[sival, pwm] Adds smoketest

Signed-off-by: Douglas Reis <[email protected]>

sw/device/tests/BUILD

@@ -2842,6 +2842,45 @@ opentitan_test(
     ],
 )
 
+opentitan_test(
+    name = "pwm_smoketest",
+    srcs = ["pwm_smoketest.c"],
+    exec_env = dicts.add(
+        EARLGREY_TEST_ENVS,
+        EARLGREY_SILICON_OWNER_ROM_EXT_ENVS,
+        {
+            "//hw/top_earlgrey:silicon_owner_sival_rom_ext": None,
+            "//hw/top_earlgrey:fpga_cw310_sival": None,
+        },
+    ),
+    fpga = fpga_params(
+        test_cmd = """
+            --bootstrap="{firmware}"
+            "{firmware:elf}"
+        """,
+        test_harness = "//sw/host/tests/chip/pwm_smoketest",
+    ),
+    silicon = silicon_params(
+        test_cmd = """
+            --bootstrap="{firmware}"
+            "{firmware:elf}"
+        """,
+        test_harness = "//sw/host/tests/chip/pwm_smoketest",
+    ),
+    deps = [
+        "//hw/top_earlgrey/sw/autogen:top_earlgrey",
+        "//sw/device/lib/dif:gpio",
+        "//sw/device/lib/dif:pinmux",
+        "//sw/device/lib/dif:pwm",
+        "//sw/device/lib/runtime:hart",
+        "//sw/device/lib/runtime:ibex",
+        "//sw/device/lib/runtime:irq",
+        "//sw/device/lib/runtime:log",
+        "//sw/device/lib/testing/test_framework:ottf_main",
+        "//sw/device/lib/testing/test_framework:ottf_utils",
+    ],
+)
+
 cc_library(
     name = "pwrmgr_sleep_resets_lib",
     srcs = ["pwrmgr_sleep_resets_lib.c"],

sw/device/tests/pwm_smoketest.c

@@ -0,0 +1,99 @@
+// Copyright lowRISC contributors (OpenTitan project).
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#include <stdint.h>
+
+#include "sw/device/lib/base/mmio.h"
+#include "sw/device/lib/dif/dif_gpio.h"
+#include "sw/device/lib/dif/dif_pinmux.h"
+#include "sw/device/lib/dif/dif_pwm.h"
+#include "sw/device/lib/runtime/hart.h"
+#include "sw/device/lib/runtime/log.h"
+#include "sw/device/lib/testing/test_framework/check.h"
+#include "sw/device/lib/testing/test_framework/ottf_main.h"
+#include "sw/device/lib/testing/test_framework/ottf_utils.h"
+
+#include "hw/top_earlgrey/sw/autogen/top_earlgrey.h"
+
+OTTF_DEFINE_TEST_CONFIG();
+
+static volatile const uint8_t kClocksHz[] = {24, 48, 96};
+static volatile const uint8_t kDutyCycles[] = {11, 36, 50, 71, 91};
+
+static dif_pwm_config_t compute_clk_config(uint32_t pwm_clk) {
+  enum {
+    kDutyCycleResolution = 5,
+    kBeatsPerCycle = 1 << (kDutyCycleResolution + 1),  // 2 ^ (DC_RESN + 1)
+  };
+  return (dif_pwm_config_t){
+      .beats_per_pulse_cycle = kBeatsPerCycle,
+      .clock_divisor =
+          ((uint32_t)kClockFreqAonHz / (kBeatsPerCycle * pwm_clk)) - 1};
+}
+
+bool test_main(void) {
+  dif_pwm_t pwm;
+  mmio_region_t addr = mmio_region_from_addr(TOP_EARLGREY_PWM_AON_BASE_ADDR);
+  CHECK_DIF_OK(dif_pwm_init(addr, &pwm));
+
+  dif_pinmux_t pinmux;
+  addr = mmio_region_from_addr(TOP_EARLGREY_PINMUX_AON_BASE_ADDR);
+  CHECK_DIF_OK(dif_pinmux_init(addr, &pinmux));
+  CHECK_DIF_OK(dif_pinmux_output_select(&pinmux, kTopEarlgreyPinmuxMioOutIoa8,
+                                        kTopEarlgreyPinmuxOutselPwmAonPwm0));
+
+  dif_gpio_t gpio;
+  addr = mmio_region_from_addr(TOP_EARLGREY_GPIO_BASE_ADDR);
+  CHECK_DIF_OK(dif_gpio_init(addr, &gpio));
+  CHECK_DIF_OK(dif_gpio_output_set_enabled_all(&gpio, 0x1));
+
+  // The host uses IOA7 to let the device know when the sampling started.
+  CHECK_DIF_OK(dif_pinmux_input_select(&pinmux,
+                                       kTopEarlgreyPinmuxPeripheralInGpioGpio0,
+                                       kTopEarlgreyPinmuxInselIoa7));
+
+  for (size_t i = 0; i < ARRAYSIZE(kClocksHz); ++i) {
+    dif_pwm_config_t pwm_config = compute_clk_config(kClocksHz[i]);
+    for (size_t j = 0; j < ARRAYSIZE(kDutyCycles); ++j) {
+      dif_pwm_channel_config_t channel_config = {
+          .duty_cycle_a = (uint16_t)(pwm_config.beats_per_pulse_cycle *
+                                     kDutyCycles[j] / 100),
+          .duty_cycle_b = 0,
+          .phase_delay = 0,
+          .mode = kDifPwmModeFirmware,
+          .polarity = kDifPwmPolarityActiveHigh,
+          .blink_parameter_x = 0,
+          .blink_parameter_y = 0,
+      };
+
+      CHECK_DIF_OK(dif_pwm_configure(&pwm, pwm_config));
+      CHECK_DIF_OK(
+          dif_pwm_configure_channel(&pwm, kDifPwmChannel0, channel_config));
+
+      // The IOA7 goes low when the host is sampling.
+      bool not_sampling = true;
+      do {
+        CHECK_DIF_OK(dif_gpio_read(&gpio, 0, &not_sampling));
+        if (!not_sampling) {  // Debounce
+          busy_spin_micros(50);
+          CHECK_DIF_OK(dif_gpio_read(&gpio, 0, &not_sampling));
+        }
+      } while (not_sampling);
+
+      CHECK_DIF_OK(dif_pwm_phase_cntr_set_enabled(&pwm, kDifToggleEnabled));
+      CHECK_DIF_OK(dif_pwm_channel_set_enabled(&pwm, kDifPwmChannel0,
+                                               kDifToggleEnabled));
+
+      // The goes high when the host stop sampling.
+      do {
+        CHECK_DIF_OK(dif_gpio_read(&gpio, 0, &not_sampling));
+      } while (!not_sampling);
+
+      CHECK_DIF_OK(dif_pwm_channel_set_enabled(&pwm, kDifPwmChannel0,
+                                               kDifToggleDisabled));
+      CHECK_DIF_OK(dif_pwm_phase_cntr_set_enabled(&pwm, kDifToggleDisabled));
+    }
+  }
+  return true;
+}