1 files changed, 289 insertions, 0 deletions
diff --git a/drivers/staging/fsl_qbman/fsl_usdpaa_irq.c b/drivers/staging/fsl_qbman/fsl_usdpaa_irq.c
new file mode 100644
index 0000000..914c7471
--- /dev/null
+++ b/drivers/staging/fsl_qbman/fsl_usdpaa_irq.c
@@ -0,0 +1,289 @@
+/* Copyright (c) 2013 Freescale Semiconductor, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *	 notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *	 notice, this list of conditions and the following disclaimer in the
+ *	 documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Freescale Semiconductor nor the
+ *	 names of its contributors may be used to endorse or promote products
+ *	 derived from this software without specific prior written permission.
+ *
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``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 Freescale Semiconductor 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.
+ */
+
+/* define a device that allows USPDAA processes to open a file
+   descriptor and specify which IRQ it wants to montior using an ioctl()
+   When an IRQ is received, the device becomes readable so that a process
+   can use read() or select() type calls to monitor for IRQs */
+
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/poll.h>
+#include <linux/uaccess.h>
+#include <linux/fsl_usdpaa.h>
+#include <linux/module.h>
+#include <linux/fdtable.h>
+#include <linux/file.h>
+
+#include "qman_low.h"
+#include "bman_low.h"
+
+struct usdpaa_irq_ctx {
+	int irq_set; /* Set to true once the irq is set via ioctl */
+	unsigned int irq_num;
+	u32 last_irq_count; /* Last value returned from read */
+	u32 irq_count; /* Number of irqs since last read */
+	wait_queue_head_t wait_queue; /* Waiting processes */
+	spinlock_t lock;
+	void *inhibit_addr; /* inhibit register address */
+	struct file *usdpaa_filp;
+	char irq_name[128];
+};
+
+static int usdpaa_irq_open(struct inode *inode, struct file *filp)
+{
+	struct usdpaa_irq_ctx *ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+	ctx->irq_set = 0;
+	ctx->irq_count = 0;
+	ctx->last_irq_count = 0;
+	init_waitqueue_head(&ctx->wait_queue);
+	spin_lock_init(&ctx->lock);
+	filp->private_data = ctx;
+	return 0;
+}
+
+static int usdpaa_irq_release(struct inode *inode, struct file *filp)
+{
+	struct usdpaa_irq_ctx *ctx = filp->private_data;
+	if (ctx->irq_set) {
+		/* Inhibit the IRQ */
+		out_be32(ctx->inhibit_addr, 0x1);
+		irq_set_affinity_hint(ctx->irq_num, NULL);
+		free_irq(ctx->irq_num, ctx);
+		ctx->irq_set = 0;
+		fput(ctx->usdpaa_filp);
+	}
+	kfree(filp->private_data);
+	return 0;
+}
+
+static irqreturn_t usdpaa_irq_handler(int irq, void *_ctx)
+{
+	unsigned long flags;
+	struct usdpaa_irq_ctx *ctx = _ctx;
+	spin_lock_irqsave(&ctx->lock, flags);
+	++ctx->irq_count;
+	spin_unlock_irqrestore(&ctx->lock, flags);
+	wake_up_all(&ctx->wait_queue);
+	/* Set the inhibit register.  This will be reenabled
+	   once the USDPAA code handles the IRQ */
+	out_be32(ctx->inhibit_addr, 0x1);
+	pr_info("Inhibit at %p count %d", ctx->inhibit_addr, ctx->irq_count);
+	return IRQ_HANDLED;
+}
+
+static int map_irq(struct file *fp, struct usdpaa_ioctl_irq_map *irq_map)
+{
+	struct usdpaa_irq_ctx *ctx = fp->private_data;
+	int ret;
+
+	if (ctx->irq_set) {
+		pr_debug("Setting USDPAA IRQ when it was already set!\n");
+		return -EBUSY;
+	}
+
+	ctx->usdpaa_filp = fget(irq_map->fd);
+	if (!ctx->usdpaa_filp) {
+		pr_debug("USDPAA fget(%d) returned NULL\n", irq_map->fd);
+		return -EINVAL;
+	}
+
+	ret = usdpaa_get_portal_config(ctx->usdpaa_filp, irq_map->portal_cinh,
+				       irq_map->type, &ctx->irq_num,
+				       &ctx->inhibit_addr);
+	if (ret) {
+		pr_debug("USDPAA IRQ couldn't identify portal\n");
+		fput(ctx->usdpaa_filp);
+		return ret;
+	}
+
+	ctx->irq_set = 1;
+
+	snprintf(ctx->irq_name, sizeof(ctx->irq_name),
+		 "usdpaa_irq %d", ctx->irq_num);
+
+	ret = request_irq(ctx->irq_num, usdpaa_irq_handler, 0,
+			  ctx->irq_name, ctx);
+	if (ret) {
+		pr_err("USDPAA request_irq(%d) failed, ret= %d\n",
+		       ctx->irq_num, ret);
+		ctx->irq_set = 0;
+		fput(ctx->usdpaa_filp);
+		return ret;
+	}
+	ret = irq_set_affinity(ctx->irq_num, &current->cpus_allowed);
+	if (ret)
+		pr_err("USDPAA irq_set_affinity() failed, ret= %d\n", ret);
+
+	ret = irq_set_affinity_hint(ctx->irq_num, &current->cpus_allowed);
+	if (ret)
+		pr_err("USDPAA irq_set_affinity_hint() failed, ret= %d\n", ret);
+
+	return 0;
+}
+
+static long usdpaa_irq_ioctl(struct file *fp, unsigned int cmd,
+			     unsigned long arg)
+{
+	int ret;
+	struct usdpaa_ioctl_irq_map irq_map;
+
+	if (cmd != USDPAA_IOCTL_PORTAL_IRQ_MAP) {
+		pr_debug("USDPAA IRQ unknown command 0x%x\n", cmd);
+		return -EINVAL;
+	}
+
+	ret = copy_from_user(&irq_map, (void __user *)arg,
+			     sizeof(irq_map));
+	if (ret)
+		return ret;
+	return map_irq(fp, &irq_map);
+}
+
+static ssize_t usdpaa_irq_read(struct file *filp, char __user *buff,
+			       size_t count, loff_t *offp)
+{
+	struct usdpaa_irq_ctx *ctx = filp->private_data;
+	int ret;
+
+	if (!ctx->irq_set) {
+		pr_debug("Reading USDPAA IRQ before it was set\n");
+		return -EINVAL;
+	}
+
+	if (count < sizeof(ctx->irq_count)) {
+		pr_debug("USDPAA IRQ Read too small\n");
+		return -EINVAL;
+	}
+	if (ctx->irq_count == ctx->last_irq_count) {
+		if (filp->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+
+		ret = wait_event_interruptible(ctx->wait_queue,
+				       ctx->irq_count != ctx->last_irq_count);
+		if (ret == -ERESTARTSYS)
+			return ret;
+	}
+
+	ctx->last_irq_count = ctx->irq_count;
+
+	if (copy_to_user(buff, &ctx->last_irq_count,
+			 sizeof(ctx->last_irq_count)))
+		return -EFAULT;
+	return sizeof(ctx->irq_count);
+}
+
+static unsigned int usdpaa_irq_poll(struct file *filp, poll_table *wait)
+{
+	struct usdpaa_irq_ctx *ctx = filp->private_data;
+	unsigned int ret = 0;
+	unsigned long flags;
+
+	if (!ctx->irq_set)
+		return POLLHUP;
+
+	poll_wait(filp, &ctx->wait_queue, wait);
+
+	spin_lock_irqsave(&ctx->lock, flags);
+	if (ctx->irq_count != ctx->last_irq_count)
+		ret |= POLLIN | POLLRDNORM;
+	spin_unlock_irqrestore(&ctx->lock, flags);
+	return ret;
+}
+
+static long usdpaa_irq_ioctl_compat(struct file *fp, unsigned int cmd,
+				unsigned long arg)
+{
+#ifdef CONFIG_COMPAT
+	void __user *a = (void __user *)arg;
+#endif
+	switch (cmd) {
+#ifdef CONFIG_COMPAT
+	case  USDPAA_IOCTL_PORTAL_IRQ_MAP_COMPAT:
+	{
+		struct compat_ioctl_irq_map input;
+		struct usdpaa_ioctl_irq_map converted;
+		if (copy_from_user(&input, a, sizeof(input)))
+			return -EFAULT;
+		converted.type = input.type;
+		converted.fd = input.fd;
+		converted.portal_cinh = compat_ptr(input.portal_cinh);
+		return map_irq(fp, &converted);
+	}
+#endif
+	default:
+		return usdpaa_irq_ioctl(fp, cmd, arg);
+	}
+}
+
+static const struct file_operations usdpaa_irq_fops = {
+	.open		   = usdpaa_irq_open,
+	.release	   = usdpaa_irq_release,
+	.unlocked_ioctl	   = usdpaa_irq_ioctl,
+	.compat_ioctl	   = usdpaa_irq_ioctl_compat,
+	.read              = usdpaa_irq_read,
+	.poll              = usdpaa_irq_poll
+};
+
+static struct miscdevice usdpaa_miscdev = {
+	.name = "fsl-usdpaa-irq",
+	.fops = &usdpaa_irq_fops,
+	.minor = MISC_DYNAMIC_MINOR,
+};
+
+static int __init usdpaa_irq_init(void)
+{
+	int ret;
+
+	pr_info("Freescale USDPAA process IRQ driver\n");
+	ret = misc_register(&usdpaa_miscdev);
+	if (ret)
+		pr_err("fsl-usdpaa-irq: failed to register misc device\n");
+	return ret;
+}
+
+static void __exit usdpaa_irq_exit(void)
+{
+	misc_deregister(&usdpaa_miscdev);
+}
+
+module_init(usdpaa_irq_init);
+module_exit(usdpaa_irq_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Freescale Semiconductor");
+MODULE_DESCRIPTION("Freescale USDPAA process IRQ driver");