[GitHub/mt8127/android_kernel_alcatel_ttab.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/smp_lock.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
 */
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(void)
{
	sbus_iounmap(regs, apc_regsize);
}

static int apc_open(struct inode *inode, struct file *f)
{
	cycle_kernel_lock();
	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 const 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);
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>
ee30d64e	13	#include <linux/smp_lock.h>
1da177e4 LT	14	#include <linux/pm.h>
	15
	16	#include <asm/io.h>
	17	#include <asm/sbus.h>
	18	#include <asm/oplib.h>
	19	#include <asm/uaccess.h>
	20	#include <asm/auxio.h>
	21	#include <asm/apc.h>
	22
	23	/* Debugging
	24	*
	25	* #define APC_DEBUG_LED
	26	*/
	27
	28	#define APC_MINOR MISC_DYNAMIC_MINOR
	29	#define APC_OBPNAME "power-management"
	30	#define APC_DEVNAME "apc"
	31
	32	volatile static u8 __iomem *regs;
	33	static int apc_regsize;
	34	static int apc_no_idle __initdata = 0;
	35
	36	#define apc_readb(offs) (sbus_readb(regs+offs))
	37	#define apc_writeb(val, offs) (sbus_writeb(val, regs+offs))
	38
	39	/* Specify "apc=noidle" on the kernel command line to
	40	* disable APC CPU standby support. Certain prototype
	41	* systems (SPARCstation-Fox) do not play well with APC
	42	* CPU idle, so disable this if your system has APC and
	43	* crashes randomly.
	44	*/
	45	static int __init apc_setup(char *str)
	46	{
	47	if(!strncmp(str, "noidle", strlen("noidle"))) {
	48	apc_no_idle = 1;
	49	return 1;
	50	}
	51	return 0;
	52	}
	53	__setup("apc=", apc_setup);
	54
	55	/*
	56	* CPU idle callback function
	57	* See .../arch/sparc/kernel/process.c
	58	*/
c61c65cd	59	static void apc_swift_idle(void)
1da177e4 LT	60	{
	61	#ifdef APC_DEBUG_LED
	62	set_auxio(0x00, AUXIO_LED);
	63	#endif
	64
	65	apc_writeb(apc_readb(APC_IDLE_REG) \| APC_IDLE_ON, APC_IDLE_REG);
	66
	67	#ifdef APC_DEBUG_LED
	68	set_auxio(AUXIO_LED, 0x00);
	69	#endif
	70	}
	71
	72	static inline void apc_free(void)
	73	{
	74	sbus_iounmap(regs, apc_regsize);
	75	}
	76
	77	static int apc_open(struct inode inode, struct file f)
	78	{
ee30d64e	79	cycle_kernel_lock();
1da177e4 LT	80	return 0;
	81	}
	82
	83	static int apc_release(struct inode inode, struct file f)
	84	{
	85	return 0;
	86	}
	87
	88	static int apc_ioctl(struct inode inode, struct file f,
	89	unsigned int cmd, unsigned long __arg)
	90	{
	91	__u8 inarg, __user *arg;
	92
	93	arg = (__u8 __user *) __arg;
	94	switch (cmd) {
	95	case APCIOCGFANCTL:
	96	if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg))
	97	return -EFAULT;
	98	break;
	99
	100	case APCIOCGCPWR:
	101	if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg))
	102	return -EFAULT;
	103	break;
	104
	105	case APCIOCGBPORT:
	106	if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg))
	107	return -EFAULT;
	108	break;
	109
	110	case APCIOCSFANCTL:
	111	if (get_user(inarg, arg))
	112	return -EFAULT;
	113	apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG);
	114	break;
	115	case APCIOCSCPWR:
	116	if (get_user(inarg, arg))
	117	return -EFAULT;
	118	apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG);
	119	break;
	120	case APCIOCSBPORT:
	121	if (get_user(inarg, arg))
	122	return -EFAULT;
	123	apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG);
	124	break;
	125	default:
	126	return -EINVAL;
	127	};
	128
	129	return 0;
	130	}
	131
5dfe4c96	132	static const struct file_operations apc_fops = {
1da177e4 LT	133	.ioctl = apc_ioctl,
	134	.open = apc_open,
	135	.release = apc_release,
	136	};
	137
	138	static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops };
	139
	140	static int __init apc_probe(void)
	141	{
	142	struct sbus_bus *sbus = NULL;
	143	struct sbus_dev *sdev = NULL;
	144	int iTmp = 0;
	145
	146	for_each_sbus(sbus) {
	147	for_each_sbusdev(sdev, sbus) {
	148	if (!strcmp(sdev->prom_name, APC_OBPNAME)) {
	149	goto sbus_done;
	150	}
	151	}
	152	}
	153
	154	sbus_done:
	155	if (!sdev) {
	156	return -ENODEV;
	157	}
	158
	159	apc_regsize = sdev->reg_addrs[0].reg_size;
	160	regs = sbus_ioremap(&sdev->resource[0], 0,
	161	apc_regsize, APC_OBPNAME);
	162	if(!regs) {
	163	printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME);
	164	return -ENODEV;
	165	}
	166
	167	iTmp = misc_register(&apc_miscdev);
	168	if (iTmp != 0) {
	169	printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME);
	170	apc_free();
	171	return -ENODEV;
	172	}
	173
	174	/* Assign power management IDLE handler */
	175	if(!apc_no_idle)
	176	pm_idle = apc_swift_idle;
	177
	178	printk(KERN_INFO "%s: power management initialized%s\n",
	179	APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : "");
	180	return 0;
	181	}
	182
	183	/* This driver is not critical to the boot process
	184	* and is easiest to ioremap when SBus is already
	185	* initialized, so we install ourselves thusly:
	186	*/
	187	__initcall(apc_probe);
	188