firmware: scmi: sandbox test for voltage regulator

Implement sandbox regulator devices for SCMI voltage domains
and test them in DM scmi tests.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

2 files changed, 225 insertions, 3 deletions

diff --git a/drivers/firmware/scmi/sandbox-scmi_agent.c b/drivers/firmware/scmi/sandbox-scmi_agent.c
index 97a5dace15..45a82d6cc3 100644
--- a/drivers/firmware/scmi/sandbox-scmi_agent.c
+++ b/drivers/firmware/scmi/sandbox-scmi_agent.c
@@ -21,14 +21,15 @@
  * SCMI protocols embedded in U-Boot. Currently:
  * - SCMI clock protocol: emulate 2 agents each exposing few clocks
  * - SCMI reset protocol: emulate 1 agents each exposing a reset
+ * - SCMI voltage domain protocol: emulate 1 agent exposing 2 regulators
  *
- * Agent #0 simulates 2 clocks and 1 reset domain.
+ * Agent #0 simulates 2 clocks, 1 reset domain and 1 voltage domain.
  * See IDs in scmi0_clk[]/scmi0_reset[] and "sandbox-scmi-agent@0" in test.dts.
  *
  * Agent #1 simulates 1 clock.
  * See IDs in scmi1_clk[] and "sandbox-scmi-agent@1" in test.dts.
  *
- * All clocks are default disabled and reset levels down.
+ * All clocks and regulators are default disabled and reset controller down.
  *
  * This Driver exports sandbox_scmi_service_ct() for the test sequence to
  * get the state of the simulated services (clock state, rate, ...) and
@@ -47,6 +48,11 @@ static struct sandbox_scmi_reset scmi0_reset[] = {
 	{ .id = 3 },
 };
 
+static struct sandbox_scmi_voltd scmi0_voltd[] = {
+	{ .id = 0, .voltage_uv = 3300000 },
+	{ .id = 1, .voltage_uv = 1800000 },
+};
+
 static struct sandbox_scmi_clk scmi1_clk[] = {
 	{ .id = 1, .rate = 44 },
 };
@@ -83,6 +89,13 @@ static void debug_print_agent_state(struct udevice *dev, char *str)
 		agent->reset_count,
 		agent->reset_count ? agent->reset[0].asserted : -1,
 		agent->reset_count > 1 ? agent->reset[1].asserted : -1);
+	dev_dbg(dev, " scmi%u_voltd (%zu): %u/%d, %u/%d, ...\n",
+		agent->idx,
+		agent->voltd_count,
+		agent->voltd_count ? agent->voltd[0].enabled : -1,
+		agent->voltd_count ? agent->voltd[0].voltage_uv : -1,
+		agent->voltd_count ? agent->voltd[1].enabled : -1,
+		agent->voltd_count ? agent->voltd[1].voltage_uv : -1);
 };
 
 static struct sandbox_scmi_clk *get_scmi_clk_state(uint agent_id, uint clock_id)
@@ -125,6 +138,20 @@ static struct sandbox_scmi_reset *get_scmi_reset_state(uint agent_id,
 	return NULL;
 }
 
+static struct sandbox_scmi_voltd *get_scmi_voltd_state(uint agent_id,
+						       uint domain_id)
+{
+	size_t n;
+
+	if (agent_id == 0) {
+		for (n = 0; n < ARRAY_SIZE(scmi0_voltd); n++)
+			if (scmi0_voltd[n].id == domain_id)
+				return scmi0_voltd + n;
+	}
+
+	return NULL;
+}
+
 /*
  * Sandbox SCMI agent ops
  */
@@ -292,6 +319,160 @@ static int sandbox_scmi_rd_reset(struct udevice *dev, struct scmi_msg *msg)
 	return 0;
 }
 
+static int sandbox_scmi_voltd_attribs(struct udevice *dev, struct scmi_msg *msg)
+{
+	struct sandbox_scmi_agent *agent = dev_get_priv(dev);
+	struct scmi_voltd_attr_in *in = NULL;
+	struct scmi_voltd_attr_out *out = NULL;
+	struct sandbox_scmi_voltd *voltd_state = NULL;
+
+	if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
+	    !msg->out_msg || msg->out_msg_sz < sizeof(*out))
+		return -EINVAL;
+
+	in = (struct scmi_voltd_attr_in *)msg->in_msg;
+	out = (struct scmi_voltd_attr_out *)msg->out_msg;
+
+	voltd_state = get_scmi_voltd_state(agent->idx, in->domain_id);
+	if (!voltd_state) {
+		dev_err(dev, "Unexpected domain ID %u\n", in->domain_id);
+
+		out->status = SCMI_NOT_FOUND;
+	} else {
+		memset(out, 0, sizeof(*out));
+		snprintf(out->name, sizeof(out->name), "regu%u", in->domain_id);
+
+		out->status = SCMI_SUCCESS;
+	}
+
+	return 0;
+}
+
+static int sandbox_scmi_voltd_config_set(struct udevice *dev,
+					 struct scmi_msg *msg)
+{
+	struct sandbox_scmi_agent *agent = dev_get_priv(dev);
+	struct scmi_voltd_config_set_in *in = NULL;
+	struct scmi_voltd_config_set_out *out = NULL;
+	struct sandbox_scmi_voltd *voltd_state = NULL;
+
+	if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
+	    !msg->out_msg || msg->out_msg_sz < sizeof(*out))
+		return -EINVAL;
+
+	in = (struct scmi_voltd_config_set_in *)msg->in_msg;
+	out = (struct scmi_voltd_config_set_out *)msg->out_msg;
+
+	voltd_state = get_scmi_voltd_state(agent->idx, in->domain_id);
+	if (!voltd_state) {
+		dev_err(dev, "Unexpected domain ID %u\n", in->domain_id);
+
+		out->status = SCMI_NOT_FOUND;
+	} else if (in->config & ~SCMI_VOLTD_CONFIG_MASK) {
+		dev_err(dev, "Invalid config value 0x%x\n", in->config);
+
+		out->status = SCMI_INVALID_PARAMETERS;
+	} else if (in->config != SCMI_VOLTD_CONFIG_ON &&
+		   in->config != SCMI_VOLTD_CONFIG_OFF) {
+		dev_err(dev, "Unexpected custom value 0x%x\n", in->config);
+
+		out->status = SCMI_INVALID_PARAMETERS;
+	} else {
+		voltd_state->enabled = in->config == SCMI_VOLTD_CONFIG_ON;
+		out->status = SCMI_SUCCESS;
+	}
+
+	return 0;
+}
+
+static int sandbox_scmi_voltd_config_get(struct udevice *dev,
+					 struct scmi_msg *msg)
+{
+	struct sandbox_scmi_agent *agent = dev_get_priv(dev);
+	struct scmi_voltd_config_get_in *in = NULL;
+	struct scmi_voltd_config_get_out *out = NULL;
+	struct sandbox_scmi_voltd *voltd_state = NULL;
+
+	if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
+	    !msg->out_msg || msg->out_msg_sz < sizeof(*out))
+		return -EINVAL;
+
+	in = (struct scmi_voltd_config_get_in *)msg->in_msg;
+	out = (struct scmi_voltd_config_get_out *)msg->out_msg;
+
+	voltd_state = get_scmi_voltd_state(agent->idx, in->domain_id);
+	if (!voltd_state) {
+		dev_err(dev, "Unexpected domain ID %u\n", in->domain_id);
+
+		out->status = SCMI_NOT_FOUND;
+	} else {
+		if (voltd_state->enabled)
+			out->config = SCMI_VOLTD_CONFIG_ON;
+		else
+			out->config = SCMI_VOLTD_CONFIG_OFF;
+
+		out->status = SCMI_SUCCESS;
+	}
+
+	return 0;
+}
+
+static int sandbox_scmi_voltd_level_set(struct udevice *dev,
+					 struct scmi_msg *msg)
+{
+	struct sandbox_scmi_agent *agent = dev_get_priv(dev);
+	struct scmi_voltd_level_set_in *in = NULL;
+	struct scmi_voltd_level_set_out *out = NULL;
+	struct sandbox_scmi_voltd *voltd_state = NULL;
+
+	if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
+	    !msg->out_msg || msg->out_msg_sz < sizeof(*out))
+		return -EINVAL;
+
+	in = (struct scmi_voltd_level_set_in *)msg->in_msg;
+	out = (struct scmi_voltd_level_set_out *)msg->out_msg;
+
+	voltd_state = get_scmi_voltd_state(agent->idx, in->domain_id);
+	if (!voltd_state) {
+		dev_err(dev, "Unexpected domain ID %u\n", in->domain_id);
+
+		out->status = SCMI_NOT_FOUND;
+	} else {
+		voltd_state->voltage_uv = in->voltage_level;
+		out->status = SCMI_SUCCESS;
+	}
+
+	return 0;
+}
+
+static int sandbox_scmi_voltd_level_get(struct udevice *dev,
+					struct scmi_msg *msg)
+{
+	struct sandbox_scmi_agent *agent = dev_get_priv(dev);
+	struct scmi_voltd_level_get_in *in = NULL;
+	struct scmi_voltd_level_get_out *out = NULL;
+	struct sandbox_scmi_voltd *voltd_state = NULL;
+
+	if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
+	    !msg->out_msg || msg->out_msg_sz < sizeof(*out))
+		return -EINVAL;
+
+	in = (struct scmi_voltd_level_get_in *)msg->in_msg;
+	out = (struct scmi_voltd_level_get_out *)msg->out_msg;
+
+	voltd_state = get_scmi_voltd_state(agent->idx, in->domain_id);
+	if (!voltd_state) {
+		dev_err(dev, "Unexpected domain ID %u\n", in->domain_id);
+
+		out->status = SCMI_NOT_FOUND;
+	} else {
+		out->voltage_level = voltd_state->voltage_uv;
+		out->status = SCMI_SUCCESS;
+	}
+
+	return 0;
+}
+
 static int sandbox_scmi_test_process_msg(struct udevice *dev,
 					 struct scmi_msg *msg)
 {
@@ -318,6 +499,22 @@ static int sandbox_scmi_test_process_msg(struct udevice *dev,
 			break;
 		}
 		break;
+	case SCMI_PROTOCOL_ID_VOLTAGE_DOMAIN:
+		switch (msg->message_id) {
+		case SCMI_VOLTAGE_DOMAIN_ATTRIBUTES:
+			return sandbox_scmi_voltd_attribs(dev, msg);
+		case SCMI_VOLTAGE_DOMAIN_CONFIG_SET:
+			return sandbox_scmi_voltd_config_set(dev, msg);
+		case SCMI_VOLTAGE_DOMAIN_CONFIG_GET:
+			return sandbox_scmi_voltd_config_get(dev, msg);
+		case SCMI_VOLTAGE_DOMAIN_LEVEL_SET:
+			return sandbox_scmi_voltd_level_set(dev, msg);
+		case SCMI_VOLTAGE_DOMAIN_LEVEL_GET:
+			return sandbox_scmi_voltd_level_get(dev, msg);
+		default:
+			break;
+		}
+		break;
 	case SCMI_PROTOCOL_ID_BASE:
 	case SCMI_PROTOCOL_ID_POWER_DOMAIN:
 	case SCMI_PROTOCOL_ID_SYSTEM:
@@ -369,6 +566,8 @@ static int sandbox_scmi_test_probe(struct udevice *dev)
 			.clk_count = ARRAY_SIZE(scmi0_clk),
 			.reset = scmi0_reset,
 			.reset_count = ARRAY_SIZE(scmi0_reset),
+			.voltd = scmi0_voltd,
+			.voltd_count = ARRAY_SIZE(scmi0_voltd),
 		};
 		break;
 	case '1':
diff --git a/drivers/firmware/scmi/sandbox-scmi_devices.c b/drivers/firmware/scmi/sandbox-scmi_devices.c
index 69239a198f..66a6792881 100644
--- a/drivers/firmware/scmi/sandbox-scmi_devices.c
+++ b/drivers/firmware/scmi/sandbox-scmi_devices.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Copyright (C) 2020, Linaro Limited
+ * Copyright (C) 2020-2021, Linaro Limited
  */
 
 #define LOG_CATEGORY UCLASS_MISC
@@ -8,11 +8,13 @@
 #include <common.h>
 #include <clk.h>
 #include <dm.h>
+#include <log.h>
 #include <malloc.h>
 #include <reset.h>
 #include <asm/io.h>
 #include <asm/scmi_test.h>
 #include <dm/device_compat.h>
+#include <power/regulator.h>
 
 /*
  * Simulate to some extent a SCMI exchange.
@@ -23,16 +25,19 @@
 
 #define SCMI_TEST_DEVICES_CLK_COUNT		3
 #define SCMI_TEST_DEVICES_RD_COUNT		1
+#define SCMI_TEST_DEVICES_VOLTD_COUNT		2
 
 /*
  * struct sandbox_scmi_device_priv - Storage for device handles used by test
  * @clk:		Array of clock instances used by tests
  * @reset_clt:		Array of the reset controller instances used by tests
+ * @regulators:		Array of regulator device references used by the tests
  * @devices:		Resources exposed by sandbox_scmi_devices_ctx()
  */
 struct sandbox_scmi_device_priv {
 	struct clk clk[SCMI_TEST_DEVICES_CLK_COUNT];
 	struct reset_ctl reset_ctl[SCMI_TEST_DEVICES_RD_COUNT];
+	struct udevice *regulators[SCMI_TEST_DEVICES_VOLTD_COUNT];
 	struct sandbox_scmi_devices devices;
 };
 
@@ -76,6 +81,8 @@ static int sandbox_scmi_devices_probe(struct udevice *dev)
 		.clk_count = SCMI_TEST_DEVICES_CLK_COUNT,
 		.reset = priv->reset_ctl,
 		.reset_count = SCMI_TEST_DEVICES_RD_COUNT,
+		.regul = priv->regulators,
+		.regul_count = SCMI_TEST_DEVICES_VOLTD_COUNT,
 	};
 
 	for (n = 0; n < SCMI_TEST_DEVICES_CLK_COUNT; n++) {
@@ -94,8 +101,24 @@ static int sandbox_scmi_devices_probe(struct udevice *dev)
 		}
 	}
 
+	for (n = 0; n < SCMI_TEST_DEVICES_VOLTD_COUNT; n++) {
+		char name[32];
+
+		ret = snprintf(name, sizeof(name), "regul%zu-supply", n);
+		assert(ret >= 0 && ret < sizeof(name));
+
+		ret = device_get_supply_regulator(dev, name,
+						  priv->devices.regul + n);
+		if (ret) {
+			dev_err(dev, "%s: Failed on voltd %zu\n", __func__, n);
+			goto err_regul;
+		}
+	}
+
 	return 0;
 
+err_regul:
+	n = SCMI_TEST_DEVICES_RD_COUNT;
 err_reset:
 	for (; n > 0; n--)
 		reset_free(priv->devices.reset + n - 1);