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Commit | Line | Data |
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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> | |
7e7e2f03 DM |
14 | #include <linux/of.h> |
15 | #include <linux/of_device.h> | |
f060ac54 | 16 | #include <linux/module.h> |
1da177e4 LT |
17 | |
18 | #include <asm/io.h> | |
1da177e4 LT |
19 | #include <asm/oplib.h> |
20 | #include <asm/uaccess.h> | |
21 | #include <asm/auxio.h> | |
22 | #include <asm/apc.h> | |
d472ba84 | 23 | #include <asm/processor.h> |
1da177e4 LT |
24 | |
25 | /* Debugging | |
26 | * | |
27 | * #define APC_DEBUG_LED | |
28 | */ | |
29 | ||
30 | #define APC_MINOR MISC_DYNAMIC_MINOR | |
31 | #define APC_OBPNAME "power-management" | |
32 | #define APC_DEVNAME "apc" | |
33 | ||
7e7e2f03 | 34 | static u8 __iomem *regs; |
7c9503b8 | 35 | static int apc_no_idle = 0; |
1da177e4 | 36 | |
7e7e2f03 | 37 | #define apc_readb(offs) (sbus_readb(regs+offs)) |
1da177e4 LT |
38 | #define apc_writeb(val, offs) (sbus_writeb(val, regs+offs)) |
39 | ||
40 | /* Specify "apc=noidle" on the kernel command line to | |
41 | * disable APC CPU standby support. Certain prototype | |
42 | * systems (SPARCstation-Fox) do not play well with APC | |
43 | * CPU idle, so disable this if your system has APC and | |
44 | * crashes randomly. | |
45 | */ | |
46 | static int __init apc_setup(char *str) | |
47 | { | |
48 | if(!strncmp(str, "noidle", strlen("noidle"))) { | |
49 | apc_no_idle = 1; | |
50 | return 1; | |
51 | } | |
52 | return 0; | |
53 | } | |
54 | __setup("apc=", apc_setup); | |
55 | ||
56 | /* | |
57 | * CPU idle callback function | |
58 | * See .../arch/sparc/kernel/process.c | |
59 | */ | |
c61c65cd | 60 | static void apc_swift_idle(void) |
1da177e4 LT |
61 | { |
62 | #ifdef APC_DEBUG_LED | |
63 | set_auxio(0x00, AUXIO_LED); | |
64 | #endif | |
65 | ||
66 | apc_writeb(apc_readb(APC_IDLE_REG) | APC_IDLE_ON, APC_IDLE_REG); | |
67 | ||
68 | #ifdef APC_DEBUG_LED | |
69 | set_auxio(AUXIO_LED, 0x00); | |
70 | #endif | |
71 | } | |
72 | ||
cd4cd730 | 73 | static inline void apc_free(struct platform_device *op) |
1da177e4 | 74 | { |
7e7e2f03 | 75 | of_iounmap(&op->resource[0], regs, resource_size(&op->resource[0])); |
1da177e4 LT |
76 | } |
77 | ||
78 | static int apc_open(struct inode *inode, struct file *f) | |
79 | { | |
80 | return 0; | |
81 | } | |
82 | ||
83 | static int apc_release(struct inode *inode, struct file *f) | |
84 | { | |
85 | return 0; | |
86 | } | |
87 | ||
ab772027 | 88 | static long apc_ioctl(struct file *f, unsigned int cmd, unsigned long __arg) |
1da177e4 | 89 | { |
49ab972a | 90 | __u8 inarg, __user *arg = (__u8 __user *) __arg; |
ab772027 | 91 | |
1da177e4 LT |
92 | switch (cmd) { |
93 | case APCIOCGFANCTL: | |
49ab972a | 94 | if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg)) |
ab772027 | 95 | return -EFAULT; |
1da177e4 LT |
96 | break; |
97 | ||
98 | case APCIOCGCPWR: | |
49ab972a | 99 | if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg)) |
1da177e4 LT |
100 | return -EFAULT; |
101 | break; | |
102 | ||
103 | case APCIOCGBPORT: | |
49ab972a | 104 | if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg)) |
1da177e4 LT |
105 | return -EFAULT; |
106 | break; | |
107 | ||
108 | case APCIOCSFANCTL: | |
49ab972a | 109 | if (get_user(inarg, arg)) |
1da177e4 LT |
110 | return -EFAULT; |
111 | apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG); | |
112 | break; | |
49ab972a | 113 | |
1da177e4 | 114 | case APCIOCSCPWR: |
49ab972a | 115 | if (get_user(inarg, arg)) |
1da177e4 LT |
116 | return -EFAULT; |
117 | apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG); | |
118 | break; | |
49ab972a | 119 | |
1da177e4 | 120 | case APCIOCSBPORT: |
49ab972a | 121 | if (get_user(inarg, arg)) |
1da177e4 LT |
122 | return -EFAULT; |
123 | apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG); | |
124 | break; | |
49ab972a | 125 | |
1da177e4 LT |
126 | default: |
127 | return -EINVAL; | |
6cb79b3f | 128 | } |
1da177e4 LT |
129 | |
130 | return 0; | |
131 | } | |
132 | ||
5dfe4c96 | 133 | static const struct file_operations apc_fops = { |
ab772027 SG |
134 | .unlocked_ioctl = apc_ioctl, |
135 | .open = apc_open, | |
136 | .release = apc_release, | |
6038f373 | 137 | .llseek = noop_llseek, |
1da177e4 LT |
138 | }; |
139 | ||
140 | static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops }; | |
141 | ||
7c9503b8 | 142 | static int apc_probe(struct platform_device *op) |
1da177e4 | 143 | { |
7e7e2f03 | 144 | int err; |
1da177e4 | 145 | |
7e7e2f03 DM |
146 | regs = of_ioremap(&op->resource[0], 0, |
147 | resource_size(&op->resource[0]), APC_OBPNAME); | |
148 | if (!regs) { | |
1da177e4 LT |
149 | printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME); |
150 | return -ENODEV; | |
151 | } | |
152 | ||
7e7e2f03 DM |
153 | err = misc_register(&apc_miscdev); |
154 | if (err) { | |
1da177e4 | 155 | printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME); |
7e7e2f03 | 156 | apc_free(op); |
1da177e4 LT |
157 | return -ENODEV; |
158 | } | |
159 | ||
160 | /* Assign power management IDLE handler */ | |
7e7e2f03 | 161 | if (!apc_no_idle) |
d472ba84 | 162 | sparc_idle = apc_swift_idle; |
1da177e4 LT |
163 | |
164 | printk(KERN_INFO "%s: power management initialized%s\n", | |
7e7e2f03 DM |
165 | APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : ""); |
166 | ||
1da177e4 LT |
167 | return 0; |
168 | } | |
169 | ||
505d9147 | 170 | static struct of_device_id apc_match[] = { |
7e7e2f03 DM |
171 | { |
172 | .name = APC_OBPNAME, | |
173 | }, | |
174 | {}, | |
175 | }; | |
176 | MODULE_DEVICE_TABLE(of, apc_match); | |
177 | ||
4ebb24f7 | 178 | static struct platform_driver apc_driver = { |
4018294b GL |
179 | .driver = { |
180 | .name = "apc", | |
4018294b GL |
181 | .of_match_table = apc_match, |
182 | }, | |
7e7e2f03 DM |
183 | .probe = apc_probe, |
184 | }; | |
185 | ||
186 | static int __init apc_init(void) | |
187 | { | |
4ebb24f7 | 188 | return platform_driver_register(&apc_driver); |
7e7e2f03 DM |
189 | } |
190 | ||
1da177e4 LT |
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 | */ | |
7e7e2f03 | 195 | __initcall(apc_init); |