// SPDX-License-Identifier: GPL-2.0-only /* * Windfarm PowerMac thermal control. SMU "satellite" controller sensors. * * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org> */ #include <linux/types.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/wait.h> #include <linux/i2c.h> #include <linux/mutex.h> #include <asm/prom.h> #include <asm/smu.h> #include <asm/pmac_low_i2c.h> #include "windfarm.h" #define VERSION "1.0" /* 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]; } printk(KERN_DEBUG "sat %d partition %x:", sat_id, id); print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false); 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; printk(KERN_DEBUG "wf_sat_get: data is"); print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET, 16, 1, sat->cache, 16, false); } #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 const 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; 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; for_each_child_of_node(dev, child) { reg = of_get_property(child, "reg", 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 %pOF\n", loc, child); 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 (of_node_is_type(child, "voltage-sensor")) { name = "cpu-voltage"; shift = 4; vsens[core] = index; } else if (of_node_is_type(child, "current-sensor")) { name = "cpu-current"; shift = 8; isens[core] = index; } else if (of_node_is_type(child, "temp-sensor")) { 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 const struct of_device_id wf_sat_of_id[] = { { .compatible = "smu-sat", }, { } }; MODULE_DEVICE_TABLE(of, wf_sat_of_id); static struct i2c_driver wf_sat_driver = { .driver = { .name = "wf_smu_sat", .of_match_table = wf_sat_of_id, }, .probe = wf_sat_probe, .remove = wf_sat_remove, .id_table = wf_sat_id, }; module_i2c_driver(wf_sat_driver); MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>"); MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control"); MODULE_LICENSE("GPL");