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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 | #include <linux/of.h> |
15 | #include <linux/of_device.h> |
16 | |
17 | #include <asm/io.h> |
18 | #include <asm/oplib.h> |
19 | #include <asm/uaccess.h> |
20 | #include <asm/auxio.h> |
21 | #include <asm/apc.h> |
22 | |
23 | /* Debugging |
24 | * |
25 | * #define APC_DEBUG_LED |
26 | */ |
27 | |
28 | #define APC_MINOR MISC_DYNAMIC_MINOR |
29 | #define APC_OBPNAME "power-management" |
30 | #define APC_DEVNAME "apc" |
31 | |
32 | static u8 __iomem *regs; |
33 | static int apc_no_idle __devinitdata = 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 | static 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(struct platform_device *op) |
72 | { |
73 | of_iounmap(&op->resource[0], regs, resource_size(&op->resource[0])); |
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 long apc_ioctl(struct file *f, unsigned int cmd, unsigned long __arg) |
87 | { |
88 | __u8 inarg, __user *arg = (__u8 __user *) __arg; |
89 | |
90 | switch (cmd) { |
91 | case APCIOCGFANCTL: |
92 | if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg)) |
93 | return -EFAULT; |
94 | break; |
95 | |
96 | case APCIOCGCPWR: |
97 | if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg)) |
98 | return -EFAULT; |
99 | break; |
100 | |
101 | case APCIOCGBPORT: |
102 | if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg)) |
103 | return -EFAULT; |
104 | break; |
105 | |
106 | case APCIOCSFANCTL: |
107 | if (get_user(inarg, arg)) |
108 | return -EFAULT; |
109 | apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG); |
110 | break; |
111 | |
112 | case APCIOCSCPWR: |
113 | if (get_user(inarg, arg)) |
114 | return -EFAULT; |
115 | apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG); |
116 | break; |
117 | |
118 | case APCIOCSBPORT: |
119 | if (get_user(inarg, arg)) |
120 | return -EFAULT; |
121 | apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG); |
122 | break; |
123 | |
124 | default: |
125 | return -EINVAL; |
126 | }; |
127 | |
128 | return 0; |
129 | } |
130 | |
131 | static const struct file_operations apc_fops = { |
132 | .unlocked_ioctl = apc_ioctl, |
133 | .open = apc_open, |
134 | .release = apc_release, |
135 | .llseek = noop_llseek, |
136 | }; |
137 | |
138 | static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops }; |
139 | |
140 | static int __devinit apc_probe(struct platform_device *op, |
141 | const struct of_device_id *match) |
142 | { |
143 | int err; |
144 | |
145 | regs = of_ioremap(&op->resource[0], 0, |
146 | resource_size(&op->resource[0]), APC_OBPNAME); |
147 | if (!regs) { |
148 | printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME); |
149 | return -ENODEV; |
150 | } |
151 | |
152 | err = misc_register(&apc_miscdev); |
153 | if (err) { |
154 | printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME); |
155 | apc_free(op); |
156 | return -ENODEV; |
157 | } |
158 | |
159 | /* Assign power management IDLE handler */ |
160 | if (!apc_no_idle) |
161 | pm_idle = apc_swift_idle; |
162 | |
163 | printk(KERN_INFO "%s: power management initialized%s\n", |
164 | APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : ""); |
165 | |
166 | return 0; |
167 | } |
168 | |
169 | static struct of_device_id __initdata apc_match[] = { |
170 | { |
171 | .name = APC_OBPNAME, |
172 | }, |
173 | {}, |
174 | }; |
175 | MODULE_DEVICE_TABLE(of, apc_match); |
176 | |
177 | static struct of_platform_driver apc_driver = { |
178 | .driver = { |
179 | .name = "apc", |
180 | .owner = THIS_MODULE, |
181 | .of_match_table = apc_match, |
182 | }, |
183 | .probe = apc_probe, |
184 | }; |
185 | |
186 | static int __init apc_init(void) |
187 | { |
188 | return of_register_platform_driver(&apc_driver); |
189 | } |
190 | |
191 | /* This driver is not critical to the boot process |
192 | * and is easiest to ioremap when SBus is already |
193 | * initialized, so we install ourselves thusly: |
194 | */ |
195 | __initcall(apc_init); |
196 |
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