aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/misc/hdpuftrs/hdpu_cpustate.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/misc/hdpuftrs/hdpu_cpustate.c')
-rw-r--r--drivers/misc/hdpuftrs/hdpu_cpustate.c256
1 files changed, 0 insertions, 256 deletions
diff --git a/drivers/misc/hdpuftrs/hdpu_cpustate.c b/drivers/misc/hdpuftrs/hdpu_cpustate.c
deleted file mode 100644
index 176fe4e09d3f..000000000000
--- a/drivers/misc/hdpuftrs/hdpu_cpustate.c
+++ /dev/null
@@ -1,256 +0,0 @@
1/*
2 * Sky CPU State Driver
3 *
4 * Copyright (C) 2002 Brian Waite
5 *
6 * This driver allows use of the CPU state bits
7 * It exports the /dev/sky_cpustate and also
8 * /proc/sky_cpustate pseudo-file for status information.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 */
16
17#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/spinlock.h>
20#include <linux/smp_lock.h>
21#include <linux/miscdevice.h>
22#include <linux/proc_fs.h>
23#include <linux/hdpu_features.h>
24#include <linux/platform_device.h>
25#include <asm/uaccess.h>
26#include <linux/seq_file.h>
27#include <asm/io.h>
28
29#define SKY_CPUSTATE_VERSION "1.1"
30
31static int hdpu_cpustate_probe(struct platform_device *pdev);
32static int hdpu_cpustate_remove(struct platform_device *pdev);
33
34static unsigned char cpustate_get_state(void);
35static int cpustate_proc_open(struct inode *inode, struct file *file);
36static int cpustate_proc_read(struct seq_file *seq, void *offset);
37
38static struct cpustate_t cpustate;
39
40static const struct file_operations proc_cpustate = {
41 .open = cpustate_proc_open,
42 .read = seq_read,
43 .llseek = seq_lseek,
44 .release = single_release,
45 .owner = THIS_MODULE,
46};
47
48static int cpustate_proc_open(struct inode *inode, struct file *file)
49{
50 return single_open(file, cpustate_proc_read, NULL);
51}
52
53static int cpustate_proc_read(struct seq_file *seq, void *offset)
54{
55 seq_printf(seq, "CPU State: %04x\n", cpustate_get_state());
56 return 0;
57}
58
59static int cpustate_get_ref(int excl)
60{
61
62 int retval = -EBUSY;
63
64 spin_lock(&cpustate.lock);
65
66 if (cpustate.excl)
67 goto out_busy;
68
69 if (excl) {
70 if (cpustate.open_count)
71 goto out_busy;
72 cpustate.excl = 1;
73 }
74
75 cpustate.open_count++;
76 retval = 0;
77
78 out_busy:
79 spin_unlock(&cpustate.lock);
80 return retval;
81}
82
83static int cpustate_free_ref(void)
84{
85
86 spin_lock(&cpustate.lock);
87
88 cpustate.excl = 0;
89 cpustate.open_count--;
90
91 spin_unlock(&cpustate.lock);
92 return 0;
93}
94
95static unsigned char cpustate_get_state(void)
96{
97
98 return cpustate.cached_val;
99}
100
101static void cpustate_set_state(unsigned char new_state)
102{
103 unsigned int state = (new_state << 21);
104
105#ifdef DEBUG_CPUSTATE
106 printk("CPUSTATE -> 0x%x\n", new_state);
107#endif
108 spin_lock(&cpustate.lock);
109 cpustate.cached_val = new_state;
110 writel((0xff << 21), cpustate.clr_addr);
111 writel(state, cpustate.set_addr);
112 spin_unlock(&cpustate.lock);
113}
114
115/*
116 * Now all the various file operations that we export.
117 */
118
119static ssize_t cpustate_read(struct file *file, char *buf,
120 size_t count, loff_t * ppos)
121{
122 unsigned char data;
123
124 if (count < 0)
125 return -EFAULT;
126 if (count == 0)
127 return 0;
128
129 data = cpustate_get_state();
130 if (copy_to_user(buf, &data, sizeof(unsigned char)))
131 return -EFAULT;
132 return sizeof(unsigned char);
133}
134
135static ssize_t cpustate_write(struct file *file, const char *buf,
136 size_t count, loff_t * ppos)
137{
138 unsigned char data;
139
140 if (count < 0)
141 return -EFAULT;
142
143 if (count == 0)
144 return 0;
145
146 if (copy_from_user((unsigned char *)&data, buf, sizeof(unsigned char)))
147 return -EFAULT;
148
149 cpustate_set_state(data);
150 return sizeof(unsigned char);
151}
152
153static int cpustate_open(struct inode *inode, struct file *file)
154{
155 int ret;
156
157 lock_kernel();
158 ret = cpustate_get_ref((file->f_flags & O_EXCL));
159 unlock_kernel();
160
161 return ret;
162}
163
164static int cpustate_release(struct inode *inode, struct file *file)
165{
166 return cpustate_free_ref();
167}
168
169static struct platform_driver hdpu_cpustate_driver = {
170 .probe = hdpu_cpustate_probe,
171 .remove = hdpu_cpustate_remove,
172 .driver = {
173 .name = HDPU_CPUSTATE_NAME,
174 .owner = THIS_MODULE,
175 },
176};
177
178/*
179 * The various file operations we support.
180 */
181static const struct file_operations cpustate_fops = {
182 .owner = THIS_MODULE,
183 .open = cpustate_open,
184 .release = cpustate_release,
185 .read = cpustate_read,
186 .write = cpustate_write,
187 .llseek = no_llseek,
188};
189
190static struct miscdevice cpustate_dev = {
191 .minor = MISC_DYNAMIC_MINOR,
192 .name = "sky_cpustate",
193 .fops = &cpustate_fops,
194};
195
196static int hdpu_cpustate_probe(struct platform_device *pdev)
197{
198 struct resource *res;
199 struct proc_dir_entry *proc_de;
200 int ret;
201
202 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
203 if (!res) {
204 printk(KERN_ERR "sky_cpustate: "
205 "Invalid memory resource.\n");
206 return -EINVAL;
207 }
208 cpustate.set_addr = (unsigned long *)res->start;
209 cpustate.clr_addr = (unsigned long *)res->end - 1;
210
211 ret = misc_register(&cpustate_dev);
212 if (ret) {
213 printk(KERN_WARNING "sky_cpustate: "
214 "Unable to register misc device.\n");
215 cpustate.set_addr = NULL;
216 cpustate.clr_addr = NULL;
217 return ret;
218 }
219
220 proc_de = proc_create("sky_cpustate", 0666, NULL, &proc_cpustate);
221 if (!proc_de) {
222 printk(KERN_WARNING "sky_cpustate: "
223 "Unable to create proc entry\n");
224 }
225
226 printk(KERN_INFO "Sky CPU State Driver v" SKY_CPUSTATE_VERSION "\n");
227 return 0;
228}
229
230static int hdpu_cpustate_remove(struct platform_device *pdev)
231{
232 cpustate.set_addr = NULL;
233 cpustate.clr_addr = NULL;
234
235 remove_proc_entry("sky_cpustate", NULL);
236 misc_deregister(&cpustate_dev);
237
238 return 0;
239}
240
241static int __init cpustate_init(void)
242{
243 return platform_driver_register(&hdpu_cpustate_driver);
244}
245
246static void __exit cpustate_exit(void)
247{
248 platform_driver_unregister(&hdpu_cpustate_driver);
249}
250
251module_init(cpustate_init);
252module_exit(cpustate_exit);
253
254MODULE_AUTHOR("Brian Waite");
255MODULE_LICENSE("GPL");
256MODULE_ALIAS("platform:" HDPU_CPUSTATE_NAME);
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-11 02:26:41 -0500