[GitHub/mt8127/android_kernel_alcatel_ttab.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/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.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;
	int ret = kstrtoul(buf, 10, &temp);
	if (ret < 0)
		return ret;

	temp = temp / 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;
	int ret = kstrtoul(buf, 10, &temp);
	if (ret < 0)
		return ret;

	temp = temp / 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;
	int ret = kstrtoul(buf, 10, &temp);
	if (ret < 0)
		return ret;

	temp = temp / 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 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 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 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 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[]  = {
	{ 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[] = {
	{ 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 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 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 = 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>
298c7524 DW	24	#include <linux/hwmon.h>
	25	#include <linux/hwmon-sysfs.h>
	26	#include <linux/err.h>
	27	#include <linux/mutex.h>
298c7524 DW	28	#include <linux/log2.h>
	29	#include <linux/pci.h>
	30	#include <linux/platform_device.h>
5a0e3ad6	31	#include <linux/slab.h>
298c7524 DW	32
	33	#define DRVNAME "i5k_amb"
	34
	35	#define I5K_REG_AMB_BASE_ADDR 0x48
	36	#define I5K_REG_AMB_LEN_ADDR 0x50
	37	#define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
	38	#define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
	39
	40	#define AMB_REG_TEMP_MIN_ADDR 0x80
	41	#define AMB_REG_TEMP_MID_ADDR 0x81
	42	#define AMB_REG_TEMP_MAX_ADDR 0x82
	43	#define AMB_REG_TEMP_STATUS_ADDR 0x84
	44	#define AMB_REG_TEMP_ADDR 0x85
	45
	46	#define AMB_CONFIG_SIZE 2048
	47	#define AMB_FUNC_3_OFFSET 768
	48
59a030a9 DW	49	static unsigned long amb_reg_temp_status(unsigned int amb)
	50	{
	51	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
	52	AMB_CONFIG_SIZE * amb;
	53	}
	54
	55	static unsigned long amb_reg_temp_min(unsigned int amb)
	56	{
	57	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
	58	AMB_CONFIG_SIZE * amb;
	59	}
	60
	61	static unsigned long amb_reg_temp_mid(unsigned int amb)
	62	{
	63	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
	64	AMB_CONFIG_SIZE * amb;
	65	}
	66
	67	static unsigned long amb_reg_temp_max(unsigned int amb)
	68	{
	69	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
	70	AMB_CONFIG_SIZE * amb;
	71	}
	72
	73	static unsigned long amb_reg_temp(unsigned int amb)
	74	{
	75	return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
	76	AMB_CONFIG_SIZE * amb;
	77	}
298c7524 DW	78
	79	#define MAX_MEM_CHANNELS 4
	80	#define MAX_AMBS_PER_CHANNEL 16
	81	#define MAX_AMBS (MAX_MEM_CHANNELS * \
	82	MAX_AMBS_PER_CHANNEL)
963d96b5 DW	83	#define CHANNEL_SHIFT 4
963d96b5 DW	84	#define DIMM_MASK 0xF
298c7524 DW	85	/*
	86	* Ugly hack: For some reason the highest bit is set if there
	87	* are _any_ DIMMs in the channel. Attempting to read from
	88	* this "high-order" AMB results in a memory bus error, so
	89	* for now we'll just ignore that top bit, even though that
	90	* might prevent us from seeing the 16th DIMM in the channel.
	91	*/
	92	#define REAL_MAX_AMBS_PER_CHANNEL 15
963d96b5	93	#define KNOBS_PER_AMB 6
298c7524	94
59a030a9 DW	95	static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
	96	{
	97	return byte_num * MAX_AMBS_PER_CHANNEL + bit;
	98	}
298c7524 DW	99
	100	#define AMB_SYSFS_NAME_LEN 16
	101	struct i5k_device_attribute {
	102	struct sensor_device_attribute s_attr;
	103	char name[AMB_SYSFS_NAME_LEN];
	104	};
	105
	106	struct i5k_amb_data {
	107	struct device *hwmon_dev;
	108
	109	unsigned long amb_base;
	110	unsigned long amb_len;
	111	u16 amb_present[MAX_MEM_CHANNELS];
	112	void __iomem *amb_mmio;
	113	struct i5k_device_attribute *attrs;
	114	unsigned int num_attrs;
	115	};
	116
	117	static ssize_t show_name(struct device dev, struct device_attribute devattr,
	118	char *buf)
	119	{
	120	return sprintf(buf, "%s\n", DRVNAME);
	121	}
	122
	123
	124	static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
	125
	126	static struct platform_device *amb_pdev;
	127
	128	static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
	129	{
	130	return ioread8(data->amb_mmio + offset);
	131	}
	132
	133	static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
	134	u8 val)
	135	{
	136	iowrite8(val, data->amb_mmio + offset);
	137	}
	138
	139	static ssize_t show_amb_alarm(struct device *dev,
	140	struct device_attribute *devattr,
	141	char *buf)
	142	{
	143	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	144	struct i5k_amb_data *data = dev_get_drvdata(dev);
	145
59a030a9 DW	146	if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
59a030a9 DW	147	(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
298c7524 DW	148	return sprintf(buf, "1\n");
	149	else
	150	return sprintf(buf, "0\n");
	151	}
	152
	153	static ssize_t store_amb_min(struct device *dev,
	154	struct device_attribute *devattr,
	155	const char *buf,
	156	size_t count)
	157	{
	158	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	159	struct i5k_amb_data *data = dev_get_drvdata(dev);
7b102ed6 FM	160	unsigned long temp;
	161	int ret = kstrtoul(buf, 10, &temp);
	162	if (ret < 0)
	163	return ret;
298c7524	164
7b102ed6	165	temp = temp / 500;
298c7524 DW	166	if (temp > 255)
	167	temp = 255;
	168
59a030a9	169	amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
298c7524 DW	170	return count;
	171	}
	172
	173	static ssize_t store_amb_mid(struct device *dev,
	174	struct device_attribute *devattr,
	175	const char *buf,
	176	size_t count)
	177	{
	178	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	179	struct i5k_amb_data *data = dev_get_drvdata(dev);
7b102ed6 FM	180	unsigned long temp;
	181	int ret = kstrtoul(buf, 10, &temp);
	182	if (ret < 0)
	183	return ret;
298c7524	184
7b102ed6	185	temp = temp / 500;
298c7524 DW	186	if (temp > 255)
	187	temp = 255;
	188
59a030a9	189	amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
298c7524 DW	190	return count;
	191	}
	192
	193	static ssize_t store_amb_max(struct device *dev,
	194	struct device_attribute *devattr,
	195	const char *buf,
	196	size_t count)
	197	{
	198	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	199	struct i5k_amb_data *data = dev_get_drvdata(dev);
7b102ed6 FM	200	unsigned long temp;
	201	int ret = kstrtoul(buf, 10, &temp);
	202	if (ret < 0)
	203	return ret;
298c7524	204
7b102ed6	205	temp = temp / 500;
298c7524 DW	206	if (temp > 255)
	207	temp = 255;
	208
59a030a9	209	amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
298c7524 DW	210	return count;
	211	}
	212
	213	static ssize_t show_amb_min(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_min(attr->index)));
298c7524 DW	221	}
	222
	223	static ssize_t show_amb_mid(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_mid(attr->index)));
298c7524 DW	231	}
	232
	233	static ssize_t show_amb_max(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_max(attr->index)));
298c7524 DW	241	}
	242
	243	static ssize_t show_amb_temp(struct device *dev,
	244	struct device_attribute *devattr,
	245	char *buf)
	246	{
	247	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	248	struct i5k_amb_data *data = dev_get_drvdata(dev);
	249	return sprintf(buf, "%d\n",
59a030a9	250	500 * amb_read_byte(data, amb_reg_temp(attr->index)));
298c7524 DW	251	}
298c7524 DW	252
963d96b5 DW	253	static ssize_t show_label(struct device *dev,
	254	struct device_attribute *devattr,
	255	char *buf)
	256	{
	257	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	258
	259	return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
	260	attr->index & DIMM_MASK);
	261	}
	262
6c931ae1	263	static int i5k_amb_hwmon_init(struct platform_device *pdev)
298c7524 DW	264	{
	265	int i, j, k, d = 0;
	266	u16 c;
	267	int res = 0;
	268	int num_ambs = 0;
	269	struct i5k_amb_data *data = platform_get_drvdata(pdev);
	270
	271	/* Count the number of AMBs found */
	272	/* ignore the high-order bit, see "Ugly hack" comment above */
	273	for (i = 0; i < MAX_MEM_CHANNELS; i++)
	274	num_ambs += hweight16(data->amb_present[i] & 0x7fff);
	275
	276	/* Set up sysfs stuff */
	277	data->attrs = kzalloc(sizeof(data->attrs) num_ambs * KNOBS_PER_AMB,
	278	GFP_KERNEL);
	279	if (!data->attrs)
	280	return -ENOMEM;
	281	data->num_attrs = 0;
	282
	283	for (i = 0; i < MAX_MEM_CHANNELS; i++) {
	284	c = data->amb_present[i];
	285	for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
	286	struct i5k_device_attribute *iattr;
	287
59a030a9	288	k = amb_num_from_reg(i, j);
298c7524 DW	289	if (!(c & 0x1))
	290	continue;
	291	d++;
	292
963d96b5 DW	293	/* sysfs label */
	294	iattr = data->attrs + data->num_attrs;
	295	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	296	"temp%d_label", d);
	297	iattr->s_attr.dev_attr.attr.name = iattr->name;
	298	iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
	299	iattr->s_attr.dev_attr.show = show_label;
	300	iattr->s_attr.index = k;
0e6c7870	301	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
963d96b5 DW	302	res = device_create_file(&pdev->dev,
	303	&iattr->s_attr.dev_attr);
	304	if (res)
	305	goto exit_remove;
	306	data->num_attrs++;
	307
298c7524 DW	308	/* Temperature sysfs knob */
	309	iattr = data->attrs + data->num_attrs;
	310	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	311	"temp%d_input", d);
	312	iattr->s_attr.dev_attr.attr.name = iattr->name;
	313	iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
	314	iattr->s_attr.dev_attr.show = show_amb_temp;
	315	iattr->s_attr.index = k;
0e6c7870	316	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298c7524 DW	317	res = device_create_file(&pdev->dev,
	318	&iattr->s_attr.dev_attr);
	319	if (res)
	320	goto exit_remove;
	321	data->num_attrs++;
	322
	323	/* Temperature min sysfs knob */
	324	iattr = data->attrs + data->num_attrs;
	325	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	326	"temp%d_min", d);
	327	iattr->s_attr.dev_attr.attr.name = iattr->name;
	328	iattr->s_attr.dev_attr.attr.mode = S_IWUSR \| S_IRUGO;
	329	iattr->s_attr.dev_attr.show = show_amb_min;
	330	iattr->s_attr.dev_attr.store = store_amb_min;
	331	iattr->s_attr.index = k;
0e6c7870	332	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298c7524 DW	333	res = device_create_file(&pdev->dev,
	334	&iattr->s_attr.dev_attr);
	335	if (res)
	336	goto exit_remove;
	337	data->num_attrs++;
	338
	339	/* Temperature mid sysfs knob */
	340	iattr = data->attrs + data->num_attrs;
	341	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	342	"temp%d_mid", d);
	343	iattr->s_attr.dev_attr.attr.name = iattr->name;
	344	iattr->s_attr.dev_attr.attr.mode = S_IWUSR \| S_IRUGO;
	345	iattr->s_attr.dev_attr.show = show_amb_mid;
	346	iattr->s_attr.dev_attr.store = store_amb_mid;
	347	iattr->s_attr.index = k;
0e6c7870	348	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298c7524 DW	349	res = device_create_file(&pdev->dev,
	350	&iattr->s_attr.dev_attr);
	351	if (res)
	352	goto exit_remove;
	353	data->num_attrs++;
	354
	355	/* Temperature max sysfs knob */
	356	iattr = data->attrs + data->num_attrs;
	357	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	358	"temp%d_max", d);
	359	iattr->s_attr.dev_attr.attr.name = iattr->name;
	360	iattr->s_attr.dev_attr.attr.mode = S_IWUSR \| S_IRUGO;
	361	iattr->s_attr.dev_attr.show = show_amb_max;
	362	iattr->s_attr.dev_attr.store = store_amb_max;
	363	iattr->s_attr.index = k;
0e6c7870	364	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298c7524 DW	365	res = device_create_file(&pdev->dev,
	366	&iattr->s_attr.dev_attr);
	367	if (res)
	368	goto exit_remove;
	369	data->num_attrs++;
	370
	371	/* Temperature alarm sysfs knob */
	372	iattr = data->attrs + data->num_attrs;
	373	snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
	374	"temp%d_alarm", d);
	375	iattr->s_attr.dev_attr.attr.name = iattr->name;
	376	iattr->s_attr.dev_attr.attr.mode = S_IRUGO;
	377	iattr->s_attr.dev_attr.show = show_amb_alarm;
	378	iattr->s_attr.index = k;
0e6c7870	379	sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
298c7524 DW	380	res = device_create_file(&pdev->dev,
	381	&iattr->s_attr.dev_attr);
	382	if (res)
	383	goto exit_remove;
	384	data->num_attrs++;
	385	}
	386	}
	387
	388	res = device_create_file(&pdev->dev, &dev_attr_name);
	389	if (res)
	390	goto exit_remove;
	391
	392	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	393	if (IS_ERR(data->hwmon_dev)) {
	394	res = PTR_ERR(data->hwmon_dev);
	395	goto exit_remove;
	396	}
	397
	398	return res;
	399
	400	exit_remove:
	401	device_remove_file(&pdev->dev, &dev_attr_name);
	402	for (i = 0; i < data->num_attrs; i++)
	403	device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
	404	kfree(data->attrs);
	405
	406	return res;
	407	}
	408
6c931ae1	409	static int i5k_amb_add(void)
298c7524 DW	410	{
	411	int res = -ENODEV;
	412
	413	/* only ever going to be one of these */
	414	amb_pdev = platform_device_alloc(DRVNAME, 0);
	415	if (!amb_pdev)
	416	return -ENOMEM;
	417
	418	res = platform_device_add(amb_pdev);
	419	if (res)
	420	goto err;
	421	return 0;
	422
	423	err:
	424	platform_device_put(amb_pdev);
	425	return res;
	426	}
	427
6c931ae1	428	static int i5k_find_amb_registers(struct i5k_amb_data *data,
b8fdaf5a	429	unsigned long devid)
298c7524 DW	430	{
	431	struct pci_dev *pcidev;
	432	u32 val32;
	433	int res = -ENODEV;
	434
	435	/* Find AMB register memory space */
	436	pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
b8fdaf5a	437	devid,
298c7524 DW	438	NULL);
	439	if (!pcidev)
	440	return -ENODEV;
	441
	442	if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
	443	goto out;
	444	data->amb_base = val32;
	445
	446	if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
	447	goto out;
	448	data->amb_len = val32;
	449
	450	/* Is it big enough? */
	451	if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
	452	dev_err(&pcidev->dev, "AMB region too small!\n");
	453	goto out;
	454	}
	455
	456	res = 0;
	457	out:
	458	pci_dev_put(pcidev);
	459	return res;
	460	}
	461
6c931ae1	462	static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
298c7524 DW	463	{
	464	struct pci_dev *pcidev;
	465	u16 val16;
	466	int res = -ENODEV;
	467
	468	/* Copy the DIMM presence map for these two channels */
	469	pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
	470	if (!pcidev)
	471	return -ENODEV;
	472
	473	if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
	474	goto out;
	475	amb_present[0] = val16;
	476
	477	if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
	478	goto out;
	479	amb_present[1] = val16;
	480
	481	res = 0;
	482
	483	out:
	484	pci_dev_put(pcidev);
	485	return res;
	486	}
	487
b4cb0d4d JD	488	static struct {
	489	unsigned long err;
	490	unsigned long fbd0;
a5977246	491	} chipset_ids[] = {
b4cb0d4d JD	492	{ PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
	493	{ PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
	494	{ 0, 0 }
b8fdaf5a DW	495	};
b8fdaf5a DW	496
c48a2916	497	#ifdef MODULE
a5977246	498	static struct pci_device_id i5k_amb_ids[] = {
6e31eb2b DW	499	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
	500	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
	501	{ 0, }
	502	};
	503	MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
c48a2916	504	#endif
6e31eb2b	505
6c931ae1	506	static int i5k_amb_probe(struct platform_device *pdev)
298c7524 DW	507	{
	508	struct i5k_amb_data *data;
	509	struct resource *reso;
b4cb0d4d	510	int i, res;
298c7524 DW	511
	512	data = kzalloc(sizeof(*data), GFP_KERNEL);
	513	if (!data)
	514	return -ENOMEM;
	515
	516	/* Figure out where the AMB registers live */
b8fdaf5a DW	517	i = 0;
b8fdaf5a DW	518	do {
b4cb0d4d JD	519	res = i5k_find_amb_registers(data, chipset_ids[i].err);
	520	if (res == 0)
	521	break;
b8fdaf5a	522	i++;
b4cb0d4d	523	} while (chipset_ids[i].err);
b8fdaf5a	524
298c7524 DW	525	if (res)
	526	goto err;
	527
	528	/* Copy the DIMM presence map for the first two channels */
b4cb0d4d	529	res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
298c7524 DW	530	if (res)
	531	goto err;
	532
	533	/* Copy the DIMM presence map for the optional second two channels */
b4cb0d4d	534	i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);
298c7524 DW	535
	536	/* Set up resource regions */
	537	reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
	538	if (!reso) {
	539	res = -EBUSY;
	540	goto err;
	541	}
	542
	543	data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
	544	if (!data->amb_mmio) {
	545	res = -EBUSY;
	546	goto err_map_failed;
	547	}
	548
	549	platform_set_drvdata(pdev, data);
	550
	551	res = i5k_amb_hwmon_init(pdev);
	552	if (res)
	553	goto err_init_failed;
	554
	555	return res;
	556
	557	err_init_failed:
	558	iounmap(data->amb_mmio);
	559	platform_set_drvdata(pdev, NULL);
	560	err_map_failed:
	561	release_mem_region(data->amb_base, data->amb_len);
	562	err:
	563	kfree(data);
	564	return res;
	565	}
	566
281dfd0b	567	static int i5k_amb_remove(struct platform_device *pdev)
298c7524 DW	568	{
	569	int i;
	570	struct i5k_amb_data *data = platform_get_drvdata(pdev);
	571
	572	hwmon_device_unregister(data->hwmon_dev);
	573	device_remove_file(&pdev->dev, &dev_attr_name);
	574	for (i = 0; i < data->num_attrs; i++)
	575	device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
	576	kfree(data->attrs);
	577	iounmap(data->amb_mmio);
	578	release_mem_region(data->amb_base, data->amb_len);
	579	platform_set_drvdata(pdev, NULL);
	580	kfree(data);
	581	return 0;
	582	}
	583
	584	static struct platform_driver i5k_amb_driver = {
	585	.driver = {
	586	.owner = THIS_MODULE,
	587	.name = DRVNAME,
	588	},
	589	.probe = i5k_amb_probe,
9e5e9b7a	590	.remove = i5k_amb_remove,
298c7524 DW	591	};
	592
	593	static int __init i5k_amb_init(void)
	594	{
	595	int res;
	596
	597	res = platform_driver_register(&i5k_amb_driver);
	598	if (res)
	599	return res;
	600
	601	res = i5k_amb_add();
	602	if (res)
	603	platform_driver_unregister(&i5k_amb_driver);
	604
	605	return res;
	606	}
	607
	608	static void __exit i5k_amb_exit(void)
	609	{
	610	platform_device_unregister(amb_pdev);
	611	platform_driver_unregister(&i5k_amb_driver);
	612	}
	613
	614	MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
	615	MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
	616	MODULE_LICENSE("GPL");
	617
	618	module_init(i5k_amb_init);
	619	module_exit(i5k_amb_exit);