Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* apc - Driver implementation for power management functions |
3 | * of Aurora Personality Chip (APC) on SPARCstation-4/5 and | |
4 | * derivatives. | |
5 | * | |
6 | * Copyright (c) 2002 Eric Brower (ebrower@usa.net) | |
7 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/miscdevice.h> | |
14 | #include <linux/pm.h> | |
7e7e2f03 | 15 | #include <linux/of.h> |
263291fa | 16 | #include <linux/platform_device.h> |
f060ac54 | 17 | #include <linux/module.h> |
1da177e4 LT |
18 | |
19 | #include <asm/io.h> | |
1da177e4 | 20 | #include <asm/oplib.h> |
7c0f6ba6 | 21 | #include <linux/uaccess.h> |
1da177e4 LT |
22 | #include <asm/auxio.h> |
23 | #include <asm/apc.h> | |
d472ba84 | 24 | #include <asm/processor.h> |
1da177e4 LT |
25 | |
26 | /* Debugging | |
27 | * | |
28 | * #define APC_DEBUG_LED | |
29 | */ | |
30 | ||
31 | #define APC_MINOR MISC_DYNAMIC_MINOR | |
32 | #define APC_OBPNAME "power-management" | |
33 | #define APC_DEVNAME "apc" | |
34 | ||
7e7e2f03 | 35 | static u8 __iomem *regs; |
7c9503b8 | 36 | static int apc_no_idle = 0; |
1da177e4 | 37 | |
7e7e2f03 | 38 | #define apc_readb(offs) (sbus_readb(regs+offs)) |
1da177e4 LT |
39 | #define apc_writeb(val, offs) (sbus_writeb(val, regs+offs)) |
40 | ||
41 | /* Specify "apc=noidle" on the kernel command line to | |
42 | * disable APC CPU standby support. Certain prototype | |
43 | * systems (SPARCstation-Fox) do not play well with APC | |
44 | * CPU idle, so disable this if your system has APC and | |
45 | * crashes randomly. | |
46 | */ | |
47 | static int __init apc_setup(char *str) | |
48 | { | |
49 | if(!strncmp(str, "noidle", strlen("noidle"))) { | |
50 | apc_no_idle = 1; | |
51 | return 1; | |
52 | } | |
53 | return 0; | |
54 | } | |
55 | __setup("apc=", apc_setup); | |
56 | ||
57 | /* | |
58 | * CPU idle callback function | |
59 | * See .../arch/sparc/kernel/process.c | |
60 | */ | |
c61c65cd | 61 | static void apc_swift_idle(void) |
1da177e4 LT |
62 | { |
63 | #ifdef APC_DEBUG_LED | |
64 | set_auxio(0x00, AUXIO_LED); | |
65 | #endif | |
66 | ||
67 | apc_writeb(apc_readb(APC_IDLE_REG) | APC_IDLE_ON, APC_IDLE_REG); | |
68 | ||
69 | #ifdef APC_DEBUG_LED | |
70 | set_auxio(AUXIO_LED, 0x00); | |
71 | #endif | |
72 | } | |
73 | ||
cd4cd730 | 74 | static inline void apc_free(struct platform_device *op) |
1da177e4 | 75 | { |
7e7e2f03 | 76 | of_iounmap(&op->resource[0], regs, resource_size(&op->resource[0])); |
1da177e4 LT |
77 | } |
78 | ||
79 | static int apc_open(struct inode *inode, struct file *f) | |
80 | { | |
81 | return 0; | |
82 | } | |
83 | ||
84 | static int apc_release(struct inode *inode, struct file *f) | |
85 | { | |
86 | return 0; | |
87 | } | |
88 | ||
ab772027 | 89 | static long apc_ioctl(struct file *f, unsigned int cmd, unsigned long __arg) |
1da177e4 | 90 | { |
49ab972a | 91 | __u8 inarg, __user *arg = (__u8 __user *) __arg; |
ab772027 | 92 | |
1da177e4 LT |
93 | switch (cmd) { |
94 | case APCIOCGFANCTL: | |
49ab972a | 95 | if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg)) |
ab772027 | 96 | return -EFAULT; |
1da177e4 LT |
97 | break; |
98 | ||
99 | case APCIOCGCPWR: | |
49ab972a | 100 | if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg)) |
1da177e4 LT |
101 | return -EFAULT; |
102 | break; | |
103 | ||
104 | case APCIOCGBPORT: | |
49ab972a | 105 | if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg)) |
1da177e4 LT |
106 | return -EFAULT; |
107 | break; | |
108 | ||
109 | case APCIOCSFANCTL: | |
49ab972a | 110 | if (get_user(inarg, arg)) |
1da177e4 LT |
111 | return -EFAULT; |
112 | apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG); | |
113 | break; | |
49ab972a | 114 | |
1da177e4 | 115 | case APCIOCSCPWR: |
49ab972a | 116 | if (get_user(inarg, arg)) |
1da177e4 LT |
117 | return -EFAULT; |
118 | apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG); | |
119 | break; | |
49ab972a | 120 | |
1da177e4 | 121 | case APCIOCSBPORT: |
49ab972a | 122 | if (get_user(inarg, arg)) |
1da177e4 LT |
123 | return -EFAULT; |
124 | apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG); | |
125 | break; | |
49ab972a | 126 | |
1da177e4 LT |
127 | default: |
128 | return -EINVAL; | |
6cb79b3f | 129 | } |
1da177e4 LT |
130 | |
131 | return 0; | |
132 | } | |
133 | ||
5dfe4c96 | 134 | static const struct file_operations apc_fops = { |
ab772027 SG |
135 | .unlocked_ioctl = apc_ioctl, |
136 | .open = apc_open, | |
137 | .release = apc_release, | |
6038f373 | 138 | .llseek = noop_llseek, |
1da177e4 LT |
139 | }; |
140 | ||
141 | static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops }; | |
142 | ||
7c9503b8 | 143 | static int apc_probe(struct platform_device *op) |
1da177e4 | 144 | { |
7e7e2f03 | 145 | int err; |
1da177e4 | 146 | |
7e7e2f03 DM |
147 | regs = of_ioremap(&op->resource[0], 0, |
148 | resource_size(&op->resource[0]), APC_OBPNAME); | |
149 | if (!regs) { | |
1da177e4 LT |
150 | printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME); |
151 | return -ENODEV; | |
152 | } | |
153 | ||
7e7e2f03 DM |
154 | err = misc_register(&apc_miscdev); |
155 | if (err) { | |
1da177e4 | 156 | printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME); |
7e7e2f03 | 157 | apc_free(op); |
1da177e4 LT |
158 | return -ENODEV; |
159 | } | |
160 | ||
161 | /* Assign power management IDLE handler */ | |
7e7e2f03 | 162 | if (!apc_no_idle) |
d472ba84 | 163 | sparc_idle = apc_swift_idle; |
1da177e4 LT |
164 | |
165 | printk(KERN_INFO "%s: power management initialized%s\n", | |
7e7e2f03 DM |
166 | APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : ""); |
167 | ||
1da177e4 LT |
168 | return 0; |
169 | } | |
170 | ||
69f57978 | 171 | static const struct of_device_id apc_match[] = { |
7e7e2f03 DM |
172 | { |
173 | .name = APC_OBPNAME, | |
174 | }, | |
175 | {}, | |
176 | }; | |
177 | MODULE_DEVICE_TABLE(of, apc_match); | |
178 | ||
4ebb24f7 | 179 | static struct platform_driver apc_driver = { |
4018294b GL |
180 | .driver = { |
181 | .name = "apc", | |
4018294b GL |
182 | .of_match_table = apc_match, |
183 | }, | |
7e7e2f03 DM |
184 | .probe = apc_probe, |
185 | }; | |
186 | ||
187 | static int __init apc_init(void) | |
188 | { | |
4ebb24f7 | 189 | return platform_driver_register(&apc_driver); |
7e7e2f03 DM |
190 | } |
191 | ||
1da177e4 LT |
192 | /* This driver is not critical to the boot process |
193 | * and is easiest to ioremap when SBus is already | |
194 | * initialized, so we install ourselves thusly: | |
195 | */ | |
7e7e2f03 | 196 | __initcall(apc_init); |