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The i.MX95 System manager exports SCMI CPU protocol for linux to manage cpu cores. The driver is to use the cpu Protocol interface to start, stop a cpu cores (eg, M7). Reviewed-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Peng Fan <peng.fan@nxp.com> Message-Id: <20250408-imx-lmm-cpu-v4-6-4c5f4a456e49@nxp.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2025 NXP
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*/
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#include <linux/firmware/imx/sm.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/scmi_protocol.h>
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#include <linux/scmi_imx_protocol.h>
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static const struct scmi_imx_cpu_proto_ops *imx_cpu_ops;
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static struct scmi_protocol_handle *ph;
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int scmi_imx_cpu_reset_vector_set(u32 cpuid, u64 vector, bool start, bool boot,
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bool resume)
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{
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if (!ph)
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return -EPROBE_DEFER;
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return imx_cpu_ops->cpu_reset_vector_set(ph, cpuid, vector, start,
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boot, resume);
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}
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EXPORT_SYMBOL(scmi_imx_cpu_reset_vector_set);
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int scmi_imx_cpu_start(u32 cpuid, bool start)
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{
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if (!ph)
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return -EPROBE_DEFER;
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if (start)
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return imx_cpu_ops->cpu_start(ph, cpuid, true);
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return imx_cpu_ops->cpu_start(ph, cpuid, false);
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};
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EXPORT_SYMBOL(scmi_imx_cpu_start);
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int scmi_imx_cpu_started(u32 cpuid, bool *started)
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{
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if (!ph)
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return -EPROBE_DEFER;
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if (!started)
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return -EINVAL;
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return imx_cpu_ops->cpu_started(ph, cpuid, started);
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};
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EXPORT_SYMBOL(scmi_imx_cpu_started);
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static int scmi_imx_cpu_probe(struct scmi_device *sdev)
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{
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const struct scmi_handle *handle = sdev->handle;
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if (!handle)
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return -ENODEV;
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if (imx_cpu_ops) {
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dev_err(&sdev->dev, "sm cpu already initialized\n");
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return -EEXIST;
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}
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imx_cpu_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_IMX_CPU, &ph);
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if (IS_ERR(imx_cpu_ops))
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return PTR_ERR(imx_cpu_ops);
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return 0;
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}
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static const struct scmi_device_id scmi_id_table[] = {
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{ SCMI_PROTOCOL_IMX_CPU, "imx-cpu" },
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{ },
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};
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MODULE_DEVICE_TABLE(scmi, scmi_id_table);
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static struct scmi_driver scmi_imx_cpu_driver = {
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.name = "scmi-imx-cpu",
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.probe = scmi_imx_cpu_probe,
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.id_table = scmi_id_table,
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};
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module_scmi_driver(scmi_imx_cpu_driver);
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MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
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MODULE_DESCRIPTION("IMX SM CPU driver");
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MODULE_LICENSE("GPL");
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