diff options
Diffstat (limited to 'src/arch/x86/acpi_device.c')
| -rw-r--r-- | src/arch/x86/acpi_device.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/src/arch/x86/acpi_device.c b/src/arch/x86/acpi_device.c index 073b938101..69d44f3f33 100644 --- a/src/arch/x86/acpi_device.c +++ b/src/arch/x86/acpi_device.c @@ -24,6 +24,15 @@ #include <gpio.h> #endif +/* + * Pointer to length field in device properties package + * Location is set in dp_header() and length filled in by dp_footer() + */ +static char *dp_count_ptr; + +/* Count of the number of device properties in the current set */ +static char dp_count; + /* Write empty word value and return pointer to it */ static void *acpi_device_write_zero_len(void) { @@ -453,3 +462,129 @@ void acpi_device_write_spi(const struct acpi_spi *spi) /* Fill in SPI Descriptor Length */ acpi_device_fill_len(desc_length); } + +/* Write a header for using _DSD to export Device Properties */ +void acpi_dp_write_header(void) +{ + /* Name (_DSD) */ + acpigen_write_name("_DSD"); + + /* Package (2) */ + acpigen_write_package(2); + + /* ToUUID (ACPI_DP_UUID) */ + acpigen_write_uuid(ACPI_DP_UUID); + + /* Package (X) */ + acpigen_emit_byte(0x12); + acpigen_write_len_f(); + dp_count_ptr = acpigen_get_current(); + acpigen_emit_byte(0); /* Number of elements, filled by dp_footer */ + + /* Reset element counter */ + dp_count = 0; +} + +/* Fill in length values from writing Device Properties */ +void acpi_dp_write_footer(void) +{ + /* Patch device property element count */ + *dp_count_ptr = dp_count; + + acpigen_pop_len(); /* Inner package length */ + acpigen_pop_len(); /* Outer package length */ +} + +void acpi_dp_write_value(const struct acpi_dp *prop) +{ + switch (prop->type) { + case ACPI_DP_TYPE_INTEGER: + acpigen_write_integer(prop->integer); + break; + case ACPI_DP_TYPE_STRING: + acpigen_write_string(prop->string); + break; + case ACPI_DP_TYPE_REFERENCE: + acpigen_emit_namestring(prop->string); + break; + } +} + +/* Write Device Property key with value as an integer */ +void acpi_dp_write_keyval(const char *key, const struct acpi_dp *prop) +{ + acpigen_write_package(2); + acpigen_write_string(key); + acpi_dp_write_value(prop); + acpigen_pop_len(); + dp_count++; +} + +/* Write Device Property key with value as an integer */ +void acpi_dp_write_integer(const char *key, uint64_t value) +{ + const struct acpi_dp prop = ACPI_DP_INTEGER(value); + acpi_dp_write_keyval(key, &prop); +} + +/* Write Device Property key with value as a string */ +void acpi_dp_write_string(const char *key, const char *value) +{ + const struct acpi_dp prop = ACPI_DP_STRING(value); + acpi_dp_write_keyval(key, &prop); +} + +/* Write Device Property key with value as a reference */ +void acpi_dp_write_reference(const char *key, const char *value) +{ + const struct acpi_dp prop = ACPI_DP_REFERENCE(value); + acpi_dp_write_keyval(key, &prop); +} + +/* Write array of Device Properties */ +void acpi_dp_write_array(const char *key, const struct acpi_dp *array, int len) +{ + int i; + acpigen_write_package(2); + acpigen_write_string(key); + acpigen_write_package(len); + for (i = 0; i < len; i++) + acpi_dp_write_value(&array[i]); + acpigen_pop_len(); + acpigen_pop_len(); + dp_count++; +} + +/* Write array of Device Properties with values as integers */ +void acpi_dp_write_integer_array(const char *key, uint64_t *array, int len) +{ + int i; + acpigen_write_package(2); + acpigen_write_string(key); + acpigen_write_package(len); + for (i = 0; i < len; i++) + acpigen_write_integer(array[i]); + acpigen_pop_len(); + acpigen_pop_len(); + dp_count++; +} + +/* + * Device Properties for GPIO binding + * linux/Documentation/acpi/gpio-properties.txt + */ +void acpi_dp_write_gpio(const char *key, const char *ref, int index, + int pin, int active_low) +{ + const struct acpi_dp gpio_prop[] = { + /* The device that has _CRS containing GpioIo()/GpioInt() */ + ACPI_DP_REFERENCE(ref), + /* Index of the GPIO resource in _CRS starting from zero */ + ACPI_DP_INTEGER(index), + /* Pin in the GPIO resource, typically zero */ + ACPI_DP_INTEGER(pin), + /* Set if pin is active low */ + ACPI_DP_INTEGER(active_low) + }; + acpi_dp_write_array(key, gpio_prop, ARRAY_SIZE(gpio_prop)); +} |