101 lines
2.0 KiB
C
101 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* 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/pm.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/oplib.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/auxio.h>
|
|
#include <asm/processor.h>
|
|
|
|
/* Debug
|
|
*
|
|
* #define PMC_DEBUG_LED
|
|
* #define PMC_NO_IDLE
|
|
*/
|
|
|
|
#define PMC_OBPNAME "SUNW,pmc"
|
|
#define PMC_DEVNAME "pmc"
|
|
|
|
#define PMC_IDLE_REG 0x00
|
|
#define PMC_IDLE_ON 0x01
|
|
|
|
static u8 __iomem *regs;
|
|
|
|
#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
|
|
*/
|
|
static 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 int pmc_probe(struct platform_device *op)
|
|
{
|
|
regs = of_ioremap(&op->resource[0], 0,
|
|
resource_size(&op->resource[0]), 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 */
|
|
sparc_idle = pmc_swift_idle;
|
|
#endif
|
|
|
|
printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME);
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id pmc_match[] = {
|
|
{
|
|
.name = PMC_OBPNAME,
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, pmc_match);
|
|
|
|
static struct platform_driver pmc_driver = {
|
|
.driver = {
|
|
.name = "pmc",
|
|
.of_match_table = pmc_match,
|
|
},
|
|
.probe = pmc_probe,
|
|
};
|
|
|
|
static int __init pmc_init(void)
|
|
{
|
|
return platform_driver_register(&pmc_driver);
|
|
}
|
|
|
|
/* 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_init);
|