new file mode 100644
@@ -0,0 +1,14 @@
+Qualcomm RPM Powerdomains
+
+* For RPM powerdomains, we communicate a performance state to RPM
+which then translates it into a corresponding voltage on a rail
+
+Required Properties:
+ - compatible: Should be one of the following
+ * qcom,rpmpd-msm8996: RPM Powerdomain for the msm8996 family of SoC
+ - power-domain-cells: number of cells in power domain specifier
+ must be 1.
+ - domain-performance-state: One or more nodes describing the performance-states
+ supported by the powerdomain.
+ For domain-performance-state bindings refer to
+ Documentation/devicetree/bindings/power/power_domain.txt
@@ -55,6 +55,15 @@ config QCOM_RMTFS_MEM
Say y here if you intend to boot the modem remoteproc.
+config QCOM_RPMPD
+ tristate "Qualcomm RPM Powerdomain driver"
+ depends on MFD_QCOM_RPM && QCOM_SMD_RPM
+ help
+ QCOM RPM powerdomain driver to support powerdomain with
+ performance states. The driver communicates a performance state
+ value to RPM which then translates it into corresponding voltage
+ for the voltage rail.
+
config QCOM_SMEM
tristate "Qualcomm Shared Memory Manager (SMEM)"
depends on ARCH_QCOM
@@ -12,3 +12,4 @@ obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
obj-$(CONFIG_QCOM_SMP2P) += smp2p.o
obj-$(CONFIG_QCOM_SMSM) += smsm.o
obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o
+obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o
new file mode 100644
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pm_domain.h>
+#include <linux/mfd/qcom_rpm.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/soc/qcom/smd-rpm.h>
+
+#include <dt-bindings/mfd/qcom-rpm.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 DEFINE_RPMPD_CORN_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_CORN_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 long 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 powerdomains */
+DEFINE_RPMPD_CORN_SMPA(msm8996, vddcx, vddcx_ao, 1);
+DEFINE_RPMPD_CORN_SMPA(msm8996, vddmx, vddmx_ao, 2);
+DEFINE_RPMPD_CORN_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[] = {
+ [0] = &msm8996_vddcx,
+ [1] = &msm8996_vddcx_ao,
+ [2] = &msm8996_vddcx_vfc,
+ [3] = &msm8996_vddmx,
+ [4] = &msm8996_vddmx_ao,
+ [5] = &msm8996_vddsscx,
+ [6] = &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,rpmpd-msm8996", .data = &msm8996_desc },
+ { }
+};
+MODULE_DEVICE_TABLE(of, rpmpd_match_table);
+
+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_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 long corner,
+ unsigned long *active, unsigned long *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 long active_corner, sleep_corner;
+ unsigned long this_corner = 0, this_sleep_corner = 0;
+ unsigned long peer_corner = 0, peer_sleep_corner = 0;
+
+ to_active_sleep(pd, pd->corner, &this_corner, &this_sleep_corner);
+
+ if (peer && peer->enabled)
+ to_active_sleep(peer, peer->corner, &peer_corner,
+ &peer_sleep_corner);
+
+ active_corner = max(this_corner, peer_corner);
+
+ ret = rpmpd_send_corner(pd, QCOM_RPM_ACTIVE_STATE, active_corner);
+ if (ret)
+ return ret;
+
+ sleep_corner = max(this_sleep_corner, peer_sleep_corner);
+
+ return rpmpd_send_corner(pd, QCOM_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_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])
+ continue;
+
+ rpmpds[i]->rpm = rpm;
+ rpmpds[i]->pd.power_off = rpmpd_power_off;
+ rpmpds[i]->pd.power_on = rpmpd_power_on;
+ 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 int rpmpd_remove(struct platform_device *pdev)
+{
+ of_genpd_del_provider(pdev->dev.of_node);
+ return 0;
+}
+
+static struct platform_driver rpmpd_driver = {
+ .driver = {
+ .name = "qcom-rpmpd",
+ .of_match_table = rpmpd_match_table,
+ },
+ .probe = rpmpd_probe,
+ .remove = rpmpd_remove,
+};
+
+static int __init rpmpd_init(void)
+{
+ return platform_driver_register(&rpmpd_driver);
+}
+core_initcall(rpmpd_init);
+
+static void __exit rpmpd_exit(void)
+{
+ platform_driver_unregister(&rpmpd_driver);
+}
+module_exit(rpmpd_exit);
+
+MODULE_DESCRIPTION("Qualcomm RPM Power Domain Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:qcom-rpmpd");