Add a /chosen property to control the order in which the data appears in the SSDT. This allows matching up U-Boot's output from a dump of the known-good data obtained from within Linux.
Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v2: - Generalise the ACPI function recursion with acpi_recurse_method()
arch/sandbox/dts/test.dts | 5 ++- doc/device-tree-bindings/chosen.txt | 9 +++++ drivers/core/acpi.c | 62 +++++++++++++++++++++++++++++ test/dm/acpi.c | 17 ++++---- 4 files changed, 84 insertions(+), 9 deletions(-)
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts index fefa3af999..7d55d360f6 100644 --- a/arch/sandbox/dts/test.dts +++ b/arch/sandbox/dts/test.dts @@ -206,12 +206,12 @@ compatible = "denx,u-boot-devres-test"; };
- acpi-test { + acpi_test1: acpi-test { compatible = "denx,u-boot-acpi-test"; acpi-ssdt-test-data = "ab"; };
- acpi-test2 { + acpi_test2: acpi-test2 { compatible = "denx,u-boot-acpi-test"; acpi-ssdt-test-data = "cd"; }; @@ -829,6 +829,7 @@ setting = "sunrise ohoka"; other-node = "/some-bus/c-test@5"; int-values = <0x1937 72993>; + u-boot,acpi-ssdt-order = <&acpi_test2 &acpi_test1>; chosen-test { compatible = "denx,u-boot-fdt-test"; reg = <9 1>; diff --git a/doc/device-tree-bindings/chosen.txt b/doc/device-tree-bindings/chosen.txt index 395c9501e3..d4dfc05847 100644 --- a/doc/device-tree-bindings/chosen.txt +++ b/doc/device-tree-bindings/chosen.txt @@ -134,3 +134,12 @@ Example phandlepart = <&mmc 1>; }; }; + +u-boot,acpi-ssdt-order +---------------------- + +This provides the ordering to use when writing device data to the ACPI SSDT +(Secondary System Descriptor Table). Each cell is a phandle pointer to a device +node to add. The ACPI information is written in this order. + +If the ordering does not include all nodes, an error is generated. diff --git a/drivers/core/acpi.c b/drivers/core/acpi.c index 7b295bf921..2f57ff9da2 100644 --- a/drivers/core/acpi.c +++ b/drivers/core/acpi.c @@ -106,6 +106,63 @@ static int acpi_add_item(struct acpi_ctx *ctx, struct udevice *dev, return 0; }
+struct acpi_item *find_item(const char *devname) +{ + int i; + + for (i = 0; i < item_count; i++) { + struct acpi_item *item = &acpi_item[i]; + + if (!strcmp(devname, item->dev->name)) + return item; + } + + return NULL; +} + +static int build_type(struct acpi_ctx *ctx, void *start, enum gen_type_t type) +{ + const u32 *order; + int size; + int count; + void *ptr; + void *end = ctx->current; + + ptr = start; + order = ofnode_read_chosen_prop("u-boot,acpi-ssdt-order", &size); + if (!order) { + log_warning("Failed to find ordering, leaving as is\n"); + return 0; + } + + count = size / sizeof(u32); + while (count--) { + struct acpi_item *item; + const char *name; + ofnode node; + + node = ofnode_get_by_phandle(fdt32_to_cpu(*order++)); + name = ofnode_get_name(node); + item = find_item(name); + if (!item) { + log_err("Failed to find item '%s'\n", name); + return log_msg_ret("find", -ENOENT); + } + if (item->type == type) { + log_debug(" - add %s\n", item->dev->name); + memcpy(ptr, item->buf, item->size); + ptr += item->size; + } + } + + if (ptr != end) { + log_warning("*** Missing bytes: ptr=%p, end=%p\n", ptr, end); + return -ENXIO; + } + + return 0; +} + acpi_method acpi_get_method(struct udevice *dev, enum method_t method) { struct acpi_ops *aops; @@ -160,11 +217,16 @@ int acpi_recurse_method(struct acpi_ctx *ctx, struct udevice *parent,
int acpi_fill_ssdt(struct acpi_ctx *ctx) { + void *start = ctx->current; int ret;
log_debug("Writing SSDT tables\n"); + item_count = 0; ret = acpi_recurse_method(ctx, dm_root(), METHOD_FILL_SDDT, TYPE_SSDT); log_debug("Writing SSDT finished, err=%d\n", ret); + ret = build_type(ctx, start, TYPE_SSDT); + if (ret) + return log_msg_ret("build", ret);
return ret; } diff --git a/test/dm/acpi.c b/test/dm/acpi.c index 305d8395ff..b0d8d41e49 100644 --- a/test/dm/acpi.c +++ b/test/dm/acpi.c @@ -336,16 +336,19 @@ static int dm_test_acpi_fill_ssdt(struct unit_test_state *uts) ut_assertnonnull(buf);
ctx.current = buf; - buf[4] = 'z'; /* sentinal */ + buf[4] = 'z'; /* sentinel */ ut_assertok(acpi_fill_ssdt(&ctx));
- /* These values come from acpi-test's acpi-ssdt-test-data property */ - ut_asserteq('a', buf[0]); - ut_asserteq('b', buf[1]); + /* + * These values come from acpi-test2's acpi-ssdt-test-data property. + * This device comes first because of u-boot,acpi-ssdt-order + */ + ut_asserteq('c', buf[0]); + ut_asserteq('d', buf[1]);
- /* These values come from acpi-test2's acpi-ssdt-test-data property */ - ut_asserteq('c', buf[2]); - ut_asserteq('d', buf[3]); + /* These values come from acpi-test's acpi-ssdt-test-data property */ + ut_asserteq('a', buf[2]); + ut_asserteq('b', buf[3]);
ut_asserteq('z', buf[4]);