364 lines
8.2 KiB
C
364 lines
8.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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 <linux/mutex.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 "1.0"
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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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struct kref ref;
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int nr;
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struct mutex 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 list_head sensors;
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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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struct list_head link;
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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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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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err = i2c_smbus_read_word_data(sat->i2c, 9);
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if (err < 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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len = err;
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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 = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data);
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if (err < 0) {
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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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printk(KERN_DEBUG "sat %d partition %x:", sat_id, id);
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print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET,
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16, 1, buf, len, false);
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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 = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache);
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if (err < 0)
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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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printk(KERN_DEBUG "wf_sat_get: data is");
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print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET,
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16, 1, sat->cache, 16, false);
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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_sensor_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 == NULL)
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return -ENODEV;
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mutex_lock(&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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mutex_unlock(&sat->mutex);
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return err;
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}
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static void wf_sat_release(struct kref *ref)
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{
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struct wf_sat *sat = container_of(ref, struct wf_sat, ref);
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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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static void wf_sat_sensor_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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kfree(sens);
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kref_put(&sat->ref, wf_sat_release);
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}
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static const struct wf_sensor_ops wf_sat_ops = {
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.get_value = wf_sat_sensor_get,
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.release = wf_sat_sensor_release,
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.owner = THIS_MODULE,
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};
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static int wf_sat_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device_node *dev = client->dev.of_node;
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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;
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u8 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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sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL);
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if (sat == NULL)
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return -ENOMEM;
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sat->nr = -1;
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sat->node = of_node_get(dev);
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kref_init(&sat->ref);
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mutex_init(&sat->mutex);
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sat->i2c = client;
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INIT_LIST_HEAD(&sat->sensors);
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i2c_set_clientdata(client, sat);
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vsens[0] = vsens[1] = -1;
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isens[0] = isens[1] = -1;
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for_each_child_of_node(dev, child) {
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reg = of_get_property(child, "reg", NULL);
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loc = of_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 %pOF\n", loc, child);
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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 (of_node_is_type(child, "voltage-sensor")) {
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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 (of_node_is_type(child, "current-sensor")) {
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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 (of_node_is_type(child, "temp-sensor")) {
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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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sens->sens.ops = &wf_sat_ops;
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sens->sens.name = (char *) (sens + 1);
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snprintf((char *)sens->sens.name, 16, "%s-%d", name, cpu);
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if (wf_register_sensor(&sens->sens))
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kfree(sens);
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else {
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list_add(&sens->link, &sat->sensors);
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kref_get(&sat->ref);
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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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sens->sens.ops = &wf_sat_ops;
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sens->sens.name = (char *) (sens + 1);
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snprintf((char *)sens->sens.name, 16, "cpu-power-%d", cpu);
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if (wf_register_sensor(&sens->sens))
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kfree(sens);
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else {
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list_add(&sens->link, &sat->sensors);
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kref_get(&sat->ref);
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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 0;
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}
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static int wf_sat_remove(struct i2c_client *client)
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{
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struct wf_sat *sat = i2c_get_clientdata(client);
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struct wf_sat_sensor *sens;
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/* release sensors */
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while(!list_empty(&sat->sensors)) {
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sens = list_first_entry(&sat->sensors,
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struct wf_sat_sensor, link);
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list_del(&sens->link);
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wf_unregister_sensor(&sens->sens);
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}
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sat->i2c = NULL;
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kref_put(&sat->ref, wf_sat_release);
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return 0;
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}
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static const struct i2c_device_id wf_sat_id[] = {
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{ "MAC,smu-sat", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, wf_sat_id);
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static const struct of_device_id wf_sat_of_id[] = {
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{ .compatible = "smu-sat", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, wf_sat_of_id);
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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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.of_match_table = wf_sat_of_id,
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},
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.probe = wf_sat_probe,
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.remove = wf_sat_remove,
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.id_table = wf_sat_id,
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};
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module_i2c_driver(wf_sat_driver);
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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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