Commit | Line | Data |
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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> | |
1da177e4 | 11 | #include <linux/pm.h> |
f1b6aa87 DM |
12 | #include <linux/of.h> |
13 | #include <linux/of_device.h> | |
1da177e4 LT |
14 | |
15 | #include <asm/io.h> | |
1da177e4 LT |
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 | ||
1da177e4 | 26 | #define PMC_OBPNAME "SUNW,pmc" |
85bfbf44 | 27 | #define PMC_DEVNAME "pmc" |
1da177e4 LT |
28 | |
29 | #define PMC_IDLE_REG 0x00 | |
85bfbf44 | 30 | #define PMC_IDLE_ON 0x01 |
1da177e4 | 31 | |
f1b6aa87 | 32 | static u8 __iomem *regs; |
1da177e4 | 33 | |
f1b6aa87 | 34 | #define pmc_readb(offs) (sbus_readb(regs+offs)) |
85bfbf44 | 35 | #define pmc_writeb(val, offs) (sbus_writeb(val, regs+offs)) |
1da177e4 | 36 | |
85bfbf44 | 37 | /* |
1da177e4 LT |
38 | * CPU idle callback function |
39 | * See .../arch/sparc/kernel/process.c | |
40 | */ | |
39f6649b | 41 | static void pmc_swift_idle(void) |
1da177e4 LT |
42 | { |
43 | #ifdef PMC_DEBUG_LED | |
85bfbf44 | 44 | set_auxio(0x00, AUXIO_LED); |
1da177e4 LT |
45 | #endif |
46 | ||
47 | pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG); | |
48 | ||
49 | #ifdef PMC_DEBUG_LED | |
85bfbf44 | 50 | set_auxio(AUXIO_LED, 0x00); |
1da177e4 | 51 | #endif |
85bfbf44 | 52 | } |
1da177e4 | 53 | |
f1b6aa87 DM |
54 | static int __devinit pmc_probe(struct of_device *op, |
55 | const struct of_device_id *match) | |
1da177e4 | 56 | { |
f1b6aa87 DM |
57 | regs = of_ioremap(&op->resource[0], 0, |
58 | resource_size(&op->resource[0]), PMC_OBPNAME); | |
1da177e4 LT |
59 | if (!regs) { |
60 | printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME); | |
61 | return -ENODEV; | |
62 | } | |
63 | ||
64 | #ifndef PMC_NO_IDLE | |
65 | /* Assign power management IDLE handler */ | |
85bfbf44 | 66 | pm_idle = pmc_swift_idle; |
1da177e4 LT |
67 | #endif |
68 | ||
69 | printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME); | |
70 | return 0; | |
71 | } | |
72 | ||
fd098316 | 73 | static struct of_device_id __initdata pmc_match[] = { |
f1b6aa87 DM |
74 | { |
75 | .name = PMC_OBPNAME, | |
76 | }, | |
77 | {}, | |
78 | }; | |
79 | MODULE_DEVICE_TABLE(of, pmc_match); | |
80 | ||
81 | static struct of_platform_driver pmc_driver = { | |
82 | .name = "pmc", | |
83 | .match_table = pmc_match, | |
84 | .probe = pmc_probe, | |
85 | }; | |
86 | ||
87 | static int __init pmc_init(void) | |
88 | { | |
89 | return of_register_driver(&pmc_driver, &of_bus_type); | |
90 | } | |
91 | ||
1da177e4 LT |
92 | /* This driver is not critical to the boot process |
93 | * and is easiest to ioremap when SBus is already | |
94 | * initialized, so we install ourselves thusly: | |
95 | */ | |
f1b6aa87 | 96 | __initcall(pmc_init); |