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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 | // SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2020 Linaro Limited. */ #define LOG_CATEGORY UCLASS_SCMI_AGENT #include <dm.h> #include <errno.h> #include <scmi_agent.h> #include <scmi_agent-uclass.h> #include <dm/devres.h> #include <dm/device_compat.h> #include <dm/device-internal.h> #include <linux/arm-smccc.h> #include <linux/compat.h> #include "smt.h" #define SMCCC_RET_NOT_SUPPORTED ((unsigned long)-1) /** * struct scmi_smccc_channel - Description of an SCMI SMCCC transport * @func_id: SMCCC function ID used by the SCMI transport * @smt: Shared memory buffer */ struct scmi_smccc_channel { ulong func_id; struct scmi_smt smt; }; /** * struct scmi_channel - Channel instance referenced in SCMI drivers * @ref: Reference to local channel instance **/ struct scmi_channel { struct scmi_smccc_channel ref; }; static int scmi_smccc_process_msg(struct udevice *dev, struct scmi_channel *channel, struct scmi_msg *msg) { struct scmi_smccc_channel *chan = &channel->ref; struct arm_smccc_res res; int ret; ret = scmi_write_msg_to_smt(dev, &chan->smt, msg); if (ret) return ret; arm_smccc_smc(chan->func_id, 0, 0, 0, 0, 0, 0, 0, &res); if (res.a0 == SMCCC_RET_NOT_SUPPORTED) ret = -ENXIO; else ret = scmi_read_resp_from_smt(dev, &chan->smt, msg); scmi_clear_smt_channel(&chan->smt); return ret; } static int setup_channel(struct udevice *dev, struct scmi_smccc_channel *chan) { u32 func_id; int ret; if (dev_read_u32(dev, "arm,smc-id", &func_id)) { dev_err(dev, "Missing property func-id\n"); return -EINVAL; } chan->func_id = func_id; ret = scmi_dt_get_smt_buffer(dev, &chan->smt); if (ret) dev_err(dev, "Failed to get smt resources: %d\n", ret); return ret; } static int scmi_smccc_get_channel(struct udevice *dev, struct udevice *protocol, struct scmi_channel **channel) { struct scmi_smccc_channel *base_chan = dev_get_plat(dev); struct scmi_smccc_channel *chan; u32 func_id; int ret; if (dev_read_u32(protocol, "arm,smc-id", &func_id)) { /* Uses agent base channel */ *channel = container_of(base_chan, struct scmi_channel, ref); return 0; } /* Setup a dedicated channel */ chan = calloc(1, sizeof(*chan)); if (!chan) return -ENOMEM; ret = setup_channel(protocol, chan); if (ret) { free(chan); return ret; } *channel = container_of(chan, struct scmi_channel, ref); return 0; } static int scmi_smccc_of_to_plat(struct udevice *dev) { struct scmi_smccc_channel *chan = dev_get_plat(dev); return setup_channel(dev, chan); } static const struct udevice_id scmi_smccc_ids[] = { { .compatible = "arm,scmi-smc" }, { } }; static const struct scmi_agent_ops scmi_smccc_ops = { .of_get_channel = scmi_smccc_get_channel, .process_msg = scmi_smccc_process_msg, }; U_BOOT_DRIVER(scmi_smccc) = { .name = "scmi-over-smccc", .id = UCLASS_SCMI_AGENT, .of_match = scmi_smccc_ids, .plat_auto = sizeof(struct scmi_smccc_channel), .of_to_plat = scmi_smccc_of_to_plat, .ops = &scmi_smccc_ops, }; |