1 files changed, 83 insertions, 0 deletions

diff --git a/drivers/sh/intc/userimask.c b/drivers/sh/intc/userimask.c
new file mode 100644
index 000000000000..e32304b66cf1
--- /dev/null
+++ b/drivers/sh/intc/userimask.c
@@ -0,0 +1,83 @@
+/*
+ * Support for hardware-assisted userspace interrupt masking.
+ *
+ * Copyright (C) 2010  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#define pr_fmt(fmt) "intc: " fmt
+
+#include <linux/errno.h>
+#include <linux/sysdev.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <asm/sizes.h>
+#include "internals.h"
+
+static void __iomem *uimask;
+
+static ssize_t
+show_intc_userimask(struct sysdev_class *cls,
+                    struct sysdev_class_attribute *attr, char *buf)
+{
+        return sprintf(buf, "%d\n", (__raw_readl(uimask) >> 4) & 0xf);
+}
+
+static ssize_t
+store_intc_userimask(struct sysdev_class *cls,
+                     struct sysdev_class_attribute *attr,
+                     const char *buf, size_t count)
+{
+        unsigned long level;
+
+        level = simple_strtoul(buf, NULL, 10);
+
+        /*
+         * Minimal acceptable IRQ levels are in the 2 - 16 range, but
+         * these are chomped so as to not interfere with normal IRQs.
+         *
+         * Level 1 is a special case on some CPUs in that it's not
+         * directly settable, but given that USERIMASK cuts off below a
+         * certain level, we don't care about this limitation here.
+         * Level 0 on the other hand equates to user masking disabled.
+         *
+         * We use the default priority level as a cut off so that only
+         * special case opt-in IRQs can be mangled.
+         */
+        if (level >= intc_get_dfl_prio_level())
+                return -EINVAL;
+
+        __raw_writel(0xa5 << 24 | level << 4, uimask);
+
+        return count;
+}
+
+static SYSDEV_CLASS_ATTR(userimask, S_IRUSR | S_IWUSR,
+                         show_intc_userimask, store_intc_userimask);
+
+
+static int __init userimask_sysdev_init(void)
+{
+        if (unlikely(!uimask))
+                return -ENXIO;
+
+        return sysdev_class_create_file(&intc_sysdev_class, &attr_userimask);
+}
+late_initcall(userimask_sysdev_init);
+
+int register_intc_userimask(unsigned long addr)
+{
+        if (unlikely(uimask))
+                return -EBUSY;
+
+        uimask = ioremap_nocache(addr, SZ_4K);
+        if (unlikely(!uimask))
+                return -ENOMEM;
+
+        pr_info("userimask support registered for levels 0 -> %d\n",
+                intc_get_dfl_prio_level() - 1);
+
+        return 0;
+}