.. _OPAL_LPC_READ: OPAL_LPC_READ ============= .. code-block:: c #define OPAL_LPC_READ 67 /* * Address cycle types for LPC accesses. These also correspond * to the content of the first cell of the "reg" property for * device nodes on the LPC bus */ enum OpalLPCAddressType { OPAL_LPC_MEM = 0, OPAL_LPC_IO = 1, OPAL_LPC_FW = 2, }; int64_t opal_lpc_read(uint32_t chip_id, enum OpalLPCAddressType addr_type, uint32_t addr, uint32_t *data, uint32_t sz); This function related to Low Pin Count (LPC) bus. This function reads the data from IDSEL register for ``chip_id``, which has LPC information. From ``addr`` for ``addr_type`` with read size ``sz`` bytes in to a variable named ``data``. Parameters ---------- ``chip_id`` The ``chip_id`` parameter contains value of the chip number identified at boot time. ``addr_type`` The ``addr_type`` is one of the LPC supported address types. Supported address types are: - LPC memory, - LPC IO and - LPC firmware. ``addr`` The ``addr`` from which the data has to be read. ``data`` The ``data`` will be used to store the read data. ``sz`` How many ``sz`` bytes to be read in to ``data``. Return Codes ------------ :ref:`OPAL_PARAMETER` Indicates either ``chip_id`` not found or ``chip_id`` doesn’t contain LPC information. :ref:`OPAL_SUCCESS` Indicates Success! .. _OPAL_LPC_WRITE: OPAL_LPC_WRITE ============== .. code-block:: c #define OPAL_LPC_WRITE 68 /* * Address cycle types for LPC accesses. These also correspond * to the content of the first cell of the "reg" property for * device nodes on the LPC bus */ enum OpalLPCAddressType { OPAL_LPC_MEM = 0, OPAL_LPC_IO = 1, OPAL_LPC_FW = 2, }; int64_t opal_lpc_write(uint32_t chip_id, enum OpalLPCAddressType addr_type, uint32_t addr, uint32_t data, uint32_t sz); This function related to Low Pin Count (LPC) bus. This function writes the ``data`` in to ECCB register for ``chip_id``, which has LPC information. From ``addr`` for ``addr_type`` with write size ``sz`` bytes. Parameters ---------- ``chip_id`` The ``chip_id`` parameter contains value of the chip number identified at boot time. ``addr_type`` The ``addr_type`` is one of the address types LPC supported. Supported address types are: - LPC memory, - LPC IO and - LPC firmware. ``addr`` The ``addr`` to where the ``data`` need to be written. ``data`` The ``data`` for writing. ``sz`` How many ``sz`` bytes to write. Return Codes ------------ :ref:`OPAL_PARAMETER` Indicates either ``chip_id`` not found or ``chip_id`` doesn’t contain LPC information. :ref:`OPAL_SUCCESS` Indicates Success!