[deliverable/linux.git] / arch / sparc / kernel / apc.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 <linux/of.h>
#include <linux/of_device.h>
#include <linux/module.h>

#include <asm/io.h>
#include <asm/oplib.h>
#include <asm/uaccess.h>
#include <asm/auxio.h>
#include <asm/apc.h>
#include <asm/processor.h>

/* Debugging
 * 
 * #define APC_DEBUG_LED
 */

#define APC_MINOR	MISC_DYNAMIC_MINOR
#define APC_OBPNAME	"power-management"
#define APC_DEVNAME "apc"

static u8 __iomem *regs;
static int apc_no_idle = 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
 */
static 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(struct platform_device *op)
{
	of_iounmap(&op->resource[0], regs, resource_size(&op->resource[0]));
}

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 long apc_ioctl(struct file *f, unsigned int cmd, unsigned long __arg)
{
	__u8 inarg, __user *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 const struct file_operations apc_fops = {
	.unlocked_ioctl =	apc_ioctl,
	.open =			apc_open,
	.release =		apc_release,
	.llseek =		noop_llseek,
};

static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops };

static int apc_probe(struct platform_device *op)
{
	int err;

	regs = of_ioremap(&op->resource[0], 0,
			  resource_size(&op->resource[0]), APC_OBPNAME);
	if (!regs) {
		printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME);
		return -ENODEV;
	}

	err = misc_register(&apc_miscdev);
	if (err) {
		printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME);
		apc_free(op);
		return -ENODEV;
	}

	/* Assign power management IDLE handler */
	if (!apc_no_idle)
		sparc_idle = apc_swift_idle;

	printk(KERN_INFO "%s: power management initialized%s\n", 
	       APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : "");

	return 0;
}

static struct of_device_id apc_match[] = {
	{
		.name = APC_OBPNAME,
	},
	{},
};
MODULE_DEVICE_TABLE(of, apc_match);

static struct platform_driver apc_driver = {
	.driver = {
		.name = "apc",
		.owner = THIS_MODULE,
		.of_match_table = apc_match,
	},
	.probe		= apc_probe,
};

static int __init apc_init(void)
{
	return platform_driver_register(&apc_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(apc_init);
Commit	Line	Data
1da177e4 LT	1	/* apc - Driver implementation for power management functions
	2	* of Aurora Personality Chip (APC) on SPARCstation-4/5 and
	3	* derivatives.
	4	*
	5	* Copyright (c) 2002 Eric Brower (ebrower@usa.net)
	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/fs.h>
	10	#include <linux/errno.h>
	11	#include <linux/init.h>
	12	#include <linux/miscdevice.h>
	13	#include <linux/pm.h>
7e7e2f03 DM	14	#include <linux/of.h>
7e7e2f03 DM	15	#include <linux/of_device.h>
f060ac54	16	#include <linux/module.h>
1da177e4 LT	17
1da177e4 LT	18	#include <asm/io.h>
1da177e4 LT	19	#include <asm/oplib.h>
	20	#include <asm/uaccess.h>
	21	#include <asm/auxio.h>
	22	#include <asm/apc.h>
d472ba84	23	#include <asm/processor.h>
1da177e4 LT	24
	25	/* Debugging
	26	*
	27	* #define APC_DEBUG_LED
	28	*/
	29
	30	#define APC_MINOR MISC_DYNAMIC_MINOR
	31	#define APC_OBPNAME "power-management"
	32	#define APC_DEVNAME "apc"
	33
7e7e2f03	34	static u8 __iomem *regs;
7c9503b8	35	static int apc_no_idle = 0;
1da177e4	36
7e7e2f03	37	#define apc_readb(offs) (sbus_readb(regs+offs))
1da177e4 LT	38	#define apc_writeb(val, offs) (sbus_writeb(val, regs+offs))
	39
	40	/* Specify "apc=noidle" on the kernel command line to
	41	* disable APC CPU standby support. Certain prototype
	42	* systems (SPARCstation-Fox) do not play well with APC
	43	* CPU idle, so disable this if your system has APC and
	44	* crashes randomly.
	45	*/
	46	static int __init apc_setup(char *str)
	47	{
	48	if(!strncmp(str, "noidle", strlen("noidle"))) {
	49	apc_no_idle = 1;
	50	return 1;
	51	}
	52	return 0;
	53	}
	54	__setup("apc=", apc_setup);
	55
	56	/*
	57	* CPU idle callback function
	58	* See .../arch/sparc/kernel/process.c
	59	*/
c61c65cd	60	static void apc_swift_idle(void)
1da177e4 LT	61	{
	62	#ifdef APC_DEBUG_LED
	63	set_auxio(0x00, AUXIO_LED);
	64	#endif
	65
	66	apc_writeb(apc_readb(APC_IDLE_REG) \| APC_IDLE_ON, APC_IDLE_REG);
	67
	68	#ifdef APC_DEBUG_LED
	69	set_auxio(AUXIO_LED, 0x00);
	70	#endif
	71	}
	72
cd4cd730	73	static inline void apc_free(struct platform_device *op)
1da177e4	74	{
7e7e2f03	75	of_iounmap(&op->resource[0], regs, resource_size(&op->resource[0]));
1da177e4 LT	76	}
	77
	78	static int apc_open(struct inode inode, struct file f)
	79	{
	80	return 0;
	81	}
	82
	83	static int apc_release(struct inode inode, struct file f)
	84	{
	85	return 0;
	86	}
	87
ab772027	88	static long apc_ioctl(struct file *f, unsigned int cmd, unsigned long __arg)
1da177e4	89	{
49ab972a	90	__u8 inarg, __user arg = (__u8 __user ) __arg;
ab772027	91
1da177e4 LT	92	switch (cmd) {
1da177e4 LT	93	case APCIOCGFANCTL:
49ab972a	94	if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg))
ab772027	95	return -EFAULT;
1da177e4 LT	96	break;
	97
	98	case APCIOCGCPWR:
49ab972a	99	if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg))
1da177e4 LT	100	return -EFAULT;
	101	break;
	102
	103	case APCIOCGBPORT:
49ab972a	104	if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg))
1da177e4 LT	105	return -EFAULT;
	106	break;
	107
	108	case APCIOCSFANCTL:
49ab972a	109	if (get_user(inarg, arg))
1da177e4 LT	110	return -EFAULT;
	111	apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG);
	112	break;
49ab972a	113
1da177e4	114	case APCIOCSCPWR:
49ab972a	115	if (get_user(inarg, arg))
1da177e4 LT	116	return -EFAULT;
	117	apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG);
	118	break;
49ab972a	119
1da177e4	120	case APCIOCSBPORT:
49ab972a	121	if (get_user(inarg, arg))
1da177e4 LT	122	return -EFAULT;
	123	apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG);
	124	break;
49ab972a	125
1da177e4 LT	126	default:
1da177e4 LT	127	return -EINVAL;
6cb79b3f	128	}
1da177e4 LT	129
	130	return 0;
	131	}
	132
5dfe4c96	133	static const struct file_operations apc_fops = {
ab772027 SG	134	.unlocked_ioctl = apc_ioctl,
	135	.open = apc_open,
	136	.release = apc_release,
6038f373	137	.llseek = noop_llseek,
1da177e4 LT	138	};
	139
	140	static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops };
	141
7c9503b8	142	static int apc_probe(struct platform_device *op)
1da177e4	143	{
7e7e2f03	144	int err;
1da177e4	145
7e7e2f03 DM	146	regs = of_ioremap(&op->resource[0], 0,
	147	resource_size(&op->resource[0]), APC_OBPNAME);
	148	if (!regs) {
1da177e4 LT	149	printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME);
	150	return -ENODEV;
	151	}
	152
7e7e2f03 DM	153	err = misc_register(&apc_miscdev);
7e7e2f03 DM	154	if (err) {
1da177e4	155	printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME);
7e7e2f03	156	apc_free(op);
1da177e4 LT	157	return -ENODEV;
	158	}
	159
	160	/* Assign power management IDLE handler */
7e7e2f03	161	if (!apc_no_idle)
d472ba84	162	sparc_idle = apc_swift_idle;
1da177e4 LT	163
1da177e4 LT	164	printk(KERN_INFO "%s: power management initialized%s\n",
7e7e2f03 DM	165	APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : "");
7e7e2f03 DM	166
1da177e4 LT	167	return 0;
	168	}
	169
505d9147	170	static struct of_device_id apc_match[] = {
7e7e2f03 DM	171	{
	172	.name = APC_OBPNAME,
	173	},
	174	{},
	175	};
	176	MODULE_DEVICE_TABLE(of, apc_match);
	177
4ebb24f7	178	static struct platform_driver apc_driver = {
4018294b GL	179	.driver = {
	180	.name = "apc",
	181	.owner = THIS_MODULE,
	182	.of_match_table = apc_match,
	183	},
7e7e2f03 DM	184	.probe = apc_probe,
	185	};
	186
	187	static int __init apc_init(void)
	188	{
4ebb24f7	189	return platform_driver_register(&apc_driver);
7e7e2f03 DM	190	}
7e7e2f03 DM	191
1da177e4 LT	192	/* This driver is not critical to the boot process
	193	* and is easiest to ioremap when SBus is already
	194	* initialized, so we install ourselves thusly:
	195	*/
7e7e2f03	196	__initcall(apc_init);