include/syscon.h

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #ifndef __SYSCON_H
   9 #define __SYSCON_H
  10
  11 /**
  12  * struct syscon_uc_info - Information stored by the syscon UCLASS_UCLASS
  13  *
  14  * @regmap:     Register map for this controller
  15  */
  16 struct syscon_uc_info {
  17         struct regmap *regmap;
  18 };
  19
  20 /* So far there are no ops so this is a placeholder */
  21 struct syscon_ops {
  22 };
  23
  24 #define syscon_get_ops(dev)        ((struct syscon_ops *)(dev)->driver->ops)
  25
  26 /**
  27  * syscon_get_regmap() - Get access to a register map
  28  *
  29  * @dev:        Device to check (UCLASS_SCON)
  30  * @info:       Returns regmap for the device
  31  * @return 0 if OK, -ve on error
  32  */
  33 struct regmap *syscon_get_regmap(struct udevice *dev);
  34
  35 /**
  36  * syscon_get_regmap_by_driver_data() - Look up a controller by its ID
  37  *
  38  * Each system controller can be accessed by its driver data, which is
  39  * assumed to be unique through the scope of all system controllers that
  40  * are in use. This function looks up the controller given this driver data.
  41  *
  42  * @driver_data:        Driver data value to look up
  43  * @devp:               Returns the controller correponding to @driver_data
  44  * @return 0 on success, -ENODEV if the ID was not found, or other -ve error
  45  *         code
  46  */
  47 int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp);
  48
  49 /**
  50  * syscon_get_regmap_by_driver_data() - Look up a controller by its ID
  51  *
  52  * Each system controller can be accessed by its driver data, which is
  53  * assumed to be unique through the scope of all system controllers that
  54  * are in use. This function looks up the regmap given this driver data.
  55  *
  56  * @driver_data:        Driver data value to look up
  57  * @return register map correponding to @driver_data, or -ve error code
  58  */
  59 struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data);
  60
  61 /**
  62  * syscon_get_first_range() - get the first memory range from a syscon regmap
  63  *
  64  * @driver_data:        Driver data value to look up
  65  * @return first region of register map correponding to @driver_data, or
  66  *                      -ve error code
  67  */
  68 void *syscon_get_first_range(ulong driver_data);
  69
  70 #endif