| // 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/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 void 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); |
| } |
| |
| 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"); |