Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* pmc - Driver implementation for power management functions |
2 | * of Power Management Controller (PMC) on SPARCstation-Voyager. | |
3 | * | |
4 | * Copyright (c) 2002 Eric Brower (ebrower@usa.net) | |
5 | */ | |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/fs.h> | |
9 | #include <linux/errno.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/miscdevice.h> | |
12 | #include <linux/pm.h> | |
13 | ||
14 | #include <asm/io.h> | |
15 | #include <asm/sbus.h> | |
16 | #include <asm/oplib.h> | |
17 | #include <asm/uaccess.h> | |
18 | #include <asm/auxio.h> | |
19 | ||
20 | /* Debug | |
21 | * | |
22 | * #define PMC_DEBUG_LED | |
23 | * #define PMC_NO_IDLE | |
24 | */ | |
25 | ||
26 | #define PMC_MINOR MISC_DYNAMIC_MINOR | |
27 | #define PMC_OBPNAME "SUNW,pmc" | |
28 | #define PMC_DEVNAME "pmc" | |
29 | ||
30 | #define PMC_IDLE_REG 0x00 | |
31 | #define PMC_IDLE_ON 0x01 | |
32 | ||
33 | volatile static u8 __iomem *regs; | |
34 | static int pmc_regsize; | |
35 | ||
36 | #define pmc_readb(offs) (sbus_readb(regs+offs)) | |
37 | #define pmc_writeb(val, offs) (sbus_writeb(val, regs+offs)) | |
38 | ||
39 | /* | |
40 | * CPU idle callback function | |
41 | * See .../arch/sparc/kernel/process.c | |
42 | */ | |
43 | void pmc_swift_idle(void) | |
44 | { | |
45 | #ifdef PMC_DEBUG_LED | |
46 | set_auxio(0x00, AUXIO_LED); | |
47 | #endif | |
48 | ||
49 | pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG); | |
50 | ||
51 | #ifdef PMC_DEBUG_LED | |
52 | set_auxio(AUXIO_LED, 0x00); | |
53 | #endif | |
54 | } | |
55 | ||
56 | static inline void pmc_free(void) | |
57 | { | |
58 | sbus_iounmap(regs, pmc_regsize); | |
59 | } | |
60 | ||
61 | static int __init pmc_probe(void) | |
62 | { | |
63 | struct sbus_bus *sbus = NULL; | |
64 | struct sbus_dev *sdev = NULL; | |
65 | for_each_sbus(sbus) { | |
66 | for_each_sbusdev(sdev, sbus) { | |
67 | if (!strcmp(sdev->prom_name, PMC_OBPNAME)) { | |
68 | goto sbus_done; | |
69 | } | |
70 | } | |
71 | } | |
72 | ||
73 | sbus_done: | |
74 | if (!sdev) { | |
75 | return -ENODEV; | |
76 | } | |
77 | ||
78 | pmc_regsize = sdev->reg_addrs[0].reg_size; | |
79 | regs = sbus_ioremap(&sdev->resource[0], 0, | |
80 | pmc_regsize, PMC_OBPNAME); | |
81 | if (!regs) { | |
82 | printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME); | |
83 | return -ENODEV; | |
84 | } | |
85 | ||
86 | #ifndef PMC_NO_IDLE | |
87 | /* Assign power management IDLE handler */ | |
88 | pm_idle = pmc_swift_idle; | |
89 | #endif | |
90 | ||
91 | printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME); | |
92 | return 0; | |
93 | } | |
94 | ||
95 | /* This driver is not critical to the boot process | |
96 | * and is easiest to ioremap when SBus is already | |
97 | * initialized, so we install ourselves thusly: | |
98 | */ | |
99 | __initcall(pmc_probe); |