1.. _OPAL_LPC_READ: 2 3OPAL_LPC_READ 4============= 5 6.. code-block:: c 7 8 #define OPAL_LPC_READ 67 9 10 /* 11 * Address cycle types for LPC accesses. These also correspond 12 * to the content of the first cell of the "reg" property for 13 * device nodes on the LPC bus 14 */ 15 enum OpalLPCAddressType { 16 OPAL_LPC_MEM = 0, 17 OPAL_LPC_IO = 1, 18 OPAL_LPC_FW = 2, 19 }; 20 21 int64_t opal_lpc_read(uint32_t chip_id, enum OpalLPCAddressType addr_type, 22 uint32_t addr, uint32_t *data, uint32_t sz); 23 24This function related to Low Pin Count (LPC) bus. This function reads the 25data from IDSEL register for ``chip_id``, which has LPC information. 26From ``addr`` for ``addr_type`` with read size ``sz`` bytes in to a 27variable named ``data``. 28 29Parameters 30---------- 31 32``chip_id`` 33 The ``chip_id`` parameter contains value of the chip number identified at 34 boot time. 35``addr_type`` 36 The ``addr_type`` is one of the LPC supported address types. 37 Supported address types are: 38 39 - LPC memory, 40 - LPC IO and 41 - LPC firmware. 42 43``addr`` 44 The ``addr`` from which the data has to be read. 45``data`` 46 The ``data`` will be used to store the read data. 47``sz`` 48 How many ``sz`` bytes to be read in to ``data``. 49 50Return Codes 51------------ 52 53:ref:`OPAL_PARAMETER` 54 Indicates either ``chip_id`` not found or ``chip_id`` doesn’t contain 55 LPC information. 56:ref:`OPAL_SUCCESS` 57 Indicates Success! 58 59.. _OPAL_LPC_WRITE: 60 61OPAL_LPC_WRITE 62============== 63 64.. code-block:: c 65 66 #define OPAL_LPC_WRITE 68 67 68 /* 69 * Address cycle types for LPC accesses. These also correspond 70 * to the content of the first cell of the "reg" property for 71 * device nodes on the LPC bus 72 */ 73 enum OpalLPCAddressType { 74 OPAL_LPC_MEM = 0, 75 OPAL_LPC_IO = 1, 76 OPAL_LPC_FW = 2, 77 }; 78 79 int64_t opal_lpc_write(uint32_t chip_id, enum OpalLPCAddressType addr_type, 80 uint32_t addr, uint32_t data, uint32_t sz); 81 82This function related to Low Pin Count (LPC) bus. This function writes the 83``data`` in to ECCB register for ``chip_id``, which has LPC information. 84From ``addr`` for ``addr_type`` with write size ``sz`` bytes. 85 86Parameters 87---------- 88 89``chip_id`` 90 The ``chip_id`` parameter contains value of the chip number identified at 91 boot time. 92``addr_type`` 93 The ``addr_type`` is one of the address types LPC supported. 94 Supported address types are: 95 96 - LPC memory, 97 - LPC IO and 98 - LPC firmware. 99 100``addr`` 101 The ``addr`` to where the ``data`` need to be written. 102``data`` 103 The ``data`` for writing. 104``sz`` 105 How many ``sz`` bytes to write. 106 107Return Codes 108------------ 109 110:ref:`OPAL_PARAMETER` 111 Indicates either ``chip_id`` not found or ``chip_id`` doesn’t contain LPC 112 information. 113:ref:`OPAL_SUCCESS` 114 Indicates Success! 115