1 files changed, 315 insertions, 0 deletions
diff --git a/drivers/soc/qcom/rpmpd.c b/drivers/soc/qcom/rpmpd.c
new file mode 100644
index 000000000000..005326050c23
--- /dev/null
+++ b/drivers/soc/qcom/rpmpd.c
@@ -0,0 +1,315 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved. */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/pm_domain.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/soc/qcom/smd-rpm.h>
+
+#include <dt-bindings/power/qcom-rpmpd.h>
+
+#define domain_to_rpmpd(domain) container_of(domain, struct rpmpd, pd)
+
+/* Resource types */
+#define RPMPD_SMPA 0x61706d73
+#define RPMPD_LDOA 0x616f646c
+
+/* Operation Keys */
+#define KEY_CORNER		0x6e726f63 /* corn */
+#define KEY_ENABLE		0x6e657773 /* swen */
+#define KEY_FLOOR_CORNER	0x636676   /* vfc */
+
+#define MAX_RPMPD_STATE		6
+
+#define DEFINE_RPMPD_CORNER_SMPA(_platform, _name, _active, r_id)		\
+	static struct rpmpd _platform##_##_active;			\
+	static struct rpmpd _platform##_##_name = {			\
+		.pd = {	.name = #_name,	},				\
+		.peer = &_platform##_##_active,				\
+		.res_type = RPMPD_SMPA,					\
+		.res_id = r_id,						\
+		.key = KEY_CORNER,					\
+	};								\
+	static struct rpmpd _platform##_##_active = {			\
+		.pd = { .name = #_active, },				\
+		.peer = &_platform##_##_name,				\
+		.active_only = true,					\
+		.res_type = RPMPD_SMPA,					\
+		.res_id = r_id,						\
+		.key = KEY_CORNER,					\
+	}
+
+#define DEFINE_RPMPD_CORNER_LDOA(_platform, _name, r_id)			\
+	static struct rpmpd _platform##_##_name = {			\
+		.pd = { .name = #_name, },				\
+		.res_type = RPMPD_LDOA,					\
+		.res_id = r_id,						\
+		.key = KEY_CORNER,					\
+	}
+
+#define DEFINE_RPMPD_VFC(_platform, _name, r_id, r_type)		\
+	static struct rpmpd _platform##_##_name = {			\
+		.pd = { .name = #_name, },				\
+		.res_type = r_type,					\
+		.res_id = r_id,						\
+		.key = KEY_FLOOR_CORNER,				\
+	}
+
+#define DEFINE_RPMPD_VFC_SMPA(_platform, _name, r_id)			\
+	DEFINE_RPMPD_VFC(_platform, _name, r_id, RPMPD_SMPA)
+
+#define DEFINE_RPMPD_VFC_LDOA(_platform, _name, r_id)			\
+	DEFINE_RPMPD_VFC(_platform, _name, r_id, RPMPD_LDOA)
+
+struct rpmpd_req {
+	__le32 key;
+	__le32 nbytes;
+	__le32 value;
+};
+
+struct rpmpd {
+	struct generic_pm_domain pd;
+	struct rpmpd *peer;
+	const bool active_only;
+	unsigned int corner;
+	bool enabled;
+	const char *res_name;
+	const int res_type;
+	const int res_id;
+	struct qcom_smd_rpm *rpm;
+	__le32 key;
+};
+
+struct rpmpd_desc {
+	struct rpmpd **rpmpds;
+	size_t num_pds;
+};
+
+static DEFINE_MUTEX(rpmpd_lock);
+
+/* msm8996 RPM Power domains */
+DEFINE_RPMPD_CORNER_SMPA(msm8996, vddcx, vddcx_ao, 1);
+DEFINE_RPMPD_CORNER_SMPA(msm8996, vddmx, vddmx_ao, 2);
+DEFINE_RPMPD_CORNER_LDOA(msm8996, vddsscx, 26);
+
+DEFINE_RPMPD_VFC_SMPA(msm8996, vddcx_vfc, 1);
+DEFINE_RPMPD_VFC_LDOA(msm8996, vddsscx_vfc, 26);
+
+static struct rpmpd *msm8996_rpmpds[] = {
+	[MSM8996_VDDCX] =	&msm8996_vddcx,
+	[MSM8996_VDDCX_AO] =	&msm8996_vddcx_ao,
+	[MSM8996_VDDCX_VFC] =	&msm8996_vddcx_vfc,
+	[MSM8996_VDDMX] =	&msm8996_vddmx,
+	[MSM8996_VDDMX_AO] =	&msm8996_vddmx_ao,
+	[MSM8996_VDDSSCX] =	&msm8996_vddsscx,
+	[MSM8996_VDDSSCX_VFC] =	&msm8996_vddsscx_vfc,
+};
+
+static const struct rpmpd_desc msm8996_desc = {
+	.rpmpds = msm8996_rpmpds,
+	.num_pds = ARRAY_SIZE(msm8996_rpmpds),
+};
+
+static const struct of_device_id rpmpd_match_table[] = {
+	{ .compatible = "qcom,msm8996-rpmpd", .data = &msm8996_desc },
+	{ }
+};
+
+static int rpmpd_send_enable(struct rpmpd *pd, bool enable)
+{
+	struct rpmpd_req req = {
+		.key = KEY_ENABLE,
+		.nbytes = cpu_to_le32(sizeof(u32)),
+		.value = cpu_to_le32(enable),
+	};
+
+	return qcom_rpm_smd_write(pd->rpm, QCOM_SMD_RPM_ACTIVE_STATE,
+				  pd->res_type, pd->res_id, &req, sizeof(req));
+}
+
+static int rpmpd_send_corner(struct rpmpd *pd, int state, unsigned int corner)
+{
+	struct rpmpd_req req = {
+		.key = pd->key,
+		.nbytes = cpu_to_le32(sizeof(u32)),
+		.value = cpu_to_le32(corner),
+	};
+
+	return qcom_rpm_smd_write(pd->rpm, state, pd->res_type, pd->res_id,
+				  &req, sizeof(req));
+};
+
+static void to_active_sleep(struct rpmpd *pd, unsigned int corner,
+			    unsigned int *active, unsigned int *sleep)
+{
+	*active = corner;
+
+	if (pd->active_only)
+		*sleep = 0;
+	else
+		*sleep = *active;
+}
+
+static int rpmpd_aggregate_corner(struct rpmpd *pd)
+{
+	int ret;
+	struct rpmpd *peer = pd->peer;
+	unsigned int active_corner, sleep_corner;
+	unsigned int this_active_corner = 0, this_sleep_corner = 0;
+	unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
+
+	to_active_sleep(pd, pd->corner, &this_active_corner, &this_sleep_corner);
+
+	if (peer && peer->enabled)
+		to_active_sleep(peer, peer->corner, &peer_active_corner,
+				&peer_sleep_corner);
+
+	active_corner = max(this_active_corner, peer_active_corner);
+
+	ret = rpmpd_send_corner(pd, QCOM_SMD_RPM_ACTIVE_STATE, active_corner);
+	if (ret)
+		return ret;
+
+	sleep_corner = max(this_sleep_corner, peer_sleep_corner);
+
+	return rpmpd_send_corner(pd, QCOM_SMD_RPM_SLEEP_STATE, sleep_corner);
+}
+
+static int rpmpd_power_on(struct generic_pm_domain *domain)
+{
+	int ret;
+	struct rpmpd *pd = domain_to_rpmpd(domain);
+
+	mutex_lock(&rpmpd_lock);
+
+	ret = rpmpd_send_enable(pd, true);
+	if (ret)
+		goto out;
+
+	pd->enabled = true;
+
+	if (pd->corner)
+		ret = rpmpd_aggregate_corner(pd);
+
+out:
+	mutex_unlock(&rpmpd_lock);
+
+	return ret;
+}
+
+static int rpmpd_power_off(struct generic_pm_domain *domain)
+{
+	int ret;
+	struct rpmpd *pd = domain_to_rpmpd(domain);
+
+	mutex_lock(&rpmpd_lock);
+
+	ret = rpmpd_send_enable(pd, false);
+	if (!ret)
+		pd->enabled = false;
+
+	mutex_unlock(&rpmpd_lock);
+
+	return ret;
+}
+
+static int rpmpd_set_performance(struct generic_pm_domain *domain,
+				 unsigned int state)
+{
+	int ret = 0;
+	struct rpmpd *pd = domain_to_rpmpd(domain);
+
+	if (state > MAX_RPMPD_STATE)
+		goto out;
+
+	mutex_lock(&rpmpd_lock);
+
+	pd->corner = state;
+
+	if (!pd->enabled && pd->key != KEY_FLOOR_CORNER)
+		goto out;
+
+	ret = rpmpd_aggregate_corner(pd);
+
+out:
+	mutex_unlock(&rpmpd_lock);
+
+	return ret;
+}
+
+static unsigned int rpmpd_get_performance(struct generic_pm_domain *genpd,
+					  struct dev_pm_opp *opp)
+{
+	return dev_pm_opp_get_level(opp);
+}
+
+static int rpmpd_probe(struct platform_device *pdev)
+{
+	int i;
+	size_t num;
+	struct genpd_onecell_data *data;
+	struct qcom_smd_rpm *rpm;
+	struct rpmpd **rpmpds;
+	const struct rpmpd_desc *desc;
+
+	rpm = dev_get_drvdata(pdev->dev.parent);
+	if (!rpm) {
+		dev_err(&pdev->dev, "Unable to retrieve handle to RPM\n");
+		return -ENODEV;
+	}
+
+	desc = of_device_get_match_data(&pdev->dev);
+	if (!desc)
+		return -EINVAL;
+
+	rpmpds = desc->rpmpds;
+	num = desc->num_pds;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->domains = devm_kcalloc(&pdev->dev, num, sizeof(*data->domains),
+				     GFP_KERNEL);
+	data->num_domains = num;
+
+	for (i = 0; i < num; i++) {
+		if (!rpmpds[i]) {
+			dev_warn(&pdev->dev, "rpmpds[] with empty entry at index=%d\n",
+				 i);
+			continue;
+		}
+
+		rpmpds[i]->rpm = rpm;
+		rpmpds[i]->pd.power_off = rpmpd_power_off;
+		rpmpds[i]->pd.power_on = rpmpd_power_on;
+		rpmpds[i]->pd.set_performance_state = rpmpd_set_performance;
+		rpmpds[i]->pd.opp_to_performance_state = rpmpd_get_performance;
+		pm_genpd_init(&rpmpds[i]->pd, NULL, true);
+
+		data->domains[i] = &rpmpds[i]->pd;
+	}
+
+	return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
+}
+
+static struct platform_driver rpmpd_driver = {
+	.driver = {
+		.name = "qcom-rpmpd",
+		.of_match_table = rpmpd_match_table,
+		.suppress_bind_attrs = true,
+	},
+	.probe = rpmpd_probe,
+};
+
+static int __init rpmpd_init(void)
+{
+	return platform_driver_register(&rpmpd_driver);
+}
+core_initcall(rpmpd_init);