mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 10:16:42 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
100 lines
2.0 KiB
C
100 lines
2.0 KiB
C
/* 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);
|