1 files changed, 406 insertions, 0 deletions
diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c
new file mode 100644
index 000000000000..5741ec3fa814
--- /dev/null
+++ b/drivers/soc/qcom/rpmhpd.c
@@ -0,0 +1,406 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 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/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <soc/qcom/cmd-db.h>
+#include <soc/qcom/rpmh.h>
+#include <dt-bindings/power/qcom-rpmpd.h>
+
+#define domain_to_rpmhpd(domain) container_of(domain, struct rpmhpd, pd)
+
+#define RPMH_ARC_MAX_LEVELS	16
+
+/**
+ * struct rpmhpd - top level RPMh power domain resource data structure
+ * @dev:		rpmh power domain controller device
+ * @pd:			generic_pm_domain corrresponding to the power domain
+ * @peer:		A peer power domain in case Active only Voting is
+ *			supported
+ * @active_only:	True if it represents an Active only peer
+ * @level:		An array of level (vlvl) to corner (hlvl) mappings
+ *			derived from cmd-db
+ * @level_count:	Number of levels supported by the power domain. max
+ *			being 16 (0 - 15)
+ * @enabled:		true if the power domain is enabled
+ * @res_name:		Resource name used for cmd-db lookup
+ * @addr:		Resource address as looped up using resource name from
+ *			cmd-db
+ */
+struct rpmhpd {
+	struct device	*dev;
+	struct generic_pm_domain pd;
+	struct generic_pm_domain *parent;
+	struct rpmhpd	*peer;
+	const bool	active_only;
+	unsigned int	corner;
+	unsigned int	active_corner;
+	u32		level[RPMH_ARC_MAX_LEVELS];
+	size_t		level_count;
+	bool		enabled;
+	const char	*res_name;
+	u32		addr;
+};
+
+struct rpmhpd_desc {
+	struct rpmhpd **rpmhpds;
+	size_t num_pds;
+};
+
+static DEFINE_MUTEX(rpmhpd_lock);
+
+/* SDM845 RPMH powerdomains */
+
+static struct rpmhpd sdm845_ebi = {
+	.pd = { .name = "ebi", },
+	.res_name = "ebi.lvl",
+};
+
+static struct rpmhpd sdm845_lmx = {
+	.pd = { .name = "lmx", },
+	.res_name = "lmx.lvl",
+};
+
+static struct rpmhpd sdm845_lcx = {
+	.pd = { .name = "lcx", },
+	.res_name = "lcx.lvl",
+};
+
+static struct rpmhpd sdm845_gfx = {
+	.pd = { .name = "gfx", },
+	.res_name = "gfx.lvl",
+};
+
+static struct rpmhpd sdm845_mss = {
+	.pd = { .name = "mss", },
+	.res_name = "mss.lvl",
+};
+
+static struct rpmhpd sdm845_mx_ao;
+static struct rpmhpd sdm845_mx = {
+	.pd = { .name = "mx", },
+	.peer = &sdm845_mx_ao,
+	.res_name = "mx.lvl",
+};
+
+static struct rpmhpd sdm845_mx_ao = {
+	.pd = { .name = "mx_ao", },
+	.peer = &sdm845_mx,
+	.res_name = "mx.lvl",
+};
+
+static struct rpmhpd sdm845_cx_ao;
+static struct rpmhpd sdm845_cx = {
+	.pd = { .name = "cx", },
+	.peer = &sdm845_cx_ao,
+	.parent = &sdm845_mx.pd,
+	.res_name = "cx.lvl",
+};
+
+static struct rpmhpd sdm845_cx_ao = {
+	.pd = { .name = "cx_ao", },
+	.peer = &sdm845_cx,
+	.parent = &sdm845_mx_ao.pd,
+	.res_name = "cx.lvl",
+};
+
+static struct rpmhpd *sdm845_rpmhpds[] = {
+	[SDM845_EBI] = &sdm845_ebi,
+	[SDM845_MX] = &sdm845_mx,
+	[SDM845_MX_AO] = &sdm845_mx_ao,
+	[SDM845_CX] = &sdm845_cx,
+	[SDM845_CX_AO] = &sdm845_cx_ao,
+	[SDM845_LMX] = &sdm845_lmx,
+	[SDM845_LCX] = &sdm845_lcx,
+	[SDM845_GFX] = &sdm845_gfx,
+	[SDM845_MSS] = &sdm845_mss,
+};
+
+static const struct rpmhpd_desc sdm845_desc = {
+	.rpmhpds = sdm845_rpmhpds,
+	.num_pds = ARRAY_SIZE(sdm845_rpmhpds),
+};
+
+static const struct of_device_id rpmhpd_match_table[] = {
+	{ .compatible = "qcom,sdm845-rpmhpd", .data = &sdm845_desc },
+	{ }
+};
+
+static int rpmhpd_send_corner(struct rpmhpd *pd, int state,
+			      unsigned int corner, bool sync)
+{
+	struct tcs_cmd cmd = {
+		.addr = pd->addr,
+		.data = corner,
+	};
+
+	/*
+	 * Wait for an ack only when we are increasing the
+	 * perf state of the power domain
+	 */
+	if (sync)
+		return rpmh_write(pd->dev, state, &cmd, 1);
+	else
+		return rpmh_write_async(pd->dev, state, &cmd, 1);
+}
+
+static void to_active_sleep(struct rpmhpd *pd, unsigned int corner,
+			    unsigned int *active, unsigned int *sleep)
+{
+	*active = corner;
+
+	if (pd->active_only)
+		*sleep = 0;
+	else
+		*sleep = *active;
+}
+
+/*
+ * This function is used to aggregate the votes across the active only
+ * resources and its peers. The aggregated votes are sent to RPMh as
+ * ACTIVE_ONLY votes (which take effect immediately), as WAKE_ONLY votes
+ * (applied by RPMh on system wakeup) and as SLEEP votes (applied by RPMh
+ * on system sleep).
+ * We send ACTIVE_ONLY votes for resources without any peers. For others,
+ * which have an active only peer, all 3 votes are sent.
+ */
+static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner)
+{
+	int ret;
+	struct rpmhpd *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, 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 = rpmhpd_send_corner(pd, RPMH_ACTIVE_ONLY_STATE, active_corner,
+				 active_corner > pd->active_corner);
+	if (ret)
+		return ret;
+
+	pd->active_corner = active_corner;
+
+	if (peer) {
+		peer->active_corner = active_corner;
+
+		ret = rpmhpd_send_corner(pd, RPMH_WAKE_ONLY_STATE,
+					 active_corner, false);
+		if (ret)
+			return ret;
+
+		sleep_corner = max(this_sleep_corner, peer_sleep_corner);
+
+		return rpmhpd_send_corner(pd, RPMH_SLEEP_STATE, sleep_corner,
+					  false);
+	}
+
+	return ret;
+}
+
+static int rpmhpd_power_on(struct generic_pm_domain *domain)
+{
+	struct rpmhpd *pd = domain_to_rpmhpd(domain);
+	int ret = 0;
+
+	mutex_lock(&rpmhpd_lock);
+
+	if (pd->corner)
+		ret = rpmhpd_aggregate_corner(pd, pd->corner);
+
+	if (!ret)
+		pd->enabled = true;
+
+	mutex_unlock(&rpmhpd_lock);
+
+	return ret;
+}
+
+static int rpmhpd_power_off(struct generic_pm_domain *domain)
+{
+	struct rpmhpd *pd = domain_to_rpmhpd(domain);
+	int ret = 0;
+
+	mutex_lock(&rpmhpd_lock);
+
+	ret = rpmhpd_aggregate_corner(pd, pd->level[0]);
+
+	if (!ret)
+		pd->enabled = false;
+
+	mutex_unlock(&rpmhpd_lock);
+
+	return ret;
+}
+
+static int rpmhpd_set_performance_state(struct generic_pm_domain *domain,
+					unsigned int level)
+{
+	struct rpmhpd *pd = domain_to_rpmhpd(domain);
+	int ret = 0, i;
+
+	mutex_lock(&rpmhpd_lock);
+
+	for (i = 0; i < pd->level_count; i++)
+		if (level <= pd->level[i])
+			break;
+
+	/*
+	 * If the level requested is more than that supported by the
+	 * max corner, just set it to max anyway.
+	 */
+	if (i == pd->level_count)
+		i--;
+
+	if (pd->enabled) {
+		ret = rpmhpd_aggregate_corner(pd, i);
+		if (ret)
+			goto out;
+	}
+
+	pd->corner = i;
+out:
+	mutex_unlock(&rpmhpd_lock);
+
+	return ret;
+}
+
+static unsigned int rpmhpd_get_performance_state(struct generic_pm_domain *genpd,
+						 struct dev_pm_opp *opp)
+{
+	return dev_pm_opp_get_level(opp);
+}
+
+static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
+{
+	int i;
+	const u16 *buf;
+
+	buf = cmd_db_read_aux_data(rpmhpd->res_name, &rpmhpd->level_count);
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
+
+	/* 2 bytes used for each command DB aux data entry */
+	rpmhpd->level_count >>= 1;
+
+	if (rpmhpd->level_count > RPMH_ARC_MAX_LEVELS)
+		return -EINVAL;
+
+	for (i = 0; i < rpmhpd->level_count; i++) {
+		rpmhpd->level[i] = buf[i];
+
+		/*
+		 * The AUX data may be zero padded.  These 0 valued entries at
+		 * the end of the map must be ignored.
+		 */
+		if (i > 0 && rpmhpd->level[i] == 0) {
+			rpmhpd->level_count = i;
+			break;
+		}
+		pr_debug("%s: ARC hlvl=%2d --> vlvl=%4u\n", rpmhpd->res_name, i,
+			 rpmhpd->level[i]);
+	}
+
+	return 0;
+}
+
+static int rpmhpd_probe(struct platform_device *pdev)
+{
+	int i, ret;
+	size_t num_pds;
+	struct device *dev = &pdev->dev;
+	struct genpd_onecell_data *data;
+	struct rpmhpd **rpmhpds;
+	const struct rpmhpd_desc *desc;
+
+	desc = of_device_get_match_data(dev);
+	if (!desc)
+		return -EINVAL;
+
+	rpmhpds = desc->rpmhpds;
+	num_pds = desc->num_pds;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->domains = devm_kcalloc(dev, num_pds, sizeof(*data->domains),
+				     GFP_KERNEL);
+	if (!data->domains)
+		return -ENOMEM;
+
+	data->num_domains = num_pds;
+
+	for (i = 0; i < num_pds; i++) {
+		if (!rpmhpds[i]) {
+			dev_warn(dev, "rpmhpds[%d] is empty\n", i);
+			continue;
+		}
+
+		rpmhpds[i]->dev = dev;
+		rpmhpds[i]->addr = cmd_db_read_addr(rpmhpds[i]->res_name);
+		if (!rpmhpds[i]->addr) {
+			dev_err(dev, "Could not find RPMh address for resource %s\n",
+				rpmhpds[i]->res_name);
+			return -ENODEV;
+		}
+
+		ret = cmd_db_read_slave_id(rpmhpds[i]->res_name);
+		if (ret != CMD_DB_HW_ARC) {
+			dev_err(dev, "RPMh slave ID mismatch\n");
+			return -EINVAL;
+		}
+
+		ret = rpmhpd_update_level_mapping(rpmhpds[i]);
+		if (ret)
+			return ret;
+
+		rpmhpds[i]->pd.power_off = rpmhpd_power_off;
+		rpmhpds[i]->pd.power_on = rpmhpd_power_on;
+		rpmhpds[i]->pd.set_performance_state = rpmhpd_set_performance_state;
+		rpmhpds[i]->pd.opp_to_performance_state = rpmhpd_get_performance_state;
+		pm_genpd_init(&rpmhpds[i]->pd, NULL, true);
+
+		data->domains[i] = &rpmhpds[i]->pd;
+	}
+
+	/* Add subdomains */
+	for (i = 0; i < num_pds; i++) {
+		if (!rpmhpds[i])
+			continue;
+		if (rpmhpds[i]->parent)
+			pm_genpd_add_subdomain(rpmhpds[i]->parent,
+					       &rpmhpds[i]->pd);
+	}
+
+	return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
+}
+
+static struct platform_driver rpmhpd_driver = {
+	.driver = {
+		.name = "qcom-rpmhpd",
+		.of_match_table = rpmhpd_match_table,
+		.suppress_bind_attrs = true,
+	},
+	.probe = rpmhpd_probe,
+};
+
+static int __init rpmhpd_init(void)
+{
+	return platform_driver_register(&rpmhpd_driver);
+}
+core_initcall(rpmhpd_init);