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// SPDX-License-Identifier: GPL-2.0
/*
* GXP power management.
*
* Copyright (C) 2021 Google LLC
*/
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/refcount.h>
#include <linux/types.h>
#ifdef CONFIG_GXP_CLOUDRIPPER
#include <linux/acpm_dvfs.h>
#endif
#include "gxp-bpm.h"
#include "gxp-doorbell.h"
#include "gxp-internal.h"
#include "gxp-lpm.h"
#include "gxp-pm.h"
static struct gxp_pm_device_ops gxp_aur_ops = {
.pre_blk_powerup = NULL,
.post_blk_powerup = NULL,
.pre_blk_poweroff = NULL,
.post_blk_poweroff = NULL,
};
static int gxp_pm_blkpwr_up(struct gxp_dev *gxp)
{
int ret = 0;
#ifdef CONFIG_GXP_CLOUDRIPPER
ret = pm_runtime_get_sync(gxp->dev);
if (ret)
dev_err(gxp->dev, "%s: pm_runtime_get_sync returned %d\n",
__func__, ret);
#endif
return ret;
}
static int gxp_pm_blkpwr_down(struct gxp_dev *gxp)
{
int ret = 0;
#ifdef CONFIG_GXP_CLOUDRIPPER
/*
* Need to put TOP LPM into active state before blk off
* b/189396709
*/
lpm_write_32_psm(gxp, LPM_TOP_PSM, LPM_REG_ENABLE_STATE_1, 0x0);
lpm_write_32_psm(gxp, LPM_TOP_PSM, LPM_REG_ENABLE_STATE_2, 0x0);
ret = pm_runtime_put_sync(gxp->dev);
if (ret)
dev_err(gxp->dev, "%s: pm_runtime_put_sync returned %d\n",
__func__, ret);
#endif
return ret;
}
int gxp_pm_blk_set_state_acpm(struct gxp_dev *gxp, unsigned long state)
{
int ret = 0;
#ifdef CONFIG_GXP_CLOUDRIPPER
ret = exynos_acpm_set_rate(AUR_DVFS_DOMAIN, state);
dev_dbg(gxp->dev, "%s: state %lu, ret %d\n", __func__, state, ret);
#endif
return ret;
}
int gxp_pm_blk_get_state_acpm(struct gxp_dev *gxp)
{
int ret = 0;
#ifdef CONFIG_GXP_CLOUDRIPPER
ret = exynos_acpm_get_rate(AUR_DVFS_DOMAIN, AUR_DEBUG_CORE_FREQ);
dev_dbg(gxp->dev, "%s: state %d\n", __func__, ret);
#endif
return ret;
}
int gxp_pm_blk_on(struct gxp_dev *gxp)
{
int ret = 0;
if (WARN_ON(!gxp->power_mgr)) {
dev_err(gxp->dev, "%s: No PM found\n", __func__);
return -ENODEV;
}
mutex_lock(&gxp->power_mgr->pm_lock);
ret = gxp_pm_blkpwr_up(gxp);
if (!ret) {
gxp_pm_blk_set_state_acpm(gxp, AUR_INIT_DVFS_STATE);
gxp->power_mgr->curr_state = AUR_INIT_DVFS_STATE;
}
mutex_unlock(&gxp->power_mgr->pm_lock);
return ret;
}
int gxp_pm_blk_off(struct gxp_dev *gxp)
{
int ret = 0;
if (WARN_ON(!gxp->power_mgr)) {
dev_err(gxp->dev, "%s: No PM found\n", __func__);
return -ENODEV;
}
mutex_lock(&gxp->power_mgr->pm_lock);
if (refcount_read(&(gxp->power_mgr->blk_wake_ref))) {
dev_err(gxp->dev, "%s: Wake lock not released\n", __func__);
mutex_unlock(&gxp->power_mgr->pm_lock);
return -EBUSY;
}
ret = gxp_pm_blkpwr_down(gxp);
if (!ret)
gxp->power_mgr->curr_state = AUR_OFF;
mutex_unlock(&gxp->power_mgr->pm_lock);
return ret;
}
int gxp_pm_get_blk_state(struct gxp_dev *gxp)
{
int ret;
if (!gxp->power_mgr) {
dev_err(gxp->dev, "%s: No PM found\n", __func__);
return -ENODEV;
}
mutex_lock(&gxp->power_mgr->pm_lock);
ret = gxp->power_mgr->curr_state;
mutex_unlock(&gxp->power_mgr->pm_lock);
return ret;
}
int gxp_pm_core_on(struct gxp_dev *gxp, uint core)
{
int ret = 0;
/*
* Check if TOP LPM is already on.
*/
WARN_ON(!gxp_lpm_is_initialized(gxp, LPM_TOP_PSM));
mutex_lock(&gxp->power_mgr->pm_lock);
ret = gxp_lpm_up(gxp, core);
if (ret) {
dev_err(gxp->dev, "%s: Core %d on fail\n", __func__, core);
mutex_unlock(&gxp->power_mgr->pm_lock);
return ret;
}
gxp->power_mgr->pwr_state_req[core] = gxp->power_mgr->curr_state;
mutex_unlock(&gxp->power_mgr->pm_lock);
dev_notice(gxp->dev, "%s: Core %d up\n", __func__, core);
return ret;
}
int gxp_pm_core_off(struct gxp_dev *gxp, uint core)
{
/*
* Check if TOP LPM is already on.
*/
WARN_ON(!gxp_lpm_is_initialized(gxp, LPM_TOP_PSM));
mutex_lock(&gxp->power_mgr->pm_lock);
gxp_lpm_down(gxp, core);
gxp->power_mgr->pwr_state_req[core] = AUR_OFF;
mutex_unlock(&gxp->power_mgr->pm_lock);
/*
* TODO: b/199467568 If all cores are off shutdown blk
*/
dev_notice(gxp->dev, "%s: Core %d down\n", __func__, core);
return 0;
}
int gxp_pm_get_core_state(struct gxp_dev *gxp, uint core)
{
int ret;
mutex_lock(&gxp->power_mgr->pm_lock);
ret = gxp->power_mgr->pwr_state_req[core];
mutex_unlock(&gxp->power_mgr->pm_lock);
return ret;
}
int gxp_pm_req_state(struct gxp_dev *gxp, uint core, enum aur_power_state state)
{
int i;
unsigned long curr_max_state = AUR_OFF;
if (core >= GXP_NUM_CORES) {
dev_err(gxp->dev, "Invalid core num %d\n", core);
return -EINVAL;
}
if (state > AUR_MAX_ALLOW_STATE) {
dev_err(gxp->dev, "Invalid state %d\n", state);
return -EINVAL;
}
mutex_lock(&gxp->power_mgr->pm_lock);
gxp->power_mgr->pwr_state_req[core] = state;
for (i = 0; i < GXP_NUM_CORES; i++) {
if (gxp->power_mgr->pwr_state_req[i] >= curr_max_state)
curr_max_state = gxp->power_mgr->pwr_state_req[i];
}
if (state == AUR_OFF)
gxp_pm_core_off(gxp, core);
if (curr_max_state != gxp->power_mgr->curr_state &&
curr_max_state > AUR_OFF) {
gxp_pm_blk_set_state_acpm(gxp, curr_max_state);
gxp->power_mgr->curr_state = curr_max_state;
} else {
/*
* TODO: b/199467568 If all cores are off shutdown blk
*/
}
mutex_unlock(&gxp->power_mgr->pm_lock);
return 0;
}
int gxp_pm_acquire_blk_wakelock(struct gxp_dev *gxp)
{
mutex_lock(&gxp->power_mgr->pm_lock);
refcount_inc(&(gxp->power_mgr->blk_wake_ref));
dev_dbg(gxp->dev, "Blk wakelock ref count: %d\n",
refcount_read(&(gxp->power_mgr->blk_wake_ref)));
mutex_unlock(&gxp->power_mgr->pm_lock);
return 0;
}
int gxp_pm_release_blk_wakelock(struct gxp_dev *gxp)
{
mutex_lock(&gxp->power_mgr->pm_lock);
if (refcount_read(&(gxp->power_mgr->blk_wake_ref))) {
refcount_dec(&(gxp->power_mgr->blk_wake_ref));
} else {
dev_err(gxp->dev, "Blk wakelock is already zero\n");
WARN_ON(1);
mutex_unlock(&gxp->power_mgr->pm_lock);
return -EIO;
}
mutex_unlock(&gxp->power_mgr->pm_lock);
dev_notice(gxp->dev, "Release blk wakelock\n");
return 0;
}
int gxp_pm_init(struct gxp_dev *gxp)
{
struct gxp_power_manager *mgr;
int i;
mgr = devm_kzalloc(gxp->dev, sizeof(*mgr), GFP_KERNEL);
if (!mgr)
return -ENOMEM;
mgr->gxp = gxp;
mutex_init(&mgr->pm_lock);
mgr->curr_state = AUR_OFF;
refcount_set(&(mgr->blk_wake_ref), 0);
for (i = 0; i < GXP_NUM_CORES; i++)
mgr->pwr_state_req[i] = AUR_OFF;
mgr->ops = &gxp_aur_ops;
gxp->power_mgr = mgr;
return 0;
}
int gxp_pm_destroy(struct gxp_dev *gxp)
{
struct gxp_power_manager *mgr;
mgr = gxp->power_mgr;
mutex_destroy(&mgr->pm_lock);
return 0;
}
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