userimask.c (7e95e365d5399647a41e10059e4b09826b82d78b) userimask.c (f4e73bfcd9cca0b64cc8096175852936fb1d111f)
1/*
2 * Support for hardware-assisted userspace interrupt masking.
3 *
4 * Copyright (C) 2010 Paul Mundt
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10#define pr_fmt(fmt) "intc: " fmt
11
12#include <linux/errno.h>
1/*
2 * Support for hardware-assisted userspace interrupt masking.
3 *
4 * Copyright (C) 2010 Paul Mundt
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10#define pr_fmt(fmt) "intc: " fmt
11
12#include <linux/errno.h>
13#include <linux/sysdev.h>
13#include <linux/device.h>
14#include <linux/init.h>
15#include <linux/io.h>
16#include <linux/stat.h>
17#include <asm/sizes.h>
18#include "internals.h"
19
20static void __iomem *uimask;
21
22static ssize_t
14#include <linux/init.h>
15#include <linux/io.h>
16#include <linux/stat.h>
17#include <asm/sizes.h>
18#include "internals.h"
19
20static void __iomem *uimask;
21
22static ssize_t
23show_intc_userimask(struct sysdev_class *cls,
24 struct sysdev_class_attribute *attr, char *buf)
23show_intc_userimask(struct device *dev,
24 struct device_attribute *attr, char *buf)
25{
26 return sprintf(buf, "%d\n", (__raw_readl(uimask) >> 4) & 0xf);
27}
28
29static ssize_t
25{
26 return sprintf(buf, "%d\n", (__raw_readl(uimask) >> 4) & 0xf);
27}
28
29static ssize_t
30store_intc_userimask(struct sysdev_class *cls,
31 struct sysdev_class_attribute *attr,
30store_intc_userimask(struct device *dev,
31 struct device_attribute *attr,
32 const char *buf, size_t count)
33{
34 unsigned long level;
35
36 level = simple_strtoul(buf, NULL, 10);
37
38 /*
39 * Minimal acceptable IRQ levels are in the 2 - 16 range, but

--- 10 unchanged lines hidden (view full) ---

50 if (level >= intc_get_dfl_prio_level())
51 return -EINVAL;
52
53 __raw_writel(0xa5 << 24 | level << 4, uimask);
54
55 return count;
56}
57
32 const char *buf, size_t count)
33{
34 unsigned long level;
35
36 level = simple_strtoul(buf, NULL, 10);
37
38 /*
39 * Minimal acceptable IRQ levels are in the 2 - 16 range, but

--- 10 unchanged lines hidden (view full) ---

50 if (level >= intc_get_dfl_prio_level())
51 return -EINVAL;
52
53 __raw_writel(0xa5 << 24 | level << 4, uimask);
54
55 return count;
56}
57
58static SYSDEV_CLASS_ATTR(userimask, S_IRUSR | S_IWUSR,
59 show_intc_userimask, store_intc_userimask);
58static DEVICE_ATTR(userimask, S_IRUSR | S_IWUSR,
59 show_intc_userimask, store_intc_userimask);
60
61
62static int __init userimask_sysdev_init(void)
63{
64 if (unlikely(!uimask))
65 return -ENXIO;
66
60
61
62static int __init userimask_sysdev_init(void)
63{
64 if (unlikely(!uimask))
65 return -ENXIO;
66
67 return sysdev_class_create_file(&intc_sysdev_class, &attr_userimask);
67 return device_create_file(intc_subsys.dev_root, &dev_attr_userimask);
68}
69late_initcall(userimask_sysdev_init);
70
71int register_intc_userimask(unsigned long addr)
72{
73 if (unlikely(uimask))
74 return -EBUSY;
75
76 uimask = ioremap_nocache(addr, SZ_4K);
77 if (unlikely(!uimask))
78 return -ENOMEM;
79
80 pr_info("userimask support registered for levels 0 -> %d\n",
81 intc_get_dfl_prio_level() - 1);
82
83 return 0;
84}
68}
69late_initcall(userimask_sysdev_init);
70
71int register_intc_userimask(unsigned long addr)
72{
73 if (unlikely(uimask))
74 return -EBUSY;
75
76 uimask = ioremap_nocache(addr, SZ_4K);
77 if (unlikely(!uimask))
78 return -ENOMEM;
79
80 pr_info("userimask support registered for levels 0 -> %d\n",
81 intc_get_dfl_prio_level() - 1);
82
83 return 0;
84}