Initial import

1 files changed, 616 insertions, 0 deletions

diff --git a/drivers/hwmon/i5k_amb.c b/drivers/hwmon/i5k_amb.c
new file mode 100644
index 000000000..6b3d1972c
--- /dev/null
+++ b/drivers/hwmon/i5k_amb.c
@@ -0,0 +1,616 @@
+/*
+ * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
+ * temperature sensors
+ * Copyright (C) 2007 IBM
+ *
+ * Author: Darrick J. Wong <darrick.wong@oracle.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);
+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);
+	kfree(data);
+	return 0;
+}
+
+static struct platform_driver i5k_amb_driver = {
+	.driver = {
+		.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 <darrick.wong@oracle.com>");
+MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
+MODULE_LICENSE("GPL");
+
+module_init(i5k_amb_init);
+module_exit(i5k_amb_exit);