Commit | Line | Data |
---|---|---|
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> | |
ee30d64e | 13 | #include <linux/smp_lock.h> |
1da177e4 | 14 | #include <linux/pm.h> |
7e7e2f03 DM |
15 | #include <linux/of.h> |
16 | #include <linux/of_device.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> | |
23 | ||
24 | /* Debugging | |
25 | * | |
26 | * #define APC_DEBUG_LED | |
27 | */ | |
28 | ||
29 | #define APC_MINOR MISC_DYNAMIC_MINOR | |
30 | #define APC_OBPNAME "power-management" | |
31 | #define APC_DEVNAME "apc" | |
32 | ||
7e7e2f03 | 33 | static u8 __iomem *regs; |
a1731e5b | 34 | static int apc_no_idle __devinitdata = 0; |
1da177e4 | 35 | |
7e7e2f03 | 36 | #define apc_readb(offs) (sbus_readb(regs+offs)) |
1da177e4 LT |
37 | #define apc_writeb(val, offs) (sbus_writeb(val, regs+offs)) |
38 | ||
39 | /* Specify "apc=noidle" on the kernel command line to | |
40 | * disable APC CPU standby support. Certain prototype | |
41 | * systems (SPARCstation-Fox) do not play well with APC | |
42 | * CPU idle, so disable this if your system has APC and | |
43 | * crashes randomly. | |
44 | */ | |
45 | static 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 | * CPU idle callback function | |
57 | * See .../arch/sparc/kernel/process.c | |
58 | */ | |
c61c65cd | 59 | static void apc_swift_idle(void) |
1da177e4 LT |
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 | ||
7e7e2f03 | 72 | static inline void apc_free(struct of_device *op) |
1da177e4 | 73 | { |
7e7e2f03 | 74 | of_iounmap(&op->resource[0], regs, resource_size(&op->resource[0])); |
1da177e4 LT |
75 | } |
76 | ||
77 | static int apc_open(struct inode *inode, struct file *f) | |
78 | { | |
ee30d64e | 79 | cycle_kernel_lock(); |
1da177e4 LT |
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 LT |
89 | { |
90 | __u8 inarg, __user *arg; | |
91 | ||
92 | arg = (__u8 __user *) __arg; | |
ab772027 SG |
93 | |
94 | lock_kernel(); | |
95 | ||
1da177e4 LT |
96 | switch (cmd) { |
97 | case APCIOCGFANCTL: | |
ab772027 SG |
98 | if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg)) { |
99 | unlock_kernel(); | |
100 | return -EFAULT; | |
101 | } | |
1da177e4 LT |
102 | break; |
103 | ||
104 | case APCIOCGCPWR: | |
ab772027 SG |
105 | if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg)) { |
106 | unlock_kernel(); | |
1da177e4 | 107 | return -EFAULT; |
ab772027 | 108 | } |
1da177e4 LT |
109 | break; |
110 | ||
111 | case APCIOCGBPORT: | |
ab772027 SG |
112 | if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg)) { |
113 | unlock_kernel(); | |
1da177e4 | 114 | return -EFAULT; |
ab772027 | 115 | } |
1da177e4 LT |
116 | break; |
117 | ||
118 | case APCIOCSFANCTL: | |
ab772027 SG |
119 | if (get_user(inarg, arg)) { |
120 | unlock_kernel(); | |
1da177e4 | 121 | return -EFAULT; |
ab772027 | 122 | } |
1da177e4 LT |
123 | apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG); |
124 | break; | |
125 | case APCIOCSCPWR: | |
ab772027 SG |
126 | if (get_user(inarg, arg)) { |
127 | unlock_kernel(); | |
1da177e4 | 128 | return -EFAULT; |
ab772027 | 129 | } |
1da177e4 LT |
130 | apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG); |
131 | break; | |
132 | case APCIOCSBPORT: | |
ab772027 SG |
133 | if (get_user(inarg, arg)) { |
134 | unlock_kernel(); | |
1da177e4 | 135 | return -EFAULT; |
ab772027 | 136 | } |
1da177e4 LT |
137 | apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG); |
138 | break; | |
139 | default: | |
ab772027 | 140 | unlock_kernel(); |
1da177e4 LT |
141 | return -EINVAL; |
142 | }; | |
143 | ||
ab772027 | 144 | unlock_kernel(); |
1da177e4 LT |
145 | return 0; |
146 | } | |
147 | ||
5dfe4c96 | 148 | static const struct file_operations apc_fops = { |
ab772027 SG |
149 | .unlocked_ioctl = apc_ioctl, |
150 | .open = apc_open, | |
151 | .release = apc_release, | |
1da177e4 LT |
152 | }; |
153 | ||
154 | static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops }; | |
155 | ||
7e7e2f03 DM |
156 | static int __devinit apc_probe(struct of_device *op, |
157 | const struct of_device_id *match) | |
1da177e4 | 158 | { |
7e7e2f03 | 159 | int err; |
1da177e4 | 160 | |
7e7e2f03 DM |
161 | regs = of_ioremap(&op->resource[0], 0, |
162 | resource_size(&op->resource[0]), APC_OBPNAME); | |
163 | if (!regs) { | |
1da177e4 LT |
164 | printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME); |
165 | return -ENODEV; | |
166 | } | |
167 | ||
7e7e2f03 DM |
168 | err = misc_register(&apc_miscdev); |
169 | if (err) { | |
1da177e4 | 170 | printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME); |
7e7e2f03 | 171 | apc_free(op); |
1da177e4 LT |
172 | return -ENODEV; |
173 | } | |
174 | ||
175 | /* Assign power management IDLE handler */ | |
7e7e2f03 | 176 | if (!apc_no_idle) |
1da177e4 LT |
177 | pm_idle = apc_swift_idle; |
178 | ||
179 | printk(KERN_INFO "%s: power management initialized%s\n", | |
7e7e2f03 DM |
180 | APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : ""); |
181 | ||
1da177e4 LT |
182 | return 0; |
183 | } | |
184 | ||
fd098316 | 185 | static struct of_device_id __initdata apc_match[] = { |
7e7e2f03 DM |
186 | { |
187 | .name = APC_OBPNAME, | |
188 | }, | |
189 | {}, | |
190 | }; | |
191 | MODULE_DEVICE_TABLE(of, apc_match); | |
192 | ||
193 | static struct of_platform_driver apc_driver = { | |
194 | .name = "apc", | |
195 | .match_table = apc_match, | |
196 | .probe = apc_probe, | |
197 | }; | |
198 | ||
199 | static int __init apc_init(void) | |
200 | { | |
201 | return of_register_driver(&apc_driver, &of_bus_type); | |
202 | } | |
203 | ||
1da177e4 LT |
204 | /* This driver is not critical to the boot process |
205 | * and is easiest to ioremap when SBus is already | |
206 | * initialized, so we install ourselves thusly: | |
207 | */ | |
7e7e2f03 | 208 | __initcall(apc_init); |