X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fmacintosh%2Fwindfarm_smu_sat.c;fp=kernel%2Fdrivers%2Fmacintosh%2Fwindfarm_smu_sat.c;h=ad6223e8834043ba710c9d1bd5c41ae2a156dfbe;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/macintosh/windfarm_smu_sat.c b/kernel/drivers/macintosh/windfarm_smu_sat.c new file mode 100644 index 000000000..ad6223e88 --- /dev/null +++ b/kernel/drivers/macintosh/windfarm_smu_sat.c @@ -0,0 +1,370 @@ +/* + * Windfarm PowerMac thermal control. SMU "satellite" controller sensors. + * + * Copyright (C) 2005 Paul Mackerras, IBM Corp. + * + * Released under the terms of the GNU GPL v2. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "windfarm.h" + +#define VERSION "1.0" + +#define DEBUG + +#ifdef DEBUG +#define DBG(args...) printk(args) +#else +#define DBG(args...) do { } while(0) +#endif + +/* If the cache is older than 800ms we'll refetch it */ +#define MAX_AGE msecs_to_jiffies(800) + +struct wf_sat { + struct kref ref; + int nr; + struct mutex mutex; + unsigned long last_read; /* jiffies when cache last updated */ + u8 cache[16]; + struct list_head sensors; + struct i2c_client *i2c; + struct device_node *node; +}; + +static struct wf_sat *sats[2]; + +struct wf_sat_sensor { + struct list_head link; + int index; + int index2; /* used for power sensors */ + int shift; + struct wf_sat *sat; + struct wf_sensor sens; +}; + +#define wf_to_sat(c) container_of(c, struct wf_sat_sensor, sens) + +struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id, + unsigned int *size) +{ + struct wf_sat *sat; + int err; + unsigned int i, len; + u8 *buf; + u8 data[4]; + + /* TODO: Add the resulting partition to the device-tree */ + + if (sat_id > 1 || (sat = sats[sat_id]) == NULL) + return NULL; + + err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8); + if (err) { + printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err); + return NULL; + } + + err = i2c_smbus_read_word_data(sat->i2c, 9); + if (err < 0) { + printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n"); + return NULL; + } + len = err; + if (len == 0) { + printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id); + return NULL; + } + + len = le16_to_cpu(len); + len = (len + 3) & ~3; + buf = kmalloc(len, GFP_KERNEL); + if (buf == NULL) + return NULL; + + for (i = 0; i < len; i += 4) { + err = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data); + if (err < 0) { + printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n", + err); + goto fail; + } + buf[i] = data[1]; + buf[i+1] = data[0]; + buf[i+2] = data[3]; + buf[i+3] = data[2]; + } +#ifdef DEBUG + DBG(KERN_DEBUG "sat %d partition %x:", sat_id, id); + for (i = 0; i < len; ++i) + DBG(" %x", buf[i]); + DBG("\n"); +#endif + + if (size) + *size = len; + return (struct smu_sdbp_header *) buf; + + fail: + kfree(buf); + return NULL; +} +EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition); + +/* refresh the cache */ +static int wf_sat_read_cache(struct wf_sat *sat) +{ + int err; + + err = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache); + if (err < 0) + return err; + sat->last_read = jiffies; +#ifdef LOTSA_DEBUG + { + int i; + DBG(KERN_DEBUG "wf_sat_get: data is"); + for (i = 0; i < 16; ++i) + DBG(" %.2x", sat->cache[i]); + DBG("\n"); + } +#endif + return 0; +} + +static int wf_sat_sensor_get(struct wf_sensor *sr, s32 *value) +{ + struct wf_sat_sensor *sens = wf_to_sat(sr); + struct wf_sat *sat = sens->sat; + int i, err; + s32 val; + + if (sat->i2c == NULL) + return -ENODEV; + + mutex_lock(&sat->mutex); + if (time_after(jiffies, (sat->last_read + MAX_AGE))) { + err = wf_sat_read_cache(sat); + if (err) + goto fail; + } + + i = sens->index * 2; + val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift; + if (sens->index2 >= 0) { + i = sens->index2 * 2; + /* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */ + val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4; + } + + *value = val; + err = 0; + + fail: + mutex_unlock(&sat->mutex); + return err; +} + +static void wf_sat_release(struct kref *ref) +{ + struct wf_sat *sat = container_of(ref, struct wf_sat, ref); + + if (sat->nr >= 0) + sats[sat->nr] = NULL; + kfree(sat); +} + +static void wf_sat_sensor_release(struct wf_sensor *sr) +{ + struct wf_sat_sensor *sens = wf_to_sat(sr); + struct wf_sat *sat = sens->sat; + + kfree(sens); + kref_put(&sat->ref, wf_sat_release); +} + +static struct wf_sensor_ops wf_sat_ops = { + .get_value = wf_sat_sensor_get, + .release = wf_sat_sensor_release, + .owner = THIS_MODULE, +}; + +static int wf_sat_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device_node *dev = client->dev.of_node; + struct wf_sat *sat; + struct wf_sat_sensor *sens; + const u32 *reg; + const char *loc, *type; + u8 chip, core; + struct device_node *child; + int shift, cpu, index; + char *name; + int vsens[2], isens[2]; + + sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL); + if (sat == NULL) + return -ENOMEM; + sat->nr = -1; + sat->node = of_node_get(dev); + kref_init(&sat->ref); + mutex_init(&sat->mutex); + sat->i2c = client; + INIT_LIST_HEAD(&sat->sensors); + i2c_set_clientdata(client, sat); + + vsens[0] = vsens[1] = -1; + isens[0] = isens[1] = -1; + child = NULL; + while ((child = of_get_next_child(dev, child)) != NULL) { + reg = of_get_property(child, "reg", NULL); + type = of_get_property(child, "device_type", NULL); + loc = of_get_property(child, "location", NULL); + if (reg == NULL || loc == NULL) + continue; + + /* the cooked sensors are between 0x30 and 0x37 */ + if (*reg < 0x30 || *reg > 0x37) + continue; + index = *reg - 0x30; + + /* expect location to be CPU [AB][01] ... */ + if (strncmp(loc, "CPU ", 4) != 0) + continue; + chip = loc[4] - 'A'; + core = loc[5] - '0'; + if (chip > 1 || core > 1) { + printk(KERN_ERR "wf_sat_create: don't understand " + "location %s for %s\n", loc, child->full_name); + continue; + } + cpu = 2 * chip + core; + if (sat->nr < 0) + sat->nr = chip; + else if (sat->nr != chip) { + printk(KERN_ERR "wf_sat_create: can't cope with " + "multiple CPU chips on one SAT (%s)\n", loc); + continue; + } + + if (strcmp(type, "voltage-sensor") == 0) { + name = "cpu-voltage"; + shift = 4; + vsens[core] = index; + } else if (strcmp(type, "current-sensor") == 0) { + name = "cpu-current"; + shift = 8; + isens[core] = index; + } else if (strcmp(type, "temp-sensor") == 0) { + name = "cpu-temp"; + shift = 10; + } else + continue; /* hmmm shouldn't happen */ + + /* the +16 is enough for "cpu-voltage-n" */ + sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL); + if (sens == NULL) { + printk(KERN_ERR "wf_sat_create: couldn't create " + "%s sensor %d (no memory)\n", name, cpu); + continue; + } + sens->index = index; + sens->index2 = -1; + sens->shift = shift; + sens->sat = sat; + sens->sens.ops = &wf_sat_ops; + sens->sens.name = (char *) (sens + 1); + snprintf((char *)sens->sens.name, 16, "%s-%d", name, cpu); + + if (wf_register_sensor(&sens->sens)) + kfree(sens); + else { + list_add(&sens->link, &sat->sensors); + kref_get(&sat->ref); + } + } + + /* make the power sensors */ + for (core = 0; core < 2; ++core) { + if (vsens[core] < 0 || isens[core] < 0) + continue; + cpu = 2 * sat->nr + core; + sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL); + if (sens == NULL) { + printk(KERN_ERR "wf_sat_create: couldn't create power " + "sensor %d (no memory)\n", cpu); + continue; + } + sens->index = vsens[core]; + sens->index2 = isens[core]; + sens->shift = 0; + sens->sat = sat; + sens->sens.ops = &wf_sat_ops; + sens->sens.name = (char *) (sens + 1); + snprintf((char *)sens->sens.name, 16, "cpu-power-%d", cpu); + + if (wf_register_sensor(&sens->sens)) + kfree(sens); + else { + list_add(&sens->link, &sat->sensors); + kref_get(&sat->ref); + } + } + + if (sat->nr >= 0) + sats[sat->nr] = sat; + + return 0; +} + +static int wf_sat_remove(struct i2c_client *client) +{ + struct wf_sat *sat = i2c_get_clientdata(client); + struct wf_sat_sensor *sens; + + /* release sensors */ + while(!list_empty(&sat->sensors)) { + sens = list_first_entry(&sat->sensors, + struct wf_sat_sensor, link); + list_del(&sens->link); + wf_unregister_sensor(&sens->sens); + } + sat->i2c = NULL; + kref_put(&sat->ref, wf_sat_release); + + return 0; +} + +static const struct i2c_device_id wf_sat_id[] = { + { "MAC,smu-sat", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, wf_sat_id); + +static struct i2c_driver wf_sat_driver = { + .driver = { + .name = "wf_smu_sat", + }, + .probe = wf_sat_probe, + .remove = wf_sat_remove, + .id_table = wf_sat_id, +}; + +module_i2c_driver(wf_sat_driver); + +MODULE_AUTHOR("Paul Mackerras "); +MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control"); +MODULE_LICENSE("GPL");