projects / deliverable / linux.git / blame
| 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> | |
| 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 | |
| 4ebb24f7 | 54 | static int __devinit pmc_probe(struct platform_device *op) |
| 1da177e4 | 55 | { |
| f1b6aa87 DM |
56 | regs = of_ioremap(&op->resource[0], 0, |
| 57 | resource_size(&op->resource[0]), PMC_OBPNAME); | |
| 1da177e4 LT |
58 | if (!regs) { |
| 59 | printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME); | |
| 60 | return -ENODEV; | |
| 61 | } | |
| 62 | ||
| 63 | #ifndef PMC_NO_IDLE | |
| 64 | /* Assign power management IDLE handler */ | |
| 85bfbf44 | 65 | pm_idle = pmc_swift_idle; |
| 1da177e4 LT |
66 | #endif |
| 67 | ||
| 68 | printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME); | |
| 69 | return 0; | |
| 70 | } | |
| 71 | ||
| 505d9147 | 72 | static struct of_device_id pmc_match[] = { |
| f1b6aa87 DM |
73 | { |
| 74 | .name = PMC_OBPNAME, | |
| 75 | }, | |
| 76 | {}, | |
| 77 | }; | |
| 78 | MODULE_DEVICE_TABLE(of, pmc_match); | |
| 79 | ||
| 4ebb24f7 | 80 | static struct platform_driver pmc_driver = { |
| 4018294b GL |
81 | .driver = { |
| 82 | .name = "pmc", | |
| 83 | .owner = THIS_MODULE, | |
| 84 | .of_match_table = pmc_match, | |
| 85 | }, | |
| f1b6aa87 DM |
86 | .probe = pmc_probe, |
| 87 | }; | |
| 88 | ||
| 89 | static int __init pmc_init(void) | |
| 90 | { | |
| 4ebb24f7 | 91 | return platform_driver_register(&pmc_driver); |
| f1b6aa87 DM |
92 | } |
| 93 | ||
| 1da177e4 LT |
94 | /* This driver is not critical to the boot process |
| 95 | * and is easiest to ioremap when SBus is already | |
| 96 | * initialized, so we install ourselves thusly: | |
| 97 | */ | |
| f1b6aa87 | 98 | __initcall(pmc_init); |