[mirror_ubuntu-artful-kernel.git] / drivers / sbus / char / uctrl.c

/* uctrl.c: TS102 Microcontroller interface on Tadpole Sparcbook 3
 *
 * Copyright 1999 Derrick J Brashear (shadow@dementia.org)
 * Copyright 2008 David S. Miller (davem@davemloft.net)
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/ioport.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <linux/of.h>
#include <linux/of_device.h>

#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/pgtable.h>

#define UCTRL_MINOR	174

#define DEBUG 1
#ifdef DEBUG
#define dprintk(x) printk x
#else
#define dprintk(x)
#endif

struct uctrl_regs {
	u32 uctrl_intr;
	u32 uctrl_data;
	u32 uctrl_stat;
	u32 uctrl_xxx[5];
};

struct ts102_regs {
	u32 card_a_intr;
	u32 card_a_stat;
	u32 card_a_ctrl;
	u32 card_a_xxx;
	u32 card_b_intr;
	u32 card_b_stat;
	u32 card_b_ctrl;
	u32 card_b_xxx;
	u32 uctrl_intr;
	u32 uctrl_data;
	u32 uctrl_stat;
	u32 uctrl_xxx;
	u32 ts102_xxx[4];
};

/* Bits for uctrl_intr register */
#define UCTRL_INTR_TXE_REQ         0x01    /* transmit FIFO empty int req */
#define UCTRL_INTR_TXNF_REQ        0x02    /* transmit FIFO not full int req */
#define UCTRL_INTR_RXNE_REQ        0x04    /* receive FIFO not empty int req */
#define UCTRL_INTR_RXO_REQ         0x08    /* receive FIFO overflow int req */
#define UCTRL_INTR_TXE_MSK         0x10    /* transmit FIFO empty mask */
#define UCTRL_INTR_TXNF_MSK        0x20    /* transmit FIFO not full mask */
#define UCTRL_INTR_RXNE_MSK        0x40    /* receive FIFO not empty mask */
#define UCTRL_INTR_RXO_MSK         0x80    /* receive FIFO overflow mask */

/* Bits for uctrl_stat register */
#define UCTRL_STAT_TXE_STA         0x01    /* transmit FIFO empty status */
#define UCTRL_STAT_TXNF_STA        0x02    /* transmit FIFO not full status */
#define UCTRL_STAT_RXNE_STA        0x04    /* receive FIFO not empty status */
#define UCTRL_STAT_RXO_STA         0x08    /* receive FIFO overflow status */

static DEFINE_MUTEX(uctrl_mutex);
static const char *uctrl_extstatus[16] = {
        "main power available",
        "internal battery attached",
        "external battery attached",
        "external VGA attached",
        "external keyboard attached",
        "external mouse attached",
        "lid down",
        "internal battery currently charging",
        "external battery currently charging",
        "internal battery currently discharging",
        "external battery currently discharging",
};

/* Everything required for one transaction with the uctrl */
struct uctrl_txn {
	u8 opcode;
	u8 inbits;
	u8 outbits;
	u8 *inbuf;
	u8 *outbuf;
};

struct uctrl_status {
	u8 current_temp; /* 0x07 */
	u8 reset_status; /* 0x0b */
	u16 event_status; /* 0x0c */
	u16 error_status; /* 0x10 */
	u16 external_status; /* 0x11, 0x1b */
	u8 internal_charge; /* 0x18 */
	u8 external_charge; /* 0x19 */
	u16 control_lcd; /* 0x20 */
	u8 control_bitport; /* 0x21 */
	u8 speaker_volume; /* 0x23 */
	u8 control_tft_brightness; /* 0x24 */
	u8 control_kbd_repeat_delay; /* 0x28 */
	u8 control_kbd_repeat_period; /* 0x29 */
	u8 control_screen_contrast; /* 0x2F */
};

enum uctrl_opcode {
  READ_SERIAL_NUMBER=0x1,
  READ_ETHERNET_ADDRESS=0x2,
  READ_HARDWARE_VERSION=0x3,
  READ_MICROCONTROLLER_VERSION=0x4,
  READ_MAX_TEMPERATURE=0x5,
  READ_MIN_TEMPERATURE=0x6,
  READ_CURRENT_TEMPERATURE=0x7,
  READ_SYSTEM_VARIANT=0x8,
  READ_POWERON_CYCLES=0x9,
  READ_POWERON_SECONDS=0xA,
  READ_RESET_STATUS=0xB,
  READ_EVENT_STATUS=0xC,
  READ_REAL_TIME_CLOCK=0xD,
  READ_EXTERNAL_VGA_PORT=0xE,
  READ_MICROCONTROLLER_ROM_CHECKSUM=0xF,
  READ_ERROR_STATUS=0x10,
  READ_EXTERNAL_STATUS=0x11,
  READ_USER_CONFIGURATION_AREA=0x12,
  READ_MICROCONTROLLER_VOLTAGE=0x13,
  READ_INTERNAL_BATTERY_VOLTAGE=0x14,
  READ_DCIN_VOLTAGE=0x15,
  READ_HORIZONTAL_POINTER_VOLTAGE=0x16,
  READ_VERTICAL_POINTER_VOLTAGE=0x17,
  READ_INTERNAL_BATTERY_CHARGE_LEVEL=0x18,
  READ_EXTERNAL_BATTERY_CHARGE_LEVEL=0x19,
  READ_REAL_TIME_CLOCK_ALARM=0x1A,
  READ_EVENT_STATUS_NO_RESET=0x1B,
  READ_INTERNAL_KEYBOARD_LAYOUT=0x1C,
  READ_EXTERNAL_KEYBOARD_LAYOUT=0x1D,
  READ_EEPROM_STATUS=0x1E,
  CONTROL_LCD=0x20,
  CONTROL_BITPORT=0x21,
  SPEAKER_VOLUME=0x23,
  CONTROL_TFT_BRIGHTNESS=0x24,
  CONTROL_WATCHDOG=0x25,
  CONTROL_FACTORY_EEPROM_AREA=0x26,
  CONTROL_KBD_TIME_UNTIL_REPEAT=0x28,
  CONTROL_KBD_TIME_BETWEEN_REPEATS=0x29,
  CONTROL_TIMEZONE=0x2A,
  CONTROL_MARK_SPACE_RATIO=0x2B,
  CONTROL_DIAGNOSTIC_MODE=0x2E,
  CONTROL_SCREEN_CONTRAST=0x2F,
  RING_BELL=0x30,
  SET_DIAGNOSTIC_STATUS=0x32,
  CLEAR_KEY_COMBINATION_TABLE=0x33,
  PERFORM_SOFTWARE_RESET=0x34,
  SET_REAL_TIME_CLOCK=0x35,
  RECALIBRATE_POINTING_STICK=0x36,
  SET_BELL_FREQUENCY=0x37,
  SET_INTERNAL_BATTERY_CHARGE_RATE=0x39,
  SET_EXTERNAL_BATTERY_CHARGE_RATE=0x3A,
  SET_REAL_TIME_CLOCK_ALARM=0x3B,
  READ_EEPROM=0x40,
  WRITE_EEPROM=0x41,
  WRITE_TO_STATUS_DISPLAY=0x42,
  DEFINE_SPECIAL_CHARACTER=0x43,
  DEFINE_KEY_COMBINATION_ENTRY=0x50,
  DEFINE_STRING_TABLE_ENTRY=0x51,
  DEFINE_STATUS_SCREEN_DISPLAY=0x52,
  PERFORM_EMU_COMMANDS=0x64,
  READ_EMU_REGISTER=0x65,
  WRITE_EMU_REGISTER=0x66,
  READ_EMU_RAM=0x67,
  WRITE_EMU_RAM=0x68,
  READ_BQ_REGISTER=0x69,
  WRITE_BQ_REGISTER=0x6A,
  SET_USER_PASSWORD=0x70,
  VERIFY_USER_PASSWORD=0x71,
  GET_SYSTEM_PASSWORD_KEY=0x72,
  VERIFY_SYSTEM_PASSWORD=0x73,
  POWER_OFF=0x82,
  POWER_RESTART=0x83,
};

static struct uctrl_driver {
	struct uctrl_regs __iomem *regs;
	int irq;
	int pending;
	struct uctrl_status status;
} *global_driver;

static void uctrl_get_event_status(struct uctrl_driver *);
static void uctrl_get_external_status(struct uctrl_driver *);

static long
uctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	switch (cmd) {
		default:
			return -EINVAL;
	}
	return 0;
}

static int
uctrl_open(struct inode *inode, struct file *file)
{
	mutex_lock(&uctrl_mutex);
	uctrl_get_event_status(global_driver);
	uctrl_get_external_status(global_driver);
	mutex_unlock(&uctrl_mutex);
	return 0;
}

static irqreturn_t uctrl_interrupt(int irq, void *dev_id)
{
	return IRQ_HANDLED;
}

static const struct file_operations uctrl_fops = {
	.owner =	THIS_MODULE,
	.llseek =	no_llseek,
	.unlocked_ioctl =	uctrl_ioctl,
	.open =		uctrl_open,
};

static struct miscdevice uctrl_dev = {
	UCTRL_MINOR,
	"uctrl",
	&uctrl_fops
};

/* Wait for space to write, then write to it */
#define WRITEUCTLDATA(value) \
{ \
  unsigned int i; \
  for (i = 0; i < 10000; i++) { \
      if (UCTRL_STAT_TXNF_STA & sbus_readl(&driver->regs->uctrl_stat)) \
      break; \
  } \
  dprintk(("write data 0x%02x\n", value)); \
  sbus_writel(value, &driver->regs->uctrl_data); \
}

/* Wait for something to read, read it, then clear the bit */
#define READUCTLDATA(value) \
{ \
  unsigned int i; \
  value = 0; \
  for (i = 0; i < 10000; i++) { \
      if ((UCTRL_STAT_RXNE_STA & sbus_readl(&driver->regs->uctrl_stat)) == 0) \
      break; \
    udelay(1); \
  } \
  value = sbus_readl(&driver->regs->uctrl_data); \
  dprintk(("read data 0x%02x\n", value)); \
  sbus_writel(UCTRL_STAT_RXNE_STA, &driver->regs->uctrl_stat); \
}

static void uctrl_do_txn(struct uctrl_driver *driver, struct uctrl_txn *txn)
{
	int stat, incnt, outcnt, bytecnt, intr;
	u32 byte;

	stat = sbus_readl(&driver->regs->uctrl_stat);
	intr = sbus_readl(&driver->regs->uctrl_intr);
	sbus_writel(stat, &driver->regs->uctrl_stat);

	dprintk(("interrupt stat 0x%x int 0x%x\n", stat, intr));

	incnt = txn->inbits;
	outcnt = txn->outbits;
	byte = (txn->opcode << 8);
	WRITEUCTLDATA(byte);

	bytecnt = 0;
	while (incnt > 0) {
		byte = (txn->inbuf[bytecnt] << 8);
		WRITEUCTLDATA(byte);
		incnt--;
		bytecnt++;
	}

	/* Get the ack */
	READUCTLDATA(byte);
	dprintk(("ack was %x\n", (byte >> 8)));

	bytecnt = 0;
	while (outcnt > 0) {
		READUCTLDATA(byte);
		txn->outbuf[bytecnt] = (byte >> 8);
		dprintk(("set byte to %02x\n", byte));
		outcnt--;
		bytecnt++;
	}
}

static void uctrl_get_event_status(struct uctrl_driver *driver)
{
	struct uctrl_txn txn;
	u8 outbits[2];

	txn.opcode = READ_EVENT_STATUS;
	txn.inbits = 0;
	txn.outbits = 2;
	txn.inbuf = NULL;
	txn.outbuf = outbits;

	uctrl_do_txn(driver, &txn);

	dprintk(("bytes %x %x\n", (outbits[0] & 0xff), (outbits[1] & 0xff)));
	driver->status.event_status = 
		((outbits[0] & 0xff) << 8) | (outbits[1] & 0xff);
	dprintk(("ev is %x\n", driver->status.event_status));
}

static void uctrl_get_external_status(struct uctrl_driver *driver)
{
	struct uctrl_txn txn;
	u8 outbits[2];
	int i, v;

	txn.opcode = READ_EXTERNAL_STATUS;
	txn.inbits = 0;
	txn.outbits = 2;
	txn.inbuf = NULL;
	txn.outbuf = outbits;

	uctrl_do_txn(driver, &txn);

	dprintk(("bytes %x %x\n", (outbits[0] & 0xff), (outbits[1] & 0xff)));
	driver->status.external_status = 
		((outbits[0] * 256) + (outbits[1]));
	dprintk(("ex is %x\n", driver->status.external_status));
	v = driver->status.external_status;
	for (i = 0; v != 0; i++, v >>= 1) {
		if (v & 1) {
			dprintk(("%s%s", " ", uctrl_extstatus[i]));
		}
	}
	dprintk(("\n"));
	
}

static int uctrl_probe(struct platform_device *op)
{
	struct uctrl_driver *p;
	int err = -ENOMEM;

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p) {
		printk(KERN_ERR "uctrl: Unable to allocate device struct.\n");
		goto out;
	}

	p->regs = of_ioremap(&op->resource[0], 0,
			     resource_size(&op->resource[0]),
			     "uctrl");
	if (!p->regs) {
		printk(KERN_ERR "uctrl: Unable to map registers.\n");
		goto out_free;
	}

	p->irq = op->archdata.irqs[0];
	err = request_irq(p->irq, uctrl_interrupt, 0, "uctrl", p);
	if (err) {
		printk(KERN_ERR "uctrl: Unable to register irq.\n");
		goto out_iounmap;
	}

	err = misc_register(&uctrl_dev);
	if (err) {
		printk(KERN_ERR "uctrl: Unable to register misc device.\n");
		goto out_free_irq;
	}

	sbus_writel(UCTRL_INTR_RXNE_REQ|UCTRL_INTR_RXNE_MSK, &p->regs->uctrl_intr);
	printk(KERN_INFO "%pOF: uctrl regs[0x%p] (irq %d)\n",
	       op->dev.of_node, p->regs, p->irq);
	uctrl_get_event_status(p);
	uctrl_get_external_status(p);

	dev_set_drvdata(&op->dev, p);
	global_driver = p;

out:
	return err;

out_free_irq:
	free_irq(p->irq, p);

out_iounmap:
	of_iounmap(&op->resource[0], p->regs, resource_size(&op->resource[0]));

out_free:
	kfree(p);
	goto out;
}

static int uctrl_remove(struct platform_device *op)
{
	struct uctrl_driver *p = dev_get_drvdata(&op->dev);

	if (p) {
		misc_deregister(&uctrl_dev);
		free_irq(p->irq, p);
		of_iounmap(&op->resource[0], p->regs, resource_size(&op->resource[0]));
		kfree(p);
	}
	return 0;
}

static const struct of_device_id uctrl_match[] = {
	{
		.name = "uctrl",
	},
	{},
};
MODULE_DEVICE_TABLE(of, uctrl_match);

static struct platform_driver uctrl_driver = {
	.driver = {
		.name = "uctrl",
		.of_match_table = uctrl_match,
	},
	.probe		= uctrl_probe,
	.remove		= uctrl_remove,
};


module_platform_driver(uctrl_driver);

MODULE_LICENSE("GPL");
Commit	Line	Data
	1	/* uctrl.c: TS102 Microcontroller interface on Tadpole Sparcbook 3
	2	*
	3	* Copyright 1999 Derrick J Brashear (shadow@dementia.org)
	4	* Copyright 2008 David S. Miller (davem@davemloft.net)
	5	*/
	6
	7	#include <linux/module.h>
	8	#include <linux/errno.h>
	9	#include <linux/delay.h>
	10	#include <linux/interrupt.h>
	11	#include <linux/slab.h>
	12	#include <linux/mutex.h>
	13	#include <linux/ioport.h>
	14	#include <linux/miscdevice.h>
	15	#include <linux/mm.h>
	16	#include <linux/of.h>
	17	#include <linux/of_device.h>
	18
	19	#include <asm/openprom.h>
	20	#include <asm/oplib.h>
	21	#include <asm/irq.h>
	22	#include <asm/io.h>
	23	#include <asm/pgtable.h>
	24
	25	#define UCTRL_MINOR 174
	26
	27	#define DEBUG 1
	28	#ifdef DEBUG
	29	#define dprintk(x) printk x
	30	#else
	31	#define dprintk(x)
	32	#endif
	33
	34	struct uctrl_regs {
	35	u32 uctrl_intr;
	36	u32 uctrl_data;
	37	u32 uctrl_stat;
	38	u32 uctrl_xxx[5];
	39	};
	40
	41	struct ts102_regs {
	42	u32 card_a_intr;
	43	u32 card_a_stat;
	44	u32 card_a_ctrl;
	45	u32 card_a_xxx;
	46	u32 card_b_intr;
	47	u32 card_b_stat;
	48	u32 card_b_ctrl;
	49	u32 card_b_xxx;
	50	u32 uctrl_intr;
	51	u32 uctrl_data;
	52	u32 uctrl_stat;
	53	u32 uctrl_xxx;
	54	u32 ts102_xxx[4];
	55	};
	56
	57	/* Bits for uctrl_intr register */
	58	#define UCTRL_INTR_TXE_REQ 0x01 /* transmit FIFO empty int req */
	59	#define UCTRL_INTR_TXNF_REQ 0x02 /* transmit FIFO not full int req */
	60	#define UCTRL_INTR_RXNE_REQ 0x04 /* receive FIFO not empty int req */
	61	#define UCTRL_INTR_RXO_REQ 0x08 /* receive FIFO overflow int req */
	62	#define UCTRL_INTR_TXE_MSK 0x10 /* transmit FIFO empty mask */
	63	#define UCTRL_INTR_TXNF_MSK 0x20 /* transmit FIFO not full mask */
	64	#define UCTRL_INTR_RXNE_MSK 0x40 /* receive FIFO not empty mask */
	65	#define UCTRL_INTR_RXO_MSK 0x80 /* receive FIFO overflow mask */
	66
	67	/* Bits for uctrl_stat register */
	68	#define UCTRL_STAT_TXE_STA 0x01 /* transmit FIFO empty status */
	69	#define UCTRL_STAT_TXNF_STA 0x02 /* transmit FIFO not full status */
	70	#define UCTRL_STAT_RXNE_STA 0x04 /* receive FIFO not empty status */
	71	#define UCTRL_STAT_RXO_STA 0x08 /* receive FIFO overflow status */
	72
	73	static DEFINE_MUTEX(uctrl_mutex);
	74	static const char *uctrl_extstatus[16] = {
	75	"main power available",
	76	"internal battery attached",
	77	"external battery attached",
	78	"external VGA attached",
	79	"external keyboard attached",
	80	"external mouse attached",
	81	"lid down",
	82	"internal battery currently charging",
	83	"external battery currently charging",
	84	"internal battery currently discharging",
	85	"external battery currently discharging",
	86	};
	87
	88	/* Everything required for one transaction with the uctrl */
	89	struct uctrl_txn {
	90	u8 opcode;
	91	u8 inbits;
	92	u8 outbits;
	93	u8 *inbuf;
	94	u8 *outbuf;
	95	};
	96
	97	struct uctrl_status {
	98	u8 current_temp; /* 0x07 */
	99	u8 reset_status; /* 0x0b */
	100	u16 event_status; /* 0x0c */
	101	u16 error_status; /* 0x10 */
	102	u16 external_status; /* 0x11, 0x1b */
	103	u8 internal_charge; /* 0x18 */
	104	u8 external_charge; /* 0x19 */
	105	u16 control_lcd; /* 0x20 */
	106	u8 control_bitport; /* 0x21 */
	107	u8 speaker_volume; /* 0x23 */
	108	u8 control_tft_brightness; /* 0x24 */
	109	u8 control_kbd_repeat_delay; /* 0x28 */
	110	u8 control_kbd_repeat_period; /* 0x29 */
	111	u8 control_screen_contrast; /* 0x2F */
	112	};
	113
	114	enum uctrl_opcode {
	115	READ_SERIAL_NUMBER=0x1,
	116	READ_ETHERNET_ADDRESS=0x2,
	117	READ_HARDWARE_VERSION=0x3,
	118	READ_MICROCONTROLLER_VERSION=0x4,
	119	READ_MAX_TEMPERATURE=0x5,
	120	READ_MIN_TEMPERATURE=0x6,
	121	READ_CURRENT_TEMPERATURE=0x7,
	122	READ_SYSTEM_VARIANT=0x8,
	123	READ_POWERON_CYCLES=0x9,
	124	READ_POWERON_SECONDS=0xA,
	125	READ_RESET_STATUS=0xB,
	126	READ_EVENT_STATUS=0xC,
	127	READ_REAL_TIME_CLOCK=0xD,
	128	READ_EXTERNAL_VGA_PORT=0xE,
	129	READ_MICROCONTROLLER_ROM_CHECKSUM=0xF,
	130	READ_ERROR_STATUS=0x10,
	131	READ_EXTERNAL_STATUS=0x11,
	132	READ_USER_CONFIGURATION_AREA=0x12,
	133	READ_MICROCONTROLLER_VOLTAGE=0x13,
	134	READ_INTERNAL_BATTERY_VOLTAGE=0x14,
	135	READ_DCIN_VOLTAGE=0x15,
	136	READ_HORIZONTAL_POINTER_VOLTAGE=0x16,
	137	READ_VERTICAL_POINTER_VOLTAGE=0x17,
	138	READ_INTERNAL_BATTERY_CHARGE_LEVEL=0x18,
	139	READ_EXTERNAL_BATTERY_CHARGE_LEVEL=0x19,
	140	READ_REAL_TIME_CLOCK_ALARM=0x1A,
	141	READ_EVENT_STATUS_NO_RESET=0x1B,
	142	READ_INTERNAL_KEYBOARD_LAYOUT=0x1C,
	143	READ_EXTERNAL_KEYBOARD_LAYOUT=0x1D,
	144	READ_EEPROM_STATUS=0x1E,
	145	CONTROL_LCD=0x20,
	146	CONTROL_BITPORT=0x21,
	147	SPEAKER_VOLUME=0x23,
	148	CONTROL_TFT_BRIGHTNESS=0x24,
	149	CONTROL_WATCHDOG=0x25,
	150	CONTROL_FACTORY_EEPROM_AREA=0x26,
	151	CONTROL_KBD_TIME_UNTIL_REPEAT=0x28,
	152	CONTROL_KBD_TIME_BETWEEN_REPEATS=0x29,
	153	CONTROL_TIMEZONE=0x2A,
	154	CONTROL_MARK_SPACE_RATIO=0x2B,
	155	CONTROL_DIAGNOSTIC_MODE=0x2E,
	156	CONTROL_SCREEN_CONTRAST=0x2F,
	157	RING_BELL=0x30,
	158	SET_DIAGNOSTIC_STATUS=0x32,
	159	CLEAR_KEY_COMBINATION_TABLE=0x33,
	160	PERFORM_SOFTWARE_RESET=0x34,
	161	SET_REAL_TIME_CLOCK=0x35,
	162	RECALIBRATE_POINTING_STICK=0x36,
	163	SET_BELL_FREQUENCY=0x37,
	164	SET_INTERNAL_BATTERY_CHARGE_RATE=0x39,
	165	SET_EXTERNAL_BATTERY_CHARGE_RATE=0x3A,
	166	SET_REAL_TIME_CLOCK_ALARM=0x3B,
	167	READ_EEPROM=0x40,
	168	WRITE_EEPROM=0x41,
	169	WRITE_TO_STATUS_DISPLAY=0x42,
	170	DEFINE_SPECIAL_CHARACTER=0x43,
	171	DEFINE_KEY_COMBINATION_ENTRY=0x50,
	172	DEFINE_STRING_TABLE_ENTRY=0x51,
	173	DEFINE_STATUS_SCREEN_DISPLAY=0x52,
	174	PERFORM_EMU_COMMANDS=0x64,
	175	READ_EMU_REGISTER=0x65,
	176	WRITE_EMU_REGISTER=0x66,
	177	READ_EMU_RAM=0x67,
	178	WRITE_EMU_RAM=0x68,
	179	READ_BQ_REGISTER=0x69,
	180	WRITE_BQ_REGISTER=0x6A,
	181	SET_USER_PASSWORD=0x70,
	182	VERIFY_USER_PASSWORD=0x71,
	183	GET_SYSTEM_PASSWORD_KEY=0x72,
	184	VERIFY_SYSTEM_PASSWORD=0x73,
	185	POWER_OFF=0x82,
	186	POWER_RESTART=0x83,
	187	};
	188
	189	static struct uctrl_driver {
	190	struct uctrl_regs __iomem *regs;
	191	int irq;
	192	int pending;
	193	struct uctrl_status status;
	194	} *global_driver;
	195
	196	static void uctrl_get_event_status(struct uctrl_driver *);
	197	static void uctrl_get_external_status(struct uctrl_driver *);
	198
	199	static long
	200	uctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	201	{
	202	switch (cmd) {
	203	default:
	204	return -EINVAL;
	205	}
	206	return 0;
	207	}
	208
	209	static int
	210	uctrl_open(struct inode inode, struct file file)
	211	{
	212	mutex_lock(&uctrl_mutex);
	213	uctrl_get_event_status(global_driver);
	214	uctrl_get_external_status(global_driver);
	215	mutex_unlock(&uctrl_mutex);
	216	return 0;
	217	}
	218
	219	static irqreturn_t uctrl_interrupt(int irq, void *dev_id)
	220	{
	221	return IRQ_HANDLED;
	222	}
	223
	224	static const struct file_operations uctrl_fops = {
	225	.owner = THIS_MODULE,
	226	.llseek = no_llseek,
	227	.unlocked_ioctl = uctrl_ioctl,
	228	.open = uctrl_open,
	229	};
	230
	231	static struct miscdevice uctrl_dev = {
	232	UCTRL_MINOR,
	233	"uctrl",
	234	&uctrl_fops
	235	};
	236
	237	/* Wait for space to write, then write to it */
	238	#define WRITEUCTLDATA(value) \
	239	{ \
	240	unsigned int i; \
	241	for (i = 0; i < 10000; i++) { \
	242	if (UCTRL_STAT_TXNF_STA & sbus_readl(&driver->regs->uctrl_stat)) \
	243	break; \
	244	} \
	245	dprintk(("write data 0x%02x\n", value)); \
	246	sbus_writel(value, &driver->regs->uctrl_data); \
	247	}
	248
	249	/* Wait for something to read, read it, then clear the bit */
	250	#define READUCTLDATA(value) \
	251	{ \
	252	unsigned int i; \
	253	value = 0; \
	254	for (i = 0; i < 10000; i++) { \
	255	if ((UCTRL_STAT_RXNE_STA & sbus_readl(&driver->regs->uctrl_stat)) == 0) \
	256	break; \
	257	udelay(1); \
	258	} \
	259	value = sbus_readl(&driver->regs->uctrl_data); \
	260	dprintk(("read data 0x%02x\n", value)); \
	261	sbus_writel(UCTRL_STAT_RXNE_STA, &driver->regs->uctrl_stat); \
	262	}
	263
	264	static void uctrl_do_txn(struct uctrl_driver driver, struct uctrl_txn txn)
	265	{
	266	int stat, incnt, outcnt, bytecnt, intr;
	267	u32 byte;
	268
	269	stat = sbus_readl(&driver->regs->uctrl_stat);
	270	intr = sbus_readl(&driver->regs->uctrl_intr);
	271	sbus_writel(stat, &driver->regs->uctrl_stat);
	272
	273	dprintk(("interrupt stat 0x%x int 0x%x\n", stat, intr));
	274
	275	incnt = txn->inbits;
	276	outcnt = txn->outbits;
	277	byte = (txn->opcode << 8);
	278	WRITEUCTLDATA(byte);
	279
	280	bytecnt = 0;
	281	while (incnt > 0) {
	282	byte = (txn->inbuf[bytecnt] << 8);
	283	WRITEUCTLDATA(byte);
	284	incnt--;
	285	bytecnt++;
	286	}
	287
	288	/* Get the ack */
	289	READUCTLDATA(byte);
	290	dprintk(("ack was %x\n", (byte >> 8)));
	291
	292	bytecnt = 0;
	293	while (outcnt > 0) {
	294	READUCTLDATA(byte);
	295	txn->outbuf[bytecnt] = (byte >> 8);
	296	dprintk(("set byte to %02x\n", byte));
	297	outcnt--;
	298	bytecnt++;
	299	}
	300	}
	301
	302	static void uctrl_get_event_status(struct uctrl_driver *driver)
	303	{
	304	struct uctrl_txn txn;
	305	u8 outbits[2];
	306
	307	txn.opcode = READ_EVENT_STATUS;
	308	txn.inbits = 0;
	309	txn.outbits = 2;
	310	txn.inbuf = NULL;
	311	txn.outbuf = outbits;
	312
	313	uctrl_do_txn(driver, &txn);
	314
	315	dprintk(("bytes %x %x\n", (outbits[0] & 0xff), (outbits[1] & 0xff)));
	316	driver->status.event_status =
	317	((outbits[0] & 0xff) << 8) \| (outbits[1] & 0xff);
	318	dprintk(("ev is %x\n", driver->status.event_status));
	319	}
	320
	321	static void uctrl_get_external_status(struct uctrl_driver *driver)
	322	{
	323	struct uctrl_txn txn;
	324	u8 outbits[2];
	325	int i, v;
	326
	327	txn.opcode = READ_EXTERNAL_STATUS;
	328	txn.inbits = 0;
	329	txn.outbits = 2;
	330	txn.inbuf = NULL;
	331	txn.outbuf = outbits;
	332
	333	uctrl_do_txn(driver, &txn);
	334
	335	dprintk(("bytes %x %x\n", (outbits[0] & 0xff), (outbits[1] & 0xff)));
	336	driver->status.external_status =
	337	((outbits[0] * 256) + (outbits[1]));
	338	dprintk(("ex is %x\n", driver->status.external_status));
	339	v = driver->status.external_status;
	340	for (i = 0; v != 0; i++, v >>= 1) {
	341	if (v & 1) {
	342	dprintk(("%s%s", " ", uctrl_extstatus[i]));
	343	}
	344	}
	345	dprintk(("\n"));
	346
	347	}
	348
	349	static int uctrl_probe(struct platform_device *op)
	350	{
	351	struct uctrl_driver *p;
	352	int err = -ENOMEM;
	353
	354	p = kzalloc(sizeof(*p), GFP_KERNEL);
	355	if (!p) {
	356	printk(KERN_ERR "uctrl: Unable to allocate device struct.\n");
	357	goto out;
	358	}
	359
	360	p->regs = of_ioremap(&op->resource[0], 0,
	361	resource_size(&op->resource[0]),
	362	"uctrl");
	363	if (!p->regs) {
	364	printk(KERN_ERR "uctrl: Unable to map registers.\n");
	365	goto out_free;
	366	}
	367
	368	p->irq = op->archdata.irqs[0];
	369	err = request_irq(p->irq, uctrl_interrupt, 0, "uctrl", p);
	370	if (err) {
	371	printk(KERN_ERR "uctrl: Unable to register irq.\n");
	372	goto out_iounmap;
	373	}
	374
	375	err = misc_register(&uctrl_dev);
	376	if (err) {
	377	printk(KERN_ERR "uctrl: Unable to register misc device.\n");
	378	goto out_free_irq;
	379	}
	380
	381	sbus_writel(UCTRL_INTR_RXNE_REQ\|UCTRL_INTR_RXNE_MSK, &p->regs->uctrl_intr);
	382	printk(KERN_INFO "%pOF: uctrl regs[0x%p] (irq %d)\n",
	383	op->dev.of_node, p->regs, p->irq);
	384	uctrl_get_event_status(p);
	385	uctrl_get_external_status(p);
	386
	387	dev_set_drvdata(&op->dev, p);
	388	global_driver = p;
	389
	390	out:
	391	return err;
	392
	393	out_free_irq:
	394	free_irq(p->irq, p);
	395
	396	out_iounmap:
	397	of_iounmap(&op->resource[0], p->regs, resource_size(&op->resource[0]));
	398
	399	out_free:
	400	kfree(p);
	401	goto out;
	402	}
	403
	404	static int uctrl_remove(struct platform_device *op)
	405	{
	406	struct uctrl_driver *p = dev_get_drvdata(&op->dev);
	407
	408	if (p) {
	409	misc_deregister(&uctrl_dev);
	410	free_irq(p->irq, p);
	411	of_iounmap(&op->resource[0], p->regs, resource_size(&op->resource[0]));
	412	kfree(p);
	413	}
	414	return 0;
	415	}
	416
	417	static const struct of_device_id uctrl_match[] = {
	418	{
	419	.name = "uctrl",
	420	},
	421	{},
	422	};
	423	MODULE_DEVICE_TABLE(of, uctrl_match);
	424
	425	static struct platform_driver uctrl_driver = {
	426	.driver = {
	427	.name = "uctrl",
	428	.of_match_table = uctrl_match,
	429	},
	430	.probe = uctrl_probe,
	431	.remove = uctrl_remove,
	432	};
	433
	434
	435	module_platform_driver(uctrl_driver);
	436
	437	MODULE_LICENSE("GPL");