t83x/kernel/drivers/gpu/arm/midgard/mali_uk.h

   1 /*
   2  *
   3  * (C) COPYRIGHT 2010, 2012-2015 ARM Limited. All rights reserved.
   4  *
   5  * This program is free software and is provided to you under the terms of the
   6  * GNU General Public License version 2 as published by the Free Software
   7  * Foundation, and any use by you of this program is subject to the terms
   8  * of such GNU licence.
   9  *
  10  * A copy of the licence is included with the program, and can also be obtained
  11  * from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  12  * Boston, MA  02110-1301, USA.
  13  *
  14  */
  15
  16
  17
  18
  19
  20 /**
  21  * @file mali_uk.h
  22  * Types and definitions that are common across OSs for both the user
  23  * and kernel side of the User-Kernel interface.
  24  */
  25
  26 #ifndef _UK_H_
  27 #define _UK_H_
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif                          /* __cplusplus */
  32
  33 /**
  34  * @addtogroup base_api
  35  * @{
  36  */
  37
  38 /**
  39  * @defgroup uk_api User-Kernel Interface API
  40  *
  41  * The User-Kernel Interface abstracts the communication mechanism between the user and kernel-side code of device
  42  * drivers developed as part of the Midgard DDK. Currently that includes the Base driver and the UMP driver.
  43  *
  44  * It exposes an OS independent API to user-side code (UKU) which routes functions calls to an OS-independent
  45  * kernel-side API (UKK) via an OS-specific communication mechanism.
  46  *
  47  * This API is internal to the Midgard DDK and is not exposed to any applications.
  48  *
  49  * @{
  50  */
  51
  52 /**
  53  * These are identifiers for kernel-side drivers implementing a UK interface, aka UKK clients. The
  54  * UK module maps this to an OS specific device name, e.g. "gpu_base" -> "GPU0:". Specify this
  55  * identifier to select a UKK client to the uku_open() function.
  56  *
  57  * When a new UKK client driver is created a new identifier needs to be added to the uk_client_id
  58  * enumeration and the uku_open() implemenation for the various OS ports need to be updated to
  59  * provide a mapping of the identifier to the OS specific device name.
  60  *
  61  */
  62 enum uk_client_id {
  63         /**
  64          * Value used to identify the Base driver UK client.
  65          */
  66         UK_CLIENT_MALI_T600_BASE,
  67
  68         /** The number of uk clients supported. This must be the last member of the enum */
  69         UK_CLIENT_COUNT
  70 };
  71
  72 /**
  73  * Each function callable through the UK interface has a unique number.
  74  * Functions provided by UK clients start from number UK_FUNC_ID.
  75  * Numbers below UK_FUNC_ID are used for internal UK functions.
  76  */
  77 enum uk_func {
  78         UKP_FUNC_ID_CHECK_VERSION,   /**< UKK Core internal function */
  79         /**
  80          * Each UK client numbers the functions they provide starting from
  81          * number UK_FUNC_ID. This number is then eventually assigned to the
  82          * id field of the union uk_header structure when preparing to make a
  83          * UK call. See your UK client for a list of their function numbers.
  84          */
  85         UK_FUNC_ID = 512
  86 };
  87
  88 /**
  89  * Arguments for a UK call are stored in a structure. This structure consists
  90  * of a fixed size header and a payload. The header carries a 32-bit number
  91  * identifying the UK function to be called (see uk_func). When the UKK client
  92  * receives this header and executed the requested UK function, it will use
  93  * the same header to store the result of the function in the form of a
  94  * int return code. The size of this structure is such that the
  95  * first member of the payload following the header can be accessed efficiently
  96  * on a 32 and 64-bit kernel and the structure has the same size regardless
  97  * of a 32 or 64-bit kernel. The uk_kernel_size_type type should be defined
  98  * accordingly in the OS specific mali_uk_os.h header file.
  99  */
 100 union uk_header {
 101         /**
 102          * 32-bit number identifying the UK function to be called.
 103          * Also see uk_func.
 104          */
 105         u32 id;
 106         /**
 107          * The int return code returned by the called UK function.
 108          * See the specification of the particular UK function you are
 109          * calling for the meaning of the error codes returned. All
 110          * UK functions return 0 on success.
 111          */
 112         u32 ret;
 113         /*
 114          * Used to ensure 64-bit alignment of this union. Do not remove.
 115          * This field is used for padding and does not need to be initialized.
 116          */
 117         u64 sizer;
 118 };
 119
 120 /**
 121  * This structure carries a 16-bit major and minor number and is sent along with an internal UK call
 122  * used during uku_open to identify the versions of the UK module in use by the user-side and kernel-side.
 123  */
 124 struct uku_version_check_args {
 125         union uk_header header;
 126                   /**< UK call header */
 127         u16 major;
 128            /**< This field carries the user-side major version on input and the kernel-side major version on output */
 129         u16 minor;
 130            /**< This field carries the user-side minor version on input and the kernel-side minor version on output. */
 131         u8 padding[4];
 132 };
 133
 134 /** @} end group uk_api */
 135
 136 /** @} *//* end group base_api */
 137
 138 #ifdef __cplusplus
 139 }
 140 #endif                          /* __cplusplus */
 141 #endif                          /* _UK_H_ */