a single register set */
+static u32 msp_gpio_read_data_basic(int reg)
+{
+ return read_reg32(GPIO_DATA_REG[reg], GPIO_DATA_MASK[reg]);
+}
+
+/* Reads the data bits from the extended register set */
+static u32 msp_gpio_read_data_extended(void)
+{
+ int pin;
+ u32 tmp = *EXTENDED_GPIO_REG;
+ u32 retval = 0;
+
+ for (pin = 0; pin < EXTENDED_GPIO_COUNT; pin++) {
+ u32 bit = 0;
+
+ /*
+ * In output mode, read CLR bit
+ * In input mode, read SET bit
+ */
+ if (tmp & (EXTENDED_GPIO_CFG_ENABLE <<
+ EXTENDED_GPIO_CFG_SHIFT(pin)))
+ bit = EXTENDED_GPIO_DATA_CLR <<
+ EXTENDED_GPIO_DATA_SHIFT(pin);
+ else
+ bit = EXTENDED_GPIO_DATA_SET <<
+ EXTENDED_GPIO_DATA_SHIFT(pin);
+
+ if (tmp & bit)
+ retval |= 1 << pin;
+ }
+
+ return retval;
+}
+
+/*
+ * Reads the current state of all 20 pins, putting the values in
+ * the lowest 20 bits (1=HI, 0=LO)
+ */
+static u32 msp_gpio_read_data(void)
+{
+ int reg;
+ u32 retval = 0;
+
+ spin_lock(&msp_gpio_spinlock);
+ for (reg = 0; reg < GPIO_REG_COUNT; reg++)
+ retval |= msp_gpio_read_data_basic(reg) <<
+ GPIO_DATA_SHIFT[reg];
+ retval |= msp_gpio_read_data_extended() << EXTENDED_GPIO_SHIFT;
+ spin_unlock(&msp_gpio_spinlock);
+
+ DBG("%s: 0x%08x\n", __FUNCTION__, retval);
+ return retval;
+}
+
+/*
+ * This assumes both data and mask are register-ready, and does
+ * the set atomically
+ */
+static void msp_gpio_write_data_basic(int reg, u32 data, u32 mask)
+{
+ set_value_reg32(GPIO_DATA_REG[reg], mask, data);
+}
+
+/*
+ * The four lowest bits of 'data' and 'mask' are used, and the set
+ * is done atomically
+ */
+static void msp_gpio_write_data_extended(u32 data, u32 mask)
+{
+ int i;
+ u32 tmpmask = 0xffffffff, tmpdata = 0;
+
+ /* Set all SET/CLR values based on data bits passed in */
+ for (i = 0; i < EXTENDED_GPIO_COUNT; i++) {
+ if (mask & (1 << i)) {
+ if (data & (1 << i))
+ /* Set the bit HI */
+ tmpdata |= EXTENDED_GPIO_DATA_SET <<
+ EXTENDED_GPIO_DATA_SHIFT(i);
+ else
+ /* Set the bit LO */
+ tmpdata |= EXTENDED_GPIO_DATA_CLR <<
+ EXTENDED_GPIO_DATA_SHIFT(i);
+ }
+ }
+
+ set_value_reg32(EXTENDED_GPIO_REG, tmpmask, tmpdata);
+}
+
+/*
+ * Sets all masked GPIOs based on the first 20 bits of the data
+ * passed in (1=HI, 0=LO)
+ */
+static void msp_gpio_write_data(u32 data, u32 mask)
+{
+ int reg;
+
+ spin_lock(&msp_gpio_spinlock);
+ for (reg = 0; reg < GPIO_REG_COUNT; reg++) {
+ u32 tmpdata = (data >> GPIO_DATA_SHIFT[reg]) &
+ GPIO_DATA_MASK[reg];
+ u32 tmpmask = (mask >> GPIO_DATA_SHIFT[reg]) &
+ GPIO_DATA_MASK[reg];
+ if (tmpmask > 0)
+ msp_gpio_write_data_basic(reg, tmpdata, tmpmask);
+ }
+ msp_gpio_write_data_extended(data >> EXTENDED_GPIO_SHIFT,
+ mask >> EXTENDED_GPIO_SHIFT);
+ spin_unlock(&msp_gpio_spinlock);
+}
+
+/* Reads the config bits from a single register set */
+static u32 msp_gpio_read_cfg_basic(int reg)
+{
+ return read_reg32(GPIO_CFG_REG[reg], GPIO_CFG_MASK[reg]);
+}
+
+/*
+ * This assumes both data and mask are register-ready, and does
+ * the write atomically
+ */
+static void msp_gpio_write_cfg_basic(int reg, u32 data, u32 mask)
+{
+ set_value_reg32(GPIO_CFG_REG[reg], mask, data);
+}
+
+/*
+ * Reads the configuration of the extended pins, returning the current
+ * configuration in the lowest 4 bits (1-output, 0-input)
+ */
+static u32 msp_gpio_read_cfg_extended(void)
+{
+ int i;
+ u32 tmp = *EXTENDED_GPIO_REG;
+ u32 retval = 0;
+
+ /* Read all ENABLE/DISABLE values and translate to single bits */
+ for (i = 0; i < EXTENDED_GPIO_COUNT; i++) {
+ if (tmp & (EXTENDED_GPIO_CFG_ENABLE <<
+ EXTENDED_GPIO_CFG_SHIFT(i)))
+ /* Pin is OUTPUT */
+ retval |= 1 << i;
+ else
+ /* Pin is INPUT */
+ retval &= ~(1 << i);
+ }
+
+ return retval;
+}
+
+/*
+ * Sets the masked extended pins to (1-output, 0-input)
+ * (uses 4 lowest bits of the mask)
+ * Does the write atomically
+ */
+static void msp_gpio_write_cfg_extended(u32 data, u32 mask)
+{
+ int i;
+ u32 tmpmask = 0xffffffff, tmpdata = 0;
+
+ /* Set all ENABLE/DISABLE values based on mask bits passed in */
+ for (i = 0; i < EXTENDED_GPIO_COUNT; i++) {
+ if (mask & (1 << i)) {
+ if (data & (1 << i))
+ /* Set the pin to OUTPUT */
+ tmpdata |= EXTENDED_GPIO_CFG_ENABLE <<
+ EXTENDED_GPIO_CFG_SHIFT(i);
+ else
+ /* Set the pin to INPUT */
+ tmpdata |= EXTENDED_GPIO_CFG_DISABLE <<
+ EXTENDED_GPIO_CFG_SHIFT(i);
+ }
+ }
+
+ set_value_reg32(EXTENDED_GPIO_REG, tmpmask, tmpdata);
+}
+
+/*
+ * Sets all GPIOs to input/output based on the first 20 bits of the mask
+ * (1-output, 0-input)
+ */
+static void msp_gpio_write_cfg(msp_gpio_mode_t mode, u32 mask)
+{
+ int reg;
+ u32 extdata = 0, extmask = 0;
+
+ spin_lock(&msp_gpio_spinlock);
+ for (reg = 0; reg < GPIO_REG_COUNT; reg++) {
+ int pin;
+ u32 tmpdata = 0, tmpmask = 0;
+ for (pin = 0; pin < GPIO_DATA_COUNT[reg]; pin++) {
+ if (mask & (1 << (GPIO_DATA_SHIFT[reg] + pin))) {
+ tmpmask |= GPIO_CFG_PINMASK <<
+ GPIO_CFG_SHIFT(pin);
+ tmpdata |= (u32)mode <<
+ GPIO_CFG_SHIFT(pin);
+ }
+ }
+ if (tmpmask)
+ msp_gpio_write_cfg_basic(reg, tmpdata, tmpmask);
+ }
+
+ extmask = mask >> EXTENDED_GPIO_SHIFT;
+ if (mode == MSP_GPIO_INPUT)
+ extdata = 0;
+ else if (mode == MSP_GPIO_OUTPUT)
+ extdata = 0xf;
+ else
+ extmask = 0;
+ if (extmask)
+ msp_gpio_write_cfg_extended(extdata, extmask);
+ spin_unlock(&msp_gpio_spinlock);
+}
+
+/*
+ * Reads all GPIO config values and checks if they match the pin mode given,
+ * placing the result in the lowest 20 bits of the result, one bit per pin
+ * (1-pin matches mode give, 0-pin does not match)
+ */
+static u32 msp_gpio_read_cfg(u32 mode)
+{
+ u32 retval = 0;
+ int reg;
+
+ spin_lock(&msp_gpio_spinlock);
+ for (reg = 0; reg < GPIO_REG_COUNT; reg++) {
+ int pin;
+ u32 tmpdata = msp_gpio_read_cfg_basic(reg);
+ for (pin = 0; pin < GPIO_DATA_COUNT[reg]; pin++) {
+ u32 val = (tmpdata >> GPIO_CFG_SHIFT(pin)) &
+ GPIO_CFG_PINMASK;
+ if (val == mode)
+ retval |= 1 << (GPIO_DATA_SHIFT[reg] + pin);
+ }
+ }
+
+ /* Extended pins only have INPUT or OUTPUT pins */
+ if (mode == MSP_GPIO_INPUT)
+ retval |= (~msp_gpio_read_cfg_extended() & EXTENDED_GPIO_MASK)
+ << EXTENDED_GPIO_SHIFT;
+ else if (mode == MSP_GPIO_OUTPUT)
+ retval |= (msp_gpio_read_cfg_extended() & EXTENDED_GPIO_MASK)
+ << EXTENDED_GPIO_SHIFT;
+ spin_unlock(&msp_gpio_spinlock);
+
+ DBG("%s(0x%02x): 0x%08x\n", __FUNCTION__, mode, retval);
+ return retval;
+}
+
+/* -- Public functions -- */
+
+/*
+ * Reads the bits specified by the mask and puts the values in data.
+ * May include output statuses also, if in mask.
+ *
+ * Returns 0 on success
+ */
+int msp_gpio_in(u32 *data, u32 mask)
+{
+ *data = msp_gpio_read_data() & mask;
+
+ return 0;
+}
+
+/*
+ * Sets the specified data on the masked pins
+ *
+ * Returns 0 on success or one of the following:
+ * -EINVAL if any of the pins in the mask are not free or not already
+ * in output mode
+ */
+int msp_gpio_out(u32 data, u32 mask)
+{
+ if ((mask & ~MSP_GPIO_FREE_MASK) != 0) {
+ printk(KERN_WARNING
+ "Invalid GPIO mask - References non-free pins\n");
+ return -EINVAL;
+ }
+ if ((mask & ~msp_gpio_read_cfg(MSP_GPIO_OUTPUT)) != 0) {
+ printk(KERN_WARNING
+ "Invalid GPIO mask - Cannot set non-output pins\n");
+ return -EINVAL;
+ }
+
+ msp_gpio_noblink(mask);
+ msp_gpio_write_data(data, mask);
+
+ return 0;
+}
+
+/*
+ * Sets masked pins to the specified msp_gpio_mode_t
+ *
+ * Returns 0 on success or one of the following:
+ * -EINVAL if any of the pins in the mask are not free or if any pins
+ * are not allowed to be set to the specified mode
+ */
+int msp_gpio_mode(msp_gpio_mode_t mode, u32 mask)
+{
+ u32 allowedmask;
+
+ if ((mask & ~MSP_GPIO_FREE_MASK) != 0) {
+ printk(KERN_WARNING
+ "Invalid GPIO mask - References non-free pins\n");
+ return -EINVAL;
+ }
+
+ /* Enforce pin-mode rules */
+ allowedmask = MSP_GPIO_MODE_ALLOWED[mode];
+ if ((mask & ~allowedmask) != 0) {
+ printk(KERN_WARNING
+ "Invalid GPIO mode for masked pins\n");
+ return -EINVAL;
+ }
+
+ msp_gpio_noblink(mask);
+ msp_gpio_write_cfg(mode, mask);
+
+ return 0;
+}
+
+/*
+ * Stops the specified GPIOs from blinking
+ */
+int msp_gpio_noblink(u32 mask)
+{
+ int i;
+
+ if ((mask & ~msp_gpio_read_cfg(MSP_GPIO_OUTPUT)) != 0)
+ return -EINVAL;
+
+ spin_lock(&msp_blink_lock);
+ for (i = 0; i < MSP_NUM_GPIOS; i++) {
+ if (mask & (1 << i)) {
+ blink_table[i].count = 0;
+ blink_table[i].period = 0;
+ blink_table[i].dcycle = 0;
+ }
+ }
+ spin_unlock(&msp_blink_lock);
+
+ msp_gpio_write_data(0, mask);
+
+ return 0;
+}
+
+/*
+ * Configures GPIO(s) to blink
+ * - mask shows which GPIOs to blink
+ * - period is the time in 100ths of a second for the total period
+ * (0 disables blinking)
+ * - dcycle is the percentage of the period where the GPIO is HI
+ */
+int msp_gpio_blink(u32 mask, u32 period, u32 dcycle)
+{
+ int i;
+
+ if ((mask & ~msp_gpio_read_cfg(MSP_GPIO_OUTPUT)) != 0) {
+ printk(KERN_WARNING
+ "Invalid GPIO mask - Cannot blink non-output pins\n");
+ return -EINVAL;
+ }
+
+ if (period == 0)
+ return msp_gpio_noblink(mask);
+
+ spin_lock(&msp_blink_lock);
+ for (i = 0; i < MSP_NUM_GPIOS; i++) {
+ if (mask & (1 << i)) {
+ blink_table[i].count = 0;
+ blink_table[i].period = period;
+ blink_table[i].dcycle = dcycle;
+ }
+ }
+ spin_unlock(&msp_blink_lock);
+
+ complete(&msp_blink_wait);
+
+ return 0;
+}
+
+/* -- File functions -- */
+
+static int msp_gpio_open(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+static int msp_gpio_release(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+static int msp_gpio_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ static struct msp_gpio_ioctl_io_data data;
+ static struct msp_gpio_ioctl_blink_data blink;
+
+ switch (cmd) {
+ case MSP_GPIO_BLINK:
+ if (copy_from_user(&blink,
+ (struct msp_gpio_ioctl_blink_data *)arg, sizeof(blink)))
+ return -EFAULT;
+ break;
+ default:
+ if (copy_from_user(&data,
+ (struct msp_gpio_ioctl_io_data *)arg, sizeof(data)))
+ return -EFAULT;
+ break;
+ }
+
+ switch (cmd) {
+ case MSP_GPIO_IN:
+ if (msp_gpio_in(&data.data, data.mask))
+ return -EFAULT;
+ if (copy_to_user((struct msp_gpio_ioctl_io_data *)arg,
+ &data, sizeof(data)))
+ return -EFAULT;
+ break;
+ case MSP_GPIO_OUT:
+ if (msp_gpio_out(data.data, data.mask))
+ return -EFAULT;
+ break;
+ case MSP_GPIO_MODE:
+ if (msp_gpio_mode( data.data, data.mask))
+ return -EFAULT;
+ break;
+ case MSP_GPIO_BLINK:
+ if (msp_gpio_blink(blink.mask, blink.period, blink.dcycle))
+ return -EFAULT;
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return 0;
+}
+
+static struct file_operations msp_gpio_fops = {
+ .owner = THIS_MODULE,
+ .ioctl = msp_gpio_ioctl,
+ .open = msp_gpio_open,
+ .release = msp_gpio_release,
+};
+
+static struct miscdevice msp_gpio_miscdev = {
+ MISC_DYNAMIC_MINOR,
+ "pmcmsp_gpio",
+ &msp_gpio_fops
+};
+
+static int msp_gpio_blinkthread(void *none)
+{
+ int firstrun = 1;
+
+ do {
+ u32 mask = 0, data = 0;
+ int i, blinking = 0;
+ spin_lock(&msp_blink_lock);
+ for (i = 0; i < MSP_NUM_GPIOS; i++) {
+ /* use blink_table[i].period as 'blink enabled' test */
+ if (blink_table[i].period) {
+ blinking = 1;
+ mask |= 1 << i;
+ blink_table[i].count++;
+
+ if (blink_table[i].count >=
+ blink_table[i].period)
+ blink_table[i].count = 0;
+
+ if (blink_table[i].count <
+ (blink_table[i].period *
+ blink_table[i].dcycle / 100))
+ data |= 1 << i;
+ }
+ }
+ spin_unlock(&msp_blink_lock);
+
+ if (!firstrun || blinking)
+ msp_gpio_write_data(data, mask);
+ else
+ firstrun = 0;
+
+ if (blinking)
+ schedule_timeout_interruptible(HZ/100);
+ else
+ wait_for_completion_interruptible(&msp_blink_wait);
+
+ /* Thread may have been woken up to freeze or to exit */
+ try_to_freeze();
+ } while (!kthread_should_stop());
+
+ return 0;
+}
+
+/* -- Module functions -- */
+
+static int __init msp_gpio_init(void)
+{
+ if (misc_register(&msp_gpio_miscdev)) {
+ printk(KERN_ERR "Device registration failed\n");
+ goto err_miscdev;
+ }
+
+ msp_blinkthread = kthread_run(msp_gpio_blinkthread,NULL, "gpio_blink");
+ if (msp_blinkthread == NULL) {
+ printk(KERN_ERR "Could not start kthread\n");
+ goto err_blinkthread;
+ }
+
+ printk(KERN_WARNING "MSP7120 GPIO subsystem initialized\n");
+ return 0;
+
+err_blinkthread:
+ misc_deregister(&msp_gpio_miscdev);
+err_miscdev:
+ return -ENOMEM;
+}
+
+static void __exit msp_gpio_exit(void)
+{
+ complete(&msp_blink_wait);
+ kthread_stop(msp_blinkthread);
+
+ misc_deregister(&msp_gpio_miscdev);
+}
+
+EXPORT_SYMBOL(msp_gpio_in);
+EXPORT_SYMBOL(msp_gpio_out);
+EXPORT_SYMBOL(msp_gpio_mode);
+EXPORT_SYMBOL(msp_gpio_blink);
+EXPORT_SYMBOL(msp_gpio_noblink);
+
+MODULE_DESCRIPTION("PMC MSP GPIO driver");
+MODULE_LICENSE("GPL");
+
+module_init(msp_gpio_init);
+module_exit(msp_gpio_exit);
diff --git a/include/asm-mips/pmc-sierra/msp71xx/msp_gpio.h
b/include/asm-mips/pmc-sierra/msp71xx/msp_gpio.h
new file mode 100644
index 0000000..3c930ed
--- /dev/null
+++ b/include/asm-mips/pmc-sierra/msp71xx/msp_gpio.h
@@ -0,0 +1,98 @@
+/*
+ * Character driver for the PMC Athena (MSP7120) reference board GPIO pins
+ *
+ * Copyright 2005-2007 PMC-Sierra, 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.
+ */
+
+#ifndef __MSP_GPIO_H__
+#define __MSP_GPIO_H__
+
+#include <linux/ioctl.h>
+
+#include <msp_gpio_macros.h>
+
+/* IOCTL structs macros */
+
+struct msp_gpio_ioctl_io_data {
+ u32 data;
+ u32 mask;
+};
+
+struct msp_gpio_ioctl_blink_data {
+ u32 mask;
+ u32 period;
+ u32 dcycle;
+};
+
+#define MSP_GPIO_IOCTL_BASE 'Z'
+
+/* Reads the current data bits */
+#define MSP_GPIO_IN _IOWR(MSP_GPIO_IOCTL_BASE, 0, \
+ struct msp_gpio_ioctl_io_data)
+
+/* Writes data bits */
+#define MSP_GPIO_OUT _IOW(MSP_GPIO_IOCTL_BASE, 1, \
+ struct msp_gpio_ioctl_io_data)
+
+/* Sets all masked pins to the msp_gpio_mode_t given in the data field */
+#define MSP_GPIO_MODE _IOW(MSP_GPIO_IOCTL_BASE, 2, \
+ struct msp_gpio_ioctl_io_data)
+
+/*
+ * Starts any masked LEDs blinking with parameters as follows:
+ * - period - The time in 100ths of a second for a single period
+ * (set to '0' to stop blinking)
+ * - dcycle - The 'duty cycle' - what percentage of the period should
+ * the gpio be on?
+ */
+#define MSP_GPIO_BLINK _IOW(MSP_GPIO_IOCTL_BASE, 3, \
+ struct msp_gpio_ioctl_blink_data)
+
+/* Bit flags and masks for GPIOs */
+#define MSP_NUM_GPIOS 20
+#define MSP_GPIO_ALL_MASK ((1 << MSP_NUM_GPIOS) - 1)
+#define MSP_GPIO_NONE_MASK 0LL
+#define MSP_GPIO_FREE_MASK MSP_GPIO_ALL_MASK
+
+/* The following is only available to other modules */
+
+#ifdef __KERNEL__
+
+/* Reads the bits specified by the mask and puts the values in data */
+extern int msp_gpio_in(u32 *data, u32 mask);
+
+/* Sets the specified data on the masked pins */
+extern int msp_gpio_out(u32 data, u32 mask);
+
+/* Sets masked pins to the specified msp_gpio_mode_t */
+extern int msp_gpio_mode(msp_gpio_mode_t mode, u32 mask);
+
+/* Stops the specified GPIOs from blinking */
+extern int msp_gpio_noblink(u32 mask);
+
+/* Configures GPIO(s) to blink */
+int msp_gpio_blink(u32 mask, u32 period, u32 dcycle);
+
+#endif /* __KERNEL__ */
+
+#endif /* !__MSP_GPIO_H__ */
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