Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* pmc - Driver implementation for power management functions

 * of Power Management Controller (PMC) on SPARCstation-Voyager.

 *

 * Copyright (c) 2002 Eric Brower (ebrower@usa.net)

 */

#include <linux/kernel.h>

#include <linux/fs.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/miscdevice.h>

#include <linux/pm.h>

#include <asm/io.h>

#include <asm/sbus.h>

#include <asm/oplib.h>

#include <asm/uaccess.h>

#include <asm/auxio.h>

/* Debug

 *

 * #define PMC_DEBUG_LED

 * #define PMC_NO_IDLE

 */

#define PMC_MINOR       MISC_DYNAMIC_MINOR

#define PMC_OBPNAME     "SUNW,pmc"

#define PMC_DEVNAME "pmc"

#define PMC_IDLE_REG    0x00

#define PMC_IDLE_ON             0x01

volatile static u8 __iomem *regs;

static int pmc_regsize;

#define pmc_readb(offs)                 (sbus_readb(regs+offs))

#define pmc_writeb(val, offs)   (sbus_writeb(val, regs+offs))

/*

 * CPU idle callback function

 * See .../arch/sparc/kernel/process.c

 */

void pmc_swift_idle(void)

{

#ifdef PMC_DEBUG_LED

        set_auxio(0x00, AUXIO_LED);

#endif

        pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG);

#ifdef PMC_DEBUG_LED

        set_auxio(AUXIO_LED, 0x00);

#endif

}

static inline void pmc_free(void)

{

        sbus_iounmap(regs, pmc_regsize);

}

static int __init pmc_probe(void)

{

        struct sbus_bus *sbus = NULL;

        struct sbus_dev *sdev = NULL;

        for_each_sbus(sbus) {

                for_each_sbusdev(sdev, sbus) {

                        if (!strcmp(sdev->prom_name, PMC_OBPNAME)) {

                                goto sbus_done;

                        }

                }

        }

sbus_done:

        if (!sdev) {

                return -ENODEV;

        }

        pmc_regsize = sdev->reg_addrs[0].reg_size;

        regs = sbus_ioremap(&sdev->resource[0], 0,

                                   pmc_regsize, PMC_OBPNAME);

        if (!regs) {

                printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME);

                return -ENODEV;

        }

#ifndef PMC_NO_IDLE

        /* Assign power management IDLE handler */

        pm_idle = pmc_swift_idle;

#endif

        printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME);

        return 0;

}

/* This driver is not critical to the boot process

 * and is easiest to ioremap when SBus is already

 * initialized, so we install ourselves thusly:

 */

__initcall(pmc_probe);