100 lines
2.0 KiB
C
100 lines
2.0 KiB
C
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/* pmc - Driver implementation for power management functions
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* of Power Management Controller (PMC) on SPARCstation-Voyager.
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*
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* Copyright (c) 2002 Eric Brower (ebrower@usa.net)
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#include <linux/pm.h>
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#include <asm/io.h>
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#include <asm/sbus.h>
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#include <asm/oplib.h>
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#include <asm/uaccess.h>
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#include <asm/auxio.h>
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/* Debug
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*
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* #define PMC_DEBUG_LED
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* #define PMC_NO_IDLE
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*/
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#define PMC_MINOR MISC_DYNAMIC_MINOR
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#define PMC_OBPNAME "SUNW,pmc"
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#define PMC_DEVNAME "pmc"
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#define PMC_IDLE_REG 0x00
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#define PMC_IDLE_ON 0x01
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volatile static u8 __iomem *regs;
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static int pmc_regsize;
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#define pmc_readb(offs) (sbus_readb(regs+offs))
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#define pmc_writeb(val, offs) (sbus_writeb(val, regs+offs))
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/*
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* CPU idle callback function
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* See .../arch/sparc/kernel/process.c
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*/
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void pmc_swift_idle(void)
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{
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#ifdef PMC_DEBUG_LED
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set_auxio(0x00, AUXIO_LED);
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#endif
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pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG);
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#ifdef PMC_DEBUG_LED
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set_auxio(AUXIO_LED, 0x00);
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#endif
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}
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static inline void pmc_free(void)
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{
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sbus_iounmap(regs, pmc_regsize);
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}
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static int __init pmc_probe(void)
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{
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struct sbus_bus *sbus = NULL;
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struct sbus_dev *sdev = NULL;
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for_each_sbus(sbus) {
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for_each_sbusdev(sdev, sbus) {
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if (!strcmp(sdev->prom_name, PMC_OBPNAME)) {
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goto sbus_done;
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}
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}
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}
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sbus_done:
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if (!sdev) {
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return -ENODEV;
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}
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pmc_regsize = sdev->reg_addrs[0].reg_size;
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regs = sbus_ioremap(&sdev->resource[0], 0,
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pmc_regsize, PMC_OBPNAME);
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if (!regs) {
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printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME);
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return -ENODEV;
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}
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#ifndef PMC_NO_IDLE
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/* Assign power management IDLE handler */
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pm_idle = pmc_swift_idle;
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#endif
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printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME);
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return 0;
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}
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/* This driver is not critical to the boot process
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* and is easiest to ioremap when SBus is already
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* initialized, so we install ourselves thusly:
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*/
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__initcall(pmc_probe);
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