diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/acpi/device.c | 74 | ||||
| -rw-r--r-- | src/include/acpi/acpi_device.h | 89 |
2 files changed, 163 insertions, 0 deletions
diff --git a/src/acpi/device.c b/src/acpi/device.c index 9e8efa4e8c..9ce86ebdbf 100644 --- a/src/acpi/device.c +++ b/src/acpi/device.c @@ -523,6 +523,80 @@ void acpi_device_write_spi(const struct acpi_spi *spi) acpi_device_fill_len(desc_length); } +/* UART Serial Bus - UARTSerialBusV2() */ +void acpi_device_write_uart(const struct acpi_uart *uart) +{ + void *desc_length, *type_length; + uint16_t flags; + + /* Byte 0: Descriptor Type */ + acpigen_emit_byte(ACPI_DESCRIPTOR_SERIAL_BUS); + + /* Byte 1+2: Length (filled in later) */ + desc_length = acpi_device_write_zero_len(); + + /* Byte 3: Revision ID */ + acpigen_emit_byte(ACPI_UART_SERIAL_BUS_REVISION_ID); + + /* Byte 4: Resource Source Index is Reserved */ + acpigen_emit_byte(0); + + /* Byte 5: Serial Bus Type is UART */ + acpigen_emit_byte(ACPI_SERIAL_BUS_TYPE_UART); + + /* + * Byte 6: Flags + * [7:2]: 0 => Reserved + * [1]: 1 => ResourceConsumer + * [0]: 0 => ControllerInitiated + */ + acpigen_emit_byte(BIT(1)); + + /* + * Byte 7-8: Type Specific Flags + * [15:8]: 0 => Reserved + * [7]: 0 => Little Endian, 1 => Big Endian + * [6:4]: Data bits + * [3:2]: Stop bits + * [1:0]: Flow control + */ + flags = uart->flow_control & 3; + flags |= (uart->stop_bits & 3) << 2; + flags |= (uart->data_bits & 7) << 4; + flags |= (uart->endian & 1) << 7; + acpigen_emit_word(flags); + + /* Byte 9: Type Specific Revision ID */ + acpigen_emit_byte(ACPI_UART_TYPE_SPECIFIC_REVISION_ID); + + /* Byte 10-11: Type Data Length */ + type_length = acpi_device_write_zero_len(); + + /* Byte 12-15: Initial Baud Rate */ + acpigen_emit_dword(uart->initial_baud_rate); + + /* Byte 16-17: RX FIFO size */ + acpigen_emit_word(uart->rx_fifo_bytes); + + /* Byte 18-19: TX FIFO size */ + acpigen_emit_word(uart->tx_fifo_bytes); + + /* Byte 20: Parity */ + acpigen_emit_byte(uart->parity); + + /* Byte 21: Lines Enabled */ + acpigen_emit_byte(uart->lines_in_use); + + /* Fill in Type Data Length */ + acpi_device_fill_len(type_length); + + /* Byte 22+: ResourceSource */ + acpigen_emit_string(uart->resource); + + /* Fill in Descriptor Length */ + acpi_device_fill_len(desc_length); +} + /* PowerResource() with Enable and/or Reset control */ void acpi_device_add_power_res(const struct acpi_power_res_params *params) { diff --git a/src/include/acpi/acpi_device.h b/src/include/acpi/acpi_device.h index 2c2c67a119..8cf36e344f 100644 --- a/src/include/acpi/acpi_device.h +++ b/src/include/acpi/acpi_device.h @@ -323,10 +323,14 @@ void acpi_device_write_gpio(const struct acpi_gpio *gpio); #define ACPI_SERIAL_BUS_TYPE_I2C 1 #define ACPI_SERIAL_BUS_TYPE_SPI 2 +#define ACPI_SERIAL_BUS_TYPE_UART 3 + #define ACPI_I2C_SERIAL_BUS_REVISION_ID 1 /* TODO: upgrade to 2 */ #define ACPI_I2C_TYPE_SPECIFIC_REVISION_ID 1 #define ACPI_SPI_SERIAL_BUS_REVISION_ID 1 #define ACPI_SPI_TYPE_SPECIFIC_REVISION_ID 1 +#define ACPI_UART_SERIAL_BUS_REVISION_ID 1 +#define ACPI_UART_TYPE_SPECIFIC_REVISION_ID 1 /* * ACPI I2C Bus @@ -372,6 +376,91 @@ struct acpi_spi { /* Write SPI Bus descriptor to SSDT AML output */ void acpi_device_write_spi(const struct acpi_spi *spi); +/* + * ACPI UART Bus + */ + +enum acpi_uart_data_bits { + ACPI_UART_DATA_BITS_5, + ACPI_UART_DATA_BITS_6, + ACPI_UART_DATA_BITS_7, + ACPI_UART_DATA_BITS_8, + ACPI_UART_DATA_BITS_9 +}; + +enum acpi_uart_stop_bits { + ACPI_UART_STOP_BITS_0, + ACPI_UART_STOP_BITS_1, + ACPI_UART_STOP_BITS_1_5, + ACPI_UART_STOP_BITS_2 +}; + +enum acpi_uart_lines { + ACPI_UART_LINE_DTD = BIT(2), /* Data Carrier Detect */ + ACPI_UART_LINE_RI = BIT(3), /* Ring Indicator */ + ACPI_UART_LINE_DSR = BIT(4), /* Data Set Ready */ + ACPI_UART_LINE_DTR = BIT(5), /* Data Terminal Ready */ + ACPI_UART_LINE_CTS = BIT(6), /* Clear to Send */ + ACPI_UART_LINE_RTS = BIT(7) /* Request to Send */ +}; + +enum acpi_uart_endian { + ACPI_UART_ENDIAN_LITTLE, + ACPI_UART_ENDIAN_BIG +}; + +enum acpi_uart_parity { + ACPI_UART_PARITY_NONE, + ACPI_UART_PARITY_EVEN, + ACPI_UART_PARITY_ODD, + ACPI_UART_PARITY_MARK, + ACPI_UART_PARITY_SPACE +}; + +enum acpi_uart_flow_control { + ACPI_UART_FLOW_NONE, + ACPI_UART_FLOW_HARDWARE, + ACPI_UART_FLOW_SOFTWARE +}; + +struct acpi_uart { + /* Initial Baud Rate in bits per second */ + uint32_t initial_baud_rate; + /* Number of bits of data in a packet (value between 5-9) */ + enum acpi_uart_data_bits data_bits; + /* Number of bits to signal end of packet */ + enum acpi_uart_stop_bits stop_bits; + /* Bitmask indicating presence or absence of particular line */ + unsigned int lines_in_use; + /* Specify if the device expects big or little endian format */ + enum acpi_uart_endian endian; + /* Specify the type of parity bits included after the data in a packet */ + enum acpi_uart_parity parity; + /* Specify the flow control method */ + enum acpi_uart_flow_control flow_control; + /* Upper limit in bytes of the buffer sizes for this device */ + uint16_t rx_fifo_bytes; + uint16_t tx_fifo_bytes; + /* Set true if UART is shared, false if it is exclusive for one device */ + bool shared; + /* Reference to UART controller */ + const char *resource; +}; + +#define ACPI_UART_RAW_DEVICE(baud_rate, fifo_bytes) { \ + .initial_baud_rate = (baud_rate), \ + .data_bits = ACPI_UART_DATA_BITS_8, \ + .stop_bits = ACPI_UART_STOP_BITS_1, \ + .endian = ACPI_UART_ENDIAN_LITTLE, \ + .parity = ACPI_UART_PARITY_NONE, \ + .flow_control = ACPI_UART_FLOW_NONE, \ + .rx_fifo_bytes = (fifo_bytes), \ + .tx_fifo_bytes = (fifo_bytes), \ + .shared = false } + +/* Write UARTSerialBusV2() descriptor to SSDT AML output */ +void acpi_device_write_uart(const struct acpi_uart *uart); + /* GPIO/timing information for the power on/off sequences */ struct acpi_power_res_params { /* GPIO used to take device out of reset or to put it into reset. */ |