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|
/*
* A driver for the Integrated Circuits ICS932S401
* Copyright (C) 2008 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/jiffies.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/log2.h>
#include <linux/slab.h>
/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x69, I2C_CLIENT_END };
/* ICS932S401 registers */
#define ICS932S401_REG_CFG2 0x01
#define ICS932S401_CFG1_SPREAD 0x01
#define ICS932S401_REG_CFG7 0x06
#define ICS932S401_FS_MASK 0x07
#define ICS932S401_REG_VENDOR_REV 0x07
#define ICS932S401_VENDOR 1
#define ICS932S401_VENDOR_MASK 0x0F
#define ICS932S401_REV 4
#define ICS932S401_REV_SHIFT 4
#define ICS932S401_REG_DEVICE 0x09
#define ICS932S401_DEVICE 11
#define ICS932S401_REG_CTRL 0x0A
#define ICS932S401_MN_ENABLED 0x80
#define ICS932S401_CPU_ALT 0x04
#define ICS932S401_SRC_ALT 0x08
#define ICS932S401_REG_CPU_M_CTRL 0x0B
#define ICS932S401_M_MASK 0x3F
#define ICS932S401_REG_CPU_N_CTRL 0x0C
#define ICS932S401_REG_CPU_SPREAD1 0x0D
#define ICS932S401_REG_CPU_SPREAD2 0x0E
#define ICS932S401_SPREAD_MASK 0x7FFF
#define ICS932S401_REG_SRC_M_CTRL 0x0F
#define ICS932S401_REG_SRC_N_CTRL 0x10
#define ICS932S401_REG_SRC_SPREAD1 0x11
#define ICS932S401_REG_SRC_SPREAD2 0x12
#define ICS932S401_REG_CPU_DIVISOR 0x13
#define ICS932S401_CPU_DIVISOR_SHIFT 4
#define ICS932S401_REG_PCISRC_DIVISOR 0x14
#define ICS932S401_SRC_DIVISOR_MASK 0x0F
#define ICS932S401_PCI_DIVISOR_SHIFT 4
/* Base clock is 14.318MHz */
#define BASE_CLOCK 14318
#define NUM_REGS 21
#define NUM_MIRRORED_REGS 15
static int regs_to_copy[NUM_MIRRORED_REGS] = {
ICS932S401_REG_CFG2,
ICS932S401_REG_CFG7,
ICS932S401_REG_VENDOR_REV,
ICS932S401_REG_DEVICE,
ICS932S401_REG_CTRL,
ICS932S401_REG_CPU_M_CTRL,
ICS932S401_REG_CPU_N_CTRL,
ICS932S401_REG_CPU_SPREAD1,
ICS932S401_REG_CPU_SPREAD2,
ICS932S401_REG_SRC_M_CTRL,
ICS932S401_REG_SRC_N_CTRL,
ICS932S401_REG_SRC_SPREAD1,
ICS932S401_REG_SRC_SPREAD2,
ICS932S401_REG_CPU_DIVISOR,
ICS932S401_REG_PCISRC_DIVISOR,
};
/* How often do we reread sensors values? (In jiffies) */
#define SENSOR_REFRESH_INTERVAL (2 * HZ)
/* How often do we reread sensor limit values? (In jiffies) */
#define LIMIT_REFRESH_INTERVAL (60 * HZ)
struct ics932s401_data {
struct attribute_group attrs;
struct mutex lock;
char sensors_valid;
unsigned long sensors_last_updated; /* In jiffies */
u8 regs[NUM_REGS];
};
static int ics932s401_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int ics932s401_detect(struct i2c_client *client,
struct i2c_board_info *info);
static int ics932s401_remove(struct i2c_client *client);
static const struct i2c_device_id ics932s401_id[] = {
{ "ics932s401", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ics932s401_id);
static struct i2c_driver ics932s401_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "ics932s401",
},
.probe = ics932s401_probe,
.remove = ics932s401_remove,
.id_table = ics932s401_id,
.detect = ics932s401_detect,
.address_list = normal_i2c,
};
static struct ics932s401_data *ics932s401_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ics932s401_data *data = i2c_get_clientdata(client);
unsigned long local_jiffies = jiffies;
int i, temp;
mutex_lock(&data->lock);
if (time_before(local_jiffies, data->sensors_last_updated +
SENSOR_REFRESH_INTERVAL)
&& data->sensors_valid)
goto out;
/*
* Each register must be read as a word and then right shifted 8 bits.
* Not really sure why this is; setting the "byte count programming"
* register to 1 does not fix this problem.
*/
for (i = 0; i < NUM_MIRRORED_REGS; i++) {
temp = i2c_smbus_read_word_data(client, regs_to_copy[i]);
data->regs[regs_to_copy[i]] = temp >> 8;
}
data->sensors_last_updated = local_jiffies;
data->sensors_valid = 1;
out:
mutex_unlock(&data->lock);
return data;
}
static ssize_t show_spread_enabled(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct ics932s401_data *data = ics932s401_update_device(dev);
if (data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD)
return sprintf(buf, "1\n");
return sprintf(buf, "0\n");
}
/* bit to cpu khz map */
static const int fs_speeds[] = {
266666,
133333,
200000,
166666,
333333,
100000,
400000,
0,
};
/* clock divisor map */
static const int divisors[] = {2, 3, 5, 15, 4, 6, 10, 30, 8, 12, 20, 60, 16,
24, 40, 120};
/* Calculate CPU frequency from the M/N registers. */
static int calculate_cpu_freq(struct ics932s401_data *data)
{
int m, n, freq;
m = data->regs[ICS932S401_REG_CPU_M_CTRL] & ICS932S401_M_MASK;
n = data->regs[ICS932S401_REG_CPU_N_CTRL];
/* Pull in bits 8 & 9 from the M register */
n |= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x80) << 1;
n |= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x40) << 3;
freq = BASE_CLOCK * (n + 8) / (m + 2);
freq /= divisors[data->regs[ICS932S401_REG_CPU_DIVISOR] >>
ICS932S401_CPU_DIVISOR_SHIFT];
return freq;
}
static ssize_t show_cpu_clock(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct ics932s401_data *data = ics932s401_update_device(dev);
return sprintf(buf, "%d\n", calculate_cpu_freq(data));
}
static ssize_t show_cpu_clock_sel(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct ics932s401_data *data = ics932s401_update_device(dev);
int freq;
if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
freq = calculate_cpu_freq(data);
else {
/* Freq is neatly wrapped up for us */
int fid = data->regs[ICS932S401_REG_CFG7] & ICS932S401_FS_MASK;
freq = fs_speeds[fid];
if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT) {
switch (freq) {
case 166666:
freq = 160000;
break;
case 333333:
freq = 320000;
break;
}
}
}
return sprintf(buf, "%d\n", freq);
}
/* Calculate SRC frequency from the M/N registers. */
static int calculate_src_freq(struct ics932s401_data *data)
{
int m, n, freq;
m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK;
n = data->regs[ICS932S401_REG_SRC_N_CTRL];
/* Pull in bits 8 & 9 from the M register */
n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1;
n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3;
freq = BASE_CLOCK * (n + 8) / (m + 2);
freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] &
ICS932S401_SRC_DIVISOR_MASK];
return freq;
}
static ssize_t show_src_clock(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct ics932s401_data *data = ics932s401_update_device(dev);
return sprintf(buf, "%d\n", calculate_src_freq(data));
}
static ssize_t show_src_clock_sel(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct ics932s401_data *data = ics932s401_update_device(dev);
int
|