Release 4.7 drivers/i2c/busses/scx200_acb.c

/*
    Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>

    National Semiconductor SCx200 ACCESS.bus support
    Also supports the AMD CS5535 and AMD CS5536

    Based on i2c-keywest.c which is:
        Copyright (c) 2001 Benjamin Herrenschmidt <benh@kernel.crashing.org>
        Copyright (c) 2000 Philip Edelbrock <phil@stimpy.netroedge.com>

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.
*/


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/io.h>

#include <linux/scx200.h>

MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
MODULE_DESCRIPTION("NatSemi SCx200 ACCESS.bus Driver");
MODULE_ALIAS("platform:cs5535-smb");
MODULE_LICENSE("GPL");


#define MAX_DEVICES 4

static int base[MAX_DEVICES] = { 0x820, 0x840 };
module_param_array(base, int, NULL, 0);
MODULE_PARM_DESC(base, "Base addresses for the ACCESS.bus controllers");


#define POLL_TIMEOUT	(HZ/5)


enum scx200_acb_state {
	
state_idle,
	
state_address,
	
state_command,
	
state_repeat_start,
	
state_quick,
	
state_read,
	
state_write,
};


static const char *scx200_acb_state_name[] = {
	"idle",
	"address",
	"command",
	"repeat_start",
	"quick",
	"read",
	"write",
};

/* Physical interface */

struct scx200_acb_iface {
	
struct scx200_acb_iface *next;
	
struct i2c_adapter adapter;
	
unsigned base;
	
struct mutex mutex;

	/* State machine data */
	
enum scx200_acb_state state;
	
int result;
	
u8 address_byte;
	
u8 command;
	
u8 *ptr;
	
char needs_reset;
	
unsigned len;
};

/* Register Definitions */

#define ACBSDA		(iface->base + 0)

#define ACBST		(iface->base + 1)

#define    ACBST_SDAST		0x40 
/* SDA Status */

#define    ACBST_BER		0x20

#define    ACBST_NEGACK		0x10 
/* Negative Acknowledge */

#define    ACBST_STASTR		0x08 
/* Stall After Start */

#define    ACBST_MASTER		0x02

#define ACBCST		(iface->base + 2)

#define    ACBCST_BB		0x02

#define ACBCTL1		(iface->base + 3)

#define    ACBCTL1_STASTRE	0x80

#define    ACBCTL1_NMINTE	0x40

#define    ACBCTL1_ACK		0x10

#define    ACBCTL1_STOP		0x02

#define    ACBCTL1_START	0x01

#define ACBADDR		(iface->base + 4)

#define ACBCTL2		(iface->base + 5)

#define    ACBCTL2_ENABLE	0x01

/************************************************************************/



static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
{
	const char *errmsg;

	dev_dbg(&iface->adapter.dev, "state %s, status = 0x%02x\n",
		scx200_acb_state_name[iface->state], status);

	if (status & ACBST_BER) {
		errmsg = "bus error";
		goto error;
	}
	if (!(status & ACBST_MASTER)) {
		errmsg = "not master";
		goto error;
	}
	if (status & ACBST_NEGACK) {
		dev_dbg(&iface->adapter.dev, "negative ack in state %s\n",
			scx200_acb_state_name[iface->state]);

		iface->state = state_idle;
		iface->result = -ENXIO;

		outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
		outb(ACBST_STASTR | ACBST_NEGACK, ACBST);

		/* Reset the status register */
		outb(0, ACBST);
		return;
	}

	switch (iface->state) {
	case state_idle:
		dev_warn(&iface->adapter.dev, "interrupt in idle state\n");
		break;

	case state_address:
		/* Do a pointer write first */
		outb(iface->address_byte & ~1, ACBSDA);

		iface->state = state_command;
		break;

	case state_command:
		outb(iface->command, ACBSDA);

		if (iface->address_byte & 1)
			iface->state = state_repeat_start;
		else
			iface->state = state_write;
		break;

	case state_repeat_start:
		outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);
		/* fallthrough */

	case state_quick:
		if (iface->address_byte & 1) {
			if (iface->len == 1)
				outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
			else
				outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
			outb(iface->address_byte, ACBSDA);

			iface->state = state_read;
		} else {
			outb(iface->address_byte, ACBSDA);

			iface->state = state_write;
		}
		break;

	case state_read:
		/* Set ACK if _next_ byte will be the last one */
		if (iface->len == 2)
			outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
		else
			outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);

		if (iface->len == 1) {
			iface->result = 0;
			iface->state = state_idle;
			outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
		}

		*iface->ptr++ = inb(ACBSDA);
		--iface->len;

		break;

	case state_write:
		if (iface->len == 0) {
			iface->result = 0;
			iface->state = state_idle;
			outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
			break;
		}

		outb(*iface->ptr++, ACBSDA);
		--iface->len;

		break;
	}

	return;

 error:
	dev_err(&iface->adapter.dev,
		"%s in state %s (addr=0x%02x, len=%d, status=0x%02x)\n", errmsg,
		scx200_acb_state_name[iface->state], iface->address_byte,
		iface->len, status);

	iface->state = state_idle;
	iface->result = -EIO;
	iface->needs_reset = 1;
}

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2
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greg kroah-hartman
greg kroah-hartman
25
4.83%
2
25.00%
thomas andrews
thomas andrews
19
3.67%
1
12.50%
willy tarreau
willy tarreau
11
2.12%
1
12.50%
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jordan crouse
8
1.54%
1
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518
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8
100.00%



static void scx200_acb_poll(struct scx200_acb_iface *iface)
{
	u8 status;
	unsigned long timeout;

	timeout = jiffies + POLL_TIMEOUT;
	while (1) {
		status = inb(ACBST);

		/* Reset the status register to avoid the hang */
		outb(0, ACBST);

		if ((status & (ACBST_SDAST|ACBST_BER|ACBST_NEGACK)) != 0) {
			scx200_acb_machine(iface, status);
			return;
		}
		if (time_after(jiffies, timeout))
			break;
		cpu_relax();
		cond_resched();
	}

	dev_err(&iface->adapter.dev, "timeout in state %s\n",
		scx200_acb_state_name[iface->state]);

	iface->state = state_idle;
	iface->result = -EIO;
	iface->needs_reset = 1;
}

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28.00%
2
40.00%
david woodhouse
david woodhouse
15
12.00%
1
20.00%
jordan crouse
jordan crouse
8
6.40%
1
20.00%
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125
100.00%
5
100.00%



static void scx200_acb_reset(struct scx200_acb_iface *iface)
{
	/* Disable the ACCESS.bus device and Configure the SCL
           frequency: 16 clock cycles */
	outb(0x70, ACBCTL2);
	/* Polling mode */
	outb(0, ACBCTL1);
	/* Disable slave address */
	outb(0, ACBADDR);
	/* Enable the ACCESS.bus device */
	outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2);
	/* Free STALL after START */
	outb(inb(ACBCTL1) & ~(ACBCTL1_STASTRE | ACBCTL1_NMINTE), ACBCTL1);
	/* Send a STOP */
	outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
	/* Clear BER, NEGACK and STASTR bits */
	outb(ACBST_BER | ACBST_NEGACK | ACBST_STASTR, ACBST);
	/* Clear BB bit */
	outb(inb(ACBCST) | ACBCST_BB, ACBCST);
}

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1
50.00%
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104
100.00%
2
100.00%



static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
				 u16 address, unsigned short flags,
				 char rw, u8 command, int size,
				 union i2c_smbus_data *data)
{
	struct scx200_acb_iface *iface = i2c_get_adapdata(adapter);
	int len;
	u8 *buffer;
	u16 cur_word;
	int rc;

	switch (size) {
	case I2C_SMBUS_QUICK:
		len = 0;
		buffer = NULL;
		break;

	case I2C_SMBUS_BYTE:
		len = 1;
		buffer = rw ? &data->byte : &command;
		break;

	case I2C_SMBUS_BYTE_DATA:
		len = 1;
		buffer = &data->byte;
		break;

	case I2C_SMBUS_WORD_DATA:
		len = 2;
		cur_word = cpu_to_le16(data->word);
		buffer = (u8 *)&cur_word;
		break;

	case I2C_SMBUS_I2C_BLOCK_DATA:
		len = data->block[0];
		if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
			return -EINVAL;
		buffer = &data->block[1];
		break;

	default:
		return -EINVAL;
	}

	dev_dbg(&adapter->dev,
		"size=%d, address=0x%x, command=0x%x, len=%d, read=%d\n",
		size, address, command, len, rw);

	if (!len && rw == I2C_SMBUS_READ) {
		dev_dbg(&adapter->dev, "zero length read\n");
		return -EINVAL;
	}

	mutex_lock(&iface->mutex);

	iface->address_byte = (address << 1) | rw;
	iface->command = command;
	iface->ptr = buffer;
	iface->len = len;
	iface->result = -EINVAL;
	iface->needs_reset = 0;

	outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);

	if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE)
		iface->state = state_quick;
	else
		iface->state = state_address;

	while (iface->state != state_idle)
		scx200_acb_poll(iface);

	if (iface->needs_reset)
		scx200_acb_reset(iface);

	rc = iface->result;

	mutex_unlock(&iface->mutex);

	if (rc == 0 && size == I2C_SMBUS_WORD_DATA && rw == I2C_SMBUS_READ)
		data->word = le16_to_cpu(cur_word);

#ifdef DEBUG
	dev_dbg(&adapter->dev, "transfer done, result: %d", rc);
	if (buffer) {
		int i;
		printk(" data:");
		for (i = 0; i < len; ++i)
			printk(" %02x", buffer[i]);
	}
	printk("\n");
#endif

	return rc;
}

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4.88%
3
33.33%
ben gardner
ben gardner
20
4.65%
2
22.22%
greg kroah-hartman
greg kroah-hartman
11
2.56%
3
33.33%
Total
430
100.00%
9
100.00%



static u32 scx200_acb_func(struct i2c_adapter *adapter)
{
	return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
	       I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
	       I2C_FUNC_SMBUS_I2C_BLOCK;
}

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4.55%
1
50.00%
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22
100.00%
2
100.00%

/* For now, we only handle combined mode (smbus) */

static const struct i2c_algorithm scx200_acb_algorithm = {
	.smbus_xfer	= scx200_acb_smbus_xfer,
	.functionality	= scx200_acb_func,
};


static struct scx200_acb_iface *scx200_acb_list;
static DEFINE_MUTEX(scx200_acb_list_mutex);



static int scx200_acb_probe(struct scx200_acb_iface *iface)
{
	u8 val;

	/* Disable the ACCESS.bus device and Configure the SCL
           frequency: 16 clock cycles */
	outb(0x70, ACBCTL2);

	if (inb(ACBCTL2) != 0x70) {
		pr_debug("ACBCTL2 readback failed\n");
		return -ENXIO;
	}

	outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1);

	val = inb(ACBCTL1);
	if (val) {
		pr_debug("disabled, but ACBCTL1=0x%02x\n", val);
		return -ENXIO;
	}

	outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2);

	outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1);

	val = inb(ACBCTL1);
	if ((val & ACBCTL1_NMINTE) != ACBCTL1_NMINTE) {
		pr_debug("enabled, but NMINTE won't be set, ACBCTL1=0x%02x\n",
			 val);
		return -ENXIO;
	}

	return 0;
}

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2.96%
2
40.00%
jim cromie
jim cromie
3
2.22%
1
20.00%
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adrian bunk
1
0.74%
1
20.00%
Total
135
100.00%
5
100.00%



static struct scx200_acb_iface *scx200_create_iface(const char *text,
		struct device *dev, int index)
{
	struct scx200_acb_iface *iface;
	struct i2c_adapter *adapter;

	iface = kzalloc(sizeof(*iface), GFP_KERNEL);
	if (!iface)
		return NULL;

	adapter = &iface->adapter;
	i2c_set_adapdata(adapter, iface);
	snprintf(adapter->name, sizeof(adapter->name), "%s ACB%d", text, index);
	adapter->owner = THIS_MODULE;
	adapter->algo = &scx200_acb_algorithm;
	adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
	adapter->dev.parent = dev;

	mutex_init(&iface->mutex);

	return iface;
}

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jean delvare
18
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4
30.77%
jordan crouse
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8
6.35%
1
7.69%
david brownell
david brownell
6
4.76%
1
7.69%
greg kroah-hartman
greg kroah-hartman
6
4.76%
2
15.38%
christoph hellwig
christoph hellwig
6
4.76%
1
7.69%
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ben gardner
3
2.38%
1
7.69%
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deepak saxena
1
0.79%
1
7.69%
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100.00%
13
100.00%



static int scx200_acb_create(struct scx200_acb_iface *iface)
{
	struct i2c_adapter *adapter;
	int rc;

	adapter = &iface->adapter;

	rc = scx200_acb_probe(iface);
	if (rc) {
		pr_warn("probe failed\n");
		return rc;
	}

	scx200_acb_reset(iface);

	if (i2c_add_adapter(adapter) < 0) {
		pr_err("failed to register\n");
		return -ENODEV;
	}

	if (!adapter->dev.parent) {
		/* If there's no dev, we're tracking (ISA) ifaces manually */
		mutex_lock(&scx200_acb_list_mutex);
		iface->next = scx200_acb_list;
		scx200_acb_list = iface;
		mutex_unlock(&scx200_acb_list_mutex);
	}

	return 0;
}

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14.29%
andres salomon
andres salomon
12
11.01%
1
14.29%
ben gardner
ben gardner
8
7.34%
1
14.29%
jim cromie
jim cromie
6
5.50%
1
14.29%
matthias kaehlcke
matthias kaehlcke
2
1.83%
1
14.29%
bill pemberton
bill pemberton
1
0.92%
1
14.29%
Total
109
100.00%
7
100.00%



static struct scx200_acb_iface *scx200_create_dev(const char *text,
		unsigned long base, int index, struct device *dev)
{
	struct scx200_acb_iface *iface;
	int rc;

	iface = scx200_create_iface(text, dev, index);

	if (iface == NULL)
		return NULL;

	if (!request_region(base, 8, iface->adapter.name)) {
		pr_err("can't allocate io 0x%lx-0x%lx\n", base, base + 8 - 1);
		goto errout_free;
	}

	iface->base = base;
	rc = scx200_acb_create(iface);

	if (rc == 0)
		return iface;

	release_region(base, 8);
 errout_free:
	kfree(iface);
	return NULL;
}

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ben gardner
ben gardner
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15.87%
1
16.67%
jim cromie
jim cromie
7
5.56%
1
16.67%
jean delvare
jean delvare
2
1.59%
1
16.67%
jeff garzik
jeff garzik
2
1.59%
1
16.67%
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126
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6
100.00%



static int scx200_probe(struct platform_device *pdev)
{
	struct scx200_acb_iface *iface;
	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (!res) {
		dev_err(&pdev->dev, "can't fetch device resource info\n");
		return -ENODEV;
	}

	iface = scx200_create_dev("CS5535", res->start, 0, &pdev->dev);
	if (!iface)
		return -EIO;

	dev_info(&pdev->dev, "SCx200 device '%s' registered\n",
			iface->adapter.name);
	platform_set_drvdata(pdev, iface);

	return 0;
}

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christer weinigel
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1
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static void scx200_cleanup_iface(struct scx200_acb_iface *iface)
{
	i2c_del_adapter(&iface->adapter);
	release_region(iface->base, 8);
	kfree(iface);
}

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static int scx200_remove(struct platform_device *pdev)
{
	struct scx200_acb_iface *iface;

	iface = platform_get_drvdata(pdev);
	scx200_cleanup_iface(iface);

	return 0;
}

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static struct platform_driver scx200_pci_driver = {
	.driver = {
		.name = "cs5535-smb",
        },
	.probe = scx200_probe,
	.remove = scx200_remove,
};


static const struct pci_device_id scx200_isa[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
	{ 0, }
};



static __init void scx200_scan_isa(void)
{
	int i;

	if (!pci_dev_present(scx200_isa))
		return;

	for (i = 0; i < MAX_DEVICES; ++i) {
		if (base[i] == 0)
			continue;

		/* XXX: should we care about failures? */
		scx200_create_dev("SCx200", base[i], i, NULL);
	}
}

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Commits
CommitProp
christer weinigel
christer weinigel
39
63.93%
1
20.00%
andres salomon
andres salomon
13
21.31%
1
20.00%
jordan crouse
jordan crouse
5
8.20%
1
20.00%
ben gardner
ben gardner
2
3.28%
1
20.00%
jean delvare
jean delvare
2
3.28%
1
20.00%
Total
61
100.00%
5
100.00%



static int __init scx200_acb_init(void)
{
	pr_debug("NatSemi SCx200 ACCESS.bus Driver\n");

	/* First scan for ISA-based devices */
	scx200_scan_isa();	/* XXX: should we care about errors? */

	/* If at least one bus was created, init must succeed */
	if (scx200_acb_list)
		return 0;

	/* No ISA devices; register the platform driver for PCI-based devices */
	return platform_driver_register(&scx200_pci_driver);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jordan crouse
jordan crouse
10
28.57%
1
14.29%
jean delvare
jean delvare
8
22.86%
1
14.29%
andres salomon
andres salomon
8
22.86%
1
14.29%
ben gardner
ben gardner
4
11.43%
1
14.29%
christer weinigel
christer weinigel
3
8.57%
1
14.29%
harvey yang
harvey yang
1
2.86%
1
14.29%
jim cromie
jim cromie
1
2.86%
1
14.29%
Total
35
100.00%
7
100.00%



static void __exit scx200_acb_cleanup(void)
{
	struct scx200_acb_iface *iface;

	platform_driver_unregister(&scx200_pci_driver);

	mutex_lock(&scx200_acb_list_mutex);
	while ((iface = scx200_acb_list) != NULL) {
		scx200_acb_list = iface->next;
		mutex_unlock(&scx200_acb_list_mutex);

		scx200_cleanup_iface(iface);

		mutex_lock(&scx200_acb_list_mutex);
	}
	mutex_unlock(&scx200_acb_list_mutex);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christer weinigel
christer weinigel
40
59.70%
1
20.00%
ben gardner
ben gardner
16
23.88%
1
20.00%
andres salomon
andres salomon
6
8.96%
1
20.00%
matthias kaehlcke
matthias kaehlcke
4
5.97%
1
20.00%
harvey yang
harvey yang
1
1.49%
1
20.00%
Total
67
100.00%
5
100.00%


module_init(scx200_acb_init);

module_exit(scx200_acb_cleanup);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
christer weinigel
christer weinigel
1540
64.33%
1
2.17%
jordan crouse
jordan crouse
210
8.77%
2
4.35%
andres salomon
andres salomon
209
8.73%
1
2.17%
ben gardner
ben gardner
183
7.64%
6
13.04%
jean delvare
jean delvare
59
2.46%
9
19.57%
greg kroah-hartman
greg kroah-hartman
47
1.96%
5
10.87%
bill pemberton
bill pemberton
26
1.09%
1
2.17%
jim cromie
jim cromie
24
1.00%
1
2.17%
thomas andrews
thomas andrews
19
0.79%
1
2.17%
david woodhouse
david woodhouse
15
0.63%
1
2.17%
willy tarreau
willy tarreau
11
0.46%
1
2.17%
matthias kaehlcke
matthias kaehlcke
7
0.29%
1
2.17%
jingoo han
jingoo han
6
0.25%
1
2.17%
christoph hellwig
christoph hellwig
6
0.25%
1
2.17%
david brownell
david brownell
6
0.25%
1
2.17%
art haas
art haas
4
0.17%
1
2.17%
tejun heo
tejun heo
3
0.13%
1
2.17%
nishanth aravamudan
nishanth aravamudan
3
0.13%
1
2.17%
adrian bunk
adrian bunk
3
0.13%
2
4.35%
harvey yang
harvey yang
3
0.13%
1
2.17%
dzianis kahanovich
dzianis kahanovich
2
0.08%
1
2.17%
jeff garzik
jeff garzik
2
0.08%
1
2.17%
andrew morton
andrew morton
2
0.08%
1
2.17%
wolfram sang
wolfram sang
1
0.04%
1
2.17%
h hartley sweeten
h hartley sweeten
1
0.04%
1
2.17%
rusty russell
rusty russell
1
0.04%
1
2.17%
deepak saxena
deepak saxena
1
0.04%
1
2.17%
axel lin
axel lin
0.00%
0
0.00%
Total
2394
100.00%
46
100.00%
  
Directory: drivers/i2c/busses

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