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Linux/arch/sparc/kernel/pmc.c

  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/pm.h>
 12 #include <linux/of.h>
 13 #include <linux/of_device.h>
 14 #include <linux/module.h>
 15 
 16 #include <asm/io.h>
 17 #include <asm/oplib.h>
 18 #include <asm/uaccess.h>
 19 #include <asm/auxio.h>
 20 #include <asm/processor.h>
 21 
 22 /* Debug
 23  *
 24  * #define PMC_DEBUG_LED
 25  * #define PMC_NO_IDLE
 26  */
 27 
 28 #define PMC_OBPNAME     "SUNW,pmc"
 29 #define PMC_DEVNAME     "pmc"
 30 
 31 #define PMC_IDLE_REG    0x00
 32 #define PMC_IDLE_ON     0x01
 33 
 34 static u8 __iomem *regs;
 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 static 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 int pmc_probe(struct platform_device *op)
 57 {
 58         regs = of_ioremap(&op->resource[0], 0,
 59                           resource_size(&op->resource[0]), PMC_OBPNAME);
 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 */
 67         sparc_idle = pmc_swift_idle;
 68 #endif
 69 
 70         printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME);
 71         return 0;
 72 }
 73 
 74 static struct of_device_id pmc_match[] = {
 75         {
 76                 .name = PMC_OBPNAME,
 77         },
 78         {},
 79 };
 80 MODULE_DEVICE_TABLE(of, pmc_match);
 81 
 82 static struct platform_driver pmc_driver = {
 83         .driver = {
 84                 .name = "pmc",
 85                 .owner = THIS_MODULE,
 86                 .of_match_table = pmc_match,
 87         },
 88         .probe          = pmc_probe,
 89 };
 90 
 91 static int __init pmc_init(void)
 92 {
 93         return platform_driver_register(&pmc_driver);
 94 }
 95 
 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  */
100 __initcall(pmc_init);
101 

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