acpi: Add support for SSDT generation
Some devices need to generate code for the Secondary System Descriptor Table (SSDT). Add a method to handle this. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
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@ -256,6 +256,7 @@
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acpi-test {
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compatible = "denx,u-boot-acpi-test";
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acpi-ssdt-test-data = "ab";
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child {
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compatible = "denx,u-boot-acpi-test";
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};
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@ -263,6 +264,7 @@
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acpi-test2 {
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compatible = "denx,u-boot-acpi-test";
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acpi-ssdt-test-data = "cd";
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};
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clocks {
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@ -18,6 +18,7 @@
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/* Type of method to call */
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enum method_t {
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METHOD_WRITE_TABLES,
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METHOD_FILL_SSDT,
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};
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/* Prototype for all methods */
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@ -51,6 +52,8 @@ acpi_method acpi_get_method(struct udevice *dev, enum method_t method)
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switch (method) {
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case METHOD_WRITE_TABLES:
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return aops->write_tables;
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case METHOD_FILL_SSDT:
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return aops->fill_ssdt;
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}
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}
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@ -84,6 +87,17 @@ int acpi_recurse_method(struct acpi_ctx *ctx, struct udevice *parent,
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return 0;
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}
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int acpi_fill_ssdt(struct acpi_ctx *ctx)
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{
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int ret;
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log_debug("Writing SSDT tables\n");
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ret = acpi_recurse_method(ctx, dm_root(), METHOD_FILL_SSDT);
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log_debug("Writing SSDT finished, err=%d\n", ret);
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return ret;
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}
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int acpi_write_dev_tables(struct acpi_ctx *ctx)
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{
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int ret;
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@ -74,6 +74,19 @@ struct acpi_ops {
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* @return 0 if OK, -ve on error
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*/
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int (*write_tables)(const struct udevice *dev, struct acpi_ctx *ctx);
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/**
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* fill_ssdt() - Generate SSDT code for a device
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*
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* This is called to create the SSDT code. The method should write out
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* whatever ACPI code is needed by this device. It will end up in the
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* SSDT table.
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*
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* @dev: Device to write
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* @ctx: ACPI context to use
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* @return 0 if OK, -ve on error
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*/
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int (*fill_ssdt)(const struct udevice *dev, struct acpi_ctx *ctx);
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};
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#define device_get_acpi_ops(dev) ((dev)->driver->acpi_ops)
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@ -118,6 +131,16 @@ int acpi_copy_name(char *out_name, const char *name);
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*/
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int acpi_write_dev_tables(struct acpi_ctx *ctx);
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/**
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* acpi_fill_ssdt() - Generate ACPI tables for SSDT
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*
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* This is called to create the SSDT code for all devices.
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*
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* @ctx: ACPI context to use
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* @return 0 if OK, -ve on error
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*/
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int acpi_fill_ssdt(struct acpi_ctx *ctx);
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#endif /* __ACPI__ */
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#endif
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@ -14,6 +14,7 @@
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#include <version.h>
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#include <tables_csum.h>
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#include <version.h>
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#include <acpi/acpigen.h>
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#include <acpi/acpi_device.h>
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#include <acpi/acpi_table.h>
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#include <dm/acpi.h>
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@ -67,9 +68,23 @@ static int testacpi_get_name(const struct udevice *dev, char *out_name)
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return acpi_copy_name(out_name, ACPI_TEST_DEV_NAME);
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}
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static int testacpi_fill_ssdt(const struct udevice *dev, struct acpi_ctx *ctx)
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{
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const char *data;
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data = dev_read_string(dev, "acpi-ssdt-test-data");
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if (data) {
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while (*data)
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acpigen_emit_byte(ctx, *data++);
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}
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return 0;
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}
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struct acpi_ops testacpi_ops = {
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.get_name = testacpi_get_name,
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.write_tables = testacpi_write_tables,
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.fill_ssdt = testacpi_fill_ssdt,
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};
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static const struct udevice_id testacpi_ids[] = {
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@ -396,3 +411,30 @@ static int dm_test_acpi_device_status(struct unit_test_state *uts)
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return 0;
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}
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DM_TEST(dm_test_acpi_device_status, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
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/* Test acpi_fill_ssdt() */
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static int dm_test_acpi_fill_ssdt(struct unit_test_state *uts)
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{
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struct acpi_ctx ctx;
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u8 *buf;
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buf = malloc(BUF_SIZE);
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ut_assertnonnull(buf);
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ctx.current = buf;
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buf[4] = 'z'; /* sentinel */
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ut_assertok(acpi_fill_ssdt(&ctx));
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/* These values come from acpi-test's acpi-ssdt-test-data property */
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ut_asserteq('a', buf[0]);
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ut_asserteq('b', buf[1]);
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/* These values come from acpi-test2's acpi-ssdt-test-data property */
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ut_asserteq('c', buf[2]);
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ut_asserteq('d', buf[3]);
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ut_asserteq('z', buf[4]);
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return 0;
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}
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DM_TEST(dm_test_acpi_fill_ssdt, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
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