include/syscon.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #ifndef __SYSCON_H
   8 #define __SYSCON_H
   9
  10 #include <dm/ofnode.h>
  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_regmap_lookup_by_phandle() - Look up a controller by a phandle
  78  *
  79  * This operates by looking up the given name in the device (device
  80  * tree property) of the device using the system controller.
  81  *
  82  * @dev:        Device using the system controller
  83  * @name:       Name of property referring to the system controller
  84  * @return      A pointer to the regmap if found, ERR_PTR(-ve) on error
  85  */
  86 struct regmap *syscon_regmap_lookup_by_phandle(struct udevice *dev,
  87                                                const char *name);
  88
  89 /**
  90  * syscon_get_first_range() - get the first memory range from a syscon regmap
  91  *
  92  * @driver_data:        Driver data value to look up
  93  * @return first region of register map correponding to @driver_data, or
  94  *                      -ve error code
  95  */
  96 void *syscon_get_first_range(ulong driver_data);
  97
  98 /**
  99  * syscon_node_to_regmap - get regmap from syscon
 100  *
 101  * @node:               Device node of syscon
 102  */
 103 struct regmap *syscon_node_to_regmap(ofnode node);
 104
 105 #endif