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8#include <linux/kernel.h>
9#include <linux/fs.h>
10#include <linux/errno.h>
11#include <linux/init.h>
12#include <linux/miscdevice.h>
13#include <linux/smp_lock.h>
14#include <linux/pm.h>
15#include <linux/of.h>
16#include <linux/of_device.h>
17
18#include <asm/io.h>
19#include <asm/oplib.h>
20#include <asm/uaccess.h>
21#include <asm/auxio.h>
22#include <asm/apc.h>
23
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25
26
27
28
29#define APC_MINOR MISC_DYNAMIC_MINOR
30#define APC_OBPNAME "power-management"
31#define APC_DEVNAME "apc"
32
33static u8 __iomem *regs;
34static int apc_no_idle __devinitdata = 0;
35
36#define apc_readb(offs) (sbus_readb(regs+offs))
37#define apc_writeb(val, offs) (sbus_writeb(val, regs+offs))
38
39
40
41
42
43
44
45static int __init apc_setup(char *str)
46{
47 if(!strncmp(str, "noidle", strlen("noidle"))) {
48 apc_no_idle = 1;
49 return 1;
50 }
51 return 0;
52}
53__setup("apc=", apc_setup);
54
55
56
57
58
59static void apc_swift_idle(void)
60{
61#ifdef APC_DEBUG_LED
62 set_auxio(0x00, AUXIO_LED);
63#endif
64
65 apc_writeb(apc_readb(APC_IDLE_REG) | APC_IDLE_ON, APC_IDLE_REG);
66
67#ifdef APC_DEBUG_LED
68 set_auxio(AUXIO_LED, 0x00);
69#endif
70}
71
72static inline void apc_free(struct of_device *op)
73{
74 of_iounmap(&op->resource[0], regs, resource_size(&op->resource[0]));
75}
76
77static int apc_open(struct inode *inode, struct file *f)
78{
79 cycle_kernel_lock();
80 return 0;
81}
82
83static int apc_release(struct inode *inode, struct file *f)
84{
85 return 0;
86}
87
88static long apc_ioctl(struct file *f, unsigned int cmd, unsigned long __arg)
89{
90 __u8 inarg, __user *arg;
91
92 arg = (__u8 __user *) __arg;
93
94 lock_kernel();
95
96 switch (cmd) {
97 case APCIOCGFANCTL:
98 if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg)) {
99 unlock_kernel();
100 return -EFAULT;
101 }
102 break;
103
104 case APCIOCGCPWR:
105 if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg)) {
106 unlock_kernel();
107 return -EFAULT;
108 }
109 break;
110
111 case APCIOCGBPORT:
112 if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg)) {
113 unlock_kernel();
114 return -EFAULT;
115 }
116 break;
117
118 case APCIOCSFANCTL:
119 if (get_user(inarg, arg)) {
120 unlock_kernel();
121 return -EFAULT;
122 }
123 apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG);
124 break;
125 case APCIOCSCPWR:
126 if (get_user(inarg, arg)) {
127 unlock_kernel();
128 return -EFAULT;
129 }
130 apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG);
131 break;
132 case APCIOCSBPORT:
133 if (get_user(inarg, arg)) {
134 unlock_kernel();
135 return -EFAULT;
136 }
137 apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG);
138 break;
139 default:
140 unlock_kernel();
141 return -EINVAL;
142 };
143
144 unlock_kernel();
145 return 0;
146}
147
148static const struct file_operations apc_fops = {
149 .unlocked_ioctl = apc_ioctl,
150 .open = apc_open,
151 .release = apc_release,
152};
153
154static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops };
155
156static int __devinit apc_probe(struct of_device *op,
157 const struct of_device_id *match)
158{
159 int err;
160
161 regs = of_ioremap(&op->resource[0], 0,
162 resource_size(&op->resource[0]), APC_OBPNAME);
163 if (!regs) {
164 printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME);
165 return -ENODEV;
166 }
167
168 err = misc_register(&apc_miscdev);
169 if (err) {
170 printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME);
171 apc_free(op);
172 return -ENODEV;
173 }
174
175
176 if (!apc_no_idle)
177 pm_idle = apc_swift_idle;
178
179 printk(KERN_INFO "%s: power management initialized%s\n",
180 APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : "");
181
182 return 0;
183}
184
185static struct of_device_id __initdata apc_match[] = {
186 {
187 .name = APC_OBPNAME,
188 },
189 {},
190};
191MODULE_DEVICE_TABLE(of, apc_match);
192
193static struct of_platform_driver apc_driver = {
194 .name = "apc",
195 .match_table = apc_match,
196 .probe = apc_probe,
197};
198
199static int __init apc_init(void)
200{
201 return of_register_driver(&apc_driver, &of_bus_type);
202}
203
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206
207
208__initcall(apc_init);
209
