[PATCH 038/108] acpi: Add support for DSDT generation
Simon Glass
sjg at chromium.org
Mon Jan 27 06:05:45 CET 2020
Some devices need to inject extra code into the Differentiated System
Descriptor Table (DSDT). Add a method to handle this.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
arch/sandbox/dts/test.dts | 2 ++
drivers/core/acpi.c | 50 ++++++++++++++++++++++++++++++++++++++-
include/dm/acpi.h | 23 ++++++++++++++++++
test/dm/acpi.c | 44 +++++++++++++++++++++++++++++++++-
4 files changed, 117 insertions(+), 2 deletions(-)
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 100953452a..f60f0adc05 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -209,11 +209,13 @@
acpi_test1: acpi-test {
compatible = "denx,u-boot-acpi-test";
acpi-ssdt-test-data = "ab";
+ acpi-dsdt-test-data = "hi";
};
acpi_test2: acpi-test2 {
compatible = "denx,u-boot-acpi-test";
acpi-ssdt-test-data = "cd";
+ acpi-dsdt-test-data = "jk";
};
clocks {
diff --git a/drivers/core/acpi.c b/drivers/core/acpi.c
index b8e192dce5..657753ebb3 100644
--- a/drivers/core/acpi.c
+++ b/drivers/core/acpi.c
@@ -18,6 +18,7 @@
/* Type of table that we collected */
enum gen_type_t {
+ TYPE_DSDT,
TYPE_SSDT,
};
@@ -118,7 +119,9 @@ static int build_type(struct acpi_ctx *ctx, void *start, enum gen_type_t type)
void *end = ctx->current;
ptr = start;
- order = ofnode_get_chosen_prop("u-boot,acpi-ssdt-order", &size);
+ order = ofnode_get_chosen_prop(type == TYPE_DSDT ?
+ "u-boot,acpi-dsdt-order" :
+ "u-boot,acpi-ssdt-order", &size);
if (!order) {
log_warning("Failed to find ordering, leaving as is\n");
return 0;
@@ -200,6 +203,51 @@ int acpi_fill_ssdt(struct acpi_ctx *ctx)
return ret;
}
+int _acpi_inject_dsdt(struct acpi_ctx *ctx, struct udevice *parent)
+{
+ struct acpi_ops *aops;
+ struct udevice *dev;
+ int ret;
+
+ aops = device_get_acpi_ops(parent);
+ if (aops && aops->inject_dsdt) {
+ void *start = ctx->current;
+
+ log_debug("- %s %p\n", parent->name, aops->inject_dsdt);
+ ret = device_ofdata_to_platdata(parent);
+ if (ret)
+ return log_msg_ret("ofdata", ret);
+ ret = aops->inject_dsdt(parent, ctx);
+ if (ret)
+ return ret;
+ ret = acpi_add_item(ctx, parent, TYPE_DSDT, start);
+ if (ret)
+ return ret;
+ }
+ device_foreach_child(dev, parent) {
+ ret = _acpi_inject_dsdt(ctx, dev);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+int acpi_inject_dsdt(struct acpi_ctx *ctx)
+{
+ void *start = ctx->current;
+ int ret;
+
+ log_debug("Writing DSDT tables\n");
+ ret = _acpi_inject_dsdt(ctx, dm_root());
+ log_debug("Writing DSDT finished, err=%d\n", ret);
+ ret = build_type(ctx, start, TYPE_DSDT);
+ if (ret)
+ return log_msg_ret("build", ret);
+
+ return ret;
+}
+
int _acpi_write_dev_tables(struct acpi_ctx *ctx, const struct udevice *parent)
{
struct acpi_ops *aops;
diff --git a/include/dm/acpi.h b/include/dm/acpi.h
index c340c21685..8de9296e71 100644
--- a/include/dm/acpi.h
+++ b/include/dm/acpi.h
@@ -85,6 +85,19 @@ struct acpi_ops {
* @return 0 if OK, -ve on error
*/
int (*fill_ssdt)(const struct udevice *dev, struct acpi_ctx *ctx);
+
+ /**
+ * inject_dsdt() - Generate DSDT code for a device
+ *
+ * This is called to create the DSDT code. THe method should write out
+ * whatever ACPI code is needed by this device. It will end up in the
+ * DSDT table.
+ *
+ * @dev: Device to write
+ * @ctx: ACPI context to use
+ * @return 0 if OK, -ve on error
+ */
+ int (*inject_dsdt)(const struct udevice *dev, struct acpi_ctx *ctx);
};
#define device_get_acpi_ops(dev) ((dev)->driver->acpi_ops)
@@ -139,6 +152,16 @@ int acpi_write_dev_tables(struct acpi_ctx *ctx);
*/
int acpi_fill_ssdt(struct acpi_ctx *ctx);
+/**
+ * acpi_inject_dsdt() - Generate ACPI tables for DSDT
+ *
+ * This is called to create the DSDT code for all devices.
+ *
+ * @ctx: ACPI context to use
+ * @return 0 if OK, -ve on error
+ */
+int acpi_inject_dsdt(struct acpi_ctx *ctx);
+
#endif /* __ACPI__ */
#endif
diff --git a/test/dm/acpi.c b/test/dm/acpi.c
index 3221563ca6..16dc0955be 100644
--- a/test/dm/acpi.c
+++ b/test/dm/acpi.c
@@ -54,10 +54,22 @@ static int testacpi_fill_ssdt(const struct udevice *dev, struct acpi_ctx *ctx)
return 0;
}
+static int testacpi_inject_dsdt(const struct udevice *dev, struct acpi_ctx *ctx)
+{
+ const char *data;
+
+ data = dev_read_string(dev, "acpi-dsdt-test-data");
+ while (*data)
+ acpigen_emit_byte(ctx, *data++);
+
+ return 0;
+}
+
struct acpi_ops testacpi_ops = {
.get_name = testacpi_get_name,
.write_tables = testacpi_write_tables,
.fill_ssdt = testacpi_fill_ssdt,
+ .inject_dsdt = testacpi_inject_dsdt,
};
static const struct udevice_id testacpi_ids[] = {
@@ -354,4 +366,34 @@ static int dm_test_acpi_fill_ssdt(struct unit_test_state *uts)
return 0;
}
-`DM_TEST(dm_test_acpi_fill_ssdt, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+DM_TEST(dm_test_acpi_fill_ssdt, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test acpi_inject_dsdt() */
+static int dm_test_acpi_inject_dsdt(struct unit_test_state *uts)
+{
+ struct acpi_ctx ctx;
+ u8 *buf;
+
+ buf = malloc(BUF_SIZE);
+ ut_assertnonnull(buf);
+
+ ctx.current = buf;
+ buf[4] = 'z'; /* sentinel */
+ ut_assertok(acpi_inject_dsdt(&ctx));
+
+ /*
+ * These values come from acpi-test's acpi-dsdt-test-data property.
+ * There is no u-boot,acpi-dsdt-order so device-tree order is used.
+ */
+ ut_asserteq('h', buf[0]);
+ ut_asserteq('i', buf[1]);
+
+ /* These values come from acpi-test's acpi-dsdt-test-data property */
+ ut_asserteq('j', buf[2]);
+ ut_asserteq('k', buf[3]);
+
+ ut_asserteq('z', buf[4]);
+
+ return 0;
+}
+DM_TEST(dm_test_acpi_inject_dsdt, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
--
2.25.0.341.g760bfbb309-goog
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