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@chromium.org Reviewed-by: Wolfgang Wallner wolfgang.wallner@br-automation.com ---
Changes in v4: - Explain why 'fill' is used for one method and 'inject' for another
Changes in v3: - Fix 'THe' typo - Rename build_type() to sort_acpi_item_type()
Changes in v1: - Generalise the ACPI function recursion with acpi_recurse_method()
arch/sandbox/dts/test.dts | 2 ++ drivers/core/acpi.c | 25 +++++++++++++++++++++- include/dm/acpi.h | 30 ++++++++++++++++++++++++++ test/dm/acpi.c | 44 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 100 insertions(+), 1 deletion(-)
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts index 6687efe2ae..fc6a6b1774 100644 --- a/arch/sandbox/dts/test.dts +++ b/arch/sandbox/dts/test.dts @@ -257,6 +257,7 @@ acpi_test1: acpi-test { compatible = "denx,u-boot-acpi-test"; acpi-ssdt-test-data = "ab"; + acpi-dsdt-test-data = "hi"; child { compatible = "denx,u-boot-acpi-test"; }; @@ -265,6 +266,7 @@ 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 a9b7fc1d9a..7b32694ad4 100644 --- a/drivers/core/acpi.c +++ b/drivers/core/acpi.c @@ -22,12 +22,14 @@ enum gen_type_t { TYPE_NONE, TYPE_SSDT, + TYPE_DSDT, };
/* Type of method to call */ enum method_t { METHOD_WRITE_TABLES, METHOD_FILL_SSDT, + METHOD_INJECT_DSDT, };
/* Prototype for all methods */ @@ -144,7 +146,9 @@ static int sort_acpi_item_type(struct acpi_ctx *ctx, void *start, void *end = ctx->current;
ptr = start; - order = ofnode_read_chosen_prop("u-boot,acpi-ssdt-order", &size); + order = ofnode_read_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; @@ -198,6 +202,8 @@ acpi_method acpi_get_method(struct udevice *dev, enum method_t method) return aops->write_tables; case METHOD_FILL_SSDT: return aops->fill_ssdt; + case METHOD_INJECT_DSDT: + return aops->inject_dsdt; } }
@@ -256,6 +262,23 @@ int acpi_fill_ssdt(struct acpi_ctx *ctx) return ret; }
+int acpi_inject_dsdt(struct acpi_ctx *ctx) +{ + void *start = ctx->current; + int ret; + + log_debug("Writing DSDT tables\n"); + item_count = 0; + ret = acpi_recurse_method(ctx, dm_root(), METHOD_INJECT_DSDT, + TYPE_DSDT); + log_debug("Writing DSDT finished, err=%d\n", ret); + ret = sort_acpi_item_type(ctx, start, TYPE_DSDT); + if (ret) + return log_msg_ret("build", ret); + + return ret; +} + int acpi_write_dev_tables(struct acpi_ctx *ctx) { int ret; diff --git a/include/dm/acpi.h b/include/dm/acpi.h index e956e49680..72fa71d0a2 100644 --- a/include/dm/acpi.h +++ b/include/dm/acpi.h @@ -82,11 +82,31 @@ struct acpi_ops { * whatever ACPI code is needed by this device. It will end up in the * SSDT table. * + * Note that this is called 'fill' because the entire contents of the + * SSDT is build by calling this method on all devices. + * * @dev: Device to write * @ctx: ACPI context to use * @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. + * + * Note that this is called 'inject' because the output of calling this + * method on all devices is injected into the DSDT, the bulk of which + * is writte in .asl files for the board. + * + * @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) @@ -141,6 +161,16 @@ 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 4e1d401e0d..1abde65c8c 100644 --- a/test/dm/acpi.c +++ b/test/dm/acpi.c @@ -81,10 +81,24 @@ 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"); + if (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[] = { @@ -441,3 +455,33 @@ 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); + +/* 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);