| /* |
| * 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 __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 = 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); |