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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 | // SPDX-License-Identifier: GPL-2.0+ /* * SCMI Power domain driver * * Copyright (C) 2023 Linaro Limited * author: AKASHI Takahiro <takahiro.akashi@linaro.org> */ #include <dm.h> #include <malloc.h> #include <power-domain.h> #include <power-domain-uclass.h> #include <scmi_agent.h> #include <scmi_agent-uclass.h> #include <scmi_protocols.h> #include <dm/device_compat.h> /** * struct scmi_pwd_properties * @attributes: Power domain attributes * @name: Name of the domain */ struct scmi_pwd_properties { u32 attributes; u8 *name; /* not used now */ }; /** * struct scmi_power_domain_priv * @num_pwdoms: Number of power domains * @prop: Pointer to domain's properties * @stats_addr: Address of statistics memory region * @stats_len: Length of statistics memory region */ struct scmi_power_domain_priv { int num_pwdoms; struct scmi_pwd_properties *prop; u64 stats_addr; size_t stats_len; }; /** * async_is_supported - check asynchronous transition * @attributes: Power domain attributes * * Determine if the power transition can be done asynchronously. * * Return: true if supported, false if not */ static bool async_is_supported(u32 attributes) { if (attributes & SCMI_PWD_ATTR_PSTATE_ASYNC) return true; /* TODO: check attributes && SCMI_PWD_ATTR_PSTATE_SYNC */ return false; } /** * scmi_power_domain_on - Enable the power domain * @power_domain: Power domain * * Turn on the power domain. * * Return: 0 on success, error code on failure */ static int scmi_power_domain_on(struct power_domain *power_domain) { struct scmi_power_domain_priv *priv = dev_get_priv(power_domain->dev); u32 flags, pstate; int ret; if (power_domain->id > priv->num_pwdoms) return -EINVAL; if (async_is_supported(priv->prop[power_domain->id].attributes)) flags = SCMI_PWD_SET_FLAGS_ASYNC; else flags = 0; /* ON */ pstate = 0; ret = scmi_pwd_state_set(power_domain->dev, flags, power_domain->id, pstate); if (ret) { dev_err(power_domain->dev, "failed to set the state on (%d)\n", ret); return ret; } return 0; } /** * scmi_power_domain_off - Disable the power domain * @power_domain: Power domain * * Turn off the power domain. * * Return: 0 on success, error code on failure */ static int scmi_power_domain_off(struct power_domain *power_domain) { struct scmi_power_domain_priv *priv = dev_get_priv(power_domain->dev); u32 flags, pstate; int ret; if (power_domain->id > priv->num_pwdoms) return -EINVAL; if (async_is_supported(priv->prop[power_domain->id].attributes)) flags = SCMI_PWD_SET_FLAGS_ASYNC; else flags = 0; /* OFF */ pstate = SCMI_PWD_PSTATE_TYPE_LOST; ret = scmi_pwd_state_set(power_domain->dev, flags, power_domain->id, pstate); if (ret) { dev_err(power_domain->dev, "failed to set the state off (%d)\n", ret); return ret; } return 0; } /** * scmi_power_domain_probe - Probe the power domain * @dev: Power domain device * * Probe the power domain and initialize the properties. * * Return: 0 on success, error code on failure */ static int scmi_power_domain_probe(struct udevice *dev) { struct scmi_power_domain_priv *priv = dev_get_priv(dev); u32 version; int i, ret; ret = devm_scmi_of_get_channel(dev); if (ret) { dev_err(dev, "failed to get channel (%d)\n", ret); return ret; } ret = scmi_generic_protocol_version(dev, SCMI_PROTOCOL_ID_POWER_DOMAIN, &version); ret = scmi_pwd_protocol_attrs(dev, &priv->num_pwdoms, &priv->stats_addr, &priv->stats_len); if (ret) { dev_err(dev, "failed to get protocol attributes (%d)\n", ret); return ret; } priv->prop = calloc(sizeof(*priv->prop), priv->num_pwdoms); if (!priv->prop) return -ENOMEM; for (i = 0; i < priv->num_pwdoms; i++) { ret = scmi_pwd_attrs(dev, i, &priv->prop[i].attributes, &priv->prop[i].name); if (ret) { dev_err(dev, "failed to get attributes pwd:%d (%d)\n", i, ret); for (i--; i >= 0; i--) free(priv->prop[i].name); free(priv->prop); return ret; } } return 0; } struct power_domain_ops scmi_power_domain_ops = { .on = scmi_power_domain_on, .off = scmi_power_domain_off, }; U_BOOT_DRIVER(scmi_power_domain) = { .name = "scmi_power_domain", .id = UCLASS_POWER_DOMAIN, .ops = &scmi_power_domain_ops, .probe = scmi_power_domain_probe, .priv_auto = sizeof(struct scmi_power_domain_priv), }; static struct scmi_proto_match match[] = { { .proto_id = SCMI_PROTOCOL_ID_POWER_DOMAIN }, { /* Sentinel */ } }; U_BOOT_SCMI_PROTO_DRIVER(scmi_power_domain, match); |