LXR uboot/drivers/power/domain/power-domain-uclass.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2016, NVIDIA CORPORATION.
   4 */
   5
   6#include <common.h>
   7#include <dm.h>
   8#include <power-domain.h>
   9#include <power-domain-uclass.h>
  10#include <dm/device-internal.h>
  11
  12static inline struct power_domain_ops *power_domain_dev_ops(struct udevice *dev)
  13{
  14        return (struct power_domain_ops *)dev->driver->ops;
  15}
  16
  17static int power_domain_of_xlate_default(struct power_domain *power_domain,
  18                                         struct ofnode_phandle_args *args)
  19{
  20        debug("%s(power_domain=%p)\n", __func__, power_domain);
  21
  22        if (args->args_count != 1) {
  23                debug("Invalid args_count: %d\n", args->args_count);
  24                return -EINVAL;
  25        }
  26
  27        power_domain->id = args->args[0];
  28
  29        return 0;
  30}
  31
  32int power_domain_get_by_index(struct udevice *dev,
  33                              struct power_domain *power_domain, int index)
  34{
  35        struct ofnode_phandle_args args;
  36        int ret;
  37        struct udevice *dev_power_domain;
  38        struct power_domain_ops *ops;
  39
  40        debug("%s(dev=%p, power_domain=%p)\n", __func__, dev, power_domain);
  41
  42        ret = dev_read_phandle_with_args(dev, "power-domains",
  43                                         "#power-domain-cells", 0, index,
  44                                         &args);
  45        if (ret) {
  46                debug("%s: dev_read_phandle_with_args failed: %d\n",
  47                      __func__, ret);
  48                return ret;
  49        }
  50
  51        ret = uclass_get_device_by_ofnode(UCLASS_POWER_DOMAIN, args.node,
  52                                          &dev_power_domain);
  53        if (ret) {
  54                debug("%s: uclass_get_device_by_ofnode failed: %d\n",
  55                      __func__, ret);
  56                return ret;
  57        }
  58        ops = power_domain_dev_ops(dev_power_domain);
  59
  60        power_domain->dev = dev_power_domain;
  61        if (ops->of_xlate)
  62                ret = ops->of_xlate(power_domain, &args);
  63        else
  64                ret = power_domain_of_xlate_default(power_domain, &args);
  65        if (ret) {
  66                debug("of_xlate() failed: %d\n", ret);
  67                return ret;
  68        }
  69
  70        ret = ops->request(power_domain);
  71        if (ret) {
  72                debug("ops->request() failed: %d\n", ret);
  73                return ret;
  74        }
  75
  76        return 0;
  77}
  78
  79int power_domain_get(struct udevice *dev, struct power_domain *power_domain)
  80{
  81        return power_domain_get_by_index(dev, power_domain, 0);
  82}
  83
  84int power_domain_free(struct power_domain *power_domain)
  85{
  86        struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
  87
  88        debug("%s(power_domain=%p)\n", __func__, power_domain);
  89
  90        return ops->free(power_domain);
  91}
  92
  93int power_domain_on(struct power_domain *power_domain)
  94{
  95        struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
  96
  97        debug("%s(power_domain=%p)\n", __func__, power_domain);
  98
  99        return ops->on(power_domain);
 100}
 101
 102int power_domain_off(struct power_domain *power_domain)
 103{
 104        struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
 105
 106        debug("%s(power_domain=%p)\n", __func__, power_domain);
 107
 108        return ops->off(power_domain);
 109}
 110
 111#if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA))
 112static int dev_power_domain_ctrl(struct udevice *dev, bool on)
 113{
 114        struct power_domain pd;
 115        int i, count, ret = 0;
 116
 117        count = dev_count_phandle_with_args(dev, "power-domains",
 118                                            "#power-domain-cells");
 119        for (i = 0; i < count; i++) {
 120                ret = power_domain_get_by_index(dev, &pd, i);
 121                if (ret)
 122                        return ret;
 123                if (on)
 124                        ret = power_domain_on(&pd);
 125                else
 126                        ret = power_domain_off(&pd);
 127        }
 128
 129        /*
 130         * power_domain_get() bound the device, thus
 131         * we must remove it again to prevent unbinding
 132         * active devices (which would result in unbind
 133         * error).
 134         */
 135        if (count > 0 && !on)
 136                device_remove(pd.dev, DM_REMOVE_NORMAL);
 137
 138        return ret;
 139}
 140
 141int dev_power_domain_on(struct udevice *dev)
 142{
 143        return dev_power_domain_ctrl(dev, true);
 144}
 145
 146int dev_power_domain_off(struct udevice *dev)
 147{
 148        return dev_power_domain_ctrl(dev, false);
 149}
 150#endif
 151
 152UCLASS_DRIVER(power_domain) = {
 153        .id             = UCLASS_POWER_DOMAIN,
 154        .name           = "power_domain",
 155};
 156