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 #include <fdtdec.h>
  12
  13 /**
  14  * struct syscon_uc_info - Information stored by the syscon UCLASS_UCLASS
  15  *
  16  * @regmap:     Register map for this controller
  17  */
  18 struct syscon_uc_info {
  19         struct regmap *regmap;
  20 };
  21
  22 /* So far there are no ops so this is a placeholder */
  23 struct syscon_ops {
  24 };
  25
  26 #define syscon_get_ops(dev)        ((struct syscon_ops *)(dev)->driver->ops)
  27
  28 #if CONFIG_IS_ENABLED(OF_PLATDATA)
  29 /*
  30  * We don't support 64-bit machines. If they are so resource-contrained that
  31  * they need to use OF_PLATDATA, something is horribly wrong with the
  32  * education of our hardware engineers.
  33  *
  34  * Update: 64-bit is now supported and we have an education crisis.
  35  */
  36 struct syscon_base_platdata {
  37         fdt_val_t reg[2];
  38 };
  39 #endif
  40
  41 /**
  42  * syscon_get_regmap() - Get access to a register map
  43  *
  44  * @dev:        Device to check (UCLASS_SCON)
  45  * @info:       Returns regmap for the device
  46  * @return 0 if OK, -ve on error
  47  */
  48 struct regmap *syscon_get_regmap(struct udevice *dev);
  49
  50 /**
  51  * syscon_get_regmap_by_driver_data() - Look up a controller by its ID
  52  *
  53  * Each system controller can be accessed by its driver data, which is
  54  * assumed to be unique through the scope of all system controllers that
  55  * are in use. This function looks up the controller given this driver data.
  56  *
  57  * @driver_data:        Driver data value to look up
  58  * @devp:               Returns the controller correponding to @driver_data
  59  * @return 0 on success, -ENODEV if the ID was not found, or other -ve error
  60  *         code
  61  */
  62 int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp);
  63
  64 /**
  65  * syscon_get_regmap_by_driver_data() - Look up a controller by its ID
  66  *
  67  * Each system controller can be accessed by its driver data, which is
  68  * assumed to be unique through the scope of all system controllers that
  69  * are in use. This function looks up the regmap given this driver data.
  70  *
  71  * @driver_data:        Driver data value to look up
  72  * @return register map correponding to @driver_data, or -ve error code
  73  */
  74 struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data);
  75
  76 /**
  77  * syscon_get_first_range() - get the first memory range from a syscon regmap
  78  *
  79  * @driver_data:        Driver data value to look up
  80  * @return first region of register map correponding to @driver_data, or
  81  *                      -ve error code
  82  */
  83 void *syscon_get_first_range(ulong driver_data);
  84
  85 #endif