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    Subject[PATCH v3] i5k_amb: New memory temperature sensor driver
    New driver to read FB-DIMM temperature sensors on systems with the
    Intel 5000 series chipsets.

    Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
    ---

    drivers/hwmon/Kconfig | 10 +
    drivers/hwmon/Makefile | 1
    drivers/hwmon/i5k_amb.c | 548 +++++++++++++++++++++++++++++++++++++++++++++++
    include/linux/pci_ids.h | 3
    4 files changed, 562 insertions(+), 0 deletions(-)

    diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
    index b8854b9..c2acb37 100644
    --- a/drivers/hwmon/Kconfig
    +++ b/drivers/hwmon/Kconfig
    @@ -215,6 +215,16 @@ config SENSORS_DS1621
    This driver can also be built as a module. If so, the module
    will be called ds1621.

    +config SENSORS_I5K_AMB
    + tristate "FB-DIMM AMB temperature sensor on Intel 5000 series chipsets"
    + depends on PCI && EXPERIMENTAL
    + help
    + If you say yes here you get support for FB-DIMM AMB temperature
    + monitoring chips on systems with the Intel 5000 series chipset.
    +
    + This driver can also be built as a module. If so, the module
    + will be called i5k_amb.
    +
    config SENSORS_F71805F
    tristate "Fintek F71805F/FG, F71806F/FG and F71872F/FG"
    depends on EXPERIMENTAL
    diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
    index 2f592e2..914c48c 100644
    --- a/drivers/hwmon/Makefile
    +++ b/drivers/hwmon/Makefile
    @@ -37,6 +37,7 @@ obj-$(CONFIG_SENSORS_FSCPOS) += fscpos.o
    obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o
    obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o
    obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o
    +obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
    obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
    obj-$(CONFIG_SENSORS_IT87) += it87.o
    obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o
    diff --git a/drivers/hwmon/i5k_amb.c b/drivers/hwmon/i5k_amb.c
    new file mode 100644
    index 0000000..3bde717
    --- /dev/null
    +++ b/drivers/hwmon/i5k_amb.c
    @@ -0,0 +1,548 @@
    +/*
    + * 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>
    +
    +#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
    +
    +#define AMB_REG_TEMP_STATUS(amb) ((amb) * AMB_CONFIG_SIZE + \
    + AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR)
    +#define AMB_REG_TEMP_MIN(amb) ((amb) * AMB_CONFIG_SIZE + \
    + AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR)
    +#define AMB_REG_TEMP_MID(amb) ((amb) * AMB_CONFIG_SIZE + \
    + AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR)
    +#define AMB_REG_TEMP_MAX(amb) ((amb) * AMB_CONFIG_SIZE + \
    + AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR)
    +#define AMB_REG_TEMP(amb) ((amb) * AMB_CONFIG_SIZE + \
    + AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR)
    +
    +#define MAX_MEM_CHANNELS 4
    +#define MAX_AMBS_PER_CHANNEL 16
    +#define MAX_AMBS (MAX_MEM_CHANNELS * \
    + MAX_AMBS_PER_CHANNEL)
    +/*
    + * 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 5
    +
    +#define AMB_NUM_FROM_REG(byte_num, bit_num) ((byte_num) * \
    + MAX_AMBS_PER_CHANNEL) + (bit_num)
    +
    +#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;
    + struct resource *resource;
    +
    + 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 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 */
    + for (i = 0; i < MAX_MEM_CHANNELS; i++) {
    + c = data->amb_present[i];
    + for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++) {
    + if (c & 0x1)
    + num_ambs++;
    + c >>= 1;
    + }
    + }
    +
    + /* 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++;
    +
    + /* 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;
    + 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;
    + 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;
    + 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;
    + 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;
    + 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)
    +{
    + struct pci_dev *pcidev;
    + u32 val32;
    + int res = -ENODEV;
    +
    + /* Find AMB register memory space */
    + pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
    + PCI_DEVICE_ID_INTEL_5000_ERR,
    + 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) {
    + printk(KERN_ERR DRVNAME "AMB region too small!\n");
    + goto out;
    + }
    +
    + res = 0;
    +out:
    + pci_dev_put(pcidev);
    + return res;
    +}
    +
    +static int __devinit i5k_channel_probe(struct i5k_amb_data *data, int which)
    +{
    + struct pci_dev *pcidev;
    + unsigned long dev_id;
    + u16 val16;
    + int res = -ENODEV;
    +
    + /* Two memory channels per FBD PCI device */
    + switch (which) {
    + case 0:
    + dev_id = PCI_DEVICE_ID_INTEL_5000_FBD0;
    + break;
    + case 1:
    + dev_id = PCI_DEVICE_ID_INTEL_5000_FBD1;
    + break;
    + default:
    + return -EINVAL;
    + }
    +
    + /* 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;
    + data->amb_present[which * 2] = val16;
    +
    + if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
    + goto out;
    + data->amb_present[which * 2 + 1] = val16;
    +
    + res = 0;
    +
    +out:
    + pci_dev_put(pcidev);
    + return res;
    +}
    +
    +static int __devinit i5k_amb_probe(struct platform_device *pdev)
    +{
    + struct i5k_amb_data *data;
    + struct resource *reso;
    + int res = -ENODEV;
    +
    + data = kzalloc(sizeof(*data), GFP_KERNEL);
    + if (!data)
    + return -ENOMEM;
    +
    + /* Figure out where the AMB registers live */
    + res = i5k_find_amb_registers(data);
    + if (res)
    + goto err;
    +
    + /* Copy the DIMM presence map for the first two channels */
    + res = i5k_channel_probe(data, 0);
    + if (res)
    + goto err;
    +
    + /* Copy the DIMM presence map for the optional second two channels */
    + i5k_channel_probe(data, 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);
    diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
    index 55f307f..d641b2f 100644
    --- a/include/linux/pci_ids.h
    +++ b/include/linux/pci_ids.h
    @@ -2241,6 +2241,9 @@
    #define PCI_DEVICE_ID_INTEL_82915G_IG 0x2582
    #define PCI_DEVICE_ID_INTEL_82915GM_HB 0x2590
    #define PCI_DEVICE_ID_INTEL_82915GM_IG 0x2592
    +#define PCI_DEVICE_ID_INTEL_5000_ERR 0x25F0
    +#define PCI_DEVICE_ID_INTEL_5000_FBD0 0x25F5
    +#define PCI_DEVICE_ID_INTEL_5000_FBD1 0x25F6
    #define PCI_DEVICE_ID_INTEL_82945G_HB 0x2770
    #define PCI_DEVICE_ID_INTEL_82945G_IG 0x2772
    #define PCI_DEVICE_ID_INTEL_3000_HB 0x2778
    -
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