[deliverable/linux.git] / drivers / hwmon / i5k_amb.c

/*
 * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
 * temperature sensors
 * Copyright (C) 2007 IBM
 *
 * Author: Darrick J. Wong <djwong@us.ibm.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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/log2.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#define DRVNAME "i5k_amb"

#define I5K_REG_AMB_BASE_ADDR		0x48
#define I5K_REG_AMB_LEN_ADDR		0x50
#define I5K_REG_CHAN0_PRESENCE_ADDR	0x64
#define I5K_REG_CHAN1_PRESENCE_ADDR	0x66

#define AMB_REG_TEMP_MIN_ADDR		0x80
#define AMB_REG_TEMP_MID_ADDR		0x81
#define AMB_REG_TEMP_MAX_ADDR		0x82
#define AMB_REG_TEMP_STATUS_ADDR	0x84
#define AMB_REG_TEMP_ADDR		0x85

#define AMB_CONFIG_SIZE			2048
#define AMB_FUNC_3_OFFSET		768

static unsigned long amb_reg_temp_status(unsigned int amb)
{
	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
	       AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp_min(unsigned int amb)
{
	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
	       AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp_mid(unsigned int amb)
{
	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
	       AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp_max(unsigned int amb)
{
	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
	       AMB_CONFIG_SIZE * amb;
}

static unsigned long amb_reg_temp(unsigned int amb)
{
	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
	       AMB_CONFIG_SIZE * amb;
}

#define MAX_MEM_CHANNELS		4
#define MAX_AMBS_PER_CHANNEL		16
#define MAX_AMBS			(MAX_MEM_CHANNELS * \
					 MAX_AMBS_PER_CHANNEL)
#define CHANNEL_SHIFT			4
#define DIMM_MASK			0xF
/*
 * Ugly hack: For some reason the highest bit is set if there
 * are _any_ DIMMs in the channel.  Attempting to read from
 * this "high-order" AMB results in a memory bus error, so
 * for now we'll just ignore that top bit, even though that
 * might prevent us from seeing the 16th DIMM in the channel.
 */
#define REAL_MAX_AMBS_PER_CHANNEL	15
#define KNOBS_PER_AMB			6

static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
{
	return byte_num * MAX_AMBS_PER_CHANNEL + bit;
}

#define AMB_SYSFS_NAME_LEN		16
struct i5k_device_attribute {
	struct sensor_device_attribute s_attr;
	char name[AMB_SYSFS_NAME_LEN];
};

struct i5k_amb_data {
	struct device *hwmon_dev;

	unsigned long amb_base;
	unsigned long amb_len;
	u16 amb_present[MAX_MEM_CHANNELS];
	void __iomem *amb_mmio;
	struct i5k_device_attribute *attrs;
	unsigned int num_attrs;
};

static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
			 char *buf)
{
	return sprintf(buf, "%s\n", DRVNAME);
}


static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static struct platform_device *amb_pdev;

static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
{
	return ioread8(data->amb_mmio + offset);
}

static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
			   u8 val)
{
	iowrite8(val, data->amb_mmio + offset);
}

static ssize_t show_amb_alarm(struct device *dev,
			     struct device_attribute *devattr,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);

	if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
	     (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
		return sprintf(buf, "1\n");
	else
		return sprintf(buf, "0\n");
}

static ssize_t store_amb_min(struct device *dev,
			     struct device_attribute *devattr,
			     const char *buf,
			     size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;

	if (temp > 255)
		temp = 255;

	amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
	return count;
}

static ssize_t store_amb_mid(struct device *dev,
			     struct device_attribute *devattr,
			     const char *buf,
			     size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;

	if (temp > 255)
		temp = 255;

	amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
	return count;
}

static ssize_t store_amb_max(struct device *dev,
			     struct device_attribute *devattr,
			     const char *buf,
			     size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;

	if (temp > 255)
		temp = 255;

	amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
	return count;
}

static ssize_t show_amb_min(struct device *dev,
			     struct device_attribute *devattr,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n",
		500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
}

static ssize_t show_amb_mid(struct device *dev,
			     struct device_attribute *devattr,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n",
		500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
}

static ssize_t show_amb_max(struct device *dev,
			     struct device_attribute *devattr,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n",
		500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
}

static ssize_t show_amb_temp(struct device *dev,
			     struct device_attribute *devattr,
			     char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i5k_amb_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n",
		500 * amb_read_byte(data, amb_reg_temp(attr->index)));
}

static ssize_t show_label(struct device *dev,
			  struct device_attribute *devattr,
			  char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

	return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
		       attr->index & DIMM_MASK);
}

static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev)
{
	int i, j, k, d = 0;
	u16 c;
	int res = 0;
	int num_ambs = 0;
	struct i5k_amb_data *data = platform_get_drvdata(pdev);

	/* Count the number of AMBs found */
	/* ignore the high-order bit, see "Ugly hack" comment above */
	for (i = 0; i < MAX_MEM_CHANNELS; i++)
		num_ambs += hweight16(data->amb_present[i] & 0x7fff);

	/* Set up sysfs stuff */
	data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
				GFP_KERNEL);
	if (!data->attrs)
		return -ENOMEM;
	data->num_attrs = 0;

	for (i = 0; i < MAX_MEM_CHANNELS; i++) {
		c = data->amb_present[i];
		for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
			struct i5k_device_attribute *iattr;

			k = amb_num_from_reg(i, j);
			if (!(c & 0x1))
				continue;
			d++;

			/* sysfs label */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_label", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
			iattr->s_attr.dev_attr.show = show_label;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;

			/* Temperature sysfs knob */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_input", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
			iattr->s_attr.dev_attr.show = show_amb_temp;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;

			/* Temperature min sysfs knob */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_min", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
			iattr->s_attr.dev_attr.show = show_amb_min;
			iattr->s_attr.dev_attr.store = store_amb_min;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;

			/* Temperature mid sysfs knob */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_mid", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
			iattr->s_attr.dev_attr.show = show_amb_mid;
			iattr->s_attr.dev_attr.store = store_amb_mid;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;

			/* Temperature max sysfs knob */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_max", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO;
			iattr->s_attr.dev_attr.show = show_amb_max;
			iattr->s_attr.dev_attr.store = store_amb_max;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;

			/* Temperature alarm sysfs knob */
			iattr = data->attrs + data->num_attrs;
			snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
				 "temp%d_alarm", d);
			iattr->s_attr.dev_attr.attr.name = iattr->name;
			iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
			iattr->s_attr.dev_attr.show = show_amb_alarm;
			iattr->s_attr.index = k;
			sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
			res = device_create_file(&pdev->dev,
						 &iattr->s_attr.dev_attr);
			if (res)
				goto exit_remove;
			data->num_attrs++;
		}
	}

	res = device_create_file(&pdev->dev, &dev_attr_name);
	if (res)
		goto exit_remove;

	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	if (IS_ERR(data->hwmon_dev)) {
		res = PTR_ERR(data->hwmon_dev);
		goto exit_remove;
	}

	return res;

exit_remove:
	device_remove_file(&pdev->dev, &dev_attr_name);
	for (i = 0; i < data->num_attrs; i++)
		device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
	kfree(data->attrs);

	return res;
}

static int __devinit i5k_amb_add(void)
{
	int res = -ENODEV;

	/* only ever going to be one of these */
	amb_pdev = platform_device_alloc(DRVNAME, 0);
	if (!amb_pdev)
		return -ENOMEM;

	res = platform_device_add(amb_pdev);
	if (res)
		goto err;
	return 0;

err:
	platform_device_put(amb_pdev);
	return res;
}

static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data,
					    unsigned long devid)
{
	struct pci_dev *pcidev;
	u32 val32;
	int res = -ENODEV;

	/* Find AMB register memory space */
	pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
				devid,
				NULL);
	if (!pcidev)
		return -ENODEV;

	if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
		goto out;
	data->amb_base = val32;

	if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
		goto out;
	data->amb_len = val32;

	/* Is it big enough? */
	if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
		dev_err(&pcidev->dev, "AMB region too small!\n");
		goto out;
	}

	res = 0;
out:
	pci_dev_put(pcidev);
	return res;
}

static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
{
	struct pci_dev *pcidev;
	u16 val16;
	int res = -ENODEV;

	/* Copy the DIMM presence map for these two channels */
	pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
	if (!pcidev)
		return -ENODEV;

	if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
		goto out;
	amb_present[0] = val16;

	if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
		goto out;
	amb_present[1] = val16;

	res = 0;

out:
	pci_dev_put(pcidev);
	return res;
}

static struct {
	unsigned long err;
	unsigned long fbd0;
} chipset_ids[] __devinitdata  = {
	{ PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
	{ PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
	{ 0, 0 }
};

#ifdef MODULE
static struct pci_device_id i5k_amb_ids[] __devinitdata = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
#endif

static int __devinit i5k_amb_probe(struct platform_device *pdev)
{
	struct i5k_amb_data *data;
	struct resource *reso;
	int i, res;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	/* Figure out where the AMB registers live */
	i = 0;
	do {
		res = i5k_find_amb_registers(data, chipset_ids[i].err);
		if (res == 0)
			break;
		i++;
	} while (chipset_ids[i].err);

	if (res)
		goto err;

	/* Copy the DIMM presence map for the first two channels */
	res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
	if (res)
		goto err;

	/* Copy the DIMM presence map for the optional second two channels */
	i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);

	/* Set up resource regions */
	reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
	if (!reso) {
		res = -EBUSY;
		goto err;
	}

	data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
	if (!data->amb_mmio) {
		res = -EBUSY;
		goto err_map_failed;
	}

	platform_set_drvdata(pdev, data);

	res = i5k_amb_hwmon_init(pdev);
	if (res)
		goto err_init_failed;

	return res;

err_init_failed:
	iounmap(data->amb_mmio);
	platform_set_drvdata(pdev, NULL);
err_map_failed:
	release_mem_region(data->amb_base, data->amb_len);
err:
	kfree(data);
	return res;
}

static int __devexit i5k_amb_remove(struct platform_device *pdev)
{
	int i;
	struct i5k_amb_data *data = platform_get_drvdata(pdev);

	hwmon_device_unregister(data->hwmon_dev);
	device_remove_file(&pdev->dev, &dev_attr_name);
	for (i = 0; i < data->num_attrs; i++)
		device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
	kfree(data->attrs);
	iounmap(data->amb_mmio);
	release_mem_region(data->amb_base, data->amb_len);
	platform_set_drvdata(pdev, NULL);
	kfree(data);
	return 0;
}

static struct platform_driver i5k_amb_driver = {
	.driver = {
		.owner = THIS_MODULE,
		.name = DRVNAME,
	},
	.probe = i5k_amb_probe,
	.remove = __devexit_p(i5k_amb_remove),
};

static int __init i5k_amb_init(void)
{
	int res;

	res = platform_driver_register(&i5k_amb_driver);
	if (res)
		return res;

	res = i5k_amb_add();
	if (res)
		platform_driver_unregister(&i5k_amb_driver);

	return res;
}

static void __exit i5k_amb_exit(void)
{
	platform_device_unregister(amb_pdev);
	platform_driver_unregister(&i5k_amb_driver);
}

MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
MODULE_LICENSE("GPL");

module_init(i5k_amb_init);
module_exit(i5k_amb_exit);
Commit	Line	Data
298c7524 DW	1	/*
	2	* A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
	3	* temperature sensors
	4	* Copyright (C) 2007 IBM
	5	*
	6	* Author: Darrick J. Wong <djwong@us.ibm.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/jiffies.h>
	25	#include <linux/hwmon.h>
	26	#include <linux/hwmon-sysfs.h>
	27	#include <linux/err.h>
	28	#include <linux/mutex.h>
	29	#include <linux/delay.h>
	30	#include <linux/log2.h>
	31	#include <linux/pci.h>
	32	#include <linux/platform_device.h>
5a0e3ad6	33	#include <linux/slab.h>
298c7524 DW	34
	35	#define DRVNAME "i5k_amb"
	36
	37	#define I5K_REG_AMB_BASE_ADDR 0x48
	38	#define I5K_REG_AMB_LEN_ADDR 0x50
	39	#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
	40	#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
	41
	42	#define AMB_REG_TEMP_MIN_ADDR 0x80
	43	#define AMB_REG_TEMP_MID_ADDR 0x81
	44	#define AMB_REG_TEMP_MAX_ADDR 0x82
	45	#define AMB_REG_TEMP_STATUS_ADDR 0x84
	46	#define AMB_REG_TEMP_ADDR 0x85
	47
	48	#define AMB_CONFIG_SIZE 2048
	49	#define AMB_FUNC_3_OFFSET 768
	50
59a030a9 DW	51	static unsigned long amb_reg_temp_status(unsigned int amb)
	52	{
	53	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
	54	AMB_CONFIG_SIZE * amb;
	55	}
	56
	57	static unsigned long amb_reg_temp_min(unsigned int amb)
	58	{
	59	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
	60	AMB_CONFIG_SIZE * amb;
	61	}
	62
	63	static unsigned long amb_reg_temp_mid(unsigned int amb)
	64	{
	65	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
	66	AMB_CONFIG_SIZE * amb;
	67	}
	68
	69	static unsigned long amb_reg_temp_max(unsigned int amb)
	70	{
	71	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
	72	AMB_CONFIG_SIZE * amb;
	73	}
	74
	75	static unsigned long amb_reg_temp(unsigned int amb)
	76	{
	77	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
	78	AMB_CONFIG_SIZE * amb;
	79	}
298c7524 DW	80
	81	#define MAX_MEM_CHANNELS 4
	82	#define MAX_AMBS_PER_CHANNEL 16
	83	#define MAX_AMBS (MAX_MEM_CHANNELS * \
	84	MAX_AMBS_PER_CHANNEL)
963d96b5 DW	85	#define CHANNEL_SHIFT 4
963d96b5 DW	86	#define DIMM_MASK 0xF
298c7524 DW	87	/*
	88	* Ugly hack: For some reason the highest bit is set if there
	89	* are _any_ DIMMs in the channel. Attempting to read from
	90	* this "high-order" AMB results in a memory bus error, so
	91	* for now we'll just ignore that top bit, even though that
	92	* might prevent us from seeing the 16th DIMM in the channel.
	93	*/
	94	#define REAL_MAX_AMBS_PER_CHANNEL 15
963d96b5	95	#define KNOBS_PER_AMB 6
298c7524	96
59a030a9 DW	97	static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
	98	{
	99	return byte_num * MAX_AMBS_PER_CHANNEL + bit;
	100	}
298c7524 DW	101
	102	#define AMB_SYSFS_NAME_LEN 16
	103	struct i5k_device_attribute {
	104	struct sensor_device_attribute s_attr;
	105	char name[AMB_SYSFS_NAME_LEN];
	106	};
	107
	108	struct i5k_amb_data {
	109	struct device *hwmon_dev;
	110
	111	unsigned long amb_base;
	112	unsigned long amb_len;
	113	u16 amb_present[MAX_MEM_CHANNELS];
	114	void __iomem *amb_mmio;
	115	struct i5k_device_attribute *attrs;
	116	unsigned int num_attrs;
	117	};
	118
	119	static ssize_t show_name(struct device dev, struct device_attribute devattr,
	120	char *buf)
	121	{
	122	return sprintf(buf, "%s\n", DRVNAME);
	123	}
	124
	125
	126	static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
	127
	128	static struct platform_device *amb_pdev;
	129
	130	static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
	131	{
	132	return ioread8(data->amb_mmio + offset);
	133	}
	134
	135	static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
	136	u8 val)
	137	{
	138	iowrite8(val, data->amb_mmio + offset);
	139	}
	140
	141	static ssize_t show_amb_alarm(struct device *dev,
	142	struct device_attribute *devattr,
	143	char *buf)
	144	{
	145	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	146	struct i5k_amb_data *data = dev_get_drvdata(dev);
	147
59a030a9 DW	148	if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
59a030a9 DW	149	(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
298c7524 DW	150	return sprintf(buf, "1\n");
	151	else
	152	return sprintf(buf, "0\n");
	153	}
	154
	155	static ssize_t store_amb_min(struct device *dev,
	156	struct device_attribute *devattr,
	157	const char *buf,
	158	size_t count)
	159	{
	160	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	161	struct i5k_amb_data *data = dev_get_drvdata(dev);
	162	unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
	163
	164	if (temp > 255)
	165	temp = 255;
	166
59a030a9	167	amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
298c7524 DW	168	return count;
	169	}
	170
	171	static ssize_t store_amb_mid(struct device *dev,
	172	struct device_attribute *devattr,
	173	const char *buf,
	174	size_t count)
	175	{
	176	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	177	struct i5k_amb_data *data = dev_get_drvdata(dev);
	178	unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
	179
	180	if (temp > 255)
	181	temp = 255;
	182
59a030a9	183	amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
298c7524 DW	184	return count;
	185	}
	186
	187	static ssize_t store_amb_max(struct device *dev,
	188	struct device_attribute *devattr,
	189	const char *buf,
	190	size_t count)
	191	{
	192	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	193	struct i5k_amb_data *data = dev_get_drvdata(dev);
	194	unsigned long temp = simple_strtoul(buf, NULL, 10) / 500;
	195
	196	if (temp > 255)
	197	temp = 255;
	198
59a030a9	199	amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
298c7524 DW	200	return count;
	201	}
	202
	203	static ssize_t show_amb_min(struct device *dev,
	204	struct device_attribute *devattr,
	205	char *buf)
	206	{
	207	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	208	struct i5k_amb_data *data = dev_get_drvdata(dev);
	209	return sprintf(buf, "%d\n",
59a030a9	210	500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
298c7524 DW	211	}
	212
	213	static ssize_t show_amb_mid(struct device *dev,
	214	struct device_attribute *devattr,
	215	char *buf)
	216	{
	217	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	218	struct i5k_amb_data *data = dev_get_drvdata(dev);
	219	return sprintf(buf, "%d\n",
59a030a9	220	500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
298c7524 DW	221	}
	222
	223	static ssize_t show_amb_max(struct device *dev,
	224	struct device_attribute *devattr,
	225	char *buf)
	226	{
	227	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	228	struct i5k_amb_data *data = dev_get_drvdata(dev);
	229	return sprintf(buf, "%d\n",
59a030a9	230	500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
298c7524 DW	231	}
	232
	233	static ssize_t show_amb_temp(struct device *dev,
	234	struct device_attribute *devattr,
	235	char *buf)
	236	{
	237	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	238	struct i5k_amb_data *data = dev_get_drvdata(dev);
	239	return sprintf(buf, "%d\n",
59a030a9	240	500 * amb_read_byte(data, amb_reg_temp(attr->index)));
298c7524 DW	241	}
298c7524 DW	242
963d96b5 DW	243	static ssize_t show_label(struct device *dev,
	244	struct device_attribute *devattr,
	245	char *buf)
	246	{
	247	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	248
	249	return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
	250	attr->index & DIMM_MASK);
	251	}
	252
298c7524 DW	253	static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev)
	254	{
	255	int i, j, k, d = 0;
	256	u16 c;
	257	int res = 0;
	258	int num_ambs = 0;
	259	struct i5k_amb_data *data = platform_get_drvdata(pdev);
	260
	261	/* Count the number of AMBs found */
	262	/* ignore the high-order bit, see "Ugly hack" comment above */
	263	for (i = 0; i < MAX_MEM_CHANNELS; i++)
	264	num_ambs += hweight16(data->amb_present[i] & 0x7fff);
	265
	266	/* Set up sysfs stuff */
	267	data->attrs = kzalloc(sizeof(data->attrs) num_ambs * KNOBS_PER_AMB,
	268	GFP_KERNEL);
	269	if (!data->attrs)
	270	return -ENOMEM;
	271	data->num_attrs = 0;
	272
	273	for (i = 0; i < MAX_MEM_CHANNELS; i++) {
	274	c = data->amb_present[i];
	275	for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
	276	struct i5k_device_attribute *iattr;
	277
59a030a9	278	k = amb_num_from_reg(i, j);
298c7524 DW	279	if (!(c & 0x1))
	280	continue;
	281	d++;
	282
963d96b5 DW	283	/* sysfs label */
	284	iattr = data->attrs + data->num_attrs;
	285	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	286	"temp%d_label", d);
	287	iattr->s_attr.dev_attr.attr.name = iattr->name;
	288	iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
	289	iattr->s_attr.dev_attr.show = show_label;
	290	iattr->s_attr.index = k;
0e6c7870	291	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
963d96b5 DW	292	res = device_create_file(&pdev->dev,
	293	&iattr->s_attr.dev_attr);
	294	if (res)
	295	goto exit_remove;
	296	data->num_attrs++;
	297
298c7524 DW	298	/* Temperature sysfs knob */
	299	iattr = data->attrs + data->num_attrs;
	300	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	301	"temp%d_input", d);
	302	iattr->s_attr.dev_attr.attr.name = iattr->name;
	303	iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
	304	iattr->s_attr.dev_attr.show = show_amb_temp;
	305	iattr->s_attr.index = k;
0e6c7870	306	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298c7524 DW	307	res = device_create_file(&pdev->dev,
	308	&iattr->s_attr.dev_attr);
	309	if (res)
	310	goto exit_remove;
	311	data->num_attrs++;
	312
	313	/* Temperature min sysfs knob */
	314	iattr = data->attrs + data->num_attrs;
	315	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	316	"temp%d_min", d);
	317	iattr->s_attr.dev_attr.attr.name = iattr->name;
	318	iattr->s_attr.dev_attr.attr.mode = S_IWUSR \| S_IRUGO;
	319	iattr->s_attr.dev_attr.show = show_amb_min;
	320	iattr->s_attr.dev_attr.store = store_amb_min;
	321	iattr->s_attr.index = k;
0e6c7870	322	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298c7524 DW	323	res = device_create_file(&pdev->dev,
	324	&iattr->s_attr.dev_attr);
	325	if (res)
	326	goto exit_remove;
	327	data->num_attrs++;
	328
	329	/* Temperature mid sysfs knob */
	330	iattr = data->attrs + data->num_attrs;
	331	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	332	"temp%d_mid", d);
	333	iattr->s_attr.dev_attr.attr.name = iattr->name;
	334	iattr->s_attr.dev_attr.attr.mode = S_IWUSR \| S_IRUGO;
	335	iattr->s_attr.dev_attr.show = show_amb_mid;
	336	iattr->s_attr.dev_attr.store = store_amb_mid;
	337	iattr->s_attr.index = k;
0e6c7870	338	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298c7524 DW	339	res = device_create_file(&pdev->dev,
	340	&iattr->s_attr.dev_attr);
	341	if (res)
	342	goto exit_remove;
	343	data->num_attrs++;
	344
	345	/* Temperature max sysfs knob */
	346	iattr = data->attrs + data->num_attrs;
	347	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	348	"temp%d_max", d);
	349	iattr->s_attr.dev_attr.attr.name = iattr->name;
	350	iattr->s_attr.dev_attr.attr.mode = S_IWUSR \| S_IRUGO;
	351	iattr->s_attr.dev_attr.show = show_amb_max;
	352	iattr->s_attr.dev_attr.store = store_amb_max;
	353	iattr->s_attr.index = k;
0e6c7870	354	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298c7524 DW	355	res = device_create_file(&pdev->dev,
	356	&iattr->s_attr.dev_attr);
	357	if (res)
	358	goto exit_remove;
	359	data->num_attrs++;
	360
	361	/* Temperature alarm sysfs knob */
	362	iattr = data->attrs + data->num_attrs;
	363	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	364	"temp%d_alarm", d);
	365	iattr->s_attr.dev_attr.attr.name = iattr->name;
	366	iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
	367	iattr->s_attr.dev_attr.show = show_amb_alarm;
	368	iattr->s_attr.index = k;
0e6c7870	369	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298c7524 DW	370	res = device_create_file(&pdev->dev,
	371	&iattr->s_attr.dev_attr);
	372	if (res)
	373	goto exit_remove;
	374	data->num_attrs++;
	375	}
	376	}
	377
	378	res = device_create_file(&pdev->dev, &dev_attr_name);
	379	if (res)
	380	goto exit_remove;
	381
	382	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	383	if (IS_ERR(data->hwmon_dev)) {
	384	res = PTR_ERR(data->hwmon_dev);
	385	goto exit_remove;
	386	}
	387
	388	return res;
	389
	390	exit_remove:
	391	device_remove_file(&pdev->dev, &dev_attr_name);
	392	for (i = 0; i < data->num_attrs; i++)
	393	device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
	394	kfree(data->attrs);
	395
	396	return res;
	397	}
	398
	399	static int __devinit i5k_amb_add(void)
	400	{
	401	int res = -ENODEV;
	402
	403	/* only ever going to be one of these */
	404	amb_pdev = platform_device_alloc(DRVNAME, 0);
	405	if (!amb_pdev)
	406	return -ENOMEM;
	407
	408	res = platform_device_add(amb_pdev);
	409	if (res)
	410	goto err;
	411	return 0;
	412
	413	err:
	414	platform_device_put(amb_pdev);
	415	return res;
	416	}
	417
b8fdaf5a DW	418	static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data,
b8fdaf5a DW	419	unsigned long devid)
298c7524 DW	420	{
	421	struct pci_dev *pcidev;
	422	u32 val32;
	423	int res = -ENODEV;
	424
	425	/* Find AMB register memory space */
	426	pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
b8fdaf5a	427	devid,
298c7524 DW	428	NULL);
	429	if (!pcidev)
	430	return -ENODEV;
	431
	432	if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
	433	goto out;
	434	data->amb_base = val32;
	435
	436	if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
	437	goto out;
	438	data->amb_len = val32;
	439
	440	/* Is it big enough? */
	441	if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
	442	dev_err(&pcidev->dev, "AMB region too small!\n");
	443	goto out;
	444	}
	445
	446	res = 0;
	447	out:
	448	pci_dev_put(pcidev);
	449	return res;
	450	}
	451
	452	static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
	453	{
	454	struct pci_dev *pcidev;
	455	u16 val16;
	456	int res = -ENODEV;
	457
	458	/* Copy the DIMM presence map for these two channels */
	459	pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
	460	if (!pcidev)
	461	return -ENODEV;
	462
	463	if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
	464	goto out;
	465	amb_present[0] = val16;
	466
	467	if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
	468	goto out;
	469	amb_present[1] = val16;
	470
	471	res = 0;
	472
	473	out:
	474	pci_dev_put(pcidev);
	475	return res;
	476	}
	477
b4cb0d4d JD	478	static struct {
	479	unsigned long err;
	480	unsigned long fbd0;
	481	} chipset_ids[] __devinitdata = {
	482	{ PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
	483	{ PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
	484	{ 0, 0 }
b8fdaf5a DW	485	};
b8fdaf5a DW	486
c48a2916	487	#ifdef MODULE
6e31eb2b DW	488	static struct pci_device_id i5k_amb_ids[] __devinitdata = {
	489	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
	490	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
	491	{ 0, }
	492	};
	493	MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
c48a2916	494	#endif
6e31eb2b	495
298c7524 DW	496	static int __devinit i5k_amb_probe(struct platform_device *pdev)
	497	{
	498	struct i5k_amb_data *data;
	499	struct resource *reso;
b4cb0d4d	500	int i, res;
298c7524 DW	501
	502	data = kzalloc(sizeof(*data), GFP_KERNEL);
	503	if (!data)
	504	return -ENOMEM;
	505
	506	/* Figure out where the AMB registers live */
b8fdaf5a DW	507	i = 0;
b8fdaf5a DW	508	do {
b4cb0d4d JD	509	res = i5k_find_amb_registers(data, chipset_ids[i].err);
	510	if (res == 0)
	511	break;
b8fdaf5a	512	i++;
b4cb0d4d	513	} while (chipset_ids[i].err);
b8fdaf5a	514
298c7524 DW	515	if (res)
	516	goto err;
	517
	518	/* Copy the DIMM presence map for the first two channels */
b4cb0d4d	519	res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
298c7524 DW	520	if (res)
	521	goto err;
	522
	523	/* Copy the DIMM presence map for the optional second two channels */
b4cb0d4d	524	i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);
298c7524 DW	525
	526	/* Set up resource regions */
	527	reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
	528	if (!reso) {
	529	res = -EBUSY;
	530	goto err;
	531	}
	532
	533	data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
	534	if (!data->amb_mmio) {
	535	res = -EBUSY;
	536	goto err_map_failed;
	537	}
	538
	539	platform_set_drvdata(pdev, data);
	540
	541	res = i5k_amb_hwmon_init(pdev);
	542	if (res)
	543	goto err_init_failed;
	544
	545	return res;
	546
	547	err_init_failed:
	548	iounmap(data->amb_mmio);
	549	platform_set_drvdata(pdev, NULL);
	550	err_map_failed:
	551	release_mem_region(data->amb_base, data->amb_len);
	552	err:
	553	kfree(data);
	554	return res;
	555	}
	556
	557	static int __devexit i5k_amb_remove(struct platform_device *pdev)
	558	{
	559	int i;
	560	struct i5k_amb_data *data = platform_get_drvdata(pdev);
	561
	562	hwmon_device_unregister(data->hwmon_dev);
	563	device_remove_file(&pdev->dev, &dev_attr_name);
	564	for (i = 0; i < data->num_attrs; i++)
	565	device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
	566	kfree(data->attrs);
	567	iounmap(data->amb_mmio);
	568	release_mem_region(data->amb_base, data->amb_len);
	569	platform_set_drvdata(pdev, NULL);
	570	kfree(data);
	571	return 0;
	572	}
	573
	574	static struct platform_driver i5k_amb_driver = {
	575	.driver = {
	576	.owner = THIS_MODULE,
	577	.name = DRVNAME,
	578	},
	579	.probe = i5k_amb_probe,
	580	.remove = __devexit_p(i5k_amb_remove),
	581	};
	582
	583	static int __init i5k_amb_init(void)
	584	{
	585	int res;
	586
	587	res = platform_driver_register(&i5k_amb_driver);
	588	if (res)
589	return res;
590
591	res = i5k_amb_add();
592	if (res)
593	platform_driver_unregister(&i5k_amb_driver);
594
595	return res;
596	}
597
598	static void __exit i5k_amb_exit(void)
599	{
600	platform_device_unregister(amb_pdev);
601	platform_driver_unregister(&i5k_amb_driver);
602	}
603
604	MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
605	MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
606	MODULE_LICENSE("GPL");
607
608	module_init(i5k_amb_init);
609	module_exit(i5k_amb_exit);