![Alexey Dobriyan](/assets/img/avatar_default.png)
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
414 lines
9.2 KiB
C
414 lines
9.2 KiB
C
/*
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* Windfarm PowerMac thermal control. SMU "satellite" controller sensors.
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*
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* Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
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*
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* Released under the terms of the GNU GPL v2.
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/i2c.h>
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#include <asm/semaphore.h>
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#include <asm/prom.h>
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#include <asm/smu.h>
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#include <asm/pmac_low_i2c.h>
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#include "windfarm.h"
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#define VERSION "0.2"
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#define DEBUG
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#ifdef DEBUG
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#define DBG(args...) printk(args)
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#else
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#define DBG(args...) do { } while(0)
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#endif
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/* If the cache is older than 800ms we'll refetch it */
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#define MAX_AGE msecs_to_jiffies(800)
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struct wf_sat {
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int nr;
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atomic_t refcnt;
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struct semaphore mutex;
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unsigned long last_read; /* jiffies when cache last updated */
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u8 cache[16];
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struct i2c_client i2c;
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struct device_node *node;
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};
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static struct wf_sat *sats[2];
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struct wf_sat_sensor {
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int index;
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int index2; /* used for power sensors */
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int shift;
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struct wf_sat *sat;
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struct wf_sensor sens;
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};
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#define wf_to_sat(c) container_of(c, struct wf_sat_sensor, sens)
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#define i2c_to_sat(c) container_of(c, struct wf_sat, i2c)
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static int wf_sat_attach(struct i2c_adapter *adapter);
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static int wf_sat_detach(struct i2c_client *client);
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static struct i2c_driver wf_sat_driver = {
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.driver = {
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.name = "wf_smu_sat",
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},
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.attach_adapter = wf_sat_attach,
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.detach_client = wf_sat_detach,
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};
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/*
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* XXX i2c_smbus_read_i2c_block_data doesn't pass the requested
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* length down to the low-level driver, so we use this, which
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* works well enough with the SMU i2c driver code...
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*/
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static int sat_read_block(struct i2c_client *client, u8 command,
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u8 *values, int len)
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{
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union i2c_smbus_data data;
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int err;
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data.block[0] = len;
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err = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
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I2C_SMBUS_READ, command, I2C_SMBUS_I2C_BLOCK_DATA,
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&data);
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if (!err)
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memcpy(values, data.block, len);
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return err;
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}
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struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id,
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unsigned int *size)
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{
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struct wf_sat *sat;
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int err;
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unsigned int i, len;
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u8 *buf;
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u8 data[4];
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/* TODO: Add the resulting partition to the device-tree */
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if (sat_id > 1 || (sat = sats[sat_id]) == NULL)
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return NULL;
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err = i2c_smbus_write_word_data(&sat->i2c, 8, id << 8);
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if (err) {
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printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err);
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return NULL;
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}
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len = i2c_smbus_read_word_data(&sat->i2c, 9);
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if (len < 0) {
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printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n");
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return NULL;
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}
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if (len == 0) {
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printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id);
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return NULL;
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}
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len = le16_to_cpu(len);
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len = (len + 3) & ~3;
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buf = kmalloc(len, GFP_KERNEL);
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if (buf == NULL)
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return NULL;
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for (i = 0; i < len; i += 4) {
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err = sat_read_block(&sat->i2c, 0xa, data, 4);
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if (err) {
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printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n",
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err);
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goto fail;
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}
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buf[i] = data[1];
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buf[i+1] = data[0];
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buf[i+2] = data[3];
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buf[i+3] = data[2];
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}
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#ifdef DEBUG
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DBG(KERN_DEBUG "sat %d partition %x:", sat_id, id);
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for (i = 0; i < len; ++i)
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DBG(" %x", buf[i]);
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DBG("\n");
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#endif
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if (size)
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*size = len;
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return (struct smu_sdbp_header *) buf;
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fail:
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kfree(buf);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition);
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/* refresh the cache */
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static int wf_sat_read_cache(struct wf_sat *sat)
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{
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int err;
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err = sat_read_block(&sat->i2c, 0x3f, sat->cache, 16);
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if (err)
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return err;
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sat->last_read = jiffies;
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#ifdef LOTSA_DEBUG
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{
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int i;
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DBG(KERN_DEBUG "wf_sat_get: data is");
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for (i = 0; i < 16; ++i)
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DBG(" %.2x", sat->cache[i]);
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DBG("\n");
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}
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#endif
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return 0;
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}
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static int wf_sat_get(struct wf_sensor *sr, s32 *value)
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{
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struct wf_sat_sensor *sens = wf_to_sat(sr);
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struct wf_sat *sat = sens->sat;
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int i, err;
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s32 val;
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if (sat->i2c.adapter == NULL)
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return -ENODEV;
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down(&sat->mutex);
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if (time_after(jiffies, (sat->last_read + MAX_AGE))) {
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err = wf_sat_read_cache(sat);
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if (err)
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goto fail;
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}
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i = sens->index * 2;
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val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift;
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if (sens->index2 >= 0) {
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i = sens->index2 * 2;
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/* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */
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val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4;
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}
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*value = val;
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err = 0;
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fail:
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up(&sat->mutex);
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return err;
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}
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static void wf_sat_release(struct wf_sensor *sr)
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{
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struct wf_sat_sensor *sens = wf_to_sat(sr);
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struct wf_sat *sat = sens->sat;
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if (atomic_dec_and_test(&sat->refcnt)) {
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if (sat->i2c.adapter) {
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i2c_detach_client(&sat->i2c);
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sat->i2c.adapter = NULL;
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}
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if (sat->nr >= 0)
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sats[sat->nr] = NULL;
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kfree(sat);
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}
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kfree(sens);
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}
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static struct wf_sensor_ops wf_sat_ops = {
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.get_value = wf_sat_get,
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.release = wf_sat_release,
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.owner = THIS_MODULE,
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};
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static void wf_sat_create(struct i2c_adapter *adapter, struct device_node *dev)
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{
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struct wf_sat *sat;
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struct wf_sat_sensor *sens;
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const u32 *reg;
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const char *loc, *type;
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u8 addr, chip, core;
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struct device_node *child;
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int shift, cpu, index;
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char *name;
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int vsens[2], isens[2];
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reg = get_property(dev, "reg", NULL);
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if (reg == NULL)
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return;
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addr = *reg;
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DBG(KERN_DEBUG "wf_sat: creating sat at address %x\n", addr);
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sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL);
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if (sat == NULL)
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return;
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sat->nr = -1;
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sat->node = of_node_get(dev);
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atomic_set(&sat->refcnt, 0);
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init_MUTEX(&sat->mutex);
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sat->i2c.addr = (addr >> 1) & 0x7f;
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sat->i2c.adapter = adapter;
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sat->i2c.driver = &wf_sat_driver;
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strncpy(sat->i2c.name, "smu-sat", I2C_NAME_SIZE-1);
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if (i2c_attach_client(&sat->i2c)) {
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printk(KERN_ERR "windfarm: failed to attach smu-sat to i2c\n");
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goto fail;
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}
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vsens[0] = vsens[1] = -1;
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isens[0] = isens[1] = -1;
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child = NULL;
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while ((child = of_get_next_child(dev, child)) != NULL) {
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reg = get_property(child, "reg", NULL);
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type = get_property(child, "device_type", NULL);
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loc = get_property(child, "location", NULL);
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if (reg == NULL || loc == NULL)
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continue;
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/* the cooked sensors are between 0x30 and 0x37 */
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if (*reg < 0x30 || *reg > 0x37)
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continue;
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index = *reg - 0x30;
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/* expect location to be CPU [AB][01] ... */
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if (strncmp(loc, "CPU ", 4) != 0)
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continue;
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chip = loc[4] - 'A';
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core = loc[5] - '0';
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if (chip > 1 || core > 1) {
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printk(KERN_ERR "wf_sat_create: don't understand "
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"location %s for %s\n", loc, child->full_name);
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continue;
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}
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cpu = 2 * chip + core;
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if (sat->nr < 0)
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sat->nr = chip;
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else if (sat->nr != chip) {
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printk(KERN_ERR "wf_sat_create: can't cope with "
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"multiple CPU chips on one SAT (%s)\n", loc);
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continue;
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}
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if (strcmp(type, "voltage-sensor") == 0) {
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name = "cpu-voltage";
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shift = 4;
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vsens[core] = index;
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} else if (strcmp(type, "current-sensor") == 0) {
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name = "cpu-current";
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shift = 8;
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isens[core] = index;
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} else if (strcmp(type, "temp-sensor") == 0) {
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name = "cpu-temp";
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shift = 10;
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} else
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continue; /* hmmm shouldn't happen */
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/* the +16 is enough for "cpu-voltage-n" */
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sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
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if (sens == NULL) {
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printk(KERN_ERR "wf_sat_create: couldn't create "
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"%s sensor %d (no memory)\n", name, cpu);
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continue;
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}
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sens->index = index;
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sens->index2 = -1;
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sens->shift = shift;
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sens->sat = sat;
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atomic_inc(&sat->refcnt);
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sens->sens.ops = &wf_sat_ops;
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sens->sens.name = (char *) (sens + 1);
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snprintf(sens->sens.name, 16, "%s-%d", name, cpu);
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if (wf_register_sensor(&sens->sens)) {
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atomic_dec(&sat->refcnt);
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kfree(sens);
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}
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}
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/* make the power sensors */
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for (core = 0; core < 2; ++core) {
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if (vsens[core] < 0 || isens[core] < 0)
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continue;
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cpu = 2 * sat->nr + core;
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sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
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if (sens == NULL) {
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printk(KERN_ERR "wf_sat_create: couldn't create power "
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"sensor %d (no memory)\n", cpu);
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continue;
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}
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sens->index = vsens[core];
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sens->index2 = isens[core];
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sens->shift = 0;
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sens->sat = sat;
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atomic_inc(&sat->refcnt);
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sens->sens.ops = &wf_sat_ops;
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sens->sens.name = (char *) (sens + 1);
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snprintf(sens->sens.name, 16, "cpu-power-%d", cpu);
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if (wf_register_sensor(&sens->sens)) {
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atomic_dec(&sat->refcnt);
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kfree(sens);
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}
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}
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if (sat->nr >= 0)
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sats[sat->nr] = sat;
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return;
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fail:
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kfree(sat);
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}
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static int wf_sat_attach(struct i2c_adapter *adapter)
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{
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struct device_node *busnode, *dev = NULL;
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struct pmac_i2c_bus *bus;
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bus = pmac_i2c_adapter_to_bus(adapter);
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if (bus == NULL)
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return -ENODEV;
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busnode = pmac_i2c_get_bus_node(bus);
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while ((dev = of_get_next_child(busnode, dev)) != NULL)
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if (device_is_compatible(dev, "smu-sat"))
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wf_sat_create(adapter, dev);
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return 0;
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}
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static int wf_sat_detach(struct i2c_client *client)
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{
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struct wf_sat *sat = i2c_to_sat(client);
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/* XXX TODO */
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sat->i2c.adapter = NULL;
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return 0;
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}
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static int __init sat_sensors_init(void)
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{
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return i2c_add_driver(&wf_sat_driver);
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}
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static void __exit sat_sensors_exit(void)
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{
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i2c_del_driver(&wf_sat_driver);
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}
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module_init(sat_sensors_init);
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/*module_exit(sat_sensors_exit); Uncomment when cleanup is implemented */
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MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
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MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control");
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MODULE_LICENSE("GPL");
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