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1da177e4 LT |
1 | /* apc - Driver implementation for power management functions |
2 | * of Aurora Personality Chip (APC) on SPARCstation-4/5 and | |
3 | * derivatives. | |
4 | * | |
5 | * Copyright (c) 2002 Eric Brower (ebrower@usa.net) | |
6 | */ | |
7 | ||
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/pm.h> | |
14 | ||
15 | #include <asm/io.h> | |
16 | #include <asm/sbus.h> | |
17 | #include <asm/oplib.h> | |
18 | #include <asm/uaccess.h> | |
19 | #include <asm/auxio.h> | |
20 | #include <asm/apc.h> | |
21 | ||
22 | /* Debugging | |
23 | * | |
24 | * #define APC_DEBUG_LED | |
25 | */ | |
26 | ||
27 | #define APC_MINOR MISC_DYNAMIC_MINOR | |
28 | #define APC_OBPNAME "power-management" | |
29 | #define APC_DEVNAME "apc" | |
30 | ||
31 | volatile static u8 __iomem *regs; | |
32 | static int apc_regsize; | |
33 | static int apc_no_idle __initdata = 0; | |
34 | ||
35 | #define apc_readb(offs) (sbus_readb(regs+offs)) | |
36 | #define apc_writeb(val, offs) (sbus_writeb(val, regs+offs)) | |
37 | ||
38 | /* Specify "apc=noidle" on the kernel command line to | |
39 | * disable APC CPU standby support. Certain prototype | |
40 | * systems (SPARCstation-Fox) do not play well with APC | |
41 | * CPU idle, so disable this if your system has APC and | |
42 | * crashes randomly. | |
43 | */ | |
44 | static int __init apc_setup(char *str) | |
45 | { | |
46 | if(!strncmp(str, "noidle", strlen("noidle"))) { | |
47 | apc_no_idle = 1; | |
48 | return 1; | |
49 | } | |
50 | return 0; | |
51 | } | |
52 | __setup("apc=", apc_setup); | |
53 | ||
54 | /* | |
55 | * CPU idle callback function | |
56 | * See .../arch/sparc/kernel/process.c | |
57 | */ | |
58 | void apc_swift_idle(void) | |
59 | { | |
60 | #ifdef APC_DEBUG_LED | |
61 | set_auxio(0x00, AUXIO_LED); | |
62 | #endif | |
63 | ||
64 | apc_writeb(apc_readb(APC_IDLE_REG) | APC_IDLE_ON, APC_IDLE_REG); | |
65 | ||
66 | #ifdef APC_DEBUG_LED | |
67 | set_auxio(AUXIO_LED, 0x00); | |
68 | #endif | |
69 | } | |
70 | ||
71 | static inline void apc_free(void) | |
72 | { | |
73 | sbus_iounmap(regs, apc_regsize); | |
74 | } | |
75 | ||
76 | static int apc_open(struct inode *inode, struct file *f) | |
77 | { | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static int apc_release(struct inode *inode, struct file *f) | |
82 | { | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static int apc_ioctl(struct inode *inode, struct file *f, | |
87 | unsigned int cmd, unsigned long __arg) | |
88 | { | |
89 | __u8 inarg, __user *arg; | |
90 | ||
91 | arg = (__u8 __user *) __arg; | |
92 | switch (cmd) { | |
93 | case APCIOCGFANCTL: | |
94 | if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg)) | |
95 | return -EFAULT; | |
96 | break; | |
97 | ||
98 | case APCIOCGCPWR: | |
99 | if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg)) | |
100 | return -EFAULT; | |
101 | break; | |
102 | ||
103 | case APCIOCGBPORT: | |
104 | if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg)) | |
105 | return -EFAULT; | |
106 | break; | |
107 | ||
108 | case APCIOCSFANCTL: | |
109 | if (get_user(inarg, arg)) | |
110 | return -EFAULT; | |
111 | apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG); | |
112 | break; | |
113 | case APCIOCSCPWR: | |
114 | if (get_user(inarg, arg)) | |
115 | return -EFAULT; | |
116 | apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG); | |
117 | break; | |
118 | case APCIOCSBPORT: | |
119 | if (get_user(inarg, arg)) | |
120 | return -EFAULT; | |
121 | apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG); | |
122 | break; | |
123 | default: | |
124 | return -EINVAL; | |
125 | }; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static struct file_operations apc_fops = { | |
131 | .ioctl = apc_ioctl, | |
132 | .open = apc_open, | |
133 | .release = apc_release, | |
134 | }; | |
135 | ||
136 | static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops }; | |
137 | ||
138 | static int __init apc_probe(void) | |
139 | { | |
140 | struct sbus_bus *sbus = NULL; | |
141 | struct sbus_dev *sdev = NULL; | |
142 | int iTmp = 0; | |
143 | ||
144 | for_each_sbus(sbus) { | |
145 | for_each_sbusdev(sdev, sbus) { | |
146 | if (!strcmp(sdev->prom_name, APC_OBPNAME)) { | |
147 | goto sbus_done; | |
148 | } | |
149 | } | |
150 | } | |
151 | ||
152 | sbus_done: | |
153 | if (!sdev) { | |
154 | return -ENODEV; | |
155 | } | |
156 | ||
157 | apc_regsize = sdev->reg_addrs[0].reg_size; | |
158 | regs = sbus_ioremap(&sdev->resource[0], 0, | |
159 | apc_regsize, APC_OBPNAME); | |
160 | if(!regs) { | |
161 | printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME); | |
162 | return -ENODEV; | |
163 | } | |
164 | ||
165 | iTmp = misc_register(&apc_miscdev); | |
166 | if (iTmp != 0) { | |
167 | printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME); | |
168 | apc_free(); | |
169 | return -ENODEV; | |
170 | } | |
171 | ||
172 | /* Assign power management IDLE handler */ | |
173 | if(!apc_no_idle) | |
174 | pm_idle = apc_swift_idle; | |
175 | ||
176 | printk(KERN_INFO "%s: power management initialized%s\n", | |
177 | APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : ""); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | /* This driver is not critical to the boot process | |
182 | * and is easiest to ioremap when SBus is already | |
183 | * initialized, so we install ourselves thusly: | |
184 | */ | |
185 | __initcall(apc_probe); | |
186 |