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-rw-r--r--src/acpi/Makefile.inc1
-rw-r--r--src/acpi/acpigen_dptf.c166
2 files changed, 167 insertions, 0 deletions
diff --git a/src/acpi/Makefile.inc b/src/acpi/Makefile.inc
index 29ddc08d96..f70b23ff5b 100644
--- a/src/acpi/Makefile.inc
+++ b/src/acpi/Makefile.inc
@@ -4,6 +4,7 @@ ifeq ($(CONFIG_HAVE_ACPI_TABLES),y)
ramstage-y += acpi.c
ramstage-y += acpigen.c
+ramstage-y += acpigen_dptf.c
ramstage-y += acpigen_dsm.c
ramstage-y += acpigen_ps2_keybd.c
ramstage-y += acpigen_usb.c
diff --git a/src/acpi/acpigen_dptf.c b/src/acpi/acpigen_dptf.c
new file mode 100644
index 0000000000..74e91910bb
--- /dev/null
+++ b/src/acpi/acpigen_dptf.c
@@ -0,0 +1,166 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpigen.h>
+#include <acpi/acpigen_dptf.h>
+
+/* Hardcoded paths */
+#define TOPLEVEL_DPTF_SCOPE "\\_SB.DPTF"
+
+/* Defaults */
+enum {
+ ART_REVISION = 0,
+ DEFAULT_WEIGHT = 100,
+ DPTF_MAX_ART_THRESHOLDS = 10,
+};
+
+/* Convert degrees C to 1/10 degree Kelvin for ACPI */
+static int to_acpi_temp(int deg_c)
+{
+ return deg_c * 10 + 2732;
+}
+
+/* Writes out a 0-argument non-Serialized Method that returns an Integer */
+static void write_simple_return_method(const char *name, int value)
+{
+ acpigen_write_method(name, 0);
+ acpigen_write_return_integer(value);
+ acpigen_pop_len(); /* Method */
+}
+
+/* Return the assigned namestring of any participant */
+static const char *namestring_of(enum dptf_participant participant)
+{
+ switch (participant) {
+ case DPTF_CPU:
+ return "TCPU";
+ case DPTF_CHARGER:
+ return "TCHG";
+ case DPTF_FAN:
+ return "TFN1";
+ case DPTF_TEMP_SENSOR_0:
+ return "TSR0";
+ case DPTF_TEMP_SENSOR_1:
+ return "TSR1";
+ case DPTF_TEMP_SENSOR_2:
+ return "TSR2";
+ case DPTF_TEMP_SENSOR_3:
+ return "TSR3";
+ default:
+ return "";
+ }
+}
+
+/* Helper to get Scope for participants underneath \_SB.DPTF */
+static const char *scope_of(enum dptf_participant participant)
+{
+ static char scope[16];
+
+ if (participant == DPTF_CPU)
+ snprintf(scope, sizeof(scope), "\\_SB.%s", namestring_of(participant));
+ else
+ snprintf(scope, sizeof(scope), TOPLEVEL_DPTF_SCOPE ".%s",
+ namestring_of(participant));
+
+ return scope;
+}
+
+/* Write out scope of a participant */
+void dptf_write_scope(enum dptf_participant participant)
+{
+ acpigen_write_scope(scope_of(participant));
+}
+
+/*
+ * This table describes active cooling relationships between the system's fan and the
+ * temperature sensors that it can have an effect on. As ever-increasing temperature thresholds
+ * are crossed (_AC9.._AC0, low to high), the corresponding fan percentages listed in this table
+ * are used to increase the speed of the fan in order to speed up cooling.
+ */
+static void write_active_relationship_table(const struct dptf_active_policy *policies,
+ int max_count)
+{
+ char *pkg_count;
+ int i, j;
+
+ /* Nothing to do */
+ if (!max_count || policies[0].target == DPTF_NONE)
+ return;
+
+ acpigen_write_scope(TOPLEVEL_DPTF_SCOPE);
+ acpigen_write_method("_ART", 0);
+
+ /* Return this package */
+ acpigen_emit_byte(RETURN_OP);
+
+ /* Keep track of items added to the package */
+ pkg_count = acpigen_write_package(1); /* The '1' here is for the revision */
+ acpigen_write_integer(ART_REVISION);
+
+ for (i = 0; i < max_count; ++i) {
+ /*
+ * These have to be filled out from AC0 down to AC9, filling in only as many
+ * as are used. As soon as one isn't filled in, we're done.
+ */
+ if (policies[i].target == DPTF_NONE)
+ break;
+
+ (*pkg_count)++;
+
+ /* Source, Target, Percent, Fan % for each of _AC0 ... _AC9 */
+ acpigen_write_package(13);
+ acpigen_emit_namestring(namestring_of(DPTF_FAN));
+ acpigen_emit_namestring(namestring_of(policies[i].target));
+ acpigen_write_integer(DEFAULT_IF_0(policies[i].weight, DEFAULT_WEIGHT));
+
+ /* Write out fan %; corresponds with target's _ACx methods */
+ for (j = 0; j < DPTF_MAX_ART_THRESHOLDS; ++j)
+ acpigen_write_integer(policies[i].thresholds[j].fan_pct);
+
+ acpigen_pop_len(); /* inner Package */
+ }
+
+ acpigen_pop_len(); /* outer Package */
+ acpigen_pop_len(); /* Method _ART */
+ acpigen_pop_len(); /* Scope */
+}
+
+/*
+ * _AC9 through _AC0 represent temperature thresholds, in increasing order, defined from _AC0
+ * down, that, when reached, DPTF will activate TFN1 in order to actively cool the temperature
+ * sensor(s). As increasing thresholds are reached, the fan is spun faster.
+ */
+static void write_active_cooling_methods(const struct dptf_active_policy *policies,
+ int max_count)
+{
+ char name[5];
+ int i, j;
+
+ /* Nothing to do */
+ if (!max_count || policies[0].target == DPTF_NONE)
+ return;
+
+ for (i = 0; i < max_count; ++i) {
+ if (policies[i].target == DPTF_NONE)
+ break;
+
+ dptf_write_scope(policies[i].target);
+
+ /* Write out as many of _AC0 through _AC9 that are applicable */
+ for (j = 0; j < DPTF_MAX_ACX; ++j) {
+ if (!policies[i].thresholds[j].temp)
+ break;
+
+ snprintf(name, sizeof(name), "_AC%1X", j);
+ write_simple_return_method(name, to_acpi_temp(
+ policies[i].thresholds[j].temp));
+ }
+
+ acpigen_pop_len(); /* Scope */
+ }
+}
+
+void dptf_write_active_policies(const struct dptf_active_policy *policies, int max_count)
+{
+ write_active_relationship_table(policies, max_count);
+ write_active_cooling_methods(policies, max_count);
+}