// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved
*/
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/slab.h>
#include <soc/tegra/bpmp.h>
#include <soc/tegra/bpmp-abi.h>
struct tegra_powergate_info {
unsigned int id;
char *name;
};
struct tegra_powergate {
struct generic_pm_domain genpd;
struct tegra_bpmp *bpmp;
unsigned int id;
};
static inline struct tegra_powergate *
to_tegra_powergate(struct generic_pm_domain *genpd)
{
return container_of(genpd, struct tegra_powergate, genpd);
}
static int tegra_bpmp_powergate_set_state(struct tegra_bpmp *bpmp,
unsigned int id, u32 state)
{
struct mrq_pg_request request;
struct tegra_bpmp_message msg;
int err;
memset(&request, 0, sizeof(request));
request.cmd = CMD_PG_SET_STATE;
request.id = id;
request.set_state.state = state;
memset(&msg, 0, sizeof(msg));
msg.mrq = MRQ_PG;
msg.tx.data = &request;
msg.tx.size = sizeof(request);
err = tegra_bpmp_transfer(bpmp, &msg);
if (err < 0)
return err;
else if (msg.rx.ret < 0)
return -EINVAL;
return 0;
}
static int tegra_bpmp_powergate_get_state(struct tegra_bpmp *bpmp,
unsigned int id)
{
struct mrq_pg_response response;
struct mrq_pg_request request;
struct tegra_bpmp_message msg;
int err;
memset(&request, 0, sizeof(request));
request.cmd = CMD_PG_GET_STATE;
request.id = id;
memset(&response, 0, sizeof(response));
memset(&msg, 0, sizeof(msg));
msg.mrq = MRQ_PG;
msg.tx.data = &request;
msg.tx.size = sizeof(request);
msg.rx.data = &response;
msg.rx.size = sizeof(response);
err = tegra_bpmp_transfer(bpmp, &msg);
if (err < 0)
return PG_STATE_OFF;
else if (msg.rx.ret < 0)
return -EINVAL;
return response.get_state.state;
}
static int tegra_bpmp_powergate_get_max_id(struct tegra_bpmp *bpmp)
{
struct mrq_pg_response response;
struct mrq_pg_request request;
struct tegra_bpmp_message msg;
int err;
memset(&request, 0, sizeof(request));
request.cmd = CMD_PG_GET_MAX_ID;
memset(&response, 0, sizeof(response));
memset(&msg, 0, sizeof(msg));
msg.mrq = MRQ_PG;
msg.tx.data = &request;
msg.tx.size = sizeof(request);
msg.rx.data = &response;
msg.rx.size = sizeof(response);
err = tegra_bpmp_transfer(bpmp, &msg);
if (err < 0)
return err;
else if (msg.rx.ret < 0)
return -EINVAL;
return response.get_max_id.max_id;
}
static char *tegra_bpmp_powergate_get_name(struct tegra_bpmp *bpmp,
unsigned int id)
{
struct mrq_pg_response response;
struct mrq_pg_request request;
struct tegra_bpmp_message msg;
int err;
memset(&request, 0, sizeof(request));
request.cmd = CMD_PG_GET_NAME;
request.id = id;
memset(&response, 0, sizeof(response));
memset(&msg, 0, sizeof(msg));
msg.mrq = MRQ_PG;
msg.tx.data = &request;
msg.tx.size = sizeof(request);
msg.rx.data = &response;
msg.rx.size = sizeof(response);
err = tegra_bpmp_transfer(bpmp, &msg);
if (err < 0 || msg.rx.ret < 0)
return NULL;
return kstrdup(response.get_name.name, GFP_KERNEL);
}
static inline bool tegra_bpmp_powergate_is_powered(struct tegra_bpmp *bpmp,
unsigned int id)
{
return tegra_bpmp_powergate_get_state(bpmp, id) != PG_STATE_OFF;
}
static int tegra_powergate_power_on(struct generic_pm_domain *domain)
{
struct tegra_powergate *powergate = to_tegra_powergate(domain);
struct tegra_bpmp *bpmp = powergate->bpmp;
return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
PG_STATE_ON);
}
static int tegra_powergate_power_off(struct generic_pm_domain *domain)
{
struct tegra_powergate *powergate = to_tegra_powergate(domain);
struct tegra_bpmp *bpmp = powergate->bpmp;
return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
PG_STATE_OFF);
}
static struct tegra_powergate *
tegra_powergate_add(struct tegra_bpmp *bpmp,
const struct tegra_powergate_info *info)
{
struct tegra_powergate *powergate;
bool off;
int err;
off = !tegra_bpmp_powergate_is_powered(bpmp, info->id);
powergate = devm_kzalloc(bpmp->dev, sizeof(*powergate), GFP_KERNEL);
if (!powergate)
return ERR_PTR(-ENOMEM);
powergate->id = info->id;
powergate->bpmp = bpmp;
powergate->genpd.name = kstrdup(info->name, GFP_KERNEL);
powergate->genpd.power_on = tegra_powergate_power_on;
powergate->genpd.power_off = tegra_powergate_power_off;
err = pm_genpd_init(&powergate->genpd, NULL, off);
if (err < 0) {
kfree(powergate->genpd.name);
return ERR_PTR(err);
}
return powergate;
}
static void tegra_powergate_remove(struct tegra_powergate *powergate)
{
struct generic_pm_domain *genpd = &powergate->genpd;
struct tegra_bpmp *bpmp = powergate->bpmp;
int err;
err = pm_genpd_remove(genpd);
if (err < 0)
dev_err(bpmp->dev, "failed to remove power domain %s: %d\n",
genpd->name, err);
kfree(genpd->name);
}
static int
tegra_bpmp_probe_powergates(struct tegra_bpmp *bpmp,
struct tegra_powergate_info **powergatesp)
{
struct tegra_powergate_info *powergates;
unsigned int max_id, id, count = 0;
unsigned int num_holes = 0;
int err;
err = tegra_bpmp_powergate_get_max_id(bpmp);
if (err < 0)
return err;
max_id = err;
dev_dbg(bpmp->dev, "maximum powergate ID: %u\n", max_id);
powergates = kcalloc(max_id + 1, sizeof(*powergates), GFP_KERNEL);
if (!powergates)
return -ENOMEM;
for (id = 0; id <= max_id; id++) {
struct tegra_powergate_info *info = &powergates[count];
info->name = tegra_bpmp_powergate_get_name(bpmp, id);
if (!info->name || info->name[0] == '\0') {
num_holes++;
continue;
}
info->id = id;
count++;
}
dev_dbg(bpmp->dev, "holes: %u\n", num_holes);
*powergatesp = powergates;
return count;
}
static int tegra_bpmp_add_powergates(struct tegra_bpmp *bpmp,
struct tegra_powergate_info *powergates,
unsigned int count)
{
struct genpd_onecell_data *genpd = &bpmp->genpd;
struct generic_pm_domain **domains;
struct tegra_powergate *powergate;
unsigned int i;
int err;
domains = kcalloc(count, sizeof(*domains), GFP_KERNEL);
if (!domains)
return -ENOMEM;
for (i = 0; i < count; i++) {
powergate = tegra_powergate_add(bpmp, &powergates[i]);
if (IS_ERR(powergate)) {
err = PTR_ERR(powergate);
goto remove;
}
dev_dbg(bpmp->dev, "added power domain %s\n",
powergate->genpd.name);
domains[i] = &powergate->genpd;
}
genpd->num_domains = count;
genpd->domains = domains;
return 0;
remove:
while (i--) {
powergate = to_tegra_powergate(domains[i]);
tegra_powergate_remove(powergate);
}
kfree(domains);
return err;
}
static void tegra_bpmp_remove_powergates(struct tegra_bpmp *bpmp)
{
struct genpd_onecell_data *genpd = &bpmp->genpd;
unsigned int i = genpd->num_domains;
struct tegra_powergate *powergate;
while (i--) {
dev_dbg(bpmp->dev, "removing power domain %s\n",
genpd->domains[i]->name);
powergate = to_tegra_powergate(genpd->domains[i]);
tegra_powergate_remove(powergate);
}
}
static struct generic_pm_domain *
tegra_powergate_xlate(const struct of_phandle_args *spec, void *data)
{
struct generic_pm_domain *domain = ERR_PTR(-ENOENT);
struct genpd_onecell_data *genpd = data;
unsigned int i;
for (i = 0; i < genpd->num_domains; i++) {
struct tegra_powergate *powergate;
powergate = to_tegra_powergate(genpd->domains[i]);
if (powergate->id == spec->args[0]) {
domain = &powergate->genpd;
break;
}
}
return domain;
}
int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp)
{
struct device_node *np = bpmp->dev->of_node;
struct tegra_powergate_info *powergates;
struct device *dev = bpmp->dev;
unsigned int count, i;
int err;
err = tegra_bpmp_probe_powergates(bpmp, &powergates);
if (err < 0)
return err;
count = err;
dev_dbg(dev, "%u power domains probed\n", count);
err = tegra_bpmp_add_powergates(bpmp, powergates, count);
if (err < 0)
goto free;
bpmp->genpd.xlate = tegra_powergate_xlate;
err = of_genpd_add_provider_onecell(np, &bpmp->genpd);
if (err < 0) {
dev_err(dev, "failed to add power domain provider: %d\n", err);
tegra_bpmp_remove_powergates(bpmp);
}
free:
for (i = 0; i < count; i++)
kfree(powergates[i].name);
kfree(powergates);
return err;
}
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