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> | |
f060ac54 | 14 | #include <linux/module.h> |
1da177e4 LT |
15 | |
16 | #include <asm/io.h> | |
1da177e4 LT |
17 | #include <asm/oplib.h> |
18 | #include <asm/uaccess.h> | |
19 | #include <asm/auxio.h> | |
d472ba84 | 20 | #include <asm/processor.h> |
1da177e4 LT |
21 | |
22 | /* Debug | |
23 | * | |
24 | * #define PMC_DEBUG_LED | |
25 | * #define PMC_NO_IDLE | |
26 | */ | |
27 | ||
1da177e4 | 28 | #define PMC_OBPNAME "SUNW,pmc" |
85bfbf44 | 29 | #define PMC_DEVNAME "pmc" |
1da177e4 LT |
30 | |
31 | #define PMC_IDLE_REG 0x00 | |
85bfbf44 | 32 | #define PMC_IDLE_ON 0x01 |
1da177e4 | 33 | |
f1b6aa87 | 34 | static u8 __iomem *regs; |
1da177e4 | 35 | |
f1b6aa87 | 36 | #define pmc_readb(offs) (sbus_readb(regs+offs)) |
85bfbf44 | 37 | #define pmc_writeb(val, offs) (sbus_writeb(val, regs+offs)) |
1da177e4 | 38 | |
85bfbf44 | 39 | /* |
1da177e4 LT |
40 | * CPU idle callback function |
41 | * See .../arch/sparc/kernel/process.c | |
42 | */ | |
39f6649b | 43 | static void pmc_swift_idle(void) |
1da177e4 LT |
44 | { |
45 | #ifdef PMC_DEBUG_LED | |
85bfbf44 | 46 | set_auxio(0x00, AUXIO_LED); |
1da177e4 LT |
47 | #endif |
48 | ||
49 | pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG); | |
50 | ||
51 | #ifdef PMC_DEBUG_LED | |
85bfbf44 | 52 | set_auxio(AUXIO_LED, 0x00); |
1da177e4 | 53 | #endif |
85bfbf44 | 54 | } |
1da177e4 | 55 | |
7c9503b8 | 56 | static int pmc_probe(struct platform_device *op) |
1da177e4 | 57 | { |
f1b6aa87 DM |
58 | regs = of_ioremap(&op->resource[0], 0, |
59 | resource_size(&op->resource[0]), PMC_OBPNAME); | |
1da177e4 LT |
60 | if (!regs) { |
61 | printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME); | |
62 | return -ENODEV; | |
63 | } | |
64 | ||
65 | #ifndef PMC_NO_IDLE | |
66 | /* Assign power management IDLE handler */ | |
d472ba84 | 67 | sparc_idle = pmc_swift_idle; |
1da177e4 LT |
68 | #endif |
69 | ||
70 | printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME); | |
71 | return 0; | |
72 | } | |
73 | ||
505d9147 | 74 | static struct of_device_id pmc_match[] = { |
f1b6aa87 DM |
75 | { |
76 | .name = PMC_OBPNAME, | |
77 | }, | |
78 | {}, | |
79 | }; | |
80 | MODULE_DEVICE_TABLE(of, pmc_match); | |
81 | ||
4ebb24f7 | 82 | static struct platform_driver pmc_driver = { |
4018294b GL |
83 | .driver = { |
84 | .name = "pmc", | |
85 | .owner = THIS_MODULE, | |
86 | .of_match_table = pmc_match, | |
87 | }, | |
f1b6aa87 DM |
88 | .probe = pmc_probe, |
89 | }; | |
90 | ||
91 | static int __init pmc_init(void) | |
92 | { | |
4ebb24f7 | 93 | return platform_driver_register(&pmc_driver); |
f1b6aa87 DM |
94 | } |
95 | ||
1da177e4 LT |
96 | /* This driver is not critical to the boot process |
97 | * and is easiest to ioremap when SBus is already | |
98 | * initialized, so we install ourselves thusly: | |
99 | */ | |
f1b6aa87 | 100 | __initcall(pmc_init); |