![Qinglang Miao](/assets/img/avatar_default.png)
Use for_each_child_of_node() macro instead of open coding it. Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200916062125.190729-1-miaoqinglang@huawei.com
480 lines
11 KiB
C
480 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Windfarm PowerMac thermal control. SMU based sensors
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*
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* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.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/delay.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/completion.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#include <asm/sections.h>
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#include <asm/smu.h>
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#include "windfarm.h"
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#define VERSION "0.2"
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#undef 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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/*
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* Various SMU "partitions" calibration objects for which we
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* keep pointers here for use by bits & pieces of the driver
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*/
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static struct smu_sdbp_cpuvcp *cpuvcp;
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static int cpuvcp_version;
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static struct smu_sdbp_cpudiode *cpudiode;
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static struct smu_sdbp_slotspow *slotspow;
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static u8 *debugswitches;
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/*
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* SMU basic sensors objects
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*/
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static LIST_HEAD(smu_ads);
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struct smu_ad_sensor {
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struct list_head link;
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u32 reg; /* index in SMU */
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struct wf_sensor sens;
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};
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#define to_smu_ads(c) container_of(c, struct smu_ad_sensor, sens)
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static void smu_ads_release(struct wf_sensor *sr)
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{
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struct smu_ad_sensor *ads = to_smu_ads(sr);
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kfree(ads);
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}
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static int smu_read_adc(u8 id, s32 *value)
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{
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struct smu_simple_cmd cmd;
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DECLARE_COMPLETION_ONSTACK(comp);
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int rc;
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rc = smu_queue_simple(&cmd, SMU_CMD_READ_ADC, 1,
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smu_done_complete, &comp, id);
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if (rc)
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return rc;
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wait_for_completion(&comp);
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if (cmd.cmd.status != 0)
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return cmd.cmd.status;
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if (cmd.cmd.reply_len != 2) {
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printk(KERN_ERR "winfarm: read ADC 0x%x returned %d bytes !\n",
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id, cmd.cmd.reply_len);
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return -EIO;
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}
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*value = *((u16 *)cmd.buffer);
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return 0;
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}
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static int smu_cputemp_get(struct wf_sensor *sr, s32 *value)
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{
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struct smu_ad_sensor *ads = to_smu_ads(sr);
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int rc;
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s32 val;
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s64 scaled;
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rc = smu_read_adc(ads->reg, &val);
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if (rc) {
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printk(KERN_ERR "windfarm: read CPU temp failed, err %d\n",
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rc);
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return rc;
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}
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/* Ok, we have to scale & adjust, taking units into account */
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scaled = (s64)(((u64)val) * (u64)cpudiode->m_value);
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scaled >>= 3;
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scaled += ((s64)cpudiode->b_value) << 9;
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*value = (s32)(scaled << 1);
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return 0;
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}
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static int smu_cpuamp_get(struct wf_sensor *sr, s32 *value)
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{
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struct smu_ad_sensor *ads = to_smu_ads(sr);
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s32 val, scaled;
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int rc;
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rc = smu_read_adc(ads->reg, &val);
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if (rc) {
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printk(KERN_ERR "windfarm: read CPU current failed, err %d\n",
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rc);
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return rc;
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}
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/* Ok, we have to scale & adjust, taking units into account */
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scaled = (s32)(val * (u32)cpuvcp->curr_scale);
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scaled += (s32)cpuvcp->curr_offset;
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*value = scaled << 4;
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return 0;
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}
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static int smu_cpuvolt_get(struct wf_sensor *sr, s32 *value)
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{
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struct smu_ad_sensor *ads = to_smu_ads(sr);
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s32 val, scaled;
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int rc;
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rc = smu_read_adc(ads->reg, &val);
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if (rc) {
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printk(KERN_ERR "windfarm: read CPU voltage failed, err %d\n",
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rc);
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return rc;
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}
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/* Ok, we have to scale & adjust, taking units into account */
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scaled = (s32)(val * (u32)cpuvcp->volt_scale);
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scaled += (s32)cpuvcp->volt_offset;
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*value = scaled << 4;
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return 0;
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}
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static int smu_slotspow_get(struct wf_sensor *sr, s32 *value)
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{
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struct smu_ad_sensor *ads = to_smu_ads(sr);
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s32 val, scaled;
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int rc;
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rc = smu_read_adc(ads->reg, &val);
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if (rc) {
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printk(KERN_ERR "windfarm: read slots power failed, err %d\n",
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rc);
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return rc;
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}
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/* Ok, we have to scale & adjust, taking units into account */
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scaled = (s32)(val * (u32)slotspow->pow_scale);
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scaled += (s32)slotspow->pow_offset;
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*value = scaled << 4;
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return 0;
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}
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static const struct wf_sensor_ops smu_cputemp_ops = {
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.get_value = smu_cputemp_get,
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.release = smu_ads_release,
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.owner = THIS_MODULE,
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};
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static const struct wf_sensor_ops smu_cpuamp_ops = {
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.get_value = smu_cpuamp_get,
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.release = smu_ads_release,
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.owner = THIS_MODULE,
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};
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static const struct wf_sensor_ops smu_cpuvolt_ops = {
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.get_value = smu_cpuvolt_get,
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.release = smu_ads_release,
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.owner = THIS_MODULE,
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};
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static const struct wf_sensor_ops smu_slotspow_ops = {
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.get_value = smu_slotspow_get,
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.release = smu_ads_release,
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.owner = THIS_MODULE,
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};
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static struct smu_ad_sensor *smu_ads_create(struct device_node *node)
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{
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struct smu_ad_sensor *ads;
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const char *l;
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const u32 *v;
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ads = kmalloc(sizeof(struct smu_ad_sensor), GFP_KERNEL);
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if (ads == NULL)
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return NULL;
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l = of_get_property(node, "location", NULL);
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if (l == NULL)
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goto fail;
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/* We currently pick the sensors based on the OF name and location
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* properties, while Darwin uses the sensor-id's.
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* The problem with the IDs is that they are model specific while it
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* looks like apple has been doing a reasonably good job at keeping
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* the names and locations consistents so I'll stick with the names
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* and locations for now.
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*/
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if (of_node_is_type(node, "temp-sensor") &&
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!strcmp(l, "CPU T-Diode")) {
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ads->sens.ops = &smu_cputemp_ops;
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ads->sens.name = "cpu-temp";
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if (cpudiode == NULL) {
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DBG("wf: cpudiode partition (%02x) not found\n",
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SMU_SDB_CPUDIODE_ID);
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goto fail;
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}
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} else if (of_node_is_type(node, "current-sensor") &&
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!strcmp(l, "CPU Current")) {
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ads->sens.ops = &smu_cpuamp_ops;
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ads->sens.name = "cpu-current";
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if (cpuvcp == NULL) {
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DBG("wf: cpuvcp partition (%02x) not found\n",
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SMU_SDB_CPUVCP_ID);
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goto fail;
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}
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} else if (of_node_is_type(node, "voltage-sensor") &&
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!strcmp(l, "CPU Voltage")) {
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ads->sens.ops = &smu_cpuvolt_ops;
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ads->sens.name = "cpu-voltage";
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if (cpuvcp == NULL) {
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DBG("wf: cpuvcp partition (%02x) not found\n",
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SMU_SDB_CPUVCP_ID);
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goto fail;
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}
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} else if (of_node_is_type(node, "power-sensor") &&
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!strcmp(l, "Slots Power")) {
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ads->sens.ops = &smu_slotspow_ops;
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ads->sens.name = "slots-power";
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if (slotspow == NULL) {
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DBG("wf: slotspow partition (%02x) not found\n",
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SMU_SDB_SLOTSPOW_ID);
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goto fail;
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}
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} else
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goto fail;
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v = of_get_property(node, "reg", NULL);
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if (v == NULL)
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goto fail;
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ads->reg = *v;
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if (wf_register_sensor(&ads->sens))
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goto fail;
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return ads;
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fail:
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kfree(ads);
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return NULL;
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}
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/*
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* SMU Power combo sensor object
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*/
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struct smu_cpu_power_sensor {
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struct list_head link;
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struct wf_sensor *volts;
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struct wf_sensor *amps;
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int fake_volts : 1;
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int quadratic : 1;
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struct wf_sensor sens;
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};
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#define to_smu_cpu_power(c) container_of(c, struct smu_cpu_power_sensor, sens)
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static struct smu_cpu_power_sensor *smu_cpu_power;
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static void smu_cpu_power_release(struct wf_sensor *sr)
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{
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struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
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if (pow->volts)
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wf_put_sensor(pow->volts);
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if (pow->amps)
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wf_put_sensor(pow->amps);
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kfree(pow);
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}
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static int smu_cpu_power_get(struct wf_sensor *sr, s32 *value)
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{
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struct smu_cpu_power_sensor *pow = to_smu_cpu_power(sr);
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s32 volts, amps, power;
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u64 tmps, tmpa, tmpb;
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int rc;
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rc = pow->amps->ops->get_value(pow->amps, &s);
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if (rc)
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return rc;
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if (pow->fake_volts) {
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*value = amps * 12 - 0x30000;
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return 0;
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}
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rc = pow->volts->ops->get_value(pow->volts, &volts);
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if (rc)
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return rc;
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power = (s32)((((u64)volts) * ((u64)amps)) >> 16);
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if (!pow->quadratic) {
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*value = power;
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return 0;
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}
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tmps = (((u64)power) * ((u64)power)) >> 16;
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tmpa = ((u64)cpuvcp->power_quads[0]) * tmps;
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tmpb = ((u64)cpuvcp->power_quads[1]) * ((u64)power);
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*value = (tmpa >> 28) + (tmpb >> 28) + (cpuvcp->power_quads[2] >> 12);
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return 0;
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}
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static const struct wf_sensor_ops smu_cpu_power_ops = {
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.get_value = smu_cpu_power_get,
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.release = smu_cpu_power_release,
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.owner = THIS_MODULE,
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};
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static struct smu_cpu_power_sensor *
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smu_cpu_power_create(struct wf_sensor *volts, struct wf_sensor *amps)
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{
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struct smu_cpu_power_sensor *pow;
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pow = kmalloc(sizeof(struct smu_cpu_power_sensor), GFP_KERNEL);
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if (pow == NULL)
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return NULL;
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pow->sens.ops = &smu_cpu_power_ops;
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pow->sens.name = "cpu-power";
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wf_get_sensor(volts);
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pow->volts = volts;
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wf_get_sensor(amps);
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pow->amps = amps;
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/* Some early machines need a faked voltage */
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if (debugswitches && ((*debugswitches) & 0x80)) {
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printk(KERN_INFO "windfarm: CPU Power sensor using faked"
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" voltage !\n");
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pow->fake_volts = 1;
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} else
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pow->fake_volts = 0;
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/* Try to use quadratic transforms on PowerMac8,1 and 9,1 for now,
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* I yet have to figure out what's up with 8,2 and will have to
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* adjust for later, unless we can 100% trust the SDB partition...
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*/
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if ((of_machine_is_compatible("PowerMac8,1") ||
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of_machine_is_compatible("PowerMac8,2") ||
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of_machine_is_compatible("PowerMac9,1")) &&
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cpuvcp_version >= 2) {
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pow->quadratic = 1;
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DBG("windfarm: CPU Power using quadratic transform\n");
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} else
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pow->quadratic = 0;
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if (wf_register_sensor(&pow->sens))
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goto fail;
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return pow;
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fail:
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kfree(pow);
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return NULL;
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}
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static void smu_fetch_param_partitions(void)
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{
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const struct smu_sdbp_header *hdr;
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/* Get CPU voltage/current/power calibration data */
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hdr = smu_get_sdb_partition(SMU_SDB_CPUVCP_ID, NULL);
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if (hdr != NULL) {
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cpuvcp = (struct smu_sdbp_cpuvcp *)&hdr[1];
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/* Keep version around */
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cpuvcp_version = hdr->version;
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}
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/* Get CPU diode calibration data */
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hdr = smu_get_sdb_partition(SMU_SDB_CPUDIODE_ID, NULL);
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if (hdr != NULL)
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cpudiode = (struct smu_sdbp_cpudiode *)&hdr[1];
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/* Get slots power calibration data if any */
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hdr = smu_get_sdb_partition(SMU_SDB_SLOTSPOW_ID, NULL);
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if (hdr != NULL)
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slotspow = (struct smu_sdbp_slotspow *)&hdr[1];
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/* Get debug switches if any */
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hdr = smu_get_sdb_partition(SMU_SDB_DEBUG_SWITCHES_ID, NULL);
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if (hdr != NULL)
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debugswitches = (u8 *)&hdr[1];
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}
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static int __init smu_sensors_init(void)
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{
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struct device_node *smu, *sensors, *s;
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struct smu_ad_sensor *volt_sensor = NULL, *curr_sensor = NULL;
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if (!smu_present())
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return -ENODEV;
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/* Get parameters partitions */
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smu_fetch_param_partitions();
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smu = of_find_node_by_type(NULL, "smu");
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if (smu == NULL)
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return -ENODEV;
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/* Look for sensors subdir */
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for_each_child_of_node(smu, sensors)
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if (of_node_name_eq(sensors, "sensors"))
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break;
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of_node_put(smu);
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/* Create basic sensors */
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for (s = NULL;
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sensors && (s = of_get_next_child(sensors, s)) != NULL;) {
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struct smu_ad_sensor *ads;
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ads = smu_ads_create(s);
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if (ads == NULL)
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continue;
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list_add(&ads->link, &smu_ads);
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/* keep track of cpu voltage & current */
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if (!strcmp(ads->sens.name, "cpu-voltage"))
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volt_sensor = ads;
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else if (!strcmp(ads->sens.name, "cpu-current"))
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curr_sensor = ads;
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}
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of_node_put(sensors);
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/* Create CPU power sensor if possible */
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if (volt_sensor && curr_sensor)
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smu_cpu_power = smu_cpu_power_create(&volt_sensor->sens,
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&curr_sensor->sens);
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return 0;
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}
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static void __exit smu_sensors_exit(void)
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{
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struct smu_ad_sensor *ads;
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/* dispose of power sensor */
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if (smu_cpu_power)
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wf_unregister_sensor(&smu_cpu_power->sens);
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/* dispose of basic sensors */
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while (!list_empty(&smu_ads)) {
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ads = list_entry(smu_ads.next, struct smu_ad_sensor, link);
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list_del(&ads->link);
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wf_unregister_sensor(&ads->sens);
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}
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}
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module_init(smu_sensors_init);
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module_exit(smu_sensors_exit);
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MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
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MODULE_DESCRIPTION("SMU sensor objects for PowerMacs thermal control");
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MODULE_LICENSE("GPL");
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