blob: 9c115823c4b5e2a7a4e9596402bde120503477eb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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>
Arnd Bergmannee30d642008-05-20 19:16:48 +020013#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/pm.h>
David S. Miller7e7e2f02008-08-27 02:45:36 -070015#include <linux/of.h>
16#include <linux/of_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#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
David S. Miller7e7e2f02008-08-27 02:45:36 -070033static u8 __iomem *regs;
Frederic Weisbeckera1731e52008-10-21 21:55:33 -070034static int apc_no_idle __devinitdata = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
David S. Miller7e7e2f02008-08-27 02:45:36 -070036#define apc_readb(offs) (sbus_readb(regs+offs))
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#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 */
45static 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 */
Adrian Bunkc61c65c2008-06-05 11:40:58 -070059static void apc_swift_idle(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060{
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
David S. Miller7e7e2f02008-08-27 02:45:36 -070072static inline void apc_free(struct of_device *op)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
David S. Miller7e7e2f02008-08-27 02:45:36 -070074 of_iounmap(&op->resource[0], regs, resource_size(&op->resource[0]));
Linus Torvalds1da177e2005-04-16 15:20:36 -070075}
76
77static int apc_open(struct inode *inode, struct file *f)
78{
Arnd Bergmannee30d642008-05-20 19:16:48 +020079 cycle_kernel_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 return 0;
81}
82
83static int apc_release(struct inode *inode, struct file *f)
84{
85 return 0;
86}
87
Stoyan Gaydarovab772022008-07-14 22:12:29 -070088static long apc_ioctl(struct file *f, unsigned int cmd, unsigned long __arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
90 __u8 inarg, __user *arg;
91
92 arg = (__u8 __user *) __arg;
Stoyan Gaydarovab772022008-07-14 22:12:29 -070093
94 lock_kernel();
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 switch (cmd) {
97 case APCIOCGFANCTL:
Stoyan Gaydarovab772022008-07-14 22:12:29 -070098 if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg)) {
99 unlock_kernel();
100 return -EFAULT;
101 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 break;
103
104 case APCIOCGCPWR:
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700105 if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg)) {
106 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 return -EFAULT;
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700108 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 break;
110
111 case APCIOCGBPORT:
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700112 if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg)) {
113 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 return -EFAULT;
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700115 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 break;
117
118 case APCIOCSFANCTL:
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700119 if (get_user(inarg, arg)) {
120 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return -EFAULT;
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700122 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG);
124 break;
125 case APCIOCSCPWR:
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700126 if (get_user(inarg, arg)) {
127 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 return -EFAULT;
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700129 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG);
131 break;
132 case APCIOCSBPORT:
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700133 if (get_user(inarg, arg)) {
134 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 return -EFAULT;
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700136 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG);
138 break;
139 default:
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700140 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 return -EINVAL;
142 };
143
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700144 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 return 0;
146}
147
Arjan van de Ven5dfe4c92007-02-12 00:55:31 -0800148static const struct file_operations apc_fops = {
Stoyan Gaydarovab772022008-07-14 22:12:29 -0700149 .unlocked_ioctl = apc_ioctl,
150 .open = apc_open,
151 .release = apc_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152};
153
154static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops };
155
David S. Miller7e7e2f02008-08-27 02:45:36 -0700156static int __devinit apc_probe(struct of_device *op,
157 const struct of_device_id *match)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
David S. Miller7e7e2f02008-08-27 02:45:36 -0700159 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
David S. Miller7e7e2f02008-08-27 02:45:36 -0700161 regs = of_ioremap(&op->resource[0], 0,
162 resource_size(&op->resource[0]), APC_OBPNAME);
163 if (!regs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME);
165 return -ENODEV;
166 }
167
David S. Miller7e7e2f02008-08-27 02:45:36 -0700168 err = misc_register(&apc_miscdev);
169 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME);
David S. Miller7e7e2f02008-08-27 02:45:36 -0700171 apc_free(op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 return -ENODEV;
173 }
174
175 /* Assign power management IDLE handler */
David S. Miller7e7e2f02008-08-27 02:45:36 -0700176 if (!apc_no_idle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 pm_idle = apc_swift_idle;
178
179 printk(KERN_INFO "%s: power management initialized%s\n",
David S. Miller7e7e2f02008-08-27 02:45:36 -0700180 APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : "");
181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 return 0;
183}
184
David S. Millerfd098312008-08-31 01:23:17 -0700185static struct of_device_id __initdata apc_match[] = {
David S. Miller7e7e2f02008-08-27 02:45:36 -0700186 {
187 .name = APC_OBPNAME,
188 },
189 {},
190};
191MODULE_DEVICE_TABLE(of, apc_match);
192
193static struct of_platform_driver apc_driver = {
194 .name = "apc",
195 .match_table = apc_match,
196 .probe = apc_probe,
197};
198
199static int __init apc_init(void)
200{
201 return of_register_driver(&apc_driver, &of_bus_type);
202}
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204/* 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 */
David S. Miller7e7e2f02008-08-27 02:45:36 -0700208__initcall(apc_init);