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!
187 lines
3.9 KiB
C
187 lines
3.9 KiB
C
/* apc - Driver implementation for power management functions
|
|
* of Aurora Personality Chip (APC) on SPARCstation-4/5 and
|
|
* derivatives.
|
|
*
|
|
* 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>
|
|
#include <asm/apc.h>
|
|
|
|
/* Debugging
|
|
*
|
|
* #define APC_DEBUG_LED
|
|
*/
|
|
|
|
#define APC_MINOR MISC_DYNAMIC_MINOR
|
|
#define APC_OBPNAME "power-management"
|
|
#define APC_DEVNAME "apc"
|
|
|
|
volatile static u8 __iomem *regs;
|
|
static int apc_regsize;
|
|
static int apc_no_idle __initdata = 0;
|
|
|
|
#define apc_readb(offs) (sbus_readb(regs+offs))
|
|
#define apc_writeb(val, offs) (sbus_writeb(val, regs+offs))
|
|
|
|
/* Specify "apc=noidle" on the kernel command line to
|
|
* disable APC CPU standby support. Certain prototype
|
|
* systems (SPARCstation-Fox) do not play well with APC
|
|
* CPU idle, so disable this if your system has APC and
|
|
* crashes randomly.
|
|
*/
|
|
static int __init apc_setup(char *str)
|
|
{
|
|
if(!strncmp(str, "noidle", strlen("noidle"))) {
|
|
apc_no_idle = 1;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
__setup("apc=", apc_setup);
|
|
|
|
/*
|
|
* CPU idle callback function
|
|
* See .../arch/sparc/kernel/process.c
|
|
*/
|
|
void apc_swift_idle(void)
|
|
{
|
|
#ifdef APC_DEBUG_LED
|
|
set_auxio(0x00, AUXIO_LED);
|
|
#endif
|
|
|
|
apc_writeb(apc_readb(APC_IDLE_REG) | APC_IDLE_ON, APC_IDLE_REG);
|
|
|
|
#ifdef APC_DEBUG_LED
|
|
set_auxio(AUXIO_LED, 0x00);
|
|
#endif
|
|
}
|
|
|
|
static inline void apc_free(void)
|
|
{
|
|
sbus_iounmap(regs, apc_regsize);
|
|
}
|
|
|
|
static int apc_open(struct inode *inode, struct file *f)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int apc_release(struct inode *inode, struct file *f)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int apc_ioctl(struct inode *inode, struct file *f,
|
|
unsigned int cmd, unsigned long __arg)
|
|
{
|
|
__u8 inarg, __user *arg;
|
|
|
|
arg = (__u8 __user *) __arg;
|
|
switch (cmd) {
|
|
case APCIOCGFANCTL:
|
|
if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case APCIOCGCPWR:
|
|
if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case APCIOCGBPORT:
|
|
if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case APCIOCSFANCTL:
|
|
if (get_user(inarg, arg))
|
|
return -EFAULT;
|
|
apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG);
|
|
break;
|
|
case APCIOCSCPWR:
|
|
if (get_user(inarg, arg))
|
|
return -EFAULT;
|
|
apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG);
|
|
break;
|
|
case APCIOCSBPORT:
|
|
if (get_user(inarg, arg))
|
|
return -EFAULT;
|
|
apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
};
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct file_operations apc_fops = {
|
|
.ioctl = apc_ioctl,
|
|
.open = apc_open,
|
|
.release = apc_release,
|
|
};
|
|
|
|
static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops };
|
|
|
|
static int __init apc_probe(void)
|
|
{
|
|
struct sbus_bus *sbus = NULL;
|
|
struct sbus_dev *sdev = NULL;
|
|
int iTmp = 0;
|
|
|
|
for_each_sbus(sbus) {
|
|
for_each_sbusdev(sdev, sbus) {
|
|
if (!strcmp(sdev->prom_name, APC_OBPNAME)) {
|
|
goto sbus_done;
|
|
}
|
|
}
|
|
}
|
|
|
|
sbus_done:
|
|
if (!sdev) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
apc_regsize = sdev->reg_addrs[0].reg_size;
|
|
regs = sbus_ioremap(&sdev->resource[0], 0,
|
|
apc_regsize, APC_OBPNAME);
|
|
if(!regs) {
|
|
printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME);
|
|
return -ENODEV;
|
|
}
|
|
|
|
iTmp = misc_register(&apc_miscdev);
|
|
if (iTmp != 0) {
|
|
printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME);
|
|
apc_free();
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Assign power management IDLE handler */
|
|
if(!apc_no_idle)
|
|
pm_idle = apc_swift_idle;
|
|
|
|
printk(KERN_INFO "%s: power management initialized%s\n",
|
|
APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : "");
|
|
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(apc_probe);
|
|
|