soc: tegra: Move powergate-bpmp driver to the genpd dir

To simplify with maintenance let's move the powergate-bpmp driver to the
new genpd directory. Going forward, patches are intended to be managed
through a separate git tree, according to MAINTAINERS.

Note that, we leave the pmc driver in the soc directory for now, as it
looks like it may need some re-structuring before it's ready to be moved.

Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Mikko Perttunen <mperttunen@nvidia.com>
Cc: <linux-tegra@vger.kernel.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

3 files changed, 364 insertions, 0 deletions

diff --git a/drivers/genpd/Makefile b/drivers/genpd/Makefile
index 76f2a411e6bc..e6f34d82e6a8 100644
--- a/drivers/genpd/Makefile
+++ b/drivers/genpd/Makefile
@@ -10,3 +10,4 @@ obj-y					+= rockchip/
 obj-y					+= samsung/
 obj-y					+= starfive/
 obj-y					+= sunxi/
+obj-y					+= tegra/
diff --git a/drivers/genpd/tegra/Makefile b/drivers/genpd/tegra/Makefile
new file mode 100644
index 000000000000..ec8acfd2c77c
--- /dev/null
+++ b/drivers/genpd/tegra/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_SOC_TEGRA_POWERGATE_BPMP)	+= powergate-bpmp.o
diff --git a/drivers/genpd/tegra/powergate-bpmp.c b/drivers/genpd/tegra/powergate-bpmp.c
new file mode 100644
index 000000000000..179ed895c279
--- /dev/null
+++ b/drivers/genpd/tegra/powergate-bpmp.c
@@ -0,0 +1,361 @@
+// 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(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;
+}