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7242bbf418
The i.MX95 System manager exports SCMI LMM protocol for linux to manage Logical Machines. The driver is to use the LMM Protocol interface to boot, shutdown a LM. Reviewed-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Peng Fan <peng.fan@nxp.com> Message-Id: <20250408-imx-lmm-cpu-v4-5-4c5f4a456e49@nxp.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
91 lines
2 KiB
C
91 lines
2 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_lmm_proto_ops *imx_lmm_ops;
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static struct scmi_protocol_handle *ph;
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int scmi_imx_lmm_info(u32 lmid, struct scmi_imx_lmm_info *info)
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{
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if (!ph)
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return -EPROBE_DEFER;
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if (!info)
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return -EINVAL;
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return imx_lmm_ops->lmm_info(ph, lmid, info);
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};
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EXPORT_SYMBOL(scmi_imx_lmm_info);
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int scmi_imx_lmm_reset_vector_set(u32 lmid, u32 cpuid, u32 flags, u64 vector)
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{
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if (!ph)
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return -EPROBE_DEFER;
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return imx_lmm_ops->lmm_reset_vector_set(ph, lmid, cpuid, flags, vector);
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}
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EXPORT_SYMBOL(scmi_imx_lmm_reset_vector_set);
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int scmi_imx_lmm_operation(u32 lmid, enum scmi_imx_lmm_op op, u32 flags)
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{
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if (!ph)
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return -EPROBE_DEFER;
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switch (op) {
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case SCMI_IMX_LMM_BOOT:
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return imx_lmm_ops->lmm_power_boot(ph, lmid, true);
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case SCMI_IMX_LMM_POWER_ON:
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return imx_lmm_ops->lmm_power_boot(ph, lmid, false);
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case SCMI_IMX_LMM_SHUTDOWN:
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return imx_lmm_ops->lmm_shutdown(ph, lmid, flags);
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default:
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break;
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL(scmi_imx_lmm_operation);
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static int scmi_imx_lmm_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_lmm_ops) {
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dev_err(&sdev->dev, "lmm already initialized\n");
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return -EEXIST;
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}
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imx_lmm_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_IMX_LMM, &ph);
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if (IS_ERR(imx_lmm_ops))
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return PTR_ERR(imx_lmm_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_LMM, "imx-lmm" },
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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_lmm_driver = {
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.name = "scmi-imx-lmm",
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.probe = scmi_imx_lmm_probe,
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.id_table = scmi_id_table,
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};
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module_scmi_driver(scmi_imx_lmm_driver);
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MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
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MODULE_DESCRIPTION("IMX SM LMM driver");
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MODULE_LICENSE("GPL");
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