101 lines
2 KiB
C
101 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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/pm.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/module.h>
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#include <asm/io.h>
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#include <asm/oplib.h>
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#include <linux/uaccess.h>
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#include <asm/auxio.h>
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#include <asm/processor.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_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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static u8 __iomem *regs;
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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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static 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 int pmc_probe(struct platform_device *op)
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{
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regs = of_ioremap(&op->resource[0], 0,
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resource_size(&op->resource[0]), 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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sparc_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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static const struct of_device_id pmc_match[] = {
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{
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.name = PMC_OBPNAME,
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, pmc_match);
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static struct platform_driver pmc_driver = {
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.driver = {
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.name = "pmc",
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.of_match_table = pmc_match,
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},
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.probe = pmc_probe,
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};
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static int __init pmc_init(void)
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{
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return platform_driver_register(&pmc_driver);
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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_init);
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